US3909564A - Keyboard assembly with foldable printed circuit matrix switch array, and key actuator locking slide plate - Google Patents
Keyboard assembly with foldable printed circuit matrix switch array, and key actuator locking slide plate Download PDFInfo
- Publication number
- US3909564A US3909564A US495709A US49570974A US3909564A US 3909564 A US3909564 A US 3909564A US 495709 A US495709 A US 495709A US 49570974 A US49570974 A US 49570974A US 3909564 A US3909564 A US 3909564A
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- contacts
- plate
- switch
- cable
- keyboard assembly
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/78—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites
- H01H13/807—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites characterised by the spatial arrangement of the contact sites, e.g. superimposed sites
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
- H01H13/705—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/78—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites
- H01H13/785—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites characterised by the material of the contacts, e.g. conductive polymers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/23—Construction or mounting of dials or of equivalent devices; Means for facilitating the use thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2201/00—Contacts
- H01H2201/022—Material
- H01H2201/03—Composite
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2209/00—Layers
- H01H2209/002—Materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2209/00—Layers
- H01H2209/024—Properties of the substrate
- H01H2209/026—Properties of the substrate metallic
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2223/00—Casings
- H01H2223/01—Mounting on appliance
- H01H2223/024—Screw
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2225/00—Switch site location
- H01H2225/01—Different switch sites under one actuator in same plane
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2225/00—Switch site location
- H01H2225/024—Common site to all actuators, e.g. auxiliary
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2229/00—Manufacturing
- H01H2229/038—Folding of flexible printed circuit
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2235/00—Springs
- H01H2235/022—Actuating striker
- H01H2235/024—Actuating striker formed by knee or dimple of leaf spring
Definitions
- Palmyra I-Iarold Lawrence Purdy, Hummelstown; Frank Christian Youngfleish, Harrisburg, all of Pa.
- ABSTRACT This invention provides a keyboard assembly for installation in an electronic system of the type having discrete devices such as integrated circuit chips which are electrically actuated by the manual movement of keys. More particularly, the keyboard assembly consists totally of a cover, keys, cam plate, guide plate, contact plate, contacts deposited on flat flexible cable, a spacer, a base plate, and the bolts, etc. for mounting it.
- Another object of the present invention is to provide a keyboard assembly which is virtually foolproof insofar as operative manipulation is concerned.
- FIG. 1 is an exploded view of the keyboard assembly constructed in accordance with the preferred embodiment of the present invention.
- FIG. 2 is a view showing the contacts and circuits deposited on a flat flexible cable used in the keyboard assembly of FIG. 1.
- FIGS. 3 and 4 are side sectional views of a portion of the keyboard of FIG. 1 subsequent to its assembly and illustrating a key in an unactuated condition (FIG. 3) and actuated, condition (FIG. 4).
- the lower most element in FIGS. 1, 3 and 4 is base plate on which the other elements rest.
- This plate is preferably made from steel with a chromate conversion coating.
- Base plate 10 is made with a pair of downturned tabs 14 which provide means for fastening the keyboard assembly to a telephone or other keyboard-using device (not shown) by bolts 16 one of which is shown positioned in an aperture in the one tab visible in the drawing.
- the subassembly positioned directly over the base plate consists of an end ofa strip of non-conductive flat flexible cable 18 folded back over itself. A spacer 20 is sandwiched inbetween.
- FIG. 2 the inside surface 22 of the cable 18 is displayed.
- This surface contains the circuitry for the keyboard.
- Reference numeral 24 points out the axis about which the cable is folded to provide the configuration seen in FIG. 1.
- the solid dots represent contacts 26 which are located on each side of the axis.
- the contacts are deposited on the cable via conventional methods in a symmetrical pattern such that when the cable is folded over, contacts on one side are in precise opposing registration with contacts on the other side. In some cases, one pair of opposing contacts constitute a switch while in other cases, two pair constitute one switch.
- Conductors 30 connect contacts 26 to appropriate power sources, discrete devices, etc. (none of which are shown) which perform the necessary functions characteristic of the device to which the subject keyboard assembly is attached; e.g., a telephone. Circuits are closed by bringing one or more contacts on the one inside film surface into physical contact with one or more contacts on the opposite inside film surface.
- the circles shown in FIG. 1 on cable 18 simply represent the location of some of the contacts 26 on the inside surface.
- the conductors generally consist of a deposition of a single layer of conductive material such as copper.
- the contacts preferably consist of a multilayered deposition having gold and other highly conductive metals therein.
- a preferred deposition consists of copper on the bottom, gold on top and nickel inbe tween.
- a spacer 20 is sandwiched between the folded portion of cable 18.
- This spacer is preferably made from polyester and contains a plurality of holes 28 FIGS. 3 and 4 which are in alignment with opposing contacts 26. These holes or openings allow a contact 26 to be pushed through the spacer 20 and into physical contact with an opposing contact. In the absence of a biasing force on a contact, the spacer electrically and physically isolates opposing contacts one from the other.
- a switch plate 32 positioned over the cable-spacer subassembly, contains two kinds of members having spring characteristics; three commoning members 34 seen along one side of the plate and a plurality of switch members 36 spacedthroughout the surface of the plate. While only four switch,members are shown, it is to be understood that there are as many switch members as are keys; i.e., one switch member for each key.
- the commoning members 34 consist of a strip of metal stampe out from the plate on three sides.
- the strip is bent upwardly into an L-shape to form arm 38 and elbow 39.
- the commoning members may be rotated over a short are with the point of rotation or hinge line being across the strip at its point of attachment to the plate. This hinge line is indicated generally by reference numeral 40.
- the switch members 36 are also stamped out of the contact plate and formed into limbs 41 extending obliquely upwardly. Although each member is one piece, there are three functional parts. Two fingers 42 on each member are formed and bent obliquely downwardly. The free ends of each finger, curved up slightly to form a smooth surface, engages the outside insulative surface of the underlying flexible cable 18 with the point of contact immediately overlying a contact 26. In this manner, each switch member; i.e., the two fingers, contacts two contacts 26.
- the fingers 42 are connected directly to the switch member proper 44 which moves about the hinge line located at the members point of attachment with the plate. This hinge line is indicated generally by reference numeral 46.
- An overload spring 48 extends forwardly between the two fingers and moves about a hinge line located at its attachment with the spring member proper. This hinge line is indicated generally by reference numeral 50.
- the edges of the switch plate 32 have been turned up to form vertical walls 52. These walls provide ridgity to the plate as well as providing a raised platform on which the overlying guide plate rests in the assembly.
- switch plate 32 is either pre-tinned steel or stainless steel. As is now evident, the material must be resilient and capable of having spring characteristics such that when they are moved, they tend to return to their original position.
- the overlying guide plate 54 has three long narrow slots 56 up through which the arms 38 of commoning switch members 34 project in the assembled keyboard. Interiorly, the guide plate has as many openings 58 as there are keys. These openings, being in alignment with the switch members below, receive the lower part of the keys so as to guide such in their vertical movements.
- a vertical stud 60 located at one end of the guide plate, is provided to guide and align the movement of the overlying cam plate.
- Guide plate 54 is preferably made from glass-filled VALOX, a polyester sold under that tradename by General Electric Company.
- Cam plate 62 rests on guide plate 54 and in like manner, has three long, narrow slots 64 through which arms 38 project.
- the plate further has a plurality of openings 66, these being in alignment with openings 58 and switch members 36.
- One wall of openings 66 is beveled to provide a camming surface as generally indicated by reference numeral 68.
- a stud receiving slot 70 is located on one end of the cam plate.
- cam plate 62 As with guide plate 54, the preferred material used in making cam plate 62 is glass-filled VALOX.
- Keys 62 although integral, have an upper and lower section with laterally projecting rims 74 dividing the two.
- One side wall of the lower section is provided with a beveled camming surface 76.
- the length of the lower section below the camming surface is such that when assembled, the bottom surface of the key is on the top of overload springs 48 on switch members 36.
- the length of the lower section in the direction parallel to slot 70 is less than the length of opening 66.
- the top surface of the upper section provides an area for key designation symbols.
- keys 72 are molded from acrylonitrilebutadiene-styrene resins (i.e., ABS).
- the last element of the keyboard assembly is cover plate 78.
- the plurality of openings 80 thereon are sized to receive the upper section of keys 72.
- the under surface of each opening is recessed as generally indicated by reference numeral 82, to receive rim 74 on the keys.
- Vertical walls 84, surrounding each opening 80, provide support for keys 72.
- Cover plate 78 is preferably molded from ABS.
- Each of the several elements in the keyboard assem-' bly have holes on two (cable 18) or four corners. These holes, along with suitable bolts (not shown), provide one means for securing the several elements together.
- FIG. 3 is a cross-sectional elevational view of an assembled keyboard. In addition to showing the assembly, FIG. 3 shows the keyboard in an unactuated condition.
- the film or flexible cable 18 is folded back on itself to bring contacts 26 on one surface into a direct alignment with the contacts on the now opposing surface.
- Spacer 20, of an insulating material, provides the means for separating the two. Openings 28 in the spacer are also in direct alignment with the opposing contacts.
- switch member 36 and commoning member 34 Attention is drawn to the position of switch member 36 and commoning member 34. Particularly of interest are the portions thereof which rest or bear on the upper outside surface of film 18. The members are preloaded or stressed upwardly so that the force bearing downwardly is negligible. With respect to commoning member 34, attention is also directed to the position of its arm 38 with respect to the wall defining opening 64 in cam plate 62. In this regard, attention is directed to the positioning of beveled surface 76 on key 72 and the wall defining opening 66.
- Cam plate 62 is positioned on guide plate 54 so that stud 60 bears against the front end of slot 70.
- each key 72 rests on top of a switch member 36.
- FIG. 4 illustrates the actuated condition of the assembled keyboard.
- cam plate 54 is moved forward by the camming action of the two abutting beveled surfaces 68-76.
- the forward movement pushes arm 38 of commoning members 34 forward and downward in an are so that the elbow 39 pushes down on cable 18. This pressure pushes one contact into electrical engagement with an opposing contact 26.
- the key is pushing down on a switch member 36, the point of contact therewith being the overload spring 48. Initially the entire spring member arcs downwardly, the hinge point for the movement being at hinge line 46. The downward travel is transferred through fingers 42 to cable 18 and contacts 26 positioned below the fingers. The pressure pushes the contact through an opening in spacer 20 and into physical and electrical contact with an opposing contact on the other side thereby closing a circuit.
- a keyboard assembly comprising:
- a flat flexible cable with a portion thereof folded back over on itself and having contacts deposited on both facing surfaces, contact on one surface being directly across from contacts on the other surface;
- a layer of insulating material positioned between the two contact-carrying surfaces and having holes therethrough, said holes being in registration with opposing contacts;
- a switch plate overlying the folded over cable and containing a plurality of resilient switch members comprising an elongated limb extending obliquely upwardly and a pair of fingers, one on either side of the limb, extending obliquely downwardly with the free end of each finger being adjacent an outside surface of the folded over cable and in direct alignment with a contact located on the inside surface, said plate further containing a plurality of commoning members comprising an L-shaped strip of material having a vertical arm and an elbow, said elbow being adjacent an outside surface of the folded over cable and in direct alignment with a contact located on the inside surface;
- a slidable cam plate positioned over and spaced a plurality of movable keys each having a bottom surface adjacent the free end of the limb on the switch member and a beveled surface on one side so that as one of the keys are depressed, the bottom surface thereof pushes downwardly on the limb whereby the two free ends on the fingers pushes the cable forcing the underlying aligned contacts into electrical engagement through a hole in the layer of insulating material, said beveled surface concurrently pushing on and laterally sliding the cam plate such that the arms of the commoning members extending through the slots are rotated about the point of attachment with the switch plate so that the elbows drive the underlying contacts into electrical engagement through the holes in the insulating layer.
Abstract
This invention provides a keyboard assembly for installation in an electronic system of the type having discrete devices such as integrated circuit chips which are electrically actuated by the manual movement of keys. More particularly, the keyboard assembly consists totally of a cover, keys, cam plate, guide plate, contact plate, contacts deposited on flat flexible cable, a spacer, a base plate, and the bolts, etc. for mounting it.
Description
1 1 KEYBOARD ASSEMBLY WITH FOLDABLE PRINTED CIRCUIT MATRIX SWITCH ARRAY, AND KEY ACTUATOR LOCKING SLIDE PLATE [75] Inventors: William Samuel Scheingold,
Palmyra; I-Iarold Lawrence Purdy, Hummelstown; Frank Christian Youngfleish, Harrisburg, all of Pa.
[73] Assignee: AMP Incorporated, Harrisburg, Pa.
[22] Filed: Aug. 8, 1974 [21] Appl. No.: 495,709
[52] US. Cl. 200/5 E; 200/5 A; 200/50 C;
200/159 B; 200/292; 200/325; 197/98; 317/101 F [51] Int. C13. HOIH 9/20; H01H 13/00; G06F 3/02 [581 Field of Search 200/1 R, 5, 16 A, 159 R, ZOO/159 A, 159 B, 275, 290, 50 C, 322328, 329-331, 340; 340/365 R, 365 A; 235/145 R; 179/90 K; 197/98; 317/101 F [56] References Cited UNlTED STATES PATENTS 2,969,439 l/196l Dubois 200/5 A X Primary E.\-aminer.lames R. Scott Attorney, Agent, or Firm-Allan B. Osborne, Esq.
[57] ABSTRACT This invention provides a keyboard assembly for installation in an electronic system of the type having discrete devices such as integrated circuit chips which are electrically actuated by the manual movement of keys. More particularly, the keyboard assembly consists totally of a cover, keys, cam plate, guide plate, contact plate, contacts deposited on flat flexible cable, a spacer, a base plate, and the bolts, etc. for mounting it.
1 Claim, 4 Drawing Figures U.S. Patant Sept 30,1975 Sheet 1 of 4 3,909,564
US. Patent Sept. 30,1975 Sheet 2 of4 3,909,564
US. Patent Sept. 30,1975 Sheet 3 Of4 3,909,564
US. Patent Sept. 30,1975 Sheet4 0f4 3,909,564
KEYBOARD ASSEMBLY WITH FOLDABLE PRINTED CIRCUIT MATRIX SWITCH ARRAY, AND KEY ACTUATOR LOCKING SLIDE PLATE BACKGROUND OF THE INVENTION Conventional keyboards such as found on Touch- Tone telephones contain 101 parts including mounting screws, studs and nuts. In addition to these many parts the final assembly requires the bringing together of three major subassemblies. Further, all the work in both subassembly and final assembly must be done by skilled workmen, with such work including countless soldering operations. Obviously the cost of the many parts plus skilled labor is high. Further, as is well known, humans make mistakes which lead to high failure rates of the assembled keyboards.
It is therefore an object of this invention to provide a keyboard assembly having only a few inexpensive parts. As a corollary yet distinct feature, it is an object to provide a keyboard assembly which is extremely simple to assemble and as such, is not subject to misassembly.
Another object of the present invention is to provide a keyboard assembly which is virtually foolproof insofar as operative manipulation is concerned.
It is yet another object of the present invention to provide a keyboard assembly which is exceedingly reliable in operation.
These and other objects, novel features and advan tages of the present invention will be readily apparent from the following detailed description of the preferred embodiment.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded view of the keyboard assembly constructed in accordance with the preferred embodiment of the present invention; and
FIG. 2 is a view showing the contacts and circuits deposited on a flat flexible cable used in the keyboard assembly of FIG. 1.
FIGS. 3 and 4 are side sectional views of a portion of the keyboard of FIG. 1 subsequent to its assembly and illustrating a key in an unactuated condition (FIG. 3) and actuated, condition (FIG. 4).
DESCRIPTION OF THE PREFERRED EMBODIMENT The several elements of the keyboard assembly have been exploded vertically to show the details of each element, the relationship of one element to another and also to illustrate the natural, uncomplicated method of assembling the elements to form the keyboard.
The lower most element in FIGS. 1, 3 and 4 is base plate on which the other elements rest. This plate is preferably made from steel with a chromate conversion coating.
The subassembly positioned directly over the base plate consists of an end ofa strip of non-conductive flat flexible cable 18 folded back over itself. A spacer 20 is sandwiched inbetween.
Turning now to FIG. 2, the inside surface 22 of the cable 18 is displayed. This surface contains the circuitry for the keyboard. Reference numeral 24 points out the axis about which the cable is folded to provide the configuration seen in FIG. 1. The solid dots represent contacts 26 which are located on each side of the axis. The contacts are deposited on the cable via conventional methods in a symmetrical pattern such that when the cable is folded over, contacts on one side are in precise opposing registration with contacts on the other side. In some cases, one pair of opposing contacts constitute a switch while in other cases, two pair constitute one switch.
The circles shown in FIG. 1 on cable 18 simply represent the location of some of the contacts 26 on the inside surface.
Although a number of non-conductive or insulative films are available from which flat flexible cable 18 can be made, a polyimide film sold under the trademark KAPTON by E. I. duPont de Nemours & Co. is preferred. The conductors generally consist of a deposition of a single layer of conductive material such as copper. The contacts preferably consist of a multilayered deposition having gold and other highly conductive metals therein. A preferred deposition consists of copper on the bottom, gold on top and nickel inbe tween.
Referring back to FIGS. 1, 3 and 4 and the subassembly, it was noted above that a spacer 20 is sandwiched between the folded portion of cable 18. This spacer is preferably made from polyester and contains a plurality of holes 28 FIGS. 3 and 4 which are in alignment with opposing contacts 26. These holes or openings allow a contact 26 to be pushed through the spacer 20 and into physical contact with an opposing contact. In the absence of a biasing force on a contact, the spacer electrically and physically isolates opposing contacts one from the other.
A switch plate 32, positioned over the cable-spacer subassembly, contains two kinds of members having spring characteristics; three commoning members 34 seen along one side of the plate and a plurality of switch members 36 spacedthroughout the surface of the plate. While only four switch,members are shown, it is to be understood that there are as many switch members as are keys; i.e., one switch member for each key.
The commoning members 34 consist of a strip of metal stampe out from the plate on three sides. The strip is bent upwardly into an L-shape to form arm 38 and elbow 39. The commoning members may be rotated over a short are with the point of rotation or hinge line being across the strip at its point of attachment to the plate. This hinge line is indicated generally by reference numeral 40.
The switch members 36 are also stamped out of the contact plate and formed into limbs 41 extending obliquely upwardly. Although each member is one piece, there are three functional parts. Two fingers 42 on each member are formed and bent obliquely downwardly. The free ends of each finger, curved up slightly to form a smooth surface, engages the outside insulative surface of the underlying flexible cable 18 with the point of contact immediately overlying a contact 26. In this manner, each switch member; i.e., the two fingers, contacts two contacts 26.
The fingers 42 are connected directly to the switch member proper 44 which moves about the hinge line located at the members point of attachment with the plate. This hinge line is indicated generally by reference numeral 46.
An overload spring 48 extends forwardly between the two fingers and moves about a hinge line located at its attachment with the spring member proper. This hinge line is indicated generally by reference numeral 50.
The edges of the switch plate 32 have been turned up to form vertical walls 52. These walls provide ridgity to the plate as well as providing a raised platform on which the overlying guide plate rests in the assembly.
The material preferably used in making switch plate 32 is either pre-tinned steel or stainless steel. As is now evident, the material must be resilient and capable of having spring characteristics such that when they are moved, they tend to return to their original position.
The overlying guide plate 54 has three long narrow slots 56 up through which the arms 38 of commoning switch members 34 project in the assembled keyboard. Interiorly, the guide plate has as many openings 58 as there are keys. These openings, being in alignment with the switch members below, receive the lower part of the keys so as to guide such in their vertical movements. A vertical stud 60, located at one end of the guide plate, is provided to guide and align the movement of the overlying cam plate.
A stud receiving slot 70 is located on one end of the cam plate.
As with guide plate 54, the preferred material used in making cam plate 62 is glass-filled VALOX.
The top surface of the upper section provides an area for key designation symbols.
Preferably keys 72 are molded from acrylonitrilebutadiene-styrene resins (i.e., ABS).
The last element of the keyboard assembly is cover plate 78. The plurality of openings 80 thereon are sized to receive the upper section of keys 72. The under surface of each opening is recessed as generally indicated by reference numeral 82, to receive rim 74 on the keys. Vertical walls 84, surrounding each opening 80, provide support for keys 72. Cover plate 78 is preferably molded from ABS.
Each of the several elements in the keyboard assem-' bly have holes on two (cable 18) or four corners. These holes, along with suitable bolts (not shown), provide one means for securing the several elements together.
The assembly step of the keyboard illustrated in FIG. 1 simply requires stacking the several elements in the order shown and securing such together. FIG. 3 is a cross-sectional elevational view of an assembled keyboard. In addition to showing the assembly, FIG. 3 shows the keyboard in an unactuated condition.
As indicated above, the film or flexible cable 18 is folded back on itself to bring contacts 26 on one surface into a direct alignment with the contacts on the now opposing surface. Spacer 20, of an insulating material, provides the means for separating the two. Openings 28 in the spacer are also in direct alignment with the opposing contacts.
Attention is drawn to the position of switch member 36 and commoning member 34. Particularly of interest are the portions thereof which rest or bear on the upper outside surface of film 18. The members are preloaded or stressed upwardly so that the force bearing downwardly is negligible. With respect to commoning member 34, attention is also directed to the position of its arm 38 with respect to the wall defining opening 64 in cam plate 62. In this regard, attention is directed to the positioning of beveled surface 76 on key 72 and the wall defining opening 66.
As noted above, the bottom surface of each key 72 rests on top of a switch member 36.
FIG. 4 illustrates the actuated condition of the assembled keyboard.
ln depressing a key 72, cam plate 54 is moved forward by the camming action of the two abutting beveled surfaces 68-76. The forward movement pushes arm 38 of commoning members 34 forward and downward in an are so that the elbow 39 pushes down on cable 18. This pressure pushes one contact into electrical engagement with an opposing contact 26.
Concurrently, the key is pushing down on a switch member 36, the point of contact therewith being the overload spring 48. Initially the entire spring member arcs downwardly, the hinge point for the movement being at hinge line 46. The downward travel is transferred through fingers 42 to cable 18 and contacts 26 positioned below the fingers. The pressure pushes the contact through an opening in spacer 20 and into physical and electrical contact with an opposing contact on the other side thereby closing a circuit.
Additional downward pressure on key 72 is taken up by the overlaod spring 48 bending at hinge line 50. This prevents overflexing of cable 18.
When pressure is released from a key, the resiliency of the switch member restores it to its normal position and the reactive force exerted by arm 38 of commoning switch 34 returns cam plate 62 to its initial position.
The foregoing detailed description has been given for clearness of understanding only, and no unnecessary limitations should be understood therefrom, as some modifications will be obvious to those skilled in the art.
What is claimed is:
l. A keyboard assembly comprising:
a. a flat flexible cable with a portion thereof folded back over on itself and having contacts deposited on both facing surfaces, contact on one surface being directly across from contacts on the other surface;
b. means for connecting the contacts into electrical circuits;
c. a layer of insulating material positioned between the two contact-carrying surfaces and having holes therethrough, said holes being in registration with opposing contacts;
d. a switch plate overlying the folded over cable and containing a plurality of resilient switch members comprising an elongated limb extending obliquely upwardly and a pair of fingers, one on either side of the limb, extending obliquely downwardly with the free end of each finger being adjacent an outside surface of the folded over cable and in direct alignment with a contact located on the inside surface, said plate further containing a plurality of commoning members comprising an L-shaped strip of material having a vertical arm and an elbow, said elbow being adjacent an outside surface of the folded over cable and in direct alignment with a contact located on the inside surface;
. a slidable cam plate positioned over and spaced a plurality of movable keys each having a bottom surface adjacent the free end of the limb on the switch member and a beveled surface on one side so that as one of the keys are depressed, the bottom surface thereof pushes downwardly on the limb whereby the two free ends on the fingers pushes the cable forcing the underlying aligned contacts into electrical engagement through a hole in the layer of insulating material, said beveled surface concurrently pushing on and laterally sliding the cam plate such that the arms of the commoning members extending through the slots are rotated about the point of attachment with the switch plate so that the elbows drive the underlying contacts into electrical engagement through the holes in the insulating layer.
Claims (1)
1. A keyboard assembly comprising: a. a flat flexible cable with a portion thereof folded back over on itself and having contacts deposited on both facing surfaces, contact on one surface being directly across from contacts on the other surface; b. means for connecting the contacts into electrical circuits; c. a layer of insulating material positioned between the two contact-carrying surfaces and having holes therethrough, said holes being in registration with opposing contacts; d. a switch plate overlying the folded over cable and containing a plurality of resilient switch members comprising an elongated limb extending obliquely upwardly and a pair of fingers, one on either side of the limb, extending obliquely downwardly with the free end of each finger being adjacent an outside surface of the folded over cable and in direct alignment with a contact located on the inside surface, said plate further containing a plurality of commoning members comprising an L-shaped strip of material having a vertical arm and an elbow, said elbow being adjacent an outside surface of the folded over cable and in direct alignment with a contact located on the inside surface; e. a slidable cam plate positioned over and spaced from the switch plate, said cam plate having a plurality of slots into which the vertical arms extend and a plurality of openings in alignment with each of the switch members; f. a plurality of movable keys each having a bottom surface adjacent the free end of the limb on the switch member anD a beveled surface on one side so that as one of the keys are depressed, the bottom surface thereof pushes downwardly on the limb whereby the two free ends on the fingers pushes the cable forcing the underlying aligned contacts into electrical engagement through a hole in the layer of insulating material, said beveled surface concurrently pushing on and laterally sliding the cam plate such that the arms of the commoning members extending through the slots are rotated about the point of attachment with the switch plate so that the elbows drive the underlying contacts into electrical engagement through the holes in the insulating layer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US495709A US3909564A (en) | 1974-08-08 | 1974-08-08 | Keyboard assembly with foldable printed circuit matrix switch array, and key actuator locking slide plate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US495709A US3909564A (en) | 1974-08-08 | 1974-08-08 | Keyboard assembly with foldable printed circuit matrix switch array, and key actuator locking slide plate |
Publications (1)
Publication Number | Publication Date |
---|---|
US3909564A true US3909564A (en) | 1975-09-30 |
Family
ID=23969703
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US495709A Expired - Lifetime US3909564A (en) | 1974-08-08 | 1974-08-08 | Keyboard assembly with foldable printed circuit matrix switch array, and key actuator locking slide plate |
Country Status (1)
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US (1) | US3909564A (en) |
Cited By (55)
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US3982081A (en) * | 1974-09-04 | 1976-09-21 | Amp Incorporated | Keyboard assembly with overlapped flexible printed circuit cable switch |
US3999025A (en) * | 1975-07-30 | 1976-12-21 | Burroughs Corporation | Low profile tactile feedback keyboard switch assembly |
US4028509A (en) * | 1975-08-29 | 1977-06-07 | Hughes Aircraft Company | Simplified tabulator keyboard assembly for use in watch/calculator having transparent foldable flexible printed circuit board with contacts and actuator indicia |
US4051337A (en) * | 1976-01-27 | 1977-09-27 | Cavitron Corporation | Dental handpiece switch |
US4063054A (en) * | 1974-11-22 | 1977-12-13 | Canon Kabushiki Kaisha | Key switch |
US4066851A (en) * | 1975-10-30 | 1978-01-03 | Chomerics, Inc. | Keyboard switch assembly having foldable printed circuit board, integral spacer and preformed depression-type alignment fold |
US4099037A (en) * | 1976-06-21 | 1978-07-04 | National Semiconductor Corporation | Key board switch assembly having canti-levered leaf spring contact assembly on common conductive frame |
US4145584A (en) * | 1976-04-28 | 1979-03-20 | Otterlei Jon L | Flexible keyboard switch with integral spacer protrusions |
US4192976A (en) * | 1978-12-29 | 1980-03-11 | Gte Automatic Electric Laboratories Incorporated | Pushbutton call transmitter |
WO1980001219A1 (en) * | 1978-11-29 | 1980-06-12 | Serras Paulet Edouard | Push button or keyboard with depressable keys |
US4228330A (en) * | 1978-07-10 | 1980-10-14 | Litton Systems, Inc. | Touch panel mechanism |
US4297542A (en) * | 1979-12-19 | 1981-10-27 | Shumway Anthony G | Folded circuit switch apparatus having multiple contacts |
US4316066A (en) * | 1979-09-10 | 1982-02-16 | International Telephone And Telegraph Corporation | Key switch with snap-action contact and resilient actuator |
US4322588A (en) * | 1980-04-04 | 1982-03-30 | Umc Industries, Inc. | Slide selector switch device |
US4323740A (en) * | 1980-02-04 | 1982-04-06 | Rogers Corporation | Keyboard actuator device and keyboard incorporating the device |
US4324956A (en) * | 1979-05-24 | 1982-04-13 | Omron Tateisi Electronics Co. | Fluid-proof slide switch |
DE3145130A1 (en) * | 1980-11-21 | 1982-06-16 | The Keyboard Comp., Garden Grove, Calif. | CONTACT CONTROL DEVICE |
US4342883A (en) * | 1979-08-22 | 1982-08-03 | Northern Telecom, Inc. | Pushbutton switch assemblies for telephone sets |
US4365536A (en) * | 1980-10-27 | 1982-12-28 | Whirlpool Corporation | Sliding actuator membrane switch for organ keyboard |
US4370533A (en) * | 1979-12-10 | 1983-01-25 | Fujitsu Limited | Keyboard switch and process for production thereof |
EP0087369A1 (en) * | 1982-02-24 | 1983-08-31 | Digital Equipment Corporation | Improved electronic keyboard |
EP0099427A1 (en) * | 1980-09-24 | 1984-02-01 | Engineering Research Applications, Inc. | Keyboard |
US4447681A (en) * | 1983-02-22 | 1984-05-08 | Amp Incorporated | Switch key assembly having improved switch actuation |
US4492838A (en) * | 1983-02-24 | 1985-01-08 | Amp Incorporated | Key switch having an actuator integral with the return spring |
EP0157035A2 (en) * | 1984-03-29 | 1985-10-09 | Cherry Electrical Products Limited | Mechanical keyboard with membrane switch array |
US4621373A (en) * | 1984-03-13 | 1986-11-04 | General Electric Company | Control surface for a trunking personal radio |
USRE32419E (en) * | 1981-03-16 | 1987-05-12 | Engineering Research Applications, Inc. | Molded keyboard and method of fabricating same |
US4686499A (en) * | 1984-09-28 | 1987-08-11 | Cincinnati Microwave, Inc. | Police radar warning receiver with cantilevered PC board structure |
WO1987007759A1 (en) * | 1986-06-02 | 1987-12-17 | Bebié + Co. | Keyboard for use in difficult conditions |
US4818828A (en) * | 1988-06-17 | 1989-04-04 | Smith Corona Corporation | Electronic keyboard |
US4874913A (en) * | 1987-04-30 | 1989-10-17 | Oki Electric Industry Co., Ltd. | Luminous element holding structure for an illuminated key switch |
US4877347A (en) * | 1987-07-09 | 1989-10-31 | Ta Triumph-Adler Aktiengesellschaft | Keyboard for typewriters or similar machines |
US4942276A (en) * | 1988-04-11 | 1990-07-17 | Futaba Denshi Kogyo Kabushiki Kaisha | Clicked key board switch |
US4952762A (en) * | 1988-04-08 | 1990-08-28 | Futaba Denshi Kogyo Kabushiki Kaisha | Keyboard switch |
US4972051A (en) * | 1989-08-07 | 1990-11-20 | General Electric Company | Switch for two-way hand-held transceiver |
US4977298A (en) * | 1989-09-08 | 1990-12-11 | Matsushita Electric Industrial Co., Ltd. | Panel switch |
US5075524A (en) * | 1989-08-30 | 1991-12-24 | Stocko Metallwarenfabriken Henkels Und Sohn Gmbh & Co. | Electric pushbutton switch |
US5121091A (en) * | 1989-09-08 | 1992-06-09 | Matsushita Electric Industrial Co., Ltd. | Panel switch |
US5152230A (en) * | 1983-06-20 | 1992-10-06 | Yaffa Licari | Joining means for securing articles together |
US5388922A (en) * | 1993-07-23 | 1995-02-14 | Smith Corona Corporation | Miniature keyboard |
US5422447A (en) * | 1992-09-01 | 1995-06-06 | Key Tronic Corporation | Keyboard with full-travel, self-leveling keyswitches and return mechanism keyswitch |
US5562203A (en) * | 1994-10-20 | 1996-10-08 | Brother Kogyo Kabushiki Kaisha | Keyswitch |
US20020025837A1 (en) * | 2000-05-22 | 2002-02-28 | Levy David H. | Input devices and their use |
EP1316980A1 (en) * | 2003-02-14 | 2003-06-04 | Phonak Ag | Actuator or switch for miniature device |
US20030160712A1 (en) * | 2002-02-27 | 2003-08-28 | Digit Wireless, Llc, A Delaware Corporation | Keypad construction |
US20030173201A1 (en) * | 2002-03-15 | 2003-09-18 | Brother Kogyo Kabushiki Kaisha | Membrane switch, key switch using membrane switch, keyboard having key switches, and personal computer having keyboard |
US20040031673A1 (en) * | 2002-05-23 | 2004-02-19 | Levy David H. | Keypads and key switches |
US6781077B2 (en) | 2000-12-14 | 2004-08-24 | Think Outside, Inc. | Keyswitch and actuator structure |
US20040256203A1 (en) * | 2003-06-13 | 2004-12-23 | Pekka Pihlaja | Keyboard and a method for manufacturing it |
US20070057030A1 (en) * | 2005-09-14 | 2007-03-15 | Ladouceur Norman M | Input apparatus for a handheld electronic device and method of enabling input employing the same |
US20080237013A1 (en) * | 2007-03-29 | 2008-10-02 | Matsushita Electric Industrial Co., Ltd. | Electronic equipment |
CN101909095A (en) * | 2009-06-05 | 2010-12-08 | 深圳富泰宏精密工业有限公司 | Portable electronic device |
US8362373B2 (en) * | 2010-03-15 | 2013-01-29 | Apple Inc. | Keys with double-diving-board spring mechanisms |
CN103745857A (en) * | 2013-12-24 | 2014-04-23 | 洪贵顺 | Keyboard lever and mechanical lever-type METAL DOME ultrathin keyboard |
US20160293355A1 (en) * | 2015-03-31 | 2016-10-06 | Brother Kogyo Kabushiki Kaisha | Key Input Device, Method of Manufacturing the Same, and Image Recording Apparatus |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2969439A (en) * | 1956-10-22 | 1961-01-24 | Svenska Relafabriken Abn Ab | Electric switching device |
US3125895A (en) * | 1964-03-24 | Switch interlock and lockout unit | ||
US3207862A (en) * | 1963-01-18 | 1965-09-21 | Standard Systems Corp | Push-button selector switch with latch plate means |
US3383487A (en) * | 1966-07-18 | 1968-05-14 | Wiener Robert | Thin flexible magnetic switch |
US3472974A (en) * | 1967-09-25 | 1969-10-14 | Automatic Elect Lab | Pushbutton switch activated by a slide with a plurality of toggle joints and cams |
US3519766A (en) * | 1968-02-23 | 1970-07-07 | Rca Corp | Pushbutton mechanism |
US3742157A (en) * | 1969-09-25 | 1973-06-26 | Lematex Inc | Keyboard switch assembly with improved movable contact |
US3745288A (en) * | 1972-08-07 | 1973-07-10 | Gte Automatic Electric Lab Inc | Flexible printed wiring switch |
US3800104A (en) * | 1972-11-13 | 1974-03-26 | Becton Dickinson Co | Low profile keyboard switch assembly with snap action cantilever contact |
-
1974
- 1974-08-08 US US495709A patent/US3909564A/en not_active Expired - Lifetime
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3125895A (en) * | 1964-03-24 | Switch interlock and lockout unit | ||
US2969439A (en) * | 1956-10-22 | 1961-01-24 | Svenska Relafabriken Abn Ab | Electric switching device |
US3207862A (en) * | 1963-01-18 | 1965-09-21 | Standard Systems Corp | Push-button selector switch with latch plate means |
US3383487A (en) * | 1966-07-18 | 1968-05-14 | Wiener Robert | Thin flexible magnetic switch |
US3472974A (en) * | 1967-09-25 | 1969-10-14 | Automatic Elect Lab | Pushbutton switch activated by a slide with a plurality of toggle joints and cams |
US3519766A (en) * | 1968-02-23 | 1970-07-07 | Rca Corp | Pushbutton mechanism |
US3742157A (en) * | 1969-09-25 | 1973-06-26 | Lematex Inc | Keyboard switch assembly with improved movable contact |
US3745288A (en) * | 1972-08-07 | 1973-07-10 | Gte Automatic Electric Lab Inc | Flexible printed wiring switch |
US3800104A (en) * | 1972-11-13 | 1974-03-26 | Becton Dickinson Co | Low profile keyboard switch assembly with snap action cantilever contact |
Cited By (79)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3982081A (en) * | 1974-09-04 | 1976-09-21 | Amp Incorporated | Keyboard assembly with overlapped flexible printed circuit cable switch |
US4063054A (en) * | 1974-11-22 | 1977-12-13 | Canon Kabushiki Kaisha | Key switch |
US3999025A (en) * | 1975-07-30 | 1976-12-21 | Burroughs Corporation | Low profile tactile feedback keyboard switch assembly |
US4028509A (en) * | 1975-08-29 | 1977-06-07 | Hughes Aircraft Company | Simplified tabulator keyboard assembly for use in watch/calculator having transparent foldable flexible printed circuit board with contacts and actuator indicia |
US4066851A (en) * | 1975-10-30 | 1978-01-03 | Chomerics, Inc. | Keyboard switch assembly having foldable printed circuit board, integral spacer and preformed depression-type alignment fold |
US4051337A (en) * | 1976-01-27 | 1977-09-27 | Cavitron Corporation | Dental handpiece switch |
US4145584A (en) * | 1976-04-28 | 1979-03-20 | Otterlei Jon L | Flexible keyboard switch with integral spacer protrusions |
US4099037A (en) * | 1976-06-21 | 1978-07-04 | National Semiconductor Corporation | Key board switch assembly having canti-levered leaf spring contact assembly on common conductive frame |
US4228330A (en) * | 1978-07-10 | 1980-10-14 | Litton Systems, Inc. | Touch panel mechanism |
FR2443129A1 (en) * | 1978-11-29 | 1980-06-27 | Serras Paulet Edouard | ELECTRICAL OR ELECTRONIC SWITCHING DEVICE FORMING PUSH BUTTON OR KEYBOARD WITH SOCKET KEYS |
WO1980001219A1 (en) * | 1978-11-29 | 1980-06-12 | Serras Paulet Edouard | Push button or keyboard with depressable keys |
US4192976A (en) * | 1978-12-29 | 1980-03-11 | Gte Automatic Electric Laboratories Incorporated | Pushbutton call transmitter |
US4324956A (en) * | 1979-05-24 | 1982-04-13 | Omron Tateisi Electronics Co. | Fluid-proof slide switch |
US4342883A (en) * | 1979-08-22 | 1982-08-03 | Northern Telecom, Inc. | Pushbutton switch assemblies for telephone sets |
US4316066A (en) * | 1979-09-10 | 1982-02-16 | International Telephone And Telegraph Corporation | Key switch with snap-action contact and resilient actuator |
US4370533A (en) * | 1979-12-10 | 1983-01-25 | Fujitsu Limited | Keyboard switch and process for production thereof |
US4297542A (en) * | 1979-12-19 | 1981-10-27 | Shumway Anthony G | Folded circuit switch apparatus having multiple contacts |
US4323740A (en) * | 1980-02-04 | 1982-04-06 | Rogers Corporation | Keyboard actuator device and keyboard incorporating the device |
US4322588A (en) * | 1980-04-04 | 1982-03-30 | Umc Industries, Inc. | Slide selector switch device |
EP0099427A1 (en) * | 1980-09-24 | 1984-02-01 | Engineering Research Applications, Inc. | Keyboard |
US4365536A (en) * | 1980-10-27 | 1982-12-28 | Whirlpool Corporation | Sliding actuator membrane switch for organ keyboard |
US4341934A (en) * | 1980-11-21 | 1982-07-27 | The Keyboard Company | Actuator for keyboard switches |
DE3145130A1 (en) * | 1980-11-21 | 1982-06-16 | The Keyboard Comp., Garden Grove, Calif. | CONTACT CONTROL DEVICE |
USRE32419E (en) * | 1981-03-16 | 1987-05-12 | Engineering Research Applications, Inc. | Molded keyboard and method of fabricating same |
AU584303B2 (en) * | 1982-02-24 | 1989-05-18 | Digital Equipment Corporation | Electronic keyboard |
EP0087369A1 (en) * | 1982-02-24 | 1983-08-31 | Digital Equipment Corporation | Improved electronic keyboard |
US4467150A (en) * | 1982-02-24 | 1984-08-21 | Digital Equipment Corporation | Electronic keyboard |
US4447681A (en) * | 1983-02-22 | 1984-05-08 | Amp Incorporated | Switch key assembly having improved switch actuation |
US4492838A (en) * | 1983-02-24 | 1985-01-08 | Amp Incorporated | Key switch having an actuator integral with the return spring |
US5152230A (en) * | 1983-06-20 | 1992-10-06 | Yaffa Licari | Joining means for securing articles together |
US4621373A (en) * | 1984-03-13 | 1986-11-04 | General Electric Company | Control surface for a trunking personal radio |
EP0157035A3 (en) * | 1984-03-29 | 1987-03-18 | Cherry Electrical Products Limited | Mechanical keyboard with membrane switch arrray |
EP0157035A2 (en) * | 1984-03-29 | 1985-10-09 | Cherry Electrical Products Limited | Mechanical keyboard with membrane switch array |
US4686499A (en) * | 1984-09-28 | 1987-08-11 | Cincinnati Microwave, Inc. | Police radar warning receiver with cantilevered PC board structure |
WO1987007759A1 (en) * | 1986-06-02 | 1987-12-17 | Bebié + Co. | Keyboard for use in difficult conditions |
US4874913A (en) * | 1987-04-30 | 1989-10-17 | Oki Electric Industry Co., Ltd. | Luminous element holding structure for an illuminated key switch |
US4877347A (en) * | 1987-07-09 | 1989-10-31 | Ta Triumph-Adler Aktiengesellschaft | Keyboard for typewriters or similar machines |
US4952762A (en) * | 1988-04-08 | 1990-08-28 | Futaba Denshi Kogyo Kabushiki Kaisha | Keyboard switch |
US4942276A (en) * | 1988-04-11 | 1990-07-17 | Futaba Denshi Kogyo Kabushiki Kaisha | Clicked key board switch |
US4818828A (en) * | 1988-06-17 | 1989-04-04 | Smith Corona Corporation | Electronic keyboard |
US4972051A (en) * | 1989-08-07 | 1990-11-20 | General Electric Company | Switch for two-way hand-held transceiver |
US5075524A (en) * | 1989-08-30 | 1991-12-24 | Stocko Metallwarenfabriken Henkels Und Sohn Gmbh & Co. | Electric pushbutton switch |
US4977298A (en) * | 1989-09-08 | 1990-12-11 | Matsushita Electric Industrial Co., Ltd. | Panel switch |
US5121091A (en) * | 1989-09-08 | 1992-06-09 | Matsushita Electric Industrial Co., Ltd. | Panel switch |
US5422447A (en) * | 1992-09-01 | 1995-06-06 | Key Tronic Corporation | Keyboard with full-travel, self-leveling keyswitches and return mechanism keyswitch |
US5388922A (en) * | 1993-07-23 | 1995-02-14 | Smith Corona Corporation | Miniature keyboard |
WO1995028727A1 (en) * | 1994-04-14 | 1995-10-26 | Key Tronic Corporation | Improved keyboard with full-travel, self-leveling keyswitches and return mechanism keyswitch |
US5562203A (en) * | 1994-10-20 | 1996-10-08 | Brother Kogyo Kabushiki Kaisha | Keyswitch |
US8094806B2 (en) | 2000-05-22 | 2012-01-10 | Nuance Communications, Inc. | Input devices and their use |
US20070256915A1 (en) * | 2000-05-22 | 2007-11-08 | Digit Wireless, Inc. | Input Devices And Their Use |
US20020025837A1 (en) * | 2000-05-22 | 2002-02-28 | Levy David H. | Input devices and their use |
US7391861B2 (en) | 2000-05-22 | 2008-06-24 | Digit Wireless, Llc | Input devices and their use |
US6781077B2 (en) | 2000-12-14 | 2004-08-24 | Think Outside, Inc. | Keyswitch and actuator structure |
US20030160712A1 (en) * | 2002-02-27 | 2003-08-28 | Digit Wireless, Llc, A Delaware Corporation | Keypad construction |
US7126498B2 (en) | 2002-02-27 | 2006-10-24 | Digit Wireless, Llc | Keypad construction |
US20030173201A1 (en) * | 2002-03-15 | 2003-09-18 | Brother Kogyo Kabushiki Kaisha | Membrane switch, key switch using membrane switch, keyboard having key switches, and personal computer having keyboard |
US6797906B2 (en) * | 2002-03-15 | 2004-09-28 | Brother Kogyo Kabushiki Kaisha | Membrane switch, key switch using membrane switch, keyboard having key switches, and personal computer having keyboard |
US20040031673A1 (en) * | 2002-05-23 | 2004-02-19 | Levy David H. | Keypads and key switches |
US6911608B2 (en) | 2002-05-23 | 2005-06-28 | Digit Wireless, Llc | Keypads and key switches |
EP1316980A1 (en) * | 2003-02-14 | 2003-06-04 | Phonak Ag | Actuator or switch for miniature device |
US7005588B2 (en) * | 2003-06-13 | 2006-02-28 | Nokia Corporation | Keyboard and a method for manufacturing it |
US20040256203A1 (en) * | 2003-06-13 | 2004-12-23 | Pekka Pihlaja | Keyboard and a method for manufacturing it |
US20070057030A1 (en) * | 2005-09-14 | 2007-03-15 | Ladouceur Norman M | Input apparatus for a handheld electronic device and method of enabling input employing the same |
US8319734B2 (en) | 2005-09-14 | 2012-11-27 | Research In Motion Limited | Input apparatus for a handheld electronic device and method of enabling input employing the same |
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US20080237013A1 (en) * | 2007-03-29 | 2008-10-02 | Matsushita Electric Industrial Co., Ltd. | Electronic equipment |
US7851718B2 (en) * | 2007-03-29 | 2010-12-14 | Panasonic Corporation | Electronic equipment |
US7989716B2 (en) * | 2009-06-05 | 2011-08-02 | Foxconn Communication Technology Corp. | Keypad assembly and electronic device using same |
US20100307904A1 (en) * | 2009-06-05 | 2010-12-09 | Foxconn Communication Technology Corp. | Keypad assembly and electronic device using same |
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