US3806673A - Pushbutton keyboard switch assembly with improved disc spring contact and printed circuit structure - Google Patents
Pushbutton keyboard switch assembly with improved disc spring contact and printed circuit structure Download PDFInfo
- Publication number
- US3806673A US3806673A US00308205A US30820572A US3806673A US 3806673 A US3806673 A US 3806673A US 00308205 A US00308205 A US 00308205A US 30820572 A US30820572 A US 30820572A US 3806673 A US3806673 A US 3806673A
- Authority
- US
- United States
- Prior art keywords
- pad
- pads
- button
- actuating element
- keyboard system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000002093 peripheral effect Effects 0.000 claims abstract description 13
- 239000004020 conductor Substances 0.000 claims description 20
- 238000004891 communication Methods 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 9
- 239000011435 rock Substances 0.000 claims description 5
- 230000007246 mechanism Effects 0.000 claims description 4
- 210000003414 extremity Anatomy 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 241000136406 Comones Species 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H15/00—Switches having rectilinearly-movable operating part or parts adapted for actuation in opposite directions, e.g. slide switch
- H01H15/02—Details
- H01H15/06—Movable parts; Contacts mounted thereon
- H01H15/16—Driving mechanisms
-
- 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
- H01H13/02—Details
- H01H13/12—Movable parts; Contacts mounted thereon
- H01H13/14—Operating parts, e.g. push-button
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06C—DIGITAL COMPUTERS IN WHICH ALL THE COMPUTATION IS EFFECTED MECHANICALLY
- G06C7/00—Input mechanisms
- G06C7/02—Keyboards
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/0202—Constructional details or processes of manufacture of the input device
-
- 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
- H01H13/7006—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 comprising a separate movable contact element for each switch site, all other elements being integrated in layers
-
- 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
- H01H13/7013—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 in which the movable contacts of each switch site or of a row of switch sites are formed in a single plate
Definitions
- a keyboard system particularly useful when a low protile is desirable as in miniature hand held calculators comprises an electrically insulative circuit board on which a plurality of sets of electrically conductive pads are arranged on one surface thereof. Aligned with each set is an actuating element and actuating button. The actuating element is supported on its peripheral edge on at least one pad of a set and upon actuation comes into bridging electrical contact with one or more pole pads of the set which are arranged near the peripheral edge of the actuating element.
- pads are in electrical connection with electrical circuitry arranged on the reverse side of the board.
- an electrical jumper is provided so that two circuits may cross one another while being maintained electrically separated from one another.
- a sliding button switch is employed for indefinite actuation of an on-off or a constant switch.
- the present invention relates generally to keyboard systems and more particularly is directed to an improved push-button keyboard system for establishing electrical connections in response to actuation.
- keyboard systems In recent years numerous types of keyboard systems have been developed for use in transmitting coded electrical information in various types of machines. Typically such keyboard systems utilize pushbutton members appropriately symbolized in a manner indicative of a numeric, alphabetic or mathematic function generated in response to depression of the pushbutton member to establish electrical connection between various conductive paths and various circuit elements coupled to the system in order to achieve a desired func-' tion.
- the cost of associated equipment has decreased dramatically in recent years coupled with an increase in the use and availability of various devices incorporating such systems the need has arisen for extremely inexpensive readily manufactured keyboard systems which may be economically and accurately produced on'a mass production basis with a high degree of accurate repeatability. For example, the need of miniaturized electronic-calculators,
- a plurality of spaced sets of conductive members including U and rivet shaped are arranged at a surface of a support in electrical communication with conductive paths on an opposite surface of the support.
- a plurality of actuatable conductive elements, one for each set of conductive members, are provided to establish bridging electrical connection between conductive members of a set application of a preselected deflecting force to the conductive elements. While this structure is very effective for many applications it is not readily adaptable to a two pole design which is required for binary encoding or for touch tone telephones, or in general to more complex circuitry.
- a plurality of discontinuous annular electrically conductive support pads are arranged on a surface of a support each supporting an actuatable conductive element in the form of a disc.
- a disc retainer maintains the discs in the desired location on the support pads.
- a plurality of electrically conductive pads are located within the annular pad adjacent to the discontinued portion.
- Each of the conductive pads are electrically connected to conductive paths on the reverse side of the support so that upon predetermined deflection of the discs bridging electrical connection is effected between the pads.
- the discs are deflected by respective push buttons which are slidable in a direction perpendicular to the plane upon which the discs are sup ported.
- a disc is deflected by a button which is slidable in a direction parallel to the plane upon which the disc is supported which motion is translated to a perpendicular direction.
- This button has an at rest position in both the actuated and nonactuated positions.
- FIG. 1 is a perspective view ofa miniature hand held calculator incorporating the keyboard system of the invention
- FIG. 2 is a'perspective view of the keyboard system used in the FIG. 1 calculator, the keyboard partly broken away to show the interrelationship of several of the component parts including an actuating element and electrically conductive pads;
- FIG. 3 is an enlarged blow apart perspective view of an alternative set of electrically conductive pads with a retainer for the actuating elements partly broken away; I I
- FIG. 4 is a cross section taken on lines 4-4 of FIG.
- FIG. 5 is a bottom plan view of a circuit board useful in the calculator of FIG. 1,.the actuating elements for each station appearing in dashed lines;
- FIG. 6 is a top plan view of a portion of a modified form of the circuit board
- FIG. 7 is a top plan view similar to FIG. 6 of a portion of another modified form of the circuit board
- FIG. 8 is a cross section taken on lines 7--7 of FIG. 2 showing a slide switch for extended actuation in the unactuated state;
- FIG. 9 is the same view as FIG. 8 but showing the slide switch in the actuated state
- FIG. 10 is a cross sectional view of the slide button of the FIGS. 8 and 9 switch
- FIG. 11 is a bottom view of the FIG. 10 slide button
- FIG. 12 is a front view of the slide switch support shown in FIGS. 8 and 9;
- FIG.13 is a bottom view of the support of FIG. 12.
- FIG. 14 is a perspective view of a keyboard system useful in telephone dialing incorporating the instant invention.
- FIG. 15 is a bottom plan view of a circuit board useful in the keyboard system of FIG. 14, the actuating elements for each station appearing in dashed lines;
- FIGS. 16 and 17 are top plan views of keyboard systems similar to that of the system shown in FIG. 14 but having modified keyboard arrangements.
- FIG. 1 indicates generally a miniature, hand held calculator which includes a digitial read out section 12 and a keyboard system 14.
- the keyboard system 14 is shown in FIG. 2 partly broken away and comprises escutcheon l6 mounting a plurality of manually depressable pushbutton members 18 on which are arranged characters symbolic of the operation effected by their actuation. It will be noted that the pushbutton members are provided with a shoulder 20 to limit outward movement. Aligned with each pushbutton 18 is an actuating element 22 and aligned with each actuating element is a set 24 of electrically conductive pads mounted on circuit board 26. Actuating elements are maintained in their proper location by means of retainer 28 preferably of a suitable electrically insulative material.
- a layer 30 of flexible material, such as polyethylene terephthalate is preferably placed over retainerv 28 to seal each of the electrically conductive pad sets 24..Escutcheon 16 is spaced by any suitable means from layer 30'to permit movement of button 18 from an unactuated to an actuated position.
- FIG. 5 illustrates electrically conductive circuitry 50 of the reverse side of circuit board 26 to which the conductive pads are electrically connected as explained below.
- FIGS. 3 and 4 for details of an exemplary actuating station including a set of electrically conductive pads.
- set 24' of FIGS. 3 and 4 is a modified version of that shown in FIG. 2, two pole pads being shown rather than the single'pole pad of FIG. 2.
- Circuit board 26 is composed of an electrically insulative material such as epoxy bonded glass cloth and may have a thickness of approximately 1/32 of an inch.
- An additional insulative support member 32 (shown only in FIGS. 3 and 4) may be provided beneath circuit board 26 if it is desirable to provide more rigidity and support for the associated electronic components, power supplies, display means and the like.
- Circuit board 26 has two generally parallel opposite planar surfaces 34, 36 with a plurality of sets of conductive pads 24 arranged on surface 34. As shown in FIGS. 3 and 4 a set 24f comprises a discontinuous annular or crescent shaped pad 38. Are shaped pad portion 41 is aligned with the imaginary continuation of pad 38 but is separated therefrom. Aperture 40 extends through circuit board 26 as does conductive pad 38 which is'electrically connected to a portion of electrically conductive circuit 50 on surface 36 of board 26. Pad 41 is not connected to'circuit 50 but is used for support of the actuating element. Located adjacent pads 38 and 41 spaced slightly radially inwardly v therefrom are pole pads 42, 44.
- Pads 42, 44 are aligned with respective apertures 46, 48 and extend through circuit board 26 from surface 34 to other portions of circuit 50 on surface 36.
- actuating element 22 which may take the form of a disc having a non-developable surface to render it snap acting. That is upon depression of element 22 from that configuration shown in FIGS. 3 and 4, convex surface facing upwardly, force increases with distance travelled for a first distance which is followed by a second distance when force decreases with distance travelled. This negatively sloped portion of the force versus distance curve is referred to as the snap portion. In order for this to occur the central portion of the disc must travel beyond the plane on which the periphery of the disc rests.
- pads 38'and 41 extend above the surface 34 a sufficient distance to permit snap action of disc 22.
- a disc which has been found to be satisfactory I is a stainless steel disc 0.5 of an inch in diameter and the pads extend approximately 0.004 inches above surface 34.
- the height of pole pads 42, 44 is chosen to be approximately the same as that of pads 38, 41.
- Disc 22 is preferably gold plated on the bottom (as seen inFIG. 3) peripheral margin 23 forming a conductive berm.
- the peripheral edge of the disc 22 rests upon common pad 38 and arc shaped pad 41. As seen in FIG. 4 the edge is supported sufficiently above surface 34 of circuit board 26 so that any tendency of the disc to work its way beneath retainer 28 is avoided.
- Retainer 28 is chosen having a thickness appreciably more than the distance pads 38 and 41 extend above surface 34 to allow sufficient space to receive disc 22.
- Fle'xible sheet 30 is placed over the disc andis adhesively attached to retainer 28 to seal the sets of conductive pads from gross contaminants such as dust, dirt and even liquids.
- Spring 52 may be used to transmit force from the button to disc 22 and is captured in cavity 54 of button 18. Upon deflection of disc 22 to and beyond its over center position and the disc makes bridging electrical contact between common pad 38 and pole pads 42, 44 through berm 23. Pole pads are positioned so that disc 22 does not come into electrical contact therewith when the disc is in the unactuated state but does come into contact therewith with the disc 22 is in the actuated state.
- pole pads thus are located near enough to the outer periphery of the disc when the disc is seated on common pad 38 to permit electrical contact with thedisc in only the actuated state of the 'disc 'yet far enough away from the center of the disc to permit the disc to snap through center. It has been found that for satisfactory feel" the pole pad must be located so that no portion of it is closer to the center of the disc than half the discs radius. For optimum feel" the pole pad must be positioned closely adjacent the outer periphery of the disc. For 0.5 inch diameter discs these pads are located so that the pad center is approximately 0.200 inches from, the center of the disc.
- FIG. 15 illustrates electrically conductive circuitry 50 of a circuit board 26 in which the sets of conductive pads utilize the double pole pad embodiment of FIGS. 3 and 4. It will be understood that the particular number of actuating stations is one of choice determined by the desired design parameters of the unit into which the keyboard is used. It will be seen that depression of any disc 22, shown in phantom in FIG. 15, causes bridging electrical connection with two separate circuits.
- a particular board made in accordance with this invention is preferably constructed by starting with electrically insulative board 26 having a layer of copper of two ounces per square foot on both sides 34 and 36. Therequired number of apertures are then formed as by drilling and another layer of copper of one ounce per square foot is added to both surfaces, as by plating. This results in a height of approximately 0.004 inches above the surface of the original substrate. A mask is then placed over the board and the copper is etched away from the board except for the desired configuration. Electrical connection is effected to those portions which are designed to carry current and a thin layer of oxidation resistant metal such as gold may be deposited thereon. This includes pads 38, 42, and 44 and circuitry 50.
- FIG. 6 shows a second embodiment with an alternative set'24" of conductive pads.
- Common pad 38 and aperture 40 are the same as in FIGS. 3 and 4 as are pole pad 42 and aperture 46. However, in this embodiment two separated are shaped pads 60 and 62 are located on the imaginary continuation of pad 38' and spaced therefrom.
- a jumper pad 64 is provided extending from apertures 66, 68, aperture 66 being adjacent and intermediate pads 60 and 62 while aperture 68 is adjacent and intermediate pads 62 and 38. As in the case of pad 42, the jumper pad 64 and apertures 66 and 68 are located slightly radially inwardly from pad 38 and the imaginary continuation thereof.
- circuit 72 located on surface 36 of board 26 extends to aperture 68, across jumper 64 on surface'34 of board 26, back to circuit 72 on surface 36. Passing beneath jumper 64 on side 36 is circuit 74 electrically separated from circuit 72.
- I pad set 24" comprises common pad 38' which is similar to common pad 38 of FIG. 6, aperture 40 corresponding to aperture 40 of pole pad 38, but with an additional aperture 43 so that circuits 70 and 71 can cross each other while being maintained electrically separated from one another.
- circuit 70 on surface 36 leads to aperture 40, across a portion of pad 38' on surface 34 to aperture 43 and then back to circuit 70 on surface 36 so that circuit 79 passes beneath in electrical separation from that portion of pad 38' forming part of circuit 70.
- pad 75 which is located on the imaginary continuation of crescent shaped common pad 38.
- Aperture 77 is provided in pad electrically connecting pad 75 to circuit 79 on surface 36 of board 26.
- Pads 83 and are provided spaced radially inwardly of the imaginary continuation of crescent shaped common pad 38 and are in electrical connection with circuit 73 through respective plated apertures 81, 87.
- pad set 24" comprises a double throw switch with pad 75, normally closed being bridged with comon pad 38 when the disc 22 is in the unactuated position.
- a light spring load caused by spring 52 helps to insure that this electrical connection is maintained when the disc is unactuated. Actuation of the disc will cause bridging of normally open pads 83, 85 with common pad 38 and separation of common pad 38' and pad 75. This switch may be useful for instance to shift from one memory to another.
- Slide switch 80 is shown which is adapted for extended or indefinite actuation.
- the switch- has two positions of rest, the actuated and the unactuated.
- Slide switch 80 comprises slide button 82 which slides parallel to the top surface of escutcheon 16.
- Button 82 is formed with two tabs 84 which extend transversely therefrom and which are captured beneath the escutcheon 16 to prevent button 82 from becoming dislodged.
- a knurled or serrated surface 86 may be provided on button 82 to facilitate actuation thereof.
- a protuberance 88 is formed on the bottom wall of the button and serves as a first spring seat. Protuberance 88 is formed near one end of the button for a purpose which will become obvious below.
- slide switch support 90 which is generally T shaped having a cross arm 92 which-fits into a mating opening in escutcheon l6 and prevents support 90 from moving laterally.
- the main body portion 96 is adapted to fit within a channel 98 formed in button 82 thereby permitting relative sliding movement of button 82 and support 90.
- protuberance 100 Located near the end of body 96 remote from the cross bar 92 is protuberance 100 which serves as a second spring seat.
- Coil spring. 102 extends between the first and second spring seats. It will be seen that in the position of FIG. 8 in which the spring is in an at rest position essentially no force is exerted by spring 102. As the button is moved from the FIG. 8 to the FIG.
- Protuberances 88, 100 are virtually aligned in this position with the axial centerline of the spring slightly over centered so that the moment of force parallel to the surface of the escutcheon is opposite to the button return direction so that button 82 remains in the actuated state until a sliding force is exerted against it to return it to the unactuated position. That is, as button 82 moves to the actuated position spring 102 reaches its maximum compression before reaching the position shown in FIG. 9. In the unactuated position the return force of disc 22 is sufficient to cause support 90 to return to its FIG. 8 position. Thus by means of coil spring 102 a horizontal motion is translated into a vertical force with spring 102 rocking back and forth within the confines of the cavities formed between button 82 and support 90.
- FIG. 14 shows a keyboard system 110 including a plurality of keys 18' especially useful in telephone dialing apparatus.
- the circuit board shown in FIG. 15 may be used in the system of FIG. 14 and comprises a two pole arrangement as shown in FIGS. 3 and 4.
- FIGS. 16 and 17 show variations 112, 114 employing different keyboard arrangements, all of which are made in accordance with the invention.
- a keyboard system comprising an electrically insulative substrate having generally planar opposed first and second surfaces, a plurality of sets of pads arranged on one of the first and second surfaces, an actuating element having a first at rest convex configuration and a second actuated concave configuration and having an outer peripheral margin circumscribed by an outer peripheral edge, a said element aligned with each set, an actuating button aligned with each actuating element and movable from an actuated to an unactuated position and back, each set of pads including a first crescent shaped pad of electrically conductive material having a top surface elevated above said one of the first and second surfaces, a second pad located radially inwardly of the first crescent shaped pad and radially outwardly from the center of said first crescent shaped pad and aligned with the actuating element so that bridging electrical connection is made between the pads upon actuation through contact with the outer peripheral margin of the element.
- a keyboard system in which the second pad has a top surface generally in the same plane as the top surface of the first pad.
- a keyboard system including electrical circuitry arranged on the other of said first and second surfaces and an aperture is formed through the board in alignment with each of the first and second pads on the said one surface and with a portion of the electrical circuitry on the said other surface, electrically conductive material located on the walls defining the apertures in electrical communication with respective pads and portions of electrical circuitry.
- each set of pads includes a third are shaped pad located on the imaginary continuation of the crescent shaped pad and spaced from said pad, the are shaped pad having a top surface generally in the same plane as that of the top surface of the crescent shaped pad.
- a keyboard system in which the second pad is intermediate the first and third pads adjacent one end of the crescent shaped pad and including a fourth pad intermediate the first and third pads adjacent another end of the crescent shaped pad but spaced therefrom and located slightly radially inwardly of the crescent shaped pad, an aperture through the substrate aligned with the fourth pad on said one surface and a portion of the circuitry on said second surface and electrically conductive material located on the wall of the aperture in electrical communication with the fourth pad and portion of the electrical circuitry.
- each set of pads includes a fourth pad located on the imaginary continuation of the crescent shaped pad and spaced from the third pad and said crescent shaped pad, the second pad is intermediate the first and third pads adjacent one end of the crescent shaped pad and including fifth and sixth pads located slightly radially inwardly of the first crescent shaped pad and adjacent opposite ends of said fourth pad and spaced therefrom, a respective aperture aligned with the fifth and sixth pads on said one surface and a portion of the electrical circuitry on the said second surface, electrically conductive material located on the walls defining the apertures in electrical communication with the respective fifth and sixth pads and portions of electrical circuitry, the fifth and sixth pads being joined electrically on the said first surface so that two portions of electrical circuitry can cross each other while being maintained electrically separated from one another.
- a keyboard system comprising an electrically insulative substrate having first and second planar, parallel surfaces,
- electrical circuiry' including a plurality of circuits arranged on the second surface aligned with the apertures
- a generally circular shaped actuating element having an electrically conductive berm along its outer periphery aligned with each set and movable into and out of bridging electrical connection with the common and the pole pad through its berm.
- a keyboard system in which two pole pads are provided in each set.
- one pad comprises two jumper apertures and an electrically conductive jumper arranged on the first surface extending from an electric circuit on the second surface through one jumper aperture along the first surface, through the second jumper aperture back to said electric circuit thereby forming a discontinuous portion of the said electric circuit on the second surface allowing another circuit to cross the said electric circuit on the second surface while being maintained electrically separated therefrom.
- a keyboard system in which 0.050 inches in diameter, the center line located 0.200 inches from the center of the annular pad, the pads having a top surface approximately 0.004 inches above the first surface, the top surface of the annular pad being approximately 0.025 inches in width, at least 0.025 inches of clearance provided between any two pads, and the actuating element is a snap acting disc measuring approximately 0.500 inches in diameter.
- a keyboard system further including an escutcheon for movably mounting buttons, a button mounted in the escutcheon for and in alignment with each set movable to an actuating and a non-actuating position, at least one of the buttons being slidable between first and second extremities on the escutcheon, a rockable support pivotably mounted on said escutcheon and disposed beneath the slidable button, a first spring seat formed in a bottom surface of the slidable button, a second spring seat formed in a top surface of the rockable support, a coil spring received between the first and second spring seat, the coil spring exerting a downward force on the rockable support causing it to rock with an end thereof moving toward the set in an actuating direction when the slidable button is at one extremity, the coil spring exerting no significant downward force on the rockable support when the slidable button is at the other extremity.
- An actuating mechanism having two stable at rest positions in the actuated and the non-actuated states comprising a support, a button slidable on the support between two extremities, a first spring seat formed in a bottom surface of the button, a rockable member pivotably mounted on said support and located beneath the button, a second spring seat formed on a surface of the member in facing relation with the bottom surface of the button, a spring received on and extending between the first and second spring seats, a switch including an actuating element adapted to close an electrical circuit upon actuation, the actuating element aligned with a portion of the rockable member, when the button is at one extremity the spring applies a downward force on the member causing it to rock and actuate the actuating element, when the button is at the other extremity the spring exerting insufficient downward force 16.
- An actuating element in which a channel is formed along a longitudinal axis of the sliding button, the channel in communication with the bottom wall of the sliding button, the main body portion of the rockable member received in the channel capturing the spring between the button and the rockable member.
- An actuating element according to claim 16 including two tabs laterally extending from the sliding button, the tabs received beneaththe support to prevent movement of the sliding button away from the support.
- a keyboard system in which at least one double throwswitch is provided by further including in at least one setof pads another pad of electrically conductive material on said one surface aligned with one of said apertures, the conductive material extending from the said another pad through its respective aperture to the electrical circuitry, the and another pad is located on the imaginary continuation of the discontinuous crescent pad but spaced therefrom, and means providing a slight bias against the actuating element against the set of pads so that bridging electrical connection is effected between the crescent pad and the said another pad through the actuating element when unactuated, and when the actuating element is actuated bridging electrical connection is effected between the crescent pad and the second pad.
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Push-Button Switches (AREA)
- Input From Keyboards Or The Like (AREA)
- Switches With Compound Operations (AREA)
- Switch Cases, Indication, And Locking (AREA)
Priority Applications (13)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE795425D BE795425A (fr) | 1972-11-20 | Systeme perfectionne de clavier a boutons-poussoirs | |
US00308205A US3806673A (en) | 1972-11-20 | 1972-11-20 | Pushbutton keyboard switch assembly with improved disc spring contact and printed circuit structure |
GB6005072A GB1411589A (en) | 1972-11-20 | 1972-12-29 | Pushbutton keyboard system |
GB3913374A GB1411590A (en) | 1972-11-20 | 1972-12-29 | Actuating mechanism for an electric switch |
CA160,363A CA981733A (en) | 1972-11-20 | 1973-01-02 | Pushbutton keyboard system |
KR7300209A KR780000687B1 (en) | 1972-11-20 | 1973-02-03 | Pushbutton keyboard system |
DD168762A DD112532A5 (zh) | 1972-11-20 | 1973-02-08 | |
DE2306268A DE2306268A1 (de) | 1972-11-20 | 1973-02-08 | Tastatur |
IT48220/73A IT977322B (it) | 1972-11-20 | 1973-02-13 | Perfezionamento nelle tastiere in particolare per calcolatrici elettroniche |
BR731255A BR7301255D0 (pt) | 1972-11-20 | 1973-02-20 | Conjunto de teclado e mecanismo de atuacao |
JP2364373A JPS5718647B2 (zh) | 1972-11-20 | 1973-02-27 | |
NLAANVRAGE7302687,A NL171754C (nl) | 1972-11-20 | 1973-02-27 | Druktoetsenbordsamenstel. |
FR7313233A FR2207349B1 (zh) | 1972-11-20 | 1973-04-12 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00308205A US3806673A (en) | 1972-11-20 | 1972-11-20 | Pushbutton keyboard switch assembly with improved disc spring contact and printed circuit structure |
Publications (1)
Publication Number | Publication Date |
---|---|
US3806673A true US3806673A (en) | 1974-04-23 |
Family
ID=23193000
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00308205A Expired - Lifetime US3806673A (en) | 1972-11-20 | 1972-11-20 | Pushbutton keyboard switch assembly with improved disc spring contact and printed circuit structure |
Country Status (12)
Country | Link |
---|---|
US (1) | US3806673A (zh) |
JP (1) | JPS5718647B2 (zh) |
KR (1) | KR780000687B1 (zh) |
BE (1) | BE795425A (zh) |
BR (1) | BR7301255D0 (zh) |
CA (1) | CA981733A (zh) |
DD (1) | DD112532A5 (zh) |
DE (1) | DE2306268A1 (zh) |
FR (1) | FR2207349B1 (zh) |
GB (2) | GB1411589A (zh) |
IT (1) | IT977322B (zh) |
NL (1) | NL171754C (zh) |
Cited By (39)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3908109A (en) * | 1974-06-14 | 1975-09-23 | Mohawk Data Sciences Corp | Dome shaped switch member |
US3973091A (en) * | 1975-02-03 | 1976-08-03 | Texas Instruments Incorporated | Pushbutton keyboard assembly having pole and inner contacts simultaneously engaged by a bridging contact |
US3988551A (en) * | 1975-04-03 | 1976-10-26 | Magic Dot, Inc. | Membrane keyboard apparatus having common apertured electrode, aperture inserted electrodes and conductive bubble contactors |
US3995128A (en) * | 1975-01-10 | 1976-11-30 | Texas Instruments Incorporated | Pushbutton keyboard system having preformed recessed support with contacts mounted on face and in recesses |
US3995126A (en) * | 1975-04-03 | 1976-11-30 | Magic Dot, Inc. | Membrane keyboard apparatus |
US3996428A (en) * | 1975-03-17 | 1976-12-07 | Litronix, Inc. | Pushbutton keyboard assembly with over center diaphragm contact |
US3996430A (en) * | 1974-05-07 | 1976-12-07 | Preh Elektrofeinmechanische Werke | Keyboard switch assembly having multilayer printed circuit structure |
US4005296A (en) * | 1974-10-29 | 1977-01-25 | Medtronic, Inc. | Disc switch |
US4018999A (en) * | 1974-09-12 | 1977-04-19 | Mohawk Data Sciences Corporation | Keyboard switch assembly having adhesive position retainer element |
US4046981A (en) * | 1975-12-24 | 1977-09-06 | Texas Instruments Incorporated | Keyboard switch with printed wiring board structure and its method of manufacture |
US4068369A (en) * | 1975-01-10 | 1978-01-17 | Texas Instruments Incorporated | Method of making pushbutton keyboard system |
US4071718A (en) * | 1976-10-22 | 1978-01-31 | Bowmar Instrument Corporation | Flat keyboard assembly having cover type membrane with protrusions to align switch components |
US4074088A (en) * | 1974-05-21 | 1978-02-14 | Texas Instruments Incorporated | Keyboard apparatus and method of making |
US4085306A (en) * | 1977-06-09 | 1978-04-18 | Kb-Denver, Inc. | Keyboard switch assemblies |
US4127752A (en) * | 1977-10-13 | 1978-11-28 | Sheldahl, Inc. | Tactile touch switch panel |
US4153987A (en) * | 1974-12-09 | 1979-05-15 | Texas Instruments Incorporated | Method for assembling keyboard |
US4254309A (en) * | 1978-12-18 | 1981-03-03 | Texas Instruments Incorporated | Snap-through characteristic keyboard switch |
US4319099A (en) * | 1979-05-03 | 1982-03-09 | Atari, Inc. | Dome switch having contacts offering extended wear |
US4324956A (en) * | 1979-05-24 | 1982-04-13 | Omron Tateisi Electronics Co. | Fluid-proof slide switch |
USRE30923E (en) * | 1973-01-02 | 1982-05-04 | Bowmar Instrument Corporation | Calculator keyboard switch with disc spring contact and printed circuit board |
US4375017A (en) * | 1976-12-06 | 1983-02-22 | Rca Corporation | Calculator type keyboard including printed circuit board contacts and method of forming |
US4468542A (en) * | 1983-05-16 | 1984-08-28 | Kb Denver, Inc. | Keyboard assembly |
US4476355A (en) * | 1981-11-09 | 1984-10-09 | Grayhill, Inc. | Keyboard assembly |
US4501937A (en) * | 1983-03-14 | 1985-02-26 | Eaton Corporation | Integral multiswitch display panel |
US4529848A (en) * | 1981-11-05 | 1985-07-16 | Cherry Electrical Products Corporation | Switch with conical spring actuator |
US4703139A (en) * | 1983-09-06 | 1987-10-27 | Kb Denver, Inc. | Method in a snap dome switch keyboard assembly for reducing contact bounce time |
US4794215A (en) * | 1984-09-29 | 1988-12-27 | Matsushita Electric Industrial Co., Ltd. | Push switch sealed against contaminants |
US4978818A (en) * | 1989-04-10 | 1990-12-18 | Sulzer Brothers Limited | Key for a circuit board |
US5193669A (en) * | 1990-02-28 | 1993-03-16 | Lucas Industries, Inc. | Switch assembly |
US5214256A (en) * | 1991-02-27 | 1993-05-25 | Ralph Ipcinski | Membrane type switch with improved elastomeric actuator including a cap mounted in an actuator depression |
CN1101053C (zh) * | 1997-05-26 | 2003-02-05 | 株式会社百利达 | 一种开关的结构 |
US20040031673A1 (en) * | 2002-05-23 | 2004-02-19 | Levy David H. | Keypads and key switches |
US6730869B2 (en) * | 2001-10-31 | 2004-05-04 | Mitsumi Electric Co., Ltd. | Switch |
US20070062152A1 (en) * | 2005-09-12 | 2007-03-22 | Nokia Corporation | Domesheet assembly in a keyboard |
US20080122661A1 (en) * | 2006-11-27 | 2008-05-29 | Samsung Electronics Co., Ltd. | Touch sensor |
US20120008294A1 (en) * | 2010-07-08 | 2012-01-12 | Jahan Minoo | Printed circuit boards with embedded components |
US8879272B2 (en) | 2009-03-09 | 2014-11-04 | Apple Inc. | Multi-part substrate assemblies for low profile portable electronic devices |
US20160058514A1 (en) * | 2013-03-29 | 2016-03-03 | Olympus Corporation | Master-slave system |
US9627159B2 (en) * | 2014-10-21 | 2017-04-18 | Motorola Solutions, Inc. | Method and apparatus for providing slide actuation on a device |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5253279A (en) * | 1975-10-27 | 1977-04-28 | Sharp Kk | Key switch |
JPS5824347Y2 (ja) * | 1976-09-10 | 1983-05-25 | アルプス電気株式会社 | 押釦スイツチ |
JPS5354385U (zh) * | 1976-10-12 | 1978-05-10 | ||
JPS5735139Y2 (zh) * | 1977-10-28 | 1982-08-04 | ||
JPS5735140Y2 (zh) * | 1977-10-28 | 1982-08-04 | ||
DE2755861C2 (de) * | 1977-12-15 | 1982-10-07 | Daut & Rietz KG Fabrik für Elektrofeinmechanik GmbH & Co, 8500 Nürnberg | Tipptastatur |
DE2848588C2 (de) * | 1978-11-09 | 1982-09-09 | Daut & Rietz KG Fabrik für Elektrofeinmechanik GmbH & Co, 8500 Nürnberg | Tipptaste |
DE2902353C2 (de) * | 1979-01-22 | 1984-08-30 | Telefunken electronic GmbH, 7100 Heilbronn | Tastenfeld mit mehreren Tastschaltern |
FR2503446B1 (fr) * | 1981-04-02 | 1984-05-25 | Secme | Commutateur miniature notamment pour circuit imprime |
US4400596A (en) * | 1982-01-15 | 1983-08-23 | Amp Incorporated | Membrane switch with sequentially closable contacts |
US4430531A (en) * | 1982-03-15 | 1984-02-07 | Hewlett-Packard Company | Snap disc keyboard |
DE3518835A1 (de) * | 1985-05-24 | 1986-11-27 | Wilhelm Ruf KG, 8000 München | Schaltungsanordnung mit einem integrierten schaltkreis, der mehrere auswaehlbare funktionsgruppen enthaelt, insbesondere fernbediensender |
CN111316392B (zh) * | 2017-10-30 | 2022-02-22 | 阿尔卑斯阿尔派株式会社 | 按压开关 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2262777A (en) * | 1940-09-21 | 1941-11-18 | John M Roper | Quick acting positive contact switch |
US2441924A (en) * | 1946-04-30 | 1948-05-18 | Allied Control Co | Snap switch |
US3242298A (en) * | 1962-09-17 | 1966-03-22 | Cutler Hammer Inc | Mounting means for operator of electric switch |
US3600528A (en) * | 1969-09-25 | 1971-08-17 | Lematex Corp | Multiple switch construction |
US3684842A (en) * | 1970-07-01 | 1972-08-15 | Texas Instruments Inc | Pushbutton keyboard switch assembly with improved over center diaphragm contact |
US3707609A (en) * | 1971-10-27 | 1972-12-26 | Texas Instruments Inc | Diaphragm pushbutton switch array for keyboards |
US3749859A (en) * | 1972-04-19 | 1973-07-31 | Colorado Instr Inc | Keyboard switch assembly with improved hermetically sealed diaphragm contact structure |
US3751612A (en) * | 1971-08-30 | 1973-08-07 | Colorado Instr Inc | Snap action capacitive type switch |
-
0
- BE BE795425D patent/BE795425A/xx unknown
-
1972
- 1972-11-20 US US00308205A patent/US3806673A/en not_active Expired - Lifetime
- 1972-12-29 GB GB6005072A patent/GB1411589A/en not_active Expired
- 1972-12-29 GB GB3913374A patent/GB1411590A/en not_active Expired
-
1973
- 1973-01-02 CA CA160,363A patent/CA981733A/en not_active Expired
- 1973-02-03 KR KR7300209A patent/KR780000687B1/ko active
- 1973-02-08 DE DE2306268A patent/DE2306268A1/de active Pending
- 1973-02-08 DD DD168762A patent/DD112532A5/xx unknown
- 1973-02-13 IT IT48220/73A patent/IT977322B/it active
- 1973-02-20 BR BR731255A patent/BR7301255D0/pt unknown
- 1973-02-27 NL NLAANVRAGE7302687,A patent/NL171754C/xx not_active IP Right Cessation
- 1973-02-27 JP JP2364373A patent/JPS5718647B2/ja not_active Expired
- 1973-04-12 FR FR7313233A patent/FR2207349B1/fr not_active Expired
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2262777A (en) * | 1940-09-21 | 1941-11-18 | John M Roper | Quick acting positive contact switch |
US2441924A (en) * | 1946-04-30 | 1948-05-18 | Allied Control Co | Snap switch |
US3242298A (en) * | 1962-09-17 | 1966-03-22 | Cutler Hammer Inc | Mounting means for operator of electric switch |
US3600528A (en) * | 1969-09-25 | 1971-08-17 | Lematex Corp | Multiple switch construction |
US3684842A (en) * | 1970-07-01 | 1972-08-15 | Texas Instruments Inc | Pushbutton keyboard switch assembly with improved over center diaphragm contact |
US3751612A (en) * | 1971-08-30 | 1973-08-07 | Colorado Instr Inc | Snap action capacitive type switch |
US3707609A (en) * | 1971-10-27 | 1972-12-26 | Texas Instruments Inc | Diaphragm pushbutton switch array for keyboards |
US3749859A (en) * | 1972-04-19 | 1973-07-31 | Colorado Instr Inc | Keyboard switch assembly with improved hermetically sealed diaphragm contact structure |
Cited By (47)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE30923E (en) * | 1973-01-02 | 1982-05-04 | Bowmar Instrument Corporation | Calculator keyboard switch with disc spring contact and printed circuit board |
US3996430A (en) * | 1974-05-07 | 1976-12-07 | Preh Elektrofeinmechanische Werke | Keyboard switch assembly having multilayer printed circuit structure |
US4074088A (en) * | 1974-05-21 | 1978-02-14 | Texas Instruments Incorporated | Keyboard apparatus and method of making |
US4125934A (en) * | 1974-05-21 | 1978-11-21 | Texas Instruments Incorporated | Keyboard apparatus and method of making |
US3908109A (en) * | 1974-06-14 | 1975-09-23 | Mohawk Data Sciences Corp | Dome shaped switch member |
US4018999A (en) * | 1974-09-12 | 1977-04-19 | Mohawk Data Sciences Corporation | Keyboard switch assembly having adhesive position retainer element |
US4005296A (en) * | 1974-10-29 | 1977-01-25 | Medtronic, Inc. | Disc switch |
US4153987A (en) * | 1974-12-09 | 1979-05-15 | Texas Instruments Incorporated | Method for assembling keyboard |
US4068369A (en) * | 1975-01-10 | 1978-01-17 | Texas Instruments Incorporated | Method of making pushbutton keyboard system |
US3995128A (en) * | 1975-01-10 | 1976-11-30 | Texas Instruments Incorporated | Pushbutton keyboard system having preformed recessed support with contacts mounted on face and in recesses |
US3973091A (en) * | 1975-02-03 | 1976-08-03 | Texas Instruments Incorporated | Pushbutton keyboard assembly having pole and inner contacts simultaneously engaged by a bridging contact |
US3996428A (en) * | 1975-03-17 | 1976-12-07 | Litronix, Inc. | Pushbutton keyboard assembly with over center diaphragm contact |
US3995126A (en) * | 1975-04-03 | 1976-11-30 | Magic Dot, Inc. | Membrane keyboard apparatus |
US3988551A (en) * | 1975-04-03 | 1976-10-26 | Magic Dot, Inc. | Membrane keyboard apparatus having common apertured electrode, aperture inserted electrodes and conductive bubble contactors |
US4046981A (en) * | 1975-12-24 | 1977-09-06 | Texas Instruments Incorporated | Keyboard switch with printed wiring board structure and its method of manufacture |
US4071718A (en) * | 1976-10-22 | 1978-01-31 | Bowmar Instrument Corporation | Flat keyboard assembly having cover type membrane with protrusions to align switch components |
US4375017A (en) * | 1976-12-06 | 1983-02-22 | Rca Corporation | Calculator type keyboard including printed circuit board contacts and method of forming |
US4085306A (en) * | 1977-06-09 | 1978-04-18 | Kb-Denver, Inc. | Keyboard switch assemblies |
US4127752A (en) * | 1977-10-13 | 1978-11-28 | Sheldahl, Inc. | Tactile touch switch panel |
US4254309A (en) * | 1978-12-18 | 1981-03-03 | Texas Instruments Incorporated | Snap-through characteristic keyboard switch |
US4319099A (en) * | 1979-05-03 | 1982-03-09 | Atari, Inc. | Dome switch having contacts offering extended wear |
US4324956A (en) * | 1979-05-24 | 1982-04-13 | Omron Tateisi Electronics Co. | Fluid-proof slide switch |
US4529848A (en) * | 1981-11-05 | 1985-07-16 | Cherry Electrical Products Corporation | Switch with conical spring actuator |
US4476355A (en) * | 1981-11-09 | 1984-10-09 | Grayhill, Inc. | Keyboard assembly |
US4501937A (en) * | 1983-03-14 | 1985-02-26 | Eaton Corporation | Integral multiswitch display panel |
US4468542A (en) * | 1983-05-16 | 1984-08-28 | Kb Denver, Inc. | Keyboard assembly |
US4703139A (en) * | 1983-09-06 | 1987-10-27 | Kb Denver, Inc. | Method in a snap dome switch keyboard assembly for reducing contact bounce time |
US4794215A (en) * | 1984-09-29 | 1988-12-27 | Matsushita Electric Industrial Co., Ltd. | Push switch sealed against contaminants |
US4978818A (en) * | 1989-04-10 | 1990-12-18 | Sulzer Brothers Limited | Key for a circuit board |
US5193669A (en) * | 1990-02-28 | 1993-03-16 | Lucas Industries, Inc. | Switch assembly |
US5214256A (en) * | 1991-02-27 | 1993-05-25 | Ralph Ipcinski | Membrane type switch with improved elastomeric actuator including a cap mounted in an actuator depression |
CN1101053C (zh) * | 1997-05-26 | 2003-02-05 | 株式会社百利达 | 一种开关的结构 |
US6730869B2 (en) * | 2001-10-31 | 2004-05-04 | Mitsumi Electric Co., Ltd. | Switch |
US20060076219A1 (en) * | 2002-05-23 | 2006-04-13 | Digit Wireless, Llc, A Massachusetts Corporation | Keypads and key switches |
US20050139457A1 (en) * | 2002-05-23 | 2005-06-30 | Levy David H. | Keypads and key switches |
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 |
US20070062152A1 (en) * | 2005-09-12 | 2007-03-22 | Nokia Corporation | Domesheet assembly in a keyboard |
US8466814B2 (en) * | 2006-11-27 | 2013-06-18 | Samsung Electronics Co., Ltd. | Touch sensor |
US20080122661A1 (en) * | 2006-11-27 | 2008-05-29 | Samsung Electronics Co., Ltd. | Touch sensor |
US8879272B2 (en) | 2009-03-09 | 2014-11-04 | Apple Inc. | Multi-part substrate assemblies for low profile portable electronic devices |
US8339798B2 (en) * | 2010-07-08 | 2012-12-25 | Apple Inc. | Printed circuit boards with embedded components |
US8804363B2 (en) | 2010-07-08 | 2014-08-12 | Apple Inc. | Printed circuit boards with embedded components |
US20120008294A1 (en) * | 2010-07-08 | 2012-01-12 | Jahan Minoo | Printed circuit boards with embedded components |
US20160058514A1 (en) * | 2013-03-29 | 2016-03-03 | Olympus Corporation | Master-slave system |
US9974426B2 (en) * | 2013-03-29 | 2018-05-22 | Olympus Corporation | Master-slave system for moving slave unit based on motion commands inputted into two command input units held by each hand of operator |
US9627159B2 (en) * | 2014-10-21 | 2017-04-18 | Motorola Solutions, Inc. | Method and apparatus for providing slide actuation on a device |
Also Published As
Publication number | Publication date |
---|---|
GB1411589A (en) | 1975-10-29 |
NL7302687A (zh) | 1974-05-22 |
IT977322B (it) | 1974-09-10 |
JPS5718647B2 (zh) | 1982-04-17 |
NL171754C (nl) | 1983-05-02 |
BE795425A (fr) | 1973-05-29 |
BR7301255D0 (pt) | 1974-09-24 |
DE2306268A1 (de) | 1974-05-30 |
FR2207349B1 (zh) | 1975-08-22 |
JPS4984132A (zh) | 1974-08-13 |
CA981733A (en) | 1976-01-13 |
FR2207349A1 (zh) | 1974-06-14 |
GB1411590A (en) | 1975-10-29 |
DD112532A5 (zh) | 1975-04-12 |
NL171754B (nl) | 1982-12-01 |
KR780000687B1 (en) | 1978-12-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3806673A (en) | Pushbutton keyboard switch assembly with improved disc spring contact and printed circuit structure | |
US3898421A (en) | Push button switch with elastic conductive sheet | |
US6271487B1 (en) | Normally open extended travel dual tact switch assembly with sequential actuation of individual switches | |
US3818153A (en) | Pushbutton switch assembly for keyboards including a bridging conductive, elastomeric diaphragm type contact | |
US3996427A (en) | Pushbutton keyboard system and method of making same | |
US3760137A (en) | Matrix push-button switch | |
US3856998A (en) | Keyboard switch assembly with improved operating means | |
US3684842A (en) | Pushbutton keyboard switch assembly with improved over center diaphragm contact | |
US6700565B2 (en) | Slide switch | |
US5626223A (en) | Cam-assisted switch | |
US3928741A (en) | Momentary contact single pole switch | |
US3808384A (en) | Pushbutton keyboard system | |
US4529848A (en) | Switch with conical spring actuator | |
CA1242258A (en) | Keyboard for initiating switching operations or switching signals associated with respective symbols on the surfaces of the keys | |
GB2046996A (en) | Electrical switch | |
US3940578A (en) | Keyboard structure having panel mounted key actuators with electrical component operating element | |
GB1579966A (en) | Capacitive key for keyboard | |
US3210484A (en) | Push button device | |
US5667061A (en) | Linear cam-assisted plunger switch | |
US4438304A (en) | Double throw snap action switch | |
US4760221A (en) | Multiple contact switch | |
US3342967A (en) | Pushbutton switch | |
US3911233A (en) | Keyboard switch for desk top electronic calculators | |
EP0500127A2 (en) | Momentary pushbutton slide switch | |
US3928736A (en) | Keyboard switch assembly having discrete helical conductors providing wiping action |