US3789167A - Multi-output level keyboard switch assembly with improved operator and contact structure - Google Patents

Multi-output level keyboard switch assembly with improved operator and contact structure Download PDF

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US3789167A
US3789167A US00316656A US3789167DA US3789167A US 3789167 A US3789167 A US 3789167A US 00316656 A US00316656 A US 00316656A US 3789167D A US3789167D A US 3789167DA US 3789167 A US3789167 A US 3789167A
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segments
pathways
windows
electrical
insulator
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US00316656A
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R Seeger
J Coulter
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LUCAS DURALITH AKT Corp
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Chomerics Inc
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Assigned to AMP INCORPORATED reassignment AMP INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CHOMERICS, INC.
Assigned to AMP KEYBOARD TECHNOLOGIES, INC., A WHOLLY OWNED SUBSIDIARY OF AMP reassignment AMP KEYBOARD TECHNOLOGIES, INC., A WHOLLY OWNED SUBSIDIARY OF AMP ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AMP INCORPORATED
Assigned to LUCAS DURALITH AKT CORPORATION reassignment LUCAS DURALITH AKT CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: AMP KEYBOARD TECHNOLOGIES INC.
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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2207/00—Connections
    • H01H2207/012—Connections via underside of substrate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00—Layers
    • H01H2209/068—Properties of the membrane
    • H01H2209/078—Conductive rubber
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2223/00—Casings
    • H01H2223/034—Bezel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/024—Packing between substrate and membrane
    • H01H2229/026—Riveting
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/044—Injection moulding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/044—High voltage application

Definitions

  • ABSTRACT A structure which includes a circuit board having a conductive pattern thereon and supporting a resilient [52] us 200/5 200/159 200/166 C conductive layer by way of an insulator layerhaving a [51] [11L Cl. H0111 13/52 plurality of windows therethrough in alignment i [58] of SearchZOO/ 1 5 5 16 A, 159 portions of the conductive pattern, the resilient layer 200/166 C divided into at least two sections held electrically apart by pins coupled to a frame member in which the [56] References Cted board and layers are packaged.
  • each of the keyboard output terminals provided the same output voltage level to represent respective key depression or switch closure. This was quite adequate as long as a single output level was all that was needed to drive digital logic circuitry or the like. But as time went on there grew the need for a keyboard to supply not only the signals for logic circuits but also some signals at much higher voltage levels to control operative or analog devices such as a servomechanism.
  • the keyboard of the present invention provides mul tiple voltage level outputs from different terminals thereof by using a multi-segrnent conductive layer or pad positioned on an insulator layer having a plurality of windows therethrough in alignment with portions of a conductive pattern, the segments of the conductive layer being electrically separated from each other by retaining means and in the preferred embodiment being coupled to different input or supply signal terminals.
  • Key or switch-like members of the keyboard are depressible to force the conductive segments through selected ones of the windows of the insulator layer against portions of the conductive pattern in order to provide output signalsat keyboard output terminals coupled to different portions of the conductive pattern.
  • FIG. 1 is a top view of a keyboard of the present invention
  • FIG. 2 is a bottom view with the parts cut away of the keyboard
  • FIG. 3 is a sectional view broken'at the center and taken along line 3-3 of FIG. 1;
  • FIG. 4 is a sectional view taken along line 44 of FIG. 2.
  • FIGS. 1 to 4 Reference should now be had to FIGS. 1 to 4 for a description of the preferred embodiment of the disclosure.
  • the keyboard comprises a frame 10 preferably of insulator material more preferably of plastic such as A.B.S a high impact polystyrene or may be constructed of other type plastics such as polypropylene.
  • the frame is provided with a plurality of divider members 11 which form thewalls of windows 12 extending through frame.
  • the underside of the divider members 12 includes a plurality of rods 13 (preferably formed at the same time as the frame i.e., by molding [see FIG.2]) which extend downwardly as shown in FIG. 4.
  • the rods 13 are preferably of the same plastic material as the frame 10 and preferably may be softened by heat to form the head 13a to hold the keyboard assembly together as shown in FIG. 4. Alternatively the rods may be threaded and nuts may then be used to hold the keyboard assembly together.
  • a thin plastic insulator layer 14 e.g., of Mylar which has indicia applied thereto.
  • the indicia may be marked thereon using inks or may be applied thereto using other conventional techniques.
  • the layer 14 is provided with a plurality of holes 14a through which the rods 13 extend to locate it within the confines of the frame.
  • a conductive plastic layer 15 Positioned directly below the layer 14 is a conductive plastic layer 15 which is divided into at least two segments 15a and 15b.
  • the conductive layer is preferably of a resilient material such as plastic e.g., silicone rubber filled with 10 to percent by volume of silver flakes. Rubber is defined as a plastic for the purposes of this invention.
  • the segments 15a and 15b are electrically isolated from each other, lie in substantially the same plane, and are preferably held isolated by at least two of the rods 13 extending through holes l5aa formed in each of the segments 15a and 15b. 1
  • the segments 15a and 15b are positioned over an insulator plastic layer 16 e.g., of Mylar having a plurality of windows extending therethrough in line with windows 12.
  • the rods 13 also extend through holes 16b in layer 16 to locate the layer 16 within the frame 10.
  • a typical circuit board 17 tag of Bakelite having a plurality of conductive electrical v contacts or pathways 18 formed thereon. See the aforementioned application for typical circuit patterns or pathways.
  • the circuit pattern may be formed conventionally from copper which is etched or by the spraying of conductive paint.
  • the electrical pathways are at least in part aligned with the windows so that the application of a presence (by a finger) to the force applying layer 14 can push portions of the conductive layer segments through the Windows 160 against the pathways 18. In this manner electrical contact is made between the conductive segments and the pathways 18.
  • the resiliency of the conductive layer causes it to withdraw and spring back from the conductive layer and break contact.
  • the rods 13 extend through holes 170 in the board to hold the assembly together.
  • Electrical conductor pins 20 and 23 are electrically coupled directly to segments 15a and 15b respectively so that different input voltage levels may be applied to the segments e.g., 6v to pin 23 and segment 15b and 30v to pin 20 and segment 15a.
  • the pins 20 and 23 are preferably embedded in the segments 15a and 15b and extend through holes 16b formed in the layer 16.
  • FIG. 3 represents the keyboard under the indicia marking X and the right side of FIG. 3 represents the keyboard under the indicia marking O with the parts below the other indicia broken away.
  • a keyboard or the like which includes an insulator board having circuit pathways thereon, insulator means having a plurality of windows therethrough in alignment with selected portions of said pathways, a resilient electrically conductive layer means positioned on said insulator and divided into at least two segments that are spaced apart and electrically isolated from each other and lie in part in substantially the same plane, each of said segments covering at least one of said windows of said insulator layer, first means for pcsitioning and holding said segments in electrical isolation from each other, second means for applying force to push portions of said segments through said windows they overlie in order to make contact with said pathways, third means for providing electrical input signals to generate output signals represent of a force applied to said segments, a plurality of electrical signal output pins coupled to different ones of said pathways and in which the third means comprises electrical signal input pins, a different one of which is electrically coupled to each of said segments. 4
  • said first means comprises a frame which has a plurality of rods extending therefrom, at least two of said rods extending through each of said segments to locate said segments with respect to each other.
  • said frame is formed with a plurality of divider members de-- fining windows in at least partial alignment with said windows of said insulator layer and in which said second means comprises an indicia layer of insulator material positioned between said frame and said segments, said indicia layer having a plurality of markings thereon which may be seen through said windows in said frame.
  • a keyboard or the like comprising electrical conductive layer means divided into at least two segments electrically isolated from each other,

Abstract

A structure which includes a circuit board having a conductive pattern thereon and supporting a resilient conductive layer by way of an insulator layer having a plurality of windows therethrough in alignment with portions of the conductive pattern, the resilient layer divided into at least two sections held electrically apart by pins coupled to a frame member in which the board and layers are packaged.

Description

United States Patent [191 Seeger, Jr. et a1.
[ MULTI-OUTPUT LEVEL KEYBOARD SWITCH ASSEMBLY WITH IMPROVED OPERATOR AND CONTACT STRUCTURE [75] Inventors: Richard E. Seeger, Jr., Topsfield;
John G. Coulter, Reading, both of [21] Appl. No.: 316,656
1 Jan. 29, 1974 12/1972 Seeger, Jr. et a1. 200/5 A 3,721,778
3/1973 Seeger, Jr. et al. 200/159 B Primary ExaminerJ. R. Scott 5 7] ABSTRACT A structure which includes a circuit board having a conductive pattern thereon and supporting a resilient [52] us 200/5 200/159 200/166 C conductive layer by way of an insulator layerhaving a [51] [11L Cl. H0111 13/52 plurality of windows therethrough in alignment i [58] of SearchZOO/ 1 5 5 16 A, 159 portions of the conductive pattern, the resilient layer 200/166 C divided into at least two sections held electrically apart by pins coupled to a frame member in which the [56] References Cted board and layers are packaged.
UNITED STATES PATENTS 3,699,294 10/1972 Sudduth 200/159 B X 6 Claims, 4 Drawing Figures l0 I2 I50 l4 CONDUCTIVE PLASTIC I60 I 6b V Il' I ,3 Am ,n\\i\\ PATENTEDJANZSIBM 3.789'167 FIG'4 MULTI-OUTPUT LEVEL KEYBOARD SWITCH ASSEMBLY WITH IMPROVED OPERATOR AND CONTACT STRUCTURE STATEMENT OF THE DISCLOSURE keyboard structure which is constructed to provide more than one output voltage level.
This invention is an improvement over the keyboard structure shown copending in U.S. Pat. application Ser. No. 154,752 filed June 12, 1971 by Richard E. Seeger,.lr., and William J. Lynn now U.S. Pat. No. 3,721,778.
In the past i.e., as disclosed in the aforementioned application, each of the keyboard output terminals provided the same output voltage level to represent respective key depression or switch closure. This was quite adequate as long as a single output level was all that was needed to drive digital logic circuitry or the like. But as time went on there grew the need for a keyboard to supply not only the signals for logic circuits but also some signals at much higher voltage levels to control operative or analog devices such as a servomechanism.
While there are undoubtedly many ways of converting one voltage level to another voltage level using circuitry, this would have been quite expensive. Accordingly, there developed a need for the above to be accomplished using the basics of the keyboard structure shown in the above mentioned application without substantially raising the cost of keyboard construction. The present invention accomplishes the above multiple voltage level output requirement in a novel manner while using the basics of the prior keyboard structure with a minimum of costly modifications.
BRIEF DESCRIPTION OF THE DISCLOSURE The keyboard of the present invention provides mul tiple voltage level outputs from different terminals thereof by using a multi-segrnent conductive layer or pad positioned on an insulator layer having a plurality of windows therethrough in alignment with portions of a conductive pattern, the segments of the conductive layer being electrically separated from each other by retaining means and in the preferred embodiment being coupled to different input or supply signal terminals. Key or switch-like members of the keyboard are depressible to force the conductive segments through selected ones of the windows of the insulator layer against portions of the conductive pattern in order to provide output signalsat keyboard output terminals coupled to different portions of the conductive pattern.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view of a keyboard of the present invention;
FIG. 2 is a bottom view with the parts cut away of the keyboard;
FIG. 3 is a sectional view broken'at the center and taken along line 3-3 of FIG. 1; and
FIG. 4 is a sectional view taken along line 44 of FIG. 2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Reference should now be had to FIGS. 1 to 4 for a description of the preferred embodiment of the disclosure.
The keyboard comprises a frame 10 preferably of insulator material more preferably of plastic such as A.B.S a high impact polystyrene or may be constructed of other type plastics such as polypropylene. The frame is provided with a plurality of divider members 11 which form thewalls of windows 12 extending through frame.
The underside of the divider members 12 includes a plurality of rods 13 (preferably formed at the same time as the frame i.e., by molding [see FIG.2]) which extend downwardly as shown in FIG. 4. The rods 13 are preferably of the same plastic material as the frame 10 and preferably may be softened by heat to form the head 13a to hold the keyboard assembly together as shown in FIG. 4. Alternatively the rods may be threaded and nuts may then be used to hold the keyboard assembly together.
Positioned directly below the frame member 11 is a thin plastic insulator layer 14 e.g., of Mylar which has indicia applied thereto. The indicia may be marked thereon using inks or may be applied thereto using other conventional techniques.
The layer 14 is provided with a plurality of holes 14a through which the rods 13 extend to locate it within the confines of the frame.
Positioned directly below the layer 14 is a conductive plastic layer 15 which is divided into at least two segments 15a and 15b. The conductive layer is preferably of a resilient material such as plastic e.g., silicone rubber filled with 10 to percent by volume of silver flakes. Rubber is defined as a plastic for the purposes of this invention.
The segments 15a and 15b are electrically isolated from each other, lie in substantially the same plane, and are preferably held isolated by at least two of the rods 13 extending through holes l5aa formed in each of the segments 15a and 15b. 1
Reference may be had to U.S. Pat'Nos. 3, 140, 342 and 3, 576, 387 for a description of othermaterial compositions suitable for use as the layer comprising segments 15a and 15b.
The segments 15a and 15b are positioned over an insulator plastic layer 16 e.g., of Mylar having a plurality of windows extending therethrough in line with windows 12. The rods 13 also extend through holes 16b in layer 16 to locate the layer 16 within the frame 10.
Below the layer .16 is a typical circuit board 17 tag, of Bakelite having a plurality of conductive electrical v contacts or pathways 18 formed thereon. See the aforementioned application for typical circuit patterns or pathways.
The circuit pattern may be formed conventionally from copper which is etched or by the spraying of conductive paint.
The electrical pathways are at least in part aligned with the windows so that the application of a presence (by a finger) to the force applying layer 14 can push portions of the conductive layer segments through the Windows 160 against the pathways 18. In this manner electrical contact is made between the conductive segments and the pathways 18. When the force is withdrawn, the resiliency of the conductive layer causes it to withdraw and spring back from the conductive layer and break contact. The rods 13 extend through holes 170 in the board to hold the assembly together.
In order to make electrical contact with the conductive segments 15a and 15b as well as the pathways 18, there are provided pins -30 supported in connector supports 20a-23a mounted to the board 17.
Electrical conductor pins 20 and 23 are electrically coupled directly to segments 15a and 15b respectively so that different input voltage levels may be applied to the segments e.g., 6v to pin 23 and segment 15b and 30v to pin 20 and segment 15a. The pins 20 and 23 are preferably embedded in the segments 15a and 15b and extend through holes 16b formed in the layer 16.
Electrical contact is made to the pathways 18 via pins 21 and 22 as shown. The left side of FIG. 3 represents the keyboard under the indicia marking X and the right side of FIG. 3 represents the keyboard under the indicia marking O with the parts below the other indicia broken away.
What is claimed 1. In a keyboard or the like which includes an insulator board having circuit pathways thereon, insulator means having a plurality of windows therethrough in alignment with selected portions of said pathways, a resilient electrically conductive layer means positioned on said insulator and divided into at least two segments that are spaced apart and electrically isolated from each other and lie in part in substantially the same plane, each of said segments covering at least one of said windows of said insulator layer, first means for pcsitioning and holding said segments in electrical isolation from each other, second means for applying force to push portions of said segments through said windows they overlie in order to make contact with said pathways, third means for providing electrical input signals to generate output signals represent of a force applied to said segments, a plurality of electrical signal output pins coupled to different ones of said pathways and in which the third means comprises electrical signal input pins, a different one of which is electrically coupled to each of said segments. 4
2. In a keyboard as called for in claim 1 in 'which said first means comprises a frame which has a plurality of rods extending therefrom, at least two of said rods extending through each of said segments to locate said segments with respect to each other.
3. In a keyboard according to claim 2 in which said rods extend through each of said layers and board to make a sandwich thereof.
4. In a keyboard according to claim 3 in which said frame is formed with a plurality of divider members de-- fining windows in at least partial alignment with said windows of said insulator layer and in which said second means comprises an indicia layer of insulator material positioned between said frame and said segments, said indicia layer having a plurality of markings thereon which may be seen through said windows in said frame.
5. In a keyboard or the like comprising electrical conductive layer means divided into at least two segments electrically isolated from each other,
a plurality of electrical pathways isolated from each other,
means for retaining said segments electrically isolated from each other, insulator means for maintaining said segments electrically isolated from said electrical pathways and having windows in alignment to permit selected portions of said electrical pathways to make electrical contact with each of said segments, means for relatively moving said segments and said pathways with respect to each other in order for selected segments to make electrical contact with selected pathways through said windows, and first electrical signal pins, a different one of which is electrically coupled to each of said segments.
6. In a keyboard according to claim 5 in which second electrical signal pins are coupled to different ones of said pathways.

Claims (6)

1. In a keyboard or the like which includes an insulator board having circuit pathways thereon, insulator means having a plurality of windows therethrough in alignment with selected portions of said pathways, a resilient electrically conductive layer means positioned on said insulator and divided into at least two segments that are spaced apart and electrically isolated from each other and lie in part in substantially the same plane, each of said segments covering at least one of said windows of said insulator layer, first means for positioning and holding said segments in electrical isolation from each other, second means for applying force to push portions of said segments through said windows they overlie in order to make contact with said pathways, third means for providing electrical input signals to generate output signals represent of a force applied to said segments, a plurality of electrical signal output pins coupled to different ones of said pathways and in which the third means comprises electrical signal input pins, a different one of which is electrically coupled to each of said segments.
2. In a keyboard as called for in claim 1 in which said first means comprises a frame which has a plurality of rods extending therefrom, at least two of said rods extending through each of said segments to locate said segments with respect to each other.
3. In a keyboard according to claim 2 in which said rods extend through each of said layers and board to make a sandwich thereof.
4. In a keyboard according to claim 3 in which said frame is formed with a plurality of divider members defining windows in at least partial alignment with said windows of said insulator layer and in which said second means comprises an indicia layer of insulator material positioned between said frame and said segments, said indicia layer having a plurality of markings thereon which may be seen through said windows in said frame.
5. In a keyboard or the like comprising electrical conductive layer means divided into at least two segments electrically isolated from each other, a plurality of electrical pathways isolated from each other, means for retaining said segments electrically isolated from each other, insulator means for maintaining said segments electrically isolated from said electrical pathways and having windows in alignment to permit selected portions of said electrical pathways to make electrical contact with each of said segments, means for relatively moving said segments and said pathways with respect to each other in order for selected segments to make electrical contact with selected pathways through said windows, and first electrical signal pins, a different one of which is electrically coupled to each of said segments.
6. In a keyboard according to claim 5 in which second electrical signal pins are coupled to different ones of said pathways.
US00316656A 1972-12-20 1972-12-20 Multi-output level keyboard switch assembly with improved operator and contact structure Expired - Lifetime US3789167A (en)

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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3862381A (en) * 1973-10-29 1975-01-21 Chomerics Inc Keyboard switch assembly with multilayer, coextensive contactor means
US3930083A (en) * 1974-07-26 1975-12-30 Litton Systems Inc Keyboard panel for an electric switch contact
JPS518972A (en) * 1974-07-10 1976-01-24 Matsushita Electric Ind Co Ltd
US3973099A (en) * 1974-11-11 1976-08-03 American Micro-Systems, Inc. Push button switch for electronic watch
US4071718A (en) * 1976-10-22 1978-01-31 Bowmar Instrument Corporation Flat keyboard assembly having cover type membrane with protrusions to align switch components
US4128744A (en) * 1977-02-22 1978-12-05 Chomerics, Inc. Keyboard with concave and convex domes
US4145584A (en) * 1976-04-28 1979-03-20 Otterlei Jon L Flexible keyboard switch with integral spacer protrusions
JPS5471189U (en) * 1977-10-28 1979-05-21
US4158115A (en) * 1978-06-26 1979-06-12 W. H. Brady Co. Internally connecting flexible switch
US4194099A (en) * 1977-10-25 1980-03-18 W. H. Brady Co. Control panel overlay
US4243861A (en) * 1977-06-24 1981-01-06 The Cornelius Company Touch switch and contactor therefor
US4250495A (en) * 1979-11-16 1981-02-10 The Singer Company Touch sensitive control panel and a method of manufacture thereof
US4258096A (en) * 1978-11-09 1981-03-24 Sheldahl, Inc. Composite top membrane for flat panel switch arrays
US4368369A (en) * 1980-03-14 1983-01-11 Citizen Watch Co., Ltd. Electrical switch
US4390758A (en) * 1981-01-16 1983-06-28 Hendrickson Max S Key-actuated electrical lock
US4441097A (en) * 1979-01-29 1984-04-03 Antroy Enterprises, Inc. Device for controlling a circuit
US4440999A (en) * 1982-08-13 1984-04-03 Press On, Inc. Membrane switch
US4471177A (en) * 1982-08-13 1984-09-11 Press On, Inc. Enlarged switch area membrane switch and method
US5510783A (en) * 1992-07-13 1996-04-23 Interlink Electronics, Inc. Adaptive keypad
US20070046646A1 (en) * 2005-08-24 2007-03-01 Lg Electronics Inc. Mobile communications terminal having a touch input unit and controlling method thereof
US20070105604A1 (en) * 2005-08-30 2007-05-10 Zhi-Min Choo Mobile terminal with back-lighted directional keys
US20070103453A1 (en) * 2005-08-30 2007-05-10 Zhi-Min Choo Touch key assembly for a mobile terminal
US20080017491A1 (en) * 2005-12-05 2008-01-24 Farzad Azizi Electrical switch

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US3699294A (en) * 1971-05-18 1972-10-17 Flex Key Corp Keyboard, digital coding, switch for digital logic, and low power detector switches
US3705276A (en) * 1971-05-20 1972-12-05 Chomerics Inc Keyboard switch assembly with conductive plastic contactor and actuator spring sleeve biasing means
US3721778A (en) * 1971-06-21 1973-03-20 Chomerics Inc Keyboard switch assembly with improved operator and contact structure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3699294A (en) * 1971-05-18 1972-10-17 Flex Key Corp Keyboard, digital coding, switch for digital logic, and low power detector switches
US3705276A (en) * 1971-05-20 1972-12-05 Chomerics Inc Keyboard switch assembly with conductive plastic contactor and actuator spring sleeve biasing means
US3721778A (en) * 1971-06-21 1973-03-20 Chomerics Inc Keyboard switch assembly with improved operator and contact structure

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3862381A (en) * 1973-10-29 1975-01-21 Chomerics Inc Keyboard switch assembly with multilayer, coextensive contactor means
JPS518972A (en) * 1974-07-10 1976-01-24 Matsushita Electric Ind Co Ltd
US3930083A (en) * 1974-07-26 1975-12-30 Litton Systems Inc Keyboard panel for an electric switch contact
US3973099A (en) * 1974-11-11 1976-08-03 American Micro-Systems, Inc. Push button switch for electronic watch
US4145584A (en) * 1976-04-28 1979-03-20 Otterlei Jon L Flexible keyboard switch with integral spacer protrusions
US4071718A (en) * 1976-10-22 1978-01-31 Bowmar Instrument Corporation Flat keyboard assembly having cover type membrane with protrusions to align switch components
US4128744A (en) * 1977-02-22 1978-12-05 Chomerics, Inc. Keyboard with concave and convex domes
US4243861A (en) * 1977-06-24 1981-01-06 The Cornelius Company Touch switch and contactor therefor
US4194099A (en) * 1977-10-25 1980-03-18 W. H. Brady Co. Control panel overlay
JPS5729479Y2 (en) * 1977-10-28 1982-06-28
JPS5471189U (en) * 1977-10-28 1979-05-21
FR2430077A1 (en) * 1978-06-26 1980-01-25 Brady Co W H FLEXIBLE SWITCH WITH INTERNAL CONNECTIONS
US4158115A (en) * 1978-06-26 1979-06-12 W. H. Brady Co. Internally connecting flexible switch
US4258096A (en) * 1978-11-09 1981-03-24 Sheldahl, Inc. Composite top membrane for flat panel switch arrays
US4441097A (en) * 1979-01-29 1984-04-03 Antroy Enterprises, Inc. Device for controlling a circuit
US4250495A (en) * 1979-11-16 1981-02-10 The Singer Company Touch sensitive control panel and a method of manufacture thereof
US4368369A (en) * 1980-03-14 1983-01-11 Citizen Watch Co., Ltd. Electrical switch
US4390758A (en) * 1981-01-16 1983-06-28 Hendrickson Max S Key-actuated electrical lock
US4440999A (en) * 1982-08-13 1984-04-03 Press On, Inc. Membrane switch
US4471177A (en) * 1982-08-13 1984-09-11 Press On, Inc. Enlarged switch area membrane switch and method
US5510783A (en) * 1992-07-13 1996-04-23 Interlink Electronics, Inc. Adaptive keypad
US20070046646A1 (en) * 2005-08-24 2007-03-01 Lg Electronics Inc. Mobile communications terminal having a touch input unit and controlling method thereof
US9244602B2 (en) 2005-08-24 2016-01-26 Lg Electronics Inc. Mobile communications terminal having a touch input unit and controlling method thereof
US20070105604A1 (en) * 2005-08-30 2007-05-10 Zhi-Min Choo Mobile terminal with back-lighted directional keys
US20070103453A1 (en) * 2005-08-30 2007-05-10 Zhi-Min Choo Touch key assembly for a mobile terminal
US7982718B2 (en) * 2005-08-30 2011-07-19 Lg Electronics Inc. Mobile terminal with back-lighted directional keys
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