GB1412298A - Electrical signal initiating keyboards - Google Patents
Electrical signal initiating keyboardsInfo
- Publication number
- GB1412298A GB1412298A GB4105072A GB4105072A GB1412298A GB 1412298 A GB1412298 A GB 1412298A GB 4105072 A GB4105072 A GB 4105072A GB 4105072 A GB4105072 A GB 4105072A GB 1412298 A GB1412298 A GB 1412298A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tracks
- signals
- layer
- keyboards
- electrical signal
- 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
Links
Classifications
-
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/965—Switches controlled by moving an element forming part of the switch
- H03K17/967—Switches controlled by moving an element forming part of the switch having a plurality of control members, e.g. keyboard
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M11/00—Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys
- H03M11/22—Static coding
- H03M11/24—Static coding using analogue means, e.g. by coding the states of multiple switches into a single multi-level analogue signal or by indicating the type of a device using the voltage level at a specific tap of a resistive divider
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2201/00—Contacts
- H01H2201/022—Material
- H01H2201/032—Conductive polymer; Rubber
- H01H2201/036—Variable resistance
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Signal Processing (AREA)
- Push-Button Switches (AREA)
Abstract
1412298 Keyboards POST OFFICE 29 Nov 1973 [5 Sept 1972] 41050/72 Heading G4H [Also in Division H1] An electrical signal initiating keyboard includes a number of motion transmitting elements, a layer of resiliently deformable insulating foam material having at one face thereof a plurality of electrically-conductive tracks defined by conductive particles, and a plurality of terminals connected to associated ones of the tracks, the arrangement being that each motion transmitting element is operable to deform a respective area of the foam material to thereby change the resistance between terminals associated with that particular area. Fig. 3 shows a typical key 3, depression of which compresses a respective area of a sheet 1 of insulating foam so that a respective two out of fifteen tracks 2 of conductive particles make contact, through a respective hole 13 in a spacer 12, with a conducting layer 14. Seven signals are applied to the fifteen tracks through connections whereby three of the signals go to a respective track each and the other four signals go to a respective three of the tracks each. Consequently, the layer 14 receives two out of seven of the signals depending on the key pressed. Fig. 5 shows a modification in which the keys are integral with the top plate which is flexible, and the foam sheet 1 and the conducting layer 14 are interchanged, layer 14 being of flexible polymeric material. The spacer may be omitted.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4105072A GB1412298A (en) | 1972-09-05 | 1972-09-05 | Electrical signal initiating keyboards |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4105072A GB1412298A (en) | 1972-09-05 | 1972-09-05 | Electrical signal initiating keyboards |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1412298A true GB1412298A (en) | 1975-11-05 |
Family
ID=10417873
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4105072A Expired GB1412298A (en) | 1972-09-05 | 1972-09-05 | Electrical signal initiating keyboards |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1412298A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2535486A1 (en) * | 1982-10-27 | 1984-05-04 | Danish Sherif | MULTI-KEY KEYBOARD FOR DATA ENTRY INTO A COMPUTER |
FR2590754A1 (en) * | 1985-11-22 | 1987-05-29 | Morse Nena | TELEPHONE SWITCH WITH KEYBOARD WITH TOUCHES RESISTANT TO VANDALISM |
GB2191617A (en) * | 1986-06-11 | 1987-12-16 | Salplex Ltd | Manually operable electrical switches for signalling & control |
US8674932B2 (en) | 1996-07-05 | 2014-03-18 | Anascape, Ltd. | Image controller |
US9081426B2 (en) | 1992-03-05 | 2015-07-14 | Anascape, Ltd. | Image controller |
-
1972
- 1972-09-05 GB GB4105072A patent/GB1412298A/en not_active Expired
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2535486A1 (en) * | 1982-10-27 | 1984-05-04 | Danish Sherif | MULTI-KEY KEYBOARD FOR DATA ENTRY INTO A COMPUTER |
US4555693A (en) * | 1982-10-27 | 1985-11-26 | Polytel Corp. | Multikey keyboard for inputting data into a computer |
FR2590754A1 (en) * | 1985-11-22 | 1987-05-29 | Morse Nena | TELEPHONE SWITCH WITH KEYBOARD WITH TOUCHES RESISTANT TO VANDALISM |
GB2191617A (en) * | 1986-06-11 | 1987-12-16 | Salplex Ltd | Manually operable electrical switches for signalling & control |
US4777378A (en) * | 1986-06-11 | 1988-10-11 | Salplex Limited | Information handling and control systems, manually operable electrical switches for use in such systems, and methods of testing such switches in such systems |
GB2191617B (en) * | 1986-06-11 | 1990-09-19 | Salplex Ltd | Manually operable electrical switches for use in information handling and control systems |
US9081426B2 (en) | 1992-03-05 | 2015-07-14 | Anascape, Ltd. | Image controller |
US8674932B2 (en) | 1996-07-05 | 2014-03-18 | Anascape, Ltd. | Image controller |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
PCNP | Patent ceased through non-payment of renewal fee | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) |