GB1540249A - Optical key switch - Google Patents

Optical key switch

Info

Publication number
GB1540249A
GB1540249A GB2798276A GB2798276A GB1540249A GB 1540249 A GB1540249 A GB 1540249A GB 2798276 A GB2798276 A GB 2798276A GB 2798276 A GB2798276 A GB 2798276A GB 1540249 A GB1540249 A GB 1540249A
Authority
GB
United Kingdom
Prior art keywords
key switch
optical key
optical
switch
key
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
Application number
GB2798276A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB2798276A priority Critical patent/GB1540249A/en
Priority to BE2056052A priority patent/BE856515R/en
Publication of GB1540249A publication Critical patent/GB1540249A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J5/00—Devices or arrangements for controlling character selection
    • B41J5/08—Character or syllable selected by means of keys or keyboards of the typewriter type
    • 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
    • H03K17/968—Switches controlled by moving an element forming part of the switch using opto-electronic devices
    • H03K17/969—Switches controlled by moving an element forming part of the switch using opto-electronic devices having a plurality of control members, e.g. keyboard
GB2798276A 1976-07-06 1976-07-06 Optical key switch Expired GB1540249A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2798276A GB1540249A (en) 1976-07-06 1976-07-06 Optical key switch
BE2056052A BE856515R (en) 1976-07-06 1977-07-06 OPTICAL SWITCH

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2798276A GB1540249A (en) 1976-07-06 1976-07-06 Optical key switch

Publications (1)

Publication Number Publication Date
GB1540249A true GB1540249A (en) 1979-02-07

Family

ID=10268382

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2798276A Expired GB1540249A (en) 1976-07-06 1976-07-06 Optical key switch

Country Status (2)

Country Link
BE (1) BE856515R (en)
GB (1) GB1540249A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2536185A1 (en) * 1982-11-16 1984-05-18 Thomson Csf Data input device.
WO2004001970A2 (en) * 2002-06-20 2003-12-31 Koninklijke Philips Electronics N.V. Sensor device and display device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2536185A1 (en) * 1982-11-16 1984-05-18 Thomson Csf Data input device.
WO2004001970A2 (en) * 2002-06-20 2003-12-31 Koninklijke Philips Electronics N.V. Sensor device and display device
WO2004001970A3 (en) * 2002-06-20 2004-04-08 Koninkl Philips Electronics Nv Sensor device and display device

Also Published As

Publication number Publication date
BE856515R (en) 1978-01-06

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee