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IT1000056B - IMPROVEMENT IN KEYPAD SWITCHES FOR ELECTRONIC TABLE CALCULATORS - Google Patents

IMPROVEMENT IN KEYPAD SWITCHES FOR ELECTRONIC TABLE CALCULATORS

Info

Publication number
IT1000056B
IT1000056B IT7352382A IT5238273A IT1000056B IT 1000056 B IT1000056 B IT 1000056B IT 7352382 A IT7352382 A IT 7352382A IT 5238273 A IT5238273 A IT 5238273A IT 1000056 B IT1000056 B IT 1000056B
Authority
IT
Italy
Prior art keywords
improvement
electronic table
keypad switches
calculators
table calculators
Prior art date
Application number
IT7352382A
Other languages
Italian (it)
Original Assignee
Matsushita Electric Corp
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
Priority claimed from JP1973022310U external-priority patent/JPS5327328Y2/ja
Priority claimed from JP2093873A external-priority patent/JPS5331537B2/ja
Priority claimed from JP3406773U external-priority patent/JPS5327330Y2/ja
Priority claimed from JP1973037336U external-priority patent/JPS5512331Y2/ja
Priority claimed from JP3840373U external-priority patent/JPS5512332Y2/ja
Application filed by Matsushita Electric Corp filed Critical Matsushita Electric Corp
Application granted granted Critical
Publication of IT1000056B publication Critical patent/IT1000056B/en

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
    • H01H13/702—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
    • 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
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2237/00—Mechanism between key and laykey
IT7352382A 1973-02-20 1973-09-06 IMPROVEMENT IN KEYPAD SWITCHES FOR ELECTRONIC TABLE CALCULATORS IT1000056B (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP1973022310U JPS5327328Y2 (en) 1973-02-20 1973-02-20
JP2093873A JPS5331537B2 (en) 1973-02-20 1973-02-20
JP3406773U JPS5327330Y2 (en) 1973-03-20 1973-03-20
JP1973037336U JPS5512331Y2 (en) 1973-03-27 1973-03-27
JP3840373U JPS5512332Y2 (en) 1973-03-29 1973-03-29

Publications (1)

Publication Number Publication Date
IT1000056B true IT1000056B (en) 1976-03-30

Family

ID=27520272

Family Applications (1)

Application Number Title Priority Date Filing Date
IT7352382A IT1000056B (en) 1973-02-20 1973-09-06 IMPROVEMENT IN KEYPAD SWITCHES FOR ELECTRONIC TABLE CALCULATORS

Country Status (6)

Country Link
US (1) US3911233A (en)
DE (1) DE2345578A1 (en)
FR (1) FR2218636B1 (en)
GB (1) GB1396467A (en)
IT (1) IT1000056B (en)
NL (1) NL7312430A (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032728A (en) * 1974-12-20 1977-06-28 Olympia Werke Ag Push button switch
US4109118A (en) * 1976-09-01 1978-08-22 Victor Kley Keyswitch pad
US4242546A (en) 1978-11-06 1980-12-30 International Telephone And Telegraph Corporation Electrical push-button switch
US4418605A (en) * 1980-06-25 1983-12-06 Pratt-Read Corporation Keyboard for musical instrument
DE3123438C2 (en) * 1981-06-12 1985-02-07 Wilhelm Ruf KG, 8000 München Switching arrangement
US4500756A (en) * 1982-03-19 1985-02-19 Pratt-Read Corporation Keyboard switch having a deformable membrane formed of cellular urethane
JPS59101724A (en) * 1982-11-30 1984-06-12 日本メクトロン株式会社 Keyboard switch
GB8303679D0 (en) * 1983-02-10 1983-03-16 Gould Instr Ltd Variable control device
US4456800A (en) * 1983-05-25 1984-06-26 Allen-Bradley Company Planar contact array switch having improved ground path for dissipating electrostatic discharges
CN86101312A (en) * 1985-02-12 1986-10-22 日本乐器制造株式会社 Keyboard switch apparatus for electronic musical instrument
JP3099165B2 (en) * 1993-06-28 2000-10-16 セイコーインスツルメンツ株式会社 Electronic device having switch mechanism and method of manufacturing substrate
US6423918B1 (en) * 2000-03-21 2002-07-23 Lear Corporation Dome switch
TW554358B (en) * 2002-08-13 2003-09-21 Umax Data Systems Inc Structure of button and method of design the same

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2025981A (en) * 1935-05-29 1935-12-31 Fred I Getty Multiple circuit closer for steering wheels
US2848920A (en) * 1955-03-02 1958-08-26 John M Lester Key contact system for electronic organs
US3304386A (en) * 1964-06-25 1967-02-14 Jr Bernard Edward Shlesinger Multiple contact program system fluid pressure type
US3600528A (en) * 1969-09-25 1971-08-17 Lematex Corp Multiple switch construction
US3668337A (en) * 1971-01-18 1972-06-06 Thomas & Betts Corp Matrix switch with improved flexible insulative spacer arrangement
US3745536A (en) * 1971-03-01 1973-07-10 Burroughs Corp High speed serial scan and read-out of keyboards
US3743798A (en) * 1971-09-13 1973-07-03 North American Rockwell Elongated spring coil conductors applying tension force to pushbutton actuators in keyboard matrix switch assembly
US3773998A (en) * 1972-10-16 1973-11-20 Chomerics Inc Pedestal and spring member for key actuator of diaphragm switch

Also Published As

Publication number Publication date
GB1396467A (en) 1975-06-04
FR2218636B1 (en) 1977-09-30
DE2345578A1 (en) 1974-09-05
FR2218636A1 (en) 1974-09-13
NL7312430A (en) 1974-08-22
US3911233A (en) 1975-10-07

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