JPS5088934A - - Google Patents

Info

Publication number
JPS5088934A
JPS5088934A JP49133767A JP13376774A JPS5088934A JP S5088934 A JPS5088934 A JP S5088934A JP 49133767 A JP49133767 A JP 49133767A JP 13376774 A JP13376774 A JP 13376774A JP S5088934 A JPS5088934 A JP S5088934A
Authority
JP
Japan
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.)
Granted
Application number
JP49133767A
Other versions
JPS5751128B2 (ja
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 filed Critical
Publication of JPS5088934A publication Critical patent/JPS5088934A/ja
Publication of JPS5751128B2 publication Critical patent/JPS5751128B2/ja
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H03M11/02—Details
    • 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
    • H03K17/975—Switches controlled by moving an element forming part of the switch using a capacitive movable element
    • 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
    • H03K17/975—Switches controlled by moving an element forming part of the switch using a capacitive movable element
    • H03K17/98—Switches controlled by moving an element forming part of the switch using a capacitive movable element having a plurality of control members, e.g. keyboard

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Electronic Switches (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Push-Button Switches (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
JP49133767A 1973-11-29 1974-11-22 Expired JPS5751128B2 (ja)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/420,132 US3931610A (en) 1973-11-29 1973-11-29 Capacitive keyswitch sensor and method

Publications (2)

Publication Number Publication Date
JPS5088934A true JPS5088934A (ja) 1975-07-17
JPS5751128B2 JPS5751128B2 (ja) 1982-10-30

Family

ID=23665213

Family Applications (1)

Application Number Title Priority Date Filing Date
JP49133767A Expired JPS5751128B2 (ja) 1973-11-29 1974-11-22

Country Status (6)

Country Link
US (1) US3931610A (ja)
JP (1) JPS5751128B2 (ja)
CA (1) CA1013819A (ja)
DE (1) DE2455434C2 (ja)
GB (1) GB1489630A (ja)
IT (1) IT1025901B (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5223217A (en) * 1975-08-15 1977-02-22 Pentel Kk Information input unit
JPS5621226A (en) * 1979-07-30 1981-02-27 Ibm Data entry keybord

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4001676A (en) * 1975-08-27 1977-01-04 General Motors Corporation Solid-state threshold detector
US4163222A (en) * 1976-02-27 1979-07-31 Amkey, Incorporated Synchronous phase detected keyboard
US4157539A (en) * 1976-10-14 1979-06-05 The Singer Company Charge rate, capacitive switch system
US4145748A (en) * 1977-12-23 1979-03-20 General Electric Company Self-optimizing touch pad sensor circuit
US4166974A (en) * 1978-01-23 1979-09-04 The United States Of America As Represented By The Secretary Of The Navy Apparatus and method for measuring capacitive energy
US4219875A (en) * 1978-05-05 1980-08-26 Honeywell Inc. Digital event input circuit for a computer based process control system
US4211915A (en) * 1978-12-04 1980-07-08 General Electric Company Keyboard verification system
US4405917A (en) * 1981-04-28 1983-09-20 Honeywell Inc. Matrix screening and grounding arrangement and method
US4539554A (en) * 1982-10-18 1985-09-03 At&T Bell Laboratories Analog integrated circuit pressure sensor
US4595913A (en) * 1983-02-10 1986-06-17 Pie Associates Capacitor touch activated switching system
US4736191A (en) * 1985-08-02 1988-04-05 Karl E. Matzke Touch activated control method and apparatus
US4728931A (en) * 1986-07-25 1988-03-01 Honeywell Inc. Charge redistribution capacitance detection apparatus
US4728932A (en) * 1986-07-25 1988-03-01 Honeywell Inc. Detector for capacitive sensing devices
DE3677986D1 (de) * 1986-10-21 1991-04-11 Ibm Verfahren zur digitalen regelung der flankensteilheit der ausgangssignale von leistungsverstaerkern der fuer einen computer bestimmten halbleiterchips mit hochintegrierten schaltungen.
CA1332183C (en) * 1989-06-23 1994-09-27 Richard W. Henderson Capacitance probe assembly
US5889236A (en) * 1992-06-08 1999-03-30 Synaptics Incorporated Pressure sensitive scrollbar feature
US5880411A (en) 1992-06-08 1999-03-09 Synaptics, Incorporated Object position detector with edge motion feature and gesture recognition
US6239389B1 (en) 1992-06-08 2001-05-29 Synaptics, Inc. Object position detection system and method
EP0574213B1 (en) * 1992-06-08 1999-03-24 Synaptics, Inc. Object position detector
US5861583A (en) * 1992-06-08 1999-01-19 Synaptics, Incorporated Object position detector
US6380929B1 (en) 1996-09-20 2002-04-30 Synaptics, Incorporated Pen drawing computer input device
US5854625A (en) * 1996-11-06 1998-12-29 Synaptics, Incorporated Force sensing touchpad
US8327204B2 (en) * 2005-10-27 2012-12-04 Dft Microsystems, Inc. High-speed transceiver tester incorporating jitter injection
TW200821589A (en) * 2006-07-14 2008-05-16 Dft Microsystems Inc Signal integrity measurement systems and methods using a predominantly digital time-base generator
US7681091B2 (en) 2006-07-14 2010-03-16 Dft Microsystems, Inc. Signal integrity measurement systems and methods using a predominantly digital time-base generator
US7813297B2 (en) * 2006-07-14 2010-10-12 Dft Microsystems, Inc. High-speed signal testing system having oscilloscope functionality
US7917319B2 (en) * 2008-02-06 2011-03-29 Dft Microsystems Inc. Systems and methods for testing and diagnosing delay faults and for parametric testing in digital circuits
WO2014068360A1 (en) * 2012-10-31 2014-05-08 Diehl Ako Stiftung & Co. Kg Piezo key sensing circuit and method for testing the piezo key sensing circuit
FR3002643B1 (fr) * 2013-02-26 2015-04-03 Continental Automotive France Procede de recherche de variation electrique d'un capteur capacitif de vehicule automobile
CN112583417B (zh) * 2019-09-30 2023-08-29 瑞昱半导体股份有限公司 用于扫描键盘电路的方法

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2963697A (en) * 1956-02-13 1960-12-06 Bendix Corp Code conversion system
US3577140A (en) * 1967-06-27 1971-05-04 Ibm Triple integrating ramp analog-to-digital converter
US3480857A (en) * 1967-12-27 1969-11-25 Ibm Digital method and apparatus for measuring small inductances and capacitances
US3653038A (en) * 1970-02-20 1972-03-28 United Bank Of Denver National Capacitive electric signal device and keyboard using said device
US3744026A (en) * 1970-06-10 1973-07-03 Identicon Corp Optical label scanning
US3671822A (en) * 1970-12-17 1972-06-20 Teletype Corp Variable capacitive apparatus
US3745536A (en) * 1971-03-01 1973-07-10 Burroughs Corp High speed serial scan and read-out of keyboards
US3761736A (en) * 1971-05-12 1973-09-25 Godwin Warren Engin Ltd Proximity switches
FR2142732B1 (ja) * 1971-06-24 1975-02-07 Commissariat Energie Atomique
US3761805A (en) * 1971-06-24 1973-09-25 Western Electric Co Methods of and systems for measuring capacitance using a constant current charging technique
US3750113A (en) * 1971-11-12 1973-07-31 Becton Dickinson Co Capacitive keyboard
US3786497A (en) * 1972-07-31 1974-01-15 Ibm Matrix keyboard method and apparatus
JPS539542B2 (ja) * 1972-09-21 1978-04-06

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5223217A (en) * 1975-08-15 1977-02-22 Pentel Kk Information input unit
JPS5621226A (en) * 1979-07-30 1981-02-27 Ibm Data entry keybord

Also Published As

Publication number Publication date
IT1025901B (it) 1978-08-30
DE2455434C2 (de) 1982-06-09
CA1013819A (en) 1977-07-12
DE2455434A1 (de) 1975-06-05
US3931610A (en) 1976-01-06
GB1489630A (en) 1977-10-26
JPS5751128B2 (ja) 1982-10-30

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