DE2247972A1 - Abfuehleinrichtung fuer kapazitaetsmatrix - Google Patents

Abfuehleinrichtung fuer kapazitaetsmatrix

Info

Publication number
DE2247972A1
DE2247972A1 DE19722247972 DE2247972A DE2247972A1 DE 2247972 A1 DE2247972 A1 DE 2247972A1 DE 19722247972 DE19722247972 DE 19722247972 DE 2247972 A DE2247972 A DE 2247972A DE 2247972 A1 DE2247972 A1 DE 2247972A1
Authority
DE
Germany
Prior art keywords
capacitance
amplifier
sensing
row
column
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.)
Pending
Application number
DE19722247972
Other languages
German (de)
English (en)
Inventor
William George Crouse
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.)
International Business Machines Corp
Original Assignee
International Business Machines 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
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of DE2247972A1 publication Critical patent/DE2247972A1/de
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C17/00—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards
    • G11C17/04—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards using capacitive elements
    • 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

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Amplifiers (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Electronic Switches (AREA)
DE19722247972 1971-11-30 1972-09-29 Abfuehleinrichtung fuer kapazitaetsmatrix Pending DE2247972A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20339071A 1971-11-30 1971-11-30

Publications (1)

Publication Number Publication Date
DE2247972A1 true DE2247972A1 (de) 1973-06-07

Family

ID=22753791

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19722247972 Pending DE2247972A1 (de) 1971-11-30 1972-09-29 Abfuehleinrichtung fuer kapazitaetsmatrix

Country Status (4)

Country Link
JP (1) JPS5437457B2 (enExample)
DE (1) DE2247972A1 (enExample)
FR (1) FR2161969B1 (enExample)
GB (1) GB1363778A (enExample)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5611144Y2 (enExample) * 1975-04-08 1981-03-13
JPH07109572B2 (ja) * 1984-02-29 1995-11-22 東京プレス工業株式会社 キャパシティブキ−ボ−ド
GB2168816A (en) * 1984-12-19 1986-06-25 Philips Electronic Associated Touch-sensitive position sensor apparatus
US4651133A (en) * 1984-12-24 1987-03-17 At&T Technologies, Inc. Method and apparatus for capacitive keyboard scanning
US5499208A (en) * 1994-09-12 1996-03-12 At&T Corp. Integrated circuit memory device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3293640A (en) * 1964-05-22 1966-12-20 Chalfin Albert Electronic systems keyboard and switch matrix
US3437795A (en) * 1965-06-28 1969-04-08 Ampex Data input devices and systems
DE1549570A1 (de) * 1967-04-03 1971-03-04 Elektronische Rechenmasch Ind Schaltung fuer eine kontaktlose Tastatur,vorzugsweise fuer elektronische Rechenmaschinen

Also Published As

Publication number Publication date
JPS5437457B2 (enExample) 1979-11-15
GB1363778A (en) 1974-08-14
JPS4864838A (enExample) 1973-09-07
FR2161969B1 (enExample) 1975-03-28
FR2161969A1 (enExample) 1973-07-13

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Legal Events

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OHJ Non-payment of the annual fee