JPS5549732A - Electrostatic capacity type keyboard - Google Patents

Electrostatic capacity type keyboard

Info

Publication number
JPS5549732A
JPS5549732A JP12230178A JP12230178A JPS5549732A JP S5549732 A JPS5549732 A JP S5549732A JP 12230178 A JP12230178 A JP 12230178A JP 12230178 A JP12230178 A JP 12230178A JP S5549732 A JPS5549732 A JP S5549732A
Authority
JP
Japan
Prior art keywords
electrostatic capacity
switch
signal
scanning
circuit
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.)
Granted
Application number
JP12230178A
Other languages
Japanese (ja)
Other versions
JPS6036607B2 (en
Inventor
Tatsuro Konuma
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP53122301A priority Critical patent/JPS6036607B2/en
Publication of JPS5549732A publication Critical patent/JPS5549732A/en
Publication of JPS6036607B2 publication Critical patent/JPS6036607B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Input From Keyboards Or The Like (AREA)

Abstract

PURPOSE: To eliminate chattering of an electrostatic capacity-type switch by deciding ON in case of ON in re-check at a delay time after switch ON signal detection.
CONSTITUTION: Operation states of electrostatic capacity-type switches at intersections of matrix 6 are monitored by scanning successively plural signal lines 18 and scanning successively plural receiving lines 14 selectively synchronously with a series of transmission pulse trains. At this time, when a switch ON signal is detected in a specific positin, ON is decided in case of ON in re-scanning after a fixed time elapse. Bias circuit 11 wich gives a threshold and matrix signal detection circuit 8 which has a feedback resistance are used as a circuit for this ON detection.
COPYRIGHT: (C)1980,JPO&Japio
JP53122301A 1978-10-04 1978-10-04 capacitive keyboard Expired JPS6036607B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53122301A JPS6036607B2 (en) 1978-10-04 1978-10-04 capacitive keyboard

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53122301A JPS6036607B2 (en) 1978-10-04 1978-10-04 capacitive keyboard

Publications (2)

Publication Number Publication Date
JPS5549732A true JPS5549732A (en) 1980-04-10
JPS6036607B2 JPS6036607B2 (en) 1985-08-21

Family

ID=14832558

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53122301A Expired JPS6036607B2 (en) 1978-10-04 1978-10-04 capacitive keyboard

Country Status (1)

Country Link
JP (1) JPS6036607B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5965348A (en) * 1982-10-06 1984-04-13 Toupure Kk Capacitive keyboard
JPS60181815A (en) * 1984-02-29 1985-09-17 Toupure Kk capacitive keyboard
JPS61234418A (en) * 1985-04-11 1986-10-18 Matsushita Electric Ind Co Ltd Keyboard switch drive circuit
JPS61260317A (en) * 1985-05-15 1986-11-18 Oki Electric Ind Co Ltd Control system for electrostatic capacity type keyboard
JPH01185630A (en) * 1988-01-20 1989-07-25 Fuji Photo Film Co Ltd Heat developable photosensitive material

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5965348A (en) * 1982-10-06 1984-04-13 Toupure Kk Capacitive keyboard
JPS60181815A (en) * 1984-02-29 1985-09-17 Toupure Kk capacitive keyboard
US4772874A (en) * 1984-02-29 1988-09-20 Topre Corporation Keyboard apparatus
JPS61234418A (en) * 1985-04-11 1986-10-18 Matsushita Electric Ind Co Ltd Keyboard switch drive circuit
JPS61260317A (en) * 1985-05-15 1986-11-18 Oki Electric Ind Co Ltd Control system for electrostatic capacity type keyboard
JPH01185630A (en) * 1988-01-20 1989-07-25 Fuji Photo Film Co Ltd Heat developable photosensitive material

Also Published As

Publication number Publication date
JPS6036607B2 (en) 1985-08-21

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