JPS5750043A - Key input device - Google Patents

Key input device

Info

Publication number
JPS5750043A
JPS5750043A JP55125701A JP12570180A JPS5750043A JP S5750043 A JPS5750043 A JP S5750043A JP 55125701 A JP55125701 A JP 55125701A JP 12570180 A JP12570180 A JP 12570180A JP S5750043 A JPS5750043 A JP S5750043A
Authority
JP
Japan
Prior art keywords
circuit
key
oscillation
time
key input
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
JP55125701A
Other languages
Japanese (ja)
Other versions
JPS6243211B2 (en
Inventor
Shinji Suda
Kazuharu Nishitani
Hiroshi Kobayashi
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi 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
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP55125701A priority Critical patent/JPS5750043A/en
Publication of JPS5750043A publication Critical patent/JPS5750043A/en
Publication of JPS6243211B2 publication Critical patent/JPS6243211B2/ja
Granted 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
    • H03M11/20—Dynamic coding, i.e. by key scanning

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Selective Calling Equipment (AREA)

Abstract

PURPOSE:To get rid of a defect such as oscillation does not stop by the intra-key- matrix wiring capacity coupling when turning on and off a key, in a key input device which stops a scanning oscillation when turning off a key, and starts the oscillation when turning on one key. CONSTITUTION:When one key of a keyboard matrix 3 is turned on, it is detected, an oscillating circuit 1 starts its oscillation, a scanning signal is formed through a timing generating circuit 2 and a scan outputting circuit 4, and this signal is encoded in an encoder circuit 6 through a key inputting circuit 5. When the key is turned off, the scanning signal is not inputted to said circuit 5, and a timer circuit 10 for inhibiting a key input and read is operated at the time of rise of a key input deciding and detecting signal from a deciding circuit 7. When this timer time is made longer enough than the time when the scanning signal is applied to the circuit 5 by the capacity coupling, the oscillation stops at the time of an output from the timer circuit 10.
JP55125701A 1980-09-08 1980-09-08 Key input device Granted JPS5750043A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55125701A JPS5750043A (en) 1980-09-08 1980-09-08 Key input device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55125701A JPS5750043A (en) 1980-09-08 1980-09-08 Key input device

Publications (2)

Publication Number Publication Date
JPS5750043A true JPS5750043A (en) 1982-03-24
JPS6243211B2 JPS6243211B2 (en) 1987-09-11

Family

ID=14916570

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55125701A Granted JPS5750043A (en) 1980-09-08 1980-09-08 Key input device

Country Status (1)

Country Link
JP (1) JPS5750043A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0272520U (en) * 1988-11-22 1990-06-01
CN104104392A (en) * 2013-04-12 2014-10-15 微盟电子(昆山)有限公司 Key judgment method and device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51100639A (en) * 1975-03-03 1976-09-06 Matsushita Electric Ind Co Ltd
JPS5210628A (en) * 1975-07-16 1977-01-27 Omron Tateisi Electronics Co Key input device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51100639A (en) * 1975-03-03 1976-09-06 Matsushita Electric Ind Co Ltd
JPS5210628A (en) * 1975-07-16 1977-01-27 Omron Tateisi Electronics Co Key input device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0272520U (en) * 1988-11-22 1990-06-01
CN104104392A (en) * 2013-04-12 2014-10-15 微盟电子(昆山)有限公司 Key judgment method and device
CN104104392B (en) * 2013-04-12 2018-08-10 微盟电子(昆山)有限公司 Key judgment method and device

Also Published As

Publication number Publication date
JPS6243211B2 (en) 1987-09-11

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