JPS5567830A - Keyboard input device - Google Patents

Keyboard input device

Info

Publication number
JPS5567830A
JPS5567830A JP14177278A JP14177278A JPS5567830A JP S5567830 A JPS5567830 A JP S5567830A JP 14177278 A JP14177278 A JP 14177278A JP 14177278 A JP14177278 A JP 14177278A JP S5567830 A JPS5567830 A JP S5567830A
Authority
JP
Japan
Prior art keywords
circuit
key
output
pressed
key signal
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
JP14177278A
Other languages
Japanese (ja)
Other versions
JPS5818650B2 (en
Inventor
Takemi Yamamoto
Noriiku Makino
Hisao Hachisuga
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.)
Brother Industries Ltd
Original Assignee
Brother Industries 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 Brother Industries Ltd filed Critical Brother Industries Ltd
Priority to JP53141772A priority Critical patent/JPS5818650B2/en
Publication of JPS5567830A publication Critical patent/JPS5567830A/en
Publication of JPS5818650B2 publication Critical patent/JPS5818650B2/en
Expired legal-status Critical Current

Links

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  • Input From Keyboards Or The Like (AREA)

Abstract

PURPOSE: To avoid the output of the key signal which is not pressed by inhibiting the output operation for the key signal via the output circuit for the period during which more than two units of key switches are pressed at one time.
CONSTITUTION: Scanning circuit 6 selects in the time-division way both the column and row lines of matrix circuit 5 to detect the pressing operation of each key, and then delivers 7 the fixed encoded key signal according to the detection contents. Here memory circuit 8 memorizes the number of the units of the key switches pressed instantaneously in response to the detecting action of circuit 6. And the output action of the key signal is inhibited at circuit 7 for the period during which more than two key switches are pressed simultaneously via control circuit 9. As a result, the output can be avoided for the key signal corresponding to the key switch which is not pressed under the connection state of circuit 5.
COPYRIGHT: (C)1980,JPO&Japio
JP53141772A 1978-11-16 1978-11-16 keyboard input device Expired JPS5818650B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53141772A JPS5818650B2 (en) 1978-11-16 1978-11-16 keyboard input device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53141772A JPS5818650B2 (en) 1978-11-16 1978-11-16 keyboard input device

Publications (2)

Publication Number Publication Date
JPS5567830A true JPS5567830A (en) 1980-05-22
JPS5818650B2 JPS5818650B2 (en) 1983-04-14

Family

ID=15299808

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53141772A Expired JPS5818650B2 (en) 1978-11-16 1978-11-16 keyboard input device

Country Status (1)

Country Link
JP (1) JPS5818650B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5725876A (en) * 1980-07-24 1982-02-10 Sofuia Kk Device for successively stopping coin game machine
JPS57164326A (en) * 1981-03-31 1982-10-08 Omron Tateisi Electronics Co Key input device
JPS58112129A (en) * 1981-12-24 1983-07-04 Tokyo Electric Co Ltd Key signal input system for 1-chip microcomputer
JPS62154124A (en) * 1985-12-27 1987-07-09 Okuma Mach Works Ltd Switch input system
JPS6312224U (en) * 1987-06-24 1988-01-27
JPS6488617A (en) * 1987-09-29 1989-04-03 Fujitsu Ltd Key-detection processor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5154332A (en) * 1974-11-07 1976-05-13 Tokyo Electric Co Ltd
JPS5253629A (en) * 1975-10-24 1977-04-30 Tektronix Inc Keyboard device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5154332A (en) * 1974-11-07 1976-05-13 Tokyo Electric Co Ltd
JPS5253629A (en) * 1975-10-24 1977-04-30 Tektronix Inc Keyboard device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5725876A (en) * 1980-07-24 1982-02-10 Sofuia Kk Device for successively stopping coin game machine
JPS6332469B2 (en) * 1980-07-24 1988-06-30 Sophia Co Ltd
JPS57164326A (en) * 1981-03-31 1982-10-08 Omron Tateisi Electronics Co Key input device
JPS6311691B2 (en) * 1981-03-31 1988-03-15 Omron Tateisi Electronics Co
JPS58112129A (en) * 1981-12-24 1983-07-04 Tokyo Electric Co Ltd Key signal input system for 1-chip microcomputer
JPS62154124A (en) * 1985-12-27 1987-07-09 Okuma Mach Works Ltd Switch input system
JPS6312224U (en) * 1987-06-24 1988-01-27
JPS6488617A (en) * 1987-09-29 1989-04-03 Fujitsu Ltd Key-detection processor

Also Published As

Publication number Publication date
JPS5818650B2 (en) 1983-04-14

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