JPS5614335A - Key input device - Google Patents

Key input device

Info

Publication number
JPS5614335A
JPS5614335A JP8899379A JP8899379A JPS5614335A JP S5614335 A JPS5614335 A JP S5614335A JP 8899379 A JP8899379 A JP 8899379A JP 8899379 A JP8899379 A JP 8899379A JP S5614335 A JPS5614335 A JP S5614335A
Authority
JP
Japan
Prior art keywords
key
input
keys
signal
depressed
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
JP8899379A
Other languages
Japanese (ja)
Other versions
JPS6319886B2 (en
Inventor
Hiroshi Yabe
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.)
Seiko Epson Corp
Suwa Seikosha KK
Original Assignee
Seiko Epson Corp
Suwa Seikosha KK
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 Seiko Epson Corp, Suwa Seikosha KK filed Critical Seiko Epson Corp
Priority to JP8899379A priority Critical patent/JPS5614335A/en
Publication of JPS5614335A publication Critical patent/JPS5614335A/en
Publication of JPS6319886B2 publication Critical patent/JPS6319886B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Input From Keyboards Or The Like (AREA)

Abstract

PURPOSE: To make a circuit small-size and lightweight to prevent the circuit from being complicated, by detecting a new input key even if plural keys are depressed simultaneously.
CONSTITUTION: Output port 5 performs input control of keys with driving of lines of keyboard 8, and input ports 6 and 7 perform key detection of respective columns for every 8 bits in this case. These ports are so grounded that signal line COM and the column where no key is depressed may be low-potential surely when no signal is flowed. A diode is inserted to each signal line COM so that the signal can be prevented from being flowed reversely through signal line COM, which does not output the signal to port 5, when keys in the same column are depressed simultaneously. Further, in respect of the column where the shift key and the repeat key are added, key detection is input to processor 1 through no ports 6 and 7 so that it may be prevented from being decided as a new key input when only these keys are depressed. As a result, a new input key is detected, so that the circuit can be small- size and lightweight and can be prevented from being complicated.
COPYRIGHT: (C)1981,JPO&Japio
JP8899379A 1979-07-13 1979-07-13 Key input device Granted JPS5614335A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8899379A JPS5614335A (en) 1979-07-13 1979-07-13 Key input device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8899379A JPS5614335A (en) 1979-07-13 1979-07-13 Key input device

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP1058919A Division JPH01271820A (en) 1989-03-10 1989-03-10 Key input device

Publications (2)

Publication Number Publication Date
JPS5614335A true JPS5614335A (en) 1981-02-12
JPS6319886B2 JPS6319886B2 (en) 1988-04-25

Family

ID=13958329

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8899379A Granted JPS5614335A (en) 1979-07-13 1979-07-13 Key input device

Country Status (1)

Country Link
JP (1) JPS5614335A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57164326A (en) * 1981-03-31 1982-10-08 Omron Tateisi Electronics Co Key input device
JPS57174732A (en) * 1981-04-21 1982-10-27 Sharp Corp Key input device
JPS61213913A (en) * 1985-03-19 1986-09-22 Sony Corp Keyboard device
JPH05197468A (en) * 1992-08-28 1993-08-06 Seiko Epson Corp Key input method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5092641A (en) * 1973-12-14 1975-07-24
JPS5323044A (en) * 1976-08-16 1978-03-03 Toshiba Corp Switchboard
JPS5357702U (en) * 1976-10-18 1978-05-17

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5092641A (en) * 1973-12-14 1975-07-24
JPS5323044A (en) * 1976-08-16 1978-03-03 Toshiba Corp Switchboard
JPS5357702U (en) * 1976-10-18 1978-05-17

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JPS57174732A (en) * 1981-04-21 1982-10-27 Sharp Corp Key input device
JPH0254581B2 (en) * 1981-04-21 1990-11-22 Sharp Kk
JPS61213913A (en) * 1985-03-19 1986-09-22 Sony Corp Keyboard device
JPH05197468A (en) * 1992-08-28 1993-08-06 Seiko Epson Corp Key input method

Also Published As

Publication number Publication date
JPS6319886B2 (en) 1988-04-25

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