JPS57132233A - Keyboard device - Google Patents

Keyboard device

Info

Publication number
JPS57132233A
JPS57132233A JP56017198A JP1719881A JPS57132233A JP S57132233 A JPS57132233 A JP S57132233A JP 56017198 A JP56017198 A JP 56017198A JP 1719881 A JP1719881 A JP 1719881A JP S57132233 A JPS57132233 A JP S57132233A
Authority
JP
Japan
Prior art keywords
circuit
certain time
keyboard
power
capacitor
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
JP56017198A
Other languages
Japanese (ja)
Other versions
JPS6230448B2 (en
Inventor
Mikio Nozu
Yoshikazu Yoshikawa
Masaaki Tanio
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP56017198A priority Critical patent/JPS57132233A/en
Publication of JPS57132233A publication Critical patent/JPS57132233A/en
Publication of JPS6230448B2 publication Critical patent/JPS6230448B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/24—Resetting means

Abstract

PURPOSE:To operate the switches of a keyboard device safely and securely, by providing a capacitor which makes a current flow for a certain time when the power is supplied, a fixed resistor which is selected to reach a prescribed voltage a certain time later, and a level detector. CONSTITUTION:A capacitor 1 flows a current when the power is supplied and a resistor 2 is selected to reach a prescribed voltage a certain time later; and a level detecting circuit 3, when powered up, generates an output for a certain time. A switch scanning circuit 4 sends a signal only in the direction X of a keyboard 8 with time, and an encoder circuit 11 detects and encodes contact states in the direction Y of the keyboard 8. Then, an OR circuit 9 ANDs contact outputs in the direction Y, and an AND circuit 10 permits the AND output to pass itself only for the certain time of power feeding, and it is stored and held as a trigger signal for a holding circuit 12. For example, if some switch on the keyboard 8 is pressed abnormally during the power feeding, the circuit 11 is reset and other circuits are all stopped from operating.
JP56017198A 1981-02-06 1981-02-06 Keyboard device Granted JPS57132233A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56017198A JPS57132233A (en) 1981-02-06 1981-02-06 Keyboard device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56017198A JPS57132233A (en) 1981-02-06 1981-02-06 Keyboard device

Publications (2)

Publication Number Publication Date
JPS57132233A true JPS57132233A (en) 1982-08-16
JPS6230448B2 JPS6230448B2 (en) 1987-07-02

Family

ID=11937233

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56017198A Granted JPS57132233A (en) 1981-02-06 1981-02-06 Keyboard device

Country Status (1)

Country Link
JP (1) JPS57132233A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5936888A (en) * 1982-08-26 1984-02-29 富士電機株式会社 Trouble diagnosing equipment for vending machine control unit input circuit
WO2001095498A1 (en) * 2000-06-02 2001-12-13 Thomson Licensing S.A. Prevention of incompatible keyboard selections from being entered during power initialization

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5936888A (en) * 1982-08-26 1984-02-29 富士電機株式会社 Trouble diagnosing equipment for vending machine control unit input circuit
WO2001095498A1 (en) * 2000-06-02 2001-12-13 Thomson Licensing S.A. Prevention of incompatible keyboard selections from being entered during power initialization
JP2003536158A (en) * 2000-06-02 2003-12-02 トムソン ライセンシング ソシエテ アノニム Control system to prevent incompatible keys from being selected and entered during power-up
JP4766538B2 (en) * 2000-06-02 2011-09-07 トムソン ライセンシング A control system that prevents incompatible keys from being selected and entered during power-up
DE10196251B3 (en) * 2000-06-02 2016-02-11 Thomson Licensing S.A. Suppression of invalid keystrokes during the switch-on process

Also Published As

Publication number Publication date
JPS6230448B2 (en) 1987-07-02

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