JPS51123522A - Key input circuit - Google Patents

Key input circuit

Info

Publication number
JPS51123522A
JPS51123522A JP50047554A JP4755475A JPS51123522A JP S51123522 A JPS51123522 A JP S51123522A JP 50047554 A JP50047554 A JP 50047554A JP 4755475 A JP4755475 A JP 4755475A JP S51123522 A JPS51123522 A JP S51123522A
Authority
JP
Japan
Prior art keywords
keys
input circuit
key input
information input
touch
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.)
Pending
Application number
JP50047554A
Other languages
Japanese (ja)
Inventor
Hiroyasu Nomiya
Shuichi Torii
Hideo Hara
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP50047554A priority Critical patent/JPS51123522A/en
Priority to DE19762616648 priority patent/DE2616648A1/en
Priority to NL7604183A priority patent/NL7604183A/en
Publication of JPS51123522A publication Critical patent/JPS51123522A/en
Pending 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

Abstract

PURPOSE: To prevent incorrect lock key operation caused by doubled touch key depression on input keys in a device like a pocket calculator equipped with touch keys (for value and function information input purpose) and lock keys (for decimal information input purpose).
COPYRIGHT: (C)1976,JPO&Japio
JP50047554A 1975-04-21 1975-04-21 Key input circuit Pending JPS51123522A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP50047554A JPS51123522A (en) 1975-04-21 1975-04-21 Key input circuit
DE19762616648 DE2616648A1 (en) 1975-04-21 1976-04-15 CIRCUIT FOR KEYBOARD FEEDING INFORMATION - by use of input annaand locking keys uses timing pulses on multiplex principle operated by integrated semiconductor logic
NL7604183A NL7604183A (en) 1975-04-21 1976-04-20 KEY INPUT CHAIN FOR USE IN ELECTRONIC EQUIPMENT.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50047554A JPS51123522A (en) 1975-04-21 1975-04-21 Key input circuit

Publications (1)

Publication Number Publication Date
JPS51123522A true JPS51123522A (en) 1976-10-28

Family

ID=12778381

Family Applications (1)

Application Number Title Priority Date Filing Date
JP50047554A Pending JPS51123522A (en) 1975-04-21 1975-04-21 Key input circuit

Country Status (3)

Country Link
JP (1) JPS51123522A (en)
DE (1) DE2616648A1 (en)
NL (1) NL7604183A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5399725A (en) * 1977-02-10 1978-08-31 Shaken Kk Keyboard

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2616240B1 (en) * 1987-06-05 1990-10-26 Thomson Csf METHOD AND DEVICE FOR ANALYZING THE CONDITIONS OF A CONTROL PANEL BY A MICROPROCESSOR

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49126224A (en) * 1973-04-03 1974-12-03

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49126224A (en) * 1973-04-03 1974-12-03

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5399725A (en) * 1977-02-10 1978-08-31 Shaken Kk Keyboard

Also Published As

Publication number Publication date
NL7604183A (en) 1976-10-25
DE2616648A1 (en) 1976-11-11

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