JPS5720026A - Touch switch circuit - Google Patents

Touch switch circuit

Info

Publication number
JPS5720026A
JPS5720026A JP9479380A JP9479380A JPS5720026A JP S5720026 A JPS5720026 A JP S5720026A JP 9479380 A JP9479380 A JP 9479380A JP 9479380 A JP9479380 A JP 9479380A JP S5720026 A JPS5720026 A JP S5720026A
Authority
JP
Japan
Prior art keywords
switch
closed
opened
switches
hold
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
JP9479380A
Other languages
Japanese (ja)
Other versions
JPH0324097B2 (en
Inventor
Makoto Kondo
Kenji Furuta
Hiroshi Ooya
Yoshio Tomizawa
Akiteru Kimura
Hajime Osada
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.)
Olympus Corp
Original Assignee
Olympus Optical 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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP9479380A priority Critical patent/JPS5720026A/en
Publication of JPS5720026A publication Critical patent/JPS5720026A/en
Publication of JPH0324097B2 publication Critical patent/JPH0324097B2/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
    • H03M11/02—Details

Landscapes

  • Electronic Switches (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)

Abstract

PURPOSE:To prevent erroneous operation due to the forgetful nonclosure of a hold switch, by providing a display element for the confirmation of the operation state of the hold switch. CONSTITUTION:For normal operation, a hold switch 15 is closed and touch switches 11-13 are closed optionally. When one of the switches 11-13 is closed, a potential at a corresponding input terminal of a key controller 14 varies and this potential variations are latched by the controller 14 to set a selected mode. In this state, opening the switch 15 turns on a transistor 22 to turn on a light emitting element 21. Then, the switch 15 is found opened by confirming the turning-on of this element 21. When this switch 15 is opened, an operation mode never changes even if another touch switch is closed, so that any malfunction does not occur.
JP9479380A 1980-07-11 1980-07-11 Touch switch circuit Granted JPS5720026A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9479380A JPS5720026A (en) 1980-07-11 1980-07-11 Touch switch circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9479380A JPS5720026A (en) 1980-07-11 1980-07-11 Touch switch circuit

Publications (2)

Publication Number Publication Date
JPS5720026A true JPS5720026A (en) 1982-02-02
JPH0324097B2 JPH0324097B2 (en) 1991-04-02

Family

ID=14119945

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9479380A Granted JPS5720026A (en) 1980-07-11 1980-07-11 Touch switch circuit

Country Status (1)

Country Link
JP (1) JPS5720026A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS612419A (en) * 1984-06-15 1986-01-08 Toshiba Corp Switching circuit
JPH0340987U (en) * 1989-08-21 1991-04-19

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5586029A (en) * 1978-12-22 1980-06-28 Janome Sewing Machine Co Ltd Touch switch

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5586029A (en) * 1978-12-22 1980-06-28 Janome Sewing Machine Co Ltd Touch switch

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS612419A (en) * 1984-06-15 1986-01-08 Toshiba Corp Switching circuit
JPH0340987U (en) * 1989-08-21 1991-04-19

Also Published As

Publication number Publication date
JPH0324097B2 (en) 1991-04-02

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