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JPS52143071A - Brightness modulation circuit for electronic timepiece - Google Patents

Brightness modulation circuit for electronic timepiece

Info

Publication number
JPS52143071A
JPS52143071A JP6143876A JP6143876A JPS52143071A JP S52143071 A JPS52143071 A JP S52143071A JP 6143876 A JP6143876 A JP 6143876A JP 6143876 A JP6143876 A JP 6143876A JP S52143071 A JPS52143071 A JP S52143071A
Authority
JP
Japan
Prior art keywords
modulation circuit
electronic timepiece
brightness modulation
brightness
resistance
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
JP6143876A
Other languages
Japanese (ja)
Inventor
Hiroshi Yoshino
Kazuo Izumida
Tatsushi Kato
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.)
Tokyo Sanyo Electric Co Ltd
Sanyo Electric Co Ltd
Original Assignee
Tokyo Sanyo Electric Co Ltd
Sanyo Electric 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 Tokyo Sanyo Electric Co Ltd, Sanyo Electric Co Ltd filed Critical Tokyo Sanyo Electric Co Ltd
Priority to JP6143876A priority Critical patent/JPS52143071A/en
Publication of JPS52143071A publication Critical patent/JPS52143071A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G9/00—Visual time or date indication means
    • G04G9/0017—Visual time or date indication means in which the light emitting display elements may be activated at will or are controlled in accordance with the ambient light

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Electric Clocks (AREA)
  • Indicating Measured Values (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

PURPOSE:To modulate the brightness of an indication element under the brightness of ambient light by connecting a resistance with a volume in series and connecting a phototransistor at the both ends of a resistance and reducing current consumption so that the light of a battery may become longer.
JP6143876A 1976-05-24 1976-05-24 Brightness modulation circuit for electronic timepiece Pending JPS52143071A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6143876A JPS52143071A (en) 1976-05-24 1976-05-24 Brightness modulation circuit for electronic timepiece

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6143876A JPS52143071A (en) 1976-05-24 1976-05-24 Brightness modulation circuit for electronic timepiece

Publications (1)

Publication Number Publication Date
JPS52143071A true JPS52143071A (en) 1977-11-29

Family

ID=13171060

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6143876A Pending JPS52143071A (en) 1976-05-24 1976-05-24 Brightness modulation circuit for electronic timepiece

Country Status (1)

Country Link
JP (1) JPS52143071A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60177395A (en) * 1984-02-24 1985-09-11 財団法人日本交通管理技術協会 Information display unit
JPS636489U (en) * 1986-06-30 1988-01-16

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60177395A (en) * 1984-02-24 1985-09-11 財団法人日本交通管理技術協会 Information display unit
JPS636489U (en) * 1986-06-30 1988-01-16

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