JPS55135778A - Electronic watch - Google Patents

Electronic watch

Info

Publication number
JPS55135778A
JPS55135778A JP4331579A JP4331579A JPS55135778A JP S55135778 A JPS55135778 A JP S55135778A JP 4331579 A JP4331579 A JP 4331579A JP 4331579 A JP4331579 A JP 4331579A JP S55135778 A JPS55135778 A JP S55135778A
Authority
JP
Japan
Prior art keywords
lamp
battery
power supply
watch circuit
illumination
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
JP4331579A
Other languages
Japanese (ja)
Inventor
Masayuki Sasaki
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 Instruments Inc
Original Assignee
Seiko Instruments Inc
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 Instruments Inc filed Critical Seiko Instruments Inc
Priority to JP4331579A priority Critical patent/JPS55135778A/en
Publication of JPS55135778A publication Critical patent/JPS55135778A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G19/00—Electric power supply circuits specially adapted for use in electronic time-pieces
    • G04G19/08—Arrangements for preventing voltage drop due to overloading the power supply

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

PURPOSE:To prevent the inconvenience of circuit operation accompanied with the power supply voltage drop at lamp illumination, by performing the power supply to the watch circuit at lamp illumination with the capacitor connected in parallel with the battery. CONSTITUTION:Normally, the negative output of Q4 of R-S flip-flop (F.F) 11 is level 1, and the N channel transistor 21 is ON and the battery 5 is connected as the power supply of the watch circuit. When the switch 2 is depressed for the illumination of the lamp 4, the negative output of Q4 of R-S F.F11 is changed to level 0, and the channel transistor 21 is OFF, and the battery 5 is disconnected from the watch circuit. Further, while a rush current flows to the lamp 4, the transistor 21 is OFF and the current flows to the watch circuit from the capacitor 22.
JP4331579A 1979-04-10 1979-04-10 Electronic watch Pending JPS55135778A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4331579A JPS55135778A (en) 1979-04-10 1979-04-10 Electronic watch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4331579A JPS55135778A (en) 1979-04-10 1979-04-10 Electronic watch

Publications (1)

Publication Number Publication Date
JPS55135778A true JPS55135778A (en) 1980-10-22

Family

ID=12660365

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4331579A Pending JPS55135778A (en) 1979-04-10 1979-04-10 Electronic watch

Country Status (1)

Country Link
JP (1) JPS55135778A (en)

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