JPS54109878A - Electronic watch with solar batteries - Google Patents

Electronic watch with solar batteries

Info

Publication number
JPS54109878A
JPS54109878A JP1735478A JP1735478A JPS54109878A JP S54109878 A JPS54109878 A JP S54109878A JP 1735478 A JP1735478 A JP 1735478A JP 1735478 A JP1735478 A JP 1735478A JP S54109878 A JPS54109878 A JP S54109878A
Authority
JP
Japan
Prior art keywords
circuit
oscillation
high voltage
channel mos
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.)
Pending
Application number
JP1735478A
Other languages
Japanese (ja)
Inventor
Takehiro Ishikawa
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 JP1735478A priority Critical patent/JPS54109878A/en
Publication of JPS54109878A publication Critical patent/JPS54109878A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F5/00—Apparatus for producing preselected time intervals for use as timing standards
    • G04F5/04—Apparatus for producing preselected time intervals for use as timing standards using oscillators with electromechanical resonators producing electric oscillations or timing pulses
    • G04F5/06—Apparatus for producing preselected time intervals for use as timing standards using oscillators with electromechanical resonators producing electric oscillations or timing pulses using piezoelectric resonators

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Electric Clocks (AREA)
  • Electromechanical Clocks (AREA)

Abstract

PURPOSE:To prevent the fluctuations of oscillation frequency at the high voltage and prevent the time deviation of the crystal oscillation type electronic watch by performing changing-over of an oscillation frequency adjusting capacitor in a crystal oscillation circuit according to the results of the detection of a high voltage detection circuit. CONSTITUTION:When a silver battery 43 is at 1.57V, an overcharging preventing circuit 42 opens and the charging current is supplied from solar batteries 41. The P channel MOS 44f and N channel MOS 44c in a high voltage detection circuit 44 go ON according to the sampling pulses from a time counter circuit 47. At the time when the silver battery 43 is at 1.57V, the ON resistance of the P channel MOS 44f is large and the oscillation capacitor 46j in a crystal oscillation circuit 46 is used but when the silver battery 43 becomes 1.8V, the overcharging preventing circuit 42 closes to cut off the charging current and at the same time the ON resistance of the PMOS 44f becomes small and the oscillation capacitor 46j in the crystal oscillation circuit 46 is used, whereby the fluctuations of the oscillation frequency may be prevented.
JP1735478A 1978-02-17 1978-02-17 Electronic watch with solar batteries Pending JPS54109878A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1735478A JPS54109878A (en) 1978-02-17 1978-02-17 Electronic watch with solar batteries

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1735478A JPS54109878A (en) 1978-02-17 1978-02-17 Electronic watch with solar batteries

Publications (1)

Publication Number Publication Date
JPS54109878A true JPS54109878A (en) 1979-08-28

Family

ID=11941702

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1735478A Pending JPS54109878A (en) 1978-02-17 1978-02-17 Electronic watch with solar batteries

Country Status (1)

Country Link
JP (1) JPS54109878A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61247993A (en) * 1985-04-26 1986-11-05 Seiko Epson Corp Electronic timepiece
EP0449601A2 (en) * 1990-03-27 1991-10-02 Nec Corporation Crystal oscillator for use in timepiece of battery-powered portable apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61247993A (en) * 1985-04-26 1986-11-05 Seiko Epson Corp Electronic timepiece
EP0449601A2 (en) * 1990-03-27 1991-10-02 Nec Corporation Crystal oscillator for use in timepiece of battery-powered portable apparatus

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