JPS5491376A - Electronic watch - Google Patents

Electronic watch

Info

Publication number
JPS5491376A
JPS5491376A JP15837777A JP15837777A JPS5491376A JP S5491376 A JPS5491376 A JP S5491376A JP 15837777 A JP15837777 A JP 15837777A JP 15837777 A JP15837777 A JP 15837777A JP S5491376 A JPS5491376 A JP S5491376A
Authority
JP
Japan
Prior art keywords
temperature
quartz oscillator
circuit
turned
signals
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
JP15837777A
Other languages
Japanese (ja)
Inventor
Mitsuo Iwadate
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 JP15837777A priority Critical patent/JPS5491376A/en
Publication of JPS5491376A publication Critical patent/JPS5491376A/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)
  • Electric Clocks (AREA)

Abstract

PURPOSE:To reduce the influence from temperature to hold stable accuracy by connecting at least two quartz oscillators having differenct temperature characteristics with one oscillatory circuit and by selecting the oscillators with a change-over switch. CONSTITUTION:Normally, a quartz oscillator Q2 for higher temperature is selected and operated by a switch circuit 2. Once the temperature is lowered, a temperature detecting circuit 3 detects the temperature to feed its signals to the switch circuit 2. In response to these signals, the quartz oscillator Q2 is turned off whereas a quartz oscillator Q1 for lower temperature is turned on. Thus, the disturbances in the frequency due to the low temperature are prevented to hold the stable accuracy.
JP15837777A 1977-12-28 1977-12-28 Electronic watch Pending JPS5491376A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15837777A JPS5491376A (en) 1977-12-28 1977-12-28 Electronic watch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15837777A JPS5491376A (en) 1977-12-28 1977-12-28 Electronic watch

Publications (1)

Publication Number Publication Date
JPS5491376A true JPS5491376A (en) 1979-07-19

Family

ID=15670363

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15837777A Pending JPS5491376A (en) 1977-12-28 1977-12-28 Electronic watch

Country Status (1)

Country Link
JP (1) JPS5491376A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0443023U (en) * 1990-08-13 1992-04-13

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0443023U (en) * 1990-08-13 1992-04-13

Similar Documents

Publication Publication Date Title
JPS5491376A (en) Electronic watch
JPS5255361A (en) Variable frequency oscillator
JPS5320845A (en) Quartz crystal watch
JPS5739616A (en) Tristate gate type oscillation circuit
JPS538005A (en) Frequency mixer
JPS5412692A (en) Tuning fork type crystal oscillator for watch use
JPS5249711A (en) Synthesizer tuner
JPS5328465A (en) Electronic watch
JPS5619484A (en) Electronic timepiece equipped with temperature compensating circuit
JPS57116287A (en) Electronic watch
JPS51142252A (en) Exciter circuit
JPS5337310A (en) Automatic frequency control circuit
JPS5275211A (en) Delta tune circuit
JPS5326556A (en) Astable mult ivibrator
JPS5336193A (en) Piezoelectric vibrator
JPS52150925A (en) Frequency control unit
JPS5485770A (en) Electronic watch with temperature compensation
JPS5619482A (en) Electronic timepiece equipped with temperature compensating circuit
JPS5423571A (en) Electronic wristwatch with alarm
JPS55134531A (en) Automatic frequency control system
JPS51149755A (en) Electronic clock
FR2342519B3 (en)
JPS55135428A (en) Pll frequency synthesizer device
JPS5549047A (en) Fm receiver
JPS5346776A (en) Electronic watch