GB1450237A - Electric timepieces - Google Patents

Electric timepieces

Info

Publication number
GB1450237A
GB1450237A GB2243174A GB2243174A GB1450237A GB 1450237 A GB1450237 A GB 1450237A GB 2243174 A GB2243174 A GB 2243174A GB 2243174 A GB2243174 A GB 2243174A GB 1450237 A GB1450237 A GB 1450237A
Authority
GB
United Kingdom
Prior art keywords
room temperature
curie point
normal room
electric timepieces
timepiece
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.)
Expired
Application number
GB2243174A
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.)
Suwa Seikosha KK
Original Assignee
Suwa Seikosha KK
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 Suwa Seikosha KK filed Critical Suwa Seikosha KK
Publication of GB1450237A publication Critical patent/GB1450237A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L1/00—Stabilisation of generator output against variations of physical values, e.g. power supply
    • H03L1/02—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only
    • H03L1/028—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only of generators comprising piezoelectric resonators
    • 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)
  • Oscillators With Electromechanical Resonators (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)

Abstract

1450237 Electronic timepieces SUWA SEIKOSHA KK 20 May 1974 [21 May 1973] 22431/74 Heading G3T [Also in Division H3] A timepiece using as frequency standard a Piezo-electric crystal other than GT or AT cut and having a substantially zero temperature/frequency characteristic at normal room temperature is compensated by means of a ceramic capacitor having its Curie point at normal room temperature and a change rate of at least 30% for temperatures of substantially 20‹C above and below the Curie point. Suitable materials are given by way of example.
GB2243174A 1973-05-21 1974-05-20 Electric timepieces Expired GB1450237A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5656873A JPS508451A (en) 1973-05-21 1973-05-21

Publications (1)

Publication Number Publication Date
GB1450237A true GB1450237A (en) 1976-09-22

Family

ID=13030727

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2243174A Expired GB1450237A (en) 1973-05-21 1974-05-20 Electric timepieces

Country Status (3)

Country Link
JP (1) JPS508451A (en)
GB (1) GB1450237A (en)
HK (1) HK65080A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5424601A (en) * 1990-08-03 1995-06-13 U.S. Philips Corporation Temperature stabilized crystal oscillator
GB2307120A (en) * 1995-11-07 1997-05-14 Nec Corp Quartz oscillator with compensation of frequency variation with temperature using a temperature varying capacitor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5248875B2 (en) * 1972-01-07 1977-12-13

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4314672Y1 (en) * 1965-06-02 1968-06-20

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5424601A (en) * 1990-08-03 1995-06-13 U.S. Philips Corporation Temperature stabilized crystal oscillator
GB2307120A (en) * 1995-11-07 1997-05-14 Nec Corp Quartz oscillator with compensation of frequency variation with temperature using a temperature varying capacitor
GB2307120B (en) * 1995-11-07 1999-02-10 Nec Corp Quartz oscillator
US5952894A (en) * 1995-11-07 1999-09-14 Nec Corporation Resonant circuit having a reactance for temperature compensation

Also Published As

Publication number Publication date
HK65080A (en) 1980-11-28
JPS508451A (en) 1975-01-28

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19940519