GB1387010A - Timepiece - Google Patents

Timepiece

Info

Publication number
GB1387010A
GB1387010A GB2987772A GB2987772A GB1387010A GB 1387010 A GB1387010 A GB 1387010A GB 2987772 A GB2987772 A GB 2987772A GB 2987772 A GB2987772 A GB 2987772A GB 1387010 A GB1387010 A GB 1387010A
Authority
GB
United Kingdom
Prior art keywords
oscillator
frequency
watch
output
temperature
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
GB2987772A
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.)
Citizen Watch Co Ltd
Original Assignee
Citizen Watch 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 Citizen Watch Co Ltd filed Critical Citizen Watch Co Ltd
Priority to GB2987772A priority Critical patent/GB1387010A/en
Publication of GB1387010A publication Critical patent/GB1387010A/en
Expired 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
    • G04F5/063—Constructional details

Landscapes

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

Abstract

1387010 Transistor oscillator circuits CITIZEN WATCH CO Ltd 26 June 1972 29877/72 Heading H3T [Also in Divisions G3 and H1] An oscillator circuit for a timepiece employs a piezo-electric bar 611<SP>1</SP> and transistors 201, 204 in the emitter follower and common emitter modes respectively. Coarse and fine adjustment of the oscillator frequency is permitted by capacitors 216, 212. A feedback loop includes a thermistor 213 in parallel with a capacitor 214 and is arranged to minimize the variation of output frequency with temperature (Fig. 18, not shown). The amplifier input impedance may be adjusted by means of resistor 203, to change the effectiveness of the temperature compensation circuit (Fig. 17, not shown). The oscillator output at terminal 219 is fed to a frequency divider and drives a watch train.
GB2987772A 1972-06-26 1972-06-26 Timepiece Expired GB1387010A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2987772A GB1387010A (en) 1972-06-26 1972-06-26 Timepiece

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2987772A GB1387010A (en) 1972-06-26 1972-06-26 Timepiece

Publications (1)

Publication Number Publication Date
GB1387010A true GB1387010A (en) 1975-03-12

Family

ID=10298646

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2987772A Expired GB1387010A (en) 1972-06-26 1972-06-26 Timepiece

Country Status (1)

Country Link
GB (1) GB1387010A (en)

Similar Documents

Publication Publication Date Title
GB1481630A (en) Variable frequency oscillators
GB1512466A (en) Oscillators
GB1429257A (en) Timepiece having a high frequency oxcillator
GB1498140A (en) Square wave generating circuit
GB1005548A (en) Frequency control of oscillators
US3585527A (en) Oscillator circuit including a quartz crystal operating in parallel resonance
GB1387010A (en) Timepiece
GB1021490A (en) Regulated oscillator circuit
GB1243127A (en) Oscillator circuit including a quartz crystal operating in parallel resonance
AU521091B2 (en) Frequency divider
GB1034592A (en) Stabilized transistor oscillators
ES410071A1 (en) Integrated circuit for electronic timepieces
CH610486GA3 (en)
GB1183805A (en) Improvements relating to Oscillators.
GB1349697A (en) Quartz oscillator more especially for a clock drive
GB1240070A (en) Electronic circuit for driving a mechanical oscillating system
GB1280104A (en) Circuit for regulating the mean frequency of an oscillating system
GB1090760A (en) Improvements in or relating to frequency modulated oscillator circuits
GB1098016A (en) Improvements in or relating to circuit arrangements for synchronising relaxation oscillators
GB1235245A (en) Electronic watch
GB1077877A (en) Improvements in crystal oscillators
GB1117092A (en) Improvements in oscillator circuits
GB1141755A (en) Frequency controlled quartz oscillator
GB1245163A (en) Multiterminal networks
GB1101177A (en) Improvements in or relating to transistor driven piezo-electric crystal oscillators

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee