JPS54111297A - Compound crystal oscillator - Google Patents

Compound crystal oscillator

Info

Publication number
JPS54111297A
JPS54111297A JP1881078A JP1881078A JPS54111297A JP S54111297 A JPS54111297 A JP S54111297A JP 1881078 A JP1881078 A JP 1881078A JP 1881078 A JP1881078 A JP 1881078A JP S54111297 A JPS54111297 A JP S54111297A
Authority
JP
Japan
Prior art keywords
frequency
crystal oscillator
oscillator
constant
approximately
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
JP1881078A
Other languages
Japanese (ja)
Inventor
Hideo Hoshi
Koichi Teruyama
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 JP1881078A priority Critical patent/JPS54111297A/en
Publication of JPS54111297A publication Critical patent/JPS54111297A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
    • H03H9/21—Crystal tuning forks

Abstract

PURPOSE:To increase the low temperature coefficient temperature without changing the overall size as well as to employ for high precision electronic wrist watch by oscillating the crystal oscillators of compound crystal oscillator in the secondary higher harmonic mode. CONSTITUTION:Compound crystal oscillator made up of two crystal oscillators of different frequency temperature characteristic connected electrically in parallel is provided. The resonance frequency of this crystal oscillator is shown by a formula which is in proportion to r<2> w/l<2> where w, l and r are the width, length and constant of oscillating arm, respectively. In case of the fundamental oscillation, constant r is approximately r1=0.9375 and in case of the secondary high frequency, it is approximately r2=2.347. This tuning fork type oscillator is oscillated by the secondary r1 to r2 and, therefore, when width w of oscillating arm is constant, the side ratio w/l becomes equal to r2/r1, thus enabling to obtain frequency approximately 2.5 times more than the side ratio. The same arrangement can be applied to the frequency-temperature characteristic, that is, by using the secondary high freqnency, the side-ratio can be increased approxmiately 2.5 times without changing the size of oscillator, thus enabling to extensively increase the low temperature coefficient temperature.
JP1881078A 1978-02-21 1978-02-21 Compound crystal oscillator Pending JPS54111297A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1881078A JPS54111297A (en) 1978-02-21 1978-02-21 Compound crystal oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1881078A JPS54111297A (en) 1978-02-21 1978-02-21 Compound crystal oscillator

Publications (1)

Publication Number Publication Date
JPS54111297A true JPS54111297A (en) 1979-08-31

Family

ID=11981937

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1881078A Pending JPS54111297A (en) 1978-02-21 1978-02-21 Compound crystal oscillator

Country Status (1)

Country Link
JP (1) JPS54111297A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4356425A (en) * 1979-02-20 1982-10-26 Kabushiki Kaisha Suwa Seikosha Electrode for tuning fork type quartz crystal vibrator
US4415827A (en) * 1981-05-27 1983-11-15 Statek Corporation Microresonator of tuning fork configuration operating at its second overtone frequency

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4356425A (en) * 1979-02-20 1982-10-26 Kabushiki Kaisha Suwa Seikosha Electrode for tuning fork type quartz crystal vibrator
US4415827A (en) * 1981-05-27 1983-11-15 Statek Corporation Microresonator of tuning fork configuration operating at its second overtone frequency

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