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US RE29,429 EGranted
Oscillator for a timepiece
AssigneeKabushiki Kaisha Suwa Seikosha
InventorsMasanori Kawai, Haruo Takada, Shinkichi Kobayashi
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AssigneeKabushiki Kaisha Suwa Seikosha
InventorsMasanori Kawai, Haruo Takada, Shinkichi Kobayashi
Estimating the term…
An improved, compact, impact-resistant quartz crystal oscillator is provided for a timepiece. The oscillator comprises a substantially flat hermetically sealed envelope, a terminal tag provided with a contact pin fixedly mounted in the envelope, and a support therefor comprising a substantially annular support member provided with an annular rib on the periphery thereof defined between opposed elbows therein. One of the elbows provides a groove seat registered with the periphery of an aperture provided in the oscillator envelope. The other elbow provides a groove seat for a bifurcated crystal mounting plate support having elastic characteristics. The mounting plate is resilient in the vibrating direction of the crystal and perpendicularly thereto. Mounted in the oscillator envelope in substantial alignment with weighted tine ends of the crystal is a pair of opposed dampers which enhance the impact-resistance characteristics of the oscillator. Also mounted in the oscillator envelope is a ground pin for preventing a short-circuit thereof.
An improved oscillator for a timepiece comprising a hermetically sealed oscillator envelope for housing oscillator components therein, a terminal tag mounted in said envelope being carried by a support therefor, contacts fixedly mounted in said terminal tag and extending exteriorly of said envelope housing, a tuning fork-type crystal vibrator mounted in said envelope, and a mounting means therefor carried on said terminal tag support, said means including bifurcations characterized by resilience in the vibrating direction of said crystal and perpendicularly thereto, said terminal tag support comprising a substantially annular support member, an annular rib on the periphery thereof, and a pair of opposed elbows therein, one of said elbows defining a groove having perpendicular abutment surfaces for abutting a continuous edge of an aperture provided in said oscillator envelope and said other elbow defining a groove having perpendicular abutment surfaces for thereby supporting said mounting means, said annular support member having a through hole in which said terminal tag is mounted.
A hermetically sealed quartz crystal tuning fork vibrator assembly particularly for use as a time standard in an oscillator circuit comprising in combination a flexural mode tuning fork quartz crystal vibrator having two substantially opposed planar surfaces and being adapted to vibrate in a first vibratory direction substantially parallel to said surfaces, and a mounting plate having a first portion including a substantially flat surface, the flat surface being secured to one of said opposed surfaces at a non-vibratory portion of said tuning fork vibrator, said mounting plate including a second portion mounted to a reference member, said mounting plate having a resilient portion intermediate said first and second portions, said resilient portion being formed of two substantially U-shaped spring-like elements, a first leg of each element being connected to said second portion and the other leg of each U-shaped spring-like element being adapted to vibrate in said first vibratory direction and to further vibrate in a second vibratory direction at an angle of about 90.degree. with respect to said first vibratory direction.
Dependencies are inferred from the claim text.