Citizen Watch Company, Ltd.

Toshihiko Nakayama

Hisao Wakabayashi

Hiroshi Hishida

Isao Koyama

Katsuo Nishimura

Hisao Yoshikawa

Kenji Takei

Takatoshi Nakayama

A liquid crystal display cell for use in an electronic timepiece having an analog display of time by time indicating hands combined with a digital display, said liquid crystal display cell being of polygonal profile in plan, with one internal angle of said profile being in the range 180 degrees to 360 degrees.

Liquid crystal display cell for an electronic timepiece

A supporting structure for a thickness-shear type crystal oscillator for watches which has an excellent resistance to shocks, which is very compact in construction and which can support not only an annular crystal piece but also support a rectangular crystal piece is disclosed. The supporting structure comprises a supporting frame which is provided at its opposed inner periphery with tongues adapted to be engaged with corresponding notches provided on opposed end portions of a crystal piece, respectively.

Supporting structure for a thickness-shear type crystal oscillator for

An oscillator case assembly includes a casing element and an oscillator element housed therein in a hermetically sealed manner. The casing element is made of a solid insulating material, preferably glass or ceramic material, and at least two thin conductive layer elements are provided on said casing element, each serving as parts of lead-in and lead-out means for the oscillator element, respectively.

Case assembly for piezoelectric resonator

An improved AT-cut crystal oscillator for electronic watches. The AT-cut crystal oscillator is of substantially disc-shape. Furthermore, the AT-cut crystal oscillator is shaped in cross-section such that the periphery of the disc-shaped crystal oscillator is abruptly tapered. In the preferred embodiment, the cross-section is trapezoidal.

Shape, AT-cut crystal oscillator

The invention relates to a support structure for a thickness-shear mode, convex lens type oscillator. The support structure contains an elastic ring made from an insulating material such as nylon. This ring is formed with a plurality of spaced, radially inwardly and integrally extending projections from the ring proper and said projections represent concentric recesses of opposite configurations one after another adapted for establishing pressure contact with the quartz crystal at their opposite surfaces and at different peripheral areas thereof.

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Tokorozawa, Japan

Toshihiko Nakayama