Citizen Watch Company, Ltd.

Hiroshi Hishida

Hisao Wakabayashi

Toshihiko Nakayama

Isao Koyama

Hisao Yoshikawa

A sphygmomanometer including a constant rate air-bleed valve for that is coupled to a cuff for reducing the pressure in the cuff. The valve has a valve casing and a tubular member in the casing. A slit in the tubular member allows air to bleed from the cuff at the constant rate and a regulator is provided for adjusting the bleed rate.

Electronic sphygmomanometer

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 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.

Growing community of inventors

Saitama, Japan

Hiroshi Hishida