Citizen Finetech Miyota Co., Ltd

Citizen Watch Company, Ltd.

Citizen Finedevice Co., Ltd.

Aki Sudou

Kazuo Takahashi

Takayuki Hayashi

A cylinder internal-pressure sensor is provided with a housing unitcomposed of an outer cylinder portionand an inner cylinder portionhaving elastic portionsandhaving elasticity in an axial direction Fs formed on an intermediate portion Xm in the axial direction Fs; a pressure-receiving ring block portionhermetically fixed between the outer cylinder portionand the inner cylinder portionlocated on the fronts of the elastic portionsandand faced with the rear of the elastic portionsandthrough the elastic portionsandand having a front surfaceas a pressure receiving surface; at least one or more pressure detection elements, . . . in contact with one electrode portionprovided on a rear surfaceof this pressure-receiving ring block portion, given the internal pressure Pc by the pressure-receiving ring block portionand arranged at predetermined positions in a peripheral direction Ff; and a support ring block portionfixed between the outer cylinder portionand the inner cylinder portion, having a front surfaceas a support surface supporting the pressure detection elements. . . and serving also as the other electrode

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Nagano, Japan

Aki Sudou