Kureha Kagaku Kogyo Kabushiki Kaisha

Alps Electric Co., Ltd.

Yasushi Endo

Hiroshi Obara

Seiichi Suzuki

Masato Nagura

Ryutaro Tamura

Kazushige Kikuchi

Motohisa Nara

In an infrared sensor having a pyroelectric element and a FET in a high frequency electric field and infrared radiation shielding case, a capacitor is located in the case and connected to at least one of the drain and source electrodes of the FET in order to remove an influence due to an external high-frequency electric field.

Infrared sensor

A capacitance type push-button switch which includes a movable member carried by the lower end of a key stem and including a holding member made of an elastic material of high compressibility and having a convex lower surface, a movable electrode made of an electrically conductive and flexible material held to the lower surface of the holding member, a dielectric film carried by the movable electrode and comprised of a synthetic resin of a fluoride type which can be brought into contact with two stationary electrodes to vary the capacitance therebetween, means including a pair of suspending pieces each carrying at their lower end portions a respective pawl adapted to engage the holding member when it is raised to its upper position for holding it in place, and means for releasing the pawls to bring the dielectric film into pressed contact with the stationary electrodes.

Variable capacitance type push-button switch

An ultrasonic image device such as may be used in a holography system or scanning system and having a piezoelectric transducer in which the conversion efficiency and phase are substantially constant over a wide frequency range. A piezoelectric sheet 5 .mu.m to 1000 .mu.m thick is used for a piezoelectric element. The piezoelectric sheet is constructed of a macromolecular material including polymers and copolymers of polar monomers. A high frequency signal input device applies to the electrodes coupled to the piezoelectric sheet high frequency signals of different frequencies in a range around a fundamental resonance of the piezoelectric sheet of .+-.10 to .+-.70% of the fundamental resonance frequency.

Ultrasonic holography imaging device having a macromolecular

The laminated electric element is composed of a plastic film having at least one of electric properties including dielectric, pyroelectric and piezoelectric properties, and carrying a conductive layer on at least one surface thereof, the plastic film being laminated with a foam layer. Between the plastic film having the conductive layer and the foam layer is provided a middle layer to permit a flat surface on the conductive layer-carrying plastic film. The provision of the middle layer can render the surface of the conductive layer-carrying plastic film or layer flat without causing deformation on the surface thereof by the curved or waved surface of the foam layer and permit an effective utilization of such electric properties in addition to an effective prevention of the electrode layer provided thereon from coming off. Where the electrode layer is provided inside the conductive layer-carrying plastic film, the corrosion of the electrode layer can be prevented effectively. The laminated electric elements having such structure as set forth hereinabove can be employed for a capacitive switch, an infrared sensor, an acoustic transducer or the like.

Growing community of inventors

Iwaki, Japan

Yasushi Endo