Kureha Kagaku Kogyo Kabushiki Kaisha

Hiroshi Obara

Naohiro Murayama

Masafumi Yoshida

Tetuaki Kon

Teruo Sakagami

Yoshikichi Teramoto

Kenichi Nakamura

Masahiro Segawa

Yasushi Endo

Masato Nagura

Ken'ichi Nakamura

Kazushige Kikuchi

Disclosed is a polarized, shaped material comprising a copolymer of 40 to 87 mol % of vinylidene fluoride, 10 to 40 mol % of trifluoroethylene and 3 to 20 mol % of vinyl fluoride.

Polarized, shaped material of copolymer of vinylidene fluoride

The photoelectric detector contains a photosensor or light-sensing element of a pyroelectric polymer film interposed by two disturbance-preventive chambers such that the two disturbance-preventive chambers are designed so as to equalize the pressures therein to ambient pressure. The photoelectric detector undergoes no or little disturbance from the ambient atmosphere, thereby permitting an accurate detection or measurement of light or beams detected by the photosensor or light-sensing element mounted in the detector.

Photoelectric detector

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 ultrasonic probe of this invention contains a uniaxially elongated polymer piezoelectric element in which the piezoelectric element provided at the both sides with a thin layer electrode is disposed such that at least one of the electrodes is divided into long and small electrode portions to form a unit element and the unit elements are arranged in a direction at an angle in the scope ranging from 45.degree. to 135.degree. with respect to the direction in which the piezoelectric material is uniaxially elongated. The ultrasonic probe having the aforesaid structure is constructed such that each of the unit elements undergoes no adverse influence from the adjacent unit elements so that it permits a high resolving power without any noise acoustic waves generated.

Ultrasonic probe

An infrared detector comprising a polymeric pyroelectric device and a field effect transistor as an impedance conversion circuit.

Infrared detector

This invention concerns a pyroelectric infrared detector, comprising a substrate and polymeric pyroelectric elements mounted to both surfaces of the substrate, in which the electrode plates on one of the polymeric pyroelectric element are connected electrically to the electrode plates of opposite polarities on the other of the polymeric pyroelectric elements respectively.

Pyroelectric infrared detector

A matrix switch comprises a lamination of several layers in which first and second piezoelectric films have row and column electrodes, respectively, arranged in parallel on their first surfaces. A ground electrode is between said row and column electrodes. The operating electrodes are at cross points which are deformable to result in two piezoelectric output signals from each cross point; one between ground and an operating row electrode, and the other between ground and an operating column electrode.

Laminated piezoelectric matrix switch

A high molecular weight piezo-electric element is spanned across and adhered to a frame by first affixing the element to a base film which provides support and increases rigidity. Subsequent to adherence, the base film is removed.

Method of spanning across a frame a high-molecular-weight piezoelectric

A method of measuring the mechanical vibration of an object comprising contacting one of the surfaces of a piezoelectric element comprising a polarization treated polyvinylidene fluoride piezoelectric film having metal thin films as electrodes deposited on both surfaces thereof with an object to be measured while covering the opposite surface of the piezoelectric element contacting with the object to be measured with a flexible sound absorbing material for avoiding interference with sound waves in the surroundings and measuring or detecting the vibration of the object by the changes in the electric field caused by the vibration of the object and produced on the surface of the piezoelectric element.

Vibration measuring and the apparatus therefor

A key board switch comprising a multi-piezoelectric polymer film element A having, in the surface of the polymer film, a plurality of piezoelectric unit elements satisfying the following criteria: (a) the unit elements have electrodes on both surfaces thereof, (b) the portions of the polymer film of the piezoelectric unit elements held between the electrodes on both surfaces have piezoelectric properties and (c) any two piezoelectric unit elements are electrically independent of each other at least with respect to electrodes on one of the surfaces; and a substrate sheet B on which the polymer film element A is laid over and having windows or recesses in the positions corresponding to each of the piezoelectric unit elements of the polymer film element A. The key board switch is adapted so that those portions of the polymer film between each of the piezoelectric unit elements in the element A are secured to the substrate B at intermediate positions between the windows or recesses in the substrate B, whereby the stress applied to one of the piezoelectric unit elements is not transmitted to other adjacent elements so that the changes in the electric field generated from each of the piezoelectric unit elements can be an independent output.

Growing community of inventors

Iwaki, Japan

Hiroshi Obara