Daikin Industries, Ltd.

Osaka University

Shinya Bitou

Takashi Kanemura

Tetsuhiro Kodani

Saori Sakami

Tsuyoshi Sekitani

Takaya Yamada

Eri Mukai

Akinari Sugiyama

Takafumi Uemura

Shusuke Yoshimoto

Hiroyuki Sagami

An object is to provide a piezoelectric film with good piezoelectricity. This object can be achieved by a piezoelectric film comprising a vinylidene fluoride/tetrafluoroethylene copolymer film and having a residual polarization amount of 40 mC/mor more.

Piezoelectric film having a vinylidenefluoride/tetrafluoroethylene copolymer film

An object of the present invention is to provide a vibration sensor in which the frequency dependence of the output is small. The present invention provides a vibration sensorcomprising: a support; an organic piezoelectric materialdeformably disposed in or on the support; and an electrodefor extracting an electrical signal generated by deformation of the organic piezoelectric material, the electrodebeing formed on the organic piezoelectric material, the organic piezoelectric materialcomprising a copolymer of vinylidene fluoride and one or more monomers copolymerizable with vinylidene fluoride.

Vibration sensor and piezoelectric element

The present invention addresses the problem of providing a bimorph-type piezoelectric film that is less susceptible to the influence of pyroelectric noise resulting from temperature changes, and that makes it possible to provide a pressure-sensitive sensor or the like. The present invention provides a bimorph-type piezoelectric film comprising a first pyroelectric film having piezoelectric anisotropy in an in-plane direction, and a second pyroelectric film having piezoelectric anisotropy in an in-plane direction, the first pyroelectric film and the second pyroelectric film being disposed in such a manner that their surfaces on which electric charges of the same polarity are generated by a temperature increase are each outward-facing.

Bimorph-type piezoelectric film

Growing community of inventors

Osaka, Japan

Shinya Bitou