Mitsui Toatsu Chemicals, Incorporated

Kunio Nishihara

Takayuki Ishikawa

Akihiro Yamaguchi

Masahiro Ohta

Shoji Tamai

Katsuyoshi Sasagawa

Masao Imai

Hiroshi Ozawa

Mutsuo Nakajima

Yoichi Hosono

Moritsugu Morita

Kazuo Miyazaki

Takashi Kayama

Atsushi Hagimura

Ikuo Inage

Kunihiro Nagamine

Youichi Hosono

Solid printed substrate and electronic circuit package using the same

A flexible circuit board including a flexible substrate having an insulating polyimide sheet and a wiring pattern portion formed in a mounting portion and a wiring pattern portion formed in a connecting portion, and a metal substrate on which only the mounting portion of the flexible substrate is secured by means of a thermoplastic polyimide film. Electronic devices are mounted on the mounting portion of the flexible substrate and heat generated by the electric devices can be effectively dissipated through the metal substrate. The connecting portion of the flexible substrate can be connected to an external circuit by means of a connector provided at an edge of the connecting portion. Since the connecting portion is not secured to the metal substrate, connector pins having a large mechanical strength can be used and the connecting portion can be bent at will.

Flexible printed circuit board having a metal substrate

A multi-layered electrostrictive effect element comprises films or thin plates of an electrostrictive material and inner electrodes alternatively arranged in layers, the inner electrodes being formed on the entire surface of the films or thin plates of the electrostrictive material, wherein the insulating layer which insulates the inner electrodes exposed on the side end faces of the element comprises a polyimide resin having repeating units represented by the following general formula (I): ##STR1## (wherein X represents a tetravalent group selected from the group consisting of tetravalent phenyl groups; tetravalent biphenyl groups; and tetravalent polyphenyl groups in which at least one of either the phenyl or bipheny groups are bonded through at least one member selected from the group consisting of O, CO, S, CH.sub.2, C(CH.sub.3).sub.2 and C(CF.sub.3).sub.2 and Y represents a bivalent groups selected from the group consisting of bivalent phenyl groups; bivalent biphenyl groups; bivalent polyphenyl groups in which at least one of either the phenyl or biphenyl groups are bonded through at least one member selected from the group consisting of O, CO, S, SO.sub.2, CH.sub.2, C(CH.sub.3).sub.2 and C(CF.sub.3).sub.2 ; alkylene groups; and xylylene groups) and an insulating filler. A process for making a multi-layered electrorestrictive effect element having a high dielectric strength is also disclosed.

Multi-layered electrostrictive effect element

Flexible laminate printed-circuit board and methods of making same

An optical recording method which comprises providing a recording layer containing a recording susbstance that has an absorption maximum in the visible and near infrared wavelength region of 600 to 1,200 nm and loses or diminishes its power to absorb visible or near infrared radiation in the aforesaid wavelength region upon exposure to ultraviolet radiation, X-rays, an electron beam or an ion beam, and irradiating desired locations of the recording layer with ultraviolet radiation, X-rays, an electron beam or ion beam to form a pattern based on the presence or absence, or variation in strength, of the power to absorb visible or near infrared radiation in the aforesaid wavelength region so as to record information in the recording layer; a method for reading optically recorded information which comprises illuminating a pattern formed as described above with laser light having a wavelength in the aforesaid visible and near infrared region and detecting the presence or absence, or variation in intensity, of absorption of the laser light to read the recorded information; and optical recording media for use in the above-described optical recording method.

Optical recording method and media therefor

Growing community of inventors

Kanagawa, Japan

Kunio Nishihara