Matsushita Electric Industrial Co., Ltd.

Yoshiyuki Miyoshi

Michihiro Miyauchi

Shinya Tanaka

Koji Nakashima

Etsuo Tsujimoto

Tomio Marui

Tetsuya Tsumura

Kanji Machida

Koji Hiya

Hisatoshi Atsumo

The present invention offers a method of manufacturing a heat conductive substrate, with which substrate contamination on the surface of lead frame due to oozing or push out of thermosetting resin composite during heat-pressurization is suppressed. The oozing or push out of thermosetting resin composite from the through hole of lead frame can be prevented by a film attached on the components mounting surface of lead frame.

Method of manufacturing heat conductive substrate

In a power conversion module device of the present invention, a transformer, a primary power element and a secondary power element are mounted on a printed wiring board in surface-to-surface contact therewith, and no control circuit is mounted thereon. In addition to reducing impedance and loss in the wiring, this constitution improves the voltage waveform of the primary power element. Thus, noise reduction can be achieved. Further, because heat can be transferred to the printed wiring board, heat generated from the transformer, the primary power element and the secondary power element can be reduced. The size of the transformer can also be reduced.

Power conversion module device and power unit using the same

A process for producing roll-shaped magnets which may be used in electrophotographic copying machines or the like. At least two types of composite magnet sheets of different magnetic characteristics, each having a magnetic orientation in the thickness direction, are superposed to form a laminated body. A plurality of wedge-shaped indentations are formed in one side of the laminated body. The laminated body is then wound around a shaft so that its surface having the indentations constitutes the inner peripheral surface. A magnetization is then effected. This process conveniently permits the full magnetization of the laminated body to ensure a high quality and superior characteristic of the products, as well as a high productivity. during the mass production of such magnets.

Process of producing roll-shaped magnet

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Tsu, Japan

Yoshiyuki Miyoshi