Matsushita Electric Industrial Co., Ltd.

Akira Kagata

Tetsuo Yoshikane

Hiromi Hiura

Ryoichi Imanaka

Shuichi Obata

Masashi Itoh

Katsuhiko Morita

Masatoyo Kubo

Disc-shaped recording medium capable of recording data signals by means

An information generating stylus to regenerate an information signal on a stylus base on which an electrode is applied as a variance of electrostatic capacity in conjunction with a running disc recording medium in which the information signal is recorded as a variance in a geometrical shape and a manufacturing method thereof, which comprises forming a prism with a part of the side on which said electrode is provided working as one side therefor on a tip of the conical or pyramidal stylus base with the electrode formed on one side, forming a sliding face with the disc recording medium on a tip of the prism.

Information signal regenerating stylus and manufacturing method thereof

Magnets are attached to both ends of a knife-edge member pivotably received by a knife-edge bearing member while magnets are disposed in opposed relation with the first-mentioned magnets so that the displacement in the longitudinal direction of the knife-edge member may be prevented by the magnetic repulsive forces interacting between the first and second mentioned magnets.

Knife-edge bearing system

A pickup arm lifting device in which a follower magnet is attached to the lower end of a slide shaft disposed for vertical movement for lifting or lowering a pickup arm, and a lifting magnet and a lowering magnet are mounted on an operating plate and are so magnetically oriented that the lifting magnet repels the follower magnet while the lowering magnet attracts the follower magnet, whereby when the operating plate is so displaced as to bring the lifting or lowering magnet in line with the follower magnet, the follower magnet is repelled away from or attracted toward said lifting or lowering magnet and consequently the slide shaft is lifted or lowered to lift or lower the pickup arm.

Pickup arm lifting device

In a stereophonic pickup cartridge which derives two or more than two electric signals from a stereophonic sound recording disk of so-called 45.degree. -- 45.degree. type, there is provided a displacement-type pickup cartridge having an improved vibration transmission structure.

Growing community of inventors

Neyagawa, Japan

Akira Kagata