Tdk Corporation

Tdk Electronics Company, Limited

Motoyoshi Fujita

Noboru Uemura

Masao Shigeta

Tsutomu Kotani

Kazuo Fukunaga

Norio Sato

Toshiharu Kawano

Shunpei Saeki

Akikazu Kunuki

Eiichi Suga

Minoru Higurashi

A magnetic head of a cassette tape recorder set is demagnetized by a demagnetizer mounted in a tape cassette housing. The demagnetizer has an erase head which faces with the magnetic head which is subject to a demagnetizing action, a pair of rotatable rings which engage with spindles of the tape recorder set, energizing means for energizing said erase head with AC decreasing current, and coupling means for coupling said rings for simultaneous rotation of the rings.

Demagnetizer for a magnetic head of a cassette tape recorder

The improved structure of an inductor with an amorphous sheet core and a winding has been found. A core assembly has a pair of housing halves made of non-magnetic material with U-shaped track, in which a laminated amorphous sheet is mounted. The ends of the halves are inserted in a winding so that the ends of the cores abut with each other directly or through a gap spacer. The core halves are pressed by spring action to assemble the inductor. The core halves are produced by the steps of winding an amorphous sheet to a coil, inserting the coil in the track of the housing, and impregnating the coil with plastics.

Inductor

An electromagnet for degaussing a magnetic head and which includes a yoke having a gap and one or more coils wound thereon is characterized by the middle portion of the yoke face, at and adjacent to said gap, being wider than the magnetic tape that passes by the magnetic head, and by the side portions of said yoke face, away from said gap, being narrower than the tape.

Electromagnet for degaussing record-reproduce heads

Growing community of inventors

Chiba, Japan

Motoyoshi Fujita