Olympus Optical Company, Ltd.

Nippon Mining Co., Ltd.

Tatsuo Imamura

Hiroyuki Yamamoto

Yutaka Yunoki

Hiroyuki Yoshimori

Hiroyuki Watanabe

Kenji Kimura

Akira Kato

Shinichi Harada

Yoshio Fukuda

Akira Katoh

Mitsuo Katoh

Hiroyuki Abe

Makoto Koike

A vertical recording magnetic head is disposed for movement close to or into sliding contact with a vertical recorded magnetic medium for purpose of magnetic recording and playback. To prevent the influences of external magnetic field upon a recording or reproduced magnetic field, a main magnetic pole of the head is surrounded by a block of a magnetizable material which exhibits a high permeability, which serves as a magnetic shield.

Vertical recording magnetic head

A transducer-to-medium stabilizer assembled with a transducer in a recording and/or reproducing apparatus is disposed in an opposing relationship with a flexible storage disk which is used as an information recording medium. The stabilizer comprises first and second block members which protrude from a base block member and a static pressure releasing arrangement on said stabilizer device. When the flexible storage disk is rotated at a high speed with respect to the stabilizer device, a negative pressure is formed between the stabilizer device and the disk, resulting in that the transducer is maintained in a constant and stable contact relationship with the disk.

Transducer-to-medium stabilizing device having a static pressure

Perpendicular magnetic head

A perpendicular magnetic head includes a main pole suitable for use exclusively in recording information signals which is made of a soft magnetic film having the high saturation magnetization and another main pole suitable for use exclusively in reproducing recorded signals which is made of a soft magnetic film having the high initial permeability, both being disposed at separate positions.

A helical scanning type video tape recorder includes a rotary cylinder which is slidable on a video tape; and a pair of vertical magnetization recording heads mounted on the peripheral wall of the rotary cylinder at prescribed positions. The plane of the vertical magnetization recording heads which faces the magnetic plane of the video tape is provided with a main magnetic pole and auxiliary magnetic pole, thereby causing at least one portion of the recording magnetic flux passing from the auxiliary magnetic pole to the main magnetic pole to penetrate the recording magnetic layer of the video tape at substantially right angles.

Video tape recorder including vertical recording heads

An anode for copper electrolysis is given improved dissolving activity and enhanced ability to curb the phenomenon of passivation by a cooling treatment which is carried out at a cooling speed of from 20.degree. C./hour to 400.degree. C./hour to at least 400.degree. C., preferably to 200.degree. C.

Method for treatment of copper anodes to be electrorefined

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Hachioji, Japan

Tatsuo Imamura