Matsushita Electric Industrial Co., Ltd.

Noboru Itoh

Isao Satoh

Shunsaku Muraoka

Kenji Hasegawa

Sadao Mizuno

Koichi Osano

Akinaga Natsui

Syouzou Ninomiya

Sadao Mizumo

In a magnetic head, a multilayer film is disposed, the multilayer film including metal magnetic films and non-magnetic films that are alternately laminated, and a boundary between the multilayer film and a magnetic oxide substrate or a non-magnetic substrate on which the multilayer film is to be formed is parallel with a gap section at a surface of the magnetic head for sliding with respect to a magnetic recording medium. The metal magnetic films constituting the multilayer film have two or more types of thickness, or the metal magnetic films constituting the multilayer film have a uniform thickness, and the uniform thickness t satisfies t&#x3c;v&#xd7;cos&#x3b8;/fmax, where v denotes a relative speed of the head to the recording medium, fmax denotes an upper limit of frequencies to be used and &#x3b8; denotes an azimuth angle. With this configuration, a magnetic head having a suppressed pseudo signal and reduced noise can be provided, and a magnetic recording/reproducing device incorporating this magnetic head can be provided.

Magnetic head with multilayer film including metal magnetic films and non-magnetic films and magnetic recording/reproducing device

In an optical disc recording-reproducing apparatus using a standard optical disc enclosed in a cartridge, and optical plate for correcting various aberrations generated by a focusing lens is comprised therein in order to allow use of a double recording optical disc enclosed in the standard cartridge of the same size, the optical plate is placed in front of a focusing lens when the double recording optical disc is used, and is removed from the front of the focusing lens when the standard optical disc is used.

Optical head

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Hirakata, Japan

Noboru Itoh