Hitachi Maxell, Limited

Hitachi, Ltd.

Tetsurou Ikegaki

Toshinori Sugiyama

Kazuo Shigematsu

Yoshito Tsunoda

Yasunori Kanazawa

Shinichi Abe

Yoshitane Tuburaya

Mitsuru Shimizu

Nobuyuki Fujimoto

A transparent substrate and a method of producing the same suitable especially for an optical system for an optical data recording medium using a linearly polarized light as a data reading light such as a magneto-optical recording medium drive unit and an optical data recording medium for reading data using a linearly polarized light.

Optical data recording system and method of production of recording

An information recording disc is provided with a magnetic attracting member in the form of metal piece or magnetic material which serves for attracting a disc member for recording, in particular, for optical recording and reproducing of information, to a spindle of a recording and reproducing apparatus. The magnetic attracting member is held in the space of a holder which is fixedly secured to the disc without the magnetic attracting member being fixedly secured to the disc. This arrangement enables a magnetic clamping of the disc member which provides for a decrease of retardation and is suitable for miniaturization of the apparatus.

Information recording disc

Growing community of inventors

Toride, Japan

Tetsurou Ikegaki