Tosoh Corporation

Tatsuo Kawasaki

Toru Futami

Koyata Takahashi

Kenichi Sekimoto

Tsuyoshi Tanaka

Keiichiro Nishizawa

Koji Katayama

Mutsumi Asano

Toshio Inase

Shigeru Hiramatsu

Yuji Kawara

A near field optical recording medium having a header area in which at least an addressing signal or a timing signal is recorded by means of a concave/convex pattern with laser light using a flying optical head. When a concave/convex portion of the concave/convex pattern is to be detected, either an effect due to a change in returning light caused by distance wherein the reflectance is changed or an effect due to a change in returning light caused by a diffraction effect is sufficiently larger, or a combination of such effects (changes by distance effect and changes by diffraction effect) are not weakened by each other, so that header information recorded by the concave/convex pattern can correctly be reproduced even in a super-high density recording medium using near field light.

Near field optical recording medium

An optical recording medium able to reproduce address information during seeking in which an optical head moves between tracks, to increase seek speed, to improve recording/reproduction speed and to obtain a good header reproducing signal is achieved by that the concave portions or convex portions constituting a reproducing signal in seeking reproduced even during seek and/or constituting a timing signal for writing a header signal are connected to each other in a direction orthogonal to the tracks, when these concave portions and/or convex portions are placed in positions equivalent to each other in the adjacent tracks.

Optical recording medium having address pits in the header region connecting with each other

Growing community of inventors

Kanagawa-ken, Japan

Tatsuo Kawasaki