The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 07, 2003
Filed:
Feb. 15, 2000
Toru Fujii, Tokyo, JP;
Emiko Hamada, Tokyo, JP;
Taiyo Yuden Co., Ltd., Tokyo, JP;
Abstract
An optical information medium is made up of a transparent substrate for a recording laser beam to penetrate therethrough, a recording layer formed on the transparent substrate, and a reflective layer for reflecting reproducing laser beam formed thereupon enabling the recording of optically readable signals by means of an incident recording laser from the transparent substrate. The transparent substrate has spiral-like tracking guides on the surface of the transparent substrate on which is formed the recording layer, and pre-pits indicative of address information are formed on a land portion defined between the tracking guides. The pre-pits are formed shifted from a center of the land. With this construction, the pre-pits open to a side of the tracking guide neighboring the land. With this, it is possible to read out address signals from the pre-pits with certainty when recording, and also to suppress errors due to mixing between the signals obtained from the pre-pits indicative of the address information and the recorded data read out from the pits on the tracking guides when reading the recorded optically readable signals.