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:
Mar. 30, 1993
Filed:
Aug. 03, 1990
Kazunari Taki, Nagoya, JP;
Hideo Maruyama, Kuwana, JP;
Riki Matsuda, Nagoya, JP;
Yumiko Ohashi, Hashima, JP;
Brother Kogyo Kabushiki Kaisha, Nagoya, JP;
Abstract
An optical data storage medium having a continuous tracking guide strip defining a single spiral recording track, or concentric tracking guide rings defining concentric recording tracks. The tracking guide strip or rings provide(s) tracking servo information which is optically read to position an optical head relative to the data storage medium, for centering a read/write beam on a desired recording track. The tracking guide strip or rings is/are formed of a material which has a higher light absorption coefficient than that of a material of the recording track(s). A method for fabricating the storage medium, and a tracking system for the storage medium are also disclosed.