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:
May. 08, 1990
Filed:
May. 18, 1987
Akihiko Hashimoto, Hachioji, JP;
Toshihiro Kitahara, Akishima, JP;
Hiroshi Hashi, Higashimurayama, JP;
Takao Rokutan, Koganei, JP;
Olympus Optical Co., Ltd., , JP;
Abstract
An optical card for storing a data signal as optically readable pits including a plurality of track units, each track unit being composed of a single control track having an array of square control blocks extending in first direction, and a plurality of data tracks disposed on respective sides of the control track. The control and data tracks are aligned in a second direction perpendicular to the first direction. Data signals forming a single byte are recorded over a plurality of data tracks at positions which are aligned in the second direction. The control blocks in the control track are arranged such that focusing error, tracking error and clock pulses can be detected by processing signals obtained by optically scanning the control blocks.