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:
Jul. 05, 1994
Filed:
Sep. 28, 1992
Katsuhiko Tanaka, Kanagawa, JP;
Hideki Okatani, Kanagawa, JP;
Michihiro Kuramochi, Kanagawa, JP;
Tetsuji Aoyagi, Kanagawa, JP;
NSK Ltd., Tokyo, JP;
Abstract
In order to provide an optical disk drive and read/write apparatus, the time of erasure, recording and reproduction of data by which is shortened to heighten the apparatus in access speed and data transfer speed, in the apparatus according to the present invention, an optical disk 4 is clamped to a turntable 2 supported with bearings 24 by a housing, and an optical head 5 is movably supported by the housing so as to face the disk. Four such optical heads 5 are disposed at equiangular intervals on a circle, and controlled independently of each other to perform the erasure, recording and reproduction of data from and in the disk 4 so as to make the apparatus much higher in access speed and data transfer speed than in the case that only one optical head is used.