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:
Nov. 14, 2000
Filed:
May. 07, 1998
Applicant:
Inventor:
Masaaki Sofue, Yokohama, JP;
Assignee:
Ricoh Co., Ltd., Yokohama, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 58 ; 369110 ; 369112 ;
Abstract
An optical disk apparatus is described which can read information from and write information to optical disk of different thicknesses. The optical disk apparatus includes coupling lenses which alter the focusing capabilities of an objective lens which controls reading and writing to the optical disk. Thus, the present invention allows both 'standard density' and 'high density' optical disks to be accessed by the same optical disk apparatus.