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. 21, 2000
Filed:
Aug. 20, 1998
Applicant:
Inventor:
Bernardus H Hendriks, Eindhoven, NL;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G11B / ;
U.S. Cl.
CPC ...
359821 ; 359822 ; 369 58 ;
Abstract
A scanning device for an optical record carrier (1) comprises a high-numerical aperture dual lens objective system (10, 11) for focussing a radiation beam (7) on an information layer (3) of the record carrier. The lens (11) of the objective system closest to the record carrier is tilted by a tilt servo system in response to tilt of the record carrier. The tilt angle of the lens is preferably less than the tilt angle of the record carrier in order to reduce optical aberrations of the radiation beam such as coma and astigmatism.