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:
Oct. 31, 2000
Filed:
Aug. 06, 1999
Bernardus H Hendriks, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
An optical device for optically scanning an information plane includes a radiation source for supplying a scanning beam, and an objective system for focusing the scanning beam to a scanning spot on the information plane. The temperature dependence of the objective system can be compensated by a compensator which includes a planoconvex first element and a planoconcave second element arranged between the radiation source and the first element, the convex surface of the first element confronting the concave surface of the second element, and the refractive indices of the first and the second element being equal at the design temperature but having a different temperature dependence.