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:
Mar. 27, 1990
Filed:
Aug. 24, 1988
Cornelis M Beyersbergen van Henegouwen, Eindhoven, NL;
Henricus M van Gestel, Eindhoven, NL;
Petrus J Blankers, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
The optical unit comprises a frame (1), a subrame (3), and objective holder (5) having an objective (7) for concentrating the radiation beam so as to form a radiation spot. First connecting means (11) movably connect the objective holder to the subrame, which first connecting means allow focussing movements of the objective and counteract other movements. Second connecting means (9) movably connect the subframe to the frame, which second connecting means allow radial tracking movements of the objective and counteract other movements. Electrically controllable first focussing means (19), connected to the frame and electrically controllable second focussing means (21) connected to the objective holder cooperate with each other to produce the focussing movements. Electrically controllable first tracking means (19) connected to the frame and electrically second tracking means (25) connected to the objective holder cooperate with each other to produce the tracking movements, and a reflecting surface (13) provided on the subframe directs the radiation beam towards the objective.