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:
Jan. 21, 1994
William S Oakley, San Jose, CA (US);
Lots Technology, Inc., Santa Clara, CA (US);
Abstract
In an optical storage system, an apparatus for focussing a light beam onto a recording medium. A light source generates a light beam which is modulated by a thin-film PLZT modulator array. A beamsplitter is used to direct the modulated light beam to an objective lens which focuses the modulated light beam onto the recording medium. The light reflected back from the recording medium is directed by the beamsplitter to a focus detector which generates an electrical signal corresponding to a degree of focus of the modulated light beam in reference to the recording medium. A focus actuator is placed in close proximity to the modulator, wherein the focus actuator has a mirrored surface for reflecting the light beam to the beamsplitter. By moving the focus actuator in an optical axis according to the electrical signal generated by the focus detector, a high bandwidth servo loop can be closed about the focal position.