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. 27, 2001
Filed:
Feb. 20, 2001
Other;
Abstract
There is provided a head of an optical data recording/reproducing device. The head is provided with a laser source, a deflector, a relay optical system and an objective lens system. The laser beam emitted by the laser source is incident on the objective lens system via the deflector and the relay optical system. The head is further provided with a rotation angle detecting system which includes a beam splitter provided between first and second relay lenses of the relay lens system, and a detector. The beam splitter divides the incident beam into a first beam directed to the second relay lens and a second beam directed to the detector. The detector has two light receiving areas, and a controller determines an amount of rotation of the deflector based on the amounts of light received by the two light receiving areas.