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:
Jan. 29, 1991
Filed:
Apr. 27, 1988
Applicant:
Inventors:
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369116 ;
Abstract
Method and device of beam control for stabilizing the laser beam output is controlled by adjusting the driving current of laser beam source. To adjust the driving current output light from laser beam source is detected by a photo detector. This output light has the same specific polarization components the light used to record or read from a magnetic optical disc. The detected light is converted into an electric signal corresponding to the light intensity. This electric signal is compared with a specified reference level to determine the change in the output level of the laser source due to a change in the ambient temperature.