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:
Dec. 29, 1992
Filed:
Oct. 25, 1989
Syuichi Honda, Yokohama, JP;
Cooper & Dunham, Tokyo, JP;
Abstract
An optical pickup apparatus includes a device for recording and reproducing information by changing a laser beam emitted from a semiconductor laser to a parallel light and by irradiating the parallel light to an optical information recording medium sequentially through a deflecting prism and an objective lens, a device for performing focusing and tracking servo controls by guiding a reflected light from the optical information recording medium to a servo optical system sequentially through the objective lens and the deflecting prism again, and a device for setting the positions of the deflecting prism and the objective lens such that the length of an optical path from a deflecting point of the deflecting prism to a main point of the objective lens is ranged from the focal distance of the objective lens to a length twice the focal distance of the objective lens.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile