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:
Apr. 21, 1998
Filed:
Aug. 28, 1996
Tomoyoshi Ikeya, Yamanashi, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Pioneer Video Corporation, Yamanashi, JP;
Abstract
A master optical disk recording apparatus forms a train of pits on a recording layer of a master optical disk by a laser beam which is emitted from the laser light source and is modulated by an acousto-optic modulator. An objective lens in the recording apparatus consists of a finite conjugate type lens and a convergence point on the acousto-optic modulation element where the laser beam is converged by a convergence lens is positioned outside of the focal point of the objective lens at the incidence side thereof.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile