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:
Mar. 03, 1998
Filed:
Oct. 22, 1996
Masaya Kobayashi, Hachioji, JP;
Konica Corporation, Tokyo, JP;
Abstract
An optical system includes a laser light source; an objective lens for converging luminous flux emitted from the laser light source onto an information recording surface of an optical information recording medium through a transparent substrate of the optical information recording medium; and lateral magnification change device for changing a lateral magnification of the objective lens from a first lateral magnification m.sub.1 to a second lateral magnification m.sub.2 which is less than m.sub.1 according to a thickness of the transparent substrate. An amount of an offense against sine condition SC(m.sub.1 :NA.sub.2) represented by the following expression for NA.sub.2 at the first lateral magnification m.sub.1 of the objective lens satisfies the following conditional expression,
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile