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. 16, 1999
Filed:
Jun. 30, 1997
Hiroyuki Yamazaki, Hachioji, JP;
Katsuya Yagi, Hachioji, JP;
Konica Corporation, Tokyo, JP;
Abstract
An apparatus for recording or reproducing information on an information recording surface of an optical information recording medium having a transparent substrate, includes a laser source to emit a light beam having a wavelength of .lambda. nm; and an objective lens to converge the light beam emitted from the laser source on the information recording surface of the optical information recording medium through the transparent substrate. When the light beam is converged through the transparent substrate of the optical information recording medium, a wavefront aberration of the objective lens has a curve which has a step at a numerical aperture (NA), and the following conditions are satisfied,
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile