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:
May. 26, 1998
Filed:
Dec. 09, 1996
Konica Corporation, Tokyo, JP;
Abstract
An optical pickup apparatus includes: a laser light source; a light converging optical system for converging a light beam emitted from the laser light source onto a first information recording surface of a first optical information recording medium having a thickness t1 of a transparent substrate, or a second information recording surface of a second optical information recording medium having a thickness t2 of a transparent substrate. The light converging optical system has a best fit wavefront aberration of 0.07 .lambda. rms or less at a numerical aperture of NA1 when the thickness t1 of the transparent substrate is used, and has a best fit wavefront aberration of 0.07 .lambda. rms or less at a numerical aperture of NA2 when the thickness t2 of the transparent substrate is used, where NA1 represents a numerical aperture on a side of the first optical information recording medium in the light converging optical system when the light beam emitted from the laser light source is converged as a light spot to be read out, NA2 represents an effective numerical aperture on a side of the second optical information recording medium in the light converging optical system when the light beam emitted from the laser light source is converged as a light spot to be read out, and .lambda. represents a wavelength of the light beam emergent from the laser light source. The optical pickup apparatus further includes a light detector for detecting light reflected from the first or second information recording surface.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile