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. 27, 2004
Filed:
Nov. 09, 2001
Kiyono Ikenaka, Hachioji, JP;
Koji Honda, Hachioji, JP;
Konica Corporation, Tokyo, JP;
Abstract
In an objective lens for use in an optical pickup device, when NA and N (NA NA ) represent a needed numerical aperture of the objective lens on an image side, a first spot and a second spot represent a spot formed by the light flux having passed through the central region, a m order diffracted ray and a n diffracted ray represent a diffracted ray having the maximum diffraction efficiency among diffracted rays, the central region nearly corresponds to a region through which the light flux in the inside of the numerical aperture NA passes, the light amount of the n order diffracted ray which reaches the inside of the second spot is less than that of the m order diffracted ray which reaches the inside of the first spot, and the m order diffracted ray and the n order diffracted ray satisfy the relationship of m=n.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile