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:
Feb. 07, 2012
Filed:
Nov. 22, 2005
Masayuki Iwasaki, Saitama, JP;
Naoki Fujii, Saitama, JP;
Seiichi Ohsawa, Saitama, JP;
Citizen Holdings Co., Ltd., Tokyo, JP;
Abstract
In an optical disk drive mounting a drive unithaving a control use circuit, and a pickuphaving an aberration correction liquid crystal elementand a drive use circuitwhich drives the aberration correction liquid crystal element, wherein the drive use circuitstores astigmatic data for correcting a static astigmatism peculiarly provided in an optical system in the pickupin an astigmatic data storage, and drives the aberration correction liquid crystal elementbased on the astigmatic data. By storing the static astigmatic data peculiar to the pickup, inside the pickup, it is possible to transfer the stored astigmatic data to the optical disk drive side easily, and to correct the astigmatism by driving the aberration correction liquid crystal element based on the astigmatic data.