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:
Oct. 10, 2006
Filed:
Jun. 23, 2005
Yuhei Kobayashi, Kanagawa, JP;
Yuhei Kobayashi, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
The astigmatic aberration in an optical system is to be adjusted. Specifically, in an optical disc device on which can be selectively loaded a first optical disc having a first index of double refraction or a second optical disc having a second index of double refraction larger than said first index of double refraction, and which includes a liquid crystal devicebetween a light sourceand an objective lensconverging a light beam radiated from said light source on the optical discloaded on the optical disc device, the voltage applied to the liquid crystal deviceis adjusted to correct the coma aberration or the astigmatic aberration for the first disc or the second disc, respectively.