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. 18, 2010
Filed:
Oct. 30, 2006
Yoshiharu Ooi, Chiyoda-ku, JP;
Yuzuru Tanabe, Chiyoda-ku, JP;
Hiromasa Sato, Koriyama, JP;
Takuji Nomura, Koriyama, JP;
Ryuichiro Shimizu, Koriyama, JP;
Yoshiharu Ooi, Chiyoda-ku, JP;
Yuzuru Tanabe, Chiyoda-ku, JP;
Hiromasa Sato, Koriyama, JP;
Takuji Nomura, Koriyama, JP;
Ryuichiro Shimizu, Koriyama, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
The present application relates to a liquid crystal lens element and an optical head device, in particular order, to a liquid crystal lens capable of switching the focal length among a plurality of different focal lengths according to switching of applied voltage among a plurality of applied voltages, and an optical head device employing the liquid crystal lens, for writing and/or reading an information to/from an optical recording medium.