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:
Aug. 10, 2010
Filed:
Feb. 02, 2007
Kouichi Murata, Tokyo, JP;
Takuji Nomura, Koriyama, JP;
Mitsuo Oosawa, Koriyama, JP;
Yoshiharu Ooi, Tokyo, JP;
Yuzuru Tanabe, Tokyo, JP;
Kouichi Murata, Tokyo, JP;
Takuji Nomura, Koriyama, JP;
Mitsuo Oosawa, Koriyama, JP;
Yoshiharu Ooi, Tokyo, JP;
Yuzuru Tanabe, Tokyo, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
A liquid crystal lens element capable of finely adjusting focal length according to the magnitude of applied voltage, and an optical head device employing such a liquid crystal lens element, are provided. On one surface of a transparent substrate, a transparent electrodeand a concave-convex portionmade of a transparent material having a cross section shape approximated by a saw-tooth shape, are formed so as to constitute a plurality of annular portions, and on one surface of a transparent substrate, a transparent electrodeis formed. The transparent electrodesandconstitute annular divided electrode segments, and division positions of the annular electrode segments are made to be agree with division positions of annular portions of the saw-tooth-shaped concave-convex portionof the transparent substrate