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. 01, 2012
Filed:
Aug. 23, 2006
Takeshi Kinoshita, Chiba, JP;
Koji Yoneda, Chiba, JP;
Toshihiro Hirai, Nagano, JP;
Takahumi Ogiwara, Nagano, JP;
Katsuya Fujii, Nagano, JP;
Takeshi Kinoshita, Chiba, JP;
Koji Yoneda, Chiba, JP;
Toshihiro Hirai, Nagano, JP;
Takahumi Ogiwara, Nagano, JP;
Katsuya Fujii, Nagano, JP;
SEIKO Precision Inc., Chiba, JP;
Shinshu University, Nagano, JP;
Abstract
A variable focal length lens, as well as a focal length adjusting device and an imaging device using the same. A variable focal length lens has a lens, a positive electrode, and a negative electrode. A second layer and a first layer constituting the lens are formed from polyvinyl chloride with which a plasticizer has been mixed. The hardness of these layers is adjusted by adjusting the mixing quantity, plasticizer type, etc. The second layer is formed so as so cover at least a light transmission region of the first layer. When a voltage is applied between the positive electrode and the negative electrode, the second layer and first layer are deformed to be pulled to the positive electrode, and thereby the curvature of the variable focal length lens is varied to vary the focal length.