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:
Mar. 22, 2011
Filed:
Nov. 15, 2005
Kazuo Suzuki, Fujimino, JP;
Yuichi Kato, Higashiyamato, JP;
Takahiro Kawada, Sayama, JP;
Yasuhiro Kageyama, Tokorozawa, JP;
Tomohiro Ando, Higashimurayama, JP;
Kazuo Suzuki, Fujimino, JP;
Yuichi Kato, Higashiyamato, JP;
Takahiro Kawada, Sayama, JP;
Yasuhiro Kageyama, Tokorozawa, JP;
Tomohiro Ando, Higashimurayama, JP;
Citizen Holdings Co., Ltd., Tokyo, JP;
Abstract
Predetermined voltage is applied to a liquid crystal lens by a liquid crystal lens driver. Image signals are generated based on an optical image passed through the liquid crystal lens during transient response operation caused by application of the predetermined voltage, and plural focus signals are extracted by sampling the image signals at predetermined cycles. Levels of the extracted autofocus signals are compared to determine the maximum value of the autofocus signal. Thus, with the liquid crystal lens, by making use of the transient response operation of the liquid crystal lens, a focus point can be detected in sufficient speed.