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:
Jul. 01, 2008
Filed:
Feb. 27, 2007
Hiromu Inoue, Yokohama, JP;
Tomohide Watanabe, Yokohama, JP;
Satoshi Endo, Fuji, JP;
Masami Ikeda, Numazu, JP;
Hiromu Inoue, Yokohama, JP;
Tomohide Watanabe, Yokohama, JP;
Satoshi Endo, Fuji, JP;
Masami Ikeda, Numazu, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
NuFlare Technology, Inc., Numazu-shi, JP;
Abstract
A focusing device comprises a first imaging optical system, a second imaging optical system which splits the optical image in the direction of an AF sensor and further splits the optical image so that a front focus image in which the point that is in focus is in front of the optical image on the inspecting sensor and a back focus image in which the point that is in focus is behind the optical image on the inspecting sensor are formed on the AF sensor, a focus detecting circuit which detects an optimum focus position on the basis of a high-frequency component of a front sensor image in a front focus position and a high-frequency component of a back sensor image in a back focus position, and a focus control circuit which controls the focusing of the first imaging optical system on the basis of the focus position.