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:
Sep. 04, 2007
Filed:
Aug. 31, 2005
Yoshihiro Ito, Asaka, JP;
Nobuaki Nago, Asaka, JP;
Takashi Kato, Minami-Ashigara, JP;
Hitoshi Miyano, Saitama, JP;
Yoshihiro Ito, Asaka, JP;
Nobuaki Nago, Asaka, JP;
Takashi Kato, Minami-Ashigara, JP;
Hitoshi Miyano, Saitama, JP;
Fujinon Corporation, Saitama, JP;
Fujifilm Corporation, Tokyo, JP;
Abstract
An optical unit capable of freely changing the refractive power and operating with a reduced deterioration in performance, an image taking apparatus having an image taking lens using the optical unit, and an optical finder using the optical unit. The optical unit includes a lens body having an electromagnetic field generator which changes the focal length of the lens body by moving, by an electromagnetic force, a dispersoid which is dispersed in a light-transmissive dispersion medium enclosed in a container, which is light-transmissive, and which has a refractive index different from the refractive index of the dispersion medium. The optical unit also includes a focal length changing section which changes the focal length of the lens body in three steps by controlling an electromagnetic field generated by the electromagnetic field generator.