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. 28, 1998
Filed:
Apr. 06, 1995
Applicant:
Inventors:
Hiroto Ohkawara, Ibaraki-ken, JP;
Masahide Hirasawa, Kanagawa-ken, JP;
Taeko Tanaka, Kanagawa-ken, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A04N / ;
U.S. Cl.
CPC ...
348358 ; 348335 ;
Abstract
A lens control device includes a variator lens for zooming, a focusing lens for compensating for a focus plane position change associated with the variator lens' movement, a conversion lens for modifying the focal length determined by the variator lens, a driver for driving the variator lens and the focusing lens, and a control circuit for changing a driving speed of the variator lens between when the conversion lens is mounted and when the conversion lens is not mounted.