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:
Nov. 07, 2000
Filed:
Oct. 29, 1997
Applicant:
Inventor:
Shigeru Ogino, Tokyo, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ; G03B / ;
U.S. Cl.
CPC ...
396 81 ; 396 82 ; 396 97 ;
Abstract
An optical apparatus includes first and second lenses, first and second detection devices, and a control device. The first lens varies magnification, and the second lens, positioned on a focal-plane side of the first lens, corrects variation of an image forming position. The first detection device detects at least one of temperature and humidity. The second detection device detects positions of the first and second lenses. The control device controls movement of the second lens during movement of the first lens by using outputs from both the first and second detection devices.