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:
Jun. 02, 1987
Filed:
Dec. 03, 1984
Minoru Yomoda, Kawasaki, JP;
Mitsugu Yamamura, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical device projects a pattern of a first object on a second object through an optical system. Changes in the temperature of the optical system or changes in the ambient temperature of the optical system are detected and, on the basis of the detected temperature, any focus deviation or displacement of the optical system due to the temperature change is corrected. The correction of the focus deviation is achieved by controlling the temperature of the optical system or the position of the second object.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile