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:
May. 15, 1979
Filed:
Jul. 21, 1977
Fumio Ito, Yokohama, JP;
Mutsunobu Yazaki, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A photographic camera of the type having at least one reflection mirror positioned in a space between an objective lens optical system and a film plane so that an image bearing beam of light rays entering through the objective lens optical system after reflection from the mirror is deflected to the film plane, includes a dustproof shutter device for sealing the space containing the mirror from a film casette chamber when a film casette is loaded in the chamber therefor, in order to prevent dust and other falling particles from entering a photo-taking optical system chamber containing the mirror through an opening for the loading and removal of the film cassette.