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. 28, 1985
Filed:
Jun. 24, 1983
Kazuo Kashiwagi, Tokyo, JP;
Takao Toda, Shinagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention provides an apparatus for projecting the image of an original on the projection surface of a screen or photosensitive member, the apparatus having an illumination correction device for changing a distribution of illuminance on the projected surface, the illumination correction device being adapted to process a difference between the amount of a light passing near the center of the projection optical path and the amount of a light passing near the marginal portion of the same optical path to obtain the results on which the illumination correcting device will be controlled to correct any irregularity of the illuminance distribution on the projected surface.