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:
Apr. 07, 1998
Filed:
Feb. 26, 1996
Shoji Kikuchi, Yokohama, JP;
Mineo Nozaki, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image reading apparatus includes a plurality of light sources for illuminating an original, a photoelectric conversion device for converting light from the original illuminated by each of the plurality of illuminating means, and a discriminating circuit for discriminating whether or not any image exists on the original, based on image signals output from the photoelectric conversion device at least when the original is illuminated with light from one of the light sources, which possesses spectral characteristics including green. A control circuit controls the apparatus so that, when the discriminating circuit has determined that no image exists on the original, the manner of reading of the image with the light sources other than the light source employed in the discrimination performed by the discriminating circuit is changed from the manner of reading of the image with the light source employed in the discrimination.