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:
Dec. 17, 2013
Filed:
Jan. 28, 2010
Katsuhiro Ishido, Abiko, JP;
Katsuhiro Ishido, Abiko, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A document reading apparatus includes a white LED including an LED and a fluorescent material and configured to illuminate a document reading position with light, a reading unit having a color line sensor and a monochrome line sensor and configured to read an image of a document illuminated with the light emitted from the white LED, and a filter arranged on an optical path between the monochrome line sensor and the document, and wherein the filter is configured to suppress transmission of light at a peak wavelength of the LED so that, regarding an intensity of light to be received on the monochrome line sensor, the intensity of the light at the peak wavelength of the LED is smaller than the intensity of the light at the peak wavelength of the fluorescent material when the light emitted from the LED is received.