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:
Oct. 03, 1995
Filed:
Feb. 28, 1994
Yuji Ishikawa, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image reading apparatus for photoelectrically reading an image (e.g. as used in facsimile apparatus, digital copying machines, etc.) includes a reference member provided at a reading position within the image reading apparatus; a reading device for reading, at the reading position, an image of at least one of (i) an original document and (ii) the reference member, and for generating image data representative of the read image; a memory unit for previously storing as reference data, data obtained by reading the reference member with the reading device; a correcting device for correcting image data obtained by reading an original document with the reading device; using the reference data stored in the memory unit; a discriminating device for discriminating whether the original document is present at the reading position by comparing position data, obtained by reading the image at the reading position, with the reference data stored in the memory unit; and a control unit for controlling the memory unit to store the position data to replace the reference data, when the discriminating device discriminates that the original document is not present at the reading position.