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. 09, 2000
Filed:
Nov. 17, 1998
Tadayuki Kajiwara, Chikushino, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An image forming apparatus performs the gamma correction based on an image density on a photosensitive body or an intermediate transfer body. In the image forming apparatus, a test pattern generator unit generates a test image on the photosensitive body or the intermediate transfer body. A first density detector unit is provided in an upstream of a toner transfer section with respect to a rotation direction of the photosensitive body or the intermediate transfer body, and detects an image density on the photosensitive body or the intermediate transfer body. A second density detector unit is provided in a downstream of the toner transfer section with respect to the rotation direction of the photosensitive body or the intermediate transfer body, and detects the image density on the photosensitive body or the intermediate transfer body. A corrector unit corrects image data. A control unit calculates correction data for use in correcting the image data based on image density data outputted from the first and second density detector units to set the correction data in the corrector unit.