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:
Jun. 12, 2001
Filed:
Jul. 21, 1999
Hiroshi Shiba, Numazu, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In a density control apparatus capable of coping with a change in light sensitivity, an image formation device forms a toner image on a photosensitive body on the basis of an image signal, a sensor measures density of the toner image formed on the photosensitive body, a correction device causes the sensor to measure density of a portion where the toner image is not formed on the photosensitive body and corrects sensitivity of the sensor on the basis of the measured result, a setting device sets a level shifting quantity of an output signal from the sensor after the sensitivity of the sensor is corrected by the correction device, and a determination device causes to form plural images of different densities and determines an image formation condition on the basis of the result of measuring the density of the images and the shifting quantity set by the setting device.