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:
Nov. 07, 1989
Filed:
Mar. 10, 1988
Yoshikazu Naito, Osaka, JP;
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
An image forming apparatus of a visible image transfer type provided with a standard pattern which is disposed at a position where it can be illuminated by a lamp for illuminating an original, a first sensor for detecting the density of the original and a second sensor for detecting the density of a visible image of a standard pattern. The light amount of the lamp is varied so as to make the density of the visible image detected by the second sensor fit a fixed value or fall within a fixed range, and is designated as a corrective data. The light amount of the lamp, which corresponds with the original density, is corrected in accordance with the corrective data by shifting a characteristic curve which shows the relation between the density of the original and the light amount of the lamp used for the original density measurement.