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:
Aug. 25, 2015
Filed:
Mar. 18, 2013
Shigetaka Kato, Shinshiro, JP;
Katsufumi Suzuki, Okazaki, JP;
Natsuyo Higashi, Toyokawa, JP;
Hirotada Seki, Toyokawa, JP;
Shigetaka Kato, Shinshiro, JP;
Katsufumi Suzuki, Okazaki, JP;
Natsuyo Higashi, Toyokawa, JP;
Hirotada Seki, Toyokawa, JP;
Konica Minolta Business Technologies, Inc., Chiyoda-ku, Tokyo, JP;
Abstract
An image forming apparatus calculates a positional deviation in the main and sub-scanning directions for each color by forming registration patterns in two arrays along a sub-scanning direction on an image carrier. Each registration pattern in one array is paired with an identical registration pattern in the other array. A first sensor has: a light-emitting element irradiating one registration pattern in a pair; a photodetector for regular reflection light; and a photodetector for diffuse reflection light. A second sensor has: a light-emitting element irradiating the other one in the pair; and a photodetector for regular reflection light. The relative positions of a pair of registration patters calculated using the respective sensors are corrected so as to reduce the positional deviation between the calculated positions by the amount of offset deviation estimated occur between positions detected by the respective sensors when the registration patterns are without positional deviation.