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:
Jan. 24, 1995
Filed:
Jun. 03, 1992
Shinji Takagi, Kawasaki, JP;
Hideki Tanaka, Yokohama, JP;
Tatsuo Kimura, Kawasaki, JP;
Jun Ashiwa, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
After an ink-jet recording head with a plurality of discharging portions arranged is main-scanned in a direction perpendicular to the direction of the discharging portion arrangement to record a first image area, sub-scanning of the head is performed. Before the head is main-scanned to record a second image area, the sub-scanning is performed so that a few discharging portions on an upper edge portion of the head in second main-scanning overlap part of the first image area. Ink droplets land on pixels in the overlapping portion twice for each main-scanning, and image density of the pixels in the overlapping portion is controlled by the sum number of the landing ink droplets. This enables image density unevenness of image density, example, a 'black stripe (banding)' or a 'white stripe (banding)' in a boundary of an image area being recorded in each main-scanning, to be markedly reduced.