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:
Dec. 05, 2000
Filed:
Feb. 08, 1999
Koichi Otsuki, Nagano-ken, JP;
Hiroaki Momose, Nagano-ken, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
The technique of extending a printable area, in which an image can be recorded, by carrying out a sub-scan with rollers in a delivering section of a printer having a lower accuracy of sheet feeding often causes dropout of raster lines and thereby deteriorates the picture quality of a resulting printed image. In an ink jet printer of the present invention, the interlace method is applied to record an image in a first area where rollers in a feeding section ensure the accuracy of sheet feeding, in order to attain the high picture quality. The printable area Is extended to a second area, where the rollers in the delivering section are used to carry out the sheet feeding of the lower accuracy after the lower end of a printing medium comes off the rollers in the feeding section. In the present invention, recording of dots is carried out by the interlace method with a reduced number of working nozzles in the second area. This decreases each amount of sub-scan and thereby reduces an error in sheet feeding. The method of enabling each raster line to be formed with different nozzles or the method of creating large dots having a greater diameter may also be applied to form raster lines in the second area. Single or combined application of these techniques significantly improves the picture quality in the second area.