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. 23, 1990
Filed:
Apr. 07, 1989
Akira Shimada, Hitachi, JP;
Tetsuro Akasaki, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A first control mark pattern, extending continuously in the scan direction of dots written onto a photo sensitive drum in a printer and cut in pieces in the direction perpendicular to the scan direction, and composed of lines is formed at a predetermined position on the photosensitive drum. Similarly, a second control mark pattern composed of a pattern including components in the direction perpendicular to the scan direction is formed on a second predetermined position on the photosensitive drum. The print density is controlled so as to be a desired one in accordance with the first control mark pattern formed. The widths of lines printed in accordance with the second control mark pattern formed are controlled so as to be the same in both the scan direction and the direction perpendicular to the scan direction.