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. 31, 1995
Filed:
Nov. 09, 1993
Hiroaki Suzuki, Yokohama, JP;
Naofumi Ueda, Urayasu, JP;
Ricoh Company, Ltd., Tokyo, US;
Abstract
A tone determining apparatus for determining tones of edge pixels of vector data, is especially suitable for use within an image forming apparatus of the type writing an image on a photoconductive drum by controlling a scanning beam by pulse width modulation (PWM). The tone determining apparatus involves dividing the edge pixels of the vector data, and then transforming the area of a trailing portion into a tone using a greater contribution ratio than a contribution ratio used when transforming the area of a leading portion, whenever the edge pixel is divided in a main scanning direction. The tone determining apparatus thus eliminates fine dots otherwise appearing at the leading portion, thus providing smoother edges.