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:
Feb. 06, 2001
Filed:
Apr. 07, 1995
Eiichi Sasaki, Sagamihara, JP;
Tsuyoshi Deki, Koshigaya, JP;
Nobuo Iwata, Sagamihara, JP;
Takeshi Motohashi, Kawasaki, JP;
Takahiro Tamiya, Tokyo, JP;
Yutaka Shio, Tottori, JP;
Tomonori Yabuta, Tottori, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A color image forming apparatus capable of superposing toner images of respective colors in accurate register by preventing an exposing position from being displaced in the subscanning direction. The rotation phase of a polygonal mirror is controlled on the basis of the mark detection timing of a mark sensor. Hence, the exposing position in the subscanning direction is prevented from being displaced without regard to irregularities in the circumferential length and feed speed of an intermediate image transfer belt.