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:
Jul. 30, 1996
Filed:
Sep. 12, 1994
Naoki Iwata, Tokyo, JP;
Tomotoshi Nakahara, Yokohama, JP;
Hisao Murayama, Kawasaki, JP;
Ichiro Komuro, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A multicolor image forming method of the kind sequentially developing a plurality of latent images formed on an image carrier by toners of respective colors and transferring the resulting toner images to a recording medium at the same time. Development in the second color and successive colors is implemented as noncontact type development using a thin layer of nonmagnetic toner. This toner layer satisfies a condition of dt/.epsilon.t<590(.mu.m).sup.2 where dt and .epsilon.t are respectively the thickness and the average volume specific inductive capacity of the layer. The toner for the development in the second color and successive colors is produced by polymerization and has an average volume particle size of 10 .mu.m or less. Development in the first color is implemented by a toner having a relatively sharp particle size distribution, not including relatively large particles, having a sharp charge amount distribution, and not producing particles of low charges. The toner for the development in the first color has a smaller average particle size than the toner for the development in the second and successive colors.