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:
Apr. 16, 1991
Filed:
Sep. 15, 1989
Takao Kumasaka, Takahagi, JP;
Yuzuru Simazaki, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Koki Co., Ltd., Tokyo, JP;
Abstract
In a multi-color LBP (laser beam printer) or a full-color LBP, two image producing elements each composed of charge-exposure-develop devices are arranged around one drum, and each of the image producing elements includes a developer capable of color changing for achieving a color change developing in every one revolution. In this way, it is made possible to practice a multicolor printing or a full-color printing in two rotations of one photosensitive drum. This printer has a higher printing speed and a smaller size of the apparatus in comparison with that of a one drum four rotation system and that of a one drum one rotation system, respectively. Further, the system includes several features common to two-color LBP printing art, making it possible to conveniently utilize the latter printing art.