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:
Sep. 03, 1985
Filed:
Jan. 19, 1984
Norimasa Soumiya, Soka, JP;
Ricoh Company, Ltd., , JP;
Abstract
An electrophotographic copying machine capable of suppressing the formation of phantom images with a simple structure is provided. The machine includes a pre-transfer exposure lamp for irradiating a toner image formed on an imaging surface and a post-transfer exposure lamp for irradiating the imaging surface after separation of a transfer medium, to which the toner image has been transferred, from the imaging surface. The pre-transfer exposure lamp is provided to ease the transfer of toner image to the transfer medium and the post-transfer exposure lamp is provided to remove residual charge from the imaging surface thereby preparing the imaging surface ready to be used for the next cycle of copy operation. In the present invention, a ratio of light amount of the post-transfer exposure to the light amount of the pre-transfer exposure is maintained within a predetermined range, preferably 30-60%.