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. 07, 1992
Filed:
Oct. 29, 1990
E Neal Tompkins, Atlanta, GA (US);
Jack N Bartholmae, Duluth, GA (US);
Colorocs Corporation, Norcross, GA (US);
Abstract
A method for measuring and adjusting the toner density of black toner in a multi-color copy machine includes first developing and transferring a layer of yellow toner (132) onto the surface of a transfer belt (18). A crosshatch pattern (134) of black toner is then developed and transferred onto the surface of the yellow toner layer (132) in a series of patches (138)-(148). The cross-hatch pattern (134) is comprised of vertical and horizontal bars (136) that are spaced a predetermined distance apart and have a predetermined width. A toner density sensor (40) is disposed over the surface of the transfer belt (18) to measure the toner density. The amount of toner deposited on a photoreceptor belt (12) is altered by varying the grid voltage on a charging corona (28) during the developing step to provide multiple toner densities for each of multiple patches (138)-(148). This data is then extrapolated to determine what the grid voltage on the charging corona (28) should be for the desired toner density.