Patent · US Expired

Printing and photocopying device and method whereby one toner mark is scanned at at least two points of measurement

US6434346B1 · kind B1 · utility

5Cited by

2References

33Claims

0Family size

Assignee

Océ Printing Systems GmbH · DE

Inventors

Joseph Knott · Tutzing, DE
André Schwarkopf · Pliening, DE
Peter Bremmer · Weingarten, DE

Key dates

Filing date	Feb 14, 2001
Grant date	Aug 13, 2002
Priority date	—
Expiry date	Feb 14, 2021

Classification

Technology area (CPC G)Physics
CPC primaryG03G2215/00042
WIPO fieldOptics
WIPO sectorInstruments

Abstract

The invention relates to an electrographic printing or photocopying device and method. A toner mark (10) is provided on a photoconductive drum and printed with toner using a developing station. The toner mark (10) is scanned by a sensor at two points of measurement (a1,a2). The amount of toner in a developing mixture consisting of two components depends upon the difference (&Dgr;U) or the quotient of the amount of the signals of the sensor at both points of measurement. A device which is also disclosed enables the exact length of the toner mark (10) to be determined.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.