Browse Prior Art Database

Toner Concentration Control

IP.com Disclosure Number: IPCOM000038680D
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Barth, FC: AUTHOR [+3]

Abstract

The toner concentration within the magnetic brush developer of a xerographic copier or printer is changed by a key operator by means of a control key which operates to change the development electrode bias voltage on the developer rolls, but only during the concentration network's test patch cycle. This control key is interlocked so that it is available only to the key operator, as by the use of a number code which must be entered by use of the copier's copy number keys. As a result, the key operator may set the copy density as desired, leaving it to each individual user thereafter to select the copy contrast as desired, by the use of the copier's lighter-copy and darker-copy keys. The toner concentration patch sensing means to be used can be the one described in U. S. Patent 4,466,731.

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Toner Concentration Control

The toner concentration within the magnetic brush developer of a xerographic copier or printer is changed by a key operator by means of a control key which operates to change the development electrode bias voltage on the developer rolls, but only during the concentration network's test patch cycle. This control key is interlocked so that it is available only to the key operator, as by the use of a number code which must be entered by use of the copier's copy number keys. As a result, the key operator may set the copy density as desired, leaving it to each individual user thereafter to select the copy contrast as desired, by the use of the copier's lighter-copy and darker-copy keys. The toner concentration patch sensing means to be used can be the one described in U. S. Patent 4,466,731. The density of toner which will be deposited on the photoconductor's test patch area during a concentration test patch cycle is a function of (1) the photoconductor's test patch area charge voltage, (2) the concentration of toner in the developer, and (3) the development electrode bias voltage on the development roll(s) of the developer. If the key operator desires to increase toner concentration, in order to thereafter produce more dense (i.e., blacker) copies, the bias voltage is increased (i.e., made more nearly equal to the photoconductor's test patch voltage), but only during the test patch cycle. As a result, the test patch will develop to a less...