Browse Prior Art Database

DIALABLE MTF ENABLED BY DUAL SCAVENGELESS DEVELOPMENT

IP.com Disclosure Number: IPCOM000027333D
Original Publication Date: 1996-Apr-30
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 114K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a method for "dialing" a development modulation transfer function (MTF) by adjusting the AC amplitude and frequency on a donor roll in a dual AC scavengeless development system. The new method enables operator control of the development MTF without having to change the background deposition or solid area density.

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XEROX DISCLOSURE JOURNAL

DIALABLE MTF ENABLED BY DUAL SCAVENGELESS U.S. C1.355/246 DEVELOPMENT Int. C1. G03g 21/00 Merlin E. Scharfe
Dan A. Hays

Proposed Classification

Disclosed is a method for "dialing" a development modulation transfer function (MTF) by adjusting the AC amplitude and frequency on a donor roll in a dual AC scavengeless development system. The new method enables operator control of the development MTF without having to change the background deposition or solid area density.

In making copies with a light lens xerographic copier, the operator can control the lightness or darkness of the copy with a density control. If the original contains undesired low-density fine lines or paste-up edges, the operator can set the density control to a light setting for suppressing the image detail. If, however, the reproduction of image detail is desired, the density control can be adjusted to a dark setting. In most xerographic copiers, the density control is achieved by changing the DC bias on the development system. For a light density setting, the bias is shifted towards the dark potential on the photoreceptor whereas for a light density setting the bias is shifted towards the background potential. Unfortunately, this control method also causes a corresponding reduction in the solid area density for the light density setting, and increased background deposition for the high density setting. A control method is desired in which the development of image detail such as fine lines can be either enhanced or suppressed without changing the solid area or background development. This is equivalent to controlling the spatial frequency dependence of the development modulation transfer function.

In a dual AC scavengeless development system, the donor roll can be toned with either a single component toner meteringkharging process or a two component development system to load a toner layer on the donor roll. The...