Browse Prior Art Database

IRD PATCH GENERATION

IP.com Disclosure Number: IPCOM000024703D
Original Publication Date: 1981-Oct-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 54K

Publishing Venue

Xerox Disclosure Journal

Abstract

In the control of the development system of a xerographic copier or copier/dup-licator, it is known to expose a test area of the charged photoreceptor to a controlled light source and, after development, measure the reflection density of the test area. In such control systems, it is necessary to provide a test exposure which is both uniform and repeatable. An optical densitometer test patch exposure device is shown in the figure. It consists of an array of light emitting diodes 1 optically coupled to an acrylic light bar 2 which is mounted above the surface of a photoreceptor 3. When test exposure is required, the LED'S are energized simultaneously, producing a well defined and uniformly exposed text patch on the photoreceptor immediately below the light bar.

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XEROX DISCLOSURE JOURNAL

IRD PATCH GENERATION Kathryn M. Geier
Fred F. Hubble I11
Wilbur M. Peck

Proposed Classification
U.S. CI. 350/35C Int. CI. G02b 21/20

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In the control of the development system of a xerographic copier or copier/dup- licator, it is known to expose a test area of the charged photoreceptor to a controlled light source and, after development, measure the reflection density of the test area. In such control systems, it is necessary to provide a test exposure which is both uniform and repeatable. An optical densitometer test patch exposure device is shown in the figure. It consists of an array of light emitting diodes 1 optically coupled to an acrylic light bar 2 which is mounted above the surface of a photoreceptor 3. When test exposure is required, the LED'S are energized simultaneously, producing a well defined and uniformly exposed text patch on the photoreceptor immediately below the light bar.

Volume 6 Number 5 September/October 1981 247

[This page contains 1 picture or other non-text object]

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    XEROX DISCLOSURE JOURNAL Volume 6 Number 5 September/October 1981

248

[This page contains 1 picture or other non-text object]