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ELECTRONIC FEEDBACK SYSTEM TO MINIMIZE INTERFERENCE EFFECTS (PLYWOOD) IN LAYERED PHOTORECEPTORS

IP.com Disclosure Number: IPCOM000026278D
Original Publication Date: 1991-Feb-28
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 82K

Publishing Venue

Xerox Disclosure Journal

Abstract

Under coherent illumination, a layered photoreceptor exhibits a problem called plywooding due to interference from reflections of the laser beam within the layers. The interference appears in prints as a random pattern of light and dark fringes over regions which should have uniform reflectance. The effect arises from variations in the thickness of the transport layer. As the transport layer thickness is varied, interference effects modulate the amount of light reflected at the photoreceptor surface and hence transmitted to the generator layer.

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XEROX DISCLOSURE JOURNAL

ELECTRONIC FEEDBACK SYSTEM Proposed Classification TO MINIMIZE INTERFERENCE U.S. C1.355/210 EFFECTS (PLYWOOD) IN LAYERED
PHOTORECEPTORS
Robert P. Loce
Ronald E. Jodoin
George C. Hartmann

Int. C1. G03g 15/00

Laser Intensity

I ../ Control Circuitry

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10 -7 20

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Figure 1A

10

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Figure 1B

XEROX DISCLOSURE JOURNAL - VoI. 16, No. 1 January/February 1991 31

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ELECTRONIC FEEDBACK SYSTEM TO MINIMIZE INTERFERENCE EFFECTS (PLYWOOD) IN LAYERED P HOT0 RE C E PTO RS( Cont'd)

Under coherent illumination, a layered photoreceptor exhibits a problem called plywooding due to interference from reflections of the laser beam within the layers. The interference appears in prints as a random pattern of light and dark fringes over regions which should have uniform reflectance. The effect arises from variations in the thickness of the transport layer. As the transport layer thickness is varied, interference effects modulate the amount of light reflected at the photoreceptor surface and hence transmitted to the generator layer.

Electronic feedback system 10, shown from the process direction in Figure 1A and from a fast scan direction in Figure lB, can be used to minimize the interference effects. A light detector or strip 14 can be positioned to detect reflected beam 18 which is a result of incident beam 16 reflecting off photoreceptor 12 during the output scanning p...