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RETROREFLECTOR TO MINIMIZE INTERFERENCE EFFECTS IN LAYERED PHOTORECEPTORS

IP.com Disclosure Number: IPCOM000026239D
Original Publication Date: 1990-Dec-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 95K

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 random patterns of light and dark fringes over regions which should have uniform reflectance. The effect arises from variations in the thickness of the amount of light reflected at the photoreceptor surface and hence transmitted to the generator layer. Proposed is a method to even out the light absorbed in the generator layer by sending the reflected beam back in.

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XEROX DISCLOSURE JOURNAL

RETROREFLECTOR TO MINIMIZE Proposed Classification INTERFERENCE EFFECTS IN US. C1.355/210 LAYERED PHOTORECEPTORS
Ronald E. Jodoin
Robert P. Loce
George
C. Hartmann

Int. C1. G03g 15/00

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XEROX DISCLOSURE JOURNAL - Vol15 No 6 NovembedDecember 1990 451

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RETROREFLECTOR TO MINIMIZE INTERFERENCE EFFECTS IN LAYERED PHOTORECEPTORS(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 random patterns of light and dark fringes over regions which should have uniform reflectance. The effect arises from variations in the thickness of the amount of light reflected at the photoreceptor surface and hence transmitted to the generator layer. Proposed is a method to even out the light absorbed in the generator layer by sending the reflected beam back in.

Figure 1 is a process directional view of an optical system 10 comprising a reflector 12, an incident beam 14, a reflected beam 16 and a photoreceptor 18. An appropriately shaped reflector 12 is proposed as a passive means of sending reflected beam 16 back to photoreceptor 18 for another pass through the absorbing layer. The optical system 10 will have the effect of reducing the absorption modulation in the genera...