Browse Prior Art Database

ELECTRICAL DEFECT SCANNER FOR PHOTORECEPTORS

IP.com Disclosure Number: IPCOM000025897D
Original Publication Date: 1988-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 85K

Publishing Venue

Xerox Disclosure Journal

Abstract

US-A 4,204,725 to Distefano et al. discloses an arrangement for detecting and ultimately printing a latent electrostatic image detected on a photoreceptor in an electrophotographic device. Generally, a photoreceptor surface bearing an undeveloped latent image is interrogated with a laser. Upon interrogation of a charged area on the photoreceptor by the laser, an electrical discharge is produced. The discharge may be detected by a detector capacitively coupled to the photoreceptor. Knowing the position of the laser at the time when a discharge is detected enables the construction of a digital image corresponding to charged and uncharged areas of the photoreceptor. The constructed digital image may then be directed to a printer.

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XEROX DISCLOSURE JOURNAL

ELECTRICAL DEFECT SCANNER Proposed Classification FOR PHOTORECEPTORS US. C1.324172 Andrew R. Melnyk Int. C1. GOlr 31/02

US-A 4,204,725 to Distefano et al. discloses an arrangement for detecting and ultimately printing a latent electrostatic image detected on a photoreceptor in an electrophotographic device. Generally, a photoreceptor surface bearing an undeveloped latent image is interrogated with a laser. Upon interrogation of a charged area on the photoreceptor by the laser, an electrical discharge is produced. The discharge may be detected by a detector capacitively coupled to the photoreceptor. Knowing the position of the laser at the time when a discharge is detected enables the construction of a digital image corresponding to charged and uncharged areas of the photoreceptor. The constructed digital image may then be directed to a printer.

It would be highly desirable to determine the location of charge deficient spots on a photoreceptor. While normal light lens electrophotographic copying is
.relatively insensitive to charge retentive spots and the quality defects caused thereby, printers, and particularly color printers, suffer significantly deteriorated copy quality with this defect. Accordingly, it would be desirable to detect such spots when possible. Unfortunately, most testing techniques are based on the assumption that photoreceptor flaws causing copy quality defects are visible. Charge deficient spots, however, do not necess...