Browse Prior Art Database

Edge Erase for Copiers

IP.com Disclosure Number: IPCOM000052305D
Original Publication Date: 1981-May-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Nilsson, BA: AUTHOR [+2]

Abstract

An edge erase lamp, lens, and mask assembly for copiers is shown. The mask is arranged with a slanted portion to provide a graduated illumination of the sheet edge and to prevent "splash-over" illumination of the copy image.

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Edge Erase for Copiers

An edge erase lamp, lens, and mask assembly for copiers is shown. The mask is arranged with a slanted portion to provide a graduated illumination of the sheet edge and to prevent "splash-over" illumination of the copy image.

Specifically in Fig. 1, a photoconductor (PC) drum 10 is initially charged and then exposed to an image which discharges portions of the drum. The photoconductor is normally wider than the image and, if not erased, might leave black edges on each copy. Hence, an edge erase lamp 11 and lens 12 are employed on each side of the drum to illuminate the edges of the photoconductor.

As shown in Figs. 2 and 3, the present improvement is a mask 14, slanted to provide less light toward the document area. This reduces the exposure time of the photoconductor nearer the drum, thereby reducing the amount of discharge. The result is that off-white originals produce normal-looking copies having no white streak along the edges. Also, because the lamp and lens assembly are not parallel to the drum surface, the possibility exists that the erase illumination will "splash over" onto the imaged portions of the photoconductor. Having the slanted portion of the mask 14 toward the wider side of the lens-to-drum gap blocks light that might otherwise "splash over", thus leaving the image intact.

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