Browse Prior Art Database

Erase Lamp Sequencing

IP.com Disclosure Number: IPCOM000087043D
Original Publication Date: 1976-Dec-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Botte, AJ: AUTHOR

Abstract

The photoconductor erase lamps of this xerographic copier are accurately sequenced in a manner to prevent "double erasure". Double erasure, particularly within the photoconductor's working area, may degrade copy quality.

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Erase Lamp Sequencing

The photoconductor erase lamps of this xerographic copier are accurately sequenced in a manner to prevent "double erasure". Double erasure, particularly within the photoconductor's working area, may degrade copy quality.

In Fig. 1, the entire surface of photoconductor drum 10 is first charged. Thereafter, a portion of the photoconductor is discharged at the illumination station, where the light reflected off an original document to be copied strikes the photoconductor. The unused interimage and end portions of the photoconductor are now erased by lamp illumination. Thereafter, the photoconductor's latent image of the original document is toned in the developer, and the developed image is then transferred to a sheet of plain paper.

Fig. 2 shows the photoconductor of drum 10 unrolled. The direction of photoconductor movement is represented by arrow 11. Since this copier is of the type wherein the operator may select either long or short paper for use in making a copy, the photoconductor's working area is variable either 12, 13, 14, 17 or 12, 13, 15, 16.

Interimage erase lamp 18 spans the length of drum 10. End erase lamps 19 and 20 span the distance D, 13 and F, 15, respectively. End erase lamp 21 spans the distance 14, 15.

The sequencing or on/off energization of these lamps is controlled by network 22, as this network is in turn controlled by drum position sensor 23 and paper size selection intelligence 24.

The control is such that lamp 18 i...