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PHOTORECEPTOR STRUCTURE TO ELIMINATE THE CHARGING STEP FOR THE DIPOLE DEVELOPMENT PROCESS

IP.com Disclosure Number: IPCOM000024499D
Original Publication Date: 1980-Oct-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 84K

Publishing Venue

Xerox Disclosure Journal

Abstract

The dipole development process develops uncharged toner into an image using a spatially modulated charge pattern to attract toner through dipole forces. This spatially modulated charge pattern is accomplished by screening the image, either simultaneous or sequential screening can be used. A typical embodiment of this technique is to charge the photoconductor, expose it to a screen, and then expose the image. This proposal eliminates the charging step and the screen exposure step.

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XEROX DISCLOSURE JOURNAL

Proposed Classification
U.S. C1. 430/31
Int. Cl. G03g 13/00

Richard F. Koehler

The dipole development process develops uncharged toner into an image using a spatially modulated charge pattern to attract toner through dipole forces. This spatially modulated charge pattern is accomplished by screening the image, either simultaneous or sequential screening can be used. A typical embodiment of this technique is to charge the photoconductor, expose it to a screen, and then expose the image. This proposal eliminates the charging step and the screen exposure step.

The spatially modulated fields necessary to achieve dipole development can be produced through a structure of intermeshed fingers (on an insulating substrate) which compose two electrodes electrically biased with respect to each other.

This substrate/electrode configuration is overcoated with a photoconducting layer isolated from the electrodes by a blocking layer. When a bias is applied betwee'n the electrodes, the dipole development fields are present above the photo- conductor. When imagewise exposed, charge flow in the light exposed areas neutralizes the electrode-imposed fields leaving development fields only in the non- exposed regions.

After development by typical dipole development methods, the toner is transferred to paper from the photoconductor. Transfer is enhanced by removing the electrode bias at the time of transfer, thus removing the dipole toner holding force. Shorting...