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Single Cycle Multi-color Electrophotographic Printing using Photoconducting Toner

IP.com Disclosure Number: IPCOM000108519D
Original Publication Date: 1992-Jun-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 1 page(s) / 31K

Publishing Venue

IBM

Related People

Diaz, A: AUTHOR [+4]

Abstract

Photoconducting toners are used in conjunction with a recharge corona step that also incorporates a light source of a wavelength chosen to activate conductivity in the toner but not to affect the photoconductor layer. The use of the photoconducting toner eases the recharge corona step required for sequential development of a single-cycle multi-color electrophotographic printing process. In operation the layers of toner are deposited in sequence upon the photoconductor layer as described in (*). After each layer of toner has been deposited, it is necessary to recharge the photoconductor prior to the next exposure and development steps. By combining a light source with the corona system photoactivate the toner, the excess charge on the toner can be dissipated to the photoconductor drum or belt.

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Single Cycle Multi-color Electrophotographic Printing using Photoconducting Toner

       Photoconducting toners are used in conjunction with a
recharge corona step that also incorporates a light source of a
wavelength chosen to activate conductivity in the toner but not to
affect the photoconductor layer.  The use of the photoconducting
toner eases the  recharge corona step required for sequential
development of a single-cycle multi-color electrophotographic
printing process.  In operation the layers of toner are deposited in
sequence upon the photoconductor layer as described in (*).  After
each layer of toner has been deposited, it is necessary to recharge
the photoconductor prior to the next exposure and development steps.
By combining a light source with the corona system photoactivate the
toner, the excess charge on the toner can be dissipated to the
photoconductor drum or belt.  The corona is, therefore, able to
recharge the photoconductor without a large excess charge buildup on
the toner.  The toner is an insulator during development and a
photoconductor during the corona charging step.

      Reference
(*)  M. Kohyama, et al., J . Imaging Technology 12, 47 (1986).