Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Radiation-sensitive composition or product
Reexamination Certificate
1999-10-12
2001-04-17
Rodee, Christopher (Department: 1753)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Radiation-sensitive composition or product
Reexamination Certificate
active
06218062
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a photoreceptor useful for an electrostatographic printing machine.
BACKGROUND OF THE INVENTION
Benzimidazole perylene particles are a known extrinsic charge generating material that can be employed in a charge generating layer of a photoreceptor. Photogenerated charge carriers need to be brought out of the surface of the benzimidazole perylene particles before the charge carriers recombine and move into the charge transport layer under the applied electric field. The process is slowed down in certain types of binder resin employed in the charge generating layer, especially at low electric field. Therefore, the photoinduced discharge curve (“PIDC”) gets softer at low electric field. Soft PIDC means that as the exposure light energy is increased, the amount of surface voltage change due to the exposure of the photoreceptor to light is proportionally less. Such a soft PIDC will require a more powerful light source for imaging. Thus, there is a need, which the present invention addresses, for a more sensitive photoreceptor. A photoreceptor with enhanced sensitivity will reduce the need to employ a more powerful light source, thereby reducing cost.
Conventional photoreceptors and their materials are disclosed in Katayama et al., U.S. Pat. No. 5,489,496; Yashiki, U.S. Pat. No. 4,579,801; Yashiki, U.S. Pat. No. 4,518,669; Seki et al., U.S. Pat. No. 4,775,605; Kawahara, U.S. Pat. No. 5,656,407; Markovics et al., U.S. Pat. No. 5,641,599; Monbaliu et al., U.S. Pat. No. 5,344,734; Terrell et al., U.S. Pat. No. 5,721,080; and Yoshihara, U.S. Pat. No. 5,017,449.
Conventional charge blocking layers are also disclosed in U.S. Pat. No. 4,464,450; U.S. Pat. No. 5,449,573; U.S. Pat. No. 5,385,796; and Obinata et al, U.S. Pat. No. 5,928,824.
SUMMARY OF THE INVENTION
The present invention is accomplished in embodiments by providing a photoreceptor comprising:
(a) a substrate;
(b) a charge generating layer including a binder, a n-type charge generating material, and a plurality of needle shaped n-type particles; and
(c) a charge transport layer, wherein the charge generating layer and the charge transport layer are in any sequence over the substrate.
REFERENCES:
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patent: 5449573 (1995-09-01), Aoki et al.
patent: 5489496 (1996-02-01), Katayama et al.
patent: 5641599 (1997-06-01), Markovics et al.
patent: 5656407 (1997-08-01), Kawahara
patent: 5721080 (1998-02-01), Terrell et al.
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Chemical Abstracts 103:169852, 2000.*
Borsenberger, Paul M. et al. Organic Photoreceptors for Imaging Systems. New York: Marcel-Dekker, Inc. pp. 330-338, 1993.*
Huoy-Jen Yuh and Zhilei Wang, “Blocking Layer with Needle Shaped Particles”, Serial No. 09/416840 (D/97389Q).
Chambers John S.
Yuh Huoy-Jen
Rodee Christopher
Soong Zosan S.
Xerox Corporation
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