Photoreceptor surface layer comprising secondary electron emitting material
AssigneeXerox Corporation
InventorsGregory McGuire, Vladislav Skorokhod
Life of this patent
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Abstract
Presently disclosed embodiments relate to an improved electrophotographic imaging member or photoreceptor comprising a surface layer on the photoreceptor, where the surface layer comprises secondary electron emitting materials that act as a robust electrically active layer. Photoreceptors incorporating such materials into or on the surface will exhibit an increase photoreceptor life and also a reduction the operating voltage of bias charge roll (BCR) charging systems while maintaining excellent charge uniformity.
Claims14
A photoreceptor comprising:
- a charge transport layer;
- a surface layer disposed on the charge transport layer;
- wherein the surface layer comprises a secondary emitting material having a high secondary electron emission coefficient (γ);
- wherein the secondary emitting material comprises a high γ form of magnesium oxide;
- wherein the photoreceptor surface layer comprising the secondary electron emitting material has a thickness of from about 1,000 Å to about 2,000 Å.
A photoreceptor comprising
- a substrate;
- a charge generation layer disposed on the substrate;
- a charge transport layer disposed on the charge generation layer;
- an overcoat layer disposed on the charge transport layer;
- and
- a surface layer disposed on the overcoat layer, wherein the surface layer comprises a secondary electron emitting material and having a thickness of from about 2,000 Å to about 5,000 Å;
- wherein both the charge transport layer and the overcoat layer comprise a secondary emitting material having a secondary electron emission coefficient (γ) higher than that of the surface layer and having a high sputter resistance;
- wherein the secondary emitting material comprises a high γ form of magnesium oxide.
An image forming apparatus for forming images on a recording medium comprising:
- a) a photoreceptor having a charge retentive-surface for receiving an electrostatic latent image thereon, wherein the photoreceptor comprises
- a substrate;
- an optional undercoat layer disposed on the substrate;
- a charge generation layer disposed on the undercoat layer;
- a charge transport layer disposed on the charge generation layer;
- and
- a surface layer disposed on the charge transport layer, wherein the surface layer of the photoreceptor comprises a secondary emitting material having a high secondary electron emission coefficient (γ) and having a high sputter resistance;
- wherein the secondary emitting material comprises a high γ form of magnesium oxide;
- wherein the photoreceptor surface layer has a thickness of from about 1,000 Å to about 2,000 Å;
- b) a development component for applying a developer material to the charge-retentive surface to develop the electrostatic latent image to form a developed image on the charge-retentive surface;
- c) a transfer component for transferring the developed image from the charge-retentive surface to a copy substrate;
- and
- d) a fusing component for fusing the developed image to the copy substrate.
Dependencies are inferred from the claim text.