Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Radiation-sensitive composition or product
Reexamination Certificate
2000-01-26
2001-08-28
Goodrow, John (Department: 1753)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Radiation-sensitive composition or product
C399S164000, C399S117000
Reexamination Certificate
active
06280894
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to image forming and image transfer apparatus especially for use in electrostatic imaging using a sheet type photoreceptor.
BACKGROUND OF THE INVENTION
Organic photoreceptor materials for use in toner imaging are well known. In some systems the organic photoreceptor is coated onto a drum or endless belt on which an electrostatic image is formed. In other systems a sheet of photoreceptor material is mounted onto a drum to provide the same function.
WO 96/07955 published Mar. 14, 1996 and assigned to the same assignees as the present application describes a photoreceptor having an underlying dust masking layer, preferably of paper.
SUMMARY OF THE INVENTION
The present invention seeks to provide, in a first aspect thereof, improved image forming apparatus utilizing a new sheet photoreceptor configuration.
The present invention further seeks to provide, in a second aspect thereof, an improved sheet photoreceptor for use in such apparatus.
There is thus provided, in accordance with a preferred embodiment of the invention, a method of pre-conditioning an organic photoreceptor, comprising:
a) providing an organic photoreceptor having a residue of organic material thereon; and
b) applying a solubilizing agent which solubilizes the organic material, preferably together with a solvent, to the photoreceptor surface.
Preferably, the method includes heating the organic photoreceptor by an amount operative to aid in removing the organic material.
Preferably, the method further includes removing the solubilizing agent from the photoreceptor surface.
In a preferred embodiment the agent comprises a surfactant. Preferably the surfactant comprises Polyolifin Amide Alkeneamine and/or Amaco 9040.
In a preferred embodiment of the invention the organic material is a conductive material. Preferably, the organic material is Charge Transport Material. Preferably, the organic material is a surface contaminant.
There is further provided, in accordance with a preferred embodiment of the invention, a photoreceptor system for mounting on a drum comprising:
a photoreceptor sheet comprising a backing layer, a conductive layer and a photoconductive layer; and
an underlayer comprising a layer of cloth.
In a preferred embodiment of the invention the layer of cloth is a layer of open weave cloth.
Preferably, the system includes an adhesive layer on the side of the underlayer opposite the cloth layer.
Preferably, the underlayer comprises a resilient layer attached to the cloth layer. Preferably, the resilient layer is a rubber layer. Preferably, the resilient layer has a Shore A hardness of between 20 and 30.
In a preferred embodiment of the invention the resilient layer does not fill the weave in the cloth.
In a preferred embodiment of the invention, the cloth layer comprises a polyester material. Alternatively or additionally, the cloth layer comprises a nylon material.
In a preferred embodiment of the invention, the cloth is formed of thin threads of material taken in groups to produce the weave. Preferably, the threads have a diameter of less than about 5% of the warp repeat of the cloth. Preferably, the repeat of the weave of the cloth is between about 230 micrometers and about 320 micrometers in at least one direction. Preferably, threads used to form the weave fill less than about 70% of the weave in at least one direction.
There is further provided, in accordance with a preferred embodiment of the invention, a photoreceptor system for mounting on a drum comprising:
a photoreceptor sheet comprising a backing layer, a conductive layer and a photoconductive layer; and
an underlayer comprising a layer of sponge material.
There is further provided, in accordance with a preferred embodiment of the invention, a method for attaching a photoreceptor system to a drum comprising:
providing a photoreceptor system according to any of the above definitions; and
attaching the photoreceptor system to the drum with the underlayer between the photoreceptor and the drum.
In a preferred embodiment of the invention, the underlayer is adhered to the drum.
There is further provided, in accordance with a preferred embodiment of the invention, an underlayer for a photoreceptor comprising a cloth layer.
In a preferred embodiment of the invention the layer of cloth is a layer of open weave cloth.
Preferably, the underlayer includes an adhesive layer on the side of the underlayer opposite the cloth layer.
Preferably, the underlayer comprises a resilient layer attached to the cloth layer. Preferably, the resilient layer is a rubber layer. Preferably, the resilient layer has a Shore A hardness of between 20 and 30.
In a preferred embodiment of the invention the resilient layer does not fill the weave in the cloth.
In a preferred embodiment of the invention, the cloth layer comprises a polyester material. Alternatively or additionally, the cloth layer comprises a nylon material.
In a preferred embodiment of the invention, the cloth is formed of thin threads of material taken in groups to produce the weave. Preferably, the threads have a diameter of less than about 5% of the warp repeat of the cloth. Preferably, the repeat of the weave of the cloth is between about 230 micrometers and about 320 micrometers in at least one direction. Preferably, threads used to form the weave fill less than about 70% of the weave in at least one direction.
There is further provided, in accordance with a preferred embodiment of the invention, an underlayer for a photoreceptor comprising a sponge rubber layer.
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patent: 5119133 (1992-06-01), Swain
patent: 5669045 (1997-09-01), Swain
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patent: 39 13 613 A1 (1989-11-01), None
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patent: 3-45956 (1991-02-01), None
patent: 4-042232 (1992-05-01), None
patent: 5-006018 (1993-05-01), None
patent: WO 91/17485 A1 (1991-11-01), None
patent: WO 96/07955 (1996-03-01), None
Almog Yaacov
Gutfarb Judith
Landa Benzion
Rosen Yosef
Fenster & Company Patent Attorneys Ltd.
Goodrow John
Indigo NV
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