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US 5,852,455 AGranted
Image forming device, having separately energizable, inter-connected electrodes and image recording element for use, therein
AssigneeOce-Nederland B.V.
InventorsRob Adrianus Maria Van Ham, Paulus Henricus Eijmberts, Augustinus Mathias Wilhelmus Cox
Life of this patent
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Abstract
An image-forming device with a repeatedly usable image-recording element bearing a dielectric surface layer, beneath which is a system of separately energizable image-forming electrodes interconnected by a material whose resistance is between that of the dielectric surface layer and that of the image-forming electrode and is preferably a factor of 10.sup.2 -10.sup.4 lower than that of the dielectric surface layer, the dielectric surface layer and the material having the lower resistance preferably being formed as one continuous layer which bottom part has a lower resistance than in the top part.
Claims6
An image-forming device comprising:
- a movable image-recording element includes a support with a dielectric surface layer thereon, a system of separately energizable image-forming electrodes said system of separately energizable electrodes having a surface and is disposed beneath said dielectric surface layer and on a surface of said movable image recording element,
- an image-forming zone situated along a path of movement of said movable image-recording element, a counter electrode being disposed juxtapositioned above said dielectric surface of said movable image-recording element in said image-forming zone, and
- energization means for applying a voltage between said image-forming electrodes and said counter electrode in accordance with an image pattern to be recorded, in order that toner powder supplied to said image-forming zone may be deposited on the dielectric surface of said movable image-recording element in accordance with said image pattern,
- wherein said separately energizable image-forming electrodes disposed beneath said dielectric surface layer are interconnected in the movable image-recording element by a material having an electrical resistance between that of the dielectric surface layer and that of the image-forming electrodes and the electric resistance is so selected wherein an image-forming electrode that cannot be directly energized by said energization means is energized at a predetermined level, on energization of one of said separately energizable image-forming electrode nearest to said image forming zone, such that toner powder is deposited on the dielectric surface situated thereabove.
1 more element
An image-forming device comprising:
- a movable image-recording element includes a support with a dielectric surface layer thereon, a system of separately energizable image-forming electrodes said system of separately energizable electrodes having a surface and is disposed beneath said dielectric surface layer and on a surface of said movable image recording element,
- an image-forming zone situated along a path of movement of said movable image-recording element, a counter electrode being disposed juxtapositioned above said dielectric surface of said movable image-recording element in said image-forming zone,
- energization means for applying a voltage between said image-forming electrodes and said counter electrode in accordance with an image pattern to be recorded, in order that toner powder supplied to said image-forming zone may be deposited on the dielectric surface of said movable image-recording element in accordance with said image pattern, and
- the surface of said separately energizable image-forming electrodes in said image-forming element is covered by a continuous dielectric surface layer having a bottom portion and a top portion and having a resistance in said bottom portion of the continuous layer which is lower relative to a resistance in said top part of the continuous layer,
- wherein separately energizable image-forming electrodes beneath said dielectric surface layer are interconnected in the movable image-recording element by a material having an electrical resistance between that of the dielectric surface layer and that of the image-forming electrodes and the electric resistance is so selected wherein an image-forming electrode that cannot be directly energized by said energization means is energized at a predetermined level, on energization of one of said separately energizable image-forming electrode nearest to said image-forming zone, such that toner powder is deposited on the dielectric surface situated thereabove.
2 more elements
An image-forming device comprising:
- a movable image-recording element includes a support with a dielectric surface layer thereon, a system of separately energizable image-forming electrodes said system of separately energizable electrodes having a surface and is disposed beneath said dielectric surface layer and on a surface of said movable image recording element,
- an image-forming zone situated along a path of movement of said movable image-recording element, a counter electrode being disposed juxtapositioned above said dielectric surface of said movable image-recording element in said image-forming zone,
- energization means for applying a voltage between said image-forming electrodes and said counter electrode in accordance with an image pattern to be recorded, in order that toner powder supplied to said image-forming zone may be deposited on the dielectric surface of said movable image-recording element in accordance with said image pattern, and
- said support, having a dielectric surface layer thereon, beneath which there is provided a system of image-forming electrodes, wherein the dielectric surface layer is in a form of a continuous layer having a bottom portion and a top portion formed from an oxide or nitride consisting of SiO.sub.x, wherein x in the bottom portion of the continuous layer is on an average of about 0.4-0.65 and in the top portion of the continuous layer on an average about 1.2-1.6, said bottom portion of said continuous layer has a resistance 10.sup.2 -10.sup.4 lower relative to said top portion of said continuous layer,
- wherein separately energizable image-forming electrodes beneath said dielectric surface layer are interconnected in the movable image-recording element by a material having an electrical resistance between that of the dielectric surface layer and that of the image-forming electrodes and the electric resistance is so selected wherein an image-forming electrode that cannot be directly energized by said energization means is energized at a predetermined level, on energization of one of said separately energizable image-forming electrode nearest to said image-forming zone, such that toner powder is deposited on the dielectric surface situated thereabove.
2 more elements
Dependencies are inferred from the claim text.