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AssigneeKyocera Mita Corporation
InventorsYukikatsu Imanaka, Hiroaki Iwasaki, Yuji Tanaka, Masakatsu Hayashi
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The present invention provides a single-layer type electrophotosensitive material comprising a conductive substrate and a photosensitive layer formed on the conductive substrate, wherein the photosensitive layer contains a phthalocyanine compound as an electric charge generating material, a hole transferring material and an electron transferring material in a binder resin, and that a difference in absolute value between a plus polarity sensitivity and a minus polarity sensitivity measured under the conditions of an exposure wavelength of 780 nm and an exposure energy of 1.0 μJ/cm2 is not more than 500 V, and a reversal development type digital image forming apparatus using the electrophotosensitive material, which does not include a charge neutralizing step.
A single-layer type electrophotosensitive material comprising a conductive substrate and a photosensitive layer formed on the conductive substrate, characterized in that the photosensitive layer contains a phthalocyanine compound as an electric charge generating material, a hole transferring material and an electron transferring material in a binder resin, and that a difference in absolute value between a plus polarity sensitivity and a minus polarity sensitivity measured under the conditions of an exposure wavelength of 780 nm and an exposure energy of 1.0 μJ/cm2 is not more than 500 V.
A method of producing a single-layer type electrophotosensitive material comprising a conductive substrate and a photosensitive layer formed on the conductive substrate, the photosensitive layer containing a phthalocyanine compound as an electric charge generating material, a hole transferring material and an electron transferring material in a binder resin, characterized in that the photosensitive layer is formed by selecting the phthalocyanine compound, hole transferring material, electron transferring material and binder resin so that a difference in absolute value between a plus polarity sensitivity and a minus polarity sensitivity is not more than 500 V under the measuring conditions of an exposure wavelength of 780 nm and an exposure energy of 1.0 μJ/cm2.
Dependencies are inferred from the claim text.
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Charge-receiving layers: photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
Acyclic or carbocyclic compounds: containing oxygen
Being six-membered: containing two hetero atoms
Containing a methine or polymethine group: containing two or more methine or polymethine groups
Term ended 20 Jun 2020 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The present invention relates to a single-layer type electrophotosensitive material which is used in digital image forming apparatuses such as electrophotosensitive copying machine, facsimile and laser beam printer, and a digital image forming method using the same.
More particularly, the present invention relates to a single-layer type electrophotosensitive material, which does not generate a memory image even when using in a reversal development type digital image forming apparatus including no charge neutralizing step, and a reversal development type digital image forming method using the same, which does not include a charge neutralizing step.
Recently, an organic photosensitive material has widely been used because of its easy production, low cost, wide range of choice of photosensitive materials such as electric charge transferring material, electric charge generating material and binder resin, and high functional design freedom as compared with a conventional inorganic photosensitive material.
FIG. 1 is a graph showing a relationship between a transfer memory potential and an exposure memory potential, and a difference in absolution value of sensitivity between a plus polarity and a minus polarity of single-layer type electrophotosensitive materials of Examples and Comparative Examples.
FIG. 2 is a diagram showing an original for evaluation of a transfer memory image, and a transfer memory image.
FIG. 3 is a diagram showing an original for evaluation of an exposure memory image, and an exposure memory image.
Various materials used in the single-layer type electrophotosensitive material of the present invention will be described in detail hereinafter.
<Electric charge generating agent>
When using laser as a light source in a digital image forming apparatus, a semiconductor laser and LED are exclusively used in view of small size, cheap price and simplicity. Accordingly, an organic photosensitive material having sensitivity in a wavelength range from 700 to 850 nm is required. As the electric charge generating material which satisfies the above requirement and used in the organic photosensitive material, for example, polycyclic quinone compound, pyrylium compound, squalium compound, phthalocyanine compound and azo compound have been suggested or put into practice. In the single-layer type electrophotosensitive material of the present invention, various phthalocyanine compounds are used.