摘要:
Disclosed is a photoreceptor for electrophotography comprising a carrier generation layer and a charge transport layer. The organic charge generating substance has, at the time of positive charging, a photosensitivity less than the photosensitivity at the time of negative charging.
摘要:
A photoconductive screen includes a conductive screen substrate with many perforations therein, an insulating layer formed substantially on one side of the screen substrate, a biasing conductive layer substantially covering the insulating layer, and a photoconductive layer substantially covering the conductive layer. An image of electrostatic charges can be formed on the screen to control a flow of charged particles for formation of an electrostatic latent image in a chargeable layer under exposure to the flow of charged particles.
摘要:
Disclosed is a photoreceptor for electrophotography comprised of a charge carrier generating material and charge transport material wherein one charge generating material is a metal phthalocyanine or a metal-free phthalocyanine. The layer containing the generator material also contains an organic amine.
摘要:
A photoreceptor for positive charging is disclosed, said photoreceptor comprising a carrier generating material which is stable against both heat and light, has high carrier generating efficiency and provides good photoconductivity over a wide wavelength range and a specific carrier transport material combined in such a manner that the shape of surface potential curves remains essentially constant over a cyclic operation and contributes to the formation of a visible image of high quality in each cycle by reducing the "memory effect", minimizing the residual potential and extending the cycle life.
摘要:
A photoreceptor including a carrier transporting layer containing a carrier transporting material and a binder material, and a carrier generating layer containing a carrier generating material and a binder material, the layers being placed one over the other in order of mention, characterized in that said carrier generating layer contains a metal-free phthalocyanine having main peaks of Bragg angles 2.theta. at least at 7.5 degrees.+-.0.2 degrees, 9.1 degrees .+-.0.2 degrees, 16.7 degrees.+-.0.2 degrees, 17.3 degrees.+-.0.2 degrees, and 22.3 degrees.+-.0.2 degrees in relation to CuK.alpha. characteristic X rays (wavelength 1.541 .ANG.), and in that said carrier generating layer also contains a carrier transporting material.
摘要:
The invention provides a method of forming an image on a photoreceptor indicating a maximum value of the differential coefficient to the exposure in the light decay curve thereof. The method comprises charging the surface of the photoreceptor; exposing uniformly the surface of the photoreceptor at the same time or substantially at the same time with the step of the charging; forming a latent image on the surface of the photoreceptor by a dot-wise image exposure; and developing the latent image on the surface of the photoreceptor.
摘要:
An electrophotographic photoreceptor having a light-sensitive layer on an electroconductive base is disclosed, the improvement wherein the light-sensitive layer is formed from a dispersion in which a titanyl phthalocyanine pigment having at least two predominant peaks of the Bragg angle 2.theta. at 9.6.degree..+-.0.2.degree. and 27.2.degree..+-.0.2.degree. in a diffraction spectrum obtained with characteristic x-rays of Cu K.alpha. at a wavelength of 1.54 .ANG. is dispersed in a dispersion medium that contains at least one of branched ester and alcohol solvents as a chief component.
摘要:
An electrophotographic image forming method is disclosed. The method comprises the steps of developing an electrostatic image formed on an image-forming member with a particulate toner for forming a toner image and transferring said toner image onto a receiving material, in which the image-forming member has a surface-improving layer comprised principally of amorphous silicon, and the toner has a weight average particle size within the range of from 1 .mu.m to 6 .mu.m and contains a constituent having a weight average particle size of not more than 5 .mu.m which accounts for not less than 20% by weight of the whole amount of the toner. An electrophotographic copy bearing a high-resolution and high-quality image can be stably obtained by this method.
摘要:
Disclosed is a light-sensitive member for electrophotography, having a charge generating phase formed by coating a dispersion comprising a charge generating substance, which contains in said charge generating phase an amine in an amount of 20-fold moles or less per mole of said charge generating substance and the solvent. Also disclosed are useful methods for the preparation of such a light-sensitive member.
摘要:
A photoreceptor that has at least a subbing layer and a light-sensitive layer formed on an electro-conductive supports is disclosed. The improvement is that said subbing layer is formed of a copolymer comprising ethylene, vinyl acetate and an unsaturated carboxylic acid and/or vinyl alcohol.