摘要:
An to an electrophotographic photosensitive member includes a photosensitive layer containing a specified oxytitanium phthalocyanine and a polyvinyl acetal resin having a structural unit represented by Formula: ##STR1## wherein X is a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, a nitro group, or a cyano group; and Y is a fluorine atom, a chlorine atom, a bromine atom, a nitro group, or a cyano group. The photosensitive member maintains a low residual potential without deterioration of the sensitivity during repeated use.
摘要:
An apparatus for preparing electrophotographic photosensitive members comprises a means for forming a charge generation layer by coating a charge generation layer coating solution containing two or more kinds of charge-generating materials having different maximum absorption wavelengths, wherein the apparatus further comprises a means for measuring absorbance or transmittance at the respective maximum absorption wavelengths of said coating solution to measure the mixing ratio of the respective charge-generating materials, and a means for controlling the mixing ratio by controlling the feed amount of the respective charge-generating materials.
摘要:
An electrophotographic apparatus comprises an electrophotographic photosensitive member and means for applying an electrophotographic cycle to the photosensitive member. The electrophotographic cycle includes charging, image exposure, toner development, toner transfer, remaining toner cleaning, and exposure for erasing remaining electric charge. The electrophotographic cycle application means includes abrasion means. By setting the abrasion function of the abrasion means to provide an abrasion of the surface layer of the photosensitive member at a rate of 250 .ANG.or more per 1000 electrophotographic cycles applied to the photosensitive member, the deterioration of image quality such as image-flow and fading of images caused by succession of electrophotographic cycles is effectively prevented particularly with respect to a photosensitive member with a small diameter.
摘要:
An electrophotographic photosensitive member having the structure comprising a conductive substrate laminated thereon with (i) a charge generation layer comprising two or more kinds of charge-generating materials incorporated in binder resins and (ii) a charge transport layer, wherein said charge generation layer comprises at least a first charge generating material dispersed in a first binder resin and a second charge generating material dispersed in a second binder resin, such that the binder resins in the charge generating layer are incompatible with each other.
摘要:
An electrophotographic photosensitive member having a photosensitive layer on an electroconductive substrate comprises a surface layer containing a fluorine type resin powder and a fluorine type graft polymer.
摘要:
An exposure apparatus which includes a projection optical system and exposes a substrate to radiant energy via the projection optical system, includes a temperature measuring device configured to perform measurement of a temperature of a temperature measurement portion of the projection optical system, and a controller configured to perform prediction of a change in an optical characteristic of the projection optical system based on a change in temperature measured by the temperature measuring device, and to perform processing of reduction, based on the prediction, of a change in a state of an image formed on the substrate by the projection optical system, wherein the controller is configured to perform the prediction in accordance with a second-order lag response function to the change in temperature of the temperature measurement portion.
摘要:
An optical apparatus including an image forming optical system having a movable optical element, and a driving mechanism which moves the optical element is disclosed. The apparatus comprises a first block which obtains a linear evaluation value by normalizing, by a first tolerance, an aberration expressed by a linear function of a position of the movable optical element out of aberrations of the optical system, and a quadratic evaluation value by normalizing, by a second tolerance, an aberration expressed by a quadratic function of the position out of the aberrations of the optical system, a second block which obtains a minimum value of a dummy variable by linear programming using an upper limit value of the linear evaluation value as the dummy variable, and a third block which determines a position of the optical element to be moved by the driving mechanism so as to minimize a weighted sum of the quadratic evaluation values with respect to a plurality of image heights by using, as the upper limit value of the linear evaluation value, a value prepared by adding a relaxation amount to the minimum value of the dummy variable that is obtained by the second block. The third block minimizes the weighted sum of the quadratic evaluation values by adjusting the weights assigned to the quadratic evaluation values and the relaxation amount.
摘要:
An image forming process is carried out through the steps of electrostatically charging a cylindrical electrophotographic photosensitive member, forming an electrostatic latent image by image exposure, developing the latent image and transferring the developed image to a transfer member. The photosensitive member is comprised of a conductive support and a photosensitive layer which contains oxytitanium phthalocyanine as a charge-generating material and a charge-transporting material. The charge-generating material and the charge-transporting material have a work function (W.sub.F.sup.CG) and a work function (W.sub.F.sup.CT), respectively. Those work functions satisfies the following relationship:-0.2
摘要:
An photosensitive member suitable for use in the electrophotographic apparatus of reversal development-type is formed by an electroconductive support, a charge-generation layer and a charge-transport layer disposed in this order. The charge-generation layer comprises oxytitanium phthalocyanine and the charge-transport layer is formed in a thickness of 22 microns or larger. The oxytitanium phthalocyanine is highly sensitive so that a low dark-part potential of 600V or lower (absolute) is sufficient. Because of the low dark-part potential and the thick charge transport layer, image defect, such as fog and black spots are effectively suppressed.