Electrographic photoreceptor, image forming apparatus, and electrographic cartridge

Abstract

An electrographic photoreceptor has an underlying layer, which is formed on a conductive support and contains metal oxide particles and a binder resin, and a photosensitive layer formed on the underlying layer. In order to provide the electrographic photoreceptor with high sensitivity and a low residual potential, the underlying layer is so formed that the volume average particle diameter, measured by a dynamic light scattering method, of the metal oxide particle in a solution dispersed in a solvent including methanol and 1-propanol mixed with a weight ratio of 7:3 is made at most 0.1 [mu]m and the cumulative 90% particle diameter is made at most 0.3 [mu]m. In addition, the photosensitive layer includes crystalline phthalocyanine having one or more clear main diffraction peaks at Bragg angles (2theta +- 0.2 DEG) of 27.0 DEG to 29.0 DEG in an X-ray diffraction spectrum.

Description

technical field [0001] The present invention relates to an electrophotographic photoreceptor having an undercoat layer, and an image forming device and an electrophotographic cartridge using the electrophotographic photoreceptor. Background technique [0002] Since electrophotographic technology can obtain immediacy, high-quality images, etc., this technology has been widely used not only in the field of copiers but also in various printer fields in recent years. For the electrophotographic photoreceptor (hereinafter referred to as "photoreceptor" when appropriate), which is the core of electrophotography technology, people are developing organic photoreceptors using organic photoconductive materials as their photoconductive materials, which are compatible with inorganic photoconductive materials. Compared with organic materials, organic photoconductive materials have the advantages of being pollution-free and easy to manufacture. [0003] Generally, an organic photorecepto...

AI Technical Summary

Problems solved by technology

However, in the electrophotographic photoreceptors using these phthalocyanines, the chargeability of the electrophotographic photoreceptors may decrease with the repeated use of the electrophotographic photoreceptors.

[0023] In particular, when the above electrophotographic photoreceptor is used in an imaging device for reverse development, due to the increase in blur and black spots, the stability of electrical characteristics is required due to the increase in imaging speed and high image quality in recent years. And the improvement of image quality, etc. (for example, when black point reduction, blurring, repeated stability, etc. are required), sometimes the requirements cannot be fully met.

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