Konica Minolta Business Technologies, Inc.

Konica Corporation

Yoshihiko Eto

Shigeaki Tokutake

Hiroshi Yamazaki

Akihiko Itami

Masao Asano

Takeo Oshiba

Yoshiaki Takei

Eiichi Sakai

Kimiyuki Itou

Provide is an electrophotographic photoreceptor exhibiting excellent evenness of halftone images together with fine line reproduction, and an image forming method thereof, as to a photoreceptor in which an oxytitanium phthalocyanine pigment having a maximum diffraction peak at a Bragg angle (2&#x3b8;&#xb1;0.2&#xb0;) of 27.2&#xb0; in CuK&#x3b1; X-ray diffraction. Also disclosed is an electrophotographic photoreceptor possessing a body having cylindrical conductive support provided thereon photosensitive layer containing oxytitanium phthalocyanine pigment having maximum diffraction peak at a Bragg angle (2&#x3b8;&#xb1;0.2&#xb0;) of 27.2&#xb0; in CuK&#x3b1; X-ray diffraction, and flanges jointed at both ends of the body, wherein at least one of flanges is fitted with driving shaft having drive hole having at least 3 sides, and a ratio B/A of cross-sectional area B of engaging part of rotation shaft to rotate the electrophotographic photoreceptor with respect to cross-sectional area A of the drive hole is 0.890-0.998.

Electrophotographic photoreceptor and image forming method

An organic photoreceptor, comprising a conductive support, an intermediate layer provided on the conductive support, having a thickness of 6 to 25 &#x3bc;m and containing inorganic particles having a number average primary particle diameter of 5 to 200 &#x3bc;m; and a photosensitive layer provided on the intermediate layer and having a thickness of 8 to 18 &#x3bc;m, wherein the thickness of the intermediate layer is larger than that of the photosensitive layer.

Organic photoreceptor, image forming apparatus, image forming method and process cartridge

An image forming method, comprising the steps of: charging uniformly a surface of an organic photoreceptor while rotating the organic photoreceptor; exposing the charged surface of the photoreceptor with a light beam having a wavelength in the range of 350 nm to 500 nm in a main scanning direction to form a dot-shaped electrostatic latent image on the photoreceptor; and developing the dot-shaped electrostatic latent image with toner to form a dot-shaped toner image on the photoreceptor so as to satisfy the following formulas:1.1&#x2266;B/A&#x2266;1.5 and 10&#x2266;A&#x2266;50,where A is the length (&#x3bc;m) of an exposed dot of the dot-shaped electrostatic latent image in the main scanning direction, and B is the length (&#x3bc;m) of a toner dot of the dot-shaped toner image in the main scanning direction.

Image forming method and image forming apparatus

The improved photoreceptor has a light-sensitive layer that contains as carrier generation materials both a polycylic quinone compound selected from among specified anthanthrone pigments, dibenzpyrene pigments and pyranthrone pigments and a specified bisazo pigment, and that also contains a specified stilbene compound as a carrier transport material. This photoreceptor has good spectral sensitivity characteristics over a broad range of wavelengths, has high sensitivity, has a long cycle life on account of reduced residual potential, is adapted for fast copying processes, and is capable of copying red images with improved fidelity of reproduction.

Growing community of inventors

Hachioji, Japan

Yoshihiko Eto