Fuji Electric Imaging Device Co., Ltd.

Fuji Electric Co., Ltd.

Shinichi Omokawa

Masaru Takeuchi

Kenichi Ohkura

Yoshihiro Ueno

Seizo Kitagawa

Seishi Terasaki

Kenji Kawate

Positive charging single-layer organic photoreceptor for liquid development

An electrophotographic photoconductor which is a positive charging, single layer type organic photoconductor including a conductive substrate; and a photosensitive layer which is provided on the conductive substrate, which is a positive charging, single layer type organic photoconductor, and which is composed of at least one charge generation substance that contains a phthalocyanine pigment; a positive hole transport substance; an electron transport substance; and a binder that contains a polycarbonate resin with a polydialkylsilozane constructed of a repeated unit represented by formula (1). Toner consumption during repeated electrophotographic use is reduced and print defects including dirty background suppressed.

Electrophotographic photoconductor

In a electrophotographic photoconductor having a single layer type photosensitive layer,laminated directly or through an undercoat layer,on an electroconductive substrate,, the single layer type photosensitive layer,contains at least a resin binder, a charge generating substance, a hole transfer substance and an electron transfer substance, wherein the hole transfer substance is a compound represented by the general formula (HT1) shown below and an electrophotographic apparatus comprise this photoconductor. This electrophotographic photoconductor has good electric property in positive charge and good stability in repeated use.

Electrophotographic photoconductor and electrophotographic apparatus

An organic electrophotographic photoconductor diminished in an image trouble due to history of a transfer process in a reversal development system is disclosed. The above organic electrophotographic photoconductor is called a separated-function laminated type organic electrophotographic photoconductor, which has an undercoat layer and a photosensitive layer laminated in this order on a conductive substrate, the photosensitive layer comprising a charge generation layer laminated on the undercoat layer and containing an organic compound, and a charge transport layer laminated on the charge generation layer and containing an organic compound. For the charge generation layer, a titanyloxyphthalocyanine compound is used as a charge generation material. The present invention uses the titanyloxyphthalocyanine compound having a clear diffraction peak at a Bragg angle (2.theta.) of 9.6.degree..+-.0.2.degree. or 27.3.degree..+-.0.2.degree. for CuK.alpha. characteristic X-ray (wavelength 1.541 .ANG.). For the charge transport layer, a specific organic compound is used as a charge transport material.

Electrophotographic photoconductor and electrophotographic device using

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Matsumoto, Japan

Shinichi Omokawa