Fuji Electric Co., Ltd.

Fuji Electric Imaging Device Co., Ltd.

Motohiro Takeshima

Haruo Kawakami

Masami Kuroda

Yoichi Nakamura

Kei Yamaguchi

Akira Ootani

Osamu Nabeta

In an electrophotographic apparatus (e.g., a photocopier or laser printer), an electrophotographic photosensitive member (image-forming part) has a metal substrate roughened on its surface, a metal oxide-containing undercoat layer on the substrate, and an organic photosensitive layer over the undercoat. A coherent light source (e.g., laser) can cause interference fringes that degrade the printed image. Interference fringes are judged (or predicted) as follows: The surface reflectance is measured at intervals over the spectral width of the light source. The measured surface reflectance is corrected, using a mirror-surface conductive substrate as a reference, to obtain a reflectance of the photosensitive member. The reflectance is subjected to a discrete Fourier transformation, which generates a power spectrum, over the spectral width of the light source, from the reflectance as a function of the wavelength. Interference fringes are judged from the maximum peak value in the power spectrum, as compared to a predetermined value.

Electrophotographic photosensitive member

A function separated laminated electrophotography photosensitive body is equipped with at least a charge generating layer and a charge transport layer on top of a conductive substrate. A contact angle &thgr; of pure water on the charge transport layer satisfies the equation &thgr;>&equals;94&deg;. The resulting organic electrophotography photosensitive body prevents contamination of the photosensitive body surface resulting from component migration from the developing roller and achieves a stable image quality.

Electrophotography photosensitive body

A metal carboxylate of the following general Formula (I), (II), or (III), ##STR1## wherein Ar.sub.1 represents an optionally substituted arylene group, Ar.sub.2 represents one of the group consisting of an alkyl group, an optionally substituted aryl group, an aralkyl group, and a hydrogen atom, X represents a metal atom selected from the group consisting of tin, zinc, cobalt, nickel, iron, and chromium, and n represents the valence of X, is added to the charge transport layer of a photoconductor for electrophotography. The resulting photoconductor exhibits excellent electric stability in repetitive use with little variation in electrically charged potential or residual potential.

Photoconductor for electrophotography

An electrophotographic photosensitive body has a charge generating layer and a charge transporting layer on a conductive substrate. The charge transporting layer contains a zinc carboxylate compound expressed by the following General Formula (I):

Electrophotographic photosensitive body and method of manufacturing same

A photosensitive body comprises a conductive substrate; a photosensitive layer on the conductive substrate, the photosensitive layer includes a charge transport compound wherein the charge transport compound is described by a general formula (I): ##STR1## wherein A is a phenyl or naphthyl group; each of R.sup.1, R.sup.2, R.sup.3, and R.sup.4 is a hydrogen atom, a halogen atom, an alkyl group with or without substitution, an alkoxy group, an alkylamino group, a nitro group, a cyano group, an aryl group with or without substitution, or a heterocyclic group with or without substitution; and each of R.sup.5 and R.sup.6 is a cyano group or an alkoxycarbonyl group.

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Nagano, Japan

Motohiro Takeshima