Konishiroku Photo Industry Co., Ltd.

Konica Corporation

Yasuo Suzuki

Yoshihide Fujimaki

Hiroyuki Nomori

Yoshiaki Takei

Akira Hirano

Masataka Takimoto

Photoreceptor having a metal-free phthalocyanine charge generating layer

Disclosed is a photoreceptor for electrophotography comprising a carrier generation layer and a charge transport layer. The organic charge generating substance has, at the time of positive charging, a photosensitivity less than the photosensitivity at the time of negative charging.

Photoreceptor for positive electrostatic charge

Disclosed is a photoreceptor for electrophotography comprised of a charge carrier generating material and charge transport material wherein one charge generating material is a metal phthalocyanine or a metal-free phthalocyanine. The layer containing the generator material also contains an organic amine.

Photoreceptor for electrophotography comprising a phthalocyanine and

A photoreceptor for positive charging is disclosed, said photoreceptor comprising a carrier generating material which is stable against both heat and light, has high carrier generating efficiency and provides good photoconductivity over a wide wavelength range and a specific carrier transport material combined in such a manner that the shape of surface potential curves remains essentially constant over a cyclic operation and contributes to the formation of a visible image of high quality in each cycle by reducing the 'memory effect', minimizing the residual potential and extending the cycle life.

Positive charging photorecptor

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Hachioji, Japan

Yasuo Suzuki