Electrophotographic photoreceptor
AssigneeKonica Corporation
InventorsYoshihide Fujimaki, Hajime Tadokoro, Yasuhiro Oda, Hiroshi Yoshioka
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Abstract
An electrophotographic photoreceptor is disclosed. The photoreceptor contains in a light sensitive layer thereof a titanylphthalocyanine having specific crystalline characteristics as defined in the specification and a polycyclic quinone pigment or a bisazo pigment as defined in the specification. The photoreceptor has a high sensitivity over a broad wavelength region, especially near-infrared range. It is suitably used for a laser printer.
Claims6
An electrophotographic photoreceptor comprises a light-sensitive layer provided on a substrate, wherein the light-sensitive layer contains;
- a crystalline titanylphthalocyanine providing, in an X-ray diffraction spectrum with a CuK .alpha. ray (1.541.ANG.), characteristic peaks of Bragg angles (2.theta.) of 9.6.degree..+-.0.2.degree.) and 27.2.degree..+-.0.2.degree., and a peak intensity at 9.6.degree..+-.0.2.degree. is not less than 40% of that at 27.2.degree..+-.0.2.degree., and
- a polycyclic quinone pigment represented by a formula of Q.sub.1, Q.sub.2 or Q.sub.3, or an azo pigment represented by a formula BA. ##STR31## wherein X is a halogen atom, a nitro, cyano, acyl or carboxyl group, n is an integer of 0 to 4, and m is an integer of 0 to 6, ##STR32## wherein X.sub.1 and X.sub.2 independently are a hydrogen atom or a halogen atom, provided that X.sub.1 and X.sub.2 are not simultaneously a hydrogen atom;
- Ar is an aromatic hydrocarbon ring having a fluorinated hydrocarbon group or an aromatic heterocyclic group having a fluorinated hydrocarbon group;
- Z is a group of non-metal atoms necessary to complete a substituted or unsubstituted aromatic heterocyclic group.
Dependencies are inferred from the claim text.