| 摘要 |
PROBLEM TO BE SOLVED: To obtain a highly sensitive photoreceptor which exhibits high quality image and which can be used for a long period of time with little potential change by incorporating hydroxygallium-phthalocyanine and a particular disazo pigment into a photosensitive layer. SOLUTION: In an electrophotographic photoreceptor having a photosensitive layer on an electroconductive support, the photosensitive layer contains hydroxygallium-phthalocyanine and a disazo pigment expressed by the formula, wherein A1 and A2 are the same or different and are each a coupler residue having phenolic hydroxyl groups; B is H, an alkyl group which may be substituted, an aryl group which may be substituted or a heterocyclic group which may be substituted; (m) and (n) are each 0 or 1. A process cartridge supports one means selected from the electrophotographic photoreceptor, electrifying means, developing means and cleaning means, in the united form, and is freely attached to or detached from a electrophotographic device main body.
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