ELECTROPHOTOGRAPHIC PHOTOSENSIVE ELEMENT AND IMAGE FORMING DEVICE PROVIDED WITH IT

摘要

An electrophotographic photosensitive element being excellent in cleaning performance, free from image deterioration of a formed image even after an extended use, and capable of forming a high-sensitivity, high-resolution, high-quality image. A photosensitive layer (6) provided on a conductive substrate (2) of the electrophotographic photosensitive element (1) contains a crystal-type oxotitanium-phthalocyanine showing a diffraction peak at at least 27.3˚ at a Bragg angle of 2theta in X-ray diffraction spectrum, and has its surface free energy (gamma) on the surface thereof set to 20-35 mN/m. Such an inclusion of a specific crystal-type oxotitanium-phthalocyanine enables the formation of an image excellent in sensitivity and resolution and the control of a foreign matter depositing force when gamma is set to an appropriate range, thus delivering a good cleaning performance.