Patent ID: 7029810

Claim:
An electrophotographic image forming apparatus comprising: at least one image forming unit comprising: an electrophotographic photoreceptor comprising: an electroconductive substrate; a charge generation layer disposed over the electroconductive substrate; and a charge transport layer disposed over the charge generation layer, a charger for charging the electrophotographic photoreceptor; an irradiator for irradiating the electrophotographic photoreceptor to form an electrostatic latent image thereon; an image developer for developing the electrostatic latent image with a developer comprising a toner to form a toner image on the electrophotographic photoreceptor; and a transferer for transferring the toner image onto a transfer sheet while applying an electrical current of not less than 65 μA to the electrophotographic photoreceptor, wherein the charge generation layer comprises titanylphthalocyanine crystals having a CuKα 1.542 Å X-ray diffraction spectrum comprising plural diffraction peaks, wherein a maximum diffraction peak is observed at a Bragg (2θ) angle of 27.2°; main peaks are observed at 9.4°, 9.6° and 24.0°; and a minimum diffraction peak is observed at 7.3°; and no diffraction peak is observed at an angle greater than 7.3° and less than 9.4°, wherein said angles may vary by ±0.2° and the minimum interval where no peak is observed between required peaks at 7.3 and 9.4 is 2.0 degrees absolute or more.