Patent ID: 7371491
Filing Date: 2008-05-13
Classification: G03G

Abstract:
1. A photoreceptor, comprising: an eleetroconductive cylindrical metal substrate; a charge blocking layer located overlying and directly contacting the electroconductive cylindrical metal substrate, wherein the charge blocking layer includes a polyamide and has a thickness of less than 2.0 μm; a moiré preventing layer located overlying and directly contacting the charge blocking layer, wherein the moiré preventing layer includes titanium oxide and a thermosetting resin including an alkyd resin and a melamine resin, and wherein a volume ratio of the titanium oxide to the thermosetting resin is from 1/1 to 3/1 and a weight ratio of the alkyd resin to the melamine resin is from 5/5 to 8/2; and a photosensitive layer located overlying and directly contacting the moire preventing layer, wherein the photosensitive layer comprises a titanyl phthalocyanine crystal which has an average primary particle diameter not greater than 0.25 μm, and has a first X-ray diffraction spectrum such that a maximum peak is observed at a Bragg (2θ) angle of 27.2°±0.2°; a peak is observed at Bragg (2θ) angle of 9.4°±0.2°, 9.6±0.2° and 24.0±0.2°; a lowest angle peak is observed at an angle of 73°±0.2°; no peak is observed between the lowest angle peak and the 9.4° peak; and no peak is observed at a Bragg (2θ) angle of 26.3°±0.2°, when a Cu-Kα X-ray having a wavelength of 0.1542 nm (1.542 Å) is used.