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1. US20090004585 - Electrophotographic photoreceptor and electrophotographic apparatus

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[ EN ]

Claims

1. An electrophotographic photoreceptor, comprising:
a conductive support member; and
a photosensitive layer placed on the conductive support member,
wherein the photosensitive layer includes a charge-generating agent and a charge-transfer agent,
wherein the charge-generating agent is oxytitanium phthalocyanine having a Bragg angle (2θ) giving a maximum peak at 27.2°±0.2° in the X-ray diffraction spectra using CuKα as a radiation source,
and wherein the charge-transfer agent includes at least one compound selected from the group consisting of compounds represented by the following formulae (A1a) to (A1d),

( MOL) ( CDX)
2. The electrophotographic photoreceptor according to claim 1,
wherein the photosensitive layer is formed by dissolving the charge-transfer agent in tetrahydrofuran, followed by evaporating the tetrahydrofuran, and
wherein the photosensitive layer includes the tetrahydrofuran.
3. The electrophotographic photoreceptor according to claim 1, wherein the oxytitanium phthalocyanine has diffraction peaks at 9.7°, 14.2°, 18.0°, 24.2°, and 27.2° of Bragg angle (2θ±0.2°).
4. The electrophotographic photoreceptor according to claim 1, wherein the photosensitive layer includes an aromatic amine-based antioxidant.
5. An electrophotographic apparatus having an electrophotographic photoreceptor, a charging device to charge the electrophotographic photoreceptor, an exposure device which exposes the charged electrophotographic photoreceptor to light so as to form a latent image on the surface of the electrophotographic photoreceptor, and a development device which causes toner to adhere to the latent image on the surface of the electrophotographic photoreceptor, the electrophotographic apparatus transfers the toner adhered on the electrophotographic photoreceptor to a printing medium,
the electrophotographic photoreceptor, comprising:
a conductive support member; and
a photosensitive layer arranged on the conductive support member,
wherein the photosensitive layer includes a charge-generating agent and a charge-transfer agent,
wherein the charge-generating agent is oxytitanium phthalocyanine having a Bragg angle (2θ) giving a maximum peak at 27.2°±0.2° in the X-ray diffraction spectra using CuKα as a radiation source,
and wherein the charge-transfer agent includes at least one compound selected from the group consisting of compounds represented by the following formulae (A1a) to (A1d),

( MOL) ( CDX)
6. The electrophotographic apparatus according to claim 5, wherein in the apparatus, when charging the electrophotographic photoreceptor, the formation of the latent image, the adhesion of the toner, and the transfer of the toner, are carried out and then, the succeeding charging without neutralizing the electrophotographic photoreceptor is carried out.
7. The electrophotographic apparatus according to claim 5, wherein the circumferential speed of the electrophotographic photoreceptor from the exposure position where the electrophotographic photoreceptor is exposed to light, to the development position that causes the toner to adhere to the latent image is at most 0.1 second.
8. The electrophotographic apparatus according to claim 5, wherein the charging device is a contact charging device which is directly in contact with the electrophotographic photoreceptor.