Electrophotographic photoreceptor, process cartridge and image forming apparatus
View Patent ↗An electrophotographic photoreceptor includes a conductive support; a photosensitive layer; and a surface protective layer as an outermost layer of the electrophotographic photoreceptor, wherein the electrophotographic photoreceptor satisfies following formulas (a) and (b): 3.6≦( A+B )/ C ×100≦6 (a) B≦0.3 (b) wherein A (μm) represents a ten-point-averaged surface roughness R ZJIS94 of the conductive support, B (μm) represents a ten-point-averaged surface roughness R ZJIS94 of the surface protective layer, and C (%) represents a reflectivity of the surface protective layer against the conductive support.
1. An electrophotographic photoreceptor comprising:
a conductive support;
a photosensitive layer; and
a surface protective layer as an outermost layer of the electrophotographic photoreceptor,
wherein
the electrophotographic photoreceptor satsfies following formulas (a) and (b):
3.6≦( A+B ) /C× 100≦6 (a)
B≦0.3, (b)
wherein
A (μm) represents a ten-point-averaged surface roughness R ZJIS94 of the conductive support,
B (μm) represents a ten-point-averaged surface roughness R ZJIS94 of the surface protective layer, and
C (%) represents a reflectivity of the surface protective layer against the conductive support.
2. The electrophotographic photoreceptor according to claim 1 , futher comprising:
an intermediate layer between the conductive support and the photosensitive layer.
3. The electrophotographic photoreceptor according to claim 2 , wherein
the intermediate layer comprises particles dispersed therein.
4. The electrophotographic photoreceptor according to claim 3 , wherein
the particles are conductive particles.
5. The electrophotographic photoreceptor according to claim 4 , wherein
the conductive particles are made of zinc oxide.
6. The electrophotographic photoreceptor according to claim 1 , wherein
the surface protecitve layer comprises:
a phenol resin; and
a charge transporting substance having a reactive functional group.
7. The electrophotographic photoreceptor according to claim 6 , wherein
the surface protective layer futher comprises:
a leveling agent.
8. The electrophotographic photoreceptor according to claim 1 , wherein
the photosensitive layer comprises:
a charge generating layer; and
a charge transporting layer.
9. An electrophotographic process cartridge which is detachable from an image forming apparatus, the electrophotographic process cartridge comprising:
the electrophotographic photoreceptor according to claim 1 ; and
at least one unit selected from the group consisting of a charging unit, an exposing unit, a developing unit, a transferring unit, a fixing unit and a cleaning unit.
10. An image forming apparatus comprising:
an electrophotographic photoreceptor according to claim 1 ;
a charging unit that charges a surface of the electrophotographic photoreceptor;
an exposing unit that imagewise exposes the charged surface of the electrophotographic photoreceptor to form an electrostatic latent image;
a developing unit that feeds a toner to the surface of the electrophotographic photoreceptor and thus develops the electrostatic latent image to form a toner image; and
a transferring unit that transfers the developed toner image to a target.
11. The electrophotographic photoreceptor according to claim 1 , wherein C(%) represents a reflectivity of the surface protective layer against the conductive support, and falls within a range of 8.5≦C≦9.6.