Electrophotographic photoreceptor, process cartridge, and image forming apparatus
View Patent ↗An electrophotographic photoreceptor includes a conductive support, an undercoat layer that is provided on the conductive support and that has a thickness of from 15 μm to 40 μm and has light transmittance of 20% or less with respect to light having a wavelength of 450 nm when the thickness is at least 15 μm, a charge generation layer that is provided on the undercoat layer, and a charge transport layer that is provided on the charge generation layer and that has a thickness of from 15 μm to 40 μm and has light transmittance of 30% or less with respect to light having a wavelength of 450 nm when the thickness is at least 15 μm.
1. An electrophotographic photoreceptor comprising:
a conductive support;
an undercoat layer that is provided on the conductive support and that has a thickness of from 17 μm to 40 μm and has a light transmittance of 20% or less with respect to light having a wavelength of 450 nm;
a charge generation layer that is provided on the undercoat layer; and
a charge transport layer that is provided on the charge generation layer and that has a thickness of from 15 μm to 40 μm and has a light transmittance of 30% or less with respect to light having a wavelength of 450 nm,
wherein
the charge transport layer includes a charge transport material expressed by the following Formula 1:
where in the Formula 1,
R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 each independently represent a hydrogen atom, a halogen atom, an alkyl group having from 1 to 20 carbon atoms, an alkoxy group having from 1 to 20 carbon atoms, or a substituted or unsubstituted aryl group having from 6 to 30 carbon atoms,
two substituents adjacent to each other may be bonded to each other to form a hydrocarbon cyclic structure, and
n and m each independently represent 1 or 2, and
the undercoat layer includes a binder resin and an electron-accepting compound dispersed in the binder resin, the electron-accepting compound being expressed by the following Formula 2:
where in the Formula 2,
R 11 represents a hydrogen atom or an alkyl group, and
n1 represents an integer of 0 or 1.
2. The electrophotographic photoreceptor according to claim 1 , wherein the light transmittance of the undercoat layer with respect to light having a wavelength of 450 nm is from 5% to 15%.
3. The electrophotographic photoreceptor according to claim 1 , wherein the light transmittance of the undercoat layer with respect to light having a wavelength of 450 nm is from 10% to 15%.
4. The electrophotographic photoreceptor according to claim 1 , wherein the undercoat layer further contains a metal oxide, and a content of the electron-accepting compound is from 1 part by weight to 5 parts by weight with respect to 100 parts by weight of particles of the metal oxide.
5. The electrophotographic photoreceptor according to claim 1 , wherein the undercoat layer further contains a metal oxide, and a content of the electron-accepting compound is from 2 parts by weight to 4 parts by weight with respect to 100 parts by weight of particles of the metal oxide.
6. The electrophotographic photoreceptor according to claim 1 , wherein the light transmittance of the charge transport layer with respect to light having a wavelength of 450 nm is from 10% to 25%.
7. The electrophotographic photoreceptor according to claim 1 , wherein the light transmittance of the charge transport layer with respect to light having a wavelength of 450 nm is from 15% to 20%.
8. The electrophotographic photoreceptor according to claim 1 , wherein in the Formula 1, the alkyl group that is represented by R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 is selected from a methyl group, an ethyl group, a propyl group, a butyl group, an octyl group, an octadecyl group, an isopropyl group, and a t-butyl group.
9. The electrophotographic photoreceptor according to claim 1 , wherein in the Formula 1, R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 are selected from a hydrogen atom or a methyl group.
10. A process cartridge that is detachable from an image forming apparatus, the cartridge comprising:
at least the electrophotographic photoreceptor according to claim 1 .
11. An image forming apparatus comprising:
the electrophotographic photoreceptor according to claim 1 ;
a charging unit that charges a surface of the electrophotographic photoreceptor;
an electrostatic latent image forming unit that exposes the charged surface of the electrophotographic photoreceptor to form an electrostatic latent image;
a developing unit that develops the electrostatic latent image with a developer to form a toner image; and
a transfer unit that transfers the toner image onto a transfer medium from the electrophotographic photoreceptor.
12. The electrophotographic photoreceptor according to claim 1 , wherein the thickness of the undercoat layer is from 20 μm to 40 μm.