Charging member with resin-based surface layer containing conductive inorganic particles

1 . A charging member comprising:

a support member, an elastic layer provided on the support member, and a surface layer provided on the elastic layer,

wherein the surface layer contains a resin, conductive particles, and non-conductive inorganic particles; and

the surface layer contains 5 parts by mass or more and 40 parts by mass or less of the non-conductive inorganic particles relative to 100 parts by mass of the resin.

2 . The charging member according to claim 1 , wherein the thermal conductivity of the non-conductive inorganic particles is 40 W/(m·k) or more.

3 . A charging device comprising the charging member according to claim 2 .

4 . A process cartridge comprising a photoreceptor, and a charging device that includes the charging member according to claim 2 and charges the surface of the photoreceptor, the process cartridge being detachable from an image forming apparatus.

5 . An image forming apparatus comprising:

a photoreceptor;

a charging device that includes the charging member according to claim 2 and charges the surface of the photoreceptor;

an electrostatic latent image forming device that forms an electrostatic latent image on the charged surface of the photoreceptor;

a developing device that develops the electrostatic latent image formed on the surface of the photoreceptor with a developer containing a toner to form a toner image; and

a transfer device that transfers the toner image to the surface of a recording medium.

6 . The charging member according to claim 1 , wherein the non-conductive inorganic particles contain at least one type selected from the group consisting of nitride particles, oxide particles, carbide particles, and boride particles.

7 . A charging device comprising the charging member according to claim 6 .

8 . A process cartridge comprising a photoreceptor, and a charging device that includes the charging member according to claim 6 and charges the surface of the photoreceptor, the process cartridge being detachable from an image forming apparatus.

9 . An image forming apparatus comprising:

a photoreceptor;

a charging device that includes the charging member according to claim 3 and charges the surface of the photoreceptor;

an electrostatic latent image forming device that forms an electrostatic latent image on the charged surface of the photoreceptor;

a developing device that develops the electrostatic latent image formed on the surface of the photoreceptor with a developer containing a toner to form a toner image; and

a transfer device that transfers the toner image to the surface of a recording medium.

10 . The charging member according to claim 1 , wherein the non-conductive inorganic particles contain at least one type selected from the group consisting of aluminum nitride particles, boron nitride particles, and magnesium oxide particles.

11 . A charging device comprising the charging member according to claim 10 .

12 . A process cartridge comprising a photoreceptor, and a charging device that includes the charging member according to claim 10 and charges the surface of the photoreceptor, the process cartridge being detachable from an image forming apparatus.

13 . An image forming apparatus comprising:

a photoreceptor;

a charging device that includes the charging member according to claim 10 and charges the surface of the photoreceptor;

an electrostatic latent image forming device that forms an electrostatic latent image on the charged surface of the photoreceptor;

a developing device that develops the electrostatic latent image formed on the surface of the photoreceptor with a developer containing a toner to form a toner image; and

a transfer device that transfers the toner image to the surface of a recording medium.

14 . The charging member according to claim 1 , wherein the average primary particle diameter of the non-conductive inorganic particles is 5 μm or more and 20 μm or less.

15 . A charging device comprising the charging member according to claim 6 .

16 . A process cartridge comprising a photoreceptor, and a charging device that includes the charging member according to claim 14 and charges the surface of the photoreceptor, the process cartridge being detachable from an image forming apparatus.

17 . An image forming apparatus comprising:

a photoreceptor;

a charging device that includes the charging member according to claim 10 and charges the surface of the photoreceptor;

an electrostatic latent image forming device that forms an electrostatic latent image on the charged surface of the photoreceptor;

a developing device that develops the electrostatic latent image formed on the surface of the photoreceptor with a developer containing a toner to form a toner image; and

a transfer device that transfers the toner image to the surface of a recording medium.

18 . A charging device comprising the charging member according to claim 1 .

19 . A process cartridge comprising a photoreceptor, and a charging device that includes the charging member according to claim 1 and charges the surface of the photoreceptor, the process cartridge being detachable from an image forming apparatus.

20 . An image forming apparatus comprising:

a photoreceptor;

a charging device that includes the charging member according to claim 1 and charges the surface of the photoreceptor;

an electrostatic latent image forming device that forms an electrostatic latent image on the charged surface of the photoreceptor;

a developing device that develops the electrostatic latent image formed on the surface of the photoreceptor with a developer containing a toner to form a toner image; and

a transfer device that transfers the toner image to the surface of a recording medium.