Contact-type charging device having a plurality of projections over the surface of the charging device

A charging apparatus comprising:

• a charging member for being supplied with a voltage to charge a member to be charged, the charging member including an elastic member contacting with the member to be charged and a plurality of projections provided at a surface of the elastic member and which are inclined relative to a normal line of a surface of said charging member;
• and
• supplying means for supplying electroconductive particles so that particles are provided in a contacting portion between the member to be charged and said charging member,
• wherein said charging member carries the electroconductive particles,
• wherein a speed A of a surface of said charging member and a speed of a surface of the member to be charged satisfy:
• B−A>0
• wherein the plurality of projections are inclined downstream with respect to a movement direction of the surface of the member to be charged.

A charging apparatus comprising:

• a charging member for being supplied with a voltage to charge a member to be charged, the charging member including an elastic member contacting with the member to be charged and a plurality of projections which are provided at a surface of the elastic member and which are inclined relative to a normal line of a surface of said charging member;
• and
• supplying means for supplying electroconductive particles so that particles are provided in a contacting portion between the member to be charged and said charging member;
• wherein the plurality of projections have a diameter of 5-10 microns, a length of 5-200 microns, and a density of the projections is 10-200/mm,
• wherein a speed A of a surface of said charging member and a speed B of a surface of the member to be charged satisfy:
• B−A>0
• wherein the plurality of projections are inclined upstream with respect to a movement direction of the surface of the member to be charged.

A charging apparatus comprising:

• a charging member for being supplied with a voltage to charge a member to be charged, the charging member including an elastic member contacting with the member to be charged and a plurality of projections provided at a surface of the elastic member and which are inclined relative to a normal line of a surface of said charging member;
• and
• supplying means for supplying electroconductive particles so that particles are provided in a contacting portion between the member to be charged and said charging member,
• wherein the plurality of projections have a diameter of 5-10 microns, a length of 5-200 microns, and a density of the projections is 10-200/mm,
• wherein a speed A of a surface of said charging member and a speed B of a surface of the member to be charged satisfy:
• B−A<0
• wherein the plurality of projections are inclined downstream with respect to a movement direction of the surface of the member to be charged.

A charging apparatus comprising:

• a charging member for being supplied with a voltage to charge a member to be charged, the charging member including an elastic member contacting with the member to be charged and a plurality of projections which are provided at a surface of the elastic member and which are inclined relative to a normal line of a surface of said charging member,
• wherein said charging member carries electroconductive particles, and particle sizes of the electroconductive particles not more than 50 μm,
• wherein a speed A of a surface of said charging member and a speed B of a surface of the member to be charged satisfy:
• B−A>0
• wherein the plurality of projections are inclined upstream with respect to a movement direction of the surface of the member to be charged.

A charging apparatus comprising:

• a charging member for being supplied with a voltage to charge a member to be charged, the charging member including an elastic member contacting with the member to be charged and a plurality of projections provided at a surface of the elastic member and which are inclined relative to a normal line of a surface of said charging member;
• wherein said charging member carries electroconductive particles, and particle sizes of the electroconductive particles are not more than 50 μm,
• wherein a speed A of a surface of said charging member and a speed B of a surface of the member to be charged satisfy:
• B−A<0
• wherein the plurality of projections are inclined downstream with respect to a movement direction of the surface of the member to be charged.