Charging device, process cartridge, image forming apparatus, and toner

An image forming apparatus comprising:

• an image bearing member;
• a developing device;
• a cleaning device;
• and
• a charging device including a charging roller and a cleaning roller that is configured to make contact with a surface of the charging roller;
• wherein the cleaning roller includes a core body and a melamine resin foam that is configured to be provided on a peripheral surface of the core body and make contact with at least the surface of the target member;
• wherein the melamine resin foam is formed into a roller configuration;
• and
• wherein the cleaning roller is obtained after the melamine foam is compressed from an original shape in a radial direction of the cleaning roller so as to have a tensile strength of the melamine resin foam in a range of 1.7±0.5 kg/cm2.

A cleaning roller that is configured to make contact with a surface of a target member to be cleaned, the cleaning roller comprising:

• a core body;
• a melamine resin foam that is configured to be provided on a peripheral surface of the core body and make contact with at least the surface of the target member;
• wherein the melamine resin foam is formed into a roller configuration;
• wherein the cleaning roller is obtained after the melamine foam is compressed with heating from an original shape in a radial direction of the cleaning roller so as to have a compressibility of 30±15%.