Developing device with a developing roller and using a single-component developer and method for producing such developing roller

A method for producing a resilient support layer for a developing roller of a developing device, said developing roller comprising at least said support layer and a dielectric layer provided thereon, said developing device being adapted to develop an electrostatic latent image formed on a photoconductive drum through said developing roller by using a single-component developer which is constituted by toner, said method comprising steps of:

• (a) determining a contact width H.sub.0 of said photoconductive drum and said developing roller from an equation (eq. 2);
• (b) determining a time Td from an equation (eq. 13) using said contact width H.sub.0 ;
• (c. 1) determining an amount M(.infin.) of toner deposition on said photoconductive drum under a saturated condition from an equation (eq. 21);
• (c. 2) determining an amount M(Td) of toner deposition on said photoconductive drum occurring when a time t=Td, from an equation (eq. 22);
• and
• (c. 3) while adjusting a resistance R of a resistance component provided in parallel with a capacitor component CR.sub.2 of said support layer such that the following condition is satisfied:
• ##EQU16##