| 摘要 |
PROBLEM TO BE SOLVED: To prevent a primary electric discharge wire and a grid wire from being soiled in accordance with dust collection by electric discharge and to prevent a faulty image from being formed by providing a device with an image carrier and an electrification means uniformly electrifying the image carrier and making the current of the electrification means in the direction of the image carrier different between an image forming time and time other than the image forming time. SOLUTION: After a photoreceptor drum 1 is started to be rotated because a signal for starting an image forming action is inputted by a copying button and the like, the pre-exposure thereof is started first and the primary electrification thereof is started by the application of a grid voltage and the application of a primary discharge current (-300μA) by a primary electrifier 2. Thereafter, the primary discharge current is switched to -600μA and set so as to become the current in a prescribed direction of the drum 1 of the image forming time synchronously with a situation that the front end of an image forming part on the drum 1 arrives at a primary electrifying position, Then, a latent image for a yellow image is started to be formed synchronously with the situation that the front end arrives at a latent image forming position. Besides, a developing unit 4 m is started to be actuated synchronously with the situation that the front end arrives at the unit 4 m.
|
