| 摘要 |
PURPOSE:To obtain the electrifying device which enhances image quality and decreases noises by setting in such a manner that the ratio between the outside diameter of an electrifying member and the outside diameter of a body to be electrified is smaller than 2 and the outside diameter of the electrifying member does not exceeds the outside diameter of the body to be electrified. CONSTITUTION:The ratio Dd/Dc between the outside diameter Dc of the electrifying member 2 and the outside diameter D of the body 1 to be electrified of the electrifying device having the electrifying member 2 making contact with the body 1 to be electrified in order to electrify the body 1 to be electrified is so set that this ratio is smaller than 2 and Dc does not exceed Dc. The vibrating sounds generated by the impression of an AC voltage is empirically elucidated to be decreased by lowering the ratio Dd/Dc between the outside diameter of the electrifying member 2 which strikes the body to be electrified and the outside diameter of the struck body to be electrified. The Dd/Dc is satisfactory with the value smaller than 2 and is more preferably <=1.5. The effect of decreasing the vibrating sounds is not enough at >=2. While the effect of decreasing the vibrating sounds is remarkable if the Dc exceeds the Dd, the unnecessary large value thereof is undesirable as the electrifying device. |
