| 摘要 |
An image to be formed on paper ( 26 ) is held on the surface of photo-sensitive drum ( 1 ). This is a latent image of static electricity formed by an LED exposer ( 5 ). Then, the developing roller ( 7 ) puts toner on the surface of photo sensitive drum ( 1 ), so as to develop a toner image. Meanwhile, the toner conveying roller ( 9 ) supplies toner to the developing roller ( 7 ). In this occasion, the printer controller ( 17 ) calculates the image density of image data ( 18 ) with dot counter ( 13 ). And, it decides the first voltage impressed to developing roller ( 7 ) by developing bias source ( 8 ) as well as the second voltage impressed to toner conveying roller ( 9 ) by stretching bias source ( 10 ) according to the image density of original image.
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