| 摘要 |
An engine unit for an image forming apparatus transfers a toner image without corona discharge by adjusting a quantity of light radiated from pre-transfer lamps (PTLs). In the engine unit, a charge roller forms a uniform charge on an organic photoconductive (OPC) drum, and an exposure unit exposes the OPC drum to a light beam to form an electrostatic latent image. The PTLs apply a predetermined intensity of light to a non-image area on the OPC drum to change a potential of the non-image area to a value similar to a potential of an image area on the OPC drum, by adjusting a resistance value of resistors connected to the PTLs, so as to prevent a toner from remaining at a border between the image area and the non-image area. A transfer roller transfers the toner attached to the OPC drum to a recording sheet.
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