| 摘要 |
<p>The invention provides a blank exposing device and an image forming apparatus which can prevent occurrence of a black stripe at the front end portion of a recording paper. The blank exposing device, which exposes the surface of a photosensitive object to light and thereby removes electric charge on the surface of it and forms a non-image area on the photosensitive object, comprises a blank exposing lamp formed by arranging a number of light emitting diodes 31, a constant-voltage power supply circuit 35 for applying a constant voltage to each light emitting diode 31, and a switching element 36 for performing an on-off operation of a voltage to be applied to each light emitting diode 31. A control portion 110 controls the switching element 36 to generate a pulse voltage of one or plural pulses and apply the pulse voltage to the blank exposing lamp when changing over the blank exposing lamp from the on state to the off state. Due to this, it is possible to gradually change the quantity of light of the blank exposing lamp when changing over it from the on state to the off state. <IMAGE></p> |
