| 摘要 |
PURPOSE:To carry out exposing/illuminating at a constant light quantity ratio without having irregularities in illumination, when an auxiliary lamp is added. CONSTITUTION:In an image forming device having a flush lamp 7 exposing an original on a contact glass a one-way direction, the auxiliary flush lamps 30a and 30b auxiliarily exposing the original from the other direction different from luminous flux by the main flush lamp 7, the light quantity of a flush lamp and the applying voltage of a lamp are approximate with a primary curve, so that a point that the light quantity of the lamp is controlled, as well, by controlling the applying voltage of the lamp is observed. Thus, the ratio of voltages applied to the main flush lamp 7 and to the auxiliary flush lamps 30a and 30b is kept constant to be varied. |
