| 摘要 |
<p>PURPOSE:To precisely correct light quantity for each dot and to eliminate the unevenness of gradation on a printed surface by using an LED element with a specified light quantity, setting the light emitting time of each element by means of a switching circuit and controlling an energizing time by mans of a control circuit. CONSTITUTION:The exposing device 1 of the title device is constituted of an LED array head and the LED element having the light quantity with which the surface potential of a photosensitive body is sufficiently lowered is used. The title device is provided with the switching circuit 5 which sets the light emitting time of the above-mentioned element and an energizing time control circuit 6 which controls the energizing time by a driving circuit 2 based on an output from the circuit 5. The light emitting time of all the LED elements is set with the operation of the circuit 5 and a set value is set to be optimum density from image density after printing. Thus, printing without unevenness of gradation is performed.</p> |
