FIELD

Embodiments described herein relate generally to a driving apparatus and an image forming apparatus.

BACKGROUND

A tandem electrophotographic image forming apparatus forms a color image by causing element images of respective different colors formed by a plurality of image forming units to overlap each other. Therefore, the plurality of image forming units simultaneously execute an operation for forming the element images.

Each of the plurality of image forming units includes an exposure head configured by arranging a large number of light emitting elements such as an organic light emitting diode (OLED) over a length corresponding to one line. That is, the exposure head can perform exposure for one line by driving once. The exposure head is repeatedly driven the same number of times as the number of lines of one page, such that the exposure for one page is performed.

A timing of starting and ending the driving of the exposure head is determined in synchronization with a control clock. In a related art, the same control clock is used for driving a plurality of exposure heads. Therefore, light emission start timings of the plurality of exposure heads coincide with each other, radiation noise increases, and it may be required to strengthen an electromagnetic interface (EMI) countermeasure.

Under the above-described circumstances, it is desired to reduce the radiation noise related to driving of the exposure head.

