| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce an EMI level upon transfer of an image data signal without deteriorating the S/N ratio upon transfer of the image data signal in optical writing. <P>SOLUTION: If the lower limit of an image data transfer clock signal is 12.5 MHz, a first clock generating unit 10 generates an image data transfer clock signal of a frequency of 15.1 MHz, a second clock generating unit 11 generates an image data transfer clock signal of a frequency of 15.2 MHz, a third clock generating unit 12 generates an image data transfer clock signal of a frequency of 15.3 MHz, and a fourth clock generating unit 13 generates an image data transfer clock signal of a frequency of 15.4 MHz. Thus, in the case up to an EMI measurement range of 1 GHz, the harmonic waves of the image data transfer clock signals output together with the image data signals to a first LED head unit 2 to a fourth LED head unit 5 are not overlapped. <P>COPYRIGHT: (C)2012,JPO&INPIT |
