| 摘要 |
PROBLEM TO BE SOLVED: To form a high-quality color image by reading a patch line and a toner mark line for process control by the use of the same detection means, fetching the frequency component of a detection signal without deteriorating it and preventing the influence of noise from being exerted. SOLUTION: This color image forming device is composed of a detection sensor element 14 or 15 reading the patch line and the toner mark line for the process control, an LPF(low-pass filter) constituted of resistances 22 and 24 removing a high frequency signal such as the noise from the detection signal from the detection sensor element and capacitors 24 and 25, and an OP amplifier 26 amplifying and outputting a voltage signal outputted from the LPF. |
