| 摘要 |
PROBLEM TO BE SOLVED: To vary a transmission circuit structure, to perform reliable signal transmission and to reduce radiation noise by preparing plural kinds of transmission circuit structures of signal transmission examples of a cable signal transmission line. SOLUTION: When this device is suitable for signal transmission between a PCB 10 for main control of a digital copier and an LD(laser diode) control PCB 20, the main control PCB 10 controls the LD control PCB 20, a scanner 30, an operating part 40, a high voltage controlling part 50, a paper carrier controlling part 60, etc. Also, the control PCB 20 modulates and controls an LD 70. Here, selectors (circuit selecting means) 12 and 21 switches filter circuits A to C which are provided on the side of the control PCB 10 and termination circuits A to C which are provided on the side of the control PCB 20 in response to a seleptor control signal from a CPU 11, and performs signal transmission in a different frequency between the control PCB 10 and the control PCB 20 and the control PCB 20 modulates and controls the LD 70 in a modulation frequency that corresponds to the pixel density of a horizontal scan. |
