| 摘要 |
PURPOSE:To provide a copying machine provided with a liquid crystal display part using a cold cathode tube whose brightness is secured even at low temperature as a light source. CONSTITUTION:The control part of a CCFT is provided with a microcomputer 11, a CCFT lighting circuit 12, and a fixing thermistor 10. Temperature signal output from the thermistor 10 is connected to the input of the microcomputer 11, and control output from the microcomputer 11 is inputted in the circuit 12. The CCFT 13 is connected to the circuit 12, and the circuit 12 controls impressed voltage on the CCFT 13 in accordance with the control signal from the microcomputer 11. |
