| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply circuit suitable for a low-priced thermally fixing device which enable the shortening of warm up time and quick start to be attained and can cope with electric power saving by using two electromagnetic induction heating coils of high heating efficiency. SOLUTION: A resonance condenser C1 is connected in parallel with either one among two heating coils M1 and M2 having different heat generation length which are disposed in a heating roller of an electromagnetic induction thermally fixing device incorporating a microcomputer P via a switch SW2, further connection is executed so that power source voltage V which is given by rectifying and smoothing a commercial power source AC by a rectifier circuit D is supplied via a switching element SW1 connected with an IC1 for driving and further the IC1 for driving and the switch SW2 are connected with the microcomputer P to constitute so that the power source voltage V is supplied to either one among the heating coil M1 and the heating coil M2 via the switch SW2 according to an output control signal S2 corresponding to a recording paper size change-over signal S1 inputted in the microcomputer P. |
