IMAGE FORMING APPARATUS AND SAFETY CIRCUIT MOUNTED ON THE SAME APPARATUS

摘要

The image forming apparatus of the present invention includes a fixing unit of including a heater and fixing a toner image formed on a recording material onto this recording material, the heater including a first heat generating member and a second heat-generating member, a first driving element provided on a power supply path to the first heat-generating member; a second driving element provided on a power supply path to the second heat generating member, a control unit controlling the first driving element and the second driving element respectively, first detection unit for detecting current flowing through the first heat-generating member, a second detection unit of detecting current flowing through the second heat-generating member, and a safety circuit receiving a first output of the first detection unit and a second output of the second detection unit.

主权项

1. An image forming apparatus, comprising:
a fixing unit adapted to fix a toner image formed on a recording material onto the recording material, the fixing unit including a heater including a substrate, and a first heat generating member and a second heat-generating member that are provided on the substrate, and heating the toner image; a first driving element provided on power supply path to the first heat-generating member; a second driving element provided on a power supply path to the second heat-generating member; a control unit controlling the first driving element and the second driving element respectively; a first detection unit for detecting current flowing through the first heat-generating member; a second detection unit of detecting current flowing through the second heat-generating member; and a safety circuit receiving output the first detection unit and a second output of the second detection unit, safety circuit outputting a cut-off signal for stopping supplying power to at least one of the first heat-generating member and the second heat-generating member when a difference between a value according to the first output and a value according to the second output exceeds a predetermined threshold.