Semiconductor device for driving heat generator

An image forming apparatus comprising a semiconductor device, said semiconductor device comprising:

• a plurality of transistors, wherein each transistor comprises:
• a first semiconductor region of a first conducting type, including a first main electrode region;
• a second semiconductor region of a second conduction type, including a channel region, said second semiconductor region being disposed in said first semiconductor region, and in contact therewith, said channel region being in contact with a portion of said first main electrode region;
• a second main electrode region of the first conducting type disposed in said second semiconductor region and in contact with said channel region, and connected to an electrothermal converter;
• a gate insulating film disposed on said channel region;
• a gate electrode disposed on said gate insulating film and in alignment with said channel region;
• said portion of said first main electrode region which contacts said channel region is a high-resistance region;
• and
• wherein said semiconductor device forms a thermal head.