Patent ID: 8723903

Claim:
A light emitting element head having a drive device for driving a plurality of light emitting elements, the drive device comprising: a semiconductor substrate having a longitudinal shape; data input terminals for inputting turning on and off information for turning the plurality of light emitting elements on and off; a power terminal for connecting to a power supply; a clock terminal for inputting a clock signal for transmitting sequentially the turning on and off information; a plurality of drive control circuits arranged on the semiconductor substrate, the plurality of drive control circuits including a plurality of drive circuits for driving the plurality of light emitting elements; and a plurality of circuit sections, the plurality of circuit sections including a plurality of writing control circuits for outputting a writing command; wherein the data input terminals, the power terminal, and the clock terminal are arranged at an edge portion side of the semiconductor substrate, and the plurality of drive control circuits are arranged substantially in line with the plurality of circuit sections along a longitudinal direction of the substrate.