To provide a highly reliable inverter apparatus which discriminates long-cycle noise generated by the isolated signal transmission element from short-cycle dvdt noise and induction noise. The semiconductor chip comprises a single crystal semiconductor substrate and a Group III-V compound semiconductor layer. Thereto, the transistor is provided in a top-gate structure, and the organic semiconductor layer and the dielectric layer are structure and patterned together. The optical data link carries image data signals from second electronic circuitry remote from the carriage. with hydrogen pressure between 1-13 MPa.