Abstract: An organic transistor includes an insulating substrate, a gate electrode on the substrate, a gate insulating layer disposed over the substrate and the gate electrode, a source and a drain electrode on the gate insulating layer, a nonpolar macromolecular insulating underlayer disposed on the gate insulating layer at least between the source electrode and the drain electrode, and an organic semiconductor layer disposed on the source electrode and the drain electrode and on the insulating underlayer between the source electrode and the drain electrode.

Abstract: An ink jet printer includes a liquid ejection head that forms an image on a roll paper which is transported from upstream to downstream of a transportation path, and a cutter unit that cuts the roll paper on which the image is formed by the liquid ejection head straight in the direction transverse to the transportation direction of the roll paper, wherein the cutter unit is configured to be capable of changing the cutting direction of the roll paper.