Patent ID: 8474935

Claim:
An image forming apparatus comprising: a recording head having plural sub-heads, the sub-heads each including plural nozzles, each of the plural nozzles within a sub-head ejecting liquid droplets at the same time with respect to a medium on which an image is drawn, and the sub-heads being arranged in a substantial single line in a width direction of the medium; a setting unit that uses a timing when a predetermined sub-head of the plural sub-heads ejects liquid droplets as a reference to set timings when the other sub-heads which are arranged in a substantial single line with the predetermined sub-head eject liquid droplets; a rotation unit that uses a predetermined axis as a spindle to rotate and position the recording head in a plane parallel to a plane of the medium; a rotation amount derivation unit that derives a rotation amount on the basis of inclination, with respect to a direction corresponding to the width direction of the medium, of a regression line of all endpoints of straight lines that have been formed by the sub-heads; and a rotation controlling unit that controls the rotation unit such that the rotation unit rotates the recording head by the rotation amount that has been derived by the rotation amount derivation unit.