Patent ID: 8033662
Filing Date: 2011-10-11
Classification: B41J

Abstract:
1. An image forming apparatus comprising: a head which has a liquid ejection surface and performs liquid ejection in which liquid is ejected from the liquid ejection surface; an intermediate transfer body moving in a movement direction with respect to the head and having an image forming surface that opposes the liquid ejection surface of the head and has an image forming region in which an image is formed by the liquid ejected from the liquid ejection surface of the head, and a rear surface which is reverse to the image forming surface and on which a line pattern constituted by pattern elements arranged equidistantly in the movement direction is formed; a transfer device which transfers the image formed in the image forming region of the intermediate transfer body to a recording medium; a reading device which is provided on an upstream side of the head in terms of the movement direction of the intermediate transfer body and reads light reflected by the line pattern; and an ejection control device which determines a movement speed and a movement distance of the intermediate transfer body from result obtained by reading the light by means of the reading device, generates an ejection control signal for the head according to the determined movement speed and the determined movement distance of the intermediate transfer body, and controls the liquid ejection of the head according to the ejection control signal, wherein: a plurality of the heads are provided; a plurality of the reading devices are provided in such a manner that n reading devices (where n is an integer not less than 2) are provided with respect to each of the plurality of the heads, the n reading devices being arranged in the movement direction of the intermediate transfer body at an arrangement interval of 1/n of an arrangement interval of the pattern elements of the line pattern.