Patent ID: 8540343
Filing Date: 2013-09-24
Classification: B41J

Abstract:
1. An image forming apparatus comprising: a liquid ejection head having an ejection surface in which a plurality of nozzles that eject liquid droplets are arranged two-dimensionally; a conveyance device which conveys a recording medium on which the liquid droplets ejected from the plurality of nozzles of the liquid ejection head are deposited; a main body frame which supports the conveyance device; a head movement device which supports the liquid ejection head movably with respect to the main body frame; and a head fixing device which fixes the movable liquid ejection head to the main body frame at a position for droplet ejection onto the recording medium, wherein: the head fixing device has a pressure application device for head fixing which impels the liquid ejection head in a width direction of the recording medium which is perpendicular to a conveyance direction in which the conveyance device conveys the recording medium, and wherein a spring constant of the pressure application device for head fixing and a mass of the liquid ejection head are set so that a resonance (f where f wherein the resonance frequency (f where OSy is the spatial distance, fv is the relative vibration frequency, and vp is the conveyance speed.