Patent ID: 9227405
Filing Date: 2016-01-05
CPC Classification: B41J

Claim Text:
1. An inkjet recording apparatus comprising: a conveyor belt having a placement face on which a recording medium is placed and conveyed, the conveyor belt configured to cause the placement face to move in a conveyance direction of conveying the recording medium; a suction unit that is disposed below the placement face of the conveyor belt configured to apply a suction force exerted by a downward airflow to the recording medium placed on the placement face, such that the recording medium is sucked onto the placement face; a plurality of linear recording heads arranged in the conveyance direction, which is disposed upward opposite to the suction unit across the conveyor belt, has a nozzle face on which an ink ejection nozzle is formed and extends in an orthogonal direction orthogonal to the conveyance direction; and a head frame shaped like a plate, to which the plurality of linear recording heads is attached, having a plurality of ventilation openings penetrating in a thickness direction at a portion like a plate except for where the plurality of linear recording heads is attached, wherein a total aperture area S of the plurality of ventilation openings is set to satisfy: 2 (W+L) H<<S, where W represents a width of the head frame in the orthogonal direction, L represents a length of the head frame in the conveyance direction and H represents a gap between the head frame and the placement face of the conveyor belt, respectively, wherein a velocity V of a horizontal wind generated in a gap between the head frame and the placement face of the conveyer belt is approximated by a relation of V≈U/S, where U represents a flow rate of a downward airflow generated by the suction unit, wherein the total aperture area S is configured to allow the velocity V to be no greater than 5 m/sec with respect to the given flow rate U, and wherein when one end of the head frame is normalized as 1 and the other end of the head frame is normalized as −1 in the conveyance direction, the plurality of ventilation openings constituting the total aperture area S lie exclusively within a range between no less than −0.8 and no greater than −0.2; or within a range between no less than +0.2 and no greater than +0.8.