Patent ID: 8632156

Claim:
A paper floating detection apparatus arranged at a conveyance path of a conveyance device which holds paper on a conveyance surface and conveys the paper through the conveyance path in a conveyance direction while causing a surface of the paper to face a droplet ejection head, the apparatus comprising: a light emission unit and a light reception unit which are arranged to face each other across the conveyance path, the light emission unit and the light reception unit being disposed in such a manner that an optical path of detection light emitted from the light emission unit and received by the light reception unit is substantially perpendicular to the conveyance direction, floating up of the paper from the conveyance surface being detected by detecting that the conveyed paper has shielded the detection light; an air flow diverting guide member which is arranged in a periphery of the optical path and configured to prevent inflow of air having a temperature differential sufficient to affect the optical path; and an air blowing device which blows air having substantially no temperature differential with respect to air in the periphery of the optical path, toward a space between the air flow diverting guide member and the conveyance surface.