Patent ID: 9469134
Filing Date: 2016-10-18
CPC Classification: B41J

Claim Text:
1. A ventilation device, comprising: a ventilation part that includes a first engagement part and that allows air to flow therethrough; and an air-feeding direction change part that includes a second engagement part, that is revolvably attached to the ventilation part by engaging the first engagement part and the second engagement part, and that changes an air-feeding direction in accordance with its revolving, wherein the ventilation part includes an attachment center, a plurality of aperture parts, and a plurality of cavity parts formed around the attachment center, the attachment center being for revolvably attaching the air-feeding direction change part, wherein the cavity parts have a bottom wall and a predetermined depth, the air-feeding direction change part includes an oblique member and a ventilation mouth part, the oblique member being disposed to incline with respect to a rotational axis of the air-feeding direction change part, and the ventilation mouth part communicating with the plurality of aperture parts under a state where the air-feeding direction change part is attached to the ventilation part, the plurality of aperture parts and the plurality of cavity parts of the ventilation part form a plurality of concentric polygons having a common center at the attachment center of the ventilation part at which the air-feeding direction change part is attached, a concentric polygon formed by the plurality of cavity parts having a size smaller than concentric polygons formed by the plurality of aperture parts, a number of the aperture parts forming a first polygon at a farther distance from the center of the polygons is greater than a number of the aperture parts forming a second polygon at a closer distance from the center of the polygons, and the number of aperture parts forming a respective one of the plurality of concentric polygons are separated from the number of aperture parts forming other ones of the plurality of concentric polygons.