Patent ID: 8759766

Claim:
An air supply tube provided with an inlet port that takes in air; and an outlet port that is arranged opposite a portion of an elongated target structure in a longitudinal direction, to which air taken in from the inlet port is to be supplied, and has an elongated opening shape in parallel to the portion of the target structure in the longitudinal direction and different from the inlet port; the air supply tube comprising: a channel portion in which a channel space for allowing air to flow between the inlet port and the outlet port is formed; and a plurality of suppressing portions that are provided in different parts in an air flow direction in the channel space of the channel portion and suppress the flow of air, wherein the plurality of suppressing portions include at least a most downstream suppressing portion that is provided in a most downstream-side part in the air flow direction of the channel portion and is a permeable member having a plurality of ventilation portions, a first upstream suppressing portion that is provided in a part initially located on the upstream side in the air flow direction relative to the most downstream suppressing portion in the channel portion, and is configured such that a portion of a channel space in the corresponding part is blocked along a direction parallel to the longitudinal direction of the outlet port and a gap in a shape extending in the direction parallel to the longitudinal direction of the outlet port is provided to allow air to pass therethrough, a gap regulating portion that forms an extended gap at the same interval as the gap extended and connected in a state of being bent in a direction away from the most downstream suppressing portion from the gap of the first upstream suppressing portion is provided in a part between the most downstream suppressing portion and the first upstream suppressing portion in the channel portion, and the first upstream suppressing portion extends from a first wall of the channel portion in a first direction, and the gap regulating portion extends from a second wall of the channel portion opposite to the first wall in a second direction opposite to the first direction.