| 摘要 |
PURPOSE: A ventilator is provided to prevent dust production due to the abrasion of a component by adjusting the air flowing level of an opening. CONSTITUTION: A ventilator(61) comprises an opening and a sheet(66). One end of the sheet is fixed to the opening or the neighborhood of the opening, the central part of the sheet moves to the direction of covering the opening by moving the other end and The other end of the sheet moves to the direction in which the middle portion of the sheet covers opening and the sheet is adhered to the opening by the pressure of gas passing the opening. The effective opening area of the opening is changed by the size of the adsorption area of the sheet covering the opening. The sheet is pressurized to the direction of covering the opening. The press force includes gravity.
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