| 摘要 |
An air passage opening/closing system includes a case having a casing opening portion, and a film door having a plurality of door opening portions. The case has a thin portion extending from a peripheral portion of the casing opening portion in a moving direction of the film door. In the system, a distance between the peripheral portion of the casing opening portion and the film door is not smaller than 5 mm, the case has a thick portion connected to the thin portion, and the thick portion contacts the film door to have a predetermined friction therebetween during moving the film door. Therefore, air flowing from a door opening portion collides with an inner surface of the thin portion of the case so that a flow rate of air is reduced, and then expands in a space between the thin portion of the case and the film door so that the flow rate of air is further reduced. Thus, it can prevent a whistle noise from being caused when the casing opening portion starts opening, while keeping an excellent airtightness of the system when the casing opening portion is fully closed.
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