| 摘要 |
PROBLEM TO BE SOLVED: To provide an air passage switching device for reducing noise generated when a film opening end formed on a film member enters a case sealing rib by measuring a change in sound pressure of a sliding noise and finding out a timing when a sound pressure peak is generated, to reduce the sliding noise generated when a rotary door is rotated. SOLUTION: A guide plane section 16 is provided on an end of the case sealing rib 14. The guide plane section 16 has a tilted surface allowing the film opening end 15a to smoothly enter inside (rotary door 3 side) when the film member 4 is rotated. The film opening end 15a enters at an angle of 45°or less. As a result, the sound pressure peak generated when the film opening end 15a is crushed into the case sealing rib 14 can be reduced. COPYRIGHT: (C)2004,JPO
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