| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a speaker device with a simple structure capable of solving various problems caused by air sucked and exhausted at a bass reflex port. Ž<P>SOLUTION: The bass reflex port 10 comprises a main pipe part 100 and air rectifiers 101, 102 installed at opposite ends of the main pipe part. The main pipe part 100 has a circular pipe shape having a predetermined circular hollow cross section with an inner diameter and length that excites Helmholtz resonance at a desired frequency. The air rectifiers 101, 102 has a shape where a hollow cross sectional area gradually becomes large from the side connecting to the main pipe part 100 toward opposite side thereto. Here, in the air rectifiers 101, 102 a gap of a pair of wall surfaces of two pairs wall surface groups facing each other is formed to be constant and the other pair of wall surfaces is formed such that the hollow cross section monotonically increases in the form of an exponential function. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
|
