| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide the back panel module structure provided with a fan noise reducing mechanism which can drastically improve noise attenuation effect with compact, space-saving constituting while maintaining an efficient air-cooling function as a structure which attenuates the noise of the air-cooling fan. SOLUTION: The resonance frequency range of a air-discharge side resonance chamber 26 is varied by shifting the position of a top plate 25 within the long- diameter range of a long hole (h) bored in a main body 10, so the noise in specific frequency ranges that airdischarging fans 19... generate can efficiently be attenuated without reducing the air capacity and air speed of the airdischarging fans 19....</p> |
