| 摘要 |
<p>Provided is an electronic device wherein sound waves leaking out to the outside from a communicating hole of a casing are attenuated and sound wave leakage is suppressed. The electronic device has, inside a casing (1), a sound wave generating source (5) which generates sound waves at a predetermined frequency, and on the casing (1), a communicating hole (6) by which the inside and the outside of the casing are communicated with each other. A notch filter (7) attenuating the sound waves which are at the predetermined frequency and pass through the communicating hole is arranged on the outside or inside the casing portion where the communicating hole is arranged. The notch filter (7) is provided with a filter main body (70) which covers the communicating hole (6). A through hole (72) and a sound attenuating space (71) are formed on the filter main body. The through hole (72) is formed at a position facing the communicating hole. In the sound attenuating space (71), the inner circumferential side is connected to the communicating holes (6, 72), the outer circumferential side extends in the radius direction and an end wall (71a) that reflects sound waves is formed on the outer circumferential end.</p> |
