| 摘要 |
PURPOSE:To arrange so that noise leaking from the air intake part may be reduced by installing an air intake bypass on a casing fixed on the magnetic circuit side and reducing generated noise by means of air intake bypass. CONSTITUTION:Air intake bypass 16 is provided on a casing 15. Air is not allowed directly into the oscillation coil part 14 from air intake part 13 and instead, is bypassed through air intake bypass circuit 16 into the oscillation coil part 4. Consequently, noise is reduced by means of air intake bypass circuit 16. Thus noise leaking from air intake inlet 13 is muffled. |
