| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an interphone device which prevents noise from intruding from a gap between an inner cylinder packing and an outer cylinder packing which cover a microphone.SOLUTION: An interphone device includes: a front case 2 in which a microphone sound transmission hole 15 is opened on a front surface; a rear case 3 for housing an electrical substrate 7 and closing the rear side of the front case 2; a microphone holding cylinder part 30 which is erected around the microphone sound transmission hole 15 on the reverse side of the front case 2; and a hinge body 34 comprising a cup shaped inner cylinder packing 31 where a microphone 9 is attached with a sound collection surface facing the microphone sound transmission hole 15, and a cup shaped outer cylinder packing 33 which includes a sound transmission hole 32 on a bottom surface and fits on the outer side of the inner cylinder packing 31. The hinge body 34 is fitted in the microphone holding cylinder part 30. A taper part 35 obliquely cut is formed at a tip outer periphery of the outer cylinder packing 33, and an O ring 36 made of rubber is provided at a corner part of the microphone holding cylinder part 30 which contacts with the taper part 35.</p> |
