JPH0241974Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a microphone support mechanism for a public address telephone or the like, and more particularly to a microphone support mechanism consisting of a rubber cap and case for sealing an electret condenser microphone (ECM).

[Technical background of the invention and its problems] Conventionally, this type of microphone support mechanism has an ECM 12 attached as shown in Figure 3 a and b.
Place the rubber cap 11 for ECM installation and sealing on the chassis 1.
Fit the fitting bracket 14 provided on the inner surface of the ECM 12 to the fitting bracket 14.
6 and a cabinet 17 was attached to prevent the sound to the microphone from leaking to the sides and rear. However, such conventional microphone support mechanisms have the disadvantage that they require a wide variety of gaskets to seal the ECM section, and are time-consuming to assemble.

[Purpose of the invention] The present invention was devised in view of the above-mentioned conventional difficulties, and aims to provide a microphone support mechanism that ensures sealing of the ECM with a small number of parts.

[Summary of the invention] In order to achieve the above object, the microphone support mechanism of the invention has a cavity inside which houses a microphone in a nearly sealed state, and a microphone hole provided approximately in the center of the front surface on the side where the case is attached. a rubber cap that surrounds a space opening on the front surface of the case mounting side through the rubber cap, has an elastic protruding rib on the front surface of the case mounting side that uniformly abuts the inner surface of the case, and has a convex part for fitting the case on the side surface; The case has a fitting bracket on the inner surface for fitting the case fitting protrusion of the rubber cap.

[Embodiments of the invention] Preferred embodiments of the invention will be described below with reference to the drawings.

In FIGS. 1 and 2, a rubber cap 1 for attaching and sealing the ECM is made of an elastic material such as synthetic rubber, and has a cavity 1a inside.
Electret condenser microphone (ECM) 6 is built into a so that there is no gap. Approximately in the center of the front of the case installation side of rubber cap 1
A MIC hole 7 is provided, and a sloped portion 1b is formed concentrically with the MIC hole 7, creating a space opening through the MIC hole 7 to the front surface on the case mounting side. Further, there are circular elastic protruding ribs 2, 2 which surround the space along the inclined portion 1b and uniformly abut against the inner surface of the case on the front surface of the case mounting side.
A is formed to protrude from the front surface.

Linear protruding ribs 2b are also formed outside the circles of the circular ribs 2, 2a. Furthermore, case fitting projections 8 are formed on both sides of the rubber cap 1. All of these are formed by integral molding when molding the rubber cap.

On the other hand, the chassis 3 on the case side has an ECM inside it.
A fitting bracket 4 is formed into which the case fitting convex portion 8 of the attachment/closing rubber cap 1 is fitted. 5 is the MIC hole.

When the case fitting protrusion 8 of the rubber cap 1 with the ECM 6 attached is fitted to the fitting bracket 4 of the chassis 3 configured in this way, the ribs 2, 2a, 2b on the front surface of the rubber cap 1 are uniformly formed on the inner surface of the chassis 3. The structure is such that it fits tightly to the body and prevents sound from leaking.

[Effects of the invention] As is clear from the above embodiments, according to the invention, a microphone hole is provided on the front surface of the ECM mounting/sealing rubber cap at approximately the center of the front surface of the case mounting side. An elastic protruding rib is provided on the front surface of the case installation side that surrounds the open space and contacts the inner surface of the case, so the front and back surfaces are reliably separated acoustically, creating a structure that prevents sound from leaking. This ensures sound collection and provides good acoustic characteristics. Furthermore, since packing and the like are not required and the ribs are integrally molded, it can be constructed from a single component, making it easy to assemble and producing a low-cost product.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a microphone support mechanism according to the present invention, FIG. 2 is a sectional view thereof, and FIGS. 3A and 3B are an elevation view and a side view, respectively, of a conventional microphone support mechanism. 1... Rubber cap for ECM installation and sealing, 1a
...Cavity, 2, 2a, 2b...Protruding rib, 3...
... Chassis (case), 4... Fitting bracket,
5...MIC hole, 6...ECM, 7...MIC hole, 8
...Protrusion for fitting.

Claims (1)

[Scope of utility model registration request] The case has a cavity on the inside that houses a microphone in a nearly sealed state, and the space that opens to the front surface of the case mounting side through the microphone hole provided approximately in the center of the front surface of the case mounting side is surrounded by a cavity on the front surface of the case mounting side. A rubber cap having an elastic protruding rib that uniformly contacts the inner surface and a case fitting convex portion on the side surface, and a fitting bracket on the inner surface for fitting the case fitting convex portion of the rubber cap. A microphone support mechanism comprising a case.