JPH0514632Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a public address telephone in which a microphone chamber is defined within a housing containing a speaker.

[Technical background of the invention]

Conventionally, in audio equipment such as a loudspeaker telephone, a microphone has been supported on a mounting plate via a stand, and the microphone mounting plate has been fixed to the bottom plate of the casing of the loudspeaker telephone by screwing.

In addition, in the loudspeaker telephone, the area around the microphone is sealed inside the housing to prevent acoustic coupling between the speaker and the microphone disposed inside the housing. To seal this microphone, a recess is formed at the bottom of the housing to surround the microphone mounting plate, a soft rubber such as neoprene sponge is housed in the recess, and a wall formed on the main body of the housing is inserted into the recess to surround the microphone mounting plate. A microphone chamber was formed by fitting the microphone into the recess, and the microphone was hermetically housed therein.

Note that in the above-mentioned loudspeaker telephone, the microphone mounting plate supporting the microphone was fixed to the bottom plate of the housing using screws.

[Problems with background technology]

By the way, according to the above-mentioned conventional loudspeaker telephone, the microphone mounting plate supporting the microphone is fixed to the bottom plate of the housing using screws.
Vibrations from the speaker easily propagate to the microphone, and since soft rubber such as neoprene sponge is used to seal the microphone, the number of parts is large, increasing the number of steps and significantly reducing assembly work efficiency.

[Purpose of the invention] In view of the above-mentioned problems, the present invention reduces the acoustic coupling between the speaker and the microphone, and
The purpose of the present invention is to provide a loudspeaker telephone with a reduced number of parts and improved assembly workability.

[Summary of the idea]

In order to achieve this purpose, in the present invention, in a loudspeaker telephone in which a microphone chamber is defined within a housing containing a speaker, the support plate that supports the microphone is formed of an elastic material such as rubber, and the microphone chamber is defined. A support plate pressing and holding part is pressed and held between the end of the wall of the first cover and the second cover.

[Example of idea]

An embodiment of the loudspeaker telephone according to the present invention will be described in detail below.

FIG. 1 shows a longitudinal cross-sectional view of a loudspeaker telephone according to the present invention.

The housing 1 of this loudspeaker telephone has a first cover which is an upper cover.
and a second cover 3 serving as a housing member that covers the lower opening of the first cover 2, and each of the first cover 2 and the second cover 3 is The boss portions 2a and 3a formed protrudingly on the first cover 2 and the second cover 3 are attached with the mounting screws 4.
They are fixed together by tightening and fixing them.

Also, at the rear of the housing 1 is a speaker 5 for receiving calls.
The speaker box 6 that houses the first cover 2
Elastic bodies 7, 8 such as rubber are placed between the second cover 3 and the second cover 3.
It is held in between.

On the other hand, a microphone chamber 10 is formed in the front of the housing 1 to accommodate a microphone 9 for transmitting speech. As shown in the cross-sectional view of FIG. 2, this microphone chamber 10 includes a wall portion 2b having a U-shaped cross section formed in front of the first cover 2, and a second wall portion 2b at a position corresponding to the wall portion 2b. A U-shaped convex portion 3b is formed on the cover 3, and the end portion of the wall portion 2b is inserted into and attached to the inside of the U-shaped convex portion 3b. On the other hand, the microphone 9 is fitted into a microphone mounting portion 11a formed integrally with the support plate 11, and is supported there. This support plate portion 11 has a pressing and holding portion 11b formed around it except for one side (FIG. 3).
This support plate portion 11 is connected to the microphone chamber 1.
0, remove the second cover 3 of the housing.
The support plate 11 is arranged and positioned within the convex portion 3b formed on the first cover 2, and then the support plate portion 1 is inserted into the end portion 2b' of the wall portion 2b formed on the first cover 2.
1 by pressing the first pressing and holding part 11b.
cover 2 is assembled, whereby the support plate portion 11 is sandwiched between the second cover 3 and the wall portion 2b end portion 2b' of the first cover 2.

In the loudspeaker telephone assembled in this way, the microphone chamber 1 in which the microphone 9 is housed is
0 is the end 2b' of the first cover 2 and the second cover 3
The inside of the casing is sealed by the elastic support plate portion 11 that is pressed and held between the casing and the casing.

Therefore, it is possible to prevent the sound from the speaker 5 from entering the microphone chamber 10 through the inside of the housing.

In the above embodiment, since the pressing and holding portion 11b is further surrounded by the convex portion 3b, propagation of the vibrations of the speaker can be prevented. Furthermore, since a space is provided below the support plate portion 11 of the microphone, propagation of vibrations from the speaker can be prevented.

In the above embodiments, a loudspeaker telephone has been described, but the present invention is applicable not only to a loudspeaker telephone but also to tape recorders and other audio equipment with built-in microphones.

[Effect of idea]

In the present invention, a microphone is supported on a support plate made of an elastic material such as rubber, and a pressing and holding part of this support plate is used as a first support plate that forms a microphone chamber.
Since the microphone is held and held by pressing between the end of the wall body formed on the cover and the second cover, the number of parts is reduced when installing and housing the microphone, and the assembly work is facilitated. Furthermore, since the pressing and holding portion of the support plate portion is pressed and held, it is possible to prevent the vibrations of the speaker from propagating to the microphone.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a housing showing an embodiment of a loudspeaker telephone according to the present invention, FIG. 2 is a partial cross-sectional view showing an enlarged microphone chamber shown in FIG. 1, and FIG.
The figure is a partial sectional view taken along the line A--A in FIG. 1. DESCRIPTION OF SYMBOLS 1... Housing, 2... First cover, 2b... Wall part, 2b'... End part, 3... Second cover, 5...
Speaker, 9...Microphone, 10...Microphone chamber, 11...Support plate section, 11a...
Microphone attachment part, 11b...pressing clamping part.

Claims (1)

[Claims for Utility Model Registration] A speaker is contained within the housing of a housing formed by joining a first cover and a second cover, and extends from the first cover toward the second cover. A loudspeaker telephone having a microphone chamber for surrounding a microphone, defined in the housing by a wall section, the wall section being disposed in the microphone chamber and extending from the first cover. A support plate portion formed of an elastic body and having a pressing and clamping portion that is pressed and clamped between an end portion and the second cover, and a microphone mounting hole extending from the support plate and having a microphone mounting hole for mounting the microphone. A loudspeaker telephone characterized in that it is equipped with a microphone mounting part.