JPH0528872Y2 - - 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]

Public address telephones with built-in microphones are designed to prevent unnecessary sounds and vibrations from being transmitted to the microphone.

Conventionally, in such loudspeaker telephones, a sealed microphone chamber is formed within the housing.
To install a microphone for transmitting speech in this chamber, a support plate made of an elastic material such as rubber with a metal ring embedded therein is screwed into the microphone chamber.
A microphone was fitted into this ring. In addition, in order to pull out the lead wire, which is the external output wire connected to the microphone, to the outside of the microphone room, provide a relay terminal in the microphone room or on the microphone support plate, and connect the microphone lead wire to one terminal of this relay terminal. At the same time, a lead wire is further connected to the other terminal, and this lead wire is led to and connected to the input terminal of an amplifier disposed inside the housing outside the microphone room.

[Problems with background technology]

By the way, according to the conventional loudspeaker telephone mentioned above,
Attaching the microphone support plate with screws not only makes it easier for speaker vibrations to propagate to the microphone, but also prevents sound propagation from the speaker to the microphone because the microphone chamber is not airtight due to the microphone lead wire. It was difficult to prevent this. In addition, complicated work such as soldering to relay terminals is required, and metal rings,
The number of parts such as relay terminals is also large, which causes a significant decrease in assembly work efficiency.

[Purpose of invention]

In view of the above-mentioned problems, the present invention reduces the acoustic coupling between the speaker and the microphone, and
An object 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 object, the present invention provides a case in which a speaker is housed within the case of a case formed by joining a first cover and a second cover, and the speaker is directed from the first cover to the second cover. A loudspeaker telephone having a microphone chamber defined in the housing by an extending wall portion and surrounding a microphone, wherein a microphone is disposed in the microphone chamber and for attaching the microphone. a microphone support plate made of an elastic material and having a mounting portion; a support plate extending from the second cover to support the microphone support plate; and a lead for the microphone connected to the microphone support plate. A lead wire holder having a lead wire insertion hole for passing the wire through, and an insertion hole for inserting the lead wire holder, and facing the wall extending from the first cover. and a wall extending from the second cover to surround the microphone and form the microphone chamber, thereby maintaining airtightness of the microphone chamber despite the presence of the lead wire. This is to prevent sound propagation from unnecessary speakers.

[Example of idea]

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

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

The housing 1 of the loudspeaker telephone is composed of a first cover 2 as a housing main body and a second cover 3 as a housing member covering the bottom opening of the first cover 2. The first cover 2 and the second cover 3 are:
Bosses 4, 5 are formed on the inside of the second cover 3 and the first cover 2 so as to face each other and protrude from the inside, respectively, and are fastened with mounting screws 6, whereby the second cover 3 and the first cover 2 are attached and fixed together.

Further, at the rear of the housing 1, a speaker box 8 housing a speaker 7 for receiving calls is pressed and held between the first cover 2 and the second cover 3 via elastic bodies 9 and 10. On the other hand, there is a first
A microphone chamber 13 is formed by a wall portion 11 and a wall body 12 that are formed protrudingly opposite to each other inside the cover 2 and the second cover 3, and a microphone 14 for transmitting speech is installed in this microphone chamber 13. is accommodated.

FIG. 2 is an enlarged sectional view of a main part of the housing 1 showing the above-mentioned microphone chamber 13, and the same parts as in FIG. 1 are designated by the same reference numerals.

In FIG. 2, a microphone support plate 15 made of an elastic material such as rubber is arranged inside the microphone chamber 13, and a microphone 14 is mounted on this microphone support plate 15.
Microphone mounting part 1 that fits and supports the
6 and a lead wire holding portion 21 having lead wire insertion holes 19 and 20 for inserting and supporting lead wires 17 and 18 connected to the microphone 14 are integrally formed.

The main part of the microphone support plate 15 is supported by a support plate 22 that projects from the upper surface 3a of the second cover 3 forming the microphone chamber 13. Further, a boss portion 24 formed protruding from the upper surface 3a of the second cover 3 is fitted into a hole 23 formed in the center of the microphone support plate 15, and is positioned there. It is fixed by a push nut 25 that fits into the.

On the other hand, the lead wire holding portion 21 formed on the microphone support plate 15 is arranged in parallel to the wall 12 from the upper surface 3a of the second cover 3, as shown in FIG. 3, which is a top sectional view of FIG. holes 28, 2 in walls 26, 27
9 is fitted. Note that an insertion hole 30 for inserting the lead wire holding section 21 is formed in the wall body 12, and the lead wire holding section 21 of the microphone support plate 15 is also fitted into this insertion hole 30. In this way, when the first cover 2 is assembled to the second cover 3 holding the microphone support plate 15, the sealing member 31 (such as neoprene sponge) attached to the lower edge 11 of the wall 11 ( 2) is pressed against the upper surface of the wall 12 of the second cover 3 and the upper surface of the lead wire holding portion 21 of the microphone support plate 15, thereby forming a sealed microphone chamber 13 within the housing 1. ing. External sound is transmitted to the microphone 14 in the microphone chamber 13 via the through hole 2a formed in the first cover 2, and the sound from the speaker 7 in the housing 1 and other vibrations are transmitted to the microphone 14 in the microphone chamber 13. It is blocked by the box 8, the wall 11, the wall 12, and the microphone support plate 15.

Furthermore, since a gap is provided between the microphone support plate 15 and the second cover 3, vibrations from the speaker can be prevented from propagating to the microphone. Also, wall 2
6 and 27, it is possible to prevent vibrations from the speaker from propagating to the microphone.

In the above embodiment, the case where the present invention is applied to a public address telephone has been described, but the present invention can also be applied to other audio equipment having a built-in microphone.

[Effect of idea]

As described above, the present invention integrally molds the microphone support plate, the microphone mounting part, and the lead wire holding part having the insertion hole for the lead wire connected to the microphone with an elastic member, and the lead wire holding part is attached to the second part. 1
Because it is sandwiched between the walls of the first cover and the second cover, the airtightness of the microphone room can be maintained despite the presence of lead wires, and unnecessary sound propagation from the speaker can be prevented. . Furthermore, the number of parts is reduced, and assembly work and maintenance and inspection work are facilitated. Furthermore, the speaker sound propagation space inside the housing can be airtightly isolated from the microphone room, and the speaker sound can be prevented from propagating from inside the housing to the microphone.

[Brief explanation of drawings]

FIG. 1 is a conceptual sectional view of a loudspeaker telephone according to the present invention, FIG. 2 is an enlarged sectional view of a main part of a housing showing a microphone chamber, and FIG. 3 is a top sectional view of FIG. 2. 1... Housing, 2... First cover, 3... Second
cover, 7... speaker, 11... wall, 12
... Wall, 13 ... Microphone room, 14 ... Microphone, 15 ... Microphone support plate, 16 ... Microphone mounting part, 17, 18 ... Lead wire, 19, 2
0... Lead wire insertion hole, 21... Lead wire holding part, 22... Support plate, 30... Insertion hole.

Claims (1)

[Claims for Utility Model Registration] A speaker is housed in a 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, which is defined in the housing by a wall portion formed of a microphone support plate made of an elastic material, a support plate extending from the second cover to support the microphone support plate, and a support plate connected to the microphone support plate and passing through a lead wire of the microphone; a lead wire holder having a lead wire insertion hole for inserting the lead wire; 2. A loudspeaker telephone comprising: a wall extending from a cover of No. 2, surrounding the microphone and forming the microphone chamber.