JPH048689Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a sealed structure for a microphone chamber in an electronic device.

[Technical background of the invention]

In a public address telephone, a speaker and a microphone are housed in a device housing, and the microphone is housed in a microphone chamber whose periphery is sealed inside the housing to prevent acoustic coupling with the speaker.

FIG. 3 shows a conventional sealed structure of a microphone chamber in a public address telephone. In this loudspeaker telephone, a device housing 3 is formed by fitting an upper case 1 and a lower case 2 together. At the corners of the upper case 1, partition plates 4 and 5 are erected in connection with the upper plate 1a of the upper case 1, and the lower case 2
Partition walls 6 and 7 are arranged at the corners of the . Recesses 8 and 9 are formed in these partition walls 6 and 7 downward from the top surface, and elastic members 10 such as neoprene sponge are loaded into these recesses 8 and 9.

When the upper case 1 and the lower case 2 are fitted together, a microphone chamber 11 is formed at a corner of the device housing 3. At this time, microphone room 11
For example, the 4th section, which is the AA cross section in Figure 3,
As shown in the figure, since the lower end surface 5a of the partition plate 5 presses the elastic member 10, the partition plates 4, 5
The meeting area between the partition walls 6 and 7 is sealed.

[Problems with background technology]

By the way, when cutting the elastic member 10 such as neoprene sponge, it is difficult to cut the elastic member 10 to exact dimensions, and the cut dimensions tend to vary. Therefore, if the dimensions are too short, as shown in FIG. 4, the gap 12a formed in the end surface 10a of the elastic member 10 must be closed even after the upper and lower cases 1 and 2 are fitted together. I couldn't do it. As a result, in the conventional sealed structure, there was a risk that vibrations from a speaker (not shown) would be transmitted into the microphone chamber 11 through the gap 12.

[Purpose of invention]

In view of the above circumstances, it is an object of the present invention to provide a sealed structure for a microphone chamber in an electronic device, which can reliably close the gap generated at the end face of an elastic member.

[Summary of the idea]

Therefore, in the present invention, a protrusion inclined toward the side end face of the partition plate is provided at the end of the lower end face of the partition plate that presses the elastic member, and the protrusion spreads the end face of the elastic member. In this way, the above objectives are achieved.

[Example of idea]

Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings.

FIG. 1 shows the sealed structure of a microphone chamber constructed in a loudspeaker telephone.

The equipment housing 20 of this loudspeaker telephone includes an upper case 2
1 and a lower case 22. The upper plate 21a of the upper case 21 has partition plates 23 and 24 L.
These partition plates 23, 24 are installed vertically in the shape of a letter.
Protrusions 25 and 26 are provided at the ends of the lower end surfaces thereof, respectively. And these protrusions 25, 26
As illustrated in FIG. 2, each partition plate 23, 2
4, respectively.

On the other hand, partition walls 27 and 28 are provided in the lower case 22 at positions corresponding to the partition plates 23 and 24. These partition walls 27 and 28 consist of two L-shaped guide plates 29 and 30, and a block 31 disposed between these guide plates 29 and 30 forms a recess 3 on the upper surface of the partition walls 27 and 28.
2 and 33 are formed. Then, the recess 3
Elastic members 34 such as neoprene sponges are loaded into the insides of the elastic members 2 and 33, respectively.

When the microphone chamber 35 is formed in the device housing 20 by fitting the upper case 21 and the lower case 22, the second
As shown in the figure, the protrusion 26 of the partition plate 24 is wedged into the elastic member 34, and the inclined surface 26a of the protrusion 26 is
The force acting on the elastic member 34 causes the end surface 3 of the elastic member 34 to
It is especially pushed out to the 4a side.

Therefore, even if a gap occurs between the lower case 22 and the end surface 34a of the elastic member 34 due to reasons such as the cut size of the elastic member 34 being too short or misalignment during fitting, The gap is upper and lower case 2
It is closed when 1 and 22 are fitted.

[Effect of idea]

As explained above, in the sealed structure of the electronic device according to the present invention, the inclined surface of the protrusion provided at the end of the lower end surface of the partition plate constantly presses the end surface of the elastic member in the direction of expanding it. It is possible to reliably close the gap formed on the end face.

[Brief explanation of the drawing]

1 and 2 show an example in which the sealed structure of the microphone chamber according to the present invention is applied to a loudspeaker telephone, and FIG. 1 is a partially cutaway assembled perspective view of a telephone housing equipped with the sealed structure. Figure 2 is a cross-sectional view taken along line BB of the equipment housing in Figure 1 after assembly, and Figures 3 and 4 show the conventional sealed structure of the microphone room.
FIG. 3 is a partially cutaway assembled perspective view of an electronic device casing with a conventional sealed structure, and FIG. 4 is a sectional view taken along line AA of the device casing of FIG. 3 after assembly. 21... Upper case, 22... Lower case, 23...
...Partition plate, 23a...Side end surface, 24...Partition plate,
24a...Side end surface, 25...Protrusion, 25a...Slope, 26...Protrusion, 26a...Slope, 27,
28... Partition wall, 32, 33... Recess, 34... Elastic member, 34a... End surface, 35... Microphone chamber.

Claims (1)

[Scope of utility model registration request] A recess is formed in the partition wall formed inside the lower case, an elastic member is loaded into the recess, and a partition plate is provided in the upper case, and when the upper case and the lower case are fitted together, In a sealed structure for a microphone chamber in an electronic device, in which the elastic member is pressed against the lower end surface of the partition plate of the upper case to seal the microphone chamber, an end portion of the lower end surface of the partition plate is attached to the side of the partition plate. A sealed structure for a microphone chamber in an electronic device, characterized by having a protrusion inclined toward an end surface.