JP2602621Y2 - Equipment with built-in microphone - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a microphone built-in device, such as a transceiver or a cordless telephone, in which a microphone is built in a casing constituting the device main body. The present invention relates to an improvement in sound collection of a microphone, which is provided with a waterproof sheet having a flesh portion, which is caused by the above-described waterproof / dustproof measures.

[0002]

2. Description of the Related Art In a conventional microphone built-in device, a through hole for sending voice from a built-in microphone from outside of a casing has a constant diameter and is not devised at all.

[0003]

[Problem to be solved by the invention] In a device with a built-in microphone,
For waterproofing and dustproofing, the smaller the through hole for sending voice to the built-in microphone, the better. However, since the size of the through-hole is limited, a waterproof sheet having a thickened reinforcing portion is interposed between the microphone and the casing, so that waterproofing and dustproofing are perfected.

However, in the conventional microphone built-in device, when the thick reinforcing portion of the waterproof sheet is positioned in the through hole for sending the sound, the sound from the outside of the casing is strongly blocked by the waterproof sheet, and is sufficiently sufficient as prescribed. There is a problem that the sound does not reach the microphone, and consequently the microphone does not function as intended because the sound cannot be picked up sufficiently. In order to solve this problem, it is conceivable to select a thinner waterproof sheet or to replace the waterproof sheet with one without a thickened reinforcing portion. However, it is not possible to obtain the strength of the waterproof sheet and lack practicality. The problem comes.

The present invention has been made in view of the above circumstances, and a through hole for sending voice from the outside of the casing to the built-in microphone is suppressed to a predetermined size for waterproofing and dustproofing. The waterproof sheet to be interposed between the casing and the casing has a thickened portion in terms of strength, and the sound from the outside of the casing is not interrupted and reaches the built-in microphone sufficiently, so that the sound collecting function of the microphone is as specified. It is intended to provide a device with a built-in microphone that is secured.

[0006]

According to the present invention, a cross-section of a through-hole for sending sound from the outside of the casing to the built-in microphone side is tapered so that the inside opening is larger than the outside opening of the casing. It is a device with a built-in microphone configured in a shape.

The detailed configuration is provided with a casing, a microphone built in the casing, and a waterproof sheet having a thick reinforcing portion interposed between the casing and the microphone, and the microphone is provided. A through hole is provided at a portion of the casing for sending sound from the outside of the casing to the microphone, and the cross section of the through hole is tapered so that the inner opening of the casing has a larger opening area than the outer opening. This is a microphone built-in device formed in a shape.

[0008]

Since the opening inside the casing of the through hole has a larger area, the area for the built-in microphone to pick up sound is larger.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to an embodiment shown in FIGS. However, the present invention is not limited by this embodiment.

[0010] Cordless telephone 1 as a built-in microphone device
As shown in FIGS. 1 to 3, a casing 2, a speaker 3 and a microphone 4 built in the casing 2, a waterproof sheet 5 interposed between the casing 2 and the speaker 3, and between the casing and the microphone 4, respectively. And 6 are provided.

An operation panel 7 and a liquid crystal display panel 8 are incorporated in the front of the casing 2. Further, an incoming call buzzer 9 is provided on the front surface of the casing 2, and a voice extracting unit 10 of the speaker 3 and a voice sending unit 11 to the microphone 4 are formed.

The voice extracting unit 10 is provided with a through hole 12 provided in the casing 2, and the through hole 12 is for sending out the voice of the speaker 3 to the outside of the casing 2 through the through hole 12.

The voice sending section 11 is provided with a through hole 13 provided in the casing 2, and the through hole 13 sends a user's voice to the microphone 4 built in the casing 2 therethrough.

Each of the waterproof sheets 5 and 6 has a hole of about several microns and has air permeability and waterproofness. The waterproof sheets 5 and 6 are both adhered to the casing 2. Also, waterproof sheets 5 and 6
Are provided with thick reinforcing portions 14 and 15 in a mesh shape, respectively.

Further, the cordless telephone 1 is shown in FIG.
The cross section of the through hole 12 is formed in a tapered shape so that the inner opening of the casing 2 has a larger opening area than the outer opening. 16 is a taper part. Specifically, the thickness of the casing 2 of the audio extraction unit 10 is 1.7.
The outer opening of the casing 2 of the through hole 12 has a diameter of 1 mm, the through hole 12 has a tapered shape from substantially the center, and the inner opening has a diameter of 2 mm.

Reference numeral 17 denotes a packing, and reference numeral 18 denotes a retaining plate for fixing the speaker 3 to the casing 2.

In addition, as shown in FIG. 3, the cordless telephone 1 is formed such that the cross section of the through hole 13 is tapered so that the area of the inside opening of the casing 2 is larger than that of the outside opening. 19 is a tapered part. More specifically, the thickness of the casing 2 of the sound feeding unit 11 is 2 mm, the outside opening of the casing 2 of the through hole 12 is 1 mm in diameter, and the through hole 12 is tapered from substantially the center. The inner opening is 3 millimeters in diameter.

Reference numeral 20 denotes a rubber cover for protecting the microphone 4.

The cordless telephone 1 is configured as described above. Therefore, the cordless telephone 1 has a casing 2
Since the outside opening of the casing 2 has a smaller diameter as in the prior art, a waterproof and dustproof function can be obtained at the outside opening of the casing 2. On the other hand, since the casing inner opening of the through hole has a larger area, the area for the built-in microphone to pick up sound is larger. Therefore, the microphone 4 can pick up sound from the outside of the casing 2 from the portion of the waterproof sheet 6 other than the thick reinforcing portion 15. The microphone 4 picks up this sound and changes it into a predetermined signal.
The cordless telephone 1 can talk with other stations without any trouble in transmission. The microphone 4 determines the level of variation in sound pressure as a guide for picking up sound from the casing 2. When the cordless telephone 1 is in a normal use state, the diameter of the through hole 13 is the same as before. In the case of the tapered through hole 13 of the present invention, a small value of ± 3 dB was obtained, whereas the value was ± 6 dB, and it was confirmed that the value was improved.

Since the sound from the speaker 3 has the through hole 12 having a tapered shape, the resonance of the casing 2 is small and no chattering sound is generated, and a sound which is easy to hear is obtained.

In this embodiment, the present invention is used for the cordless telephone 1. However, the present invention can be widely used for a device having a built-in microphone such as a transceiver.

In this embodiment, the tapered portion 19 has the through hole 1
3, the formation position may be appropriately selected depending on the thickness of the casing 2, processing accuracy, and the like.

[0023]

According to the present invention, the through hole for sending the sound from the outside of the casing to the built-in microphone has a tapered cross section so that the inside opening is larger than the outside opening of the casing. The outside opening of the casing of the through hole can be kept small, ensuring waterproof and dustproof.In addition, sound from the outside of the casing is blocked even if a waterproof sheet with a thickened reinforcement is interposed between the casing and the microphone. It is a device with a built-in microphone that reaches the built-in microphone less frequently and that ensures the sound pickup function of the microphone as predetermined.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II of the embodiment shown in FIG.

FIG. 3 is a sectional view taken along the line II-II of the embodiment shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cordless telephone (device with a built-in microphone) 2 Casing 3 Speaker 4 Microphone 5, 6 Waterproof sheet 10 Audio extraction part 11 Audio sending part 12, 13 Through hole 14, 15 Reinforced thick part 16, 19 Tapered part

Claims (1)

(57) [Scope of request for utility model registration] 1. A casing, a microphone built in the casing, and a waterproof sheet having a thick reinforcing portion interposed between the casing and the microphone are provided, and the casing is provided with a microphone. A through-hole for sending sound from the outside of the casing to the microphone is provided, and a cross-section of the through-hole is formed in a tapered shape such that an inner opening of the casing has a larger opening area than an outer opening. Device with built-in microphone.