JP3240413B2 - Electric sounder for small radio - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric sounder used for a small radio such as a portable telephone and a pager.

[0002]

2. Description of the Related Art FIGS. 6 and 7 show an example of an electric acoustic device incorporated in a small radio such as a pager. As shown in the figure, the electroacoustic device is housed in a main body case 50, and an electroacoustic conversion unit is provided in the inner case 51.
The electroacoustic conversion unit includes a disc-shaped yoke 52, a pole piece 53 made of a magnetic material, a coil 54 provided on the pole piece 53, a ring-shaped magnet 55, and a disc-shaped diaphragm. This is an electromagnetic electroacoustic conversion unit consisting of 56 units.

A front case 58 having a sound hole 57 on the front side and a terminal board 60 having a connection terminal 59 on the rear side are fixed to the main body case 50, respectively. A partition plate 62 having a sound hole 61 is provided in 58, and a front air chamber 63 and a resonance chamber 64 are formed.

In this electroacoustic device, the vibration sound of the diaphragm 56 first resonates in the front air chamber 63, then enters the resonance chamber 64 through the sound hole 61, resonates in the resonance chamber 64, and then resonates. Release outward from 57.

[0005]

The above-described electroacoustic device has a height dimension (thickness) because the front case 58 is greatly extended in front of the main body case 50 due to the formation of the resonance chamber 64. The size of the electroacoustic device is large.
Further, the main body case 50, the inner case 51, and the front case 58
In addition, since the electric acoustic device is provided with the middle partition plate 62, the electroacoustic device is generally large.

[0006] As a result, it has become difficult to incorporate an electric acoustic device as the miniature radio device is further miniaturized. There is a problem that it cannot be incorporated in the form.

In view of the above-mentioned circumstances, the present invention is to reduce the size by making the height dimension as short as possible and to use the radio equipment case as a part of the acoustic case. The aim is to develop the intended electroacoustic device.

[0008]

An electroacoustic apparatus according to the present invention comprises:
An acoustic mechanism comprising an electromagnetic electroacoustic conversion unit and an acoustic case including the electroacoustic conversion unit is provided;
The above-mentioned acoustic case includes an electroacoustic conversion unit.
A frame to form a front air chamber in front of the unit
To form a resonance chamber on the side of the electroacoustic conversion unit.
The communication between the concave part and the front air chamber and the resonance chamber
A notch provided in the frame-shaped portion is provided, and the above-described acoustic mechanism is incorporated in a small- sized radio , and the frame-shaped portion of the acoustic case and the radio device case are provided.
The front chamber with the concave part of the acoustic case and the radio case.
And the resonance chambers are formed, and the above-mentioned resonance chambers are communicated with the sound holes provided in the wireless device case.

[0009]

[Action] A frame of an acoustic case having an electroacoustic conversion unit
A front air chamber and a resonance chamber are formed as a structure that covers the shape portion and the concave portion of the acoustic case with the radio device case portion. That is, the electroacoustic device has an integral structure with the wireless device case, and furthermore, since the resonance chamber is formed on the side of the acoustic mechanism, the electroacoustic device is sufficiently flattened and miniaturized. Becomes

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the acoustic mechanism as viewed from the front,
FIG. 2 is a partial view of a wireless device showing a state where an acoustic mechanism is assembled in a wireless device case to constitute an electric acoustic device, and FIG.
4 is a sectional view taken along line BB in FIG. 3, and FIG. 5 is a sectional view taken along line CC in FIG.

As can be seen from FIG.
And an acoustic case 3 provided with the electroacoustic conversion unit 2.

As shown in the drawings, the electroacoustic conversion unit 2 has a disk-shaped yoke 5 from which a pole piece 4 is projected, a coil 6 provided around the pole piece 4, and a ring. It has a known configuration including a magnet 7 in the shape of a circle.

The acoustic case 3 is made of a synthetic resin material, and its front side is open. A ring-shaped portion (frame- shaped portion) 8 having the electroacoustic conversion unit 2 is provided. Concave portion 9 provided to form a resonance chamber on the side
And a communication section 10 for guiding the vibration sound of the diaphragm 1 to the sound hole. In addition, a notch 11 is provided in the ring-shaped portion 8 to communicate a front air chamber formed on the front side of the diaphragm 1 with the concave portion 9, and the concave portion 9 has a sound through the communication portion 10. It is configured to communicate with the hole.

Further, two power supply terminals 12 and 13 electrically connected to the coil 6 are fixed to the rear side of the acoustic case 3. These power supply terminals 12 and 13 are conductive elastic plates,
The base portion is fixed to the acoustic case 3 and bent so that the front end surface floats.

In the above-described acoustic mechanism, the front side and the side surface of the acoustic case 3 are fixed to the inner surface of the radio device case 14 with an adhesive. When the acoustic mechanism is assembled in this way, the diaphragm 1
A front chamber 15 is formed between the wireless device case 14 and the wireless device case 14, and the concave portion 9 is covered by the wireless device case 14 to form a resonance chamber 16. Further, the resonance chamber 16 communicates with a sound hole 17 provided in the wireless device case 14 through the communication portion 10 covered by the wireless device case 14.

A sound hole 17 provided in the wireless device case 14 is provided.
A filter 18 such as a polymer waterproof film is provided at the back of the device. The filter 18 is adhered so as to have an appropriate degree of tension, and the filter itself vibrates to eliminate acoustic loss and to have a dustproof and waterproof effect.

On the other hand, as shown in FIG. 5, the power supply terminals 12 and 13 are covered with a case lid 19 on the acoustic case 14 so that the terminal board 20 provided on the case lid 19 is provided. It comes into contact with the elastic action and enables an electrical connection with the coil 6. With such a power supply terminal configuration, the step of soldering the lead wire of the coil 6 and the flexible substrate is not required, and the operation such as replacement of the acoustic mechanism is simplified.

In the electroacoustic apparatus constructed as described above, the vibration sound of the vibration plate 1 generated by the feeding of the coil 6 first resonates in the front air chamber 15 and then passes through the notch 11 to the resonance chamber 16. After resonating again in the resonance chamber 16,
The sound is emitted from the sound hole 17 through the communication portion 10.

[0019]

As described above, according to the present invention, an electric mechanism comprising an electroacoustic conversion unit and an acoustic case including this unit is mounted on a small radio, so that the electroacoustic apparatus can be a radio. It is constructed integrally with the case.
As a result, there is no need for a partition plate for forming the front air chamber or a front case for forming the resonance chamber, and the number of parts is reduced, resulting in a miniaturized electroacoustic device. In particular, since the resonance chamber is formed at the side position of the electroacoustic conversion unit, that is, at a position orthogonal to the vibration direction of the diaphragm, the resonance chamber has a flat structure with increased sound pressure, and is optimal for a small radio device. It becomes an electroacoustic device.

[Brief description of the drawings]

FIG. 1 is a perspective view of an acoustic mechanism shown as one embodiment of the present invention.

FIG. 2 is a partial view of a small wireless device in which the acoustic mechanism is assembled to a wireless device case to form an electric acoustic device.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a sectional view taken along line BB in FIG. 3;

FIG. 5 is a sectional view taken along line CC in FIG. 2;

FIG. 6 is a front view of an electric acoustic device shown as a conventional example.

FIG. 7 is a sectional view taken along line DD in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Diaphragm 2 Electroacoustic conversion unit 3 Acoustic case 8 Ring part 9 Concave part 10 Communication part 11 Notch part 12, 13 Power supply terminal 14 Radio case 15 Front air chamber 16 Resonance chamber 17 Sound hole 18 Filter 19 case lid 20 terminal board

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-71299 (JP, A) JP-A-2-143860 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G10K 9/22 H04B 1/38 H04Q 7/14

Claims (1)

(57) [Claims] 1. A sound comprising an electromagnetic electroacoustic conversion unit and an acoustic case provided with the electroacoustic conversion unit.
The sound case is provided with an electroacoustic conversion unit.
Form a front air chamber in front of the unit with a knit
And a resonance chamber on the side of the electroacoustic conversion unit.
And a concave portion for forming
A notch provided in the frame portion to be communicated with,
Built-in sound mechanism to small radio was, acoustic Ke - vinegar Wakugata part
And the wireless device case, and the concave part of the acoustic case
Line Machine Ke - scan each form a resonance chamber in the, and the <br/> resonance chamber which is the radio Ke - for small radios, characterized in that it has a configuration for communicating the sound holes provided to the scan Electric sounder.