JP2001189981A - Sounder for small-sized wireless unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sounder contained in a small-sized wireless unit, such as a cellular phone that can be contained in a small volume and emits sound in the forward direction. SOLUTION: In the small-sized wireless unit, containing the sounder 1 emitting sound in front of a case in the inside of the thin case, a vibrating direction of a diaphragm 7 of the sounder 1 is selected to be the thickness direction of a housing 2 of the sounder 1, and a sound emission port 14 is provided to a side of the housing 2. The sounder 1 can be contained in a small space, and the sound is emitted forward of the case. Accordingly, the sounder can cope with the downsizing as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound generator for a small wireless device such as a portable telephone or a handy transceiver.

[0002]

2. Description of the Related Art The technology related to the above-mentioned small radio is evolving with the progress of the technology, and is improved so as to be smaller and lighter. Under such circumstances, there is a limit to the miniaturization of each part, and there is a great deal of difficulty in arranging parts for adapting to the overall miniaturization. In other words, in this kind of small-sized radio, all the operation parts are brought on the surface of the thin case, so that the dimensional restrictions are severe.

Generally, a speaker unit including a magnetic circuit and a diaphragm is used as a sound generator of a small wireless device. Since sound is generated by the vibration of the diaphragm, the direction of the diaphragm is set to the direction of the case. I want to match the surface. However, in this case, a part of the limited area is occupied by the speaker unit.

To solve this problem, a speaker unit has been devised in which the sound generated by the speaker unit is arranged inside the case and guided to the front of the case.
No. 1650. This is to attach the speaker to the back of the liquid crystal display unit provided on the surface of the case,
The sound generated by the speaker is guided to the surface of the case by the sound guide section. According to the present invention, since it is not necessary to mount the speaker on the front surface of the case, the size of the display unit and the operation keys can be increased accordingly.

[0005] However, even in the present invention, the speaker takes up the volume in the horizontal direction with respect to the case.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of this point, and enables a limited area of a case to be effectively used for arranging operation keys, etc. It is intended to provide a structure that can radiate efficiently.

[0007]

According to the present invention, as a means for solving the above-mentioned problems, according to the first aspect of the present invention, there is provided a sound generating device for emitting a sound into a thin case inside a front surface of the case. In the stored small wireless device, a vibration direction of the diaphragm of the sound generating device is set to a thickness direction of a housing of the sound generating device, and a sound emission port is provided on a side of the housing.

According to a second aspect of the present invention, in the first aspect, the housing is formed by joining an upper cover and a lower cover, and a speaker unit is fitted to the lower cover. A speaker unit composed of a magnetic circuit and a diaphragm is accommodated in the concave portion, and a duct portion is formed in the upper cover in a direction orthogonal to the vibration direction of the diaphragm of the speaker unit. Is formed in the sound emission port.

According to the first aspect of the present invention, since the vibration direction of the diaphragm of the sound generator is set to the thickness direction of the housing of the sound generator, the sound generated by the diaphragm is orthogonal to the thickness direction of the housing. Direction. This sound is radiated from a radiation port provided on the side of the housing. According to the third aspect of the invention, sound is radiated from the sound radiation port at the tip of the duct portion in a direction orthogonal to the vibration direction of the diaphragm to the front surface of the case of the small wireless device.

[0010]

Embodiments of the present invention will be described below. FIG. 1 shows a cross section of a housing 2 of a sound generating device 1 and the inside thereof. Housing 2 as shown
Is formed by joining the upper cover 3 and the lower cover 4. As shown in FIG.
The lower cover 4 is provided with a small hole 4a into which the lower cover 4 is fitted. These projections 3a and small holes 4
“a” is provided at the four corners, and performs positioning when the upper cover 3 is joined to the lower cover 4.

The lower cover 4 is provided with a flange 4b at one end. After the lower cover 4 is joined to the upper cover 3, one end of the upper cover 3 is covered. The flange 4b is used for fixing the sound generating device 1 to a casing when the sound generating device 1 is incorporated in a mobile phone or the like, as described later.

In the housing 2 formed by the upper cover 3 and the lower cover 4, a speaker unit 5 having the following structure is accommodated. The speaker unit 5 is held by fitting the speaker unit 5 into a concave portion 4c formed in the lower cover 4. The speaker unit 5 includes a diaphragm 7 having a voice coil 6 mounted on the back surface thereof, a disk-shaped magnet 8, a pole piece 9 and a frame 10, and the inside of the voice coil 6 wound on the back surface of the diaphragm 7. Has a magnet 8
And the pole piece 9 are overlapped. A step of the frame 10 is located outside the voice coil 6.

With this structure, the magnetic force generated by the magnet 8 circulates between the pole piece 9 and the frame 10, so that a magnetic circuit is formed. At the front of the diaphragm 7, a protector 11 and a damper 12 are provided in an overlapping manner. Since the above structure is located substantially inside the lower cover 4, the inside of the upper cover 3 is a space. Therefore, this space is made to function as the duct portion 13 of the housing 2 so that sound is radiated in a direction orthogonal to the vibration direction of the diaphragm 7. An opening is provided at one end of the housing 2, which is the tip of the duct portion 13, and this is formed in the sound emission port 14 (see FIG. 3).

A terminal plate 15 is provided below the lower cover 4 (see FIG. 5). An external lead wire (not shown) is connected to the terminal plate 15 so that voice current is supplied to the voice coil 6. Is to be energized. Since the voice coil 6 is located between the pole piece 9 and the frame 10 constituting the magnetic circuit, the voice coil 6
When the sound current is supplied to the diaphragm 7, the diaphragm 7 vibrates to generate sound.

The generated sound is generated by the duct 13 of the housing 2.
Is reflected in the direction of the radiation port 14 and is radiated to the outside from here. By passing through the duct portion 13, there is no diffusion in a useless direction, and radiation is efficiently emitted forward.

FIG. 5 shows a portable telephone 16 which is a kind of a small radio. In this mobile phone 16, a button 17 of an operation switch and a liquid crystal display
Occupies most of the surface, and a sound emission port 20 is provided at an upper portion, and a sound collection hole 21 for a microphone is provided at a lower portion.
As described above, since the sound emission port 20 cannot have a sufficient area, the sound generating device 1 of the present invention is used by being mounted inside the case 19 of the mobile phone 16 as shown in FIG.

The mounting is performed by fitting the flange 4b of the housing 2 into a groove (not shown) provided in the case 19. By mounting in this manner, the plane of the housing 2 of the sound generating device 1 is oriented in the width direction of the case 19. Further, the vibration direction of the diaphragm 7 of the sound generating device 1 is the thickness direction of the housing 2 of the sound generating device 1, and the sound emission port 14 is directed to the side of the housing 2. Therefore, the sound is refracted as shown by the arrow in FIG.
Radiated forward of the

[0018]

As described above, the present invention is a sound generator for a small-sized radio device constructed as described above. According to the first aspect of the present invention, an operation unit and a display unit are provided on the surface of a thin case. As a result, in a small wireless device whose dimensional restrictions are strict, the sounding device can be housed in a small space, and sound can be emitted to the front of the case. This makes it possible to adapt to miniaturization as a whole.

According to the second aspect of the present invention, the structure of the housing of the sound generating device is simplified, the mounting of the speaker unit is ensured, and the volume of the duct portion is made as large as possible. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is a side view showing a state in which a housing in FIG. 1 is divided into upper and lower parts.

FIG. 3 is a front view of that of FIG.

FIG. 4 is a bottom view of that of FIG.

FIG. 5 is a front view of the mobile phone.

FIG. 6 is an explanatory diagram when the device of FIG. 1 is attached to the mobile phone of FIG. 5;

[Explanation of symbols]

 Reference Signs List 1 sound generating device 2 housing 3 upper cover 4 lower cover 4b flange portion 4c concave portion 5 speaker unit 7 diaphragm 13 duct portion 14 sound emission port 16 mobile phone 17 button 19 case

Claims (2)

[Claims] 1. A small wireless device in which a sound emitting device for emitting sound to the front of the case is housed inside a thin case, wherein a vibration direction of a diaphragm of the sound emitting device is a thickness direction of a housing of the sound emitting device. A sound emitting device for a small wireless device, wherein a sound emission port is provided on a side of the housing. 2. The housing is formed by joining an upper cover and a lower cover, and a recess for fitting a speaker unit is formed in the lower cover. A speaker unit including a magnetic circuit and a diaphragm is formed in the recess. 2. The housing according to claim 1, wherein the upper cover is formed with a duct portion in a direction orthogonal to the vibration direction of the diaphragm of the speaker unit, and a tip of the duct portion is formed as a sound emission port. Sound device for small radio.