JPH0795689A - Loudspeaker unit - Google Patents

Abstract

PURPOSE:To provide a loudspeaker unit without deteriorating the characteristic of a speaker by the effect of the air in the neighborhood of a voice coil. CONSTITUTION:The loudspeaker unit is provided with a frame 15, a diaphragm 20 whose edge 22 is supported with the frame 15, the voice coil 25 wound around a coil bobbin 24 mounted on the diaphragm 20, and magnetic circuits 11-14 constituted around the voice coil 25, and a sound in accordance with a signal can be reproduced by supplying a prescribed signal to the voice coil 25. A through hole 11b is provided at a top plate 11 which constitutes the joining part of the magnetic circuits 11-14 and the frame 15 in the loudspeaker unit, and also, a through hole 12a is provided at a bottom plate 12 which constitutes the terminal parts on the side separated from the top plate 11 of the magnetic circuits 11-14.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an acoustic signal (voice signal).
The present invention relates to a speaker unit that is supplied with sound to perform sound reproduction.

[0002]

2. Description of the Related Art As a cone type speaker unit for reproducing music or the like, there is a speaker unit conventionally configured as shown in FIG. In FIG. 2, 11 is an outer peripheral side center plate, 12 is a bottom plate, 13 is a magnet, 14 is an inner peripheral side center plate, and this outer peripheral side center plate 11, bottom plate 12, magnet 13, inner peripheral side center plate 14 The magnetic circuit is composed of the magnet 13 on the inner peripheral side.
Are arranged. The inner magnet 13 and the bottom plate 1
2 and the inner peripheral side center plate 14 are formed with a through hole at the center. In this magnetic circuit, a predetermined gap is formed between the innermost peripheral portion 11a of the outer peripheral side center plate 11 and the outermost peripheral portion 14a of the inner peripheral side center plate 14, and the voice coil 24 described later is formed in this gap. Are placed. A frame 15 is mounted on the outer peripheral side center plate 11, and the edge portion 22 of the diaphragm 20 is supported by the pressing member 16 on the annular outermost peripheral portion of the frame 15.

The diaphragm 20 has a circular cone 21.
And an edge 22 on the outer periphery thereof, a center cap 23 and a coil bobbin 24 in the central portion, and a voice coil 25 is wound around the coil bobbin 24. The coil bobbin 2 around which the voice coil 25 is wound
4 is the innermost peripheral portion 11a of the outer peripheral side center plate 11
And the outermost peripheral portion 14a of the inner peripheral side center plate 14 are inserted into a gap formed therebetween. At this time, the dampers 26, 2 are attached to the coil bobbins 24 above and below the voice coil 25.
7, the upper damper 26 is connected to the frame 15, the lower damper 27 is connected to the outer peripheral side center plate 11, and the coil bobbin 24 is swingably supported by the upper and lower dampers 26 and 27. Such a structure in which the dampers are arranged above and below the voice coil is called a double damper structure. Such a double damper structure is applied to a relatively large speaker unit.

According to the speaker unit thus constructed, the coil bobbin 24 vibrates in response to the drive signal (audio signal) supplied to the voice coil 25, and the cone bobbin 24 vibrates by the coil bobbin 24 to cause the voice coil 25 to vibrate. A sound based on the audio signal supplied to is reproduced.

[0005]

By the way, in the speaker unit having such a structure, the space formed between the coil bobbin 24 and the dampers 26, 27 (the space indicated by a and b in FIG. 2) is substantially closed. It is a designated space. For this reason, the air in this space accumulates inside, the voice coil 25 heats up due to the vibration of the coil bobbin 24 and becomes high temperature, and the air in this space becomes a load resistance when the diaphragm vibrates. There is a problem that the vibration response is deteriorated and the frequency characteristic of the speaker is deteriorated. In particular, in the case of the speaker unit having the double damper structure as shown in FIG. 2, since the spaces a and b in both the upper part and the lower part of the voice coil 25 are substantially sealed, The problem becomes obvious.

In view of these points, an object of the present invention is to provide a speaker unit which does not deteriorate the characteristics of the speaker due to the influence of air around the voice coil.

[0007]

In the present invention, for example, as shown in FIG. 1, a frame 15, a diaphragm 20 having an edge 22 supported by the frame 15, and a coil bobbin 24 attached to the diaphragm 20. The voice coil 25 wound around the voice coil 25 and the magnetic circuits 11 to 14 formed around the voice coil 25 are provided. By supplying a predetermined signal to the voice coil 25, a sound corresponding to the signal is reproduced. In the speaker unit described above, the through hole 11b is provided in the top plate 11 forming the joint between the magnetic circuits 11 to 14 and the frame 15, and the end of the magnetic circuits 11 to 14 on the side away from the top plate 11 is formed. The bottom plate 12 has a through hole 12a.

Further, in this case, a damper 2 for swingably supporting the coil bobbin 24 is provided above and below the top plate 11.
6, 27 are arranged.

Further, in each case, the through hole 11b of the top plate 11 and the through hole 12a of the bottom plate 12 are provided.
To at least one of the taper portion 11c or 1
2b is provided.

[0010]

According to the present invention, the through holes 11b formed in the top plate 11 bring the air above and below the top plate 11 near the voice coil 25 into a conductive state, and the load resistance due to the air and the heat generation amount of the voice coil 25 are caused. In addition, the through hole 12a formed in the bottom plate 12 makes the outside of the speaker unit electrically conductive, and from this point as well, the load resistance due to air and the heat generation amount of the voice coil 25 are reduced.

In this case, above and below the top plate 11,
Dampers 26, 2 for swingably supporting the coil bobbin 24
By applying the present invention to the speaker unit having the double damper structure in which 7 is arranged, the air between the upper and lower dampers 26 and 27 becomes conductive, and the load resistance and the heat generation amount are reduced even with the double damper structure.

Further, by providing a predetermined taper portion 11c or 12b on at least one of the through hole 11b of the top plate 11 and the through hole 12a of the bottom plate 12, when air passes through the through hole. It is possible to prevent the generation of wind noise.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, parts corresponding to those of FIG. 2 described in the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a cross-sectional view showing a speaker unit of this example. In this example, a speaker unit having a double damper structure in which dampers 26 and 27 are arranged above and below a top plate 11 is provided, and the outer periphery thereof constitutes a magnetic circuit. A through hole 11b is provided in the side top plate 11, and a through hole 15a is also provided at a corresponding position of the frame 15 in contact with the top plate 11 so that both through holes 11b and 15a are continuous.
In this case, tapered portions 11c and 15b are provided at the outlets of the through holes 11b and 15a so that the diameters of the holes gradually increase. A plurality of through holes 11b and 15a are arranged at a predetermined interval.

A through hole 12a is also formed in the bottom plate 12 which constitutes the lower end of the magnetic circuit. This through hole 12a
In the case of, the taper part 1 where the diameter of the outlet hole gradually increases
2b is provided. A plurality of through holes 12a are arranged at a predetermined interval.

Further, in the present embodiment, the lower damper 27, which swingably connects the lower end portion of the coil bobbin 24 and the outer peripheral side top plate 11, is made of a breathable material (fiber or the like).

The other parts are constructed similarly to the speaker unit shown in FIG. 2 as a conventional example.

According to the speaker unit of this example having such a configuration, it operates as a speaker having good characteristics. That is, the spaces a and b formed between the coil bobbin 24 and the dampers 26 and 27 become conductive with the through holes 11b and 15a, and the space between the lower damper 27 and the bottom plate 12 (see FIG. 1) is also electrically connected to the outside by the through hole 12a of the bottom plate 12, and even if the coil bobbin 24 vibrates vertically, the spaces in the spaces a and b are electrically connected and the space c is Since it is electrically connected to the outside, the air in this portion does not become a load resistance, the air flow in the vicinity of the voice coil 25 is good, the effect of cooling the voice coil 25 is obtained, and the heat generation of the voice coil 25 is prevented. can do.

In this case, in this example, the lower damper 2
7 is made of a material having air permeability, so that the spaces a and b in the vicinity of the voice coil 25 and the space c between the damper 27 and the bottom plate 12 are brought into conduction with each other. It is possible to obtain the effect of preventing the generation of load resistance against the vibration and the effect of preventing the voice coil 25 from generating heat.

Therefore, the vibration of the coil bobbin 24 around which the voice coil 25 is wound (that is, the vibration of the diaphragm 20).
However, it is possible to secure good frequency characteristics as a speaker unit without being hindered by load resistance due to air, and to prevent an accident in which the voice coil 25 generates heat at a high temperature and damages the speaker unit.

Further, in this example, the through hole 11 for ventilation is used.
At the outlets of b, 12a, 15a, taper parts 11c, 12
Since b and 15b are provided, even if air flows in each through hole due to vibration of the voice coil 25, the air flow becomes smooth due to the action of the tapered portion, and wind noise can be prevented. Therefore, it is possible to prevent the generation of sound due to the air flowing through the ventilation holes, and to obtain a good speaker that does not generate abnormal noise other than the reproduced sound.

Although the lower damper 27 is made of a material having air permeability in the above-mentioned embodiment, even if the damper 27 is made of a material having no air permeability, a certain effect can be obtained.

Further, in the above-mentioned embodiment, the present invention is applied to the speaker unit having the double damper structure, but it is needless to say that the present invention can also be applied to a normal cone type speaker unit having one damper.

Further, in the above embodiment, the through holes 11b, 12
Although the detailed shape of the tapered portions a and 15a has not been particularly described, either a linear taper or a curved taper may be used as long as it can prevent the generation of wind noise.

[0025]

According to the present invention, the through hole formed in the top plate brings the air above and below the top plate near the voice coil into a conductive state, thereby reducing the load resistance due to the air and the heat generation amount of the voice coil. At the same time, the through hole formed in the bottom plate brings the outside of the speaker unit into conduction, and from this point as well, the load resistance due to air and the heat generation amount of the voice coil are reduced, and the sound reproduction characteristic as the speaker unit is improved. Become.

In this case, by applying to a speaker unit having a double damper structure in which dampers for swingably supporting a coil bobbin are arranged above and below the top plate, the air between the upper and lower dampers becomes conductive and double Even with a damper structure, the load resistance and the amount of heat generated by the voice coil decrease.
The sound reproduction characteristic of the speaker unit having the double damper structure is improved.

Further, at least one of the through hole of the top plate and the through hole of the bottom plate is provided with a predetermined taper portion or to prevent generation of wind noise when air passes through the through hole. It is possible to prevent the generation of abnormal noise due to the provision of the ventilation hole.

[Brief description of drawings]

FIG. 1 is a sectional view showing a speaker unit according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an example of a conventional speaker unit.

[Explanation of symbols]

 11 outer peripheral side top plate 11b through hole 12 bottom plate 12a through hole 13 magnet 14 inner peripheral side top plate 15 frame 20 diaphragm 21 cone 22 edge 23 center cap 24 coil bobbin 25 voice coil 26, 27 damper

Claims (3)

[Claims] 1. A frame, a diaphragm whose edge is supported by the frame, a voice coil wound around a coil bobbin attached to the diaphragm, and a magnetic circuit formed around the voice coil. In a speaker unit that reproduces sound corresponding to a signal by supplying a predetermined signal to the voice coil, a through hole is provided in a top plate that forms a joint between the magnetic circuit and the frame. A speaker unit characterized in that a through hole is provided in a bottom plate forming an end portion of the magnetic circuit on the side remote from the top plate. 2. The speaker unit according to claim 1, wherein dampers for swingably supporting the coil bobbins are arranged above and below the top plate. 3. The speaker unit according to claim 1, wherein a tapered portion is provided in at least one of the through hole of the top plate and the through hole of the bottom plate.