JP2003244790A - Speaker - Google Patents

Abstract

(57) [Summary] The present invention relates to a speaker used in various audiovisual equipment, and relates to an excellent speaker which suppresses rolling of a diaphragm of the speaker to improve sound pressure frequency characteristics. It can be provided. SOLUTION: In order to solve the above problem, a speaker according to the present invention has a shaft and an elastic disk 12 provided on a center pole 4, and the disk 12 is arranged on the inner periphery of a voice coil 7 to provide a voice. The purpose of the present invention is to improve the sound pressure frequency characteristics by suppressing the swinging of the coil 7 during the up and down movement, preventing the diaphragm 9 from rolling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker used in various audiovisual equipment.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to a side sectional view of a speaker shown in FIG.

In the figure, 1 is a magnet, 2 is an upper yoke provided on the upper surface of the magnet 1, 3 is a lower yoke provided on the lower surface of the magnet 1, 4 is a center pole continuous with the lower yoke 3, 5 is a magnetic gap between the inner peripheral surface of the upper yoke 2 and the outer peripheral surface of the center pole 4, 6 is a frame adhesively bonded to the upper surface of the upper yoke 2, and 7 is a coil portion arranged in the magnetic gap 5. A voice coil, 8 is a damper having an inner periphery fixed to the voice coil 7, and an outer periphery fixed to the frame 6, and 9 a vibration having an inner periphery fixed to the voice coil 7 and an outer periphery fixed to the frame 6 via an edge 10 described later. A plate 10 is an edge having an inner periphery fixed to the diaphragm 9 and an outer periphery fixed to the frame 6 (a magnetic circuit is formed by the magnet 1, the upper yoke 2, and the lower yoke 3 having the center pole 4). .).

The operation of the speaker configured as described above will be described below. When an electric current is passed through the coil portion wound around the voice coil 7, the electric current becomes orthogonal to the magnetic field in the magnetic air gap 5, and a force is generated in the directions perpendicular to the magnetic field and the electric current according to Fleming's law. At this time, the damper 8 and the edge 10 are the voice coil 7
Is supported so as to be concentric with the center pole 4, and when the diaphragm 9 vibrates, a force is applied so that the midpoint of the thickness direction of the upper yoke 2 and the midpoint of the coil winding width of the voice coil 7 are matched. Acting as a spring, the voice coil 7 and the diaphragm 9 vibrate while being supported by the damper 8 and the edge 10. As a result, the air is vibrated and compression waves are generated.
It sounds like a sound.

[0005]

However, in the above-described speaker configuration, the asymmetry of the supporting force of the damper 8 and the edge 10 and the asymmetry of the back pressure applied to the diaphragm 9 when the speaker is mounted on the speaker box and reproduced. Depending on the nature, the vibration system may not perform ideal piston movement and may cause a rolling phenomenon.

FIG. 10 is a diagram showing the movements of the diaphragm 9 and the voice coil 7 at the time of rolling, and as shown in the figure, the voice coil 7 comes into contact with the yokes 2 and 3 when this phenomenon occurs. In order to prevent the generation and damage of abnormal sound, the magnetic gap 5 is preliminarily provided widely.

The smaller the magnetic gap 5, the larger the magnetic flux density obtained, and the higher the efficiency is. However, the wider the gap, the lower the efficiency.

Furthermore, when a rolling phenomenon occurs at a specific frequency, the entire diaphragm 9 does not move in phase but partially in phase, as shown in FIG. Disturbance occurs.

Further, the force / displacement characteristic of the damper 8 (see FIG. 1)
As shown in 1), since the relationship between the force and the displacement of the damper 8 is not linear and also has hysteresis, harmonic distortion occurs in the sound pressure frequency characteristic.

An object of the present invention is to provide an excellent speaker that solves the above problems.

[0011]

In order to solve the above-mentioned problems, a speaker according to claim 1 of the present invention comprises a magnetic circuit having at least a center pole, and a frame coupled to the magnetic circuit. A speaker comprising a diaphragm whose outer circumference is connected to the frame via an edge and a voice coil integrated with the inner circumference of the diaphragm, the speaker being provided so as to vertically project from the center pole. And an elastic disc provided on the inner circumference of the voice coil mounted on the shaft. The elastic disc regulates the swinging of the voice coil when the voice coil moves up and down to prevent the vibration plate from rolling. It suppresses the occurrence of abnormal noise and damage to the voice coil.

According to a second aspect of the present invention, the shaft and the disc according to the first aspect are integrated with each other, and can contribute to reduction of the number of parts and improvement of workability.

According to a third aspect of the present invention, the disc according to the first aspect is supported by a shaft so as to be movable up and down, and the disc and the voice coil are integrally structured. It can contribute to reduction and improvement of workability.

According to a fourth aspect of the speaker of the present invention, the shaft according to the first aspect is supported by a center pole so as to be movable up and down, and the shaft, the disk and the voice coil are integrally structured. It can contribute to the reduction of the number of parts and the improvement of workability.

According to a fifth aspect of the speaker of the present invention, the disk according to the first aspect is supported on a shaft so as to be movable up and down, and the shaft is integrated with a center pole. It can contribute to the reduction of points and improvement of workability.

According to a sixth aspect of the speaker of the present invention, a protrusion is provided on the outer circumference of the disk according to the first, second or fifth aspect, and it is in sliding contact with the inner circumference of the voice coil. By providing a protrusion on the outer circumference of the disk, smooth sliding contact is performed as a guide for the voice coil to further reduce the possibility of obstacles.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a speaker of the present invention will be described below with reference to FIGS.

In the description, the same parts as those in the prior art will be designated by the same reference numerals and the description will be omitted.

(Embodiment 1) FIG. 1 is a side sectional view of an embodiment of a speaker of the present invention, and FIG. 2 (a) is a side sectional view of a disk which is a main part thereof, and FIG. FIG. 4B is a top view of the same, FIG. 3 is a sound pressure frequency characteristic and a third harmonic distortion characteristic diagram, and FIG. 4A is a side cross-sectional view of a shaft and a disk, which are main parts of the other development example. FIG. 4 (b) is a top view of the same, FIG. 5 (a) is a side sectional view of a voice coil and a disk, which are essential parts of the other development example, and FIG. 5 (b) is the same. It is a top view, FIG.6 (a) is a side sectional drawing of a voice coil, a disk, and a shaft which are the principal parts of the other development example, FIG.6 (b) is the same top view, and FIG.7 is the same. FIG. 9 is a side sectional view of a shaft and a center pole, which are main parts of another development example, and FIG. 8 is a side sectional view of a shaft, a center pole, and a disk, which are main parts of the other development example.

The difference from the prior art will be described with reference to FIG. 1. Numeral 11 is a shaft fixed on the center pole 4.
Reference numeral 12 is a disc fixed to the shaft and guiding the inner circumference of the voice coil 7, and is formed of a metal plate having a spring property or a resin having flexibility and being an elastic body.

As shown in FIG. 2, the disk 12 is composed of a ring-shaped outer circumference 12a, an inner circumference 12b adhered and fixed to the shaft 11, an outer circumference 12a, and an arm portion 12c extending along the inner circumference 12b.
The shape is also elastic.

By virtue of the structure in which the inner circumference of the voice coil 7 is guided by the disk 12, the vibration of the voice coil 7 due to the rolling phenomenon of the diaphragm 9 is suppressed, and abnormal noise is generated or damaged due to the vibration of the voice coil 7 when it moves up and down. And the disk 12 is made of an elastic body, the vibration of the voice coil 7 is suppressed while being suppressed.
The sound itself is prevented from being generated due to collision with the voice coil 7 and the magnetic gap 5 can be narrowed to improve the efficiency, and by removing the conventional damper, the acoustic characteristics of the damper can be improved. It can also be improved.

FIG. 3A shows the sound pressure frequency characteristics of the speaker of this embodiment, and it is confirmed that the sound pressure is improved even compared with the conventional case (B), and the sound pressure of the speaker of this embodiment is It was confirmed that the third harmonic distortion C was also lower than that of the conventional one (D).

FIGS. 4A to 9 show a main part of a development example of the present embodiment. According to FIG. 4, 13 is a disc 1
The disc 2a and the shaft 11a are integrally resin-molded to reduce the number of parts and improve workability in assembling into the speaker.

In the developed example of FIG. 5, the disk 13b and the voice coil 7a are integrally resin-molded to form the disk 14, and like the developed example of FIG. It is intended to improve the workability of incorporation.

In the development example of FIG. 6, the disk 13c, the voice coil 7b, and the shaft 11b are integrally resin-molded to form the disk 15, and the number of parts is further reduced and the workability of incorporation into the speaker is improved. It is intended to improve.

In the development example of FIG. 7, the shaft 11c and the center pole 4a of the lower yoke portion 3a are simultaneously formed of magnetic metal to form the lower yoke 16. Although the target is different, it is the same as the above-described development example. Moreover, the number of parts is reduced and the workability of assembling into the speaker is improved.

Further, in FIG. 8, the shaft 11d and the center pole 4b of the lower yoke portion 3b are simultaneously formed of magnetic metal to form the lower yoke 17, and a plurality of arc-shaped projections 13d are simultaneously formed integrally on the outer periphery. Since the disk 13e is also formed, the number of parts is reduced and the workability of assembling into the speaker is improved, and the plurality of protrusions 13d smoothly contact and slide the inner circumference of the voice coil 7 and the disk 13e. It can be done.

The shape of the disk 13e can be applied to the disk and the disk of this embodiment, and the same effect can be obtained with the voice coil 7.

As described above, in the present embodiment, the voice coil is supported without using the damper, so that the efficiency can be improved, the sound pressure frequency characteristic can be improved, and the distortion can be reduced as described above. Is.

In the present embodiment, the outer magnet type is used as the magnetic circuit. However, in the case of a speaker type using a voice coil and a diaphragm, an inner magnet type or a speaker of another known type magnetic circuit is used. It can also be applied in.

[0032]

As described above, the loudspeaker of the present invention suppresses the vibration of the voice coil when the voice coil moves up and down, controls the rolling of the diaphragm, and improves the sound pressure of the sound pressure frequency characteristic and has less distortion. It is possible to provide a speaker.

[Brief description of drawings]

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

FIG. 2 (a) is a side sectional view of a disk, which is the main part of the same. (B) Same top view

[FIG. 3] Same sound pressure frequency characteristic and third harmonic distortion characteristic diagram

FIG. 4 (a) is a side sectional view of a shaft and a disk, which are main parts of another development example, and FIG.

FIG. 5 (a) is a side sectional view of a voice coil and a disk, which are main parts of another example of development, and FIG.

FIG. 6A is a side sectional view of a voice coil, a disk, and a shaft, which are main parts of the other development example; FIG.

FIG. 7 is a side cross-sectional view of a shaft and a center pole, which are main parts of another example of development.

FIG. 8 is a side cross-sectional view of a shaft, a center pole, and a disk, which are main parts of another development example.

FIG. 9 is a side sectional view of a conventional speaker.

FIG. 10 is a side sectional view for explaining a state during the same operation.

FIG. 11 is a hysteresis characteristic diagram of the damper, which is the main part of the same.

[Explanation of symbols]

1 magnet 2 Upper yoke 3 Lower yoke 4 center pole 6 frames 7 voice coil 9 diaphragm 10 edges 11 axes 12, 13, 14, 15 disks 13d protrusion

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tsuyoshi Shimokawa             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Tetsuya Mohri             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Kazutaka Kubo             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 5D012 BB01 BB04 CA09

Claims (6)

[Claims] 1. A magnetic circuit having at least a center pole, a frame coupled to the magnetic circuit, a diaphragm having an outer periphery coupled to the frame via an edge, and a diaphragm integrated with an inner periphery of the diaphragm. A speaker including a voice coil, which is provided with a shaft provided so as to vertically project from the center pole, and an elastic disk provided on an inner circumference of the voice coil fixed to the shaft. 2. The speaker according to claim 1, wherein the shaft and the disk have an integrated structure. 3. The speaker according to claim 1, wherein the disk is supported by a shaft so as to be movable up and down, and the disk and the voice coil have an integral structure. 4. The speaker according to claim 1, wherein the shaft is supported by the center pole so as to be vertically movable, and the shaft, the disk, and the voice coil are integrally structured. 5. The speaker according to claim 1, wherein the disk is supported by a shaft so as to be vertically movable, and the shaft has a structure integral with the center pole. 6. The speaker according to claim 1, 2 or 5, wherein a protrusion is provided on the outer circumference of the disk.