JPH09187095A - Speaker system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reproduction acoustic sound quality and also to improve the directive characteristics of a speaker system without increasing the device constitution nor causing the difficult device structure by securing the different crossover resonance frequency levels among the parts of a diaphragm. SOLUTION: The cone paper 1 and 2 are separated into the 1st and 2nd parts of almost semicircular shapes which are arrayed via the radial boundaries set around the center parts of both paper 1 and 2 near a voice coil 8. Then the paper 1 and 2 have different crossover resonance frequency levels. For this purpose, the paper 1 and 2 are set at different weight, different thickness or different Young's moduli or use the different materials or the pulp of different degrees of beating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a speaker device for converting an electric signal into sound.

[0002]

2. Description of the Related Art Conventionally, a voice circuit has a magnetic circuit, a voice coil movably arranged in a magnetic gap of the magnetic circuit, and a diaphragm attached to the voice coil. A speaker device has been proposed which converts an electric signal supplied to a coil into a sound generated by the vibration of the diaphragm.

Such a speaker device is called a conductive type speaker. In this conductive speaker device,
When the voice coil is supplied with an electric signal, the voice coil moves in the magnetic flux in the magnetic gap together with the diaphragm, and vibrates the diaphragm.

As shown in FIG. 19, the cone paper which is the vibrating plate is formed of a material having a uniform thickness such as paper and having a shape of a peripheral surface of a cone. An opening 105 is formed in the center of the cone paper 101.

As shown in FIGS. 20 and 21, the voice coil has a cone paper 10 which is the vibrating plate via a cylindrical bobbin made of an insulating material.
It is attached to the central part of 1. This voice coil 1
04 is wound around the outer peripheral surface of the bobbin. That is, the voice coil 104 has a front end attached to the rear surface of the central portion of the cone paper 101. The voice coil 104 is in a state of being protruded rearward from the cone paper 101.

The cone paper 101 has an outer peripheral edge portion supported by a frame of a magnetic circuit portion via an edge 102 having flexibility, and the voice coil 104 is positioned in a magnetic gap of the magnetic circuit portion. Let

The cone paper 10 of the conventional speaker device
In some examples, as shown in FIG. 22, an annular paper partially lacking is used, and both sides of the missing portion are joined to each other by a margin 106 to form a conical shape.
This cone paper also has a substantially uniform thickness as a whole.

[0008]

By the way, in order to improve the sound quality of reproduced sound in the speaker device as described above, particularly in the case of a small speaker device,
It is conceivable to reduce the weight and the rigidity of the cone paper 101. Further, in order to improve the sound quality, it is possible to make the magnetic force generated by the magnetic circuit stronger.

However, any of these measures leads to an increase in the size of the speaker device and a difficulty in manufacturing.

Further, in the speaker device as described above, it is difficult to improve the directional characteristics. This directional characteristic indicates the degree of deterioration of the sound quality when the reproduced sound is heard at a position outside the front position of the speaker device.
That is, in the above speaker device, it is difficult to radiate sound of good sound quality over a wide angle range centered on the speaker device.

Therefore, the present invention has been proposed in view of the above-mentioned circumstances, and improves the sound quality of reproduced sound and the directional characteristic without causing an increase in the size of the device and a difficulty in manufacturing. The present invention is intended to solve the problem of providing a speaker device in which

[0012]

In order to solve the above problems, a speaker device according to the present invention has a diaphragm, a voice coil attached to the central portion of the diaphragm, and a magnetic gap portion. A magnetic circuit for locating the voice coil in a magnetic gap portion, and the diaphragm is divided into a plurality of portions arranged with radial boundaries centered on a central portion of the diaphragm. The respective divided resonance frequencies are different from each other.

Also, the speaker device according to the present invention has a diaphragm, a voice coil attached to the central portion of the diaphragm, and a magnetic gap portion, and the voice coil is positioned in the magnetic gap portion. The diaphragm includes a magnetic circuit, and the diaphragm has a plurality of divided portions that are discretely arranged. The divided resonance frequencies of the respective portions are different from each other, and the portions are symmetrical about the central portion of the diaphragm. The divided resonance frequencies are different at different positions.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the speaker device according to the present invention comprises a magnetic circuit and a frame 6 disposed on the magnetic circuit.

The magnetic circuit has a disk-shaped yoke 11 made of a magnetic material, and an annular magnet 10 fixedly arranged on the front surface of the yoke 11. At the center of the front surface of the yoke 11, a cylindrical center pole portion 13 is integrally provided so as to project. The center pole portion 13 is coaxial with the magnet 10 and is inserted into the central through hole portion of the magnet 10.

A disk-shaped plate 9 having a through hole at the center thereof is attached to the front surface of the magnet 10 by a magnetic material. The tip side portion of the center pole portion 13 is inserted into the through hole in the central portion of the plate 9. The inner peripheral surface of the through hole in the central portion of the plate 9 and the outer peripheral surface of the tip side portion of the center pole portion 13 face each other to form a magnetic gap 16.

The frame 6 is formed of a material having sufficient rigidity such as metal into a cylindrical shape whose front end side is expanded in a substantially conical shape, and its rear end side portion is fixed to the front surface portion of the plate 9. ing.

To the holding portion on the front end side of the frame 6, the peripheral portions of the cone papers 1 and 2 serving as a vibration plate are attached by a gasket 4 via an edge 3. The edge 3 is formed to have flexibility and is displaceable in the front-rear direction.

The cone papers 1 and 2 are composed of a substantially cone-shaped cone portion and a dome-shaped cap 5 attached to the cone portion so as to close the through hole in the central portion of the cone portion. Has been done. The peripheral portion of the cone portion is joined to the edge 3.

A bobbin is attached to the central portions of the cone papers 1 and 2 facing rearward. This bobbin is formed in a cylindrical shape, and its front end is attached to the center of the cone papers 1 and 2.

It is desirable that this bobbin should have a light weight while having high rigidity. Therefore, this bobbin is a bakelite board, paper or cloth impregnated with epoxy resin,
It is desirable to form a synthetic resin material such as a glass-epoxy plate (a glass fiber material solidified with an epoxy resin) into a cylindrical shape. Further, this bobbin may be formed of a metal plate, paper, or the like.

A voice coil 8 is adhered to the outer peripheral surface of the bobbin. This voice coil 8
It has a tinsel wire (lead wire) 14 and is wound into a cylindrical shape. The tinsel wire 14 is the frame 6
Is connected to an input terminal 15 provided via a support member.

The voice coil 8 is located in the magnetic gap 16. That is, the voice coil 8 is coaxial with the center pole portion 13 and is inserted between the center pole portion 13 and the inner surface of the through hole in the central portion of the plate 9.

The front end side portion of the bobbin is connected to and supported by the rear end side portion of the frame 6 through a damper 7 having flexibility and vibration absorption.

By the way, the cone papers 1 and 2 are shown in FIG.
As shown in FIG. 2, a plurality of portions arranged via radial boundaries centered on the central portions of the cone papers 1 and 2 in the vicinity of the voice coil 8, that is, the first portions each having a substantially semicircular shape. It is divided into a cone paper 1 and a second cone 2. The cone papers 1 and 2 are different from each other in division resonance frequency. Differentiating the respective cone papers 1 and 2 from each other with different division resonance frequencies means changing their weights, changing thicknesses, changing Young's moduli, or different materials or pulps having different beating degrees. It can be realized by forming.

Further, as shown in FIG. 11, the cone paper has three portions arranged with radial boundaries centered on the central portion of the cone paper, that is, one portion each.
First to third substantially fan-shaped semicircles having an opening angle of 20 °
It may be divided into the cone papers 1, 2 and 37.

Further, as shown in FIG. 12, the cone paper has four portions arranged via radial boundaries centered on the central portion of the cone paper, that is, each has an opening angle of 90 °. First to fourth substantially fan-shaped semicircles
It may be divided into the cone papers 1, 2, 37 and 38.

As shown in FIG. 13, the cone paper has a plurality of divided portions 2, 37, 38, 39 discretely arranged in a circular region 1 serving as a base. The parts may have different divided resonance frequencies. At this time, in the cone paper, the divided resonance frequencies are different from each other at symmetrical positions with respect to the center of the cone paper. That is, the divided portions having the same divided resonance frequency are not formed at symmetrical positions with the central portion of the cone paper as the center.

Such cone papers 1 and 2 can be prepared by the following steps. That is, first,
The pulp used as the material for the cone paper is beaten with a beater to obtain a desired beating degree. At this time, the cone papers 1, 2 or the divided portions 37, 38, 39
Pulps having various beating degrees corresponding to the above are prepared in advance. The beating degree may be the same for each of the cone papers 1, 2 or each of the divided portions 37, 38, 39.

When different materials or different kinds of pulp are mixed with the pulp, the different materials or different kinds of pulp are mixed in the beater or pulp tank after beating the pulp with a beater. .

The above pulp is mixed with a dye and a sizing agent to form a pulp solution having a concentration such that papermaking can be performed.

Next, as shown in FIGS. 2 and 9, pulp 23 is placed on a wire net 18 (or punching) whose central portion is bulged downward from the pulp tank (not shown) like a cone paper. , 25 are piled up. This wire net 18
Has a peripheral edge supported by a support frame 19. At this time, as shown by an arrow A in FIG. 2, the pulp 23, 25 is sucked by a vacuum pump from the back side (lower side) of the wire netting 18 to adsorb the pulp 23, 25 to the wire netting 18. At the same time, the water in the pulp 23, 25 is dehydrated.

The suction path of the vacuum pump is such that the area that becomes the first cone paper 1 and the second cone paper 2
The area is divided into. And the wire mesh 1
As shown in FIG. 9, the reference numeral 8 is supported by the support beams 34 at the portions corresponding to the boundaries between the above regions. This support beam 34
Has an upper portion sharpened in a knife-edge shape so that the contact area with the wire net 18 is small.

Then, as to the area to be the first cone paper 1, as shown by an arrow E in FIG.
It is sucked through the through hole 35 of the inner frame provided in the inside 9.
Further, as for the area to be the second cone paper 2, as shown by arrows F and G in FIG.
Sucked through 6,36. By changing the size of these through holes 35, 36,
The suction force can be changed with respect to each other.

Since the suction powers are different in the areas to be the cone papers 1 and 2, the amounts of the pulps 23 and 25 accumulated in these areas are different from each other as shown in FIG. In this way, each of the above cone papers 1,
Even when the beating degrees of these pulps are equal to each other, the cone papers 1 and 2 have different weights from each other and the divided resonance frequency is different even if the beating degrees of these pulps are equal to each other. Are formed as different cone papers.

These pulps 23 and 25 are the same as the wire mesh 18 described above.
Are in contact with each other via a radial boundary centered on the central part of the. At the boundaries, the pulps 23 and 25 are intertwined with each other in a wet state.

The above pulps 23 and 25 are shown in FIG.
As shown in FIG.
It is heated to about 0 ° C. and pressed by the molding die 29. The molding die 29 has a conical protrusion 30 corresponding to the shape of the wire netting 18. As shown by an arrow D in FIG. 4, the molding die 29 fits the protrusions 30 into the recesses formed by the wire netting 18 so as to cooperate with the wire netting 18 and the pulps 23, 2 described above.
5 is sandwiched and pressed. At this time, each of the above pulps 23, 2
At the boundary, the fibers 5 are joined to each other while entwining the fibers of each other.

Pulp 23, which becomes the above-mentioned cone papers 1 and 2,
When the amount of 25 is different from each other and the weight and the thickness are different from each other, when pressure is applied by the molding die 29, the pressure is increased in the region where the amount of pulp is high and the density and Young The rate increases.

The pulps 23 and 25 are shown in FIG.
As shown in FIG. 3, it is formed substantially as the cone paper. The cone paper has a peripheral portion 31 and a central portion 32.
Are cut off to form cone papers 1 and 2 having a predetermined shape as shown in FIG.

As shown in FIG.
The edge 3 is bonded as shown in FIG. 16 and the gasket 4 is bonded as shown in FIGS.

Further, the above cone paper is prepared as described above.
Three parts consisting of the first to third cone papers 1, 2 and 37, and the first to fourth cone papers 1, 2, 37,
In the case where the wire net 18 is formed as having four parts composed of 38 or a plurality of divided parts 2, 37, 38, 39 which are discretely arranged, the wire mesh 18 is divided into these divided parts in the same manner as in the above step. It may be divided according to the portion and sucked by the vacuum pump.

Also in these cases, the cone paper is formed such that the divided portions have different weights and Young's moduli. Further, in the case where each of the above-mentioned divided parts is formed by making paper with different materials or pulps with different beating degrees, the pulp is supplied from the pulp tank onto the wire netting 18 for each material or each pulp. In this case, each material or pulp is deposited only in a corresponding predetermined area by masking the wire mesh 18 at this time.

In the cone paper of this speaker device, the protrusions 30 of the molding die 29 are provided with irregularities corresponding to the respective regions, and the pressure applied to the respective regions is made different, whereby the respective regions are also made different. Young's modulus in can be different from each other.

Further, as shown in FIGS. 14 and 15, the cone paper of this speaker device is composed of a plurality of fan-shaped contact pieces 40, and is projected to one side from each of the contact pieces 40. The glue margin piece 42 may be configured to be adhered to the other side portion 41 of the adjacent contact piece 40.

In this case, since the weight of the portion to which the adhesive margin piece 42 is adhered is large, the division resonance frequency is different from that of the other portions. As shown in FIG. 15, the portions to which the glue margin pieces 42 are bonded are arranged radially around the central portion of the cone paper.

[0047]

EXAMPLE A speaker device according to the present invention having the above-described structure was prepared, and as shown in FIG.
As shown in FIG. 17, the frequency characteristic over 0000 Hz was measured for the front (0 °) characteristic, the 30 ° characteristic, and the 60 ° characteristic.

The frequency characteristic of this speaker device is shown in FIG.
Frequency characteristics of the conventional speaker device shown in Fig.
0 ° characteristic and 60 ° characteristic). This conventional speaker device has the same configuration as the speaker device according to the present invention except that the cone paper is formed of a uniform material.

The frequency characteristics of the speaker device according to the present invention are, as shown in FIGS. 18 and 23, less resonance than the conventional speaker device in the frequency characteristics of about 5000 Hz to 10000 Hz, and the front characteristic, 30
The sound quality and the directional characteristic are improved in that the ° characteristic and the 60 ° characteristic are close to each other.

[0050]

As described above, in the speaker device according to the present invention, the diaphragm is divided into a plurality of parts arranged through radial boundaries centered on the central part of the diaphragm. The divided resonance frequencies of the diaphragms are different from each other, or the diaphragm has a plurality of divided portions arranged discretely, and the divided resonance frequencies of the divided portions are different from each other. Since the divided resonance frequencies are different from each other at symmetrical positions around the center, resonance is reduced, sound quality is improved, and directional characteristics are improved.

That is, the present invention can provide a speaker device in which the sound quality of reproduced sound and the directional characteristics are improved without inviting an increase in the size of the device and a difficulty in manufacturing. is there.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of a speaker device according to the present invention.

FIG. 2 is a vertical sectional view showing a first manufacturing process of the cone paper of the speaker device.

FIG. 3 is a vertical cross-sectional view showing a second manufacturing process of the cone paper of the speaker device.

FIG. 4 is a vertical cross-sectional view showing a third manufacturing process of the cone paper of the speaker device.

FIG. 5 is a vertical cross-sectional view showing the shape of cone paper of the speaker device.

FIG. 6 is a vertical cross-sectional view showing the shapes of the cone paper and the main part of the edge of the speaker device.

FIG. 7 is a vertical cross-sectional view showing the shapes of cone paper and edges of the speaker device.

FIG. 8 is a perspective view showing the shapes of cone paper and edges of the speaker device.

FIG. 9 is a vertical cross-sectional view showing a configuration of a main part of a wire net forming the cone paper of the speaker device.

FIG. 10 is a front view showing a configuration of cone paper of the speaker device.

FIG. 11 is a front view showing another example of the configuration of the cone paper of the speaker device.

FIG. 12 is a front view showing still another example of the configuration of the cone paper of the speaker device.

FIG. 13 is a front view showing an example in which divided portions are discretely arranged on the cone paper of the speaker device.

FIG. 14 is a development view of the cone paper when the cone paper of the speaker device is formed by pasting.

FIG. 15 is a front view showing a cone paper of the speaker device configured by laminating.

FIG. 16 is a vertical cross-sectional view showing the shapes of cone paper and edges of the speaker device.

FIG. 17 is a side view showing the measurement conditions of directional characteristics in the speaker device.

FIG. 18 is a graph showing frequency characteristics of the speaker device.

FIG. 19 is a vertical cross-sectional view showing a configuration of cone paper and an edge of a conventional speaker device.

FIG. 20 is a perspective view showing a configuration of cone paper and an edge of a conventional speaker device.

FIG. 21 is a front view showing a configuration of cone paper and an edge of a conventional speaker device.

FIG. 22 is a front view showing another example of the configuration of the cone paper of the conventional speaker device.

FIG. 23 is a graph showing frequency characteristics of a conventional speaker device.

[Explanation of symbols]

 1 1st cone paper 2 2nd cone paper 5 Cap 8 Voice coil 9 Plate 10 Magnet 11 Yoke 13 Center pole part 16 Magnetic gap part 37,38,39 Divided part

Claims (2)

[Claims] 1. A vibrating plate, a voice coil attached to a central portion of the vibrating plate, and a magnetic circuit having a magnetic gap part, wherein the voice coil is located in the magnetic gap part. The diaphragm is divided into a plurality of parts arranged with radial boundaries centered on the central part of the diaphragm, and these respective parts have different divided resonance frequencies. . 2. A vibrating plate, a voice coil attached to a central portion of the vibrating plate, and a magnetic circuit having a magnetic gap part, wherein the voice coil is located in the magnetic gap part. The diaphragm has a plurality of divided parts that are discretely arranged.These parts have different divided resonance frequencies, and the divided resonance frequencies are located at symmetrical positions about the center of the diaphragm. Speaker devices that are different from each other.