JP2003070095A - Dynamic speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means for realizing a high Young's modulus, light weight and appropriate loss with proper balance, even though the materials for diaphragms having high Young's modulus, light weight, and proper loss are contrary to each other. SOLUTION: A magnetic circuit of a reverse-dome speaker 1 is composed of a magnet 7, a yoke 8, and a plate 6, and a voice coil 15 is installed in a magnetic gap 4. An inverted-dome diaphragm 10 is made in a two-layered structure, having its reverse-surface side formed of a one-layer part 3a of a material with a large loss and its top-surface side formed of a two-layered part 3b of a material having a fast sound velocity, and a plurality of slits 13 are provided at positions on the circumference where a coin bobbin 12 is jointed. The coil bobbin 12 has a plurality of tongue pieces 14, formed and made to penetrate the plurality of slits 13 to join the inverted-dome diaphragm 10 and coil bobbin 12 on a radiation surface side by using an adhesive. Consequently the characteristics of both one layer and two layers can be utilized. The inverted- dome diaphragm 10 is held on a frame 5 via an edge 16 and the coil bobbin 12 is held via a damper 9.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art It is generally considered that a speaker diaphragm preferably has a large "sound velocity" and a large "loss". A high sound velocity requires a high Young's modulus and a light weight, and unless there is an appropriate loss, a sharp resonance is involved.

[0003]

However, in the conventional electrodynamic loudspeaker, the material of the diaphragm, which has a high Young's modulus, is light and has an appropriate loss, is an ideal material, but they are in conflict with each other. However, there is a problem in that it is necessary to devise a method for achieving a good balance between them.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an electrodynamic speaker having a diaphragm having a high Young's modulus, a light weight, and an appropriate loss.

[0005]

In order to solve the above problems, an electrodynamic speaker of the present invention has a voice coil 15 wound around a coil bobbin 12 in a magnetic gap 4 of an inner magnet type or an outer magnet type magnetic circuit. In the electrodynamic loudspeaker in which the coil bobbin 12 and the diaphragm 3 are installed, the back surface side of the diaphragm 3 is a one-layer portion 3a made of a material having a large loss, and the front surface side is a two-layer portion 3b made of a material having a high Young's modulus. It is a two-layer machine having the structure described below, and further, a plurality of slits 13 are provided at positions on the circumference where the coil bobbin 12 is joined,
Above the coil bobbin 12, these slits 1 are provided.
A plurality of tongue pieces 14 corresponding to 3 are formed, and a plurality of these tongue pieces 14 are passed through the plurality of slits 13,
It is characterized in that the diaphragm 3 and the coil bobbin 12 are bonded to each other by essentially bonding at least the two-layer portion 3b on the front surface side of the diaphragm 3 and the plurality of tongue pieces 14.

Further, the electrodynamic speaker of the present invention is characterized in that the diaphragm 3 is the inverted dome diaphragm 10.

Further, the electrodynamic speaker of the present invention is characterized in that the diaphragm 3 is the dome diaphragm 11.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The electrodynamic loudspeaker of the present invention uses a two-layered diaphragm having a structure in which a material with a large loss is on the back side and a material with a high Young's modulus is on the front side. Further, focusing on the joint surface between the coil bobbin and the diaphragm, in the case of the joint between the material surface having a lot of loss and the coil bobbin, the signal transmission from the voice coil tends to be absorbed without being faithfully transmitted. On the contrary, when the material surface having a high Young's modulus is joined to the coil bobbin, the air propagation surface (the surface of the speaker) can receive the signal transmission from the voice coil without loss. Therefore, the tongue at the upper end of the coil bobbin wound with a voice coil is passed through the slit of the two-layer diaphragm, and the two-layer portion of the diaphragm and the coil bobbin are joined together to make full use of the characteristics of both the first and second layers. I am trying to do it.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an inverted dome speaker that is a first embodiment of the present invention. Inverse dome speaker 1 in the embodiment
The outer magnet type magnetic circuit is composed of a magnet 7, a yoke 8 and a plate 6. A voice coil 15 wound around a coil bobbin 12 is installed in the magnetic gap 4 formed between the magnet 7 and the yoke 8.

The back side of the inverted dome diaphragm 10 is a single layer portion 3a made of a material having a large loss, and the front side is a double layer portion 3b made of a material having a large sound velocity. A plurality of slits 13 are provided at positions on the circumference to be joined. Further, a plurality of tongue pieces 14 corresponding to the above-mentioned plurality of slits 13 are formed on the upper part of the coil bobbin 12, and the plurality of tongue pieces 14 penetrate the plurality of slits 13 to form an inverted dome diaphragm. 10
The coil bobbin 12 and the coil bobbin 12 are bonded to each other on the radiation surface side (two-layer portion 3b) using an adhesive. Therefore, the single layer portion 3a,
Both characteristics of the two-layer portion 3b can be utilized.

It should be noted that the plurality of tongue pieces 14 are connected to the plurality of slits 1
It is an essential condition that the tongue piece 14 is penetrated through and the tongue piece 14 is joined on the radiation surface side (two-layer portion 3b) of the inverted dome diaphragm 10, but on the back surface side (single-layer portion 3a) of the inverted dome diaphragm 10, By applying an adhesive around the entire circumference in contact with the coil bobbin 12, the reverse dome diaphragm 10 and the coil bobbin 12 can be firmly joined, and moreover, the characteristics of both the single layer portion 3a and the double layer portion 3b can be utilized. You can

Although the diaphragm is joined to the coil bobbin 12 in the form of a dome having superior directivity, the inverted dome diaphragm 10 has an advantage that the coil bobbin 12 does not become long. The inverted dome diaphragm 10 is held on the frame 5 via the edge 16, and the coil bobbin 12 is held on the frame 5 via the damper 9.
The inverse dome diaphragm 10 and the coil bobbin 12 will be described in detail with reference to FIG.

FIG. 2 is a sectional view of a dome speaker which is a second embodiment of the present invention. The dome diaphragm 11 is used as the diaphragm of the dome speaker 2. Others are basically the same as those in FIG. 1, and therefore description thereof will be omitted.

3A and 3B are views for explaining a diaphragm used in the electrodynamic speaker of the present invention. FIG. 3A is a partial sectional view of the diaphragm, and FIG. 3B is a perspective view of the inverted dome diaphragm. c) is a perspective view of the dome diaphragm. "Sound velocity" on diaphragm 3
In order to increase the size of the material and to provide an appropriate "loss", a material with a large loss is made into a single layer portion 3a on the back surface side, and a material with a large sound velocity is made into a two-layer portion 3b on the front surface side. The paper making method was utilized. This is not made by pasting paper separately, but by the papermaking method,
This is a multi-layer structure by so-called multi-layer paper making without using an adhesive or the like.

That is, as the material of the single layer portion 3a,
Pulp with low bulk density, low beating and high loss can be used. Further, as the material of the two-layer portion 3b, a pulp having a high E (Young's modulus), a high beating degree pulp, a finely divided highly elastic fiber such as aramid, or a mixture of these with an inorganic filler is used. be able to.

The basis of the diaphragm 3 used in the electrodynamic speaker of the present invention is a "two-layer" structure made of different materials. The two-layer portion 3b on the front surface side of the diaphragm 3 is a thin layer, and the main component of the thickness of the diaphragm 3 is the one-layer portion 3a on the back surface side. It is obvious that the same effect can be obtained even if the one-sided portion 3a on the back surface side having the thickness is further composed of a plurality of layers and the structure is a [three-layer] or "four-layer" structure, and it is within the scope of the present invention. is there. Further, the inverted dome diaphragm 10 and the dome diaphragm 11
Is provided with a plurality of slits 13 at circumferential positions where the coil bobbin 12 is joined. In the example, the number of slits 13 is four, but of course the number is not limited.

FIG. 4 is a view for explaining a voice coil bobbin used in the electrodynamic speaker of the present invention. FIG. 4 (a) shows that both ends of the tongue of the voice coil bobbin are inclined,
(B) is rounded. A voice coil 15 is wound around a lower portion of the coil bobbin 12, and a plurality of tongue pieces 14 corresponding to the plurality of slits 13 are formed on an upper portion thereof. The plurality of tongue pieces 14 are for penetrating the plurality of slits 13 to join the diaphragm 3 and the coil bobbin 12. At this time, the plurality of tongue pieces 14 formed on the upper part of the coil bobbin 12 are provided with appropriate taper 14a and rounded 14b so as to facilitate penetration.

[0018]

As described above, in the electrodynamic speaker of the present invention, the voice coil 15 wound around the coil bobbin 12 in the magnetic gap 4 of the inner magnet type or the outer magnet type magnetic circuit.
In the electrodynamic speaker in which the coil bobbin 12 and the diaphragm 3 are joined, the back surface side of the diaphragm 3 is a one-layer portion 3a of a material having a large loss, and the front surface side is a two-layer portion of a material having a high Young's modulus. 3b is a two-layer papermaking structure, and further, a plurality of slits 13 are provided at circumferential positions where the coil bobbin 12 is joined, and the upper portion of the coil bobbin 12 corresponds to the plurality of slits 13. A plurality of tongues 14 are formed, and the plurality of tongues 14 are made to penetrate the plurality of slits 13 so that at least the diaphragm 3
Since the diaphragm 3 and the coil bobbin 12 are joined by essentially bonding the two-layer portion 3b on the front surface side and the plurality of tongues 14 to each other, it is possible to reproduce up to a high frequency range, and further, a flat frequency characteristic and a low distortion rate are obtained. realizable. Furthermore, the audio signal from the voice coil can be faithfully transmitted to the diaphragm.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an inverted dome speaker that is a first embodiment of the present invention.

FIG. 2 is a sectional view of a dome speaker that is a second embodiment of the present invention.

FIG. 3 is a diagram illustrating a diaphragm used in the electrodynamic speaker of the present invention, (a) is a partial cross-sectional view of the diaphragm,
(B) is a perspective view of an inverted dome diaphragm, (c) is a perspective view of a dome diaphragm.

4A and 4B are views for explaining a voice coil bobbin used in the electrodynamic speaker of the present invention, in which FIG. 4A is a shape in which both ends of a tongue piece of the voice coil bobbin are inclined, and FIG.

[Explanation of symbols]

1 Reverse dome speaker 2 dome speaker 3 diaphragm 3a One layer part 3b Double layer part 4 magnetic gap 5 frames 6 plates 7 magnet 8 York 9 damper 10 Reverse dome diaphragm 11 dome diaphragm 12 coil bobbins 13 slits 14 tongue 14a taper 14b are 15 voice coils 16 edges

Claims (3)

[Claims] 1. A voice coil (15) wound around a coil bobbin (12) is installed in a magnetic gap (4) of an inner magnet type or outer magnet type magnetic circuit, and the coil bobbin (12) is provided.
In the electrodynamic speaker in which the diaphragm and the diaphragm (3) are joined, the rear surface side of the diaphragm (3) is a single layer portion (3
a), and the surface side is a two-layer portion (3
b) is a two-layer papermaking structure, and further, a plurality of slits (13) are provided at circumferential positions where the coil bobbin (12) is joined, and these slits (13) are provided above the coil bobbin (12). A plurality of tongues (14) corresponding to the plurality of slits (13) are formed, and these plurality of tongues (14) are connected to a plurality of slits (13).
The vibrating plate (3) and the coil bobbin (12) are bonded to each other by making it essential to bond at least the two-layer portion (3b) on the front surface side of the vibrating plate (3) and the plurality of tongue pieces (14) by penetrating the vibrating plate (3) and the coil bobbin (12). An electrodynamic speaker characterized in that 2. The diaphragm (3) is an inverted dome diaphragm (10).
The electrodynamic speaker according to claim 1, wherein: 3. The electrodynamic speaker according to claim 1, wherein the diaphragm (3) is a dome diaphragm (11).