JPH07284190A - Speaker - Google Patents

Abstract

PURPOSE:To enable the reproduction of clear and delicate high sound quality by having a constitution that a highly stretched PEN film in which a specified alumina film is formed is used for a sub-cone by being molded into a desired shape. CONSTITUTION:A frame 3 is coupled on the upper surface of a magnetic circuit where a magnetic gap is formed. The outer peripheral part of a diaphragm 2 coupled with a voice coil 8 to be fitted into the magnetic gap as a center is coupled with the peripheral part of this frame 3. A highly stretched PEN film in which a reticular or hexagonal alumina film of film thickness of 5Angstrom to 1000Angstrom is formed at least one side of the upper surface of the voice coil 8 is coupled with a sub-cone 1 molded into a desired shape. In this case, the magnetic circuit where the magnetic gap is formed by laminating and coupling a ring-shaped lower part plate 6 having a center pole part, a ring-shaped magnet 4 and a ring-shaped upper part plate 5 is composed.

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 audio equipment.

[0002]

2. Description of the Related Art A conventional speaker will be described with reference to the drawings.

FIG. 8 is a front half sectional view showing the structure of a conventional speaker. In FIG. 8, 17 is a lower plate having a center pole portion, 18 is a ring-shaped magnet, and 1 is a ring-shaped magnet.
Reference numeral 9 denotes a ring-shaped upper plate, which is laminated and combined to form a magnetic circuit in which a magnetic gap is formed.

Reference numeral 20 denotes a frame coupled to the upper surface of the magnetic circuit, 21 denotes a diaphragm having an outer peripheral portion coupled to the peripheral edge of the frame 20, 22 is coupled to the center of the diaphragm 21 and to the magnetic gap. A voice coil fitted without eccentricity, 23 is a gasket joined to the periphery of the frame 20 together with the outer peripheral portion of the diaphragm 21, 24 is a damper for supporting the voice coil 22, and 25 is a central portion of the diaphragm 21. It is a dust cap joined to the upper surface.

Further, instead of the dust cap 25,
There was also a configuration in which conical sub-cones were combined for the purpose of reproducing high frequencies.

Further, the sub cone and the dust cap 2
5 or when a resin material is used for the bobbin material around which the coil of the voice coil 22 is wound, a polyethylene naphthalate film (hereinafter, referred to as P hereinafter) composed of naphthalenedicarboxylic acid and ethylene glycol is used for the purpose of achieving high reliability and low distortion.
The EN film) was molded into a desired shape and used.

[0007]

However, since the subcone, the dust cap 25 and the bobbin made of the above-mentioned conventional PEN film are polymer films, they can be easily formed into a dome shape or a cylindrical shape with good productivity and are inexpensive. It has a feature that it can be supplied in a large amount, but it has a smaller stiffness and lacks rigidity compared to metal diaphragms such as aluminum and titanium and bobbins, so it is easy to reproduce low frequencies, but the sound reproduction band is narrow, so it is a film. When the thickness is made thin, distortion occurs, and there are drawbacks such that the speaker's input resistance side is easy to flicker. In addition, there is a problem in that high-quality sound cannot be reproduced because of lack of rigidity even in high-frequency reproduction.

The present invention solves such conventional problems,
An object of the present invention is to provide a speaker using a subcone, a dust cap, or a bobbin made of a resin material, which has excellent performance and can reproduce high-quality sound.

[0009]

In order to solve the above problems, a speaker according to the present invention has a voice coil in which a frame is coupled to the upper surface of a magnetic circuit having a magnetic gap and the periphery of the frame is fitted in the magnetic gap. A highly stretched PE formed by connecting the outer peripheral portions of the vibration plate connected to each other at the center, and forming a mesh-like or hexagonal alumina film having a film thickness of 5Å to 1000Å on at least one surface on the upper surface of the voice coil.
This is a structure in which sub-cones formed by molding an N film into a desired shape are combined.

[0010]

With this configuration, since the highly stretched PEN film is used as the base material of the sub-cone, the rigidity is increased,
The speed of sound as a material is improved.

Further, by coating the surface of the film with an alumina film in a mesh or hexagonal pattern, the sputter-coated alumina film is not a uniform film, but a film of a mesh to hexagonal pattern with cracks or gaps is formed on the film surface. Since it is formed, a hard alumina film can be formed without impairing the moldability into a dome shape, so that the rigidity is further increased while increasing the internal loss, and it is possible to reproduce with higher sound quality.

[0012]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a front half sectional view showing the structure of the speaker according to the embodiment. In FIG. 1, 6 is a lower plate having a center pole portion, 4 is a ring-shaped magnet, and 5 is a ring-shaped upper plate. And a magnetic circuit in which a magnetic gap is formed by stacking and coupling these is formed.

3 is a frame coupled to the upper surface of the magnetic circuit, 8 is a voice coil fitted in the magnetic gap without being eccentric, and 2 is coupled around the voice coil 8 and the outer peripheral portion is the frame 3 The diaphragm 9 coupled to the periphery of the frame 3 and the outer peripheral portion of the diaphragm 2 are connected to the frame 3
A gasket 7 is connected to the peripheral edge of the voice coil 7, a damper 7 supports the voice coil 8, and a subcone 1 is connected to the upper surface of the voice coil 8.

FIG. 2 is a cross-sectional view showing the subcone 1, which is a polyethylene naphthalate film (hereinafter referred to as PEN) composed of naphthalenedicarboxylic acid and ethylene glycol.
(Referred to as a film) is a highly stretched PEN film 11 on one side of which a substrate having an alumina film 12 having a thickness of about 50Å is formed by a reactive sputtering method at a molding temperature of 210 ° C. for a molding time of 15 seconds. Sub cone 1
It is molded into.

The physical properties of the base material having the alumina film 12 formed on one surface of the PEN film 11 are shown in Table 1 in comparison with those of the conventional PEN film.

[0017]

[Table 1]

As is clear from this (Table 1), the base material made of the PEN film 11 on which the alumina film 12 according to the present invention is formed has a higher sound velocity than the conventional PEN film.
It can be seen that both internal loss has improved significantly.

Further, the alumina film 12 whose surface is coated with aluminum in an oxygen atmosphere by a reactive sputtering method has a mesh structure as shown in FIG. 3 in which the surface condition is enlarged. Is relaxed in the mesh-shaped or turtle-shaped gaps of the hard alumina film 12, and does not greatly affect the moldability. Further, there are many gaps in the hard alumina film 12, and it is considered that this effect causes a large internal loss.

Therefore, the sub-cone 1 used in the speaker of the present invention has a high internal loss due to the high rigidity of the PEN film as the base material and the alumina film 12 having the mesh or hexagonal coating layer formed on the surface thereof. The speaker of the present invention having the structure and using the sub-cone 1 has an improved high-frequency reproduction limit frequency and can realize a delicate and clear sound quality.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a front half sectional view showing the structure of the speaker according to the present embodiment. In FIG. 4, 6 is a lower plate having a center pole portion, 4 is a ring-shaped magnet, and 5 is a ring-shaped upper plate. And a magnetic circuit in which a magnetic gap is formed by stacking and coupling these is formed.

3 is a frame coupled to the upper surface of the magnetic circuit, 8 is a voice coil fitted in the magnetic gap without being eccentric, and 2 is coupled around the voice coil 8 and the outer peripheral portion is the frame 3 The diaphragm 9 coupled to the periphery of the frame 3 and the outer peripheral portion of the diaphragm 2 are connected to the frame 3
The reference numeral 7 is a gasket connected to the peripheral edge of the diaphragm, 7 is a damper for supporting the voice coil 8, and 10 is a dust cap connected to the upper surface of the central portion of the diaphragm 2.

FIG. 5 is a cross-sectional view showing the dust cap 10, which is the same as that of the above-mentioned embodiment 1 in which the alumina film 14 having a thickness of about 50 Å is formed on one surface of the highly stretched PEN film 13 by the reactive sputtering method. The base material is molded into a dust cap 10 having a desired shape shown in the same figure at a molding temperature of 210 ° C. and a molding time of 15 seconds, and the physical properties of the base material are the same as those in the above (Table 1).

Further, the surface state of the alumina film 14, which has been surface-coated with aluminum by a reactive sputtering method in an oxygen atmosphere, has a mesh structure.
Therefore, the elongation of the film at the time of molding is relaxed by the mesh-shaped or hexagonal gaps of the hard alumina film 14, and the moldability is not greatly affected. Further, there are many gaps in the hard alumina film 14, and it is considered that this effect causes a large internal loss.

Therefore, the dust cap 10 used in the loudspeaker of the present invention has a high internal loss due to the high rigidity of the PEN film 13 as the base material and the alumina film 14 having the mesh or hexagonal coating layer formed on the surface thereof. The speaker of the present invention using the dust cap 10 has an improved high-frequency reproduction limit frequency, and can realize a delicate and clear sound quality.

(Embodiment 3) A third embodiment of the present invention will be described below with reference to the drawings.

FIG. 6 is a front half sectional view showing the structure of the speaker according to the embodiment. In FIG. 6, 6 is a lower plate having a center pole portion, 4 is a ring-shaped magnet, and 5 is a ring-shaped upper plate. And a magnetic circuit in which a magnetic gap is formed by stacking and coupling these is formed.

3 is a frame coupled to the upper surface of the magnetic circuit, 8 is a voice coil fitted in the magnetic gap without being eccentric, and 2 is coupled around the voice coil 8 and the outer peripheral portion is the frame 3 The diaphragm 9 coupled to the periphery of the frame 3 and the outer peripheral portion of the diaphragm 2 are connected to the frame 3
A gasket 7 is attached to the peripheral edge of the voice coil 7, a damper 7 supports the voice coil 8, and a dust cap 10 is attached to the upper surface of the voice coil 8.

FIG. 7 is a cross-sectional view showing the bobbin 8a forming the voice coil 8. One side of the highly stretched PEN film 15 has a thickness of about 5 by a reactive sputtering method.
The same base material as in Example 1 having the 0Å alumina film 16 formed thereon was molded into a cylindrical shape and molded into a bobbin 8a having a desired shape. The physical property values of the base material are those shown in Table 1 above. Is the same.

Further, the surface of the alumina film 16 coated with aluminum by a reactive sputtering method in an oxygen atmosphere has a mesh-like surface state. Therefore, the elongation at the time of molding the film is a hard alumina film 1.
It is relaxed in the mesh-shaped or hexagonal gaps of 6, and does not have a great influence on the moldability. Further, it is considered that there are many gaps in the hard alumina film 16 and this effect causes a large internal loss.

Therefore, the voice coil bobbin 8a used in the loudspeaker of the present invention has the rigidity of the PEN film 15 as the base material and the alumina film 16 having the mesh or hexagonal coating layer formed on the surface thereof. The structure of the present invention has a high internal loss, and the speaker of the present invention using the bobbin 8a has an improved high-frequency reproduction limit frequency and can realize a delicate and clear sound quality.

[0033]

As described above, the speaker according to the present invention is
By using a highly-stretched PEN film, which is formed on a sub-cone, dust cap, or bobbin, on at least one side of which a 5Å to 1000Å film thickness of a mesh or hexagonal alumina film is formed and used. ,
The rigidity is increased, the sound velocity is improved, and the internal loss is increased.
You will be able to play clear and delicate high-quality sound.

Furthermore, by forming an alumina film on the surface of the base material, it is possible to reduce the rate of change of physical properties due to special environments such as heat resistance and weather resistance, so that it can be used not only indoors but also outdoors. It can also be used for applications such as automobiles and vehicles, and is of great industrial value because it can be mass-produced at low cost.

[Brief description of drawings]

FIG. 1 is a front half sectional view showing a configuration of a speaker according to a first embodiment of the present invention.

FIG. 2 is a front sectional view showing a configuration of a sub cone used for the speaker according to the embodiment.

FIG. 3 is an enlarged view of the surface of the sub-cone base material according to the embodiment.

FIG. 4 is a front half cross-sectional view showing the configuration of a speaker according to a second embodiment of the present invention.

FIG. 5 is a front sectional view showing the structure of a dust cap used for the speaker according to the embodiment.

FIG. 6 is a front half sectional view showing the configuration of a speaker according to a third embodiment of the present invention.

FIG. 7 is a front sectional view showing the structure of a bobbin for a voice coil used in the speaker according to the same embodiment.

FIG. 8 is a front half-sectional view showing the configuration of a conventional speaker.

[Explanation of symbols]

 1 Sub Cone 2 Vibration Plate 3 Frame 4 Magnet 5 Upper Plate 6 Lower Plate 7 Damper 8 Voice Coil 8a Bobbin 9 Gasket 10 Dust Cap 11,13,15 PEN Film 12,14,16 Alumina Film

Claims (3)

[Claims] 1. A voice coil, wherein a frame is coupled to an upper surface of a magnetic circuit having a magnetic gap, and an outer peripheral portion of a diaphragm coupled around a voice coil fitted in the magnetic gap is coupled to a peripheral edge of the frame. A highly-stretched polyethylene naphthalate film composed of highly stretched naphthalenedicarboxylic acid and ethylene glycol was formed into a desired shape on at least one side of which a mesh-like or hexagonal alumina film having a film thickness of 5Å to 1000Å was formed. A speaker that combines sub-cones. 2. A frame is coupled to an upper surface of a magnetic circuit having a magnetic gap, and an outer peripheral portion of a diaphragm coupled around a voice coil fitted in the magnetic gap is coupled to a peripheral edge of the frame. Highly stretched naphthalene dicarboxylic acid and ethylene glycol on the upper surface of the central part of the polyethylene naphthalate film with a film thickness of 5Å ~ 1000Å on at least one side A speaker that combines molded dust caps. 3. A frame is coupled to an upper surface of a magnetic circuit having a magnetic gap, and an outer peripheral portion of a diaphragm coupled around a voice coil fitted in the magnetic gap is coupled to a peripheral edge of the frame, and the voice is formed. A bobbin material with a coil wound around it is formed of a highly stretched polyethylene naphthalate film consisting of naphthalene dicarboxylic acid and ethylene glycol, and a mesh or hexagonal alumina film with a thickness of 5Å to 1000Å formed on at least one side of the film. A speaker molded into a cylindrical shape.