JP2000125392A - Double cone speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve directivity and diffusion effect for high frequencies in a full-range type double cone speaker. SOLUTION: A spherical or elliptic large cap 15a in concurrent use as a diffuser is adhered to a center position of a subcone 14a of, e.g. a parabolic shape that is bent inward with a smaller apex angle to improve the directivity of high-frequency radiation sound so as to diffuse the high-frequency components.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small-sized double-cone speaker, and more particularly to a double-cone speaker having a sub-cone with improved directional characteristics in a high frequency range.

[0002]

2. Description of the Related Art Conventionally, a double-cone speaker in which another small sub-cone is provided at the center of a diaphragm of a cone so as to handle reproduction of a high-pitched sound portion is, for example, 12c.
It is widely used in full-range speaker devices having a diameter of m to 25 cm.

FIG. 5 is a side sectional view of a conventional full-range small double-cone speaker having a sub-cone having a diameter of about 6.5 cm.

FIG. 5A shows a conventional double-cone type speaker as a whole. A yoke 3 has a disk-shaped portion made of a plate material such as pure iron, and a column-shaped speaker standing upright at the center of the disk-shaped portion. A center pole 3a and a magnet guide 3 having a stepped portion in a disk-shaped portion concentrically with the center pole 3a.
b is formed integrally.

[0005] A ring-shaped driving magnet 1 magnetized in the thickness direction of ferrite or the like is adhered on the disc-shaped portion of the yoke 3 via an adhesive. The inner diameter of the ring-shaped drive magnet 1 is fitted and positioned in a step portion of a magnet guide portion 3b formed in a disk-shaped portion of the yoke 3.

A plate 2 is placed on the driving magnet 1.
To join. In this case, the gap guide is left inserted in the center pole 3a, and an adhesive is applied to the upper surface of the driving magnet 1, and the inner diameter of the plate 2 is inserted into the outer diameter of the gap guide and fixed. Plate 2
Is a disc-shaped sheet made of pure iron or the like, and is a punched plate material having a through hole in the center, and a voice coil bobbin 8 is disposed in a magnetic gap 4 formed between the inner peripheral edge of the through hole and the outer diameter of the center pole 3a. Is established.

A metal part of a magnetic circuit is formed by fixing a frame 5 formed in a funnel shape with steel or the like to the plate 2.

A voice coil 9 wound around a cylindrical voice coil bobbin 8 is inserted into the magnetic gap 4 of the magnetic circuit, and the voice coil bobbin 8 is held via a damper 10 having a corrugation of a waveform so as to be able to swing up and down. I do.

An inner diameter portion of the damper 10 is joined to an intermediate portion of the voice coil bobbin 8 via an adhesive, and an outer diameter portion is joined to an outer periphery of a bottom portion of the frame 5. Further, the inner diameter of the funnel-shaped cone 7 having a free or fixed edge 6 made of paper or the like is joined to the outer diameter of the upper end of the voice coil bobbin 8, and the maximum diameter of the cone 7 is attached to the periphery of the upper opening of the frame 5 by a gasket. 11 is fixed. In addition, 12 is a kinshi wire, and 13 is an input terminal.

Further, a sub-cone 14 for reproducing high-pitched sound is joined to the outer diameter of the upper part of the voice coil bobbin 8 so as to form a double cone speaker.

The sub-cone 14 is, for example, coated with a synthetic resin liquid on a cloth or the like and cured in a funnel shape. The cap 15 is also molded into a dome shape with a cloth or the like, coated with the synthetic resin liquid and integrated with the sub-cone 14. At the top of the voice coil bobbin 8 via an adhesive.

[0012]

In the conventional double-cone speaker, two cones having different apical angles are provided, and the sub-cone 14 has a small apex angle 2θ ', a small vibration area, and a high-pitched sound. The apex angle 2θ of the cone 7 is large and the vibrating area is large, so that low sound is given to improve the high-frequency characteristics at the apex angle and the directional characteristics at the vibrating area, so Although a uniform frequency characteristic can be obtained, there is a problem that the directivity is not sufficiently improved at 30 ° and 60 ° as shown in the gain-frequency characteristic curve of FIG. .

FIG. 6 is a gain-frequency characteristic curve of the 6.5 cmφ double-cone speaker shown in FIG. 5, in which the horizontal axis indicates frequency (Hz) and the vertical axis indicates response (dB). Is significantly degraded from 4 KHz to 20 KHz compared to the front (0 °).

An object of the present invention is to provide a double-cone speaker in which the above-mentioned problems are solved, and a problem to be solved by the present invention is to provide a double-cone speaker having improved directional characteristics in a high frequency range. It is what we are trying to get.

[0015]

The double-cone speaker according to the present invention is a double-cone speaker A having a sub-cone 14a. The sub-cone 14a has a parabolic shape and a diffuser / cap 15a having a curved surface in the sub-cone 14a. It is arranged.

According to such a double-cone speaker, the high-frequency sound radiated from the inner surface of the sub-cone 14a is reflected by the inner surface of the diffuser / cap 15a and emitted from the small-diameter sub-cone 14, so that the directional characteristics in the high frequency range are greatly improved. Can be improved and the feeling of sound expansion can be improved.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a speaker according to the present invention will be described below with reference to FIGS. Parts corresponding to those of the speaker device shown in FIG. 5 are denoted by the same reference numerals, and redundant description is omitted.

FIG. 1 is a side sectional view of a double cone speaker of the present embodiment, and A is a small-diameter 6.5c as a whole of the present embodiment.
This shows a full-range double cone speaker of about mφ,
A magnetic circuit comprising a yoke 3, a magnet 1, and a plate 2, and a voice coil 9 wound around a voice coil bobbin 8 serving as a vibration system which is swingably inserted into a magnetic gap 4 formed between the center pole 3a and the plate 2. One of the outside diameters of the funnel-shaped cone 7 for bass having a vertical angle 2θ is a frame 5
And the other inner diameter of the cone 7 is fixed to the upper outer diameter of the voice coil bobbin 8, and the voice coil bobbin 8 swings each of the above-mentioned vibration systems up and down through a damper 10. It is movably held on the bottom of the frame 5. Each configuration described above is exactly the same as in FIG.

In this embodiment, since the shapes of the sub-cone 14a and the cap 15a constituting the double-cone speaker are different from those of FIG. 5, the sub-cone 14a and the caps 15 and 15a will be described with reference to FIG.

The sub-cone 14a used in this embodiment has the cap 15 and the sub-cone 14 described with reference to FIG. 5 integrally formed in a substantially parabolic shape with an apex angle of 2θ ′ <2θ. The material may be paper or a metal plate such as an aluminum plate similar to the funnel-shaped cone 7, a cloth coated with a synthetic resin, or the like. The bottom formed in a parabolic shape has a fold having the same size as the outer diameter of the voice coil bobbin 8. 16 is formed, and the top of the voice coil bobbin 8 is inserted into the fold 16 and joined via an adhesive.

In the above description, the case where the sub-cone 14a is formed parabolically has been described. The shape of this sub-cone is such that the cut surface of the hemisphere is directed upward in FIG. The shape may be such that the radiation opening of the sub-cone is reduced in diameter by cutting at the portion, and in effect, the curved surface of the sub-cone 14a is bent inward so that a relatively small opening 14b is provided. .

Further, a cap 15a which is also used as a diffuser
Is a hemisphere, a semi-ellipse, an ellipse, a cut surface cut at a position smaller than the maximum diameter to obtain a hemisphere or a semi-ellipse, a curved shape such as a cylinder having one opening and a dome portion on the other, and a subcone 14a formed parabolically. Is bonded to the center position with an adhesive or the like. The top of the diffuser / cap 15a is selected so as to project from the opening 14b of the sub-cone 14a. FIG. 1 shows a case where an elliptical sphere is bonded to the concave cap 15 with an adhesive.

According to the parabolic double-cone speaker having the above-described configuration, the directional characteristics of the high frequency band are improved, and the high frequency band is diffused by the diffuser which also serves as the cap.
You can get something that can greatly expand the sound.

That is, in operation, as shown in FIG. 1, the high-frequency radiation sound 17 radiated from the parabolic sub-cone 14a
Is the diffuser cap 15a and the bass cone 7
And reflected from the sub-cone 1
Since the light is radiated inside and outside 4a, the directional characteristic in the high frequency range is greatly improved like the 60 ° directional characteristic shown by the dotted line of the gain-frequency characteristic curve in FIG. Also, the diffuser cap 15a
As a result, the high range is diffused over the entire circumference, and the widening of the high range is improved.

FIG. 2 shows another side view of the double-cone speaker of the present invention. In FIG. 2, portions corresponding to those in FIG. 1
Only the differences will be described.

The double cone speaker A shown in FIG.
Is formed in a funnel shape such that the apex angle is 2θ, and a sub-cone 14a is provided with an apex angle of 2θ ′ <
It is formed of paper or the like integrally with the cone 7 in a substantially parabolic shape so as to obtain 2θ.

The funnel-shaped maximum diameter of the cone 7 is the edge 6
The inner diameter of the sub-cone 14a formed in a parabolic shape and fixed to the largest opening of the frame 5 with the gasket 11 is joined to the upper part of the voice coil bobbin 8 with an adhesive or the like.

Further, a cylindrical diffuser cap 15a having a dome-shaped top is joined to the top of the voice coil bobbin 8 with an adhesive. The diffuser / cap 15a can be selected to have a size such that it protrudes from the opening 14b of the sub-cone 14a, and the other configuration is exactly the same as that of FIG.

In the configuration of FIG. 2, high-frequency radiation 17 from the sub-cone 14a is reflected between the inner surface of the sub-cone 14a and the circumferential portion of the diffuser / cap 15a, and the high-frequency radiation is diffused through the diffuser / cap 15a. The directional characteristics in the high range are improved, and the high range can be diffused widely.

FIG. 3 is a side sectional view showing still another configuration of the double cone speaker A of the present embodiment. The same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and redundant description will be omitted. However, in FIG. 3, the sub-cone 14a is formed in a substantially funnel shape having a vertex angle 2θ ′ smaller than the vertex angle 2θ of the bass cone 7, and the sub-cone 14a is formed integrally with the cone 7.

The inner diameter of the sub-cone 14a is joined to the inner diameter of the voice coil bobbin 8, and the outer diameter of the cone 7 is the edge 6
The gasket 11 is engaged with the largest opening of the frame 5 via a through hole, and a diffuser cap 15a having the same structure as that shown in FIG. The diffuser cap 15a is a sub-cone 14a
Is selected so as to protrude from the opening 14b.

Further, if necessary, a dome-shaped second cap 18 is adhered inside the curved portion of the cone 7. Inside the top of the second cone 18 is a foam 18a such as urethane.
Is bonded with an adhesive to disperse the high frequency range, and a plurality of through holes 18b are formed around the dome of the second cap 18 to form a sub-cone 14
The radiated sound 17 in the high frequency range from a is diffused through the through holes 18b and dispersed in the high frequency range.
A double cone speaker capable of improving the directivity of 0 ° is obtained. According to this configuration, since the second cap 18 is bonded to the curved portion of the cone 7 with an adhesive, the strength at the curved portion can be increased, and the high range can be dispersed.
It is possible to increase the sense of expansion of the high frequency range with a small speaker of a full range type.

[0033]

According to the double cone loudspeaker of the present invention, the problem that the directivity is deteriorated in a small speaker of a full range type and the feeling of spreading in a high frequency range is eliminated is solved.
That is, the use of a curved, for example, parabolic sub-cone and a large cap (diffuser cap) significantly improves the high-frequency directivity (especially, 60 ° directivity), and greatly enhances the spread of high-frequency sound. Is obtained.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a double cone speaker of the present invention.

FIG. 2 is another side sectional view of the double cone speaker of the present invention.

FIG. 3 is still another side sectional view of the double cone speaker of the present invention.

FIG. 4 is a gain-frequency characteristic curve diagram of the double cone speaker of the present invention.

FIG. 5 is a side sectional view of a conventional double cone speaker.

FIG. 6 is a gain-frequency characteristic curve diagram of a conventional double cone speaker.

[Explanation of symbols]

A {speaker (double cone speaker), 7} cone, 14, 14a {sub cone, 14b} opening,
15 ‥‥ cap, 15a ‥‥ diffuser combined cap, 18 ‥‥ second cap, 18a ‥‥ foam, 18
b ‥‥ through hole

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takayuki Mizuuchi 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo F-term in Sony Corporation (reference) 5D012 DA02

Claims (3)

[Claims] 1. A double-cone speaker having a sub-cone, wherein the sub-cone has a parabolic shape, and a diffuser-cap having a curved surface is provided in the sub-cone. 2. The double-cone speaker according to claim 1, wherein the sub-cone is formed integrally with an intermediate cap. 3. The double-cone speaker according to claim 1, wherein the sub-cone is formed integrally with a cone of the double-cone speaker.