JP2580251Y2 - Damper for speaker - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper for a loudspeaker, and more particularly to a damper for a loudspeaker having a small surface area and a large amplitude with respect to vibration.

[0002]

2. Description of the Related Art FIG. 5 shows a speaker disclosed in Japanese Utility Model Laid-Open Publication No. 59-180595. The speaker shown in FIG.
A yoke 1, a magnet 2 mounted on the yoke 1, a frame 4 fixed to the magnet 2 with a plate 3 interposed therebetween, a cone paper 5 supported by the frame 4, and a central portion of the cone paper 5 A voice coil 7 supported by the cone paper 5 via a bobbin 8 and placed in a magnetic circuit, and mounted on an outer peripheral surface of the bobbin 8 of the voice coil 7; And a corrugation damper 9 supported by the support member. The corrugation damper 9 is formed by concentrically connecting a plurality of corrugations. The corrugation damper 9 is designed to obtain a predetermined performance by increasing the outer diameter and reducing the stiffness of a low-tone speaker requiring a large amplitude.

Further, as a prior art of a speaker provided with a damper having a special shape and structure, for example, Japanese Unexamined Patent Publication No.
There is a technique described in Japanese Patent Publication No. 400.

That is, the damper described in Japanese Patent Application Laid-Open No. SHO 60-25400 has a short cylindrical upper end, a bellows-shaped upper telescopic part, and a short cylinder. A central joint formed in a shape, a lower elastic part formed in a bellows shape following the central joint, and a lower end formed in a short cylindrical shape following the central joint are integrally connected. Have been. Then, an outer peripheral edge of a diaphragm to which a voice coil is attached is joined to an inner surface of a central joint between the upper elastic part and the lower elastic part, and at least one of the upper end part and the lower end part is bonded to a frame. And fix it.

[0005]

The corrugation damper described in Japanese Utility Model Laid-Open Publication No. Sho 59-180595 and shown in FIG. 5 requires a large diameter for a low-tone speaker requiring a large amplitude. I have. However, when the outer diameter of the damper is increased, the surface area is inevitably increased, and when low-frequency sound is reproduced by a small-diameter speaker, the outer diameter of the damper and the outer diameter of the cone paper are almost the same. At this time, the sound is naturally radiated also from the damper, and its level is -30 to -40 dB as compared with the sound radiated from the cone paper, and the sound radiated from the damper is a factor that impairs the sound quality.

In addition, the damper described in the above-mentioned Japanese Patent Application Laid-Open No. 60-25400 has a problem that the stiffness cannot be reduced, and a desired performance cannot be obtained with a low-frequency speaker, and the structure is complicated. There is a problem that requires man-hours.

The present invention has been made in view of the above circumstances, and has as its object to provide a small surface area, a large amplitude, a simple structure, and a simple installation and support of a voice coil. It is an object of the present invention to provide a speaker damper.

[0008]

In order to achieve the above object, the present invention forms a frusto-conical first portion and a frusto-inverted conical second portion having the same central angle with each other. In the first and second portions, a plurality of fan-shaped notches are formed at equal intervals in the circumferential direction, the plurality of notches having gradually increasing intervals from the center in the radial direction toward the outside. Is integrally provided with a first collar for supporting the voice coil by being joined to a voice coil fixing ring, and is integrally provided with a second collar for being joined to the damper fixing ring on the second portion. It is a thing.

[0009]

According to the present invention, a frusto-conical first portion and a frusto-inverted conical second portion are integrally formed, and a sector-shaped notch is formed in the first and second portions. Are formed at equal intervals in the circumferential direction, so that the surface area can be reduced and a large amplitude with respect to vibration can be obtained.

Further, the present invention combines a first portion having a truncated cone shape and a second portion having a truncated inverted cone shape, and has a plurality of fan-shaped notches in the first and second portions. By simply forming and providing the first and second collars on the first and second parts, the structure is simple, so it can be manufactured with a small number of man-hours, and can be manufactured via the first and second collars. , The voice coil can be easily mounted, and can be accurately positioned and arranged in the magnetic circuit.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an embodiment of the damper of the present invention, and FIG. 2 supports a voice coil on the damper shown in FIG.
FIG. 3 is a longitudinal sectional view of a state in which the voice coil is arranged in a magnetic circuit, FIG. 3 is a plan view of FIG. 2, and FIG. 4 is a longitudinal sectional view of a speaker using the damper shown in FIG.

The damper 10 shown in FIGS.
As shown in FIG. 1, a frusto-conical first portion 11 and a frusto-inverted conical second portion 12 are integrally formed. The first and second portions 11 and 12 are formed at the same central angle.

A plurality of notches 13 are formed in the first and second portions 11 and 12 at equal intervals in the circumferential direction. As shown in FIG. 2, each notch 13 is formed in a fan shape whose interval gradually increases from the radial center of the first and second portions 11 and 12 to the outside.

A first collar 14 is integrally provided at the center of the first portion 11, and a second collar 12 is provided at the center of the first portion 11.
A second collar 15 is integrally provided at the center of the second collar 15. The inner diameter d ₁ of the first collar 14, the inner diameter d ₂ of the second collar 15 are formed in the same.

A ring 16 for fixing a voice coil is bonded and fixed to the inner periphery of the first collar 14, and the upper end of the bobbin 8 of the voice coil 7 is fixed to the inner periphery of the ring 16 by bonding. Have been. A ring 17 for damper fixing is adhered and fixed to the outer periphery of the second collar 15.

FIG. 4 shows a loudspeaker using the damper 10 of the above-described embodiment. The loudspeaker includes a yoke 1, a magnet 2 mounted thereon, and a plate 3 fixed thereto.
And a frame 4 fixed to the plate 3, a cone paper 5 supported by the frame 4, and a voice coil disposed in a magnetic circuit via a bobbin 8 supported at the center of the cone paper 5 7 and a damper 10 installed outside the bobbin 8. The damper 10 includes a ring 1 fixed inside a first collar 14.
6, and is fixed to the plate 3 via a ring 17 fixed to the outside of the second collar 15, and the voice coil 7 is It is positioned at a predetermined position in the circuit.

In this speaker, the amplitude required for the damper 10 can be set to any state by adjusting the angle θ ₁ shown in FIG. Also, damper 1
Notch 1 provided in first and second portions 11 and 12 of 0
A predetermined resonance frequency can be obtained by adjusting the stiffness with the angle θ ₃ shown in FIG. 3 determined by the number of the notches ₃ , that is, 360 ° / n, and the central angle θ ₂ of the notch 13 itself.

If the magnetic flux distribution in the air gap of the magnetic circuit is vertically symmetrical, the driving force generated in the voice coil 7 works equally up and down, and the amplitude becomes the same. However, if the damper supporting the voice coil 7 does not have a vertically symmetrical force-displacement characteristic, vibration with a good straight line cannot be obtained, which causes distortion. In this regard, in the damper 10 of this embodiment, the first and second portions 1 of the damper 10
The first and second collars 14 and 15 are formed at the same central angle to form a vertically symmetric slope.
Is formed so that d ₁ = d ₂ , so that good linearity can be obtained when the amplitude is large.

Further, when the voice coil 7 moves upward at the time of a large input, the outer diameter D of the damper 10 is set to the arrow A in FIG.
When the voice coil 7 moves downward, the outer diameter D moves in the direction of arrow B and the outer diameter D increases, so that the surface area of the damper 10 is reduced. It can handle large amplitudes.

When the same material is compared, the damper 1
Outer diameter D of about 1/3 of conventional corrugation damper
And the same stiffness can be obtained, and as a result, the sound radiated from the damper 10 can be reduced by 6 to 10 dB, so that good sound quality can be reproduced.

[0021]

As described above, according to the present invention, the first part of the truncated cone and the second part of the inverted truncated cone are formed by integrally combining the first part and the first part. In part 2,
Since a plurality of fan-shaped notches are formed at equal intervals in the circumferential direction, the surface area can be reduced, and a large amplitude can be obtained with respect to vibration.

Further, according to the present invention, the first part of the truncated cone and the second part of the inverted truncated cone are integrally combined, and the first and second parts are provided with a sector-shaped notch. It is possible to manufacture with a small number of man-hours by simply forming a plurality and providing the first and second collars in the first and second parts, and to simplify the structure. Through this, there is also an effect that the voice coil can be easily attached and accurately positioned and arranged in the magnetic circuit.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a state in which a voice coil is supported by a damper shown in FIG. 1 and the voice coil is arranged in a magnetic circuit.

FIG. 3 is a plan view of FIG. 2;

4 is a longitudinal sectional view of a speaker using the damper shown in FIG.

FIG. 5 is a longitudinal sectional view of a speaker showing a conventional technique.

[Explanation of symbols]

 7 voice coil 8 bobbin of voice coil 10 damper 11 first part of damper 12 second part of damper 13 notch 14 first color 15 second color 16 ring for fixing voice coil 17 ring for fixing damper

Claims (1)

(57) [Scope of request for utility model registration] 1. A first frusto-conical shape having the same central angle with respect to each other.
Part (11) and a truncated inverted conical second part (12) are integrally formed, and the first and second parts (11), (1) are formed integrally.
In 2), a plurality of fan-shaped cutouts (13) are formed at regular intervals in the circumferential direction, with a gradually increasing distance from the center in the radial direction toward the outside, and the first portion (11) is formed. A first collar (14) for supporting the voice coil (7) by being joined to the voice coil fixing ring (16) is integrally provided, and the second part (12) is provided with a damper fixing ring. A damper for a speaker, wherein a second collar (15) joined to (17) is provided integrally.