JPH08275291A - Damper for speaker - Google Patents

Abstract

PURPOSE: To attain partial thickened parts by obtaining a sufficient compliance and selecting properly the thickness by a metallic die. CONSTITUTION: One end of plural movable arms 9b, 9c bridged between an inner circumferential frame 9A to which a voice coil bobbin is inserted and an outer circumferential frame 9B of almost elliptic shape engaged with a speaker frame 8 is supported to an outer circumferential frame 9B at a position less than 45 deg. from the major axis direction of the outer circumferential frame 9B. Furthermore, a positioning groove 9a is formed to the outer circumferential frame 9B and engaged with a positioning projection 8b formed to a hold step 8a of the speaker frame 8 to make positioning and a butterfly damper 9 is made of a resin and formed integrally by the injection forming. A compliance of the same degree as a circular damper having a radius in matching with the length of the moving arms 9b, 9c with respect to the outer circumferential frame 9B is obtained. Even in the case of the butterfly damper 9 of an elliptic shape having difficulty in the positioning because of axial symmetry, the positioning with respect to the speaker frame 8 is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker damper suitable for an elliptical speaker unit.

[0002]

2. Description of the Related Art For example, a damper as a suspension for supporting a central portion of a diaphragm (cone) of a cone speaker unit is easy to move in the vibration direction of the cone together with a cone edge that supports the outer periphery of the cone.
It is shaped so as to have rigidity in the direction perpendicular to it.

Further, the damper prevents contact between the pole piece and the yoke on the side surface of the gap when the voice coil moves within the gap, and the cone paper and the cone paper are placed so that the voice coil is in a correct position in a stationary state. It also plays the role of holding the voice coil.

Therefore, in terms of performance, it affects the lowest resonance frequency f0 and has the same amplitude as the cone edge, so that it can follow any amplitude with moderate softness against the motion of the cone paper. , Materials and shapes that are sufficiently resistant to lateral movement are required.

By the way, such a damper includes a corrugation damper formed by impregnating cloth with a resin and heat-molding it,
There are thin bakelite plates and butterfly dampers made by punching out metal plates.

[0006]

By the way, in the damper for supporting the central portion side of the elliptical diaphragm (cone), the outer diameter of the damper is set in the minor axis direction of the elliptical diaphragm (cone). Therefore, it is difficult to obtain the required compliance because the diameter of the damper becomes small. Therefore, we are using soft materials and devising corrugation shapes to obtain the required compliance.

However, even if such a soft material is used or the corrugation shape is devised,
A circular damper in which the outer diameter of the damper is aligned with the minor axis direction of the elliptical diaphragm (cone) has a limit to obtain the necessary and sufficient compliance because the diameter is small as described above. Therefore, it is an obstacle to the extension of the low frequency range characteristic (f0).

The present invention has been made in view of the above circumstances, and provides a damper for a speaker capable of obtaining necessary and sufficient compliance when supporting an elliptical diaphragm (cone). With the goal.

[0009]

According to the first aspect of the present invention,
For a speaker including an inner peripheral frame into which a voice coil bobbin is inserted, a substantially elliptical outer peripheral frame engaged with a speaker frame, and a plurality of movable arms bridged between the inner peripheral frame and the outer peripheral frame The damper is characterized in that one end of the movable arm is supported by the outer peripheral frame at a position of less than 45 degrees when viewed from the major axis direction of the outer peripheral frame.

The invention according to claim 2 is characterized in that the outer peripheral frame is formed with positioning means for the speaker frame.

According to a third aspect of the present invention, the inner peripheral frame, the outer peripheral frame and the movable arm are made of resin and are integrally molded by injection molding.

[0012]

In the speaker damper of the present invention, one end of the plurality of movable arms bridged between the inner peripheral frame into which the voice coil bobbin is inserted and the substantially oval outer peripheral frame engaged with the speaker frame, Since it is configured to be supported by the outer peripheral frame at a position of less than 45 degrees when viewed from the major axis direction of the outer peripheral frame, it is possible to obtain the same degree of compliance as a circular damper having a radius corresponding to the length of the movable arm with respect to the outer peripheral frame. it can.

By the way, when the support of the movable arm with respect to the outer peripheral frame is set at a position exceeding 45 degrees, the movable arm is displaced in the minor axis direction of the substantially elliptical outer peripheral frame, and is commensurate with the length of the movable arm with respect to the outer peripheral frame. The compliance is the same as that of a circular damper having a large radius.

Further, since the positioning means for the speaker frame is formed on the outer peripheral frame, the positioning with respect to the speaker frame is facilitated even in the case of the line-symmetrical elliptical damper which is difficult to position.

Further, since the outer peripheral frame, the inner peripheral frame and the movable arm constituting the damper are made of resin and integrally molded by injection molding, the thickness of the material is limited like a damper formed by ordinary punching. The thickness of the damper is unique and it is difficult to obtain the required compliance, but the thickness can be set appropriately by the mold, so it is possible to partially thicken the wall thickness and ensure sufficient compliance. Is obtained.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 show an elliptical cone speaker unit according to an embodiment of the speaker damper of the present invention.

As shown in these figures, ring-shaped magnets 3 and 4 are fixed above and below the pole yoke 2 housed inside the magnetic circuit case 1. A ring-shaped plate 5 is fixed to the upper surface side of the magnet 4. Voice coil 7 wound around coil bobbin 6
Are arranged in the magnetic gap between the pole piece 2 a of the pole yoke 2 and the plate 5. The voice coil 7 is connected to the terminal 13 via the lead wire 14.

The coil bobbin 6 is an inner peripheral frame 9 of a butterfly damper 9.
It is inserted into A and elastically supported. The outer peripheral frame 9B of the butterfly damper 9 has an inner peripheral frame 9A through a plurality of movable arms 9b.
And is fixed to the hold step portion 8a on the inner surface of the speaker frame 8. Here, the butterfly damper 9 is made of resin and is injection-molded, and its inner peripheral frame 9A has a circular shape according to the shape of the coil bobbin 6,
The outer peripheral frame 9B is an elliptical diaphragm (cone) described later.
It has substantially the same shape as 10.

Further, as shown in FIG. 3, a positioning groove 9a is formed in the major axis direction of the outer peripheral frame 9B of the butterfly damper 9, and the position is formed in the hold step portion 8a of the speaker frame 8. The butterfly damper 9 is positioned with respect to the speaker frame 8 by being engaged with the projecting projection 8b. This makes the elliptical diaphragm (cone)
The supporting balance of the butterfly damper 9 with respect to 10 is maintained well.

That is, since a normal circular damper is point-symmetrical, positioning with respect to the speaker frame 8 is not necessary, but an elliptical butterfly damper 9 is line-symmetrical, and as shown in FIG. If the positioning protrusion 8b and the positioning groove 9a are not provided, it becomes difficult to position the butterfly damper 9, and the balance of support of the butterfly damper 9 with respect to the elliptical diaphragm (cone) 10 is lost. It will be.

A diaphragm (cone) 10 having one end fixed to the coil bobbin 6 and having an elliptical opening end side.
The cone edge 11 is fixed to the open end side of the speaker frame 8 via the gasket 12.

Next, the above-mentioned elliptical butterfly damper 9
The operation of will be described. First, FIG. 5 shows the details of the elliptical butterfly damper 9 described above. In FIG. 5, a total of eight movable arms 9 are provided between the inner peripheral frame 9A and the outer peripheral frame 9B.
The case where b and 9c are bridged is shown.

In the case of the butterfly damper 9 shown in the figure, the inner peripheral frame 9
A movable arm 9 bridged between A and the outer frame 9B
One end of each of b and 9c is supported at points A to A of the outer peripheral frame 9B. Further, since the butterfly damper 9 has a line-symmetrical shape, for example, the two lead lines a at an optimum angle θ (less than 45 degrees) formed by the center line a1 in the major axis direction.
The support balance of the butterfly damper 9 with respect to the diaphragm (cone) 10 even if the movable arm 9b on 2 (the tangent line of the support points a and mosquitoes) and a3 (the tangent line of the support points k and c) is not axisymmetric Is kept good. Similarly, even if the movable arm 9c on (the tangent line of the support points A and E) and (the tangent line of the support points C and D) is not made to be line-symmetrical, the diaphragm (cone) 10 is supported by the butterfly damper 9. Good balance is maintained.

By the way, as shown in FIG. 6, let us consider the case of a circular butterfly damper 20 having a normal point symmetry (in this example, a bridge between the inner peripheral frame 21 and the outer peripheral frame 22 is used). A total of six movable arms 23 supported by points A to F of the outer peripheral frame 22 are shown), for example, a lead line b2 (tangent line of support points A and D) and a lead line b3 (support point). The support balance cannot be maintained well unless each movable arm 23 has a line-symmetrical shape with respect to the lead-out line b1 located in the middle of the tangent line of (c) and (c).

Next, the supporting positions of supporting points A to C with the outer peripheral frame 22 in FIG. 5 will be examined. For convenience of explanation, FIG. 7 (a) shows only the supporting point a, and when the angle .theta. Of the leader line a2 with respect to the center line a1 in the major axis direction is less than 45 degrees, FIG. 7 (b). As shown in
It is possible to obtain the same level of compliance as a circular damper having a radius a. Therefore, in the case of the support point a inside the support point a, it is possible to obtain the same degree of compliance as that of the circular damper having a larger radius than the radius a.

By the way, as shown in FIG. 8A, the angle θ of the leader line a2 with respect to the center line a1 in the major axis direction is 45.
In the above case, as shown in FIG. 7B, the compliance is about the same as that of the circular damper having the radius b.
It can be seen that the compliance becomes smaller than that of the circular damper having the radius a shown in (b).

Furthermore, when injection molding the butterfly damper 9,
Since the end portions of the movable arms 9b and 9c supporting points A to C with the outer peripheral frame 22 in FIG. 5 are formed to be thicker than other portions (thickness uneven thickness), durability is increased. , It becomes easier to obtain the desired compliance,
Low range characteristics (f0 of an elliptical cone speaker unit)
) Is effective in extending.

As described above, in this embodiment, the inner peripheral frame 9A into which the voice coil bobbin is inserted and the speaker frame 8 are arranged.
One end of the plurality of movable arms 9b and 9c bridged between the outer peripheral frame 9B and the substantially elliptical outer peripheral frame 9B engaged with the outer peripheral frame 9B is supported by the outer peripheral frame 9B at a position less than 45 degrees as viewed from the major axis direction of the outer peripheral frame 9B. Since it is configured, the movable arm 9 with respect to the outer peripheral frame 9B
It is possible to obtain the same degree of compliance as a circular damper having a radius corresponding to the length of b and 9c.

That is, when the movable arms 9b and 9c are supported on the outer peripheral frame 9B at a position exceeding 45 degrees, the movable arms 9b and 9c are displaced toward the minor axis direction of the substantially elliptical outer peripheral frame 9B, and the movable arm 9b relative to the outer peripheral frame 9B. , 9c, the compliance is reduced to the same extent as a circular damper having a radius commensurate with the length.

Since the positioning groove 9a is formed on the outer peripheral frame 9B and the positioning projection 8b formed on the hold step portion 8a of the speaker frame 8 is engaged with the positioning groove 8a, the positioning is performed. Even in the case of the elliptical butterfly damper 9 whose positioning is difficult because of
Positioning with respect to the speaker frame 8 becomes easy.

Further, since the butterfly damper 9 is made of resin and is integrally molded by injection molding, the thickness of the damper is made unique by the limitation of the material thickness like a damper formed by ordinary punching. As compared with the case where it is difficult to obtain sufficient compliance, since the thickness can be appropriately set by the mold, it is possible to partially thicken the wall thickness, and sufficient compliance can be obtained.

[0032]

As described above, according to the speaker damper of the present invention, a bridge is provided between the inner peripheral frame into which the voice coil bobbin is inserted and the substantially elliptical outer peripheral frame engaged with the speaker frame. One end of the multiple movable arms
Since it is configured to be supported by the outer peripheral frame at a position of less than 45 degrees when viewed from the major axis direction of the outer peripheral frame, it is possible to obtain the same degree of compliance as a circular damper having a radius corresponding to the length of the movable arm with respect to the outer peripheral frame. it can.

Further, since the positioning means for the speaker frame is formed on the outer peripheral frame, the positioning with respect to the speaker frame becomes easy even in the case of the line-symmetrical elliptical damper, which is difficult to position.

Further, since the outer peripheral frame, the inner peripheral frame and the movable arm constituting the damper are made of resin and integrally molded by injection molding, the thickness of the material is limited like a damper formed by ordinary punching. The thickness of the damper is unique and it is difficult to obtain the required compliance, but the thickness can be set appropriately by the mold, so it is possible to partially thicken the wall thickness and ensure sufficient compliance. Can be obtained. Therefore, necessary and sufficient compliance can be obtained when supporting the elliptical diaphragm (cone).

[Brief description of drawings]

FIG. 1 is a half-cut sectional view showing an elliptical cone speaker unit according to an embodiment of a speaker damper of the present invention.

FIG. 2 is a perspective view showing the cone speaker unit of FIG.

FIG. 3 is a diagram for explaining a state of positioning a butterfly damper with respect to the speaker frame of the cone speaker unit of FIG.

FIG. 4 is a diagram for explaining positioning of butterfly dampers with respect to the speaker frame of the cone speaker unit of FIG.

5 is a plan view showing details of the butterfly damper shown in FIG. 1. FIG.

FIG. 6 is a plan view for explaining the operation of the butterfly damper shown in FIG.

FIG. 7 is a diagram for explaining the support position of each movable arm with respect to the outer peripheral frame in the butterfly damper of FIG.

8 is a view for explaining the action of the support position of each movable arm with respect to the outer peripheral frame in the butterfly damper of FIG.

[Explanation of symbols]

 2 pole yoke 3,4 magnet 5 plate 6 coil bobbin 7 voice coil 9 butterfly damper 8 speaker frame 8a hold step 8b positioning protrusion 9a positioning groove 9b, 9c movable arm 9A inner frame 9B outer frame 10 diaphragm (cone ) 11 cone edge

Claims (3)

[Claims] 1. An inner peripheral frame into which a voice coil bobbin is inserted, a substantially elliptical outer peripheral frame engaged with a speaker frame, and a plurality of movable arms bridged between the inner peripheral frame and the outer peripheral frame. A speaker damper comprising: the movable arm, wherein one end of the movable arm is supported by the outer peripheral frame at a position of less than 45 degrees when viewed from the major axis direction of the outer peripheral frame. 2. The speaker damper according to claim 1, wherein a positioning means for the speaker frame is formed on the outer peripheral frame. 3. The speaker damper according to claim 1, wherein the inner peripheral frame, the outer peripheral frame and the movable arm are made of resin and are integrally molded by injection molding.