JP3434384B2 - Speaker damper - Google Patents

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 in 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]

The invention according to claim 1 is
A voice coil support part for supporting the voice coil bobbin, a speaker frame attachment part provided outside the voice coil support part and attached to a speaker frame, and a bridge between the voice coil support part and the speaker frame attachment part. And a plurality of movable arms, wherein the speaker damper has a major axis direction and a minor axis direction, and the movable arm includes the speaker
Crosses the center line of the damper for power in the major axis direction.
That the angle formed by curved line of one end of the movable arm, characterized in that it is supported by the speaker frame mounting portion at a position of less than 45 degrees as viewed from the major axis direction.

According to a second aspect of the invention, there is provided the speaker damper according to the first aspect, wherein the speaker frame mounting portion is formed with positioning means for the speaker frame.

A third aspect of the present invention is the speaker damper according to the first or second aspect, wherein the voice coil support portion, the speaker frame mounting portion and the movable arm are made of resin and are integrally molded by injection molding. It is characterized by

[0012]

In the speaker damper of the present invention, the voice coil bobbin is inserted and the voice coil supporting portion for supporting the voice coil, the speaker frame attaching portion engaged with the speaker frame and attached, and the bridge therebetween are provided. It consists of multiple movable arms that are
For the center line of the speaker damper in the major axis direction
Are curved in line intersecting angles, since a structure for supporting the speaker frame mounting portion at one end a position of less than 45 degrees as viewed from the major axis direction of the damper speaker of that, taking the length of the movable arm longer As a result, it is possible to obtain the same degree of compliance as that of a circular damper having a radius corresponding to the length of the movable arm with respect to the speaker frame mounting portion serving as the outer peripheral frame of the speaker damper.

By the way, when the support of the movable arm to the speaker frame mounting portion is set at a position which exceeds 45 degrees as viewed from the longitudinal direction, the supporting portion is displaced in the minor axis direction of the substantially elliptical speaker damper, Since the movable arm cannot be made long, the compliance is reduced to the same extent as a circular damper having a radius corresponding to the length of the movable arm with respect to the speaker frame mounting portion.

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

Further, since the voice coil supporting portion, the speaker frame mounting portion and the movable arm which constitute the damper are made of resin and are integrally molded by injection molding, they are made of a material such as a damper formed by ordinary punching. The thickness of the damper is unique due to the limited thickness, and it is difficult to obtain the required compliance, whereas the thickness can be set appropriately by the mold, so partial thickness deviation is possible. Therefore, sufficient compliance can be 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. Then, a butterfly damper 9 which is a speaker damper
Includes an inner peripheral frame 9A which supports the voice coil 7 and serves as a voice coil supporting part, and an outer peripheral frame 9B which is mounted on the speaker frame 8 and serves as a speaker frame mounting part. The inner peripheral frame 9A and the outer peripheral frame 9B are A plurality of movable arms 9B are provided bridged in between.

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 action 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.

Further, 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, 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 integrally molded by injection molding, the thickness of the damper is made unique due to the limited thickness of the material, 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, the voice coil support portion into which the voice coil bobbin is inserted and the substantially elliptical speaker frame mounting portion to be engaged with the speaker frame are provided. A plurality of movable arms bridged in between are arranged in the major axis direction of the speaker damper.
Curved along a line intersecting the centerline
Form, one end of its, since a structure for supporting the speaker frame mounting portion at a position of less than 45 degrees as viewed from the major axis direction of the damper loudspeaker has a radius commensurate with the length of the movable arm with respect to the speaker frame mounting portion It is possible to obtain the same level of compliance as a circular damper.

Further, since the positioning means for the speaker frame is formed in the speaker frame mounting portion, the positioning with respect to the speaker frame is facilitated even in the case of a line-symmetrical damper which is difficult to position.

Further, since the speaker frame mounting portion, the voice coil supporting portion and the movable arm constituting the damper are made of resin and integrally molded by injection molding, the thickness of the material is the same as a damper formed by ordinary punching. The thickness of the damper is unique due to the limitation of, and it is difficult to obtain the required compliance, as compared with the one in which the thickness can be appropriately set by the mold, so it is possible to partially thicken the wall thickness. It is possible to obtain sufficient compliance. 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 plates 6 coil bobbins 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 Vibration plate (cone) 11 Cone edge

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Sho 60-142596 (JP, U) Shokai 58-54197 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04R 9/02 103 B29C 45/00 B29L 31:38

Claims (3)

(57) [Claims] 1. A voice coil support part for supporting a voice coil bobbin, a speaker frame attachment part provided outside the voice coil support part and attached to a speaker frame, the voice coil support part and the speaker frame attachment part. A speaker damper having a plurality of movable arms bridged between, wherein the speaker damper has a major axis direction and a minor axis direction,
The movable arm is in the major axis direction of the speaker damper.
Curved on a line that intersects the centerline at
Is formed, one end of the movable arm, speaker damper, characterized in that it is supported by the speaker frame mounting portion at a position of less than 45 degrees as viewed from the major axis direction. 2. The speaker damper according to claim 1, wherein the speaker frame mounting portion is formed with positioning means for the speaker frame. 3. The speaker damper according to claim 1, wherein the voice coil supporting portion, the speaker frame mounting portion and the movable arm are made of resin and are integrally molded by injection molding.