JP2006094087A - Damper for speaker and speaker employing it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a damper for a speaker and the speaker employing it in which contradictory performances of ensuring linearity in amplitude displacement for a small input signal and amplitude limitation for a large input signal can be realized at a lower manufacturing cost. <P>SOLUTION: The damper for the speaker comprises an inner circumferential portion being boded to a voice coil bobbin, an outer circumferential portion being boded to a frame, and a movable supporting portion composed of a circumferential corrugation for connecting the inner circumferential portion and the outer circumferential portion. Corrugation at the movable supporting portion has a plurality of cuts. The cut has a circumferential width decreasing gradually in the radial direction from the inner circumferential side toward the outer circumferential side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a damper used for a speaker for sound reproduction, and a speaker using the damper.

  The damper for the speaker supports the vibration system including the diaphragm and the voice coil bobbin at a predetermined position, and in order to enable good vibration, the inner periphery is joined to the voice coil bobbin, and the outer periphery is a frame or It joins to a magnetic circuit etc. and a support movable part connects an inner peripheral part and an outer peripheral part. In conventional dampers, many corrugation dampers with concentric corrugated corrugations are used as the support movable part. Manufactured by heat molding with a mold.

As for the shape and material of the corrugation damper, since various contradictory performances such as ensuring linearity of amplitude displacement with respect to a small input signal and amplitude limitation with respect to a large input signal are required, various studies have been conventionally made. For example, there are those that change the weave density of the woven fabric between the inner peripheral side and the outer peripheral side of the support movable part of the damper, and those that change the concentration of the resin (Patent Document 1). Moreover, there is a corrugation damper in which a small hole is provided in a portion where stress is concentrated at the time of vibration of the support movable portion of the damper (Patent Document 2), and a corrugation damper in which a cutout portion is provided in the radial direction (radial direction) in the support support movable portion of the damper. (Patent Document 3).

JP-A-8-1111897 (FIG. 1) Japanese Utility Model Publication No.59-33393 (FIG. 3) JP 61-114699 A (FIGS. 1 and 2)

  However, none of the prior art dampers is sufficient. When changing the weaving density of the woven fabric between the inner and outer perimeters of the damper support movable part, a special woven fabric is required for each caliber in order to accommodate speakers with different calibers. Is a problem. Further, when a small hole or a notch is provided in the support movable part of the damper, there is a problem that it is difficult to specify a place where stress is concentrated and to specify the position and size of the notch.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention relates to a speaker damper and a speaker using the same, and to ensure linearity of amplitude displacement with respect to a small input signal, and An object of the present invention is to provide a speaker damper and a speaker that are compatible with the contradictory performance of limiting the amplitude with respect to a large input signal and that are inexpensive to manufacture.

  The damper for a speaker according to the present invention includes an inner peripheral portion that is bonded to the voice coil bobbin, an outer peripheral portion that is bonded to the frame, and a support movable portion that is formed of a circumferential corrugation that connects the inner peripheral portion and the outer peripheral portion. The corrugation of the support movable portion includes a plurality of cutout holes, and the circumferential width of the cutout holes decreases in the radial direction from the inner peripheral side to the outer peripheral side.

  Preferably, in the speaker damper of the present invention, the corrugation cutout hole of the support movable portion is triangular or trapezoidal.

  Preferably, in the speaker damper of the present invention, the corrugation notch hole of the support movable portion has two points (A) and (B) defined on the concentric circle of the corrugation, and other radius larger than the concentric circle. A first line connecting point (A) and point (B) with respect to point (C) defined as the intersection of a concentric circle and a perpendicular bisector of a straight line connecting two points (A) and (B) (AB), a second line (AC) connecting points (A) and (C), and a third line (BC) connecting points (B) and (C).

  Preferably, in the speaker damper of the present invention, the corrugation cutout holes of the support movable portion are concentrically arranged at four positions at intervals of 90 degrees from the center.

  Preferably, the speaker of the present invention includes any of the speaker dampers of the present invention.

  The operation of the present invention will be described below.

  The damper for a speaker according to the present invention is a damper in which the movable support portion is formed of a circumferential corrugation, and is a support movable portion that connects an inner peripheral portion joined to the voice coil bobbin and an outer peripheral portion joined to the frame. The corrugation has a plurality of cutout holes. The corrugation of the support movable part is displaced with the vibration of the vibration system of the speaker such as the voice coil bobbin, and the circumferential corrugation is divided by providing the notch holes, so the support between the notch holes is supported. In other words, the movable portion constitutes a support arm, and it is possible to secure linearity of amplitude displacement with respect to a small input signal and limit amplitude with respect to a large input signal.

  Specifically, in the speaker damper according to the present invention, the circumferential width of the cutout hole decreases as it extends from the inner peripheral side to the outer peripheral side in the radial direction. In other words, the corrugation of the support movable part of the speaker damper does not have a simple round, elliptical, or track-shaped cutout, but the width of the cutout hole seen in the circumferential direction such as a triangle or trapezoid in the radial direction. A plurality of notch holes having a shape that becomes narrower from the peripheral side to the outer peripheral side and that has a triangular base or a long side of the trapezoid on the inner peripheral side are provided. Therefore, the support movable part between the plurality of cutout holes constituting the support arm is, as compared to the case where the width of the cutout hole in the circumferential direction is constant, the width on the inner peripheral side is narrower, and as it goes to the outer peripheral side. Because it becomes wider, only the inner circumference side vibrates for small input signals, so the thin support arm improves the linearity of amplitude displacement, and for large input signals up to the outer circumference side. Since it comes to vibrate, the so-called thick support arm can limit the amplitude. As a result, the speaker including the speaker damper of the present invention is excellent in sound quality and durability.

  Preferably, the shape of the corrugation notch hole of the support movable portion is defined based on three points on the corrugation. The three points are a straight line connecting two points (A) and (B) defined on the corrugation concentric circle, another concentric circle having a radius larger than the concentric circle, and the two points (A) and (B). This is the point (C) defined as the intersection with the perpendicular bisector. For these three points that form an isosceles triangle when they are connected, a first line (AB) that connects points (A) and (B) and a second line that connects points (A) and (C) ( AC) and the third line (BC) connecting points (B) and (C) define the shape of the notch hole. In other words, the circumferential width of the cutout hole, which is the distance between the second line (AC) and the third line (BC), is changed from the inner peripheral side (first line side) to the outer peripheral side (point (C)) in the radial direction. ). Therefore, a speaker damper having excellent linearity of amplitude displacement and amplitude limiting property is provided.

  Preferably, the first line (AB) connecting the point (A) and the point (B) may be a straight line or an arc along the circumference of the corrugation. Further, the second line (AC) connecting the points (A) and (C) and the third line (BC) connecting the points (B) and (C) may each be a straight line. Therefore, since a notch hole can be provided by simple post-processing for an existing corrugation damper, it is possible to obtain a speaker damper having excellent amplitude displacement linearity and amplitude limitability at a low manufacturing cost. Can do.

  Preferably, in the speaker damper of the present invention, the corrugation cutout holes of the support movable portion are concentrically arranged at four positions at intervals of 90 degrees from the center. When the base material constituting the support movable portion is a woven fabric in which a plurality of warp yarns and weft yarns are substantially orthogonal, the support movable portion constituting so-called four support arms formed between four cutout holes. In addition to the shape change of corrugation, linearity of amplitude displacement is realized by extending a stitch formed of warp and weft of the woven fabric of the base material. Therefore, the damper for a speaker according to the present invention changes the amplitude displacement by changing the angle at which the four cutout holes are provided between 0 degrees and 90 degrees with respect to the warp and weft angles of the woven fabric of the base material. A speaker damper having excellent linearity and amplitude limitability can be obtained.

  The speaker damper of the present invention can achieve both contradictory performances such as ensuring linearity of amplitude displacement with respect to a small input signal and limiting the amplitude with respect to a large input signal, and a speaker damper with low manufacturing cost, and the same A speaker using can be provided.

  The damper for the speaker of the present invention and the speaker using the same are connected to the inner peripheral part where the damper is joined to the voice coil bobbin, the outer peripheral part joined to the frame, the inner peripheral part and the outer peripheral part. And a support movable part composed of a circumferential corrugation, wherein the corrugation of the support movable part is provided with a plurality of cutout holes, and the circumferential width of the cutout holes is changed from the inner peripheral side to the outer peripheral side in the radial direction. It was realized by making it decrease as it reached.

  Hereinafter, although the damper for speakers by the preferred embodiment of the present invention and the speaker using the same are explained, the present invention is not limited to these embodiments.

  FIG. 1 is a plan view illustrating a speaker damper 1 according to a preferred embodiment of the present invention. The speaker damper 1 has a prepreg impregnated with a phenol resin on a woven fabric in which a plurality of warps and wefts of cotton and polyester fibers are substantially orthogonal, and is heat-molded with a mold to cut an inner periphery and an outer periphery. It is a damper that is formed. The speaker damper 1 includes an inner peripheral portion 2 having a plane that joins a voice coil bobbin (not shown), an outer peripheral portion 3 that has a plane that joins a frame (not shown), an inner peripheral portion 2, and an outer peripheral portion 3. The corrugation 4 of the support movable part is provided with four notch holes 5a, 5b, 5c and 5d. In this embodiment, the four cutout holes 5a, 5b, 5c and 5d are arranged concentrically at intervals of 90 degrees from the center O, and each has the same shape.

  The woven fabric of the base material of the speaker damper 1 is knitted so that a plurality of warp yarns are in the X-axis direction, a plurality of weft yarns are in the Y-axis direction, and these are substantially perpendicular to each other. , Schematically shows the direction of the weave of the woven fabric. The four cutout holes 5a, 5b, 5c, and 5d are concentrically arranged at an interval of 90 degrees from the center O. In this embodiment, for example, the first cutout hole 5a has a cutout from the center O. A straight line L connecting the holes 5a is disposed in a direction having a relationship of approximately 45 degrees with respect to the X axis and the Y axis, and the other cutout holes 5b, 5c, and 5d are 90 degrees from the center O in a concentric order. Are arranged at intervals.

  The shape of one notch hole 5a is defined based on three points (A), (B) and (C) on the corrugation 4. The point (A) and the point (B) are defined on a concentric circle 6 of the corrugation 4, and the point (C) is another concentric circle 7 having a larger radius than the concentric circle 6 and two points (A) and (B). Is defined as an intersection with a straight bisector L of a straight line connecting. That is, these three points (A), (B), and (C) are in an isosceles triangle relationship when connected. The perpendicular bisector L is also a straight line passing through a point O that defines the center of the speaker damper 1. The shape of the cutout hole 5a includes a first line (AB) connecting the points (A) and (B), a second line (AC) connecting the points (A) and (C), and a point (B ) And a third line (BC) connecting the points (C). Specifically, the first line (AB) is an arc along the concentric circle 6 on the corrugation 4, and the second line (AC) and the third line (BC) are straight lines. Therefore, the width w of the notch hole 11 decreases as the circumferential width w increases from the inner circumference 2 side to the outer circumference 3 side in the radial direction, and the overall shape is generally a triangle. Note that the three points (A), (B), and (C) indicate positions on the corrugation 4, and do not indicate the structure of a specific portion of the corrugation 4.

  The four cutout holes 5a, 5b, 5c, and 5d each have a circumferential width w that decreases in the radial direction from the inner circumference 2 side to the outer circumference 3 side. The width on the inner circumference 2 side is narrower and the width on the outer circumference 3 side is wider than when the circumferential width of the hole is constant. That is, due to the four cutout holes, the portion of the corrugation remaining between the cutout holes forms a support arm having a narrow width on the inner peripheral side and wider toward the outer peripheral side. As a result, in the speaker damper 1, the thin support arm improves the linearity of the amplitude displacement for small input signals, while the thick support arm limits the amplitude for large input signals. Add. The speaker damper 1 according to the present invention can achieve two performances that are likely to conflict with each other due to the shape of the cutout hole 5.

  FIG. 2 is a characteristic diagram illustrating a displacement characteristic with respect to a load for the speaker damper. 2A shows measured values of the speaker damper 1 of the first embodiment, FIG. 2B shows measured values of the speaker damper 11 of Comparative Example 1, and FIG. 2C shows the speaker of Comparative Example 2. It is a measured value of the damper 21 for a motor. FIG. 3 is a plan view showing a comparative example of the speaker damper. The speaker damper 11 of Comparative Example 1 in FIG. 3A is a corrugation damper that does not include the four notched holes of the speaker damper 1, and the speaker damper 21 of Comparative Example 2 in FIG. The corrugation damper includes track-shaped holes 25a, 25b, 25c, and 25d having a constant circumferential width w2. In the example and the comparative example, conditions other than the notch hole are the same.

Example 1
Inner radius 66mm
Outer radius 124mm
Concentric circle 6 radius 82mm
Concentric circle 7 radius 106mm
Length of first line (AB) of notch hole 15mm
(Comparative Example 2)
Notch hole circumferential width w2 6mm

  The speaker damper 1 of the present embodiment is provided with a substantially triangular cutout hole, so that when the load is small, the displacement becomes larger than in the comparative examples 1 and 2, and the linearity of the amplitude displacement is improved. On the other hand, when the load is large, the displacement is smaller than those of Comparative Example 1 and Comparative Example 2, and the amplitude is restricted. Therefore, the speaker (not shown) using the speaker damper 1 of this embodiment is improved in vibration of the vibration system including the voice coil bobbin joined to the inner peripheral portion 2, and becomes a speaker excellent in sound quality and durability.

  The positions of the three points (A), (B), and (C) on the corrugation can be freely set depending on the size of the speaker damper 1 and the number of notch holes. Preferably, the length of the second line (AC) and the third line (BC) may be 1: 0.25 to 1: 4 with respect to the length of the first line (AB), and more preferably. May be 1: 1, that is, the triangle ABC may be substantially equilateral. The larger the ratio of the circumferential width w of the cutout hole decreasing from the inner circumference 2 side to the outer circumference 3 side in the radial direction, the greater the influence of the cutout hole.

  Further, since the base material constituting the corrugation 4 is a woven fabric in which a plurality of warps and wefts are substantially orthogonal, for example, in the support arm of the corrugation 4 formed between the notches 5a and 5d, the weft is the X axis. And the warp yarns are in the Y-axis direction, and the stitches are difficult to extend in the radial direction (here, the X-axis direction). The same applies to the other three support arms, and a stitch that is substantially orthogonal to the center O is formed. Therefore, when the inner peripheral portion 2 of the damper 1 undergoes a large amplitude displacement, the support arm is adjusted to be difficult to extend. be able to.

  In the speaker damper 1 of the present embodiment, the notch hole 5a is arranged in a direction in which the straight line L connecting the center O and the notch hole 5a has a relationship of approximately 45 degrees with respect to the X axis and the Y axis. This angle can be varied between 0 and 90 degrees. For example, if the straight line L connecting the center O and the cutout hole 5a is 0 degree approaching the X axis (or 90 degrees approaching the Y axis), the stitches composed of a plurality of warp yarns and weft yarns are likely to spread. When the inner peripheral portion 2 of the damper 1 is greatly displaced in amplitude, the support arm can be adjusted so as to be easily extended. Therefore, in the speaker damper of the present invention, when not only the shape change of the corrugation 4 but also four cutout holes are provided, the angle at which the first cutout hole is arranged is changed between 0 degrees and 90 degrees. Thus, it is possible to adjust the linearity of the amplitude displacement and the amplitude limiting property.

  Moreover, the number of notches is not limited to four in the present embodiment, but may be plural. Further, the arrangement of the cutout holes need not be equally spaced in the circumferential direction, and may be uneven based on the shapes of the inner peripheral portion 2 and the outer peripheral portion 3. Specifically, the damper is not limited to a damper for a circular speaker, and may be any damper that is used for a speaker such as an ellipse or a track, and has a notch provided in a damper having a major axis and a minor axis. In this case, the position of the point (C) may be a position shifted from the vertical bisector L.

  As a method of providing the cutout hole, when cutting the inner periphery and the outer periphery of the speaker damper, the cutout hole may be cut simultaneously with a single cutting die, and the cutout hole is provided in the formed speaker damper. You may work with the cutting jig for. You may provide a notch hole by providing a small diameter round hole in the position of three points (A), (B), and (C), and cut | disconnecting so that these round holes may be connected. In this case, in the periphery of the point (A), (B) or (C), there is a portion where the circumferential width increases locally from the inner circumference 2 side to the outer circumference 3 side in the radial direction. In the overall shape of the cutout hole, the width w in the circumferential direction may be reduced in the radial direction from the inner circumference 2 side to the outer circumference 3 side.

  The base material of the speaker damper of the present invention may be a woven or non-woven fabric of cotton and polyester fiber, or aramid fiber, and the resin to be impregnated may be phenol resin or melamine resin. The present invention is not limited to the material of the base material as long as the damper includes a thermosetting resin having corrugation.

FIG. 4 is a plan view for explaining a speaker damper 31 according to another preferred embodiment of the present invention. In FIG. 4, parts common to the first embodiment are denoted by common reference numerals, and description thereof is omitted.

  The speaker damper 31 includes a support movable portion configured by a circumferential corrugation 4, and the corrugation 4 of the support movable portion includes three cutout holes 35 a, 35 b, and 35 c. In this embodiment, the three cutout holes 35a, 35b, and 35c are concentrically arranged at intervals of 120 degrees from the center, and have a substantially trapezoidal shape. That is, the point (A) and the point (B) are defined on the concentric circle 6 of the corrugation 4, and the point (D) and the point (E) are defined on another concentric circle 7 having a larger radius than the concentric circle 6. The notch hole is defined by a straight line connecting these four points (A), (B), (D) and (E). However, the point (D) and the point (E) are set so that the length of the straight line (DE) is shorter than the length of the straight line (AB). That is, the cutout hole is set so that the long side of the trapezoid is on the inner peripheral side.

  Each of the three trapezoidal cutout holes 35a, 35b, and 35c decreases in width in the circumferential direction from the inner periphery 2 side to the outer periphery 3 side in the radial direction. Preferably, the larger the difference between the length of the straight line (AB) and the length of the straight line (DE), the better. Therefore, as in the case of the first embodiment, the loudspeaker damper 31 of the second embodiment achieves the conflicting performances of ensuring the linearity of the amplitude displacement for the small input signal and limiting the amplitude for the large input signal. Can do.

  The trapezoidal cutout hole is not limited to the case where the four points (A), (B), (D), and (E) are connected in a straight line. The arcs along the concentric circles of the corrugation 4 may connect the points (A) and (B) and the points (D) and (E). What is necessary is just to set so that the length of an arc (DE) may become shorter than the length of an arc (AB). The shape of the cutout hole is not limited to a trapezoidal shape, and may be a semicircular shape having a straight line (AB) as a string or a straight line (AB) as a diameter. Even in these cases, the circumferential width of the notch hole decreases in the radial direction from the inner peripheral side to the outer peripheral side.

  The speaker damper of the present invention is not limited to a speaker using the same, and is also applicable to a damper and another vibrator having a vibration system such as a voice coil, or an electrodynamic electric-mechanical converter such as a sensor. Is possible. The magnetic circuit may be joined to the inner periphery of the damper, and is suitable for a vibrator that vibrates the magnetic circuit.

It is a figure explaining the damper for speakers by a preferred embodiment of the present invention. (Example 1) It is a characteristic view explaining the displacement characteristic with respect to the load of the damper for speakers. (Example 1, Conventional Example 1, Conventional Example 2) It is a figure explaining the conventional damper for speakers. (Conventional example 1, Conventional example 2) It is a figure explaining the damper for speakers by other preferred embodiments of the present invention. (Example 2)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Speaker damper 2 Inner peripheral part 3 Outer peripheral part 4 Corrugation 5 Notch hole 6, 7 Concentric circle

Claims (5)

An inner peripheral part to be joined to the voice coil bobbin, an outer peripheral part to be joined to the frame, and a support movable part composed of a circumferential corrugation connecting the inner peripheral part and the outer peripheral part,
The corrugation of the support movable part includes a plurality of cutout holes,
The circumferential width of the notch hole decreases in the radial direction from the inner peripheral side to the outer peripheral side.
A damper for speakers. The notch hole of the corrugation of the support movable part is
The speaker damper according to claim 1, wherein the damper is a triangle or a trapezoid. The notch hole of the corrugation of the support movable part is
Two points (A) and (B) defined on the concentric circles of the corrugation, and a perpendicular bi-level of a straight line connecting the other concentric circles having a radius larger than the concentric circles and the two points (A) and (B) For the point (C) defined as the intersection with the segment,
A first line (AB) connecting the points (A) and (B);
A second line (AC) connecting the points (A) and (C);
A third line (BC) connecting the point (B) and the point (C),
The damper for speakers according to claim 1. The cutout holes of the corrugation of the support movable part are arranged concentrically at four positions at intervals of 90 degrees from the center.
The damper for speakers according to claim 1. The speaker provided with the damper for speakers in any one of Claim 1 to 4.

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