KR101073646B1 - Support mechanism for vibration system in loudspeaker - Google Patents

Abstract

Providing a vibration system support mechanism that reduces hysteresis and improves durability without including components of rotational movement, lateral shaking and torsion in the axial vibration of the vibration system of the speaker consisting of a voice coil bobbin and a diaphragm.
The damper constituting the support mechanism includes a first damper portion including an inner circumferential edge that is joined to the voice coil bobbin and an outer circumferential edge that surrounds it, and an inner circumferential edge that forms the other end fixed to the frame and an outer circumferential edge that surrounds it. And a spiral shape consisting of a strip-shaped trapezoid having a width that extends in their radial direction, and each of the inner and outer circumferential edges of each damper portion is elastically changed in the axial direction through a plurality of arms. Both dampers are integrally joined and arranged so that each arm is symmetrically positioned with respect to the joint surface surrounding each outer peripheral edge.

Description

SUPPORT MECHANISM FOR VIBRATION SYSTEM IN LOUDSPEAKER}

The present invention comprises a damper for vibratingly supporting a vibration system comprising a diaphragm constituting a speaker and a voice coil bobbin with respect to a frame, and improves vibration characteristics, and particularly relates to a vibration system support mechanism suitable for high input.

In a conventional loudspeaker, the other axial end of the cylindrical voice coil bobbin joined to the inner circumferential edge of the diaphragm, such as a cone type, in the axial direction with respect to the frame covering the diaphragm. The most commonly used means for supporting the vibration is a round ring-shaped damper having a pleated cross section, the inner circumferential edge of which is joined to the outer circumferential surface of the voice coil bobbin, and the outer circumferential end is fixed to the inner surface of the frame, The vibration system which consists of a diaphragm and voice coil bobbin was made to vibrately support. In the pleated damper, a large amplitude vibration is possible in the case of a relatively high input. However, as the amplitude increases, there is a problem that the lateral vibration easily occurs in the voice coil bobbin or the hysteresis occurs.

As the demand for small speakers has increased recently, a small and wide frequency band, in particular, a speaker capable of withstanding high inputs is required, and various research and developments have been made on the vibrometer support mechanism, and a female damper is a representative example. have.

This female damper consists of several arms which elastically connect between the inner peripheral edge of a vibration system support side, and the outer peripheral edge of the fixed side with respect to a frame, and the arm of various shapes is proposed. According to Patent Document 1 which publishes the example, the arm extends equidistantly in the circumferential direction in the same plane between the inner circumferential border and the outer circumference of the concentric shape, respectively, connecting one end to the inner circumference and the other end to the outer circumference and the voice coil. The inner circumferential edge joined to the bobbin is vibrated in the central axis direction with respect to the outer circumferential edge fixed to the frame. In this example, at the time of vibration, the connecting portions of each arm have elasticity and incline the arm. In particular, since the inclination of the arm becomes strong due to the high input signal, it is necessary to disperse or reduce the large stress concentrated on the connecting portion between the outer rim and the arm. For this purpose, a part of the outer circumferential edge is present around one end of the arm, that is, at the connection portion between the arm and the outer circumferential edge, the outer circumferential edge is formed to protrude in the vibration direction.

In the conventional female damper, as disclosed in Patent Literature 2, a plurality of arms, each arced in shape, are each long, arranged in a spiral shape at equal intervals in the circumferential direction, and concentric circles between the inner circumferential edge and the outer circumferential edge. In a shape, there is also a damper for a small speaker connected in the same plane. In this document, in order to enlarge the reproduction frequency band of the small speaker and to reduce the stiffness of the damper, the connection portions between the both ends of the arm, the inner circumferential edge and the outer circumferential edge are harder than the constituent members of the arm or both edges. It is proposed to form with a low material and to improve the durability of a damper at the same time.

On the other hand, in order to solve the torsion problem that the connection portion between the arm and the inner rim and outer rim of the above-described type of female damper is subjected to vibration, and at the same time to adapt the speaker to the large input, it is proposed to modify the arm shape itself. This patent document 3 is disclosed. In this document 3, each arm is composed of a pair of spokes that are curved in the opposite direction in the axial direction of the voice coil bobbin, that is, the vibration direction, and have an arc shape, and at least three of these pairs of spokes are provided. It is adopted. And, when vibrating, the central portions of both arc-shaped spokes are stretched apart to approach each other, and the inner circumferential edge is vibrated axially, so the pendulum component is not included in the movement of the arm, and thus the inner and outer circumferential edges and the arm There is no twist in the connection between them.

Japanese Patent Application Laid-Open No. 2002-26239 Japanese Patent Laid-Open No. 2004-229173 Japanese Patent Application Laid-Open No. 9-275598

In the female damper shown in Patent Literature 1, the concentration of stress is reduced by reinforcing the connecting portion between the outer circumferential edge fixed to the frame and the one end of the arm, while the amplitude of the other end of the arm and the inner circumferential edge is suppressed, thus enduring high input. Although it is possible, it is not possible to cope with the large amplitude at the time of high input. In addition, since the arm oscillation is performed in the form of pendulum movement of the other end of the inner circumferential edge side with the one end of the fixed outer rim side as a support point, an arc corresponding to the amplitude of the pendulum is drawn, and the axial vibration of the inner circumferential edge and the voice coil bobbin. Is to include a rotational movement along the circumferential direction of the inner circumferential edge, and this rotational movement is a hindering of the vibration which is normal of the diaphragm. In the female damper, the other end of the arm is connected to the inner circumferential edge of the arm in the radial direction of the inner circumference, and it is the width of the radial arm that can suppress the movement in this direction, but the width thereof is also limited. Therefore, there is a fear of lateral shaking in the vibration of the outer rim and voice coil bobbin, and this also hinders normal vibration. As described above, the connecting portion of the other end of the inner circumferential edge of the arm repeats a vibration including a complex motion component, and because it is not subjected to the same reinforcement as the one of the outer circumferential edge, not only does it cause a problem of hysteresis, but also has a durability problem.

Since the female damper for a small speaker of Patent Document 2 is designed to reduce stiffness and has a structure in which both ends of the spiral arm have elastic joints, the problem of durability is almost solved. Problems of rotational movement, lateral shaking and hysteresis in the case of remarkable become remarkable, and in particular, normal vibration of the voice coil bobbin and the diaphragm at high input cannot be expected.

Unlike the concentric and helical arms of the two female dampers, the arm of the female damper disclosed in Patent Document 3 does not generate pendulum and rotational motions in the vibration direction of the vibration system of the speaker, thus providing twisting. Although the configuration does not occur, the circumferential rotation and radial movement of the inner circumference are not suppressed. Therefore, the inner rim holding the vibration system leaves problems of rotational movement, lateral shaking, and hysteresis. .

Accordingly, the present invention, as a problem to be solved, does not include a circumferential rotational motion component in the axial vibration of the voice coil bobbin and the diaphragm, and prevents the lateral shaking in the radial direction, and furthermore, elasticity against the voice coil bobbin. It is an object of the present invention to provide a vibration system support mechanism of a speaker that is excellent in durability and has reduced hysteresis without causing distortion in the support portion.

In order to achieve the above object, a vibration system support mechanism of a speaker according to the present invention according to claim 1 is a vibration coil of a speaker including a vibration plate and a voice coil bobbin coupled with the vibration plate, the voice coil carried on the voice coil bobbin is a magnetic circuit A vibration system support mechanism of a speaker comprising a damper fixed at one end so as to be vibrable in the axial direction within the magnetic gap and fixed to the frame at the other end, the support mechanism being symmetrical with respect to the joint surfaces perpendicular to the axial direction. And a first damper part including the one end and a second damper part including the other end, wherein the first damper part joins an inner circumference edge to an outer circumference of an axial one end portion of a voice coil bobbin to form the first inner circumference edge. And a band having a diameter larger than the first inner circumferential edge and widening in the radial direction. A second outer peripheral edge connected to the first inner peripheral edge elastically spaced apart in the voice coil direction elastically in the axial direction through a plurality of arms forming a four-way path, and the second damper portion joined to the first outer peripheral edge The other end is connected to the second outer rim by elastically spaced apart in the axial direction in the voice coil direction through a plurality of arms forming an outer circumference and a diameter smaller than the second outer circumference and having a band-shaped yarn extending in the radial direction. And a second inner circumferential frame.

In the invention according to claim 2, in the vibration system support mechanism of the speaker according to claim 1, an arm forming a strip-shaped trap in the first and second damper portions is along the center axis of the first inner circumferential edge or the second inner circumferential edge. A portion of the surface constituted by the trajectory moved in the direction of the voice coil at a predetermined angle while rotating the radiation from the same interval position is cut out in a spiral shape.

In the invention according to claim 3, in the vibration system support mechanism of the speaker according to claim 1 or 2, the first and second inner circumferential edges have a sawtooth portion extending in a plurality of radially outward directions, and the first and second outer circumferential edges are It has a sawtooth-shaped part extended in the radial inside direction, It is characterized by the strip | belt-shaped diagonal line of an arm meandering from each of the outward serrated parts adjacent to the circumferential direction each.

The invention according to claim 4 is the vibration system support mechanism of the speaker according to any one of claims 1 to 3, wherein the first and second damper portions are bonded to each other at the joining surface between the first outer circumferential edge and the second outer circumferential edge. It is characterized by being welded.

According to the present invention, a damper constituting a vibration system support mechanism of a speaker includes a first damper portion comprising an inner circumferential edge of one end joined to a voice coil bobbin of a vibration system and an outer circumferential edge surrounding the same, and an inner circumference of the other end fixed to the frame. It consists of two parts of the 2nd damper part which comprises an edge and the outer periphery which surrounds it, and in each damper part, both inner and outer peripheries have a plurality of spiral shape which consists of strip | belt-shaped yarns with the width which spreads in the radial direction It is elastically connected in the axial direction through the arm, and both damper portions are formed by symmetrically arranging the arms of the strip-shaped yarns with respect to the outer circumferential edge joint surfaces thereof, so that the arms of the band-shaped yarns widen in the radial direction of the damper. By this, the lateral shaking of the first damper portion is prevented. In addition, the rotational motion accompanying the pendulum movement caused by the vibration of the arm occurs only at the junction of the first and second outer circumferences, and the arms of the symmetrical arrangement vibrate the first inner circumference and the vibrometer only in the axial direction of the first damper portion. Let's do it. Therefore, the hysteresis that can occur in the vibration system support mechanism is remarkably reduced, and the concentration of stress on each connection portion during vibration decreases, and the durability of the support mechanism is surely improved.

BRIEF DESCRIPTION OF THE DRAWINGS The top view which the vibration damper support mechanism of the speaker which concerns on this invention comprises, and especially the 1st damper part side of the damper which consists of a junction body of a 1st and 2nd damper part.
FIG. 2 is a side view of a damper formed of the joined body shown in FIG. 1. FIG.
3 is a cross-sectional view schematically illustrating a state in which the damper of FIG. 1 is incorporated into a speaker in which a part of the diaphragm and the frame are cut out.
4 is a perspective view of a first damper portion of the damper of the present invention shown in FIG. 1.
Fig. 5 is a perspective view of a second damper portion of the damper of the present invention shown in Fig. 1.
Fig. 6 is a partial perspective view of the damper of the present invention shown in Fig. 1 showing the principle of slope formation of an arm formed of a band-shaped yarn;
7 is an upward perspective view of the damper of the present invention comprising the joined body of FIG. 1 or FIG. 2.
8 is a perspective view from below of the damper of FIG. 7;

(Form to carry out invention)

(Example)

1 to 8 show an embodiment of a damper D as a vibration system support mechanism of a speaker according to the present invention. As shown separately from FIG. 4 and FIG. 5, the damper D consists of the 1st damper part 10 and the 2nd damper part 20 which are mutually symmetrical with respect to the joining surface mentioned later, These 2, 7, and 8 are used in an integrated configuration.

Although the 1st damper part 10 and the 2nd damper part 20 which consist of a thermoplastic resin, a thermosetting resin, or a spring metal are comprised by the annular body of the same dimension as shown in FIG. 1, FIG. 2, FIG. Only the first damper portion 10 has a joining flange 12 extending further from the inner circumferential edge, and constitutes one end of the damper D joined to the outer circumference of one end of the voice coil bobbin VCC.

The annular body of the first and second damper portions 10 and 20 includes inner circumferential edges 11 and 21 and outer circumferential edges 13 and 23, respectively, and each edge includes a plurality of divisions having the same interval in the circumferential direction, In the case shown, it is divided into 8 divisions at intervals of 45 degrees, and for each division, the toothed portions 15 and 25 extending radially outward in the inner circumferential edges 11 and 21 and adjacent to the clockwise direction from their peaks. The arc part which connects to the radial starting point of the toothed parts 15 and 25 is provided, and in the outer peripheral edges 13 and 23, it is provided with the toothed parts 16 and 26 which extend radially inward, and those normal points. Eight parts which are provided with the arc part which connects to the radial starting point of the tooth-shaped part 16 and 26 which are adjacent to anticlockwise direction, and fit in the inner peripheral edge arc part and the outer peripheral edge arc part in these 8 divisions, In the peripheral edge A top (15 or 25) and the arm (14, 24) connecting the outer circumferential edge side of the sawtooth-shaped part (16 or 26) forming the belt-like capture is provided. That is, in each of the first and second damper portions 10, 20, the inner circumferential edge 11 and the outer circumferential edge 13 or 21 and 23 form eight strip-shaped salopes forming a part of the spiral viewed from the upper side. It is elastically connected by the arm 14 or 24 which consists of these. Since the widthwise direction of the strip-shaped yarn coincides with the radial direction of the inner and outer circumferential edges and does not bend in the direction, the vibration of the inner circumferential edge in the radial direction, that is, the lateral shaking of the voice coil bobbin (VCB) is prevented. do.

On the other hand, the inner and outer circumferential edges 11 and 13 and 21 and 23 are elastically connected by arms 14 and 24 which form a strip-shaped cap so as to be spaced apart from each other in the direction of the axis O, and in this axis direction. The arms 14 and 24 can bend only in the axial direction of the matching voice coil bobbin VCC. In this case, the inner circumferential edge 11 of the first damper portion 10 is joined to the outer circumference of one end of the voice coil bobbin (VCB) through a joining flange 12 provided at the inner circumferential edge thereof. The outer peripheral edge 23 of the second damper portion 20 is integrally bonded to each other by bonding or welding on the opposite joining surface, and the inner peripheral edge 21 of the second damper portion is fixed near the inner peripheral edge of the frame F of the speaker. Therefore, the vibration as the damper D occurs by concentrating on the inner circumferential edge 11 of the first damper portion 10. That is, the vibration of the stroke doubled by the two stages 14 and 24 of the first and second damper portions 10 and 20 is realized at the inner circumferential edge 11 of the first damper portion 10. .

Vibration caused by the bending of the two-stage arms 14 and 24 includes a circumferential reciprocating rotational motion accompanying the pendulum motion described above, but this reciprocating rotational motion of the integral body of the two outer peripheral edges 13 and 23 It is absorbed by the circumferential reciprocating motion and does not affect the axial vibration of the inner rim 11 of the first damper portion. Therefore, the vibration of the inner circumferential edge 11, which becomes a vibration as a damper, realizes substantially pure vibration in the axial direction, the problem of hysteresis is reduced, and the durability of the damper is improved.

The sum of the axial separation distances between the inner and outer rims 11 and 13 of the first damper part 10 and the axial separation distances between the inner and outer rims 21 and 23 of the second damper part 20, that is, The separation distance between the first inner circumferential edge 11 and the second inner circumferential edge 21 is a joining flange of the inner circumferential edge of the diaphragm DP and the inner circumferential edge 11 of the damper D of the voice coil bobbin VBC. It is supposed to enter the distance between the one end side of the junction side with 12 and the voice coil VC which has a width | variety in the axial direction, wound on the outer peripheral surface of the other end side, and in this position, the 2nd inner peripheral edge 21 is a voice. The coil VC is held at the center in the magnetic gap MG of the magnetic circuit MC to be adhesively fixed to the inner surface of the inner circumferential edge of the frame F.

The first and second damper portions 10, 20 are separately formed, respectively, by forming a thermoplastic material by compression molding or injection molding, and then bonding or welding the outer peripheral edges of both portions to form an integrated body. Needless to say, injection molding may be performed. In that case, as shown in FIG. 6, the form of the strip | belt-shaped yarn | ramp of the arms 14 and 24 takes the axial separation distance between both edges on the center axis line of both inner and outer periphery, and this distance is arbitrary. Divide into equal interval divisions of numbers, and use a slope drawn by a trajectory in which the division lines are moved in the separation direction at a predetermined angle while rotating each of the division lines radially. Alternatively, the thermoplastic resin material, the thermosetting resin material, or the spring metal material of the flat plate annular body having the pattern shown in Fig. 1 is cut along both side lines of the band-shaped arm 14, and then Figs. 4 or 5 It may be heat-molded or press-molded against a mold having a surface having a shape of.

D damper O axis
10 1st damper part 11 1st inner peripheral frame
12 Joint flange 13 First outer rim
14 Arm 15 Serrated outwards
16 Inward tooth profile
20 2nd damper part 21 2nd inner peripheral frame
23 second outer rim 24 arm
25 Tooth profile extending outward
26 Serrated inwards
DP diaphragm F frame
VCB Voice Coil Bobbin VC Voice Coil
MG magnetic gap MC magnetic circuit

Claims (4)

The vibration system of the speaker including the diaphragm and the voice coil bobbin coupled with the diaphragm is supported in one end so that the voice coil supported on the voice coil bobbin can vibrate in the axial direction within the magnetic gap of the magnetic circuit, and fixed to the frame at the other end. In the vibration system support mechanism of a speaker consisting of a damper,
The support mechanism is composed of a first damper portion including the one end and a second damper portion including the other end, which are symmetrical with respect to the joint surfaces perpendicular to each other in the axial direction, and the first damper portion is formed around the voice coil bobbin. Elastically voices in the axial direction through a plurality of arms which are joined to the outer circumference of one end of the axial direction and form a first inner circumferential edge which forms the one end, and a band-shaped yarn having a diameter larger than the first inner circumferential edge and widening in the radial direction. A first outer circumferential edge spaced apart in the coil direction and connected to the first inner circumferential edge, wherein the second damper portion has a second outer circumferential edge joined to the first outer circumferential edge, a diameter smaller than the second outer circumferential edge, and widened radially; The second outer periphery is spaced apart in the direction of the voice coil elastically in the axial direction through a plurality of arms forming a strip-shaped cap And a second inner circumferential edge connected to the other end to form the other end thereof. The voice coil direction of claim 1, wherein an arm forming a band-shaped trap in the first and second damper portions rotates the radiation from an equally spaced position along a central axis of the first inner circumferential edge or the second inner circumferential edge. A vibration system support mechanism for a speaker, which is formed by cutting a portion of a surface configured as a trajectory moved in a spiral shape. The first and second inner peripheral edges have serrated portions extending in a plurality of radially outward directions, and the first and second outer peripheral edges have serrated portions extending in a plurality of radially inward directions. A vibration system support mechanism for a speaker, characterized in that a strip of thread is meandered from each of the outward serrated portions to each inwardly serrated portion adjacent to the circumferential direction. The vibration system support mechanism of claim 1 or 2, wherein the first and second damper portions are bonded or welded to each other at a joining surface between the first outer circumferential edge and the second outer circumferential edge.

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