JP2012010073A - Vibration system support mechanism of speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration system support mechanism which can reduce hysteresis and improve durability without including elements of rotary motion, swaying, and distortion in an axial direction vibration of a vibration system of a speaker made up of a voice coil bobbin and a diaphragm.SOLUTION: A damper to constitute a support mechanism is formed by a first damper part including an inner periphery frame which has one edge bonded to a voice coil bobbin and an outer periphery frame surrounding it, and a second damper part including the inner periphery frame which has the other edge fixed on a frame and the outer periphery frame surrounding it. The inner and outer periphery frames of each of the damper parts are elastically connected in an axial direction with different heights through multiple spiral arms formed by belt-like ramps having a width expanding in a radial direction of the frames, and both of the damper parts are arranged and jointed together so that each arm is positioned in symmetry in relation to a joint surface on which each outer periphery frame is overlapped.

Description

  The present invention relates to a vibration system support mechanism that is a damper that supports a vibration system composed of a diaphragm and a voice coil bobbin constituting a speaker so as to vibrate with respect to a frame, improves vibration characteristics, and is particularly suitable for high input. .

  In a conventional speaker, the other axial end of a cylindrical voice coil bobbin in which the outer periphery of one axial end is joined to the inner peripheral edge of a cone-shaped diaphragm is voiced to the frame covering the diaphragm. The most commonly used means for supporting the coil bobbin so as to vibrate in the axial direction is a damper having an annular shape and a corrugated cross section, and its inner peripheral edge is joined to the outer peripheral surface of the voice coil bobbin. The end is fixed to the inner surface of the frame, and the vibration system composed of the diaphragm and the voice coil bobbin is supported so as to vibrate. This corrugation type damper enables large-amplitude vibration when the input is relatively high. However, as the amplitude increases, the voice coil bobbin tends to sway sideways or a hysteresis phenomenon occurs. There was a problem.

  Along with the recent increasing demand for small speakers, there is a demand for speakers that are small and can withstand high frequency bands, especially high input power, and various types of research and development have been conducted on vibration system support mechanisms. As an example, an arm type damper may be mentioned.

  This arm type damper is composed of a plurality of arms that elastically connect between an inner peripheral frame on the vibration system support side and an outer peripheral frame on the side fixed to the frame, and variously shaped arms have been proposed. According to Patent Document 1 showing an example, the arms extend equidistantly in the circumferential direction in the same plane between the concentric inner peripheral frame and the outer peripheral frame, with one end at the inner peripheral frame and the other at the other end. The inner peripheral frame connected to the outer peripheral frame and joined to the voice coil bobbin is supported so as to be able to vibrate in the direction of the central axis with respect to the outer peripheral frame fixed to the frame. In this example, the joints at both ends of each arm elastically incline the arm during vibration, but the inclination of the arm becomes particularly strong due to a high input signal, so a large stress concentrated on the joint between the outer frame and the arm. In order to disperse or reduce the outer peripheral frame, the outer peripheral frame is formed so that a part of the outer peripheral frame exists around one end of the arm, that is, at the connecting portion between the arm and the outer peripheral frame.

  In the conventional arm type damper, as shown in Patent Document 2, a plurality of arc-shaped arms are respectively long and arranged in a spiral shape at equal intervals in the circumferential direction. There is also a damper for a small speaker that is concentrically connected to each other in the same plane. In this document, in order to expand the reproduction frequency band of a small speaker and reduce the stiffness of the damper, each connecting portion between the both ends of the arm and the inner and outer frames is connected to the arm and both the arms. It has been proposed to form a material having a lower hardness than that of the frame components and at the same time improve the durability of the damper.

  On the other hand, in order to eliminate the problem of torsion that the connection part between the arm of the above-mentioned type of arm type damper and the inner and outer peripheral frames is exposed during vibration, and at the same time, to make the speaker compatible with large input, A proposal for modifying the shape itself is shown in Patent Document 3. This document 3 employs a configuration in which each arm is composed of a pair of spokes that are curved in opposite directions in the axial direction of the voice coil bobbin, that is, in the vibration direction, and have an arc shape, and at least three pairs of the spokes are provided. ing. During vibration, the center part of both arc-shaped spokes are expanded and contracted so as to approach each other and the inner frame is vibrated in the axial direction, so the pendulum motion component is not included in the movement of the arm. There is no twist in the connecting portion between the peripheral frame and the arm.

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

  In the arm type damper shown in Patent Document 1, the concentration of stress is reduced by reinforcing the connecting portion between the outer peripheral frame fixed to the frame and one end of the arm, while the amplitude of the other end of the arm and the inner peripheral frame is reduced. Therefore, even if there is an effect that can withstand high input, it cannot cope with a large amplitude at the time of high input. In addition, the vibration of the arm is performed in the form of a pendulum motion at the other end on the inner peripheral frame side with one end on the fixed outer peripheral frame side as a fulcrum, so an arc corresponding to the amplitude of the pendulum is drawn and the inner peripheral frame and the voice coil bobbin The axial vibration includes rotational movement along the circumferential direction of the inner peripheral frame, and this rotational movement hinders normal vibration of the diaphragm. Furthermore, in this arm type damper, the other end of the arm connected to the inner peripheral frame is movable in the radial direction of the inner peripheral frame, and the movement in this direction can be suppressed by the width of the arm in the radial direction. However, the width of the outer peripheral frame and the voice coil bobbin may be laterally shaken due to restrictions on the width thereof, which also hinders normal vibration. As described above, the connecting portion at the other end on the inner peripheral frame side of the arm repeats vibration including a complicated motion component, but since it is not reinforced like the one end on the outer peripheral frame side, it only causes a problem of hysteresis. However, there is a problem with durability.

  The arm type damper for a small speaker disclosed in Patent Document 2 has a structure in which both ends of the spiral arm are provided with elastic joints to reduce the stiffness, so that the durability problem is almost solved, but it is easy to vibrate. In particular, the problems of rotational motion, side shake and hysteresis on the inner peripheral frame side become remarkable, and in particular, normal vibration of the voice coil bobbin and the diaphragm at high input cannot be expected.

  Unlike the concentric circular and spiral arms in the above two arm type dampers, the arm in the arm type damper shown in Patent Document 3 does not cause pendulum movement and rotational movement in the vibration direction of the speaker vibration system. However, the inner frame that holds the vibration system does not suppress the rotation and lateral movement, and the problem of hysteresis. Is leaving.

  Therefore, as a problem to be solved by the present invention, the axial vibrations of the voice coil bobbin and the diaphragm do not include a rotational component in the circumferential direction, prevent lateral lateral vibration, and provide an elastic support portion for the voice coil bobbin. An object of the present invention is to provide a vibration system support mechanism for a speaker that has excellent durability and reduced hysteresis without causing twisting.

In order to achieve the above object, a speaker vibration system support mechanism according to the present invention as set forth in claim 1 includes a vibration system of a speaker including a diaphragm and a voice coil bobbin coupled to the diaphragm. In the vibration system support mechanism of the speaker, which is supported by one end so that the coil can vibrate in the axial direction within the magnetic gap of the magnetic circuit and is fixed to the frame at the other end, the support mechanisms are orthogonal to each other in the axial direction. A first damper portion including the one end and a second damper portion including the other end, the first damper portion having an inner peripheral edge at one end in the axial direction of the voice coil bobbin. A first inner peripheral frame that joins the outer periphery of the portion and forms the one end, and a plurality of arms that form a strip-shaped ramp that is larger in diameter than the first inner peripheral frame and extends in the radial direction. A first outer peripheral frame that is elastically spaced in the axial direction and separated from the voice coil direction and connected to the first inner peripheral frame, and the second damper portion is joined to the first outer peripheral frame. The outer peripheral frame and a plurality of arms having a smaller diameter than the second outer peripheral frame and extending in the radial direction are elastically spaced apart in the voice coil direction in an axial direction and connected to the second outer peripheral frame. And a second inner peripheral frame forming the other end.
According to a second aspect of the present invention, in the vibration system support mechanism for a speaker according to the first aspect, the arm forming the strip-shaped oblique path in the first and second damper portions is the first inner peripheral frame or the second inner peripheral frame. A part of a plane formed by a locus moved in the direction of the voice coil at a constant angle while rotating radiation from equidistant positions along the central axis of is cut out in a spiral shape.
According to a third aspect of the present invention, in the vibration system support mechanism for a speaker according to the first or second aspect, the first and second inner peripheral frames have a plurality of serrated portions extending radially outwardly, The second outer peripheral frame has a plurality of serrated portions extending inward in the radial direction, and the belt-like ramps of the arm are skewed from each of the outward serrated portions to each of the circumferentially adjacent inward serrated portions. It is characterized by being provided.
According to a fourth aspect of the present invention, in the vibration system support mechanism for a speaker according to any one of the first to third aspects, the first and second damper portions are a first outer peripheral frame and a second outer peripheral frame. Are bonded or welded to each other at the joint surface.

  According to the present invention, a damper that constitutes a vibration system support mechanism for a speaker includes a first damper portion including an inner peripheral frame that forms one end joined to a voice coil bobbin of the vibration system, and an outer peripheral frame that surrounds the inner frame. It consists of two parts, a second damper part including an inner peripheral frame forming the other end to be fixed and an outer peripheral frame surrounding it. In each damper part, both inner and outer peripheral frames have a width extending in the radial direction. It is elastically connected in the axial direction via a plurality of spiral arms composed of strip-shaped ramps, and both damper portions are formed by symmetrically arranging the arms of the strip-shaped ramps on the joint surfaces of the respective outer peripheral frames. Lateral shaking of the first damper portion is prevented by the arm formed by the strip-shaped ramp extending in the radial direction. In addition, the rotational motion accompanying the pendulum motion due to the vibration of the arm occurs only in the joined body of the first and second outer peripheral frames, and the symmetrically arranged arm is connected to the first inner peripheral frame of the first damper portion and the vibration system. Are vibrated only in the axial direction. Accordingly, the hysteresis that can occur in the vibration system support mechanism is remarkably reduced, and stress concentration at each connecting portion during vibration is reduced, and the durability of the support mechanism is clearly improved.

The top view which comprised the vibration system support mechanism of the speaker by this invention, and was seen from the 1st damper part side especially of the damper which consists of a joined body of the 1st and 2nd damper part. The side view of the damper which consists of a joined body shown in FIG. FIG. 2 is a cross-sectional view schematically showing a state in which the damper of FIG. 1 is incorporated in a speaker shown by cutting out a part of a diaphragm and a frame. The perspective view of the 1st damper part of the damper of this invention shown in FIG. The perspective view of the 2nd damper part of the damper of this invention shown in FIG. In the damper of this invention shown in FIG. 1, the partial perspective view of the 1st or 2nd damper part which shows the principle of the slope formation of the arm which consists of a strip-shaped ramp. The diagonally upper perspective view of the damper of this invention which consists of a joined body of FIG. 1 thru | or FIG. FIG. 8 is a diagonally lower perspective view of the damper of FIG. 7.

  1 to 8 show an embodiment of a damper D as a vibration system support mechanism for a speaker according to the present invention. As shown in FIGS. 4 and 5 separately, the damper D is composed of a first damper portion 10 and a second damper portion 20 that are symmetrical with respect to a joint surface described later. 2, joined as shown in FIGS. 7 and 8 and used in an integrated configuration.

  The first damper portion 10 and the second damper portion 20 made of thermoplastic resin, thermosetting resin or spring metal are annular bodies of the same size, as can be seen in FIGS. However, only the first damper portion 10 has a joint flange 12 extending further inward from the inner peripheral edge, and constitutes one end of the damper D joined to the outer periphery of one end portion of the voice coil bobbin VCB.

  The annular bodies of the first and second damper portions 10 and 20 include inner peripheral frames 11 and 21 and outer peripheral frames 13 and 23, respectively. Each frame has a plurality of equally spaced sections in the circumferential direction. Are divided into 8 sections at intervals of 45 degrees, and for each section, serrated portions 15 and 25 extending radially outward in the inner peripheral frames 11 and 21, and serrated portions adjacent to each other in the clockwise direction from the apexes thereof. 15 and 25, arc portions connecting to the radial direction base points, and the outer peripheral frames 13 and 23, the serrated portions 16 and 26 extending radially inward, and the serrated portions adjacent to each other in the counterclockwise direction from the apexes thereof 16 and 26 are provided with arc portions connecting to the radial direction base points, and in the eight portions sandwiched between the inner peripheral frame side arc portion and the outer peripheral frame side arc portion in these eight sections, the saw blades on the inner peripheral frame side are provided. 15 or 25 and the serrated part 16 on the outer peripheral frame side, Arms 14 and 24 forming the strip-shaped ramp is provided by connecting between the 26. That is, in each of the first and second damper portions 10 and 20, the inner peripheral frame 11 and the outer peripheral frame 13 or 21 and 23 are arms 14 composed of eight strip-like ramps forming a part of a spiral when viewed from above. Or it is elastically connected by 24. Since the width direction of the strip-shaped ramp coincides with the radial direction of the inner and outer peripheral frames and does not bend in that direction, the vibration of the inner peripheral frame in the radial direction, that is, the lateral shake of the voice coil bobbin VCB is prevented.

  On the other hand, the inner and outer peripheral frames 11 and 13 and 21 and 23 are elastically connected by the arms 14 and 24 forming a strip-like oblique path so as to be separated from each other in the direction of the axis O, and the voice coil bobbin VCB that coincides with this axial direction. The arms 14 and 24 can bend only in the axial direction. In this case, the inner peripheral frame 11 of the first damper part 10 is joined to the outer periphery of one end of the voice coil bobbin VCB via the joining flange 12 provided on the inner peripheral edge thereof, but the outer peripheral frame 13 is joined to the second damper part 20. Since the outer peripheral frame 23 and the outer peripheral frame 23 are integrally bonded to each other by bonding or welding, and the inner peripheral frame 21 of the second damper portion is fixed in the vicinity of the inner peripheral edge of the frame F of the speaker, the vibration as the damper D is the first. It is concentrated on the inner peripheral frame 11 of the damper portion 10. In other words, the stroke vibration doubled by the two-stage arms 14 and 24 of the first and second damper portions 10 and 20 is realized in the inner peripheral frame 11 of the first damper portion 10.

  The vibration caused by the bending of the two-stage arms 14 and 24 includes the reciprocating rotational motion in the circumferential direction accompanying the above-described pendulum motion, and this reciprocating rotational motion is a circle of the integrally joined body of the two outer peripheral frames 13 and 23. It is absorbed by the circumferential reciprocation and does not affect the axial vibration of the inner peripheral frame 11 of the first damper portion. Therefore, the vibration of the inner peripheral frame 11 which becomes 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 distance between the inner and outer peripheral frames 11 and 13 of the first damper portion 10 and the axial distance between the inner and outer peripheral frames 21 and 23 of the second damper portion 20, that is, the first inner The separation distance between the peripheral frame 11 and the second inner peripheral frame 21 is one end of the voice coil bobbin VCB on the joint side between the inner peripheral edge of the diaphragm DP and the joint flange 12 of the inner peripheral frame 11 of the damper D. It is assumed that the second inner peripheral frame 21 is wound on the outer peripheral surface on the other end side and falls within a distance from the voice coil VC having a width in the axial direction. It is adhered and fixed to the inner surface of the inner peripheral edge of the frame F so as to be held at the center in the magnetic gap MG.

  The first and second damper parts 10 and 20 are separately formed by compression molding or injection molding of a thermoplastic material, and then the outer peripheral frames of both parts are bonded or welded to form an integrated joined body. Needless to say, injection molding may be performed integrally. In this case, as shown in FIG. 6, the strips of the arms 14 and 24 have an axial separation distance between the two frames on the center axis of the inner and outer peripheral frames, and this distance is an arbitrary number of equal intervals. Divided into sections, slopes drawn by a trajectory that is moved in the separation direction on the axis at a constant angle while rotating each section line in a radial manner are used. Alternatively, after the plate-like annular thermoplastic resin material, thermosetting resin material, or spring metal material having the pattern shown in FIG. It is also possible to apply heat molding or pressure molding to a mold having a surface having the shape of 4 or 5.

D damper O axis 10 first damper part 11 first inner peripheral frame 12 joint flange 13 first outer peripheral frame 14 arm 15 sawtooth part 16 extending outward 16 sawtooth part 20 extending inward second damper part 21 Second inner peripheral frame 23 Second outer peripheral frame 24 Arm 25 Sawtooth portion 26 extending outwards Sawtooth portion DP extending inward DP Framb VCB Voice coil bobbin VC Voice coil MG Magnetic gap MC Magnetic circuit

Claims (4)

  A vibration system of a speaker including a diaphragm and a voice coil bobbin coupled to the diaphragm is supported at one end so that the voice coil carried on the voice coil bobbin can vibrate in the axial direction within the magnetic gap of the magnetic circuit, and the other end In the vibration system support mechanism of the speaker comprising a damper fixed to the frame, the support mechanism has a symmetrical shape with respect to the joint surfaces orthogonal to each other in the axial direction, and includes the first damper portion including the one end and the other end. The first damper frame includes a first damper frame, and the first damper frame is joined to the outer periphery of one end in the axial direction of the voice coil bobbin to form the first inner frame. A first outer periphery connected to a first inner peripheral frame with a larger diameter and elastically spaced in the direction of the voice coil via a plurality of arms forming a strip-shaped ramp extending in the radial direction. And the second damper portion is axially connected to the second outer peripheral frame joined to the first outer peripheral frame and a plurality of arms having a smaller diameter than the second outer peripheral frame and forming a strip-shaped obliquely extending road. And a second inner peripheral frame which is elastically spaced in the direction of the voice coil and is connected to the second outer peripheral frame to form the other end.   The arm that forms a strip-shaped ramp in the first and second damper sections rotates the radiation from the equidistant position along the central axis of the first inner frame or the second inner frame at a certain angle toward the voice coil. 2. The vibration system support mechanism for a speaker according to claim 1, wherein a part of the surface constituted by the locus moved in a spiral manner is cut out in a spiral shape.   The first and second inner peripheral frames have a plurality of serrated portions extending radially outward, and the first and second outer peripheral frames have a plurality of serrated portions extending radially inward, and have a belt-like shape. 3. The vibration system support mechanism for a speaker according to claim 1, wherein the inclined path is provided so as to be skewed from each of the outward sawtooth portions to each of the circumferentially adjacent inward sawtooth portions. The first and second damper portions are bonded or welded to each other at a joint surface between the first outer peripheral frame and the second outer peripheral frame. Speaker vibration system support mechanism.

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