JP2007306203A - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker with low distortion the drive efficiency of which is enhanced. <P>SOLUTION: The speaker includes: a frame 5; a magnetic circuit 1 supported by the frame 5; a voice coil body 2 arranged movably with respect to a magnetic gap 8 formed in the magnetic circuit 1; a diaphragm 3 whose outer circumferential part is connected to the frame 5 via a first edge 4 and whose inner circumferential part is connected to the voice coil body 2; first and second dampers 10a, 10b provided in a side of the magnetic circuit 1 closer than the diaphragm 3 and whose inner circuit parts are connected to the voice coil body 2; and second and third edges 11a, 11b interposed between inner circumferential parts of the first and second dampers 10a, 10b and the voice coil body 2, the second edge 11a is structured to be projected toward a side of the diaphragm 3 or its opposite side, and the third edge 11b is configured to have a projection structure in a direction opposite to the projected direction of the second edge 11a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a speaker.

  As shown in FIG. 5, in the conventional speaker, a voice coil body 2A movably disposed on a magnetic circuit 1A is connected to an inner peripheral end of a diaphragm 3A, and the outer peripheral end of the diaphragm 3A is connected via an edge 4A. In this structure, the diaphragm 3A is connected to the frame 5A via the suspension holder 6A and the edge 7A. In addition, the distortion in the speaker is reduced by making the vertical amplitude of the diaphragm 3A vertically symmetric by making the protruding shapes of the edges 4A and 7A reverse.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2004-7332 A

  The speaker shown in FIG. 5 uses the suspension holder 6A that firmly supports the diaphragm 3A. Therefore, the weight increases, and it is not a problem for low-frequency sounds that add a large output. For use, there is a problem that driving efficiency is lowered due to weight.

  Accordingly, an object of the present invention is to further increase the driving efficiency in a low distortion speaker.

  In order to achieve this object, the present invention comprises a frame, a magnetic circuit supported by the frame, a voice coil body movably arranged with respect to a magnetic gap provided in the magnetic circuit, The diaphragm is connected to the frame via the first edge, the inner peripheral part is connected to the voice coil body, the diaphragm is provided on the magnetic circuit side, and the outer peripheral part is connected to the frame. The first and second dampers, and the second and third edges interposed between the inner periphery of the first and second dampers and the voice coil body, the second edge. Is configured to protrude toward the diaphragm side or the opposite side, and the third edge has a protruding structure opposite to the protruding direction of the second edge.

  With this configuration, distortion of the speaker can be suppressed, and driving efficiency can be improved by reducing the weight.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a speaker of the present invention. A magnetic circuit 1 arranged at the center of the bottom of a mortar-shaped frame 5 is a combination of a disk-shaped magnet 1a, a disk-shaped plate 1b, and a cylindrical yoke 1c. A cylindrical magnetic gap 8 opened toward the upper surface side of the magnetic circuit 1 is formed between the inner peripheral side surface of the side wall portion of the yoke 1c and the outer peripheral side surface of the plate 1b.

  The voice coil body 2 has a structure in which the coil 2b is wound around the outer peripheral portion of the cylindrical main body 2a, and is arranged so as to be movable in the vertical direction with respect to the magnetic gap 8, whereby the voice coil body 2 The thin plate-like diaphragm 3 connected to the upper outer peripheral portion is vibrated. A dust cap 9 is provided at the upper end portion of the voice coil body 2 as a dust-proof measure.

  The diaphragm 3 is a part that becomes a sound source of the speaker, and is mainly made of pulp and resin having both high rigidity and internal loss, and the frame 5 through an edge 4 whose outer peripheral end protrudes upward. The inner peripheral end portion is fixed to the outer peripheral side of the main body 2 a of the voice coil body 2. The edge 4 is formed of a material such as foamed urethane resin, foamed rubber, SBR rubber or cloth so as not to apply a movable load to the diaphragm 3.

  As shown in FIGS. 1 and 2, the dampers 10a and 10b are connected to the frame 5 in a state in which their outer peripheral end portions are integrated with a holder 10c (dimension k), and the inner peripheral end portion is a voice coil. A predetermined dimension (k) is provided on the magnetic circuit 1 side of the diaphragm 3 fixing part on the outer peripheral side of the main body 2a of the body 2 and is connected via edges 11a and 11b, respectively.

  The dampers 10a and 10b have a ring-like corrugated plate structure, and are configured to expand and contract in accordance with the movement of the voice coil body 2, and the diaphragm is similar to the edge 4 provided on the diaphragm 3. 3 is made of a material such as foamed urethane resin, foamed rubber, SBR rubber or cloth so as not to apply a large movable load. The edge 11a has a structure that protrudes to the diaphragm 3 side or the opposite side. In the present embodiment, the edge 4 has a semicircular shape with a cross section protruding upward as shown in FIG. On the opposite side, the semicircular cross section is formed so as to protrude to the opposite side of the diaphragm 3.

  In this state, at least the edge 11b having a protruding structure opposite to the protruding direction of the edge 11a is connected to the inner periphery of the damper 10b while facing the edge 11a. This edge 11b is also formed of a material such as foamed urethane resin, foamed rubber, SBR rubber or cloth so as not to apply a large movable load to the diaphragm 3, and in this embodiment, the edge 11a protrudes downward as shown in FIG. Since the cross section is semicircular, the edge 11b has a semicircular cross section that protrudes upward on the opposite side.

  When the elastic moduli of these edges 4, 11a and 11b are compared, the edge 4 has the largest flat area, but the elastic modulus is the smallest (soft), and then the elastic modulus of the edge 11b is small (soft). The edge 11a has the largest (hard) elastic modulus, and the reason for this will be described in detail later.

  When the voice signal is also applied to the coil 2b of the voice coil body 2, the speaker of this embodiment reacts with the magnetic field of the magnetic gap 8, and the voice coil body 2 moves in the vertical direction. It vibrates and emits sound. In particular, by providing the edges 11a and 11b at the inner peripheral ends of the dampers 10a and 10b, distortion of the speaker is suppressed, and the driving efficiency of the speaker is further enhanced.

  The dampers 10a and 10b are originally connected to the voice coil body 2 and the frame 5 at both outer ends, and suppress rolling when the voice coil body 2 is movable, and follow the movement of the voice coil body 2. Therefore, a ring-shaped corrugated plate structure is used to provide elasticity.

  Since the ring-shaped corrugated plate structure is used in this manner, when the amplitude amount is small, the load of moving the voice coil body 2 is rarely large, but the load is increased as the amplitude amount of the voice coil body 2 is increased. Will become bigger.

  Therefore, in the present embodiment, the inner peripheral portions of the dampers 10a and 10b are connected to the voice coil body 2 via the edges 11a and 11b. In this way, the movable width of the voice coil body 2 is increased. When the dampers 10a and 10b are loaded, stress is applied to the edges 11a and 11b, and the edges 11a and 11b are elastically deformed from a substantially circular cross-section in response to the stress.

  For this reason, even when the amplitude amount of the voice coil body 2 becomes large in this way, the presence of the dampers 10a and 10b and the edges 11a and 11b makes it difficult for the amplitude to be inhibited, and a reduction in drive efficiency is suppressed. become.

  In the present embodiment, the voice coil body 2 is supported in the vertical direction by three supports of the edge 4, the combination of the damper 10a and the edge 11a, and the combination of the damper 10b and the edge 11b. In order to increase the driving efficiency of the diaphragm 3, the edge 4 having the largest flat area is thinned to reduce its weight, thereby reducing the weight of the diaphragm 3 and the edge 4. The structure increases the driving efficiency.

  However, if the edge 4 is made thinner, the support strength of the voice coil body 2 is reduced, so that the edges 11a and 11b are made thicker than the edge 4, thereby preventing the support strength of the voice coil body 2 from being reduced. (As a result, the elastic modulus of the two combined bodies formed by the dampers 10a and 10b and the edges 11a and 11b is larger (harder) than the elastic modulus of the edge 4).

  With the above configuration, the support of the voice coil body 2 is dominated by the support of the combined body of the combined body of the damper 10a and the edge 11a and the combined body of the damper 10b and the edge 11b. 3, it is necessary to make the vertical loads of the two combined bodies, the combined body of the damper 10a and the edge 11a and the combined body of the damper 10b and the edge 11b, the same as much as possible. is there.

  First, the shape of the edge 11a in the embodiment shown in FIG.

  The edge 11a in the embodiment shown in FIG. 2 has a shape that protrudes in the opposite direction to the diaphragm 3, so that it tends to deform downward in FIG. 2, and conversely upward, that is, in the direction of the diaphragm 3. Is difficult to deform.

  Therefore, the edge 11b is provided in order to absorb the difference in ease of deformation in the vertical direction at the edge 11a.

  As is well known, the dampers 10a and 10b have a ring-shaped corrugated plate structure, and project in the direction opposite to the first projecting portion projecting toward the diaphragm 3 and the first projecting portion. And a plurality of second projecting portions, and the load in the vertical direction can be basically the same.

  However, since the edge 11a protrudes downward, the edge 11b is arranged facing the edge 11a in order to absorb the difference in the vertical load at the edge 11a (which is easily deformed downward).

  As shown in FIG. 2, the edge 11b in the present embodiment has a shape protruding in the direction of the diaphragm 3 (that is, the upper side in the figure). It is difficult to deform. For this reason, if these edges 11a and 11b are combined in a substantially circular cross-sectional state as shown in FIG. 2, the magnitudes of the vertical loads on the edges 11a and 11b can be made substantially the same.

  More specifically, these edges 11a and 11b have a slightly smaller (softer) elastic modulus than the edge 11a. The reason is that the edge 4 connecting the outer peripheral end portion of the diaphragm 3 to the frame 5 has a shape protruding upward as shown in FIG. 1 in this embodiment, so the difference in load due to the edge 4 must be taken into account. Because it must.

  As described above, the edge 4 having the largest plane area is made thin and light in weight, thereby reducing the weight of the diaphragm 3 and the edge 4 and increasing the driving efficiency of the diaphragm 3. Although the magnitude of the load for vertical movement is not so large, if it still protrudes upward in FIG. 1, it is still easy to deform upward, and conversely difficult to deform downward. Although it is slightly, it comes out.

  Therefore, in the present embodiment, as described above, the edge 11b has a slightly smaller elastic modulus (softer) than the edge 11a.

  That is, in FIG. 1 and FIG. 2, the voice coil body 2 is easier to move downward than in each figure because of the shape of the edges 4 and 11b, and upward because of the shape of the edge 11a. It is easier to move than. For this reason, it is necessary to consider the edge 11b and the edge 4 as one set for one edge 11a, and for this reason, the edge 11b has a slightly higher elastic modulus than the edge 11a as described above. It is small (soft). As a result, the vertical amplitude of the diaphragm 3 is substantially symmetrical up and down, distortion in the speaker can be reduced, and the edge 4 has been reduced in weight, so that the speaker has high driving efficiency even for medium and high sounds. .

  In addition, in the configuration in which the dampers 10a and 10b are connected to the voice coil body 2 through the edges 11a and 11b as described above, the ring until the movable width of the voice coil body 2 is increased to some extent as described above. The linearity of the power linearity can be ensured by the corrugated plate-shaped damper 10, and when the movable width of the voice coil body 2 exceeds a predetermined value and the linearity becomes difficult to ensure, the elasticity of the edges 11a, 11b Therefore, it is desirable to set the elastic modulus of each of the edges 11a and 11b to be larger (harder) than the elastic modulus of the dampers 10a and 10b.

  Further, it is desirable that the dampers 10a and 10b and the edges 11a and 11b have different elastic moduli and are set so that they function independently according to the movable width of the voice coil body 2. 10b and the edges 11a and 11b, more specifically, the elastic modulus in the connection region between the dampers 10a and 10b and the edges 11a and 11b is larger than the elastic modulus of the dampers 10a and 10b and the edges 11a and 11b. By setting it (hard), independence of both is ensured.

  In order to set the elastic modulus of the connection region between the dampers 10a and 10b and the edges 11a and 11b to be larger (harder) than the elastic modulus of the dampers 10a and 10b and the edges 11a and 11b, for example, the edges 11a and 11b and the damper A hard adhesive such as an acrylic type is used as the type of adhesive that bonds 10a and 10b, or a reinforcing material is attached to the connection region.

  3 and 4 show another embodiment, in which only the dampers 10a and 10b and the edges 11a and 11b in FIGS. 1 and 2 are changed, and the other parts are in the same state as in FIG. 3 to 5, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals to simplify the description.

  That is, in the embodiment shown in FIGS. 3 and 4, the outer peripheral end portions of the dampers 10d and 10e are connected to the frame 5, the inner peripheral end portions are connected to the edges 11a and 11b, and the edges 11a and 11b are The voice coil body 2 is connected to the magnetic circuit 1 side from the diaphragm 3 fixing portion on the outer peripheral side of the main body 2a via dampers 10f and 10g.

  The dampers 10f and 10g also have a ring-shaped corrugated plate structure, a first protrusion protruding toward the diaphragm 3, and a second protrusion protruding in a direction opposite to the first protrusion. The load in the vertical direction is basically the same. Therefore, the basic operation is substantially the same as that of the embodiment shown in FIGS.

  INDUSTRIAL APPLICABILITY The present invention can reduce speaker distortion and drive efficiency in a speaker, and is particularly useful for a mid-high frequency speaker.

Sectional drawing of the speaker in one Embodiment of this invention Enlarged sectional view of the main part Sectional drawing of the speaker in other embodiment of this invention Sectional drawing of the speaker in further another embodiment of this invention. Cross-sectional view of a conventional speaker

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetic circuit 2 Voice coil body 3 Diaphragm 4 Edge 5 Frame 8 Magnetic gap 10a Damper 10b Damper 10d Damper 10e Damper 10f Damper 10g Damper 11a Edge 11b Edge

Claims (7)

A frame, a magnetic circuit supported by the frame, a voice coil body movably disposed with respect to a magnetic gap provided in the magnetic circuit, and an outer peripheral portion connected to the frame via a first edge A diaphragm having an inner peripheral portion connected to the voice coil body, first and second dampers provided on the magnetic circuit side from the diaphragm and having an outer peripheral portion connected to the frame, and A second and a third edge interposed between the inner peripheral portions of the first and second dampers and the voice coil body, the second edge projecting to the diaphragm side or the opposite side; And the third edge has a projecting structure in a direction opposite to the projecting direction of the second edge. The speaker according to claim 1, wherein a third damper is interposed between the second edge and the voice coil body, and a fourth damper is interposed between the third edge and the voice coil body. The speaker according to claim 1, wherein the elastic modulus of the combined body formed by the first and second dampers and the second and third edges is larger than the elastic modulus of the first edge. The speaker according to claim 2, wherein an elastic modulus of a combined body formed by the first to fourth dampers and the second and third edges is larger than an elastic modulus of the first edge. The speaker according to claim 3 or 4, wherein the third edge has a smaller elastic modulus than the second edge. The speaker according to claim 5, wherein the third edge is formed of a foamed resin, and the second edge is formed of a rubber material. The speaker according to claim 6, wherein the first edge and the third edge are formed of urethane resin, and the first edge has an elastic modulus smaller than that of the third edge.

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