JP2010206559A - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a speaker thin, low in distortion and high in driving efficiency. <P>SOLUTION: A magnetic circuit 11 having a magnetic gap 17 is installed on the reverse surface of a center part of a protector 18, a diaphragm 13 in an inverted cone shape is provided on the side of the magnetic circuit 11, and a damper 15 is provided on the opposite side from the side of the magnetic circuit 11; and the diaphragm 13 is connected to a frame 19 through a first edge 14 at a position, on the side of the magnetic circuit 11, above a diaphragm 13-inner periphery connecting part of a voice coil body 12, and the damper 15 is connected to the frame 19 through a second edge 16. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a speaker.

  As shown in FIG. 6, the conventional speaker has a voice coil body 2 movably disposed on the magnetic circuit 1 connected to the inner peripheral end of the diaphragm 3, and the outer peripheral end of the diaphragm 3 is connected via an edge 4. It was connected to the frame 5, and the back surface of the diaphragm 3 was connected to the frame 5 via the suspension holder 6 and the edge 7. Moreover, the distortion in a speaker is reduced by making the vertical shape of the diaphragm 3 vertically symmetrical by making the protruding shapes of the edges 4 and 7 reverse.

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

  However, when such a speaker structure is employed, the thickness of the speaker is considerably thick because it is the sum of the heights of the magnetic circuit 1, the voice coil body 2, and the inverted conical diaphragm 3. Further, since the suspension holder 6 is formed of at least the same rigid body as that of the diaphragm 3, the driving load in the magnetic circuit 1 increases due to this, and as a result, the driving efficiency of the speaker can be improved. It was difficult.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a low distortion speaker that can be thinned and can increase driving efficiency.

  In order to achieve this object, the speaker of the present invention is provided with a magnetic circuit having a magnetic gap on the back surface of the central portion, and a protector whose outer peripheral portion is coupled to the frame, and at least the magnetic circuit in the magnetic gap of the magnetic circuit. A voice coil body in which a coil part is movably provided, and a vibration in which an inner peripheral part is connected to an outer part of the magnetic gap of the voice coil body and an outer peripheral part is connected to the frame via a first edge. An inner peripheral portion is connected to an outer portion of the magnetic gap of the voice coil body, and an outer peripheral portion is connected to the frame via a second edge on the opposite side of the diaphragm and the magnetic circuit side from the diaphragm The first edge is configured to be coupled to the frame at a position above the magnetic circuit side of the diaphragm inner peripheral coupling portion of the voice coil body. Than is.

  With this configuration, it is possible to provide a speaker that can reduce the thickness of the speaker, improve driving efficiency, and suppress distortion.

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

(Embodiment 1)
FIG. 1 is a cross-sectional view of a speaker according to Embodiment 1 of the present invention. In FIG. 1, a magnetic circuit 11 includes a disk-shaped magnet 11a, a disk-shaped plate 11b, and a circular concave yoke 11c. A magnetic gap 17 is formed between the outer periphery of the plate 11b and the inner periphery of the outer peripheral end of the yoke 11c. The magnetic flux of the magnet 11a is concentrated. The magnet 11a is mainly made of neodymium or rare earth cobalt, and the plate 11b and the yoke 11c are mainly made of iron. Although FIG. 1 shows an example of an inner magnet type, an outer magnet type magnetic circuit may be used. The magnetic circuit 11 is attached to the back surface of the central portion of the protector 18 using screws 21, and the outer peripheral portion of the protector 18 is coupled to the frame 19.

  The voice coil body 12 has a cylindrical shape, and at least a coil portion 12a is movably provided in a magnetic gap 17 of the magnetic circuit 11, and is generally a bobbin made of metal such as paper, resin, and aluminum. A coil such as a copper wire is wound on the top. A dust cap 20 as a dustproof measure is provided on the end surface of the voice coil body 12 opposite to the coil portion 12a.

  The diaphragm 13 has an inverted conical shape connected to the outer part of the magnetic gap 17 of the voice coil body 12 and has an inverted conical shape. The diaphragm 13 actually emits sound by the vibration generated by the voice coil body 12. Thus, pulp and resin having both high rigidity and internal loss are used as main materials. The diaphragm 13 is provided with an inverted conical outer peripheral portion on the magnetic circuit 11 side, and the outer peripheral portion of the diaphragm 13 is coupled to a frame 19 via a ring-shaped first edge 14. At this time, the first edge 14 is coupled to the frame 19 at a position above the inner peripheral coupling portion of the diaphragm 13 of the voice coil body 12 on the magnetic circuit 11 side.

  By setting the magnetic circuit 11 and the diaphragm 13 in such a position configuration, the thickness of the entire speaker can be significantly reduced.

  The first edge 14 is made of a material such as urethane, foam rubber, SBR rubber or cloth so as not to apply a movable load to the diaphragm 13, and the frame 19 is made of an iron plate pressed product so that it can correspond to various shapes. Materials such as resin molded products and aluminum die cast are used.

  The damper 15 has an inner peripheral end portion connected to the side opposite to the magnetic circuit 11 side than the diaphragm 13 fixing portion of the voice coil body 12, and an outer peripheral end portion protruding downward from a separate body from the damper 15. The frame 19 is connected to the frame 19 via the edge 16.

  The damper 15 has a corrugated ring structure and is configured to expand and contract in accordance with the movement of the voice coil body 12, and in the same manner as the first edge 14 provided on the diaphragm 13. 13 is formed of a material such as urethane, foam rubber, SBR rubber or cloth so as not to apply a movable load.

  Then, by applying an audio signal to the coil portion 12a of the voice coil body 12, the voice coil body 12 reacts with the magnetic field of the magnetic gap 17, and the voice coil body 12 moves in the vertical direction. In particular, the distortion of the speaker is suppressed by providing the second edge 16 at the outer peripheral end portion of the damper 15, and the driving efficiency of the speaker is further improved.

  The damper 15 is originally connected at both ends to the frame 19 and the voice coil body 12 to suppress rolling when the voice coil body 12 is moving. It is plate-shaped and has elasticity.

  However, because of the corrugated plate shape, when the amount of amplitude is small, the load of the voice coil body 12 is rarely a large load, but the load increases as the amount of amplitude of the voice coil body 12 increases. End up.

  Therefore, in the first embodiment, the outer peripheral portion of the damper 15 is connected to the frame 19 via the second edge 16, and in this way, the movable width of the voice coil body 12 is increased, and the damper 15 When the load becomes a load, a stress is applied to the second edge 16, and the second edge 16 is elastically deformed in accordance with the stress.

  For this reason, even when the amount of amplitude of the voice coil body 12 becomes large in this way, the amplitude is hardly inhibited by the damper 15, and a decrease in driving efficiency is suppressed. In addition, when the second edge 16 starts to deform, the second edge 16 and the first edge 14 have opposite projecting directions, so that there is a large difference in load with respect to the vibration of the diaphragm 13 up and down. There will be no. In this way, the damper 15 is provided with the second edge 16 to suppress an increase in the vibration load, and the first edge 14 and the second edge 16 protrude in the opposite direction with the boundary therebetween to move up and down. By making the difference in the vibration load in the direction difficult, a low distortion speaker can be obtained.

  In the configuration in which the damper 15 is connected to the frame 19 through the second edge 16 as described above, the corrugated plate-like shape is used until the movable width of the voice coil body 12 is increased to some extent as described above. The linearity of the power linearity can be ensured by the damper 15, and when the movable width of the voice coil body 12 exceeds a predetermined value and the linearity becomes difficult to ensure, the linearity is compensated by the elasticity of the second edge 16. Therefore, it is desirable that the elastic modulus of the second edge 16 is set larger (harder) than the elastic modulus of the damper 15.

  Further, it is desirable that the damper 15 and the second edge 16 have different elastic moduli, and that the damper 15 and the second edge 16 function independently of each other according to the movable width of the voice coil body 12. By setting the elastic modulus of the region between the edges 16, more specifically in the connecting region between the damper 15 and the second edge 16, larger (harder) than the elastic modulus of the damper 15 and the second edge 16. Both independence can be secured.

  In setting the elastic modulus of the connection region between the damper 15 and the second edge 16 to be larger (harder) than the elastic modulus of the damper 15 and the second edge 16, for example, the second edge 16 and the damper 15 are bonded. A hard adhesive such as acrylic is used as the type of adhesive, the second edge 16 and the damper 15 are integrated by an insert mold to increase the thickness of the part, or a reinforcing material is applied to the connection region .

  Further, when it is attempted to ensure the linearity of the power linearity of the diaphragm 13 serving as the sound generation region of the speaker, not only the above-described composite of the damper 15 and the second edge 16 is optimized, but also the damper. It is desirable to define the relationship between the composite of 15 and the second edge 16 and the first edge 14 provided on the diaphragm 13.

  In other words, what is important in this relationship is how the diaphragm 13 which is a substantial sound source of the speaker can be freely and evenly driven up and down. It is desirable to set the elastic modulus of the composite of the damper 15 and the second edge 16 to be equal to the elastic modulus of the first edge 14 provided on the diaphragm 13 in order to make maximum use of the linearity in

  Therefore, in the first embodiment, the second edge 16 is made smaller than the edge 14 as shown in FIG.

  That is, since the damper 15 has a corrugated structure and has a low elastic modulus (soft), the elastic modulus is increased (hardened) by making the second edge 16 smaller than the first edge 14, thereby the second edge 16. The elastic modulus of the composite of the damper 15 is made substantially equal to that of the first edge 14.

  Further, at the time of large amplitude, the diaphragm 13, the voice coil body 12 and the damper 15 located in the region surrounded by the first edge 14 and the second edge 16 can be regarded as an integrated rigid body. If the distance between the first edge 14 and the second edge 16 is increased, rolling of the voice coil body 12 can be suppressed and distortion can be reduced. Therefore, the distance between the first edge 14 and the second edge 16 can be reduced. In order to ensure, the 1st edge 14 is protruded on the opposite side to the damper 15, and the 2nd edge 16 is set so that it may protrude on the opposite side to the diaphragm 13, and the space | interval can be ensured.

  The protector 18 is made of a material such as an iron plate press product, a resin molded product, and an aluminum die cast so that it can cope with a complicated shape. The figure which looked at the protector 18 from the upper surface in FIG. 2 is shown. In order to radiate sound to the protector 18 side, this speaker is provided with a punching hole 22 on the entire surface except for the portion of the magnetic circuit 11 attached with a screw 21 on the back surface of the central portion. And the attachment hole 23 for attaching this speaker is provided in the four corners of this protector 18 with the frame 19 to which this protector 18 is attached.

  FIG. 3 shows a top view of a protector 18a of another embodiment. Similarly, in order to radiate sound to the protector 18a side, openings 25 are provided on the entire surface excluding the four beam 24 portions for supporting the magnetic circuit 11 attached to the center rear surface with screws 21. It is.

(Embodiment 2)
Next, FIG. 4 will be described. FIG. 4 shows a cross-sectional view of the second embodiment, and components having the same configurations as those of the first embodiment are denoted by the same reference numerals. In FIG. 4, the first edge 26 has a shape protruding toward the opposite side of the magnetic circuit 11, and the second edge 27 has a shape protruding toward the diaphragm 13.

  For this reason, since it is possible to avoid contact with the protector 18 that is in front of the first edge 26, the thickness of the entire speaker can be further reduced. When the thickness of the entire speaker is not changed, the maximum sound pressure can be increased by increasing the amplitude margin of the speaker.

(Embodiment 3)
Next, FIG. 5 will be described. FIG. 5 shows a cross-sectional view of the third embodiment, and the same reference numerals are given to the same components as those of the first embodiment. In FIG. 5, the outer peripheral end portion of the damper 28 is bent downward, and the connection position between the second edge 16 and the frame 19 is set below the damper 28 inner peripheral connecting portion of the voice coil body 12.

  As a result, the distance between the fulcrums of the first edge 14 and the second edge 16 can be made as large as possible, and the voice coil body 12 can be prevented from rolling to the maximum when moving. Speaker distortion can be reduced.

  INDUSTRIAL APPLICABILITY The present invention can reduce distortion of a speaker and improve driving efficiency, and is particularly useful for a small speaker.

Sectional drawing of the speaker of Embodiment 1 of this invention The top view of the protector of the speaker of Embodiment 1 of this invention The top view of the protector of the other Example of the speaker of Embodiment 1 of this invention Sectional drawing of the speaker of Embodiment 2 of this invention Sectional drawing of the speaker of Embodiment 3 of this invention Cross-sectional view of a conventional speaker

DESCRIPTION OF SYMBOLS 11 Magnetic circuit 12 Voice coil body 13 Diaphragm 14,26 1st edge 15,28 Damper 16,27 2nd edge 17 Magnetic gap 18 Protector 19 Frame 20 Dust cap 21 Screw 22 Punching hole 23 Mounting hole 24 Beam 25 Opening Part

Claims (7)

A protector in which a magnetic circuit having a magnetic gap is installed on the back surface of the central part and an outer peripheral part thereof is coupled to a frame; and a voice coil body in which at least the coil part is movably provided in the magnetic gap of the magnetic circuit; A diaphragm having an inner peripheral portion connected to an outer portion of the magnetic gap of the voice coil body, an outer peripheral portion being connected to the frame via a first edge, and the magnetic circuit side from the diaphragm. On the opposite side, there is provided a damper having an inner peripheral portion connected to an outer portion of the magnetic gap of the voice coil body and an outer peripheral portion connected to the frame via a second edge, the first edge being the A speaker, wherein the speaker is coupled to the frame at a position above the magnetic circuit side of a diaphragm inner peripheral connecting portion of a voice coil body. The first edge has a shape that protrudes on the opposite side to the side on which the damper is provided, and the second edge has a shape that protrudes on the opposite side to the side on which the diaphragm is provided. The speaker described. The speaker according to claim 1, wherein the first edge has a shape protruding toward the side where the damper is provided, and the second edge is protruded toward the side where the diaphragm is provided. The speaker according to claim 1, wherein the elastic modulus of the composite formed by the damper and the second edge is set to be substantially equal to the elastic modulus of the first edge. The speaker according to claim 1, wherein the elastic modulus of the second edge is set larger than the elastic modulus of the damper. The speaker according to claim 1, wherein an elastic modulus of a connection portion between the damper and the second edge is larger than an elastic modulus of the damper and the second edge. The speaker according to claim 1, wherein a connection position between the second edge and the frame is set below a damper inner peripheral connecting portion of the voice coil body.

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