JP2007194700A - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance driving efficiency more in a speaker of small distortion. <P>SOLUTION: On the side closer to a magnetic circuit 1 than a vibration cone 3, a damper 10 having an inner circumferential end connected with a voice coil body 2 and an outer circumferential end connected with a frame 5 through a second edge 11 is provided. The second edge projects to the vibration cone 3 side or the opposite side thereof, and the damper 10 has such a structure as a first protrusion 10a protruding toward the vibration cone 3 side and a second protrusion 10b protruding in the direction opposite to that of the first protrusion 10a are repeated alternately a plurality of times. The first protrusions and second protrusions of the same number are provided and out of the first and second protrusions, the protrusion closest to the voice coil body 2 is secured to the voice coil body by adhesive 2c, and the protruding direction of the first protrusion 10a secured to the voice coil body 2 by the adhesive 2c is identical to the protruding direction of the second edge 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a speaker.

  As shown in FIG. 3, in the conventional speaker, a voice coil body 2A movably disposed on the magnetic circuit 1A is connected to the inner peripheral end of the 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 relating to the invention of this application, for example, Patent Document 1 is known.
JP 2004-7332 A

  Since the speaker shown in FIG. 3 uses the suspension holder 6A that firmly supports the diaphragm 3A, 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, An end is connected to the frame via a first edge, an inner peripheral end is connected to the voice coil body, and the diaphragm is provided closer to the magnetic circuit, and an inner peripheral end is A damper connected to the voice coil body, and an outer peripheral end of the damper is connected to the frame via a second edge, and the second edge is on the diaphragm side or vice versa. The damper has a first protrusion protruding toward the diaphragm side and a second protrusion protruding in a direction opposite to the first protrusion alternately a plurality of times. The structure that exists repeatedly And the same number of first protrusions and second protrusions, and of these first and second protrusions, the protrusion closest to the voice coil body is bonded to the voice coil body. The protruding direction of the protruding portion fixed by the agent and fixed to the voice coil body by the adhesive and the protruding direction of the second edge are the same direction.

  With this configuration, distortion of the speaker can be suppressed, and the driving efficiency can be improved by reducing the weight, which is appropriate for medium and high sounds.

  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 2a of the voice coil body 2 with an adhesive (not shown). The edge 4 is formed of a material such as urethane, foam 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 damper 10 has an inner peripheral end bonded and fixed to the magnetic circuit 1 side by an adhesive 2c rather than the diaphragm 3 fixing portion on the outer peripheral side of the body 2a of the voice coil body 2, The end portion is connected to the frame 5 via an edge 11 that is separate from the damper 10. The damper 10 has a corrugated ring structure, and is configured to expand and contract in response to the movement of the voice coil body 2, and to the diaphragm 3 in the same manner as the edge 4 provided on the diaphragm 3. It is made of a material such as urethane, foam rubber, SBR rubber or cloth so as not to apply a movable load. The edge 11 and the damper 10 will be described in further detail. First, the edge 11 has a structure protruding toward the diaphragm 3 in the present embodiment. The damper 10 includes a first protrusion 10a protruding toward the diaphragm 3 and a second protrusion 10b protruding in a direction opposite to the first protrusion 10a alternately a plurality of times. (In this embodiment, four each) The structure has a repetitive structure, and the first protrusion 10a and the second protrusion 10b have the same number (four in this embodiment). Of the first and second protrusions 10a and 10b, the first protrusion 10a closest to the voice coil body 2 is bonded and fixed to the voice coil body 2 with the adhesive 2c as described above.

  Further, the protruding direction of the first protruding portion 10a bonded and fixed to the voice coil body 2 with the adhesive 2c and the protruding direction of the edge 11 are set in the same direction, thereby suppressing distortion of the speaker. (The reason will be described later.)

  In the above configuration, when a voice signal is applied to the coil 2b of the voice coil body 2, the voice coil body 2 reacts with the magnetic field of the magnetic gap 8 to move in the vertical direction. In particular, the edge 11 is provided at the outer peripheral end portion of the damper 10 to suppress distortion of the speaker and further increase the driving efficiency of the speaker.

  Conventionally, the damper 10 is one in which both outer ends thereof are connected to the frame 5 and the voice coil body 2 to suppress rolling when the voice coil body 2 is movable. In order to easily follow the movement of the body 2, the first protrusions 10a protruding toward the diaphragm 3 side and the second protrusions 10b protruding in the opposite direction to the first protrusions 10a are alternately arranged. In this embodiment, the number of first protrusions 10a and the number of second protrusions 10b is the same (four in this embodiment). The structure is elastic.

  Thus, by making the damper 10 into a ring-shaped corrugated plate having a plurality of first protrusions 10a and second protrusions 10b, when the amount of amplitude of the voice coil body 2 is small, the damper 10 Although it is rare that a large load is applied to move the coil body 2, the load increases as the amplitude of the voice coil body 2 increases.

  Therefore, in the present embodiment, the outer periphery of the damper 10 is connected to the frame 5 via the edge 11, and in this way, the movable width of the voice coil body 2 is increased, and the damper 10 becomes a load. When the edge 11 arrives, stress is applied to the edge 11, and the edge 11 is elastically deformed in response to the stress.

  For this reason, even when the amount of amplitude of the voice coil body 2 becomes large in this way, the amplitude is not easily inhibited by the damper 10, and a decrease in drive efficiency is suppressed.

  In the present embodiment, the voice coil body 2 is supported in the vertical direction by two supports, that is, the edge 4 and the combined body of the damper 10 and the edge 11, but the driving efficiency of the diaphragm 3 is increased. Therefore, the edge 4 has a structure in which the thickness of the edge 4 is reduced to reduce its weight, thereby reducing the weight of the diaphragm 3 and the edge 4 and increasing the driving efficiency of the diaphragm 3.

  However, if the edge 4 is made thinner, the support strength of the voice coil body 2 is lowered. Therefore, the edge 11 is made thicker than the edge 4, thereby preventing the support strength of the voice coil body 2 from being lowered. (As a result, the elastic modulus of the combined body formed by the damper 10 and the edge 11 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 combination of the damper 10 and the edge 11, and therefore, in order to suppress the distortion of the vertical movement of the diaphragm 3, It is necessary to make the upper and lower loads of the combined body of the edges 11 as similar as possible.

  Therefore, first, the shape of the damper 10 in the embodiment shown in FIG.

  In the present embodiment, the first projecting portion 10a projecting toward the diaphragm 3 side and the second projecting portion 10b projecting in the opposite direction to the first projecting portion 10a are alternately arranged a plurality of times (this In the embodiment, the number of the first protrusions 10a and the number of the second protrusions 10b is the same (four in this embodiment).

  In such a shape, the first protrusion 10a closest to the voice coil body 2 is bonded and fixed to the voice coil body 2 with the adhesive 2c as described above. The first projecting portion 10a at the innermost periphery that is bonded and fixed to the adhesive 2c is not elastically deformed.

  Therefore, in order to compensate for the elasticity of the first protrusion 10a that has stopped elastically deforming in this way, the protrusion direction of the first protrusion 10a (protrusions in the direction of the diaphragm 3) and the protrusion direction of the edge 11 (the diaphragm 3). Projecting in the direction) is the same direction.

  As a result, the difference in the elastic deformation load in the vertical direction of the combined body of the damper 10 and the edge 11 is reduced, thereby suppressing the distortion of the speaker.

  Of course, the projecting portion closest to the voice coil body 2 is a second projecting portion 10b projecting in the opposite direction to the diaphragm 3, and the second projecting portion 10b is bonded to the voice coil body 2. When the adhesive is fixed by the agent 2c, in order to supplement the elasticity of the innermost second protrusion 10b that is not elastically deformed, the protrusion direction of the second protrusion 10b (the direction opposite to the diaphragm 3) The protrusion direction of the edge 11 (protrusions in the direction opposite to the diaphragm 3) is matched with the protrusion 11).

  As a result of the above, the vertical amplitude of the diaphragm 3 is substantially symmetrical in the vertical direction, so that distortion in the speaker can be reduced and the edge 4 is reduced in weight. Become.

  In the configuration in which the damper 10 is connected to the frame 5 via the edge 11 as described above, the corrugated plate-like damper 10 is used until the movable width of the voice coil body 2 is increased to some extent as described above. Since the linearity of the power linearity can be ensured, 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 edge 11 compensates for the linearity. The elastic modulus is desirably set larger (harder) than the elastic modulus of the damper 10.

  Further, it is desirable that the damper 10 and the edge 11 have different elastic moduli, and it is desirable to set both of them to function independently according to the movable width of the voice coil body 2, and between the damper 10 and the edge 11, More specifically, in the region where the damper 10 and the edge 11 are connected, the elasticity of the region is set larger (harder) than the modulus of elasticity of the damper 10 and the edge 11, thereby ensuring the independence of both.

  In setting the elastic modulus of the connection region between the damper 10 and the edge 11 to be larger (harder) than the elastic modulus of the damper 10 and the edge 11, for example, the type of adhesive that bonds the edge 11 and the damper 10 is acrylic. The edge 11 and the damper 10 are integrated by an insert mold to increase the thickness of the portion, or a reinforcing material is attached to the connection region.

  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 Cross-sectional view of a conventional speaker

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetic circuit 2 Voice coil body 3 Diaphragm 4 (1st) edge 5 Frame 8 Magnetic gap 10 Damper 10a, 10b Protrusion part 11 (2nd) edge

Claims (4)

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 end portion of the frame via a first edge A diaphragm having an inner peripheral end connected to the voice coil body, a damper provided on the magnetic circuit side from the diaphragm, and an inner peripheral end connected to the voice coil body; The outer peripheral end of the damper is connected to the frame via a second edge, and the second edge projects to the diaphragm side or the opposite side, and the damper is a diaphragm. A first protrusion protruding toward the side and a second protrusion protruding in the direction opposite to the first protrusion alternately and repeatedly exist a plurality of times, and the first protrusion And the second protrusion are the same Of these first and second protrusions, the protrusion closest to the voice coil body is fixed to the voice coil body with an adhesive, and the protrusion is fixed to the voice coil body with an adhesive. The speaker has the same direction as the protruding direction of the second edge and the protruding direction of the second edge. The speaker according to claim 1, wherein the elastic modulus of the combined body formed by the damper and the second edge is larger than the elastic modulus of the first edge. 3. 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 any one of claims 1 to 3, wherein an elastic modulus of a connection portion between the damper and the second edge is made larger than an elastic modulus of the damper and the second edge.

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