JP5167874B2 - Speaker - Google Patents

Description

  The present invention relates to a speaker.

  As shown in FIG. 3, the conventional speaker includes a voice coil body 104 in which a coil portion 103 is movably disposed in a magnetic gap 102 formed by a magnetic circuit body 101, and an outer periphery of a voice coil bobbin 105 of the voice coil body 104. A diaphragm 108 connected to the surface and connected to the frame 107 via the edge 106, provided on the magnetic circuit body 101 side of the diaphragm 108, connected to the outer peripheral surface of the voice coil bobbin 105 and the frame 107 And a damper 109 having a corrugated structure connected thereto.

  The voice coil body 104 is caused to vibrate in the vertical direction by passing an alternating current to which a voice signal is added to the coil portion 103 of the voice coil body 104, and the vertical vibration of the voice coil body 104 is transmitted to the diaphragm 108 to vibrate. The plate 108 is configured to reproduce sound by vibrating the air.

  In such a conventional speaker, the damper 109 supports the voice coil body 104 together with the composite of the diaphragm 108 and the edge 106, and further, the corrugated structure portion expands and contracts during sound reproduction, so that the vibration of the voice coil body 104 is achieved. It was a mechanism to follow.

In addition, FIG. 8 of patent document 1 is mentioned as prior art document information relevant to invention of this application.
JP-A-11-150791

  However, in the conventional speaker, the presence of the damper 109 causes the following problems.

  That is, in the conventional speaker, in order to support the voice coil body 104, the Young's modulus of the damper 109 needs to be somewhat high (hard), but the Young's modulus of the damper 109 is thus high. For this reason, if the width of the vertical vibration of the voice coil body 104 at the time of voice reproduction becomes larger than a certain amount, the movable load increases rapidly, and it becomes difficult for the voice coil body 104 to vibrate faithfully according to the input signal.

  As a result, distortion has occurred during the sound reproduction of the speaker.

  Accordingly, an object of the present invention is to reduce distortion at the time of sound reproduction of a speaker.

In order to achieve this object, the present invention provides a voice coil having a frame, a magnetic circuit body supported by the frame, and a coil portion movably disposed in a magnetic gap formed by the magnetic circuit body. Body, a dust cap provided so as to close the opening of the voice coil bobbin of the voice coil body, a diaphragm having an inner periphery connected to an outer peripheral surface of the voice coil bobbin of the voice coil body, The outer peripheral end side is connected to the outer peripheral portion, the outer peripheral end side is provided on the magnetic circuit body side with respect to the edge connected to the frame, and the voice coil bobbin outer peripheral surface of the voice coil body A non-breathable sealing member having an inner peripheral end connected thereto and an outer peripheral end connected to the frame, the magnetic member of the sealing member A first space surrounded by a road body side surface, the outer surface of the voice coil body, the magnetic circuit body and the frame, and communicates with the first space, and the dust cap and the inner surface of the voice coil body And the magnetic circuit body, or the diaphragm, the dust cap, the voice coil body peripheral surface, and the second space surrounded by the magnetic circuit body are airtight with respect to the atmosphere outside the speaker, In the speaker in which the space and the second space function as an air suspension , the seal member has non-uniform elasticity and flexibility, and a part of the seal member has high elasticity and flexibility. It is formed .

  According to the present invention, it is possible to reduce distortion during speaker sound reproduction.

This is a non-breathable seal in which stretchability and flexibility are non-uniform and a portion with high stretchability and flexibility is formed in place of a damper with a corrugation structure used in conventional speakers. A first space surrounded by the magnetic circuit body side surface of the seal member, the outer surface of the voice coil body, the magnetic circuit body, and the frame; and a dust cap and a voice coil. This is because the inner peripheral surface and the magnetic circuit body, or the diaphragm, the dust cap, the second space surrounded by the voice coil inner peripheral surface and the magnetic circuit body are airtight with respect to the atmosphere outside the speaker.

That is, in the speaker according to the present invention, since the gas is sealed in the first space and the second space by the non-breathable sealing member, the gas in the first space and the second space functions as a spring. It is configured to support the voice coil body by utilizing the spring property of the composite of the diaphragm and the edge, the gas in the first space, and the gas in the second space. Further, when the voice coil body vibrates, a portion having high elasticity and flexibility is deformed, and the seal member can follow the vibration of the voice coil body satisfactorily.

  Therefore, in the configuration of the present invention, the voice coil body can be supported without providing a damper that becomes a movable load of the voice coil body.

  As a result, the voice coil body can be vibrated faithfully according to the input signal without limiting the vibration width of the damper as in the case of the conventional speaker. It is possible to reduce distortion during audio reproduction.

  Hereinafter, the configuration of the speaker according to Embodiment 1 of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a speaker frame 1 according to this embodiment has a bottomed cylindrical frame lower portion 1a and a bottomed dish-shaped frame upper portion 1b having a larger diameter than the frame lower portion 1a. It has a shape, and a plurality of openings 2 communicating with the outside air are provided in the frame upper part 1b.

  The magnetic circuit body 3 is disposed at the bottom center of the frame lower part 1a, and is formed by combining and bonding a disk-shaped plate 3a, a disk-shaped magnet 3b, and a cylindrical yoke 3c. In addition, the magnetic circuit body 3 forms a cylindrical magnetic gap 4 between the outer peripheral side surface of the plate 3a and the inner peripheral side surface of the yoke 3c.

  The voice coil body 5 includes a cylindrical voice coil bobbin 5a and a coil 5b wound around the outer peripheral surface of the voice coil bobbin 5a. The coil 5b is disposed so as to be movable with respect to the magnetic gap 4. Above the voice coil body 5, a hemispherical dust cap 6 is connected to the diaphragm 7 so as to cover the upper opening of the voice coil bobbin 5a. This prevents the magnetic gap 4 from entering through the opening and causing a malfunction of the speaker. Note that the gold thread wire 8 connected to the coil 5b is drawn from the upper part of the voice coil body 5 to the outside of the frame 1, and an alternating current to which an audio signal is added via the gold thread wire 8 is supplied from the outside of the speaker. It is a mechanism that flows to the coil 5b.

  The diaphragm 7 has a cone shape, and an inner peripheral portion thereof is connected to an outer peripheral surface in the vicinity of the upper end portion of the voice coil body 5, and further, the outer peripheral portion is interposed through an edge 9 protruding upward. It is connected to the vicinity of the upper end of the inner peripheral surface of the frame upper part 1b. The diaphragm 7 is a portion that generates sound by vibrating vertically when reproducing sound from a speaker, and is mainly composed of pulp and resin that have both high rigidity and internal loss.

  The edge 9 has a shape protruding upward so as not to apply a movable load to the voice coil body 5 during speaker sound reproduction, and is formed of a material such as urethane foam resin, foam rubber, SBR rubber, or cloth. Yes.

  The seal member 10 has a ring shape in plan view and a substantially S-shaped cross section. The inner peripheral portion of the seal member 10 is connected to the voice coil bobbin 5 a at a portion between the gold thread wire 8 and the coil 5 b, and the outer peripheral portion is connected to the frame 1. As the material of the seal member 10, a material having excellent stretchability and flexibility and non-breathability is used. For example, a rubber material or a vinyl material may be used. In addition to this, a member made by applying a rubber coating to an appropriate material to make it non-breathable may be used.

  However, the seal member 10 has high stretchability and flexibility only in the frame 1 connection portion and the voice coil bobbin 5a connection portion indicated by the dotted circle in FIG. The portions other than these are formed so as to be close to a rigid body. That is, the stretchability and flexibility of the seal member 10 are not set uniformly, and there are portions having higher stretchability and flexibility than other portions. If comprised in this way, at the time of vibration of the voice coil body 5, the seal member 10 can follow the vibration of the voice coil body 5 by deforming the dotted circle.

  Further, the reason why the portions other than the dotted circle are close to the rigid body is to efficiently receive the air pressure received from the sealed space described later, and to effectively function the sealed space as an air suspension. That is, if the elasticity and flexibility of the seal member 10 are uniform and high, the seal member 10 may not be able to resist the air pressure received from the sealed space when the voice coil body 5 vibrates, and the seal member 10 may not maintain an appropriate shape. is there. Therefore, in this embodiment, the portion other than the dotted circle is close to a rigid body, it is possible to maintain an appropriate shape when the voice coil body 5 vibrates, and the sealed space effectively functions as an air suspension. Yes.

  In the present embodiment, the stretchability and flexibility are set to be relatively low as described above in the portion indicated by the dotted circle in FIG. 1, but not limited to this, for example, the frame 1 connection portion and the voice coil bobbin 5a connection portion. The stretchability and flexibility of only the vicinity may be set low.

  Next, the sealed space formed by the seal member 10 will be described.

  As described above, since the sealing member 10 is air-impermeable, the surface of the sealing member 10 on the magnetic circuit body 3 side, the outer peripheral surface of the voice coil body 5, the yoke 3c that is a part of the magnetic circuit body 10, the lower part of the frame The first space 11 surrounded by 1a is not in a state communicating with the outside air, and the first space 11 is airtight with respect to the atmosphere outside the speaker. Further, since the opening portion 2 is provided in the frame 1a, the communication space 12 surrounded by the edge 9, the diaphragm 7, the voice coil body 5, the upper surface of the seal member 10, and the frame upper portion 1b is outside the speaker. Although it is in a state of communicating with the atmosphere, the gas in the first space 11 is outside the speaker because the sealing member 10 blocks the gas from entering and leaving the first space 11 to the communication space 12. Will not leak into the atmosphere.

  In the present embodiment, as shown in FIG. 2 which is an enlarged view of the magnetic gap 4 portion, the coil 5b portion of the voice coil body 5 is inserted into the magnetic gap 4 so as not to contact the plate 3a and the yoke 3c. Therefore, there are slight gaps 13 between the coil 5b and the plate 3a and between the coil 5b and the yoke 3c. As shown by the arrow in FIG. 2 through the gap 13, the gas in the first space 11 is applied to the dust cap 6, the voice coil body 5, the plate 3 a that is a part of the magnetic circuit body 3, and the diaphragm 7. It is conceivable to enter and exit the second space 14 formed in this way, but, as with the first space 11, there is no opening for communicating the second space 14 with the outside air. There is no air leakage from the second space 14 to the outside of the speaker.

  Therefore, in the present embodiment, gas can be transferred from the first space 11 to the second space 14, but both the gas in the first space 11 and the second space 14 goes to the atmosphere outside the frame 1. There is no leakage, and the first space 11 and the second space 14 are airtight with respect to the atmosphere outside the speaker.

  Hereinafter, the operation and effect of the speaker according to Embodiment 1 of the present invention will be described.

  When an alternating current to which an audio signal is added is passed through the speaker coil 5b configured as described above, it reacts with the magnetic gap 4 formed by the magnetic circuit body 3, and a driving force is generated in the voice coil body 5. This driving direction follows Fleming's left-hand rule, and the voice coil body 5 vibrates in the vertical direction. The vibration of the voice coil body 5 causes the diaphragm 7 connected to the voice coil body 5 to vibrate, and the sound is reproduced from the speaker by moving the air.

  In the conventional speaker, a corrugated damper is connected to the voice coil body in order to easily follow the vibration of the voice coil body during the reproduction of the speaker.

  However, if the vibration of the voice coil body becomes larger than the predetermined amount, the damper will not be able to follow the vibration of the voice coil body, the moving load of the voice coil body will suddenly increase, and the voice coil body will faithfully follow the input signal. It was difficult to vibrate. That is, as long as the voice coil body is supported by the damper, the sound reproduced from the speaker includes distortion.

  Therefore, in this embodiment, a seal member 10 is provided instead of the damper, and the seal member 10 is made non-breathable. The surface of the seal member 10 on the magnetic circuit body 3 side, the outer peripheral surface of the voice coil body 5, and the magnetic A first space 11 surrounded by a yoke 3c that is a part of the circuit body 3 and a frame lower part 1a, a dust cap 6, a voice coil body 5, a plate 3a that is a part of the magnetic circuit body 3, and a diaphragm 7 The second space 14 surrounded by is made airtight with respect to the atmosphere outside the speaker.

  As described above, if the first space 11 and the second space 14 are airtight with respect to the atmosphere outside the speaker, the gas inside the first space 11 and the second space 14 functions as a spring. The first space 11 and the second space 14 function as an air suspension.

  That is, in this embodiment, the voice coil body 5 is made of the composite of the edge 9 and the diaphragm 7 and the spring property of the first space 11 and the second space 14 without providing a damper as in the conventional speaker. It can be fully supported by use.

  Further, as described above, since the seal member 10 has excellent flexibility and stretchability in the dotted-line circled portion shown in FIG. 1, the voice coil body 5 in the vertical direction is reproduced during the sound reproduction of the speaker. The vibration is not limited, and the seal member 10 does not apply a movable load to the voice coil body 5 unlike a conventional speaker damper.

  As a result, the voice coil body 5 can vibrate faithfully in accordance with the input signal, and distortion included in the sound reproduction of the speaker can be reduced.

  In this embodiment, the outer peripheral end of the dust cap 6 is connected to the diaphragm 7, and the second space 14 is a space surrounded by the diaphragm 7, the dust cap 6, the voice coil body 5, and the magnetic circuit body 3. In addition to this, the outer peripheral end of the dust cap 6 is connected to the upper end of the voice coil bobbin 5 a, and the second space 22 is the plate 3 a that is a part of the dust cap 6, the voice coil body 5, and the magnetic circuit body 3. The same effect can be obtained even if it is constituted by.

  Further, it is desirable to use an adhesive containing modified silicone for bonding the members forming the first space 11.

  Here, the first space 11 is formed by bonding the members of the seal member 10, the voice coil body 5, the magnetic circuit body 3, and the frame 1 with an adhesive. In order to function sufficiently as an air suspension, it is necessary to suppress air leakage from the bonded portion to the outside of the speaker as much as possible.

  For this reason, the use of an adhesive composed mainly of modified silicone, which has almost no volume change after drying, can reduce the generation of air holes after the adhesive is dried. It is possible to reduce the possibility of air leakage into the air.

  Moreover, it is desirable to use an adhesive containing modified silicone for bonding the members forming the second space 14 in addition to bonding the members of the first space 11.

  That is, in the present invention, if an adhesive mainly composed of denatured silicone is used for bonding the members of the dust cap 6, the diaphragm 7, and the voice coil body 5 that form the second space 14, the speaker from the bonded portion is used. The possibility of air leakage to the outside can be reduced, and the spring property of the gas inside the first space 11 and the second space 14 can be enhanced.

  In the loudspeaker according to the present invention, the voice coil body can be supported by the composite of the diaphragm and the edge and the seal member by utilizing the gas spring property.

  That is, the speaker according to the present invention does not use a damper that causes the movable load of the voice coil body, and can vibrate the voice coil body faithfully according to the input signal, and is included in the sound reproduction of the speaker. Distortion can be reduced.

  Therefore, the present invention can be suitably employed for various types of audio equipment.

Sectional drawing of the speaker in embodiment of this invention The enlarged view of the magnetic gap part of the speaker in embodiment of this invention Cross-sectional view of a conventional speaker

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame 1a Frame lower part 1b Frame upper part 2 Opening part 3 Magnetic circuit body 3a Plate 3b Magnet 3c Yoke 4 Magnetic gap 5 Voice coil body 5a Voice coil bobbin 5b Coil 6 Dust cap 7 Diaphragm 8 Gold thread wire 9 Edge 10 Seal member 11 1st Space 12 Communication space 13 Gap 14 Second space

Claims (8)

Frame,
A magnetic circuit body supported by the frame;
A voice coil body in which the coil portion is movably disposed in a magnetic gap formed by the magnetic circuit body;
A dust cap provided to close the opening of the voice coil bobbin of the voice coil body;
A diaphragm having an inner peripheral portion connected to an outer peripheral surface of the voice coil bobbin of the voice coil body, and an edge having an inner peripheral end connected to the outer peripheral portion of the diaphragm and an outer peripheral end connected to the frame A non-breathable seal member provided on the magnetic circuit body side of the diaphragm, the inner peripheral end side of which is connected to the voice coil bobbin outer peripheral surface of the voice coil body and the outer peripheral end side of which is connected to the frame. A first space surrounded by the magnetic circuit body side surface of the seal member, the voice coil body outer peripheral surface, the magnetic circuit body and the frame, and communicated with the first space, Surrounded by the dust cap and the voice coil inner circumferential surface and the magnetic circuit body, or the diaphragm, the dust cap, the voice coil inner circumferential surface and the magnetic circuit body. A second space is airtight to the atmosphere of the speaker outside that, in the speaker of the first space and the second space to function as an air suspension, stretchability and flexibility of the seal member is not A loudspeaker that is uniform and has a portion having high stretchability and flexibility in a part of the seal member . The speaker according to claim 1, wherein members forming the first space are bonded with an adhesive containing a modified silicone. The speaker according to claim 1, wherein members forming the first space and the second space are bonded to each other with an adhesive containing a modified silicone. 2. The speaker according to claim 1, wherein the portion having high elasticity and flexibility is in the vicinity of a connection portion between the connection portion with the frame and the voice coil bobbin in the seal member. The speaker according to claim 1, wherein the seal member is provided in place of a damper having a non-corrugated structure. The speaker according to claim 5, wherein the seal member is substantially S-shaped. The speaker according to claim 1 or 6, wherein the portion having high stretchability and flexibility is provided on a protruding portion of the seal member. An opening is formed in the frame, and a space surrounded by the edge, the diaphragm, the voice coil body, the upper surface of the seal member, and the frame is in contact with the atmosphere outside the speaker. The speaker according to claim 1 communicated.

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