JP4898957B2 - Speaker device - Google Patents

Description

  The present invention relates to a speaker device.

A speaker device having a dome-shaped diaphragm is known. In a typical dome-type speaker device, only the outer periphery of the diaphragm is supported by the frame so that it can vibrate freely through the edges. For example, vibration propagated from the voice coil overlaps near the center of the diaphragm and resonates. , Unnecessary vibrations such as reverse resonance (divided vibrations) may occur and the acoustic characteristics may deteriorate.
For example, a speaker device that has a structure in which an inner peripheral portion of a dome-shaped diaphragm is supported by a support portion and reduces the unnecessary vibration is known (for example, see Patent Document 1).

Japanese Utility Model Publication No. 60-111195

  In one embodiment of the speaker device described in Patent Document 1, a plurality of window holes are formed on the side surface of the conical copper plate, and the air on the back side of the diaphragm passes through the window hole on the copper plate to the back side of the diaphragm. It is possible to flow towards.

  However, the outer peripheral part of the copper plate is attached to the upper end of the center pole part, and the air moves through the window hole of the copper plate, for example, the copper plate vibrates and emits unnecessary sound waves, and is emitted from the back side of the diaphragm. There is a problem that the acoustic characteristics are deteriorated due to interference between a reflected wave generated when the sound wave is reflected by the copper plate and a sound wave emitted from the front side of the diaphragm.

  This invention makes it an example of a subject to cope with such a problem. That is, in a speaker device having a dome-shaped diaphragm, it prevents the deterioration of acoustic characteristics, prevents the generation of unnecessary sound waves caused by vibration of the diaphragm, and the reflected wave generated by reflection of sound waves generated on the back side of the diaphragm It is an object of the present invention to prevent deterioration in acoustic characteristics due to interference between sound waves emitted from the front side of the diaphragm and the like.

In order to achieve such an object, the speaker device of the present invention includes at least the configurations according to the following independent claims.
[Claim 1] It has a frame, a vibrating body supported by the frame, a magnetic circuit, and a support pillar disposed on the magnetic circuit and extending in a sound radiation direction, A diaphragm, and a voice coil fixed to the diaphragm and loosely fitted in a magnetic gap of the magnetic circuit, the diaphragm having an outer peripheral portion of the diaphragm coupled to the frame so as to freely vibrate The inner peripheral portion of the diaphragm is supported by the support column so as to freely vibrate, and the support column extends along a direction perpendicular to the first hole portion formed along the axial direction and the axial direction. And a second hole portion that communicates with the first hole portion.

It is sectional drawing explaining the speaker apparatus which concerns on embodiment of this invention. It is sectional drawing explaining the speaker apparatus which concerns on embodiment of this invention. It is sectional drawing explaining the speaker apparatus which concerns on embodiment of this invention. It is sectional drawing explaining the speaker apparatus which concerns on embodiment of this invention. It is sectional drawing explaining the speaker apparatus which concerns on embodiment of this invention. It is sectional drawing explaining the speaker apparatus which concerns on embodiment of this invention. It is sectional drawing explaining the speaker apparatus which concerns on embodiment of this invention. It is sectional drawing explaining the speaker apparatus which concerns on embodiment of this invention. It is sectional drawing explaining the speaker apparatus which concerns on embodiment of this invention. It is sectional drawing explaining the speaker apparatus which concerns on embodiment of this invention. FIG. 2 is an exploded cross-sectional view of the speaker device shown in FIG. 1. It is a figure for demonstrating the diaphragm and inner peripheral support part of the speaker apparatus shown in FIG. (A) is a diaphragm and a plan view viewed from the acoustic radiation direction side, and (B) is a cross-sectional view of the diaphragm and the inner periphery support portion shown in (A). It is a figure for demonstrating the principal part of the speaker apparatus shown in FIG. (A) is the cross-sectional perspective view which expanded the principal part vicinity, such as a diaphragm of the speaker apparatus shown in FIG. 1, a support | pillar, an equalizer, and (B) is the whole perspective view of the support | pillar shown to (A). It is sectional drawing along the direction orthogonal to the longitudinal direction of the support | pillar center part of the speaker apparatus shown in FIG. It is a figure for demonstrating the sound pressure frequency characteristic of the speaker apparatus which concerns on one Embodiment of this invention. It is explanatory drawing which showed other embodiment of this invention. It is explanatory drawing which showed the motor vehicle which concerns on embodiment of this invention.

  Embodiments of the present invention will be described below. 1 to 10 are sectional views of a speaker device according to an embodiment of the present invention. The speaker device 1 includes a frame 6, a vibrating body 3 supported by the frame 6, a magnetic circuit 2, and a column 4 that is disposed on the magnetic circuit 2 and extends toward the sound radiation direction SD. The vibrating body 3 includes a vibration plate 31 and a voice coil 32 that is fixed to the vibration plate 31 and loosely fitted in the magnetic gap 2G of the magnetic circuit 2. The vibration plate 31 is an outer peripheral portion 31B of the vibration plate 31. Are connected to the frame 6 so as to be able to vibrate, and the inner peripheral portion 31A of the diaphragm 31 is supported by the support column 4 so as to be able to vibrate. The support column 4 is formed with a first hole (vertical) formed along the axial direction. Hole) 401, and a second hole portion 402 formed in a direction orthogonal to the axial direction and communicating with the first hole portion 401 is formed in a part of the support column 4 or the magnetic circuit 2. It is characterized by being.

According to such a feature, the space formed in the side portion of the support column 4 can be communicated with the first hole 401 by communicating the second hole 402 and the first hole 401. The internal pressure of the side space of the column 4 can be absorbed using the space formed by the first hole 401 itself or the space where the first hole 401 communicates. Therefore, when the side space of the support column 4 is used as the back pressure space of the diaphragm 31, the back pressure fluctuation of the diaphragm 31 can be absorbed, and the acoustic characteristics can be improved.
Moreover, the support | pillar 4 is provided with the projection part 47 which protrudes in an acoustic radiation direction from the diaphragm 31, and the 1st hole 401 is extended so that it may protrude in an acoustic direction from the diaphragm 31 (refer 401A), The lid 5 includes a fitting portion that fits into the protrusion 47 of the support column 4, and the first hole 401 communicates between the protrusion 47 of the support column 4 and the fitting portion of the cover 5. A space 411 is formed. According to this, the space which absorbs the back pressure fluctuation of the diaphragm 31 can be enlarged by the space formed in the space 411 or the lid portion 5.

  Another feature of the speaker device 1 is that the magnetic circuit 2 or a support portion 64 that supports the magnetic circuit 2 and a first space 92 surrounded by the inner surface of the frame 6 are formed in the frame 6. A second space 91 surrounded by the magnetic circuit 2 and the diaphragm 31 is formed, and the first space 92 and the second space 91 are the first and second holes 401 and 402 and the magnetic circuit. 2 is communicated through a vent hole 201 formed in the second shape.

  According to this feature, since the second space 91 becomes the back pressure space of the diaphragm 31, this space becomes the first space 92 (back chamber) via the second hole 402 and the first hole 401. You will communicate with. As a result, fluctuations in the back pressure of the diaphragm 31 are absorbed, and heat generated in the magnetic circuit 2 can be released to the first space 92. This makes it possible to improve acoustic characteristics such as, for example, expansion of a low-frequency band, and improve the durability of the speaker device.

  As another feature of the speaker device 1, as shown in FIG. 2, a sound absorbing member 80 is disposed in the vent hole 201 of the magnetic circuit 2. Further, a sound absorbing member 81 is arranged in the first space 92. The sound absorbing members 80 and 81 may be the integrated sound absorbing member 8 or may be provided separately. Further, the sound absorbing members 8, 80, 81 are also characterized by being arranged so as to cover one end of the vent hole 201 of the magnetic circuit 2.

  According to such a feature, since the sound absorbing members 8, 80, 81 absorb unnecessary sound, the acoustic characteristics of the speaker device 1 are improved. When the back space (second space 91) of the diaphragm 31 and the first space 92 (back chamber) are communicated with each other, sound radiated to the back side of the diaphragm 31 is transmitted through the vent hole 201 to the first space. A space 92 is reached. In the first space 92, sound may be repeatedly reflected on the wall surface to cause resonance, and the reflected sound may return to the diaphragm side and cause interference. When such a phenomenon occurs, there is a concern that the sound pressure frequency characteristic of the speaker device 1 has a peak or dip at a specific frequency, and the acoustic characteristic is deteriorated. By providing the sound absorbing member 8 described above, such resonance and interference can be suppressed, and good acoustic characteristics can be maintained. By arranging the sound absorbing member 8 so as to cover one end of the vent hole 201 of the magnetic circuit 2, resonance and interference can be further suppressed.

As another feature of the speaker device 1, as shown in FIG. 3, the support column 4 is formed below a column portion 41, a protrusion 47 formed on the upper end portion of the column portion 41, and the column portion 4. The second hole portion 402 is formed in the leg portion 43, and the leg portion 43 is provided. By providing the second hole portion 402 in the leg portion 43 close to the magnetic circuit 2, the heat radiation of the magnetic circuit 2 can be quickly released to the first space 92 side.
The first hole 401 is formed in the column part 41 and the leg part 43, and the column part 41 includes a protrusion 47 having a shape protruding in the acoustic radiation direction from the diaphragm 31. The portion 401 has a lid portion 5 that extends so as to protrude in the sound radiation direction of the diaphragm 31, and has a fitting portion that fits into the protrusion portion 47 of the support column 41. A space 411 is formed between the lid portion 5 and the fitting portion. According to this, even when the sound absorbing member 8 is provided, the space formed in the space 411 or the lid portion 5 is used to enlarge the space for absorbing the back pressure fluctuation of the diaphragm 31, Part of the air in the first space 92 can enter and exit, and the heat transferred from the plate 23 to the support column 4 and accumulated can be released to the first space 92 side.

  As another feature of the speaker device 1, as shown in FIG. 4, the vibrating body 3 includes an inner peripheral support portion 35 that supports the inner peripheral portion 31 </ b> A of the diaphragm 31, and the inner peripheral portion 31 </ b> A of the diaphragm 31 is The second hole portion 402 is formed in the vicinity of the inner peripheral support portion 35 and is supported by the support column 4 via the inner peripheral support portion 35. By forming the second hole portion 402 in the vicinity of the inner peripheral support portion 35, a part of the air in the first space 92 can be made to enter and leave the first hole portion 401, and the plate 23 can be moved to the support column 4. The transferred and accumulated heat can be released to the first space 92 side.

  As another feature of the speaker device 1, the support column 4 is supported by the constituent members constituting the magnetic circuit 2, and the second hole portion 402 is located in the vicinity of the magnetic circuit 2, for example, as shown in FIG. 3. It is formed. According to this, by forming the second hole 402 in the vicinity of the magnetic circuit 2, the heat radiation of the magnetic circuit 2 can be quickly released to the first space 92 side.

  As another feature of the speaker device 1, the support column 4 is formed at an outer diameter column part 41 larger than the inner diameter of the inner periphery support part 35 and at the tip of the column part 41 and smaller than the inner diameter of the inner periphery support part 35. It is formed between the projection 47 formed in substantially the same outer diameter and projecting in the acoustic radiation direction from the inner peripheral portion 31A of the diaphragm 31, and between the column 41 and the projection 47, and in the axial direction of the column 4. The inner peripheral support portion 35 is in a state where the inner peripheral portion of the inner peripheral support portion 35 is fitted to the protruding portion 47 of the support column 4, The second hole portion 402 is connected to the flat step portion 42, and is formed below the protrusion portion 47 of the support column 4 (see FIG. 4). According to this, since the second hole portion 402 is provided in the vicinity of the inner peripheral portion 31A of the diaphragm 31 provided with the inner peripheral support portion 35, the air in the first space 92 is placed in the first hole portion 401. The heat transferred from the plate 23 to the support column 4 and accumulated can be released to the first space 92 side.

  As another feature of the speaker device 1, as shown in FIGS. 5 to 7, the magnetic circuit 2 includes a plate 23, a magnet 22, and a yoke 21, and the second hole 402 is formed in the plate 23. It is characterized by being. In the example shown in FIG. 5, a groove 23S is formed in the plate 23, and the groove 23S communicates with a second hole 402 formed in the support column. In the example shown in FIG. 6, the deep groove 23 </ b> S itself formed in the plate 23 forms the second hole 402. In the example shown in FIG. 7, a lateral hole 23 </ b> P is formed in the plate 23 in an oblique direction, and the lateral hole 23 </ b> P is a second hole 402. According to this, by forming the second hole 402 in the magnetic circuit 2, the heat radiation of the magnetic circuit 2 can be quickly released to the first space 92 side.

  In the example shown in each figure described above, the first hole 401 has a smaller diameter than the vent hole 201 formed in the magnetic circuit 2, but the present invention is not limited to this, as shown in FIG. The first hole 401 and the vent hole 201 formed in the magnetic circuit 2 may have the same diameter. Further, the second hole 401 may be enlarged stepwise or continuously in the direction of the magnetic circuit 2, and the hole diameter may be changed as necessary. When the back space fluctuation of the diaphragm 31 cannot be absorbed only by the second space 92, the volume required for the absorption can be expanded by expanding the vent hole 201, and the back pressure fluctuation of the diaphragm 31 can be further absorbed.

  As another feature of the speaker device 1, as shown in FIG. 9, the frame 6 includes a support portion 64 that supports the magnetic circuit 2, and the outer surface of the support portion 64 has an uneven surface 64a. . Further, the uneven surface 64 a may be formed on the inner surface of the frame 6 (first frame 61) facing the first space 92. Further, an inclined surface 64b is formed on the outer surface of the support portion 64 as shown in FIG. The inclined surface may be formed on the inner surface of the frame 6 (first frame 61) facing the first space 92.

  As described above, the concave and convex surface 64a is formed on the outer surface of the support portion 64 that hits the inner wall surface of the first space 92, the inner surface of the first frame 61, or the outer surface of the yoke of the magnetic circuit 2, and thus the first space. Sound that reaches 92 can be diffused. As a result, it is possible to suppress a phenomenon in which a sound generated from the back side of the diaphragm 31 interferes with a sound reflected by the inner wall surface of the first space 92 and a standing wave is generated. Similarly, the inclined surface 64b is formed on the outer surface of the support portion 64 that hits the inner wall surface of the first space 92, the inner surface of the first frame 61, or the outer surface of the yoke of the magnetic circuit 2, so that the reflected wave is generated. The traveling directions can be made different from each other, and the phenomenon that the standing wave is generated by the sound generated from the back side of the diaphragm 31 interfering with the sound reflected by the inner wall surface of the first space 92 can be suppressed.

  As another feature of the speaker device 1, the inner peripheral support portion 35 extends between the inner peripheral portion 31 </ b> A of the diaphragm 31 and the support column 4 along a direction orthogonal to the vibration direction of the voice coil 32. It is characterized by. More specifically, the inner peripheral support portion 35 is formed in a cross-sectional shape corresponding to the radial cross-sectional shape of the vibration plate 31 from the bending portion 354 and the bending portion 353 to the outer peripheral portion. A connecting portion 352 that is connected to the inner peripheral portion 31A, a connecting portion 355 that is formed on the inner peripheral portion 356 of the inner peripheral supporting portion 35 and that is connected to the support column 4, and is formed between the connecting portion 355 and the bent portion 353. And having a radial cross-section flat plate-shaped portion 354 (see FIG. 12).

  Another feature of the speaker device 1 is that it has an equalizer 5 having a fitting portion that fits into the protruding portion 47 of the support column 4, and the inner peripheral support portion 35 has an inner peripheral portion 356 at the protruding portion 47 of the support column 4. It is fitted and connected to the flat step portion 42, and is sandwiched between the flat step portion 42 and the equalizer 5 (see FIG. 4).

  The equalizer 5 is provided at the acoustic radiation side end of the support column 4 and reduces the disturbance of the sound pressure frequency characteristic of the sound wave radiated from the diaphragm 31 according to its shape. Further, the equalizer 5 can obtain a desired directivity characteristic of the sound wave emitted from the diaphragm according to the shape thereof. By supporting the inner peripheral support portion 35 by sandwiching it between the equalizer 5 and the flat step portion 42, the inner peripheral support portion 35 is supported in a cantilever manner, and the support rigidity can be increased. Thereby, unnecessary vibrations in the inner peripheral support portion 35 can be suppressed.

  As another feature of the speaker device 1, as shown in FIG. 13, the equalizer 5 is disposed on the acoustic radiation side of the diaphragm 31, and at least the inner circumference support portion is spaced from the inner circumference support portion 35 by a specified interval 501. It is formed in the shape which covers 35 radial direction cross-section flat plate shape parts 354, It is characterized by the above-mentioned. Since the equalizer 5 is provided in this way, even if the inner peripheral support portion 35 is reversely resonated at a specific frequency due to the gap of the specified interval 501 between the bottom portion of the equalizer 5 and the inner peripheral support portion 35, the inner peripheral side The sound wave emitted from the support part 35 is phase-inverted and superposed on the sound wave of the diaphragm 31, so that flat acoustic characteristics can be obtained. In addition, since the equalizer 5 is provided, it is possible to prevent unnecessary sound waves emitted from the inner periphery side support portion 35 from being emitted toward the user.

  As another feature of the speaker device 1, the diaphragm 31 is characterized in that the inner peripheral portion 31A is formed in a shape located on the acoustic radiation direction side of the outer peripheral portion 31B, and the surface is formed in a curved shape. . Further, as another feature of the speaker device 1, the vibrating body 31 includes an outer peripheral support portion 34 and a voice coil support portion 33, and the diaphragm 31 can vibrate freely via the outer peripheral support portion 34. The voice coil 32 is supported by a voice coil support portion 33, and the magnetic circuit 2 includes a plate 23, a magnet 22, and a yoke 21. Due to such characteristics, the present invention can be applied to a speaker device having a dome-shaped diaphragm as shown in the figure.

  Another feature of the speaker device 1 is that the inner peripheral support portion 35 is formed of a material having an internal loss larger than that of the diaphragm 31 and is formed to be deformable with respect to the vibration of the diaphragm 31. . Thus, by providing the inner periphery support part 35 formed of a material having a relatively large internal loss, unnecessary vibrations such as resonance and reverse resonance can be reduced, for example.

  Hereinafter, each component of the speaker device 1 will be specifically described with reference to FIGS. The speaker device 1 described here can be employed in a speaker device such as a high-pitched speaker device (so-called tweeter), a small speaker device, a vehicle-mounted speaker device, or the like. And the speaker apparatus 1 which concerns on embodiment of this invention is especially suitable for vehicle-mounted use. The automobile 1X (see FIG. 17) equipped with the speaker device 1 according to the embodiment of the present invention can realize a comfortable driving environment by taking advantage of the good acoustic characteristics of the speaker device 1.

[Magnetic circuit 2]
As the magnetic circuit 2, for example, an inner magnet type magnetic circuit, an outer magnet type magnetic circuit, or the like can be adopted. In the illustrated example, the magnetic circuit 2 employs an internal magnetic circuit, but is not limited thereto. The magnetic circuit 2 includes a magnetic gap 2G in which the voice coil 32 is loosely fitted. The magnetic circuit 2 is formed in a prescribed shape such as a rectangular shape, a circular shape, or an elliptical shape. In the illustrated example, the magnetic circuit 2 is formed in a circular shape, but is not limited thereto. The magnetic circuit 2 is supported by a frame 6. The frame 6 may be provided with a support portion 64 so that the yoke 21 of the magnetic circuit 2 is supported by the support portion 64 (see FIGS. 8 and 9).

  In a specific example, the magnetic circuit 2 includes a yoke 21, a magnet 22, a plate 23, and a short ring (annular metal member) 25. A sound absorbing member 24 may be disposed on the plate 23 of the magnetic circuit 2. A short ring 25 may be disposed in the magnetic gap 2G.

  In the illustrated example, the yoke 21 has a substantially U-shaped cross section. In detail, the yoke 21 is formed with a cylindrical portion that is bent and extended in the acoustic radiation direction from the edge of the flat bottom surface portion. The yoke 21 is made of a known material such as iron or an alloy. Further, the yoke 21 has a hole at the center of the bottom surface.

  The magnet 22 is a permanent magnet including a prescribed material such as neodymium, samarium / cobalt, ferrite, or alnico. In the illustrated example, the magnet 22 is provided on the yoke 21. The magnet 22 is formed in a flat plate shape and has a ring shape with a hole formed in the center.

  The plate 23 is made of a specified material such as iron or an alloy, and is provided on the magnet 22 as shown in the drawing. The plate 23 is formed in a flat plate shape and has an annular shape in which a hole is formed in the center.

  The short ring 25 is provided in order to suppress the occurrence of current distortion in the voice coil 32 in the magnetic gap 2G of the magnetic circuit 2. The short ring 25 is made of, for example, a metal material such as aluminum or copper, a low saturation magnetic flux density material, or a nonmagnetic material. As illustrated, the short ring 25 is formed in an annular shape from copper and is provided in the vicinity of the magnetic gap 2 </ b> G of the yoke 21. Further, the short ring 25 can reduce harmonic distortion included in the reproduced sound of the speaker.

  In the illustrated example, a sound absorbing member 24 is provided on the plate 23 of the magnetic circuit 2. Specifically, the sound absorbing member 24 is provided on the magnetic circuit 2 on the side opposite to the acoustic radiation direction in the inner peripheral support portion 35. The sound absorbing member 24 reduces unnecessary sound in the space 91 surrounded by the diaphragm 31 and the magnetic circuit 2. The sound absorbing member 24 is made of a known material such as a resin member such as low-foam urethane, artificial leather, cloth, or non-woven fabric.

[Vibrating body 3]
As shown in the figure, the vibrating body 3 is supported by a frame 6 so as to freely vibrate. Specifically, the vibrating body 3 includes a diaphragm 31 (dome-shaped diaphragm), a voice coil 32, a voice coil bobbin 33, an outer peripheral side edge (outer peripheral support part) 34, and an inner peripheral side edge (inner peripheral support part) 35. Have.

  The diaphragm 31 is formed in a prescribed shape such as a dome shape, a flat plate shape, or a cone shape, for example. The diaphragm 31 according to the present embodiment is formed in a dome shape as shown in the figure, and more specifically, is formed in a shape in which the inner peripheral portion 31A is located closer to the sound radiation direction (SD) side than the outer peripheral portion 31B. The surface between the inner peripheral portion 31A and the outer peripheral portion 31B is formed in a curved surface shape (the radial cross-sectional shape is convex).

  Further, as the material for forming the diaphragm 31, for example, a metal material is preferably used as a hard dome material. Specifically, as a material for forming the diaphragm 31, a known diaphragm material such as titanium, magnesium, or aluminum can be employed. Moreover, the material for forming the diaphragm 31 is not limited to the above form, and for example, a ceramic material, a soft dome material, paper, resin, cloth, or the like may be employed.

  As shown in the figure, the diaphragm 31 has an outer peripheral portion 31B coupled to the frame 6 so as to freely vibrate, and an inner peripheral portion 31A is disposed between the support column 4 and the inner peripheral portion 31A, and is also in the radial direction. It is supported on the support column 4 through a ring-shaped inner peripheral edge 35 having a flat cross-sectional shape.

  The diaphragm 31 is provided with a cylindrical voice coil support portion (voice coil bobbin) 33 for supporting the voice coil 32 in the vicinity of the outer peripheral portion. The voice coil 32 is supported by the voice coil bobbin 33. In the illustrated example, the voice coil 32 is provided on the diaphragm 31 via the voice coil bobbin 33. However, the present invention is not limited to this configuration, and the voice coil 32 may be directly fixed to the diaphragm 31. The voice coil 32 is loosely fitted in the magnetic gap 2G of the magnetic circuit 2.

  The outer peripheral side edge (outer peripheral support part) 34 is provided between the outer peripheral part 31 </ b> B of the diaphragm 31 and the frame 6 as shown in the figure. Further, the outer peripheral edge 34 is formed in, for example, a ring shape, and the radial cross-sectional shape is formed in a prescribed shape such as a convex shape, a U shape, or a wave shape. The outer peripheral edge 34 may be made by applying a fine coating on cloth, rubber, urethane foam, leather, or the like. Moreover, as the outer peripheral side edge 34, you may use what applied the damping agent to these materials. The diaphragm 31 according to the present embodiment is supported by the frame 6 through the outer peripheral edge 34 so as to freely vibrate. Further, an annular intermediate member (packing) 36 may be provided between the outer peripheral edge 34 and the frame 6.

  The inner peripheral edge (inner peripheral support portion) 35 supports the inner peripheral portion 31 </ b> A of the diaphragm 31. Specifically, the inner peripheral edge 35 is disposed between the support column 4 and the inner peripheral portion 31 </ b> A of the diaphragm 31. Further, the inner peripheral edge 35 is formed in a ring shape in which the radial cross-sectional shape is formed in a flat plate shape. That is, the vibration plate 31 is supported by the support column 4 through the inner peripheral edge 35 so as to freely vibrate.

  The inner peripheral edge 35 is formed to be deformable with respect to the vibration of the diaphragm. The inner peripheral edge 35 is preferably formed of a material having a larger internal loss than that of the diaphragm 31. For example, the inner edge 35 is formed by applying a crushing coating on cloth, rubber, urethane foam, leather, or a diaphragm. A member having rigidity (Young's modulus) smaller than the member to be used can be employed. The inner peripheral edge 35 according to this embodiment employs a fiber material coated with rubber. Moreover, as the outer peripheral side edge 34, you may use what applied the damping agent to these materials. The inner peripheral edge 35 may be formed of the same material as the outer peripheral edge 34. In this case, the inner peripheral edge 35 can be manufactured at a relatively low manufacturing cost. Thus, by providing the inner peripheral edge 35 formed of a material having a relatively large internal loss, unnecessary vibrations such as resonance and reverse resonance can be reduced.

  Specifically, the inner peripheral edge 35 is a radial cross-sectional flat plate-shaped portion that extends between the inner peripheral portion 31 </ b> A of the diaphragm 31 and the support column 4 along a direction orthogonal to the vibration direction of the voice coil 32. 354. By providing the inner peripheral edge 35 having this shape, the inner peripheral edge 35 has a relatively small vibration range. Moreover, since the vibration range of the inner peripheral edge 35 is relatively small, the overall height of the speaker device 1 can be relatively small.

  More specifically, the inner peripheral edge 35 includes an outer peripheral portion 351, a connecting portion 352, a bent portion 353, a radial cross-section flat plate-shaped portion 354, a joint portion 355, and an inner peripheral portion 356.

  The outer peripheral portion 351 has an outer diameter larger than the inner diameter of the center hole portion 311 of the diaphragm 31. The connecting portion 352 is formed in a cross-sectional shape corresponding to the radial cross-sectional shape of the vibration plate 31 from the bent portion 353 to the outer peripheral portion 351, and is connected to the inner peripheral portion 31 </ b> A of the central hole portion of the vibration plate 31.

  The bent portion 353 is formed at the edge of the radial cross-section flat plate-shaped portion 354. The bent portion 353 according to the present embodiment is formed so as to be positioned on the inner diameter of the center hole portion 311 of the diaphragm 31. Since the inner peripheral edge 35 is joined to the diaphragm 31 by the bent portion 353, the inner peripheral edge 35 can be extended in a direction substantially perpendicular to the vibration direction of the diaphragm 31.

  Further, since the inner peripheral edge 35 has the bent portion 353, the inner peripheral portion of the diaphragm 31 can be provided in the vicinity of the support column 4, and a relatively large effective vibration area can be obtained.

  The radial cross-section flat plate-shaped portion 354 is formed between the joint portion 355 and the bent portion 353 and extends along a direction orthogonal to the vibration direction of the voice coil 32 (the same direction as the acoustic radiation direction SD). The radial cross-sectional shape is formed into a flat plate shape.

  The joint portion 355 is formed on the inner peripheral portion 356 of the inner peripheral edge 35 and is joined to the support column 4. The inner peripheral portion 356 is formed to have an inner diameter smaller than or substantially the same as the outer diameter of the support column 4.

[Post 4]
The support column 4 (diaphragm center support portion) is disposed on the magnetic circuit and extends in the acoustic radiation direction (SD). The support column 4 is supported by constituent members that constitute the magnetic circuit 4. Specifically, the support column 4 is provided on the plate 23 of the magnetic circuit 2. This support | pillar 4 is formed with well-known materials, such as resin, for example.

  In detail, it has column part 41, flat step part 42, leg part 43, flange 45, projection part (upper fitting part) 47, lower fitting part 48, vertical hole 401 (401A, 401B), and horizontal hole 402. . As an example, the column 4 includes a column part 41, a flat step part 42, a leg part 43, a flange 45, a projection part (upper fitting part) 47, a lower fitting part 48, and the like, which are integrally formed of resin. Yes.

The column part 41 is formed in the outer diameter larger than the internal diameter of an inner peripheral support part.
The flat step portion 42 is formed between the column portion 41 and the projection portion 47, and is formed in a flat shape along a direction orthogonal to the axial direction of the support column 4. The inner peripheral edge 35 is connected to the flat step portion 42 in a state where the inner peripheral portion of the inner peripheral edge 35 is fitted to the protrusion 47 of the support column 4.

  The leg portion 43 is formed on the magnetic circuit side of the column portion 41, and a vertical hole 401 and a horizontal hole 402 are formed. More specifically, the leg portion 43 has a plurality of leg portions, specifically, four leg portions 43A, 43B, 43C, and 43D. These leg portions 43A, 43B, 43C, and 43D are joined to the column portion 41 at the top.

  The flange 45 is formed to have an outer diameter larger than the outer diameter of the column portion 41 and the leg portion 42, and the lower fitting portion 48 of the support column 4 is fitted to the central hole portion 230 of the plate 23, and is attached to the plate 23. It is fixed with an adhesive or the like.

  The protruding portion (upper fitting portion) 47 is formed at the tip end portion (acoustic radiation side end portion) of the column portion 4 and is formed to have an outer diameter smaller than or substantially the same as the inner diameter of the inner peripheral edge 35. It is formed in a shape protruding in the acoustic radiation direction from the peripheral part. The protrusion 5 is provided with the equalizer 5.

The column 4 is composed of a column part 41, a flat step part 42, a leg part 43, a flange 45, a projection part (upper fitting part) 47, a lower fitting part 48, and the like, in particular, the inner peripheral edge 35. Can be attenuated in the support column 4.
Further, the inner peripheral edge 35 and the support column 4 are connected via an elastic material such as a thermosetting resin such as an epoxy resin, an acrylic resin or a polyurethane resin, a moisture curable resin, a two-component reactive resin, or other adhesive. Thus, the vibration propagating through the inner peripheral edge 35 and reflected by the support column 4 can be damped by the elastic material, and the reflected vibration can be attenuated again while maintaining a predetermined amplitude. Propagation of the peripheral edge 35 can be suppressed.

  The lower fitting portion 48 is a joint portion to the magnetic circuit 2, and is fitted in the central hole portion 230 of the plate 23 of the magnetic circuit 2 in this embodiment.

  The column 4 has a vertical hole (first hole) 401 formed along the axial direction of the column 4. Further, the support column 4 is formed along a direction orthogonal to the axial direction of the support column 4, and has a horizontal hole (second hole portion) 402 communicating with the vertical hole (first hole portion) 401. For example, as shown in FIG. 14, a plurality of lateral holes (second hole portions) 402 according to the present embodiment are formed in the leg portion 43. Further, the vertical hole 401 includes a vertical hole 401A formed in the pillar portion 41 and a vertical hole 401B formed in the leg portion 43 and having a diameter larger than that of the vertical hole 401A.

Since the column 4 has a columnar shape so as to extend from the magnetic circuit 2 in the acoustic radiation direction, it is possible to suppress the column 4 from vibrating, and unnecessary sound waves can be generated by the column vibrating. Can be prevented from being emitted toward the acoustic radiation direction.
As will be described later, the vertical hole 401 and the horizontal hole 402 of the support column 4 reduce the change in internal pressure (back pressure of the diaphragm 31) in the space (second space) 91 surrounded by the diaphragm 31 and the magnetic circuit 2, and dissipate heat. , Provided for the air passage 900 to the first space 92 (back chamber) and the like.

[Equalizer or lid 5]
The equalizer 5 is provided at the acoustic radiation side end of the support column 4 and reduces the disturbance of the sound pressure frequency characteristic of the sound wave radiated from the diaphragm 31 according to its shape. Further, the equalizer 5 can obtain a desired directivity characteristic of the sound wave emitted from the diaphragm according to the shape thereof.

  The equalizer 5 is disposed on the acoustic radiation side (SD) of the diaphragm 31 and covers at least the radial cross-section flat plate-shaped portion 354 of the inner peripheral edge 35 with a gap between the inner peripheral edge 35 and the specified interval 501. Is formed. Specifically, the equalizer 5 is formed in a substantially conical shape, and the outer peripheral portion of the equalizer 5 is formed to have a larger diameter than the radial cross-section flat plate-shaped portion 354 of the inner peripheral edge 35. Desired acoustic characteristics can be obtained by appropriately setting the diameter, size, gap size, and the like of the equalizer 5.

  For example, when the speaker is driven, unnecessary vibration such as resonance or reverse resonance is reduced by the inner peripheral edge 35. Further, since the equalizer 5 is provided, even if the inner peripheral edge 35 is reversely resonated at a specific frequency due to the gap of the specified interval 501 between the bottom of the equalizer 5 and the inner peripheral edge 35, the inner peripheral side The sound wave emitted from the edge 35 is phase-inverted and overlapped with the sound wave of the diaphragm 31 to obtain flat acoustic characteristics. In addition, since the equalizer 5 is provided, it is possible to prevent unnecessary sound waves emitted from the inner peripheral edge 35 from being emitted toward the user.

Further, in the illustrated example, the equalizer 5 is formed with a fitting portion 52 that is fitted to the protruding portion 47 of the support column 4 on the side opposite to the acoustic radiation side.
Further, the inner peripheral edge 35 is connected to the flat stepped portion 42 by fitting the inner peripheral portion to the protruding portion 47 of the column 4, and the fitting portion 52 of the equalizer 5 and the protruding portion 47 of the column 4 are connected to each other. In the fitted state, it is held between the flat step portion 42 of the support column 4 and the joint portion 53 of the equalizer 5. For this reason, the support | pillar 4 and the inner peripheral edge 35 are joined by comparatively high joint strength.
Further, by providing the equalizer 5 with the fitting portion 52, the vertical hole 401 of the support column 4 can be further increased, the first space 92 can be substantially enlarged, and the acoustic characteristics in the low frequency range are good. It becomes. Further, if necessary, a space (gap) 411 can be formed between the fitting portion 52 of the equalizer 5 and the projection portion 47 of the support column 4 so that the first space 92 can be substantially enlarged, and can be changed as appropriate. be able to.
Further, the equalizer 5 may be used as a lid portion that closes the end portion (acoustic radiation side) of the first hole 401.

  Further, when the speaker is manufactured, the inner peripheral portion of the inner peripheral edge 35 is fitted to the projection 47 of the support column 4 and connected to the flat step portion 42, and then the fitting portion 52 of the equalizer 5 and the projection 47 of the support column 4. And the speaker device according to the present invention can be easily manufactured.

[Frame 6]
The frame 6 is made of a known material such as metal or resin and supports the magnetic circuit 2 and the vibrating body 3. The frame 6 includes a first frame (innermost frame) 61, a second frame (intermediate member) 62, and a third frame (outermost frame) 63. Moreover, it has the support part 64 for supporting the magnetic circuit 2 as needed.

  In the illustrated example, the first frame (innermost frame) 61 is formed in a U-shaped cross section and includes the magnetic circuit 2 therein. Further, the upper end of the first frame 61 and the upper end of the yoke 21 of the magnetic circuit 2 are formed so that a space (first space) 92 is formed between the first frame 61 and the yoke 21 of the magnetic circuit 2. Between the two, an annular second frame (intermediate member) 62 is provided. Further, the first frame 61 may be provided with holes 611 and 612 as necessary. For example, the vent holes 611 and 612 function as vent holes for communicating the frame and the outside.

  When the support portion 64 is provided on the frame 6, as shown in FIGS. 8 and 9, the support portion 64 is provided inside the first frame 61 via a space (first space) 92. That is, a space 92 is formed between the outer surface of the support portion 64 and the inner surface of the first frame 61.

  In the illustrated example, a space (second space) 91 surrounded by the diaphragm 31 and the magnetic circuit 2, and a space (first space) 92 surrounded by the yoke 21 and the frame 61 are the vertical holes 401 of the support column 4. , The horizontal hole 402 and the air passage 900 communicating with each other through the air hole 201 formed in the magnetic circuit 2 are formed. Since the speaker device 1 according to the present embodiment includes the air passage 900, the space (first space) 92 can be used as a back chamber, and the acoustic characteristics in the low sound range are good.

  As described above, the ring-shaped second frame (intermediate member) 62 is provided between the first frame 61 and the magnetic circuit 2, and the outer peripheral edge 34 and the intermediate member (packing) 36 are provided at the upper end portion. The outer peripheral part of the diaphragm 31 is connected so that vibration is possible.

  The third frame (outermost frame) 63 is formed in a substantially cylindrical shape, and is provided on the outer peripheral side in the radial direction from the first frame 61 and the second frame 62. A protection member 7 is provided on the third frame 63.

  The support portion 64 is supported integrally with the second frame 62 or connected to the upper portion of the second frame 62. An opening corresponding to the vent hole 201 is also formed in the support portion 64.

[Protective member 7]
The protection member 7 is provided on the acoustic radiation side of the diaphragm 31 and protects the diaphragm 31, the equalizer 5, and the like. Specifically, the protection member 7 includes a porous metal member 71 and a decoration portion 72.
The porous metal member 71 is formed of, for example, a porous metal plate, and the outer peripheral end is fixed to the third frame 63 of the frame 6. It is provided on the third frame 63 of the frame 6 on the outer side in the radial direction from the decorative portion 72 and the porous metal member 71.
[Sound absorbing member 8]
The sound absorbing member 8 can be disposed in the vent 201 of the magnetic circuit 2 (sound absorbing member 80). The sound absorbing member 8 can be disposed in the space 92 (sound absorbing member 81). The sound absorbing members 80 and 81 may be the integrated sound absorbing member 8 or may be provided separately. Further, the sound absorbing members 8, 80, 81 are arranged so as to cover one end of the vent hole 201 of the magnetic circuit 2.

  These sound absorbing members 8 reduce unnecessary sounds that are reflected / interfered by the air holes 201 and the space 92. The sound absorbing member 8 is made of a known material such as a resin member such as low-foam urethane, artificial leather, cloth, or non-woven fabric.

In such a speaker device 1, for example, when an audio signal is input to the voice coil 32 via a terminal portion (not shown) provided in the frame 6, Lorentz force acts on the voice coil 32 according to the audio signal. Then, the voice coil 32 vibrates by the force. The vibration of the voice coil 32 is transmitted from the outer peripheral portion of the diaphragm 31 to the central portion. In the speaker device 1 according to the present invention, a hole is formed in the central portion of the diaphragm 31, and the inner portion is formed in the hole. Since the diaphragm 31 is supported by the support column 4 via the peripheral edge 35, unnecessary vibrations such as resonance and reverse resonance of the diaphragm can be reduced.
Further, by providing the inner peripheral edge 35 formed of a material having a relatively large internal loss, unnecessary vibration can be reduced.

In the speaker device 1 according to the present invention, the radial cross-sectional shape of the inner peripheral edge 35 is formed in a flat plate shape. For example, the extra length is longer than the inner peripheral edge having a roll-shaped cross-sectional shape. In particular, since the length along the radial direction of the inner peripheral edge 35 is relatively short, unnecessary peak dip in the acoustic characteristics is reduced, and flat acoustic characteristics are obtained from the low range to the high range. Obtainable. That is, it is possible to provide a speaker device with high-quality reproduced sound.
In particular, compared with a general speaker device, the frequency peak of reverse resonance can be set to a higher frequency side, and the acoustic characteristics can be made flat.

[Acoustic characteristics]
FIG. 15 is a diagram for explaining the sound pressure frequency characteristics of the speaker device. In the figure, the vertical axis represents SPL (Sound Pressure Level: unit dB (decibel)), and the horizontal axis represents frequency (unit Hz).

  In the figure, a solid line (EQ) indicates the sound pressure frequency characteristic of the speaker device 1 provided with the equalizer 5, and a dotted line (NOEQ) indicates the sound pressure frequency characteristic of the speaker device 1 when the equalizer 5 is not provided.

In the speaker device 1 not provided with the equalizer 5, a peak is generated in the vicinity of about 15 kHz. However, in the speaker device 1 provided with the equalizer 5, the peak is reduced to have flat acoustic characteristics, and a relatively high-quality reproduced sound is obtained. Can be obtained.
As described above, by providing the equalizer 5 as described above, the inner peripheral edge 35 reversely resonates at a specific frequency due to the gap of the specified interval 501 between the bottom of the equalizer 5 and the inner peripheral edge 35. However, the sound wave emitted from the inner peripheral edge 35 is phase-inverted, and the sound quality is improved due to the superposition with the sound wave of the diaphragm 31.

The speaker device 1 includes a frame 6, a vibrating body 3 supported by the frame 6, a magnetic circuit 2, and a support column 4 that is disposed on the magnetic circuit 2 and extends in the acoustic radiation direction, The vibrating body 3 includes a diaphragm 31, a voice coil 32 that is fixedly attached to the diaphragm 31 and loosely fitted in the magnetic gap 2 </ b> G of the magnetic circuit 2, and an inner peripheral support portion that supports the inner peripheral portion of the diaphragm 31 ( The diaphragm 31 is connected to the frame 6 so that the outer periphery of the diaphragm 31 can vibrate freely. The inner periphery of the diaphragm is located between the support column 4 and the inner periphery. Since it is disposed and supported by the support column 4 via a ring-shaped inner circumferential support portion (inner circumferential side edge 35) having a radial cross-sectional shape formed into a flat plate shape, unnecessary vibration of the diaphragm Can be reduced.
That is, since the diaphragm 31 is supported by the outer peripheral edge 34 and the inner peripheral edge 35 having a cross-sectional flat plate shape so as to freely vibrate, unnecessary vibration of the diaphragm can be reduced, and a relatively high sound quality can be achieved. Can be played.
Moreover, an unnecessary peak dip in acoustic characteristics can be reduced, and a high-quality reproduced sound speaker device can be provided.

  FIG. 16 is an explanatory view showing another embodiment of the present invention (FIG. 16 (a) is a front view, and FIG. 16 (b) is an AA cross-sectional view). In this embodiment, the basic structure is the same as that described above, and the same portions are denoted by the same reference numerals and redundant description is omitted. Here, the frame 6A that supports the magnetic circuit 2 is screwed to the rear frame 6B, and a first space 92 is formed between the frame 6A and the rear frame 6B. The equalizer 5 is attached to the support column 4, a first hole 401 is formed at the center of the equalizer 5, and the first space 92 passes through the vent hole 201 penetrating the magnetic circuit 2 from the first hole 401. Communicating with In addition, a second hole 402 is formed so as to communicate with the first hole 401, and the first space 92 passes through the second hole 402 to the first hole 401 to the ventilation hole 201. It communicates with the first space 92. The rear frame 6B is supported by a support base 65.

  In this embodiment, the equalizer 5 protrudes from the protection member 700 in the acoustic radiation direction. Accordingly, the diaphragm 31 is a ring-shaped diaphragm including an inner peripheral diaphragm 301 and an outer peripheral diaphragm 302. The inner peripheral diaphragm 301 and the outer peripheral diaphragm 302 have different radii of curvature to change their resonance frequencies, and the inner peripheral diaphragm 301 and the outer peripheral diaphragm 302 have the same area, so that the sound pressure levels of both diaphragms are equal. I have to. As a result, the wide range reproduction of the speaker device is enabled.

Claims (23)

A frame, a vibrating body and a magnetic circuit supported by the frame, and a column disposed on the magnetic circuit and extending in the acoustic radiation direction;
The vibrating body includes a diaphragm, and a voice coil fixed to the diaphragm and loosely fitted in a magnetic gap of the magnetic circuit,
In the diaphragm, an outer peripheral part of the diaphragm is connected to the frame so as to freely vibrate, and an inner peripheral part of the diaphragm is supported by the column so as to freely vibrate.
The strut has a first hole formed along the axial direction,
A part of the support column or the magnetic circuit is formed with a second hole portion that is formed along a direction orthogonal to the axial direction and communicates with the first hole portion. Speaker device. The support column includes a protrusion that protrudes in the acoustic radiation direction from the diaphragm,
The speaker device according to claim 1, wherein the first hole extends so as to protrude in an acoustic direction from the diaphragm. A lid having a fitting portion that fits into the protruding portion of the column;
The speaker device according to claim 2, wherein a space communicating with the first hole is formed between the protrusion of the support column and the fitting portion of the lid. A first space surrounded by the magnetic circuit or a support portion supporting the magnetic circuit and an inner surface of the frame is formed in the frame, and a second space surrounded by the magnetic circuit and the diaphragm is formed on the magnetic circuit. The space is formed,
The said 1st space and the said 2nd space are connected via the ventilation hole formed in the said 1st, 2nd hole and the said magnetic circuit, The Claim 1 characterized by the above-mentioned. Speaker device.   The speaker device according to claim 4, wherein a sound absorbing member is disposed in the air hole of the magnetic circuit.   The speaker device according to claim 5, wherein a sound absorbing member that is integral with or separate from the sound absorbing member is disposed in the first space.   The speaker device according to claim 6, wherein the sound absorbing member is disposed so as to cover one end of a vent hole of the magnetic circuit. The column includes a column, a protrusion formed at the upper end of the column, and a leg formed below the column,
The speaker device according to claim 7, wherein the second hole portion is formed in the leg portion. The first hole is formed in the pillar and the leg,
The column part includes a protrusion having a shape protruding in the acoustic radiation direction from the diaphragm,
The speaker device according to claim 8, wherein the first hole extends so as to protrude in an acoustic radiation direction of the diaphragm. A lid having a fitting portion that fits into the protruding portion of the column;
The speaker device according to claim 9, wherein a space is formed between the projecting portion of the support column and the fitting portion of the lid portion. The vibrating body includes an inner peripheral support portion that supports an inner peripheral portion of the diaphragm,
The inner peripheral part of the diaphragm is supported by the support column via the inner peripheral support part,
The speaker device according to claim 1, wherein the second hole portion is formed in the vicinity of the inner peripheral support portion. The support column is supported by a constituent member constituting the magnetic circuit,
The speaker device according to claim 1, wherein the second hole is formed in the vicinity of the magnetic circuit. The column is
A column part having an outer diameter larger than the inner diameter of the inner peripheral support part;
Formed at the tip of the column part, formed to have an outer diameter smaller than or substantially the same as the inner diameter of the inner peripheral support part, and a protruding part having a shape protruding in an acoustic radiation direction from the inner peripheral part of the diaphragm;
A flat step portion having a flat shape formed between the column portion and the projection portion and extending in a direction perpendicular to the axial direction of the support column;
The inner peripheral support portion is connected to the flat stepped portion in a state where the inner peripheral portion of the inner peripheral support portion is fitted to the protruding portion of the support column,
The speaker device according to claim 11, wherein the second hole is formed in a protrusion of the support column. The magnetic circuit includes a plate, a magnet, and a yoke,
The speaker device according to claim 1, wherein the second hole portion is formed in the plate.   The speaker device according to claim 4, wherein the frame has an inclined surface or an uneven surface formed continuously on an outer surface of the support portion or an inner surface of the frame.   The said inner peripheral support part is extended along the direction orthogonal to the vibration direction of the said voice coil between the inner peripheral part of the said diaphragm and the said support | pillar. The speaker device described. The inner periphery support part is
Bends,
A connecting portion that is formed in a cross-sectional shape corresponding to the radial cross-sectional shape of the diaphragm from the bent portion to the outer peripheral portion, and is connected to the inner peripheral portion of the central hole portion of the diaphragm,
A joint portion formed on the inner peripheral portion of the inner peripheral support portion and joined to the support;
The speaker device according to claim 11, further comprising a flat plate-shaped portion in a radial direction formed between the joint portion and the bent portion. It has an equalizer with a fitting part that fits into the protruding part of the column,
The inner peripheral support portion is connected to the flat step portion by fitting an inner peripheral portion to a protrusion of the support column, and is sandwiched between the flat step portion and the equalizer. 13. The speaker device according to 13.   The equalizer is disposed on the acoustic radiation side of the diaphragm, and is formed in a shape that covers at least a radial cross-sectional flat plate-shaped portion of the inner peripheral support portion at a specified interval from the inner peripheral support portion. The speaker device according to claim 18, characterized in that:   2. The speaker device according to claim 1, wherein the diaphragm is formed in a shape in which an inner peripheral portion is positioned closer to an acoustic radiation direction side than an outer peripheral portion, and a surface thereof is formed in a curved shape. The vibrator has an outer periphery support part and a voice coil support part,
The diaphragm is supported by the frame so as to vibrate via the outer periphery support part,
The voice coil is supported by the voice coil support part,
The speaker device according to claim 1, wherein the magnetic circuit includes a plate, a magnet, and a yoke.   The speaker device according to claim 11, wherein the inner peripheral support portion is made of a material having an internal loss larger than that of the diaphragm and is deformable with respect to vibration of the diaphragm.   An automobile comprising the speaker device according to claim 1.

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