JP4560372B2 - Speaker device - Google Patents

Description

  The present invention relates to a speaker device in which an outer periphery of a diaphragm is supported by a speaker frame via an edge having a roll-shaped cross section, and an inner periphery of the diaphragm is supported by the speaker frame via a corrugation damper.

FIG. 1 is a longitudinal sectional view of a conventional speaker device.
The speaker device 1 includes a magnetic circuit 3, a speaker frame 5 to which the magnetic circuit 3 is attached at the rear, a cone-shaped diaphragm 7 in which an edge 9 having a substantially semicircular cross section is continuously provided on the outer periphery, a vibration A cylindrical voice coil bobbin 11 attached to the inner periphery of the plate 7 and a voice coil 12 wound around the voice coil bobbin 11 are provided.

The magnetic circuit 3 includes a yoke 15 having a structure in which a cylindrical center pole 15b protrudes from the center of a disk-shaped plate 15a, a ring-shaped magnet 16 that is loosely fitted on the outer periphery of the center pole 15b, and a plate 15a. And a ring-shaped top plate 17 that is loosely fitted to the front end side of the center pole 15b so as to sandwich the magnet 16 therebetween, and the top plate 17 is fixed to the rear end of the speaker frame 5. Yes.
In the magnetic circuit 3, a gap between the inner periphery of the top plate 17 and the center pole 15b is a magnetic gap in which the voice coil 12 is disposed.

The voice coil bobbin 11 fixed to the inner peripheral edge of the diaphragm 7 is connected to the speaker frame 5 via a corrugation damper 19 having a structure in which crests and troughs are alternately arranged concentrically along the radial direction. The center pole 15b is suspended so as to be movable in the axial direction.
The edge 9 on the outer periphery of the diaphragm 7 supports the diaphragm 7 so as to be capable of swinging by attaching an attachment flange portion 9 a extending to the outer periphery of the diaphragm 7 to the outer periphery 5 a of the speaker frame 5. .
That is, the diaphragm 7 can swing back and forth by connecting the outer peripheral portion to the outer peripheral portion 5 a of the speaker frame 5 via the edge 9 and the inner peripheral portion to the speaker frame 5 via the corrugation damper 19. Is supported elastically.

In such a speaker device 1, ensuring the amplitude symmetry that aligns the forward amplitude and the backward amplitude of the diaphragm 7 is a major factor for improving the sound quality by suppressing the distortion of the speaker. I understand.
Therefore, conventionally, in order to ensure amplitude symmetry, the stiffness and the like of each of the edges 9 and the corrugation damper 19 supporting the diaphragm are adjusted by adjusting the materials used.

However, in the conventional case, the edge 9 has a substantially semicircular cross-section with a constant cross-sectional structure. However, the edge 9 has a laminated structure of different materials to obtain a desired stiffness. Has also been proposed (see, for example, Patent Document 1).
In the case of the corrugation damper 19, as shown in FIG. 2, the bending radius Ry of the peak part and the bending radius Rt of the peak part are set to Ry = Rt, and the height Hy of the undulation of the peak part is In many cases, the height Ht of the undulations of the valleys is set to Hy = Ht, that is, the peaks and valleys are designed symmetrically, but the peaks and valleys at the outer periphery and the inner periphery There has also been proposed a technique in which a desired stiffness is obtained by changing the undulation height and the bending radius R (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 11-187481 JP 2003-37893 A

  However, the edge of the substantially semicircular cross-section with a constant wall thickness has a constant vibration propagation characteristic regardless of whether or not it is a laminated structure of different materials. Although the vibration caused by the sex difference is easy to propagate and is weak, there is a problem that the middle frequency characteristic is easily disturbed by the reverse resonance.

  In addition, the edge of a substantially semicircular cross section with a constant thickness tends to swing backward (downward in FIG. 2). For example, the thickness is uniform and the peaks and valleys are designed symmetrically. When combined with a corrugated damper, the amplitude of the diaphragm has an asymmetric amplitude characteristic that increases the backward amplitude, and the distortion generated in the diaphragm due to the amplitude asymmetry causes the sound quality to deteriorate. It was.

  On the other hand, corrugation dampers with undulation heights and bending radii at the crests and troughs at the outer periphery and inner periphery change the vibration damping performance between the outer periphery and the inner periphery, so that the wall thickness is almost constant. When combined with an edge of a circular cross section, it can be expected to suppress the occurrence of reverse resonance caused by the edge, but the shape of the mold becomes complicated, the moldability is poor, and the product has a stable quality. There was a problem that it was difficult to get.

  As an example (objective) to be solved by the present invention, an example is to provide a speaker device that can improve sound quality by aligning the forward amplitude and the backward amplitude of the diaphragm.

In order to solve the above-described problem, the speaker device according to claim 1 is configured such that the outer peripheral edge of the diaphragm is supported on the outer peripheral portion of the speaker frame via an edge having a substantially semicircular cross section, and side is, in the speaker apparatus is supported by the speaker frame through the corrugation damper structure arranged in peaks and valleys concentrically alternately along the radial direction, portions of the substantially semicircular cross-section of the edge, the vibration The corrugation damper has an uneven thickness structure in which the wall thickness gradually decreases from the affixed portion on the outer periphery of the plate toward the affixed portion on the outer peripheral portion of the frame. Rt is set such that Ry <Rt .

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a speaker device according to the invention will be described in detail with reference to the drawings.
3 to 5 show an embodiment of the speaker device according to the present invention, FIG. 3 is a longitudinal sectional view of the embodiment of the speaker device according to the present invention, and FIG. 4 is the speaker device of FIG. FIG. 5 is an enlarged sectional view of an edge of the speaker device of FIG. 3.

  The speaker device 31 according to this embodiment includes a magnetic circuit 3, a speaker frame 33 to which the magnetic circuit 3 is attached at the rear, and a cone-shaped vibration in which an edge 35 having a substantially semicircular cross section is continuously provided on the outer periphery. The configuration includes a plate 37, a cylindrical voice coil bobbin 11 attached to the inner periphery of the diaphragm 37, and a voice coil 12 wound around the voice coil bobbin 11.

The magnetic circuit 3 includes a yoke 15 having a structure in which a cylindrical center pole 15b protrudes from the center of a disk-shaped plate 15a, a ring-shaped magnet 16 that is loosely fitted on the outer periphery of the center pole 15b, and a plate 15a. And a ring-shaped top plate 17 that is loosely fitted to the front end side of the center pole 15b so as to sandwich the magnet 16 therebetween, and the top plate 17 is fixed to the rear end of the speaker frame 33. Yes.
In the magnetic circuit 3, a gap between the inner periphery of the top plate 17 and the center pole 15b is a magnetic gap in which the voice coil 12 is disposed.

  The voice coil bobbin 11 fixed to the inner peripheral edge of the diaphragm 37 is connected to the speaker frame 33 via a corrugation damper 39 in which peaks and valleys are alternately arranged concentrically along the radial direction. It is suspended so as to be movable in the axial direction of the pole 15b.

In the corrugation damper 39, as shown in FIG. 4, the bending radius Ry of the peak part and the bending radius Rt of the peak part of the valley are set to Ry <Rt.
Furthermore, the undulation height Hy of the mountain portion and the undulation height Ht of the valley portion may be set to Hy <Ht.

Further, as shown in FIG. 5, the edge 35 has an outer periphery of the speaker frame 33 in which a mounting flange portion 35 a extending to the outer peripheral edge extends outside the speaker mounting opening diameter d <b> 1 of the speaker mounting plate 21. The mounting flange portion 35a is clamped by the resin packing 47 that is adhered to the portion 33a and fixed to the outer peripheral portion 33a, and is fixed to the outer peripheral portion 33a.
A flange portion 35 b extending to the inner peripheral edge of the edge 35 is bonded and integrated with the back surface of the diaphragm 37.

As shown in FIG. 5, the portion 35c having a substantially semicircular cross section of the edge 35 has an uneven thickness structure in which the thickness gradually decreases from the attaching portion on the outer periphery of the diaphragm toward the attaching portion to the frame outer peripheral portion 33a. Has been.
Therefore, t1> t2, where t1 is the thickness in the vicinity of the attachment portion on the outer periphery of the diaphragm, and t2 is the thickness in the vicinity of the attachment portion to the frame outer periphery 33a.

  As described above, in the speaker device 31 according to the embodiment of the present invention, the propagation characteristics of the vibration on the edge of the substantially semicircular cross section are not uniform, and various vibrations are generated according to changes in the wall thickness. Since the vibration damping effect is exhibited with respect to the frequency, the vibration propagated from the diaphragm 37 can be efficiently attenuated, and the vibration can be prevented from returning from the edge 35 to the diaphragm 37. Therefore, it is possible to prevent the mid-range characteristics from being disturbed by reverse resonance from the edge 35, and to improve the mid-range characteristics. Furthermore, the resonance of the fuselage, particularly the noise at the outer periphery of the fuselage, can be suppressed by the uneven thickness edge, and the mid-range characteristics can be improved.

Moreover, in the speaker apparatus 31 of the said embodiment, since the peak part and trough part of the corrugation damper 39 are asymmetrical shape, compared with the conventional thing by which the peak part and trough part were designed symmetrically. The damper 39 itself has an amplitude characteristic that tends to swing forward.
Therefore, in the case of the above configuration combined with the edge 35 having a substantially semicircular cross section, the corrugation damper 39 cancels out the characteristic that the edge 35 having a substantially semicircular cross section is easily oscillated backward, and the amplitude is applied to the diaphragm 37. Symmetry can be ensured. Therefore, in addition to the above-described improvement of the mid-range characteristics, the occurrence of distortion due to amplitude asymmetry is suppressed, and the sound quality can be further improved.

  Further, the corrugation damper 39 used in the speaker device 31 has a molding die compared to a conventional corrugation damper in which the undulation height and the bending radius R of the ridges and valleys are changed at the outer peripheral part and the inner peripheral part. Since the structure with the same unevenness | corrugation may be sufficient, the shape of a shaping die is simplified. Therefore, the moldability of the corrugation damper is improved, a product with stable quality can be easily obtained, and the manufacturing cost can be reduced.

It is a longitudinal cross-sectional view of the conventional speaker apparatus. It is an expanded sectional view of the corrugation damper of the speaker apparatus of FIG. 1 is a longitudinal sectional view of an embodiment of a speaker device according to the present invention. It is an expanded sectional view of the corrugation damper of the speaker apparatus of FIG. It is an expanded sectional view of the edge of the speaker apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Magnetic circuit 21 Speaker mounting plate 31 Speaker apparatus 33 Speaker frame 33a Outer peripheral part 35 Edge 35a Mounting flange part 37 Diaphragm 39 Corrugation damper 47 Resin packing

Claims (2)

The outer peripheral edge of the diaphragm is supported on the outer periphery of the speaker frame through an edge of a substantially semicircular cross section, and the inner peripheral side of the diaphragm is concentrically alternately along the radial direction. In a speaker device supported by a speaker frame via a corrugation damper having a structure aligned with
The portion of the substantially semicircular cross-section of the edge is an uneven thickness structure in which the thickness gradually decreases from the attaching portion on the outer periphery of the diaphragm toward the attaching portion on the outer periphery of the frame ,
In the corrugation damper, the bending radius Ry at the top of the peak and the bending radius Rt at the top of the trough are set to Ry <Rt . 2. The speaker device according to claim 1 , wherein the corrugation damper is configured such that a undulation height Hy of a mountain portion and a undulation height Ht of a valley portion are set to Hy <Ht.

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