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JP2006203490

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2006203490
The present invention relates to a speaker using a non-circular diaphragm such as an elliptical
shape among speakers used in various types of audio equipment, and it is an object of the
present invention to provide a speaker with low distortion acoustic characteristics. is there. A
speaker according to the present invention has substantially the same width speaker edge 2A of
an elliptical speaker in the same shape in a cross section along an arbitrary straight line passing
through the center of a voice coil, and the speakers of the arbitrary straight line mutually By
changing the thickness of the edge 2A to equalize the holding power of the drive system
including the speaker diaphragm 1, it is possible to provide a speaker with excellent acoustic
characteristics with less distortion. [Selected figure] Figure 1
スピーカ
[0001]
The present invention relates to a speaker used for various audio devices.
[0002]
An elliptical speaker which is a typical non-circular representative example will be described with
reference to a cross-sectional view for explaining both the short diameter and the long diameter
in FIG.
The speakers were configured as described below.
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1
[0003]
In the figure, 1 is an elliptical diaphragm, 2 is a speaker edge affixed to the outer periphery of the
diaphragm 1, 3 is a voice coil secured to the central portion of the diaphragm 1, and 4 is a
magnetic circuit. An annular magnet 4c and an upper plate 4d are adhesively fixed on the lower
plate 4b. 4 a is a magnetic gap provided in the magnetic circuit 4.
[0004]
A frame 5 has a bottom fixed to the upper plate 4d, and the diaphragm main body 1 adheres the
outer periphery to the frame 5 through the speaker edge 2 attached to the outer periphery. .
[0005]
A damper 6 adheres the outer periphery to the frame 5 and the inner periphery to the voice coil
3 so that the coil of the voice coil 3 can move up and down in the magnetic gap 4a.
[0006]
Reference numeral 7 denotes a dust cap mounted on the voice coil 3.
[0007]
Next, the operation of the speaker will be described. First, an electric signal is externally applied
to the voice coil 3 from the outside (not shown), and the voice coil 3 held in the magnetic gap 4a
of the magnetic circuit 4 is vertically moved. By vibrating and transmitting to the diaphragm 1
coupled to the voice coil 3, the air is vibrated to emit sound.
The speaker edge 2 supports the diaphragm 1 and also has a function of controlling the
movement of the diaphragm 1.
Therefore, the performance of the speaker is affected by the performance of the speaker edge 2.
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2
[0008]
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known.
Japanese Patent Application Laid-Open No. 7-46690
[0009]
In the above-described conventional configuration, the speaker edge is partially the same in
width along the entire circumference and is made of the material having the same thickness, and
when viewed partially, the stiffness (ease of movement) is equal.
[0010]
However, in the non-circular diaphragm 1 such as an oval, the distance from the voice coil 3 to
the speaker edge 2 is different, and the force transmitted from the voice coil 3 to the diaphragm
1 is uneven.
As a result, the supporting force of the entire circumference of the diaphragm 1 becomes
unbalanced, and the up and down movement of the diaphragm 1 can not be performed smoothly.
In addition, stress is generated in the diaphragm 1, which causes distortion.
[0011]
The present invention solves such a problem, and provides an excellent speaker by a speaker
edge that can be supported with an isotropically uniform holding power centering on a voice coil
over the entire circumference of a non-circular diaphragm. It is.
[0012]
In order to achieve the above object, the speaker of the present invention is centered on a voice
coil as a driving source, and the shape of the speaker edge is the same when viewed from the
center, and the distance from the voice coil to the speaker edge and the diaphragm By changing
the thickness of the speaker edge in consideration of the stiffness of itself, the diaphragm can be
supported with isotropically uniform holding power regardless of the magnitude of the
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3
amplitude.
[0013]
As described above, according to the present invention, the shape of the speaker edge coupled to
the outer periphery of the non-circular diaphragm is the same shape as viewed from the voice
coil, and is constituted by the diaphragm and the speaker edge By setting the thickness of the
speaker edge so that the stiffness of vibration-based components is isotropically the same, an
excellent speaker with less distortion is provided.
[0014]
Hereinafter, an embodiment of the speaker of the present invention will be described with
reference to FIGS. 1 (a) to 1 (d).
In the description, the same parts as in the prior art will be assigned the same reference
numerals and explanations thereof will be omitted.
[0015]
Embodiment 1 FIG. 1 shows a speaker diaphragm of an elliptical speaker which is an essential
part of an embodiment of a speaker according to the present invention, and FIG. 1 (a) is a plan
view, FIG. 1 (b) is 1 (a), FIG. 1 (c) is a cross-sectional view taken along the line BB 'in FIG. 1 (a),
and FIG. 1 (d) is a line C- in FIG. 1 (a). It is a C 'sectional view.
[0016]
Referring to this figure, only differences from the prior art will be described. 2A is a speaker
edge, and the cross section when cut by an arbitrary straight line passing through the center of
voice coil 3 has the same left and right shape. When vertically moved as the center, the stiffness
is changed to change the thickness so that the supporting force is balanced.
[0017]
This will be described with reference to FIG. 1. The cross section of the edge portion 2b of the
cross section in the major axis direction of the diaphragm 1 (BB 'cross section in FIG. 1A (FIG. 1C)
and the minor axis direction of the diaphragm 1 ( A cross-section between the edge portion 2a of
the AA 'cross section of FIG. 1A (FIG. 1B) and the long and short diameter of the diaphragm 1 (C-
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C' cross section of FIG. The respective thicknesses of the edge portion 2c of (d) are in a
relationship of 2a> 2c> 2b.
[0018]
That is, on the side of the major axis direction BB 'of the diaphragm 1, the thickness of the edge
portion 2b is reduced so that the stiffness of the speaker edge is reduced because the component
of the driving force is reduced On the short diameter side, the component of the driving force is
increased, and the stiffness is also increased accordingly to increase the thickness accordingly,
and the component of the driving force from the voice coil 3 is provided over the entire
circumference. Since the structure is made to have the corresponding stiffness, the displacement
of the diaphragm 1 as a whole is the same, and vibration with less distortion is possible.
[0019]
By making the shapes of the edges the same, the tendency of deformation of the edges is also the
same, and it is possible to make the supporting force applied all around the diaphragm 1 and the
speaker edge 2A regardless of the amplitude.
Furthermore, the material of the diaphragm 1 is generally a thin material, and it is necessary to
consider its own deformation.
The distortion can be further reduced by combining the stiffness of the diaphragm 1 and the
stiffness of the speaker edge 2A so as to be isotropically uniform.
[0020]
Furthermore, in addition to adjusting the stiffness by increasing or decreasing the thickness of
the speaker edge 2A, it may be realized by the material of the speaker edge, the molding
conditions, etc., and similar effects can be obtained. Adjustment is complicated.
[0021]
Although the above embodiment has been described with respect to the speaker edge (free edge)
bonded to the diaphragm, it can be applied to a fixed edge in which the speaker edge is integrally
molded with the diaphragm.
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[0022]
The speaker of the present invention can reduce distortion with respect to a non-circular speaker
such as an oval, and is useful as a high-quality speaker.
[0023]
(A) A plan view of a speaker diaphragm of an elliptical speaker which is an essential part of an
embodiment of the speaker according to the present invention, (b) a sectional view taken along
the line AA 'in FIG. 1 (a), (c) the same 1 (a) is a cross-sectional view taken along the line BB ', and
(d) is a cross-sectional view taken along the line CC' shown in FIG. 1 (a).
Explanation of sign
[0024]
1 diaphragm 2A (2a, 2b, 2c) edge for speaker 3 voice coil 4 magnetic circuit
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