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JPH06351096

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Notice
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DESCRIPTION JPH06351096
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker for use in various audio equipment, video equipment, communication equipment, invehicle audio equipment, audio equipment and the like.
[0002]
2. Description of the Related Art In recent years, in the audio industry, particularly in the field of
video equipment, there is a high demand for space saving, high design and high performance,
and a wide variety of demands are also made for speakers used for them. It has become. Among
them, the development of speakers using an elliptical diaphragm coming from the design side
and the space saving side is steadily increasing.
[0003]
A conventional loudspeaker will be described below with reference to the drawings. A
conventional speaker of this type has a configuration as shown in FIG. 7, and FIG. 7 shows the
half cross sections of the elliptical speaker in the major axis direction and the minor axis
direction. In FIG. 7, a magnetic circuit is formed by connecting the lower plate 1 provided with
the center pole, the ring-shaped main magnet 3 and the ring-shaped upper plate 2 in a laminated
state, and the main magnet 3 is formed under the magnetic circuit. A low leakage type magnetic
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circuit is formed by the ring-shaped cancel magnet 4 magnetized in the reverse direction and the
shield cover 5 covering the entire magnetic circuit.
[0004]
A frame 6 is coupled to the upper surface of the magnetic circuit, and the intermediate portion of
the bobbin is held by a damper 8 so that the voice coil 7 is properly fitted into the magnetic gap
of the magnetic circuit. Is fixed to the frame 6 through the voice coil 7 in the center hole of the
diaphragm 9 and to the frame 6 together with the gasket 13 via the edge 12 of the peripheral
edge of the diaphragm 9, and the peripheral edge of the diaphragm 9 is the edge 12 The large
diameter side is made into 11 and the short diameter side is made into 10, A is shown on the
short diameter side and B is shown on the long diameter side. Further, a dust cap 14 is attached
to the central upper surface of the diaphragm 9.
[0005]
However, in the above-described conventional configuration, as shown in FIG. 8, when an input is
applied to the speaker and a driving force is generated in the voice coil 7, the force is transmitted
through the bobbin of the voice coil 7 and vibrates. Although the plate 9 is driven, when the
speaker operates in this manner, the peripheral portion 10 of the diaphragm 9 has a discrete
shape which is further extended in the outer peripheral direction from the boundary line 15 with
the edge 12 and therefore The peripheral portion 10 induces a bird's wing-like split vibration
which causes cantilever resonance and a joint driving phenomenon, and a radial resonance wave
C due to the amplitude of the diaphragm 9 is propagated from the boundary line 15 to become C
', causing harmonic distortion significantly It was increased or disturbed, adversely affecting the
speaker characteristics. Furthermore, the peripheral portion 10 floats from the boundary line 15
of the diaphragm 9, which is a node of the amplitude, so it is weak to vibration and causes
deterioration of sound quality such as chatter and distortion in strength and rigidity. The
[0006]
The present invention solves the above-mentioned conventional problems, suppresses the bird's
wing-like split vibration which is likely to be generated in the elliptical diaphragm during the
operation of the speaker, and prevents the increase of the harmonic distortion to freely increase
the high frequency limit frequency characteristics and high. It is an object of the present
invention to provide a speaker capable of controlling the sound pressure level in the range and
realizing low distortion.
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[0007]
SUMMARY OF THE INVENTION In order to solve this problem, the speaker according to the
present invention extends the peripheral portion of an elliptical diaphragm from the connecting
portion with the inner peripheral side of the edge in the outer peripheral direction, and The
peripheral edge of the diaphragm is configured such that the major axis is curved toward the
front and the minor axis is curved toward the rear, and the voice coil is coupled to the center of
the diaphragm and the voice coil is coupled to the frame on the top It is fitted in a magnetic gap
formed in the circuit, and the outer periphery of the edge is coupled to the peripheral edge of the
frame.
[0008]
With this configuration, the peripheral edge portions curved in different directions on the long
diameter side and the short diameter side of the diaphragm increase rigidity and operate
cantilever resonance, so that a bird wing-shaped division tends to occur in the elliptical
diaphragm Vibration can be suppressed and increase in harmonic distortion can be prevented.
Furthermore, by changing the size of the curved peripheral end portion on the long diameter side
and the short diameter side, the high frequency limit frequency characteristic and the high sound
pressure level can be freely controlled, and low distortion can be realized. Can.
[0009]
DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of
the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing the structure of the loudspeaker according to the
embodiment, and FIG. 2 is a plan view thereof. FIG. 1 is a diagram in which each half cross
section in the major axis direction and the minor axis direction of the elliptical speaker is
described.
[0010]
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In FIG. 1 and FIG. 2, a magnetic circuit is formed by connecting the lower plate 16 with the
center pole, the ring-shaped main magnet 18 and the ring-shaped upper plate 17 in a stacked
state. A low leakage type magnetic circuit is formed by coupling a ring-shaped cancel magnet 19
magnetized in the reverse direction to the main magnet 18 and a shield cover 20 covering the
entire magnetic circuit. A frame 21 is coupled to the upper surface of the magnetic circuit, and
the intermediate portion of the bobbin is held by a damper 23 so that the voice coil 22 is
properly fitted into the magnetic gap of the magnetic circuit. The voice coil 22 is fixed to the
center hole of the diaphragm 24 and is fixed to the frame 21 together with the gasket 29
through the edge 28 of the peripheral portion of the diaphragm 24 and further to the center
upper surface of the diaphragm 24. The dust cap 30 is stuck and comprised.
[0011]
The diaphragm 24 is formed in an elliptical shape, and the peripheral edge is further extended in
the outer peripheral direction from the joint portion with the inner peripheral side of the edge
28, so-called generally discrete type. The peripheral edge 27 on the longer diameter side is
curved in the front direction, and the peripheral edge 26 on the shorter side is curved in the rear
direction, and the connecting portions 37 on the longer diameter side and the shorter diameter
side are peripheral edge portions It is comprised so that it may change gradually from the front
direction of 27 to the back surface direction of the peripheral edge part 26. As shown in FIG.
[0012]
The operation of the loudspeaker according to this embodiment configured as described above
will be described below with reference to FIG.
First, when an input is applied to the speaker and a driving force is generated in the voice coil 22,
the force is transmitted through the bobbin of the voice coil 22 to cause the diaphragm 24 to
oscillate, and a movement that disturbs this operation is also generated. The peripheral edge 25
and the edge 28 of the outer diaphragm 24 cause resonance from the boundary line 31, and the
radiation resonance or cantilever resonance wave D generated here is transmitted to the
peripheral edge 27 with an increase over the second boundary line 32. Do. However, on the large
diameter side, the curved shape toward the front surface formed at the peripheral edge 27
enhances the rigidity, suppresses the bird-wing-like split vibration that is likely to occur in the
elliptical diaphragm, and controls the cantilever resonance of the peripheral region 25
Attenuated resonance wave E is obtained, and the high limit frequency characteristic and the
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high sound pressure level can be improved, and low distortion can be realized.
[0013]
Similarly, on the minor axis side, the curved shape to the rear surface formed at the peripheral
edge portion 26 achieves a synergetic effect with the shape on the major axis side, and
attenuates the uniform resonance wave F which tries to cancel split resonance and spread all
over. Can be a resonant wave G that has been attenuated. As a result, by changing the size of the
peripheral edge portions 26, 27, the high frequency limit frequency characteristic and the high
sound pressure level can be freely controlled, and the low frequency fo can be lowered, and the
radiation resonance of the edge 28 Harmonic distortion can be reduced by reducing the
[0014]
Such characteristics of reproduction frequency characteristics and harmonic distortion of the
speaker in the present embodiment and the same characteristics of the conventional speaker are
shown in comparison with FIG.
[0015]
As apparent from FIG. 4, the loudspeaker according to the present invention can suppress the
peak dip characteristic of the high frequency band limit frequency characteristic of 2 KHz or
more, secure the high sound pressure level, and reduce the peak dip. It is possible to achieve an
improvement in speech intelligibility and a characteristic with less distortion that could not be
realized in the prior art, and to realize a reproduction frequency characteristic that is flat as a
whole.
[0016]
(Embodiment 2) The second embodiment of the present invention will be described below with
reference to the drawings.
FIG. 5 is a plan view showing the loudspeaker according to the embodiment. The loudspeaker
according to the present embodiment differs from the first embodiment in the shape of the
diaphragm 37, and the diaphragm 37 is a straight line facing the short diameter side In the same
manner as in the first embodiment, the peripheral portion of the diaphragm 37 is further
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extended in the outer peripheral direction from the connecting portion with the inner peripheral
side of the edge 41, as in the first embodiment. The peripheral edge 39 on the major axis side of
the diaphragm 37 is curved in the front direction, and the peripheral edge 38 on the minor axis
side is curved in the rear surface direction, and the direction is gradually changed in each
connecting part 40, The diaphragm 37 is coupled to the frame 42 together with the gasket 43.
[0017]
The other configurations and effects are the same as those of the first embodiment, and the
detailed description is omitted. However, when the track-type elliptical diaphragm according to
the present embodiment is used, the first embodiment is more Even more remarkable effects can
be obtained.
[0018]
(Third Embodiment) The third embodiment of the present invention will be described below with
reference to the drawings.
FIG. 6 is a plan view showing the loudspeaker according to the embodiment. The loudspeaker
according to the present embodiment differs from the first and second embodiments in the shape
of the diaphragm 44, and the diaphragm 44 has a corner portion In the same manner as in the
first and second embodiments, the peripheral portion of the diaphragm 44 is further extended in
the outer peripheral direction from the connecting portion with the inner peripheral side of the
edge 48, and The peripheral edge 46 on the long diameter side of the diaphragm 44 is curved in
the front direction, and the peripheral edge 45 on the short diameter side is curved in the rear
direction, and the direction is gradually changed by each connecting portion 47, The diaphragm
44 is coupled to the frame 49 together with the gasket 50.
[0019]
The other configurations and effects are the same as those of the first and second embodiments,
and the detailed description is omitted. However, when the elliptical diaphragm according to the
present embodiment is used, the first and the sixth embodiments are described. A more
remarkable effect can be obtained than the two embodiments.
[0020]
In the first to third embodiments, the bending direction of the peripheral edge of the diaphragms
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24, 37, 44 is the front direction on the long side 27, 39, 46, and the rear direction on the short
side 26, 38, 45 Although the effect is obtained to some extent by reversing this relation, the
relation of the present embodiment can obtain a more remarkable effect.
[0021]
As described above, the loudspeaker according to the present invention realizes flattening by
suppressing the deviation of the reproduction frequency characteristic of 2 KHz or more
necessary for the clarity of the voice, and has a bird's wing shape that tends to be generated on
an elliptical diaphragm. It suppresses split vibration, enables excellent sound quality with less
distortion, and can easily control the high-range sound pressure level that could not be achieved
conventionally, and can not only expand the reproduction frequency band, but also vibrate By
enhancing the rigidity of the peripheral edge of the plate, it is possible to realize an excellent
speaker with high input resistance and high power linearity.
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