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JPH03203499

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DESCRIPTION JPH03203499
[0001]
Field of the Invention The present invention relates to a speaker used for audio equipment for
music reproduction used in many other fields such as Hi-Fi and vehicles. Conventionally, in a
diaphragm constituting a speaker, the gap between the vibrating surface and the inner diameter
of the edge roll may be widened, and edge resonance may be used to improve the frequency
characteristic of the speaker. 6 and FIG. 6 show a plan view and a cross-sectional view of this
prior art example. Here, 31 is a bottom plate, 32 is a magnet, 33 is a top plate 1 / 1-134 is a
frame, 36 is a diaphragm, 36 is a voice coil, 37 hassuspensions, asid subcone, 39 is a diaphragm
36 vibration It is an expanded gap between the out-of-plane diameter and the inner diameter of
the edge roll. As described above, by widening the gap 39 between the outer diameter of the
diaphragm 36 and the inner diameter of the edge roll, the depth and frequency range of the edge
resonance are broadened, and a sound pressure dip can be made in the middle range. Therefore,
a speaker having a sound pressure peak in the midrange can flatten the frequency characteristics
in this way. However, in the speaker using the elliptical diaphragm, even if the gap between the
outer diameter of the vibration surface and the inner diameter of the edge roll is widened as
described above, the radius always changes, so the edge resonance is dispersed. Can not be
controlled like a circular speaker. In addition, since the angle of the outer peripheral end is close
to horizontal with respect to the major axis direction of the elliptical vibrating surface as
compared with the minor axis direction, there is a problem that the dip is concentrated at the
wavelength of the wavelength determined by the major axis. An object of the present invention is
to provide a speaker which can freely control the edge resonance of the above-mentioned
elliptical diaphragm and control the frequency characteristic. Means for Solving the Problems In
order to solve the above problems, the present invention is configured to make the gap between
the outer diameter of the vibration surface of the elliptical diaphragm and the inner diameter of
the edge roll different in the major axis direction and the minor axis direction. According to the
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above means, it is possible to concentrate the edge resonance to the one where the gap between
the vibrating surface outer diameter and the inner diameter of the edge roll is wide, and from the
wavelength determined by the major axis or the wavelength determined by the minor axis It can
be selected. Embodiment 1 FIGS. 1 and 2 show a plan view and a sectional view of a speaker
according to a first embodiment of the present invention. Here, 1 is a bottom plate having a
center ball, 2 is a ring magnet, 3 is a ring top plate, and the bottom plate 1 and the magnet 2 top
plate 3 constitute a magnetic circuit. 4 is a frame, 6 is an elliptical diaphragm, 6 is a voice coil
coupled to the central portion of the elliptical diaphragm 6, 7 is a suspension for supporting the
middle portion of the voice coil 6, and 8 is coupled to the upper end of the voice coil 6. The sub
cone 9 is the gap between the outer diameter of the vibration surface of the elliptical diaphragm
5 and the inner diameter of the inner diameter of the edge roll 11 and the gap 1Q is the gap
between the outer diameter of the vibration surface of the elliptical disk 5 and the inner diameter
of the edge roll 11 is there.
In the present embodiment, for a 6.6 inch О 7.5 inch elliptical speaker, the gap 9 in the major
axis direction is the minimum play necessary for edge bonding, and the gap 10 in the minor axis
direction is positively expanded. There is. By this, it is possible to increase the edge resonance at
the frequency by the short diameter wavelength without increasing the edge resonance at the
frequency by the long diameter wavelength, and to provide gaps intensively at the position of the
short diameter, the resonance The dip effect is large. In the experiment, the gap 1o in the minor
axis direction was effective in two or more battles, and the optimum value was obtained at 6 to 6
degrees. However, care must be taken because over-spreading causes rolling. If the relationship
between the gaps in the major axis direction and the minor axis direction is reversed, it is
possible to increase the edge resonance at the frequency of the wavelength of the major axis. 3
and 4 are a plan view and a cross-sectional view of a loudspeaker according to a second
embodiment of the present invention. In FIGS. 3 and 4, the same parts as those shown in FIGS. 1
and 2 are designated by the same reference numerals and the description thereof will be omitted.
Here, 4 is a frame, 6 is a rectangular diaphragm, 9 is a gap in the major axis direction, and 1Q is
a gap in the minor axis direction. In the present embodiment, the diaphragm in the first
embodiment is changed from an ellipse to a square (track ellipse), and the operation and effects
according to the first embodiment can be obtained. According to the effect portion of the
invention, the present invention inserts the voice coil into the magnetic gap of the magnetic
circuit fixed to the frame, and sequentially couples the suspension and the elliptical or square
diaphragm fixed to the frame to the voice coil. The following effects can be obtained by making
the gap between the vibration surface outer diameter of the elliptical diaphragm and the inner
diameter of the edge roll different in the major axis direction and the minor axis direction. (1) In
the elliptical speaker in which the edge resonance is easily dispersed, the control effect of the
edge resonance by the gap expansion between the vibration surface and the edge roll is
improved. (2) It is possible to control the edge resonance dip independently with the frequency
according to the wavelength of the major axis of the diaphragm and the frequency according to
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the wavelength of the minor axis, and it becomes possible to make finer frequency characteristic
correction compared to the prior art. (3) Furthermore, since the present invention can be
implemented with only the die of the diaphragm, the cost does not increase, and mass
productivity is high.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a plan view of a speaker according to a first embodiment of the present invention, FIG. 2
is a cross-sectional view taken along line X--Y of FIG. 1, and FIG. 3 is a second embodiment of the
present invention. 4 is a cross-sectional view taken along the line X-O-Y in FIG. 3, FIG. 6 is a plan
view of spy force in the prior art, and FIG. 6 is x-o-y in FIG. It is a sectional view in a section.
DESCRIPTION OF SYMBOLS 1 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии и , 6 и и и и и и Voice coil и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и ...
A gap in the minor axis direction between the vibration surface outer diameter of the diaphragm
6 and the inner diameter of the edge roll.
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