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Specification 10 Title of Invention
3. Detailed Description of the Invention The present invention relates to a double cone speaker in
which a sub cone is disposed non-concentrically with respect to a main cone. In conventional
double cone speakers, since the sub cones are arranged concentrically to the main cone, the
sound radiated from each cone interferes with each other, and the reproduction characteristic is
It has all the disadvantages of deterioration. And in order to prevent the above-mentioned
interference and to eliminate the above-mentioned fault, although it is set as the structure of
sticking and arranging a sound absorbing material on each cone etc., if it does in this way, the
above-mentioned interference can be prevented. The vibration characteristics of the above
change, and it is impossible to obtain desirable reproduction characteristics. Further, the double
cone speaker system having a structure designed to prevent the deterioration of the reproduction
characteristics due to the above-mentioned interference, and the main cone and the sub cone are
driven by the respective speaker units, and the sub cone is made to the main cone There are
some which are arranged in a non-concentric manner, but in the double-cone loudspeakers of
such a structure, each individual loudspeaker unit is necessary, so that it is not only structurally
complex but expensive. In addition, each unit has to be operated to adjust the sound quality of
the emitted sound, and there is a disadvantage that the adjustment requires time and effort.
EndPage: 1 The present invention therefore relates to a drive cone having a main cone having a
substantially oval drive circumferential portion at the center of the main body, and any one of the
circumferential portions in the major axis direction on the substantially oval. And at least one
sub-cone having a part, and a two-point drive drive for driving each circumference in the long
sleeve direction on the substantially oval, the non-concentrically disposed main cone and sub
cone being the drive Formed to be driven by? It is an object of the present invention to provide a
double cone speaker having good reproduction characteristics by solving all the disadvantages of
the prior art as described above by making it i-characteristic. Hereinafter, the present invention
will be described in detail with reference to the drawings showing an embodiment. A plan view of
an embodiment of the present invention is shown in FIG. 1, and an XX sectional view and a Y-X
sectional view in FIG. 1 are shown in FIG. 2 and FIG. In the figure, the outer periphery of the main
cone 1 is fixed to the frame 3 through the wavy edge 2, and the first and second bobbins 4, 5 are
substantially long at the center (top) thereof. A circular drive circumferential portion 6 and an
opening 9 formed by the respective coil bobbins 4 and 5 and the drive circumferential portion 6
are closed by a viscoelastic substance film.
Further, the main cord 71 is a wall in which a half apex angle θ □ of a wall (referred to as a first
wall) 10 on the major axis direction of the substantially oval drive circumferential part 6 is on the
minor axis direction. A half apex angle e2 of a portion (referred to as a second wall portion) 11
(approximately equal to a half apex angle of a general cone). It is formed to be smaller than).
Furthermore, the subcone 20 is fixed to the first coil bobbin 4 at its top. That is, the sub cone 20
is formed with a circular drive circumferential portion 20 a at the center thereof, and the drive
circumferential portion 20 a is in the major axis direction on the substantially oval shape of the
drive circumferential portion 6 of the main cone 1. It is connected to a certain circumferential
portion 7. The coiled bobbins 4, 5 disposed at the central portion of the main cord 71 as
described above are supported by the frame 3 via the damper 12, and the voice coils 13, 14 are
wound around the outer peripheral portion thereof. It is done. Furthermore, the first and second
poles 18.19 fixed to the ends of the magnets 16.17 disposed non-concentricly in the yoke 15 are
respectively inserted into the coil bobbins 4 and 5 described above. Thus, a two-point drive drive
unit 21 is formed. The yoke 15tri is fixed to the frame 3. Here, when mounting VC of each of the
coil bobbins 4 and 5 described above, a portion in contact with the wall portion 10 having a
small half apex angle θ is fixed, and the other portion is supported by a viscoelastic material. .
Also, the above sub-cone 20 is set to have a small half apex angle so that it can be reproduced or
not sufficient in the high range. In the embodiment as described above, since the first wall 10 has
a small half apex angle θ, the stiffness is increased and the high sound resonance frequency is
increased. Therefore, when the voice signal current is supplied to the respective Heuss coils 13
and 14 to drive the main cone 1 and the sub cones 20 & ′ ′ ′ by the above-described drive
unit 21, the first and second wall portions of the main cone 1 The entire io and ii operate to emit
voice, and in the middle to high range, the first wall 10 having a high treble resonance frequency
operates to radiate all sound. Further, the sound in the high range is emitted from the subcone
20. FIG. 4 shows the results of actual measurement of the reproduction frequency characteristics
of the embodiment (having a diameter of 20 crnQ) VC having the above-mentioned configuration.
That is, in the embodiment Vc as described above, the sound of the bass region is radiated from
the whole of the first and second wall portions 11 of the main cone 1, and the first to highresonance or high-pitched resonance frequency is high. Since the sound emitted from the wall
and the sound in the higher range is emitted from the subcone, the nine-frequency characteristic
can be expanded or reproduced as shown in FIG. 4 so that the sound in the high range can be
reproduced. In the example, since the sub cones 20 are arranged non-concentrically to the main
cone 1, the sounds radiated from the respective cones 1 and 20 do not mutually interfere with
each other, and the good sound quality Yayoi EndPage : You can get 2 sounds.
Furthermore, in each of the above-mentioned embodiments, since the cone is driven by two
Heuss coils, the allowable input is, for example, for a single voice coil with a 0.15 ridge diameter,
a solid line with a diameter of 061 inch. The wire diameter of the voice coil can be reduced, and
the mass mvi of the voice coil can be reduced, and the gap of the magnetic circuit can be
reduced. Therefore, by reducing the mass mvi of the voice coil, the high frequency co-image
frequency of the cone can be increased, and by reducing the gap of the magnetic circuit, the
effective utilization and heat dissipation of the magnetic flux are improved. Can be a dog. As
described above, according to the present invention (in the case of the present invention, since
the sub cones disposed non-concentricly with respect to the main cone are provided, the sound
radiated from each of the above cones does not interfere with each other, and a high sound range
is provided. You will be able to play up to the sound of. Further, since the drive unit is driven at
two points, it is possible to improve the reproduction frequency characteristics and the allowable
input by driving each cone with two voice coils. Therefore, it is possible to expand the
reproduction frequency characteristics without deteriorating the sound quality of the
reproduction sound, and to achieve the desired purpose VC sufficiently.
4. Brief Description of the Drawings FIG. 1 is a plan view showing an embodiment of the present
invention. FIG. 2 is a cross-sectional view taken along the line X-X of the embodiment shown in
FIG. It is the same <Y-Yi @ view as FIG. FIG. 4 is a hunting gland diagram showing the result of
actualizing the reproduction frequency characteristic of the embodiment described above. 1 · @
peak · · · Main cone 7.8 · · · · · · · · io around the major axis direction on the approximate oval, i 1 · ·
· · 2 wall portion · · · · ■ Zab corn θ O · · · half apex Corner patent applicant Sony Corporation
Attorney Attorney Koike first figure 1 '1 / / L, y 211th 3-EndPage: 3
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