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JPS53106114

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DESCRIPTION JPS53106114
Description 1-Title of the invention
Cone speaker
3. Detailed Description of the Invention The present invention relates to a cone type speaker
having a good reproduction frequency characteristic and directivity characteristic. Heretofore, in
order to obtain reproduced sound with good sound quality from a cone type speaker, it has been
important to improve the reproduction frequency characteristic and directivity characteristic.
That is, the high-pitched sound characteristic of the cone-type speaker has a characteristic of
rapidly decreasing at a high-pitched resonance frequency fh or more determined mainly by the
mass my of the stiffness Sh1 voice coil at the cone top and the mass mc of the cone. In order to
achieve this, it is necessary to reduce the top (mv, mc и) of the voice coil or the cone or to
increase the stiffness sh of the top of the cone. The stiffness Sh at the top of the cone is
determined by the half apex angle ? of the cone and the thickness tc (m :) Young's modulus E
(dyne / crn :) of paper. Therefore, conventionally, in order to widen the reproduction frequency
band, the overall height of the cone is increased to reduce the half apex angle, fcj), 6 or voice coil
and cone paper are lightened, and the high sound resonance frequency is Although the rigidity
was increased in the vibration direction of the cone, it was accompanied by defects such as
deterioration of directional characteristics of EndPage: 1, deterioration of frequency
characteristics in middle to high range, and reduction of allowable input. . Furthermore, in the
case of a cone-type speaker, when listening to all the emitted sound, the distance from each part
of the cone is approximately equal on the front axis of the speaker, but in the oblique direction,
the distance from the valley of the cone Due to the difference, there arises a problem of
directivity characteristics that the listening state changes. That is, when the frequency of the
sound to be radiated increases and the half wavelength of the wavelength becomes equal to the
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run of the above distance, the sounds radiated from the valley of the above cone cancel each
other and weaken. As a result, directivity deteriorates. The higher the frequency of the directional
characteristic sound, the larger the effective vibration area of the cone, and the farther it is from
the front axis of the speaker, the more the directivity deteriorates significantly. Therefore,
according to the present invention, the diaphragm is formed by the wall portions with different
half apex angles, and a part of the small wall portion with a half apex angle is slipped, and the
wall with a large half apex angle with compliance increased by The configuration (3) of coupling
enables expansion and flattening of the reproduction frequency characteristics, and provides a
novel cone-shaped speaker in which the directivity characteristics are entirely improved.
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 YY sectional view in FIG. 1 are shown in FIG. 2 and FIG. In the figure, the cone 1 as
the diaphragm is fixed to the frame 3 at its outer peripheral portion via the wavy edge 2 and the
first and second bobbins 4. 5 are fixed to circumferentially extending portions 7 and 8 in the
major axis direction of the substantially oval window 6. The opening 9 formed by each of the coil
bobbins 4.5 and the window 6 is closed by a viscoelastic substance film. Further, the cone 1 is
referred to as a wall portion (referred to as a first wall portion) 100 on the major axis direction of
the substantially oval shaped window 6 (referred to as a wall portion M2 on the minor axis
direction). ) 110 half apex angle ? 2 (general cone half apex angle (4). Approximately equal to It
is formed to be smaller than). That is, since the first wall portion 10 has its half apex angle ?1
reduced, the stiffness 3h is increased and the p1 high sound resonance frequency fh is increased.
Furthermore, the above-mentioned cone 1 is cleaned in its radial direction at the boundary
between the first wall 10 and the second wall 11 and crosses the radial direction at the abovementioned first wall 10 Such a substantially U-shaped slit 20.21 is formed. The opening of the
substantially U-shaped slit 20 is located on the side of each circumferentially extending portion
7.8, and the first wall m10 and the second wall 11 are circumferentially elongated. It is
continuous on the parts 7 and 8 side. That is, a portion of the first wall portion 10 which is
continuous on each of the circumferentially extending portions 7.8 and divided into the second
wall 811 by the slit 20 ░ 21 is in a state where the compliance is large, The coil bobbins 4, 5
connected to the second wall 11 described above and disposed at the central portion of the cone
1 as described above are supported by the frame 3 via the damper 12, Each voice coil 13. ? 14
is wound. Furthermore, the first and second balls 18.19 fixed to the ends of the magnets 16.17
disposed concentrically to the yoke 15 are respectively inserted into the coil bobbins 4 and 5
described above. ing. The yoke 15 is fixed to the frame 3. Therefore, in the embodiment as
described above, the cone 1 has the first wall portion 10 larger in stiffness than the second wall
portion 11 and the above-mentioned first state in which the compliance becomes a dog. Since a
part of the wall 10 is coupled to the second wall 11, the first wall 10 and the second wall 10 can
be driven in the low frequency range when driven by the supply of audio current to each voice
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coil 13s14. As a whole, the wall 11 vibrates in a piston, and in the middle to high range, the first
wall 10 vibrates in a piston.
In particular, in the high tone range, only part of the first wall EndPage: 2 10, which is coupled to
the second wall 11 with high compliance, causes piston oscillation. The results of the
measurement of the reproduction frequency characteristics and the comparison with those of the
conventional example for the embodiment (having a diameter of 20 cm) as described above are
shown in FIG. In FIG. 4, the solid line shows the characteristics of the embodiment of the present
invention, and the broken line shows the characteristics of the conventional example. As shown
in FIG. 4, the reproduction frequency characteristics for the embodiment are expanded to high
frequencies and flatness is obtained. That is, in the embodiment as described above, the sound of
the bass region is obtained by j in the piston vibration of the first and second wall portions 10
and 11 overall, and the piston vibration of the first wall portion 10 Sound is obtained, and in
particular, high-pitched sound is obtained by piston oscillation of only a portion of the first wall
11, which is coupled to the second wall 11 in a state of greater compliance, Since the half apex
angle 0 ri of the wall portion 10 is small, the reproduction frequency in the high range becomes
high. If the physical constant of the cone is added so as to increase the Young's modulus of the
first wall portion 10, it is possible to further increase the reproduction frequency. If a viscous
substance is applied to the above-mentioned slit 20.21 and closed, the characteristics of the low
and high regions can be all good. Further, by forming the slits 20.21 in the cone 1, a sound of a
high frequency range is obtained in particular by the piston vibration of a part of the first wall
portion 10, and the high frequency range of the sound is an effective vibration area of the cone 1
Since the effective vibration mass of the small cone and the cone also becomes small, the
reproduction frequency can be increased. Furthermore, the mid-high range sound is emitted from
the first wall of the above-mentioned cone 1, and especially the high-range sound is emitted from
a part of the above-mentioned first wall 10, As the tone range becomes higher, the belt-like
sound source comes closer to the point sound source, so that the directivity can be improved. As
described above, according to the present invention, the top of the diaphragm is driven with a
wall with a large half apex angle and a wall with a small half apex angle, and the above small half
apex wall A middle-high-pitched sound is produced by forming a slit weir that divides a part of
the part in the radial and circumferential directions (7) and makes it continuous with the other
wall on the top side. The sound of the region is obtained by the piston vibration of a small halfapex wall, in particular the high-pitched sound is obtained by the piston vibration of a part of the
small half-apparent wall divided by the slit, so high frequencies It becomes possible to reproduce
even the sound of the sound, and the effective vibration area of the cone becomes smaller as the
tone range of the reproduction sound becomes higher, and it becomes closer to the operation as
a point sound source. By That.
Therefore, the intended purpose can be achieved sufficiently.
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4. Brief description of the drawings (8) FIG. 1 is a plan view of 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. FIG. 3 is a cross-sectional view taken along line Y-Y of the embodiment shown in FIG. FIG. 4
is a characteristic diagram showing the comparison between the reproduction frequency
characteristics of the embodiment of the present invention and that of the prior art. 1 иии
Diaphragm 10.11 иии-Wall portion 0, 21 иии Slit ?1. ? 2 и и и и и и Patent applicant Sony Corporation
Attorney Attorney Attorney Koike EndPage: 3 Figure 2 ? Rent endPage: ?
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