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JPS5553996

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DESCRIPTION JPS5553996
Description 1, title of the invention
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3. Detailed Description of the Invention The present invention provides a speaker free of
distortion. The loudspeaker of the centralized drive system by voice coil is a cone type speaker by
its diaphragm shape! There is a flat type speaker I dome type speaker. 2 pages These
loudspeakers and scissors, the diaphragm which is a movable part. Edges and dampers are used
to support the frame and magnetic circuit that are non-moving parts. In the case of a cone type
speaker or a flat panel type speaker, the outer peripheral portion of the diaphragm is supported
by an edge member, and the coil bobbin fixed to the diaphragm is supported by a damper to
prevent lateral vibration in the direction perpendicular to the vibration direction of the
diaphragm. doing. The damper still plays a role in generating the elastic restoring force
necessary for the vibration of the diaphragm, and the edge prevents the sound pressure on the
back of the diaphragm from being introduced to the front. The function of rqM 'is to eliminate
the disturbance of the sound pressure frequency characteristic due to the phase difference
between the sound pressure and the back sound pressure. In the case of a dome-shaped speaker,
an elastic restoring force is normally exerted by the edge without using a damper. As described
above, since the conventional speaker has a solid support system such as an edge or a damper,
the size of the elastic displacement tends to be limited, and the linear relationship between the
elastic displacement and the driving force collapses at the time of large amplitude, There is a
drawback that low-pass distortion occurs due to non-direct female nature of the support system.
This first drawback is particularly pronounced for EndPage: 13-----small diameter woofers, for
example with a 90 phi aperture woofer to obtain 100 dB of sound pressure (distance 1 m), 6mz
501 'iz requires about 248 swings, and when the amplitude is 6th edition,' 4A wave distortion
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exceeds 10 lines. Even in the case of a large woofer having a diameter of 3009 or more, even if a
molded product of a polymer sheet or impregnated fabric is used as a support system, the
problem of distortion due to non-linearity at large amplitude exceeding several periods can not
be fundamentally solved. Also, in the above conventional speaker, in order to extend the low
frequency reproduction band, when designing the lowest resonance frequency to be low, it is
necessary to reduce the elastic constants of the dampers and the edges, but it is necessary to use
thin and soft materials. In these support systems, the ability to hold the center of the diaphragm
is weak, so that the roll vibration becomes large, and as a result, there is a defect that the sound
pressure frequency characteristic is disturbed or distorted. In addition, if the magnetic gap length
of the magnetic circuit is increased in order to prevent contact of the voice coil with the magnetic
pole due to the rolling vibration, there is a drawback that the cost is increased. Moreover, in the
conventional speaker, there is a drawback that unevenness of several dB or more is generated in
the high-frequency frequency characteristic due to the edge resonance.
For example, in the case of a cone type speaker, unevenness due to edge resonance occurs in the
middle range of the noble band, and in the dome type speaker, there is a drawback that the high
frequency reproduction limit is lowered due to the edge resonance. As described above, in the
conventional speaker (C, the above-mentioned various drawbacks occur when supporting the
vibration system with a solid support system. The present invention eliminates the abovementioned conventional drawbacks, and an embodiment of the present invention will be
described below. In FIG. 1, reference numeral 1 denotes a container whose upper surface is open,
and a partition plate 2 is integrally formed in the container 1. 3 and 4 are holes formed in the
partition plate 2 respectively. A yoke 5 is fixed to the partition plate 2. A center pole 7 having a
hole 6 is integrally formed at a central portion of the yoke 5. 8: an annular magnet fixed on the
upper surface of the yoke 6, 9 (an annular yoke fixed on the upper surface of the magnet 8; the
inner circumferential surface of the yoke 9 and the sensor 5; An annular magnetic gap is formed
between the outer peripheral surfaces of the tar pole 7. Reference numeral 10 denotes an
annular yoke fixed to the opening of the container 1, and a protrusion 11 is formed on the inner
peripheral portion of the yoke 1o. An annular magnet 12 fixed to the upper surface of the yoke
1o and a yoke 13id are fixed to the upper surface of the magnet 12 and the inner peripheral
portion of the yoke 13 is a protrusion facing the protrusion 11 of the yoke 1o. Article 14 is
formed. A magnetic fluid 15 is filled in the magnetic gap between the ridges 11j14 of the yoke
1ot13. The magnetic fluid 16v'i is a dispersion of colloidal magnetic ultrafine particles in a fluid,
and the magnetic fluid 15 is held between the ridges 11.degree. 14 of the yoke 10713 as shown
in FIG. A disk-like diaphragm 16 is made of a foamed resin, a foamed metal, an aluminum
honeycomb material or the like, and this diaphragm 16 is inserted into the center hole of the
annular yoke 1o и 13. FIG. 2 shows a state in which the diaphragm 16 is inserted. In this state,
the magnetic fluid 16 tends to gather in the vicinity of the strong magnetic cap on page 6 of the
magnetic field, and the pressure is released to the outer peripheral surface of the work plate 16.
The storage diaphragm 16 is supported as shown. When the 'kz' Ff) J ? 16 is decentered, a force
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acts to push it back around the diaphragm 16, and it is always held at the center. Reference
numeral 17 denotes a coil bobbin fixed to the lower surface of the work plate 16, and 18 an nvoice coil wound around the coil bobbin 17. The voice coil closing 8 is a magnetic gap between
the yoke 9 and the center pole 7. It is arranged in the department.
Next, FIG. 2a, b will be described in more detail. As shown in FIG. 2a, when the diaphragm 16 is
not inserted, the magnetic fluid 16 has a magnetic flux density corresponding to the distribution
of the magnetic flux density of the magnetic gap between the ridges 11 # 14 of the yokes 10 and
13. Gathered in a large space. The saturation magnetic flux density of the magnetic fluid 16 is 1Q
o to 4oo (X 5 auss), which is one digit or more smaller than the magnetic flux density of the
magnetic gap before magnetic fluid filling, and the change of the magnetic flux density
distribution after filling is small. Therefore, even in the space occupied by the EndPage: page 27
magnetic fluid 16, there is an internal stress that tends to gather at a point where the magnetic
field gradient is large and the magnetic flux density is large. As shown in FIG. 2, when the
vibration plate 16 is inserted, the magnetic fluid 16 is pushed away from the magnetic flux
density comparison fishing part by the vibration plate 16 to restore the original stable state
(internal stress (internal stress) ) Generates a force F which pushes the diaphragm 16 away. The
cusps act on the entire annular outer peripheral surface of the diaphragm 16 and hold the
diaphragm 16 at the center. When the vibration & 16 is decentered, the magnetic field gradient
on the side to which the vibration a1 1e approaches is greatly affected by a large body force
proportional to that, but when the diaphragm 16 is separated, the body force becomes smaller.
As a result, a force to return the diaphragm 16 to the original state is generated. ???????
???????? The magnetic circuit composed of the magnet 12 and the magnetic fluid 15
maintain the center of the diaphragm 16, and also functions to seal the air behind the diaphragm
16 if the magnetic fluid 16 is. That is, the back of the diaphragm is completely sealed by the
container 1, the diaphragm 16, and the magnetic circuit / magnetic fluid 16. This sealed air
works as an air spring for the image pickup movement of the diaphragm 16 and generates%
reciprocation light power of the diaphragm 16. The magnetic fluid 16 only exposes an annular
cross-sectional area of one word or less in thickness bounded by the a field to the back surface,
and the magnetic fluid 15 does not fly out due to the change of the air pressure on the back
surface. When the diaphragm 16 is finally fitted at the time of speaker assembly, the internal
pressure of the sealed back cavity is increased, so a needle such as a syringe is externally
inserted into the magnetic fluid 15 to extract a necessary amount of air in the back cavity. The
position of the diaphragm 16 can be set. In addition, the displacement of the diaphragm 16 due
to long-term use can be easily desired by the same method. In particular, in the present
invention, since the diaphragm 16 can be held without using a solid support system such as a
damper or an edge, a vibration with a large amplitude of several or more can be made without
distortion.
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According to the present invention, an amplitude of 97,-.. about 12 feet can be practically
realized with a small diameter woofer of 90?, and a maximum output sound pressure of 1 o 6
dE (distance 1 m) or more can be obtained at 100 Hz. The distortion can also be made less than 1
inch. In the conventional loudspeaker, there is a drawback that the edge resonance is apt to
occur when the width of the edge is increased to guarantee a large amplitude, but according to
the present invention, such a problem does not occur. In addition, since the lowest resonance
frequency of the electrodynamic speaker of the present invention is determined only by the
effective mass of the diaphragm 16, the volume of the rear cavity, and the wedge, there is an
advantage that the design can be simplified. For example, if the diameter of 200? and the
effective mass is 50y?1 and the back cavity volume is 5o?, the lowest resonance frequency can
be designed to be about 50 Hz. In the present invention, the Q value of resonance can be freely
changed simply by changing the viscosity of the magnetic fluid 15. Furthermore, according to the
present invention, it is possible to improve the efficiency of about 1 to 3 dE without using a
vibrating part that does not contribute to acoustic radiation such as a damper. Also, in the
conventional speaker, the heat resistance of the part requiring deformation motion such as edge,
dovetail, punper, etc. was a problem, but in the present invention, the edge damper is not
necessary, so 100 ░ C. It can be used in the above environment. FIG. 3 + a-%-6 respectively show
a diaphragm support structure of another embodiment of the present invention. In FIG. 3a, two
annular magnetic caps are formed by interposing annular magnets 22 and 23 between the
annular yokes 19j 20I 21 and the magnetic gaps 24 and 25 are filled in the respective magnetic
gaps to form diaphragms. The outer peripheral surface of 16 is supported at two places.
According to the present English example, even a heavy diaphragm can be stably supported. The
rolling reduction effect is improved. In FIG. 3 bH, an annular maddy and a mat 28 are interposed
between the yokes 26727 to form a magnetic circuit, and the cylindrical portion 30 of the
diaphragm 16 is made of the magnetic fluid 29 filled in the magnetic gap of the magnetic circuit.
According to the present example, it is possible to reduce the adhesion of external dust or the
like to the magnetic fluid 29 according to the present embodiment. EndPage: 311.9, FIG. 3C
shows a magnetic circuit comprising a yoke 32 having an annular ridge 31 formed on the outer
periphery, an annular magnet 33 and an annular yoke 34, and the ridge 31 of the yoke 32 The
cylindrical portion 30 of the diaphragm 16 is inserted into the magnetic gap between the inner
peripheral surface of the yoke 34 and the outer peripheral surface of the yoke 34, and the
diaphragm is made of magnetic fluid 36 filled between the cylindrical portion 3 o and the yoke
34. It supports 16
In FIG. 3d, a yoke 36I3? and a magnet 38 constitute a magnetic circuit, and the cylindrical
portion 30 of the diaphragm 16 is inserted into the magnetic gap between the yokes 36 and 37.
The cylindrical portion 30 and the yoke are illustrated. The vibration plate 16 is supported by
magnetic fluid 39j 40 which is filled between the cylindrical portion 3o and the yoke 37 in
question. In FIG. 3e, an annular magnet 43 is interposed between the yokes 41742 to form a
magnetic circuit, and a film rich in surface lubricity such as Teflon, FEP, polyethylene or the like
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is formed on the inner peripheral surface of the annular magnetic circuit. An inner peripheral
surface of the film 44 is filled with the magnetic fluid 11 and the diaphragm 16 is supported by
the magnetic fluid 45. In the present embodiment, even if the diaphragm 16 swings very large,
the diaphragm 16 does not directly contact the yokes 41 and 42, and temporary loss << <<, and
moisture remaining in the magnetic fluid 4 etc. Also, it has an advantage that the yokes 41 and
42 are not oxidized by a trace amount of acidic substance. FIG. 4 shows a drone cone type
speaker device. This speaker apparatus is provided with an electrodynamic speaker and a passive
diaphragm (passive / radiator) shown in FIG. 1, and the same reference numerals are given to the
same parts as FIG. In FIG. 4, reference numeral 46 denotes a support plate for supporting the
magnetic circuit in a container (speaker box) 47. A hole 48 is formed in the support plate 46. An
annular magnet 49 is fixed in the hole of the front plate 50 of the container 47. Annular yokes
51 and 52 are fixed on both sides of the annular magnet 49, and the inner peripheral portion of
the yokes 51 and 52 is fixed. The annular magnetic gap to be formed is filled with the magnetic
fluid 63, and the passive diaphragm 54 is supported 13 by the magnetic fluid 53. 56 is a sound
absorbing material stored in the container 47, and 56 is an air pressure adjusting device attached
to the container 47. In FIG. 4, the passive diaphragm 54 inverts the phase of the sound radiated
to the back of the electrodynamic speaker, and the loudspeaker diaphragm 16 and the passive
diaphragm 54 are driven in phase at a low frequency to achieve low frequency. Increase the
sound pressure of the In this case, it is required to reduce the stiffness of the passive diaphragm
as much as possible so that fO is 20 hz or less, but in the embodiment of FIG. 4, the stiffness by
the support system of the passive diaphragm 64 is 0. In addition, the reproduction band of the
bass is expanded compared with the one using the conventional passive diaphragm. Further,
according to this embodiment, distortion due to non-linearity of the support system of the
passive diaphragm at the time of large amplitude does not occur.
The air pressure adjusting device 56 is used for removing the air in the container 47 when the
diaphragm is fitted at the time of assembly 5, particularly when the atmospheric pressure in the
container 47 is adjusted to the same pressure as the outside air pressure. For example, various
devices can be used, such as a structure in which a piston is fitted into a cylinder having an
intake valve and an exhaust valve which are crimped and sealed by a spring. Instead of the air
pressure adjusting device 56, it is also possible to fit a rubber-like substance into the hole formed
in the container and press the needle of the syringe into the rubber-like substance to adjust the
air pressure. The present invention does not use a solid support system such as the structure
described above, an edge member, a damper or the like, and enables vibration with a large
amplitude of several cabinets or more without generation of distortion.
4. Brief description of the drawings. FIG. 1 is a cross-sectional view of a speaker according to an
embodiment of the present invention, FIG. 2 zpb is an enlarged cross-sectional view of the main
part showing a diaphragm supporting principle of the speaker of the present invention, FIG. 8A
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and 8B are sectional views of the diaphragm support of the other embodiment of the present
invention, and FIG. 4 is a sectional view of the other embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 иииии Container и 2 иии Partition plate 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
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
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 9 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? ? ? ? ? ? ? ? ? ? ?
??????????????????????????????????
??????????????????????????????????
? ? ?Coil bobbin, 18 иииииии Voice coil, 19J 20 j 21 и и и и и Yoke, 22 = 23 и и и Magnet, 24125 иии и и и
Magnetic fluid, 26 j 27 и и и и и и и и и и и и --? Unevenness, 29 ░░░░░ Magnetic fluid, 30 иии Tubular
part, 31 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 3 34 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 magnetic
fluid, 36! 37 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 magnetic fluid, 41-42 и и и и и и и и и
и и и и и и и и и и и и и и .... Film, 45 ..... Magnetic fluid. 46 и и и "support plate, 47" ░ ░ ░ ░ container, 48
░ ░ ░ "hole, 49 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
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
front plate 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 Magnetic fluid, 54 и и и и и и passive diaphragm, 65 и и и и
sound absorbing material, 56 и и и и и и и и air pressure adjustment device. Name of agent Attorney
Nakao Toshio Nakano has 1 person Japanese Patent Application No. 55-53996 (5) Section 2 0)
method 51EndPage: ?
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