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JP2002078086

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2002078086
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
transducers and magnets housed therein, and in particular to low frequency and high frequency
transducers, such as compound loudspeakers, having combined magnet systems.
[0002]
BACKGROUND OF THE INVENTION Conventional speakers use a standard iron magnet in
conjunction with a voice coil to control a speaker cone, dome or other diaphragm. However, such
magnets are relatively large and heavy, causing a stray magnetic field that requires a bulky shield
to seal or increase the distance between them, and unnecessarily increasing both the size and
weight of the speaker. I will.
[0003]
In high fidelity speakers, it is desirable to place the high frequency diaphragm as close as
possible to the medium to low frequency diaphragm so that the sound is believed to come from a
single source. It is known that smaller assemblies are required to achieve this result. It has been
found that such smaller designs can be achieved by using high energy magnets such as magnets
formed from neodymium-iron-boron instead of standard iron magnets.
12-05-2019
1
[0004]
However, even with the use of neodymium-iron-boron magnets, the assembly of the drive unit is
still bulky and complex, requiring many parts and many steps to assemble. For example, U.S. Pat.
No. 5,548,657 to Fincham describes a first transducer for generating sounds in the low
frequency range and a second transducer for generating sounds in the high frequency range.
Discloses a composite speaker drive unit. However, the large magnet structure and its complex
assembly increase the overall depth and weight of the drive unit in an undesirable manner.
[0005]
Thus, it is simpler in both design and use, more economical, smaller and more efficient in its
construction and use, and quick assembly, while eliminating the need for larger magnets and
drive units. There remains a longstanding and continuing need for advances in the art of
composite speakers that are possible.
[0006]
SUMMARY OF THE INVENTION Accordingly, the general object of the present invention is to
overcome the disadvantages of the prior art.
[0007]
In particular, it is an object of the invention to provide a composite loudspeaker with fewer parts.
[0008]
Another object of the present invention is to provide a composite loudspeaker in which the size
of the transducer is reduced.
[0009]
Another object of the present invention is to provide a composite speaker in which the weight of
the assembly is reduced.
[0010]
Another object of the invention is to provide a composite speaker in which the magnets and their
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housings are relatively compact.
[0011]
Yet another object of the invention is to provide a composite speaker in which the weight of the
transducer is reduced.
[0012]
Yet another object of the present invention is to provide a composite speaker that is easily and
quickly assembled and disassembled.
[0013]
Yet another object of the present invention is to provide a composite speaker in which the
magnet structure is magnetizable in unison after its assembly.
[0014]
Another object of the present invention is to provide a composite speaker in which a high
frequency voice coil and a low frequency voice coil are in close proximity to each other.
[0015]
In accordance with the principles of the present invention, a unique high frequency speaker is
presented that overcomes the shortcomings of the prior art.
The speaker has a circular first seat with a circumferential annular wall, from which the wall
extends in the vertical direction.
The first pedestal is a magnet pot, preferably made of steel.
Preferably, the disk-shaped first magnet is received in the wall of the first pedestal and forms a
uniform channel between the first magnet and the wall.
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3
The first magnet is preferably at the same height as the wall and forms the same plane.
At least one aperture extends through the first pedestal at a position between the first magnet
and the wall, and a channel is defined therein.
The first magnet is attached to the floor of the first pedestal by any bonding means known in the
art, such as but not limited to structural adhesives.
[0016]
A second pedestal, which is preferably essentially circular, is positioned on the first magnet and
the wall of the first pedestal without closing the uniform channel.
The second pedestal has an annular protrusion extending in the opposite direction from the first
pedestal and encloses therein the disk-shaped second magnet.
An annular opening is defined between the protrusion and the second magnet.
[0017]
The second pedestal has an annular flange extending beyond the annular protrusion and
overlying the annular wall of the first pedestal.
The flange is provided with means for coupling the second pedestal to the annular wall of the
first pedestal.
At least one void is defined through the flange and the void is in substantially axial alignment
with the aperture of the first pedestal to allow the electrical conductor to pass therethrough.
[0018]
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The second magnet has on it a disc-like plate which is preferably of the same radius as the
magnet. The plate has a dome shaped diaphragm thereon that is movably suspended. The dome
shaped diaphragm has a voice coil thereon extending into the annular air gap. When current is
applied to the voice coil, the voice coil is forced to move within the air gap by the magnetic flux
produced by the magnet. Thus, the dome moves back and forth, thereby producing an audio
output.
[0019]
An annular chassis is positioned on the flange of the second pedestal, and the chassis keeps the
generally conical diaphragm movable thereon. A second voice coil is maintained on the conical
diaphragm and extends into and through the opening defined between the annular wall and the
first discoid magnet. When current is applied to the second voice coil, the voice coil is forced to
move within the annular opening by the magnetic flux provided by the magnet. Thus, the conical
diaphragm moves back and forth, thereby producing an audio output.
[0020]
As a result, the disk-shaped first and second magnets reduce the number of parts needed to
assemble the composite loudspeaker. Furthermore, the compact nature of the magnet allows the
first and second voice coils to be close in distance to allow for source matching, thereby
increasing clarity. Furthermore, this arrangement of the two magnets allows the option of
simultaneously magnetizing the two magnets after they are assembled.
[0021]
These stated objects and advantages of the present invention are by way of example only and
should not be construed as limitations on the present invention. These and other objects,
features, aspects and advantages of the present invention herein will become more apparent
from the following detailed description of embodiments of the present invention in conjunction
with the accompanying drawings and claims that follow. Will.
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[0022]
It is to be understood that the drawings are used for illustrative purposes only and should not be
used as a definition of the limitations of the present invention.
[0023]
In the drawings, like reference numerals indicate like elements throughout the several views.
[0024]
DETAILED DESCRIPTION Referring to FIGS. 1-6, several views of a preferred embodiment of the
transducer 10 in the form of a composite speaker are shown.
Transducer 10 has a first pedestal 12 having a top surface 14 and a bottom surface 16.
The wall 18 extends vertically from the top surface 14 at the outer portion of the first pedestal
12. The first pedestal 12 is preferably circular and the wall 18 is annular. The first pedestal 12
may be a magnet pot, preferably made of steel, but is not limited thereto.
[0025]
A first magnet 24, preferably disk-shaped, is received on its upper surface 14 within the first
pedestal 12 so that a substantially uniform channel 26 is formed between the first magnet 24
and the wall 18. Is maintained. The first magnet 24 may be attached to the top surface 14 of the
pedestal 12 by any attachment means known in the art, such as, but not limited to, structural
adhesives. Furthermore, the first magnet 24 is adapted to be substantially the same height as the
upper end 22 of the wall 18. At least one aperture 28 extends out of the top surface 14 through
the bottom surface 16 of the first pedestal 12. An aperture 28 is preferably located between the
first magnet 24 and the wall 18 and generally below the channel 26.
[0026]
A second pedestal 30 having an upper side 32 and a bottom side 34 is positioned above the first
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magnet 24 so that the bottom side 34 contacts the magnet 24 at the end opposite the first
pedestal 12. The second pedestal 30 may be attached to the magnet 24 by any attachment
means known in the art, such as but not limited to structural adhesives. The second pedestal 30
may be a magnet pot, preferably made of steel, but is not limited thereto and may be made of any
suitable material known in the art. The second pedestal 30 is preferably essentially circular and
has protrusions 36 extending vertically from the upper side 32 and forming an annular wall. At
the upper end 38 of the projection 36, the annular lip 40 extends vertically inward from the
projection 36 and is substantially parallel to the upper side 32.
[0027]
An annular flange 42 extends outwardly from the second pedestal 30 in the same plane as the
bottom side 34 and is on the upper end 22 of the wall 18. The flange 42 defines at least one
cavity 44 therein, preferably four equidistantly spaced cavities 44 above the flange 22 such that
there is a cavity 44 above the upper end 22. The cavity 44 can accommodate coupling means,
such as, but not limited to, a threaded element, such that the second pedestal 30 can be
removably attached to the first pedestal 12. The at least one opening 46 is preferably annular
and defined by the flange 42, the opening 46 being positioned more inward with respect to the
cavity 44. At least one void 48 is also defined through the flange 42 and the void 48 is
positioned further inward than the opening 46. Further, the void 48 is in substantially axial
alignment with the aperture 28. In the preferred embodiment, the two voids 48 are provided
opposite one another on a center line equally dividing the second pedestal 30.
[0028]
A second magnet 50 having a substantially disc shape is spaced equidistantly from the projection
36 so that an annular groove 52 is created therebetween. It is placed at the top. The plate 54 is
positioned above the second magnet 50 such that the plate 54 is in a plane coincident with the
lip 40 of the projection 36. The second magnet 50 may be attached to the second pedestal 30
and the plate 54 by any attachment means known in the art, such as but not limited to structural
adhesives. An annular gap 56 is defined between the outer edge of the plate 54 and the lip 40 of
the second pedestal 30. In the preferred embodiment, the annular air gap 56 may be injected
with a metal fluid, preferably a ferrofluid, or some other material that has excellent heat transfer
characteristics but does not interfere with the movement of the components therein .
[0029]
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A spacer 58 having an annular shape is positioned on the outer surface of the projection 36 of
the second pedestal 30. The spacer 58 has a vertical portion 60 connecting to the outer surface
of the projection 36 and a horizontal portion 62 connecting to the upper region of the lip 40. The
vertical portion 60 is preferably in axial alignment with the void 48 and the aperture 28 and is
adapted to receive the conductive element 64 through the void 48 and the aperture 28.
Horizontal portion 62 is also adapted to receive elements 64 passing therethrough. The element
64 is an electrical conductor that is electrically isolated from the first pedestal 12, the second
pedestal 30 and the channel 26 as it passes therethrough.
[0030]
The dome shaped high frequency diaphragm 66 has an annular support 68 in the form of an
annular corrugated form on its outer periphery, the support 68 being connected to the spacer 58
in a movable manner. A cylindrical coil former holding the high frequency voice coil 70 is fixed
to the diaphragm 66 so that the voice coil extends through the air gap 56. The diaphragm 66
may be made of various rigid materials, and in the preferred embodiment, the diaphragm 66 is
made of a metal such as but not limited to titanium or aluminum. The diaphragm 66 may also be
made of multiple alloys containing metals such as, but not limited to, aluminum and boron.
Furthermore, the diaphragm 66 may also be made of a soft material such as, but not limited to, a
sealed material, a flexible material such as plastic, or any other suitable material known in the
art. In operation, when current is applied to the conductive element 64 and then the voice coil
70, the voice coil 70 is brought about by the first magnet 24 and the second magnet 50, the lip
40, the second pedestal 30 and the plate 54. The magnetic flux is forced to move in the air gap
56. The dome shaped diaphragm 66 is then moved axially back and forth. As the dome moves
forward, it compresses the air in front of it, and as the dome moves back it thins the air in front
of it, thus providing the desired audio output with multiple compressions and dilutions.
[0031]
With particular reference to FIGS. 3, 4, 5 and 6, chassis 72 has a forward annular protrusion 74
and a rearward annular member 76 interconnected by a plurality of ribs 78. As shown in FIG.
The rear annular member 76 has a centrally projecting annular rim 80. The annular rim 80 is
connected to the flange 42 of the second pedestal 30 in a fixed but removable manner and is
fitted thereon in a manner such that the opening 46 is not closed.
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[0032]
The second diaphragm 82 includes a medium and low frequency diaphragm and is generally in
the form of a truncated cone. The second diaphragm 82 is connected at an outer edge 84 to the
projection 74 via a flexible lip 86. The second diaphragm 82 is connected at its inner edge 88 to
a tubular coil former 90 which is adapted to extend into the opening 46 defined by the flange 42.
The coil former 90 holds the low to medium frequency voice coil thereon such that the coil
extends through the opening 46.
[0033]
An essentially annular and flexible suspension member 92 is fixed between the annular member
76 of the chassis 72 and the coil former 90 and the coil former 90 and the voice coil held
thereon are open 46 Are maintained concentrically with it and ensure that it is kept from
physical contact with surrounding elements during the sound producing movement of the second
diaphragm 82. If desired, the length of the coil former 90 may be extended or shortened to
control the distance of the second diaphragm 82 from the dome shaped diaphragm 66. A flexible
lead-out conductor 94 extending from the voice coil to the external connector 96 provides a
connection to the low and medium frequency voice coil.
[0034]
In the case of a high frequency drive unit positioned at or adjacent to the neck of the second
diaphragm 82 of the low to medium frequency drive unit, as described above, the apparent
source or acoustic center of the high frequency drive unit is It will be appreciated that it
substantially coincides with the apparent source or acoustic center of the frequency drive unit.
[0035]
The radiation pattern or directivity of the low frequency drive unit is determined, inter alia, by
the shape of the low frequency second diaphragm 82 and the annular waveguide 98 around the
dome shaped diaphragm 66.
In the case of a high frequency drive unit positioned adjacent to the neck of the low to high
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frequency second diaphragm 82, the shape of the low to high frequency cover imposes its
directivity on the radiation pattern or directivity of the high frequency unit. As a result, at
frequencies where both drive units contribute significant sound output, both drive units have
substantially the same pattern of radiation or directivity. As a result, the relative sound
contribution from the two drive units as perceived by the listener is substantially insensitive to
the listener being positioned off-axis.
[0036]
The low and medium frequency diaphragms are shown as coverings in the form of a cone having
an increasing flare angle from the inner edge 88 to the outer edge 84. However, it will be
appreciated that the cover may be in the form of a cone having a uniform flare angle. Also, the
middle and low frequency covers may be circular, oval, square, rectangular or other parts, as
desired.
[0037]
The high frequency diaphragm 66 is shown in the drawings as being dome shaped. Such
diaphragms are preferred. Because the acoustic center can be easily located closely in line with
the center of the low and high frequency diaphragms, and in the frequency range where both
units contribute significant sound output, their small size to wavelength However, it is by itself
giving it an essentially omnidirectional sound emission, so that the effective directivity is defined
by the low and medium frequency diaphragms. It will be appreciated that the high frequency
diaphragm 66 may alternatively be of any other form that provides these features.
[0038]
It will also be appreciated that the arrangement of the first magnet 24 and the second magnet 50
of the present invention reduces the number of parts needed to assemble the two drive units.
Furthermore, this arrangement of the two magnets allows its magnetization as an assembly, but
in the prior art each magnet had to be individually magnetized and then assembled. Furthermore,
the magnets may have the same polarity, which allows for magnetization as an assembly, or the
magnets may have opposite polarity and be individually magnetized and then assembled.
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[0039]
Although the above description contains many specificities, these should not be construed as
limiting the scope of the present invention, but rather as an illustration of one preferred
embodiment thereof. Many other variations are possible without departing from the essential
spirit of the invention. Accordingly, the scope of the invention should be determined not by the
embodiments illustrated, but by the appended claims and their legal equivalents.
[0040]
Brief description of the drawings
[0041]
FIG. 1 is a top view of a dome shaped high frequency diaphragm connected to the driver portion
of the present invention.
[0042]
Figure 2 is a cross-sectional view of the dome shaped high frequency diaphragm and driver
portion taken along line 2-2 of Figure 1;
[0043]
FIG. 3 is a cross-sectional view of the speaker, also illustrating the chassis and low frequency
diaphragm.
[0044]
FIG. 4 is a top view of the composite speaker.
[0045]
FIG. 5 is a cross-sectional view of an alternative preferred embodiment of the speaker, also
illustrating the chassis and low frequency diaphragm.
[0046]
FIG. 6 is a cross-sectional view of the driver portion and the radio frequency dome of an
alternative preferred embodiment.
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[0047]
Explanation of sign
[0048]
12, 30 pedestals, 24, 50 magnets, 66, 82 diaphragms, 70 voice coils.
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