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JP2008252871

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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
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DESCRIPTION JP2008252871
The present invention provides a movable armature holder which is vibrated by an electric signal
supplied to a coil by providing an armature in a magnetic field of one or more magnets. A
compact movable armature receiver wherein a diaphragm element is disposed in the air gap of
the magnet assembly and a suspension element is provided to define the front chamber. The
suspension element has a stiffness of up to 500 N / m. The suspension element and the
diaphragm element may be made of the same foil sheet, and the suspension element may be
made of the bent or curved peripheral portion of the foil. [Selected figure] Figure 1
Movable armature holder
[0001]
The present invention relates to a movable armature holder that is vibrated by an electrical signal
supplied to a coil by providing an armature in the magnetic field of one or more magnets, the
magnetic field acting on the armature. In particular, the present invention relates to a compact
movable armature holder.
[0002]
In WO 2004/064483, WO 95/07014, US 7,054,460 and US 2005/0276433 different types of
containers are disclosed. WO 00/60902 shows a type of suspension scheme. WO 2004/064483
WO 95/07014 US 7,054,460 US 2005/0276433 WO00 / 60902
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1
Summary of the invention
[0003]
In a first aspect, the present invention is a container comprising a housing, in which a permanent
magnet assembly for generating a magnetic field in an air gap, a conductive drive coil comprising
a coil tunnel, an acoustic output, and A magnetically permeable armature assembly penetrating
the air gap and the coil tunnel in a first direction, a suspension element having a stiffness of up
to 500 N / m, extending into the air gap and cooperating with the suspension element And a
diaphragm element for generating a sound, connected to the container. The housing has first and
second chambers at least fractionated by the diaphragm element and the surface of the
suspension element. The acoustic output extends between the first chamber and the periphery of
the receptacle.
[0004]
Additional aspects of the present invention will become apparent to those skilled in the art upon
consideration of the detailed description of various embodiments, which are described with
reference to the drawings provided below and the brief description thereof. It will be described in
detail.
[0005]
The preferred embodiments of the present invention will be described with reference to the
following drawings.
[0006]
Fig. 2 shows a cross section of a container according to the invention.
[0007]
Fig. 2 shows a first partial assembly of the receptacle of Fig. 1;
[0008]
Figure 7 shows a second partial assembly of the receptacle of Figure 1;
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[0009]
7 illustrates an alternative method of providing reduced parasitic coupling between the housing
and the coil.
Detailed Description of the Drawings
[0010]
The present invention is capable of many different types of embodiments, which are shown in the
drawings and described herein with the details of the preferred embodiments of the present
invention, but the present disclosure is of the principle of the present invention. It should be
understood that it is to be construed as illustrative and that it is not intended to limit the broad
aspects of the present invention to the embodiments shown and / or described herein.
[0011]
The receptacle 10 of FIG. 1 has a movable armature or armature assembly 12.
The armature 12 is fixed at one end 14 thereof to the housing and the other end 16 is movable.
[0012]
The armature 12 is moved by the alternating magnetic flux (due to the alternating current
supplied thereto via the opening 40) generated by the coil 18 surrounding a portion of the
armature 12, the alternating magnetic flux comprising two magnets 20 and 22 enters the DC flux
generated by
Due to these magnetic fluxes, the armature 12 carrying the AC magnetic flux moves forward and
backward with respect to each of the magnets 20 and 22.
[0013]
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3
A diaphragm 24 attached to the armature 12 at the movable end 16 forms a magnetically
permeable diaphragm assembly with the armature 12.
The diaphragm assembly has a flexible or resilient side 26 attached to a sealing member 28 that
seals the space 29 above the diaphragm 24 from the space 31 under the diaphragm 24.
Spaces 29 and 31 are generally referred to as the front and back chambers of the container 10,
and will hereinafter be referred to herein as chambers for convenience.
[0014]
Due to the presence of the elastic side 26 forming the suspension element, the diaphragm 24 is
moved up and down by the armature 12 but the seal against the member 28 is maintained so
that the acoustic seal is maintained.
A DC vent may be present between the chambers 29 and 31, as is often found in this type of
container 10.
[0015]
Alternatively, the member 28 may be elastic to provide the necessary deformability to maintain
the mutual sealing of the two chambers 29, 31.
[0016]
Regions 32 and 34 are also provided in the housing.
The function of these parts will be described in detail below.
[0017]
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FIG. 2 shows a partial assembly of the container 10, in which upper housing parts 32 and 36 are
not attached to show the coil 18, the diaphragm 24 and the sealing member 28. FIG.
It can be seen that the sealing member 28 is configured to seal not only the longitudinal inner
surface portion (portion 37) of the receptacle 10 but also the end surface and the upper portion
36 when attached.
Of course, it is not necessary to seal both the side and the top. It can be seen from FIG. 1 that the
acoustic output 30 extends far enough away from the output end and provides an opening to the
chamber 29 defined on the upper side of the diaphragm 24.
[0018]
The sound pressure generated by the movable diaphragm 24 is output from the housing via the
sound output unit 30 provided thereto.
[0019]
For the container 10 to function optimally, for example, it is desirable that the direct current flux
generated by the permanent magnets 20, 22 be as strong as possible in the air gap between
them.
Therefore, it is desirable that a permeable flux return be provided between the permanent
magnets 20, 22 outside the air gap. Therefore, it is desirable that the housing part 32 to which
the permanent magnets 20, 22 are attached be magnetically permeable or conductive, and also
be a housing part that interconnects them, for example, a partial housing 34 (described later in
the container 10). Preferably, it is also magnetically permeable.
[0020]
Thus, the magnetic path from the air gap returns to the air gap through one of the permanent
magnets 20, 22, the upper housing portion 32, the partial housing 34, the lower housing portion
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5
32, the other of the permanent magnets 20, 22. This magnetic path is usually called a DC
magnetic path because it is generated by the permanent magnets 20 and 22.
[0021]
It can be seen that the DC magnetic path passes through the diaphragm 24 and the armature 12,
in which case the DC magnetic path interacts with the magnetic path generated by the coil 18
(usually referred to as an AC magnetic path). Also, the AC magnetic path is a closed magnetic
path that passes through the armature 12 and the diaphragm 24, and is a magnetically
permeable magnet that extends out of these elements and extends parallel to the armature 12
and the diaphragm 24 over the entire length of the container 10. The partial housing 34 is
entered.
[0022]
FIG. 3 shows a partial assembly of the container 10, in which it can be seen that the armature 12
may be made of the same material parts as the partial housing. As such, optimal magnetic
coupling / conduction is provided between these parts. This also reduces parasitic coupling, as
the permeability between these parts is optimized.
[0023]
In particular, when it is desired to provide a smaller container, parasitic losses occur due to the
generated magnetic path, which reduces the magnetic flux from a desired location, such as an air
gap. Such parasitic paths reduce the efficiency of the container 10.
[0024]
In this type of container 10, a parasitic flux path is found between the permanent magnets 20,
22 and passes through the housing to the coil 18. Such a magnetic path travels from the magnet
20 through the armature 12 / diaphragm 24 to the coil 18 without moving through the air gap
to the magnet 22 and has a magnetic flux returning to the magnet through the housing .
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[0025]
Another parasitic magnetic path may return to the coil 18 from within the coil 18 through the
armature 12 and the housing portion 36 (in the case of magnetic permeability, see below).
[0026]
In order to eliminate these magnetic paths, the upper housing part 36 is made of a non-magnetic
or non-conductive material.
In this way, the magnetic path from the permanent magnets 20, 22 to the coil 18 is only through
the magnetically permeable partial housing 34 which extends along the length of the receptacle
10. However, this parasitic magnetic path becomes extremely small when the dimensional
overlap between the partial housing 34 and the coil 18 is very small compared to the overlap
between the housing portion 36 and the coil 18. Furthermore, the alternating magnetic flux from
the coil 18 must then travel through the armature 12, the partial housing 34 and back to the
fixed end 14 of the armature.
[0027]
In order to further increase the active flux path, the housing part 32 preferably extends in the
direction of the end 14 up to the end of the permanent magnets 20, 22. Also, to reduce any
magnetic flux traveling from the armature 12 to the housing portion 32 outside the permanent
magnets 20, 22, the armature 12 may be permanent magnet 20, 22 in a direction perpendicular
to the longitudinal axis of the receptacle 10. It is desirable not to be wider.
[0028]
For the alternating current magnetic path, the magnetic flux from the armature 12 / diaphragm
24 enters the fixed end 14 of the armature 12 by moving from its end to the upper partial
housing 34 or the end element 37 of the receptacle 10 Return to the distal end 35 of the
receptacle to close the magnetic path. Magnetic flux may flow from the armature 12 through the
diaphragm 24 and the element 28 into the end element 37 or the upper partial housing 34. This
magnetic path is equally useful.
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[0029]
The AC magnetic path is generally in a plane parallel to the plane of the diaphragm 24, while the
DC magnetic path is generally in a plane perpendicular to the plane of the diaphragm 24.
[0030]
Thus, both magnetic paths are closed and optimized so that as many magnetic paths as possible
are provided at the desired position, parasitic magnetic paths are reduced and eliminated.
[0031]
In this preferred embodiment, the diaphragm 24 is made of a 2 μm thick PET sheet and may be
coated with a magnetically permeable material such as Ni.
Further, the armature 12 may be 0.1 mm thick and the portion 37 may be 0.32 mm thick, both
of which may be made of 50% Fe and 50% Ni, the housing portion and Portion 37 is similar.
The partial housing 34 and the sealing member 28 may be made of a yellow cylinder (63% Cu
and 37% Zn).
[0032]
The magnet may be a 0.25 mm thick AlNiCo magnet, and the coil 18 may have 550 turns of a 20
μm self-bonding wire.
[0033]
FIG. 4 shows an alternative method of reducing the parasitic path between the coil 18 and the
housing, wherein the housing parts 32, 36 are made of a single piece of material but the opening
38 is a housing It is provided in the part 36.
The openings 38 may be filled with a material having a low permeability or may remain open. In
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the case of the opening, the outer housing or the equivalent (rubber typically used to hold and
protect the container to prevent the sound output from the opening 38 from mixing with the
sound output from the sound output 30 It is desirable to provide a tube or sock).
[0034]
As an alternative to the opening 38, the housing portion 36 may be provided with multiple
openings. As mentioned above, these openings may or may not be filled with a low permeability
material. Also, instead of the opening, a housing portion 36 of reduced thickness material may be
used to reduce parasitic coupling between the coil 18 and that portion of the housing. If the
thickness is reduced to such an extent that the stability or strength of the housing is inadequate,
the housing is reinforced in place to fill any depressions in the housing material, using a low
permeability material It is also good.
[0035]
As an alternative to providing the openings or reducing the thickness of the part directly adjacent
to the coil 18 (e.g. above the coil 18), these may be uniformly assigned to the entire area of the
housing part 36 Or, it may be provided in the peripheral part. If provided in the peripheral part,
this area may have any desired permeability, as the central part is "magnetically isolated" from
these, for example from the housing part 32.
[0036]
Of course, the attached diaphragm 24 and armature 12 may be replaced by a single element,
which can generate the desired sound pressure and can seal the front chamber from the rear
chamber To have the desired width of the diaphragm. The seal may be provided in the same
manner as in FIG. 2 or may be provided on the sides of the diaphragm / armature and on the
inner surface of the housing 10 housing. In this case, the material of the armature / diaphragm is
usually so hard that the sealing material provides the elasticity necessary to realize its movement.
[0037]
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9
Two permanent magnets 20, 22 were provided on both sides of the diaphragm assembly for a
balanced arrangement. However, one of these permanent magnets 20, 22 may be replaced or
removed to generate a DC flux using only a single magnet (ie one of 20, 22) It is also good.
[0038]
It can be seen that while the container 10 is made extremely compact, it retains useful magnetic
paths and reduces or suppresses parasitic magnetic paths. The actual thickness of the container
10 is determined by the thickness of the housing portion 32 and the magnets 20, 22 and the size
of the air gap therebetween. Additionally, flat wide coils 18 may be used within this thin housing.
[0039]
The container 10 may have a thickness of 1 mm or less, and may have a width of 2.7 mm or less.
[0040]
In various embodiments, the magnet assembly described herein may comprise one or more
magnets, which may be arranged together in the container 10 or arranged at different locations
Although all of the magnets may be involved in the generation of the magnetic field introduced
into the air gap.
Similarly, in various embodiments, the coil 18 may comprise one or more coils that define a coil
tunnel. In other aspects, the armature 12 may comprise one or more portions, one or more of
which may be permeable. It is preferred that the part that penetrates both the air gap and the
coil tunnel be permeable so as to conduct the magnetic field from the coil tunnel to the air gap.
[0041]
In the present context, a magnetic path is created, which is the path of the magnetic flux of a
magnet (or a number of magnets) from one pole of the magnet to the other pole of the magnet.
Of course, more magnets may form a magnetic path, in which case the magnetic flux will extend
11-05-2019
10
from one pole of one magnet to the pole of the other magnet, etc. All magnetic paths are closed if
the flux lines are not openable. Magnetic flux passes through all materials as needed, but for
electrical signals, good conductors are preferred and should be used if available.
[0042]
Typically, the first and second chambers 29, 31 of the container 10 are acoustically sealed to one
another so that sound waves within a predetermined frequency interval do not move from one
chamber to the other . Of course, so-called direct current vents may be provided to provide
pressure relief as provided, for example, by moving in an elevator where the ambient pressure
changes.
[0043]
The suspension element (e.g. side 26) is elastic and preferably provides a seal between the end or
periphery of the diaphragm element and the inner surface of the housing, the diaphragm element
being acoustically generated As well as being able to provide a seal. It will be appreciated that the
diaphragm element 24 may be integrally made so as to be made or made monolithically from the
same material as the material of the armature assembly 12. Furthermore, additionally or
alternatively, the diaphragm element 24 may be integrally made so as to be made or
monolithically made of the same material as the suspension element.
[0044]
Alternatively or additionally, the suspension element (e.g. the side 26) may be made of a
membrane such as a flexible membrane (film), an elastomer, a rubber material, a foam, or the
like, or You may include them. Generally, the stiffness of the suspension element (force required
to move the diaphragm assembly when controlled or held only by the suspension element) is less
than 500 N / m, such as less than 400 N / m, preferably It is 300 N / m or less such as 200 N /
m or less and 100 N / m or less.
[0045]
The various elements disclosed herein may be shaped or provided, but they may be
interconnected in any suitable manner, including bonding, soldering, welding, heat welding,
11-05-2019
11
lasers Examples include welding, mechanical connection, or the like.
[0046]
In a first embodiment, the diaphragm element 24 and the suspension element 26 comprise a
film, such as a nonmagnetic conductive film, coated on a magnetically permeable material.
The diaphragm element is at least partially formed by an at least substantially planar central
portion of the membrane, and the suspension element is at least partially formed by a bent or
curved portion around one or more of the membrane. This flat part of the membrane is suitable
for the known diaphragm, the flexing or bending part of the membrane establishing the
movement of the diaphragm element (such as stretching or changing the flexing / curved shape)
the flexing / flexing It may extend in the direction configured. These define the stiffness of the
membrane material by flexing / bending as well as the compliance of the suspension provided by
the flexing / bending portion of the membrane.
[0047]
Generally, the compliance or stiffness of the armature assembly 12 is related to the resonant
frequency and other parameters of the receptacle 10, as the stiffness or elasticity of the armature
12 is part of the drive of the receptacle. The stiffness of the assembly is defined by both the
material and the dimensions of the assembly. Preferably, the stiffness of the assembly is at least
600 N / m but between 650 and 5000 N / m as measured at the force point of the armature
assembly (the point of the armature 12 on which the average force (size and direction of the
magnet assembly acts)). It is preferably between m. This position is often the center of the
magnet in a cross section along the plane of the diaphragm element 24.
[0048]
In a preferred embodiment, the armature assembly, alone or attached to the diaphragm element,
has a resonant frequency of 1 kHz to 10 kHz, such as 3 kHz to 5 kHz when free moving, for
example, when the magnet assembly is removed or demagnetized. . Low frequencies may be
suitable for woofers and high frequencies may be suitable for tweeters.
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12
[0049]
The resonant frequency is easily measurable, for example by making holes in the container 10
and designing so that the stiffness does not increase with the rear and front volumes. Also, the
magnet assembly may be removed so that the container 10 is not magnetized and stiffness
compensation due to magnetization from the magnet assembly is not required. It is also possible
to measure the resonance in the presence of a magnet, but it is preferred that the magnet be
demagnetized.
[0050]
It is then possible to measure the resonance of the armature / membrane assembly by shaking /
oscillating the container 10. The shaker / vibrator is driven with a frequency sweep of 100 Hz to
10 kHz. A laser vibrometer may then be used to measure the velocity of the armature assembly,
optionally with the diaphragm element. The container 10 moves according to the frequency of
the shaker / vibrator and has a sharp peak at the resonance frequency at which the armature
assembly's speed is the fastest at the resonance of the armature assembly.
[0051]
In a second embodiment, the armature assembly forms at least a part of the diaphragm element
and has a portion extending into the air gap and having a predetermined width, the suspension
element being of the portion of the armature assembly It is provided in the peripheral part.
[0052]
Preferably, the suspension element provides an acoustical seal between the peripheral portion of
the diaphragm element and the inner surface of the housing.
Preferably, the diaphragm element defines a first plane. Then, in a first embodiment, the
suspension element forms a seal at least substantially in a first plane between the peripheral
portion of the diaphragm element and the inner surface portion of the housing. This is desirable
in certain embodiments where a large first chamber is desired. In another embodiment, the
suspension element forms a seal extending at least substantially parallel to the first plane,
11-05-2019
13
between the peripheral portion of the diaphragm element and the inner surface portion of the
housing. Thus, cup-like, ring-like or donut-like suspension elements may be used to form all or
part of the diaphragm element.
[0053]
Preferably, the armature assembly may be pivotally or bendably fixed at an end located at one
end of the coil tunnel, in which case the air gap is located at the other end of the coil tunnel.
Thus, the portion of the armature assembly in the air gap is placed at a distance from the fixed
end so as to be movable, providing the required sound pressure to transfer movement to the
diaphragm element.
[0054]
In certain embodiments, the magnet assembly preferably includes a permanent magnet disposed
in the first chamber. By doing so, the container 10 becomes extremely compact. An additional
magnet may be arranged in the second chamber to provide a so-called balanced receptacle.
[0055]
In general, containers incorporating the present invention can be made extremely compact. Thus,
the housing may have a maximum dimension which is 1.9 mm or less (eg 1.5 mm or less),
preferably 1 mm or less (eg 0.8 mm or less), perpendicular to the plane defined by the
diaphragm element It is.
[0056]
Furthermore, the housing may have, in a plane perpendicular to the first direction, a width in the
plane defined by the diaphragm element and a thickness perpendicular thereto, the width being
1 to 5 of the thickness Between 1 and 10 times its thickness, such as between 2.4 and 4 times its
thickness.
[0057]
Preferably, a first closed flux path is present in the container 10, the first magnetic path
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comprising a first magnetically permeable housing portion, a permanent magnet assembly, an air
gap, and a magnetically permeable armature assembly.
[0058]
It is also preferred that there is a second closed flux path through the coil tunnel including the
second magnetically permeable housing portion and at least substantially through the
magnetically permeable armature assembly in the first direction.
The present magnetic path, commonly referred to as an alternating current path, is dependent on
the signal supplied to the coil and is passed through the air gap by the armature assembly.
In this case, the armature assembly and the diaphragm element vibrate. A second housing part is
provided to optimize the magnetic path for increased efficiency of the container 10.
[0059]
Each of these embodiments and obvious variations thereof are construed as being included in the
spirit and scope of the claimed invention in the appended claims.
Explanation of sign
[0060]
10 Containment 12 Armature assembly 14 Fixed end 16 Movable end 18 Coil 20, 22 Permanent
magnet 24 Diaphragm element 26 Side of diaphragm element (suspension element) 28 Sealing
member 29, 31 Chamber 30 Sound output part
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