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JPH1169487

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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 JPH1169487
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer, and more particularly, a diaphragm made of a magnetic material is
passed a magnetic flux along its plate surface and a current is made to flow in a direction
intersecting the magnetic flux. The invention relates to a full drive speaker that vibrates
[0002]
2. Description of the Related Art An electro-acoustic transducer for acoustically vibrating a
diaphragm by passing a magnetic flux along a plate surface of a diaphragm made of a magnetic
material and supplying an audio current in a direction intersecting the magnetic flux is disclosed
in, for example, It is well known as described in JP-A-14936.
[0003]
In this device, as shown in FIG. 9, the magnetic poles 14 and 15 of the magnets 11 and 11 'are
bridged by a diaphragm 13 made of a metallic magnetic material, and magnetic flux is generated
in the diaphragm 13 as shown by arrow 18 The sound current is made to flow through the lead
wires 16 and 17 to the diaphragm 13 as indicated by the dotted arrow, in the direction crossing
the magnetic flux.
[0004]
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1
In this device, due to the interaction between the magnetic flux and the current in the diaphragm
13, the diaphragm 13 vibrates in the direction orthogonal to the directions of the magnetic flux
and the current, and generates a sound corresponding to the current.
That is, it becomes an electroacoustic transducer.
[0005]
The above-described electroacoustic transducer uses a magnet to generate a magnetic flux.
The magnet needs a certain size in order to obtain the magnetic flux density necessary for the
electroacoustic conversion, which limits the thinning of the electroacoustic transducer as long as
the magnet is used.
[0006]
The present invention has been made to solve the above-mentioned problems, and an object
thereof is to realize a full drive speaker which can be easily thinned.
[0007]
SUMMARY OF THE INVENTION (1) The invention of claim 1 for solving the problems comprises:
a conductive plate member; an energizing means for passing a current parallel to the plate
surface to the plate member; A conductive magnetic film electrically insulatingly deposited on at
least one surface of the plate member and constituting a magnetic path for passing a magnetic
flux generated by the current and an electric path for passing a current linked to the magnetic
flux of the magnetic path And supporting means for vibratably supporting the plate member to
which the magnetic film is attached.
[0008]
In the first aspect of the present invention, the magnetic flux due to the current flowing through
the plate member is concentrated in the magnetic film.
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Then, due to the interaction with the magnetic flux in the magnetic film, the plate member
vibrates in accordance with the current applied from the outside to the electric path.
[0009]
(2) In the invention of claim 2 for solving the problem, in the invention of claim 1, the magnetic
films are separated so as to be parallel to each other in the direction intersecting with the
magnetic flux, and currents in the same direction as each other And a plurality of strips
connected in series so as to flow.
[0010]
According to the second aspect of the invention, the vibration is efficiently generated by the
current flowing through the plurality of serially connected strips.
(3) The invention of claim 3 for solving the problem is characterized in that, in the invention of
claim 1 or claim 2, the support means has a second plate member for supporting the plate
member.
[0011]
According to the third aspect of the present invention, the second plate member is a diaphragm
integrated with the plate member to which the magnetic film is attached, and the vibration
characteristic thereof governs the frequency characteristic of the electroacoustic conversion.
(4) In order to solve the problem, the invention according to claim 4 comprises a conductive
member having a continuous flat pattern of spiral or meander shape, and a conducting means for
passing an electric current along the pattern to the conductive member; The magnetic path is
electrically insulated and attached to at least one plane along the pattern of the conductive
member, and a magnetic path for passing the magnetic flux generated by the current and an
electric path for passing the current intersecting the magnetic path of the magnetic path are
provided. A conductive magnetic film and support means for vibratably supporting the
conductive member on which the magnetic film is deposited are provided.
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3
[0012]
In the invention of claim 4, the magnetic flux due to the current flowing through the conductive
member having a continuous flat pattern is concentrated in the magnetic film. Then, the
interaction with the magnetic flux in the magnetic film causes the vibration of the conductive
member according to the current applied from the outside to the electric path.
[0013]
(5) The invention of claim 5 for solving the problem is that, in the invention of claim 4, the
support means comprises a support plate member for supporting the conductive member to
which the magnetic film is attached. It features.
[0014]
In the invention of claim 5, the support plate member is a diaphragm integrated with the
conductive member on which the magnetic film is deposited, and the vibration characteristic
thereof governs the frequency characteristic of the electroacoustic conversion.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described in detail with reference to the drawings.
The present invention is not limited to the embodiment.
[0016]
(First Example of the Embodiment of the Invention) FIG. 1 shows a schematic configuration of a
full drive speaker.
The present speaker is a first example of the embodiment of the present invention.
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[0017]
(Configuration) The configuration of the present speaker will be described. As shown in FIG. 1,
the present speaker has a conductive plate member 2. The plate member 2 is an example of the
embodiment of the plate member in the present invention. The plate member 2 is configured
using, for example, a conductive material such as copper or aluminum.
[0018]
Conductive magnetic films 4 and 4 ′ are respectively deposited on both sides of the plate
member 2. The magnetic films 4 and 4 'are examples of embodiments of the magnetic film in the
present invention. Only one of the magnetic films 4 and 4 'may be provided. An example in which
magnetic films are provided on both sides will be described below.
[0019]
The magnetic films 4 and 4 'are formed, for example, by plating or sputtering a high magnetic
permeability metal magnetic material such as permalloy. The metallic magnetic material may be
not only permalloy but also other high permeability alloys. Metal magnetic materials generally
have conductivity.
[0020]
Insulating layers 6, 6 'are interposed between the plate member 2 and the magnetic films 4, 4'.
The insulating layers 6, 6 'are made of, for example, a film of a polymeric insulating material
such as polyester. In addition, an oxide film layer, an adhesive layer, or the like formed on the
surface of the plate member 2 may be used.
[0021]
The plate member 2 having the magnetic films 4 and 4 'deposited on both sides thereof
constitutes a diaphragm 8. The diaphragm 8 is supported at both ends in the x direction in the
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drawing by the support members 10 and 10 '. The support members 10 and 10 'are an example
of the embodiment of the support means in the present invention.
[0022]
An electric current is conducted to the plate member 2 in the y direction in the figure, that is, for
example, the direction of the arrow 22. The current is provided as a constant current of, for
example, a direct current from a current source not shown. The current supply source is an
example of the embodiment of the energizing means in the present invention. The current value
can be changed by using a variable output as a current supply source.
[0023]
The current flowing through the plate member 2 generates a magnetic field, which generates a
magnetic flux around the plate member 2. The magnetic flux is concentrated on and passes
through the magnetic films 4 and 4 'of high magnetic permeability deposited on both surfaces of
the plate member 2. That is, the magnetic films 4 and 4 'constitute a magnetic path.
[0024]
The magnetic flux travels around the plate member 2 by passing through the magnetic films 4
and 4 'in the x direction in the drawing, as indicated by a broken arrow 24, for example. Such a
circulating magnetic flux is formed over the entire length of the plate member 2 in the y
direction.
[0025]
For example, when the thickness of the plate member 2 is 5 μm, the width is 500 μm, and the
thicknesses of the magnetic films 4 and 4 ′ and the insulating layers 6 and 6 ′ are all 2.5 μm,
a current of 1 A is applied to the plate member 2 As a result, a magnetic flux having a magnetic
flux density of about 0.8 T (Tesla) can be generated in the magnetic films 4 and 4 '. That is, it is
possible to obtain the same magnetic flux density as in a normal speaker using a magnet.
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[0026]
FIG. 2 shows a simulation result of the magnetic flux density distribution in the magnetic film 4.
As shown in the figure, a magnetic flux density of 0.821 to 0.826 T can be obtained in the range
of 0.00015 to 0.00035 m in the x direction of the magnetic film 4.
[0027]
The magnetic flux density tends to be higher as the layers of the diaphragm 8 are thinner.
Further, by adjusting the value of the current flowing through the plate member 2, the magnetic
flux density in the magnetic films 4 and 4 'can be adjusted.
[0028]
A current is input to the magnetic films 4 and 4 'along the y direction, that is, the direction of the
arrows 26 and 26'. These currents are input from a current input circuit (not shown).
[0029]
The magnetic films 4, 4 'also constitute an electrical path for the input current. The current
flowing through this electrical path is linked to the magnetic flux in the magnetic films 4, 4 '.
That is, an electrical passage that interlinks with the magnetic passage is configured.
[0030]
(Operation) The operation of the present speaker will be described. Currents are input from the
current input circuit (not shown) to the magnetic films 4 and 4 'along the directions of the
arrows 26 and 26'. The direction of the current is reversed in the magnetic films 4 and 4 '. To
flow such current, it is convenient to connect the magnetic films 4 and 4 'in series at the rear end
in the figure. As a result, one of the magnetic films 4 and 4 'becomes the forward path and the
other becomes the return path, and currents of the same value flow in opposite directions.
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[0031]
These currents interlink with the magnetic flux in the magnetic films 4 and 4 'respectively.
Therefore, due to the interaction between the magnetic flux and the current, a force acts on the
magnetic films 4 and 4 'in the direction perpendicular to the directions of the magnetic flux and
the current, that is, as shown by the arrow 28. .
[0032]
This force acts almost equally over the entire surface of the magnetic films 4 and 4 '. As the
polarities of the currents supplied to the magnetic films 4 and 4 'are opposite to each other, a
force acts on the magnetic films 4 and 4' in the same direction.
[0033]
When the supplied current is, for example, a voice current, the acting force fluctuates, whereby
the diaphragm 8 vibrates. This vibration generates compressional waves in the surrounding air.
That is, the electrical signal is converted to an acoustic signal.
[0034]
The present speaker can be easily thinned or downsized because it does not use a magnet.
Thinning or miniaturization is increasingly advantageous in that the thickness of each layer of
the diaphragm 8 is reduced to increase the magnetic flux density in the magnetic films 4 and 4 '.
Further, it is easy to make the current supply source for magnetic flux generation and the current
input circuit for signal input thinner or smaller using semiconductor integrated circuit
technology. Therefore, the present speaker is a full drive speaker suitable for thinning.
[0035]
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8
An array-type full-drive speaker can be configured by using a plurality of thin-type speakers. The
array can be configured as either a one dimensional array, a two dimensional array or a three
dimensional array. When an array is configured, the directivity of the sound can be freely
adjusted by using the phased array method, and the convenience is improved.
[0036]
Moreover, since the generation of magnetic flux involved in electroacoustic conversion is
performed by the current flowing through the plate member 2, the magnetic flux density can be
adjusted by adjusting this current, whereby the sensitivity of the electroacoustic conversion can
be freely adjusted. can do.
[0037]
In addition, the current flowing through the plate member 2 can also be used as the input signal.
In that case, an acoustic output corresponding to the product of the input signal and the current
input to the magnetic films 4 and 4 'can be obtained.
[0038]
In addition, the current supplied to the magnetic films 4 and 4 'can be made unique input signals.
In that case, an acoustic output corresponding to their algebraic sum can be obtained.
Furthermore, by combining the above two methods, it is possible to obtain a three-input fully
driven speaker.
[0039]
The above description is an example in which the magnetic films 4 and 4 'are provided so as to
continuously cover the surface of the plate member 2. However, as shown in FIG. 3, for example,
the magnetic films 4 and 4' The plurality of strips 41 may be connected in series by the lead
wires 42 so as to form a plurality of parallel strips 41 in the direction of movement. The striated
body 41 is an example of the embodiment of the striated body in the present invention. By doing
this, since the same current repeatedly links with the magnetic flux a plurality of times, efficient
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9
acoustic oscillation per current can be generated.
[0040]
When the magnetic film is provided only on one side of the plate member 2, for example, as
shown in FIG. Also in this case, the same current can be repeated plural times to link with the
magnetic flux, and efficient acoustic oscillation per current can be generated.
[0041]
Second Example of the Embodiment of the Invention FIG. 5 shows a schematic configuration of a
second example of the embodiment of the present invention. In FIG. 5, the same parts as those in
FIG. As shown in the figure, the diaphragm 8 is closely attached on the support plate 20. The
diaphragm 8 may be as shown in FIG. 3 or FIG.
[0042]
Thus, the support plate 20 is integrated with the diaphragm 8 to form a diaphragm 8 '. In the
diaphragm 8 ', the thickness of the support plate 20 occupies most of the plate thickness.
[0043]
The support plate 20 is an example of embodiment of the 2nd plate member in this invention.
The current supply lines 32 and 32 ′ are connected to the plate member 2 of the diaphragm 8.
The current input lines 34 and 34 'are connected to the magnetic films 4 and 4' of the diaphragm
8, respectively. The magnetic films 4 and 4 'are electrically connected to each other at the rear
end in the figure.
[0044]
Both ends of the support plate 20 in the x direction in the drawing are supported by the support
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members 10 and 10 '. The vicinity of both ends of the support plate 20 is formed in a wave
shape, and constitutes an edge portion of the diaphragm 8 '.
[0045]
The support plate 20 is made of, for example, a plate or a film of a polymeric material such as
polyester. The support plate 20 is not limited to polyester but may be made of other resin
material such as polyethylene or polyimide.
[0046]
The vibration characteristics of the diaphragm 8 'are governed by the mechanical characteristics
of the support plate 20 which occupies most of the thickness. Therefore, by selecting the
material and thickness of the support plate 20, the vibration characteristics of the diaphragm 8
'can be changed. This increases the degree of freedom in design and makes it easier to design
sound quality and the like.
[0047]
Third Example of the Embodiment of the Invention FIG. 6 shows a third example of the
embodiment of the present invention. (A) of the figure is a top view, (b) is an AA sectional view.
In addition, illustration of one part is abbreviate | omitted in (b) of FIG.
[0048]
(Configuration) The configuration of the present speaker will be described. As shown in FIG. 6,
the present loudspeaker has a diaphragm 8 ''. The diaphragm 8 '' has a disk shape. A disk-shaped
diaphragm is preferable in that it has no directivity and no anisotropy. In addition, not only a disk
but a plate of an appropriate shape such as an oval or quadrilateral can be used as the
diaphragm 8 ''.
[0049]
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11
The diaphragm 8 ′ ′ is supported at its periphery by the support member 10. The support
member 10 has a cylindrical shape. The back surface of the peripheral portion of the diaphragm
8 ′ ′ is fixed to the end surface of the cylinder, for example, by bonding or the like. The
corrugated portion 82 is formed on the diaphragm 8 ′ ′ along the inner periphery of the
support member 10. The corrugated portion 82 constitutes a so-called edge of the diaphragm 8
''.
[0050]
A circuit pattern 60 is provided on the diaphragm 8 ''. The circuit pattern 60 has a flat spiral
pattern and is fixed to the surface of the diaphragm 8 ''. The center of the swirl coincides with the
center of the diaphragm 8 ''. The number of turns of the spiral is, for example, several tens of
turns. The number of turns may be an appropriate value as needed.
[0051]
The circuit pattern 60 has a multilayer structure. The multilayer structure of the circuit pattern
60 is similar to that of the diaphragm 8 shown in FIG. A multilayer circuit pattern 60 is
integrated with the diaphragm 8 ''. An enlarged view of the cross section of this integral structure
is shown in FIG. In FIG. 7, the plate member 2 is an example of the embodiment of the conductive
member in the present invention. The circuit pattern 60 may be integrally molded on the
diaphragm 8 ''. This is preferable in that the integration is more complete.
[0052]
In the integral structure, most of the thickness is occupied by the thickness of the diaphragm 8 ''.
Diaphragm 8 '' is an example of embodiment of the support plate member in this invention. The
diaphragm 8 '' and the support member 10 are an example of the embodiment of the support
means in the present invention. Like the support plate 20 shown in FIG. 3, the diaphragm 8 ′ ′
is made of, for example, a plate or a film of a polymeric material such as polyester.
[0053]
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12
The vibration characteristics of the integrated structure of the circuit pattern 60 and the
diaphragm 8 '' are governed by the mechanical characteristics of the diaphragm 8 '' which
occupies most of the thickness. Therefore, the vibration characteristic can be changed by
selecting the material and thickness of the diaphragm 8 ''. This increases the degree of freedom
in design and makes it easier to design sound quality and the like.
[0054]
Conductors 80 and 80 'are connected to both ends of the circuit pattern 60, that is, to the center
and the end of the spiral. The conducting wires 80 and 80 'are connected to the plate member 2
so as to be insulated from the magnetic films 4 and 4'.
[0055]
Leads 100 and 100 'are connected to the magnetic films 4 and 4' at one end of the circuit
pattern 60, for example, at the end of the spiral. Further, at the other end of the circuit pattern
60, for example, on the center side of the spiral, the magnetic films 4 and 4 'are connected in
series by a lead wire not shown.
[0056]
The plate member 2 is adapted to be supplied with current from a current source (not shown)
through the leads 80, 80 '. The current is given as, for example, a constant current of direct
current. The current supply source is an example of the embodiment of the energizing means in
the present invention. The current value can be changed by using a variable output as a current
supply source.
[0057]
The current flowing through the plate member 2 generates a magnetic field, which generates a
magnetic flux around the plate member 2 as described in FIG. 1. The magnetic flux is generated
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13
over the entire length of the circuit pattern 60. A current flows in the magnetic films 4 and 4
'through the leads 100 and 100'. The current is supplied from a current input circuit (not
shown). The current input circuit is, for example, an audio current source.
[0058]
(Operation) The operation of the present speaker will be described. A current is input to the
magnetic films 4 and 4 'from a current input circuit (not shown) through the conductors 100 and
100'. The direction of the current is reversed in the magnetic films 4 and 4 '.
[0059]
These currents interlink with the magnetic flux in the magnetic films 4 and 4 'respectively.
Therefore, due to the interaction between the magnetic flux and the current, a force acts on the
magnetic films 4 and 4 'in the direction orthogonal to the directions of the magnetic flux and the
current, that is, in the direction perpendicular to the film surface.
[0060]
This force acts uniformly over the entire surfaces of the magnetic films 4 and 4 ′ and over the
entire length of the circuit pattern 60. Since the directions of the currents flowing through the
magnetic films 4 and 4 'are opposite to each other, a force acts on the magnetic films 4 and 4' in
the same direction. This force acts on the diaphragm 8 ''.
[0061]
If the current supplied is, for example, an audio current, the acting force is varied, which causes
the diaphragm 8 '' to vibrate. This vibration generates compressional waves in the surrounding
air. That is, the electrical signal is converted to an acoustic signal.
[0062]
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14
Since the circuit pattern 60 has a plurality of turns, the input current is multiplied by the number
of turns to contribute to the generation of force. Therefore, the sound pressure per input current
is increased, and the input current is efficiently converted to the sound pressure.
[0063]
If a spiral circuit pattern is also provided on the back surface of the diaphragm 8 ′ ′ and both
circuit patterns are connected in series, it is possible to provide a full-surface drive type speaker
with high efficiency for the input current. Furthermore, if necessary, the circuit pattern can be
formed in multiple layers inside the diaphragm 8 ′ ′ and all of them can be connected in series
to further improve the efficiency.
[0064]
The circuit pattern is not limited to the spiral shape, and may be, for example, a serpentine circuit
pattern 60 'as shown in FIG. In this case, the input current is multiplied by the number of
meanders to contribute to the generation of force. Therefore, the sound pressure per input
current is increased, and the input current is efficiently converted to the sound pressure. In
addition, the circuit pattern can be a continuous pattern of various shapes as needed.
[0065]
Since the present speaker does not use a magnet, it can be easily thinned or downsized. Thinning
or downsizing is advantageous in that the thickness of each layer of the circuit pattern 60 is
reduced and the magnetic flux density in the magnetic films 4 and 4 'is increased. In the case of
thinning or downsizing, the diaphragm 8 '' may be omitted, and the vibrating portion may be
configured by only the circuit pattern 60 or 60 '.
[0066]
As described above in detail, according to the first aspect of the present invention, the magnetic
flux generated by the current flowing through the plate member is concentrated in the magnetic
film adhered thereto, and the magnetic film is externally applied by the interaction with the
magnetic flux. Since the vibration of the plate member is caused according to the current given to
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the above, it is possible to realize a full drive speaker which can be easily thinned.
[0067]
Further, in the invention of claim 2, the magnetic films are a plurality of strips separated in
parallel with each other in the direction intersecting the magnetic flux and connected in series so
as to flow current in the same direction. Thus, vibration is efficiently generated by the current
flowing in series to the plurality of strips.
[0068]
In the third aspect of the present invention, the second plate member is integrated with the plate
member on which the magnetic film is deposited, and the vibration characteristic thereof governs
the frequency characteristic of the electroacoustic conversion. By selecting the plate member, it
is possible to realize an easy-to-throw, easy-to-throw, fully driven speaker whose frequency
characteristics can be adjusted.
[0069]
Further, in the invention of claim 4, the magnetic flux due to the current flowing through the
conductive member forming a continuous flat pattern of spiral or meander is concentrated on the
magnetic film of the conductive member, and the interaction with the magnetic flux in the
magnetic film Since the vibration corresponding to the current applied to the magnetic film from
the outside is generated, it is possible to realize a full drive speaker which can be easily thinned.
[0070]
In the fifth aspect of the invention, since the support plate member and the conductive member
constitute an integral diaphragm, the frequency characteristics can be adjusted by the thickness,
material, etc. of the support plate member.
[0071]
Brief description of the drawings
[0072]
1 is a diagram showing a schematic configuration of an example of the embodiment of the
present invention.
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[0073]
2 is a graph showing a simulation result of the magnetic flux density distribution in the magnetic
film.
[0074]
3 is a diagram showing another configuration example of the diaphragm in an example of the
embodiment of the present invention.
[0075]
4 is a diagram showing another configuration example of the diaphragm in an example of the
embodiment of the present invention.
[0076]
5 is a diagram showing a schematic configuration of an example of the embodiment of the
present invention.
[0077]
6 is a diagram showing a schematic configuration of an example of the embodiment of the
present invention.
[0078]
7 is an enlarged view of a portion of FIG.
[0079]
8 is a diagram showing another example of the circuit pattern in an example of the embodiment
of the present invention.
[0080]
9 is a diagram showing a schematic configuration of a conventional example.
[0081]
Explanation of sign
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[0082]
2 plate member 4, 4 'magnetic film 6, 6' insulating layer 8, 8 ', 8' 'diaphragm 10, 10' support
member 20 support plate 32, 32 'current supply line 34, 34' current input line 41 Body 42 lead
wire 82 wave-shaped portion 60, 60 'circuit pattern 80, 80', 100, 100 'conductor 11, 11' magnet
13 diaphragm 14, 15 pole 16, 17 lead
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