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JP2010021785

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DESCRIPTION JP2010021785
An electromagnetic converter is provided which suppresses abnormal noise due to divided
vibration of a vibrating membrane. SOLUTION: A permanent magnet disposed on different
magnetic poles alternately at a predetermined interval, and a meander-shaped conductor coil
disposed on a thin film resin surface disposed opposite to the permanent magnet, the conductor
coil And a frame supporting the permanent magnet and the vibrating film so as to cover the
permanent magnet and the vibrating film, and the vibrating film is disposed at a position where
the surface of the vibrating film is divided. It is sandwiched and supported by the provided resin
body. [Selected figure] Figure 1
Electromagnetic converter
[0001]
The present invention relates to an electromagnetic converter that performs sound reproduction
from an audio signal by combining a permanent magnet and a diaphragm.
[0002]
In a rectangular electromagnetic transducer using a permanent magnet plate and a vibrating
membrane, the permanent magnet plate and the vibrating membrane are disposed to face each
other, and a buffer material is disposed between the permanent magnet plate and the vibrating
membrane. There is something.
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The permanent magnet plate, the vibrating membrane, and the buffer member are covered so as
to be sandwiched by members such as a frame and attached to, for example, a speaker housing.
The above-mentioned permanent magnet plate has strip-like magnetized portions (also referred
to as multipolar magnetized patterns) alternately made into different polarities at regular
intervals. In addition, the vibrating film is a meandering conductor pattern (serpentine coil) that
acts as an electromagnetic coil, facing a position facing a gap at a boundary of different polarity
of the permanent magnet plate, a portion called a so-called magnetized neutral zone ) Is provided
on the surface of the vibrating film. When the current of the audio signal flows through the
meandering coil pattern formed on the vibrating membrane, the meandering coil pattern and the
multipolar magnetization pattern of the permanent magnet plate are electromagnetically
coupled, and the above meandering coil pattern is formed according to Fleming's law. The
vibrating membrane vibrates by acting. Sound waves generated by this vibration are emitted
through a sound hole formed in a permanent magnet plate and a frame to perform audio
reproduction (see, for example, Patent Document 1). Moreover, in order to prevent the conductor
coil formed on the vibrating membrane from breaking due to metal fatigue due to such vibration,
a stiffening member is provided on the vibrating membrane (see, for example, Patent Document
2). In addition, there has conventionally been an ultra-thin speaker called "gamouson type",
which has a configuration similar to that of the above-described electromagnetic converter and is
replaced with the above-mentioned permanent magnet plate and has a rod-like magnet
configuration. The same poles of the rod-like magnet are made to face each other (N and N poles,
or S and S poles), and different polarities are alternately arranged in the direction of arrangement
perpendicular to the rod-like magnets. It consists of the same as above. Such an ultra thin
speaker has a diaphragm formed by attaching copper or aluminum foil to a thin film made of
polyester or polyimide and etching a voice coil pattern (see, for example, Non-Patent Document
1) ). According to this configuration, the sound generation operation of audio reproduction is also
the same as the above-described electromagnetic converter.
[0003]
Patent No. 3192372 gazette Takeo Yamamoto ed., Speaker system, Radio Technology Co., Ltd.,
July 1977 issue
[0004]
In any of the above-described electromagnetic transducers, the vibrating film is an
electromagnetic transducer of a full drive system in which the driving force by the meandering
coil pattern is uniformly generated on the vibrating surface.
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In other words, the vibration film serves as a piston sound source to realize an electromagnetic
converter exhibiting flat sound pressure frequency characteristics. However, in practice, it is
difficult for the vibrating membrane to generate a uniform driving force over the entire band to
cause piston vibration, and in particular, as the aspect ratio of the vibrating membrane is
increased, the vibrating membrane is likely to generate divided vibrations, As shown in FIGS. 4
(a) and 4 (b), there has been a problem that the partial large amplitude of the divided vibration of
the diaphragm causes the magnet to contact and generate noise. In addition, there is a problem
that the sound pressure frequency characteristic is disturbed by the divided vibration of the
vibrating film and the sound pressure is deteriorated.
[0005]
The present invention has been made to solve the above-described problems, and an object of the
present invention is to provide an electromagnetic transducer having flat sound pressure
frequency characteristics by suppressing divided vibration of a vibrating film.
[0006]
In the electromagnetic converter according to the present invention, permanent magnets
disposed on different magnetic poles alternately at predetermined intervals, and permanent
magnets disposed opposite to the permanent magnets, meander-shaped conductor coils are
formed on a thin film resin surface And a vibrating membrane that is electromagnetically coupled
to the permanent magnet by energizing the conductor coil and vibrates in the thickness direction,
and a frame that supports the permanent magnet and the vibrating membrane so as to cover the
vibrating membrane. And is supported by being sandwiched between resin bodies provided at
dividing positions.
[0007]
According to the electromagnetic converter of the present invention, since the resin body
sandwiches the portion corresponding to the antinode of the divided vibration of the vibrating
film to support the vibrating film, the divided vibration of the vibrating film can be suppressed.
Sound pressure frequency characteristics can be made flat and stable.
In addition, since no weight is added to the vibrating membrane itself, the influence on the
driving of the vibrating membrane can be reduced.
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[0008]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
Embodiment 1 FIG. 1 is a view showing the configuration of the electromagnetic converter 1 of
the present invention, and FIG. 1 (a) is an overall perspective view showing the appearance of the
electromagnetic converter 1, and FIG. 1 (b) is a configuration of the electromagnetic converter 1.
It is a disassembled perspective view shown. FIG. 2 is a view showing the structure of the
electromagnetic converter 1 of the first embodiment, and FIG. 2 (a) is a cross-sectional view
taken along the line A-A of FIG. 1 (a); FIG. 2 (c) is a cross-sectional view showing an operation
state of the electromagnetic converter 1 of the first embodiment, taken along the line B-B of a).
[0009]
The electromagnetic transducer 1 comprises a vibrating membrane 10, resin bodies 11, 12,
permanent magnets 21, 22 and a frame 30, and the upper frame 31 and the lower frame 32 of
the frame 30 are the vibrating membrane 10, the resin body 11 and the permanent magnet It
supports so that 21 and 22 may be covered.
[0010]
The vibrating film 10 is composed of a base material 10a made of a rectangular thin polymer
resin sheet, and a conductor coil (coil) 10b formed in a meandering shape on the surface of the
base material 10a, and a conductor coil made of a meander pattern 10b is formed by punching a
metal foil with a press or etching.
[0011]
The resin bodies 11 and 12 are formed, for example, of a resin material having elasticity, such as
urethane, in a plate-like rectangular solid, and are fixed along the inner walls of the frames 31
and 32.
Further, the upper resin body 11 and the lower resin body 12 support the vibrating membrane
10 so as to sandwich the both sides in the longitudinal direction of the vibrating membrane 10.
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[0012]
The permanent magnets 21 and 22 are arranged so that the strip magnet made of the magnetic
material is magnetized and the magnetic poles of the faces of the adjacent strip magnets facing
the vibrating film 10 alternately become different magnetic poles. An adhesive or the like is fixed
to the surface facing the vibrating membrane 10 at a predetermined interval.
[0013]
The frame 30 is a rod structure having the inside of a cavity, and the joint surface between the
upper frame 31 and the lower frame 32 sandwiches and supports a portion (not shown)
protruding from both sides of the vibrating membrane 10.
Further, the resin bodies 11 and 12 are attached with an adhesive or the like to the surface of the
frame 30 facing the vibrating membrane 10, and the surface of the vibrating membrane 10 is
approximately 3 in the longitudinal direction via the resin bodies 11 and 12. It supports at the
position divided into equal parts.
Band-shaped permanent magnets 21 and 22 are fixed at predetermined intervals on the surface
facing the vibrating membrane 10, and at predetermined intervals of the permanent magnets 21
and 22, circular sound emission penetrating from the inner wall to the outside Holes 31a and
32a are provided at regular intervals.
[0014]
Next, a method of assembling the electromagnetic converter 1 will be described. The positioning
is performed by jigs or the like on the inner surfaces of the upper and lower frames 31 and 32,
and the permanent magnets 21 and 22 are adhered and held with an adhesive, and the resin
bodies 11 and 12 along the inner walls of the frames 31 and 32 Glue and hold with adhesive.
The frames 31, 32 are fitted so as to cover the vibrating film 10 on which the conductor coil 10b
has been previously formed. By assembling in this manner, the vibrating film 10 is sandwiched
between the resin bodies 11 and 12.
[0015]
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Here, the conductor coil 10b of the diaphragm 10 and the permanent magnets 21 and 22 are
formed such that the conductor coil 10b is disposed at a position opposed to a predetermined
interval between the permanent magnets 21 and 22 fixed to the frame 30. In the present
invention, the conductor coil 10b of this portion is referred to as a straight portion, and a portion
orthogonal to the longitudinal direction of the strip magnet is referred to as a folded portion.
[0016]
In addition, the vibrating membrane 10 has any characteristics such as electromagnetic
conversion having any characteristic such as suppressing the maximum amplitude by
sandwiching and supporting the antinode portion where the resin bodies 11 and 12 maximizes
the amplitude of divided vibration of the vibrating membrane 10. The holding position is
determined depending on whether the container is designed, and the resin bodies 11 and 12 in
the first embodiment have vibration with two waves by six resin bodies 11 and 12 on three sides
of one side. The vibrating membrane 10 comes in contact with the permanent magnets 21 and
22. However, with the configuration in which eight resin bodies 11 and 12 are used on four sides
of each side to support at four points, vibration with three waves (3/2 Assuming that the
vibrating membrane 10 does not contact the permanent magnets 21 and 22 at maximum output
if divided vibration for the wavelength), four places using eight resin bodies 11 and 12 on four
sides Is a configuration supported by
[0017]
Next, the operation will be described.
FIG. 4 is a diagram showing divided vibration of the conventional electromagnetic converter 100,
and FIG. 4 (a) is a vibration state in the case where the divided vibration of the vibrating
membrane 110 is a half wavelength, and FIG. 4 (b) is a vibration. The divided vibration of the film
110 shows a vibration state in the case of one wavelength.
[0018]
In the conventional electromagnetic transducer 100, as the aspect ratio of the vibrating
membrane 110 increases, for example, as shown in FIGS. 4A and 4B, the vibrating membrane
110 is likely to be divided and vibrated, resulting in partial The large amplitude causes the
permanent magnets 21 and 22 to generate noise.
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Also, the sound pressure frequency characteristics are disturbed by the divided vibration.
[0019]
By adopting the above configuration, the electromagnetic transducer 1 of the first embodiment is
supported so that the vibrating membrane 10 is sandwiched by the frame 30 via the resin body
11 as shown in FIG. Generate audio oscillations at multiple amplitudes with reduced large
amplitudes. For example, as shown in FIG. 2C, the surface of the vibrating film 10 is supported so
as to be divided, and it is divided into three between the resin bodies 11 and vibrated, so that the
vibrating film 10 is a permanent magnet without large amplitude. There is no contact with 21
and 22. As described above, since the plurality of amplitudes are not in contact with the
permanent magnets 21 and 22, noise does not occur, and the sound pressure frequency
characteristic becomes flat and stable.
[0020]
As described above, according to the electromagnetic converter 1 of the first embodiment, the
resin body 11 supported at the position where the longitudinal direction of the surface of the
thin and flexible diaphragm 10 is divided is supported by being sandwiched by the frame 30
Since the partial large amplitude of the divided vibration is suppressed, it is possible to prevent
the generation of abnormal noise and the disturbance of the sound pressure frequency
characteristic.
[0021]
Second Embodiment
FIG. 3 is a view showing the structure of the electromagnetic converter 1 of the second
embodiment, and FIG. 3 (a) is a cross-sectional view taken along the line A-A of FIG. FIG. 3 (c) is a
cross-sectional view showing the operating state of the electromagnetic converter 1 of the
second embodiment.
[0022]
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In the first embodiment, the longitudinal direction of the surface of the vibrating membrane 10 is
supported by the resin bodies 11 and 12 fixed to the frame 30 so as to be divided. However, the
electromagnetic converter 1 of the second embodiment is a frame The resin bodies 11 and 12
are adhered and fixed to the surfaces of the permanent magnets 21 and 22 fixed to 30 facing the
vibrating membrane 10. In addition, about the structure similar to the electromagnetic converter
1 of Embodiment 1, it shall be shown with the same number also in the figure, and the
description is abbreviate ¦ omitted.
[0023]
The upper resin body 11 is disposed on the surface of every other permanent magnet 21 facing
the vibrating membrane 10, and is adhered and fixed by an adhesive or the like. Similarly, the
lower resin body 12 is disposed and fixed on the surface of the every other permanent magnet
22 facing the vibrating membrane 10. As described above, the resin bodies 11 and 12 are
configured to be supported at five points using ten resin bodies 11 and 12 on five surfaces on
one side, and vibration with four waves (divided vibration for two wavelengths) In this
configuration, assuming that the vibrating membrane 10 does not contact the permanent
magnets 21 and 22 at the maximum output, the configuration is supported at five points using
ten resin bodies 11 and 12 on five sides of each side. is there.
[0024]
Next, a method of assembling the electromagnetic converter 1 will be described. Positioning is
performed on the inner surfaces of the upper and lower frames 31 and 32 with a jig or the like to
bond the permanent magnets 21 and 22 with an adhesive. Subsequently, the resin bodies 11 and
12 are adhered and held by an adhesive on the surfaces of the permanent magnets 21 and 22
facing the vibrating film 10 and the inner wall side surfaces of the frames 31 and 32. The frames
31, 32 are fitted so as to cover the vibrating film 10 on which the conductor coil 10b has been
previously formed. By assembling in this manner, the vibrating film 10 is sandwiched between
the resin bodies 11 and 12.
[0025]
As described above, the electromagnetic converter 1 according to the second embodiment can
suppress the partial large amplitude due to the divided vibration by using the above
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configuration, and the same as the electromagnetic converter 1 according to the first
embodiment. The effect can be obtained, and since the sound output holes 31a and 32a provided
in the frames 31 and 32 are not blocked, the sound field can be formed without any influence.
[0026]
As described above, the electromagnetic transducer according to the present invention is
configured to be supported through the resin bodies provided above and below so as to divide
the surface of the vibrating film, so partial A large amplitude can be suppressed, generation of
abnormal noise can be prevented, and sound pressure frequency characteristics can be made flat
and stable.
In addition, the configuration in which the diaphragm is not loaded does not disturb the vibration
of the diaphragm itself.
[0027]
In the electromagnetic converter 1 of the present invention, although the conductor coil 10b
having a meandering pattern is described as being formed on the surface of the vibrating film 10,
in order to convert the electric signal more faithfully as audio vibration, The conductor coil 10 b
may be formed on both sides of the vibrating membrane 10.
[0028]
Further, in the electromagnetic converter 1 of the present invention, although the strip-like
permanent magnets 21 and 22 which are magnetized are used, they may be fixed after being
fixed to the frame 30, and they may differ in a strip at predetermined intervals. A permanent
magnet plate in which the magnetic poles are alternately magnetized may be used.
[0029]
Further, the arrangement of the conductor coil 10b and the permanent magnets 21 and 22
formed on the vibrating film 10 shown in the first to third embodiments of the present invention
is not limited to this combination, and, for example, the length of the electromagnetic converter 1
The meandering shape may be formed in the direction as the longitudinal linear portion of the
conductor coil 10b, and the longitudinal direction of the strip-like permanent magnets 21 and 22
may be arranged in the longitudinal direction of the electromagnetic transducer 1.
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[0030]
Although the resin bodies 11 and 12 in the present invention are described as being made of a
resin such as urethane, elastic materials such as foam rubber and silicon rubber are also suitable,
and materials having excellent heat resistance are suitable.
[0031]
Further, the resin bodies 11 and 12 in the present invention are disposed at the folding portion
of the meander pattern, for example, because the conductor coil 10b of the vibrating membrane
10 exceeds 100 ° C., and the contact portion with the conductor coil 10b is as small as possible.
Is preferred.
[0032]
The permanent magnets 21 and 22 of the electromagnetic converter 1 of the present invention
are bonded magnets formed by mixing magnetic material (neodymium, samarium-cobalt, ferrite,
etc.) powder and a binder (resin, rubber) to form a strip. For example, compared with a sintered
magnet, it can manufacture at low cost, and can also make degree of freedom of shape etc. high.
[0033]
In the electromagnetic converter 1 according to the present invention, the circular sound
emission holes 31a and 32a are described. However, the shape of the sound emission holes 31a
and 32a is not limited to a circular shape. The shape and the size are designed according to the
purpose so that the vibration can be radiated efficiently.
[0034]
Moreover, each figure shown by embodiment of this invention is exaggerated and expanded and
shown for description, and relations, such as thickness of each structure, may differ from reality.
[0035]
It is the (a) perspective view and the (b) disassembled perspective view which show the external
appearance of the electromagnetic transducer 1 of this invention.
(A) A-A line sectional view showing the configuration of the electromagnetic transducer 1 of the
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first embodiment, (b) B-B line sectional view, and (c) A-A line sectional view showing the
operation time of the vibrating film 10 It is.
(A) A-A line sectional view showing the configuration of the electromagnetic transducer 1 of the
second embodiment, (b) B-B line sectional view, and (c) A-A line sectional view showing the
operation time of the vibrating film 10 It is.
FIG. 8A is a diagram showing a case where the divided vibration corresponds to a half
wavelength when (a) a divided vibration corresponds to a half wavelength when the diaphragm
100 of the conventional electromagnetic converter 10 contacts the permanent magnets 21 and
22;
Explanation of sign
[0036]
DESCRIPTION OF SYMBOLS 1 electromagnetic transducer, 10 vibrating film, 10a base material,
10b conductor coil (coil), 11, 12 resin body, 21 upper permanent magnet, 22 lower permanent
magnet, 30 frame, 31 upper frame (frame), 31a, 32a Sound emission hole, 32 lower frame
(frame).
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