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JP2009177712

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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 JP2009177712
The present invention provides an electromagnetic transducer provided with an edge of a
vibrating film which can be shaped in a simple process for uniformly making the vibrating film
have a large amplitude and controlling the displacement of the vibrating film. A strip-shaped
permanent magnet is arranged at predetermined intervals and magnetized alternately with
different polarities, and vibration in which a meandering coil pattern is formed on the surface is
disposed to face the magnetized surface of the permanent magnet. In an electromagnetic
transducer provided with a membrane, the vibrating membrane is supported via an edge outer
end portion formed by extending an outer peripheral portion outward. [Selected figure] Figure 1
Electromagnetic converter
[0001]
The present invention relates to, for example, an electromagnetic converter that reproduces an
audio signal.
[0002]
Heretofore, various techniques have been proposed for electromagnetic transducers in which
permanent magnets and vibrating membranes are combined.
For example, in an electromagnetic converter comprising a permanent magnet plate, a vibrating
membrane disposed to face the permanent magnet plate, and a buffer member disposed between
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the permanent magnet plate and the vibrating membrane, the permanent magnet plate The
vibration film and the buffer member are supported by inserting the support rods in the holes
provided at the four corners, respectively, and the permanent magnet plate is mechanically and
firmly fixed by the nut, while the vibration film and the buffer member are An electromagnetic
transducer is disclosed which is mounted so as to be freely displaced in the thickness direction
(see, for example, Patent Document 1). In the permanent magnet plate, strip-like different
magnetic poles are alternately formed at regular intervals to form a parallel stripe-shaped
magnetization pattern (hereinafter, this parallel stripe-shaped magnetization pattern is also
referred to as a multipole magnetization pattern The vibrating film is a coil consisting of a
meander-shaped conductor pattern (hereinafter referred to as a meander-shaped conductor) at a
position opposed to a portion called a so-called neutral zone of magnetization of a gap portion
between different magnetic poles of permanent magnet plates. The pattern is also referred to as
a meandering coil pattern) formed on the entire surface. In addition, the buffer member is made
of a non-woven material or the like which is made of a non-woven material or the like to prevent
damage to the pattern of the vibrating membrane or to prevent abnormal noise when the
vibrating membrane contacts the permanent magnet plate. It is provided between the magnet
plate. The permanent magnet plate, the diaphragm and the buffer member are attached to the
speaker housing by being covered by a frame. In this electromagnetic converter, when current
(audio signal) flows in the coil of the diaphragm, the coil and the multipolar magnetization
pattern of the permanent magnet plate are electromagnetically coupled, and audio vibration is
generated in the diaphragm according to the law of Fleming Occurs. In the electromagnetic
transducer configured in this manner, since the diaphragm is not completely fixed, audio
vibration can be generated without being disturbed even in the vicinity of the periphery of the
mounting portion to the support rod. In addition, the diaphragm and each permanent magnet
plate are disposed in parallel at a position separated by a predetermined distance, and a buffer
member made of non-woven fabric or the like is provided in the gap, and when generating audio
vibration This prevents the pattern of the vibrating membrane from being scratched or
generating abnormal noise by contact with the magnet plate.
[0003]
JP 09-331596 A
[0004]
In addition, as this type of electromagnetic converter, for example, there is one in which a part of
a vibrating film is attached and fixed to a frame.
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However, since the structure is firmly fixed with the peripheral portion close to the coil pattern of
the vibrating membrane as a fulcrum, the amplitude of the vibrating membrane can not be
increased, and there is a problem that the audio signal can not be reproduced faithfully. Further,
the electromagnetic transducer disclosed in Patent Document 1 has a problem that the
displacement in the thickness direction of the vibrating film is not controlled, and therefore, the
amplitude can not be uniformly amplified if the amplitude is made large. Furthermore, as a prior
art, there is a method of forming an edge using an elastic member such as rubber for control of a
vibration system, but there is a problem that molding of an edge shape by this method has many
processing steps for shape maintenance. .
[0005]
The present invention has been made to solve the above-described problems, and the edge of the
vibrating film can be formed in a simple process for uniformly making the vibrating film have a
large amplitude and controlling the displacement of the vibrating film. It aims at providing the
provided electromagnetic converter.
[0006]
The electromagnetic converter according to the present invention is arranged at predetermined
intervals and arranged in a strip-like permanent magnet alternately magnetized with different
polarities, facing the magnetized surface of the permanent magnet, and the meandering coil
pattern is on the surface In the electromagnetic transducer provided with the vibrating
membrane formed in the above, the vibrating membrane is supported via the edge outer end
portion formed by extending the outer peripheral portion outward.
[0007]
According to the present invention, since the outer peripheral portion of the vibrating membrane
is supported via the outer edge of the edge extending outward, expansion and contraction of the
outer edge of the edge has an effect of causing the vibrating membrane to have a large amplitude
uniformly.
[0008]
Hereinafter, an embodiment of the present invention will be described.
Embodiment 1
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FIG. 1 (a) is an overall view of an electromagnetic converter according to a first embodiment of
the present invention, and FIG. 1 (b) is an exploded perspective view for explaining the
configuration of the electromagnetic converter.
FIG. 2 is a cross-sectional view showing the arrangement of the electromagnetic transducer, the
vibrating film, and the edge. Fig.2 (a) is AA sectional drawing of FIG. 1, FIG.2 (b) is BB sectional
drawing. FIGS. 3A and 3B are cross-sectional views showing the configuration of the diaphragm
before and after edge forming. FIGS. 4 (a), (b) and (c) are diagrams showing the shape, width, and
type of support point of the edge in the transducer.
[0009]
As shown in FIGS. 1 (a) and 1 (b), the electromagnetic converter 10 is disposed at an
intermediate position opposed to the strip-like upper permanent magnet 11 and lower
permanent magnet 12, and the upper and lower permanent magnets 11, 12. An upper spacer 13
and a lower spacer 14 for arranging the vibrating film 15 and the upper and lower permanent
magnets 11 and 12 and the vibrating film 15 at a constant interval, and the upper and lower
permanent magnets 11 and 12 and the vibrating film 15 And the upper and lower spacers 13
and 14 by a frame 20 (upper frame 21, lower frame 22).
[0010]
As shown in FIG. 2A, the upper and lower permanent magnets 11 and 12 sandwich the coil
pattern of the vibrating film 15 on the surface facing the vibrating film 15 of the upper frame 21
and the lower frame 22 to form different magnetic poles Magnets of (N pole, S pole) are
alternately arranged at predetermined intervals and fixed to the upper frame 21 and the lower
frame 22, respectively.
[0011]
The upper and lower spacers 13 and 14 have a thickness that allows the upper and lower
permanent magnets 11 and 12 and the vibrating film 15 to have a certain distance, as shown in
FIGS. 1 (b) and 2 (a) and 2 (b). It has a frame shape, and is configured such that the vibrating
membrane 15 can vibrate inside the frame.
[0012]
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As shown in FIG. 1 (b) and FIGS. 2 (a) and 2 (b), the vibrating membrane 15 is a coil having a
meander-shaped conductor pattern on both sides of a thin and flexible rectangular resin film
15a. A coil pattern (also referred to as a coil pattern) 15b is formed by printed wiring or the like.
Straight portions in the longitudinal direction of the meandering coil pattern 15b formed on one
surface of the resin film 15a are provided to be opposed to intermediate positions of different
magnetic poles (N pole, S pole) of the permanent magnet 11.
Further, linear portions in the longitudinal direction of the meandering coil pattern 15b similarly
formed on the other surface are provided to be opposed to intermediate positions of different
magnetic poles (N pole, S pole) of the permanent magnet 12.
[0013]
Here, as shown in FIG. 2B, an edge portion (edge outer end portion) 16 is provided on both ends
of the vibrating membrane 15 by extending the outer peripheral portion of the vibrating
membrane 15 to the outside. The portion 16 is plastically processed by a press machine or the
like and is formed in a wave shape in the direction of the permanent magnets 11 and 12.
The edge portion 16 is bonded so as to be sandwiched by the upper spacer 13 and the lower
spacer 14 so that the vibrating membrane 15 is supported by the frame 20.
[0014]
FIG. 3A is a cross-sectional view of the vibrating film 15 before edge forming. The vibrating film
15 has a layer structure in which the conductor portion of the meander-shaped conductor
pattern 15b is sandwiched from both sides of the resin film 15a. FIG. 3 (b) is a view showing a
cross section of the vibrating membrane 15 after the edge molding of the present invention. The
wavy edge portion 16 has a layer structure in which the conductor portion of the meandershaped conductor pattern 15b is sandwiched from both sides of the resin film 15a, similarly to
the vibrating film 15. That is, the edge part 16 is comprised from the meandering coil pattern
15b which extends the vibrating film 15 and sandwiches the resin film 15a and the resin film
15a, and is shape | molded by the wave shape. With such a structure, the rigid conductor of the
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edge portion 16 is configured to have elasticity.
[0015]
In the upper frame 21 and the lower frame 22 of the frame 20, radiation sound holes 21a and
22a for radiating audio vibration are formed on the surface of the diaphragm 15 facing the
meandering coil pattern 15b.
[0016]
In the first embodiment, the edge portion 16 is formed into a wave shape of one cycle, but the
number of cycles of the wave shape may be appropriately designed according to the required
elasticity.
Further, in the first embodiment, the diaphragm 15 is provided on two sides of the short side of
the rectangular shape of the diaphragm 15. However, if the diaphragm 15 can be supported, at
least a part of the outer peripheral portion of the diaphragm 15 is provided. It may be provided.
Furthermore, in the first embodiment, the edge portion 16 is provided on all the two short sides
of the rectangular short side of the vibrating membrane 15, but the edge portion 16 may be
provided at four corners of the rectangular short side of the vibrating membrane 15 You may
change the width of
[0017]
The structure of the edge part 16 is shown to (a)-(c) of FIG. FIG. 4A is a view showing the wave
shape of the edge portion 16. The left is formed by shaping the edge portion 16 into a wave
shape of one cycle, and the right is formed by shaping the edge portion 16 into a wave shape of
2 cycles. As the wave number of the edge portion 16 increases, the elasticity of the edge becomes
stronger. FIG. 4B is a view showing the difference in the width of the edge portion 16. On the left,
edges are formed on all the short sides of the vibrating membrane, and on the right, edges are
provided on both ends of the short sides. The larger the width of the edge portion 16, the greater
the elasticity. FIG. 4C is a view in which the support of the edge portion 16 is disposed at the
center position of the two short sides of the rectangle. Since the vibration displacement tends to
be larger in the long side direction, it may be disposed laterally to obtain stable support.
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[0018]
Next, the operation according to the configuration of the first embodiment will be described. In
this electromagnetic converter, when a current (audio signal) flows through the meandering coil
pattern 15b of the vibrating membrane 15, the meandering coil pattern 15b and the multipolar
magnetization pattern of the permanent magnets 11 and 12 are electromagnetically coupled to
cause the frame The vibrating membrane 15 is displaced according to the following rule to
generate vibration. This vibration vibrates the air in the frame 10 and is emitted as audio
vibration from the radiation sound holes 11 a and 12 a of the frame 10. At this time, the
vibrating film 15 is displaced along the direction orthogonal to the meandering coil pattern 15 b
due to the expansion and contraction of the wave shape of the edge portion 16. On the other
hand, since the expansion and contraction of the edge portion 16 has a limit, the displacement of
the vibrating film 15 is controlled and does not contact the upper and lower permanent magnets
11 and 12. That is, the vibrating film 15 is controlled by the edge portion 16 so as not to contact
the permanent magnets 11 and 12.
[0019]
According to the first embodiment described above, the electromagnetic converter 10 includes
the frame 20 and the upper and lower permanent magnets 11 and 12 bonded in multipolar
magnetization pattern arrangement to the upper and lower frames 21 and 22 of the frame 20.
And the spacers 13 and 14 held by the upper and lower frames 21 and 22 and the vibrating film
15 held by the spacers, and the vibrating film 15 is extended in the peripheral portion of the
vibrating film 15 to be corrugated. By providing the edge portion 16 to be formed and having
elasticity by making the rigid conductor into a wave shape, the vibrating membrane 15 can be
uniformly oscillated with a large amplitude. Further, since the vibrating film 15 and the edge
portion 16 are composed of the resin film 15a and the conductor portion of the meandering coil
pattern 15b, they are integrally formed by general press processing in which the substrate and
conductor are pressed with a male and female mold Since it can, it can shape | mold by a simple
manufacturing process. Further, since the edge portion 16 has a property as a spring because it
is a rigid wave shape, there is an effect that elasticity can be easily changed by changing the
shape and width of the edge portion 16 without changing the material. .
[0020]
In addition, although the edge cross-sectional shape was shown by the edge part 16 of a
waveform shape in FIG.3, 4, you may shape | mold into substantially semicircle shapes, such as
half roll shape other than wave shapes, such as sine wave shape and triangular wave shape, The
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same effect can be obtained by molding into any shape having elasticity.
[0021]
In the first embodiment, the upper and lower frames 21 and 22 and the upper and lower spacers
13 and 14 are shown as separate members, but by integrating the upper and lower frames 21
and 22 by integrating them in advance, Furthermore, the assembly process can be reduced.
[0022]
Furthermore, by forming the meandering coil pattern 15b of the edge portion 16 as a lead wire,
it can also be used as a feeding portion of the meandering coil pattern 15b.
[0023]
It is a disassembled perspective view which shows the structure of the electromagnetic converter
of Embodiment 1 of this invention.
It is sectional drawing which shows the positional relationship of the electromagnetic transducer
of Embodiment 1 of this invention, and the fixing method.
It is a figure which shows sectional drawing of the diaphragm in the electromagnetic transducer
of Embodiment 1 of this invention.
It is a figure which shows the shape of the edge in the electromagnetic transducer of
Embodiment 1 of this invention, and the kind of support method.
Explanation of sign
[0024]
DESCRIPTION OF SYMBOLS 10 electromagnetic converter, 11 upper side permanent magnet
(permanent magnet), 12 lower side permanent magnet (permanent magnet), 13 upper side
spacer (spacer), 14 lower side spacer (spacer), 15 vibrating membrane, 15a resin film, 15b
meandering shape A coil consisting of a conductor pattern (a meandering coil pattern), 16 edge
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portions (edge outer end portions), 20 frames, 21 upper frames (frames), 21a, 22a radiation
sound holes, 22 lower frames (frames).
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