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JP2007013794

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DESCRIPTION JP2007013794
PROBLEM TO BE SOLVED: To provide an electromagnetic converter capable of suppressing the
divided vibration of a diaphragm and a meandering coil pattern and reducing the generation of
sound pressure drop and distortion of an audio signal. SOLUTION: A lower permanent magnet
plate 11 on which a multipolar magnetization pattern is formed, a vibrating body 15 disposed
opposite to the lower permanent magnet plate 11 via a buffer member 13, and an opposing
arrangement placed on a vibrating body 15 via a buffer member 13. Frame 30 consisting of a
back frame 31 and a front frame covering the structure 20 in which the upper permanent
magnet plate 17 and the lower permanent magnet plate 11, the buffer member 13, the vibrating
body 15 and the upper permanent magnet plate 17 are stacked And an electromagnetic
converter 10 composed of The vibrating body 15 includes an insulating bonding reinforcement
15d that fills the uneven portion 15c formed by the vibrating membrane 15a, the serpentine coil
pattern 15b, and the vibrating membrane 15a and the serpentine coil pattern 15b. [Selected
figure] Figure 2
Electromagnetic converter
[0001]
The present invention relates to, for example, an electromagnetic converter that reproduces an
audio signal.
[0002]
Various techniques have been proposed for an electromagnetic transducer combining a
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permanent magnet and a vibrating membrane.
An electromagnetic transducer of this type usually comprises a permanent magnet plate, a
vibrating membrane disposed to face the permanent magnet plate, and a buffer member
disposed between the permanent magnet plate and the vibrating membrane. There is. The
permanent magnet plate is formed by alternately forming strip-like different magnetic poles at
regular intervals (hereinafter, this parallel stripe-shaped magnetization pattern is also referred to
as a multi-pole magnetization pattern). In addition, the vibrating film is disposed opposite to the
formation surface of the multipolar magnetization pattern, and is formed of a meander-shaped
conductor pattern at a position facing the so-called neutral zone of magnetization in the gap
between different magnetic poles. Coil (hereinafter, also referred to as a meandering coil pattern.
) Is formed on the entire surface. A plurality of sound radiation holes for emitting the generated
sound waves to the outside are formed at a constant pitch in the gap between the strip-like
different magnetic poles of the above-mentioned permanent magnet plate (see, for example,
Patent Document 1) .
[0003]
The structure in which the above-mentioned permanent magnet plate, vibrating membrane and
buffer member are stacked has, for example, a plate-like back frame laid under the abovementioned structure and a front frame covering the above and the above-mentioned structure
Covered in a frame that is made up of glued together. The electromagnetic converter configured
as described above is attached to a housing for an audio device such as a speaker, for example,
and used as an audio device that reproduces an audio signal.
[0004]
JP-A-9-331596
[0005]
The vibrating membrane of the conventional electromagnetic transducer and the meandering coil
pattern are collectively referred to as a vibrating body here, and the operation thereof will be
briefly described.
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The current (audio signal) flows through the meandering coil pattern provided on the vibrating
membrane, whereby the meandering coil pattern and the multipolar magnetization pattern of the
permanent magnet plate are electromagnetically coupled, and according to Fleming's left-hand
rule The vibrating film vibrates in the thickness direction to generate a sound wave. At this time,
when the frequency of the current flowing through the meandering coil pattern is low, the
vibrating membrane is thin and flexible, so that the vibrating body is integrated and vibrates in
the same direction. The low frequency band here means 200 Hz or less. However, as the
frequency of the current flowing through the meandering coil pattern increases, and even when
the frequency is low, if the amplitude is large, a deviation occurs in the vibration direction
between the meandering coil pattern and the vibrating membrane, and the vibrating membrane
vibrates in the vibrating direction. On the other hand, the serpentine coil pattern receives forces
in opposite directions, and the diaphragm and the serpentine coil pattern vibrate in opposite
directions (hereinafter, also referred to as divided vibration). The occurrence of divided vibration
in this way causes the phase difference of the generated sound wave, the disturbance of the
waveform, and the deterioration of the directivity characteristics, and causes a problem such as a
decrease in sound pressure of the generated audio signal and generation of distortion. .
[0006]
The present invention has been made to solve the above-described problems, and by improving
the strength of the vibrating body, the divided vibration of the diaphragm and the serpentine coil
pattern is suppressed, and the sound pressure drop and distortion of the audio signal are
reduced. It is an object of the present invention to provide an electromagnetic converter capable
of reducing the occurrence of
[0007]
The electromagnetic converter according to the present invention comprises a permanent
magnet plate in which strip-like different magnetic poles are alternately formed at a constant
interval, and a gap portion of the permanent magnet plates arranged opposite to the permanent
magnet plate. In an electromagnetic transducer provided with a vibrating film having a coil
formed of a meander-shaped conductor pattern formed on the entire surface at opposing
positions, the uneven portion formed by the coil and the vibrating film formed of a meandershaped conductor pattern is filled. Insulating bond reinforcement is provided.
[0008]
According to the present invention, since the electromagnetic converter is configured by
including the insulating coupling reinforcing material filling the uneven portion formed by the
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vibrating membrane and the meandering coil pattern, the strength of the entire vibrating body is
improved, and the vibration is improved. It is possible to suppress the divided vibration of the
membrane and the serpentine coil pattern.
For this reason, there is an effect that it is possible to obtain an electromagnetic converter
capable of reducing the occurrence of sound pressure drop and distortion of an audio signal.
[0009]
Hereinafter, various embodiments of the present invention will be described.
Embodiment 1 FIG. 1 is an exploded perspective view for describing a configuration of an
electromagnetic converter 10 according to a first embodiment of the present invention. FIG. 2 is
a cross-sectional view showing an example of the configuration of the insulating joint
reinforcement in the vibrator of the electromagnetic converter 10. As shown in FIG. FIG. 3 is a
schematic explanatory view for explaining the operation of the vibrator, and shows the operation
of the vibrator in the case where the insulating joint reinforcement is not provided. The arrows in
the figure indicate the vibrating direction of the coil composed of the vibrating membrane and
the conductor pattern of the serpentine shape. The cross-sectional views of FIG. 2 and FIG. 3 are
both a plan view of the vibrator in which the coil of the meander-shaped conductor pattern in
FIG. 3A is simplified and shown by arrows along line X-X. It is shown in correspondence with the
view when viewed in the direction. Note that hatching indicating a cross section is partially
omitted. Here, an electromagnetic transducer is configured such that one diaphragm is
sandwiched by two permanent magnet plates from above and below via a buffer member. Also,
here, a permanent magnet plate in which a sound radiation hole for radiating a sound wave to
the outside is formed is referred to as an upper permanent magnet plate, and a lower permanent
magnet plate is opposed to the upper permanent magnet plate via a vibrating film. It was called a
side permanent magnet plate. Furthermore, a vibration film, a coil having a meander-shaped
conductor pattern, which is a structure involved in vibration, and an insulating bonding
reinforcement are collectively referred to as a vibrating body.
[0010]
In the figure, the electromagnetic converter 10 is configured as follows. In the lower permanent
magnet plate 11, strip-like different magnetic poles (N pole, S pole) made of sintered ferrite
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magnets are alternately formed at a predetermined interval on substantially the entire surface
opposite to a vibrating film 15a described later. (Hereinafter, this parallel stripe-shaped
magnetization pattern is also referred to as a multipolar magnetization pattern.) In a gap between
different magnetic poles (N and S poles), a neutral zone of magnetization (not shown) is present.
[0011]
A vibrating body 15 is disposed on the upper side of the lower permanent magnet plate 11 at a
position opposite to the surface on which the multipolar magnetization pattern is formed, with a
buffer member 13 interposed. The vibrating body 15 is also referred to as a meandering coil
pattern, which is a vibrating film 15a made of a thin and flexible resin film, and a meandering
conductor pattern formed on the entire surface of the vibrating film 15a. And 15 b, and an
insulating joint reinforcing material 15 d which fills the uneven portion 15 c formed by the
vibrating film 15 a and the meandering coil pattern 15 b. Each of the linear portions in the
longitudinal direction of the meandering coil pattern 15b is provided at a position corresponding
to the neutral zone of the gap portion between different magnetic poles (N pole, S pole) of the
lower permanent magnet plate 11 . The straight portions refer to long straight portions of the
meandering coil pattern 15b, which are disposed in parallel to each other with a constant
distance. Although various materials can be considered as the insulating bond reinforcement
15d, it is considered that a material having high inelasticity and high internal loss is desirable
because it is a portion to which Joule heat generated from the meandering coil pattern 15b is
directly transmitted. Be Here, polyester was used. Polyester is a material having excellent heat
resistance, cold resistance, and other environmental resistance and little change with time, and
thus is suitable as an insulating bonding reinforcement.
[0012]
Next, an example of a method of forming the insulating bonding reinforcement 15d will be
described. For example, after the polyester is vaporized and vaporized by energy such as heat or
plasma, the insulating bonding reinforcing material 15d is formed by thinning the uneven
portion 15c to be formed (vapor deposition method). Also, a method of forming the insulating
bonding reinforcement 15d by cutting it into a shape according to the concavo-convex portion
15c to be formed and bonding it to the vibrating film 15a of the concavo-convex portion 15c
described above using a double-sided tape. But it is good.
[0013]
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The insulating bond reinforcement 15d formed as described above is configured as shown below,
for example, according to the desired characteristics. FIG. 2 (a) is an example in which the
thickness of the insulating bonding reinforcement 15d is matched to the meandering coil pattern
15b, and the upper portions of the insulating bonding reinforcement 15d and the meandering
coil pattern 15b are even and flat. It has become. FIG. 2B is an example in which the thickness of
the insulating bonding reinforcement 15d is increased with respect to the meandering coil
pattern 15b. FIG. 2C shows an example in which the thickness of the insulating bonding
reinforcement 15d is thinner than that of the meandering coil pattern 15b. In FIG. 2D, the
thickness of the insulating bonding reinforcement 15d in a part of the uneven portion 15c (here,
the central portion) is increased, and the insulating bonding reinforcement 15d filling the other
uneven portion 15c is meandering. It is formed thinner than the coil pattern 15b. Further, in the
outermost uneven portion 15c, the thickness of the insulating bonding reinforcement 15d is
thinner toward the edge of the vibrating film 15a. In FIG. 2 (e), as in FIG. 2 (b), the thickness of
the insulating bonding reinforcement 15d is increased with respect to the meandering coil
pattern 15b, but the bonding bonding reinforcement on the meandering coil pattern 15b is also
insulating. The surface is covered with the material 15d and the surface of the insulating bonding
reinforcement 15d is flat.
[0014]
Thus, the insulating bond reinforcement 15d can be formed to any thickness. Moreover, it is also
possible to combine and form the insulating joint reinforcement 15d which has a different
thickness in one vibration body 15. Since the size of the entire vibrating body 15, the spacing of
the serpentine coil patterns 15b, the impedance setting, and the like differ depending on the
specifications of manufacturing the electromagnetic converter, the generation patterns of the
divided vibrations of the vibrating body described above also differ depending on those
conditions. Therefore, as shown in (a) to (e) of FIG. 2, the shape, thickness, and the like of the
insulating bonding reinforcement 15d are adjusted and formed by a suitable method, and desired
characteristics are obtained.
[0015]
An upper permanent magnet plate 17 is disposed on the upper side of the vibrating body 15, and
a band-shaped multipolar magnetized pattern made of sintered ferrite magnet is formed on
almost the entire surface facing the vibrating body 15 with the buffer member 13 interposed
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therebetween. It is done. The upper permanent magnet plate 17 is provided with sound radiation
holes 17a at a constant pitch along the neutral zone of the gap between the magnetic poles (N
pole, S pole) having different multipolar magnetization patterns.
[0016]
The plate-like back frame 31 on which the structure 20 is mounted under the structure 20 on
which the lower permanent magnet plate 11, the buffer member 13, the vibrating body 15, and
the upper permanent magnet plate 17 are stacked, The frame 30 is configured by bonding the
front frame 33 covering the upper side and the periphery of the structure 20. Sound emission
holes 33a are provided corresponding to the positions of the front frame 33 of the frame 30
covering the upper side of the structural body 20 where the sound emission holes 17a are
formed.
[0017]
Next, the operation will be described. When a signal is input from an input terminal (not shown)
and a current as an audio signal flows through the meandering coil pattern 15b formed on the
surface of the vibrating membrane 15a, the meandering coil pattern 15b and the lower side
disposed opposite to the meandering coil pattern 15b. And the multipolar magnetization pattern
in the upper permanent magnet plates 11 and 17 is electromagnetically coupled, and the
vibrating membrane 15a (the vibrating body 15) vibrates in the thickness direction according to
Fleming's left-hand rule. At this time, when the vibrating body is constituted only by the vibrating
film 15a and the meandering coil pattern 15b as in the prior art (FIG. 3 (b)), the frequency of the
current flowing through the meandering coil pattern 15b increases. If the amplitude is large even
if is low, split vibration as shown in FIG. 3 (c) occurs. However, since the vibrating body 15 in the
electromagnetic converter 10 according to the first embodiment includes the insulating bonding
reinforcement 15d which fills the uneven portion 15c formed by the vibrating membrane 15a
and the meandering coil pattern 15b, The strength of the entire vibrating body 15 is improved,
and even when the current flowing through the meandering coil pattern 15b is a high frequency
or the amplitude is large, the divided vibration can be suppressed, and the vibrating film 15a and
the meandering coil pattern 15b Vibrate in the same direction. Sound waves generated by such
vibrations are radiated into the air through the sound radiation holes 15a and 33a.
[0018]
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As described above, according to the electromagnetic converter 10 of the first embodiment of the
present invention, the insulating coupling reinforcing material 15d is provided to fill the uneven
portion 15c formed by the vibrating membrane 15a and the meandering coil pattern 15b. As a
result, the strength of the entire vibrating body 15 is improved, so that the divided vibration of
the vibrating body 15 can be suppressed. Therefore, it is possible to obtain an electromagnetic
converter capable of reducing the occurrence of sound pressure drop and distortion of an audio
signal.
[0019]
In the electromagnetic converter 10 of Embodiment 1, although the example which used
polyester as the insulating joint reinforcement 15d was shown, you may use another suitable
insulating material. For example, even when polyimide is used instead of polyester, the same
effect as in Embodiment 1 can be obtained. In addition, as long as it is a suitable one that satisfies
the function as the insulating bonding reinforcement 15d and exhibits the same effect, it is not
limited to these materials.
[0020]
FIG. 1 is an exploded perspective view showing a configuration of an electromagnetic converter
of a first embodiment. FIG. 7 is a cross-sectional view showing an example of the configuration of
the insulating joint reinforcement in the vibrator of the electromagnetic converter according to
the first embodiment. It is a figure for demonstrating the operation | movement of the vibrating
body of an electromagnetic converter.
Explanation of sign
[0021]
DESCRIPTION OF SYMBOLS 10 electromagnetic converter, 11 lower permanent magnet board,
13 buffer members, 15 vibrators, 15a vibrating film, 15b coil formed of a conductor pattern of
15b meander shape, 15c uneven part, 15d insulating joint reinforcement, 17 upper permanent
magnet Board, 17a sound radiation hole, 20 structure, 30 frame, 31 back frame, 33 front frame,
33a sound radiation hole.
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