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JP2009232080

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Notice
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 JP2009232080
An electromagnetic transducer capable of generating a magnetic flux also at a folded portion of a
serpentine coil pattern of a diaphragm. In a meandering coil pattern 4a formed on the surface,
permanent magnets 2 and 3 alternately magnetized in parallel at predetermined intervals, and a
magnetizing surface of the permanent magnets 2 and 3 are disposed opposite to each other In an
electromagnetic transducer 1 provided with a vibrating film 4 electromagnetically coupled to
permanent magnets 2 and 3 when a current flows and vibrating in a thickness direction, and a
frame 5 covering and supporting permanent magnets 2 and 3 and vibrating film 4 The
permanent magnets 2 and 3 have a plurality of first permanent magnets 2a and 3a extending in
the longitudinal direction of the vibrating membrane 4 and the first permanent magnets 2a and
3a at both ends of the first permanent magnets 2a and 3a. And a plurality of vertically extending
second permanent magnets 2b and 3b. [Selected figure] Figure 1
Electromagnetic converter
[0001]
The present invention relates to an electromagnetic transducer provided with a coil pattern on
the surface of a diaphragm to reproduce an audio signal.
[0002]
Various techniques have been proposed for electromagnetic transducers in which permanent
magnets and vibrating membranes are combined.
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1
For example, the electromagnetic converter disclosed in Patent Document 1 includes 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. In the permanent magnet plate, strip-like different magnetic poles are alternately
formed at regular intervals. In the vibrating film, a coil made of a meander-shaped conductor
pattern is formed on the entire surface at a position opposite to a portion called a so-called
neutral zone of magnetization in the gap between different magnetic poles of permanent magnet
plates. Thus, when current (audio signal) flows through 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. The
permanent magnet plate, the diaphragm and the buffer member are covered by a frame and
attached to the speaker housing.
[0003]
JP-A-9-331596
[0004]
Since the conventional electromagnetic converter is configured as described above, the folded
portion of the serpentine coil pattern of the diaphragm is a structure that does not receive
magnetic flux, and does not generate a driving force and becomes a useless portion that
increases the mass, There was a problem that it became an obstacle to sound pressure
improvement.
In addition, stripe magnetization, which is a magnetization method of alternately forming striplike different magnetic poles at regular intervals, has a problem that the price is high because it
is a magnetization yoke in which N and S poles are alternately arranged. The
[0005]
The present invention has been made to solve the above-described problems, and a magnetic
circuit structure capable of generating a magnetic flux also at the folded portion of the
meandering coil pattern of the vibrating film and bringing the vibrating film closer to drive on
the entire surface. It aims at obtaining an electromagnetic converter which it has. Furthermore, it
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2
is an object of the present invention to simplify the magnetizing yoke with one polarity and to
keep the price low.
[0006]
In the electromagnetic converter according to the present invention, a permanent magnet having
a polarity alternately magnetized in parallel at predetermined intervals, and a coil pattern which
is disposed to face the magnetization formation surface of the permanent magnet and which has
a coil pattern formed on the surface An electromagnetic transducer comprising: a vibrating film
electromagnetically coupled to the permanent magnet when it flows and vibrating in a thickness
direction; and a frame covering and supporting the permanent magnet and the vibrating film,
wherein the permanent magnet is the vibrating film A plurality of first permanent magnets
extending in the longitudinal direction, and a plurality of second permanent magnets extending
perpendicularly to the first permanent magnet at both ends of the first permanent magnet .
[0007]
According to the present invention, the permanent magnet includes the plurality of first
permanent magnets extending in the longitudinal direction of the vibrating membrane, and the
plurality of second permanent magnets extending in the direction perpendicular to the first
permanent magnet at both ends of the first permanent magnet. Since the permanent magnet of
the present invention is provided, it is possible to generate a driving force also at the folded
portion of the coil pattern of the vibrating film, and a long effective length of the coil pattern can
be secured.
As a result, the sound pressure can be improved and the vibrating film can be brought close to
full drive. In addition, since a magnetic circuit is configured by combining strip-like permanent
magnets, the magnetizing yoke is simple, and the cost can be reduced.
[0008]
Embodiment 1 1 is an exploded perspective view showing the configuration of an
electromagnetic converter according to Embodiment 1 of the present invention, FIG. 2 is a
sectional view taken along the line A-A of the electromagnetic converter of FIG. 1, and FIG. It is a
BB sectional view taken on the line of a converter. The electromagnetic transducer 1 is
configured to sandwich one vibrating membrane 4 with permanent magnets 2 and 3 with a gap
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3
from above and below. Further, the permanent magnets 2 and 3 are magnetic circuits in which
magnets of different poles such as N pole and S pole are alternately disposed at a predetermined
interval so as to sandwich a coil pattern described later on the opposing surface to the vibrating
film 4. Form a structure. The permanent magnets 2 and 3 have different magnetic poles on the
front and back sides, but in FIG. 2 and FIG. 3, the magnetic poles on the surface are shown for
convenience.
[0009]
In the vibrating membrane 4, a coil (hereinafter, referred to as a meandering coil pattern) 4a
formed of a meandering conductive wire pattern is printed on a thin and flexible film 4b. Each of
the linear portions of the meandering coil pattern 4a is provided at a position corresponding to a
neutral zone which is substantially at an intermediate position between the N poles and the S
poles of the permanent magnets 2 and 3. Here, the linear portion refers to linear portions of the
meandering coil pattern 4a which are disposed in parallel with each other with a predetermined
distance.
[0010]
A frame 5 is configured by the upper frame 6 on which the permanent magnet 2 is mounted and
the lower frame 7 on which the permanent magnet 3 is mounted. Radiation sound holes 6a and
7a are formed in the upper frame 6 and the lower frame 7 on the surface of the diaphragm 4
with respect to the meandering coil pattern 4a.
[0011]
Next, the details of the permanent magnet will be described. FIG. 4 is a diagram showing a
configuration of a permanent magnet of the electromagnetic converter according to Embodiment
1 of the present invention. In addition, although demonstrated using the permanent magnet 2 in
FIG. 4, the permanent magnet 3 also has the same structure. The permanent magnet 2 extends in
a direction perpendicular to a plurality of strip-like permanent magnets (first permanent
magnets) 2a extending in the longitudinal direction of the rectangular vibrating film 4 and the
lateral direction of the vibrating film 4, that is, the permanent magnet 2a. A plurality of strip-like
permanent magnets (second permanent magnets) 2 b are formed. The permanent magnets 2a
alternately arrange N poles and S poles at predetermined intervals. Further, on the left side of the
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4
permanent magnet 2a, an N pole permanent magnet 2b is disposed at a distance, and at a right
side, an S pole and an N pole permanent magnet 2b are disposed. As described above, since the
permanent magnet 2b extending in the vertical direction with respect to the permanent magnet
2a is disposed, a magnetic circuit structure capable of generating a magnetic flux also in the
folded portion of the meandering coil pattern 4a of the diaphragm 4 is formed. doing.
[0012]
Next, the operation of the electromagnetic converter 1 will be described. The vibrating film 4 is
disposed so as to face the magnetic circuit formation surface of the permanent magnets 2 and 3.
Therefore, when a current as an audio signal flows through the coil pattern 4a formed on the
surface, the coil pattern 4a and the permanent magnet 2 are formed. And 3 are
electromagnetically coupled, and audio vibration is generated in the vibrating film 4 according to
Fleming's law. Sound waves generated by the audio vibration are emitted to the outside through
the radiation sound holes 6a and 7a, and audio reproduction is performed.
[0013]
Next, the driving force generation state of the permanent magnet 2 and the vibrating membrane
4 will be described. The permanent magnet 2a extending in the longitudinal direction of the
vibrating membrane 4 and the permanent magnet 2b extending in the vertical direction with
respect to the permanent magnet 2a are disposed at both ends of the permanent magnet 2a. The
meandering coil pattern 4a and the magnetic circuit of the permanent magnet 2 are
electromagnetically coupled to generate a magnetic flux to obtain a driving force. Thereby, the
vibration film 4 can be brought close to full drive. Further, since the magnetic flux can be
generated also in the folded portion of the meandering coil pattern 4a to obtain the driving force,
the useless portion is eliminated from the meandering coil pattern 4a, the effective length can be
secured long, and the sound pressure is improved. be able to. The same applies to the permanent
magnet 3 and the vibrating membrane 4.
[0014]
FIG. 5 is a diagram showing another configuration of the permanent magnet of the
electromagnetic converter in accordance with the first embodiment of the present invention. FIG.
5 (a) shows two N-pole permanent magnets 2a extending in the longitudinal direction of the
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vibrating film 4 located at the outermost periphery of the magnetic circuit and the short direction
of the vibrating film 4 located on the left side of the permanent magnet 2a. Are arranged so as to
form a U shape by connecting them to a single permanent magnet 2b of N poles extending in the
direction. FIG. 5 (b) shows the two N-pole permanent magnets 2a extending in the longitudinal
direction of the vibrating film 4 located at the outermost periphery of the magnetic circuit and
the shorts of the vibrating film 4 located on the left and right sides of the permanent magnet 2a.
The two permanent magnets 2b extending in the hand direction are connected with each other to
form a rectangular shape, and other permanent magnets 2a and 2b alternately arranged in
polarity are configured to be surrounded from four directions.
[0015]
In FIG. 5C, permanent magnets having the same polarity are connected in a comb shape, and
comb-shaped portions extending in the longitudinal direction of the vibrating membrane 4 are
meshed so that the N pole and the S pole are alternately located. It is configured as follows. In
FIG. 5 (d), permanent magnets 2a and 2b located at the outermost periphery of FIG. 5 (c) are
connected to form a square shape, and other permanent magnets 2a and 2b alternately arranged
in polarity are surrounded from four directions. It is composed of
[0016]
As described above, according to the first embodiment, the permanent magnet 2a extending in
the longitudinal direction of the diaphragm and the permanent magnet 2b extending in the
vertical direction with respect to the permanent magnet 2a are disposed at both ends of the
permanent magnet 2a. With such a configuration, the magnetic flux can be generated also at the
folded portion of the meandering coil pattern to obtain the driving force, and the vibrating film
can be brought closer to the entire surface driving. Further, the effective length of the
meandering coil pattern can be secured long, and the sound pressure can be improved and the
vibrating film can be brought close to full drive.
[0017]
Further, according to the first embodiment, since magnetization is performed by the
magnetization yoke configured with one polarity at the time of magnetization, it becomes a
simple magnetization yoke, and the cost can be suppressed.
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[0018]
It is a disassembled perspective view which shows the structure of the electromagnetic converter
which concerns on Embodiment 1 of this invention.
It is the sectional view on the AA line in FIG. It is the BB sectional drawing in FIG. It is a figure
which shows the structure of the permanent magnet of the electromagnetic converter concerning
Embodiment 1 of this invention. It is a figure which shows the other structure of the permanent
magnet of the electromagnetic converter concerning Embodiment 1 of this invention.
Explanation of sign
[0019]
1 electromagnetic transducer, 2, 2a, 2b, 3, 3a, 3b permanent magnet, 4 vibrating membrane, 4a
meandering coil pattern, 4b film, 5 frame, 6 upper frame, 7 lower frame, 6a, 7a radiation sound
hole.
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