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JP2007282039

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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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2007282039
An object of the present invention is to prevent vibrations from colliding with parts other than air
holes, effectively utilizing the range of the unmagnetized part nz, and reducing the area of the
magnetized part without reducing the area of the magnetized part. The purpose is to improve the
sound quality. A permanent magnet plate (2) and a frame (1) comprising permanent magnet
plates (2, 5) on which strip-like multipolar magnetization patterns are formed, and frames (1, 6)
covering and supporting the permanent magnet plates (2, 5). The shape of the air hole 8 is a slit
shape. As a result, it is possible to prevent vibration from colliding with a portion other than the
air hole 8, and it is possible to achieve an ideal sound pressure / sound quality improvement
without reducing the area of the magnetized portion. [Selected figure] Figure 1
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
permanent magnet and a vibrating membrane.
FIG. 4 is a schematic view of a conventional flat plate type electromagnetic converter. The
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electromagnetic converter of this type usually comprises permanent magnet plates 2 and 5, a
vibrating membrane 4 disposed to face the permanent magnet plates 2 and 5, and the permanent
magnet plates 2 and 5 and the vibrating membrane 4. The shock absorbing member 3 disposed
between and frame 1, 6 covering them. In addition, a coil 7 having a coil pattern 7 a is formed on
the entire surface of the vibrating film 4, and the frame 1 and the permanent magnet plate 2
have an air hole 10 of a circular shape. FIG. 2 is a cross-sectional view of a flat plate type
electromagnetic converter, and the electromagnetic converter comprises permanent magnet
plates 2 and 5 and a vibrating film 4 disposed so as to face the permanent magnet plates 2 and 5
The permanent magnet plates 2 and 5 have parallel stripe multipole magnetization patterns in
which strip-like N poles and S poles alternately appear. The permanent magnet plates 2 and 5
have a portion called a so-called unmagnetized portion (neutral zone of magnetization) nz of a
gap portion between different magnetic poles. Further, the vibrating film 4 forms a coil 7 at a
position facing the unmagnetized portion nz, and the frame 1 and the permanent magnet plate 2
have a circular air hole 10 as shown in FIG.
[0003]
In this electromagnetic converter, when current (audio signal) flows to the coil 7 of the
diaphragm 4, the coil 7 and the strip-like multipolar magnetization pattern of the permanent
magnet plates 2 and 5 are electromagnetically coupled, so vibration ( Audio vibration) is
generated in the diaphragm 4 according to Fleming's law. This vibration passes through the
circular air holes 10 (openings) of the frame 1 and the permanent magnet plate 2 and the sound
is output to the outside in the direction of the frame 1 and the permanent magnet plate 2.
[0004]
JP-A-9-331596 (paragraph 0013)
[0005]
The conventional electromagnetic transducer is configured as described above, and the vibration
generated from the vibrating film passes through the air hole and the sound is output to the
outside, so the shape of the air hole matches the shape of the unmagnetized portion nz Need to
be arranged.
However, although the shape of the circular air hole is often used as the air hole of the frame or
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permanent magnet plate in the conventional cone-shaped speaker, it can be arranged to match
the shape of the unmagnetized portion nz As a result, vibration collides with parts other than the
air holes. For this reason, the range (area) of the unmagnetized part nz was not able to be utilized
effectively, and the sound was hard to transmit outside. In addition, when the shape of the
circular air hole is made larger than the width of the non-magnetized portion nz in order to
prevent the vibration from colliding with the portion other than the air hole, the magnetized
portion of the permanent magnet plate is reduced. There is a problem that the magnetic force of
the plate is reduced, and as a result, the sound pressure is reduced.
[0006]
In order to solve the above problems, the present invention prevents vibration from colliding
with parts other than air holes, the range of unmagnetized part nz is effectively utilized, and the
permanent magnet plate has an area of the magnetized part. It aims to improve the ideal sound
pressure / sound quality without reducing it.
[0007]
An electromagnetic converter according to the present invention is an electromagnetic converter
including a permanent magnet plate on which a band-shaped multipolar magnetization pattern is
formed and a frame covering and supporting the permanent magnet plate, the permanent
magnet plate and the frame having a slit shape Have air holes.
[0008]
The electromagnetic transducer according to the present invention is an electromagnetic
transducer comprising a permanent magnet plate on which a band-shaped multipolar
magnetization pattern is formed, and a frame covering and supporting the permanent magnet
plate, comprising: air holes in the permanent magnet plate and the frame Since the shape is a slit
shape, vibration can be prevented from colliding with parts other than the air holes, the
permanent magnet plate having slit-like air holes can effectively utilize the range of the
unmagnetized part nz, and the permanent magnet plate The ideal sound pressure / sound quality
can be improved without reducing the area of the magnetized portion.
[0009]
Embodiment 1
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FIG. 1 is a schematic view of a flat plate type electromagnetic converter according to a first
embodiment of the present invention.
The electromagnetic transducer is disposed between the permanent magnet plates 2 and 5, the
vibrating membrane 4 disposed to face the permanent magnet plates 2 and 5, and between the
permanent magnet plates 2 and 5 and the vibrating membrane 4. The diaphragm 3 is provided
with frames 1 and 6 for covering and supporting them, and the vibrating membrane 4 forms a
coil 7 having a meandering coil pattern 7a on the entire surface.
Although this is the same as that of the conventional electromagnetic converter, the air holes 8 of
the frame 1 and the permanent magnet plate 2 have a slit shape unlike the conventional circular
shape. The figure which shows the cross-sectional view of the electromagnetic converter of
Embodiment 1 is FIG. 2 like the conventional electromagnetic converter, and the electromagnetic
converter comprises permanent magnet plates 2 and 5 and their permanent magnet plates 2 and
5. The permanent magnet plates 2 and 5 are provided with vibrating films 4 arranged to face
each other and frames 1 and 6 covering them. The permanent magnet plates 2 and 5 have a
portion called a so-called unmagnetized portion nz of the gap portion between different magnetic
poles. Further, the vibrating film 4 forms a coil 7 at a position facing the unmagnetized portion
nz, and the frame 1 and the permanent magnet plate 2 have air holes 8 of a slit shape as shown
in FIG.
[0010]
First, as shown in FIG. 2, in the permanent magnet plates 2 and 5, band-like multipolar
magnetization patterns N and S made of sintered ferrite magnets are formed on one side almost
on the entire surface facing the vibrating membrane 4 The multipole magnetization patterns N
and S are parallel stripe multipole magnetization patterns in which strip-like N and S poles
appear alternately as shown in FIG. 3 described later. The permanent magnet plate 2 is provided
with a plurality of slit-like air holes 8 having the same width as the unmagnetized portion nz at a
constant pitch a along the unmagnetized portion nz.
[0011]
Next, as shown in FIG. 1, the vibrating membrane 4 has a coil 7 having a meandering coil pattern
7a formed on the surface, and as shown in FIG. 2, the vibrating membrane 4 faces the permanent
magnet plates 2 and 5. It is arranged.
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The linear portion of the coil 7 is disposed at the center of the strip N and S poles of the
multipolar magnetization pattern, and the linear portion of the coil 7 is disposed in parallel at the
same pitch as the strip magnetic poles N and S. ing. The vibrating film 4 has a structure in which
a coil 7 having a meandering coil pattern 7a is printed on a flexible thin film resin film.
[0012]
The cushioning member 3 is formed of a non-woven fabric having air permeability and
permeability of acoustic energy, and as shown in FIG. 1, the cushioning member 3 is disposed
between the permanent magnet plates 2 and 5 and the vibrating membrane 4 and its vibration
While preventing the membrane 4 from colliding with the permanent magnet plates 2 and 5
during vibration, it plays a role as a suspension.
[0013]
The frame 1 has a slit-shaped air hole 8 communicated with the slit-shaped air hole 8 of the
permanent magnet plate 2.
The frame 6 is disposed on the surface of the permanent magnet plate 5 opposite to the surface
on which the multipolar magnetization pattern is formed to prevent magnetic flux leakage. For
the frames 1 and 6, for example, an iron plate or a nickel-iron alloy (permalloy) plate is applied.
[0014]
FIG. 3 is a schematic view for explaining the effect of the difference in shape of the air holes 8
and 10 of the electromagnetic converter. FIG. 3A is a view showing the arrangement of the slitshaped air holes 8 of the frame 1 and the permanent magnet plate 2, and the slit-shaped air
holes 8 are formed at intervals of the pitch a. 3 (a) is a diagram showing the magnetized pattern
9 of the permanent magnet plate 2, which is a parallel stripe multipole magnetized pattern in
which the N pole and the S pole appear alternately at the pitch a. An unmagnetized portion nz is
provided in the gap between different magnetic poles. FIG. 3A is a view in which the slit shape of
the air hole 8 is arranged to match the shape of the unmagnetized portion nz of the permanent
magnet plate 2. 3B is a view showing the arrangement of the circular shaped air holes 10 of the
frame 1 and the permanent magnet plate 2, and the conventional circular shaped air holes 10 are
formed at an interval of pitch a . The lower diagram in FIG. 3 (b) is the same as the lower diagram
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in FIG. 3 (a).
[0015]
In FIG. 3B, since the frame 1 and the permanent magnet plate 2 have the circular air holes 10
with respect to the straight unmagnetized portions nz, the shape of the unmagnetized portions nz
and the shape of the air holes 10 are illustrated. 3 (b) does not match as in the upper and lower
views, the vibration collides with parts other than the air hole 10, the range of the unmagnetized
part nz can not be used effectively, and the vibration is not sufficiently transmitted to the outside
. Further, when the diameter of the circular shape of the air hole 10 is made larger than the
width of the unmagnetized portion nz so that the range of the unmagnetized portion nz is
effectively utilized, the opening portions of the frame 1 and the permanent magnet plate 2 are
shown in FIG. As compared with a), the permanent magnet plate 2 has a narrow magnetizing area
and a reduced magnetic force. As a result, the sound pressure level to be output is reduced.
[0016]
On the other hand, in FIG. 3A, the frame 1 and the permanent magnet plate 2 have a plurality of
slit-like air holes 8 of the same width as the unmagnetized portion nz at a constant pitch a along
the unmagnetized portion nz. Therefore, the shape of the unmagnetized portion nz matches the
shape of the air hole 8, and the range of the unmagnetized portion nz can be effectively used.
Therefore, it is possible to prevent the vibration from colliding with the portion other than the air
hole 8, and it is possible to achieve an ideal sound pressure / sound quality improvement without
reducing the area of the magnetized portion of the permanent magnet plate 2.
[0017]
Further, since the frame 1 can expand the slit-like air holes 8 to within the strength tolerance
range, the frame 1 can effectively utilize the unmagnetized portion nz within the openable range.
This means that the permanent magnet plate 2 has a plurality of slit-like air holes 8 of the same
width as the unmagnetized portion nz at a constant pitch a along the unmagnetized portion nz,
and the frame 1 is unmagnetized. It is also possible to have a plurality of slit-like air holes 8
wider than the unmagnetized part nz at a constant pitch a along the part nz.
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[0018]
Next, the operation will be described. When a current flows through the coil 7 of the meandering
coil pattern 7a formed on the surface of the diaphragm 4, the coil 7 and the strip-like multipolar
magnetization pattern of the permanent magnet plates 2 and 5 are electromagnetically coupled.
Is generated on the vibrating membrane 4 according to Fleming's law. This vibration passes
through the air holes 8 of the frame 1 and the slits of the permanent magnet plate 2, and the
sound is output to the outside from the direction of the air holes 8 of the slit shape. The slit-like
air holes 8 are arranged at the same pitch a along the unmagnetized portions nz of the
permanent magnet plate 2 at a constant pitch a and the same width as the unmagnetized
portions nz, whereby the shape of the air holes 8 is unmagnetized Since the area of the
unmagnetized part nz can be effectively used because it matches the shape of the part nz, the
permanent magnet plate 2 can improve the ideal sound pressure / sound quality without
reducing the area of the magnetized part. Further, the permanent magnet plates 2 and 5, the
vibrating membrane 4 and the buffer member 3 described above are covered with the frames 1
and 6 and attached to the speaker housing.
[0019]
According to the first embodiment described above, the electromagnetic converter comprises:
permanent magnet plates 2 and 5 on which strip-shaped multipolar magnetization patterns are
formed; and frames 1 and 6 covering and supporting permanent magnet plates 2 and 5 , And
since the shape of the permanent magnet plate 2 and the slit-shaped air hole 8 of the frame 1
conforms to the shape of the unmagnetized portion nz of the permanent magnet plate 2, the
vibration collides with the portion other than the air hole 8. The permanent magnet plate 2 has
the effect that the ideal sound pressure / sound quality can be improved without reducing the
area of the magnetized portion, and the effect that the range of the unmagnetized portion nz can
be effectively utilized, the sound Produces an effect that it is easy to transmit outside.
[0020]
FIG. 1 is a schematic view of a flat plate type electromagnetic converter according to a first
embodiment.
It is a figure showing the cross section of a flat type electromagnetic transducer. It is a figure
which shows the effect by the difference in the shape of an air hole. FIG. 1 is a schematic view of
a conventional flat-plate electromagnetic converter configuration.
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Explanation of sign
[0021]
1 frame (upper part), 2 permanent magnet plate (upper part), 3 buffer member, 4 vibrating
membrane, 5 permanent magnet plate (lower part), 6 frame (lower part), 7 coil, 7a meandering
coil pattern, 8 slit shaped air hole , 9 magnetized patterns, 10 circular air holes, nz unmagnetized
portion (neutral zone of magnetization), a pitch.
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