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JP2008199116

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2008199116
An electromagnetic transducer for easily connecting a coil pattern of a vibrating film to a
connection terminal provided on a frame without forming a notch in a permanent magnet plate
and suppressing generation of a large stress at a connection portion Get SOLUTION: A permanent
magnet plate 2 or 6 having a magnetized pattern on its surface, a vibrating film 4 having a
meandering coil pattern 16 on the film surface opposed to the magnetized pattern of the
permanent magnet plate 2 or 6, and a permanent magnet The lower frame 1 which covers the
buffer members 3, 5 disposed in the gap between the plates 2, 6 and the vibrating membrane 4,
the permanent magnet plates 2, 6, the buffer members 3, 5, and the vibrating membrane 4 And
an upper frame 7 and a terminal plate 12 disposed on the lower frame 1 for external connection,
and the vibrating membrane 4 has an end of a serpentine coil pattern 16 and extends
horizontally from the edge of the membrane surface An electrode 17 connected to the
connection terminal 11 provided on the terminal plate 12 is provided. [Selected figure] Figure 1
Electromagnetic converter
[0001]
The present invention relates to an electromagnetic transducer that vibrates a diaphragm to
reproduce sound of an audio signal or the like.
[0002]
In the electromagnetic converter, a flat permanent magnet plate having a parallel stripe
multipolar magnetization pattern in which strip-like N and S poles appear alternately is opposed
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to a diaphragm in which a coil pattern is formed on a resin film. And a buffer member or the like.
When the current of the audio signal flows through the coil pattern of the diaphragm, the coil
pattern and the multipolar magnetization pattern of the permanent magnet plate are
electromagnetically coupled, and audio vibration occurs in the diaphragm according to the law of
Fleming (for example, , Patent Document 1). Such an electromagnetic converter performs wiring
connection between the coil pattern provided on the vibrating film and the outside of the
electromagnetic converter using, for example, a connection terminal provided on a frame.
[0003]
FIG. 4 is an explanatory view showing a configuration of a conventional electromagnetic
converter. This figure is an exploded perspective view showing a configuration example of a
conventional electromagnetic converter. In this electromagnetic converter, the permanent
magnet plate 52 is mounted on the lower frame 51, the buffer member 53 is mounted on the
permanent magnet plate 52, the vibrating film 54 is mounted on the buffer member 53, and The
buffer member 55 is mounted, the permanent magnet plate 56 is mounted on the upper frame
57, and the lower frame 51 and the upper frame 57 are joined so as to mount the permanent
magnet plate 56 from above the buffer member 55 ing. Further, in the illustrated embodiment,
two terminal connection holes 62 penetrating the plate surface of the lower frame 51 are
provided in the vicinity of the edge of the lower frame 51.
[0004]
The lower frame 51 and the upper frame 57 are formed to have a clearance of several
millimeters with respect to the peripheral portions of the permanent magnet plates 52 and 56. In
order to connect the end portion of the coil pattern 64 provided with itself to the connection
terminal 60, the vibrating membrane 54 inserts a substantially T-shaped cut in the edge portion
of the vibrating membrane 54 and bends the cut portion so as to widen it. Two tongues project
below the vibrating membrane 54. The end portion of the coil pattern 64 is disposed on the
tongue-shaped piece, and this portion is provided as the electrode 63 of the diaphragm 54.
Further, in order to project the electrode 63 downward of the vibrating membrane 54 and
connect it to the connection terminal 60 in this manner, a permanent disposed between the
lower frame 51 provided with the connecting terminal 60 and the vibrating membrane 54 as
described later. The magnet plate 52 is provided with a notch 65 so as not to interrupt the space
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between the electrode 63 and the connection terminal 60, and the buffer member 53 is provided
with a notch 66.
[0005]
FIG. 5 is a cross-sectional view of a conventional electromagnetic transducer. This figure shows a
longitudinal cross-section of the part of the B-B 'line shown in FIG. 4. The same reference
numerals are used for the same parts as shown in FIG. As described above, the permanent
magnet plate 52 is placed on the lower frame 51, and the buffer member 53 and the vibrating
film 54 are placed. A terminal plate 61 is attached to the terminal connection hole 62 provided in
the lower frame 51 from the lower side of the lower frame 51. In this mounting, the protruding
portion of the connection terminal 60 fixed to the terminal plate 61 is inserted into the terminal
connection hole 62 and exposed on the surface of the lower frame 51. The electrode 63 of the
vibrating film 54 protruding downward as described above is fixed to the exposed portion by the
solder 70, and the coil pattern 64 and the connection terminal 60 are connected so as to be
conductive.
[0006]
JP-A-9-331596 (pages 3-5, FIGS. 1 and 2)
[0007]
Since the conventional electromagnetic transducer is configured as described above, a notch is
provided in a part of the permanent magnet plate disposed between the vibrating membrane and
the connection terminal, and the notch portion is vibrated through the electrode of the vibrating
membrane. The coil pattern of the membrane was connected to the connection terminal.
Alternatively, the external connection cable is directly connected to the end of the coil pattern.
Therefore, it is necessary to secure a wiring space inside the electromagnetic converter, and
there is a problem that the workability of assembly is significantly deteriorated and the defect
occurrence rate is also high. Further, as described above, when a part of the permanent magnet
plate is cut out, the vibrating film can not be vibrated efficiently, and there is a problem that the
generated sound pressure is reduced. In addition, since the cut portion provided in the vibrating
membrane is bent approximately 90 degrees to form an electrode, and the electrode is connected
and fixed to the connection terminal, stress occurs in the above-mentioned bent portion to
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adversely affect vibration, and connection There is a problem that a problem occurs in the fixed
part.
[0008]
The present invention has been made to solve the above-described problems, and it is possible to
prevent generation of a large stress in a connection portion without providing a notch in a
permanent magnet plate, and to prevent generation of a large stress in a connection portion. It is
an object of the present invention to obtain an electromagnetic converter which easily connects
with a connection terminal provided in
[0009]
In the electromagnetic transducer according to the present invention, the vibrating film has the
end of the coil pattern and is horizontally extended from the film surface edge, and the end of the
coil pattern is connected to the connection terminal provided on the terminal plate It has a
connection.
[0010]
According to the present invention, the vibrating membrane is provided with the connecting
portion which has the end of the coil pattern and extends horizontally from the film surface edge
and connects the end of the coil pattern to the connection terminal provided on the terminal
plate. Thus, the connection workability between the diaphragm and the connection terminal can
be improved.
[0011]
Hereinafter, an embodiment of the present invention will be described.
Embodiment 1
FIG. 1 is an explanatory view showing a configuration of an electromagnetic converter according
to Embodiment 1 of the present invention.
This figure is an exploded perspective view of the electromagnetic converter according to the
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first embodiment, and when the lower frame 1 and the upper frame 7 and the lower frame 1 and
the upper frame 7 are joined, a permanent magnet covered and supported by these The
arrangement configuration of the plates 2 and 6, the buffer members 3 and 5, and the vibrating
membrane 4 is shown. The lower frame 1 and the upper frame 7 are formed of a ferromagnetic
material, for example, an iron plate formed by sheet metal processing so that when the flat lower
frame 1 is joined to the upper frame 7, it becomes a box-shaped frame having a substantially
rectangular parallelepiped shape. The top and bottom of the frame are formed to be rectangular.
The permanent magnet plate 2 is attached to the lower frame 1 by its own magnetic force. A
buffer member 3 is superimposed on the permanent magnet plate 2 in the upper part in the
drawing, and a vibrating film 4 is superimposed on the buffer member 3. A buffer member 5 is
stacked above the vibrating membrane 4, and a permanent magnet plate 6 is stacked above it.
The permanent magnet plate 6 is mounted on the inner upper surface of the box-like upper
frame 7 by its own magnetic force.
[0012]
The lower frame 1 is formed in a flat plate shape, and includes a terminal plate 12 having a
connection terminal 11 in the vicinity of, for example, a short side of a quadrilateral plate shape.
Two connection terminals 11 are provided to be connected to electrodes 17 described later, and
fixed to a terminal plate 12 made of an insulating material. The terminal plate 12 is mounted on
the upper surface of the lower frame 1, that is, on the inner surface of the lower frame 1 which is
the inner side when the lower frame 1 and the upper frame 7 are joined, and the tip portion of
the connection terminal 11 is the lower frame It is installed so as to protrude outward from the
edge of 1. The connection terminal 11 is coated with an insulating resist coating on at least a
possible contact portion so as not to contact the lower frame 1 and the upper frame 7 to cause a
short circuit.
[0013]
Further, the permanent magnet plate 2 is attached to the rear of the terminal plate 12 installed at
the edge of the lower frame 1 as described above. That is, the lower frame 1 is configured so that
the terminal plate 12 and the permanent magnet plate 2 can be disposed on the same plane. The
upper frame 7 is also joined to the lower frame 1 so as to cover each component such as the
diaphragm 4 including the terminal plate 12 attached to the lower frame 1. Thus, the dimensions
of the plate surface of the lower frame 1 and the upper surface of the upper frame 7 are the film
surface of the vibrating film 4, the plate surfaces of the permanent magnet plates 2 and 6
laminated with the vibrating film 4, and the buffer It is configured to be larger than the
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dimensions of the upper and lower surfaces and the like of the members 3 and 5. The plate
surfaces of the permanent magnet plates 2 and 6 described here, the upper and lower surfaces of
the buffer members 3 and 5, and the film surfaces of the vibrating film 4 correspond to the
shapes of the lower frame 1 and the upper frame 7, for example It is formed in a rectangle.
[0014]
The vibrating film 4 has a conductor pattern on a resin film 15 such as polyimide as a general
flexible substrate. This conductor pattern is formed by meandering one pattern line over
substantially the entire surface of the resin film 15, and forms, for example, a meander pattern in
which a long linear portion is provided in the longitudinal direction of the vibrating film 4
forming a rectangle. It is configured to act as an electromagnetic coil. Hereinafter, this conductor
pattern is described as a meandering coil pattern 16. The vibrating film 4 also includes two
electrodes 17 each having an end of the meandering coil pattern 16 as a connection with the
terminal plate 12.
[0015]
The electrode 17 is provided flush with the film surface of the vibrating film 4 and, for example,
is configured as a tongue piece of the quadrilateral vibrating film 4 as shown in FIG. It is
integrally formed with the surface and extends horizontally from the edge of the film surface. As
described above, the electrodes 17 serving as each end of the meandering coil pattern 16 are
disposed, for example, at substantially both short sides of one of the edges of the vibrating
membrane 4, and the long sides of the edge of the vibrating membrane 4 are It projects in the
extending direction. The positions at which the electrodes 17 are provided are preferably four
corners of the film surface having the meandering coil pattern 16 in order to suppress the
influence on the vibration of the vibrating film 4 and the width of the tongue shape is also set so
as not to affect the vibration. Also, the amount of protrusion from the above-mentioned edge is
appropriate so that the electrode 17 can be respectively connected to the two connection
terminals 11 provided at the end of the lower frame 1 when the electromagnetic converter is
assembled. Provided in The amount of projection is set so that when the electrode 17 is
connected and fixed to the connection terminal 11 of the terminal plate 12 as described later, the
electrode 17 bends appropriately, and the arrangement of the vibrating film 4 and the
arrangement of the connection terminal 11 Even if there is a slight level difference or the like,
the connection can be made well.
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[0016]
The permanent magnet plates 2 and 6 are made of, for example, plate-like sintered ferrite
magnets, and these two magnet plates are configured in the same shape and size. The permanent
magnet plates 2 and 6 are formed in a shape and size that can be superimposed on the portion of
the vibrating membrane 4 where the meandering coil pattern 16 is provided, that is, all the
actually vibrating portions of the vibrating membrane 4. . The plate surfaces of the permanent
magnet plates 2 and 6 have strip-like magnetized portions extended in the longitudinal direction.
This magnetized portion is provided in a parallel stripe shape in which the S pole and the N pole
are alternately arranged, and this magnetized portion is hereinafter referred to as a multipolar
magnetized pattern. Further, in the permanent magnet plate 2, a plurality of sound radiation
holes 13 are provided at positions away from the multipolar magnetization pattern, and in the
same manner, a plurality of sound radiation holes 14 are provided in the permanent magnet
plate 6.
[0017]
The permanent magnet plate 2 mounted on the lower frame 1 as described above is mounted on
the upper surface of the lower frame 1 together with the terminal plate 12. The vibrating film 4
laminated on the permanent magnet plate 2 or the like is configured to connect the electrode 17
projecting horizontally from the edge to the terminal plate 12, so the permanent magnet plate 2
or the like is the lower frame 1. It arranges side by side so that it may not overlap with the
terminal board 12 in the upper surface of. That is, since it is not necessary to provide the
permanent magnet plate 2 and the like with a notch or the like for avoiding contact with the
terminal plate 12, the permanent magnet plate 2 and the permanent magnet plate 6 have the
same shape. And, it is formed so that it can be laminated on the whole film surface having the
meandering coil pattern 16 of the vibrating film 4, and the multipolar magnetization pattern is
configured to be opposed to the whole film surface. The permanent magnet plate 6 is stacked
above the buffer member 3, the vibrating membrane 4, the buffer member 5, and the permanent
magnet plate 2 mounted on the lower frame 1 as described above, and when these are stacked. It
is mounted on the inner side of the upper frame 7 so that its own multipolar magnetization
pattern overlaps with the multipolar magnetization pattern of the permanent magnet plate 2,
specifically, the same poles face each other.
[0018]
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The upper frame 7 is formed of a metal plate such as an iron plate as described above, and is
provided with a sound radiation hole 18 communicating with the sound radiation hole 14 of the
permanent magnet plate 6 when the permanent magnet plate 6 is mounted on the upper surface.
ing. The lower frame 1 and the upper frame 7 are provided with, for example, concave or convex
fitting portions respectively, and when joined, the lower frame 1 and the upper frame 7 are
mutually fitted by fitting of the fitting portions. It is comprised so that joining fixation may be
carried out.
[0019]
FIG. 2 is a cross-sectional view showing the configuration of the electromagnetic converter
according to the first embodiment. This figure shows a longitudinal cross section taken along the
line A-A 'shown in FIG. 1. The same reference numerals as in FIG. 1 denote the same parts in FIG.
As described above, the permanent magnet plate 2 is attached to the lower frame 1 by its own
magnetic force, and the permanent magnet plates 2 communicate with the sound radiation holes
18 of the upper frame 7 and the sound radiation holes 14 of the permanent magnet plate 6. After
positioning the plate 6, the permanent magnet plate 6 is attached to the upper frame 7 by its
own magnetic force. The lower frame 1 and the upper frame 7 to which the permanent magnet
plates 2 and 6 are attached as described above function as yoke materials of the permanent
magnet plates 2 and 6.
[0020]
The buffer member 3 is stacked on the upper surface of the permanent magnet plate 2 mounted
on the lower frame 1, and the vibrating film 4 is further stacked thereon to stack the buffer
member 5. When the upper frame 7 is joined to the lower frame 1, the permanent magnet plate
6 is disposed on the buffer member 5, and the vibrating membrane 4 is interposed between the
permanent magnet plate 2 and the permanent magnet plate 6 via the buffer members 3 and 5.
Be placed. When the respective portions are arranged in this manner, the actually vibrating
portion of the vibrating membrane 4, that is, the portion provided with the meandering coil
pattern 16 is the permanent magnet plate 2 and the permanent magnet plate 6 via the buffer
members 3 and 5. In between. Further, the electrodes 17 of the vibrating membrane 4 are not
vertically sandwiched by the permanent magnet plates 2 and 6 and the buffer members 3 and 5,
in other words, the permanent magnet plate 2, the buffer member 3, the vibrating membrane 4
and the buffer member 5, And, when the permanent magnet plate 6 is laminated, it protrudes
from the side surface portion and is soldered to the connection terminal 11 by the solder 20, for
example. As described above, the electrode 17 is connected and fixed to the connection terminal
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11, whereby the arrangement position of the vibrating film 4 is held. In addition, a tape is affixed
and fixed to the buffer members 3 and 5 etc. so that the position of the vibrating film 4 does not
shift, or a protrusion protruding from the edge is provided on the vibrating film 4 When joining
with 7, the projections may be sandwiched between them to fix the position.
[0021]
FIG. 3 is an explanatory view showing a configuration of a vibrating film of a general
electromagnetic converter. This figure shows a mode in which a T-shaped cut C is made in the
vibrating membrane 54 and this portion is bent downward to form an electrode 63 so as to open
it. The vibrating film 54 has a coil pattern 64 similar to the meandering coil pattern 16 of the
vibrating film 4 shown in FIG. 1 and the like, and the end of the coil pattern 64 is configured to
be the above-described electrode 63. . As shown in FIG. 3, when the buffer member 53 is
provided with the notch 66 and the permanent magnet plate 52 is provided with the notch 65
and the vibrating film 54 is laminated on the buffer member 53 and the permanent magnet plate
52, The bent electrode 63 is connected to, for example, a connection terminal 60 provided on the
lower frame 51 so as not to disturb the bent electrode 63. In this configuration, the electrode 63
is bent approximately 90 degrees with respect to the film surface of the vibrating film 54.
Therefore, when the electrode 63 is connected and fixed to the connection terminal 60 using, for
example, solder, stress occurs in the above-mentioned bent portion An adverse effect occurs,
such as adversely affecting the vibration of the vibrating membrane 54, and easily causing
deterioration or breakage of the connection / fixed portion.
[0022]
The electromagnetic converter shown in FIG. 1 and FIG. 2 connects the electrode 17 to the
connection terminal 11 as described above, that is, the connection terminal disposed in the
extending direction of the electrode 17 without bending the electrode 17. Since it is soldered to
11, it can be connected and fixed without causing a large stress. Further, since the permanent
magnet plates 2 and 6 can be disposed avoiding interference such as overlapping with the
terminal plate 12 in the vertical direction, all plate surfaces having the multipolar magnetization
pattern of the permanent magnet plates 2 and 6 are all It can be superimposed on the vibrating
membrane 4 to be opposed to the meandering coil pattern 16. Therefore, the electromagnetic
coupling between the permanent magnet plates 2 and 6 and the vibrating membrane 4 can be
favorably performed, and the sound can be reproduced with high sound pressure.
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[0023]
As described above, according to the first embodiment, the vibrating membrane 4 is provided
with the tongue-like electrode 17 which protrudes in the horizontal direction from the
substantially both ends of one side of the vibrating membrane 4 and the end of the meandering
coil pattern 17 is provided. Since the electrode 17 is fixedly connected to the connection terminal
11 of the terminal plate 12 disposed at the end of the lower frame 1, the connection between the
electrode 17 of the diaphragm 4 and the connection terminal 11 of the terminal plate 12 is This
has the effect of facilitating the connection and significantly improving the connection
workability. In addition, it is not necessary to form the permanent magnet plate 2 attached to the
lower frame 1 and the permanent magnet plate 6 attached to the upper frame 7 into two
different shapes using two molds, and using one metal mold There is an effect that the
permanent magnet plates 2 and 6 can be formed. Moreover, it is possible to use all for
electromagnetic coupling with the vibrating membrane 4 without cutting out the surface
provided with the multipolar magnetization pattern of the permanent magnet plates 2 and 6, and
if the size of the vibrating membrane is the same, It is possible to improve the sound pressure
level generated more than that, and to eliminate unnecessary disturbance of vibration, so that the
sound quality can be improved.
[0024]
The electromagnetic converter according to the first embodiment is configured such that the
terminal plate 12 is disposed inside when the lower frame 1 and the upper frame 7 are joined,
but the present invention By appropriately setting the amount of protrusion, the configuration is
not necessarily limited to the configuration in which the terminal board 12 is disposed inside the
frame in which the lower frame 1 and the upper frame 7 are joined.
[0025]
It is explanatory drawing which shows the structure of the electromagnetic converter by
Embodiment 1 of this invention.
FIG. 1 is a cross sectional view showing a configuration of an electromagnetic converter
according to a first embodiment. It is an explanatory view showing composition of a diaphragm
of a general electromagnetic transducer. It is explanatory drawing which shows the structure of
the conventional electromagnetic converter. It is sectional drawing which shows the structure of
the conventional electromagnetic converter.
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Explanation of sign
[0026]
1, 51 lower frame, 2, 6, 52, 56 permanent magnet plate, 3, 5, 53, 56 buffer member, 4, 54
diaphragm, 7, 57 upper frame, 11, 60 connection terminal, 12, 61 terminal Plate, 13, 14, 18
sound radiation hole, 15 resin film, 16, 64 meandering coil pattern, 17, 63 electrode, 20, 70
solder, 62 terminal connection hole, 65, 66 notch, C notch.
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