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JP2008053958

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DESCRIPTION JP2008053958
The present invention provides an electromagnetic transducer that does not disturb the
movement of a vibrating membrane during operation, enables shortening of the time for
connecting / arranging the vibrating membrane, and has stable performance regardless of the
skill of the operator. An upper frame 3 and a structure 2 in which a lower permanent magnet
plate 11 and an upper permanent magnet plate 14 having strip-like magnetized patterns in
parallel stripes and a vibrating film 13 having a meandering coil pattern 13b are stacked. The
outer wall surface of the upper frame 3 is provided with a protruding piece 13c which is
supported by being covered from the upper and lower direction by the lower frame 4 and which
protrudes from the end of the vibrating film 13 formed on the vibrating film 13 The terminal
board 5 is inserted into the notch 5 b of the installed terminal board 5 and joined to the terminal
board 5. [Selected figure] Figure 1
Electromagnetic converter
[0001]
The present invention relates to an electromagnetic converter that reproduces an audio signal
from an audio device or the like into an audible sound.
[0002]
An electromagnetic converter that generates an audible sound by using a permanent magnet and
a vibrating membrane includes a permanent magnet plate magnetized at a predetermined
position, a vibrating membrane disposed facing the permanent magnet plate, and a permanent
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magnet plate And a buffer member disposed in the gap of the vibrating membrane is stacked,
and these are covered with a frame and attached to the speaker housing.
On the permanent magnet plate, the strip-like S pole and the N pole are alternately magnetized at
a fixed interval to form a parallel stripe-shaped magnetized pattern. In the gap between the
different magnetic poles of the permanent magnet plate, a portion called a so-called neutral zone
of magnetization is generated. The vibrating membrane is opposed to the position of the abovementioned neutral zone to form a coil formed of a meander-shaped conductor pattern on the
membrane surface. When an audio signal current flows to the coil of the diaphragm, the
magnetization patterns of the coil and the permanent magnet plate are electromagnetically
coupled, and vibration by the audio signal is generated in the diaphragm according to Fleming's
left-hand rule, and an audible sound is generated. It is reproduced (see, for example, Patent
Document 1).
[0003]
FIG. 6 is an explanatory view showing a configuration of a conventional electromagnetic
converter. What is illustrated uses the flat lower frame 31 and the bowl-like upper frame 32 to
stack the lower permanent magnet plate 33, the buffer member 34a, the vibrating film 35, the
buffer member 34b and the upper permanent magnet plate 36. Are included and supported. In
the electromagnetic converter configured in this manner, lead portions 35b are provided at both
end portions of the meandering coil pattern 35a provided on the vibrating film 35, and the
terminal plate 37 is fixed / arranged to the lower frame 31, for example. By inserting the lead
portion 35b of the vibrating film 35 into the insertion hole of the electrode portion 37a provided
on the terminal plate 37 and soldering this inserted portion, the meandering coil pattern of the
terminal plate 37 and the vibrating film 35 Electrically connect with 35a. In this configuration,
the serpentine coil pattern 35a of the vibrating film 35 provided inside the lower frame 31 and
the upper frame 32 is electrically connected to the outside of the electromagnetic converter.
[0004]
JP-A-9-331596 (pages 3-5, FIGS. 1 and 2)
[0005]
Since the conventional electromagnetic converter is configured as described above, when
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connecting the lead portions provided at both ends of the coil pattern of the vibrating film to the
terminal plate, soldering is performed by visual observation, and the number of operation steps is
increased. Increase, which may damage the vibrating membrane during the assembly operation.
In addition, when the electromagnetic converter operates, there is a problem that the connection
portion described above becomes a hindrance to vibration.
[0006]
The present invention has been made to solve the above-described problems, and during
operation does not prevent the movement of the vibrating membrane, and enables shortening of
the time for connection / placement work of the vibrating membrane and relates to the skill of
the operator The purpose is to obtain an electromagnetic converter with stable performance.
[0007]
In the electromagnetic transducer according to the present invention, the vibrating membrane is
formed with a projecting piece projecting from the end of the vibrating membrane and having
the terminal electrode of the coil pattern, and provided on the outer wall surface of the frame on
the outer wall surface A terminal plate having a notch communicating with the notch portion is
provided, and a protruding piece of the vibrating membrane is inserted into the notch of the
terminal plate and joined to the terminal plate.
[0008]
According to the present invention, there is provided a terminal plate which protrudes from the
end of the vibrating membrane to form a projecting piece having the terminal electrode of the
coil pattern, and has a notch communicating with the notch portion provided on the outer wall
surface of the frame. Since the projecting piece is inserted into the notch of the terminal plate
and joined to the terminal plate, the coil pattern of the vibrating film and the terminal plate can
be connected in a short time without damaging the vibrating film, which relates to manufacturing
There is an effect that the workability can be improved.
[0009]
Hereinafter, an embodiment of the present invention will be described.
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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 showing the configuration / shape of each part of the
electromagnetic transducer 1 according to the first embodiment. The electromagnetic converter
1 is configured to cover the structure 2 in the vertical direction in the figure by a bowl-shaped
upper frame 3 and a flat lower frame 4. The upper frame 3 and the lower frame 4 are provided
with, for example, a plurality of fitting portions so as to be joined / fixed to each other. The upper
frame 3 and the lower frame 4 are made of ferrous steel or the like. The upper frame 3
illustrated here is in the form of a rectangular box and has an opening at the lower side in the
figure. The lower frame 4 is formed of a quadrilateral flat plate, and is configured to cover the
opening of the upper frame 3 described above. The structure 2 enclosed by the upper frame 3
and the lower frame 4 having such shapes also has a similar rectangular parallelepiped
rectangular shape in which the upper surface and the bottom end surface are similar. When the
upper frame 3 and the lower frame 4 are made of ferromagnetic material as described above,
when the structure 2 is covered with the upper frame 3 and the lower frame 4, the structure 2 is
formed on the inner wall surface of the upper frame 3. The upper permanent magnet plate 14 is
attracted by its own magnetic force, and the lower permanent magnet plate 11 is attracted by its
own magnetic force to the inner surface of the lower frame 4. At this time, the upper frame 3 and
the lower frame 4 serve as a yoke material of each permanent magnet plate.
[0010]
In the structure 2, the buffer member 12a is stacked on the lower permanent magnet plate 11,
the vibrating membrane 13 is stacked on the buffer member 12a, and the buffer member 12b is
stacked on the vibrating membrane 13 to form the buffer member 12a. The vibrating membrane
13 is sandwiched between the and the buffer member 12b. Further, the upper permanent
magnet plate 14 is stacked on the buffer member 12b. Thus, the lower permanent magnet plate
11, the buffer member 12a, the vibrating film 13, the buffer member 12b, and the upper
permanent magnet plate 14 are stacked to form the structure 2. The vibrating film 13 is formed
by forming a coil (hereinafter, described as a meandering coil pattern) 13b having a meandering
conductor pattern on the entire surface of a thin and flexible resin film 13a, and has a heat
resistance of about 80 ° C. For example, the resin film 13a such as polyimide resin is etched to
form a meandering coil pattern 13b from copper foil or the like deposited on the resin film 13a.
Further, the vibrating membrane 13 has a tongue-like projecting piece 13c which is extended, for
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example, in the longitudinal direction of the meandering pattern as described above and
protrudes from the end of the vibrating surface. The projecting piece 13c is, for example,
integrally formed flush with the above-described vibration surface, that is, the same material as
the resin film 13a, and includes an electrode connected to the end of the meandering coil pattern
13b. The above-mentioned electrode is formed of copper foil or the like on at least one surface or
both surfaces of the projecting piece 13c. Since the projecting piece 13c is provided with the
terminal electrode of the meandering coil pattern 13b, the vibrating membrane 13 is provided
with two projecting pieces 13c. The two projecting pieces 13 c are arranged, for example, at a
portion forming the short side of the film shape of the vibrating film 13.
[0011]
A terminal plate 5 is installed on the outer wall surface of the box-like upper frame 3. The
terminal plate 5 is provided on the outer wall surface corresponding to the projecting piece 13c
provided on the above-mentioned vibrating film 13. For example, the terminal plate 5 is installed
on the side of the upper side of the upper side It is fixed. The terminal plate 5 is provided with an
electrode portion 5a and a notch portion 5b joined to the respective projecting pieces 13c. The
terminal plate 5 is made of, for example, a plate material of an insulating material such as an
epoxy resin or a phenol resin, and the copper foil or the like deposited on the surface is subjected
to etching to form the above-mentioned electrode portion 5a. The electrode portion 5a has a
portion such as a pad for connecting a lead wire such as a signal cable, and is configured to
surround the edge of the notch portion 5b formed in the terminal plate 5. The notch portion 5b
is configured to have a shape and a dimension capable of inserting the projecting piece 13c, and
when the terminal plate 5 is attached to the upper frame 3 as described above, the upper frame 3
and the lower frame It is formed in the position which can insert the protrusion piece 13c which
protrudes from the structure 2 enclosed by 4. FIG. The notch 5b illustrated here is configured to
reach the lower end portion of the terminal plate 5 in FIG. 1 so as to facilitate the insertion of the
protruding piece 13c. Also, the width of the notched portion, that is, the horizontal dimension in
the figure, is substantially the same as the width of the tongue-like protruding piece 13c, and is
slightly wider. The side surface of the upper frame 3 is provided with, for example, a cut portion
or a cut portion communicating with the cut portion 5 b in correspondence with the cut portion
5 b. Further, on the upper surface of the upper frame 3, a plurality of sound radiation holes 3a
respectively communicating with the sound radiation holes 14a provided in the upper permanent
magnet plate 14 are provided.
[0012]
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FIG. 2 is a cross-sectional view showing the configuration of the electromagnetic converter
according to the first embodiment. The same reference numerals are used for the same parts as
those shown in FIG. 1, and the description thereof is omitted. This figure shows a longitudinal
cross section in the lateral direction on the top surface of the electromagnetic transducer 1
shown in FIG. 1, and represents a cross sectional configuration orthogonal to the longitudinal
direction of the serpentine coil pattern 13b formed on the vibrating membrane 3. ing. In FIG. 2,
the buffer members 12 a and 12 b are not shown in order to make the configuration easy to
understand. The lower permanent magnet plate 11 and the upper permanent magnet plate 14
are made of, for example, sintered ferrite magnets, and when stacked, form parallel stripe-shaped
magnetized portions over the entire surface facing the vibrating film 13. ing. That is, it has a
magnetized pattern consisting of a plurality of strip-shaped magnetized portions. This
magnetized pattern is magnetized at regular intervals so that the S pole and the N pole are
alternately arranged. Hereinafter, such a magnetized pattern is referred to as a multipolar
magnetized pattern. When the lower permanent magnet plate 11 and the upper permanent
magnet plate 14 are laminated together with other members to constitute the structure 2, the
magnetized portions of the lower permanent magnet plate 11 and the upper permanent magnet
plate 14 have the same polarity. The above multipolar magnetization patterns are formed to
overlap each other. By providing such a multipolar magnetization pattern, when the structure 2
is configured, a so-called neutral zone of magnetization between the magnetic poles, that is,
between the magnetization portion of the S pole and the magnetization portion of the N pole. nz
occurs.
[0013]
The meandering coil pattern 13b of the vibrating membrane 3 is disposed in the neutral zone nz
when the permanent magnet plates and the vibrating membrane 3 are stacked, that is, the lower
permanent magnet plate 11 and the upper permanent magnet plate 14 It is formed to be
disposed between the magnetic poles of the multipolar magnetization pattern. In other words, in
the multipolar magnetization pattern of each permanent magnet plate, strip-like magnetized
portions are formed along each pattern in the longitudinal direction of the meandering coil
pattern 13b. Also, the sound emission holes 3a of the upper frame 3 and the sound emission
holes 14a of the upper permanent magnet plate 14 are arranged above the pattern extending in
the longitudinal direction of the meander coil pattern 13b, ie, It is provided at a constant pitch so
as to coincide with the position of the neutral zone nz.
[0014]
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FIG. 3 is an explanatory view showing the configuration of the electromagnetic converter
according to the first embodiment. The same parts as those shown in FIGS. 1 and 2 are denoted
by the same reference numerals, and the description thereof is omitted. This figure shows a state
in which the projecting piece 13c of the vibrating membrane 3 is fixed to the terminal plate 5
provided on the side surface of the upper frame 3, and is a side view of the completed
electromagnetic converter 1. The terminal plate 5 is fixed to the outer wall side surface of the
upper frame 3 using, for example, an adhesive. Alternatively, a projection may be provided on the
side surface of the upper frame 3 and an eyelet may be provided on the terminal plate 5 and the
terminal plate 5 may be fixed by pressing the eyelet against the projection. .
[0015]
The terminal plate 5 has a not-shown notched portion provided on the side surface of the upper
frame 3 with the electrode portion 5a facing the outside of the electromagnetic converter 1 so as
to facilitate connection of a connection cable described later. It is positioned so as to
communicate with the notch 5 b of the terminal plate 5 and fixed to the upper frame 3. The
vibrating membrane 13 forming the structure 2 is contained in and supported by the upper
frame 3 and the lower frame 4, so that the vibrating membrane 13 in which the terminal plate 5
joined to the projecting piece 13 c is laminated as the structure 2 Installed on the side of the
vertical frame. When the terminal plate 5 is fixed to, for example, the upper frame 3 in this
manner, a structure in which stress is hardly applied to the projecting pieces 13 c in the
manufacturing process of supporting the structural body 2 including the vibrating film 13 inside
the upper frame 3 and lower frame 4 It becomes. Therefore, it becomes easy to assemble the
electromagnetic transducer 1 without damaging the vibrating film 13 including the projecting
piece 13c, and the working efficiency is improved.
[0016]
As described above, when the terminal board 5 is fixed to the upper frame 3 and the structure 2
is covered with the upper frame 3 and the lower frame 4, the projecting pieces 13 c protruding
from the structure 2 are notches of the terminal board 5. Insert into 5b. With the upper frame 3
and the lower frame 4 covering the structure 2, the electrode portion of the projecting portion
13 c protruding from the notch 5 b is soldered to the electrode portion 5 a of the terminal plate
5. Thus, as shown in FIG. 3, the projecting portion 13c is joined to the terminal plate 5 by the
solder 20 and electrically connected. Thus, the electric connection of the meandering coil pattern
13b of the vibrating film 13 disposed in the frame is configured to be performed with the
outside.
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[0017]
Further, the projecting piece 13c is inserted deep into the notch 5b of the terminal plate 5 so as
to push up the projecting piece 13c to the upper end of the notch 5b in FIG. The projecting piece
13c projecting from the covered structure 2 is drawn out from the notch 5b of the terminal plate
5 to the outside of the frame, for example, as much as possible to the outside and joined to the
electrode portion 5a of the terminal plate 5. In this way, the positional relationship between the
meandering coil pattern 13b of the diaphragm 3 and the multipolar magnetization pattern of the
lower permanent magnet plate 11 and the upper permanent magnet plate 14 in the state of
being covered by the upper frame 3 and the lower frame 4 Becomes as shown in FIG. 2, and the
diaphragm 13 is positioned. In other words, in order to position the diaphragm 13 with respect
to the lower permanent magnet plate 11 and the upper permanent magnet plate 14 to be
stacked, the size, the shape of the projecting piece 13c and the position to be provided on the
diaphragm 13 are determined. 13c and the vibrating membrane 13 are formed, and the terminal
plate 5 is made to correspond to the above-mentioned projecting piece 13c, and in detail, it
corresponds to the projecting piece 13c projecting from the structure 2 in which the vibrating
membrane 13 is laminated with other members. Then, the upper frame 3 is installed / fixed at an
appropriate position.
[0018]
FIG. 4 is an explanatory view showing the configuration of the electromagnetic converter
according to the first embodiment. This figure shows another configuration of the terminal plate
5 used in the electromagnetic converter 1, and the same reference numerals are used for the
same or corresponding parts as those shown in FIG. The terminal plate 5 shown in FIG. 4
includes an eyelet 5c made of phosphor bronze, for example, in place of the notch 5b, and is
configured to be in pressure contact with a projecting piece extending from the diaphragm 3. . In
addition, the eyelet 5c illustrated in FIG. 4 has a slit extended upward from the lower end of the
terminal plate 5, and when using such an eyelet 5c, the projecting piece to be protruded from the
diaphragm 13 is the resin film 13a. It is provided so as to stand vertically to the vibration plane
of the above so that it can be easily inserted into the above-mentioned slit from the lower end
side of the terminal board 5. Further, the eyelet 5 c is provided on the terminal plate 5 by
electrically connecting to the electrode portion 5 a to which a lead wire such as a connection
cable is connected.
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[0019]
FIG. 5 is an explanatory view showing an installation state of the electromagnetic converter
according to the first embodiment. The same reference numerals are used for the same parts as
those shown in FIG. This figure shows a state where the electromagnetic converter 1 is installed
and fixed to an acoustic box 21 equipped with, for example, a speaker or the like on which the
electromagnetic converter 1 is mounted. When the electromagnetic transducer 1 is installed in
the acoustic box 21 or the like, an adhesive or the like is applied to the back surface portion of
the lower frame 4 and installed / fixed on the front of the acoustic box 21 or the like. A signal
cable 22 for inputting an audio signal or the like is connected to the electromagnetic converter 1
installed in the acoustic box 21 or the like. In the signal cable 22, the lead wire core material of
the signal cable 22 is soldered to the pad portion of the electrode portion 5a provided on the
terminal board 5, or the lead wire core material of the signal cable 22 is provided in the electrode
portion 5a. It inserts in the land hole which there is, performs soldering, and connects to
meandering coil pattern 13b through the terminal board 5. FIG. As described above, since the
electromagnetic converter 1 is often used by fixing the back side to the acoustic box 21 etc.,
when installing the terminal plate 5 on the upper frame 3 etc., for example, the electromagnetic
converter as described above It is fixed so as to protrude in the front of 1, that is, in the direction
of emitting the reproduced sound.
[0020]
When assembling the electromagnetic transducer 1, the upper frame and the lower frame 4 are
inserted by inserting the projecting piece 13 c of the diaphragm 13 or the like into the notch 5 b
of the terminal plate 5 configured as described above or the slit of the eyelet 5 c. Positioning of
the diaphragm 13 contained in the film is performed with sufficient accuracy, and the respective
members are stacked to form the structure 2, and the upper frame 3 and the lower frame 4
further easily cover the structure 2 It will be able to process. Specifically, the serpentine coil
pattern 13b of the vibrating film 5, the lower permanent magnet plate 11, and the upper
permanent magnet are formed by inserting the protruding piece 13c or the like of the vibrating
film 13 into the notch 5a or the slit and fixing to the terminal plate 5. The positional relationship
with the multipolar magnetization pattern formed on each plate 14 is as shown in FIG. 2, and the
structure 2 can be configured without performing a fine alignment operation. Further, since the
electrical connection of the meandering coil pattern 13b is performed outside the upper frame 3
and the lower frame 4, that is, at a position sufficiently away from the vibrating surface of the
vibrating membrane 13, the above connection portion is the vibration of the vibrating membrane
13. It can reduce the hindrance.
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[0021]
As described above, according to the first embodiment, the terminal plate 5 is installed on the
side surface of the upper frame 3, and the projecting piece 13 c protruding from the film end of
the vibrating film 13 is connected to the electrode portion 5 a of the terminal plate 5. Since the
vibration film 13 and the terminal plate 5 can be connected in a short time without damaging the
vibration film 13, there is an effect that the workability relating to manufacturing can be
improved.
[0022]
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. FIG. 1 is an explanatory view showing a configuration of an
electromagnetic converter according to a first embodiment. FIG. 1 is an explanatory view
showing a configuration of an electromagnetic converter according to a first embodiment. 5 is an
explanatory view showing an installation state of an electromagnetic converter according to
Embodiment 1. FIG. It is explanatory drawing which shows the structure of the conventional
electromagnetic converter.
Explanation of sign
[0023]
DESCRIPTION OF SYMBOLS 1 electromagnetic transducer, 2 structure, 3, 32 upper frame, 3a
sound radiation hole, 4, 31 lower frame, 5, 37 terminal board, 5a, 37a electrode part, 5b notch
part, 5c eyelet, 11, 33 Lower permanent magnet plate, 12a, 12b, 34a, 34b buffer member, 13, 35
diaphragm, 13a resin film, 13b, 35a meandering coil pattern, 13c projecting piece, 14, 36 upper
permanent magnet plate, 14a sound radiation hole, 20 solder, 21 acoustic box, 22 signal cable,
35b lead.
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