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JP2009278214

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DESCRIPTION JP2009278214
The present invention provides an electro-acoustic transducer capable of providing variations in
the shape of a diaphragm while reducing the thickness. A diaphragm ring 1 is bent in one
direction at a bending angle of about 90 degrees from a flat ring portion 3 arranged in a plane
perpendicular to an axis of a voice coil 8 and an outer peripheral edge of the flat ring portion 3.
By forming the L-shaped cross section having the wall portion 4 to be formed, the electroacoustic transducer can be thinned by the thin, light and strong diaphragm ring 1. Further, the
shape of the receiving surface 16 of the frame 9 remains unchanged, and the shape of the
surface to which the diaphragm is attached of the diaphragm ring 1 is changed to bring about
variations in the shape of the diaphragm 6. [Selected figure] Figure 2
Electro-acoustic transducer
[0001]
BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an
electroacoustic transducer such as a small and thin speaker, receiver and the like used in a
mobile phone and the like.
[0002]
Conventionally, a magnetic circuit having a yoke, a magnet and a pole piece, a vibration system
having a diaphragm ring comprising a diaphragm, a voice coil and a flat ring disposed in a plane
perpendicular to the axis of the voice coil, and these magnetic circuits And a frame for holding a
vibration system, wherein the outer periphery of the diaphragm is fixed to the outer periphery of
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the frame via the diaphragm ring, and the voice coil is disposed in a magnetic gap. It is known
(refer patent document 1).
Japanese Patent Laid-Open No. 2003-264890
[0003]
However, in the diaphragm ring consisting of a flat plate disposed in a plane perpendicular to the
axis of the voice coil, a large thickness is required to secure its strength. In addition, when
changing the shape of the diaphragm, it is necessary to change not only the inner shape of the
diaphragm ring but also the outer shape, and accordingly the receiving surface of the frame
needs to be changed, which brings about variations in the shape of the diaphragm. It was
difficult.
[0004]
Therefore, the electro-acoustic transducer of the present invention comprises a magnetic circuit
having a yoke, a magnet and a pole piece, a vibration system having a diaphragm, a voice coil
and a diaphragm ring, and a frame for holding these magnetic circuits and vibration system. In
the electro-acoustic transducer, wherein the outer periphery of the diaphragm is fixed to the
outer periphery of the frame via the diaphragm ring, and the voice coil is disposed in a magnetic
gap, the diaphragm ring is the voice coil The flat ring portion disposed in a plane perpendicular
to the axis of the frame, and the wall portion formed by bending in one direction at a bending
angle of about 90 degrees from the outer peripheral edge of the flat ring portion It is a thing.
[0005]
With this diaphragm ring having an L-shaped cross section, a large thickness is not necessary.
Further, the shape of the receiving surface of the frame can be changed as it is, the shape of the
surface to which the diaphragm is attached can be changed.
[0006]
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As described above, the electro-acoustic transducer of the present invention can easily make the
electro-acoustic transducer thinner by using a thin, light and strong diaphragm ring. Further,
variations in the shape of the diaphragm can be brought about by changing the shape of the
diaphragm attaching surface of the diaphragm ring without changing the shape of the receiving
surface of the frame.
[0007]
Hereinafter, embodiments of the present invention will be described based on the drawings.
[0008]
FIG. 1 is a perspective view of a diaphragm ring 1 according to this embodiment. This diaphragm
ring 1 is a semi-finished product of a square cylindrical shape with a shallow bottom by pressing
(drawing) a sheet-like metal material. And the bottom of this semi-finished product is punched to
form a product, having a rectangular opening 2 and having a square outer shape, and a plane
perpendicular to the axis of the voice coil 8 described later. It has the flat ring part 3 arrange |
positioned inside, and the wall part 4 bent and formed in one direction by about 90 degrees of
bending angles from the outer periphery of this flat ring part 3, and it forms in a cross-sectional
L shape.
[0009]
FIG. 2 is a half sectional view of a vibration system 5 using the diaphragm ring 1 shown in FIG. 1.
This vibration system 5 is a wall 4 with the diaphragm ring 1 facing downward from the outer
peripheral edge of the flat ring portion 3. The diaphragm 6 is made of resin or metal film and has
an oval outer shape on the upper surface of the flat plate ring portion 3 at the top of the
diaphragm ring 1. The diaphragm 6 is formed by winding a conducting wire whose outer surface
is covered with an insulating layer, and a square tubular shape in which two lead wires 7 which
are a winding start wire and a winding finish wire are drawn from the lower end. It is stuck on
the upper end portion of the voice coil 8.
[0010]
FIG. 3 is a perspective view of the frame 9 according to the present embodiment. This frame 9 is
formed by pressing (drawing) a sheet-like metal material so as to rise at a right angle from the
rectangular bottom plate 10 and its outer periphery. While forming a shallow bottomed square
cylindrical semi-finished product provided with the side wall 11, the bottom plate 10 is cut and
bent, and the four outer portions of the bottom plate 10 are cut and raised to form the side wall
11. A square-shaped bottomed frame-shaped yoke portion 12 which is slightly smaller on the
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inner side is formed on the inner side to form a yoke-integrated product.
[0011]
The yoke portion 12 is constituted by four yoke side walls 13 facing to the inside of the side wall
11 at predetermined intervals, and a square yoke bottom plate 14 formed by the central portion
of the bottom plate 10 inside the respective yoke side walls 13. The openings 15 formed by
cutting and raising the bottom plates 10 of the respective yoke side walls 13 are provided on the
outer sides of the respective yoke side walls 13.
[0012]
Further, the frame 9 is provided with a receiving surface 16 of the diaphragm ring 1.
The receiving surface 16 is provided on the upper portion of the side wall 11 of the frame 9 and
the flat ring portion of the diaphragm ring 1 with the inner surface of the wall portion 4 of the
diaphragm ring 1 in contact with the outer surface of the side wall 11 of the frame 9 The lower
surface 3 is supported by the upper end surface of the side wall 11 of the frame 9 from the lower
side.
[0013]
FIG. 4 is a central longitudinal cross-sectional view of a rectangular speaker (an example of an
electroacoustic transducer) 17 assembled using the frame 9 shown in FIG. 1, and FIG. 5 shows a
baffle, a diaphragm and a diaphragm ring of the speaker. FIG. 9 is a plan view of the transparent
state, the speaker 17 includes a yoke portion 12 of the frame 9, a magnet 18 which is a square
pole permanent magnet adhered and fixed onto the yoke bottom plate 14 of the yoke portion 12,
and the magnet A magnetic circuit 21 is constituted by a pole piece 20 made of a rectangular
metal plate which is adhesively fixed on the upper surface 18 and whose outer surface is
opposed to each yoke side wall 13 of the yoke portion 12 with a magnetic gap 19 therebetween.
[0014]
Further, an external connection terminal 23 formed of a cantilevered spring piece integrated with
the insulator 22 by insert molding, which is formed by punching and bending a thin metal plate,
is provided. Are fixed to the two openings 15 on the longitudinal side of the frame 9 respectively
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via the insulators 22 and each external connection terminal 23 is projected from the bottom of
the frame 9 to the outside through the two openings 15 on the longitudinal side, One surface is
exposed and embedded on the upper surface of the body 22, and the soldering pad 24
electrically connected to the external connection terminal 23 is extended to the longitudinal side
2 in the frame 9 through the two openings 15 on the longitudinal side. The outer bottoms of the
two yoke side walls 13 are exposed.
The two short-side openings 15 are used as back sound holes of the speaker 17.
[0015]
Then, the diaphragm ring 1 is fitted and fixed to the receiving surface 16 provided on the side
wall 11 of the frame 9 through an adhesive, and the outer periphery of the diaphragm 6 is
attached to the outer periphery of the frame 9 via the diaphragm ring 1. In addition to bonding
and fixing, the voice coil 8 is disposed in the magnetic gap 19, and the magnetic circuit 21 and
the vibration system 5 are integrally connected by the frame 9 to complete the process.
The two lead wires 7 drawn from the lower end portion of the voice coil 8 are routed in the
frame 9 and guided to the soldering pad 24 to be connected, and are connected there by
soldering.
Moreover, while pressing (drawing) a sheet-like metal material to form a ceilinged square
cylindrical semi-finished product, the upper portion of this semi-finished product is subjected to
punching to obtain a product, A baffle 26 having a front sound hole 25 of the speaker 17 is
provided at the top portion, and the ceiling 26 with the square tubular baffle 26 and the
bottomed square tubular frame 9 are fitted to each other to form the front of the diaphragm 6.
The side is covered with a top with a front sound hole 25 of the baffle 26.
[0016]
The speaker 17 configured in this way is used, for example, in a mobile phone, and when an
electric acoustic signal is input to the voice coil 8 from the external circuit through the pair of
external connection terminals 23, the magnetic field generated in the magnetic circuit 21 The
voice coil 8 vibrates up and down due to the interaction with the magnetic field generated by the
energization of the voice coil 8, and the diaphragm 6 vibrates up and down accordingly to
generate sound.
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[0017]
According to the above-described embodiment, the flat plate ring portion 3 in which the
diaphragm ring 1 is disposed in a plane perpendicular to the axis of the voice coil 8 and the
bending edge of approximately 90 degrees from the inner peripheral edge of the flat plate ring
portion 3 The diaphragm ring 1 is thin, light and strong, and has the wall portion 4 formed by
bending downward and has an L-shaped cross section, so that the speaker 17 can be easily
thinned. .
[0018]
Further, according to the diaphragm ring 1 having the L-shaped cross section, the outer shape of
the flat plate ring portion 3 of the diaphragm ring 1 is changed as it is, and the inner shape
(shape of the opening 2) is changed. The shape of the contact surface (the lower surface of the
flat ring portion 3 and the inner surface of the wall portion 4) to 16 can be changed without
changing the shape of the diaphragm attachment surface (upper surface of the flat ring portion
3). Can bring about variations in the shape of
[0019]
In the present embodiment, the inner shape of the flat ring portion 3 of the diaphragm ring 1 is
oval according to the shape (elliptical shape) of the diaphragm 6, but, for example, as shown by a
two-dot chain line in FIG. By changing into a quadrangle smaller than the outer shape of the ring
portion 3, a quadrangular diaphragm can be used.
[0020]
Further, as shown in FIG. 6, with the outer surface of the wall 4 of the diaphragm ring 1 in
contact with the inner surface of the side wall 11 of the frame 9, the lower surface of the flat ring
portion 3 of the diaphragm ring 1 is the side wall of the frame 9. 11 When the frame 9 is
provided with a support surface 16A supported from the lower side on the step surface of the
inner surface, the diaphragm ring 1 is used upside down, that is, the upward wall portion 4 is
raised from the outer peripheral edge of the flat ring portion 3. The outer peripheral part of the
diaphragm 6 is attached to the upper surface of the flat plate ring 3 with the L-shaped cross
section. Also in this case, the outer shape of the flat plate ring 3 of the diaphragm ring 1 remains
unchanged. The shape of the contact surface of the diaphragm ring 1 to the receiving surface
16A of the frame 9 (the lower surface of the flat ring portion 3 and the outer surface of the wall
4) remains the same as the vibration plate attachment surface (flat ring portion The shape of the
top of 3) can be changed Because, it is possible to bring variation in shape of the diaphragm 6.
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[0021]
In the present embodiment, the electroacoustic transducer according to the present invention has
been described using the square speaker 17 using the square yoke integrated frame 9, but a
round shape using a round yoke integrated frame is used. In addition to the speaker, a square or
round speaker using a resin frame separate from the yoke, or a surface mount type speaker in
which the external connection terminal is exposed substantially flush with the bottom of the
speaker may be used.
The present invention is not limited to the above embodiment, and various modifications can be
made without departing from the scope of the invention.
[0022]
The perspective view of the diaphragm ring in the embodiment of the present invention. The half
sectional view of the vibration system in the embodiment of the present invention. The
perspective view of the frame in the embodiment of the present invention. The central
longitudinal cross section of the electroacoustic transducer in the embodiment of the present
invention Top view of the state in which the baffle and the diaphragm and diaphragm ring of the
electro-acoustic transducer in the embodiment of the invention are made transparent The half
sectional view of the vibration system showing another application example of the diaphragm
ring in the embodiment of the present invention
Explanation of sign
[0023]
DESCRIPTION OF SYMBOLS 1 diaphragm ring 2 opening 3 flat plate ring part 4 wall part 5
vibration system 6 diaphragm 8 voice coil 9 frame 12 yoke part 16, 16A receiving surface 18
magnet 19 magnetic gap 20 pole piece 21 magnetic circuit
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