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DESCRIPTION JP2009033279

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DESCRIPTION JP2009033279
The present invention relates to a thin type speaker and an electronic device using the same, and
it is an object of the present invention to provide a speaker which can be made thin and prevent
a rolling phenomenon to reduce a gap defect. In order to achieve this object, according to the
present invention, a second plate-like magnet 7 and a first plate-like magnet 12 which are
disposed horizontally or substantially horizontally via a magnetic gap, and the above-mentioned
magnetism The first plate-like magnet 12 forms a magnetic pole at its plate end, and the platelike magnet 7 is provided with a voice coil 10 movably disposed in a gap and a diaphragm 9
coupled to the voice coil 10. A magnetic pole is formed at both ends in the thickness direction,
and in the voice coil 10 portion in the magnetic gap, the magnetic flux is substantially orthogonal
to the voice coil 10 portion, and the first plate magnet 12 The magnetic fluid 14 is interposed
only between the longitudinal inner end portion of the above and the voice coil 10. [Selected
figure] Figure 6
Loudspeaker and electronic device using it
[0001]
The present invention relates to a thin type speaker and an electronic device using the same.
[0002]
Since a reduction in thickness is required for electronic devices such as portable devices, a
reduction in thickness for speakers incorporated in the main body is also required.
[0003]
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1
In order to make the speaker thinner, it is natural to miniaturize the magnet for forming the
magnetic circuit. However, if the magnet is made smaller, the magnetic force becomes smaller,
and as a result, the sound output is also reduced. In fact, the magnet can not be made so small
(for example, such a prior art is described in Patent Document 1 below) because it becomes
smaller.
JP, 2005-51283, A
[0004]
As described above, conventionally, the type of speaker built into electronic devices such as
portable devices has been made thinner, but the magnet can not actually be made much smaller
in order to avoid the reduction in audio output. However, as a result, there has been the problem
that a sufficiently satisfactory thinning has not been achieved.
[0005]
Therefore, it is an object of the present invention to reduce the thickness and to increase the
sound output, to prevent the rolling phenomenon and to reduce the gap failure.
[0006]
And in order to achieve this object, according to the present invention, first and second plate-like
magnets disposed horizontally or substantially horizontally via a magnetic gap, and a voice coil
disposed movably in the magnetic gap And a diaphragm coupled to the voice coil, wherein the
first plate magnet forms a magnetic pole at the plate end, and the second plate magnet forms a
magnetic pole at both ends in the thickness direction. The voice coil portion in the magnetic gap
has a configuration in which the magnetic flux is substantially orthogonal to the voice coil
portion, and the magnetic fluid is interposed between the voice coil and the longitudinal inner
end of the first plate-like magnet Intervened.
[0007]
As described above, according to the present invention, the first and second plate-like magnets
disposed horizontally or substantially horizontally via the magnetic gap, the voice coil disposed
movably in the magnetic gap, and the voice coil And the first plate-like magnet forms a magnetic
pole at the plate end, the second plate-like magnet forms a magnetic pole at both ends in the
thickness direction, and the magnetic gap In the voice coil portion of the speaker, the magnetic
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flux is substantially orthogonal to the voice coil portion, and the speaker is disposed in the
horizontal direction or the substantially horizontal direction of the magnetic gap through the
magnetic gap, so that thinning can be achieved. Furthermore, since the first and second plate-like
magnets are disposed on both sides of the magnetic gap, the magnetic output can be enhanced
by increasing the magnetic force.
[0008]
Further, by interposing the magnetic fluid between the voice coil and the longitudinal inner end
of the first plate-like magnet, it is possible to prevent the rolling phenomenon and to reduce the
gap defect and to improve the heat radiation effect from the voice coil. As a speaker, high input
tolerance can be achieved.
[0009]
Hereinafter, an embodiment of the present invention will be described by taking a mobile phone
as an electronic device as an example and using the accompanying drawings.
[0010]
In FIG. 1, reference numeral 1 denotes a main body, and a lid 2 is openably connected to the
main body 1.
When viewed from the rear side in FIG. 1, the main body 1 is provided with operation buttons
(not shown), and the lid 2 is provided with a liquid crystal display (not shown), as in a general
mobile phone. It is done.
[0011]
Also, two covers 3 are provided on the outer surface side of the main body 1 as shown in FIG. 1,
and the speaker 4 shown in FIGS. 2 and 3 is mounted in the main body 1 on the back side of
these covers 3 .
[0012]
As shown in FIG. 3, the speaker 4 is provided between the plate 5 on the surface side formed of
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the non-magnetic stainless steel 301 and the plate 6 formed of the cold-rolled steel plate, which
is magnetic, from the plate 6 side. A second plate-like magnet 7 made of neodymium, a ring 8
formed of a cold-rolled steel plate which is a magnetic body, a diaphragm 9 formed of a PEI resin
film, a copper wire, etc. A voice coil 10, a ring 11 formed of a cold-rolled steel plate which is a
magnetic body, and two first plate magnets 12 made of neodymium are sequentially disposed.
A magnetic fluid 14 is interposed between the longitudinal inner end of the two first plate-like
magnets 12 and the voice coil 10.
[0013]
A part of the surface of the plate 5 and the outer peripheral side of each part are covered with a
resin frame 13 as shown in FIGS.
[0014]
As shown in FIG. 3, FIG. 5, and FIG. 6, the plate 6 has an oval shape, and a rectangular second
plate-like magnet is provided on the upper flat surface of the rectangular fixing portion 6A in the
longitudinal central axial portion. The lower surface 7 is fixed by an adhesive (not shown), and
rectangular openings 6B are formed on both sides of the fixing portion 6A.
[0015]
The ring 8 is fixed to the outer peripheral portion of the plate 6 in a state where it can pass the
magnetic flux.
[0016]
Further, the outer periphery of the diaphragm 9 is placed on the ring 8, and the ring 11 is placed
on the outer periphery of the diaphragm 9.
[0017]
Further, the upper surface of the two first plate-like magnets 12 is fixed by an adhesive (not
shown) on the lower surface portion of the plate 5 facing the opening 6 B of the plate 6 above
the diaphragm 9. There is.
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The outer peripheral surface of each of the two first plate magnets 12 is an adhesive (not shown)
for bonding the upper surface of the two first plate magnets 12 to the lower surface portion of
the plate 5. A part is also fixed to the frame 13 by entering between the outer peripheral surface
of the first plate magnet 12 and the inner peripheral surface of the frame 13.
[0018]
As shown in FIG. 6, an oval-shaped voice coil 10 is fixed to the upper surface of the diaphragm 9
at a portion corresponding to the outer periphery of the second plate-like magnet 7.
[0019]
A magnetic fluid 14 is interposed between the longitudinal inner end of the two first plate-like
magnets 12 and the voice coil 10.
[0020]
In the state configured as described above, as shown in FIG. 7, two neodymium-made first plate
magnets 12 are magnetized such that the longitudinal inner end is N pole and the outer end is S
pole. ing.
[0021]
Further, as shown in FIG. 7, the neodymium second plate-like magnet 7 is magnetized such that
the surface side in the thickness direction is S pole and the lower side in the thickness direction is
N pole.
[0022]
As a result, as shown in FIGS. 4 and 7, the magnetic fluxes emitted from the inner N pole of each
of two neodymium first plate-like magnets 12 (in FIG. Only the magnetic flux coming out of the
first plate-like magnet 12 travels approximately horizontally inward and traverses the voice coil
10 in a substantially orthogonal state, and then the upper surface of the second plate-like magnet
7 (The first plate magnet 12 and the second plate magnet 7 are described as being disposed
horizontally or substantially horizontally, but this substantially horizontal state is shown in FIG.
As shown in 6, the first plate magnet 12 and the second plate magnet 7 are partially overlapped
in the thickness direction in the thickness direction, and both are not partially overlapped in the
thickness direction. It also includes the approaching state.
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That is, it is important to advance the magnetic flux so as to be substantially orthogonal to the
voice coil 10, and at that point, a slight width is set in the horizontal state. ).
[0023]
Thereafter, the magnetic flux emitted from the N pole of the lower surface of the second platelike magnet 7 travels on the rectangular fixing portion 6A of the plate 6, passes through the ring
8 and the outer peripheral portion of the diaphragm 9, and enters the ring 11 After advancing
the ring 11 by, for example, a quarter turn, the ring 11 enters the outer periphery S pole of the
first plate-like magnet 12 fixed to the inner periphery of the ring 11 as shown in FIG.
[0024]
Then, the flow of the above magnetic flux directly becomes a magnetic circuit, and in this
magnetic circuit, a magnetic gap is formed between the inner N pole of the first plate magnet 12
and the upper surface S pole of the second plate magnet 7, and this magnetic gap The voice coil
10 is given an electromagnetic field driving force, whereby the vibration is transmitted to the
diaphragm 9 to which the voice coil 10 is fixed, and an audio output is generated.
[0025]
Here, the progression of the magnetic flux in the magnetic gap will be described again.
[0026]
The magnetic flux emitted from the inner N pole of each of the first plate-like magnets 12 shown
in FIGS. 4 and 7 travels approximately horizontally inward in the magnetic gap and crosses the
voice coil 10 in a substantially orthogonal state. This is very important in order to increase the
electromagnetic field driving force, which is a major feature of this embodiment.
[0027]
In the present embodiment, the reason why the magnetic flux travels approximately horizontally
inward in the magnetic gap and crosses the voice coil 10 in a substantially orthogonal state will
be considered.
[0028]
Generally speaking, the magnetic flux from the N pole of the first plate magnet 12 tends to travel
obliquely to the S pole of the upper surface of the second plate magnet 7 whose distance is short
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(in this case) The magnetic flux crosses the voice coil 10 slightly and obliquely), and the
repulsion of the N pole of the lower surface of the second plate-like magnet 7 actually causes the
repulsion to be lifted, and as a result, the present embodiment In the embodiment, the magnetic
flux travels approximately horizontally inward at the magnetic gap, and is considered to cross the
voice coil 10 substantially orthogonally.
[0029]
In the present embodiment, since the first plate magnet 12 and the second plate magnet 7 are
provided on both sides of the magnetic gap as described above, the so-called magnetic force is
increased, and as a result, the sound output by the diaphragm 9 Can also be big.
[0030]
The first plate-like magnet 12 and the second plate-like magnet 7 for increasing the magnetic
force are literally plate-like and themselves thin, and as a result, the overall shape can be made
very thin. .
[0031]
A magnetic fluid 14 is interposed between the longitudinal inner end of the two first plate-like
magnets 12 and the voice coil 10.
By the function of the magnetic fluid 14, the rolling phenomenon can be suppressed and the gap
defect can be reduced, and also the heat radiation effect from the voice coil 10 can be improved,
thereby achieving high input resistance.
[0032]
In addition, when a magnetic fluid is used for the magnetic gap in the speaker structure having a
conventional annular magnetic circuit, the internal air is sealed by the magnetic fluid, so that the
flow of air is blocked and the characteristic is deteriorated. However, in the configuration of the
present invention, the magnetic fluid 14 intervenes only between the longitudinal inner end
portions of the two first plate-like magnets 12 and the voice coil 10, so that the flow of air is
blocked. The vibration of the diaphragm 9 is not limited.
[0033]
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As described above, according to the present invention, the first and second plate-like magnets
disposed horizontally or substantially horizontally via the magnetic gap, the voice coil disposed
movably in the magnetic gap, and the voice coil And the first plate-like magnet forms a magnetic
pole at the plate end, the second plate-like magnet forms a magnetic pole at both ends in the
thickness direction, and the magnetic gap In the voice coil portion of the speaker, the magnetic
flux is substantially orthogonal to the voice coil portion, and the speaker is disposed in the
horizontal direction or the substantially horizontal direction of the magnetic gap through the
magnetic gap, so that thinning can be achieved. Furthermore, since the first and second plate-like
magnets are disposed on both sides of the magnetic gap, the magnetic output can be enhanced
by increasing the magnetic force.
[0034]
Furthermore, by interposing the magnetic fluid between the voice coil and the longitudinal inner
end of the first plate-like magnet, it is possible to suppress the rolling phenomenon and reduce
the gap defect, and the heat radiation effect from the voice coil is also improved. Thus, high input
resistance can be achieved.
[0035]
As a result, it becomes very easy to utilize for portable apparatuses, such as a mobile telephone.
[0036]
The perspective view which applied one embodiment of the present invention to a mobile phone.
The perspective view which applied one embodiment of the present invention to a mobile phone.
The exploded perspective view of the same speaker. The exploded perspective view of the same
speaker. Cross-sectional view of the same speaker cut in the lateral direction An enlarged crosssectional view of part A of FIG. 6
Explanation of sign
[0037]
Reference Signs List 1 main body 4 speaker 7 second plate magnet 12 first plate magnet 14
magnetic fluid
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