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JP2000253489

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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 JP2000253489
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
so-called electrodynamic loudspeaker in which a diaphragm is driven by the electromagnetic
force of magnetic flux in a magnetic gap and current flowing through a voice coil. And a thin
speaker capable of entering the vibration area of the diaphragm.
[0002]
2. Description of the Related Art Recently, with the development of, for example, a large-sized
liquid crystal display (LCD), thinning of display devices such as monitors and television receivers
is being promoted. On the other hand, in many cases, a speaker is integrated into these display
devices in many cases, and there is a strong demand for thinning of the speaker itself, and in
order to cope with this, it is disclosed in JP-A-1-126899. Thin speakers have been proposed.
[0003]
5 and 6 are a plan view and a cross-sectional view of the speaker described in the abovementioned publication, respectively. In the figure, reference numeral 31 denotes an annular
magnet, 32 denotes an annular upper yoke, and 33 denotes a lower yoke provided with a pole
portion 33a that faces the inner circumferential surface of the upper yoke 32 to form a magnetic
gap. A magnetic circuit is constituted by the upper yoke 32 and the lower yoke 33. A voice coil
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34 is disposed in the magnetic gap, and a circular diaphragm 36 is connected to the voice coil 34
via a connecting portion 35. Further, the upper surface of the upper plate 32 and the outer
peripheral edge portion of the diaphragm 36 are connected by the elastic edge 37, whereby the
diaphragm 36 is supported in a freely vibrating manner.
[0004]
As shown in FIG. 5, a plurality of notch portions 33b extending in the vibration direction of the
diaphragm 36 are provided in the pole portion 33a of the lower yoke 33, and the connecting
portion 35 can enter into the notch portions 33b. There is. Then, by supplying an audio signal
(current) to the voice coil 34, the connecting portion 35 vibrates in the notch portion 33b,
whereby the diaphragm 36 has its vibration area within the dimension of the magnetic circuit in
the height direction. It vibrates in a state where some overlap.
[0005]
According to the above configuration, at least a part of the vibration area of the diaphragm 36
can be accommodated within the dimension in the height direction of the magnetic circuit, and
therefore, it is always separated above the magnetic circuit. The speaker can be made thinner
compared to one in which the diaphragm vibrates at the position shown. However, in the abovedescribed speaker, since a large number of notches 33b must be formed in the radial direction in
the cylindrical pole portion 33a of the lower yoke 33, there is a problem that a cutting process is
required and the processing cost increases. Further, in the case where a magnet is disposed
inside the voice coil 34 to construct a magnetic circuit called a so-called internal magnet type, in
order to make the connecting portion 35 enter the height dimension of the magnetic circuit,
There is a problem that the magnets must be cut at a predetermined angle, or a plurality of
magnets formed in an arc shape in advance be positioned so as to be generally cylindrical as a
whole, and the manufacturing cost further increases. The present condition is that it has not been
put to practical use.
[0006]
The present invention has been made in view of the above problems, and has as its main object
to provide a speaker which can be thinned without increasing the cost.
[0007]
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SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to
the present invention, there is provided a magnetic circuit having a magnet and a yoke, wherein a
magnetic gap is formed between a pair of opposing parts facing each other, and the magnetic
gap A plurality of air gap portions extending in the vibration direction of the diaphragm are
formed in at least one of the pair of facing portions, including a voice coil disposed in the inside
and a diaphragm connected to the voice coil. In the speaker in which the diaphragm and the
voice coil are connected via a connecting portion capable of entering into the portion, the voice
coil and the pair of opposing portions are respectively formed in a substantially rectangular
shape as viewed from the vibration direction. It is characterized in that the four corners of at
least one of the facing parts are separated to form the void.
[0008]
According to the above configuration, the pair of opposing portions forming the magnetic gap
are respectively formed in a rectangular shape, and the four corner portions of the opposing
portions are respectively separated, and the connecting portion connecting the diaphragm and
the voice coil enters As a result, a magnetic circuit can be configured by arranging linearly
extending magnetic circuit components in a substantially rectangular shape, and an expensive
component such as an arc-shaped magnet or the like can be formed. The need for cutting is
eliminated, and a speaker that can be thinned while suppressing cost increase can be provided.
[0009]
In the above-mentioned configuration, it is preferable that the diaphragm is formed in a
substantially tetragonal shape as viewed from the vibration direction, and the connecting
portions extend radially from four corners of the diaphragm.
With this configuration, the diaphragm can be disposed inside the rectangular magnetic circuit
without forming an unnecessary gap, so that the output sound pressure level does not decrease.
[0010]
In this configuration, there are provided a plurality of auxiliary connecting portions respectively
connecting the sides of the diaphragm and the voice coil, and at least one of the opposing
portions is formed with a slit through which the auxiliary connecting portion can enter. Is
preferred.
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According to this configuration, since the four corners of the rectangular voice coil can be
supported by the connecting portion and the straight portion of the voice coil can be supported
by the auxiliary connecting portion, the straight portion of the voice coil is the diaphragm It is
possible to prevent the occurrence of an obstacle such as the generation of noise or the like by
bending in the direction crossing the vibration direction and colliding with the magnetic gap
forming surface of the magnetic circuit.
[0011]
In each of the above configurations, it is preferable that a bobbin portion extending in the
vibration direction is integrally bent at the connection portion, and the voice coil is wound
around the bobbin portion.
According to this configuration, it is not necessary to provide a bobbin for winding the voice coil
separately from the connecting portion, so that the number of parts can be reduced.
[0012]
Furthermore, in each of the above configurations, preferably, the diaphragm is formed of a thin
metal plate, and the connection portion is integrally formed with the diaphragm. According to
this configuration, the connection operation between the connection portion and the diaphragm
is also unnecessary, and the manufacturing cost can be reduced.
[0013]
Further, in the above configuration, a cylindrical portion is provided at a central portion of the
diaphragm, and a pair of dampers movably supporting the cylindrical portion in the vibration
direction is disposed in a stacked state. Is preferred. With this configuration, even when a
substantially flat diaphragm is used, it is possible to prevent the occurrence of rolling of the
diaphragm.
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[0014]
Further, in the above configuration, a frame is formed in a substantially rectangular shape when
viewed from the vibration direction, and supports the outer peripheral edge portion of the
diaphragm via an elastic edge, and the voice coil is made of the frame An inclined portion is
formed at a position facing the corner, and a lead for transmitting an audio signal to the voice
coil is disposed in a space between the corner of the frame and the inclined portion of the voice
coil. Is preferred. According to this configuration, since the lead wire can be disposed utilizing the
space between the corner of the rectangular frame and the inclined portion formed in the portion
out of the magnetic gap of the voice coil, the overall size of the speaker can be reduced. Can be
implemented.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the speaker according to the
present invention will be described below with reference to the drawings. 1 is a plan view of the
speaker of the present invention, FIG. 2 is a sectional view taken along the line A-O-B of FIG. 1,
and FIG. 3 is a plan view of the speaker of the present invention with the elastic edge and part of
the frame removed. 4 is a cross-sectional view taken along the line C-C in FIG.
[0016]
In the figure, reference numeral 1 denotes a diaphragm formed in a substantially rectangular
shape from a thin metal plate such as aluminum. The central portion of the diaphragm 1 is a
spherical surface in which the sound emitting surface (upper surface in FIG. 2) side is recessed.
Also, spherical portions of small diameter are formed near the four corners of the diaphragm 1
respectively. Thereby, the rigidity to the deflection of the substantially planar diaphragm 1 is
enhanced. At four corners of the diaphragm 1, plate-like connecting portions 1a, 1a,... Extending
in the radial direction are integrally formed. Further, as shown in FIG. 3, at the central portion of
each of the four sides of the diaphragm 1, auxiliary connecting portions 1b, 1b,. As shown in
FIGS. 2 and 4, a bobbin portion 1c extending toward the Y-axis direction (the vibration direction
of the diaphragm 1) is integrally bent at the outer end of each connecting portion 1a, In addition,
the bobbins 1d are integrally formed at the outer end portions of the respective auxiliary
connection portions 1b.
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[0017]
And the voice coil 2 is wound around the outer surface of these bobbin parts 1c and 1d. The
voice coil 2 wound around the bobbins 1c and 1d is formed in a substantially rectangular shape
as a whole, and inclined portions 2a inclined at approximately 45 degrees with respect to each
side are provided at four corners thereof. As described above, the voice coil 2 has its four corners
supported by the bobbin portion 1c of the connecting portion 1a, and the center of the straight
portion between the pair of inclined portions 2a and 2a is the bobbin portion 1d of the auxiliary
connecting portion 1b. Since it is supported, a linear portion elongated between the inclined
portions 2a, 2a bends in a direction (direction of the paper surface in FIG. 3) orthogonal to the Yaxis direction to form the magnetic gap G of the magnetic circuit MC described later. It is
possible to prevent the occurrence of obstacles such as collisions.
[0018]
In the figure, reference numeral 3 denotes a yoke formed in a straight line having a U-shaped
cross section from a material of high magnetic permeability. A linearly extending plate-like
magnet (opposite portion) 4 is fixed to the inner surface of one erect wall portion 3a of the pair
of erect wall portions (opposite portions) 3a and 3b of the yoke 3 opposed to each other. A
magnetic gap G in which the magnetic flux converges is formed between the magnet 4 and the
other standing wall 3b. Although not particularly shown, the magnet 4 is magnetized such that
its outer surface side (the standing wall 3b side) is N pole and its inner surface side (the standing
wall 3a side) is S pole. Then, the magnetic circuit elements Me configured by one yoke 3 and one
magnet 4 are arranged linearly in two sets on the outer side of each side of the diaphragm 1, so
that they are viewed from the Y-axis direction. A generally rectangular magnetic circuit MC is
formed, and at the same time, the magnetic gap G is also formed substantially continuously in a
rectangular shape. However, the magnetic circuit elements Me are separated at portions
corresponding to the four corners of the diaphragm 1, and void portions Sp, Sp,... Into which the
connecting portions 1a, 1a,. . The magnetic circuit elements Me are also separated at positions
corresponding to the centers of the sides of the diaphragm 1, and slits Sl, Sl,... To which the
auxiliary connection portions 1b and 1b can be respectively formed are formed.
[0019]
Corner frames 5a, 5a, ... made of synthetic resin are disposed at locations corresponding to the
above-mentioned gaps Sp. Each corner frame 5a is L-shaped in a plan view and L-shaped in cross
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section, and the outer surface thereof is flush with the outer surface of the adjacent magnetic
circuit element Me, that is, the outer surface of the yoke 3. So are each arranged. Then, a
synthetic resin or an adhesive is filled in a gap between each corner frame 5a and the magnetic
circuit element Me adjacent thereto and a part between the magnetic circuit elements Me
adjacent to each other with the slits Sl interposed therebetween. Each corner frame 5a, 5a,... And
each magnetic circuit element Me, Me,... Are connected in a rectangular shape as viewed from the
Y-axis direction. An upper frame 5b having a rectangular flange shape is fixed to the corner
frames 5a, 5a, ... and the top surfaces of the magnetic circuit elements Me, Me, .... The corner
frame 5a, the magnetic circuit element Me (the standing wall portion of the yoke 3 A frame F is
constituted by 3b) and the upper frame 5b. In addition, when attaching the speaker of the
present invention to a mounting portion such as a door inner wall of a vehicle, through holes 5c,
5c,... It is set up.
[0020]
Here, as described above, since each magnetic circuit element Me (yoke 3) is also used as the
frame F, the overall size of the speaker can be reduced compared to the case where the frame is
separately provided outside the magnetic circuit MC. Can be The corner frame 5a can be
integrated with each magnetic circuit element Me by insert or outsert molding. Further, as shown
in FIG. 2, a bottom wall 6 made of synthetic resin is provided on the bottom surface of the frame
F, and this bottom wall 6 also integrates the corner frame 5a with each magnetic circuit element
Me by insert or outsert molding. It is also possible to form it simultaneously.
[0021]
Between the upper frame 5b and the outer peripheral edge of the diaphragm 1, an elastic edge 7
formed in a substantially rectangular shape from a foamable resin or a rubber material is
interposed, and the elastic edge 7 makes the diaphragm 1 a frame. It is supported vibratably with
respect to F. Further, a cylindrical portion 8 extending in the Y-axis direction is integrally
provided at the central portion of the back surface of the diaphragm 1, and between the outer
peripheral surface of the cylindrical portion 8 and the bottom wall 6, A pair of dampers 9 and 10
are arranged in a stacked state. The diaphragm 1 is supported by the dampers 9 and 10 so as to
vibrate linearly in the Y-axis direction. It is not necessary to provide a pair of dampers, and even
one damper can support the diaphragm 1 in the vibration direction. In this case, the inner
peripheral edge portion of the damper can be directly adhered and fixed to the central spherical
back side of the diaphragm 1 without providing the cylindrical portion 8. However, as described
above, the rolling phenomenon (inclination with respect to the Y-axis direction) of the diaphragm
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1 can be more reliably prevented by arranging the pair of dampers 9 and 10 in layers.
[0022]
In the gap between the corner frame 5a and the inclined portion 2a of the voice coil 2, lead wires
12 for transmitting an audio signal (current) from the external amplifier to the voice coil 2
through the terminals 11 and 11 are provided. It is arranged. Thus, the space efficiency is
improved by inclining the portion of the voice coil 2 out of the magnetic gap G to form a gap with
the frame F and arranging the lead wires 12 and 12 in the gap. The size of the entire speaker can
be reduced.
[0023]
In the speaker having the above configuration, when an audio signal is supplied to the voice coil
2 through the terminals 11 and 11 and the lead wires 12 and 12, the magnetic flux crossing the
voice coil 2 in the magnetic gap G flows in the voice coil 2. The voice coil 2 and the diaphragm 1
vibrate in the Y-axis direction by the electromagnetic force generated by the current. At this time,
the connecting portion 1a connecting the diaphragm 1 and the voice coil 2 enters the air gap Sp
formed at the corner of the magnetic circuit MC, and at the same time, the auxiliary connecting
portion 1b is also connected to each magnetic circuit element Me. Into the slit Sl between.
Therefore, the diaphragm 1 can move below the upper surfaces of the standing wall portions 3a
and 3b of the yoke 3 in FIG. 2, that is, the vibration area of the diaphragm 1 enters the height
dimension of the magnetic circuit MC. Thus, it is possible to make the entire speaker thinner
while maintaining the amplitude of the diaphragm 1 sufficiently.
[0024]
As described above, in the speaker of the present invention, the magnetic circuit element Me is
formed of the yoke 3 and the magnet 4 linearly extending, and the magnetic circuit element Me
is arranged in a substantially rectangular shape to arrange the magnetic circuit MC. Since it is
formed, it is not necessary to use an arc-shaped component as a yoke or a magnet as in the prior
art, and no cutting process is required, thus providing a thin speaker while reducing component
cost and manufacturing cost. be able to. Further, a so-called external-magnet-type magnetic
circuit can also be configured only by fixing the magnet 4 not to the inner wall 3a of the yoke 3
but to the outer wall 3b, or the magnets can be formed on the compatible walls 3a and 3b. It is
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also possible to fix 4 and the degree of freedom of design is greatly improved.
[0025]
In the above embodiment, at the corner of the magnetic circuit MC, the standing wall 3a and the
magnet 4 which are one opposing portion forming the magnetic gap G and the standing wall 3b
which is the other opposing portion are separated. In the configuration described above, even in
the case where the standing wall portions 3b located on the side far from the diaphragm 1 are
connected between the magnetic circuit elements Me, the gap Sp to which the connecting portion
1a of the diaphragm 1 enters is formed. It is possible to do. However, in this case, since it is
necessary to manufacture the yoke 3 by a manufacturing method such as die casting, a slight
cost increase can be expected compared to the speaker shown in the above embodiment.
However, the magnet 4 itself can be a plate-like or rod-like one that linearly extends, and the
manufacturing cost can be reduced as compared with the conventional product.
[0026]
Further, in the above embodiment, although the diaphragm 1 has been described to have a
substantially quadrilateral shape, for example, it is also possible to leave only the spherical
surface of the central portion of the diaphragm 1 to form a circular diaphragm. However, as
described above, when the substantially rectangular diaphragm 1 is used, unnecessary gaps are
not formed between the rectangular magnetic circuit MC and the inner peripheral portion of the
magnetic circuit MC, and the effective area of the diaphragm can be increased. It is possible to
improve the sound pressure level.
[0027]
As described above in detail, according to the speaker of the present invention, the pair of
opposing portions forming the magnetic gap is formed in a rectangular shape, and the four
corner portions of the opposing portions are respectively separated. Since a gap is formed to
allow the connection portion connecting the diaphragm and the voice coil to enter, a magnetic
circuit is configured by arranging linearly extending magnetic circuit components in a
substantially rectangular shape. This eliminates the need for expensive parts such as arc-shaped
magnets and cutting, and can provide a speaker that can be thinned while suppressing cost
increase.
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