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JP2001128288

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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
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DESCRIPTION JP2001128288
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in various audio equipment and video equipment.
[0002]
2. Description of the Related Art In recent years, the market demand for smaller and thinner
speakers has been extremely increasing. However, on the other hand, high efficiency, high input
resistance, deep bass reproduction, and low magnetic leakage are required, and in order to
satisfy these contradictory requirements, a small, thin, large-amplitude speaker is possible. It will
be essential.
[0003]
Here, a conventional speaker will be described with reference to a cross-sectional view in the
major axis direction of a slim speaker that is often used for the image in FIG. According to the
figure, the two rectangular parallelepiped main magnets 1 are sandwiched by the lower plate 4
having the upper plate 2 and the center pole 3, and the rectangular parallelepiped two sub
magnets 5 and the shield cover 6 are coupled to the back of the lower plate 4. The frame 8 is
coupled to the top plate 2 of the magnetic circuit 7 of the magnetic shielding type configured as
described above, the diaphragm 9 is bonded to the peripheral portion of the frame 8, and the
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middle of the voice coil 10 for driving the diaphragm 9 The part is center-held by the damper 11
and coupled so as to be fitted into the magnetic gap 12, and the dust cap 13 is adhered to the
surface of the joint of the diaphragm 9 with the voice coil 10.
[0004]
However, the height of the magnetic circuit of the above-mentioned speaker is determined by the
thickness of the main magnet 1, and for this reason, the height of the center pole 3 of the lower
plate 4 is naturally high in accordance with the main magnet 1 as well. (The height of the center
pole 3 must be one that allows the downward movement of the voice coil 10. However, since the
thickness of the main magnet 1 is significantly larger than this, it is determined by the thickness
of the main magnet 1. ), The magnetic circuit 7 is enlarged, and the conventional magnetic circuit
7 having the above-mentioned sub-magnet 5 is further enlarged, so that it is thin in order to meet
the requirements for high efficiency, deep bass reproduction and high input resistance. It was
difficult to realize the market demand for
[0005]
The present invention solves the above-mentioned problems, and is intended to provide a high
efficiency, deep bass reproduction, and a high input resistant speaker in a thin configuration.
[0006]
SUMMARY OF THE INVENTION In order to solve the above problems, the loudspeaker of the
present invention has at least a center pole and a lower plate which is inclined upward and has a
flat portion near the end, and is coupled to the flat portion. A magnetic circuit is formed by
forming the magnetic gap between the above-mentioned magnet and the above center pole,
tilting upward and making the vicinity of the end a flat part, and the top plate below which this
magnet is coupled. The frame is connected to the circuit, the outer peripheral part is connected
to the peripheral part of the frame, and the inner peripheral part is constituted by the diaphragm
coupled to the voice coil inserted into the magnetic gap. It is inclined upward to reduce the space
at the bottom of the frame for use in the magnetic circuit, and the height of the center pole is
Only setting higher than the downward movement limit of the time of driving, and makes it
possible to provide a speaker which attained the thinner it is not necessary to consider the size
(thickness) of the magnet.
[0007]
According to a first aspect of the present invention, there is provided a lower plate having at least
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2
a center pole and inclined upward and having a flat portion in the vicinity of an end, and a
magnet coupled onto the flat portion. A magnetic circuit is formed by forming a magnetic gap
between the center pole and tilting upward and forming a flat portion near the end and a top
plate below the flat portion to which the magnet is coupled. The top plate and the lower plate are
inclined upward because they are combined with each other and the outer peripheral portion is
connected to the peripheral portion of the frame and the inner peripheral portion is constituted
by the diaphragm coupled to the voice coil inserted into the magnetic gap. The space at the
bottom of the frame can be reduced for use in the magnetic circuit, and the height of the center
pole can be voice coiled without considering the thickness of the magnet. Since it only set higher
than the downward movement limit in which it is possible to provide a loudspeaker attained is
thinner.
[0008]
According to the second aspect of the present invention, a magnetic gap is formed between the
center pole and the lower plate having at least the center pole and inclined upward, the magnet
coupled to the inclined portion, and the center pole. A magnetic circuit is formed by the top plate
to which the magnet is coupled below the inclined portion, the frame is coupled to the magnetic
circuit, the outer circumferential portion is coupled to the peripheral edge of the frame, and the
inner circumferential portion is coupled to the magnetic gap Since the diaphragm is connected to
the voice coil to be inserted, the magnet is connected to the inclined portion, and the height of
the center pole is set higher than the lower limit of movement of the voice coil as in the first
aspect. It is possible to provide a speaker that can be thinned because it is good.
[0009]
The invention according to claim 3 of the present invention is, in addition to the configuration
according to claim 1 or claim 2, coupled to the lower side of the lower plate corresponding to the
magnet, the lower end being at least substantially flush with the bottom surface of the lower
plate. And a sub-magnet set so as to be the same as or higher than this, and it is possible to
provide a thin magnetic-shielded speaker.
[0010]
Hereinafter, an embodiment of a speaker according to the present invention will be described
with reference to FIGS. 1 to 5.
[0011]
(First Embodiment) FIG. 1 is a side cross-sectional view of the long diameter side of a thin
speaker according to one embodiment, and FIG. 2 is an exploded perspective view of the same.
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[0012]
According to the figure, reference numeral 21 denotes a pair of rectangular parallelepiped main
magnets, 24 a center pole 24c, a flat portion 24b having an inclined portion 24a inclined upward
and having the outer periphery coupled to the main magnet 21 at its outer periphery Is a lower
plate on which the magnetic gap 23 is formed with the center pole 24c, and has an inclined
portion 22a inclined upward, and a flat portion connecting the main magnet 21 to the lower
portion on the outer periphery thereof. A top plate 22b is formed, 25 is a pair of rectangular submagnets joined below the flat portion 24b of the lower plate 24, and 26 is the main magnet 21,
the lower plate 24, and the top A seal coupled to cover a magnetic circuit formed by the plate 22
and the sub magnet 25 A cover, the magnetic circuit 27 of the magnetic shielding these is
constructed.
[0013]
A frame 28 is connected to the top plate 22. A diaphragm 29 has an outer periphery coupled to
the periphery of the frame 28. An inner periphery of the diaphragm 29 is connected to the voice
coil 30.
[0014]
A damper 31 has an outer periphery coupled to the frame 28, an inner periphery coupled to a
substantially middle portion of the voice coil 30, and a lower portion of the voice coil 30 inserted
into the magnetic gap 23 of the magnetic circuit 27 of the magnetic shield type. It can be moved
up and down.
[0015]
As described above, the height h of the center pole 24c of the lower plate 24 is taken into
consideration of the thickness of the main magnet 21 by moving the main magnet 21 to the
upper side of the frame 28 by inclining the top plate 22 upward. Since it is only necessary to set
the height so as to allow the downward movement limit of the voice coil 30 without making the
speaker thinner, the present embodiment is a speaker using the magnetic circuit 27 of the
magnetic shielding type, so The bottom surface position is also substantially the same as the
bottom surface position of the lower plate 24 to make the entire speaker thinner.
[0016]
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4
Second Embodiment Another embodiment of the present invention will be described with
reference to the side sectional view on the long diameter side of the narrow speaker of FIG. 3 and
the exploded perspective view of FIG.
In the description, the same parts as in the first embodiment will be assigned the same reference
numerals and explanations thereof will be omitted.
[0017]
35 is a lower plate having an upward inclined portion 35a, 36 is a top plate having an upward
inclined portion 36a, 37 is above the inclined portion 35a, and is mounted below the inclined
portion 36a Reference numeral 38 denotes a sub magnet mounted below the inclined portion
35a.
[0018]
As described above, since the main magnet 37 and the sub magnet 38 are provided below the
inclined portions 36a and 35a, the shapes of the top plate 36 and the lower plate 35 can be
simplified to reduce the processing cost and further reduce the thickness. It is.
[0019]
FIG. 5 is a development example of the embodiment of FIG. 3, and the difference from the
embodiment of FIG. 3 is that a shield cover 39 coupled to the sub magnet 38 and the top plate
36 is provided. It is possible to provide a thin magnetic-shielded magnetic circuit and a speaker
with improved.
[0020]
In the above embodiment, although the explanation has been made with the elongated speaker,
the present invention is not limited to this, and it is composed of a magnetic circuit consisting of
a donut shaped magnet, a donut shaped top plate and a round lower plate Can also be used in a
magnetic circuit formed of a speaker, an outer diameter square type / inner diameter round hole
magnet and a plate corresponding thereto.
[0021]
In each of the above-described embodiments, the speaker using the magnetic circuit of the
magnetic shielding type has been described, but in the speaker using the conventional magnetic
circuit of the non magnetic shielding type, the height of the center pole of the lower plate is
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lower than the voice coil. As described above, it is possible to provide a thin speaker because it is
only necessary to have a height sufficient to prevent contact with the bottom due to movement.
[0022]
As described above, since the top plate and the lower plate can be inclined upward and the space
at the bottom of the frame can be reduced for use in the magnetic circuit, it can contribute to the
thinning of the speaker.
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