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DESCRIPTION JP2000333294

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DESCRIPTION JP2000333294
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
improvement of an elliptic speaker, and more particularly to an elliptic speaker adapted to damp
a swing in the major axis direction of an elliptic diaphragm.
[0002]
2. Description of the Related Art Conventionally, elliptical speakers as shown in FIGS. 6 (A) and 6
(B) are widely used in vehicles and the like.
[0003]
6A and 6B generally show a plan view and a side cross-sectional view of an elliptical speaker, and
an external magnet type is shown below the substantially elliptical funnel-shaped frame 2. A
magnetic circuit is provided, and an elliptical cone-shaped diaphragm 3 has a dome-shaped cap 4
at a central position, and a drive system such as a voice coil including a voice coil bobbin is a
magnet of the magnetic circuit under the cap 4 It is pivotally attached to the diaphragm 3 so as
to be able to swing up and down in the gap.
[0004]
The outer periphery of the elliptical diaphragm 3 is pasted on the frame 2 by the gasket 5 via the
elliptical edge 6.
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[0005]
SUMMARY OF THE INVENTION When the major axis LD of the elliptical diaphragm 3 increases
from the central position O of the cap 4 provided at the central position of the elliptical
diaphragm 3 in the above-described elliptical speaker 1, the central position The separated
position 7 separated from the position of O by a predetermined distance does not correspond to
the amplitude of the drive system such as the voice coil provided at the center position, and in
the vibration of the diaphragm 3 or the vibration of the divided vibration region, a node or an
antinode appears on the diaphragm. As a result, as shown in the amplitude curve 8 of FIG. 6B, a
node or the like is generated at the separated position 7 to generate an unnecessary sound
different from the movement of the voice coil bobbin, thereby deteriorating the sound quality.
[0006]
The present invention has been made to solve the above-mentioned problem, and an object of the
present invention is to provide an elliptical speaker 1 capable of damping unnecessary "stray" of
the diaphragm 3 by effectively using a conventional magnetic circuit. It is
[0007]
A speaker according to the present invention moves to a predetermined position in the major
axis direction of an elliptical diaphragm driven by a drive system and moves opposite to the drive
direction of the elliptical vibration of the drive system. A braking means for braking is provided.
[0008]
According to the present invention, the unnecessary vibration generated in the major axis
direction of the elliptical diaphragm can be easily braked by utilizing the magnetic path of the
magnetic circuit and the voice coil of the drive system.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an elliptical speaker according to
the present invention will be described in detail with reference to FIGS.
1 (A) to 1 (C) are a plan view, a side sectional view and an enlarged view of a portion A of FIG. 1
(B) showing an embodiment of an elliptical speaker according to the present invention. The
corresponding parts are given the same reference numerals.
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[0010]
In FIGS. 1 (A) to 1 (C), the magnetic circuit of the elliptical speaker 1 of this example is
configured as a magnetic shield type, and the bottom of the cylindrical shield case 10 having a
bottom is for cancellation. In the thickness direction, for example, S.I. A first magnet 11
magnetized to N is joined, and a high permeability member comprising a cylindrical center pole
12 having a T-shaped cross section and a disk-like yoke 13 is joined on the first magnet 11 .
[0011]
A second magnet 14 serving as a main magnet is bonded onto the disk-shaped yoke 13 with an
adhesive or the like.
The second magnet 14 has, for example, N.V. It is magnetized as S and oppositely to the first
magnet 11.
[0012]
A disk-shaped plate 15 made of concentric high-permeability metal is joined onto the first
magnet 14, and the outer peripheral portion of the plate 15 is in contact with the cylindrical
inner diameter of the shield case 10.
[0013]
A frame 16 pressed with metal or the like in an oval shape and in a funnel shape is fixed on the
plate 15 by a rivet or the like to form a magnetic circuit.
[0014]
Cylindrical convex portions 17L and 17R are formed at positions opposite to the separation
position 7 which produces "slash" on the major axis of the elliptical diaphragm 3 of the inclined
portion of the funnel-shaped frame 16, and these convex portions 17L and 17R The drive coils
18L and 18R are wound as yokes, the input terminals 19L and 19R are disposed in the vicinity of
the convex portions 17L and 17R, and the tinsel wires 20L and 20R and the voice coil lead wires
28L and 28R (see FIG. 1A). ) Is connected to the beginning and end of winding of the voice coil
23 described later.
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[0015]
In order to pivotally attach the diaphragm 3 and the voice coil 23 constituting the drive system
to the above-mentioned magnetic circuit, the voice coil 23 is wound around the tip of the
cylindrical voice coil bobbin 22 and the inner diameter of the plate 15 and the outside of the
center pole 12 The voice coil bobbin 22 is inserted through the spacer guide into the magnetic
gap 21 formed between the spans, and the inner diameter of the concentric wave damper 24 is
attached to the upper outer diameter of the voice coil bobbin 22. The portion is fixed to the
bottom of the frame 16 and the voice coil bobbin 22 including the voice coil 23 is pivotally
pivotally mounted in the magnetic gap 21 in the vertical direction.
[0016]
Further, a through hole formed in the center of the diaphragm 3 formed in an elliptical cone
shape is inserted and joined to the upper end of the voice coil bobbin 22, and an outer peripheral
portion of the diaphragm 3 has an oval dome cross section. The edge 6 is pasted, and the outer
periphery of the edge 6 is pasted on the maximum long and short diameter of the frame 16
through the elliptical gasket 5 to constitute the elliptical speaker 1.
[0017]
For example, a circular recess 25 (see FIG. 1 (see FIG. 1) is used to attach disc-shaped small
magnets 26L and 26R to the separated position 7 which is produced by "divergence" during
driving on the major axis of the elliptical diaphragm 3 of this example. C) (see C), and disc-like
small magnets 26L and 26R are inserted into the recess 25 so as to be joined to the diaphragm 3.
The small magnets 26L and 26R are, for example, N.V. When the drive coils 18L and 18R are
supplied with acoustic signals, the convex portions 17L and 17R constituting the yoke become S
poles, and the lower S pole of the small magnets 26L and 26R And have the same polarity, and
are configured to generate repulsive force.
Of course, the magnets 26L and 26R should be small and light so as not to increase the
equivalent mass of the diaphragm 3.
Therefore, since the mass of the swaying portion of the diaphragm 3 is small, it is about 1/100
or less of the drive amplitude of the drive system.
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[0018]
The operation of the elliptical speaker having the above configuration will be described. When a
positive signal of an acoustic signal is supplied to the input terminal 19L and a negative signal is
supplied to the input terminal 17R, the drive coil 18L, the voice coil 23, and the drive coil 18R
are connected. Are mutually connected in series to the acoustic signal source.
[0019]
Therefore, when acoustic signals are supplied to the drive coils 18L and 18R, the convex portions
17L and 17R serving as yokes become, for example, S-poles, and the S-poles of the magnets 26L
and 26R attached to the concave portion 25 of the diaphragm 3 Reciprocate each other to move
the separating position 7 of the diaphragm 3 upward, and as shown in FIG. 6 (B), to move the
deformation of the lower node portion caused by the vibration of the diaphragm 3 at the time of
driving. Can work as well.
[0020]
According to the above-mentioned configuration, there is no difficulty in manufacturing only by
adding the small magnets 26L and 26R and the two drive coils 18L and 18R wound on the
frame, which occurs in the diaphragm 3 of the elliptical speaker 1 The shaking can be reduced
and a clear sound can be reproduced.
[0021]
FIGS. 2A, 2B and 3 show other embodiments of the elliptical speaker and magnetic circuit of the
present invention.
[0022]
2A and 2B are a plan view and a side sectional view showing another configuration of a magnetic
circuit suitable for the speaker of this example, and FIGS. 3A and 3B are suitably used for the
speaker of this example. FIG. 16 is a plan view and a side sectional view showing still another
configuration of the magnetic circuit.
[0023]
2 (A) and 2 (B) are not the magnetic shield type as in FIGS. 1 (A) to 1 (C), but the magnetic path
using a normal external magnetic type magnetic circuit is improved to make the air gap for
braking It was made to form.
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[0024]
In FIGS. 2A and 2B, the yoke 13a has a bottom portion 13b formed of a substantially square
plate material, left and right yoke portions 13L and 13R extended upward at the left and right
ends of the bottom portion 13b of the yoke, and the left and right yokes. Protruding yokes 13c
and 13d are formed on the upper portions of the portions 13L and 13R so as to form the braking
magnetic gaps 27L and 27R.
Furthermore, a cylindrical center pole 12 is erected integrally with the bottom 13b at the center
position of the bottom 13b.
[0025]
In the bottom portion 13b of such a yoke 13a, N.N. S and the magnet 14 magnetized are bonded
to be concentric with the center pole 12 via an adhesive or the like, and the plate 15a is bonded
on the magnet 14 so as to form a predetermined magnetic gap 21.
[0026]
In the plate 15a, a through hole 15b is formed at the center of an elliptical high permeability
metal plate, and the center pole 12 is inserted into the through hole 15b to form a magnetic gap
21. The magnetic gap 21 is formed. A voice coil or the like that constitutes a drive unit of a
normal vibration system is pivotally attached to the inside.
[0027]
The braking magnetic gaps 27L and 27R are formed between the left and right arms 15L and
15R which are inclined upward from the left and right ends of the rectangular plate 15a and the
protruding yokes 13c and 13d.
[0028]
A braking coil such as an aluminum plate which can be rocked by the diaphragm 3 is interposed
between the above-described braking magnetic gaps 27L and 27R, which will be described later.
[0029]
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FIGS. 3A and 3B show still another magnetic circuit of this embodiment.
The same reference numerals are given to portions corresponding to the magnetic circuits shown
in FIG. 2 (A) and FIG. 2 (B) and duplicate explanations are omitted.
[0030]
In the configuration of FIGS. 3A and 3B, the yoke 13 disposed below the magnet 14 is formed as
a disk-like portion similar to that described in FIG. 1A, and the center of the disk-like portion is
formed. A cylindrical center pole 12 is erected on the bottom of the discoid portion, and a
cylindrical yoke cover 30 with a bottom is disposed on the lower surface of the discoid portion,
and the plate 15a is formed in a disk shape instead of a square shape. There is.
[0031]
At the left and right ends of the yoke-cum-cover 30 are cover arms 31L and 31R which are bent
at right angles to the left and right from the upper end of the cylindrical yoke-cum-cover 30 and
further bent upward at the upper end extending upward to form projecting yokes. A braking coil
formed of an aluminum plate or the like as a braking member is inserted between the projecting
yokes of the cover arms 31L and 31R and the braking magnetic gaps 27L and 27R formed
between the left and right arms 15L and 15R of the plate 15a. .
[0032]
4 (A) and 4 (B) show a plan view of the braking coil 33 as a braking member and sectional views
taken along arrows AA 'and B-B', and the braking coil 33 has a width of 5 mm. An aluminum
plate having a thickness of about 0.3 mm is formed in a strip shape, and a rectangular punched
portion 34 is formed on the upper side of the strip-shaped aluminum plate to form a one-tan coil.
A wide portion 33a formed on the lower side of the punched portion 34 of the braking coil 33
shows a portion to be inserted into the braking magnetic gaps 27L and 27R.
In the case of FIG. 4B, a glue margin 33b along the inclination of the diaphragm 3 is formed on
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the upper side of the strip portion.
If such a braking coil 33 is swung up and down in the braking magnetic gaps 27L and 27R, a
short current IS as shown in FIG. 4 (A) and FIG. 4 (B) flows in the braking coil 33. Can.
[0033]
FIG. 5 shows a side sectional view of a speaker using the magnetic circuit described in FIG. 2A
and FIG. 2B. The parts corresponding to the speaker described in FIG. Therefore, duplicate
explanations are omitted.
[0034]
In FIG. 5, the frame 16 is mounted on the left and right yokes 13L and 13R, and produces a
"glaring" due to a swing on the major diameter of the elliptical diaphragm 3 facing the braking
magnetic gaps 27L and 27R of the magnetic circuit The braking coil 33 is attached to the joint,
and the wide portion 33a of the braking coil 33 is pivotally pivoted in the braking magnetic gaps
27L and 27R in the vertical direction.
[0035]
When an acoustic signal is supplied to the input terminal 19 by the above-mentioned speaker,
the diaphragm 3 is vertically driven by the acoustic signal supplied to the voice coil 23 through
the tinsel wire 20.
At this time, assuming that the separation position 7 in the major axis direction of the elliptical
diaphragm 3 is pressed upward at the center position of the elliptical diaphragm 3, the
diaphragm 3 is pushed downward, for example, by the vibration of the diaphragm 3.
Therefore, in order to cut the magnetic flux from the N pole to the S pole in the braking magnetic
gaps 27L and 27R, the wide portion 33a of the braking coil 33 causes the braking coil to cut the
magnetic flux according to the right-hand rule of framing. Occurs.
The force caused by such electromagnetic induction acts as a force that pushes up the diaphragm
3 and acts as a force that brakes or cancels the force that pushes it downwards, so the motion at
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the inflection point of the node or the diaphragm is reversed. It is possible to make correction so
as to push back.
[0036]
In FIG. 5, the speaker using one normal second magnet 14 has been described, but as described
in FIG. 1 (B), the first magnet for cancellation is located between the lower side of the yoke 13
and the bottom 13B of the yoke 13a. It is also possible to make a magnetic shield type by adding
11.
In this case, since the magnetic flux density of the braking magnetic gaps 27L and 27R depends
on the magnetic flux of the first magnet 11 for cancellation, it becomes about 1000 gauss, but
such is used to drive the braking coil 33. Even the configuration is sufficiently available.
[0037]
According to the speaker of the present invention, in the speaker having the long diaphragm in
the long diameter direction as narrow as the elliptical speaker, the vibration in the long diameter
direction different from the movement of the diaphragm center of the voice coil portion
Unwanted movement of the board can be damped or canceled with a simple magnetic circuit, and
clear sound can be reproduced to improve sound quality.
Also, since the braking means effectively uses the conventional magnetic circuit to form the
magnetic gap for braking, it has an effect that a simple and easy-to-assemble speaker can be
obtained.
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