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JPH08289385

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH08289385
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
coaxial two-way speaker, and more particularly to an improvement of a speaker for magnetic
shielding.
[0002]
2. Description of the Related Art Conventionally, a two-way speaker as disclosed in Japanese
Utility Model Application Laid-Open No. 59-104694 is known as a coaxial speaker having a lowmid-tone speaker and a high-tone speaker. This speaker uses a first magnet used for the
magnetic circuit (hereinafter referred to as a first magnetic circuit) of a low / medium sound
speaker and a second magnet for canceling to reduce the leakage flux of the speaker etc. It is
configured.
[0003]
The configuration of the two-way speaker disclosed in this publication will be briefly described
with reference to FIG. In the figure, reference numeral 1 generally indicates a low-mid-tone and
high-tone coaxial type two-way speaker, and 2 is a lower plate, which is formed substantially in a
disk shape with a plate material. A second magnet 8 is formed in a ring shape of ferrite or the
like, and a flange portion 6B of a bottomed cylindrical yoke 6 having a cylindrical portion 6A and
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a flange portion 6B is placed on the upper surface of the second magnet 8 . One end of a
cylindrical portion 6A of the yoke 6 is a closed bottom (upper end) 6C, and a center hole 6D is
formed at the center of the bottom 6C. The other of the cylindrical portion 6A is formed into an
outwardly extending annular flange portion 6B, and the upper surface of the flange portion 6B is
in contact with the bottom surface of the first magnet 3 having substantially the same structure
as the second magnet. The lower surface of the portion 6B is in contact with the upper surface of
the second magnet 8. The second magnet is disposed to be placed on the lower plate 2.
Furthermore, a center pole 7 planted at the center position of the lower plate 2 is inserted into a
center hole 6D bored in the bottom 6C of the yoke 6 through a predetermined gap. Further, an
upper plate 4 made of pure iron or the like having a central hole 5 is fixed to the upper surface
of the first magnet 3.
[0004]
Accordingly, the outer periphery of the cylindrical portion 6A of the yoke 6, the upper plate 4
and the first magnet constitute a first magnetic circuit, and the cylindrical yoke 6 with a flange
portion 6B, the lower plate 2, the center pole 7 and The second magnet 8 constitutes a second
magnetic circuit. Reference numeral 9 denotes a cylindrical casing for integrating the first and
second magnetic circuits and functions as a shield cover for magnetic shielding. Further, by
magnetizing the first and second magnets 3 and 8 formed in a ring shape up and down so as to
be opposite to N, S and S, N, the magnetic flux of the first magnet is shielded by the shield cover
9 It is designed to avoid leakage through the circumference of the
[0005]
The voice coil 12 for low-medium noise and the voice coil 13 for high-pitched sound can be
vertically moved in the first gap 10 constituting the first magnetic circuit and the second gap 11
constituting the second magnetic circuit. The low mid-tone cone 18 and the high-tone cone 19
are disposed between the frames 16 and 17 and the low-mid tone voice coil 12 and the high-tone
voice coil 13 by the dampers 14 and 15, respectively. Coaxial type 2 way speaker is configured.
[0006]
In the configuration of the coaxial two-way speaker described in the above-described
conventional configuration, the ring-shaped second magnet 8 is superimposed on the lower end
of the flange portion 6B via the lower plate 2 and for the casing The shield cover 9 had to shield
the leakage flux from the first and second magnetic circuits.
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Therefore, the height H of the shield cover 5 surrounding the first and second magnetic circuits
is increased by at least the thickness of the lower plate 2 as compared with the present invention,
and there is a problem that the entire speaker becomes large.
[0007]
The present invention provides a speaker that solves the problems of overhead, and the object of
the present invention is to make the second magnetic circuit double as a shield cover for a casing
and to use a simple structure without using a lower plate. It is an object of the present invention
to provide a coaxial type two-way speaker which is reduced in size as a whole by reducing the
height H of the shield cover constituting the magnetic circuit.
[0008]
SUMMARY OF THE INVENTION The speaker according to the present invention is a speaker
having a hollow center pole, a cancel magnet and a shield cover, as an example of which is shown
in FIG. 1 and FIG. The hollow of the second magnetic path including the cancellation magnet and
the voice coil for low (medium) sound disposed in the gap formed between the hollow center pole
of the magnetic path for the low (medium) sound and the plate And a voice coil for high-pitched
voice disposed between gaps formed between magnetic paths including the center pole and the
shield cover.
[0009]
In the present invention, since the lower plate constituting the second magnetic circuit is also
used as the shield cover for magnetic shield, the coaxial two-way speaker for magnetic shield can
be miniaturized.
[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A loudspeaker according to the
present invention will be described in detail with reference to FIGS.
The parts corresponding to those in FIG. 5 are denoted by the same reference numerals.
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FIG. 1 is a side sectional view of a coaxial two-way speaker showing one embodiment of the
present invention, a side sectional view of a coaxial two-way speaker showing another
embodiment of the present invention in FIG. FIG. 4A to FIG. 4C are explanatory views of the
assembling order of the high sound speaker of this embodiment.
First, referring to FIG. 1, the overall configuration of the speaker of this example will be described
in correspondence with the assembly order. In this embodiment, the coaxial type two-way
speaker 1 is constituted by a low frequency speaker or a low / medium sound speaker
(hereinafter referred to as woofer) 20 and a high sound speaker (hereinafter referred to as
tweeter) 30. The magnetic circuit of the woofer 20 of this embodiment is configured to reduce
external leakage flux using a cancel magnet 8 and to be shielded magnetically.
[0011]
In FIG. 1, a through hole is bored at the center position of a substantially disk-like metal yoke 6
to weld a hollow center pole (cylindrical portion) 5, or the yoke 6 and hollow center pole 5 are
integrated to have a convex cross section. It is formed to be An adhesive is applied to the upper
surface of the yoke 6, and the inner diameter of the concentrically molded magnet 3 is inserted
through the center pole 5. In the lower hollow portion of the center pole 5 used in the present
embodiment, a step 5A including a counterbore is formed. A horn throat 58 having a tapered
guide hole is joined to the upper side of the center pole.
[0012]
In the above-described procedure, a magnet guide having an inner diameter that matches the
outer diameter of the center pole 5 and a flange having a flange that matches the inner diameter
of the magnet 3 at the lower end is inserted into the center pole 6A. The outer diameter of the
flange portion is adjusted to the inner diameter of the magnet 3 and the magnet 3 is fixed so as
not to be eccentric to the center position of the yoke 6.
[0013]
Next, the magnet guide is taken and the gap guide is placed on the upper opening of the center
pole 5.
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The gap guide is a guide whose outer diameter is selected to be equal to the diameter of the
central hole 4a bored in the plate 4 and for defining the width of the magnetic gap formed
between the outer diameter of the center pole 5 and the central hole 4a of the plate 4 The center
hole 4a drilled in the metallic disk-shaped plate 4 is fitted to the outer diameter portion of the
gap guide, and the plate 4 is placed and fixed on the adhesive applied to the upper surface of the
magnet 3.
[0014]
Next, with the plate 4 dried and the magnet 3 fixed, the gap guide is removed, and the funnel-like
metallic frame 16 is crimped and fixed onto the plate 4 with a screw or a rivet. An input terminal
31A for voice signal input to the voice coil 12 is attached to the frame 16 via an insulating
material 32A.
[0015]
This completes the body portion of the speaker. Next, a voice coil spacer is prepared. The outer
diameter of the voice coil spacer is selected to be equal to the inner diameter of the bobbin
around which the voice coil is wound, and the outer diameter is selected to be smaller than the
diameter of the center hole 4a of the plate 4, and the concentric center of the voice coil 12 and
the center pole 5 It is a jig for picking up, and is put over the upper end opening of the center
pole 5. Next, the voice coil 12 wound with a coil on the bobbin is inserted into the voice coil
spacer, and the voice coil 12 is positioned so as to be at a predetermined position in the gap
between the center pole 5 and the plate 4.
[0016]
Next, the center hole of the corrugated damper 14 having a center hole such as cloth or rubber is
inserted into the bobbin of the voice coil 12 and bonded with an adhesive or the like, and the
outer peripheral portion of the damper 14 is adhered to the frame 16. Hold the voice coil 12 on
the frame 16.
[0017]
Further, the inner diameter of the funnel-like cone 18 having the edge 33 formed thereon is
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attached to the upper portion of the bobbin of the voice coil 12 and the outer periphery of the
cone 18 is attached to the outer periphery of the frame 16 via the arrow 34. Bond to
After drying, the voice coil spacer is removed, and a breathable dome-shaped cap 35 such as
cloth or metal is attached to the upper inside diameter of the cone 12.
[0018]
Next, after connecting the tinsel wire 36 drawn out from the voice coil 12 to the input terminal
31A, the magnet 3 is magnetized so that the upper side of the magnet 3 is an N pole and the
lower side is an S pole.
[0019]
Next, the shield cover 9 is prepared.
In the shield cover, as shown in FIG. 1, the center pole 7 of the high sound speaker 30 is erected
at the center of the cylindrically drawn metallic bottom which is open at the top and the center of
the cancel magnet 37 is centered. A convex portion or a cut-and-raised piece 38 is formed.
[0020]
The center pole 7 is screwed to the central position of the shield cover 9 by a screw or the like.
An input terminal 31B for voice input to the tweeter 30 is attached to the bottom of the shield
cover 9 via an insulating material 32B.
[0021]
An adhesive is applied to the inner surface of the shield cover 9 so that the center hole of the
concentric cancel magnet 8 is aligned with the projecting portion or the cut-and-raised piece 38
and attached to the inner surface of the shield cover 9. The cancel magnet 8 fixed to the shield
cover 9 in this manner is oppositely magnetized to the S pole at the upper side and the N pole at
the lower side, contrary to the magnet 3 for the above-mentioned woofer.
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[0022]
Next, the diaphragm 40 is prepared. The diaphragm 40 comprises a dome portion 40a, a voice
coil formed at the lower end of the dome portion 40a, an edge portion 40b, and a diaphragm ring
41 attached to the outer periphery of the edge portion 40b. An assembled version of such a
tweeter diaphragm 40 is placed on a guide plate 39 which functions as a positioning and
diaphragm holding member.
[0023]
The above-mentioned positioning guide plate is made of a non-metallic member and comprises a
small diameter portion fitted to the step 5A of the counterbore formed at the lower end of the
center pole 5 and a flange portion having a large diameter portion abutting on the lower surface
of the yoke 6 A side cross section is formed in a substantially convex shape, and a through hole
39a having an inner diameter 3 fitted to the diameter of the center pole 7 for the tweeter 30 is
bored at the center.
[0024]
Next, the small diameter portion of the guide plate of the tweeter 30 placed on the guide plate 39
is inserted into the step 5A of the center pole 5 and bonded with an adhesive so that the lead of
the voice coil 47 is input to the input terminal 31. Connect and put.
[0025]
Next, an adhesive is applied to the upper side of the cancel magnet 8 and the center pole 7
erected at the center of the shield cover 9 is inserted into the through hole 39a drilled at the
center of the guide plate 39. Stick the top of the and dry it.
A magnetic circuit gap for the second tweeter is automatically configured between the inner
diameter of the center pole 5 and the outer diameter of the center pole 7 in such an insertion
process, and the tweeter 30 is magnetically shielded and has a cancel magnet. Is completed.
[0026]
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A low-tone signal is input to the input terminal 31A of the woofer 20 of the coaxial two-way
speaker configured as described above, and a high-tone signal is input to the input terminal 31B
of the tweeter 30, and a simple coaxial two-way speaker is obtained. By changing the horn throat
58 for the tweeter 30, it is possible to freely change the aperture ratio of the high sound.
[0027]
The magnetic flux density for the above-mentioned woofer is 9,000 gauss with a voice coil inner
diameter 20.32 mm, gap width 0.92 mm, and the magnetic flux density for a tweeter is 8,500
gauss with a voice coil inner diameter 16.25 mm, gap width 0.9 mm. The
The magnetic flux density for the tweeter was able to obtain high magnetic flux density as
described above by increasing the part accuracy and narrowing the gap width.
[0028]
In the configuration described above, it is possible to simplify the filter circuit by inputting the
full band signal to the woofer speaker and supplying the high band signal to the tweeter to
superimpose the high band.
[0029]
FIGS. 2 to 4 show a coaxial two-way speaker according to another embodiment of the present
invention. Corresponding parts to those in FIG.
[0030]
In this example, the center pole 5 of the woofer 20 and the center pole 7 of the tweeter 30 are
used in common, and the horn throat 58 and the equalizer of the tweeter 30 are integrated.
Of course, the cancel magnet is effectively used, and the bottom plate of the shield cover is also
configured as a yoke (or a plate).
[0031]
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8
Hereinafter, only differences from the configuration of FIG. 1 will be described with reference to
FIGS. 2 to 4.
First, a configuration for assembling the hollow center pole 5 for both the woofer 20 and the
tweeter 30 into the yoke 6 is shown in FIG.
[0032]
In FIG. 3, reference numeral 61 denotes an assembly jig, the side cross section of which is formed
in a substantially concave shape, and a first step 61A and a second step 61B are formed on the
upper part of the jig.
The inner diameter of the first step 61A corresponds to the outer diameter of the plate 6 and the
height corresponds to the thickness. The inner diameter of the second step 61B is selected to be
the outer diameter of the magnet 3, and the depth D of the recess is selected to be the sum of the
thickness of the cancel magnet 8 and the thickness of the shield cover 9.
[0033]
The yoke 6 having the concentric through holes 6A is placed on the first step 61A of such an
assembly jig 61. Next, an adhesive is applied to approximately the center of the outer diameter of
the hollow cylindrical center pole 5 and inserted into the through hole 6A of the yoke 6 to press
the lower end of the center pole 5 against the bottom of the recess of the assembly jig 61 Press
down until hit. Next, an adhesive is applied to the upper surface of the yoke 6, and the magnet 3
is positioned by fitting the magnet 3 to the inner diameter of the second step 61B. An adhesive is
applied to the upper surface of the magnet 3 and the plate 4 is placed.
[0034]
At this time, as described in FIG. 1, the gap guide 62 having a convex side cross section is fitted
to the outer diameter of the center pole 5 and the outer diameter of the large diameter portion is
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the center hole 4a of the plate 4 as shown in FIG. After drying, the gap guide 62 is removed. A
voice coil spacer is inserted between the outer periphery of the center pole 5 and the inner
diameter of the voice coil 12 so that the inner periphery of the voice coil 12 and the outer
periphery of the center pole 5 are concentric and located at a suitable position for the voice coil.
Are fixed by the damper 14. The attachment of the frame 16, the cone 18, the gap 35, etc. is
performed in the same manner as in FIG. After the magnet 3 is magnetized, the assembly jig 61
of FIG. 3 is removed.
[0035]
In addition, a concentric cancel magnet 8 is fixed to the inside of the shield case 9 in which a
through hole 9a larger than the outer diameter of the center pole 5 is formed in the center in
advance via an adhesive or the like. Magnetize in the direction.
[0036]
Next, insert the gap guide on the upper side (lower side in FIG. 2) of the center pole 5 with the
frame 16 of the speaker 1 downward, and apply the adhesive to the lower surface of the yoke 6
to make the through holes 9a of the shield cover 9 The shield cover 9 to which the cancel
magnet 8 is fixed in advance is joined to the yoke 6 while being inserted into the outer diameter
of the gap guide.
[0037]
A horn throat 58 having a tapered guide hole 28 for tweeter is inserted into the hollow of the
center pole 5 thus assembled from the lower side in FIG.
Next, the voice coil 47 for the tweeter 30 may be inserted between the center pole 5 and the
through hole 9 a of the shield cover 9.
[0038]
Hereinafter, an assembling procedure of the diaphragm 40 for the tweeter 30 will be described
with reference to FIG.
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First, the diaphragm 40 for the tweeter 30 is prepared. The diaphragm 40 is composed of a dome
portion 40a in which a thin metal plate or the like is formed in a dome shape, and an edge
portion 40b consisting of a convex portion concentrically formed on the dome portion 40a. A
ring-shaped diaphragm ring 41 is attached to the outer peripheral portion of the edge portion 40
b of the diaphragm 40 to make the buffer material acceptable.
[0039]
Such a diaphragm 40 is placed on the lower jig 42 as shown in FIG. 4A. The lower jig 42 has a
cap-like inner peripheral portion into which the diaphragm ring 41 is fitted and a concentric
projection 43 on which the outer periphery of the dome portion 40a can be placed. An air vent
hole 44 is formed. The upper jig 45 is also formed substantially in a cap shape, and a central hole
46 is bored in the center thereof, and the outer peripheral inner diameter portion thereof is fitted
to the outer peripheral portion of the lower jig 42. A groove 49 through which the lead wire 48
connected to the voice coil can be inserted is formed in a part of the outer jig of the upper jig 45.
The voice coil 47 is inserted into the center hole 46 of the upper jig 45, an adhesive is applied to
the bobbin tip of the voice coil 47, and the upper jig 45 is fitted to the lower jig 42. And the
diaphragm 40 are joined near the outer periphery of the dome portion. After drying, the upper
and lower jigs 45 and 42 are removed to obtain the joined diaphragm 40 of the voice coil 47 as
shown in FIG. 2B.
[0040]
The lead wire 48 at the end of the voice coil 47 is taken out along the edge portion 40b. Next, the
diaphragm 40 with the voice coil 47 is attached to the bottom of the shield cover 9 through the
diaphragm ring 41, the dome portion 40a and the equalizer portion of the horn throat 58 face
each other, and the voice coil 47 passes through the through hole 9a of the shield cover 9. And
the lead wire of the voice coil 47 is soldered to the input terminal 31 B of the cover 65, and then
the cover 65 is fixed to the bottom surface of the shield cover 9 by a predetermined method.
Complete the coaxial 2 way speaker.
[0041]
Also in this speaker configuration, it is possible to use the magnetically shielded, effectively
utilize the energy of the cancel magnet, and commonize the center pole of the tweeter and the
woofer, thereby achieving downsizing.
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[0042]
According to the present invention, the external leakage magnetic flux can be reduced by the
cancellation effect by the cancellation magnet, and the shield cover can be used as the lower
plate, so that the depth of the speaker can be reduced and the coaxial for woofer and tweeter
easily. Type 2 way speaker can be easily obtained.
[0043]
Brief description of the drawings
[0044]
1 is a side sectional view showing an embodiment of the speaker of the present invention.
[0045]
2 is a side sectional view showing another embodiment of the speaker of the present invention.
[0046]
3 is an assembly explanatory view of the low-medium noise speaker used for the speaker of the
present invention.
[0047]
4 is an assembly explanatory view of the high sound speaker used for the speaker of the present
invention.
[0048]
5 is a side sectional view of the conventional speaker.
[0049]
Explanation of sign
[0050]
Reference Signs List 1 coaxial 2 way speaker 6 yoke 5, 7 center pole 8 cancel magnet 9 shield
cover 20 speaker for low to middle tone 30 speaker for high tone
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