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JPH08149589

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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 JPH08149589
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
coaxial speaker structure in which a high-pitched speaker is disposed on or near the central axis
of the front surface of a diaphragm of a low-pitched speaker.
[0002]
2. Description of the Related Art As shown in FIG. 9, a coaxial type speaker in which a tweeter 1,
which is a high-tone speaker, is disposed on or near the central axis of the front surface of a
diaphragm 23 of a woofer 2, which is a bass speaker. However, in the conventional coaxial
speaker structure, the magnetic circuit of the woofer 2 is a usual external magnet type composed
of the yoke 21, the magnet 24a and the top plate 36, and this magnetic circuit is a speaker
frame. A support 22 is provided on the top 21a of the yoke 21 and the tweeter 1 is attached
thereto via the support 22. As a result, the tweeter 1 is provided on the front surface of the
diaphragm 23 of the woofer 2 It has a structure to be placed.
[0003]
Recent coaxial type loudspeakers are widely used particularly for vehicles, and weight reduction
and thickness reduction are required for such vehicle loudspeakers.
However, since the conventional coaxial speaker has the above-described structure, it is
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extremely difficult to reduce the weight and thickness while maintaining the current
performance.
[0004]
Therefore, an object of the present invention is to provide a high-performance coaxial speaker
structure suitable for on-vehicle use, which can be reduced in weight and thickness by solving
the above-mentioned conventional drawbacks.
[0005]
SUMMARY OF THE INVENTION The structure of the speaker according to the present invention
is a coaxial type speaker in which a high-tone speaker is disposed on or near the center axis of
the front surface of the diaphragm of the bass speaker. As a magnetic circuit of the speaker, a
repulsion type magnetic circuit is used in which a voice coil is driven by using magnetism which
makes two magnets face each other with the same poles facing each other.
[0006]
Then, by arranging the high-tone speaker on the front surface of the repulsion type magnetic
circuit of the low-pitch speaker, it is possible to reduce the weight and thickness.
Further, the magnet and the plate disposed between the magnets in the repulsion type magnetic
circuit are formed in a ring shape, and the high sound speaker is attached to a holder member
disposed to support the magnet and the inner diameter side of the plate.
[0007]
Furthermore, by arranging a ring made of a resin or the like between the magnet forming the
repulsion type magnetic circuit of the low frequency speaker and the yoke forming the magnetic
circuit of the high frequency speaker, the fixing stability of the high frequency speaker is
secured. Enables efficiency adjustment.
[0008]
[Operation] By using a repulsion type magnetic circuit as a magnetic circuit of a bass speaker,
weight reduction and thinning of the bass speaker can be achieved, and the front surface of one
magnet in the repulsion type magnetic circuit of the bass speaker By arranging the high-pitched
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speakers in this case, the magnetism of the magnetic circuit of the low-pitched speaker and the
magnetism of the magnetic circuit of the high-pitched speaker interact with each other to
improve the efficiency of the high-pitched loudspeaker.
[0009]
In addition, by using the holder member for holding the plate of the low-pitch speaker and the
plate disposed between the two magnets as a post for attaching the high-tone speaker, a post,
which has been separately required in the past, is unnecessary. As a result, the number of parts is
reduced and the number of assembly steps is also reduced.
Further, by disposing a ring between the magnet forming the repulsion type magnetic circuit of
the bass speaker and the yoke forming the magnetic circuit of the treble speaker, the efficiency
of the treble speaker can be adjusted.
[0010]
And, by arranging this ring, it becomes easier and more rigid to fix the repulsion type magnetic
circuit such as the magnet and the plate of the speaker for bass, and wiring to the speaker for
high sound attached to the front of the speaker for bass is easy. become.
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the structure of
a loudspeaker according to the present invention will be described based on FIGS. 1 to 8. The
same reference numerals are given to the same components as the conventional components
described in FIG. The description is omitted.
The tweeter 1, which is a high sound speaker, uses the same one as the conventional one
described in FIG.
The woofer 2 which is a bass speaker is a loudspeaker using a repulsion type magnetic circuit.
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The basic configuration of this repulsion type magnetic circuit is to arrange two magnets so that
the same pole sides face each other and arrange and drive a voice coil in a magnetic field by
repulsive magnetic flux generated in the outer peripheral direction, We also proposed a speaker
using such a repulsion type magnetic circuit (for example, Japanese Utility Model Application
Laid-Open Nos. 5-55693, 5-93197, 6-23379, etc.). In the present embodiment, two magnets 24b
and 24c used are neodymium-based magnets having a ring shape having an outer diameter of 29
mm, an inner diameter of 12 mm, and a thickness of 7 mm, and the magnets 24b and 24c are
used respectively. It is magnetized in the thickness direction.
[0012]
The magnets 24 b and 24 c and the center plate 25 disposed between the two magnets are held
by a holder member 26 made of aluminum. That is, a cylindrical center guide portion 26a having
an outer diameter of 11.78 mm is provided at the central portion of the holder member 26, and
the magnet 24b and the center guide portion 26a are separated by the center plate 25 as shown
in FIG. The center plates 25 are inserted so that the N poles of 24c face each other, that is, the
center plate 25 is held between the N poles of the magnets 24b and 24c. The center plate 25 is
an iron plate having an outer diameter of 30 mm, an inner diameter of 11.3 mm, and a thickness
of 4 mm.
[0013]
As shown in FIG. 1, the holder member 26 has a hole previously formed in the bottom of the
frame 27 and an outer peripheral portion of the bottom of the holder 26 attached by means such
as caulking. The dimensions of the frame 27 are generally called 6.5 mm with an outer diameter
of 165 mm and a depth of 25 mm, and the material is 0.7 mm thick iron and is generally called a
press frame. It is a thing.
[0014]
The diaphragm 23 of the vibration system member has a diameter of 146 mm (including the
outer diameter of the edge 23a), and a central portion of the diaphragm 23 is provided with a
hole of 32 mm in diameter for coupling with the voice coil 28 as a neck portion 23b. The
diaphragm 23 is a 17 mm deep cone-shaped diaphragm made of pulp, and the surface of the
diaphragm 23 has a width of about 8 mm from the neck portion 23 b to the outside of the cone
on the center line of the diaphragm 23. And two copper foils 23c having a length of about 35
mm and a thickness of 50 microns are attached in the left-right direction.
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[0015]
As shown in FIG. 3, the voice coil 28 is made of PPTA (poly-p-phenylene terephthalamide) film
having a bobbin material 28a of 0.025 mm, a coil wire diameter of 0.16 mm, and a coil winding
width of 5.3 mm. Is 3.6 Ω.
The voice coil is disposed with a certain clearance L between the outer peripheral portion of the
center plate 25 and the inner peripheral portion of the voice coil 28, and copper foil is attached
to a predetermined position of the coil outer peripheral portion. The damper 29 is made by
impregnating a cotton cloth with phenol and stitching two flat braided tinsel wires together,
thermoformed in a state along the corrugation, and die-cut out, and these vibration system
members and the magnetic member The circuit is attached to the frame 27 and assembled.
[0016]
The center guide 26a of the holder member 26 is longer in the thickness direction than the
magnetic circuit portion, in the upward direction as shown in FIG. 1, and for fixing the magnetic
circuit and fixing the tweeter 1 on the front surface of the magnetic circuit. Ring 30 is attached.
The ring 30 is made of resin, and its shape is 29 mm in outer diameter, 11.98 mm in inner
diameter, and 6 mm in thickness. A bonding margin portion is provided on the outer peripheral
portion of the ring 30 so that a dustproof damper 31 made of a dustproof woven fabric having a
corrugation such as the commonly used damper is attached, and further, the outer periphery
Two relay terminals 30 a are provided on the center line of the ring 30 so as to facilitate wiring
to the tweeter 1 in the part. The dustproof damper 31 is obtained by impregnating cotton cloth
with phenol, sewing a flat braided tinsel wire on the back side so as to pass near the center line
of the dustproof damper 31, thermoforming corrugation etc. . The dustproof damper 31 aligns
and bonds the flat braided wire wire of the dustproof damper 31 with the copper foil 23c of the
diaphragm 23 of the woofer 2 and the relay terminal 30a of the ring 30, The end of the wire and
the contact portion of the copper foil 23c of the diaphragm 23 are soldered. Further, the end of
the flat braided tinsel wire extending to the inner peripheral portion is connected to the input
terminal 16 of the tweeter 1 and is soldered in the same manner as the end portion of the outer
peripheral portion. Since the copper foil 23c extending to the neck portion 23b is soldered to the
copper foil provided on the outer periphery of the voice coil 28, the input from the connection
terminal 33 of the woofer 2 is also supplied to the tweeter 1 as a result .
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[0017]
As shown in FIG. 4, the outer peripheral shape of the tweeter 1 seen from the front of the
diaphragm 11 is an elliptical shape having a major diameter of 33 mm and a minor diameter of
22 mm, and the cross-sectional shape is a cone shape. Therefore, the elliptical shape continues to
the neck portion, and the voice coil 12 also has an elliptical shape with a major diameter of
15.46 mm and a minor diameter of 10.13 mm. Further, the diaphragm 11, the voice coil 12, and
the respective portions of the cap 11a are integrally molded, so that the cap 11a portion is also
elliptical. The magnetic gap 13 of the tweeter 1 is set to 1.3 mm, and the magnet 14 uses an
elliptical and ring-shaped neodymium magnet having a major diameter of 35 mm, a minor
diameter of 24 mm, and a thickness of 2 mm. It is carried out in the thickness direction of the
magnet 14, and the yoke 15 side is the S pole. The bottom center of the yoke 15 is provided with
a tap processing 15 a for attaching the tweeter 1.
[0018]
In the case of the present embodiment, the diaphragm 11 having an elliptical shape and the
tweeter 1 having a magnetic circuit are used as viewed from the front, but the present invention
is not limited to this, and a circular diaphragm 11 generally used conventionally is used. The
tweeter 1 may be used, or the diaphragm 11 of the tweeter 1 may have a dome shape or the like
rather than a cone shape, or the diaphragm 23 of the woofer 2 may have a flat shape or the like
instead of a cone shape. It can be used according to each purpose, and there is no design
restriction. Furthermore, the network 34 of this embodiment uses one 3.3 μF capacitor on the
tweeter 1 side, and is a 6 dB high pass filter. The tweeter 1 is fixed to the front surface of the
magnetic circuit of the woofer 2 with a screw 32 and connected to the tinsel cord of the
dustproof damper 31 to constitute a speaker A. In this speaker A, the magnetic circuits of the
woofer 2 and the tweeter 1 repel each other.
[0019]
Next, in the magnetic circuit of the woofer 2, opposite to the above embodiment, the south poles
of the magnets 24b and 24c are held so as to face the center plate 25, and the other components
are all the speakers A speaker B set identical to A was created. In this speaker B, the magnetic
circuits of the woofer 2 and the tweeter 1 are in the form of being attracted to each other. FIG. 8
shows the frequency characteristics of only the tweeter 1 in the speaker A and the speaker B, and
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it is clear that the efficiency of the speaker A is 1 to 2 dB higher than that of the speaker B over
the entire reproduction band of the tweeter 1 as apparent from this figure. The results were
obtained.
[0020]
That is, as shown in FIG. 7, the magnetism (S pole side) and the tweeter of the magnet 24b and
24c of the repulsion type magnetic circuit of the woofer 2 of the speaker A, and the magnet 24b
of the side to which the tweeter 1 is attached in this embodiment. The magnetism of the
magnetic circuit of 1 interacts with each other, and the magnetism for the woofer 2 is extremely
effectively added to the magnetism for the tweeter 1, resulting in the increase of the magnetic
flux density of the magnetic gap 13 of the tweeter 1.
[0021]
More specifically, the magnetic flux density of the magnetic gap 13 of the tweeter 1 in the
speaker A is 1.159 tesla, and the magnetic flux density of the magnetic gap 13 of the tweeter 1
in the speaker B is 1.036 tesla.
The magnetic flux density of the magnetic gap 13 of the single tweeter 1 is 1.133 tesla.
[0022]
When configured as in the above embodiment, it is possible to extremely effectively utilize the
magnetism of the repulsive type magnetic circuit of the woofer 2. Therefore, the efficiency of the
tweeter 1 is improved by attaching the magnetic circuits generated from the magnetic circuit of
the woofer 2 and the magnetic circuit of the tweeter 1 so that they repel each other. That is, in
order to obtain the same efficiency as the conventional tweeter 1, a magnet smaller than the
magnet 14 used in the conventional tweeter 1 may be used, and as a matter of course, also the
parts constituting the magnetic circuit The size can be reduced and the cost can be reduced.
Conversely, if it is desired to reduce the efficiency of the tweeter 1 by sound quality adjustment
etc., it can be easily adjusted if the magnetic circuit of the woofer 2 and the magnetic circuit of
the tweeter 1 are attached in a suction direction.
[0023]
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Further, by using the center guide 26a provided on the holder member 26 as a support for
mounting the tweeter 1, the support 22 for mounting the tweeter 1 conventionally required
becomes unnecessary, and the number of parts is reduced and the number of assembling steps is
also increased. The cost can be reduced. Further, in the case of the present embodiment, since
the material of the holder member 26 is aluminum, it is extremely effective for heat radiation of
the magnetic circuits of the tweeter 1 and the woofer 2. Therefore, it is an extremely effective
means for improving the power resistance performance.
[0024]
Furthermore, by arranging the ring 30 between the bottom of the yoke 15 of the tweeter 1 and
the magnet 24b of the woofer 2 as in the present embodiment, the contact area of the yoke 15 of
the tweeter 1 is increased and the mounting strength is increased. By fastening 32, the magnetic
circuit of the woofer 2 is extremely strongly held by the bottom surface of the holder member 26
via the ring 30. In the conventional magnetic circuit assembling method, a method of assembling
the magnetic circuit member by bonding is generally used, but in the structure of the present
embodiment, necessary and sufficient assembling strength can be obtained without using an
adhesive. is there. Therefore, it has the advantage that the number of assembly steps is reduced.
[0025]
In addition, the efficiency of the tweeter 1 can be easily adjusted by changing the thickness, the
cross-sectional shape and the like of the ring 30. Therefore, there is an advantage that subtle
sound quality adjustment can be performed extremely easily. Furthermore, when the ring 30 or
the like is not used, a constraint condition occurs such that the inner peripheral portion of the
dustproof damper 31 must be bonded to the vicinity of the outer peripheral portion of the
magnet 24b of the woofer 2 or the like. It is extremely difficult to change the vicinity of the outer
periphery of the magnet 24b to a shape suitable for the adhesion of the inner periphery of the
dustproof damper 31. Generally, the dustproof damper 31 in a coaxial speaker takes account of
the amplitude of the diaphragm of the woofer 2, etc. The cross-sectional shape is more
advantageous as the degree of freedom in design is greater. Therefore, when designing the crosssectional shape of the dustproof damper 31, the above-mentioned restriction condition is an
extremely large restriction that loses design freedom and limits performance.
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[0026]
However, the resin ring 30 is disposed between the bottom surface of the yoke 15 of the tweeter
1 and the upper surface of the magnet 24b of the woofer 2 as in this embodiment, and the inner
peripheral portion of the dustproof damper 31 is adhered. There is an advantage that the degree
of freedom of design is greatly increased and the width of selection such as the cross-sectional
shape and arrangement of the dustproof damper 31 can be greatly increased and the width of
the selection can be expanded easily. It is possible to extremely easily perform the wiring
connection for input, and to reduce the number of wiring operations.
[0027]
In the case of this embodiment, the material of the ring 30 is resin, but the material of the ring
30 may be a magnetic material by devising the wiring etc. to the tweeter 1, and the lower side of
the resin ring 30, Alternatively, it is also possible to arrange a ring 30 made of a magnetic
material on the upper side etc., adjust the flow of magnetism of the woofer 2 and the tweeter 1,
and adjust the balance of the sound quality and characteristics of the woofer 2 and tweeter 1.
[0028]
Further, focusing on the flow of magnetism, in the case of the present embodiment, the screw 32
made of iron was used to fix the tweeter 1, but if the screw 32 is used a non-magnetic screw such
as stainless steel or brass. It is possible to further improve the efficiency.
Incidentally, according to the analysis result, while the magnetic flux density of the magnetic gap
13 of the tweeter 1 of the speaker A using the screw 32 made of iron is 1.159 Tesla, the speaker
using the screw 32 of nonmagnetic material The magnetic flux density of the magnetic gap 13 of
the tweeter 1 is 1.232 Tesla.
[0029]
According to the structure of the loudspeaker according to the present invention, in the coaxial
loudspeaker, the magnetic circuit of the bass loudspeaker is configured as a repulsive magnetic
circuit so that the loudspeaker for high noise is disposed on the front face thereof. The whole can
be made thin and light, and it is extremely effective as an on-vehicle speaker.
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Moreover, since the distortion is less than that of the conventional coaxial speaker, good sound
quality can be obtained even in a narrow space such as a car interior, particularly in an
installation place where mount depth is limited.
[0030]
Brief description of the drawings
[0031]
1 is a cross-sectional view of a speaker according to the present invention.
[0032]
2 is a front view of the speaker according to the present invention.
[0033]
3 is an enlarged sectional view showing the main part of the repulsion type magnetic circuit.
[0034]
Fig. 4 Front view of the tweeter.
[0035]
Fig. 5 Cross section of the tweeter.
[0036]
6 is an enlarged cross-sectional view of a portion in FIG.
[0037]
7 is a diagram of magnetic field analysis of the speaker according to the present invention.
[0038]
8 is a frequency characteristic for comparing the frequency characteristic of the tweeter in the
speaker according to the present invention.
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[0039]
9 is a cross-sectional view showing an example of a conventional coaxial speaker.
[0040]
Explanation of sign
[0041]
Reference Signs List 1 tweeter 11 diaphragm 11a cap 12 voice coil 13 magnetic gap 14 magnet
15 yoke 15a tap processing 16 input terminal 2 woofer 21 yoke 21a yoke top 22 support 23
diaphragm 23a edge 23b diaphragm neck portion 23c copper foil 24a magnet 24b repulsion
Type magnet circuit magnet 24c Repellent type magnet circuit magnet 25 Center plate 26
Holder member 27 Frame 28 Voice coil 29 Damper 30 Ring 30a Relay terminal 31 Dustproof
damper 32 Screw 33 Connection terminal 34 Network 35 Lead wire 36 Top plate A Woofer and
tweeter Speaker B's magnetic circuit repel each other, Speaker B's woofer and tweeter's magnetic
circuit attract each other
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