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JP2004260662

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DESCRIPTION JP2004260662
The present invention provides a coaxial type composite speaker which is excellent in acoustic
characteristics, can sufficiently cope with downsizing, thinning, and weight reduction, and can
reduce the number of parts to achieve cost reduction. In the invention, a high sound speaker of
coaxial type composite speaker and an inner magnet type as a magnetic circuit of bass speaker
are shared and simplified, and one magnet forms two or three magnetic circuits, and the high
sound speaker The speaker for the bass is driven to reduce the size, thickness and weight.
[Selected figure] Figure 1
Coaxial type composite speaker
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
coaxial type composite speaker suitably used for vehicles and the like. [0002] Conventionally, in
order to reproduce a wide frequency band, composite speakers in which a plurality of speaker
units such as a bass speaker and a treble speaker are combined are widely used in various
applications. [0003] A coaxial type composite speaker is widely known which is arranged
coaxially so that sounds reproduced from the speaker units of each band of the compound
speaker are emitted from substantially the same position. ing. FIG. 5 is an example of a general
coaxial type composite speaker as disclosed in Japanese Patent Laid-Open No. 11-285091, for
high-pitched sound through a supporter 42 provided above the center pole 41 of the bass
speaker 40. The speaker 43 is supported. Although the coaxial type composite speaker having
such a configuration is widely used for in-vehicle use, in the case of an in-vehicle speaker having
a restriction of installation space, further downsizing, thinning, weight saving, etc. are required. It
is difficult to cope with these issues. Further, since the high-tone speaker 43 is provided in front
of the central portion of the low-pitch speaker 40, there is a problem that the acoustic radiation
characteristic of the low-pitch speaker 40 is disturbed by the high-tone speaker 43 and the
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characteristic is deteriorated. In order to solve such a problem, various proposals have been
made. In Japanese Patent Application Laid-Open No. 2002-78086, as shown in FIG. 6, for highpitched sound directly on the magnetic circuit 51 of the bass speaker 50. It is disclosed that the
magnetic circuit 52 is mounted with some parts in common, and the high-pitched speaker 53 is
disposed in the vicinity of the neck portion of the diaphragm 54 of the bass speaker 50. . With
this configuration, miniaturization, weight reduction, improvement of acoustic characteristics,
etc. are measured. [0007] However, the one shown here uses separate magnets for the bass
speaker and the treble speaker, so it is not sufficient in lightening and thinning, and it is
expensive. Since two Fe-B magnets are used, there is also a problem that the cost becomes high.
SUMMARY OF THE INVENTION The present invention has been proposed to solve the abovementioned problems, and the object of the present invention is to provide excellent acoustic
characteristics, and to reduce the size, thickness and weight. It is an object of the present
invention to provide a coaxial type composite speaker which can be sufficiently coped with and
can reduce the number of parts and cost.
According to the present invention, in a coaxial type composite speaker in which the low
frequency speaker 2 and the high frequency speaker 1 are coaxially disposed, the disk-shaped
magnet 5 is mounted on the bottom of the yoke 4 having the outer peripheral wall 4 a. A discshaped center pole 6 having a diameter smaller than that of the magnet 5 and a ring-shaped
plate 7 are concentrically mounted on the upper surface of the magnet 5 at the center, with a
gap on the outer side. And a second magnetic gap 18 between the inner peripheral surface of the
outer peripheral wall 4a of the yoke 4 and the outer peripheral surface of the plate 7,
respectively. A voice coil bobbin 16 of the voice coil bobbin 11 coupled to the high-tone
diaphragm 10 inserted into the first magnetic gap 8 and coupled to a neck portion of the bass
diaphragm 15; The Isukoiru 17 is configured to be inserted into the second magnetic gap 18, it
has achieved the above objects. Further, in a coaxial type composite speaker in which the bass
speaker 2 and the treble speaker 1 are coaxially arranged, a disk-shaped magnet 36 is mounted
on the upper surface of the disk-shaped lower plate 35. A disc-shaped center pole 37 having a
diameter smaller than that of the magnet 36 in the center of the upper surface and a ring-shaped
upper plate 38 having an outer diameter substantially the same as that of the lower plate 35 are
concentrically placed A cylindrical yoke 34A is provided to surround the plate 35, the magnet 36
and the upper plate 38, and a first magnetic gap 39 is formed between the inner peripheral
surface of the upper plate 38 and the outer peripheral surface of the center pole 37, A second
magnetic gap 32 is formed between the inner peripheral surface of the yoke 34A and the outer
peripheral surface of the upper plate 38, and the inside of the yoke 34A. A third magnetic gap 33
is formed between the surface and the outer peripheral surface of the lower plate 35, and the
voice coil 9 of the voice coil bobbin 11 coupled to the high-tone diaphragm 10 is inserted into
the first magnetic gap 39. The voice coil 17A, 17B of the voice coil bobbin 16A coupled to the
neck portion of the bass diaphragm 15 is inserted into the second and third magnetic gaps 32,
33 to achieve the above object. In the above, it is characterized in that the high-tone diaphragm
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10 is a dome-shaped diaphragm, and the bass diaphragm 15 is a cone-shaped diaphragm.
Further, the first magnetic gaps 8 and 39 and the second magnetic gaps 18 and 32 are disposed
substantially in the same plane, and the high-tone speaker 1 is in the vicinity of the neck of the
low-pitch diaphragm 15 of the low-pitch speaker 2. And it is characterized by being
accommodated inside voice coil 17 and 17A for low tones.
BEST MODE FOR CARRYING OUT THE INVENTION The present invention uses an internal
magnet type as a magnetic circuit of a coaxial type composite speaker, and forms a plurality of
magnetic gaps with one magnet to simplify the magnetic circuit and reduce the size. To make it
thinner, thinner and lighter. Hereinafter, the present invention will be described with reference to
the drawings. Embodiment 1 FIG. 1 is a central longitudinal sectional view of a first embodiment
of the present invention, and FIG. 2 is an enlarged sectional view of an essential part. In this
embodiment, in a coaxial type composite speaker having an inner magnet type magnetic circuit,
the magnetic circuit of the high sound speaker and the low sound speaker are shared, and the
yoke, one magnet, the center pole, and the pole piece are used. It is characterized in that two
magnetic gaps of a magnetic gap for arranging a voice coil of a high-pitched speaker and a
magnetic gap for arranging a voice coil of a low-pitched speaker are formed in a magnetic circuit
composed of e.g. That is, in these figures, 1 is a high-pitched speaker, 2 is a bass speaker
provided coaxially on the outside thereof, 3 is an internal magnetic type magnetic circuit shared
by these respective speakers, and this magnetic circuit 3 A substantially bottomed cylindrical
yoke 4 having an outer peripheral wall 4a and having an outer end formed with a flange portion
4b projecting outward in the orthogonal direction, and a disc-like member mounted on the
bottom surface of the yoke 4 And a disc-like center pole 6 having a diameter smaller than that of
the magnet 5 provided at the center of the upper surface of the magnet 5 and a ring mounted
concentrically with a gap on the outside of the center pole 6 And the plate 7 of the shape of a
circle. A first magnetic gap 8 is formed between the inner peripheral surface of the projection 7 a
formed above the inner peripheral surface of the plate 7 and the outer peripheral surface of the
center pole 6 disposed opposite to the projection 7 a, The voice coil 9 on the high tone speaker
side is inserted into the first magnetic gap 8. The voice coil 9 is provided on the lower outer
peripheral surface of the cylindrical voice coil bobbin 11 coupled to the outer peripheral end of
the dome-shaped high-tone diaphragm 10. Further, the edge 12 of the outer peripheral portion
of the high-sound diaphragm 10 is an upper portion of the upper plate 38 and a substantially
ring-shaped diaphragm ring 13 provided apart on the outer peripheral side of the voice coil
bobbin 11 and its upper portion Is held and held by a tweeter frame 14 provided on the The
front inner peripheral surface of the tweeter frame 14 is curved in a trumpet shape so that
desired directivity and acoustic effect can be obtained.
The high-tone speaker 1 is constituted by the high-tone diaphragm 10, a voice coil bobbin 11
having a voice coil 9 coupled thereto, a tweeter frame 14, a diaphragm ring 26, and the like. The
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high-pitched speaker 1 is accommodated in the vicinity of the neck portion of the low-pitched
diaphragm 15 of the low-pitched speaker 2 outside the high-pitched speaker 1 and inside the
voice coil bobbin 16 on the low-pitched speaker 2 side. A voice coil 17 is provided below the
outer periphery of the voice coil bobbin 16, and the voice coil 17 comprises an outer peripheral
surface of the plate 7 and an inner peripheral surface of an outer peripheral wall 4 a of the yoke
4 disposed opposite thereto. In the second magnetic gap 18 between them. The outer peripheral
portion of the cone-shaped bass diaphragm 15 of the bass speaker 2 is attached to a flangeshaped mounting portion 20 a formed on the outer peripheral portion of the frame 20 via the
edge 19, and the bass diaphragm 15 The inner peripheral end of the damper 21 is connected to
the neck portion, and the outer peripheral end of the damper 21 is attached to a mounting
portion 20b formed on the inner side of the frame 20, whereby the diaphragm 15 and the voice
coil 17 are provided for vibration. It is done. The top surface of the center pole 6, the top surface
of the plate 7 and the top surface of the outer peripheral wall 4a of the yoke 4 are substantially
flush, and the first magnetic gap 8 and the second magnetic gap 18 are substantially coplanar. As
described above, the voice coil of the high frequency speaker 2 is inserted in the first magnetic
gap 8 and the voice coil of the low frequency speaker 2 coaxially configured on the outside of the
high frequency speaker 1 in the second magnetic gap 18 17 is inserted. As described above, in
this embodiment, one magnet 5 is shared to form two first and second magnetic gaps 8 and 18 of
the high-pitched speaker 1 and the low-pitched speaker 2. In addition, in FIG. 1, reference
numeral 22 denotes a terminal to which the lead wire of the high-tone voice coil 9 is connected.
Reference numeral 23 denotes a terminal plate provided on the outer surface side of the frame
20. As is well known, input terminals for the low-pitched voice coil 17 and the high-pitched voice
coil 9 are provided. The frame 20 is fixed to the upper surface of the flange 4 b of the yoke 4 by
caulking. 24 is its fixed part. Embodiment 2 FIG. 3 is a central longitudinal sectional view of a
second embodiment of the present invention, and FIG. 4 is an enlarged sectional view of the main
part thereof. In this embodiment, a first magnetic gap 31 for inserting a voice coil for highpitched voice, a second magnetic coil for inserting a voice coil for low-pitched voice, and an inner
magnetic type magnetic circuit 30 having one magnet are inserted. Three magnetic gaps 32 and
33 are formed, one magnet forms triple magnetic gaps, two voice coils of the bass speaker 2 are
formed, and they are used as second and third magnetic gaps 32 and 33. It is characterized in
that it can be arranged and driven with high output.
That is, in the magnetic circuit 30, a cylindrical portion 34d for mounting the magnetic circuit 30
is provided so as to project on the bottom 34c of the magnet holder 34 made of a nonmagnetic
material having a flange 34b at the upper end of the outer peripheral wall 34a. A disk-shaped
lower plate 35, which is a component of the magnetic circuit 30 larger in diameter than the
cylindrical portion 34d, is mounted on the upper surface thereof, and a disk-shaped magnet 36
smaller in diameter than the lower plate 35 is mounted on the upper surface As in the first
embodiment described above, the center pole 37 and the upper plate 38 are mounted on the
upper surface of the magnet 36 to form a first magnetic gap 39. The outer diameter of the upper
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plate 38 is equal to the outer diameter of the lower plate 35. Further, on the inner peripheral
surface of the outer peripheral wall 34a of the magnet holder 34, an inwardly projecting step
34e for mounting the cylindrical yoke 34A which is a component of the magnetic circuit 30 is
formed. The yoke 34A is placed on the portion 34e. The yoke 34A is formed in a dimension
extending between the upper surface of the upper plate 38 and the lower surface of the lower
plate 35, and the lower plate 35, the magnet 36, the center pole 37, the pole piece 38, etc. are
located in the yoke 34A. And an inner magnetic type magnetic circuit 30, and a second,
respectively, between the inner peripheral surface of the yoke 34A and the outer peripheral
surface of the upper plate 38 and the outer peripheral surface of the lower plate 35 disposed
opposite to each other with a gap therebetween. Third magnetic gaps 32 and 33 are formed
respectively. The point that the voice coil 9 of the high-tone speaker is inserted into the first
magnetic gap 31 is the same as that of the above-described first embodiment. Further, the upper
end portion of the voice coil bobbin 16A on the bass speaker side is coupled to the neck portion
of the bass diaphragm 15, and the lower end portion of the voice coil bobbin 16A is extended to
the lower surface side of the lower plate 35. A first voice coil 17A located between the second
magnetic gaps 32 at the upper part of the outer periphery of the coil bobbin 16A and a second
voice coil 17B located between the third magnetic gaps 33 at the lower outer part thereof are
respectively provided. There is. As described above, in this embodiment, two low-pitch first and
second voice coils 17A and 17B are provided, and these are inserted into the second and third
magnetic gaps 32 and 33, respectively. The plate 15 is driven. In this embodiment, the frame 20
is fixed to the flange 34 b of the yoke 34 by a fixing portion made of a screw 40 or the like, but
can be fixed by caulking as in the first embodiment.
The other configuration is the same as that of the above-described embodiment, and thus the
detailed description is omitted to avoid the repetition of the description. It goes without saying
that the present invention is applicable not only to vehicles but also to other applications. As
described above, according to the present invention as set forth in claims 1 and 3, it is not
necessary to separately provide the magnetic circuits 3 and 30 of the bass speaker 2 and the
treble speaker 1 but one of them. The magnets 5 and 36 are shared to form the magnetic gaps 8,
18 and 31 to 33 of the bass speaker 2 and the treble speaker 1, so that downsizing, thinning,
weight reduction, etc. can be achieved, and the number of parts can be reduced. The cost can be
reduced by According to claims 2 and 3, in addition to the first magnetic gap 31 of the highpitched speaker 1, two upper and lower magnetic gaps of the low-pitched speaker 2 are formed
to make a dual gap configuration, and one magnet 36 In the case where the three magnetic gaps
are formed, the small size and high output can be obtained. According to the fourth aspect of the
invention, in addition to the above effect, the first magnetic gap 8 and the second magnetic gap
18 are disposed substantially in the same plane, and the high-tone speaker 1 has a cone shape of
the bass speaker 2. The configuration can be made thinner by being accommodated near the
neck of the diaphragm 15 and inside the voice coil 16 or 16A for the low-frequency speaker, and
the reproduction sounds of the two speakers do not interfere with each other. Sound emission
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characteristics are improved and sound image localization is also optimized. BRIEF DESCRIPTION
OF THE DRAWINGS FIG. 1 shows a central longitudinal cross-sectional view of a first
embodiment of the present invention. FIG. 2 shows an enlarged schematic cross-sectional view of
an essential part of the same embodiment of the present invention. FIG. 3 shows a central
longitudinal cross-sectional view of a second embodiment of the present invention. FIG. 4 shows
an enlarged schematic cross-sectional view of an essential part of the same embodiment of the
present invention. FIG. 5 shows an example of the prior art. FIG. 6 shows another conventional
example. [Description of the code] 1 Loudspeaker 2 Bass speaker 3 Magnetic circuit 4 Yoke 4a
Outer peripheral wall 4b Flange 5 Magnet 6 Center pole 7 Plate 7a Projection 8 1st magnetic gap
9 Voice coil for 10 high tone speaker 10 dome shape Diaphragm 11 voice coil bobbin 12 edge
13 diaphragm ring 14 tweeter frame 15 diaphragm 16, 16A voice coil bobbin 17, 17A, 17B
voice coil 18 second magnetic gap 19 edge 20 frame 20 frame 20a, 20b mounting part 21
damper 22 terminal 23 terminal plate 24 fixed portion 30 magnetic circuit 31 first magnetic gap
32 second magnetic gap 33 third magnetic gap 34 magnet holder 34A yoke 34a outer peripheral
wall 34b flange portion 34c bottom portion 34d cylindrical portion 3 e stepped portion 35 lower
plate 36 magnets 37 center pole 38 top plate 39 a first magnetic gap 40 screw
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