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JP2009005180

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2009005180
A coaxial speaker device which arranges a low frequency woofer unit as a sound source, a high
frequency tweeter unit, and a bass reflex port so as to be all coaxial to suppress the external size
and output reproduced sound with excellent localization feeling. Get SOLUTION: A bass woofer
unit 10 and a treble tweeter unit 11 are coaxially arranged, and the center axis is coaxial with the
bass woofer unit 10 and the treble tweeter unit 11, and the outer periphery of the bass woofer
unit 10 is arranged. The rear cabinet 3 is provided with a bass reflex port 13 having an annular
hole, and the back of the bass reflex port 13 is formed in a concave shape with a threedimensional curved surface so as to disperse the reflection of sound waves generated by the bass
woofer unit 10. Prepare. [Selected figure] Figure 1
Coaxial speaker device
[0001]
The present invention relates to a coaxial speaker device in which a low-frequency woofer unit
and a high-tone tweeter unit are coaxially arranged to reproduce an audio signal.
[0002]
Various technologies have been proposed for coaxial speaker devices in which a bass speaker
and a treble speaker are coaxially arranged, and various techniques have been proposed
centering on car audio, and a cone-type loudspeaker for bass reproduction is used to reproduce
the entire band of audio signals. There is one in which a substantially cylindrical joint member is
installed at the central portion of the diaphragm and fixed using the above-mentioned joint
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member so that the high sound speaker is coaxial on the front surface of the cone type speaker
(for example, Patent Document 1) reference).
Further, there is one in which a hollow portion is provided at the center of the yoke of the bass
speaker, and the bass speaker and the treble speaker are coaxially configured such that the
hollow portion becomes a cabinet of the treble speaker (for example, Patent Document 2)
reference). As described above, in the coaxial speaker device, a support member or the like is
usually provided at the central portion of the diaphragm of the woofer unit of the low frequency
speaker, and the tweeter unit of the high sound speaker is mounted on the front surface of the
low frequency woofer unit using the above support member. It is fixed and arranged so that
these speakers are coaxial. Those configured in this way do not have a bass reflex port or, for
example, a bass reflex port is provided on the side of each speaker unit attached to a baffle
board.
[0003]
JP-A-2005-303484 (page 5, FIG. 1) JP-A-2006-173863 (pages 3-5, FIGS. 1-3)
[0004]
Since the conventional coaxial speaker device is configured as described above, it is difficult to
provide a bass reflex port when the bass woofer unit and the treble tweeter unit are coaxially
arranged, and the bass reflex port is not provided. Poor audio output in the low range.
In addition, when the bass reflex port is provided in the coaxial speaker device, the projection
area when the device is viewed from the front becomes large, which makes it difficult to
miniaturize the device.
[0005]
The present invention has been made to solve the problems as described above, and the sound
source, the bass woofer unit, the high-pitched tweeter unit, and the bass reflex port are all
arranged coaxially to have an external size It is an object of the present invention to provide a
coaxial speaker device that suppresses reproduced signals and outputs reproduced sound with
excellent sense of localization.
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2
[0006]
The coaxial speaker device according to the present invention includes the bass woofer unit and
the bass reflex port whose center axis is coaxial with that of the treble tweeter unit.
[0007]
According to the present invention, since the bass woofer unit and the treble tweeter unit are
arranged coaxially with the bass reflex port, the projection area when viewed from the front can
be suppressed, and the sound source is made coaxial. This has the effect of being able to output a
reproduced sound having an excellent sense of localization while suppressing the external size.
[0008]
Hereinafter, an embodiment of the present invention will be described.
Embodiment 1
FIG. 1 is a cross-sectional perspective view showing a configuration of a coaxial speaker device
according to Embodiment 1 of the present invention.
This figure shows a cross section along the reproduction sound output direction of the coaxial
speaker device 1 according to the first embodiment. The coaxial speaker device 1 constitutes a
cabinet of the device by a front baffle 2 forming a front portion to which a reproduction sound is
radiated and output, and a rear cabinet 3 joined to the front baffle 2. Inside the rear cabinet 3, a
bass woofer unit 10 is disposed and fixed. A treble tweeter unit 11 is disposed in front of the lowfrequency woofer unit 10. The tweeter unit 11 for high sound is supported and fixed so that the
central axis AA 'and the central axis of the tweeter unit 11 shown in the drawing are coaxial with
the support portion 12 formed on the front baffle 2. The above-mentioned bass woofer unit 10 is
also disposed and fixed so that the central axis AA 'and the central axis of the same are coaxial.
Further, a bass reflex port 13 formed as described later is provided on the front baffle 2 so as to
be coaxial with the central axis AA '.
[0009]
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FIGS. 2A and 2B are explanatory diagrams showing the configuration of the coaxial speaker
device according to the first embodiment. FIG. 2A shows a shape of the coaxial speaker device 1
when viewed from the front, and FIG. 2B shows a longitudinal cross section of the coaxial
speaker device 1 when viewed from the side. The same reference numerals are used for the same
parts and the description thereof is omitted. The front baffle 2 is formed like a lid for closing the
end of the cylinder, and when viewed from the front, it has a circular shape as shown in FIG.
Sound radiation holes 21 for radiating the output sound of the woofer unit 10 and the tweeter
unit 11 for high sound are provided at appropriate positions. Further, the front portion 20 of the
front baffle 2 is provided with, for example, a plurality of support portions 12 extended from the
outer peripheral portion to the central portion of the front portion 20, for example, bridged to
the aforementioned sound radiation holes 21 The tweeter unit 11 for high-pitched sound is
installed and fixed to these support portions 12 formed in a shape using an adhesive or the like.
[0010]
Further, in the front portion 20 of the front baffle 2, the woofer for low-pitched sound so that the
opening of the bass reflex port 13 annularly formed as will be described later is coaxial with the
woofer unit for low-pitched sound 10 and the tweeter unit 11 for high-pitched sound It is
provided in the position surrounding the outer periphery of the sound emission hole 21 provided
in order to radiate | emit the audio | voice which the unit 10 generate | occur | produced. The
rear cabinet 3 is formed in a hollow and substantially conical shape as shown in FIG. 1 and FIG.
2-2 so that the bass woofer unit 10 is contained in the vicinity of the opening where the front
baffle 2 is joined. Is configured. In addition, the apex portion of the substantially conical rear
cabinet 3, that is, the rear end 22 of the rear cabinet 3, has a concave shape whose inner wall
shape is a three-dimensional curved surface, and has sufficient structural strength and sound
reflection characteristics. The rear cabinet 3 is configured such that the above-mentioned inner
wall shape can be formed by providing the above. The inner wall shape of the rear end portion
22 is such that, among the sound waves in the audible band generated by the low-frequency
woofer unit 10 described later, the sound waves that have progressed into the coaxial speaker
device 1 such as the rear cabinet 3 are reflected on the inner wall of the rear cabinet 3 The
reflected sound waves are formed to be dispersed so that standing waves are not generated.
[0011]
The low frequency woofer unit 10 includes a magnetic circuit not shown, such as a pole, a
magnet, and a plate, a voice coil disposed in the magnetic gap of the magnetic circuit, and a coneshaped diaphragm 10a coupled to a bobbin of the voice coil. For example, as shown in FIG. 2-2,
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the speaker unit is attached and fixed to a mounting portion 23 formed on the back side of the
front baffle 2 by screwing or the like. The treble tweeter unit 11 has a magnetic circuit (not
shown), a magnetic circuit, a plate, etc., a voice coil disposed in the magnetic gap of the magnetic
circuit, and a dome-shaped diaphragm coupled to the bobbin of the voice coil. As described
above, the speaker unit is attached and fixed to the back surface of the support portion 12 of the
front baffle 2 using an adhesive or the like.
[0012]
The bass reflex port 13 provided in the front baffle 2 surrounds the outer periphery of the coneshaped diaphragm 10 a of the bass woofer unit 10 disposed inside the rear cabinet 3 when the
coaxial speaker device 1 is viewed from the front. It has an annular opening formed. Further,
when the coaxial speaker device 1 is viewed sideways, the bass reflex port 13 is extended, for
example, 70 [mm] toward the rear end 22 of the rear cabinet 3 from the inside of the front baffle
2, ie, the back of the front part 20. An annular hole similar to the above-mentioned opening is
extended from the back of the front baffle 2 to the inside of the rear housing 3. Although the
bass reflex port 13 is formed so that the hole shape when the front baffle 2 is viewed from the
front becomes annular, it is structurally possible to form the annular through hole in the front
baffle 2 without interruption. Since it is impossible, the inner side wall and the outer side wall of
the annular or donut-shaped hole are appropriately connected at a plurality of places to form the
bass reflex port 13 in the front baffle 2.
[0013]
Next, the operation will be described. When a current of an audio signal input from the outside
flows through each voice coil of the woofer unit 10 for bass and the tweeter unit 11 for high tone
omitted, the cone-shaped diaphragm 10a of the woofer unit 10 for bass and the tweeter unit 11
for high tone The domed diaphragm vibrates, and an audible sound that reproduces the audio
signal is output / radiated.
[0014]
FIG. 3 is an explanatory view showing frequency characteristics of the coaxial speaker device
according to the first embodiment. This figure shows the frequency characteristics of the output
sound of the low frequency sound woofer unit 10, the high frequency tweeter unit 11, the bass
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reflex port 13 and the coaxial speaker device 1, and the vertical axis shows the sound pressure of
the output sound. The horizontal axis shows the frequency of the output voice. In the figure,
curve B represents the frequency characteristics of the bass woofer unit 10, curve C represents
the frequency characteristics of the treble tweeter unit 11, and curve D represents the frequency
characteristics of the sound output / emitted by the bass reflex port 13. Represents A curve E
indicated by a broken line represents the frequency characteristics of the sound output from the
coaxial woofer 1, that is, the sound output from the bass woofer unit 10, the high-tone tweeter
unit 11, and the bass reflex port 13 coaxially arranged. .
[0015]
As shown in FIG. 3, the low frequency woofer unit 10 efficiently generates a high sound pressure
in the low frequency range of the audible sound band, in other words, the high sound tweeter
unit 11 causes the low frequency woofer unit 10 to generate a high sound pressure. Outputs /
reproduces the high range that can not be generated with high sound pressure efficiently. Also,
the bass reflex port 13 emphasizes and radiates a resonance frequency specific to itself, which
will be described later, so that the bass region of the frequency where it is difficult for the bass
woofer unit 10 to radiate forward with high sound pressure is sufficient sound pressure Output /
radiate. By disposing the bass reflex port 13 at a position close to the outer peripheral portion of
the bass woofer unit 10, the action of complementing the low-frequency reproduction sound of
the bass woofer unit 10 becomes clearer. As described above, the rear end portion 22 of the rear
cabinet 3 reflects the sound waves of the low frequency range generated by the low frequency
woofer unit 10 by the three-dimensional curved surface, disperses these reflected waves to
prevent interference, and generates standing waves. Reduce
[0016]
The bass reflex port 13 is extended to the inside of the rear cabinet 3 as described above, and
guides the sound wave reflected by the rear end 22 and the like and radiates it from the opening
of the bass reflex port 13. In other words, the low-range reproduction sound is emitted to the
outside of the front baffle 2. Thus, the reproduced sound radiated from the opening of the bass
reflex port 13 suppresses the standing wave which causes the strength of the unnecessary
sound, and therefore, the low frequency that is faithful to the audio signal input to the bass
woofer unit 10 It becomes playback sound. The sound radiated from the bass reflex port 13 is a
sound wave that has traveled into the interior of the rear cabinet 3 due to the vibration of the
cone-shaped diaphragm 10 a of the bass woofer unit 10, that is, a sound wave that travels to the
back side of the bass woofer unit 10 Therefore, the phase of the sound radiated to the front by
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the low frequency woofer unit 10 is inverted. The voice emphasized and emitted from the
opening of the bass reflex port 13, in other words, the resonance frequency of the bass reflex
port 13 is determined by the size and internal volume of the bass reflex port, and the frequency
at which the peak of the curve D shown in FIG. Be done. For example, assuming that the
dimensions of the bass reflex port 13 are 70 mm in depth, 200 [mm <2>] in the opening, and the
internal volume is 0.7 [l], the resonance frequency is 100 [Hz]. The low-frequency sound at or
near this frequency is emphasized.
[0017]
As described above, by providing the bass reflex port 13 so as to be coaxial with the bass woofer
unit 10 and the treble tweeter unit 11, the bass woofer unit and the treble tweeter unit are
coaxial and the bass reflex port is coaxial. The projected area of the front view can be reduced by
about 15% as compared with the case where it is not used. In the coaxial speaker device 1
described here, the external cabinet 3 and the front portion 20 of the substantially conical shape
are configured by the circular front baffle 2, but even when configured by the box-shaped
cabinet, the bass Similar effects can be obtained by coaxially arranging the woofer unit 10 for
high sound, the tweeter unit 11 for high sound, and the bass reflex port 13 in the same manner
as described above, and the external appearance of the coaxial speaker 1 of the present invention
is exemplified here. It is not limited to
[0018]
As described above, according to the first embodiment, the bass reflex port 13 is provided on the
outer periphery of the cone-shaped diaphragm 10a that forms the bass woofer unit 10 so as to
be coaxial with the bass woofer unit 10 and the treble tweeter unit 11 as the sound source. Is
arranged, so that it is possible to output a reproduced sound having a sufficient bass range and
an excellent sense of localization while suppressing the projection area and the appearance size
when viewed from the front.
[0019]
It is a cross-sectional perspective view which shows the structure of the coaxial speaker
apparatus by Embodiment 1 of this invention.
FIG. 1 is an explanatory view showing a configuration of a coaxial speaker device according to a
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first embodiment. FIG. 1 is an explanatory view showing a configuration of a coaxial speaker
device according to a first embodiment. FIG. 5 is an explanatory view showing frequency
characteristics of the coaxial speaker device according to the first embodiment.
Explanation of sign
[0020]
Reference Signs List 1 coaxial speaker device, 2 front baffle, 3 rear cabinet, 10 bass woofer unit,
10a cone diaphragm, 11 treble tweeter unit, 12 support portion, 13 bass reflex port, 20 front
portion, 21 sound radiation hole, 22 rear End, 23 mountings.
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