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JPH03148998

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DESCRIPTION JPH03148998
[0001]
[Industrial Ichon Field 1 This invention relates to an audio reproduction apparatus, and more
particularly, to an audio reproduction apparatus provided with a first speaker and a second
speaker for supporting bass reproduction of the first speaker. is there. [Prior Art] There has been
a complex direct emission type audio reproduction apparatus as an audio reproduction apparatus
capable of performing sufficient bass reproduction with a small speaker cabinet. FIG. 6 is a side
cross-sectional view of a conventional combined direct emission type audio reproduction
apparatus disclosed in Japanese Utility Model Application Publication No. 50-12366. The
combined direct emission type audio reproduction apparatus has a cabinet 1, a first speaker 3
and a second speaker 5. The inside of the cabinet 1 is divided into a first air chamber 9 and a
second air chamber 11 by a partition plate. The cabinet 1 has a side wall provided with an
opening, and the first speaker 3 is attached to the opening. The partition plate 7 is provided with
an opening, and the second speaker 5 is attached to the opening. The resonance frequency
determined by the second speaker 5 and the second air chamber 11 is designed to coincide with
the lowest resonance frequency of the first speaker 3 °. Next, the operation of the combined
direct emission type audio reproduction apparatus shown in FIG. 6 will be described. When the
first speaker 3 is made to emit sound, the second speaker 5 is driven in the same phase as the
first speaker 3. Since the resonance frequency determined by the second speaker 5 and the
second air chamber 11 is designed to coincide with the lowest resonance frequency of the first
speaker 3 itself, the pressure in the first air chamber 9 is There is no change. Therefore, since the
first speaker 3 emits sound without being affected by the volume of the cabinet 1, the first
speaker 3 can perform sufficient bass reproduction even if the cabinet 1 is small. it can. A
combined direct emission voice reproduction device which has the same minimum resonance
frequency as the combined direct emission voice reproduction device shown in FIG. 6 and can
make the cabinet smaller than the composite direct emission voice reproduction device shown in
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FIG. Is disclosed in Japanese Patent Application No. 63-142897. FIG. 7 is a side cross-sectional
view of the combined direct emission type audio reproduction device disclosed in Japanese
Patent Application No. 63-142897. The combined direct emission type audio reproduction
apparatus includes a cabinet 13, a first speaker 16, a speaker 20 of m 2, and a magnetic circuit
unit 23. The side wall of the cabinet 13 has a side wall provided with an opening. The first frame
25 is attached to the side wall provided with the opening.
The first diaphragm 15 is attached to the first frame 25, and the first diaphragm 15 is connected
to the first voice coil 17. A second frame 27 is also attached to the opening provided on the side
wall of the cabinet 13. The second frame 27 is provided with an opening 29. The magnetic circuit
unit 23 is attached to the second frame 27. A second diaphragm 19 is attached to the second
frame 27, and the second diaphragm 19 is connected to the second voice coil 21. The first
speaker 16 is configured of a first diaphragm 15, a first voice coil 17, and a magnetic circuit unit
23. The second speaker 20 is composed of the second diaphragm 19, the second voice coil 21,
and the magnetic circuit unit 23. The composite direct emission type audio reproduction
apparatus shown in FIG. 7 shares the magnetic circuit portion of the first speaker 16 and the
magnetic circuit portion of the second speaker 20. Therefore, even if the cabinet is smaller than
the cabinet of the complex direct emission type audio reproduction apparatus shown in FIG. 6,
the lowest resonance frequency should be the same as the lowest resonance frequency of the
complex direct emission type speech reproduction apparatus shown in FIG. it can. [Problem to be
Solved by the Invention 1] The combined direct emission type audio reproduction apparatus
shown in FIG. 7 drives the first speaker 16 and the second speaker 20 in the same phase.
However, since the first diaphragm 15 and the second diaphragm 19 are separated, the phase of
the sound radiated from the first speaker 16 and the phase of the sound radiated from the
second speaker 20 deviate. Since the bass has a long wavelength, this phase shift is not a
problem. However, since the high sound has a short wavelength, depending on the frequency, the
phase of the sound emitted from the first speaker 16 and the phase of the sound emitted from
the second speaker 20 are reversed, and the radiation from the first speaker 16 is emitted. And
the sound radiated from the second speaker 20 cancel each other out, and the sound pressure
frequency characteristic of the first speaker 16 is disturbed. The same problem occurs in the
complex direct emission sound reproducing apparatus shown in FIG. The present invention has
been made to solve such conventional problems. An object of the present invention is to provide
an audio reproduction apparatus having a structure capable of reducing the disturbance of sound
pressure frequency characteristics. [Means for Solving the Problems] The audio reproduction
device is provided with first and second speakers. The second speaker supports bass
reproduction of the first speaker. The sound reproducing apparatus according to the present
invention divides the vibrating portion of the second speaker into a plurality of portions, places
the plurality of divided portions apart and arranges the gaps, and among the vibrations for
moving the vibrating portion, the height is high. A voice reproduction device according to the
present invention divides the vibration portion of the second speaker into a plurality of parts, and
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a plurality of divided parts are provided. Since the vibration absorbing member for absorbing the
vibration corresponding to the high range is provided in the gap, the high sound is attenuated
and reproduced from the second speaker.
That is, since the bass is low in frequency, when one part of the divided vibration part vibrates,
the vibration absorbing member also vibrates the same and transmits the vibration to the other
part. On the other hand, since the high sound has a high frequency, even if one part of the
divided vibration part vibrates, the vibration absorbing member acts as a so-called spring and
absorbs the vibration, and the vibration is Tell the part in a dampened form. Examples of the
vibration absorbing member that can be used in the present invention include a coil spring and a
visco-elastic body. Examples of the visco-elastic body include cloth, foamed plastic, rubber and
the like. The vibrating portion referred to here includes a diaphragm and a voice coil. [First
Embodiment] A first embodiment of an audio reproduction apparatus according to the present
invention will be described with reference to FIG. The difference between the first embodiment of
the present invention shown in FIG. 1 and the prior art shown in FIG. 7 is that, as shown in FIG. 1,
the second diaphragm 19 and the second voice coil 21 are separated. In this case, the second
diaphragm 19 and the second voice coil 21 are connected by the visco-elastic body 31. The other
structure is the same as that of the first embodiment shown in FIG. 1 and the conventional
example shown in FIG. The members shown by numbers in FIG. 1 and the members shown by
numbers in FIG. 7 are the same members if the numbers are the same. Next, the operation of the
first embodiment of the sound reproducing apparatus according to the present invention shown
in FIG. 1 will be described. When the bass is reproduced, since the second voice coil 21 vibrates
slowly, the visco-elastic body 31 operates as a simple mass, and the vibration of the second voice
coil 21 is directly transmitted to the second diaphragm 19. The second diaphragm 19 reproduces
low tones. When playing a high-pitched sound, since the second voice coil 21 vibrates fast, the
visco-elastic body 31 operates as a spring, absorbs the vibration of the second voice coil 21, and
transmits it to the second diaphragm 19. Reduce the vibration. Therefore, since the high sound is
reproduced from the second diaphragm 19 with the sound pressure level attenuated, the sound
reproduced from the second diaphragm 19 and the sound reproduced from the first diaphragm
15 Will not interfere with each other and cancel each other. Therefore, according to the first
embodiment of the audio reproduction device according to the present invention, the disturbance
of the sound pressure frequency characteristic of the sound reproduced from the first speaker 16
can be reduced. Second Embodiment A second embodiment of the audio reproduction apparatus
according to the present invention will be described with reference to FIG. The difference
between the first embodiment shown in FIG. 1 and the second embodiment shown in FIG. 2 is
only the attachment position of the visco-elastic body 31.
Therefore, description of structures other than the attachment position of the visco-elastic body
31 is omitted. The members indicated by numbers in FIG. 2 and the members indicated by
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numbers in FIG. 1 indicate the same members if the numbers are the same. In the second
embodiment of the voice reproducing apparatus according to the present invention, as shown in
FIG. 2, the second voice coil 21 is divided into two, and the divided second voice coils are
arranged separately and divided. One part and the other part were connected by the visco-elastic
body 31. (Third Embodiment M) The third embodiment of the audio reproduction device
according to the present invention will be described with reference to FIG. The difference
between the first embodiment shown in FIG. 1 and the third embodiment shown in FIG. 3 is only
the attachment position of the visco-elastic body 31. Therefore, the description of the other
structures is omitted. The members shown by the numbers in FIG. 3 and the members shown by
the numbers in FIG. 1 are the same members if the numbers are the same. The third embodiment
of the audio reproduction device according to the present invention, as shown in FIG. 3, divides
the second diaphragm 19 into two and arranges one divided portion and the other portion apart.
The one divided part and the other part are connected by the visco-elastic body 31. Fourth
Embodiment A fourth embodiment of the audio reproduction device according to the present
invention will be described with reference to FIGS. 4A and 4B. The difference between the fourth
embodiment shown in FIG. 4A and the first embodiment shown in FIG. 1 is only in the method of
attaching the visco-elastic body 31. Therefore, the description of the other structure of the fourth
embodiment is omitted. The members indicated by numbers in FIGS. 4A and 4B and the members
indicated by numbers in FIG. 1 are the same members if the numbers are the same. m4ArI!
As shown in FIG. J, in the fourth embodiment of the audio reproduction device according to the
present invention, the second diaphragm 19 and the second voice coil 21 are disposed
separately, and the viscoelastic body 31 is disposed in the gap. did. The visco-elastic body 31 is
fixed to the second voice coil 21 but is not fixed to the second diaphragm 19. In the gap 33,
when the second voice coil 21 vibrates in low frequency reproduction at rated human power, the
visco-elastic body 31 is in contact with the second diaphragm 19, and the second voice coil 21 is
high-pitched reproduction In the case of vibration, the size of the visco-elastic body 31 is set so
as not to contact the second diaphragm 19. An example of the size of the gap 33 is such that the
viscoelastic body 31 contacts the second diaphragm 19 up to 2fo (fo is the lowest resonant
frequency). The reason is that 2 (o is taken at a frequency of 2 fo or more, because the amplitude
decreases, and hence the visco-elastic body 31 is difficult to contact the second diaphragm 19.
In the fourth embodiment of the audio reproduction device according to the present invention,
since the gap 33 as described above is provided, even when the second voice coil 21 vibrates as
shown in FIG. 4A at the time of high-pitched sound reproduction. The visco-elastic body 31 is not
in contact with the second diaphragm 19, and the high frequency sound is not reproduced from
the second diaphragm 19. At the time of bass reproduction, as shown in FIG. 4B, the vibration of
the second voice coil 21 is transmitted to the second diaphragm 19 via the visco-elastic body 31,
and the bass reproduction is performed from the second diaphragm 19. Is done. In addition,
various things can be considered as a shape of a viscoelastic body. An example of the shape of
the viscoelastic body will be described with reference to FIGS. 5A to 5D. The shape of the visco-
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elastic body 31 shown in FIGS. 5A and 5B is a shape corresponding to one portion when the
cylinder is divided in half. The shape of the visco-elastic body 31 shown in FIG. 5C is a plate-like
shape whose surface is corrugated. The shape of the visco-elastic body 31 shown in FIG. 5D is a
plate-like shape having a flat surface. Even if the visco-elastic body is attached to the second
speaker 5 of the sound reproducing apparatus shown in FIG. 6, the effect of the present
invention is that the sound reproducing apparatus according to the present invention has a
plurality of vibration parts of the second speaker Divided into a plurality of divided parts, and
arranged in a separated space, and a vibration absorbing member for absorbing vibration
corresponding to a high range is provided in the gap, so that the second speaker reproduces in
the form of high sound being attenuated. Be done. Therefore, at the time of high-pitched sound
reproduction, the sound reproduced from the first speaker and the sound reproduced from the
second speaker interfere with each other, the sound reproduced from the first speaker becomes
small, and the sound from the first speaker The pressure frequency characteristic is not
disturbed.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a side cross-sectional view of a first embodiment of an audio reproduction apparatus
according to the present invention.
FIG. 2 is a side cross-sectional view of a second embodiment of the audio reproduction device
according to the present invention. FIG. 3I is a side cross-sectional view of a third embodiment of
the audio reproduction device according to the present invention. FIGS. 4A and 4B are side crosssectional views of a fourth embodiment of the audio reproduction device according to the
present invention. 5A to 5D are diagrams showing the shape of the viscoelastic body. FIG. 6 is a
side sectional view showing an example of a conventional audio reproduction apparatus. 7th v! J
is a side sectional view showing another example of the conventional audio reproduction device.
In the figure, 15 is a diaphragm, 16 is a first speaker, 17 is a first voice coil, 19 is a second
diaphragm, 20 is a second speaker, 21 is a second voice coil, 31 is a viscoelastic body Is shown.
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