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DESCRIPTION JP2000125379

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DESCRIPTION JP2000125379
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic device in which a speaker unit is integrally formed.
[0002]
2. Description of the Related Art FIG. 15 shows a conventional cassette tape recorder with CD.
The cabinet 1 is configured by combining the upper cabinet 1a and the lower cabinet 1b, and
assembling the right port member 2R and the left port member 2L on both sides of the front
surface of the cabinet 1.
[0003]
Inside the cabinet 1, as shown in FIG. 16, a right speaker space 4R and a left speaker space 4L
which are separated by the partition walls 3a and 3b and which are independent of each other
are formed. The left speaker 5L is attached so that the right speaker 5R is located in the left
speaker space 4L so as to be located. 6R is a sound emission opening of the right speaker formed
in the upper cabinet 1a, and 6L is a sound emission opening of the left speaker formed in the
upper cabinet 1a.
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[0004]
Although not shown, a compact disc (hereinafter referred to as a CD) mechanism, a cassette
mechanism, a power supply unit, etc. are assembled in the space 8 between the right speaker
space 4R and the left speaker space 4L inside the cabinet 1. It is configured.
[0005]
In such a conventional configuration, a mid-high range sound is output from the outlet 6R of the
upper cabinet 1a, and a mid-high range sound is output from the outlet 6L of the upper cabinet
1a. Ru.
The low band of the right channel is output from the port opening 9a by the bass reflex structure
of the right port member 2R, and the low band of the left channel is output from the port
opening 9b by the bass reflex structure of the left port member 2L.
[0006]
In order to increase low-range sound, it is necessary to increase the volume of the right speaker
space 4R and the left speaker space 4L and to increase the output of the right speaker 5R and
the left speaker 5L. It is common to grow.
[0007]
However, in recent years, there are restrictions such as the size reduction of the acoustic device
and the arrangement of the internal configuration, and it may be difficult to secure a sufficient
space.
An object of the present invention is to provide an acoustic device capable of obtaining a lowpass component that is more powerful than before even with a space-saving size.
[0008]
The acoustic device of the present invention is provided with a resonant space calculated to
resonate at a target frequency in a cabinet, an auxiliary speaker is provided to output sound to
the resonant space, and resonance of the resonant space is achieved. It is characterized in that it
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is configured to generate a sound.
[0009]
According to the present invention, it is possible to obtain a low-pass component that is more
powerful than before even with a space-saving size.
[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the audio apparatus according
to the first aspect of the present invention, a speaker space is formed in the interior of a cabinet,
and the speaker is attached to the speaker space. A resonance space calculated to resonate at a
frequency is connected, and an auxiliary speaker is attached separately from the speaker to
output sound to the resonance space, and the resonance sound of the resonance space is guided
to the outside of the cabinet It is characterized by having done.
[0011]
The acoustic device according to claim 2 forms an independent speaker space on the left and
right inside the cabinet, and the speaker is attached to each speaker space, wherein the cabinet is
independent of the speaker space and resonates at a target frequency. To connect the resonance
spaces calculated as described above and attach an auxiliary speaker separately from the
speakers so as to output sound to the resonance space, and to guide the resonance sound of the
resonance space to the outside of the cabinet It features.
[0012]
The acoustic device according to claim 3 is characterized in that in claim 1 and claim 2, the
resonance space is a closed space and is on the back side of the cabinet.
According to a fourth aspect of the present invention, in the second aspect, the resonance space
is formed at the center on the back side of the cabinet, and the resonance sound of the resonance
space is disposed via a duct disposed across the speaker space of the cabinet. It is characterized
in that it is output from both sides of the front of the cabinet.
[0013]
In the sound device according to the fifth aspect of the present invention, in any of the first to
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fourth aspects, the auxiliary chamber constituting a part of the resonance space is formed by
projecting the back from the back of the cabinet to the outside, and the auxiliary speaker is
provided inside the cabinet. It is characterized in that it is arranged to attach the front of the
auxiliary speaker to the auxiliary room and attach it so that the sound of the back of the auxiliary
speaker is guided to the outside of the cabinet.
[0014]
Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 to 14.
The same reference numerals are given to components having the same functions as those in
FIGS. 15 and 16 showing the conventional example.
[0015]
The cassette tape recorder with CD according to the present invention has a woofer speaker
space 10 and a woofer speaker space 10 separately from the inside of a cabinet 1 having a right
speaker space 4R and a left speaker space 4L as shown in FIG. A right duct 11R and a left duct
11L for guiding the sound to the front side of the cabinet 1 are formed.
[0016]
Specifically, as shown in FIGS. 2 and 3 at the rear of the lower cabinet 1b, a first recess 13 in
which the rear of the auxiliary speaker 12 is stored, and a first recess 13 adjacent to the first
recess 13 Is separated by the partition 14 and not in communication, and the right speaker space
4R is partitioned by the partition 16 and surrounded by the partition 16 and the rear wall 17 of
the lower cabinet 1b. A third recess 19 is formed communicating with the through hole 18
shown in FIG.
[0017]
The auxiliary speaker 12 is attached to the woofer receiver 20 which is attached to the rear of
the lower cabinet 1 b and closes the opening of the first recess 13.
The woofer receiving container 20 is connected to a closing plate 21 for closing the opening of
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the second recess 15, and the woofer receiving container 20 has a predetermined volume at the
front of the auxiliary speaker 12 attached thereto. An auxiliary chamber 22 is formed, and the
auxiliary chamber 22 is formed with a communication hole 23 communicating with the second
recess 15 in a state where the woofer receiver 20 is attached to the lower cabinet 1 b.
[0018]
Furthermore, the upper opening of the third recess 19 formed in the lower cabinet 1b is a state
where the lower cabinet 1b and the upper cabinet 1a are united to form the cabinet 1, as shown
by a phantom line in FIG. The upper cabinet 1a is closed in communication with the inside of the
recess 24 partitioned by the partition wall.
[0019]
Inside the right speaker space 4R and the left speaker space 4L, at positions outside the right
speaker 5R and outside the left speaker 5L, as shown in FIG. 2 and FIG. 6, the respective speaker
spaces 4R and 4L The divided cylindrical vertical ducts 25R and 25L are integrally formed with
the lower cabinet 1b.
[0020]
At the bottom of the lower cabinet 1b, as shown in FIG. 7, the groove 26a for communicating the
lower end of the vertical duct 25R with the first recess 13 and the lower end of the vertical duct
25L with the first recess 13 are communicated. The groove 26b is integrally formed with the
lower cabinet 1b.
[0021]
The openings of the grooves 26a and 26b are closed by groove lids 27a and 27b screwed to the
lower cabinet 1b as shown in FIG. 8, and the duct 11R for communicating the vertical duct 25R
and the first recess 13 with each other. The duct 11L is configured to communicate the vertical
duct 25L with the first recess 13.
In FIG. 6, 28a represents a communication hole between the first recess 13 and the duct 11R,
and 28b represents a communication hole between the first recess 13 and the duct 11L.
[0022]
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The right port member 2R shown in FIG. 10 is attached to the right of the front of the lower
cabinet 1b before the upper cabinet 1a is assembled.
At the mounting position of the right port member 2L of the lower cabinet 1b, as shown in FIG.
11, notches 30a to 30d are formed, with which the hooks 29a to 29d formed on the lower side of
the right port member 2R engage.
In the assembling operation, the hooks 29a to 29d of the right port member 2R are engaged with
the notches 30a to 30d of the lower cabinet 1b, and the lower side of the overhang 31 of the
lower cabinet 1b is hidden as shown in FIGS. When turned, the base end 33 of the horn 32 of the
right port member 2R is communicated with the upper end opening 34 of the vertical duct 25R.
In this state, the projection 36 formed at the tip of the vertical duct 25R engages with the hole
37 at the proximal end of the horn 32 of the port member 2R and is positioned.
[0023]
Next, the flange portion 35 of the right port member 2R and the attachment hole 38 at the base
end of the horn 32 are screwed to the lower cabinet 1b to complete the assembly of the right
port member 2R.
[0024]
The assembly to the lower cabinet 1b of the left port member 2L is configured in the same
manner as described above, and the base end of the horn of the left port member 2L is
communicated with the upper end of the vertical duct 25L.
FIG. 9 shows this state of communication.
[0025]
With this configuration, the upper cabinet 1a has the lower cabinet 1b assembled with a CD
mechanism, a tape recorder mechanism and a power supply unit, the lower cabinet 1b has a
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woofer receiver 20 attached to the rear, and the right speaker 5R and left speaker 5L assembled
Are combined to constitute the cabinet 1, the auxiliary chamber 22 of the woofer receiver 20, the
communication hole 23, the second recess 15 and the third recess 19 of the lower cabinet 1b,
and the front surface side of the auxiliary speaker 12 A sealed resonant space 39 surrounded by
the recess 24 of the upper cabinet 1a is formed.
[0026]
A right channel signal and a left channel signal are supplied to the right speaker 5R and the left
speaker 5L for driving, and a monaural component of the right channel signal and the left
channel signal is combined with the auxiliary speaker 12 or a right channel signal and a left
channel signal are combined. Supply and drive the ingredients.
[0027]
Then, the sound of the right channel is outputted from the sound emission port 6R of the upper
cabinet 1a and the port 7R for bass reflex, and the sound of the left channel is outputted from the
sound emission port 6L of the upper cabinet 1a and the port 7L for bass reflex From the member
2R and the port openings 40a and 40b of the left port member 2L, a low-pass component larger
than the conventional one is generated by the following mechanism.
[0028]
The sound generated from the auxiliary speaker 12 resonates in the resonance space 39 at a low
frequency target frequency determined by the volume of the resonance space 39, and the sound
pressure level of the component of the target frequency is enhanced.
[0029]
This low frequency target frequency sound is supplied from the resonance space 39 to the right
port member 2R through the first recess 13 of the lower cabinet 1b, the duct 11R, and the
vertical duct 25R, and the horn opening 40a provides the outside of the cabinet 1 Output to
[0030]
Further, the resonance space 39 is supplied to the left port member 2L through the first recess
13 of the lower cabinet 1b, the duct 11L and the vertical duct 25L from the resonance space 39,
and is output to the outside of the cabinet 1 from the horn opening 40b.
[0031]
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In this embodiment, the auxiliary speaker 12 and the single resonance space 39 are formed
without increasing the volume of the right speaker space 4R and the left speaker space 4L and
increasing the output of the right speaker 5R and the left speaker 5L. Can increase the sound
pressure level in the low range.
[0032]
Moreover, a small space which can be formed in each part is skillfully connected with a
communicating hole over a part of the lower cabinet 1b, a part of the upper cabinet 1a, and the
auxiliary chamber 22 of the woofer receiving container 20 A large-volume resonant space 39 is
formed to make it possible to adjust the resonant frequency to a low frequency, which also
contributes to space saving.
[0033]
Also, as seen in FIG. 1, the frontal side of the auxiliary speaker 12 is directed to the resonance
space 39, and most of the auxiliary speaker 12 is in the space between the right speaker space
4R and the left speaker space 4L. Since it accommodated in, the protrusion amount of the woofer
receptacle container 20 to the back side of the cabinet 1 was able to be reduced.
[0034]
Further, as shown in FIG. 9, the groove lids 27a and 27b for closing the grooves 26a and 26b of
the lower cabinet 1b are projections formed in a circular arc shape in which the inside of the
duct is smooth at the corner portions of the ducts Since the corner portions that change the
direction of the passage from horizontal to vertical are formed into a smooth arc surface instead
of an acute angle by forming 41, the sound is reflected to the side of the first recess 13 at this
portion, The reduction in sound pressure level passing through can be greatly reduced, which
also contributes to the enhancement of the low range.
[0035]
The resonance frequency determined by the length and cross sectional area of the ducts 11R and
11L and the volume of the woofer speaker space 10 is set to be equal to or near the resonance
frequency of the resonance space 39, and a general bass reflex The part of the ducts 11R, 11L
can be called a resonant port as seen in the
[0036]
Further, the resonance space 39 is formed at the center on the back side of the cabinet 1, and the
duct of the cabinet 1 is formed of a horn of port members 2R, 2L disposed across the speaker
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spaces 4R, 4L of the cabinet. Since output is made from both sides of the front, this also
contributes to space saving size.
[0037]
In the above embodiment, a part of the resonance space 39 is formed in the woofer receiving
container 20 protruding to the outside of the cabinet 1 and the whole of the auxiliary speaker 12
is provided inside the cabinet 1. It is also possible to implement the reverse case in which the
auxiliary speaker 12 is provided in the inside and part or all of the auxiliary speaker 12 is
accommodated in a container projecting to the outside of the cabinet 1.
[0038]
In the above embodiment, the resonance space 39 is a sealed space having an opening only at
the attachment portion of the auxiliary speaker 12, but it may have an opening in part if it
resonates in a low region.
[0039]
As described above, according to the present invention, in the acoustic device in which the
speaker space is formed inside the cabinet and the speaker is attached to the speaker space, the
speaker space is independent of the cabinet and the resonance occurs at the target frequency.
And the auxiliary speaker is attached separately from the speaker so as to output sound to the
resonance space, and the resonance sound of the resonance space is guided to the outside of the
cabinet, so that resonance is generated. By effectively utilizing the resonance effect of the space,
it is possible to obtain a low-pass component having a space-saving size and more powerful than
before, without increasing the volume of the speaker space and the output of the speakers as in
the conventional case. It is possible to
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