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JP2008294841

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DESCRIPTION JP2008294841
A speaker system using a passive radiator having a simple structure for suppressing edge
radiation sound distortion and reducing distortion generation due to second harmonics is
obtained. A speaker unit and a passive radiator to which an acoustic signal is input are mounted
on the front face of a passive radiator type cabinet, a passive radiator is used with a diaphragm of
the same shape and size, and a roll edge mounting direction Are a plurality including the
opposite ones, and they are arranged next to each other. [Selected figure] Figure 1
スピーカシステム
[0001]
The present invention relates to a speaker system that suppresses edge radiation noise distortion
that occurs in a passive radiator when the cabinet is a passive radiator system.
[0002]
In recent years, the speaker system has been downsized, but along with this, a system in which a
passive radiator is mounted on a cabinet instead of a bass reflex is widely used as a means to
enhance the low frequency range, and various structures Proposals have also been made (see, for
example, Patent Documents 1 to 3).
As is well known, a passive radiator is basically like a diaphragm of a speaker having no voice
coil for giving an audio signal, and has the same function as a bass reflex type. The equivalent
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mass of the diaphragm of the passive radiator and the air spring inside the cabinet resonate in
the bass region of the speaker (or woofer) attached together in the cabinet and vibrate greatly at
that resonant frequency, and the phase is higher at frequencies above the resonant frequency Go
ahead and, along with the sound waves from the speaker's diaphragm, boost the bass. The shape
of the passive radiator may be a diaphragm of a cone type speaker alone or a diaphragm of a
simple flat surface.
[0003]
The configuration of a conventional passive radiator type speaker system using a flat diaphragm
is shown in FIG. 3 (a) is a cross-sectional view, and FIG. 3 (b) is a front view. In the figure, the
speaker unit 11 to which an acoustic signal is input is attached to the upper opening of the baffle
which is the front plate of the cabinet 100, and the rectangular passive radiator 20 is attached to
the lower opening in a vertically long manner. There is. The passive radiator 20 has a frame 22
screwed to the cabinet 100 and has a structure in which the diaphragm 21 is attached to the
frame 22 via supports 31 and 32 called roll edges surrounding the periphery thereof. Since the
roll edge changes its physical role depending on the signal frequency and has an effect that can
not be ignored on sound, various contrivances have been made to the shape. For example, the
radiation distortion mechanism generated from the edge is considered as the generation cause of
the second harmonic because the amplitude operation at the center of the edge is asymmetric
(see, for example, Non-Patent Document 1). Therefore, in the conventional example of this figure,
the roll edge is formed into two shape parts of the convex roll edge 31 and the concave roll edge
32 so that the direction of the roll edge is vertically asymmetric when viewed from the front of
the cabinet 100. There is. By configuring in this way, the radiation distortion generated at the
edge in the bass range (200 Hz or less) is canceled and the second harmonic is improved.
[0004]
Patent Document 1: Japanese Patent Application Laid-Open No. 11-346395 Patent Document 2:
Japanese Patent Application Laid-Open No. 2003-32775 Patent Document 2: Japanese Patent
Application Laid-Open No. 2005-260625 , Pp. 631-636
[0005]
In a conventional speaker system employing a passive radiator as described in FIG. 3, since a roll
edge having a shape with a different direction from above and below is formed from one roll
edge material, it is subtle so as not to affect the sound. It has to be manufactured taking into
consideration the conditions, and the manufacturing molds required therefor are also expensive.
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[0006]
The present invention has been made to solve the above problems, and it is an object of the
present invention to provide a speaker system using a passive radiator of a simple structure for
suppressing edge radiation sound distortion and reducing distortion due to second harmonics.
With the goal.
[0007]
A speaker system according to the present invention is a speaker system in which a speaker unit
to which an acoustic signal is input and a passive radiator are mounted on the front face of a
passive radiator type cabinet. The passive radiator uses a diaphragm of the same shape and size.
And a plurality of roll edges including the ones attached by reversing the direction of attachment
of the roll edges, and they are arranged adjacent to each other.
[0008]
According to the present invention, the edge radiation sound distortion of the passive radiator
generated at 200 Hz or less is suppressed by using a plurality of passive radiators in which the
mounting direction of the rolling edge is reversed, and the cabinet is a passive radiator system.
Since distortion generation due to the second harmonic can be reduced, a passive radiator can be
manufactured using a rolling edge of a simple structure, and the structure of a mold can be easily
manufactured, and the manufacturing cost thereof It is also possible to make it cheaper.
[0009]
Embodiment 1
FIG. 1 is an explanatory view showing a configuration of a speaker system according to
Embodiment 1 of the present invention, FIG. 1 (a) is a front view, and FIG. 1 (b) is a crosssectional view.
In the figure, for the cabinet 100, for example, a slim shape having a size of 600 × 60 × 80 mm
is used.
A speaker unit 11 to which an acoustic signal is input is attached to the upper opening of the
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baffle which is the front plate, and a plurality of circular diaphragms 21 each having the same
size are attached to the lower opening (in this example Two) passive radiators 201 and 202 are
mounted close to each other in the vertical direction.
The passive radiators 201 and 202 are screwed to the cabinet 100 by a single shared frame 22
in this example.
Seen from the front side of the cabinet 100, the diaphragm 211 of the passive radiator 201 is
attached to the frame 22 via the convex roll edge 31 surrounding its periphery, and the
diaphragm 212 of the other passive radiator 202 is via the concave roll edge 32. Is attached to
the frame 22. The convex roll edge 31 and the concave roll edge 32 are ones formed by the same
mold, and those mounted by inverting the one formed by the same mold when the diaphragm 21
is attached to the frame 22. Here, by arranging the passive radiators 201 and 202 next to each
other, it is possible to improve the second harmonic that is the edge radiation distortion
generated in the resonant frequency band of the passive radiator.
[0010]
FIG. 2 shows measurement data of harmonics and impedance measured in the assembly example
of the speaker system described in FIG. 41 is a primary wave, 42 is a second harmonic, 43 is a
third harmonic, and 44 is an impedance. FIG. 2 (a) shows the measurement results when the roll
edges of the two passive radiators are mounted in the same direction and mounted on the
cabinet 100, and FIG. 2 (b) shows the roll edges of the two passive radiators opposite to each
other. It shows the measurement result in the case of being attached as From this measurement
result, it can be understood that the sound pressure level of the second harmonic 42 near 60 Hz
is reduced by about 10 dB when the passive radiator is inverted. Therefore, the second harmonic
can be improved even if the roll edge of the passive radiator does not have an integrated uneven
structure as shown in FIG.
[0011]
In addition, although the example which made the passive radiator two pieces was demonstrated
in the said example, two or more passive radiators to be used may be sufficient. Moreover,
although the structure which shared the flame ¦ frame 22 was demonstrated in the said example,
you may mount ¦ wear using the flame ¦ frame of the same shape and the same size separately.
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In that case, only one type of diaphragm assembled in the frame with the roll edge attached in
one direction may be made, and the installation direction may simply be reversed for the cabinet,
which facilitates manufacture. Suitable for mass production. The shape of the diaphragms 211
and 212 may not be circular, for example, square.
[0012]
As described above, according to the first embodiment, a plurality of passive radiators are used,
each including a diaphragm having the same shape and the same size, and in which the roll edge
mounting direction is reversed. Are arranged side by side, so that the edge radiation sound
distortion of the passive radiator generated at 200 Hz or less can be suppressed, and the
distortion generation due to the second harmonic can be reduced. Therefore, a passive radiator
can be manufactured using a rolling edge having a simple structure, and the structure of a mold
therefor can be easily manufactured, and the manufacturing cost can be reduced. In the case
where the diaphragm of the passive radiator has a conventional shape as shown in FIG. 3, it is
easily affected by pressure unbalance inside the cabinet, and the displacement of the vibrating
surface is not constant in the sound radiation direction and rolling vibration is likely to occur.
Become. However, in the case of the first embodiment, since a plurality of passive radiators are
provided, each vibrating surface has a small area, so that the pressure unbalance received by
each becomes small, and therefore, the rolling occurring in the bass region is also eliminated. Is
possible.
[0013]
It is explanatory drawing which shows the structure of the speaker system by Embodiment 1 of
this invention. It is explanatory drawing which shows the measurement result of the harmonic of
the speaker system which concerns on Embodiment 1 of this invention. It is an explanatory view
showing the composition of the speaker system of the conventional passive radiator method.
Explanation of sign
[0014]
11 Speaker units, 20 passive radiators, 21 diaphragms, 22 frames, 31 convex roll edges, 32
concave roll edges, 100 cabinets.
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