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JPH1145093

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DESCRIPTION JPH1145093
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
noise reduction device for reducing noise by adding artificially created sound waves to the noise.
[0002]
2. Description of the Related Art Conventionally, as noise sources in office environments, there
are operating noises and blowing noises generated by office automation equipment such as
copying machines installed and used in offices, and noise reduction is required. . In order to
reduce the noise, passive means such as improvement of the structure and material of the
working part and the casing, and application of sound absorbing material have been used. In
order to prevent the noise of the OA device from leaking out, it is desirable to wrap the entire
device with an outer covering such as a soundproof material. However, in an OA apparatus such
as a copying machine, an opening for taking in and out the cooling air is provided in order to
prevent the temperature rise inside the apparatus, and noise may leak from the opening. In the
conventional office automation equipment as well, noise that constantly leaks from the opening
is regarded as the first problem.
[0003]
Further, as disclosed in Japanese Patent Application Laid-Open No. 5-142887, active noise
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reduction of OA equipment is also performed. This is because detectors such as an acceleration
sensor and a microphone are provided near noise sources such as fans and motors in the device,
and antiphase sound generated using an adaptive algorithm or antiphase sound generation
algorithm is used inside or outside the device. It radiates from actuators, such as a speaker
provided, and reduces by combining with a noise.
[0004]
However, in the prior art described above, when a noise reduction device is added to an OA
apparatus, a detector, a circuit equipped with an antiphase sound generation algorithm, an
actuator emitting an antiphase sound It is necessary to secure the installation space of the above,
or secure the space for the duct formation for efficiently reducing the noise. Therefore, in order
to be mounted on a new model of OA equipment, the new design of the casing or the
arrangement of the internal mechanism taking into consideration the securing of a space for
realizing the mounting space and the efficient noise reduction etc. Similarly, it is necessary to reexamine the housing redesign and the layout change of the internal mechanism, which
complicates the development problem, prolongs the development period, complicates the chassis
shape and the internal mechanical layout, and increases the cost. Do.
[0005]
When a noise reduction device is newly installed inside a device that has been shipped and is
already in use or a device that will be shipped in the future, it is impossible to change the chassis,
and it is very difficult to secure a mounting space. It is virtually impossible to add a noise
reduction device. Even if it can be mounted, the cost for development and the cost such as the
number of mounting steps are increased. In addition, it is necessary to secure a space for heat
radiation around the opening of the OA device, and this space is normally used only for heat
radiation, which is a wasteful space.
[0006]
The object of the present invention is to effectively use the space left only for heat dissipation
without taking into consideration the change of the case and the mounting space in the case,
even in the devices shipped and already used or the devices to be shipped from now on It is
possible to easily add the noise reduction device to the outside of the OA device by utilizing it,
and to reduce the noise of the device.
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[0007]
SUMMARY OF THE INVENTION According to the present invention, there are provided an
opening window corresponding to the opening of a noise generating device, a duct which is
continuous with the opening window and is also opened to the outside and conducts noise and
air flow. A detection means for detecting the sound wave in the duct and converting the sound
wave into a signal; and an anti-phase sound generation unit for generating a cancellation sound
wave of the opposite phase to the noise to cancel the noise based on the signal output from the
detection means And an additional sound source which radiates the canceling sound wave into
the duct and superposes it on the noise, and is attached to the outside of the device generating
the noise to reduce the noise.
[0008]
In addition, it is characterized in that it is mounted in a space for cooling around the opening of
the device that generates noise.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
First Embodiment FIG. 1 is an explanatory view of a first embodiment, and FIG. 2 is a perspective
view of the first embodiment.
In the figure, 1 is a noise reduction device of this embodiment, and is formed of a material having
soundproofing, sound absorbing and vibration proofing characteristics.
2 shows a substrate. The reference numeral 3 denotes an opening window, which corresponds to
the opening of an OA device described later.
[0010]
Reference numerals 4a to 4d denote sensor microphones as first detection means, which detect
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noise and convert it into an electric signal. Reference numerals 5a to 5d denote antiphase sound
generation units, which generate canceling sound waves having the same amplitude as the noise
in the opposite phase based on the output signals from the sensor microphones 4a to 4d.
Reference numerals 6a to 6d denote additional sound sources, which are, for example, speakers
and the like, and radiate the cancellation sound waves.
[0011]
Reference numerals 7a to 7d denote error microphones as second detection means, which input
a synthetic sound of noise and a canceling sound wave as an error signal to the antiphase sound
generation units 5a to 5d. The antiphase sound generators 5a to 5d are equipped with, for
example, an adaptive control algorithm for updating the output signal so as to minimize the error
signal. However, the present invention is not limited to the adaptive control algorithm, and
another algorithm may be used as long as it can generate an appropriate cancellation sound
wave.
[0012]
8a-8d are storage bodies, and store anti-phase sound generation units 5a-5d. Grooves are formed
between the storage bodies 8a to 8d, and each groove communicates with the opening window 3
and also communicates with the outer side of the noise reduction device 1, and the surfaces of
the storage bodies 8a to 8 have By contacting an office wall or the like, the grooves are covered
to form ducts a to d.
[0013]
The sensor microphones 4a to 4d, the antiphase sound generation units 5a to 5d, the additional
sound sources 6a to 6d and the error microphones 7a to 7d are provided corresponding to the
ducts a to d, and the sensor microphones 4a to 4d are open. It arranges in ducts ad so that the
noise from the part 3 can be detected, the additional sound sources 6a-6d are arrange |
positioned outside it from this, and error microphones 7a-7d are arrange | positioned further
outside. The anti-phase sound generation units 5a to 5d are accommodated in the
accommodation units 8a to 8d which are in proximity to each other.
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[0014]
FIG. 3 is an explanatory view (1) of a use example of the first embodiment, and FIG. 4 is an
explanatory view (2) of a use example of the first embodiment. In these figures, reference
numeral 9 denotes an office automation apparatus such as an office copying machine or a
facsimile machine, which has an opening 10 for taking in and out the cooling air. In many cases,
the OA device 9 is installed in proximity to the wall surface 11 of the office, but at that time, in
order to ensure the continuity of the cooling air, the OA device 9 is installed so as to make a gap
12 for heat radiation with the wall surface 11 There must be. For example, several cm to several
tens cm are secured as the gap 12, but this varies depending on the type and specification of the
OA device 9.
[0015]
In the present embodiment, the noise reduction device 1 is provided such that the opening
window 3 thereof matches the opening 10 of the OA device 9 so that the noise reduction device
1 can be accommodated in the space 12 with the wall surface 11. is there. In addition, the noise
reduction apparatus 1 has a double-sided tape, a hook, etc. which are not shown in figure, and is
closely_contact | adhered to OA apparatus 9 using these. An anti-vibration material for
preventing transmission of vibration is attached to the surface opposite to the surface closely
attached to the OA device 9, that is, the surfaces of the storage bodies 8 a to 8 d, and is installed
in close contact with the wall surface 11. . By installing in this way, the groove and the wall
surface 11 form ducts a to d.
[0016]
The operation of this embodiment will be described below. As described above, in the figure, each
component is given a combination of numerals and alphabets (a to d) and symbols are attached,
the same numerals indicate the same components and functions, and the same alphabets are the
same set It shows that it belongs to Since each of the sets a to d has the same function and
operation, the following description will be mainly made only for the a set, but the other sets are
also the same.
[0017]
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While the OA device 9 is in operation, a fan for taking in and out the cooling air always operates,
and while the cooling air flows in and out from the opening 10, operating noise of the OA device
9 and wind noise of the fan are emitted as noise. . The radiated cooling air and noise enter the
noise reduction device 1 through the opening window 3 and are discharged to the outside of the
device through the duct a formed as described above. The cooling air and noise are discharged to
the outside of the apparatus through the duct a with the opening window 3 side as the upstream
and the error microphone 7 a side as the downstream.
[0018]
The cooling air discharged into the duct a is taken in and out through the duct a. The noise is
detected from the sensor microphone 4a and input to the antiphase sound generation unit 5a,
and the antiphase sound generation unit 5a creates a canceling sound wave having the same
amplitude in the reverse phase as the noise detected by the sensor microphone 4a. Radiate. The
error microphone 7a inputs the synthetic sound of the noise and the canceling sound wave from
the additional sound source 6a as an error signal to the antiphase sound generation unit 5a. The
anti-phase sound generation unit 5a updates the output signal so that the error signal is
minimized, for example, by an adaptive control algorithm. The cancellation sound wave emitted
from the additional sound source 6a reduces the noise by being combined with the noise in the
duct a.
[0019]
The above operation is similarly performed for the sets b to d, and the cooling air emitted by the
OA device 9 from the opening 10 is taken in and out of the apparatus through the ducts a to d as
it is, but the noise passes through the ducts a to d It is reduced by being combined with the
canceling sound wave on the way. That is, although the cooling air which the OA device 9
discharges from the opening 10 is taken in and out of the device as it is, the noise is reduced by
the noise reduction device 1.
[0020]
FIG. 5 is an explanatory view of a modified example of the first embodiment. In the above
description, an example in which a total of four ducts are formed at the top, bottom, left, and
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right of the opening 10 of the OA device 9 has been described. However, without limitation
thereto, as shown in FIG. It can also be formed. Furthermore, depending on the size and position
of the opening, or in order to obtain higher noise reduction performance, the shape, size,
direction or number of the duct may be changed as necessary.
[0021]
Assuming that the noise reduction device is provided inside the OA device, the detector, the
circuit equipped with the antiphase sound generation algorithm, the space for the actuator
emitting the antiphase sound, and the duct formation for efficiently reducing the noise It is
necessary to secure space for the new design of the case or arrangement of the internal
mechanism in consideration of these. In addition, it is necessary to re-examine the design and the
arrangement change of the internal mechanism, etc. when designing the case for the same reason
for the same reason as the successor model, resulting in complication of development issues,
extension of development period, housing shape and internal mechanism arrangement. Although
complexity, cost increase, etc. occur, in the present embodiment, since it is configured to be
attached to the outside of the OA device, all these problems are solved.
[0022]
Further, in the present embodiment, regardless of whether the OA device is new or old, the noise
reduction device is attached to the side surface of the OA device and a plurality of ducts are
provided on the side surface of the OA device by simple work It is possible to reduce the noise
emitted from the opening of the OA equipment by using the duct. Although the OA device has an
opening for heat radiation on its side, in order to conduct air using a fan or the like, a space must
be left between the wall and the wall at the time of installation. The noise reduction device of the
present embodiment can be installed by effectively utilizing the space. Therefore, although it is
configured to be attached to the outside of the OA device, no extra space is required.
[0023]
In the above description, although the microphone is described as an example of the means for
detecting the sound wave, any sensor that can detect sound and vibration and can obtain an
appropriate signal for the algorithm to be used may be used. It may be used, and its type,
performance and number can be arbitrarily set. Further, although the speaker has been described
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as an additional sound source for generating the canceling sound wave, the type, performance,
and number can be arbitrarily set as long as the actuator can generate sound and vibration and is
suitable for the algorithm used.
[0024]
Second Embodiment In the configuration of the first embodiment, the second embodiment is
characterized in that a flow dividing portion described later is provided. FIG. 6 is an explanatory
view of the second embodiment, and FIG. 7 is a perspective view of the second embodiment.
Reference numeral 13 in this figure denotes a diverting portion, which is formed, for example, by
crossing two plates having soundproofing, sound absorbing and vibration-proofing
characteristics with a cross near the center, etc., and an opening window in the configuration of
the first embodiment. Arrange in part 3.
[0025]
Thus, the noise reduction device 14 of the present embodiment is configured. The other
components, structure, installation manner and operation for noise reduction are the same as
those of the first embodiment. The noise and the cooling air discharged from the opening 10 of
the OA device 9 and sent into the noise reduction device 14 from the opening window 3 are
divided by the flow dividing portion 13 and guided to the ducts a to d. The cooling air guided into
the ducts ad is taken in and out through the ducts ad, but the noise is combined with the
canceling sound waves emitted from the additional sound sources 6a to 6d in the ducts ad and
reduced. . That is, although the cooling air which the OA device 9 discharges from the opening
10 is taken in and out of the device as it is, the noise is reduced by the noise reduction device 14.
[0026]
In this manner, noise and cooling air discharged from the opening 10 of the OA device 9 are
divided by the flow dividing portion 13 and divided to equalize the amount of noise and the
amount of cooling air guided to the ducts a to d or Alternatively, distribution can be performed
according to the processing capacity of each of the ducts a to d, and the noise reduction
efficiency can be further improved, and the noise reduction device 14 having a higher heat
dissipation effect can be realized.
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[0027]
The diverting part is not limited to the shape in which the two plates are combined in a cross
shape, and is suitable for dividing the cooling air or the noise according to the number and shape
of the ducts and the structure of the opening window. Any shape may be used as long as it has a
different shape.
[Third Embodiment] The present embodiment is characterized in that in the configuration of the
first embodiment, a duct forming plate to be described later is provided.
[0028]
FIG. 8 is an explanatory view of the third embodiment. In the figure, reference numeral 15
denotes a duct forming plate, which is made of a material having soundproofing, sound
absorbing and vibration-proofing properties, arranged parallel to the substrate 2 on the surface
of the housings 8a to 8d in the configuration of the first embodiment. Form ducts ad. Thus, the
noise reduction device 16 of the present embodiment is configured. The other components,
structure, installation manner and operation for noise reduction are the same as those of the first
embodiment.
[0029]
When installing the OA equipment 9 near the center of the office, etc., when using the noise
reduction device 16 provided with the duct forming plate 15 described above, without using the
wall, the arrangement is made not to approach the wall surface. Ducts a to d can be formed. This
makes it possible to freely arrange the OA device 9 and the like. In addition, it can also be set as
the structure which added the flow dividing part 13 of 2nd Embodiment to the noise reduction
apparatus 16 of this Embodiment.
[0030]
As described above in detail, any device can be installed without modifying the device by
attaching it to the outside of the device corresponding to the opening of the device that
generates noise. Also, it has an effect of being able to reduce noise while sufficiently securing the
inside of the device by simply attaching it.
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[0031]
In addition, since a space previously opened for heat dissipation of the device is used, it is
possible to reduce noise while realizing space saving without using a special installation space.
[0032]
Brief description of the drawings
[0033]
1 is an explanatory view of the first embodiment.
[0034]
2 is a perspective view of the first embodiment.
[0035]
Fig. 3 Explanatory view (1) of the usage example of the first embodiment
[0036]
Fig. 4 An explanatory view (2) of a use example of the first embodiment.
[0037]
5 is an explanatory view of a modification of the first embodiment.
[0038]
6 is an explanatory view of the second embodiment.
[0039]
7 is a perspective view of the second embodiment.
[0040]
8 is an explanatory view of the third embodiment.
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[0041]
Explanation of sign
[0042]
DESCRIPTION OF SYMBOLS 1 noise reduction apparatus 2 board | substrate 3 opening windows
4a-4d 1st detection means 5a-5d antiphase sound production | generation part 6a-6d additional
sound source 7a-7d 2nd detection means 8a-8d storage body 9 apparatus 10 opening part 11
wall surface 13 Shunting portion 14 Noise reduction device 15 Duct forming plate 16 Noise
reduction device
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