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JPH0414996

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DESCRIPTION JPH0414996
[0001]
INDUSTRIAL APPLICABILITY The present invention relates to an acoustic device having a
plurality of speakers and mainly relates to an acoustic device in which resonance (box noise) is
prevented. [Prior Art] A sound device having a plurality of speakers such as a radio cassette
player is likely to cause a resonance (box noise) of a cabinet (housing) housing the speakers
because the sound wave area generated by the plurality of speakers is different. is there. And,
when resonance (box sound) occurs, it is necessary to prevent this because noise and unpleasant
sound are generated in the human body's hearing. Conventionally, this type of acoustic device
has a wide space at the rear end of the speaker in order to obtain the baffle effect of the speaker,
and in the case of having the speakers on the left and right of the device, to eliminate left and
right interference. In some cases, one partition wall is provided corresponding to the rear end
portions of the left and right speakers. The prior art will be described below with reference to the
drawings. FIGS. 3A to 3D are acoustic devices having a plurality of speakers such as a
conventional radio cassette player. 3 (A) is a front sectional view, FIG. 3 (B) is a plan sectional
view, FIG. 3 (C) is a side sectional view, and FIG. 3 (D) is a portion of FIG. 3 (B) It is an enlarged
view. In FIGS. 3 (A) to 3 (D), 1 is a speaker, 4 is a speaker with a different range, and is fixed to
the front cabinet 7 with a screw 8 respectively. Reference numeral 2 denotes a rear side of the
housing, 6 denotes a rear cabinet, 7 denotes a front cabinet, and 12 denotes a single space
formed by the rear end of the speaker 1.4 and the rear side 2 of the housing. The rear cabinet 6
and the front cabinet 7 are joined as shown in FIG. 3 (D). [Problems to be Solved by the Invention
of the Invention] However, the conventional acoustic device as described above has the problem
that a resonance phenomenon occurs in the wide space portion 12 at the rear end portion of the
speaker, thereby obstructing the acoustic characteristics of the device. It was An object of the
present invention is to provide an acoustic device in which resonance (box noise) is reduced by
dividing a wide space into a plurality of parts in order to solve the problems of the prior art.
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[Means for Solving the Problems] In order to achieve the above object, the acoustic device of the
present invention is a acoustic device provided with a speaker and having a space between the
rear end of the speaker and the rear surface of the case. A partition is provided in the depth
direction of the space to form a plurality of spaces for independently resonating pressure
fluctuations emitted from the rear of the speaker. Further, in the above configuration of the
present invention, a plurality of speakers with different frequency ranges may be provided, and a
plurality of independent spaces may be provided to correspond to the rear end portions of the
respective speakers.
Further, in the configuration of the present invention, a plurality of openings can be formed on
the rear side of the housing corresponding to the plurality of space portions. [Operation]
According to the configuration of the present invention, a plurality of partition walls are provided
between the rear end portion of the speaker and the rear surface of the housing, and a plurality
of pressure fluctuations emitted from the rear portion of the speaker are resonated
independently. Thus, the acoustic device can reduce the occurrence of resonance (box noise),
particularly in the low frequency region. Furthermore, according to the configuration in which a
plurality of speakers of different frequency ranges according to the present invention are
provided and a plurality of independent spaces are provided to correspond to the rear end of
each speaker, not only the left and right speakers Interference of sounds generated by speakers
having different frequency ranges can be effectively prevented. Further, according to the
configuration in which a plurality of openings are formed on the rear side of the housing
corresponding to the plurality of space portions of the present invention, the sound pressure is
radiated from the rear of the acoustic device. Interference can be effectively prevented.
Embodiment An acoustic device according to an embodiment of the present invention will be
described in detail with reference to FIGS. 1 and 2. FIG. 1 (A) is a front sectional view, FIG. 1 (B) is
a plan sectional view, and FIG. 1 (C) is a side sectional view. FIG. 2 is an overall perspective view
of the same. In FIG. 1, 1 is a speaker, 4 is a speaker with a different frequency range, and is fixed
to the front cabinet 7 with a screw 8 respectively. Reference numeral 3 denotes a partition
provided on the case rear side 2 of the rear cabinet 6, and an independent space 5 is created to
correspond to the speaker rear end 1a. Further, 9 is a printed wiring board on which the
electronic component 11 is mounted, and is connected to another printed wiring board (not
shown) on the main body through the lead wire 10. Reference numeral 2a denotes an opening
provided so that sound pressure is emitted from the rear of the device. In the above, the plurality
of space portions 5 formed by the partition walls 3 are provided between the rear end portions
of the speakers 1 and 4 and the housing rear side surface 2, and the partition walls 3 are formed
in parallel in the depth direction. When viewed from the front direction of FIG. 1 (A), it is
preferable to provide a plurality of partitions in the vertical and horizontal directions.
Accordingly, the space portion 5 is a cylindrical body as shown in FIG. 1 (B) and FIG. 1 (C). The
size of the space 5 is, for example, 20 to 60 mm in height (height) when viewed from the front
direction of FIG. 1 (A). Preferably it is about 4 Q mm, width 20-60 mm, preferably about 40 mm,
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depth 50-200 mm. Preferably it is about 100 mm.
And in the above, it is desirable to make the vertical (height) and the horizontal the size which
divides the space part of the conventional radio-cassette into three equal parts. In the present
embodiment, the thickness of the outer cabinet is preferably about 3 to 3.5 mm. The thickness of
the partition 3 is preferably about 1.5 to 1.3 mm in order to prevent resonance. As a material,
polystyrene etc. having impact resistance can be used. Further, in the above, the plurality of
openings 2a provided in the housing rear side surface 2 of the rear cabinet 6 can be preferably
circular with a diameter of about 3 mm or a square with a diameter of about 3 × 5 mm. It is
preferable to provide as many openings 2a as possible in order to release sound pressure. The
functions of the acoustic device configured as described above will be described below with
reference to FIGS. 1 and 2. The natural frequency of the space in the housing on the rear face of
the speaker (sound and sound wave Toyohashi Kobayashi 550) In the conventional example, the
width w-230 mm of the space 5 and the depth of the space! = Height h of the same space portion
was about 200 mm. In this case ν o. o = 739 Hz 1. o, o = 850 Hz and 0, 0.1 = 850 Hz. In one
embodiment of the present invention, the space portion is divided into small spaces, and the
height h of one space portion 5 is h = 40 mm, the same width w = 35 mm, the depth # = 100
mm, and v o, o, 1 = 4250 HZ 0 0 , 1, 0 = 4857 Hz. Further, in the high frequency band, the
number of natural frequencies is N = 4 V (νc / C) ′ ′ so that dN / d シ C = 12 v × 2 / C3
(where C represents the speed of sound). As the fundamental frequency becomes higher, the
number of natural frequencies increases in proportion to the square of CC, and the natural
frequency continues. As a result, the frequency characteristic becomes fra soto. Therefore, it is
the low frequency that the frequency characteristic in space becomes a problem, and in practice
it is less than IKHz. The present embodiment can eliminate low frequency resonance phenomena
and can eliminate mutual interference between left and right speakers and speakers having
different frequency ranges without adding another component. As described above, according to
the embodiment of the present invention, by providing the partition wall to create an
independent space corresponding to the rear end of the speaker, the resonance phenomenon
affecting the acoustic characteristics of the device is eliminated and It is possible to inexpensively
eliminate mutual interference of the respective speakers. [Effects of the Invention] As described
above, according to the present invention, a partition is provided between the rear end of the
speaker and the rear side of the housing, and pressure fluctuations emitted from the rear of the
speaker are independently resonant. By forming a plurality of space parts for making it possible
to achieve the excellent effect of being able to reduce the occurrence of resonance (box noise),
particularly, resonance in a low frequency region.
Furthermore, since the present invention is provided with a plurality of speakers with different
frequency ranges, and a plurality of independent spaces are provided to correspond to the rear
end of each speaker, not only the left and right speakers but also the frequencies It is possible to
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achieve an excellent effect that sound interference generated by speakers in different ranges can
be effectively prevented. Further, since the present invention forms a plurality of apertures on
the rear side of the housing corresponding to the plurality of space portions, the sound pressure
is radiated from the rear of the acoustic device and interference of the sound generated by the
speaker is The excellent effect of being able to be effectively prevented can be achieved.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a view of an acoustic device according to an embodiment of the present invention, and
FIG. 1 (A) is a front sectional view thereof, FIG. 1 (B) is a plan sectional view thereof, and FIG. 2 is
a general perspective view of the same, FIG. 3 is a view of a conventional example, FIG. 3 (A) is a
front sectional view thereof, FIG. 3 (B) is a plan sectional view, FIG. C) is a side sectional view of
the same, and FIG. 3 (D) is a partially enlarged view of FIG. 3 (B).
DESCRIPTION OF SYMBOLS 1 ... Speaker 2, 2 ... case rear side, 2a ... hole, 3 ... partition, 4 ... the
speaker from which a range differs, 5 ... space part, 6 ... rear cabinet , 7 ... front cabinet. 3 ·
Partition wall 4 · · · Speaker 5 different in range · · Space portion 6 · · · rear cabinet Figure 1 (A)
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