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JPH03135199

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DESCRIPTION JPH03135199
[0001]
According to the method of providing a horn or an acoustic tube on the front surface of the
conventional speaker and guiding the sound wave generated from the speaker to the opening, a
large output sound pressure can be obtained as compared with the case where the horn or the
acoustic tube is not used It has the advantage of transmitting sound in a specific direction, and is
widely used in the past. Hereinafter, a speaker device using a conventional acoustic tube will be
described with reference to the drawings. FIG. 8 is a conceptual drawing of a television set
incorporating the above speaker device. In FIG. 8, 1 is a sliding force, 2 is an acoustic tube to
which the speaker 1 is attached, 3 is a television cabinet, and 4 is a cathode ray tube. First, the
operation of the television set incorporating the speaker apparatus t using the acoustic tube 2
configured as described above will be described. As shown in FIG. 8, a speaker device in which an
acoustic tube 2 for guiding sound waves to the front part of the speaker 1 is disposed along the
cathode ray tube 4 inside the television set, and further, the television cabinet 3 is mounted on
the speaker device. By adopting the structure along the line, it is possible to miniaturize the
television set. FIG. 9 is a structural conceptual view showing the configuration of the
conventional speaker device. In FIG. 9, 6 is an acoustic lens provided on the front part of the
speaker 1, 7 is a hole for guiding the sound wave emitted from the speaker 1 to the acoustic tube
2, and 6 is a reflection provided on both sides of the hole 7. A plate 9 is a sound absorbing
material, and the acoustic tube 2 is a combination of an acoustic tube panel 8 constituting most
of one sound tube 2 and an acoustic tube cover 10 in the direction of the arrow. The movement
of the loudspeaker apparatus configured as described below will be described below. The
acoustic lens 6 and the reflecting plate 6 provided on the front surface of the speaker 1 are for
improving the high frequency characteristic of the speaker device, and the sound absorbing
material 9 inserted on both sides of the reflecting plate 6 is inside the acoustic tube 2. It is for
suppressing the standing wave which generate | occur | produces. The acoustic tube 2 is
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configured such that the area is smaller at the front of the speaker and the area is larger as it
approaches the opening. According to the configuration as described above, when the speaker 1
is attached to the television set, the attachment portion of the speaker 1 is placed in the space
behind the cathode ray tube 4 and the acoustic tube 2 is used to Since the sound waves are
guided to the front of the set, the total length of the acoustic tube 2 is good. Under the present
circumstances, in order to prevent the disorder of the sound pressure frequency characteristic by
the disorder of the radiation impedance of acoustic tube 2, according to the conventional
composition, the speaker opening is made small using acoustic lens 5, and reflecting plate 6
expanded in convex shape By widening the aperture area in step 4 and taking the aperture sound
of the acoustic tube 2 to a large area, the rapid change in acoustic impedance between the
acoustic tube aperture and the free space is mitigated.
However, according to this configuration, the opening is necessarily smaller when the opening is
made thinner or attached to a small television, but the speaker 1 can not be brought out to the
front in relation to the intrigue and the gland 4. It is not possible to take an aperture ratio of t for
the length of the acoustic tube 2. As a result, the sound 1 impedance is disturbed, and a peak and
a day lag occur in the sound pressure frequency characteristic. SUMMARY OF THE INVENTION
The present invention solves the above-mentioned conventional problems, and provides a
speaker device capable of obtaining flat sound pressure frequency characteristics even with a
structure in which a large opening area can not be obtained. In order to solve this problem, in
order to solve this problem, the speaker apparatus of the present invention has an acoustic tube
for guiding a sound wave having a rectangular opening at the front of the speaker, and A
reflection plate is provided in the vertical direction with respect to the speaker attachment
surface and the opening, and the opening area of the throat portion constituted by the reflection
plate and the acoustic tube side wall adjacent thereto is from the opening on the speaker side A
sound absorbing material is inserted between the outside of the reflection plate and the inner
wall of the acoustic tube, and the range in which the opening area is narrowed is from the
speaker mounting surface. And 15% to 60% of the total length of the acoustic tube, and from the
end of the constriction thereof, it is configured to be expanded at a stretch to the opening
constituted by the outer wall of the acoustic tube. Operation With this configuration, in
consideration of incorporation into a cent, a speaker device having an acoustic tube whose
opening has a long and thin shape is flat even when the input / output aperture ratio can not be t
for its length. Sound pressure frequency characteristics can be obtained. Examples of the present
invention will be described below with reference to the drawings. The same reference numerals
as those in FIGS. 8 to 9 denote the same parts. FIG. 1 is a perspective view showing the structure
of a sound field tube in an embodiment of the present invention. 11 is an acoustic tube, 1 is a
speaker. 12 is an acoustic pipe opening. FIG. 2 is a cross-sectional view of the embodiment of
FIG. In this figure, the speaker 1 is attached in close contact with the speaker mounting rod 15 of
the acoustic tube 11 so that the sound wave from the front surface of the speaker 1 does not
wrap around to the rear surface. The mounting surface 16 is provided with an opening 14
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smaller than the speaker opening area. This opening X! A throat portion L2 configured along the
acoustic tube side wall 13 and the reflection plate 16 is continued around A14. The throat
portion L2 is configured such that the area thereof is gradually reduced by the acoustic tube side
wall 13 and the reflecting plate 16 as it goes from the front of the speaker to the acoustic tube
opening 12.
Further, the length L2 of the throat portion is in the range of 15% to 60% of the length of the
effective length L1 of the acoustic tube 11. The sound wave emitted from the speaker 1 is guided
through the throat portion L2 in the sound field tube 11 and emitted from the opening 12. FIG. 3
is a cross-sectional view taken along the line B-B of FIG. 1 embodiment 5; Here, the reflector 16 is
directed perpendicularly to the speaker attachment rod 15. However, if the reflecting plate 16 is
configured so that the opening area becomes smaller toward the acoustic tube opening 12 due to
the configuration with the acoustic tube side wall 13 within the range of FIG. It may be mounted
at an angle rather than perpendicular to the A sound absorbing material 18 is disposed between
the outside of the reflection plate 16 and the acoustic tube side wall 17 to minimize the standing
waves generated inside the acoustic tube 11 and flat sound with few peaks and dips. The
pressure frequency characteristic is realized. FIG. 4 is a view of only the acoustic tube 11 from
the side of the speaker attachment surface 15, and FIG. 6 is a view of the side of the aperture 12
of the acoustic tube. As described above, according to the present invention, the sound source PO
in FIG. 2 is moved to the virtual sound source P1 by the throat portion configured so that the
opening area is gradually narrowed by the reflection plate 16 and the acoustic tube side wall 13.
, Sound pipe length L one! Produces a shortened effect on the length of (L1L2). In addition, since
the throat opening area is narrowed, the opening ratio to the acoustic pipe opening 12 is
increased. These effects are the acoustic impedance characteristic KQ shown in FIG. The acoustic
impedance at the low frequency region has a large peak and dips when the opening is small with
respect to the shape as shown in FIG. 6a, that is, the entire length, but the opening is relatively
large according to FIG. Cono Heik, digging gets smaller. Therefore, according to the present
invention, it is possible to obtain relatively flat sound pressure frequency characteristics even if
the acoustic tubes have the same length and the same opening. In addition, as a secondary effect,
since the opening area of the throat portion gradually changes, it is possible to obtain a highfrequency characteristic with less attenuation without a standing wave being applied. Since the
speaker device of the present invention is configured as described below, a flat sound pressure
frequency characteristic can be obtained even when the input / output aperture ratio can not be
obtained with respect to the length of the acoustic pipe, and moreover the throat Since the
opening area of the part gradually changes, it is possible to obtain a flat high-frequency
characteristic with little attenuation without standing waves, and a dog with industrial threshold
value.
[0002]
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Brief description of the drawings
[0003]
1 is a perspective view of an embodiment of the speaker device according to the present
invention, FIG. 2 is an A-in sectional view of FIG. 1, FIG. 3 is a B-B sectional view of FIG. 1, and
FIG. 6 is a view from the side of the opening of the acoustic tube, FIG. 6 is a theoretical
conceptual view of one sound tube, and FIG. 7 is an acoustic view of the sound separation tube
shown in FIG. FIG. 8 is a conceptual view of a groove of a television set using the conventional
speaker device, and FIG. 9 is a groove construction of the conventional speaker device.
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