close

Вход

Забыли?

вход по аккаунту

?

JPH06351091

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH06351091
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device such as a woofer for reproducing low-pitched sound, which is capable of
resonating a sound to be reproduced by a duct to enhance a predetermined frequency
component.
[0002]
2. Description of the Related Art In a speaker apparatus for resonating with a duct the bass
enhanced by a woofer, which is a conventional bass reproduction speaker, a single tubular duct is
provided in front of or behind a housing in which the loudspeaker body is housed. It is provided.
Furthermore, in a so-called bass reflex type speaker device, a through hole is provided in a part
of the front plate of the casing of the closed type speaker, and the through hole is provided with,
for example, a straight cylindrical duct. With such a structure, the phase of the sound emitted
from the back of the speaker attached to the housing is inverted, and the sound emitted from the
through hole is radiated in the same phase as the sound emitted from the speaker forward.
Furthermore, the air in the duct resonates with the elasticity of the air in the housing by the duct
to enhance the radiation effect of the bass. Thus, the sound pressure of the bass is increased with
respect to the closed-type speaker of the same volume.
[0003]
03-05-2019
1
SUMMARY OF THE INVENTION The duct provided in the prior art speaker apparatus as
described above is formed in a tubular shape having a single space. Therefore, since the length of
the duct is fixed, the frequency at which the peak occurs is constant, and the frequency band in
the bass region can not be arbitrarily enhanced. For this reason, when the sound pressure level of
the bass largely changes depending on the reproduction location, the desired frequency band can
not be enhanced in response to the change in the sound field characteristic or in accordance with
the preference of the listener. In particular, in a speaker device mounted on a vehicle such as an
automobile, it is difficult to reproduce a low tone range sufficiently because a reduction in the
diameter of the speaker body is required due to the limitation of the space in the vehicle.
[0004]
An object of the present invention is to provide a speaker device capable of selecting and
enhancing an arbitrary frequency band in a low tone range in order to solve the abovementioned problems.
[0005]
SUMMARY OF THE INVENTION The present invention provides a hollow housing, a speaker body
provided inside the housing, and a plurality of cylinders provided in front of or behind the
speaker body and having mutually different lengths and cross-sectional areas. It is a speaker
apparatus characterized by having a body and a cylinder switching means for closing or opening
each cylinder.
[0006]
According to the present invention, the speaker device comprises the hollow housing, the
speaker body, the plurality of cylinders, and the cylinder switching means.
A plurality of tubes having different lengths and cross-sectional areas are provided in front of or
behind the speaker body housed in the hollow housing, and the tubes have different resonance
frequencies and sound pressures.
Since the cylinder switching means can freely open and close each cylinder and can freely select
each cylinder, the bass frequency band can be selectively enhanced and the speaker device can
be reproduced according to the place or listener's preference. It is possible to obtain the
03-05-2019
2
corresponding bass and the sensation.
[0007]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a perspective view
showing a speaker apparatus 1 according to an embodiment of the present invention. In the
speaker device 1 of the present embodiment, the top plate 1a is removed and illustrated so that
the internal structure can be easily understood. In the hollow housing 3, the speaker main body 2
of the woofer which is a speaker for low range reproduction is housed. The flange 2a of the
speaker body 2 is fixed to the baffle plate 4 by bolts and nuts. At the front of the speaker body 2,
ducts 5, 6, 7 are provided which are a plurality of cylindrical bodies having different lengths and
cross-sectional areas. The length L of the duct is determined as L / 4λ / 4 from the equation of
the fundamental vibration in the case of a closed tube, where the wavelength is λ. For example,
when it is desired to intensify the sound of 100 Hz by the duct 5, the duct length L1 = 3.4 / 4 =
85 cm can be obtained from the wavelength λ1 = 340/100 = 3.4 m using the sound velocity of
340 m / sec. Similarly, if it is desired to reproduce 80 Hz sound by the duct 7, the duct length L2
= 106 cm, and if it is desired to reproduce 50 Hz sound by the duct 8, the duct length L3 = 170
cm is obtained. The duct 6 has a long path and is meandered to form a path so that space can be
used effectively. Further, in the present embodiment, the cross sectional area of each duct is
formed to increase in the order of the duct 5, the duct 6, and the duct 7. The ducts 5, 6, 7 shown
in FIG. 1 have the shape of a square cylinder, but may be another polygonal cylinder, a cylinder
or the like. Shielding plates 8, 9, 10 are separately provided as cylinder switching means so that
each duct can be freely closed or opened. Since the shapes of the shielding plates 8, 9, 10 are
equal to the cross-sectional shapes of the ducts 5, 6, 7, respectively, the openings 5a of the ducts
5, 6, 7 are formed by the shielding plates 8, 9, 10. , 6a, 7a can be closed respectively.
[0008]
For example, when only the duct 5 is to be used to enhance the bass frequency band, the
shielding plates 9 and 10 are fitted to the openings 6a and 7a of the ducts 6 and 7, respectively,
and the ducts 6 and 7 are closed. 5 only open. Further, when it is desired to increase the
frequency band of the bass by using only the duct 6, the shielding plates 8, 10 are respectively
fitted to the openings 5a, 7a of the ducts 5, 7 to close the ducts 5, 7 6 only open. In this way, it is
possible to select the combination of the ducts 5, 6, 7 desired to be opened corresponding to the
frequency band to be enhanced.
03-05-2019
3
[0009]
In the case of this embodiment, when only the duct 5 is opened as a combination of the ducts 5,
6 and 7 to be opened, when only the duct 6 is opened, and when only the duct 7 is opened, the
duct 5 and the duct 6 are In the case of opening the duct 5 and the duct 7, in the case of opening
the duct 6 and the duct 7, seven types of cases of opening the duct 5 and the duct 6 and the duct
7 are considered. Seven types of bass can be selected and enhanced in response to changes in the
field characteristics.
[0010]
FIG. 2 is a graph showing an example of a bass frequency band enhanced by selecting the ducts
5, 6, 7 of the speaker device 1 shown in FIG.
FIG. 2A shows the frequency band of the sound generated when all of the ducts 5, 6, 7 are closed
by the shielding plates 8, 9, 10. FIG. In this case, the bass in the frequency band below 100 Hz is
not enhanced, and the listener can not hear the bass. FIG. 2 (b) shows the case where only the
duct 6 is open and the bass in the 50 Hz frequency band is enhanced. FIG. 2 (c) shows the case
where only the duct 7 is opened and the bass in the 80 Hz frequency band is enhanced. FIG. 2D
shows the case where only the duct 5 is opened and the bass in the frequency band of 100 Hz is
enhanced. By selecting and opening each duct 5, 6, 7, the desired bass frequency band can be
enhanced, and the bass frequency band difficult for the listener to listen to due to the change of
the sound field characteristic can be enhanced and compensated. . Also, the bass frequency band
can be freely enhanced according to the listener's preference. Besides, the bass frequency band
may be overlapped and enhanced by selecting each of the ducts 5, 6, 7 in combination.
[0011]
FIG. 3 is a perspective view showing a speaker device 11 according to another embodiment of
the present invention. Also in the speaker device 11 of the present embodiment, the top plate 1a
is removed and illustrated so that the internal structure can be easily understood. The same
reference numerals as in FIG. 1 denote the same parts. Similar to FIG. 1, the flange 2 a is fixed to
the baffle plate 4 with a bolt and a nut, and the speaker body 2 is housed in the hollow housing
3. In front of the speaker body 2, a plurality of cylindrical ducts 15, 16 and 17 having different
lengths and cross-sectional areas are provided. In the present embodiment, the cross-sectional
area of each duct is formed to be smaller in the order of the duct 15, the duct 16 and the duct
17, and the length of each duct is formed to be longer in the above order. Shielding plates 18, 19
03-05-2019
4
provided with through holes 18a, 19a, 20a having the same shape as the sectional shape of the
ducts 15, 16, 17 as cylinder switching means for closing or opening the ducts 15, 16, 17 20 is
used. When only the duct 15 is opened, the shielding plate 18 is superimposed on the duct
opening surface 14 so that the through hole 18 a provided in the shielding plate 18 matches the
opening 15 a of the duct 15. The openings 16 a and 17 a of the ducts 16 and 17 are closed by
the shielding plate 18, and only the duct 15 is opened through the through holes 18 a of the
shielding plate 18. Similarly, when only the duct 16 is opened, the shielding plate 19 is
superposed on the duct opening surface 14 to close the openings 15a, 17a of the ducts 15, 17.
Similarly, when only the duct 17 is opened, the shielding plate 20 is placed on the duct opening
face to close the openings 15a and 16a of the ducts 15 and 16. Although only one through hole
is provided in the shielding plates 18, 19 and 20 shown in FIG. 3, a plurality of through holes
may be provided so as to open the openings of the plurality of ducts.
[0012]
FIG. 4 is a plan view showing a speaker device 21 according to still another embodiment of the
present invention. Also in the present embodiment, the top board 1 a is removed and illustrated
so that the internal structure of the speaker device 21 can be easily understood. The speaker
device 21 shown in FIG. 4 is similar to the speaker device 11 shown in FIG. 3, and the
corresponding portions are denoted by the same reference numerals. The difference from the
embodiment shown in FIG. 3 is that the throttle valves 22, 23, 24 are used as cylinder switching
means for closing or opening the ducts 15, 16, 17. At the tip of the throttle valve 22, 23, 24, flat
plates 22a, 23a, 24a having the same shape as the cross-sectional shape of the opening of each
duct 15, 16, 17 are provided. By rotating the handles 22b, 23b, 24b of the throttle valves 22, 23,
24, the flat plates 22a, 23a, 24a at the tip end can rotate in conjunction with each other to close
or open one end of the ducts 15, 16, 17. it can. In FIG. 4, the flat plates 22 a and 24 a are made
parallel to the opening faces of the ducts 15 and 17 by the throttle valves 22 and 24, and the
ducts 15 and 17 are closed, and the flat plate 23 a is an opening of the duct 16 by the throttle
valve 23. It is perpendicular to the plane and represents the state in which the duct 16 is open.
Thus, by selecting and opening or closing a plurality of ducts, it is possible to enhance the bass
frequency band according to the listener's preference.
[0013]
In addition, it is possible to intensify the bass portion corresponding to the sound field
characteristic which changes depending on the place where the speaker device is placed. In
particular, when the speaker device of the present invention is mounted on a vehicle, the bass
03-05-2019
5
frequency band can be enhanced according to the change of the vehicle type, and therefore, it is
not necessary to produce different speaker devices for each vehicle type. It becomes possible to
cope with the high-mix low-volume production of vehicles. In the speaker devices 1, 11 and 21
shown in the embodiment of the present invention, the ducts 5, 6, 7, 15, 16 and 17 are provided
in front of the speaker main body 2, but the ducts are provided in the rear of the speaker main
body 2. You may provide.
[0014]
As described above, according to the present invention, a plurality of cylinders having mutually
different lengths and cross-sectional areas are provided in the front or back of the speaker main
body housed in the hollow housing, and the cylinder switching means Thus, each cylinder can be
closed or opened, and each cylinder can be freely changed, so that it is possible to select and
enhance a bass frequency band corresponding to the change of the sound field characteristic and
the preference of the listener.
03-05-2019
6
Документ
Категория
Без категории
Просмотров
0
Размер файла
15 Кб
Теги
jph06351091
1/--страниц
Пожаловаться на содержимое документа