close

Вход

Забыли?

вход по аккаунту

JP2015026907

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 JP2015026907
A speaker device is provided that is easy to carry while improving the sound pressure level in the
low-pitch range of a flat speaker. A speaker unit (14) is provided inside a resonance tube (21) to
constitute a subwoofer. The sound output from the rear surface of the speaker unit 14 resonates
in the low frequency range in the resonance tube 21, and the sound pressure level in the low
frequency range which can not be output by the flat speaker 18 can be improved. Moreover,
since the inside of the resonance pipe 21 is hollow, the flat speaker 18 can be stored and carried.
A protective structure 31 is provided on the back of the speaker unit 14. [Selected figure] Figure
2
Speaker device
[0001]
The present invention relates to a speaker device provided with a flat speaker.
[0002]
Conventionally, as a flat speaker, for example, an electrostatic flat speaker has been proposed in
which flat electrodes are disposed on both sides of a vibrating membrane and the vibrating
membrane is vibrated by electrostatic force to emit sound (see, for example, Patent Document 1) .
[0003]
Since such a flat speaker can be bent, for example, as shown in Patent Document 2, a flat speaker
used in a state of being folded in half is also proposed.
11-05-2019
1
[0004]
JP, 2008-54154, A JP, 2009-206758, A
[0005]
However, the flat speaker can not take a large amplitude structurally, so the reproduced sound
pressure level in the low range is insufficient.
In addition, the flat speaker becomes inconvenient to carry as the area increases.
[0006]
Therefore, an object of the present invention is to provide a speaker device that is easy to carry
while improving the reproduction sound pressure level in the low-pitch range of the flat speaker.
[0007]
The speaker device of the present invention includes a flat speaker and a subwoofer having a
resonance tube.
The subwoofer is characterized in that a storage section for storing the flat speaker is provided in
the resonance tube.
[0008]
The resonant tube is a long tubular structure that resonates with the sound of a wavelength
proportional to the length of the tube.
The resonant tube resonates with sound at a wavelength four times the length of the tube if only
one of the tubes is open.
11-05-2019
2
For example, when the length of the tube is about 1 m and one side is open, it resonates in a bass
range of about 85 Hz theoretically.
Since the lower limit of the outputtable frequency of the flat speaker is about 100 Hz to 200 Hz,
the sound pressure level in the low frequency range where the flat speaker can not output can be
improved if the length of the tube is about 1 m.
[0009]
Further, since the flat speaker can be bent, carrying the storage container for storing the flat
speaker in the resonance tube is easy to carry. For example, if the length of the tube is about 1 m,
the A0 size (841 × 1189 mm) can be stored and carried.
[0010]
Furthermore, if the resonance tube is installed with the longitudinal direction oriented in the
vertical direction, it is also possible to form a part of the support of the flat speaker.
[0011]
It is possible to use the hollow portion in the resonance tube as it is or to provide a cylindrical
cover outside the side surface of the resonance tube and wrap a flat speaker around the side
surface of the resonance tube within the cover. is there.
[0012]
In the case where the flat speaker is housed inside the resonance tube, the subwoofer is provided
with a speaker unit toward one opening end inside the resonance tube, and the subwoofer is
acoustically installed between the speaker unit and the other opening end. Preferably, a
protective structure is provided which is open.
[0013]
Thus, when the flat speaker is housed inside the resonance tube, the flat speaker does not come
in contact with the speaker unit.
11-05-2019
3
[0014]
According to the present invention, portability is facilitated while improving the sound pressure
level of the low-pitched range of the flat speaker.
[0015]
It is an external appearance perspective view of a speaker apparatus.
It is a cross-sectional view of a speaker apparatus.
It is a block diagram which shows the structure of a speaker apparatus.
It is a figure which shows a frequency characteristic.
It is an external appearance perspective view and a front view showing composition of a speaker
apparatus concerning modification 1. FIG.
It is an external appearance perspective view which shows the structure of the speaker apparatus
which concerns on the modification 2. FIG.
[0016]
FIG. 1 is an external perspective view of a speaker device 1 according to an embodiment of the
present invention. FIG. 2A is a cross-sectional view in the case where the speaker device 1 is
used. FIG. 2B is a cross-sectional view in the case of carrying the speaker device 1. FIG. 3 is a
block diagram showing the configuration of the speaker device 1.
[0017]
As shown in FIG. 1 and FIG. 2A, the speaker device 1 is a holding device for suspending the stand
25, the resonance pipe 21 connected to the stand 25, the flat speaker 18, and the flat speaker 18
11-05-2019
4
in appearance. And a member 22.
[0018]
The resonance tube 21 has a long cylindrical shape with both ends open.
The longitudinal direction of the resonance tube 21 is used in the vertical direction. A stand 25 is
connected to the side surface of one of the open ends of the resonance tube 21 at the vertically
lower side. The stand 25 is a foldable three-legged stand. As shown in FIG. 1 and FIG. 2A, when
the speaker device 1 is in use, the stand 25 opens the three legs to be in contact with the floor
surface and supports the speaker device 1.
[0019]
On the other hand, when carrying the speaker device 1, the stand 25 folds the three legs and
stores it along the side surface of the resonance tube 21. The structure of the stand 25 is not
limited to this example. In addition, the stand 25 is not an essential component in the present
invention, and a mechanism for connecting the stand 25 to any part of the resonance tube 21
may be provided. In this case, a stand may be separately prepared at the place of use, and the
resonance tube 21 may be connected. Also, the speaker device 1 may be fixed to a wall or a pillar
instead of being made to stand on the floor surface.
[0020]
A box 101 incorporating hardware 100 for performing various signal processing is provided in
the vicinity of one opening end vertically downward among the side surfaces outside the
resonance tube 21. In addition, the speaker unit 14 is installed in the vicinity of one opening end
in the vertically lower side of the inside of the resonance tube 21.
[0021]
The hardware 100 is connected to the speaker unit 14 and the planar speaker 18 via signal lines
11-05-2019
5
(not shown). The hardware 100 and the box 101 are not essential components in the present
invention, and may be carried separately from the resonance tube 21 and the flat speaker 18.
Further, the position of the box 101 is not limited to the example of this embodiment.
[0022]
As shown in FIG. 3, the hardware 100 includes an input interface (I / F) 11, a low pass filter (LPF)
12, an amplifier 13, a band pass filter (BPF) 15, an amplifier 16, a booster 17, and a bias power
supply 19. Is equipped.
[0023]
In the present embodiment, the D / A converter, the A / D converter, and the like are omitted, and
all signals transmitted through the speaker device 1 will be described as digital signals unless
otherwise specified.
[0024]
The input I / F 11 inputs an audio signal related to content from an external sound source.
The content is, for example, content for a commercial including audio sound and sound such as
BGM.
The hardware 100 may be provided with a configuration for decoding encoded content data, or
the hardware 100 may be provided with a storage unit for storing content data.
[0025]
The input I / F 11 outputs the input audio signal to the LPF 12 and the BPF 15. The LPF 12
removes the high range of the audio signal and outputs it to the amplifier 13. The frequency to
be removed by the LPF 12 is set to a lower limit (for example, about 100 Hz to 200 Hz) of the
outputtable frequency of the flat speaker 18. The amplifier 13 amplifies the input audio signal
and outputs it to the speaker unit 14.
11-05-2019
6
[0026]
The BPF 15 blocks passage of an unnecessary band of the audio signal, passes only a desired
band, and outputs it to the amplifier 16. For example, the BPF 15 passes a frequency band
corresponding to the LPF 12 (100 Hz to 200 Hz) to a frequency band of about 20 kHz.
[0027]
The flat speaker 18 is an electrostatic type speaker and has a structure in which a sheet-like
vibrating film is sandwiched between two fixed electrode plates. In the flat speaker 18, a bias
voltage is applied to the diaphragm via the bias power supply 19. The booster 17 changes the
voltage applied to the fixed electrode plate according to the audio signal input from the amplifier
16 to change the electrostatic force generated between the diaphragm and the fixed electrode
plate. The flat speaker 18 vibrates the diaphragm by the change of the electrostatic force and
outputs a sound.
[0028]
Since such a flat speaker 18 can not generally take a large amplitude structurally, the lower limit
of the outputtable frequency is high, for example, about 100 Hz to 200 Hz. In the present
embodiment, an example in which an electrostatic speaker is used as the flat speaker 18 is
shown, but an embodiment using another flat speaker such as an electromagnetic type or a
piezoelectric type is also possible.
[0029]
Referring back to FIGS. 1, 2A, and 2B, the structure of the speaker device 1 will be described. A
holding member 22 for suspending the flat speaker 18 is installed on the side surface of the
other open end vertically above the resonance tube 21. In this example, the holding member 22
is a hook-like member protruding in the normal direction from the side surface of the resonance
tube. Since the holding member 22 is rotatable at the connection point with the resonance pipe
21, as shown in FIG. 2B, when carrying the speaker device 1, it is rotated toward the center of
the resonance pipe 21; The holding member 22 can be prevented from popping out in the
normal direction of the resonance tube 21. The structure of the holding member 22 is not limited
11-05-2019
7
to this example. Moreover, it is not essential that the holding member 22 is connected to the
resonance tube 21 and may be carried separately.
[0030]
The speaker unit 14 installed inside the resonance tube 21 is a general cone-shaped speaker unit.
The front surface of the speaker unit 14 that emits the sound wave is set from the inside to the
outside of the resonance tube 21 at one open end of the resonance tube 21. The speaker unit 14
is a speaker unit for low frequency, and a subwoofer is realized by the speaker unit 14 and the
resonance tube 21.
[0031]
The speaker unit 14 has an outer diameter substantially the same as the inner diameter of the
resonance tube 21. Therefore, the vicinity of the vertically lower opening end of the resonance
tube 21 is acoustically closed with the speaker unit 14 as a boundary. The sound wave output
from the front of the speaker unit 14 is radiated to the space around the speaker device 1.
[0032]
On the other hand, a punching metal 31 corresponding to the protective structure of the present
invention is installed in the vicinity of the back surface of the speaker unit 14 in the inside of the
resonance tube 21. The protective structure is a structure for protecting the speaker unit 14
from the stored items when an object (for example, the flat speaker 18 as described later) is
stored inside the resonance tube 21. The punching metal 31 is acoustically open to allow free
passage of sound waves, and the sound output from the back surface of the speaker unit 14
resonates at the resonance tube 21. The resonance tube 21 on the back side of the speaker unit
14 has a structure in which only one end (the upper side in the figure) is open, and is a so-called
"closed tube". A sound of wavelength four times the length of L will resonate as the lowest
resonant frequency.
[0033]
11-05-2019
8
FIG. 4 is a diagram showing frequency characteristics of the speaker device 1 according to the
present invention. The horizontal axis of the graph in the figure is the frequency (Hz), and the
vertical axis is the sound pressure level (dB). As indicated by the broken line in the figure, the
lower limit of the frequency that can be output of the flat speaker 18 of the present embodiment
is approximately 100 Hz to 200 Hz. On the other hand, as indicated by the alternate long and
short dash line in the figure, the subwoofer composed of the speaker unit 14 and the resonance
tube 21 has a high level peak at a frequency f1 lower than the lower limit of the frequency that
the flat speaker 18 can output. For example, if the length from the back surface of the speaker
unit 14 to the opening end among the lengths in the longitudinal direction of the resonance tube
21 is about 1 m, theoretically the resonance occurs in a low frequency band of about 85 Hz. It
resonates at a frequency f1 lower than the lower limit of the outputtable frequency. Then, by
setting the upper limit of the frequency of the audio signal input to the speaker unit 14 to about
100 Hz in the LPF 12, the overall frequency characteristic of the speaker device 1 as shown by
the solid line in the figure can be obtained. Thereby, it is possible to improve the sound pressure
level in the low frequency range where the flat speaker 18 can not output.
[0034]
Since the flat speaker 18 can be bent, it can be stored and carried inside the resonance tube 21
by rolling (or folding) as shown in FIG. 2 (B). . As described above, if the length from the back
surface of the speaker unit 14 to the opening end is about 1 m and the size of the flat speaker 18
is up to A0 size (841 × 1189 mm), It can be stored inside.
[0035]
Furthermore, since the resonance tube 21 constitutes a part of the support of the flat speaker 18,
it can be carried without preparing a support separately.
[0036]
Further, since the punching metal 31 is installed in the vicinity of the back surface of the speaker
unit 14 in the inside of the resonance tube 21, even if the flat speaker 18 is housed, it does not
contact the speaker unit 14, The speaker unit 14 and the flat speaker can be protected.
[0037]
Next, FIG. 5 (A) and FIG. 5 (B) are figures which show the structure of the speaker apparatus 1A
11-05-2019
9
which concerns on the modification 1. FIG.
FIG. 5 (A) is an external perspective view, and FIG. 5 (B) is a front view partially transparent.
5 (A) and 5 (B), the same reference numerals are given to the same components as in FIGS. 1 and
2, and the description will be omitted.
[0038]
Although the speaker device 1 shown in FIGS. 1 and 2 shows an example in which the hollow
portion inside the resonance tube 21 is used as a storage portion of the flat speaker 18, the
speaker device 1A is outside the cylindrical resonance tube 21A. The space part 201 which rolls
in and accommodates the flat speaker 18 along a side surface is provided.
[0039]
The space portion 201 is a cylindrical space provided with a cylindrical cover on the outer side of
the outer side surface of the resonance pipe 21A and formed between the cover and the
resonance pipe 21A.
The speaker device 1A has a mode in which the flat speaker 18 is wound in the space portion
201. Therefore, the speaker device 1A can be carried and installed more easily by pulling out the
flat speaker 18 from the space portion 201 when used, and storing the flat speaker 18 in the
space portion 201 when carrying it. Can.
[0040]
Next, FIG. 6A and FIG. 6B are diagrams showing a configuration of a speaker device 1B according
to a second modification. FIG. 6A is an external perspective view of the case where the speaker
device 1B is used, and FIG. 6B is an external perspective view of the case where the speaker
device 1B is carried. 6 (A) and 6 (B), the same reference numerals are given to configurations
common to those in FIGS. 1 and 2, and the description will be omitted.
11-05-2019
10
[0041]
The speaker device 1B differs from FIGS. 1 and 2 in that the flat speaker 18 is housed in a
square-shaped resonance tube 21B. Further, in this example, the flat speaker 18 is configured to
be folded so as to be accommodated inside the resonance tube 21B.
[0042]
Even in the case of carrying the speaker device 1B in the square-shaped resonance tube 21B, the
flat speaker 18 can be more easily carried by storing the flat speaker 18 in the resonance tube
21B.
[0043]
DESCRIPTION OF SYMBOLS 11 ... Input I / F12 ... LPF13 ... Amplifier 14 ... Speaker unit 15 ...
BPF16 ... Amplifier 17 ... Booster 18 ... Flat speaker 19 ... Bias power supply 21 ... Resonant tube
22 ... Holding member 25 ... Stand 31 ... Punching metal
11-05-2019
11
1/--страниц
Пожаловаться на содержимое документа