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DESCRIPTION JP2018164243

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DESCRIPTION JP2018164243
Abstract: PROBLEM TO BE SOLVED: To provide a coaxial speaker device emitting high-quality
sound with little distortion. A first speaker unit 101, a first cabinet 111 for housing the first
speaker unit 101, and a first speaker unit 101 An annular portion 103 is disposed on the
radiation side of the sound to surround the diaphragm 112 and forms a sound path 110 for
guiding the emitted sound to the outside of the first cabinet 111, and a cylindrical portion
disposed inside the annular portion 103. The second cabinet 121 disposed apart from the sound
path 110 and the second speaker unit 102 which emits sound in the same direction as the first
speaker unit 101 to be accommodated in the second cabinet 121 and the sound path 110
communicate with each other. And a resonance unit 143 having an opening 141 and forming a
resonance space 142. [Selected figure] Figure 2
Speaker device
[0001]
The present invention relates to a speaker device, and more particularly to a speaker device in
which a second speaker unit is disposed in front of a first speaker unit.
[0002]
Conventionally, a so-called coaxial speaker device in which a point sound source is brought close
by arranging a pair of speaker units in the front-rear direction is disclosed (see, for example,
Patent Document 1).
[0003]
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1
Japanese Utility Model Publication No. 55-72384
[0004]
As in the speaker device described in Patent Document 1, a coaxial speaker device in which a
speaker unit for high frequency band is disposed at the center of a frame of a speaker unit for
low frequency band, and frames of a pair of speaker units are connected The problem is that the
sound radiated from the high-pitched speaker unit is beaten by the sound of the low-pitched
speaker unit, and a sound including distortion (intermodulation distortion) is emitted as a whole,
and the sound quality as the speaker device is degraded. Have.
[0005]
The present invention is made based on the above-mentioned subject, and aims at offer of a
speaker apparatus which controls distortion which a speaker apparatus which arranged a pair of
speaker units in the front-back direction generates, and which improves sound quality.
[0006]
The speaker apparatus according to the present invention comprises a first speaker unit, a first
cabinet accommodating the first speaker unit, and a diaphragm of the first speaker unit on the
sound radiation side of the first speaker unit. An annular portion that is disposed so as to
surround and forms a sound path that guides the sound emitted by the first speaker unit to the
outside of the first cabinet and a cylindrical sound path that is disposed inside the annular
portion. A second cabinet is disposed, a second loudspeaker unit which radiates a sound in the
same direction as the first loudspeaker unit and accommodated in the second cabinet, an opening
communicating with the sound path, and And a resonating portion to be formed.
[0007]
Further, a speaker device which is another one of the present invention includes a first speaker
unit, a first cabinet accommodating the first speaker unit, and the first speaker unit on the sound
radiation side of the first speaker unit. And an annular portion forming a sound path for guiding
the sound emitted by the first speaker unit to the outside of the first cabinet, and the cylindrical
sound disposed inside the annular portion. The second cabinet includes a second cabinet
disposed across the road, and a second speaker unit that emits sound in the same direction as the
first speaker unit and is accommodated in the second cabinet, the second cabinet including the
second cabinet The back surface part which follows the shape of the said diaphragm is provided
in the surface which opposes the diaphragm of one speaker unit.
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[0008]
According to the present invention, by arranging the first speaker unit and the second speaker
unit in the front-rear direction, a sound with little change in sound quality due to the listening
position is emitted, and a high-quality sound with little distortion is emitted. It becomes possible.
[0009]
FIG. 1 is a perspective view showing the appearance of the speaker device according to the
present embodiment.
FIG. 2 is a cross-sectional perspective view showing the inside of the speaker device in the
present embodiment.
FIG. 3 is a cross-sectional view showing a speaker unit portion of the speaker device according to
the present embodiment.
FIG. 4 is a perspective view showing an annular portion, a resonance portion, and a speaker unit
in the present embodiment.
FIG. 5 is a diagram for explaining the low frequency reproduction limit frequency.
FIG. 6 is a cross-sectional view showing another example of the speaker unit portion of the
speaker device.
FIG. 7 is a cross-sectional view showing another example of the speaker unit portion of the
speaker device.
[0010]
Next, an embodiment of a speaker device according to the present invention will be described
with reference to the drawings.
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The following embodiment is merely an example of the speaker device according to the present
invention.
Accordingly, the scope of the present invention is defined by the wording of the claims with
reference to the following embodiments, and is not limited to only the following embodiments.
Therefore, among the components in the following embodiments, components that are not
described in the independent claim showing the highest concept of the present invention are not
necessarily required to achieve the object of the present invention, It is described as constituting
a preferred embodiment.
[0011]
In addition, the drawings are schematic diagrams in which emphasis, omission, and adjustment of
ratios are appropriately performed to show the present invention, and may differ from actual
shapes, positional relationships, and ratios.
[0012]
Embodiment FIG. 1 is a perspective view showing an appearance of a speaker device according to
the present embodiment.
[0013]
FIG. 2 is a cross-sectional perspective view showing the inside of the speaker device according to
the present embodiment.
[0014]
FIG. 3 is a cross-sectional view showing a speaker unit portion of the speaker device according to
the present embodiment.
[0015]
As shown in these figures, the speaker device 100 is a speaker in which two speaker units are
arranged side by side in the front-rear direction (X-axis direction in the drawing), and the first
speaker unit 101 and the second speaker unit 102. , A first cabinet 111, a second cabinet 121,
an annular portion 103, and a resonance portion 104.
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[0016]
The first speaker unit 101 is a speaker designed to take charge of sound emission in a lower
frequency range than the second speaker unit 102 unit, and includes a vibration system having a
diaphragm 112, a voice coil 113, and a frame 114 , And a field portion having a magnet 116 and
a plate 117.
[0017]
In the case of the present embodiment, the first speaker unit 101 is accommodated in the first
cabinet 111, and is attached to the first baffle plate 118 closing the front opening of the first
cabinet 111 via the annular portion 103. .
The first speaker unit 101 may be held by the first cabinet 111 via a holding member or the like.
[0018]
In the present embodiment, the first speaker unit 101 is shown as a general speaker provided
with a conical (conical) diaphragm, but the first speaker unit 101 is not particularly limited, and
is known It is possible to replace with other speakers.
[0019]
The second speaker unit 102 is a speaker smaller than the first speaker unit 101, and is a
speaker designed to take charge of the emission of sound in the high frequency range more than
the first speaker unit 101.
Similarly to the first speaker unit 101, the second speaker unit 102 also includes a diaphragm, a
voice coil, a frame, a yoke, a magnet, a plate and the like, but these are not shown.
[0020]
The second speaker unit 102 is disposed in front of the diaphragm 112 of the first speaker unit
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101 (X-axis negative side in the drawing) so as to emit sound in the same direction as the first
speaker unit 101.
Further, the second speaker unit 102 is housed and held in a second cabinet 121 disposed
between the second speaker unit 102 and the diaphragm 112 of the first speaker unit 101.
[0021]
In the case of the present embodiment, the first speaker unit 101 and the second speaker unit
102 are arranged in a state in which the axes of the voice coils coincide with each other, and socalled coaxial speaker arrangement is provided.
[0022]
In the present embodiment, the second speaker unit 102 is shown as a general speaker, but the
second speaker unit 102 is not particularly limited, and can be replaced with another known
speaker. .
[0023]
FIG. 4 is a perspective view showing the ring portion, the resonance portion, and the speaker
unit.
[0024]
As shown in the figure, the annular portion 103 is a radiation side (X-axis negative side in the
figure) of the sound of the first speaker unit 101 and the diaphragm of the first speaker unit 101
around the outside of the second speaker unit 102. The sound emitted from the first speaker unit
101 is disposed so as to surround the 112, and the sound of the first baffle plate 118 is formed
through the tubular sound path 110 formed between the first cabinet 111 and the second
cabinet 121. It is an annular (tubular) member leading to the outside.
[0025]
In the case of the present embodiment, the diaphragm 112 of the first speaker unit 101 has a
conical shape (cone shape), and the annular portion 103 has a cylindrical shape having an inner
diameter substantially the same as the diameter of the bottom surface of the diaphragm 112 .
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Further, the annular portion 103 is provided with a hole (or a notch) which functions as an
opening 141 of the resonance portion 104 described later.
[0026]
The resonance portion 104 is a portion having an opening 141 communicating with the sound
path 110 and forming a resonance space 142.
In the case of the present embodiment, the resonance space 142 is formed by the annular
portion 103, the resonance portion 104 and a part of the first baffle plate 118, and is a closed
space other than the opening 141 communicating with the sound path 110. ing.
[0027]
In addition, although the resonance part 104 is demonstrated as what forms the resonance space
142 with another member, you may form the resonance space 142 only by the resonance part
104. FIG.
[0028]
The size of the resonance space 142 formed in the closed state by the resonance section 104 and
the size of the opening 141 are arbitrarily determined in accordance with the frequency at which
the sound passing through the sound path 110 resonates. As in the embodiment, not only the
annular resonant space 142 surrounding the annular portion 103, but also a plurality of
partitioned resonant spaces 142 may be provided.
[0029]
Further, the number of the openings 141 is also arbitrary, but it is desirable to provide the
openings 141 in a plurality of places, and in the case where the openings 141 are provided in a
plurality of places, it is preferable to uniformly provide in the circumferential direction.
[0030]
In the case of the present embodiment, a sound absorption 143 (shown by fine dots in the
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drawing) is disposed in the resonance space 142 formed by the resonance portion 104.
Here, the sound absorbing material 143 is a member that amplifies the acoustic resistance, and is
made of a porous material.
Here, the term "porous" includes not only substances having bubbles in a dispersed state, such as
resin sponges, but also substances such as glass wool comprising entangled fibers.
By disposing the sound absorbing material 143 in the resonance space 142, it is possible to
control the degree of suppression of resonance by the resonance space 142.
[0031]
The second cabinet 121 is a member disposed inside the annular portion 103 and forming a
tubular sound path 110 with the annular portion 103.
The second cabinet 121 also functions as a housing for accommodating the second speaker unit
102 and forming an air chamber in the second speaker unit 102.
[0032]
In the case of the present embodiment, the second cabinet 121 is provided with a back surface
portion 122 (see FIG. 3) along the shape of the diaphragm on the surface of the first speaker unit
101 facing the diaphragm 112.
[0033]
The back surface portion 122 is disposed at a position where it does not interfere even when the
diaphragm 112 of the first speaker unit 101 vibrates to emit a sound.
Thereby, the sound radiated from the diaphragm 112 is effectively radiated to the outside of the
baffle plate through the sound path 110.
17-04-2019
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[0034]
In the case of the present embodiment, communication with the sound path 110 is made
between the first baffle plate 118 disposed on the front surface of the first cabinet 111 and the
second baffle plate 128 disposed on the entire surface of the second cabinet 121. The speaker
device 100 is such that the sound from the first speaker unit 101 is radiated to the outside
through the slit 130.
[0035]
In the case of the present embodiment, the diameter D (see FIG. 3) of the second baffle plate 128
is set to half or more of the wavelength calculated from the lower reproduction limit frequency of
the second speaker unit 102.
By setting in this manner, it is possible to flatten the overall sound pressure characteristics of the
sound emitted from the slit 130 and the sound emitted from the second speaker unit 102.
For example, to give a specific example, when the low-range regeneration limit frequency is fL =
2000 Hz, the 2000 Hz wavelength is 344/2000 = 170 mm (344 is the speed of sound).
Therefore, the diameter of the second baffle plate 128 is desirably 85 mm or more, which is half
the wavelength.
[0036]
Here, the low frequency reproduction limit frequency is the limit frequency of the low frequency
range that can be reproduced by the speaker unit, and as schematically shown in FIG. 5, the
sound pressure drops sharply as the reproduction frequency is lowered. The frequency fL at that
time is the low frequency reproduction limit frequency.
[0037]
Further, the diameter is the shortest distance of the distance from the point where the axis of the
second speaker unit 102 intersects with the surface in the plane including the front surface of
the second baffle plate 128 to the peripheral edge of the second baffle plate 128 It is described
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in the present specification and claims as being doubled.
[0038]
Further, by making the front surface of the first baffle plate 118 and the front surface of the
second baffle plate 128 flush with each other, the acoustic characteristics are improved.
Also, the second baffle plate 128 is integral with the first baffle plate 118.
That is, the first baffle plate 118 and the second baffle plate 128 are formed by forming the slits
130 penetrating in the thickness direction in one plate material.
Therefore, the slits 130 are not completely annular, but are separated by the connection portion
131 connecting the first baffle plate 118 and the second baffle plate 128.
[0039]
The second cabinet 121 and the second speaker unit 102 are held by the first baffle plate 118
fixed to the first cabinet 111 only via the second baffle plate 128, and the front of the first
speaker unit 101 is It is placed in position.
[0040]
As described above, according to the speaker device 100 in the present embodiment, the effect of
reducing the change in sound quality due to the listening position is exhibited as in the case of
the sound emitted from the point sound source, and the occurrence of intermodulation distortion
is suppressed. It is possible to emit high quality sound.
Specifically, while disposing the first speaker unit 101 and the second speaker unit 102 coaxially,
the sound generated from the first speaker unit 101 is radiated from a place separated from the
second speaker unit 102 by a predetermined distance. , To suppress the occurrence of
intermodulation distortion.
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In addition, while arranging the second cabinet 121 on the front surface of the first speaker unit
101, the first speaker unit 101 can be formed by making the surface of the second cabinet 121
facing the diaphragm 112 conform to the shape of the diaphragm 112. Can be efficiently led to
the sound path 110, and the sound of the first speaker unit 101 can be emitted from the slit with
high efficiency.
As described above, it is possible to achieve high sound quality of the sound emitted from the
speaker device 100 as a whole.
[0041]
The present invention is not limited to the above embodiment. For example, another embodiment
realized by arbitrarily combining the components described in the present specification and
excluding some of the components may be used as an embodiment of the present invention.
Further, modifications obtained by applying various modifications to those skilled in the art
without departing from the spirit of the present invention, that is, the meaning indicated by the
language described in the claims, are also included in the present invention. Be
[0042]
For example, the resonance space 142 may be present at least one of the outer side and the inner
side of the sound path 110. As shown in FIG. 6, the resonance space 142 existing inside the
sound path 110 may be formed closed by the second cabinet 121 and the second baffle plate
128 other than the opening 141. Furthermore, the resonance space 142 may be formed by the
baffle plate and the resonance portion 104 independent of the cabinet or the like.
[0043]
Further, as shown in FIG. 7, the diameter on the second speaker unit side of the sound path 110
may be larger than the diameter on the first speaker unit 101 side. Similarly, the annular portion
103 forming the sound path 110 is not limited to a cylindrical shape, and may be partially or
entirely conical.
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[0044]
Thus, the diameter of the second baffle plate 128 can be increased by gradually or continuously
increasing the diameter of the sound path 110 from the first speaker unit 101 toward the second
speaker unit 102. I can take a long time. Therefore, it is possible to lower the low-frequency
reproduction limit frequency fL where the sound radiated from the second speaker unit 102 in
charge of the high range becomes flat, and it is possible to improve the degree of freedom in the
design of the speaker device 100.
[0045]
In addition, the diameter of the second baffle plate 128 may be smaller than the diameter of the
diaphragm 112 of the first speaker unit 101.
[0046]
Although the shape of the diaphragm 112 of the first speaker unit 101 has been described as a
cone, the shape of the diaphragm of the speaker unit is not particularly limited, and may be a flat
diaphragm.
Further, the shape of the diaphragm may be not only circular or oval but also rectangular.
[0047]
Moreover, although it divided and demonstrated to the cabinet and the baffle board, these may
be integral, Moreover, the 1st baffle board 118 and the 2nd baffle board 128 are separate
members, and are joined by a joining member etc. I don't care.
[0048]
In addition, although the first cabinet 111 is described as an independent case, the first cabinet
111 may be shared with the case of an electronic device such as a television or a computer, and
may be shared with a structure of a moving object such as a car or aircraft You may share it.
[0049]
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The present invention can be applied to a speaker device that reproduces an audio signal such as
music.
[0050]
DESCRIPTION OF SYMBOLS 100 Speaker apparatus 101 1st speaker unit 102 2nd speaker unit
103 annular part 104 resonance part 110 sound path 111 1st cabinet 112 diaphragm 113 voice
coil 114 flame | frame 115 yoke 116 magnet 117 plate 118 1st baffle board 121 2nd cabinet
122 Back side 128 Second baffle plate 130 Slit 141 Opening 142 Resonant space 143 Sound
absorbing material
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