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DESCRIPTION JP2008109281
An object of the present invention is to obtain a speaker device capable of constructing a narrow
sound field and a wide sound field which can not be obtained from a single flat speaker without
using an electronic circuit and an amplifier of a special specification. A plurality of flat speakers 1
are arranged in at least one row in a storage unit 2. In addition, using Bessel function J (p), the
weight factor of the audio electrical signal applied to the N flat speakers 1 is determined, and the
N flat speakers 1 are arranged according to the weight factor. This makes it possible to construct
a narrow sound field or a wide sound field which can not be obtained from one flat loudspeaker.
[Selected figure] Figure 1
Speaker device
[0001]
The present invention relates to a speaker device configured using a flat speaker, and more
particularly to a speaker device capable of obtaining desired directivity.
[0002]
As a conventional speaker device, a speaker having directivity such as that represented by tone
zone is known.
The tone sss speaker makes it possible to obtain narrow directivity by utilizing the phenomenon
that sound is concentrated in a beam.
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[0003]
On the other hand, as a speaker device having wide directivity, the following speaker array has
been developed which can alleviate the narrowing of directivity due to the concentration of
sound in a beam shape. (1) A speaker array capable of actively controlling the phase of each
speaker by mounting a delay circuit (2) A speaker determining the arrangement and connection
of a plurality of cone-shaped speakers using a Bessel function ·array
[0004]
However, in a speaker array in which a delay circuit is implemented to actively control the phase
of each speaker, an electronic circuit such as an analog circuit or a digital circuit is necessary,
and control for each speaker is necessary. Therefore, when the number of speakers constituting
the array increases, the electronic circuit may become complicated and large, and the speaker
device may become expensive. On the other hand, a speaker array that uses Bessel functions to
determine the arrangement and connection of a plurality of cone-shaped speakers can have wide
directivity, but due to the structure of the cone-shaped speaker, it has peak characteristics with
high frequency band frequency characteristics. Because of the dip, the broad-range directivity
may deteriorate. In the case of a cone-shaped speaker, the impedance is generally 4 to 8 Ω, and
if the arrangement of the cone-shaped speaker is performed with the same impedance, the
impedance becomes high, so that driving is difficult with a normal amplifier.
[0005]
In addition to the above speaker devices, a speaker device consisting of a single flat speaker has
been developed (see, for example, Patent Documents 1 and 2). That is, in the flat speaker housed
in the speaker device, a flat plate-like yoke in which S poles and N poles of permanent magnets
are alternately arranged, and a flexible substrate on which a voice coil to which an electric signal
is applied are formed. When the electric signal is applied to the input terminal of the voice coil,
the flexible substrate vibrates by receiving a force according to Fleming's left hand rule.
[0006]
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In the case of a speaker device consisting of a single flat speaker, it is possible to realize a low
impedance of 2 Ω or less, which is difficult to realize with a cone-type speaker, so the speaker
device can be driven even without using special amplifiers or audio transformers. Becomes
possible. Further, in the case of a speaker device including a flat speaker, it is possible to reduce
the peak dip that occurs in the frequency characteristic of the high sound band, so that a flat
sound range can be secured up to the high frequency.
[0007]
WO 00/078095 JP-A-2001-333493 (Paragraphs [0018] to [0019], FIG. 1)
[0008]
Since the conventional speaker device is configured as described above, the use of a flat speaker
can realize a low impedance of 2 Ω or less and can reduce the peak dip occurring in the
frequency characteristic of the high sound band. .
However, even if one flat loudspeaker is mounted, the sound field is limited because the sound
pressure is low, and there is a problem that the directivity of a desired width can not be obtained.
[0009]
The present invention has been made to solve the above-mentioned problems, and without using
an electronic circuit or a special-purpose amplifier, a narrow sound field or a wide sound field
which can not be obtained from a single flat speaker can be constructed. The purpose is to obtain
a speaker device that can
[0010]
The speaker device according to the present invention has a plurality of flat speakers arranged in
at least one row in the storage unit.
[0011]
According to the present invention, since the plurality of flat speakers are arranged in at least
one row in the storage portion, the electronic circuit and the amplifier of the special specification
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are not used, and narrowness can not be obtained from one flat speaker. There is an effect that
can construct a sound field or a wide sound field.
[0012]
Embodiment 1
FIG. 1 is a block diagram showing a speaker device according to Embodiment 1 of the present
invention.
In the figure, the flat speaker 1 is a member that radiates sound by vibrating an internal
diaphragm described later.
The storage unit 2 stores a plurality of flat speakers 1.
[0013]
FIG. 2 is a block diagram showing a flat loudspeaker 1 of the loudspeaker apparatus according to
Embodiment 1 of the present invention. In particular, FIG. 2 (a) is a plan view showing the flat
loudspeaker 1 of the loudspeaker apparatus according to the first embodiment of the present
invention, and FIG. 2 (b) is a cross section showing the flat loudspeaker 1 of the loudspeaker
apparatus according to the first embodiment of the present invention FIG. Moreover, FIG.2 (c) is a
top view of the planar speaker 1 when it sees from the position of AA of FIG.2 (b). In the drawing,
the yoke 11 is a flat magnet plate in which the S pole and the N pole of the permanent magnet
12 are alternately arranged. A spacer 13 for holding the flexible substrate 21 is formed at the
edge portion of the yoke 11 in order to keep the distance between the permanent magnet 12 and
the voice coil 23 constant, and a plurality of holes 14 is formed at the center portion. It has been
subjected.
[0014]
The flexible substrate 21 is a diaphragm which is disposed to face the yoke 11 and in which the
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spiral voice coil 23 to which a voice electrical signal is applied is etched, and a voice electrical
signal is applied to the signal input terminal 22 of the voice coil 23 When it vibrates under the
force of Fleming's left-hand rule. The spiral voice coil 23 is disposed at a position where it
receives a force according to Fleming's left hand rule with the magnet plate 12 when an audio
electrical signal is given from the signal input terminal 22.
[0015]
Next, the operation will be described. When a voice electric signal is applied from the signal input
terminal 22 of the voice coil 23, a force according to the left-hand rule of Fleming acts between
the permanent magnet 12 and the voice coil 23. Thereby, the flexible substrate 21 in which the
voice coil 23 is etched vibrates to generate a sound. The sound generated from the flexible
substrate 21 is radiated from the hole 14 of the yoke 11. Since the plurality of flat speakers 1 are
stored in the storage unit 2 in a state in which the front surface is open and the back surface is
closed, the direction of the sound radiated from the speaker device is the direction of the arrow
shown in FIG.
[0016]
In the loudspeaker apparatus of FIG. 1, although 25 (= 5 × 5) flat loudspeakers 1 are arranged,
when all the weight factors of the audio electrical signal applied to the 25 flat loudspeakers 1 are
the same, The directional characteristics of the device become narrow directional. Here, FIG. 3 is
an explanatory view showing an acoustic simulation of the speaker device, and FIG. 4 is an
explanatory view showing the arrangement, connection, and directivity characteristics of 25 flat
speakers 1. In the example of FIG. 4A, five flat speakers 1 are arranged in five rows, but the
weighting factors of the audio electrical signal applied to the 25 flat speakers 1 are all the same.
That is, the directions of the audio electrical signals applied to the 25 flat speakers 1 are all the
same (positive phase), and all the sizes are the same ("1"). FIG. 4B shows that 25 planar speakers
1 are connected in series in order to make all the weighting factors of the audio electrical signal
applied to the 25 planar speakers 1 the same.
[0017]
When an acoustic simulation of the loudspeaker apparatus in which 25 flat speakers 1 are
arranged as described above is performed, an acoustic simulation result as shown in (Example 1)
of FIG. 3 is obtained, and the flat speaker 1 is used alone Rather, both the longitudinal direction
and the lateral direction have narrow directivity (see FIG. 4C).
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[0018]
As is apparent from the above, according to the first embodiment, the plurality of flat speakers 1
are arranged in at least one row in the storage portion 2, and therefore, a narrow width which
can not be obtained from one flat speaker 1 is obtained. You will be able to build a sound field.
As a result, since the sound field is not formed in the periphery other than the target place, the
effect of being able to enhance the noise suppression effect is achieved.
[0019]
Second Embodiment In the first embodiment, the plurality of flat speakers 1 are arranged in at
least one row in the storage unit 2 to construct a narrow sound field which can not be obtained
from one flat speaker 1. In order to be able to have wide directivity in both the horizontal and
horizontal directions, use Bessel functions to determine the weight factors of the audio electrical
signal applied to N (for example, N = 25) planar speakers 1 Alternatively, the N flat speakers 1
may be arranged in accordance with the weight factor. Specifically, it is as follows.
[0020]
By determining the weight factor of the electrical electrical signal to be applied to the N cone
speakers using the Bessel function and arranging the N cone speakers according to the weight
factor, the sound pressure distribution of the speaker device becomes radial. It is known to be.
However, as described above, in the cone-type speaker, the peak dip occurs in the frequency
characteristic of the high sound band due to the structure, so that the broad band directivity may
be deteriorated. Therefore, if the weighting factor of the electrical signal to be applied to the N
planar speakers 1 is determined using the Bessel function, and the N planar speakers 1 are
arranged according to the weighting factors, the sound pressure distribution of the speaker
device can be obtained. It is understood that it becomes radial.
[0021]
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For example, an m-th order Bessel function Jm (p) satisfying the differential equation of the
following equation (1) is used as the Bessel function. d <2> u / dp <2> + (1 / p) du / dp + (1-m
<2> / p <2>) u = 0 (1) Jm (p) = (p / 2) <m > Σ (−p <2> / 4) <k> / [k! （ｍ＋ｋ）！ (2) where Σ
is a mathematical symbol indicating the sum from k = 0 to ∞.
[0022]
In addition, since the Bessel function Jm (p) has a property of satisfying the following equation
(3), the weighting factor of the audio electrical signal applied to the m-th flat loudspeaker 1 is Jm
(p). Σ Jm (p) exp (j mx) = exp exp (jp sin x) = 1 1 (3) where Σ is a mathematical symbol
indicating the sum from m = -∞ to ∞. The directivity pattern of the speaker apparatus consisting
of an infinite number of speakers is the same as that of one speaker, and if the parameter p is
selected sufficiently small, the same holds true for the speaker apparatus consisting of a finite
number of flat speakers 1 . For example, in a speaker apparatus including five flat speakers 1, if p
= 1.5 is selected, the weighting factor of the audio electrical signal applied to the five flat
speakers 1 is approximately 1: 2: 2: -2. : 1.
[0023]
FIG. 5 is an explanatory view showing the arrangement, connection, and directivity characteristic
of twenty-five flat speakers 1 of the speaker apparatus according to Embodiment 2 of the present
invention. The weighting factor of the electrical electrical signal to be applied to the 25 planar
speakers 1 is determined using the m-th order Bessel function Jm (p), as shown in FIG. 5A. For
example, the weighting factor of the audio electrical signal applied to the planar speaker 1 of
arrangement A1 is +1 , the weighting factor of the audio electrical signal applied to the
planar speaker 1 of arrangement B2 is +4 , the arrangement is C4 The weighting factor of the
audio electrical signal applied to the planar speaker 1 is "-4", and the weighting factor of the
audio electrical signal applied to the planar loudspeaker 1 of the arrangement D5 is determined
as "-2".
[0024]
FIG. 5 (b) shows that 25 planar speakers 1 are arranged in accordance with the above-mentioned
weight factor. For example, with regard to the planar speakers 1 whose arrangement is A1, E1,
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A5, and E5, by connecting in parallel without inverting the polarity, each planar speaker 1 forms
a block for realizing the driving force of +1 . . For example, with regard to the planar speakers
1 whose arrangement is B1 and C1, by connecting them in parallel without inverting the polarity,
each planar speaker 1 forms a block for realizing the driving force of +2 . For example, for
the planar speaker 1 whose arrangement is D1 and A2, the polarity of the planar speaker 1
whose arrangement is D1 is reversed, and the polarity of the planar speaker 1 whose
arrangement is A2 is not reversed but connected in parallel. The flat speaker 1 forms a block for
realizing a driving force of −2 , and the flat speaker 1 of A2 realizes a driving force of
+2 . For example, in the case of the planar speaker 1 whose arrangement is B2, by connecting
without inverting the polarity, a block for realizing the +4 driving force is formed. For
example, in the case of the planar speaker 1 whose arrangement is D2, a block for realizing a
driving force of −4 is formed by inverting and connecting the polarity. In the example of
FIG. 5 (b), the twenty-five flat loudspeakers 1 are arrayed by forming sixteen blocks and
connecting the sixteen blocks in series in the same manner.
[0025]
When an acoustic simulation of the speaker apparatus in which 25 flat speakers 1 are arranged
as described above is performed, an acoustic simulation result as shown in (Example 3) of FIG. 3
is obtained, and the flat speaker 1 is used alone Rather, both the longitudinal direction and the
transverse direction have wide directivity (see FIG. 5 (c)).
[0026]
As is apparent from the above, according to the second embodiment, the weighting factor of the
audio electrical signal applied to the N planar speakers 1 is determined using the Bessel function
Jm (p), and the weighting factor is determined according to the weighting factor. Since the N flat
speakers 1 are arranged, the effect of being able to construct a wide sound field can be achieved
without using an electronic circuit or a special-purpose amplifier.
[0027]
Third Embodiment
In the second embodiment described above, a speaker device in which 25 planar speakers 1 are
arranged and directivity is wide in both the vertical direction and the horizontal direction is
shown. However, as shown in FIG. 1 may be arranged to obtain a speaker device in which the
directivity in the longitudinal direction is narrow and the directivity in the lateral direction is
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wide.
[0028]
FIG. 6 is an explanatory view showing the arrangement, connection, and directivity characteristic
of the five flat speakers 1 of the speaker device according to the third embodiment of the present
invention.
The weighting factor of the audio electrical signal applied to the five planar speakers 1 is
determined using the m-th order Bessel function Jm (p), as shown in FIG. In the example of FIG.
6A, the weighting factor of the audio electrical signal applied to the planar speaker 1 of
arrangement A1 is "+1", and the weighting factor of the audio electrical signal applied to the
planar speaker 1 of arrangement B1 is "1. The weighting factor of the audio electrical signal
applied to the flat speaker 1 of +2 ′ ′ placed at C1 is +2 , the weighting factor of the audio
electrical signal applied to the flat loudspeaker 1 placed at 1 is −2 , the placement is
The weighting factor of the audio electrical signal applied to the flat loudspeaker 1 of E1 is
determined as "+1".
[0029]
FIG. 6 (b) shows that five flat speakers 1 are arranged in accordance with the above-mentioned
weight factor. The planar speakers 1 arranged in A1 and E1 are connected in parallel without
inverting the polarity to form a block in which the respective planar speakers 1 realize a driving
force of +1 . In the case of the planar speaker 1 whose arrangement is B1 (C1), a block for
realizing the +2 driving force is formed by connecting without inverting the polarity. With
regard to the planar speaker 1 whose arrangement is D1, a block for realizing a driving force of
−2 is formed by inverting and connecting the polarity. In the example of FIG. 6 (b), the five
flat speakers 1 are arranged by forming the four blocks as described above and connecting the
four blocks in series.
[0030]
When an acoustic simulation of the speaker apparatus in which the five flat speakers 1 are
arranged as described above is performed, an acoustic simulation result as shown in (Example 2)
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of FIG. 3 is obtained, and the flat speaker 1 is used alone Rather, it has directivity that is wider
only in the lateral direction (see FIG. 6C). According to the third embodiment, since directivity
can be wide only in the lateral direction, an effect of being able to construct a wide sound field
while suppressing noise in the longitudinal direction is achieved.
[0031]
Fourth Embodiment In the above-mentioned second embodiment, the 25 planar speakers 1 are
arranged, and a speaker apparatus having wide directivity in both the vertical direction and the
horizontal direction is shown. However, as shown in FIG. 1 may be arranged to obtain a speaker
device having wide directivity in both the longitudinal direction and the lateral direction.
[0032]
FIG. 7 is an explanatory view showing the arrangement, connection, and directivity characteristic
of the 36 flat speakers 1 of the speaker device according to the fourth embodiment of the
present invention. However, although the arrangement of 49 flat speakers 1 is shown in FIG. 7A,
the flat speakers 1 having a weighting factor of "0" are not actually arranged (for example, flat
speakers such as A4, D1, etc. 1 is not disposed), 36 planar speakers 1 are disposed.
[0033]
The weighting factor of the audio electrical signal applied to the 49 flat loudspeakers 1 is
determined using the m-th order Bessel function Jm (p), as shown in FIG. 7A. For example, the
weighting factor of the audio electrical signal applied to the planar speaker 1 of arrangement A1
is +1 , the weighting factor of the audio electrical signal applied to the planar speaker 1 of
arrangement B2 is +4 , the arrangement is C4 The weighting factor of the audio electrical
signal applied to the planar speaker 1 is 0 , and the weighting factor of the audio electrical
signal applied to the planar loudspeaker 1 having the arrangement of E 2 is determined as
−4 .
[0034]
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FIG. 7 (b) shows that 36 planar speakers 1 are arranged in accordance with the above-mentioned
weight factor. For example, for the planar speakers 1 whose arrangement is A1, G1, A7, G7, the
polarity of the planar speakers 1 whose arrangement is G1, A7 is reversed, and the polarities of
the planar speakers 1 whose arrangement is A1, G7 are not reversed By connecting them to each
other, the flat speakers 1 of G1 and A7 form a block for realizing the driving force of "+1", and
the flat speakers 1 of A1 and G7 realize a driving force of "+1". For example, with regard to the
planar speakers 1 whose arrangement is B1 and C1, by connecting them in parallel without
inverting the polarity, each planar speaker 1 forms a block for realizing the driving force of
+2 . For example, for the planar speaker 1 with the arrangement E1, F1, the polarity of the
planar speaker 1 with the arrangement E1 is reversed, and the polarity of the planar speaker 1
with the arrangement F1 is not reversed, but connected in parallel. The flat speaker 1 forms a
block for realizing the driving force of −2 and the flat speaker 1 of F 1 realizes the +2
driving force. For example, in the case of the planar speaker 1 whose arrangement is B2, by
connecting without inverting the polarity, a block for realizing the +4 driving force is formed.
For example, in the case of the planar speaker 1 having the arrangement of E2, a block for
realizing a driving force of −4 is formed by inverting and connecting the polarity. In the
example of FIG. 7 (b), the 36 flat loudspeakers 1 are arrayed by forming 25 blocks and
connecting the 25 blocks in series in the same manner.
[0035]
When the acoustic simulation of the speaker apparatus in which the 36 flat speakers 1 are
arranged as described above is carried out, both the longitudinal direction and the horizontal
direction have wide directivity as in the speaker apparatus of the second embodiment. become.
However, since the speaker device according to the fourth embodiment has more flat speakers 1
than the speaker device according to the second embodiment, it is necessary to obtain a larger
sound pressure than the speaker device according to the second embodiment. Can. Therefore, an
effect that can construct a wider sound field is produced.
[0036]
Embodiment 5 In the third embodiment described above, the five flat speakers 1 are arranged to
show a speaker device having a narrow directivity in the vertical direction and a wide directivity
in the horizontal direction. However, as shown in FIG. The flat loudspeakers 1 may be arranged
to obtain a loudspeaker apparatus having a narrow directivity in the vertical direction and a wide
directivity in the lateral direction.
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[0037]
FIG. 8 is an explanatory view showing the arrangement, connection, and directivity characteristic
of six flat speakers 1 of the speaker apparatus according to the fifth embodiment of the present
invention. However, although FIG. 8A shows the arrangement of seven flat speakers 1, the flat
speaker 1 with a weighting factor of "0" is not actually arranged (the flat speaker 1 of D1 is not
arranged). , Six flat speakers 1 are arranged.
[0038]
The weighting factor of the audio electrical signal applied to the seven planar speakers 1 is
determined using the m-th order Bessel function Jm (p), as shown in FIG. In the example of FIG.
8A, the weighting factor of the audio electrical signal applied to the planar speaker 1 of
arrangement A1 is "+1", and the weighting factor of the audio electrical signal applied to the
planar speaker 1 of arrangement B1 is "1. The weighting factor of the audio electrical signal
applied to the flat loudspeaker 1 of +2 ′ ′ arrangement is C1 is +2 , the weighting factor of
the audio electrical signal applied to the flat loudspeaker 1 of arrangement is 0 , the
arrangement is E1 The weighting factor of the audio electrical signal applied to the flat
loudspeaker 1 is "-2", the weighting factor of the audio electrical signal applied to the planar
loudspeaker 1 of F1 is "+2", and the disposition of the flat loudspeaker 1 is G1. The weighting
factor of the applied audio electrical signal is determined as "-1".
[0039]
FIG. 8 (b) shows that six flat speakers 1 are arranged in accordance with the above-mentioned
weight factor. With regard to the planar speakers 1 whose arrangement is A1 and G1, the planar
speaker 1 whose arrangement is A is not reversed in polarity, and the polarity of the planar
speakers 1 whose arrangement is G1 is reversed and connected in parallel. The flat speaker 1 of
"1" for the speaker 1 and the flat speaker 1 of G1 form a block for realizing the driving force of "1". For the planar speaker 1 whose arrangement is B1 (C1, F1), blocks are realized to realize the
+2 driving force by connecting without inverting the polarity. With regard to the planar
speaker 1 having the arrangement of E1, the blocks are formed to realize the driving force of
−2 by connecting in reverse polarity. In the example of FIG. 8 (b), six flat speakers 1 are
arranged by forming five blocks as described above and connecting five blocks in series.
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[0040]
When the acoustic simulation of the speaker device in which the six flat speakers 1 are arranged
as described above is performed, as in the speaker device of the third embodiment, the directivity
is wide only in the lateral direction. According to the fifth embodiment, since directivity can be
wide only in the horizontal direction, an effect that a wide sound field can be constructed while
noise in the vertical direction is suppressed can be achieved. In addition, since the speaker
apparatus of this Embodiment 5 carries more planar speakers 1 than the speaker apparatus of
the said Embodiment 3, it obtains larger sound pressure than the speaker apparatus of the said
Embodiment 3. Can.
[0041]
Sixth Embodiment In the above-mentioned second embodiment, the 25 planar speakers 1 are
arranged, and a speaker apparatus having wide directivity in both the vertical direction and the
horizontal direction is shown. However, as shown in FIG. 1 may be arranged to obtain a speaker
device having wide directivity in both the longitudinal direction and the lateral direction.
[0042]
FIG. 9 is an explanatory view showing the arrangement, connection, and directivity characteristic
of the 49 flat speakers 1 of the speaker apparatus according to the sixth embodiment of the
present invention. However, although the arrangement of 81 flat speakers 1 is shown in FIG. 9A,
the flat speakers 1 having a weighting factor of 0 are not actually arranged (for example, the
flat speakers of A4, D1, etc. 1 is not disposed), 49 planar speakers 1 are disposed.
[0043]
The weighting factor of the audio electrical signal applied to the 81 flat speakers 1 is determined
using the m-th order Bessel function Jm (p), as shown in FIG. 9A. For example, the weighting
factor of the audio electrical signal applied to the planar speaker 1 of arrangement A1 is +1 ,
the weighting factor of the audio electrical signal applied to the planar speaker 1 of arrangement
B2 is +4 , the arrangement is C4 The weighting factor of the audio electrical signal applied to
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the planar speaker 1 is 0 , and the weighting factor of the audio electrical signal applied to
the planar loudspeaker 1 having the arrangement of E 2 is determined as −4 .
[0044]
FIG. 9 (b) shows that 49 flat speakers 1 are arranged in accordance with the above-mentioned
weight factor. For example, as for the planar speakers 1 whose arrangement is A1, I1, A9, and I9,
by connecting in parallel without inverting the polarity, each planar speaker 1 forms a block for
realizing the driving force of +1 . . For example, with regard to the planar speakers 1 whose
arrangement is B1 and C1, by connecting them in parallel without inverting the polarity, each
planar speaker 1 forms a block for realizing the driving force of +2 . For example, for the
planar speaker 1 with the arrangement E1, G1, the polarity of the planar speaker 1 with the
arrangement E1 is reversed, and the polarity of the planar speaker 1 with the arrangement G1 is
connected in parallel without reversing the polarity. The flat speaker 1 forms a block for realizing
the driving force of −2 and the flat speaker 1 of G1 realizes the +2 driving force. For
example, in the case of the planar speaker 1 whose arrangement is B2, by connecting without
inverting the polarity, a block for realizing the +4 driving force is formed. For example, in the
case of the planar speaker 1 having the arrangement of E2, a block for realizing a driving force of
−4 is formed by inverting and connecting the polarity. In the example of FIG. 9 (b), 49
planar loudspeakers 1 are arrayed by forming 36 blocks and connecting 36 blocks in series in
the same manner.
[0045]
When the acoustic simulation of the speaker apparatus in which the 49 flat speakers 1 are
arranged as described above is carried out, both of the longitudinal direction and the horizontal
direction have wide directivity as in the speaker apparatus of the second embodiment. become.
However, since the speaker apparatus of the sixth embodiment has more planar speakers 1 than
the speaker apparatus of the second embodiment, it is necessary to obtain a larger sound
pressure than the speaker apparatus of the second embodiment. Can. Therefore, an effect that
can construct a wider sound field is produced.
[0046]
Embodiment 7 In the above-described third embodiment, five flat speakers 1 are arranged to
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show a speaker device having a narrow directivity in the vertical direction and a wide directivity
in the horizontal direction. However, as shown in FIG. The flat loudspeakers 1 may be arranged
to obtain a loudspeaker apparatus having a narrow directivity in the vertical direction and a wide
directivity in the lateral direction.
[0047]
FIG. 10 is an explanatory view showing the arrangement, connection, and directivity
characteristic of seven flat speakers 1 of the speaker apparatus according to the seventh
embodiment of the present invention. However, although the arrangement of nine flat speakers 1
is shown in FIG. 10A, since the flat speakers 1 having a weighting factor of "0" are not actually
arranged (the flat speakers 1 of D1 and F1 are arranged No), 7 flat speakers 1 are arranged.
[0048]
The weighting factor of the audio electrical signal applied to the nine planar speakers 1 is
determined using the m-th order Bessel function Jm (p), as shown in FIG. In the example of FIG.
10 (a), the weighting factor of the audio electrical signal applied to the planar speaker 1 of
arrangement A1 is "+1", and the weighting factor of the audio electrical signal applied to the
planar speaker 1 of arrangement B1 is "1. The weighting factor of the audio electrical signal
applied to the flat loudspeaker 1 of +2 ′ ′ arrangement is C1 is +2 , the weighting factor of
the audio electrical signal applied to the flat loudspeaker 1 of arrangement is 0 , the
arrangement is E1 The weighting factor of the audio electrical signal applied to the flat
loudspeaker 1 is −2 , the weighting factor of the audio electrical signal applied to the flat
loudspeaker 1 of the arrangement is 0 , the planar loudspeaker 1 of the arrangement is G1
The weighting factor of the audio electrical signal to be applied is "+2", and the weighting factor
of the audio electrical signal applied to the planar speaker 1 of H1 is "-2", the audio electrical
signal applied to the planar speaker 1 of I1 Signal weighting factor is "+1" Are sea urchin
determined.
[0049]
FIG. 10 (b) shows that seven planar speakers 1 are arranged in accordance with the abovementioned weight factor. The planar speakers 1 arranged in the arrangement of A1 and I1 are
connected in parallel without inverting the polarity to form a block in which the respective
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planar speakers 1 realize a driving force of +1 . For the planar speaker 1 whose arrangement
is B1 (C1, G1), a block that realizes a driving force of +2 is formed by connecting without
inverting the polarity. For the planar speaker 1 whose arrangement is E1 (H1), a block for
realizing a driving force of −2 is formed by inverting and connecting the polarity. In the
example of FIG. 10B, seven flat speakers 1 are arranged by forming six blocks as described above
and connecting six blocks in series.
[0050]
When the acoustic simulation of the speaker device in which the seven flat speakers 1 are
arranged as described above is performed, as in the speaker device of the third embodiment, the
directivity is wide only in the lateral direction. According to the seventh embodiment, since
directivity can be wide only in the lateral direction, an effect of being able to construct a wide
sound field while suppressing noise in the longitudinal direction is achieved. In addition, since
the speaker apparatus of this Embodiment 7 mounts the flat speaker 1 more than the speaker
apparatus of the said Embodiment 3, it obtains larger sound pressure than the speaker apparatus
of the said Embodiment 3. Can.
[0051]
Eighth Embodiment FIG. 11 is an explanatory drawing showing the arrangement, connection, and
directivity characteristic of the five flat speakers 1 of the speaker device according to the eighth
embodiment of the present invention. In the eighth embodiment, the directivity in the
longitudinal direction is always narrow so that the directivity in the lateral direction can be
changed as necessary. The lower side of FIG. 11A shows an example in which the weighting
factors of the audio electrical signals applied to the five planar speakers 1 are all the same (+1) in
order to narrow the directivity in the lateral direction. There is. On the other hand, in the upper
part of FIG. 11A, in order to widen the directivity in the lateral direction, five planar speakers 1
are obtained using m-th order Bessel function Jm (p) as in the third embodiment. An example is
shown in which the weighting factor of the audio electrical signal applied to the signal is
determined.
[0052]
FIG. 11 (b) shows that five flat speakers 1 are arranged in accordance with the above-mentioned
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weight factor. Four switches (switch) 31, 32, 33, 34 are implemented to realize the case of
narrowing the directivity in the lateral direction and the case of widening the lateral direction in
one circuit. . When the four switches 31, 32, 33, 34 are switched to the N side, the five flat
speakers 1 are connected in series in the order of A1 → E1 → B1 → C1 → D1.
[0053]
When the four switches 31, 32, 33, and 34 are switched to the W side, the flat speakers 1 whose
arrangement is A1 and E1 are connected in parallel, and a block having a driving force of "+1" is
formed. . Then, the planar speaker 1 with a driving power of +2 is connected in the order of
B1 → C1 → D1 (the polarity of the planar speaker 1 of D1 is inverted) in series with the block
consisting of the planar speakers 1 of A1 and E1. Ru.
[0054]
By this, if the four switches 31, 32, 33, 34 are switched to the W side, the directivity in the lateral
direction can be broadened, and if the four switches 31, 32, 33, 34 are switched to the N side,
the lateral The directivity of the direction can be narrowed. Therefore, according to the eighth
embodiment, the directivity of the speaker device can be changed according to the application, so
that the utility value of the speaker device can be enhanced.
[0055]
It is a block diagram which shows the speaker apparatus by Embodiment 1 of this invention. It is
a block diagram which shows the planar speaker of the speaker apparatus by Embodiment 1 of
this invention. It is explanatory drawing which shows the acoustic simulation of the speaker
apparatus by Embodiment 1 of this invention. It is explanatory drawing which shows
arrangement ¦ positioning of 25 planar speakers of the speaker apparatus by Embodiment 1 of
this invention, connection, and a directional characteristic. It is explanatory drawing which shows
arrangement ¦ positioning of 25 planar speakers of the speaker apparatus by Embodiment 2 of
this invention, connection, and a directional characteristic. It is explanatory drawing which shows
arrangement ¦ positioning of 5 flat speakers of the speaker apparatus by Embodiment 3 of this
invention, connection, and a directional characteristic. It is explanatory drawing which shows
arrangement ¦ positioning of 36 planar speakers of the speaker apparatus by Embodiment 4 of
this invention, connection, and a directional characteristic. It is explanatory drawing which shows
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arrangement ¦ positioning of six flat speakers of the speaker apparatus by Embodiment 5 of this
invention, a connection, and a directional characteristic. It is explanatory drawing which shows
arrangement ¦ positioning of 49 flat speakers of the speaker apparatus by Embodiment 6 of this
invention, connection, and a directional characteristic. It is explanatory drawing which shows
arrangement ¦ positioning of seven planar speakers of the speaker apparatus by Embodiment 7
of this invention, connection, and a directional characteristic. It is explanatory drawing which
shows arrangement ¦ positioning of five flat speakers of the speaker apparatus by Embodiment 8
of this invention, a connection, and a directional characteristic.
Explanation of sign
[0056]
DESCRIPTION OF SYMBOLS 1 planar speaker, 2 accommodating parts, 11 yoke (flat-plate-like
magnet board), 12 permanent magnets, 13 spacers, 14 holes, 21 flexible substrates (diaphragm),
22 signal input terminals, 23 voice coils, 31, 32, 33 , 34 switch (switch).
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