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JP2015216496

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DESCRIPTION JP2015216496
PROBLEM TO BE SOLVED: With a flat original plate having a distribution of density in a plane, it
is difficult to generate a uniform reflected sound in the plane even if only the outer edge shape is
processed into a target shape. SOLUTION: The surface of a flat original plate is scraped to obtain
a diaphragm, and feature data obtained by integrating vibration intensity with respect to a
frequency for a predetermined time is acquired at 5 to 9 places in the plane, and each acquired
feature data is A method of determining an acoustic diaphragm and a method of manufacturing
an acoustic diaphragm, characterized in that it is determined that the acoustic diaphragm realizes
an in-plane uniform vibration state by the appearance of a feature peak at a common frequency
position. provide. [Selected figure] Figure 4
Method of determining acoustic diaphragm, and method of manufacturing acoustic diaphragm
using this determination method
[0001]
The present invention relates to a method of determining an acoustic diaphragm, and more
particularly to a method of determining an acoustic diaphragm used for a resonance plate of a
musical instrument or an enclosure of an audio device, and a method of manufacturing an
acoustic diaphragm using this determination method.
[0002]
Conventionally, in designing and manufacturing an acoustic diaphragm, a flat plate material as a
material is designed after designing a shape that is optimum for each resonance plate of an
instrument or an enclosure of an audio device in which the acoustic diaphragm is to be used. It
has been carried out by processing it into a shape and incorporating it.
12-05-2019
1
[0003]
Japanese Patent Application Laid-Open No. 3-235600
[0004]
However, for example, there is a violin that has already been given high marks for being able to
play sounds of excellent sound quality, and even if you create a resonance plate of the same
shape as the violin and assemble the violin, the sound of the same excellent sound quality Was
not necessarily a violin that played
[0005]
The acoustic diaphragm receives the sound, vibrates the outer edge of the acoustic diaphragm as
a fixed end, and reflects the sound when the incorporated instrument or audio device makes a
sound.
However, although various flat plate materials such as a wood board, a resin board, or a metal
plate or a combination of these are used as the acoustic diaphragm, the density inside the flat
plate is not completely uniform, It is normal to have a distribution in the plane.
[0006]
Since the distribution of density in the flat plate material causes the tendency of the vibration
intensity of the reflected sound to differ with respect to the frequency to be different in the
plane, an acoustic diaphragm in which only the outer edge shape of the flat plate material is
processed into a desired shape It was difficult to generate a uniform reflected sound in the plane
even using.
[0007]
Then, the determination method of the acoustic diaphragm concerning this invention as means
for solving the said subject grinds the outer surface of a flat original plate, forms a diaphragm,
and was made to contact the part in the surface center part of the said diaphragm. A sample
sound having a plurality of frequencies continuously transmitted from the sound source to the
piezoelectric speaker for a predetermined time through the speaker is generated from the
diaphragm, and the sample sound is spaced apart from the piezoelectric speaker by a
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2
predetermined distance. From the sound collection microphone installed at the same time and
convert it into sound information which is an electric signal, and transmits the sound information
collected by the sound collection microphone to the information processing unit, and the
information processing unit The characteristic data obtained by integrating the vibration
intensity with respect to the predetermined time is acquired, and the characteristic data is
surrounded by the center of gravity of the diaphragm at the surface central portion of the
diaphragm. Obtained in several places, each feature data acquired, and judging that by appearing
characteristic peaks in common frequency position is an acoustic diaphragm to achieve a
uniform vibration state in a plane.
[0008]
Further, in the method of manufacturing an acoustic diaphragm according to the present
invention, a forming step of scraping the outer surface of a flat original plate to form a
diaphragm, and a piezoelectric speaker in contact with a part of the surface center of the
diaphragm Sample sound having a plurality of frequencies continuously sent from the sound
source to the piezoelectric speaker for a predetermined time is generated from the diaphragm,
and the sample sound is disposed at a position separated by a predetermined distance from the
piezoelectric speaker The sound information captured by the sound collection microphone is
converted into sound information which is an electrical signal, and the sound information
collected by the sound collection microphone is transmitted to the information processing unit,
and the information processing unit analyzes the vibration intensity of the sound information
with respect to the frequency The characteristic data obtained by integrating for the
predetermined time is acquired, and the characteristic data is taken at several places around the
center of gravity of the diaphragm at the surface central portion of the diaphragm. In each of the
acquired feature data, it is characterized by comprising a determination step of determining that
the acoustic diaphragm realizes an in-plane uniform vibration state by the appearance of a
feature peak at a common frequency position. .
[0009]
In the present invention, the tendency of the vibration intensity of the reflected sound to the
frequency is referred to as a vibration state.
[0010]
The flat original plate is preferably a wood board, a resin board, a metal board, or a plywood
obtained by combining these.
[0011]
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In the present invention, the flat plate plate means a plate plate in a state processed into an outer
edge shape required as a resonance plate of a musical instrument or an enclosure of an audio
device, and using the flat plate plate as it is as an enclosure of a musical instrument or an audio
device It means something that can be assembled.
[0012]
On the other hand, the diaphragm in the present invention refers to the one in which the surface
of the flat plate is scraped in the thickness direction.
By shaving the surface of the plate-like original plate in the thickness direction, it is possible to
eliminate the phenomenon that the vibration state differs in the plane due to the in-plane density
distribution of the plate-like original plate.
However, even if it is a flat original plate made of the same material at first glance, the density
distribution in the plane is different for each flat original plate, and therefore the position to cut
the surface and the amount of shaving differ depending on the flat original.
[0013]
The sound source is a sound having a plurality of frequencies, and the vibration intensity with
respect to each frequency changes continuously with time.
Therefore, it is preferable that the sound source be music data recorded on a magnetic tape, a
compact disc (CD), a hard disk, a flash memory or the like.
Preferably, the sound source can be sent as an electrical signal to the piezoelectric speaker via
the player and an amplifier.
The sound source is preferably classical music or the like because the characteristic data can be
easily compared as the frequency range is wider.
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[0014]
A piezoelectric speaker is an element capable of generating sound by vibrating a vibrating body
corresponding to a sound source together with a piezoelectric element and vibrating an object
contacted by the vibrating body, and in the present invention, as a piezoelectric speaker in
general It is possible to use one having a typical structure.
In the present invention, the vibrator is brought into contact with the diaphragm to generate
sound, but an adhesive tape may be used between the vibrator and the diaphragm for fixing the
piezoelectric speaker and the diaphragm.
[0015]
The surface central portion of the diaphragm refers to the inner portion of the outer edge of the
diaphragm.
This is because the outer edge portion of the diaphragm is fixed to another component when
being incorporated into a musical instrument or the like, and therefore can not be the target of
the determination method according to the present invention.
[0016]
The sample sound is a sound which the piezoelectric speaker generates continuously from the
diaphragm for the predetermined time.
Here, the predetermined time is preferably 1 second or more and 5 minutes or less.
If the predetermined time is shorter than one second, the integration time of the feature data is
short, and it may be difficult to determine the presence or absence of the feature peak. On the
other hand, if the predetermined time is longer than 5 minutes, the time taken for the
determination is too redundant.
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[0017]
It is preferable that the number which acquires the characteristic data acquired by this invention
is acquired in 3 to 9 places in the surface of a diaphragm. If the number is less than three,
uniform measurement in the plane can not be performed. On the other hand, if the number is
more than nine, the time taken for the determination is too redundant. Further, since
measurement of feature data needs to be performed as evenly as possible in the plane of the
diaphragm, the measurement position is set to surround the center of gravity of the diaphragm. If
there are more than three measurement positions, one of the measurement positions may be
matched with the position corresponding to the center of gravity of the diaphragm. It is desirable
that the number of measurement positions be five to nine in order to make the determination
more accurately and without bias.
[0018]
The feature peak indicates a resonance sound that appears at a specific frequency when the
diaphragm is vibrated by the piezoelectric speaker to generate a sample sound. The characteristic
peak indicates a vibration intensity that is stronger than a sound having a frequency before and
after the specific frequency when the vibration intensity with respect to the frequency of the
sample sound is measured and represented in a graph, and the peak at the specific frequency
Appears as a shape.
[0019]
In the present invention, that a feature peak appears at a common frequency position means that
when a plurality of feature peaks appear in one feature data, the feature peaks are also obtained
at all other feature data acquired at each frequency position at which the feature peak appears.
Say that appears.
[0020]
In addition, in order to form an acoustic diaphragm from a flat plate-shaped original, the position
which grinds the outer surface of a flat plate-shaped original plate, and the amount to cut off
differ for every flat plate-shaped original plate.
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The formed diaphragm is measured by the method according to the present invention, and in
each of the acquired feature data, when the diaphragm is determined to be an acoustic
diaphragm because a characteristic peak appears at a common frequency position, the acoustic
wave The thickness of the diaphragm is not necessarily equal in the plane, and the surface of the
acoustic diaphragm may be shaped to be gently corrugated.
[0021]
According to the present invention, it can be determined that the diaphragm to be determined is
an acoustic diaphragm that achieves an even vibration state in the plane.
[0022]
Further, according to the manufacturing method of the present invention, it is possible to
manufacture an acoustic diaphragm which realizes an even vibration state in the plane.
[0023]
The schematic diagram (i) seen from the cross-sectional direction of the diaphragm 3 and the
schematic diagram seen from the planar direction of the diaphragm 3 (ii ).
It is a block diagram explaining the composition of judgment device 1 used in order to carry out
the judgment method of the acoustic diaphragm concerning the present invention.
While showing the diaphragm 3 from a plane direction, it is a figure which shows position Pa-Pi.
It is a graph which shows the feature data 16a-16c in position Pa-Pc. It is a graph which shows
the feature data 16d-16f in position Pd-Pf. It is a graph which shows the feature data 16g-16i in
position Pg-Pi. FIG. 2 is a schematic view of the determination device 100 as seen from the crosssectional direction of a flat plate-shaped original plate 2; While showing the flat plate-like
original plate 2 from a plane direction, it is a figure which shows position Qa-Qi. It is a graph
which shows the characteristic data 17a-17c in position Qa-Qc. It is a graph which shows the
feature data 17d-17f in position Qd-Qf. It is a graph which shows the feature data 17g-17i in
position Qg-Qi.
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[0024]
Hereinafter, embodiments according to the present invention will be described in detail with
reference to the drawings.
[0025]
FIGS. 1 (i) and 1 (ii) are schematic views showing a determination apparatus 1 used to implement
the method for determining an acoustic diaphragm according to the present invention.
[0026]
The diaphragm 3 is formed by scraping the outer surface of a flat plate-like original plate 2
having a diameter of 25 cm and a thickness of 3.5 mm and made of natural wood and having a
round and flat plate shape.
In the determination device 1 shown in FIG. 1I, the piezoelectric speaker 4 is installed at the
surface center position Pa of the diaphragm 3 placed on the floor surface.
The piezoelectric speaker 4 is installed in a state where the vibrating body 5 is in contact with
the surface of the diaphragm 3, and the piezoelectric speaker 4 is connected to the player 6. The
contact portion of the vibrating body 5 with respect to the vibrating plate 3 has a circular shape
with a diameter of 20 mm, and the center of the vibrating body 5 is aligned with the position Pa.
The centers of the vibrators 5 coincide with the respective positions Pb to Pi in measurement at
other positions. Further, the outer edge portion of the diaphragm 3 is placed on a spacer G
installed on the floor surface. The position Pa coincides with the center of gravity of the
diaphragm 3 in plan view.
[0027]
The player 6 transmits an electrical signal to the piezoelectric speaker 4 continuously for a
predetermined time T based on the built-in sound source 7. The piezoelectric speaker 4 receives
the electric signal transmitted from the player 6 and vibrates the vibrating body 5 together with
the piezoelectric element (not shown) to generate the sample sound 8 continuously from the
diaphragm 3 for the predetermined time T. It can be done.
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[0028]
On the other hand, the sound collecting microphone 9 is installed immediately above the
piezoelectric speaker 4 at a position separated by a distance D. The sound collecting microphone
9 is a personal computer (hereinafter referred to as a PC 10) which is an information processing
unit. Can be received and converted into sound information 11 which is an electric signal and
transmitted to the PC 10.
[0029]
As shown in FIG. 2, the PC 10 includes an arithmetic unit 12, a memory 13, a display screen 14,
and an information processing program 15. The information processing program 15 integrates
the vibration intensity with respect to the frequency of the sound information 11 captured by the
sound collection microphone 9 continuously for a predetermined time T for each frequency.
Further, the calculation unit 12 displays the result obtained by the information processing
program 15 on the display screen 14 as a graph of vibration intensity with respect to the
frequency.
[0030]
Based on the above determination apparatus 1, the determination method of the acoustic
diaphragm according to the present invention will be described. First, as shown in FIG. 3, the
piezoelectric speaker 4 was installed at the surface center position Pa of the diaphragm 3. Next,
the sound collecting microphone 9 was installed at a distance D in the piezoelectric speaker 4.
Here, the distance D was 3 cm. Then, the sound source 7 built in the player 6 is generated from
the diaphragm 3 with a sample sound 8 having a plurality of frequencies continuously sent to the
piezoelectric speaker 4 for a predetermined time T, and the sample sound 8 is collected. Capture
with the microphone 9. Here, the sound source 7 adopts J.S.Bach's Sonata for Flute and
Harpsicode In A 1 (BWV 1032) Vivance Aure Nicolet. The predetermined time T is 30 seconds. In
addition, it is assumed that the strength of amplification of the electrical signal based on the
sound source 7 in the player 6 is constant even when acquiring feature data at each position Pb
to Pi described below.
[0031]
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The sample sound 8 taken in by the sound collection microphone 9 is converted into sound
information 11 and transmitted to the PC 10. The PC 10 temporarily stores the transmitted
sound information 11 in the memory 13, and continues the vibration intensity with respect to
the frequency of the sound information 11 by the information processing program 15 for the
predetermined time T for each frequency. Feature data 16a obtained by integration is acquired.
The display screen 14 displays a graph composed of the obtained feature data 16 a.
[0032]
Next, the piezoelectric speaker 4 is placed at a position Pb at the center of the surface of the
diaphragm 3 and the sound collecting microphone 9 is placed directly above the piezoelectric
speaker 4 at a distance away from the distance D. The feature data 16b is acquired in the same
manner as the feature data 16a. Furthermore, similarly, when the installation positions of the
piezoelectric speaker 4 and the sound collection microphone 9 are respectively set as positions
Pc to Pi at the surface central portion of the diaphragm 3 as shown in FIG. I got Here, the surface
center portion is a portion inside the outer edge portion where the diaphragm 3 is in contact
with the spacer G.
[0033]
The graph which shows to the acquired characteristic data 16a-16i was enumerated to FIGS. 4-6
as 0-120 dB and a horizontal axis are 0-20 kHz for a vertical axis | shaft.
[0034]
According to FIGS. 4 to 6, the diaphragm 3 exhibits a feature peak (1) at a frequency of 4.4 kHz,
a feature peak (2) at 8.0 kHz, and a feature peak (3) at 11.1 kHz.
Table 1 also shows whether or not feature peaks (1) to (3) can be recognized in each of the
feature data 16a to 16i acquired at the positions Pa to Pi. According to FIGS. 4 to 6 and Table 1,
since the feature peaks (1) to (3) can be confirmed at any of the positions Pa to Pi, the respective
feature data 17a to 17a at all the measurement positions Pa to Pi Since it can be said that the
feature peak appeared at the frequency position common to 17i, it could be determined that the
diaphragm 3 is an acoustic diaphragm that realizes an even vibration state in the plane.
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[0035]
And by the said determination process, manufacture of the acoustic diaphragm which implement
| achieves a uniform vibration state in surface was able to be performed.
[0036]
[0037]
In addition, as a comparative example, the characteristic data is acquired similarly to the case of
the determination device 1 using the determination device 100 which is the flat plate-like
original plate 2 in a state before the diaphragm 3 of the determination device 1 cuts the surface.
It was determined using the determination method according to the present invention whether or
not the original plate 2 is an acoustic diaphragm that achieves an in-plane uniform vibration
state.
FIG. 7 is a view showing the positional relationship between the flat plate-like original plate 2, the
piezoelectric speaker 4 installed at the position Qa, and the sound collecting microphone 9 in the
case of the determination device 100.
In the determination apparatus 100, the piezoelectric speaker 4 is installed at the surface center
position Qa of the diaphragm 3 mounted on the floor surface. The piezoelectric speaker 4 is
installed in a state where the vibrating body 5 is in contact with the surface of the diaphragm 3,
and the piezoelectric speaker 4 is connected to the player 6. The contact portion of the vibrating
body 5 with respect to the vibrating plate 3 is a circular shape having a diameter of 20 mm, and
the center of the vibrating body 5 is aligned with the position Qa. The centers of the vibrators 5
coincide with the respective positions Qb to Qi in measurement at other positions. Further, as in
the case of the diaphragm 3 in the determination apparatus 1, the outer edge portion of the flat
plate-shaped original plate 2 is placed on the spacer G installed on the floor surface. The position
Qa coincides with the center of gravity of the flat plate 2 in plan view. In the determination
apparatus 100, the other components corresponding to the determination apparatus 1 such as
the player 6 and the PC 10 have the same configuration as the determination apparatus 1.
[0038]
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First, the piezoelectric speaker 4 was installed at a position Qa in the central portion of the
surface of the flat plate 2 shown in FIG. 8, and the sound collecting microphone 9 was installed at
a distance D directly above the piezoelectric speaker 4. Here, the distance D was 3 cm, which was
the same as the distance D in the measurement using the determination apparatus 1. Then, the
sound source 7 built in the player 6 is generated from the diaphragm 3 with a sample sound 8
having a plurality of frequencies continuously sent to the piezoelectric speaker 4 for a
predetermined time T, and the sample sound 8 is collected. Capture with the microphone 9. Here,
the sound source 7 adopts J.S.Bach's Sonata for Flute and Harpsicode In A 1 (BWV 1032)
Vivance Aure Nicolet. Here, the predetermined time T is 30 seconds, which is the same as the
predetermined time T in the case of measurement using the determination apparatus 1. Note that
the strength of amplification of the electric signal based on the sound source 7 in the player 6 is
constant even when acquiring feature data at each of the following positions Qb to Qi, and the
positions Pa to Pi using the determination device 1 The same as the amplification intensity when
acquiring feature data at each position of.
[0039]
The sample sound 8 taken in by the sound collection microphone 9 is converted into sound
information 11 and transmitted to the PC 10. The PC 10 temporarily stores the transmitted
sound information 11 in the memory 13, and continues the vibration intensity with respect to
the frequency of the sound information 11 by the information processing program 15 for the
predetermined time T for each frequency. Feature data 17a obtained by integration is acquired.
The display screen 14 displays a graph including the obtained feature data 17a.
[0040]
Next, the piezoelectric speaker 4 is placed at a position Qb at the center of the surface of the
diaphragm 3 and the sound collecting microphone 9 is placed directly above the piezoelectric
speaker 4 at the distance D, and then the sample sound 8 is used. The feature data 17b is
obtained in the same manner as the feature data 17a. Furthermore, similarly, when the
installation positions of the piezoelectric speaker 4 and the sound collecting microphone 9 are
respectively set as the positions Qc to Qi at the surface central portion of the diaphragm 3 as
shown in FIG. I got Here, the surface center portion is a portion inside the outer edge portion
where the diaphragm 3 is in contact with the spacer G.
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[0041]
9-11, the acquired feature data 17a-17i are listed with the vertical axis as 0 to 120 dB and the
horizontal axis as 0 to 20 kHz.
[0042]
According to FIGS. 9 to 11, according to the flat plate plate 2, at the positions Qb, Qc and Qh, the
characteristic peak (4) at a frequency of 4.5 kHz and the characteristic peak at a frequency of 8.0
kHz and the characteristic peak at a frequency of 11.0 kHz. (6) is shown.
However, when the presence or absence of the feature peak in the plane of the plate-like original
plate 2 is examined, none of the feature peaks (4) to (6) are shown at the positions Qa, Qd, Qe,
Qf, Qg and Qi. The Further, Table 2 shows a list of whether or not the feature peaks (4) to (6) can
be recognized in each of the feature data 17a to 17i acquired at the positions Qa to Qi. According
to FIGS. 9 to 11 and Table 2, it can not be said that the feature peak appears at the frequency
position common to each of the feature data 17a to 17i at the measurement positions Qa to Qi of
all the feature peaks. Therefore, it can not be said that the flat plate-like original plate 2 is an
acoustic diaphragm which realizes a uniform vibration state in the plane.
[0043]
[0044]
The present invention can determine whether an acoustic diaphragm used for a resonance plate
of a musical instrument or an enclosure of an audio device achieves a uniform vibration state in a
plane.
[0045]
DESCRIPTION OF SYMBOLS 1 Judgment device 2 Flat plate original plate 3 diaphragm 4
piezoelectric speaker 5 vibrator 6 player 7 sound source 8 sample sound 9 sound collection
microphone 10 PC 11 sound information 14 display screen 15 information processing program
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