JP2006165717

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DESCRIPTION JP2006165717
PROBLEM TO BE SOLVED: To provide a method for lowering the initial frequency of a planar
piezoelectric speaker actuator by improving low frequency response and flattening the entire
frequency response curve to obtain a good sound reproduction effect of low frequency sound.
SOLUTION: A piezoelectric thin film is provided respectively on the upper and lower sides of a
metal thin film including a central portion and a wing portion, a frame is installed on one surface
on the central portion, and a conductive wire connected by a metallic conductive wire is fixed.
The thin film has metal electrodes (positive) and metal electrodes (negative) respectively
disposed on the top and bottom of the piezoelectric thin film, and the side parts of the central
part are extended left and right to provide symmetrical wing parts. R1> 1 when R1; R2> 1 when
total wing length ÷ Ring length = R2; wing length ÷ center width = R3; R3> 1; R1 = R2 = R3 = 1
When .618, the degree of reduction of the initial frequency and the flatness of the frequency
response curve reach the best state, and when the total length = 4.236 median width, the degree
of reduction of the initial frequency and frequency response curve Reaches the most ideal
condition. [Selected figure] Figure 2
Method of reducing the initial frequency of a planar piezoelectric speaker actuator
[0001]
The present invention relates to a planar piezoelectric speaker actuator, and more particularly, to
a method of lowering the initial frequency of a planar piezoelectric speaker actuator, comprising
symmetrical wing portions provided by extending side portions of the central portion to the left
and right. The length of the wing plus the center, the entire width is the width of the wing, the
wing is the length of the wing, the width of the center is the width of the center, and the overall
length ---- = R1 When and R1> 1; Overall width Overall width -------- == R2 and R2> 1; Wing
length Wing length ------ == R3, And R3> 1; central width R1 = R2 = R3 = 1.618, the degree of
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reduction of the initial frequency and the flatness of the frequency response curve reach the best
condition, total length = 4.236 central width When the degree of reduction of the initial
frequency and the flatness of the frequency response curve The invention relates to a method for
reducing the initial frequency of a planar piezoelectric speaker actuator, characterized in that the
degree reaches the most ideal state.
[0002]
As shown in FIG. 9, when a general planar piezoelectric speaker actuator has an initial frequency
of about 400 Hz or more at the time of use, and the undulation of the entire frequency response
curve is large, it produces sound, for example, For low-frequency sound sources such as males
speaking, voices with low voice frequencies may not be able to be emitted or the quality of the
voices produced may be poor, and it is also good when the frequency variation range is large Not
easy to generate frequency characteristics.
[0003]
Also, in the prior art, when the initial frequency and the overall length are inversely proportional,
and the overall length is not changed, it is effective when combined with one equipped with a
small-sized audio reproduction device such as a cellular phone. Since the initial frequency can
not be suppressed and the frequency response curve is very rough, the sound reproduction effect
is deteriorated.
[0004]
Therefore, how to effectively improve the low frequency frequency characteristics is a technical
problem solved by the present invention.
[0005]
The object of the present invention is to reduce the initial frequency of a planar piezoelectric
speaker actuator by improving the low frequency response and flattening the overall frequency
response curve to obtain a good sound reproduction effect of low frequency sound. It is to
provide.
[0006]
The flat piezoelectric speaker actuator according to the present invention includes a central
portion and a wing portion, respectively provided with piezoelectric thin films on the upper and
lower sides of a metal thin film, a frame on one surface on the central portion, and fixing a lead
connected by a metal lead Among them, the piezoelectric thin film comprises metal electrodes
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(positive) and metal electrodes (negative) respectively disposed above and below the piezoelectric
thin film, and side portions of the central portion are extended laterally to provide symmetrical
wing portions. The total length is the sum of the left and right wing parts and the central part,
the entire width is the width of the wing parts, the wing length is the length of the wing parts, the
central width is the width of the central part, and the total length --- -= When R1 and R1> 1;
Overall width Overall width --------- = When R2 and R2> 1; Wing length Wing length ------- -When
= R3 and R3> 1; central width R1 = R2 = R3 = 1.618 When the degree of reduction of the initial
frequency and the flatness of the frequency response curve reach the best state and the total
length = 4.236 central width, the degree of reduction of the initial frequency and the flatness of
the frequency response curve are most It is characterized by reaching an ideal state.
[0007]
In order to clarify the inventive step and the practicality of the present invention, the practical
effects of the present invention will be shown below.
1. Low frequency response can be improved.
2. Low frequency voices can also produce good voice reproduction effects.
3. Flatten the overall frequency response curve, and reduce the loss of reality during audio
playback.
4 、 Can be higher voice frequency angle tolerance.
5, highly inventive and practical.
6. Improve industrial competitiveness.
[0008]
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The planar piezoelectric speaker actuator A according to the present invention, as shown in FIGS.
1, 2 and 3, includes a central portion A6 and a wing portion A7, and a piezoelectric thin film A1
is attached to the top and bottom of the metal thin film A2, respectively. The frame A3 is
provided on one side, and the lead A4 connected by the metal lead A5 is fixed. Further, the
piezoelectric thin film A1 is formed by arranging a metal electrode (positive) A11 and a metal
electrode (negative) A12 on the upper and lower sides of the piezoelectric thin film A13.
[0009]
The side portions of the central portion A6 are extended to the left and right to provide
symmetrical wing portions A7. As shown in FIG. 4, the total length B1 is the width from end to
end of the left and right wing parts A7, the wing length B3 is the length of the wing parts A7, and
the central width B4 is the width of the central part A6. As can be seen from the following
formula, when the overall length ---- = R1 and R1> 1; the overall width the overall width ------- =
R2 and R2> 1 Wing length----------------=-= = R3 and R3> 1; Center width R1 = R2 = R3 = 1.618, the
degree of reduction of its initial frequency and frequency response curve Is characterized in that
the degree of initial frequency reduction and the degree of flatness of the frequency response
curve reach the most ideal state when the total length = 4.236 median width B4. .
[0010]
If the wing portion A7 is increased without changing the overall length and thickness of the
planar piezoelectric speaker actuator A, the start point of the initial frequency decreases and at
the same time the frequency response curve approaches flat.
[0011]
FIG. 8 shows a waveform diagram of the frequency-corresponding dB value of the planar
piezoelectric speaker actuator A of the present invention.
As shown, resonance can already be generated at 250 Hz, and a good frequency response can be
obtained for low audio frequencies. In addition, the curve at resonance shown in the figure is flat,
the distance between the high and low peaks of the resonance response waveform diagram is
close, and the response variation rate is low even when the variation of the audio frequency is
large, stable good frequency characteristics You can keep it.
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[0012]
The planar piezoelectric speaker actuator A of the present invention, as shown in FIGS. 5 and 5-1,
after the signal is sent to the planar piezoelectric speaker actuator A, the resonant resonant wave
generated by the piezoelectric thin film A1 and the metal thin film A2 It passes through the
frame A3 and is transmitted to the corn paper C or flat plate D to emit sound. Among them, the
flat plate D is a flat plate such as a wood plate, a metal plate, an acrylic plate, a rubber plate, and
a paper plate.
[0013]
As shown in FIGS. 6 and 6A, the flat piezoelectric speaker actuator E can have the piezoelectric
thin film E2 on the metal thin film E1 as the piezoelectric thin film E2 of three, five or more
layers. And have the same functions as described above. The piezoelectric thin film E2 on the
metal thin film E1 can be provided only on one side, and has the same function as described
above.
[0014]
As shown in FIG. 7, in the planar piezoelectric speaker actuators F and G of the present invention,
the ratio of the wing portions F2 and G2 is larger than the ratio of the central portions F1 and
G1, and a plurality of ladders, rectangles, circles, triangles, etc. And, it is possible to provide
wings F2 and G2 symmetrical with respect to the center F1 and G1, and similarly to lower the
initial frequency and flatten the frequency response curve.
[0015]
As mentioned above, since the present invention satisfies the requirements of the patent
application, the patent application is filed here under the Patent Act.
[0016]
It is a three-dimensional perspective view of the present invention.
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It is a three-dimensional exploded view of the present invention.
It is a sectional view of the present invention. It is a top view of the present invention. It is a
three-dimensional perspective view which shows Example 1 of this invention. It is the threedimensional perspective view and the elements on larger scale which show Example 1 of this
invention. It is the side view and the elements on larger scale which show Example 2 of this
invention. In Example 2 of this invention, it is the side view and the elements on larger scale
which show the state which installed the piezoelectric thin film only on the single side ¦ surface
of a metal thin film. It is a top view which shows Example 3 of this invention. It is a test
waveform figure of the present invention. It is a test waveform diagram of a prior art.
Explanation of sign
[0017]
A Planar Piezoelectric Speaker Actuator A1 Piezoelectric Thin Film A11 Metal Electrode (Positive)
A12 Metal Electrode (Negative) A2 Metal Thin Film A3 Frame A4 Conductor A5 Metal Conductor
A6 Central Part A7 Wing Part B1 Total Length B2 Overall Width B3 Wing Length B4 Central
Width C Cone Paper D Flat plate E, F, G Flat piezoelectric speaker actuator E1 Metal thin film E2,
E3 Piezoelectric thin film F1, G1 Central part F2, G2 Wing part
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