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JPH02179200

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DESCRIPTION JPH02179200
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sounding device using a ferroelectric liquid crystal. 2. Description of the Related Art
Conventionally, flat-type sounding devices widely used in various devices such as watches and
calculators are piezoelectric devices such as a piezoelectric buzzer and a piezoelectric speaker.
[Problems to be Solved] The above-mentioned conventional piezoelectric sounding device is
suitable for outputting music or synthetic speech since the response frequency band is narrow
and sufficient sound pressure can not be obtained particularly in the low frequency range. It also
has the disadvantage that the sound quality is hard. Therefore, an object of the present invention
is to provide a sound generation device which is flat, has a wide response frequency band, can
obtain sufficient sound pressure even in a low frequency range, and can be sufficiently used as
an output of synthetic speech. is there. [Means for Solving the Three Problems] The feature of the
sound generation device using the ferroelectric liquid crystal according to the present invention
is that the drive electrode is formed on the opposing surface of a pair of substrates sealing the
ferroelectric liquid crystal. At least one of the drive electrodes is a plurality of divided electrodes.
Another feature of the present invention is that each divided electrode is formed to be divided
into different areas. Another feature of the present invention is that a partition wall is provided
between the substrates for each divided electrode. Yet another feature of the present invention is
that the split electrodes are formed symmetrically with respect to the center. Another feature of
the present invention is that drive signals for different frequency bands are supplied to each
divided electrode. Yet another feature of the present invention is that the same signal is
selectively supplied to each divided electrode. Yet another feature of the present invention is that
drive signals for different frequency bands are selectively supplied to the divided electrodes at 0
(supplied). [Operation] Since the drive electrodes are divided electrodes, it is possible to select the
number and position of the electrodes for supplying the drive signal, and it is possible to change
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the frequency band of the drive signal supplied to each divided electrode. When the same signal
is supplied, the volume changes by selecting the number and positions of the split electrodes.
Further, when driving signals of different frequency bands are supplied to each divided electrode,
the tone range of sound generation changes. If drive signals in different frequency bands are
selectively supplied to the split electrodes, the range and volume change. For example, in the
case of sounds in a range that is hard to come out, the split electrodes of the location, size and
number of easy to pronounce are selected Be The partition wall also enhances the independence
of each divided electrode. Embodiments of the present invention will be described with reference
to the drawings. As shown in FIG. 1, a pair of substrates 1.2A are squeezed for a predetermined
time; and the ferroelectric liquid crystal 3 is sealed by the sealing material 4 in the gap.
Drive electrodes are formed on the opposing surfaces of the substrates 1 and 2A. The drive
electrode 11 formed on the substrate 1 is a full surface electrode, and is pulled out to the outside
by the lead electrode 11a. Further, on the substrate 2A, divided electrodes 21 22 23 divided into
three are formed at positions facing the drive electrodes 11, and they are lead electrodes 21a. It
is pulled out by 22a and 23a. Divided electrode 21. 2 2. Reference numeral 23 denotes
large, medium, and small areas having different areas. FIG. 2 is a block diagram of the drive
means of such a sound generation device, in which drive signals for different frequency bands
are supplied to the divided electrodes 21 and 22 and 23 between the drive electrodes 11 and 12.
The substrate 1.2A vibrates and emits a sound due to the electrostrictive effect of the
ferroelectric liquid crystal 3 which generates an electric field and seals the gap. That is, the
human power signal P is a low pass filter 5. A drive signal of a low frequency band is supplied to
the divided electrodes 21 through the amplifier 6, and the sound of the bass region is emitted by
the large divided electrodes 21. Further, the human power signal P supplies a drive signal of the
middle frequency band to the divided electrodes 22 through the middle pass filter 7 and the
amplifier 8, and sounds in the middle range are emitted by the divided electrodes 22 of the
intermediate size. Also, the input signal P is a high pass filter 9. A drive signal of a high frequency
band is supplied to the divided electrode 23 through the amplifier 10, and the sound of the high
range is emitted by the small divided electrode 23. As described above, since the sound in the
high range is relatively easy to output, a sufficient sound pressure can be obtained with the small
split electrode 23, but the sound in the low range is hard to be emitted. The frequency sound
pressure characteristics are made uniform by this. In the third embodiment, the divided
electrodes 31 and 32 having different areas as described above are formed on one of the
substrates 2B, and between the group II <2B and the substrate opposed thereto. A partition wall
3535 is provided for each divided electrode, and is connected to the sealing material 34 on the
outer periphery. The ferroelectric liquid crystals are respectively sealed in the divided gaps. In
such a sound producing apparatus, since the vibration area is divided for each divided electrode,
the independent driveability is enhanced. In the sound generation device of the fourth
illustration, divided electrodes 41.42.43 of different areas similar to the above are formed on one
substrate 2C, but these divided electrodes 41 to 43 are formed symmetrically with respect to the
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center It is That is, a divided electrode 41 with a large circular area is formed at the center, a
ring-shaped divided electrode 42 concentric with the outer periphery, and a ring-shaped divided
electrode 43 concentric with the outer periphery.
FIG. 5 is a block diagram of the driving means of the sound producing apparatus as shown in FIG.
4. The same signal is selectively supplied to each of the divided electrodes 41 and 42 °. That is,
the manual signal P is supplied via the switch 44, and the switch 44 is a changeover switch
capable of switching between the small volume terminal 44a, the middle volume terminal 44b,
and the large volume m terminal 44c. When switched to the terminal 44a, the supplied signal P
is transmitted to the amplifier 45. The signal P is supplied to the divided electrode 41 through
the OR gate 46 to produce a small volume of sound, and when switched to the terminal 44b, the
supplied signal P is supplied to the amplifier 47. The split electrodes 41 and 42 are supplied to
the split electrodes 41 and 42 through the OR gates 46 and 48, and are produced at medium
volume by the two electrodes. Further, when switched to the terminal 44c, the supplied signal P
is supplied to the divided electrode 43 through the amplifier 49 and to the divided electrodes 41
and 42 through the OR gates 46 and 48, The loud sound is produced by the split electrodes. In
the case of such a circular electrode, since the center portion of the circle is likely to emit sound,
the connection between the divided electrodes 41 and 43 is performed so that the small volume
terminal 44a supplies a signal to the divided electrodes 43 on the outer peripheral portion. If you
change the position, the difference in volume becomes even more humane. In the sound
generation device of the sixth illustration, divided electrodes 51 and 52.53 having different areas
similar to the above are formed symmetrically with respect to the center on one substrate 2D.
That is, divided electrodes 51 with a large area in the center, symmetrical divided electrodes
52.52 on both sides thereof, and symmetrical divided electrodes 53.53 on both sides thereof are
formed. FIG. 7 is a block diagram of the driving means of the sound producing apparatus as
shown in FIG. 6. Driving signals for different frequency bands are selectively supplied to the
divided electrodes 51 and 52.53. That is, when the high-pitched sound is emitted, the input
signal P is a high pass filter 54 ° amplifier 55. A drive signal of a high frequency band is
supplied to the divided electrode 53 through the OR gate 56, and the outermost two divided
electrodes 53.53 generate a sound. Further, when the midrange sound is emitted, the human
power signal P is a midpass filter 57. アンプ58. The medium frequency band drive signal is
supplied to the split electrodes 53 and 52 through the OR gates 56 and 59, and the outer and
middle four split electrodes 53.52 generate sounds. Also, in the case of emitting sounds in the
low range, the manual signal P is a low pass filter 60. A drive signal of a low frequency band is
supplied to the divided electrode 51 through the amplifier 61, and a drive signal of the low
frequency band is supplied to the divided electrodes 53 and 52 through the OR gates 56 and 59.
, 52.53.
Sound in the high range is relatively easy to use, so sufficient sound pressure can be obtained
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with the outermost split electrode 53, but sound in the low range is hard to come out, so
sufficient sound pressure is obtained with all split electrodes 51.5253 This makes the frequency
sound pressure characteristics uniform. Further, as shown in FIG. 8, by providing the four
portions 64 on the substrate 1 or the substrate 2E, the independence of each of the divided
electrodes 61.62.63 facing the drive electrode 65 can be further enhanced. As shown in the ninth
example, the thickness of the substrate 1 or the substrate 2F can be changed for each of the
divided electrodes 71.72.73 facing the drive electrode 75 to make the difference in each sound
range remarkable. Although the above-described embodiment is an example in which one of the
opposing drive electrodes is formed as a split electrode, the present invention is not limited to
this. For example, rectangular split electrodes in which both drive electrodes extend in a direction
orthogonal to each other The same function as above can be achieved by forming a matrix
electrode, supplying a high frequency band signal to the 1M electrodes in the outer peripheral
portion, and supplying a low frequency band signal to the central 1 An effect is obtained. [Effect]
or more-! Since the sound generation device using the ferroelectric liquid crystal of the present
invention configured as described above is flat, it can be used without requiring a large space for
various devices such as a clock and a calculator, and the response frequency band is Since the
frequency sound pressure characteristics are wide and uniform, sufficient sound pressure is 1 ′
′: j even in the low-pitch range, and can be used sufficiently for output of synthetic speech.
Moreover, since the volume can be changed without using a variable volume, the configuration
can be simplified.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a partially cutaway front view showing one embodiment of the present invention, FIG. 2
is a block diagram showing one example of its driving means, and FIG. 3 is a sectional view
showing another embodiment of the present invention. The figure is a front view showing still
another example of the divided electrode, FIG. 5 is a schematic diagram showing an example of
the driving means, and FIG. 6 is a sectional view showing still another embodiment of the present
invention, FIG. FIG. 8 is a cross-sectional view showing still another embodiment of the present
invention, and FIG. 9 is a side cross-sectional view showing still another embodiment of the
present invention. .
1.2A, 2B, 2C, 2D, 2E, 2F, substrate, 3 ···· 11 ··· 21, 242, 463, 735 # ferroelectric liquid crystal,
drive electrode, 2.23, 31. . 32.33, 41.degree. 3.51, 52, 53. 61. 62.degree. 1.7. 73 .. Drive
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electrode (divided electrodes), partition wall.
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