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DESCRIPTION JP2003047094

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DESCRIPTION JP2003047094
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
various types of battery-powered devices and instruments, and more particularly to
improvements in devices and instruments suitable for low driving voltages.
[0002]
BACKGROUND OF THE INVENTION Piezoelectric driving bodies are widely used as simple
electroacoustic transducers and actuators. In particular, applications to mobile phones and
portable information terminals are expected recently. The piezoelectric drive basically has a
unimorph structure as shown in FIG. 7A in cross section and a bimorph structure as in FIG. 7B in
cross section. First, the piezoelectric driving body having a unimorph structure has a
configuration in which the piezoelectric element 900 is bonded to the shim plate 910. The
piezoelectric element 900 comprises an electrode 904 on the surface of a piezoelectric layer 902
made of piezoelectric ceramics {ceramics containing lead zirconate titanate (abbreviated as PZT),
barium titanate, lead zirconate, lead titanate, etc. as main components}, etc. It has a laminated
structure in which 906 is formed. A predetermined polarization is applied to the piezoelectric
layer 902 by applying a voltage using the electrodes 904 and 906. On the other hand, the shim
plate 910 is made of metal or the like. The piezoelectric element 900 is bonded to the shim plate
910 by an adhesive, for example.
[0003]
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In other words, a drive signal is applied between the electrode 904 and the electrode 906 (or the
shim plate 910) of the piezoelectric element 900 thus obtained. The shim plate 910 side is
usually a common terminal. Then, the piezoelectric element 900 expands and contracts in the
direction indicated by the arrow FA. However, because the shim plate 910 is present, the whole
becomes curved, and as a result, it is driven in the direction indicated by the arrow FB.
[0004]
On the other hand, the piezoelectric driving body having a bimorph structure shown in FIG. 7B
has a structure in which a piezoelectric element 920 is provided on the back surface side of the
shim plate 910 in FIG. 7A. The piezoelectric element 920 has a laminated structure in which
electrodes 924 and 926 are formed on the surface of the piezoelectric layer 922. Voltage is
applied to the piezoelectric layer 922 using the electrodes 924 and 926 to perform
predetermined polarization. The electrode 926 is at the same potential as the electrode 906, and
is generally grounded.
[0005]
In the case of this bimorph structure, since the polarization directions of the piezoelectric layers
902 and 922 are opposite to each other in the piezoelectric element 900 and the piezoelectric
element 920, the expansion and contraction shown by arrows FA and FC are opposite to each
other. That is, when the piezoelectric element 900 extends in the arrow FA direction, the
piezoelectric element 920 contracts in the arrow FC direction, and conversely, when the
piezoelectric element 900 contracts in the arrow FA direction, the piezoelectric element 920
expands in the arrow FC direction. That is, when one surface of the shim plate 910 is contracted,
the other surface is in an extended relationship, and as a whole, it is driven in the arrow FB
direction.
[0006]
By the way, since the power supply is a battery for various portable devices and instruments, the
driving voltage is not necessarily high. Therefore, even if a sound generator is provided, it is
more convenient as the drive voltage is lower. Further, from the viewpoint of portable type, it is
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preferable that the sounding body be thin. On the contrary, the sounding body satisfying such
conditions can be attached to various devices, and can be used in various ways.
[0007]
The present invention focuses on the above points, and an object of the present invention is to
provide various battery-powered devices / apparatus to which a novel function using a sound
generator is added.
[0008]
SUMMARY OF THE INVENTION In order to achieve the above object, according to the present
invention, a piezoelectric speaker using a piezoelectric element in which a plurality of
piezoelectric layers and electrode layers are alternately laminated; sound output from the
piezoelectric speaker Audio signal generating means for generating signal data of
The above and other objects, features and advantages of the present invention will be apparent
from the following detailed description and the accompanying drawings.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION <First Embodiment> First, a first embodiment
of the present invention will be described with reference to FIGS. 1 and 2. FIG. In this
embodiment, as shown in FIGS. 1 (A) to (B), the present invention is applied to a wristwatch. The
example shown in FIG. 6A is configured such that the piezoelectric speaker 102 housed in the
watch 100 can be drawn out and used, and the example shown in FIG. Is provided.
[0010]
The piezoelectric speaker 102 uses a piezoelectric driving body having a laminated structure as
shown in FIG. First, FIG. 6A shows an example of a unimorph structure, in which the piezoelectric
element 10 is bonded to the shim plate 20. The piezoelectric element 10 has a structure in which
piezoelectric layers 12A to 12C made of PZT or the like and electrode layers 14A to 14D are
alternately stacked. The piezoelectric layers 12A to 12C and the electrode layers 14A to 14D are
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entirely baked simultaneously after lamination of a predetermined number, and then adhered to
the approximate center of the shim plate 20 by an adhesive.
[0011]
Further, a voltage for polarization is applied to the piezoelectric layers 12A to 12C by using the
electrode layers 14A to 14D, and predetermined polarization is performed. The polarization is
applied in directions opposite to each other between adjacent piezoelectric layers. For example,
assuming that the piezoelectric layer 12A and the piezoelectric layer 12C are polarized in the
arrow F1 direction, the piezoelectric layer 12B is polarized in the arrow F2 direction opposite to
the arrow F1. For example, when a voltage is applied such that the electrode layers 14A and 14C
are negative and the electrode layers 14B and 14D are positive, polarization is performed in the
directions of the arrow F1 and the arrow F2. On the other hand, the shim plate 20 is made of
metal or the like. The piezoelectric element 10 is bonded to the shim plate 20 by, for example, an
adhesive. The periphery of the shim plate 20 is fixed and supported by appropriate means.
[0012]
A drive voltage such as an audio signal is applied, for example, between the electrode layers 14B
and 14D and the electrode layers 14A and 14C. Then, since the voltage directions and the
polarization directions coincide with each other, the piezoelectric layers 12A to 12C
simultaneously expand and contract in the arrow FA direction. However, since the shim plate 20
is present, the whole becomes curved, and as a result, it is driven in the direction indicated by the
arrow FB. In this case, as compared with the background art described above, the thickness of
the piezoelectric layer is thinner in this embodiment and has a laminated structure, and
therefore, it can be driven with a low driving voltage.
[0013]
FIG. 2 (B) shows an example of a bimorph piezoelectric drive, in which the piezoelectric element
10 is provided on one side of the shim plate 20, and the piezoelectric element 30 is provided on
the other side. . The piezoelectric element 30 has a structure in which piezoelectric layers 32A to
32C and electrode layers 34A to 34D are alternately stacked, and is bonded to the shim plate 20
by an adhesive. The polarization direction of the piezoelectric layers 32A to 32C is opposite to
that of the piezoelectric layers 12A to 12C.
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[0014]
A drive voltage such as an audio signal is applied between the electrode layers 14B, 14D, 34B,
34D and the other electrode layers 14A, 14C, 34A, 34C. Therefore, the expansion and
contraction in the arrow FA direction of the piezoelectric element 10 and the expansion and
contraction in the arrow FC direction of the piezoelectric element 30 are opposite to each other.
That is, when the piezoelectric element 10 extends in the arrow FA direction, the piezoelectric
element 30 contracts in the arrow FC direction. Conversely, when the piezoelectric element 10 is
contracted in the arrow FA direction, the piezoelectric element 30 extends in the arrow FC
direction. For this reason, as a whole, it vibrates in the arrow FB direction.
[0015]
Next, referring back to FIG. 1, the drive device of the piezoelectric speaker 102 is shown in FIG.
As shown in the figure, an acceleration sensor 110 is provided inside the wristwatch 100, and
the detection output side is connected to the data acquisition unit 112. The data acquisition unit
112 is connected to a time measurement unit 114 which is an essential function as a timepiece.
The output side of the data acquisition unit 112 is connected to the speech synthesis unit 115,
and the synthesized speech output side of the speech synthesis unit 115 is connected to the
piezoelectric speaker 102. Power is supplied from the power supply 116 to the above-described
units. A known circuit such as an amplifier for signal amplification may be connected as
necessary (the same applies to the following embodiments).
[0016]
Next, the operation of the present embodiment will be described. When the user of the watch
100 needs an audio time signal, the watch 100 is strongly shaken. Then, this is detected by the
acceleration sensor 110, and the fact is notified to the data acquisition unit 112. At this time, the
data fetching unit 112 fetches time data from the clocking unit 114 and outputs the time data to
the voice synthesis unit 115. The voice synthesis unit 115 generates a voice signal
corresponding to the input time data, and supplies the voice signal to the piezoelectric speaker
102. Then, the sound of the current time is output from the piezoelectric speaker 102, for
example, in the "afternoon o'clock xxx minutes" state. This is convenient when the watch 100 is
hidden and can not be seen.
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[0017]
By the way, according to the present embodiment, a laminated piezoelectric element is used as
the piezoelectric speaker 102. Therefore, as described above, the drive voltage of the
piezoelectric speaker 102 may be low. Therefore, even if the drive voltage of the power supply
116 is low, it is possible to cope with it, and a booster circuit or the like is not required. In
addition, because of the laminated type, a large sound pressure can be obtained.
[0018]
The present embodiment can be applied to a calculator 120 as shown in FIG. 1 (D). The example
shown in the figure is of a type driven by a solar cell 122, and a piezoelectric speaker 124 is
provided on the operation / display panel side. When the user operates the key group 126 to
perform an appropriate calculation input and finally presses the equal key 128, the calculation
result is output from the piezoelectric speaker 124 as a voice.
[0019]
Embodiment 2 Next, Embodiment 2 will be described with reference to FIG. This example is an
embodiment for preventing lost articles and theft, and as shown in FIG. 6A, it comprises a
transmission card 200 and a reception card 210. The transmission card 200 is constituted by a
transmission unit 202 and an antenna 204 as shown in FIG. The reception card 210 is
configured by an antenna 212, a reception unit 214, a reception level detection unit 216, and a
piezoelectric speaker 218, as shown in FIG.
[0020]
The transmission card 200 is stored, for example, in a bag or a jacket of the user. On the other
hand, the reception card 210 is attached to an object which is intended to prevent lost articles or
theft, such as a wallet, a commuter pass, a card case such as a license or a credit card, a clock, a
mobile phone, or the like. The transmission card 200 outputs a constant signal from the
transmission unit 202, which is transmitted from the antenna 204. The radio wave is received by
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the antenna 212 and the receiving unit 214 of the receiving card 210. Then, the reception signal
level is detected by the reception level detection unit 216. As a result, when the reception level is
lower than a predetermined level, a detection signal to that effect is output to the piezoelectric
speaker 218, and the piezoelectric speaker 218 produces sound.
[0021]
The received signal level is generally considered to be inversely proportional to the distance
between the sending card 200 and the receiving card 210, depending on the situation. That is, as
the distance between both cards 200 and 210 increases, the received signal level decreases and
the piezoelectric speaker 218 sounds. Therefore, the user can know from this sound that the user
has forgotten or stolen a portable item such as a wallet.
[0022]
According to the present embodiment, since the piezoelectric speaker is used, the receiving card
210 can be made thin and the driving voltage of the receiving card 210 can be suppressed low.
[0023]
A specific example is shown in FIG.
First, FIG. 7A is an example in which the reception card 210 is stored in the wallet 220. When
the wallet 220 is dropped or stolen and the distance from the transmission card 200 is increased,
the reception card 210 is pronounced. The figure (B) is an example which made the child 230
carry the reception card 210, and since it is pronounced when the reception card 210 is uttered
in crowded places such as a department store or an amusement park, it can be easily found.
[0024]
FIG. 6C is an example in which the function of the reception card 210 is incorporated in the key
240, and FIG. 6D is an example in which the function of the reception card 210 is incorporated in
the key holder 250. In any case, it is possible to prevent the loss or theft of the key 240 or the
key 252 attached to the key ring 250.
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[0025]
Embodiment 3 Next, Embodiment 3 will be described with reference to FIG. This example is an
example in which a piezoelectric speaker 302 is attached to a business card 300 as shown in FIG.
A flash memory 304, a data acquisition unit 306, a DAC (digital to analog converter) 308, and a
diode 310 are built in the business card 300 as shown in FIG. It is connected. The recording
terminal 305 of the flash memory 304 is exposed from the business card 300.
[0026]
When the business card 300 is used, a desired signal recording adapter is first used to digitally
record a desired audio signal in the flash memory 304 using the recording terminal 305. Then, in
use, the piezoelectric speaker 302 is pressed. Since the piezoelectric speaker 302 uses a
piezoelectric material as described above, it outputs a signal by pressing. This signal is supplied
to the data acquisition unit 306 by the diode 310. Then, the audio signal recorded in the flash
memory 304 is acquired by the data acquisition unit 306, converted into an analog signal by the
DAC 308, and supplied to the piezoelectric speaker 302. Thereby, the sound corresponding to
the sound signal is output from the piezoelectric speaker 302. For example, as shown in Figure 5
(C), "You are a newcomer. Thank you. And so on.
[0027]
Of course, if a plurality of audio signals are stored in the flash memory 304 and data acquisition
is performed in correspondence with the number of times the piezoelectric speaker 302 is
pressed, it is possible to change the audio according to the situation. Become. According to the
present embodiment, it is possible to give the novel function that the business card speaks, and
to give a unique and strong impression.
[0028]
Embodiment 4 Next, Embodiment 4 will be described with reference to FIG. In this example, as
shown in FIG. 6A, a piezoelectric speaker 402 is attached to a remote control such as a television
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or an air conditioner or a keyless remote control 400 of a car. As shown in FIG. 7B, the remote
controller 400 is provided with an audio signal data memory 404 storing audio signal data, a
data reading unit 406, and a DAC 408. When any of the buttons 410 of the remote control 400
is operated, the operation button information is input to the data reading unit 406. Then, the
data reading unit 406 reads out the audio signal data corresponding to the operation button
from the audio signal data memory 404. The read audio signal is converted from a digital signal
to an analog signal by the DAC 408 and supplied to the piezoelectric speaker 402. Thereby, the
sound corresponding to the sound signal is output from the piezoelectric speaker 402.
[0029]
For example, when the channel is switched from “1” to “3” by the remote control of the
television, an audio “channel is switched to 3” is output. By doing this, voice guidance
corresponding to the button operation can be performed.
[0030]
Note that voice guidance may be performed based on the reception confirmation signal from the
operation partner. For example, when the button of channel "3" is operated by the remote control
of the television, the channel is switched to "3" based on this, and a reception confirmation signal
is sent from the television to the remote control. When the reception confirmation signal is
received by the remote control 400, the data is read out, and the voice guidance "channel
switched to 3" is performed. By doing this, the user can confirm at hand that the other party has
received the operation signal, and reliable remote control operation can be performed.
[0031]
<Other Embodiments> The present invention is not limited to the above embodiment, and can be
applied to various portable and portable devices and devices driven by batteries.
[0032]
As described above, according to the present invention, a piezoelectric speaker using a
piezoelectric element having a laminated structure is used. Can be driven well and there is an
effect that a novel function can be added.
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[0033]
Brief description of the drawings
[0034]
1 is a diagram showing a first embodiment of the present invention.
[0035]
2 is a main sectional view showing a laminated structure of the piezoelectric drive according to
the embodiment.
[0036]
3 is a diagram showing a second embodiment of the present invention.
[0037]
4 is a diagram showing an application example of the second embodiment.
[0038]
5 is a diagram showing a third embodiment of the present invention.
[0039]
6 is a diagram showing a fourth embodiment of the present invention.
[0040]
7 is a diagram showing the structure of a conventional piezoelectric drive.
[0041]
Explanation of sign
[0042]
10: Piezoelectric elements 12A to 12C: Piezoelectric layers 14A to 14D: Electrode layers 20: Shim
plate 30: Piezoelectric elements 32A to 32C: Piezoelectric layers 34A to 34D: Electrode layers
100: Watch 102: Piezoelectric speaker 110: Acceleration sensor 112: Data Capturing unit 114:
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clock unit 115: voice synthesis unit 116: power supply 120: calculator 122: solar battery 124:
piezoelectric speaker 126: key group 128: equal key 200: transmission card 202: transmission
unit 204: antenna 210: reception card 212 ... Antenna 214 ... Reception unit 216 ... Reception
level detection unit 218 ... Piezoelectric speaker 220 ... Wallet 230 ... Child 240 ... Key 250 ... Key
holder 252 ... Key 300 ... Business card 302 ... Piezoelectric speaker 304 ... Flash memory 305 ...
Recording terminal 306 ... Data Capturing unit 308 ... DAC 310 ... diode 400 ... Over less remote
control 402 ... piezoelectric speaker 404 ... audio signal data memory 406 ... data reading part
408 ... DAC 410 ... button
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