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DESCRIPTION JPH09322298

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DESCRIPTION JPH09322298
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electronic device equipped with a piezo element.
[0002]
2. Description of the Related Art FIG. 8 shows an electronic apparatus equipped with a
conventional piezo element. As shown in FIG. 8, the piezoelectric element output signal 812
output from the mounting function piezo element 804 and the electrical control signal 212
generated by the switch means 802 are input to the control IC 801, and according to the input
signals. The driving of the on-board function 803 is controlled by the function control signal 811
output from the control IC 801.
[0003]
SUMMARY OF THE INVENTION In the conventional electronic device equipped with the
piezoelectric element, the switch means is provided, and the drive of each function of the
electronic device is controlled by the electrical control signal generated by the switch means.
Because many switches are required, the space can not be reduced, and it takes time because it is
necessary to switch the switch means manually.
[0004]
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[Means for Solving the Problems] In order to solve the above-mentioned problems, the present
invention has taken the following means.
A piezoelectric element of an electronic device equipped with a piezoelectric element is provided
with a monitor electrode for outputting an electric impact signal generated from the piezoelectric
element when receiving an external impact, and the electric impact signal is output from the
monitor electrode. An electrical control signal conversion circuit for converting the output
electrical shock signal into an electrical control signal, wherein the electrical control signal
conversion circuit converts the electrical shock signal into an electrical control signal; Driving of
each function of the electronic device is controlled by a control signal.
[0005]
By taking the above means, the following effects can be obtained. Since an electrical control
signal for controlling the drive of each function of the electronic device can be generated by
applying an impact to a piezo element mounted on the electronic device, a switch for generating
an electrical control signal of that amount As a result, it is possible to miniaturize the electronic
device, and it is not easy to switch the switch means manually in order to generate the electrical
control signal.
[0006]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention
will be described based on the drawings. FIG. 1 is a schematic external view of a piezoelectric
transformer using a piezoelectric element according to a first embodiment of the present
invention.
[0007]
The first input electrode 12 and the second input electrode 13 to which an electrical resonance
signal for causing the piezoelectric element 11 to resonate is input, and the electrical resonance
signal is generated and generated from the piezoelectric element 11 when the piezoelectric
element 11 resonates. An output electrode 14 for outputting an electrical amplification signal
whose amplitude is amplified more than that of the electrical resonance signal, and a first
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monitor electrode for monitoring an electrical impact signal generated from the piezo element 11
when an impact is applied to the piezo element 11 The piezoelectric element portion composed
of the first and second monitor electrodes 16 and 16 and sandwiched between the first input
electrode 12 and the second input electrode 13 is polled in the A direction 17 to form the first
input electrode 12 and the second input electrode 13. The piezoelectric element portion
sandwiched between the piezoelectric element portion and the piezoelectric element portion
sandwiched between the output electrode 14 is poled in the B direction 18 and is interposed
between the first monitor electrode 15 and the second monitor electrode 16. Element unit is
polled in the C direction 19.
[0008]
With the above configuration, when the first input electrode 12 and the first monitor electrode
are made the common electrode (GND), and the electrical resonance signal is input to the second
input electrode 13, the A direction 17 by the electrical resonance signal is obtained. The
vibration in the direction and the vibration in the direction B are resonated to obtain the
electrically amplified signal between the first input electrode 12 and the output electrode 14.
Furthermore, when the piezo element 11 is distorted in the C direction 19 by the impact, the
electrical impact signal is obtained between the first monitor electrode 15 and the second
monitor signal 16.
[0009]
Note that the locations of the first monitor electrode 15 and the second monitor electrode 16
may basically be any location of the piezoelectric element as long as the electrical impact signal
is output, and may be common to other electrodes, Depending on the location, other electrical
signals may be picked up. In such a case, it is recommended to provide a means capable of
selectively outputting only the electrical shock signal generated when the piezo element receives
a shock. Moreover, as a material of the piezoelectric element, a lead titanate based material is
recommended.
[0010]
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Further, in the present embodiment, the case where the electrical impact signal can be output by
providing the monitor electrode to the piezoelectric transformer using the piezoelectric element
has been described, but the input of the piezoelectric element having the input electrode is
described. If the component uses a piezoelectric element such as a piezoelectric buzzer that emits
an electric signal by inputting an electrical signal to an electrode and continuously being
distorted, provide the monitor electrode on the piezoelectric element in the component. Needless
to say, it becomes possible to output the electrical shock signal. Also, the position of the monitor
electrode of the piezoelectric element of the piezoelectric buzzer may be basically any position of
the piezoelectric element as long as the electric shock signal is output, and may be common to
other electrodes, Depending on the location, the electrical shock signal may be small or other
electrical signals may be picked up. In such a case, it is recommended to provide an amplification
circuit or to provide a means capable of selectively outputting only an electrical shock signal
generated when the piezoelectric element is subjected to a shock.
[0011]
FIG. 2 shows an electrically amplified signal 217 generated by the piezoelectric transformer 207
described in the first embodiment which is the second embodiment according to the present
invention, which is an electroluminescent element (hereinafter abbreviated as EL). A wristband
having a wristband having a function of emitting light 208 and a function of using an electrical
shock signal 214 generated in a piezo element used for the piezoelectric transformer 207 as an
electrical control signal 212 by an external shock. It is a simplified block diagram.
[0012]
Electrical control of a power source 201, a piezoelectric transformer 207 for generating an
electrical amplification signal 217 necessary for light emission of the EL 208, a display means
205 for displaying time, etc., and an electrical shock signal 214 generated when the piezoelectric
transformer 207 receives an impact Electrical control signal conversion circuit 203 for
converting into signal 212, mode switching means 204 for generating mode control signal 213
for switching whether or not electrical control signal conversion circuit 203 outputs electrical
control signal 212, electrical amplification The EL 208 emits light in response to the signal 217,
the resonance signal generating circuit 206 which gives the piezoelectric transformer 207 the
electrical resonance signal 216, and the display control signal 211 and the resonance signal
generating circuit 206 which make the display means 205 various displays such as time display.
IC 202 for watch that outputs the EL light emission control signal 215 that controls the driving
of Constructed. Further, the watch IC 203 changes the display control signal 211 or the EL light
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emission control signal 215 in accordance with the electrical control signal 212 from the
electrical control signal conversion circuit 203 to display on the display means 205 or the EL
208. Control the light emission of
[0013]
There are the following effects by adopting the above configuration. In the wristwatch of the
present embodiment, in addition to the light emitting function of EL, the arm 208 attached with
the wristwatch is shaken twice, and an electrical impact signal 214 generated by impacting the
piezoelectric transformer 207 twice is used to make the EL 208 Since the light emission control
of the EL 208 and the control of the display means 205 can be performed by the number of
swings of the arm attached with the above-mentioned wristwatch, and the like, the switch means
for controlling the above-mentioned conventionally required functions is not necessary. Will be
Furthermore, since the drive of each function can be controlled by swinging the arm attached
with the wristwatch, it takes time and effort to switch the switch manually.
[0014]
Although the present embodiment shows the case where the resonance signal generating circuit
206 is provided, a clock of a certain frequency taken out from the middle of the division stage of
the crystal oscillation clock of the IC 202 for watch is used as the electric resonance signal 216.
It goes without saying that the resonance signal generating circuit 206 can be omitted if it can be
used. Needless to say, even in the case where functions other than the functions controlled by the
watch IC 202 shown in this embodiment are also controlled, this can be coped with by increasing
the pattern of how to swing the arm attached with the wristwatch.
[0015]
Furthermore, in the present embodiment, the watch having the function of causing the EL to emit
light with the piezoelectric transformer has been described as an example. However, in the
electronic device having the function or the electronic device having the piezoelectric
transformer, By adopting a mechanism for converting an electrical impact signal generated by
applying an impact to the piezoelectric transformer described above into an electrical control
signal, the number of switch means can be reduced, the size can be reduced, and the time for
manual switching can be reduced It goes without saying.
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[0016]
FIG. 3 is a simplified block diagram of the electric control signal conversion circuit 203 and the
mode switching means 204 of the second embodiment according to the present invention.
First, the electrical control signal conversion circuit 203 converts the electrical impulse signal
214 into the electrical pulse signal 311 and the electrical pulse conversion circuit unit 301
converts the electrical pulse signal 311 into the electrical control signal 212. The control signal
conversion circuit unit 302 is configured.
[0017]
Furthermore, the electrical pulse conversion circuit unit 301 may or may not operate in
accordance with the mode control signal 213. That is, with the mode control signal 213, it is
possible to select whether to convert the electrical shock signal 214 into the electrical control
signal 212 or not. Next, the mode switching means 204 is referred to as Vdd (hereinafter
referred to as a HIGH level). And GND (hereinafter referred to as LOW level). And a switch 303
for selecting the
[0018]
FIG. 4 is a circuit diagram of the electrical pulse conversion circuit unit 301 shown in FIG. A
current mirror type comparator circuit 410 in which P channel MOS 404, P channel MOS 405, N
channel MOS 406, and N channel MOS 407 are connected as shown, and depletion type N
channel MOS 402 and N channel MOS 403 are connected as shown. A constant voltage produced
by Vref circuit 420 is input to the gate of P channel MOS 406 of comparator circuit 410, and is
formed of a Vref circuit 420 and a NAND circuit 430, and an electrical shock is applied to the
gate of the other N channel MOS 407. The signal 214 is input, and the comparison result of the
comparator circuit 410 is input to one input of the NAND circuit 430. The mode control signal
213 is input to the other input of the NAND circuit 430. Comparator circuit 410 and Vref circuit
420, Vdd via a P-channel MOS401 the mode control signal 213 is input to the gate via the
inverter circuit 440 is connected.
[0019]
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By adopting the above-described configuration, the output of the comparator circuit is inverted
from the HIGH level to the LOW level only when the voltage of the electrical shock signal 214 is
higher than the voltage of the output of the Vref circuit 420, The signal 213 is converted into
electrical pulses. That is, since the electric shock signal 214 of a voltage equal to or lower than
the output voltage of the Vref circuit 420 is not converted into an electric pulse, the comparator
circuit 410 has a filter function and has a small shock to move the arm attached with the watch.
A low voltage electrical shock signal 214 generated from the piezoelectric transformer can be cut
when the piezoelectric transformer vibrates due to a reaction when applied to the piezoelectric
transformer or when a strong impact is applied to the piezoelectric transformer. Furthermore, the
voltage level of the electrical shock signal 214 to be cut can be freely set by changing the
threshold voltage of each MOS of the Vref circuit 420 or the design value of each MOS. The
electric pulse output from the comparator circuit 410 is inverted by the NAND circuit 430 and
output as the electric pulse signal 212 if the voltage of the mode control signal 213 is at the high
level, and the voltage of the mode control signal 213 is at the low level. Since Vdd is not supplied
to the Vref circuit 420 and the comparator circuit 410 and does not operate, the consumption
current is suppressed and the electrical pulse is not output, and the electrical pulse signal 212 is
set to the HIGH level by the NAND circuit 430. It is fixed.
[0020]
In the present embodiment, although the case where the electrical pulse conversion circuit unit is
constituted by the MOS has been described, another switch device may be used if the same
function can be obtained, and different if the same function is obtained. It may be a circuit
configuration. Further, it goes without saying that an electrical shock signal output from a
component using a piezo element other than a piezoelectric transformer can also be converted
into an electrical pulse signal.
[0021]
FIG. 5 is a simplified circuit diagram of the electrical control signal conversion circuit unit shown
in FIG. The first shift register circuit 501, the second shift register circuit 502, the timer circuit
503, and the NAND circuit 504 are connected as illustrated. The timer circuit 503 receives the
electrical pulse signal 212 input via the first node 511 from the output of the NAND circuit 504
via the fifth node 515 when the rising from the LOW level to the HIGH level. Normally, a reset
signal is output by detecting both the HIGH to LOW level falling of the control signal 212, but for
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several hundred milliseconds after detecting the former, the reset cancel signal is output to the
fourth node. If the latter is detected within several hundred milliseconds when the reset release
signal is output, the output period of the reset release signal is extended to several seconds.
[0022]
The first shift register circuit 501 and the second shift register circuit 502 receive the electrical
pulse signal 212 input through the first node 511 at the clock input terminals 522 and 526, and
the electrical pulse signal 212 starts from the HIGH level. As the LOW level is detected, falling is
detected, and voltage data of the data input terminal 521 or 525 at the time of detection is
output to the data output terminal 523 or 527. Furthermore, when the reset signal or reset
release signal output from the timer circuit 503 through the fourth node 514 is received at the
reset input terminal 524 or 528 and the reset signal is input, the data output terminal 523 or
527 is forced. The level is fixed to the LOW level, and when the reset release signal is input, the
normal operation is performed.
[0023]
The NAND circuit 504 is connected to the second node 512 connecting the data output terminal
523 of the first shift register circuit 501 and the data input terminal 525 of the second shift
register circuit 502, and the data output of the second shift register circuit 502. The third node
513 connected to the terminal 527 is connected to the input, and outputs the electrical control
signal 212 at the LOW level only when both inputs are at the HIGH level.
[0024]
By employing the above configuration, the following operation is possible.
When the electric pulse conversion circuit is turned off by the mode control signal and the
electric pulse signal 212 is fixed at the high level, or from the above state, the electric pulse
conversion circuit is turned on by the mode control signal, In the case where the electrical shock
signal is not input to the electrical pulse conversion circuit unit, when the electrical pulse signal
is at the LOW level, the timer circuit 503 causes the data of the first shift register circuit 501 and
the second shift register 502 to be transmitted. Since the output terminals 523 and 572 are
forced to be at the LOW level, both inputs of the NAND circuit 504 are at the LOW level, and the
electrical control signal 212 is at the HIGH level.
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[0025]
When the electrical shock signal is converted into the electrical pulse signal 212 and the pulse
waveform is input to the first node 511 only once, the timer circuit 503 detects the rising of the
pulse waveform from LOW to HIGH level, Since the reset release signal is output, the first shift
register circuit 501 and the second shift register circuit 502 become operative, and the second
node 512 becomes high level at the fall of the pulse waveform from high level to low level. Since
the third node remains at the LOW level, the electrical control signal 212 of the output of the
NAND circuit 504 remains at the HIGH level, and the second pulse waveform causes the timer
circuit 503 to output the reset release signal If it is input for several milliseconds to switch to the
reset signal, the third node is also set to the HIGH level. Since the electric control signal 212 of
the output of the NAND circuit 504 is at the LOW level, the output period of the reset release
signal from the timer circuit 503 is postponed to several seconds and switched to the reset
signal. The output goes low. However, if this is not the case, the second node 512 also becomes
LOW by the reset signal output from the timer circuit 503, and the first pulse waveform is input
even if the second pulse waveform is input thereafter. As the operation is the same, the electrical
control signal 212 of the output of the NAND circuit 504 remains at the HIGH level.
[0026]
In other words, the electric control signal is applied when two or more shocks are applied to the
piezoelectric transformer and the pulse waveform is not input to the first node 511 twice or
more during several milliseconds when the timer circuit 503 outputs the reset release signal. As
212, the LOW level can not be output for several seconds. Therefore, if the watch IC causes the
EL to emit light only when the electrical control signal 212 is at the LOW level, as described
above, the arm with the watch of this embodiment is swung twice at a certain speed. A function
such as emitting light for a few seconds can be realized.
[0027]
The circuit of the above-mentioned electrical pulse signal conversion circuit unit is an example in
the case of generating an electrical control signal which can be generated by about one switch.
When it is desired to generate a more complicated electrical control signal, it is recommended to
use a combination of several such circuits. In addition, another circuit configuration may be used
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if the same function as the circuit can be obtained.
[0028]
FIG. 6 shows the function of ringing the piezoelectric buzzer according to the third embodiment
of the present invention and the external impact described in the first and second embodiments
when the piezoelectric element used for the piezoelectric buzzer receives an impact. FIG. 7 is a
simplified block diagram of a watch having a wristband with the capability to use the generated
electrical impulse signal 214 as the electrical control signal 212.
[0029]
The power source 201, the distortion signal generating circuit 601 for generating an electrical
distortion signal 612 necessary to continuously distort the piezoelectric buzzer 602, the display
means 205 for displaying time, etc., and the piezoelectric buzzer 602 receive an impact. An
electric control signal conversion circuit 203 which converts the generated electric shock signal
214 into an electric control signal 212, and a mode control signal 213 which switches whether
the electric control signal conversion circuit 203 outputs the electric control signal 212 or not.
Mode switching means 204 for generating an electrical distortion signal 612 and a piezoelectric
buzzer 602 for activating a buzzer, and a display control signal 211 for causing the display
means 205 to perform various displays such as time display, and driving of the distortion signal
generation circuit 601. The clock IC 202 is configured to output a buzzer control signal 611 to
be controlled.
Further, the watch IC 203 changes the display control signal 211 or the buzzer control signal
611 in accordance with the electrical control signal 212 from the electrical control signal
conversion circuit 203 to display on the display means 205 or a piezoelectric buzzer. The drive
of 602 is controlled.
[0030]
There are the following effects by adopting the above configuration. In the wristwatch of the
present embodiment, in addition to the buzzer function of the piezoelectric buzzer 602, the arm
attached with the wristwatch of the present embodiment is swung twice, and an electrical impact
signal 214 generated by applying impact to the piezoelectric buzzer 602 twice. Since the
piezoelectric buzzer 602 can be driven and the display means 205 can be controlled by turning
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off the piezoelectric buzzer 602 and using the number of swings of the arm attached with the
wristwatch, the above-described function is conventionally required. There is no need for a
switch means for controlling the Furthermore, since the drive of each function can be controlled
by swinging the arm attached with the wristwatch, it takes time and effort to switch the switch
manually.
[0031]
Although this embodiment shows the case where the distortion signal generation circuit 601 is
provided, a clock of a certain frequency taken from the middle of the division stage of the crystal
oscillation clock of the IC 202 for watch is used as the electrical distortion signal 612. It goes
without saying that the distortion signal generation circuit 601 can be omitted if it can be used.
Needless to say, even in the case where functions other than the functions controlled by the
watch IC 202 shown in this embodiment are also controlled, this can be coped with by increasing
the pattern of how to swing the arm attached with the wristwatch.
[0032]
Furthermore, although the wristwatch equipped with the piezoelectric buzzer has been described
as an example in the present embodiment, an electrical impact signal generated by applying an
impact to the piezoelectric buzzer described in the present embodiment to an electronic device
equipped with the piezoelectric buzzer is described. It is needless to say that by adopting a
mechanism for converting the signal into an electrical control signal, the number of switch means
can be reduced, the size can be reduced, and the time and labor for manual switching can be
reduced.
[0033]
FIG. 7 shows a function of detecting an impact by an impact sensor 702 which outputs an
electric impact signal 214 generated when an impact is applied to a piezoelectric element
according to a fourth embodiment of the present invention, FIG. 16 is a simplified block diagram
of a wristband-equipped watch having a function of using the electrical shock signal 214 as the
electrical control signal 212.
[0034]
A power supply 201, an electric shock signal detection circuit 701 which receives an electric
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shock signal 214 generated when the shock sensor 702 receives a shock and converts it into a
shock detection signal 711, a display means 205 for displaying time, etc., the electricity The
electric control signal conversion circuit 203 which converts the dynamic impact signal 214 into
the electric control signal 212, and the mode control signal 213 which switches whether the
electric control signal conversion circuit 203 outputs the electric control signal 212 or not
Various modes such as mode switching means 204, shock sensor 702 for outputting the electric
shock signal 214, and a shock detection signal 711 in response to the shock detection signal 711
to indicate that shock is detected, time display, etc. Configured from the clock IC 202 for
outputting the display control signal 211 for causing the display unit 205 to display a simple
display It is.
Furthermore, the watch IC 203 controls various functions such as changing the display control
signal 211 and controlling the display of the display unit 205 in accordance with the electrical
control signal 212 from the electrical control signal conversion circuit 203.
[0035]
There are the following effects by adopting the above configuration.
In the wristwatch of the present embodiment, in addition to the function of detecting the impact
by the impact sensor 702, the arm attached with the wristwatch of the present embodiment is
swung twice, and the electrical generated by applying impact to the impact sensor 702 twice.
Since various functions such as control of the display means 205 can be controlled by switching
the contents displayed on the display means 205 and using the number of swings of the arm
attached with the above-mentioned watch using the impact signal 214, it is necessary in the past
There is no need for a switch means for controlling the above-mentioned function, and
miniaturization can be achieved. Furthermore, since the drive of each function can be controlled
by swinging the arm attached with the wristwatch, it takes time and effort to switch the switch
manually.
[0036]
Needless to say, even in the case where functions other than the functions controlled by the
watch IC 202 shown in this embodiment are also controlled, this can be coped with by increasing
the pattern of how to swing the arm attached with the wristwatch. Furthermore, although the
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wristwatch equipped with the shock sensor has been described as an example in the present
embodiment, an electrical shock signal generated by shocking the shock sensor described in the
present embodiment to an electronic device mounted with the shock sensor is It is needless to
say that by adopting a mechanism for converting into an electrical control signal, the number of
switch means can be reduced, the size can be reduced, and the time for manually switching can
be reduced.
[0037]
As described above, by adopting the present invention in an electronic device, particularly a
portable device, the driving of each function of the electronic device can be controlled by the way
of giving an impact to the electronic device. This eliminates the need for many switches for
controlling the drive of each function, which is required for the conventional electronic device,
and the size can be reduced accordingly, and the time for manually switching the switches is
reduced.
[0038]
Brief description of the drawings
[0039]
1 is a schematic external view showing a piezoelectric transformer using the piezoelectric
element of the first embodiment according to the present invention.
[0040]
2 is a simplified block diagram showing a watch having a wristband according to a second
embodiment of the present invention.
[0041]
3 is a simplified block diagram showing the electric control signal conversion circuit and the
mode switching means of a wristwatch having a wristband according to the second embodiment
of the present invention.
[0042]
4 is a simplified circuit diagram showing an electrical pulse conversion circuit portion in the
electrical control signal conversion circuit of a wristwatch having a wristband according to the
second embodiment of the present invention.
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[0043]
5 is a simplified circuit diagram showing an electrical control signal conversion circuit portion in
the electrical control signal conversion circuit of a wristwatch having a wristband according to
the second embodiment of the present invention.
[0044]
6 is a simplified block diagram showing a watch having a wristband according to a third
embodiment of the present invention.
[0045]
7 is a simplified block diagram showing a watch having a wristband according to a fourth
embodiment of the present invention.
[0046]
8 is a simplified block diagram of a conventional electric device incorporating a piezoelectric
element.
[0047]
Explanation of sign
[0048]
11 Piezoelectric element 12 first input electrode 13 second input electrode 14 output electrode
15 first monitor electrode 16 second monitor electrode 203 electric control signal conversion
circuit 204 mode switching means 206 resonance signal generation circuit 207 piezoelectric
transformer 208 EL212 electric control Signal 214 electrical shock signal 216 electrical
resonance signal 217 electrical amplification signal 601 strain signal generating circuit 602
piezoelectric buzzer 612 electrical distortion signal 701 electrical shock signal detection circuit
702 shock sensor
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