JP2008036450A - Spray device and drive control method of piezoelectric vibrator - Google Patents

Abstract

A piezoelectric vibrator drive control method that does not require an adjustment process or readjustment for adjusting the frequency of a voltage applied to a piezoelectric vibrator to the resonance frequency of each piezoelectric vibrator while securing a predetermined spray amount, and A spraying device is provided.
[Problem means]
A beat plate for spraying liquid in a mist, a piezoelectric vibrator for vibrating the beat plate, and a driving means for driving the piezoelectric vibrator, wherein the driving means sets a vibration frequency of the piezoelectric vibrator to a predetermined value. The piezoelectric vibrator is driven by sweeping within a frequency range. Here, the resonance frequency of the piezoelectric vibrator is included in the frequency range of the predetermined range that is the vibration frequency of the piezoelectric vibrator, and in particular, the center frequency that is the vibration frequency of the piezoelectric vibrator is the piezoelectric vibration. It is approximately equal to the resonance frequency of the child.
[Selection] Figure 6

Description

  The present invention relates to a spraying device that releases a raw material liquid such as a medicine used for hygiene or cosmetics in the form of a mist, and in particular, a beat plate constituting spraying means in such a spraying device. The present invention relates to a drive control apparatus and method for a piezoelectric vibrator that is driven to vibrate.

  A spraying device that discharges a liquid containing medicinal components for hygiene or cosmetic use in the form of a mist into the air, supplies droplets to a beat plate (vibrating plate), and a piezoelectric vibrator joined to the beat plate For example, the liquid is sprayed by being driven to vibrate at a frequency in the ultrasonic frequency band.

  In such a spraying device, conventionally, the frequency of the voltage applied to the piezoelectric vibrator is matched with the resonance frequency of the piezoelectric vibrator, thereby increasing the vibration width of the piezoelectric vibrator and increasing the amount of spraying. I am doing so.

  By the way, as a driving method for driving the piezoelectric vibrator, two types of driving methods, a self-excited driving method and a separately excited driving method, are known. The self-excited driving method uses the self-oscillation characteristic of the piezoelectric vibrator, and the separately excited driving method uses a predetermined frequency from the outside to the piezoelectric vibrator without using the self-oscillation characteristic of the piezoelectric vibrator. This voltage is applied.

As such a separately excited drive system, the frequency of the voltage applied to the piezoelectric vibrator is matched with the resonance frequency of the composite of the beat plate and the piezoelectric vibrator, so that the maximum spray amount can be obtained. An acoustic film forming apparatus is also known (see, for example, Patent Document 1).
Japanese Patent No. 3527998

  However, in the self-excited drive method, even if the piezoelectric vibrator is driven at the same frequency as the resonance frequency, if the resonance frequency of the piezoelectric vibrator deviates more than a certain value from the resonance frequency of the beat plate, do not spray. was there. Further, since the piezoelectric vibrator and the beat plate are deteriorated by continuing to drive the vibration at the resonance frequency of the piezoelectric vibrator, it is difficult to extend the life of the spraying device.

  On the other hand, in the separately excited drive method, the resonance frequency of the piezoelectric vibrator to be used is measured one by one for each piezoelectric vibrator, and the frequency of the voltage applied to the piezoelectric vibrator is driven to match the measurement result. A process for adjusting the frequency was required. In addition, a sound in the audible sound region of 20 to 40 times the vibration frequency of the beat plate may be generated.

  Furthermore, the resonance frequency of piezoelectric elements and beat plates may shift when used for a long period of time. In this case, if the drive frequency of the oscillation circuit is readjusted or cannot be readjusted, the spraying ability will be significantly reduced. As a result, there has been a situation in which the spray device has to be discarded.

  The present invention has been made in view of the above-described problems of the prior art, and adjusts the frequency of the voltage applied to the piezoelectric vibrator to the resonance frequency of each piezoelectric vibrator while ensuring a predetermined spray amount. An object of the present invention is to provide a piezoelectric vibrator drive control method and a spray device that do not require processes and readjustment.

  In order to achieve the above object, the present invention comprises a beat plate that sprays liquid in a mist, a piezoelectric vibrator that vibrates the beat plate, and a drive means that drives the piezoelectric vibrator, and the drive means. Provides a spraying device characterized in that the piezoelectric vibrator is driven by sweeping the vibration frequency of the piezoelectric vibrator within a predetermined frequency range.

  Here, the vibration frequency is an ultrasonic frequency, and the frequency range to be swept is a predetermined center frequency ± 5 kHz. The resonance frequency of the piezoelectric vibrator is included in the predetermined frequency range that is the vibration frequency of the piezoelectric vibrator. In particular, the center frequency that is the vibration frequency of the piezoelectric vibrator is the piezoelectric vibrator. It is characterized by substantially equal to the resonance frequency.

  The driving means drives the piezoelectric vibrator by sequentially changing a plurality of stages of frequencies set within the predetermined frequency range every 0.5 to 5 milliseconds, one by one successively. To.

  The present invention further relates to a drive control method for a piezoelectric vibrator that supplies vibration energy to a beat plate that sprays liquid in the form of a mist, wherein the vibration frequency of the piezoelectric vibrator is swept within a predetermined frequency range. The present invention provides a drive control method for a piezoelectric vibrator characterized by being driven.

  Here, in this drive control method, (a) driving the piezoelectric vibrator for a predetermined time at one of a plurality of stages set within the predetermined frequency range; and (b) the plurality of stages. (C) driving the piezoelectric vibrator for a predetermined time at a maximum frequency of the driving frequency; and (d) driving the plurality of piezoelectric vibrators for a predetermined time at a frequency successively higher by one step. Steps of sequentially driving the piezoelectric vibrators for a predetermined time at a frequency that is one step lower in sequence and (e) driving the piezoelectric vibrator at a minimum frequency of the driving frequency for a predetermined time. The steps (b) to (e) are repeated.

  Thus, in the spray device and the drive control method of the piezoelectric vibrator, the vibration frequency of the piezoelectric vibrator is swept within a predetermined frequency range and driven, so that the frequency of the voltage applied to the piezoelectric vibrator can be set individually. An adjustment process for adjusting to the resonance frequency of the piezoelectric vibrator is not required.

  On the other hand, the resonance frequency of the piezoelectric vibrator is included in the predetermined frequency range that is the vibration frequency of the piezoelectric vibrator, and the center frequency that is the vibration frequency of the piezoelectric vibrator is the resonance frequency of the piezoelectric vibrator. By substantially equaling the frequency, a certain amount or more of spraying was ensured.

  Furthermore, in this spraying device, since the piezoelectric vibrator and the beat plate are not continuously driven at the resonance frequency, it is possible to suppress the chatter noise and mechanical vibration generated by the vibration driving, Durability was improved and the life of the device could be extended.

  In this spraying device, it is not necessary to adjust the frequency of the voltage applied to the piezoelectric vibrator to the resonance frequency of each piezoelectric vibrator. It enabled maintenance by itself.

  Hereinafter, the spray device and the piezoelectric vibrator drive control method according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an example of an electrolyzed water spray apparatus 100 to which the present invention can be applied. The electrolyzed water spray apparatus 100 is attached to the electrolyzed water spray apparatus main body 102 and the electrolyzed water spray apparatus main body 102. And the spraying part 104.

  An electrolyte aqueous solution tank 4 is housed inside the housing 2 of the electrolyzed water spray apparatus main body 102. The electrolyte in the aqueous solution is preferably an alkali metal salt such as sodium chloride, potassium chloride or calcium chloride, an alkaline earth salt, or an organic acid such as ascorbic acid. As electrolyte concentration, 0.015-0.9 mass% is preferable.

  A pump 6 is attached below the electrolyte aqueous solution tank 4, and the electrolyte aqueous solution accommodated in the electrolyte aqueous solution tank 4 is supplied to the pump 6 through an electrolyte aqueous solution supply pipe 8. The aqueous electrolyte solution supplied to the pump 6 is then pumped by the pump 6 and supplied to the electrolytic cell 12 through the delivery pipe 10.

  FIG. 3 is an enlarged view showing the electrolytic cell 12. The electrolytic cell 12 has an anode 16 and a cathode 18 arranged in parallel in a flat electrolytic cell housing 14. Reference numeral 20 denotes an anode terminal connected to the anode 16, and 22 denotes a cathode terminal connected to the cathode 18, which are respectively drawn out from the lower end of the electrolytic cell housing 14.

  The aqueous electrolyte solution supplied from the pump 6 is supplied into the electrolytic cell 12 through an inflow hole 24 formed in the lower part of the electrolytic cell 12 and moves upward in the electrolytic cell 12 while maintaining a laminar flow state. 16, electrolysis is performed by the voltage applied between the cathode 18 and anode water (acidic water) is generated near the anode 16, and cathode water (alkaline water) is generated near the cathode 18.

  Since the aqueous electrolyte solution in the electrolytic cell 12 flows in a laminar flow state, the generated anodic water flows upward along the surface of the anode 16 as indicated by the arrow A, and only the anodic water is on the upper side of the electrolytic cell 12. And is supplied to a spraying means 28 which will be described later.

  On the other hand, the cathode water generated in the electrolytic cell 12 moves upward along the cathode 18 as shown by the arrow B shown in FIG. 3 and is discharged from the discharge pipe 30 connected to the upper side of the electrolytic cell 12. It is sent to a later-described waste liquid tank 32 attached above the pump 6 and temporarily stored as waste liquid. The waste liquid tank 32 is mounted in the housing 4 at a height substantially equal to the electrolytic cell 12 and the aqueous electrolyte solution tank 4 above the pump 6.

  In FIG. 1, a spray portion 104 is attached to the electrolyzed water spray device main body 102 in front of the outflow pipe 26 formed on the upper side of the electrolytic cell 12.

  As a method for attaching the spray unit 104, for example, a normal fitting means using a slide guide, a locking projection, or the like is exemplified.

  As shown in FIG. 1, the spray unit 104 includes a spray unit main body 34 in which the spray means 28 is housed, and a spray unit opening / closing cover 36 attached to the upper part.

  The spraying means 28 that discharges the droplets in the form of a mist in the spray unit 104 includes a beat plate 28a and a piezoelectric vibrator 28b. The beat plate 28a usually has a large number of through holes having a hole diameter of 18 to 24 μm, and its end is fixed to the piezoelectric vibrator 28b. When a voltage having an ultrasonic frequency is applied to the piezoelectric vibrator 28b, the piezoelectric vibrator 28b vibrates, and accordingly, the beat plate 28a fixed to the vibrator 28b vibrates. As a result, as will be described later, the electrolyzed water supplied from the outflow pipe 26 is sprayed to the outside as a fine droplet through a large number of through holes formed in the beat plate 28a.

  The spray part opening / closing cover 36 is attached to the spray part main body 34 so as to be slidable in the vertical direction and covers the spray means 28. On the side of the electrolyzed water spraying device main body 102 of the spray part opening / closing cover 36, a discharge port opening / closing means 38 made of a flat plate is suspended from the upper part of the cover 36 to the outflow pipe 26. It is in contact with the discharge opening / closing means 38. For this reason, the front-end | tip of the outflow tube 26 is obstruct | occluded, and electrolyzed water does not leak out.

  A magnet 40 is attached to the upper part of the cover 36, and the position of the cover 36 can be detected in cooperation with a reed switch 42 attached to the corresponding electrolyzed water spraying device main body 102 side.

  The control unit 44 integrally controls the pump 6, the electrolytic cell 12, the spraying means 28, and the like by incorporating a microprocessor 112 that will be described in detail later. In addition, a signal from the reed switch 42 and the like is input to the control unit 44. The drive power supply 46 supplies electric power having a necessary voltage value to the control unit 44, the pump 6, the electrolytic cell 12, the spraying means 28, and the like. As the driving power source 46, not only a primary battery but also a rechargeable secondary battery can be used. Moreover, you may make it supply electric power by making a commercial alternating current power supply into AC / DC conversion. Here, the wiring 54 supplies the power of the drive power supply 46 to the control 44 unit. In addition, the wiring 48 supplies the electrolytic cell 12 with controlled electric power suitable for electrolysis. The signal line 50 connects the reed switch 42 and the control unit, and the wiring 52 supplies controlled power from the control unit 44 to the pump 6.

  Further, the packings 55 and 56 are made of an elastic body such as rubber interposed between the inner wall of the casing 2 and the electrolytic cell 12, and constitute a waterproof structure. This waterproof structure prevents the anode water from entering the electrolytic water spraying device main body 102.

  Next, the case where the electrolyzed water is sprayed using the electrolyzed water spray device will be described.

  As shown in FIG. 2, the cover 36 is first pulled upward. Thereby, the discharge port opening / closing means 38 is also moved upward, and the discharge port of the outflow pipe 26 is changed from the closed state to the open state.

  On the other hand, the magnet 40 attached to the cover 36 is also moved upward and separated from the reed switch 42. The control unit 44 that has detected this state supplies the power of the drive power supply 46 to the pump 6, the electrolytic cell 12, and the spraying means 28, whereby the pump 6 is operated, and the electrolyte aqueous solution in the electrolyte aqueous solution tank 4 is the electrolyte aqueous solution supply pipe. 8. It is sent to the electrolytic cell 12 through the pump 6 and the delivery pipe 10, where it is electrolyzed.

  The anodized water generated on the anode side in the electrolytic cell 12 passes through the outflow pipe 26, is supplied as a droplet 58 from the discharge port at the tip thereof, and is supplied to the vibrating beat plate 28a, and further formed on the beat plate 28a. It sprays ahead of the beat plate 28a through the fine through hole. On the other hand, the cathode water is sent to the waste liquid tank 32 through the discharge pipe 30 and temporarily stored therein, and then appropriately discharged outside.

  By the way, in the example of the spraying apparatus described above, the electrolyte aqueous solution is supplied to the beat plate 28a side by the water pressure obtained by the pump 6, but a porous sponge or filter has no pump. The aqueous electrolyte solution may be supplied to the beat plate 28a side by utilizing capillary action. In this spraying apparatus, most of the beat plates 28a have conventionally used platinum or nickel materials, but in this apparatus, palladium may be used in addition to these materials.

  When the spraying of the electrolyzed water is finished and the spraying is stopped, the cover 36 is pushed downward. Then, the magnet approaches the reed switch 42 and a signal is sent to the control unit through the signal line 50. Thereby, the electric power supplied to the electrolytic cell 12 and the pump 6 is cut off, and the spraying of electrolytic water is stopped.

  In the above example, the reed switch 42 serves as a switch for the electrolyzed water spraying operation. However, the present invention is not limited to this. The power switch is separately provided, and the cover 36 is opened, and then the power switch is turned on to spray the electrolyzed water. It may be configured to start. In this case, by spraying the electrolyzed water under the AND condition of the reed switch 42 and the power switch, the electrolyzed water is not sprayed even when the power switch is turned on when the cover 36 is not pulled up, It is possible to reliably prevent erroneous spraying due to erroneous operation. In addition, while using the electrolyzed water spray device of the present invention for a long time, spraying failure of electrolyzed water may occur. The poor spraying of the electrolyzed water occurs due to the clogging of the through hole of the beat plate 28a due to the electrolyte that is dried and deposited while the electrolyzed water is attached to the spraying means.

  When a spray failure occurs, the spray failure can be solved by removing the spray unit 104 from the electrolyzed water spray apparatus main body 102 and replacing it with the spray unit 104 that normally sprays.

  Next, driving means for driving the piezoelectric vibrator 28b (FIG. 1) of the present invention will be described.

  As described above, the spray means 28 that discharges droplets in the form of mist in the spray unit 104 (FIG. 1) includes the beat plate 28a and the piezoelectric vibrator 28b. The piezoelectric vibrator 28b (FIG. 1) is driven to vibrate by the driving means 110.

  FIG. 4 shows an example of the overall configuration of the driving means 110 for driving the piezoelectric vibrator 28b to vibrate. As shown in FIG. 4, the driving means 110 includes an oscillation circuit 112 including a crystal resonator that outputs a signal with an extremely stable oscillation frequency, and a microprocessor that inputs an oscillation signal with a predetermined frequency output from the oscillation circuit 112. 113 and a drive circuit 114 for driving the piezoelectric vibrator 28b by a drive signal output from the microprocessor 113. Here, as will be described later, the microprocessor 113 creates a drive signal for driving by driving the vibration frequency of the piezoelectric vibrator 28b within a predetermined frequency range, and outputs the drive signal to the drive circuit 113 side. is there.

  It should be noted in the configuration of the driving means 110 of the present invention shown in FIG. 4 that the adjustment for adjusting the oscillation frequency of the oscillation circuit 111 to the resonance frequency of the piezoelectric vibrator 28b, like the driving means of the piezoelectric vibrator in the conventional apparatus. No circuit is required. Accordingly, the present invention does not require an adjustment circuit for adjusting the frequency of the voltage applied to the piezoelectric vibrator to the resonance frequency of each piezoelectric vibrator 28b and an adjustment step for adjusting the resonance frequency of the piezoelectric vibrator 28b by this adjustment circuit. It is.

FIG. 5 shows a specific example of the drive circuit 113 shown in FIG. As shown in FIG. 5, the driving circuit 113 receives the driving signal output from the microprocessor 113 (FIG. 4), amplifies the amplifier, the transistor T driven by the amplifier AMP, and its primary winding. One is connected to a predetermined DC voltage V and the other is connected to the transistor T, and an inductance L is connected to one of the secondary windings of the transformer Tr.
The inductance L is connected to the electrode of the piezoelectric vibrator 28b. Thereby, the piezoelectric vibrator 28b is driven to oscillate at the frequency of the drive signal output from the microprocessor 113 (FIG. 4).

  By the way, the waveform of the driving voltage applied to the piezoelectric vibrator 28b becomes a sine waveform as shown in FIG. Thereby, the present spraying device enables the injection of medicine with low noise and low vibration.

  FIG. 6 shows an example of the waveform of the drive signal output from the microprocessor 113 (FIG. 4). As shown in FIG. 6, when the resonance frequency of the piezoelectric vibrator 28b or the composite of the piezoelectric vibrator and the beat plate 28a is, for example, around 130 KHz, the drive signal output from the microprocessor 113 (FIG. 4) is The piezoelectric vibrator 28b is driven by sweeping within a predetermined frequency range including the resonance frequency of 130 KHz.

  Here, “sweep” means that the piezoelectric vibrator 28b is driven by successively changing a plurality of stages of frequencies set within the predetermined frequency range at a predetermined time interval one by one successively. To do. In the example of the drive signal shown in FIG. 6, the frequency of a plurality of stages (seven stages in the example of FIG. 6) set in the range of 125 to 135 KHz around 130 KHz is set every 1 millisecond (msec) interval. The piezoelectric vibrator 28b is driven by sequentially changing it step by step. In the driving method of the present invention, the resonance frequency of the piezoelectric vibrator 28b to be used is included in the frequency range of 125 to 135 KHz. Desirably, the center frequency of the predetermined range is substantially equal to the resonance frequency of the piezoelectric vibrator 28b in order to ensure a spray amount of a certain value or more.

  By the way, in the example of the drive signal shown in FIG. 6, the frequency of the plurality of stages described above is successively changed one by one successively every 1 millisecond, but within 0.5 to 5 millisecond intervals. An arbitrary time interval may be set.

  FIG. 7 shows the frequency of the oscillation signal (original oscillation) input from the oscillation circuit 112 (FIG. 4) and the frequency of the drive signal created by dividing the original oscillation signal in the microprocessor 113 (FIG. 4). The correspondence relationship of (driving frequency) is described. In the example of FIG. 7, it is assumed that the resonance frequency of the piezoelectric vibrator 28b to be used is 130 KHz.

  As shown in FIG. 7, when an oscillation signal of 20 MHz is supplied from the oscillation circuit 112, a drive signal of 126.58 KHz is obtained by dividing the frequency by 158 in the microprocessor 113 (FIG. 4). Similarly, divide by 157 / 127.39 Kz, 156 divide / 128.21 Kz, 155 divide / 129.03 Kz, 154 divide / 129.87 Kz, 153 divide / 130.72 Kz, 152 divide / 131.58 Kz , 151 division / 132.45 Kz, 150 division / 133.33 Kz, and 149 division / 134.23 Kz, a total of 10 drive signals.

  In the microprocessor 113 (FIG. 4), various methods are known to obtain such a multi-stage frequency drive signal from the 20 MHz original signal. For example, when “RENESAS, RJJ09B0040-0210Z” is used as the microprocessor 113, it is easy to use the “output compare” function provided therein, for example, as shown in FIG. It is easy to create a drive signal obtained by dividing the original signal (20 MHz). As a matter of course, a plurality of stages of drive signals as shown in FIG. 7 may be created from a frequency dividing circuit provided separately from the microprocessor 113.

  FIG. 8 is a flowchart for explaining a first example of the drive control method of the piezoelectric vibrator according to the present invention.

  In FIG. 8, when the power switch of the spray device is turned on (S10) and the voltage rises, first, it is set within a predetermined frequency range including the resonance frequency of the piezoelectric vibrator 28b to be used (shown in FIG. 7). The piezoelectric vibrator 28b is driven for a predetermined time at one of a plurality of frequencies (S11).

  Next, the piezoelectric vibrator is driven for a predetermined time by successively increasing the frequency of the plurality of steps by one step higher (S12). This is continued, and the piezoelectric vibrator 28b is driven for a predetermined time at the maximum frequency of the drive frequency (S13). In the example of FIG. 7, the maximum frequency is 134.23 KHz.

  Next, the piezoelectric vibrator 28b is driven for a predetermined time by successively lowering the plurality of stages of frequencies one step lower (S14), and this is continued, so that the piezoelectric vibrator 28b is driven at the minimum drive frequency. Drive for a predetermined time (S15). In the example of FIG. 7, the minimum frequency is 126.58 KHz.

  Such sweep driving is repeated during the spraying operation until the power switch is turned off (S16).

  FIG. 9 is a flowchart for explaining a second example of the drive control method of the piezoelectric vibrator according to the present invention.

  In FIG. 9, when the power switch of the spraying device is turned on (S20) and the voltage rises, first, it is set within a predetermined frequency range including the resonance frequency of the piezoelectric vibrator 28b to be used (shown in FIG. 7). The piezoelectric vibrator 28b is driven for a predetermined time at one of a plurality of frequencies (S21).

  Next, the piezoelectric vibrator is driven for a predetermined time by successively lowering the plural stages of frequencies one step lower (S22). This is continued, and the piezoelectric vibrator 28b is driven at a minimum frequency of the drive frequency for a predetermined time (S23). In the example of FIG. 7, the minimum frequency is 126.58 KHz.

  Next, the piezoelectric vibrator 28b is driven for a predetermined time by successively increasing the frequency of the plurality of stages by one step higher (S24), and this is continued, and the piezoelectric vibrator 28b is driven at the maximum driving frequency. Drive for a predetermined time (S25). In the example of FIG. 7, the maximum frequency is 134.22 KHz. Such sweep driving is repeated during the spraying operation until the power switch is turned off (S26).

  Here, in many cases, the driving period of the frequency at each stage described above is set to 0.5 to 5 milliseconds. The maximum frequency of the drive signal is +5 kHz of the center frequency, and the minimum frequency is −5 kHz of the center frequency. By the way, the resonance frequency of the piezoelectric vibrator 28b is included between the maximum frequency and the minimum frequency. The center frequency is preferably substantially equal to the resonance frequency of the piezoelectric vibrator 28b. Thereby, in the present spraying device, a spray amount greater than a predetermined value can be ensured.

  As described above in detail, the spray device includes a beat plate that sprays liquid in the form of a mist, a piezoelectric vibrator 28b that vibrates the beat plate 28a, and a drive unit that drives the piezoelectric vibrator 28b. The driving means sweeps and drives the vibration frequency of the piezoelectric vibrator 28b within a predetermined frequency range. This eliminates the need for an adjustment step for adjusting the frequency of the voltage applied to the piezoelectric vibrator 28b to the resonance frequency of each piezoelectric vibrator 28b, which is required in the prior art, and the resonance frequency of the piezoelectric vibrator 28b is The center frequency, which is included in the frequency range of the predetermined range, which is the vibration frequency of the piezoelectric vibrator 28b, and preferably the vibration frequency of the piezoelectric vibrator 28b, is approximately equal to the resonance frequency of the piezoelectric vibrator 28b. It was possible to secure a spray amount above a certain level.

  Further, in this spraying device, since the piezoelectric vibrator and the beat plate are not continuously driven at the resonance frequency, the chatter noise and mechanical vibration of the device caused by the vibration drive are suppressed, and the device It has improved durability and extended the life of the device.

  By the way, although the spraying device has been described as an example to which the driving method of the piezoelectric vibrator of the present invention is applied, the driving device is a medical device, a measuring instrument, or a sensor device that drives an ultrasonic motor and uses the ultrasonic vibrator. The scope of the present invention extends to these devices and the like as long as those skilled in the art can easily implement or understand.

  TECHNICAL FIELD The present invention relates to a spraying device that releases a raw material liquid such as a medicine used for hygiene or cosmetics in the form of a mist, and in particular, vibrates a beat plate that constitutes a spraying means in such a spraying device. The present invention relates to a drive control apparatus and method for a piezoelectric vibrator to be driven, and has industrial applicability.

It is a schematic block diagram which shows the example (electrolyzed water spraying apparatus) of the spraying apparatus of this invention. It is explanatory drawing which shows the spraying state of the electrolyzed water spraying apparatus shown in FIG. It is an enlarged block diagram which shows the electrolytic vessel of the electrolyzed water spray apparatus shown in FIG. The example of the whole structure of the drive means 110 for carrying out the vibration drive of the piezoelectric vibrator 28b is shown. A specific example of the drive circuit 113 illustrated in FIG. 4 will be described. The example of the waveform of the drive signal output from the microprocessor 113 (FIG. 4) is shown. In the microprocessor 113 (FIG. 4), the frequency of the oscillation signal (original oscillation) input from the oscillation circuit 112 (FIG. 4) and the frequency of the drive signal (drive frequency) created by dividing the original oscillation signal It is the table | surface which described the corresponding | compatible relationship. 5 shows a flowchart for explaining a first example of a drive control method of a piezoelectric vibrator according to the present invention. 6 shows a flowchart for explaining a second example of the piezoelectric vibrator drive control method according to the present invention. The waveform of the drive voltage applied to the piezoelectric vibrator 28b in the drive circuit of this invention is shown.

Explanation of symbols

2 Housing (casing)
4 Electrolyte aqueous solution tank 6 Pump 8 Electrolyte aqueous solution supply pipe 10 Delivery pipe 12 Electrolytic tank 14 Electrolytic tank housing 16 Anode 18 Cathode 20 Anode terminal 22 Cathode terminal 24 Inflow hole 26 Outflow pipe 28 Spraying means 28 a Beat plate 28 b Piezoelectric vibrator 30 Discharge Pipe 32 Waste liquid tank 34 Spray section main body 36 Spray section opening / closing cover 38 Discharge port opening / closing means 40 Magnet 42 Reed switch 44 Control section 46 Drive power supply 48, 52, 54 Wiring 50 Signal line 55, 56 Packing 58 Droplet 100 Electrolyzed water spray device DESCRIPTION OF SYMBOLS 102 Electrolyzed water spray apparatus main body 104 Spray part 110 Driving means 112 Oscillation circuit (including crystal vibration)
113 Microprocessor constituting control device 114 Drive circuit 500 Spraying device (electrolyte spraying device)
502 Electrolyte aqueous solution tank 504 Electrolyte aqueous solution 506 Pump 508 Electrolytic tank 510 Spraying part 512 Discharge pipe 514 Waste liquid tank

Claims (12)

A beet plate that sprays liquid in a mist,
A piezoelectric vibrator for vibrating the beat plate;
Driving means for driving the piezoelectric vibrator,
The spraying device characterized in that the driving means drives the piezoelectric vibrator by sweeping a vibration frequency of the piezoelectric vibrator within a predetermined frequency range.   2. The spray device according to claim 1, wherein the vibration frequency is an ultrasonic frequency, and the frequency range to be swept is in a range of a predetermined center frequency ± 5 kHz.   The spraying device according to claim 2, wherein the resonance frequency of the piezoelectric vibrator is included in a frequency range of the predetermined range that is a vibration frequency of the piezoelectric vibrator.   The spraying device according to claim 3, wherein the center frequency which is a vibration frequency of the piezoelectric vibrator is substantially equal to a resonance frequency of the piezoelectric vibrator.   The driving means drives the piezoelectric vibrator by successively changing a plurality of stages of frequencies set within the predetermined frequency range at intervals of 0.5 to 5 milliseconds one by one successively. The spraying device according to claim 1. A drive control method for a piezoelectric vibrator that supplies vibration energy to a beat plate that sprays liquid in the form of a mist,
A drive control method for a piezoelectric vibrator, wherein the drive is performed by sweeping a vibration frequency of the piezoelectric vibrator within a predetermined frequency range. (A) driving the piezoelectric vibrator for a predetermined time at one of a plurality of stages of frequencies set within the predetermined frequency range;
(B) driving the piezoelectric vibrator for a predetermined time at a frequency one step higher than the plurality of phases in succession;
(C) driving the piezoelectric vibrator at a maximum frequency of the driving frequency for a predetermined time;
(D) driving the piezoelectric vibrator for a predetermined time at a frequency one step lower than the plurality of stages in succession;
(E) driving the piezoelectric vibrator at a minimum frequency of the driving frequency for a predetermined time;
(F) repeating the steps (b) to (e);
The drive control method according to claim 6, comprising the steps of: (A) driving the piezoelectric vibrator for a predetermined time at one of a plurality of stages of frequencies set within the predetermined frequency range;
(B) driving the piezoelectric vibrator for a predetermined time at a frequency one step lower than the plurality of stages in succession;
(C) driving the piezoelectric vibrator at a minimum frequency of the driving frequency for a predetermined time;
(D) driving the piezoelectric vibrator for a predetermined time at a frequency one step higher than the plurality of phases in succession;
(E) driving the piezoelectric vibrator at a maximum frequency of the driving frequency for a predetermined time;
(F) repeating the steps (b) to (e);
The drive control method according to claim 6, comprising the steps of:   The drive control method according to claim 7 or 8, wherein the predetermined time is set to 0.5 to 5 milliseconds.   The drive control method according to claim 9, wherein the maximum frequency is a central frequency of +5 kHz, and the minimum frequency is a central frequency of −5 kHz.   The drive control method according to claim 10, wherein a resonance frequency of the piezoelectric vibrator is included between the maximum frequency and the minimum frequency.   The drive control method according to claim 10, wherein the center frequency is substantially equal to a resonance frequency of the piezoelectric vibrator.

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