KR100566398B1 - Ultrasonic generating toothbrush - Google Patents

Abstract

The present invention relates to an ultrasonic toothbrush, and more particularly, to an ultrasonic toothbrush equipped with a small ultrasonic generating horn bonded to a piezoelectric ceramic, which can effectively generate ultrasonic vibrations to minimize power consumption, and to clean the oral cavity and softly formed initially. The present invention relates to an ultrasonic toothbrush configured to remove plugs, inhibit bacterial destruction and propagation between gums and teeth, prevent stomatitis from recurring and oral inflammation, and to make bristle exchange cheap and simple.

In order to realize this, the present invention provides a toothbrush having a bristle mounting portion,

An ultrasonic vibrator fastening the metal elastic body and the piezoelectric ceramics by amplifying and transmitting the ultrasonic vibration with bolts and having a mode of the following equation;

(λ: wavelength, Fr (λ / 4): resonance frequency, C: sound velocity of metal elastomer, n: odd)

A driving circuit for generating ultrasonic vibrations;

It characterized in that it comprises a; battery pack for charging to supply the driving power.

According to the present invention, not only the bristle can be replaced more easily, but also the ultrasonic wave generated from the ultrasonic vibrator is transmitted to the oral cavity through the ultrasonic bristle, and the bristle can be replaced with the tartar removal device, and the cavitation area is increased. It can increase the effect of cleaning and treating teeth and gums.

In addition, the strength of the ultrasonic vibrator may be increased to anion the washing water stored in the oral cavity and to generate surfactant ions, thereby providing an effect of increasing the washing effect.

Piezoelectric, Ultrasonic Vibrator

Description

Ultrasonic toothbrush using piezoelectric ultrasonic vibrator             

1 is a cross-sectional view of an ultrasonic toothbrush using a piezoelectric ultrasonic vibrator according to the present invention.

Figure 2 is a perspective view of the ultrasonic vibrator of the ultrasonic toothbrush using the piezoelectric ultrasonic vibrator according to the present invention.

3A to 3F are exploded view parts of ultrasonic vibrators of an ultrasonic toothbrush using piezoelectric ultrasonic vibrators according to the present invention.

4 is a circuit connection diagram of the ultrasonic vibrator of the ultrasonic toothbrush using the piezoelectric ultrasonic vibrator according to the present invention.

5 is a view showing the displacement in the vibration mode of the ultrasonic vibrator of the ultrasonic toothbrush using the piezoelectric ultrasonic vibrator according to the present invention.

6a to 6b are views showing the output current and voltage waveforms of the ultrasonic vibrator of the ultrasonic toothbrush using the piezoelectric ultrasonic vibrator according to the present invention.

7 is a view showing the displacement in the vibration mode of another embodiment of the ultrasonic vibrator in the ultrasonic toothbrush using the piezoelectric ultrasonic vibrator according to the present invention.

8 is a perspective view showing an ultrasonic vibrator according to another embodiment in an ultrasonic toothbrush using a piezoelectric ultrasonic vibrator according to the present invention.

9 is a perspective view of the bristles mounted in the vibration mode of another embodiment of the ultrasonic vibrator in the ultrasonic toothbrush using the piezoelectric ultrasonic vibrator according to the present invention.

10 is a cross-sectional view of the bristle and the handle portion of the ultrasonic toothbrush using a piezoelectric ultrasonic vibrator according to the present invention.

11 is a cross-sectional view of a tartar removal apparatus showing another embodiment in an ultrasonic toothbrush using a piezoelectric ultrasonic vibrator according to the present invention.

Explanation of symbols on the main parts of the drawings

1: handle part 2: battery pack for charging

3: drive circuit 4: partition

5: separator 6: handle groove

7: Silicone rubber packing 8: Silicone elastic rubber

9: piezoelectric ceramic 10: rear metal elastic body

11: metal electrode ring 11 ': electric wire

12: front metal elastomer 13: brush bristle jaw

14: acoustic impedance matching layer 15: leaf spring

16: brush head 17: hanging groove

18: engaging jaw 19: fastening bolt

20: ultrasonic vibrator 30: tartar removal device

35: water supply pipe 40: ultrasonic oscillation circuit

41: output terminal 42: DC input terminal

The present invention relates to an ultrasonic toothbrush, and more particularly, to an ultrasonic toothbrush equipped with a small ultrasonic generating horn bonded to a piezoelectric ceramic, which can effectively generate ultrasonic vibrations to minimize power consumption, and to clean the oral cavity and softly formed initially. The present invention relates to an ultrasonic toothbrush configured to remove plugs, inhibit bacterial destruction and propagation between gums and teeth, prevent stomatitis from recurring and oral inflammation, and to make bristle exchange cheap and simple.

More specifically, the ultrasonic generating horn, which maximizes the ultrasonic vibration of the piezoelectric body, effectively transmits the ultrasonic vibration to the oral cavity and the teeth, and maximizes the sterilization and cleaning effect by effectively generating the cavitation by the ultrasonic wave.

Recently, piezoelectric ceramics are widely used in ultrasonic applications, displacement generators, and various sensors in various fields such as electronics, communications, and machinery.

It is used as an ultrasonic vibrator, sonar, piezo buzzer, speaker, actuator, etc. by using the characteristic that shrinkage and expansion that match the frequency of the signal when applying an electrical signal to the piezoelectric material. It is used in piezoelectric ignition elements and various sensors using electric energy. In addition, in some cases, the piezoelectric inverter may simultaneously utilize the two energy conversion effects.

The occurrence of mechanical vibration when the electrical signal is applied to the piezoelectric body is called a reverse piezoelectric effect, and is most widely used as an ultrasonic vibrator because most displacement occurs when a voltage of the resonant frequency of the piezoelectric ceramic is applied.

The ultrasonic vibrator converts high frequency power into mechanical vibration and transmits the mechanical vibration to the medium through a vibrating body (typically a horn made of metal).

Generally known electric toothbrushes rotate the bristles mechanically by an electronic motor, which makes it possible to clean the surface of the teeth, but it cannot clean fine gaps between the gums and teeth. Toothbrushes, such as infants are being used prematurely, causing oral wounds, causing inflammation. In addition, toothbrushes that accelerate the electromagnet's driving frequency by 15,000 times per second to the ultrasonic range have been commercialized. However, these toothbrushes are also large in amplitude and strong, which does not solve the disadvantages of electric toothbrushes, and powerful cavitation with 15,000 vibrations per second. It is difficult to expect the effect, so it is difficult to expect the sterilization and cleaning effect by cavitation. In order to solve this problem, ultrasonic toothbrushes using piezoelectric ultrasonic methods have recently been recognized for their high utility in the medical field and have been commercialized. However, the products using the piezoelectric ultrasonic method use a vibration mode of 1.6 MHz in the form of attaching the piezoelectric body generating the ultrasonic vibration to the plastic of the area where the bristles are mounted, and the ultrasonic wave generated from the piezoelectric material is applied to the plastic of the toothbrush. It is attenuated by the ultrasonic wave and hardly generates ultrasonic vibration, and uses only the effect of ultrasonic sound transmission, and the mechanical vibration adopts the vibration motor method, so that the effective ultrasonic vibration energy and cavitation effect cannot be generated using the piezoelectric body. It is a situation that does not solve the disadvantages of the motor system. Therefore, there is a need for a more effective ultrasonic toothbrush that can simultaneously generate ultrasonic vibration and cavitation effects.

Therefore, the present invention is to solve the problems described above and the metal elastic body to amplify and deliver the ultrasonic vibrator and ultrasonic vibration fastened piezoelectric ceramic that can generate ultrasonic waves of 28kHz ~ 50kHz excellent in bacteria disinfection and cleaning effect and By including a drive circuit for generating ultrasonic vibration, it is possible to effectively transmit ultrasonic vibration to the bristles, and the acoustic impedance matching layer for effectively transmitting the ultrasonic vibration between the electrical insulation and the metal elastic body and the bristles, effective and stable ultrasonic toothbrush The purpose is to provide. In addition, it is an object to facilitate the mounting of the bristles to minimize the replacement cost of the bristles.

In order to achieve the above object, the ultrasonic toothbrush using the piezoelectric ultrasonic vibrator of the present invention,

In a toothbrush having a bristle mounting portion,

An ultrasonic vibrator fastening the metal elastic body and the piezoelectric ceramics by amplifying and transmitting the ultrasonic vibration with bolts and having a mode of the following equation;

(λ: wavelength, Fr (λ / 4): resonance frequency, C: sound velocity of metal elastomer, n: odd)

A driving circuit for generating ultrasonic vibrations;

It is configured to include; a rechargeable battery pack for supplying driving power.

The ultrasonic vibrator is an elastic rubber or resin (8) for resilient fitting of the rear metal elastic body 10 of the ultrasonic vibrator to the separator 5 isolating the ultrasonic vibrator and the driving circuit of the toothbrush handle portion, the front metal The boundary between the elastic body and the piezoelectric ceramic is characterized in that it is fitted into the groove (6) of the handle portion by the silicone rubber packing (7) for waterproofing.

In addition, an acoustic impedance matching layer similar to that of the front metal elastic body and the acoustic impedance is formed at the tip of the front metal elastic body of the ultrasonic vibrator, and the inclination angle of the impedance matching layer is zero in consideration of the intensity of the ultrasonic vibration. It can be adjusted at an angle of ~ 45 °, characterized in that the elasticity that can be in close contact with the front metal elastic body and the impedance matching layer when the protruding portion of the bristles are in close contact with the locking groove of one end of the handle.

The metal elastic body,

Anodizing, chromium plating, or titanium (Ti) coating is used to remove oxidation caused by alkaline solution.

According to another embodiment, it further comprises a tartar removing device comprising an impedance matching layer that can be detachably mounted on one side of the toothbrush handle, ultrasonic wave by configuring a water supply pipe on one side of the tartar removing device It is characterized in that the loaded water is sprayed.

On the other hand, in a toothbrush having a bristle mounting portion,

Forming a leaf spring in the groove of the toothbrush handle is characterized in that the locking jaw of the bristles is detachably mounted to maintain a constant fastening force.

In addition, the present invention is made by a special shape of the ultrasonic horn to effectively deliver the ultrasonic oscillation of the piezoceramic.

The piezoelectric body causes contraction and expansion at the frequency of a specific ultrasonic region supplied by the driving circuit, and the contraction and expansion converts electrical energy into ultrasonic energy through a properly designed ultrasonic amplification horn. This ultrasonic wave generates powerful micro vibrations of the bristles more than 40,000 times per second and separates the bond between the bacterial plug and the teeth and gums. In addition, the ultrasonic vibration generated by the toothbrush forms a strong cavitation in the liquid in the mouth to enhance the sterilization and cleaning effect, and the ultrasonic wave formed in the opposite direction of the brush head promotes the treatment of oral inflammation.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the ultrasonic toothbrush using the piezoelectric ultrasonic vibrator according to the present invention.

1 is a cross-sectional view of an ultrasonic toothbrush using a piezoelectric ultrasonic vibrator according to the present invention.

In a toothbrush having a bristle mounting portion,

A metal elastic body for amplifying and transmitting ultrasonic vibrations;

Ultrasonic vibrator with a piezoelectric ceramic bolt;

A driving circuit for generating ultrasonic vibrations;

It is configured to include; a rechargeable battery pack for supplying driving power

As shown in the handle portion 1, the charging battery pack 2 and the driving circuit input terminal are connected and divided into partitions 4 therebetween.

The driving circuit for generating the ultrasonic vibration is connected to the metal electrode ring 11 of the ultrasonic vibrator 20 by two wires 11 'and the ultrasonic vibrator is the rear metal elastic body 10 of the ultrasonic vibrator and the ultrasonic vibrator. Supported by silicon elastic rubber (8) between the separators (5), two ring-shaped piezoelectric ceramics (9) are bolted through a hole in the center of the front metal elastic body (12) and the rear metal elastic body (10) in parallel. It is.

The silicone elastic rubber 8 is preferably a silicone elastic rubber or a resin may be inserted in order to be elastically fitted to the rear metal elastic body 10 of the ultrasonic vibrator, it may be used other materials that can be elastically fitted.

In addition, in order to securely secure the ultrasonic vibrator 20 to the handle portion 1, the locking jaw 18 is installed in the ultrasonic generating horn, and the locking jaw is a silicone rubber packing 7 for waterproofing in the groove 6 of the upper handle. It is fixed by). The handle portion 1 configured as described above is fastened by the bristle portions 16 and 17 and the locking jaw 13 provided with the acoustic impedance matching layer 14 for easy transmission of ultrasonic waves. In addition, the acoustic impedance matching layer 14 is installed at an angle of 0 ~ 45 ° as shown by the reference numeral 15 of Figure 1 can be adjusted so that the optimum ultrasonic vibration is transmitted, the acoustic impedance matching layer is the front metal elastic body for ultrasonic generation 12 Use similar materials with similar acoustic impedance.

Figure 2 is a perspective view of the ultrasonic vibrator of the ultrasonic toothbrush using the piezoelectric ultrasonic vibrator according to the present invention.

The ultrasonic vibrator used in the present invention will be described in detail as follows.

As shown, the front metal elastic body 12 and the rear metal elastic body 10 for effectively transmitting the vibration of the piezoelectric ceramic and the piezoelectric ceramic for the ultrasonic brush according to the present invention, the piezoelectric ceramic The metal electrode ring 11 for connecting the 9 to the driving circuit 3 is sandwiched therebetween, and the front metal elastic body 12, the piezoelectric ceramic 9, the rear metal elastic body 10, and the metal electrode ring 11 are interposed therebetween. ) Is fastened by bolts 19.

3A to 3F are exploded view parts of ultrasonic vibrators of an ultrasonic toothbrush using piezoelectric ultrasonic vibrators according to the present invention.

As shown, Figure 3a is a rear metal elastic body 10, Figure 3b is a metal electrode ring 11,

FIG. 3C shows a piezoelectric ceramic 9, FIG. 3D shows a bolt 19, FIG. 3E shows a polymer insulator tube which prevents the bolt 19 and the piezoelectric ceramic 9 from touching, and FIG. 3F shows a front metal elastic body 12. FIG.

4 is a circuit connection diagram of the ultrasonic vibrator of the ultrasonic toothbrush using the piezoelectric ultrasonic vibrator according to the present invention.

As shown in FIG. 4, the ultrasonic vibrator 20 tightened to 50 to 120 kgf-cm using the torque wrench is connected to the output terminal 41 of the ultrasonic oscillation circuit 40, and the ultrasonic oscillation circuit 40 is It is connected to the DC input terminal 42 of the rechargeable battery pack (2).

5 is a view showing the displacement in the vibration mode of the ultrasonic vibrator of the ultrasonic toothbrush using the piezoelectric ultrasonic vibrator according to the present invention.

6a to 6b are views showing the output current and voltage waveforms of the ultrasonic vibrator of the ultrasonic toothbrush using the piezoelectric ultrasonic vibrator according to the present invention.

The frequency range of 45 kHz selected as an embodiment of the present invention was set in accordance with clinical reports that the frequency transmitted to the surface of the tooth is minimized at 40 kHz or more, and replaced the bristles with a tartar removal device for toothbrushes and tartar removal. Setting value for use. The occurrence displacement of the front metal elastic body 12 is the same as that of a in FIG. 5, and is in the λ / 4 mode. On the other hand, when the length of the rear metal elastic body 10 is the same length as the front metal elastic body 12 with respect to the node point b between the piezoelectric ceramics 9, the generated displacement appears in the amplitude as shown in FIG. In order to increase the generation of ultrasonic waves, since the configuration is generally shorter than the length of the front horn, the actual displacement is reduced as shown in FIG.

In order to find the length of the front metal elastomer when operating at 45kHz, the following equation is used.

(식1)

(Eq. 1)

Where? Is the wavelength, Fr (? / 4) is the resonant frequency in? / 4 mode, and C is the sound velocity of the metal elastomer. For transplantation, Fr (λ / 4) is 45kHz, and C is 60130 d / l, and 5130m / s is substituted, and λ / 4 is 28.5mm in length. Considering the shape factor of the horn experimentally determine the length of the maximum displacement between the length of the front metal elastic body 12 between 28.5mm ~ 35mm. When the designed ultrasonic vibrator 20 is driven by the driving circuit 3 by connecting a 6V battery, the output current and voltage waveform of the ultrasonic vibrator are shown as shown in FIGS. 6A to 6B.

The current was adjusted to 2mA / mv using a Tektronix P6021 AC current probe, resulting in approximately 0.07Arms, output voltage of 150Vrms, and an output of 10.5Watt.

As another embodiment using the vibration mode, a method of designing to directly contact the bristles will be described.

7 is a view showing the displacement in the vibration mode of another embodiment of the ultrasonic vibrator in the ultrasonic toothbrush using the piezoelectric ultrasonic vibrator according to the present invention.

8 is a perspective view showing an ultrasonic vibrator according to another embodiment in an ultrasonic toothbrush using a piezoelectric ultrasonic vibrator according to the present invention.

Fig. 7 shows the length of the horn when the driving frequency of the front metal elastic body 12 is driven in 3λ / 4 mode. In order to find the length of the front metal elastic body 12 when actually operating in 45kHz, 3λ / 4 mode, the following equation is used.

(식2)

(Eq. 2)

In this case, the length of 3λ / 4 becomes 28.5 * 3 = 85.5mm in 45kHz operation, and the maximum displacement length is experimentally determined between 85.5 ~ 98mm for the length of the horn considering the shape effect. At this time, the vibration displacement of the front horn on the basis of the node point (b) is as shown in a of FIG. The shape of the horn produced in this way is shown in FIG.

On the other hand, in order to find the length of the front metal elastic body 12 is generally used the following equation. In other words,

(식3)

(Eq. 3)

Where λ is the wavelength and Fr (λ / 4) is the resonant frequency in λ / 4 mode, C is the sound velocity of the metal elastomer, and n is an odd number of 1,3,5 ...... do.

9 is a perspective view of the bristles mounted in the vibration mode of another embodiment of the ultrasonic vibrator in the ultrasonic toothbrush using the piezoelectric ultrasonic vibrator according to the present invention.

9 is a perspective view showing the ultrasonic vibrator of the mode manufactured as described above mounted on the toothbrush.

As shown, the replacement bristle 16 has an acoustic impedance matching layer 14 installed at an angle of 0 to 45 °, and is configured to fit in the locking groove 17 at the end of the toothbrush handle. The ultrasonic wave shape during driving was indicated by a wave pattern (a) and the cavitation generated in the oral fluid was indicated by a circle (b).

10 is a cross-sectional view of the bristle and the handle portion of the ultrasonic toothbrush using a piezoelectric ultrasonic vibrator according to the present invention.

As shown, the leaf spring 15 is installed in the locking groove 2 of the toothbrush handle 1, the locking jaw 18 of the bristle 16 is fitted, thereby maintaining a constant fastening force.

11 is a cross-sectional view of a tartar removal apparatus showing another embodiment in an ultrasonic toothbrush using a piezoelectric ultrasonic vibrator according to the present invention.

That is, it includes a tartar removal device 30 comprising an acoustic impedance matching layer 14 that can be detachably mounted on one side of the toothbrush handle, and the water supply pipe 35 is formed on one side of the tartar removal device to ultrasonically. Characterized in that the water is sprayed.

As shown, Fig. 11 shows the case where the tartar removal device 30 is attached instead of the bristles. As a device for easily removing tartar visible to the naked eye at home, the tartar removal device 30 is configured in a form including an acoustic impedance matching layer 14, and a water supply pipe 35 is formed at one side of the tartar removal device 30. So that the ultrasonic wave is injected to the end of the tartar removal device 30 and the cavitation contained in the water acts on the tartar so that the plug is decomposed.

In addition, it is also possible to remove the tartar visible in the absence of water by the ultrasonic vibration of the tartar removal device 30.

In addition, the principle of ultrasonic cleaning will be explained by supplying electrons to the amount of hydrogen ions generated by the electrolysis action additionally generated when the ultrasonic vibrator 20 is driven, thereby discharging hydrogen, and hydroxide ions (OH-). By reacting with this water molecule (H2O) it is possible to produce a surfactant called H3O2- "to increase the washing efficiency.

The bristle and ultrasonic vibrator attachment portions are made of synthetic resin containing ore capable of emitting negative ions by external pressure, such as amethyst or tourmaline, and the minerals in these synthetic resins are transmitted to the bristle or vibrator attachment head by vibration of the ultrasonic vibrator. Pressure is applied to increase the generation of negative ions, the metal elastomer is made of stainless steel, aluminum, titanium alloy, duralumin, and the like.

In addition, when the metal elastic body is made of an aluminum-based metal, anodizing, chromium plating, or titanium (Ti) coating should be performed to remove oxidation caused by an alkaline solution.

When the ultrasonic toothbrush is driven, cavitation occurs in the solution of the mouth fluid, the toothpaste and the water in the mouth.

At this time, the inside of the cavitation is a high temperature and high pressure state at a temperature of about 3300K and an air pressure of 313atm, and thus, water molecules and volatiles are thermally decomposed.

In addition, about 4 mM hydroxide ions (HO-) are present in the solution around the cavitation zone, and when the cavitation collapses, a temperature of 1900 K is generated, and non-volatile materials and ionic compounds are oxidized or pyrolysis occurs.

On the other hand, the solution surrounding the bubble is at room temperature and hydrogen peroxide is accumulated. Hydroxide ions present at the interface of the cavitation region react with water molecules to form a surfactant called H3O2- to increase washing efficiency and to change water to weak alkali.

As described above, the cavitation region generated by the ultrasonic waves is widened by the vertical, horizontal, and horizontal movements of the ultrasonic vibrator, thereby maximizing the amount of hydroxide ions. Ultrasonic waves are delivered to the solution through the bristles of the present invention, and strong cavitation occurs, and the generated cavitation is delivered to the gums and every corner of the teeth to sterilize and remove soft plaque and bacteria.

In addition, it is possible to achieve a mechanical brushing effect of removing foreign substances on the tooth surface by the up and down, left and right movements and rotational movement of the bristles more than 40,000 times per second.

The configuration and operation as described above are not limited to the claims of the present invention as an embodiment, and various changes and modifications are possible within the scope of not changing the technical spirit of the present invention. It is obvious to those who are engaged.

According to the ultrasonic toothbrush using the piezoelectric ultrasonic vibrator according to the present invention having the above configuration and action,

Not only can the bristle be replaced more easily, the ultrasonic wave generated from the ultrasonic vibrator is transmitted to the oral cavity through the ultrasonic bristle, and the bristle can be replaced with the tartar removal device, and the cavitation area is increased to increase the teeth and gums. The cleaning and treatment effect can be enhanced.

In addition, the strength of the ultrasonic vibrator may be vaporized to anion the washing water stored in the oral cavity and generate surfactant ions, thereby increasing the washing effect.

Claims (9)

In a toothbrush having a bristle mounting portion, An ultrasonic vibrator fastening the metal elastic body and the piezoelectric ceramics by amplifying and transmitting the ultrasonic vibration with bolts and having a mode of the following equation;

(λ: wavelength, Fr (λ / 4): resonance frequency, C: sound velocity of metal elastomer, n: odd) A driving circuit for generating ultrasonic vibrations; A rechargeable battery pack for supplying driving power; Ultrasonic toothbrush using a piezoelectric ultrasonic vibrator comprising a. The method of claim 1, The ultrasonic vibrator is an elastic rubber or resin (8) for resilient fitting of the rear metal elastic body 10 of the ultrasonic vibrator to the separator 5 isolating the ultrasonic vibrator and the driving circuit of the toothbrush handle portion, the front metal An ultrasonic toothbrush using a piezoelectric ultrasonic vibrator, characterized in that the elastic body and the piezoceramic boundary portion are protruded and fitted into the groove 6 of the handle part by silicone rubber packing 7 for waterproofing purposes. The method of claim 1, An acoustic impedance matching layer similar to that of the front metal elastic body and the acoustic impedance is formed at the tip of the front metal elastic body of the ultrasonic vibrator, and the inclination angle of the acoustic impedance matching layer is 0 to 0 in consideration of the intensity of the ultrasonic vibration. An ultrasonic toothbrush using a piezoelectric ultrasonic vibrator, wherein the elasticity of the front metal elastic body and the acoustic impedance matching layer is maintained when the projection of the bristles is in close contact with the locking groove at one end of the handle. The method of claim 1, The vibration mode of the ultrasonic vibrator An ultrasonic toothbrush using a piezoelectric ultrasonic vibrator, wherein the length of the front metal elastic body is λ / 4 mode. The method of claim 1, The vibration mode of the ultrasonic vibrator An ultrasonic toothbrush using a piezoelectric ultrasonic vibrator, wherein the length of the front metal elastic body is 3λ / 4 mode. The method of claim 1, The metal elastic body, An ultrasonic toothbrush using a piezoelectric ultrasonic vibrator, characterized by anodizing, chromium plating, or titanium (Ti) coating to remove oxidation caused by alkaline solution. The method of claim 1, Ultrasonic toothbrush using a piezoelectric ultrasonic vibrator, characterized in that it further comprises a tartar removal device comprising an acoustic impedance matching layer that can be detachably attached to one side of the toothbrush handle. The method of claim 7, wherein Ultrasonic toothbrush using a piezoelectric ultrasonic vibrator, characterized in that the ultrasonic water is injected by forming a water supply pipe on one side of the tartar removal device. In a toothbrush having a bristle mounting portion, An ultrasonic toothbrush using a piezoelectric ultrasonic vibrator, characterized in that a leaf spring is formed in the groove of one side of the toothbrush handle so that the locking jaw of the bristles is detachably mounted to maintain a constant clamping force.

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