KR101977676B1 - Apparatus of Supplying Water for Dental Unit Chair and Method of Supplying Water for Dental Unit Chair - Google Patents

Abstract

According to embodiments of the present invention, the present invention relates to a water supply apparatus for a unit chair, and a method thereof. According to the present invention, after a cup is placed on a support unit, a first ultrasonic signal can be transceived toward an upper edge of the cup by using a first transceiving unit provided in a water supply unit and a second ultrasonic signal can be transceived toward the inside of the cup by using a second transceiving unit provided in the water supply unit. In addition, when a gap between the support unit and the water supply unit is defined as a first height, and a gap between the frist transceiving unit and the upper edge of the cup which can be measured by the first ultrasonic signal is defined as a second height, a value obtained by subtracting the second height from the first height can be measured as the height of the cup. When a gap between the second transceiving unit and the inside of the cup which can be measured by the second ultrasonic signal is defined as a third height, a value obtained by subtracting the third height from the first height can be measured as the height of water supplied to the cup. Thereafter, when the heights of the cup and the water are received, and it is confirmed that the height of the water is in a predetermined ratio or less to that of the cup, the water can be supplied to the cup, and the supply of the water to the cup can be stopped when it is confirmed that the height of the water is in a predetermined ratio or more to that of the cup.

Description

Technical Field [0001] The present invention relates to a water supply device for a unit chair and a water supply method for a unit chair,

The present invention relates to a water supply device for a unit chair and a water supply method for a unit chair. More particularly, to a water supply device for a unit chair and a water supply method for a unit chair for supplying water to a patient during a dental treatment.

In dentistry, water is supplied to the patient after the treatment, thereby allowing the user to wash the saliva, blood, and foreign substances in the oral cavity of the patient.

A water supply device for a unit chair for supplying water to a patient used in a dentistry may be provided to have a structure for automatically supplying water to the cup when the cup is placed on the water supply table.

In the water supply device for a unit chair, the recognition of the cup placed at the water supply can be achieved by using a member for transmitting and receiving an infrared signal toward the side of the cup, and confirmation of the amount of water supplied to the cup is supplied to the cup By providing current to the water to sense the amount of change in current.
A technique of recognizing a cup using an infrared signal is disclosed in a Utility Model Registration No. 20-0391600, and a technique for confirming the amount of water supplied to the cup by the amount of change in current is disclosed in, for example, Japanese Unexamined Patent Application Publication No. 10-2014-0006354 have.

However, in order to recognize the cup, transmitting and receiving an infrared signal to the side of the cup may vary the detection range depending on the material of the cup or the size of the cup, and in some cases, the cup may not be recognized.

Also, providing current to the water to check the amount of water supplied to the cup can change the amount of current when the component of the water is changed, so that the amount of water supplied to the cup can not be accurately ascertained.

An object of the present invention is to provide a water supply device for a unit chair capable of accurately recognizing a cup regardless of the material and size of the cup placed in the water supply line and accurately checking the amount of water supplied to the cup.

It is another object of the present invention to provide a water supply method for a unit chair that accurately recognizes a cup regardless of the material and size of the cup placed in the water supply bowl and accurately confirms the amount of water supplied to the cup.

According to an aspect of the present invention, there is provided a water supply device for a unit chair comprising a support part, a water supply part, a first transmission / reception part, a second transmission / reception part, a cup height measurement part, . ≪ / RTI > The receiving portion may be provided so that the cup is placed thereon. The water supply unit may be positioned above the receiving unit to supply water to the cup. The first transceiver may be provided in the water supply unit to transmit and receive the first ultrasonic signal toward the upper edge of the cup placed on the receiving unit. The second transceiver may be provided in the water supply unit to transmit and receive a second ultrasonic signal toward the inside of the cup placed on the receiving unit. The cup height measuring unit defines a first height between the receiving unit and the water feed unit and defines a second height between the first transceiver unit and the upper frame of the cup which can be measured by the first ultrasonic signal The height of the cup may be measured by subtracting the second height from the first height. Wherein the water height measuring unit calculates a value obtained by subtracting the third height from the first height when defining the third height between the second transceiver unit and the inside of the cup that can be measured by the second ultrasonic signal And measuring the height of the water supplied to the cup. Wherein the control unit supplies water to the cup when the height of the water is equal to or less than a predetermined ratio to the height of the cup by receiving the height of the cup and the height of the water, And stopping the supply of water to the cup when the height is confirmed.

In exemplary embodiments, when the first transceiver is configured to transmit and receive a first ultrasonic signal at an angle of &thetas; toward the upper rim of the cup, the cup height measuring unit calculates a height of the cup by Measurement.

≪ EMI ID = 1.0 > [0033] The first height - (second height x sin &

In exemplary embodiments, when the second transceiver is configured to transmit and receive a second ultrasonic signal at an angle of &thetas; toward the inside of the cup, the water height measuring unit measures the height of the water by the following equation .

&Quot; (2) " First height - (third height x sin &thetas;)

In exemplary embodiments, the receiving portion may be provided with a receiving portion for receiving the cup when the cup is placed.

According to another aspect of the present invention, there is provided a method of supplying water to a unit chair, comprising: placing a cup on a receiving portion; and then, using a first transmitting / receiving portion provided in the water supplying portion, 1 ultrasonic signals and transmit and receive a second ultrasonic signal toward the inside of the cup using a second transceiver provided in the water supply unit. And defining a second height between the first transducer and the upper edge of the cup that can be measured by the first ultrasonic signal, A value obtained by subtracting the second height from the first height can be measured as the height of the cup, and a distance between the second transceiver and the inside of the cup, which can be measured by the second ultrasonic signal, A value obtained by subtracting the third height from the first height may be measured as the height of water supplied to the cup. If the height of the water is equal to or less than a certain height of the height of the cup by receiving the height of the cup and the height of the water, water can be supplied to the cup, When the height is confirmed, the supply of water to the cup can be stopped.

In exemplary embodiments, when the first transceiver is configured to transmit and receive a first ultrasonic signal at an angle of &thetas; toward the upper rim of the cup, the height of the cup may be measured according to the following equation.

≪ EMI ID = 1.0 > [0033] The first height - (second height x sin &

In exemplary embodiments, when the second transceiver is configured to transmit and receive a second ultrasonic signal at an angle of? To the inside of the cup, the height of the water can be measured by the following equation (2).

&Quot; (2) " First height - (third height x sin &thetas;)

In the water supply device for a unit chair and the water supply method for a unit chair according to the exemplary embodiments, since the ultrasonic signal can be transmitted and received by using the first transceiver, the cup is accurately recognized regardless of the material of the cup or the size of the cup You can do it.

The water supply device for the unit chair and the water supply method for the unit chair according to the exemplary embodiments can accurately calculate the height of the cup placed on the water supply table and the height of the water supplied to the cup, You will be able to accurately determine the amount of water.

Therefore, the water supply device for the unit chair and the water supply method for the unit chair according to the exemplary embodiments will be able to supply the desired amount of water accurately to the cup placed on the water supply table.

However, the effects of the present invention are not limited to the above-mentioned effects, and may be variously expanded without departing from the spirit and scope of the present invention.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view schematically showing the entire water supply device for a unit chair according to exemplary embodiments. FIG.
2 is a view of a water supply assembly in a water supply device for a unit chair according to exemplary embodiments.
3 is a process diagram for explaining a water supply method for a unit chair according to exemplary embodiments.

For the embodiments of the invention disclosed herein, specific structural and functional descriptions are set forth for the purpose of describing an embodiment of the invention only, and it is to be understood that the embodiments of the invention may be practiced in various forms, The present invention should not be construed as limited to the embodiments described in Figs.

The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms may be used for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprise", "having", and the like are intended to specify the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, , Steps, operations, components, parts, or combinations thereof, as a matter of principle.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be construed as meaning consistent with meaning in the context of the relevant art and are not to be construed as ideal or overly formal in meaning unless expressly defined in the present application .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view schematically showing the entire water supply device for a unit chair according to exemplary embodiments. FIG.

Referring to FIG. 1, a water supply device 100 for a unit chair according to exemplary embodiments is provided to supply water to a patient so as to wash saliva, blood, foreign substances, etc., . That is, the patient can be provided with water to be able to rinse the oral cavity during dental treatment.

In addition, the water supply device 100 for a unit chair according to exemplary embodiments may include a water supply assembly for supplying water to a patient, a spittoon assembly or the like capable of spitting saliva, blood, or oral cavity .

Accordingly, the water supply device 100 for a unit chair according to exemplary embodiments includes a support portion 11 in which a cup in which water for supplying to a patient is placed, as a water supply assembly, a water supply portion 13 for supplying water to the cup, The spittoon assembly 15 can be used to spit saliva, blood, or oral cavity, and saliva, blood, or oral cavity spit to the spittoon 15 can be cleanly drained and cleaned And a spitun washer 17 for supplying water to the spittoon 15 so that the water can be supplied.

Further, the water supply device 100 for a unit chair according to the exemplary embodiments may be provided so as to be disposed mainly near a patient chair.

The water supply device 100 for a unit chair according to exemplary embodiments will be described with respect to a water supply assembly.

2 is a view of a water supply assembly in a water supply device for a unit chair according to exemplary embodiments.

2, the water supply device 100 for a unit chair according to exemplary embodiments may include the aforementioned receiving portion 11 and the water supply portion 13. [

The receiving portion 11 is a portion where the cup 10 is placed. The water supply part 13 is a part for supplying water to the cup 10 placed on the receiving part 11. [ The water supply unit 13 may be disposed on the upper portion of the receiving unit 11 and may include a water supply port 24 to supply water to the cup 10.

Therefore, when the cup 10 is placed on the receiving portion 11, water can be supplied to the cup 10 through the water inlet 24 of the water supplying portion 13 disposed on the receiving portion 11.

In the case of using the water supply device 100 for a unit chair according to the exemplary embodiments, when water is supplied while the cup 10 is not placed on the receiving part 11, or when the cup 10 ) May be seriously disturbed by dental care using a unit chair.

Accordingly, the water supply device 100 for a unit chair according to the exemplary embodiments must be controlled to correctly supply water to the cup 10 after correctly recognizing that the cup 10 is placed on the receiving portion 11, So that the water does not overflow into the cup 10 lying on the part 11.

Therefore, the water supply device 100 for a unit chair according to the exemplary embodiments correctly recognizes when the cup 10 is placed on the receiving portion 11, and then, when the water is overflowed into the cup 10 placed on the receiving portion 11 The first transceiver 21, the second transceiver 22, the cup height measuring unit 26, the water height measuring unit 27, the controller 28, and the like.

The first transceiver 21 may be configured to transmit and receive a first ultrasonic signal toward the upper edge of the cup 10 placed on the receiving unit 11. [ Therefore, the first transceiver 21 may be provided on the side of the water supply unit 13 where the upper edge of the cup 10 can be seen.

The second transceiver 22 may be configured to transmit and receive a second ultrasonic signal toward the inside of the cup 10 placed on the receiving unit 11. [ Thus, the second transceiver 22 may be provided on the side of the water supply unit 13 that can see the inside of the cup 10.

The cup height measuring unit 26 may be provided to measure the height of the cup 10 by receiving the first ultrasonic signal from the first transceiver 21. The cup height measuring section 26 defines the first height between the receiving section 11 and the water supplying section 13 and the first transmitting and receiving section 21 and the cup 10 which can be measured by the first ultrasonic signal, The height of the cup 10 can be measured by subtracting the second height from the first height when the height between the upper edges of the cup 10 is defined as the second height. Thus, the cup height measuring unit 26 can be formed of an IC chip in which a program capable of being operated is embedded.

The first transceiver 21 and the water feeder 13 for defining the first height and the second height are located at the same position as the first transceiver 21 and the water feeder 13, Can be defined.

The water supply device 100 for a unit chair according to the exemplary embodiments is characterized in that when the height of the cup 10 is measured by the first transceiver 21 and the cup height measuring unit 26, It can be recognized that it is placed on the base 11. That is, if the first height and the second height are the same, it is recognized that the cup 10 is not placed on the receiving portion 11. If the second height is lower than the first height, (10) is placed.

The water supply device 100 for a unit chair according to the exemplary embodiments may further include a receiving portion 29 capable of receiving the cup 10 when the cup 10 is placed on the receiving portion 11 have. That is, the accommodating portion 29 can be provided so that the cup 10 is placed at the correct position.

Particularly, the water supply device 100 for a unit chair according to the exemplary embodiments may be provided to recognize that the cup 10 is placed on the receiving portion 11 by the receiving portion 29 as well.

The first transceiver 21 may be provided to transmit and receive the first ultrasonic signal toward the upper edge of the cup 10 in a state inclined at the angle of? In other words, the first transceiver 21 may be configured to transmit and receive the first ultrasonic signal at an angle of θ toward the upper edge of the cup 10.

Accordingly, the cup height measuring unit 26 may be provided to measure the height of the cup 10 by the following equation (1).

≪ EMI ID = 1.0 > [0033] The first height - (second height x sin &

In addition, the first transceiver 21 may be configured to transmit and receive the first ultrasonic signal toward the upper edge of the cup 10 in the vertical direction instead of being tilted at an angle different from that shown in Fig. 2 . In this case, since the angle at which the first ultrasonic signal is transmitted and received is sin90 degrees, a value obtained by subtracting the second height from the first height may be measured as the height of the cup 10 in the above-mentioned Equation (1).

Therefore, when the first transceiver 21 can transmit and receive the first ultrasonic wave toward the rim of the cup 10, the first transceiver 21 will not be restricted by the position of the water transceiver 13.

The water height measuring unit 27 may be provided to measure the height of water supplied to the cup 10 by receiving the second ultrasonic signal from the second transceiver 22. The water height measuring unit 27 defines the first height between the receiving unit 11 and the water supplying unit 13 and the second transmitting and receiving unit 22 and the cup 10 which can be measured by the second ultrasonic signal. It is possible to measure a value obtained by subtracting the third height from the first height as the height of the water. Therefore, the water height measuring unit 27 can also be formed of an IC chip in which a program capable of being operated in the same manner as the cup height measuring unit 26 is embedded.

The second transceiver 22 and the water feeder 13 for defining the first height and the third height are disposed at the same position as the second transceiver 22 and the second transceiver 22 are disposed in the water supply unit 13 Can be defined.

2, the second transceiver 22 may also be configured to transmit and receive a second ultrasonic signal toward the inside of the cup 10 in a state tilted at an angle of θ. That is, the second transceiver 22 may be configured to transmit and receive a second ultrasonic signal at an angle of?

Accordingly, the water height measuring unit 27 may be provided to measure the height of water supplied to the cup 10 by the following equation (2).

&Quot; (2) " First height - (third height x sin &thetas;)

2, the second transceiver 22 may be configured to transmit and receive a second ultrasonic signal toward the inside of the cup 10 in a vertical direction instead of being inclined at an angle of?. In this case, since the angle at which the second ultrasonic signal is transmitted and received is sin90 degrees, a value obtained by subtracting the third height from the first height is substituted by the height of the water supplied into the cup 10 .

Therefore, when the second transceiver 22 can transmit and receive the second ultrasonic waves toward the inside of the cup 10 in which the water is supplied, the second transceiver 22 will not be restricted by the position of the water supply unit 13.

The control unit 28 may be provided to receive the height of the cup 10 and the height of the water. That is, the control unit 28 may be connected to receive signals from the cup height measuring unit 26 and the water height measuring unit 27, respectively. In the case of the control unit 28, an IC chip having a controllable program to be described later may be incorporated.

Particularly, the control unit 28 can be provided to recognize that the cup 10 is placed on the receiving unit 11 by being provided with the height of the cup 10, and also to provide the height of the cup 10 and the height of the water To control the supply state of the water to the cup (10) placed on the receiving portion (11).

That is, the control unit 28 can control the water supply unit 13 to continuously supply water to the cup 10 when the height of the water is equal to or less than a certain height relative to the height of the cup 10, It is possible to control the water supply unit 13 so as to stop the supply of water to the cup 10 when the height of the water is determined to be equal to or higher than a certain level.

For example, if it is ascertained that the height of the water is about 90% or less based on the height of the cup 10, water is continuously supplied to the cup 10, and the height of the water is about 90% The supply of water to the cup 10 is stopped.

The water supply device 100 for a unit chair according to the exemplary embodiments can accurately calculate the height of the cup 10 placed in the water supply portion 13 and the height of the water supplied to the cup 10, The cup 10 can be accurately recognized regardless of the size of the material or the cup 10 and the amount of water supplied to the cup 10 can be accurately confirmed even if the composition of the water supplied to the cup 10 is changed.

Therefore, the water supply device 100 for a unit chair according to the exemplary embodiments will be capable of accurately supplying water to the cup 10 placed in the water supply portion 13 in a desired amount.

Hereinafter, a water supply method for a unit chair according to exemplary embodiments will be described.

3 is a process diagram for explaining a water supply method for a unit chair according to exemplary embodiments.

3, the cup 10 is placed on the receiving part 11 (step S31). Then, the first transmitting and receiving part 21 is used to transmit and receive the first ultrasonic signal toward the upper edge of the cup 10 And the second ultrasonic signal is transmitted / received toward the inside of the cup 10 by using the second transceiver 22. (Steps S33 and S35)

The transmission and reception of the first ultrasonic signal and the transmission and reception of the second ultrasonic signal may be continuously performed even when the cup 10 is not placed on the receiving portion 11. [

The cup 10 placed on the receiving portion 11 may be received in the receiving portion 29 provided in the receiving portion 11. [

The height of the cup 10 is measured using the cup height measuring section 26 in step S37. The cup height measuring section 26 measures the height of the cup 10 between the receiving section 11 and the water supplying section 13, And defining a second height between an upper edge of the cup 10 and the first transceiver 21 that can be measured by the first ultrasonic signal, a value obtained by subtracting the second height from the first height The height of the cup 10 can be measured.

Particularly, when the first transceiver 21 is provided to transmit and receive the first ultrasonic signal at an angle of? Toward the upper edge of the cup 10, the cup height measuring unit 26 measures the cup 10 Can be measured.

≪ EMI ID = 1.0 > [0033] The first height - (second height x sin &

Alternatively, when the first transceiver 21 is configured to transmit and receive the first ultrasonic signal toward the upper edge of the cup 10 in the vertical direction instead of being inclined at the angle of?, The angle at which the first ultrasonic signal is transmitted and received The value obtained by subtracting the second height from the first height may be measured as the height of the cup 10. In this case,

In addition, when the height of the cup 10 is measured, the control portion 28 will be able to recognize that the cup 10 is placed on the receiving portion 11, and thus control the supply of water to the cup 10 There will be. On the contrary, it is possible to recognize that the cup 10 is placed on the receiving portion 11 by the receiving portion 29 mentioned above, so that the supply of water to the cup 10 can be controlled.

The height of the water is measured using the water height measuring unit 27. (Step S39) The water height measuring unit 27 defines the first height between the receiving unit 11 and the water supplying unit 13, When defining the third height between the second transceiver 22 and the inside of the cup 10 that can be measured by the second ultrasonic signal, a value obtained by subtracting the third height from the first height is defined as the cup 10 It can be measured by the height of the supplied water.

Particularly, when the second transceiver 22 is provided to transmit and receive the second ultrasonic signal at an angle of? To the inside of the cup 10, the water height measuring unit 27 calculates the water level of the cup 10, It is possible to measure the height of the water supplied to the water tank.

&Quot; (2) " First height - (third height x sin &thetas;)

Alternatively, when the second transceiver 22 is configured to transmit and receive a second ultrasonic signal in a vertical direction, rather than in a tilted state at an angle of?, The angle at which the second ultrasonic signal is transmitted and received is sin 90 degrees The value obtained by subtracting the third height from the first height may be measured as the height of the water supplied into the cup 10.

The control unit 28 can control the amount of water supplied to the cup 10 by receiving the height of the cup 10 and the height of the water from the cup height measuring unit 26 and the water height measuring unit 27. [

The control unit 28 controls the water supply unit 13 so that the water is continuously supplied to the cup 10 when the height of the water is equal to or less than a certain height relative to the height of the cup 10. In step S41, Controls the water supply unit 13 so as to stop the supply of water to the cup 10 when the height of the water is higher than a certain level relative to the height of the cup 10. In step S43,

As described above, since the water supply method for the unit chair according to the exemplary embodiments can accurately calculate the height of the cup 10 placed in the water supply part 13 and the height of the water supplied to the cup 10, The cup 10 can be accurately recognized regardless of the size of the material or the cup 10 and the amount of water supplied to the cup 10 can be accurately confirmed even if the composition of the water supplied to the cup 10 is changed.

Therefore, the water supply method for the unit chair according to the exemplary embodiments will be able to supply water to the cup 10 lying in the water supply portion 13 accurately in a desired amount.

A water supply device for a unit chair and a water supply method for a unit chair according to exemplary embodiments can be applied to a unit chair, and in particular, water can be supplied to a patient so as to wash saliva, blood, It can be applied to a dental unit chair that can be supplied.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims. It can be understood that it is possible.

10: cup 11:
13: Water supply unit 15: Spittoon
17: Spin-clean unit 21: First transmission and reception unit
22: second transmission / reception unit 24: water supply port
26: Cup height measuring part
27: Water height measuring part
28: control unit 29:
100: Water supply device

Claims (7)

A water supply device for a unit chair for supplying water to a patient at the time of a dental treatment, the water supply device comprising: a support part on which the cup is placed; and a water supply part located above the support part and supplying water to the cup,
A first transceiver provided in the water supply unit to transmit and receive a first ultrasonic signal toward an upper edge of the cup placed on the receiving unit;
A second transceiver provided in the water supply unit to transmit and receive a second ultrasonic signal toward the inside of the cup placed on the receiving unit;
And a second height is defined between the first transducer and the upper edge of the cup which can be measured by the first ultrasonic signal, A cup height measuring unit for measuring a value obtained by subtracting the second height from the first height by the height of the cup;
Wherein when a third height between the second transceiver and the inside of the cup, which can be measured by the second ultrasonic signal, is defined as a third height, a value obtained by subtracting the third height from the first height is supplied to the cup A water height measuring unit for measuring water height; And
Receiving portion receives the height of the cup from the first transceiver and recognizes that the cup is placed on the receiving portion and receives the height of the cup and the height of the water from the first transceiver and the second transceiver The water is supplied to the cup when the height of the water is equal to or less than the height of the cup and the supply of water to the cup is stopped when the height of the water is more than a certain level of the height of the cup And a control unit provided to the water supply unit. The method according to claim 1,
Wherein when the first transceiver is configured to transmit and receive a first ultrasonic signal at an angle of? Toward the upper edge of the cup, the cup height measuring unit measures the height of the cup according to Equation (1) Water supply device.
≪ EMI ID = 1.0 > [0033] The first height - (second height x sin & The method according to claim 1,
Wherein when the second transceiver is configured to transmit and receive a second ultrasonic signal at an angle of? Toward the inside of the cup, the water height measuring unit measures the height of the water by the following equation (2) Device.
&Quot; (2) " First height - (third height x sin &thetas;) The method according to claim 1,
Wherein the receiving portion is provided with a receiving portion for receiving the cup when the cup is placed. A water supply method for a unit chair for supplying water to a patient at the time of dental treatment, the water supply method comprising: a receiving part for receiving the cup; and a water supplying part for supplying water to the cup,
Placing a cup on the pedestal;
Transmitting and receiving a first ultrasonic signal toward an upper edge of the cup using a first transceiver provided in the water supply unit;
Transmitting and receiving a second ultrasonic signal toward the inside of the cup using a second transceiver provided in the water supply unit;
And a second height is defined between the first transducer and the upper edge of the cup which can be measured by the first ultrasonic signal, Measuring a height of the cup by subtracting the second height from a height of the cup;
Wherein when a third height between the second transceiver and the inside of the cup, which can be measured by the second ultrasonic signal, is defined as a third height, a value obtained by subtracting the third height from the first height is supplied to the cup Measuring the height of the water; And
When the height of the water is determined to be less than a certain percentage of the height of the cup by receiving the height of the cup and the height of the water by recognizing that the cup is placed on the receiving part by receiving the height of the cup, Supplying water to the cup, and stopping the supply of water to the cup when the height of the water is determined to be equal to or higher than a predetermined ratio to the height of the cup. 6. The method of claim 5,
Wherein the height of the cup is measured by the following equation (1) when the first transceiver is configured to transmit and receive the first ultrasonic signal at an angle of &thetas; toward the upper rim of the cup.
≪ EMI ID = 1.0 > [0033] The first height - (second height x sin & 6. The method of claim 5,
Wherein when the second transceiver is configured to transmit and receive a second ultrasonic signal at an angle of? Toward the inside of the cup, the height of the water is measured by the following equation (2).
&Quot; (2) " First height - (third height x sin &thetas;)

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