KR20150094316A - A chair-type correction system for posture and attention deficit using three load cell - Google Patents

Abstract

The present invention relates to a chair-type sitting posture and distraction degree correcting system using three load cells and, more specifically, the chair-type sitting posture and distraction degree correcting system using three load cells comprises: three load cells which are attached to an upper unit and a lower unit of a chair; a signal measuring unit which measures weight signals according to changes in weight from the three load cells; a timer which calculates such change in the measured weight signals with time; a control unit which calculates posture information including a posture or a distraction degree of a sitter according to the change in the measured weight signals with time; a signal transmitting unit which converts the posture information of the control unit into a communication signal and transmits the communication signal; and a terminal device which monitors the posture or distraction degree of the sitter on the basis of the posture information transmitted from the signal transmitting unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a chair-type seating posture and a distraction correction system using a load cell,

The present invention relates to a chair-type seating posture and a distraction accuracy calibration system using a 3-load cell, and more particularly, to a system and method for detecting a weight signal in a chair having three load cells and measuring the posture correction and distraction The present invention relates to a chair-type seating posture and a distraction calibration system using a three-load cell.

In recent years, modern people have been suffering from a very busy work, studying and so on, and the time with their chairs has increased with time. As a result, they are exposed to serious diseases such as cardiovascular diseases, diabetes and obesity, If you are exposed to various spinal diseases can be.

In particular, most children should be sitting in a chair for 45 minutes of class time after entering elementary school, and they may experience symptoms of ADHD (ADHD) when they are subjected to various tasks and stressed in a structured school system The child is under severe stress.

Even in adults, the ability to concentrate is deteriorated due to distracting behaviors such as repeated legs and posture changes, but it is very difficult to recognize and correct for themselves.

Therefore, in Korean Patent Registration No. 10-0420947, "Chair for Chiropracticism" or Korean Patent Application Publication No. 10-2009-004145, "Furniture for Chiropractic ", children or adults can sit properly in a chair However, in this invention, it is not easy to recognize and correct the posture and distraction of the seated person by himself / herself.

Korean Registered Patent Publication No. 10-0420947 entitled " Korean Patent Laid-Open Publication No. 10-2009-004145 "Furniture for Chiropractic"

SUMMARY OF THE INVENTION The object of the present invention is to solve the above problems, and it is an object of the present invention to provide a chair-type seating posture and a distraction accuracy correction system using a 3-load cell which can calibrate a posture by a seated person himself using a weight signal of a seated person, .

Another object of the present invention is to provide a method and apparatus for detecting a posture according to a position of the center of gravity of a sitting seated person and determining the posture thereof, measuring the distraction according to the posture change and the movement, A chair-type seating posture and distraction calibration system using a load cell.

Another object of the present invention is to provide a chair-type sitting posture and a distraction chart using a 3-load cell, which enables a sitting person to sit on a chair in a right posture, And to provide a calibration system.

In order to solve the above problems, the chair-type sitting posture and distraction calibration system using the 3-load cell of the present invention includes three load cells attached between an upper unit and a lower unit of a chair and weight signals A timer for calculating a temporal change amount of the measured weight signal and a control unit for calculating posture information including a posture or a distraction degree of a seated person according to a temporal change amount of the measured weight signal, A signal transmitter for converting information into a communication signal and transmitting the communication signal, and a terminal for monitoring the posture or distraction of the seated person with the posture information transmitted from the signal transmitter.

In addition, the signal measuring unit used in the chair-type sitting posture and distraction accuracy calibration system using the 3-load cell of the present invention includes a variable resistor whose resistance value changes in accordance with the weight change and a variable resistor which amplifies a voltage value changed by the variable resistor A preamplifier and a notch filter for removing noise from the amplified voltage value.

In particular, the controller of the chair-type sitting posture and distraction accuracy calibration system using the 3-load cell of the present invention detects the center of gravity of the seated person for seating with the weight signal of the load cell, And calculates a disturbance when a temporal change amount of the weight signal is out of a predetermined range.

The terminal device used in the chair-type seating position and distraction accuracy calibration system using the 3-load cell of the present invention includes an alarm means for transmitting an alarm and a warning message when the value of the degree of disturbance is equal to or greater than a threshold, A PDA, a computer, a notebook computer, a network server, and the like, and is particularly a smart phone equipped with a posture correction application.

As described above, the chair-type sitting posture and the distraction accuracy calibration system using the 3-load cell according to the present invention have the effect of correcting the posture by the seated person himself and measuring the distraction degree.

In addition, the chair-type sitting posture and distraction accuracy correction system using the 3-load cell according to the present invention can continuously monitor the distraction due to the posture change and the movement of the seated person in the terminal device including the smart phone.

In addition, a chair-type sitting posture and a distraction accuracy calibration system using a 3-load cell according to the present invention, a chair-type seating posture and a distraction correction system using a 3-load cell are provided. So that it is possible to improve the performance.

Brief Description of the Drawings Fig. 1 is an overall block diagram of a chair-type sitting posture and distraction accuracy calibration system using a 3-load cell according to the present invention;
2 is a perspective view of a seating type chair using a 3-load cell according to the present invention.
3 is a block diagram of a signal measuring unit included in a chair-type sitting posture and distraction accuracy calibration system using a 3-load cell according to the present invention.
4 is a conceptual diagram for calculating a center of gravity using a weight signal in a chair-type sitting posture and a distraction accuracy calibration system using a 3-load cell according to the present invention.
FIG. 5 is a flow chart of a seating posture correction process in a chair-type sitting posture and a distraction score correcting system using a 3-load cell according to the present invention.
6 is a flow chart of distraction correction of a chair-type sitting posture and distraction accuracy calibration system using a 3-load cell according to the present invention.
FIG. 7 is a diagram showing an initial setting screen of a terminal (smartphone) application of a chair-type sitting posture and distraction accuracy calibration system using a 3-
8 is a screen provided in a smartphone application in a chair-type sitting posture and distraction correction system using a 3-load cell according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The detailed description of known functions and configurations that may unnecessarily obscure the gist of the present invention will be omitted and the same reference numerals will be used for the same configurations regardless of the positions of the drawings.

FIG. 1 is an overall configuration diagram of a chair-type sitting posture and distraction accuracy calibration system using a 3-load cell according to the present invention.

1 according to the present invention, a chair-type sitting posture and a distraction correction system using a 3-load cell according to the present invention is configured to detect a change in weight due to a sitting of a seated person between an upper unit and a lower unit of a seating chair 1 By using three load cells, the seating position of the seated person is detected.

The load cell is a sensor in which the flow of current changes as the voltage changes (V = IR) when the weight of the seated person is changed and the resistance value changes. When each weight is applied to the three load cells, a minute voltage is generated for each load cell.

In this case, it is preferable to provide three load cells so that the sitting posture of the seated person can be measured on the left side, the right side, the front side and the front side and the back side so as to be calibrated to the correct position to the seated person. In some cases, May be measured precisely.

The weight signal detected by the load cell is transmitted to the signal measuring unit 2. The transmitted weight signal is amplified by the preamplifier unit and transmitted to the controller after the noise is removed from the notch filter.

At this time, the signal transmitted to the control unit may be an analog signal or a digital signal.

The configuration of the signal measurement unit 2 and the function of each component will be described later.

In addition, the chair-type sitting posture and distraction accuracy calibration system using the 3-load cell according to the present invention can measure the time variation of the weight signal measured by the signal measuring unit for measuring the scattering degree using the weight signal measured by the signal measuring unit, And a timer (not shown) for performing the calculation.

The control unit 3 calculates posture information including the posture or distraction degree of the seated person using the weight signal measured by the signal measuring unit and the change amount of the weight signal measured through the timer.

The calculated attitude information is converted into a wired or wireless communication signal in the signal transmission unit (not shown) and transmitted to the terminal device 4 which monitors the attitude information.

The terminal device 4 monitors the sitting position and distraction degree of the seated person in real time and generates an audible alarm signal or a visual alarm message to the seated person or the monitoring person when the value of the distraction degree is equal to or more than the threshold, Attitude and distraction induce correction.

The terminal device of the present invention is a device capable of visually or audibly displaying seating positions and distraction figures of a seated person such as a computer, a management server, a notebook computer, a PDA, etc. Especially, as a smartphone is popularized, .

2 is a perspective view of a seat-type chair using a 3-load cell according to the present invention.

The chair 10 used in the chair-type sitting posture and distraction calibration system using the 3-load cell according to the present invention includes an upper unit 20, a lower unit 30, a load cell 40, and a signal measuring unit 50 So that the seated posture and the distraction degree of the user can be measured through the chair which the occupant continuously uses in everyday life.

The chair used in the present invention is a conventional chair having the upper unit 20 and the lower unit 30, and the present invention has a structure in which three load cells 40 are easily installed in the middle of the chair.

The load cell is fixed by a bracket 42 fixed to the upper plate 24 and a bracket 44 coupled to the lower plate 32 so as to be installed in the seating chair and to transmit the load applied to the upper plate to the load cell. Therefore, if the bracket is disengaged, it can be easily removed from the seat.

The upper unit 20 also has a buttock receiving plate 22 formed to enable a seated person to sit thereon and has an upper plate 24 coupled to a lower side of the buttock receiving plate 22. The lower unit 30 has a lower plate 32 positioned to face the upper plate 24 and the lower plate 32 is positioned on the ground so as to be spaced from the upper plate 24. [ The load cell 40 is supported by the lower unit 30 in a spaced space between the upper plate 24 and the lower plate 32 so as to support the upper unit 20 and is transmitted from the upper unit 20 And outputs a signal corresponding to a change in the weight of the seated person.

Further, the signal measuring unit 50 amplifies and filters the signal output from the load cell 40, and transmits the signal to the control unit.

The signal measuring unit 50 is composed of a passive element such as a resistor and an active element such as an amplifier as will be described later. The signal measuring unit 50 is miniaturized according to the development of the technology, and may be integrated with the load cell 40 in some cases.

The chair 3 is constructed in the form of an ordinary chair and a load cell 40 is installed between the upper unit 20 and the lower unit 30 constituting a chair to seat the upper unit 20 To act on the load cell 40 more intensively than in the prior art.

Therefore, the chair 3 using the 3-load cell according to the present invention is composed of a chair, which is a product used in daily life in a home or an office, unlike the prior art. Therefore, a seated person does not need to prepare a separate part, It has the advantage of inducing the correct posture of sitting and calibrating the distraction during daily life without knowing the self.

3 is a configuration diagram of the signal measuring unit 2 included in the chair-type sitting posture and distraction accuracy calibration system using the 3-load cell according to the present invention.

The chair-type sitting posture and distraction accuracy calibration system using the 3-load cell according to the present invention recognizes a weight signal corresponding to a minute weight change from the load cell 40 of a seating chair through the variable resistor 21, A notch filter 23 for removing noise or noise of a specific band from a voltage value output from the preamplifier 22, and a preamplifier 22 for comparing the voltage value with a reference voltage output from the reference resistor 22, A first amplifier 24 for amplifying a signal having passed through the notch filter 23 and a bandpass for passing only a signal of a specific band by removing an offset due to a weight of a seated person in a signal amplified through the first amplifier 24, A second amplifier 26 for amplifying a signal that has passed through the band pass filter 25 and a signal output unit 27 for outputting a weight signal amplified through the second amplifier to the control unit 3, Including It is sex.

The notch filter 23 and the band pass filter 25 may be formed using a passive element such as a resistor R, an inductor L and a capacitor C. However, for the miniaturization and stability of the signal measuring part, .

It is assumed that the signal input from the load cell 40 and output to the signal output unit 27 is analog signal processing. In some cases, however, the signal input from the load cell 40 may be converted into a digital signal by using an analog / It may be outputted to the control unit 3 after digital conversion.

FIG. 4 is a conceptual diagram for calculating the center of gravity and the sitting posture of a seated person using a weight signal in a controller of a chair-type sitting posture and distraction accuracy calibration system using a 3-load cell according to the present invention.

 In order to calculate the attitude information according to the seating position in the control unit, the attitude detection technique is implemented as shown in FIG. 4 in the weight signal detected from the three load cells.

The implemented attitude detection method uses the weight signal detected from each load cell arranged in a triangular shape by using the center of gravity of the triangle.

As shown in Fig. 4 (a), in order to use the weight signal detected by the load cell, the coordinate of each load cell is set to -a on the left side, -b on the right side, and -c on the front side.

The Calibration Point for the calculation of the weight signal is the median of the values of left (-a) and right (b), and the imaginary line (horizontal line) connecting the left and right, the front (-c) (0, 0) at which the virtual line (vertical line) passing through meets vertically.

In order to obtain the weight signal at the right posture and the center of gravity of the seated person, the weight signal is detected while sitting at the first vertical position, and the center of gravity of the triangle is calculated using equation (1) and converted into one coordinate.

  TC (X0, Y0) = {(-a0 + b0 + 0) / 3, (0 + 0-c0) / 3)

In this case, the calibration parameter is set as the distance between the calculation point and the center of gravity which changes with the change of the center of gravity, and the angle between the calculation point and the center of gravity.

That is, by calculating the distance and the angle of the center of gravity, which is an operation parameter, the seating position of the seated person can be grasped.

For example, in FIG. 4B, the weight signal measured on the load cell while the actual seated person is seated is changed from -a0 to -a1 on the left side, b1 to b1 on the right side, and -c1 .

The center of gravity of the seated person is now changed from (X0, Y0) to (X1, Y1) reminiscent of the following equation (2).

TC (X1, Y1) = {(-a1 + b1 + 0) / 3, (0 + 0-c1) / 3)

This allows the sitting position and angle of the occupant to be calculated from the initial center of gravity and the center of gravity which has changed.

In addition, it can be seen that as the center of gravity changed much from the center of gravity of the initial center, the posture of the seated person deviated much from the right posture. Sensitivity is defined as the degree of this deviation, which is used as data to determine the wrong attitude.

That is, the sensitivity (S, Sensitivity)

----(식2)

- (Formula 2)

to be.

The higher the sensitivity value, the greater the deviation from the center of gravity when the center of gravity of the seated person is in the correct posture. If these values exceed a certain threshold, the manager who monitors the posture of the seated or seated person can be alerted So as to have a proper posture.

The angle of the center of gravity is divided into four directions based on 360 °. The posture of the seated person is obtained by the following equation (4).

atan2 (y, x) = posture - (Equation 3)

Also, the controller included in the chair-type sitting posture and distraction accuracy calibration system using the 3-load cell according to the present invention includes a timer for calculating a temporal change amount of the weight signal.

The timer can be formed integrally with the control unit 2 or the signal measuring unit 2 or can be formed independently and measures the duration of the weight signal.

When the weight signal transmitted from each load cell is not detected for a predetermined period of time, it is judged that the seated person has withdrawn from the chair, and a plurality of load cells If the weight signal transmitted from the load cell is weak for a certain period of time, the seated person is seated halfway. If the weight signal continuously appears for a certain period of time in only a specific load cell among the three load cells, it means that the seated person is leaning to one side. If the weight signal in the load cell fluctuates more than a certain value, it means that the seated person is not sitting properly and is moving in the chair continuously.

Therefore, if the weight signal of the load cell is changed by more than a predetermined threshold value, the number of events detected during a certain period of time can be used as the value of the scattering degree.

The predetermined time can be arbitrarily set by the seated person or the monitoring person, and it is preferably set in units of 10 minutes or 30 minutes in consideration of the concentration of the seated person.

That is, the attitude deficit level

(Event occurrence number ÷ constant seating time) = distraction degree (number of times) -------------- (Equation 4)

.

Also, when the time for maintaining the wrong posture is prolonged, it means that the seated person does not maintain the correct posture or has a wrong sitting habit. Therefore, it is necessary to inform the manager who monitors the seated person or the seated person desirable.

That is, the posture correction requirement rate

(Incorrect posture holding time ÷ constant seating time) × 100 = posture correction request rate (%) ------- (Equation 5)

.

In addition, when the weight signal transmitted from each load cell is not detected for a predetermined period of time and it is determined that the occupant has withdrawn from the chair, the timer causes the signal measuring unit or the control unit to operate in the sleep mode, It is preferable to arrange that the system according to the present invention can be operated for a long time with low power by stopping the operation of the signal transmission unit for converting and transmitting the communication signal.

On the other hand, the control unit calculates the equations (1) to (5) with the temporal change amount of the weight signal measured by the timer and transmits it to the seated person or the terminal device of the manager.

FIG. 5 is a flow chart for calculating or executing a sitting posture correction of a seated person in a control unit in a chair-type sitting posture and distraction accuracy calibration system using a 3-load cell according to the present invention.

First, when a seated person sits on a chair with a 3-load cell according to the present invention (S1), a weight signal is detected in each load cell and a weight signal is measured in the signal measuring unit using a resistance value or a voltage value changed in the signal measuring unit And outputs a signal to the control unit, and the control unit receives the signal output from the signal measurement unit. (S2)

The control unit obtains the center of gravity from the weight signal of the detected 3-load cell (S3), and converts the center of gravity into 2-dimensional coordinates (S4).

At this time, the controller determines whether the reference value of the center of gravity is stored (S5).

That is, when the reference value of the center of gravity is not stored and the converted coordinate value indicates the first correct posture of the seated person, the coordinate value at this time is set as the reference center of gravity (S6) If it does not mean the right posture, the distance and angle between the reference center of gravity and the center of gravity based on the measured coordinate value (posture) are calculated (S7), and based on the measured time, And calculates the distraction and posture correction demand ratio using Equation 4 and Equation 5. (S8)

In step S9, it is determined whether the computed distractibility or the posture correction request rate is out of a predetermined threshold value. If either one or both of them exceed the threshold value, the user is warned in real time or alarmed. )

FIG. 6 is a flowchart illustrating a method for calibrating distractibility in a chair-type sitting posture and distraction accuracy calibration system using a 3-load cell according to the present invention in more detail.

It is desirable to warn the seated person or manager by stepping the distraction level (L1 <L2 <L3) so that the warning level may vary according to the degree of distraction. do.

First, when a weight signal is transmitted to the control unit (R1), the distraction degree is calculated (R2) according to Equation 4 and Equation 5, and when the distraction or posture correction requirement ratio is equal to or higher than a certain level (L3) If the number of distractions is 10, and the posture correction request rate is 80% or more, an alarm and a warning message are immediately transmitted to the user (R4).

(R5), for example, when the number of distractions is 5 to 9 times and the posture correction request rate is 30 to 79%, it is necessary to immediately pay attention to the seated person or the manager (R6) to send a message or send a warning alarm at regular intervals to allow the seated person or manager to use it as a reference for posture correction and distraction correction (R6)

If the distraction rate or the posture correction requirement rate is low (L1) (R7), for example, if the number of distractions is four or less and the posture correction rate is less than 30%, diagnosis is made normal.

Depending on the level of distractibility, you can adjust the volume of the alarm for different audible alarms, or if necessary.

It is desirable that all of the diagnosed result, warning message, and caution message are transmitted to the user or stored in the data logger (R8) so that the distraction can be utilized as the data for diagnosis or correction (R9).

A signal from the control unit 3 to the terminal device 4 can be transmitted by wire or wireless. For this purpose, the signal transmission unit converts posture information calculated by the control unit into a communication signal.

The wire transmission method can use a wired cable or an optical cable. The wireless transmission method is wireless (wireless) such as Bluetooth, WiFi, ZigBee, Z-wave or NFC Network can be used.

Bluetooth can be connected to a device with a radius of 10m, a WiFi radius of 50m, a Zigbee with a radius of 10m, a Jigwave with a radius of 30m and an NFC with a radius of 10m. Is preferable in terms of the use range and the user enlargement.

7 is an initial setting screen of a terminal device application of a chair-type sitting posture and distraction accuracy calibration system using a 3-load cell according to the present invention.

 The posture application implemented in the terminal device 4 according to the embodiment of the present invention, in particular, a smartphone, can be displayed on the display of the sitting posture measurement screen of the initial seated person as shown in FIG. 7A and the environment setting screen as shown in FIG. .

7 (a) shows a procedure for setting a standard of a correct posture for improving the correct posture and concentration, in which a right posture is requested to a seated person and a weight signal is measured in the load cell by pressing the start button.

When the measurement is started, it is preferable that the sitting posture of the seated person is expressed in a virtual 3D so as to intuitively assist the correction.

FIG. 7B is an area for setting an alarm setting for a degree of distraction and a posture correction request rate, how to set a certain time, an alarm as sound, or vibration as a setting part .

When a bad posture is detected, the terminal device 4 according to the embodiment of the present invention notifies the user of various informing methods such as vibration, alarm sound and pop-up message according to the environment setting predetermined by the seated person or the administrator .

8 is an example of a screen actually provided in a smartphone application in a chair-type sitting posture and distraction correction system using a 3-load cell according to the present invention.

As shown in FIG. 8 (a), the personal information of the seated person or the face image is displayed, thereby allowing the seated person to know who is seated.

In addition, when a user or a seated person is designated through such a configuration, one seating device may be used to monitor seating positions and distractions of the seated persons.

As shown in FIG. 8 (b), the smartphone displays a posture according to the change in the center of gravity of the seated person and the angle, and the weight and distraction of the seated person are also shown in the posture The calibration request rate, the seating time, and the like through the display means. The graph shows how the weight signal of the load cell changes as shown in FIG. 8 (d).

Table 1 below shows the results of 20 experiments performed for each of the five subjects in order to evaluate the performance of the present invention for the measurement of the posture correction and the distraction measurement. .

Performance evaluation results of seating position and distraction calibration system division center Left Right front rear accuracy(%) center 92 8 92 Left 100 100 Right 100 100 front 100 100 rear 8 92 92 Average 96.8

As described above, the chair-type sitting posture and distraction correction system using the 3-load cell according to the present invention corrects the posture of the seated person himself, continuously transmits the distraction due to the posture change of the seated person and the movement, Thereby inducing a correct posture and improving concentration.

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 appended claims. It will be obvious to those skilled in the art, and the scope of protection of the present invention is interpreted by the claims.

1: Seating chair
10: sitting chair, 20: upper unit, 30: lower unit, 40: load cell
24: upper plate, 32: lower plate, 42, 44: bracket, 50: signal measuring unit
2. Signal measurement section
21: variable resistor, 22: preamplifier, 23: notch filter, 24: first amplifier
25: band pass filter, 26: second amplifier (26) 27: signal output section
3. Control section
4. Terminal (Monitoring)

Claims (5)

Three load cells attached between the upper unit and the lower unit of the chair;
A signal measuring unit for measuring a weight signal according to a change in weight from the three load cells;
A timer for calculating a temporal change amount of the measured weight signal;
A control unit for calculating attitude information including a posture or a distraction degree of a seated person according to a temporal change amount of the measured weight signal;
A signal transmission unit for converting attitude information of the control unit into a communication signal and transmitting the communication signal; And
And a terminal device for monitoring the posture or distraction degree of the seated person with the posture information transmitted from the signal transmission unit
3-chair-type sitting posture and distraction calibration system using load cell.
The method according to claim 1,
Wherein the signal measuring unit includes: a variable resistor whose resistance value changes in accordance with weight change;
A preamplifier for amplifying a voltage value changed by the variable resistor;
And a notch filter for removing noise from the amplified voltage value
3-chair-type sitting posture and distraction calibration system using load cell.
The method according to claim 1,
Wherein the control unit detects a center of gravity of the seated person for seating with a weight signal of the load cell, calculates a sitting posture of the seated person according to the change of the center of gravity,
And a case where the temporal change amount of the weight signal is out of a certain range is calculated as a distraction.
3-chair-type sitting posture and distraction calibration system using load cell.
The method according to claim 1,
Wherein the terminal device comprises an alarm means for transmitting an alarm and a warning message when the value of the distractibility is equal to or greater than a threshold value
3-chair-type sitting posture and distraction calibration system using load cell.
5. The method of claim 4,
Wherein the terminal device is a smart phone equipped with a posture correction application
3-chair-type sitting posture and distraction calibration system using load cell.

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