KR101181506B1 - Apparatus for measuring partial fat of body and method thereof - Google Patents

Abstract

The present invention provides a light source for irradiating light to a body measurement part, a light detector for detecting an optical signal reflected from the body measurement part, and the light source or the light detector to adjust a direction or distance between the light source and the light detector. And a main controller configured to calculate a body fat with respect to the body measuring part by using a movement controller for controlling movement of the body and an optical signal detected by the photo detector.

Body fat, measurement, light source, light detector, moving

Description

Partial body fat measuring device and method thereof {APPARATUS FOR MEASURING PARTIAL FAT OF BODY AND METHOD THEREOF}

1 is a view showing the structure of a light source, a photo detector and a photo detector moving means according to the present invention.

2 is a diagram illustrating an example of positional movement with respect to the photodetector.

3 is a diagram illustrating an example of detecting an optical signal according to a positional shift of a photodetector.

4 is a view showing the configuration of a partial body fat measurement apparatus according to an embodiment of the present invention.

5 is a view showing a flow of a method for measuring partial body fat according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: detector

110: light source

120: light detector

130: light detector moving means

The present invention relates to a partial body fat measuring apparatus and a method thereof, and more particularly, to a device and method for measuring the thickness of the subcutaneous fat having a light source and a light detector and moving the light source or the light detector.

The body is made up of four main components: body water, protein, body fat, and minerals. In general, obesity refers to a state of overweight, but precisely, a state in which a relatively large amount of fat is broken due to a balance between two components of energy-using muscle and energy-releasing body fat. Obesity is often diagnosed as the ratio of body fat mass to body weight, ie body fat percentage. Excluding body fat, body weight is mostly determined by skeletal and muscle mass, so body fat percentage is determined by the ratio of muscle mass and body fat mass. Therefore, when the body fat amount is higher than the standard value or the muscle mass is shorter than the standard value, the body fat rate becomes high. As described above, obesity is not simply determined by weight alone, and a slim young woman may be determined to be obese when muscle mass is insufficient despite being underweight.

Therefore, accurate body fat measurement has been required in order to quantitatively measure the components constituting such a body and repeatedly measure their mutual ratio to determine obesity.

As an example of a conventional method for measuring body fat, US Pat. No. 4,928,014 measures body fat using two light sources and a light detector, but has a problem in that the depth of penetration through subcutaneous tissue required for measuring partial body fat is limited.

In addition, as an example of a conventional body fat measurement method, European Patent No. 92250064 has a problem that it is difficult to miniaturize for mounting on a small device such as a mobile phone due to the configuration of measuring the subcutaneous fat using a plurality of light sources.

Therefore, there is an urgent need for a method of measuring body fat more accurately by using one light source and a light detector.

The present invention has been made to solve the problems of the prior art as described above, by using a plurality of light sources and light detectors by using a single light source and light detector by measuring the body fat by moving the position of one light source and light detector. It is an object of the present invention to provide a partial body fat measuring apparatus and method that can achieve the effect.

Another object of the present invention is to provide a partial body fat measuring apparatus and method for improving the accuracy and reliability of the measured body fat by measuring the body fat by moving one light source and the photo detector in a plurality of directions or positions.

It is still another object of the present invention to provide a partial body fat measuring apparatus and method for measuring partial body fat anytime and anywhere by mounting on a portable terminal because it can be easily miniaturized by using one light source and a light detector.

In order to achieve the above object and to solve the problems of the prior art, the present invention provides a light source for irradiating light to the body measurement site, an optical detector for detecting an optical signal reflected from the body measurement site, the light source and the light detector A movement control unit for controlling the light source or the photo detector to move in order to adjust the direction or distance therebetween, and a main control unit for calculating body fat for the body measurement part using the optical signal detected by the photo detector. A partial body fat measurement apparatus is provided.

According to another aspect of the present invention, a method for measuring partial body fat includes irradiating light to a body measurement part using a light source, detecting an optical signal reflected on the body measurement part through a light detector, and Setting a direction or distance between the photo detectors; Detecting an optical signal reflected from the body measuring part through the optical detector having a direction or distance to the light source and calculating body fat with respect to the body measuring part using the optical signal detected by the optical detector; It includes a step.

Hereinafter, an apparatus and method for measuring partial body fat according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing the structure of a light source, a photo detector and a photo detector moving means according to the present invention.

Referring to FIG. 1, the detector 100 includes a light source 110, a photo detector 120, and a photo detector moving means 130, and detects a signal for measuring body fat with respect to a body measurement part.

The light source 110 irradiates light to the body measurement site for measuring partial body fat. That is, the light source 110 irradiates the body measurement site for measuring partial body fat with light set to a wavelength such as 660 nm, 940 nm, and the like. In addition, the light source 110 irradiates the body measurement part with light corresponding to the set wavelength in consideration of the distance and the direction of the light detector 120.

The photo detector 120 detects the light signal reflected from the fat layer of the body measurement part by the light irradiated to the body measurement part from the light source 110 through the skin of the body measurement part. The photo detector 120 may be changed to a first position P11, a second position P12, or a third position P13 by the photo detector moving means 130. Therefore, as the position of the photo detector 120 is changed by the photo detector moving means 130, the distance from the light source 110 is adjusted. In addition, the light detector 120 is irradiated to the skin of the body measurement site from the light source 110 in the first position (P11) to the third position (P13) penetrates the skin of the body measurement site to measure the body Each of the optical signals reflected from the fat layer of the site is detected.

The photo detector moving means 130 moves the position of the photo detector 120 to adjust the set direction or distance between the light source 110 and the photo detector 120. The photo detector moving means 130 moves the photo detector 120 from the first position P11 to the second position P12 to widen the distance between the light source 110 and the photo detector 120. In addition, the photo detector moving means 130 moves the photo detector 120 from the second position P12 to the third position P13 in order to widen the distance between the light source 110 and the photo detector 120.

The photo detector moving means 130 may move the position of the photo detector 120 by using a motor, and determine the position of the moved photo detector 120 by adjusting the driving time of the motor. For example, if the photo detector moving means 130 can move the photo detector 120 by 0.5 cm while driving the motor for 1 second, the position of the photo detector 120 can be moved by 1 cm when the motor is driven for 2 seconds. have. Therefore, assuming that the photo detector moving means 130 drives the motor for 2 seconds to move the position of the photo detector 120 from the first position P11 to the third position P13 at the first position P11. When the distance between the light source 110 and the photo detector 120 is 0.5 cm, the distance between the light source 110 and the photo detector 120 is 1 cm at the second position P12 and the light source 110 at the third position P13. ) And the photodetector 120 may be 1.5 cm.

As described above, in one embodiment of the present invention, the optical signal is moved through the photo detector located at different points by adjusting the distance between the light source and the photo detector by moving the position of the photo detector through the photo detector moving means. Each detection can have the same effect as using a plurality of photo detectors using one photo detector.

In addition, in another embodiment of the present invention by moving the position of the light source through the light source moving means to adjust the direction or distance between the light detector and the light source, even if a single light source is used, the same effect as using a plurality of light sources Can have

In another embodiment of the present invention, the light source is moved through the light source moving means, and the light detector is moved through the light detector moving means to adjust the direction or distance between the light source and the light detector, respectively. Even one by one can produce the same effect as using a plurality of light sources and photo detectors.

Therefore, the body fat measurement apparatus according to the present invention can adjust the direction or distance between the light source and the photo detector by moving the position of the light source or the photo detector, so that a plurality of light sources and the photo detector may be used even if one light source and one photo detector are used. The same effect as that can be obtained.

2 is a diagram illustrating an example of positional movement with respect to the photodetector.

Referring to FIG. 2, the light source 110 irradiates light to a body measurement site for measuring partial body fat. That is, the light source 110 irradiates the body measurement part with light according to the set wavelength in consideration of the distance or direction with respect to the photodetector 120. As the position of the photo detector 120 is moved while the position of the light source 110 is fixed, the distance or direction with respect to the photo detector 120 is relatively changed.

The photo detector 120 detects the light signal reflected from the fat layer of the body measurement part by the light irradiated to the body measurement part from the light source 110 through the skin of the body measurement part. The photo detector 120 is changed in position by the photo detector moving means. The photo detector moving means may move the photo detector 120 in various directions to adjust the distance or direction between the light source 110 and the photo detector 120. The photo detector moving means moves the photo detector 120 according to the driving of the motor, and when the moving distance of the photo detector 120 is determined according to the driving time of the motor, the light source 110 and the light are moved by the moving distance. The distance between the detectors 120 is also determined.

Therefore, the photo detector 120 is adjusted to the distance or direction with respect to the light source 110 as its position is changed by the photo detector moving means.

The photo detector 120 may be disposed at the first position P21 as the photo detector moving means moves from the reference position P20 to the first direction D1 by the photo detector moving means, and the first position at the reference position P20. As it is changed to P21, the distance or direction with respect to the light source 110 is changed.

In addition, the photodetector 120 may be disposed at the second position P21 as the photodetector moving means moves from the reference position P20 to the second direction D2 opposite to the first direction D1. The distance and direction with respect to the light source 110 may also change as the reference position P20 changes from the reference position P20 to the second position P22.

In addition, the photodetector 120 may be disposed at the third position P23 as the photodetector moving means moves from the reference position P20 to the third direction D3 by the photodetector moving means. As it is continuously moved, it may be disposed in the fourth position P24, and the distance from the light source 110 is varied according to the third position P23 or the fourth position P24.

In addition, the photodetector 120 may be disposed in the third position P23 as the photodetector moving means moves from the first position P21 to the fourth direction D4 by the photodetector moving means. In the fifth direction (D5) to be disposed in the fourth position (P24), the distance or direction with the light source 110 is changed according to the third position (P23) or the fourth position (P24).

In addition, the photo detector 120 may be disposed in the third position P23 by moving the photo detector 120 in the sixth direction D6 from the second position P22 by the photo detector moving means, and at the second position P22. The light source 110 may be disposed in the fourth position P24 by moving in the seventh direction D7, and the distance or direction with respect to the light source 110 is changed according to the third position P23 or the fourth position P24.

As another example of the present invention, the position of the light source 110 may be moved through the light source moving means without moving the photo detector 120. That is, in another example of the present invention, the distance or direction between the light source 110 and the light detector 120 may be adjusted by moving the position of the light source 110 through the light source moving means without moving the position of the light detector 120. It can be changed.

As another example of the present invention, the light source 110 may be moved through the light source moving unit, and the light detector 120 may be moved through the light detector moving unit. That is, in another example of the present invention, the positions of the light source 110 and the photo detector 120 may be moved, respectively, to change the distance or direction between the light source 110 and the photo detector 120.

As described above, the partial body fat measurement apparatus according to the present invention can change the distance or direction between the light source and the photo detector by moving the position of the light source or the photo detector through the moving means.

In addition, the partial body fat measurement apparatus according to the present invention can improve the accuracy and reliability of the measured body fat by measuring the body fat by moving one light source and the light detector in a plurality of directions or positions.

3 is a diagram illustrating an example of detecting an optical signal in accordance with a positional shift of the photodetector.

Referring to FIG. 3, the light source 110 irradiates the skin of the body measurement part with light of the set multiple wavelengths. That is, the light source 110 irradiates the skin of the body measurement part with light of multiple wavelengths set by the distance or direction with respect to the photo detector 120. The light irradiated by the light source 110 passes through the skin tissue of the body measurement site, and the passed light is reflected by subcutaneous adipose tissue or muscle tissue.

The photo detector 120 detects light reflected from the skin of the body measurement part. That is, the photo detector 120 detects different light reflected from the skin of the body measurement part according to the distance from the light source 110.

The photo detector 120 detects the first optical signal reflected by the light irradiated from the light source 110 at the first position P31 through the skin of the body measurement part by a first thickness d1. That is, since the photodetector 120 has a short distance from the light source 110 at the first position P31, the first light reflected through the first thickness d1 having a thin thickness with respect to the skin of the body measurement part. Detect the signal.

In addition, when the photo detector 120 is moved from the first position P31 to the second position P32 by the photo detector moving means 130, light emitted from the light source 110 is applied to the skin of the body measurement site. The second optical signal reflected through the second thickness d2 is detected. That is, when the photo detector 120 is moved from the first position P31 to the second position P32, the second thickness d2 thicker than the first thickness d1 as the distance from the light source 110 increases. The second optical signal reflected through the signal is detected.

In addition, when the photo detector 120 is moved to the third position P33 by the photo detector moving means 130, the light radiated from the light source 110 has a third thickness d3 with respect to the skin of the body measurement site. Detects the third optical signal reflected by passing through. That is, when the photodetector 120 is moved from the second position P32 to the third position P33, as the distance from the light source 110 increases, a third thickness thicker than the second thickness d2 ( The third optical signal reflected through d3) is detected.

As described above, the partial body fat measurement apparatus according to the present invention adjusts the distance between the light source 110 and the light detector 120 due to the movement of the light detector 120. Each of the optical signals irradiated from 110 and reflected from the skin of the body measurement site may be detected. The optical signal has a different thickness reflected through the skin of the body measurement part according to the distance between the light source 110 and the photo detector 120.

Therefore, the partial body fat measurement apparatus according to the present invention uses a plurality of light sources and light detectors by moving the light source and the light detector by a set direction or distance to accurately measure the thickness of the subcutaneous fat using one light source and one light detector, respectively. The same effect as that of detecting the optical signal can be obtained.

4 is a view showing the configuration of a partial body fat measurement apparatus according to an embodiment of the present invention.

Referring to FIG. 4, the body fat measuring apparatus 400 includes a sensing means 410 and a body fat measuring means 420.

The sensing means 410 includes a light source 411, a light detector 412, and a moving means 413, and senses a signal for measuring partial body fat at a body measurement site for measuring partial body fat.

The light source 411 irradiates a light source to a body measurement site for measuring partial body fat. The light source 411 irradiates a light source having a wavelength set under the control of the light source controller 421 to the body measurement part.

The photo detector 412 detects light reflected from the body measurement part. The moving means 413 adjusts the direction or distance between the light source 411 and the light detector 412 by moving the position of the light detector 412. That is, the movement means 413 may adjust the direction or distance between the light source 411 and the photo detector 412 by moving the position of the photo detector 412 under the control of the movement controller 424. The photo detector 412 detects the optical signal reflected from the body measurement part according to the position moved by the moving means 413. The photo detector 412 detects the first optical signal at the first position P31 as shown in FIG. 3, and detects the second optical signal at the second position P32 moved by the moving means 413. Then, the third optical signal is detected at the third position P3 moved by the moving means 413.

As such, in one embodiment of the present invention, the moving means 413 acts as a photo detector moving means for moving the photo detector 412 according to a set direction or distance between the light source 411 and the photo detector 412.

Therefore, the partial body fat measurement apparatus according to the present invention includes a light source 411 and a light detector 412, and one light source and one light source as the position of the light detector 412 is moved by the moving means 413. Even using a photo detector, the same effect as using a plurality of light sources and photo detectors can be obtained.

In another embodiment of the present invention, the moving means may operate as a light source moving means for moving the light source according to a set direction or distance between the light source and the light detector.

Further, in another embodiment of the present invention, the moving means may move both the light source and the light detector according to a set direction or distance between the light source and the light detector.

The body fat measuring means 420 includes a light source controller 421, a signal processor 422, a main control unit 423, a movement controller 424, a display unit 425, and a communication unit 426, and a sensing unit 410. The body fat for the body measurement site is measured using the signal detected by.

The light source controller 421 controls the light source 411 so that the wavelength of the light source 411 is set according to the distance or direction between the light source 411 and the light detector 412. That is, the light source controller 421 sets multiple wavelengths of the light source 411 according to the distance or direction between the light source 411 and the photo detector 412, and controls the light source 411 to operate at the set wavelength.

The signal processor 422 includes an amplifier 422-1, an A / D converter 422-2, and a signal processor 422-3, and uses the optical signal detected by the sensing means 410 to measure body fat. Various signal processing operations are performed on the optical signal to measure. The amplifier 422-1 amplifies the optical signal detected at each position to which the photo detector 412 of the sensing means 410 is moved, and the A / D converter 422-2 converts the amplified analog optical signal into a digital signal. The signal processor 422-3 performs signal processing to remove noise on the optical signal converted into the digital signal.

The main controller 423 calculates body fat by analyzing the detected optical signal according to the positional movement of the photodetector 412 through the sensing means 410, and performs various control operations necessary for detecting the optical signal. The main controller 423 detects the state of the light source 411 through the light source controller 421 and controls the light source controller 421 to set the wavelength of the light source 411. In addition, the main controller 423 sets a direction or distance for moving the light source 411 or the light detector 412, and moves the light source 411 or the light detector 412 according to the set direction or distance. The control unit 424 is controlled.

The main controller 423 receives the optical signal from which the various signal processing is performed from the signal processor 422, and analyzes the transmitted optical signal to calculate partial body fat for the body measurement part. That is, the main controller 423 receives various signal-processed signals with respect to the optical signal detected according to each position of the photo detector 412 from the signal processor 422, and analyzes the transmitted signals to analyze the body measurement part. Calculate partial body fat data for.

The main control unit 423 controls the display unit 425 to display the calculated partial body fat data. The main control unit 423 controls the communication unit 426 to transmit the calculated partial body fat data to a terminal or system desired by the user. The terminal or system may be a terminal or system that manages body fat data of the user.

The movement controller 424 controls the movement means 413 to move the position of the photo detector 412 according to the direction or distance set by the main controller 423. The movement controller 424 is a motor that is an example of the movement means 413 for moving the photo detector 412 to adjust the direction or distance between the light source 411 and the photo detector 412 under the control of the main controller 423. To control the operation. The position of the photo detector 412 is changed according to the operation time of the motor.

As described above, in one embodiment of the present invention, the movement controller 424 is a movement means 413 which is a photo detector movement means such that the photo detector 412 is moved according to a set distance or direction between the light source 411 and the photo detector 412. ).

In another embodiment of the present invention, the movement control unit controls the light source moving unit to move the light source according to a set distance or direction between the light source and the light detector.

In another embodiment of the present invention, the movement controller controls the movement means such that the light source and the photo detector are moved according to a set distance or direction between the light source and the photo detector.

The display unit 425 displays the calculated partial body fat data under the control of the main control unit 423.

The communication unit 426 transmits the calculated partial body fat data to the terminal or system designated by the user under the control of the main controller 423. The terminal or system may be a device or system that manages body fat data of the user. The communication unit 426 transmits the partial body fat data to the terminal or the system according to various wireless communication methods such as Bluetooth, RF, and the like. In addition, the communication unit 426 may transmit the calculated partial body fat data to the terminal or the system by a wired communication method using a data cable.

As described above, the partial body fat measurement apparatus 400 according to the present invention measures the body fat by detecting a plurality of optical signals in each direction or position by moving one light source and one light detector in a predetermined direction or position. Improve accuracy and reliability of body fat data.

In addition, the partial body fat measurement apparatus 400 according to the present invention may be easily miniaturized by using only one light source and one light detector, and may also reduce resources.

5 is a view showing the flow of the body fat measurement method according to another embodiment of the present invention.

Referring to FIG. 5, in operation 510, the body fat measuring apparatus irradiates light to a body measuring part for measuring partial body fat using a light source. The body fat measuring device sets the multiple wavelengths of the light source in consideration of the distance or direction between the light source and the light detector.

In operation 520, the body fat measurement device detects an optical signal for light reflected from the body measurement site through the light detector. That is, in step 520, the body fat measuring device detects the first optical signal that is irradiated through the light source and reflected from the body measurement part when the light detector is disposed at the first position.

In operation 530, the body fat measurement apparatus sets a direction or a distance between the light source and the light detector. In step 530, the body fat measuring device controls the driving time of the motor for moving the position of the light source or the light detector, for example, to set the direction or distance between the light source and the light detector.

In operation 530, the body fat measuring device may set the direction or distance between the light source and the photo detector by moving the photo detector through an optical detector moving means as an example.

In operation 530, the body fat measuring apparatus may set the direction or distance between the light source and the light detector by moving the light source through a light source moving means as another example.

In step 530, the body fat measuring device is another example of moving the light source through the light source moving unit, and moving the position of the photo detector through the light detector moving unit to adjust the direction or distance between the light source and the photo detector. Can also be set.

As described above, the method for measuring partial body fat according to the present invention uses a plurality of light sources even when using one light source and one light detector by moving the positions of the light source or the light detector according to a set direction or distance between the light source and the light detector. Alternatively, the same effect as using the photo detector can be obtained.

In operation 540, the body fat measurement device detects an optical signal for light reflected from the body measurement part through a light detector in which a direction or distance to the light source is set. That is, in step 540, the body fat measuring device is reflected from the body measurement part through the light detector in which the direction or distance with the light source is set as the light source or the photo detector is moved to the second position at the first position. The second optical signal is detected.

As described above, the body fat measuring method according to the present invention detects one light source or photodetector by detecting an optical signal through the photodetector in which the distance or direction with respect to the light source is set as the position of the light source or the photodetector is moved. Even if used, a plurality of optical signals can be detected as if using a plurality of light sources or photo detectors.

In operation 550, the body fat measurement device calculates partial body fat for the body measurement site using the optical signal detected by the photo detector. That is, in step 550, the body fat measuring device analyzes the first light signal and the second light signal detected by the light detector according to the movement of the light source or the light detector, and thus the part of the body fat measurement part. Calculate your body fat.

Therefore, the body fat measuring method according to the present invention may calculate partial body fat for the body measurement site by analyzing the plurality of detected optical signals through one light source and one light detector.

In step 560, the body fat measurement apparatus displays the calculated body fat data through display means. That is, in step 560, the body fat measuring device displays the calculated partial body fat data through the display means according to the partial body fat measurement result or displays the calculated partial body fat through the display means according to a user's request. do.

In step 570, the body fat measurement device transmits the calculated body fat data to a terminal or system designated by the user. In operation 570, the body fat measuring device may store the calculated body fat data in a memory and periodically transmit the stored body fat data to the terminal or the system. In operation 570, the body fat measuring device may transmit the calculated body fat data or the body fat data stored in the memory to the terminal or the system according to the user's request.

As described above, the method for measuring partial body fat according to the present invention has the same effect as using a plurality of light sources and light detectors even when using one light source and a light detector by adjusting the direction or distance between the light source and the light detector when measuring body fat. As a result, partial body fat can be measured more accurately.

In addition, the method for measuring partial body fat according to the present invention may improve the accuracy and reliability of the measured body fat by moving a light source or a photo detector relative to detect a plurality of optical signals through the photo detector and measuring the body fat using the same. have.

The method for measuring partial body fat according to the present invention includes a computer readable medium containing program instructions for performing various computer-implemented operations. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The media may be program instructions that are specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media and hardware devices specially configured to store and carry out program instructions such as ROM, RAM, flash memory and the like. The medium may be a transmission medium such as an optical or metal line, a wave guide, or the like, including a carrier wave for transmitting a signal designating a program command, a data structure, or the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above-described embodiments, which can be variously modified and modified by those skilled in the art to which the present invention pertains. Modifications are possible. Accordingly, the spirit of the present invention should be understood only in accordance with the following claims, and all equivalents or equivalent variations thereof are included in the scope of the present invention.

According to the present invention, the same effect as using a plurality of light sources and light detectors can be obtained by adjusting the direction or distance between the light source and the light detector when measuring body fat.

In addition, according to the present invention, by moving the direction or distance between the light source and the light detector relatively to either the light source or the light detector to measure the body fat by using the respective detected optical signal to improve the accuracy and reliability of the measured body fat Can be.

In addition, according to the present invention, there is an advantage in that the partial body fat can be measured anytime and anywhere by being able to be mounted on the portable terminal through miniaturization using one light source and a light detector.

Claims (12)

A light source for irradiating light to the body measurement site; An optical detector detecting an optical signal reflected from the body measurement part; A movement control unit controlling the light source or the photo detector to move in order to adjust a direction or distance between the light source and the photo detector; A light source control unit controlling the light source to set a wavelength according to a direction or a distance between the light source and the light detector; And Main control unit for calculating the body fat for the body measurement part using the optical signal detected by the photo detector Partial body fat measurement device comprising a. The method of claim 1, The main fisherman, A partial body fat measurement apparatus, characterized by setting a direction or distance for moving the light source or the photo detector. 3. The method of claim 2, Further comprising photo detector moving means for moving the photo detector, The movement control unit, And controlling said photo detector moving means to move said photo detector by said set direction or distance. 3. The method of claim 2, Further comprising a light source moving means for moving the light source, The movement control unit, And controlling the light source moving means to move the light source by the set direction or distance. The method of claim 1, Further comprising a motor for moving the light detector or the light source, The movement control unit, Partial body fat measurement device, characterized in that for controlling the drive of the motor. delete The method of claim 1, Partial body fat measurement device further comprises a communication unit for transmitting the calculated body fat data. In the method of measuring partial body fat, Irradiating light to the body measurement site using a light source; Detecting an optical signal reflected by the body measurement part through an optical detector; Setting a direction or distance between the light source and the photo detector; Controlling a wavelength to be set according to a direction or a distance between the light source and the light detector through a light source controller; Detecting an optical signal reflected from the body measurement part through the photo detector having a direction or a distance from the light source; And Calculating body fat for the body measurement site using the optical signal detected by the optical detector Partial body fat measurement method comprising a. 9. The method of claim 8, The step of setting the direction or distance between the light source and the photo detector, And changing the position of the light source or the photo detector to set the direction or distance between the light source and the photo detector. 9. The method of claim 8, The step of setting the direction or distance between the light source and the photo detector, And controlling the driving time of the motor for changing the position of the light source or the photo detector to set the direction or distance between the light source and the photo detector. 9. The method of claim 8, And transmitting the calculated body fat data to a terminal or a system designated by a user. A computer-readable recording medium for recording a program for executing the method of any one of claims 8 to 11 on a computer.

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