JP4715930B2 - Optical subcutaneous fat thickness measuring device - Google Patents

Description

  The present invention relates to an optical subcutaneous fat thickness measuring apparatus capable of optically measuring subcutaneous fat thickness.

  Conventionally, there has been proposed an optical subcutaneous fat thickness measurement device that measures the subcutaneous fat thickness inside a living body by irradiating light from the light irradiating portion toward the surface of the living body and receiving the light propagated inside the living body by the light receiving portion. ing. In such an optical subcutaneous fat thickness measurement apparatus, the subcutaneous fat measurement apparatus disclosed in Patent Document 1 enables measurement of subcutaneous fat thickness with high accuracy without being affected by differences in skin color or the like. The subcutaneous fat measuring device of Patent Document 1 includes at least one light transmitting element, a plurality of light receiving elements, and fat thickness estimating means.

  Then, the fat thickness estimation means estimates the fat thickness by applying the received light amount transmitted through the subcutaneous fat and received by the light receiving element to the calibration curve of the received light amount and the subcutaneous fat thickness. The fat thickness estimation means can measure the subcutaneous fat thickness with high accuracy by correcting the amount of light received by each light receiving element by skin pigment or the like using the amount of light received by the light receiving element closest to the light transmitting element. It is like that.

  The optical subcutaneous fat thickness measurement apparatus of Patent Document 2 includes a light source unit that irradiates light toward a living body, a light receiving unit that receives light emitted from the living body surface and propagating through the living body, and a living body surface having a predetermined shape. A molding part to be molded, a pressure detection part for detecting that the pressure applied to the living body surface by the molding part has reached a specified value, and a calculation part for calculating the subcutaneous fat thickness based on the amount of light received by the light receiving part. Yes. The arithmetic unit stores in advance a plurality of primary regression lines indicating the correlation between the amount of received light and the thickness of subcutaneous fat in accordance with a plurality of pressures applied to the living body. And the calculation part can measure the subcutaneous fat thickness with high accuracy by selecting the primary regression line corresponding to the pressure applied to the living body from a plurality of measurements and measuring the subcutaneous fat thickness. Yes.

JP 2000-155091 A JP 2003-310575 A

  By the way, as a conventional optical subcutaneous fat thickness measuring apparatus, a linear regression line indicating the correlation between the amount of received light and the thickness of subcutaneous fat corresponding to each of the different parts of the subcutaneous fat thickness (for example, the second arm, thigh, and abdomen). Some are set. In such an optical subcutaneous fat thickness measuring apparatus, the subject operates the selection button in advance to measure the selected part. For this reason, in the conventional optical subcutaneous fat thickness measuring apparatus, there is a problem that the selection button for each part must be operated, and the operation is complicated. Furthermore, in the conventional optical subcutaneous fat thickness measuring apparatus, a selection button for selecting a region has to be provided on the apparatus, and the apparatus cannot be reduced in size and cost.

  The present invention has been made paying attention to such problems existing in the prior art, and its purpose is to measure the subcutaneous fat thickness of different parts of a living body even with the operation of one input unit. It is an object of the present invention to provide an optical subcutaneous fat thickness measuring device that can be operated and is easy to operate, and that can reduce the size and cost of the device.

  In order to solve the above problem, the invention according to claim 1 is a light irradiation unit that irradiates light toward the surface of a living body, a light receiving unit that receives light propagated inside the living body, and the light receiving unit. A database unit storing a function shared by each part of the living body and correlating a light receiving parameter value obtained based on the amount of light received at the part and a value of subcutaneous fat thickness in each part of the living body; A control unit that estimates the value of the subcutaneous fat thickness with reference to the function of the database unit based on a received light parameter value; and an input unit for instructing the control unit to start measurement of the subcutaneous fat thickness; And a notifying unit for notifying the subject of the value of the subcutaneous fat thickness estimated by the control unit.

  According to this, when one input unit is operated, the optical subcutaneous fat thickness measurement apparatus starts measurement of subcutaneous fat thickness. And a control part estimates subcutaneous fat thickness using the function shared in each site | part of a biological body based on the obtained light reception parameter value. Therefore, even if the thickness of the subcutaneous fat thickness is different, the subcutaneous fat thickness of each site can be measured by using a function shared by each site. Therefore, unlike the case where it is necessary to operate the selection button for each part to be measured, the operation is simple. In addition, since only one input unit is operated when measuring subcutaneous fat thickness, the optical subcutaneous fat thickness measuring apparatus can be downsized and reduced compared to the case where a selection button is required for each measurement site. Cost can be increased.

The invention of claim 1, prior Symbol function is summarized in that the light receiving parameter value is exponential slope increases as increases. According to this, in the exponential function, and the light receiving parameter value increases, to indicate that the subcutaneous fat thickness increases, the use of the exponential function, precisely a thin subcutaneous fat thickness thick to thick subcutaneous fat thickness thicker Can be measured.

According to a second aspect of the invention, in the optical subcutaneous fat thickness measuring apparatus according to claim 1, wherein the light receiving parameter values, a first light receiving portion provided at the first distance away from the light irradiation unit And the second received light amount at the second light receiving unit provided at a position separated from the light irradiation unit by a second distance longer than the first distance. To do.

  According to this, the subcutaneous fat thickness can be calculated using the light receiving parameter value in which the influence due to the difference between the skin pigment and the light absorption / scattering characteristics is corrected, and the subcutaneous fat thickness can be measured with high accuracy.

According to a third aspect of the present invention, in the optical subcutaneous fat thickness measurement apparatus according to the first or second aspect , the database unit stores a plurality of functions having different coefficients depending on the light reception parameter value, The gist of the present invention is that the control unit selects one of a plurality of functions based on the light receiving parameter value and estimates the subcutaneous fat thickness.

According to this, the subcutaneous fat thickness of each part of the living body can be measured.
According to a fourth aspect of the present invention, in the optical subcutaneous fat thickness measurement device according to any one of the first to third aspects, when the light irradiation unit is pressed against the surface of the living body, the living body A pressure detection unit that detects a pressure applied to the surface of the light source, and the control unit causes the light irradiation unit to emit light when a pressure equal to or greater than a predetermined value is detected by the pressure detection unit. And

  According to this, when a pressure equal to or higher than a predetermined value is applied to the surface of the living body, the light irradiating unit is reliably pressed against the surface of the living body, and this state refers to the light emitting surface of the light irradiating unit and the living body. It is in a state in which external light is prevented from entering between the surface and the surface. Then, by irradiating the light irradiator with light when a pressure equal to or higher than a predetermined value is detected by the pressure detector, it is possible to accurately measure the subcutaneous fat thickness without being affected by external light. .

  According to the present invention, it is possible to measure the subcutaneous fat thickness of different parts of a living body even with the operation of one input unit, and the operation is simple, and the apparatus can be reduced in size and cost. it can.

The schematic diagram which shows the optical subcutaneous fat thickness measuring apparatus of 1st Embodiment. The bottom view which shows the main body board | substrate and measurement board of an optical subcutaneous fat thickness measuring apparatus. The figure which shows the display part and input button in the surface of an optical subcutaneous fat thickness measuring apparatus. (A) is a graph showing a correlation between the amount of received light and subcutaneous fat thickness and a linear regression line, and (b) is a graph showing a correlation between the amount of received light and subcutaneous fat thickness and an exponential function. (A) is a graph showing the correlation between the received light amount ratio and the subcutaneous fat thickness and a linear regression line, and (b) is a graph showing the correlation between the received light amount ratio and the subcutaneous fat thickness and an exponential function. The graph which shows the correlation with the non-linear function stored in the database part, received light quantity ratio, and subcutaneous fat thickness. The graph which shows the correlation and the linear regression line of the subcutaneous fat thickness of the thigh, the upper arm, and the abdomen, and the received light amount ratio. The schematic diagram which shows the optical subcutaneous fat thickness measuring apparatus of 2nd Embodiment. The graph which shows the nonlinear function which consists of two linear regression lines.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the optical subcutaneous fat thickness measuring apparatus 10 includes a rectangular plate-shaped main body substrate 11, and a disk-shaped measuring plate 12 is formed at the center of the lower surface of the main body substrate 11. Is provided. The measurement plate 12 is formed of black ABS having a diameter of about 120 mm, and the lower surface of the measurement plate 12 is pressed against the surface of the living body 20 when measuring the subcutaneous fat thickness. The living body 20 has three layers of skin 20a on the surface, subcutaneous fat 20b under the skin 20a, and muscle 20c under the subcutaneous fat 20b.

  The measurement plate 12 is provided with a light emitting element 13 as a light irradiation unit. The light emitting element 13 is an LED having a center wavelength of 750 nanometers (nm). Note that the center wavelength of light emitted from the light emitting element 13 is preferably in the near infrared region of 500 to 2500 nanometers (nm), and a laser diode may be used for the light emitting element 13. The light emitting element 13 has a light emitting surface exposed on the lower surface of the measurement plate 12 and can emit light from the lower surface of the measurement plate 12 toward the skin 20a of the living body 20.

  As shown in FIG. 2, the measurement plate 12 is provided with a first light receiving element 14 as a first light receiving unit at a position separated from the light emitting element 13 by a first distance k1. The first light receiving element 14 is formed of a photodiode. The first light receiving element 14 is provided on the measurement plate 12 so that the light receiving surface is exposed on the lower surface of the measurement plate 12, receives light emitted from the light emitting element 13 and further passes through the living body 20 and detects the amount of light received. It is supposed to be. The measurement plate 12 is provided with a second light receiving element 15 as a second light receiving portion at a position separated from the light emitting element 13 by a second distance k2. The second light receiving element 15 is made of a photodiode. The second light receiving element 15 is provided on the measurement plate 12 so that the light receiving surface is exposed on the lower surface of the measurement plate 12, receives light emitted from the light emitting element 13 and transmitted through the living body 20, and detects the amount of received light. It is supposed to be.

  On the measurement plate 12, a light emitting element 13, a first light receiving element 14, and a second light receiving element 15 are linearly arranged. The first distance k1 between the light emitting element 13 and the first light receiving element 14 is preferably short in order to correct the influence due to the difference in skin pigment and light absorption / scattering characteristics, and is set to 10 to 50 mm, for example. Is preferred. The second distance k2 between the light emitting element 13 and the second light receiving element 15 is preferably set to be longer than the first distance k1 and set to 20 to 100 mm.

  As shown in FIG. 3, on the surface of the optical subcutaneous fat thickness measuring apparatus 10, a display unit 10a as a notification unit and an input button 10b as an input unit are provided. “Subcutaneous fat thickness” is displayed on the surface of the input button 10b. By operating the input button 10b, the optical subcutaneous fat thickness measuring apparatus 10 is instructed to start measuring the subcutaneous fat thickness. When the subcutaneous fat thickness is measured by the optical subcutaneous fat thickness measuring apparatus 10, the measured subcutaneous fat thickness is displayed on the display unit 10a, and the measured subcutaneous fat thickness is notified to the subject by the display on the display unit 10a. It has become so. In addition, the display part 10a is formed with a liquid crystal screen, and displays subcutaneous fat thickness by a numerical value.

  As shown in FIG. 1, in the optical subcutaneous fat thickness measuring apparatus 10, the display unit 10a and the input button 10b are electrically connected to the control unit 16, and the display on the display unit 10a is controlled by the control unit 16. The control unit 16 is instructed to start measuring the subcutaneous fat thickness by operating the input button 10b.

  The light emitting element 13 is electrically connected to the control unit 16, and the control unit 16 controls lighting and extinguishing of the light emitting element 13. The first light receiving element 14 and the second light receiving element 15 are electrically connected to the control unit 16. The received light amount detected by the first light receiving element 14 and the received light amount detected by the second light receiving element 15 are sent to the control unit 16. The control unit 16 is provided with a database unit 17. The database unit 17 stores a function used when calculating the value of the subcutaneous fat thickness based on the amount of light received by the first light receiving element 14 and the second light receiving element 15.

  Here, a function used when calculating the value of the subcutaneous fat thickness will be described. 4 (a) and 4 (b) show the results when the subcutaneous fat thickness of the living body simulated model is measured using the optical subcutaneous fat thickness measuring apparatus 10. FIG. Although not shown in the drawings, the living body pseudo model is composed of two layers including a muscle model under the subcutaneous fat model. The subcutaneous fat model is formed of a material having high permeability in the near infrared region of 500 to 2500 nm, and is a muscle. The model is formed from a light absorber such as ABS.

  4A and 4B, the vertical axis indicates the thickness of the subcutaneous fat model (subcutaneous fat thickness), and the horizontal axis indicates the amount of light received by the second light receiving element 15. FIG. 4A shows a linear regression line G4a which is a function indicating the correlation between the subcutaneous fat thickness and the amount of received light. The correlation coefficient R between the subcutaneous fat thickness and the amount of received light in this linear regression line G4a is 0.93. On the other hand, FIG. 4B shows an exponential function G4b which is a function indicating the correlation between the subcutaneous fat thickness and the amount of received light. In this exponential function G4b, the correlation coefficient R between the subcutaneous fat thickness and the amount of received light is 0.98. Each of the linear regression line G4a and the exponential function G4b is obtained by the least square method or the like based on the relationship between the subcutaneous fat thickness measured in advance using ultrasonic waves, X-rays, MRI, etc. and the amount of light received at the subcutaneous fat thickness. can get.

  As shown in FIGS. 4A and 4B, the value of the subcutaneous fat thickness obtained using the linear regression line G4a is compared with the value of the subcutaneous fat thickness obtained using the exponential function G4b. As the amount of received light increases, the error increases. Therefore, it was shown that it is preferable to use an exponential function (nonlinear function) in order to calculate the value of subcutaneous fat thickness more accurately.

FIG. 5A and FIG. 5B are graphs showing the results when the subcutaneous fat thickness of the living body simulated model is measured using the optical subcutaneous fat thickness measuring apparatus 10.
In the graphs of FIGS. 5A and 5B, the vertical axis indicates the thickness of the subcutaneous fat model (subcutaneous fat thickness), and the horizontal axis indicates the amount of light received by the first light receiving element 14 and the second light receiving element 15. The received light amount ratio which is a relative ratio to the received light amount is shown. FIG. 5A shows a linear regression line G5a which is a function indicating the correlation between the subcutaneous fat thickness and the received light amount ratio. The correlation coefficient R between the subcutaneous fat thickness and the received light amount ratio in the linear regression line G5a is 0.89. On the other hand, FIG. 5B shows an exponential function G5b which is a function indicating the correlation between the subcutaneous fat thickness and the received light amount ratio. In this exponential function G5b, the correlation coefficient R between the subcutaneous fat thickness and the received light amount ratio is 0.97. Each of the linear regression line G5a and the exponential function G5b is based on the least square method or the like based on the relationship between the subcutaneous fat thickness measured in advance using ultrasonic waves, X-rays, MRI, etc. and the received light quantity ratio at the subcutaneous fat thickness. Is obtained.

  As shown in FIGS. 5 (a) and 5 (b), the value of the subcutaneous fat thickness obtained using the linear regression line G5a has a larger error as the received light amount ratio increases. Therefore, it was shown that it is preferable to use an exponential function (nonlinear function) in order to calculate the value of subcutaneous fat thickness more accurately. In addition, although not shown, it was shown that the variation in the value of the subcutaneous fat thickness with respect to the function used for the calculation is reduced when the subcutaneous fat thickness is calculated using the received light amount ratio. Therefore, by using the first light receiving element 14 and the second light receiving element 15, it is possible to more accurately calculate the subcutaneous fat thickness by correcting the influence due to the difference in skin pigment and light absorption / scattering characteristics.

  In this embodiment, the nonlinear function G6 shown in FIG. 6 is used as a function for calculating the subcutaneous fat thickness value, and the received light amount ratio is used as the received light parameter value for calculating the subcutaneous fat thickness. The nonlinear function G6 is created so that the conversion coefficient to the subcutaneous fat thickness increases as the received light quantity ratio increases, and the correlation coefficient R between the subcutaneous fat thickness and the received light quantity ratio is 0.84. This non-linear function G6 measures the actual subcutaneous fat thickness in advance using ultrasonic waves, X-rays, MRI, etc., and uses the least squares method from the relationship between the subcutaneous fat thickness and the received light quantity ratio at the measurement location of the subcutaneous fat thickness. It is obtained by approximating by

  In order to measure the thickness of the thigh, the second arm, and the abdomen of each part of the living body 20 using the optical subcutaneous fat thickness measuring apparatus 10 having the above-described configuration, first, the subject first measures the measurement plate 12, the thigh, When the optical subcutaneous fat thickness measurement apparatus 10 is turned on by pressing the upper arm or the abdominal surface and then operating the input button 10b, the control unit 16 turns on the light emitting element 13 for a predetermined time. The light emitted from the light emitting element 13 to the inside of the living body 20 propagates through the skin 20a, subcutaneous fat 20b, and muscle 20c of the thigh, the upper arm or the abdomen, and is received by the first light receiving element 14 and the second light receiving element 15. The The control unit 16 calculates a relative ratio (light reception amount ratio) between the light reception amount of the first light receiving element 14 and the light reception amount of the second light receiving element 15. Furthermore, the control unit 16 refers to the nonlinear function G6, and calculates (estimates) the subcutaneous fat thickness of the thigh, the second arm, or the abdomen based on the obtained light reception amount ratio. Next, the control unit 16 displays the calculated subcutaneous fat thickness on the display unit 10a.

  FIG. 6 shows values of subcutaneous fat thickness (thigh, second arm, and abdomen) calculated by the optical subcutaneous fat thickness measuring apparatus 10. The overall correlation coefficient R including the thigh, the second arm, and the abdomen is 0.84. Here, FIG. 7 shows a linear regression line G7 which is a function indicating the correlation between the subcutaneous fat thickness of the thigh, the upper arm, and the abdomen, and the received light amount ratio. Each linear regression line G7 measures the actual subcutaneous fat thickness in advance using ultrasonic waves, X-rays, MRI, etc., and the minimum is based on the relationship between the subcutaneous fat thickness and the received light quantity ratio at the location where the subcutaneous fat thickness is measured. It can be obtained by approximation by the square method or the like. The correlation coefficient R in the primary regression line G7 of the thigh is 0.75, the correlation coefficient R in the primary regression line G7 of the second arm is 0.81, and the correlation coefficient R in the primary regression line G7 of the abdomen is 0.84.

  Therefore, even if the nonlinear function G6 shown in FIG. 6 is compared with each primary regression line G7, there is almost no difference in the correlation coefficient. Therefore, by using the non-linear function G6, it is possible to measure the subcutaneous fat thickness of each part only by operating the input button 10b even in the part where the subcutaneous fat thickness is different, such as the abdomen, thigh, and the second arm.

According to the above embodiment, the following effects can be obtained.
(1) The optical subcutaneous fat thickness measurement apparatus 10 includes one input button 10b, and one non-linear function G6 is stored in the control unit 16. By using one nonlinear function G6, the subcutaneous fat thickness of the thigh, the second arm, and the abdomen can be measured. Therefore, unlike the case where it is necessary to operate the selection button for each part to be measured, it can be easily operated.

  (2) In the optical subcutaneous fat thickness measuring apparatus 10, the subcutaneous fat thicknesses of the thigh, the second arm, and the abdomen can be measured only by operating one input button 10b. Therefore, the optical subcutaneous fat thickness measuring apparatus 10 only needs to be provided with the input button 10b, and the optical subcutaneous fat thickness measuring apparatus 10 can be downsized as compared with the case where a selection button is required for each part to be measured. In addition, the manufacturing cost can be reduced by reducing the number of buttons.

  (3) As the light receiving parameter value used for calculating the subcutaneous fat thickness, the light receiving amount of the first light receiving element 14 separated from the light emitting element 13 by the first distance k1 and the light emitting element 13 by the second distance k2 longer than the first distance k1. The received light amount ratio, which is a relative ratio to the received light amount of the second light receiving element 15 away from the second light receiving element 15, was used. For this reason, the subcutaneous fat thickness can be calculated using the light receiving parameter value in which the influence due to the difference between the skin pigment and the light absorption / scattering characteristics is corrected, and the subcutaneous fat thickness can be measured with high accuracy.

  (4) A nonlinear function G6 was set as a function for calculating the subcutaneous fat thickness. This non-linear function G6 is a function in which the slope increases as the received light amount ratio increases. The increase in the amount of received light indicates that the thickness of the subcutaneous fat is increased. Therefore, by using the nonlinear function G6, it is possible to accurately measure the thickness of the subcutaneous fat from the thin thickness to the thick subcutaneous fat thickness. .

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. In the following description, the same components as those in the first embodiment described above are denoted by the same reference numerals, and redundant description thereof is omitted or simplified.

  As shown in FIG. 8, in the optical subcutaneous fat thickness measuring apparatus 10 of the second embodiment, an accommodation recess 11a is formed on the lower surface of the main body substrate 11, and a predetermined Young is placed in the accommodation recess 11a. A compression spring 31 having a rate is accommodated. One end (upper end in FIG. 8) of the compression spring 31 is in contact with the inner top surface of the housing recess 11a, and the other end (lower end in FIG. 8) is in contact with the surface (upper surface in FIG. 8). The compression spring 31 urges the measurement plate 12 away from the main body substrate 11 by a spring force.

  In addition, a pressure detector 32 is electrically connected to the compression spring 31, and the pressure detector 32 is electrically connected to the controller 16. When the measurement plate 12 is pressed against the surface of the living body 20, the compression spring 31 is compressed, and the pressure applied to the living body 20 is detected by the pressure detection unit 32. Furthermore, when the pressure detected by the pressure detection unit 32 becomes a predetermined value or more, the control unit 16 performs control to turn on the light emitting element 13 for a predetermined time. The predetermined value of the pressure is preferably set to a value applied to the pressure detector 32 when the entire lower surface of the measurement plate 12 is reliably pressed against the surface of the living body 20.

Therefore, according to the said 2nd Embodiment, in addition to the effect of (1)-(4) as described in 1st Embodiment, the following effects can be acquired.
(5) The optical subcutaneous fat thickness measurement apparatus 10 in the second embodiment includes a compression spring 31 and a pressure detection unit 32. And if the pressure detection part 32 detects the pressure more than predetermined value, the control part 16 will light the light emitting element 13, and will start the measurement of subcutaneous fat thickness. For this reason, the subcutaneous fat thickness is measured when the lower surface of the measurement plate 12 is reliably brought into contact with the surface of the living body 20, and the lower surface of the measurement plate 12 and the surface of the living body 20 are blocked during the measurement. It is possible to prevent external light from entering the lower surface of the measurement plate 12. As a result, scattering of light from the light emitting element 13 can be prevented, and subcutaneous fat thickness measurement using the light from the light emitting element 13 can be accurately performed.

In addition, you may change the said embodiment as follows.
As shown in FIG. 9, the functions stored in the database unit 17 are: a linear regression line G8a that approximates a light reception amount ratio in a region smaller than a predetermined value and a primary regression line G8b that approximates a region that is equal to or greater than a predetermined value. A non-linear function in which the slope increases as the received light amount ratio increases may be used. That is, the database unit 17 stores a primary regression line G8a and a primary regression line G8b having different coefficients depending on the received light amount ratio. Note that the approximation is such that the slope of the primary regression line G8b is larger than that of the primary regression line G8a. When such a nonlinear function is used, when the ratio of received light quantity is small, the control unit 16 selects the primary regression line G8a from the primary regression line G8a and the primary regression line G8b, calculates the subcutaneous fat thickness, and receives light. When the quantity ratio is large, the control unit 16 calculates the subcutaneous fat thickness using the primary regression line G8b among the primary regression line G8a and the primary regression line G8b. Even if comprised in this way, subcutaneous fat thickness can be measured with one input button 10b, without distinguishing the site | part of the biological body 20. FIG.

If a plurality of functions are stored in the database unit 17, a plurality of exponential functions may be stored instead of the primary regression lines such as the primary regression lines G8a and G8b.
In the optical subcutaneous fat thickness measurement apparatus 10 in which the linear regression lines G8a and G8b shown in FIG. 8 are stored in the database unit 17, the light reception parameter value is used as the amount of light received by the first light receiving element 14 or the second light receiving element 15. Also good.

○ Only one light receiving portion may be provided on the main body substrate 11, or three or more light receiving portions may be provided.
As a notification unit, the subject may be notified of the subcutaneous fat thickness by voice, parameter display, or the like.

In each embodiment, an exponential function is used as a nonlinear function as a function, but a quadratic function, a cubic function, or the like may be used.
In the second embodiment, the compression spring 31 is used for pressure detection. However, pressure detection may be performed using a strain gauge.

  G4a, G5a, G8a, G8b ... linear regression line as a function, G4b, G5b ... exponential function as a function and nonlinear function, G6 ... nonlinear function, k1 ... first distance, k2 ... second distance, 10a ... as a notification unit Display buttons, 10b... Input buttons as input units, 13... Light emitting elements as light irradiating units, 14... First light receiving elements as first light receiving units, 15. ... Control part, 17 ... Database part, 20 ... Living body, 32 ... Pressure detection part.

Claims (4)

A light irradiation unit for irradiating light toward the surface of the living body;
A light receiving unit that receives light propagating through the living body;
A database unit that correlates a light receiving parameter value obtained based on the amount of light received by the light receiving unit and a value of subcutaneous fat thickness at each part of the living body, and stores a function shared by each part of the living body; ,
A control unit that estimates the value of the subcutaneous fat thickness with reference to the function of the database unit based on the light reception parameter value;
One input unit for instructing the control unit to start measurement of the subcutaneous fat thickness;
A notification unit that notifies the subject of the value of subcutaneous fat thickness estimated by the control unit ,
The function optical subcutaneous fat thickness measuring apparatus according to claim exponential der Rukoto the inclination becomes larger as the light receiving parameter value increases. The light receiving parameter value is separated from the light emitting unit by a first received light amount at a first light receiving unit provided at a position separated from the light emitting unit by a first distance and a second distance longer than the first distance. The optical subcutaneous fat thickness measuring apparatus according to claim 1, wherein the optical subcutaneous fat thickness measuring apparatus is a relative ratio to a second received light amount at a second light receiving unit provided at a predetermined position. The database unit stores a plurality of functions having different coefficients depending on the light reception parameter value, and the control unit selects one of the plurality of functions based on the light reception parameter value to estimate the subcutaneous fat thickness. The optical subcutaneous fat thickness measuring apparatus according to claim 1 or 2 . When the light irradiation unit is pressed against the surface of the living body, the apparatus further includes a pressure detection unit that detects a pressure applied to the surface of the living body, and the control unit detects a pressure equal to or higher than a predetermined value by the pressure detection unit. The optical subcutaneous fat thickness measurement apparatus according to any one of claims 1 to 3 , wherein the light irradiation unit is irradiated with light when triggered by this fact .

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