JP2019070550A - Fat measurement device - Google Patents

Abstract

To provide a fat measurement device that is able to accurately measure a numerical value relating to fat of an object.SOLUTION: A fat measurement device 1 comprises: a head unit 3 that includes a first light-emission diode part 9a having a center wavelength of a light emission spectrum in a range of 920 nm to 940 nm, inclusive, and a second light-emission diode part 11a having a center wavelength of a light-emission spectrum, shorter than that of the first light emission diode part and that emits radiation light to an object S, the radiation light being obtained by combining light generated by the first light-emission diode part and light generated by the second light-emission diode part; a spectrometer 5a that separates measurement light that has occurred in the object; an optical detector 5b that detects the measurement light separated by the spectrometer and outputs spectral data about the measurement light; and a control device 5c that calculates information about a numerical value on the basis of the spectral data. The second light-emission diode part is configured to generate light the intensity of which is lower than the intensity of light generated by the first light-emission diode part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fat measuring device that measures a value related to fat of an object.

  Conventionally, there is known an apparatus for measuring the value of fat of an object by using light absorption by fat. For example, in Patent Document 1 below, the tuna is irradiated with light using a halogen lamp, the diffuse reflection light generated from the inside of the tuna is received accordingly, and the fat is estimated by analyzing the received diffuse reflection light. An apparatus for calculating the quantity is described.

Japanese Patent Application Publication No. 2003-270139

  It is known that absorption of light by fat generally occurs in a wavelength band of 920 to 940 nm centered around 927 nm. On the other hand, in the wavelength near 956 nm near the wavelength region, the influence of light absorption by water appears prominently. As a result, since the halogen lamp is used in the apparatus described in the above-mentioned non-patent document 1, it is susceptible to the absorption of light by water in the result of the spectroscopic analysis. Therefore, it has tended to be difficult to accurately measure the value of fat.

  Then, this invention is made in view of this subject, and makes it a subject to provide a fat measuring device which can measure a numerical value about a fat of a subject precisely.

  In order to solve the above-mentioned problems, the present inventors have found the following facts as a result of earnest research.

  The waveform pattern of the emission spectrum of the irradiation light with which the object is irradiated is variously changed, and the spectrum of the measurement light diffused and reflected in the object is observed accordingly. It turned out that the degree of reflection changes a lot. At this time, the reason that the degree of reflection of numerical values regarding fat is relatively high is that the peak wavelength is in the wavelength band where absorption of light by fat occurs, and in the region longer than the peak wavelength, the wavelength is shorter than the peak wavelength It has been newly found that the case of using an irradiation light having an emission spectrum which changes more sharply than the region of. Based on this fact, the present inventors have conceived of the configuration of the following aspect.

  One aspect of the present invention is a fat measuring device for measuring a numerical value related to fat of an object, comprising: a first light emitting diode having a central wavelength of emission spectrum in a range of 920 nm to 940 nm; and a first light emitting diode Light emitted from the first light emitting diode portion and light generated from the second light emitting diode portion, the second light emitting diode portion having the central wavelength of the light emission spectrum shorter than the central wavelength of the light emission spectrum of the portion; A light irradiator that synthesizes and irradiates an object as irradiation light, a spectrometer that disperses measurement light generated in response to irradiation of irradiation light in the object, and measurement light that is dispersed by the spectrometer is detected and measured A second light emitting diode unit including a light detector for outputting spectrum data on light and an operation unit for calculating information on numerical values based on the spectrum data; Intensity of light formed is configured to be smaller than the intensity of the light first light emitting diode unit is produced.

  In the fat measurement device according to the above aspect, the light irradiation section has a peak wavelength in a wavelength band where absorption of light by fat occurs, and in a region longer than the peak wavelength, the peak wavelength is shorter than the peak wavelength. Irradiated light having an emission spectrum that changes more sharply than the region is irradiated toward the object. Then, the measurement light generated in the object according to the irradiation of the irradiation light is separated by the spectroscope, the measurement light separated is detected by the light detector, and spectrum data on the measurement light is output, and the calculation unit Information on the value of fat is calculated based on the spectral data. As a result, numerical information on fat is greatly reflected, and information on the numerical value of fat is calculated using spectral data that is less affected by light absorption by water. As a result, it is possible to accurately and stably obtain information on the numerical value of the fat of the object.

  In the one aspect described above, it is preferable that the operation unit performs first-order differentiation on the spectrum data to calculate first-order differential data, and calculates information on numerical values based on the first-order differential data. In this case, by using the first derivative data of the spectral data, it is possible to improve the prediction accuracy regarding the numerical value of fat to be measured, and additionally, it is possible to reduce an error due to the influence of light absorption by water.

  In addition, it is also preferable that the calculation unit calculates second derivative data by secondarily differentiating the spectrum data, and calculates information on numerical values based on the second derivative data. In this case, by using the second derivative data of the spectrum data, it is possible to enhance the prediction accuracy regarding the numerical value of fat to be measured, and additionally, it is possible to reduce an error due to the influence of light absorption by water.

  Furthermore, the control unit further controls the irradiation of the irradiation light by the light irradiation unit, and the control unit is configured such that the intensity of the light generated by the second light emitting diode unit is higher than the intensity of the light generated by the first light emitting diode unit It is also preferable to control at least one of the first light emitting diode unit and the second light emitting diode unit so as to be smaller. Such a configuration has a peak wavelength in the wavelength band where absorption of light by fat occurs, and in the region longer than the peak wavelength, the emission spectrum changes more sharply than the region shorter than the peak wavelength. It can be irradiated with the irradiation light. As a result, it is possible to obtain spectral data which is largely reflected in fat values and which is less affected by light absorption by water.

  Furthermore, the first light emitting diode portion has n (n is an integer of 1 or more) light emitting diode elements, and the second light emitting diode portion is m (m is an integer of 1 or more) light emitting diodes It is also preferred to have elements and n> m. With this configuration as well, numerical values relating to fat can be largely reflected, and spectral data with less influence of light absorption by water can be obtained.

  Furthermore, the second light emitting diode portion has a light reducing filter for reducing light generated from the second light emitting diode portion, and the light reducing filter has an intensity of light generated by the second light emitting diode portion. It is also preferable to dim the light generated from the second light emitting diode portion so as to be smaller than the intensity of the light generated by the first light emitting diode portion. With this configuration as well, numerical values relating to fat can be largely reflected, and spectral data with less influence of light absorption by water can be obtained.

  In addition, information on numerical values may be at least one of fat mass and fat percentage.

  According to one aspect of the present invention, it is possible to accurately measure the numerical value of the fat of the object.

It is a schematic block diagram of the fat measurement device concerning an embodiment. It is the top view which looked at the surface 3a side to which the head part 3 of FIG. It is a graph which shows the emission spectrum of the illumination light irradiated from the head part 3 of FIG. It is a graph which shows an example of wavelength distribution of the secondary differential value calculated by the calculating part 5e of FIG. It is a graph which shows the emission spectrum of the irradiated light in embodiment and a comparative example. It is a graph which shows a fat mass conversion value computed by a plurality of measurements in an embodiment and a comparative example. It is a graph which shows the standard deviation of the amount conversion value of fats computed by five measurements in an embodiment and a comparative example. It is the top view seen from the surface 3a side to which the head part 3A concerning a modification adheres to the target object S side. It is a perspective view which shows the structure of the integrated type light source device concerning a modification.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description, the same elements or elements having the same function will be denoted by the same reference symbols, without redundant description.

  FIG. 1 is a schematic block diagram of a fat measuring device according to a preferred embodiment. The fat measuring device 1 shown in FIG. 1 is a device for measuring the amount of fat, the fat percentage and the like as numerical values related to the fat of an object S such as a human body, and the head portion 3, the main device 5, and the head portion 3) and a cable 7 for connecting the main unit 5 with the main unit 5. The head unit 3 irradiates the illumination light to the object S by being in close contact with the object S, receives the measurement light including the reflected light and the scattered light generated in the object S according to it, and measures the measurement light The light is guided inside the main unit 5 via the cable 7. That is, an optical cable 7a inserted inside the cable 7 is provided between the surface of the head unit 3 on the side of the object S and the inside of the main unit 5, and the measurement from the object S is performed by the optical cable 7a. Light is guided inside the main device 5. In addition, a cable (not shown) for electrically connecting the head unit 3 and the main device 5 is also inserted into the cable 7. In addition, as object S which is a measurement object of fat measuring device 1, other than a human body, it may be various kinds of animals and plants, or a part of those tissues.

  FIG. 2 is a plan view of the head unit 3 as viewed from the surface 3 a side in close contact with the object S. The head portion 3 has a substantially cylindrical shape, and incorporates the four first light emitting diode elements 9a and the two second light emitting diode elements 11a in a state capable of emitting light from the surface 3a to the outside. ing. Furthermore, a hole 13 is provided at the center of the surface 3 a of the head 3, and the end of the optical cable 7 a is disposed inside the hole 13. With such a structure, the measurement light of the object S is incident from the end of the optical cable 7a.

  The first light emitting diode element 9 a is an LED (Light Emitting Diode) having a central wavelength of an emission spectrum in a wavelength range of 920 nm to 940 nm. For example, the central wavelength of the emission spectrum of the first light emitting diode element 9a is 930 nm. The four first light emitting diode elements 9a constitute a first light emitting diode portion 9 which emits light of a central wavelength within a wavelength band in which absorption of light by fat is likely to occur.

  The second light emitting diode element 11a is an LED having a central wavelength of an emission spectrum shorter than the central wavelength of the emission spectrum of the first light emitting diode element 9a. For example, the central wavelength of the emission spectrum of the second light emitting diode element 11a is 875 nm. The two second light emitting diode elements 11a constitute the second light emitting diode unit 11 which emits light having a central wavelength shorter than the wavelength band in which absorption of light by fat is likely to occur.

  As described above, the number of the second light emitting diode elements 11 a configuring the second light emitting diode unit 11 is smaller than the number of the first light emitting diode elements 9 a configuring the first light emitting diode unit 9. Further, the light emission intensities of the respective second light emitting diode elements 11 a and the respective first light emitting diode elements 9 a are set to be the same. Therefore, the intensity of the light generated by the entire second light emitting diode unit 11 is set to be smaller than the intensity of the light generated by the entire first light emitting diode unit 9. Here, the number n of the first light emitting diode elements 9a (n is an integer of 1 or more) and the number m of the second light emitting diode elements 11a (m is an integer of 1 or more) is not limited to a specific number. If it is> m, various numbers can be set.

  The head unit 3 incorporating the first light emitting diode unit 9 and the second light emitting diode unit 11 combines the light generated from the first light emitting diode unit 9 and the light generated from the second light emitting diode unit 11. The object S can be irradiated. In general, fatty acids have the property of absorbing light at around 927 nm, and also have the property of slightly changing the absorption band due to the difference in the geometrical structure of the CH chain-like portion on the molecular structure. The illumination light emitted from the head portion 3 in this manner has a peak wavelength in a wavelength band of 920 to 940 nm (hereinafter referred to as "fat absorption band") in which absorption of light by fat is likely to occur, and In a region longer than the peak wavelength, it has an emission spectrum which changes more sharply than the region shorter than the peak wavelength.

  FIG. 3 shows a characteristic graph SP1 of the emission spectrum of the illumination light emitted from the head unit 3 in comparison with a characteristic graph SP0 of the emission spectrum of the light emitted from a general halogen lamp. Thus, the emission spectrum of the light emitted from the halogen lamp has a peak at a wavelength 100 nm or more shorter than the absorption band of fat, and extends over a wide wavelength range from 490 nm to 1100 nm. On the other hand, the emission spectrum of the illumination light emitted from the head portion 3 has a peak near 930 nm included in the absorption band of fat, and the long wavelength side of the peak wavelength changes sharply, and the peak wavelength is short The wavelength side changes gently compared to the long wavelength side. As described later, the calculation of the information on the numerical value of fat by the fat measurement device 1 is performed by differentiating the spectrum data of the measurement light generated in the object S in response to the illumination of the illumination light. The characteristic of the illumination light as described above is a wavelength range that affects the calculation result of the numerical value of fat by differential calculation, in a wavelength range W1 of about 870 to about 970 nm including the absorption band of fat and its adjacent wavelength band. The emission intensity is distributed efficiently. In addition, the characteristic of the illumination light changes sharply at the boundary on the long wavelength side of the wavelength region W1, so that the light emission intensity is sufficiently small near 956 nm where light absorption by water occurs.

  Returning to FIG. 1, the internal configuration of the main device 5 will be described.

  The main device 5 incorporates a spectroscope 5a, a photodetector 5b, and a control device 5c. The spectroscope 5a is optically connected to the end of the optical cable 7a, and the measurement light incident from the object S via the head portion 3 and the cable 7 is divided into a plurality of wavelength components by a prism, a diffraction grating, or the like. To separate. The photodetector 5b is optically connected to the output of the spectroscope 5a, and uses a plurality of wavelength components of the measurement light separated by the spectroscope 5a using a sensor such as a line sensor, a photodiode array, or an image sensor. By performing detection, spectral data indicating the distribution of the intensity of the measurement light for each wavelength is generated. The photodetector 5b is electrically connected to the control device 5c, and outputs the generated spectrum data to the control device 5c. As the light detector 5b, for example, one having detection sensitivity in a wavelength range of 600 nm to 1000 nm is used.

  The control device 5c of the main body device 5 is configured to include a control unit 5d and an operation unit 5e as functional components. The control device 5c physically includes a central processing unit (CPU), a random access memory (RAM) or a read only memory (ROM) 103 as a recording medium, and a communication module. Each functional unit of the control device 5c stores programs in advance on hardware such as a CPU and a RAM to operate a communication module and the like under the control of the CPU and read and write data in the RAM. , And by reading data from the ROM. The control device 5c is connected in data communication with an external computer 15 provided with a main body 15a, a display 15b such as a display, and an input unit 15c such as a keyboard and a mouse.

  The control unit 5 d of the control device 5 c controls the execution of the measurement process by the fat measuring device 1 and controls the irradiation of the illumination light in the head unit 3. That is, in response to the reception of the instruction input from the external computer 15, the measurement process is started, and the irradiation of the illumination light in the head unit 3 is started. The control device 5c is electrically connected to the first light emitting diode unit 9 and the second light emitting diode unit 11 of the head unit 3 via a cable, and the first light emitting diode unit 9 and the second light emitting diode unit 9 are controlled according to the control of the control unit 5d. Power is supplied to the second light emitting diode unit 11. At this time, the control device 5c supplies power so that the light emission intensities of the respective second light emitting diode elements 11a and the respective first light emitting diode elements 9a become the same.

  The calculation unit 5e of the control device 5c calculates numerical value information on fat of the object S based on the spectrum data output from the light detector 5b in accordance with control of execution of measurement processing by the control unit 5d. Information of the calculated numerical value is transmitted to the external computer 15, and displayed (output) on the display unit 15b.

  In detail, the computing unit 5e performs second derivative of the spectrum data with respect to the wavelength to calculate a wavelength distribution of second derivative values. FIG. 4 is a graph showing an example of the wavelength distribution of the second derivative value calculated by the calculation unit 5e. In this graph, the wavelength distribution R1 of the second derivative value calculated for the object S having a relatively small amount of fat and the second derivative value calculated for the object S having a relatively large amount of fat A wavelength distribution R3 and a wavelength distribution R2 of second-order derivative values calculated for an object S having an intermediate value of fat mass are shown. Thus, in the wavelength range from around 830 nm to around 950 nm, the second-order derivative value changes relatively largely depending on the fat amount.

Then, the calculation unit 5e calculates the representative value x1 of the second derivative of the wavelength band Δλ1 near 850 nm, the representative value x2 of the second derivative of the wavelength band Δλ2 near 920 nm, and the second order of the wavelength band Δλ3 near 950 nm. The representative value x3 of the differential value is determined, and based on these representative values x1, x2, x3, the following formula (1);
f (x) = a x 1 + b x 2 + c x 3 + d (1)
Calculate information on the numerical value of fat by using Here, in the above equation (1), a, b, c and d are operation coefficients calculated in advance by regression operation and stored in the control device 5c. At this time, the computing unit 5e may obtain, as representative values x1, x2 and x3, an average value of secondary differential values of the respective wavelength bands Δλ1, Δλ2 and Δλ3 or may obtain a maximum value or a minimum value. Alternatively, the value of the central wavelength of each wavelength band may be determined. The information on the numerical value of fat calculated by the calculation unit 5e may be information on fat mass, information on a fat percentage, or both of them. By using the equation (1), it is possible to obtain information on the numerical value of fat based on the optical characteristic values x1, x2, x3 which change according to the fat mass. In addition, the number of representative values used for calculation of the information regarding the numerical value of fat mass may be changed suitably, and the range of a wavelength range may also be changed suitably.

  Here, the operation coefficients a, b, c, d stored in the control device 5c are acquired as follows. First, the fat amount of the object S is obtained in advance by chemical analysis such as Soxhlet method. Next, by measuring the object S by the fat measuring device 1, the wavelength distribution of the second derivative value is calculated based on the spectrum data. Then, calculation coefficients a, b, c, d are obtained by regression analysis of fat mass data by chemical analysis and data of wavelength distribution of second derivative using an external computer 15 or the like, and the control device 5c Remember inside. Regression analysis is performed by correlating data of fat mass by chemical analysis with data of wavelength distribution of second derivative values by multiple regression analysis, PLS analysis or the like.

  According to the fat measuring device 1 configured as described above, the head portion 3 has a peak wavelength in the fat absorption band, and in a region longer than the peak wavelength, a region shorter than the peak wavelength than the peak wavelength Irradiated light having an emission spectrum that changes sharply is emitted toward the object S. Then, the measuring light generated in the object S in response to the irradiation of the irradiation light is dispersed by the spectroscope 5a in the main body device 5, and the separated measuring light is detected by the light detector 5b in the main body device 5. Spectrum data on the measurement light is output. Further, the computing unit 5e in the main unit 5 calculates information on the numerical value of fat based on the spectrum data. As a result, numerical information on fat is greatly reflected, and information on the numerical value of fat is calculated using spectral data that is less affected by light absorption by water. As a result, it is possible to stably and accurately obtain information on the numerical value of the fat of the object S.

  That is, when a conventional light source such as a halogen lamp or a xenon lamp is used to measure fat, the emission spectrum of the irradiated light is relatively flat, so when observing the optical response to fat, it is efficient It becomes difficult to observe the response. That is, the absorption response pattern of fat can not be dynamically reflected in the observed spectral data. In particular, this tendency is remarkable when trying to measure fat stably by differentiating spectral data. According to this embodiment, since the irradiation light having the emission spectrum in the absorption band of fat and its adjacent wavelength band is used, the optical response to fat can be efficiently observed. In addition, the emission spectrum of the irradiation light has a sufficiently low emission intensity near the wavelength at which the absorption of light by water occurs. Therefore, it is possible to reduce the influence of the absorption of light by water in the result of the differential calculation of the spectral data, and to improve the calculation accuracy of the information related to the numerical value of fat.

  Furthermore, in the present embodiment, since the light emitting diode element is used as the light irradiation part, downsizing and reduction of power consumption are facilitated compared to a halogen lamp, a xenon lamp, etc. An emission spectrum suitable for measurement can be easily realized by a combination of a plurality of light emitting diode elements.

  Further, the computing unit 5e of the present embodiment performs second derivative of spectrum data to calculate second derivative data, and calculates information related to numerical values based on the second derivative data. Thus, the prediction accuracy regarding the numerical value of fat measured can be raised by using the second derivative data of spectrum data, and in addition, the error by the influence of absorption of light by water can also be reduced.

  Next, an example of the calculation result of the information related to the numerical value of fat in the present embodiment is shown in comparison with the comparative example.

  FIG. 5 is a graph showing the emission spectrum of the irradiation light in the present example and the emission spectrum of the irradiation light of the comparative example. In FIG. 5, the characteristic graph SP0 shows the emission spectrum of the light emitted from the halogen lamp, the characteristic graph SP1 shows the emission spectrum of the irradiation light of this embodiment, and the characteristic graph SP2 shows the emission spectrum of the comparative example. The emission spectrum is shown. The difference in configuration from the present embodiment in the comparative example is that the number of first light emitting diode elements 9a incorporated in the head unit 3 is set to two, the same number as the number of second light emitting diode elements 11a. . In the emission spectrum of the irradiation light of such a comparative example, the peak is shifted to the short wavelength side compared to the embodiment due to the decrease in the emission intensity on the long wavelength side, and the light intensity is on the long wavelength side and the short wavelength side Rate of change is equal.

  6 and 7 show the results of measuring the object in the present embodiment and the comparative example. FIG. 6 shows a fat mass conversion value calculated by a plurality of measurements. In the first to fifth measurements, the target having a relatively small amount of fat is targeted, and the number of measurements is seventh to eleventh In the case of the target in which the fat mass has an intermediate value is targeted, and in the thirteenth to the seventh counts, the target having a relatively large fat mass is targeted. FIG. 7 shows the standard deviation of the fat mass conversion value when measured five times for each of the objects 1 to 3; the object 1 has a relatively small amount of fat, and the object 2 has a fat The amount is an intermediate value, and the object 3 has a relatively large amount of fat.

  From these results, it can be seen that the measurement results in the comparative example show variations and lack of stability. In particular, the variation in measurement results of objects having relatively large amounts of fat and objects having relatively small amounts of fat is large. In contrast to this, in the present embodiment, stable measurement results are obtained among a plurality of measurements.

  As mentioned above, although various embodiment of this invention was described, this invention is not limited to the said embodiment, It deform | transformed in the range which does not change the summary described in each claim, or it applied to the other thing It may be one.

  In the fat measuring device 1 of the above embodiment, the computing unit 5e performs second derivative of the spectrum data to calculate second derivative data, and based on that, calculates information on the numerical value of fat. First derivative with respect to frequency may be calculated to calculate first derivative data, and based on that, information on a numerical value of fat may be calculated. By using the first derivative data of the spectral data, it is possible to improve the prediction accuracy regarding the numerical value of fat to be measured, and in addition, it is possible to reduce an error due to the influence of light absorption by water.

  Further, in the fat measuring device 1 of the above embodiment, the control unit 5d supplies power so that the light emission intensities of the respective second light emitting diode elements 11a and the respective first light emitting diode elements 9a become the same. The feeding may be controlled such that the intensity of the light generated by the second light emitting diode unit 11 is smaller than the intensity of the light generated by the first light emitting diode unit 9. At this time, it is sufficient that the control unit 5d can relatively control the intensities of both lights, and the second light emitting diode element 11a of the second light emitting diode unit 11 and the first light emitting diode element 9a of the first light emitting diode unit 9 At least one of the power supplies may be controlled. With such a configuration, irradiation is performed with irradiation light having a peak wavelength in the fat absorption band and having an emission spectrum that changes more sharply than the peak wavelength in a region longer than the peak wavelength than the peak wavelength. It is made possible. In this case, the number of first light emitting diode elements 9a does not necessarily have to be larger than the number of second light emitting diode elements 11a, and the number of first light emitting diode elements 9a is equal to or less than the number of second light emitting diode elements 11a. May be

  Moreover, you may change the head part 3 of the fat measuring device 1 of the said embodiment into a structure as shown in FIG. That is, as in the head section 3A shown in FIG. 8, an ND filter for reducing the light emitted from the second light emitting diode element 11a on the surface 3a of the front surface of the second light emitting diode element 11a of the second light emitting diode section 11. A neutral density filter 17 may be provided. Even with such a configuration, the intensity of the light generated by the second light emitting diode unit 11 can be smaller than the intensity of the light generated by the first light emitting diode unit 9. As a result, it is possible to emit irradiation light having a peak wavelength in the fat absorption band and having an emission spectrum that changes more sharply than the peak wavelength than the peak wavelength in a region longer than the peak wavelength. Ru. In this case, the number of first light emitting diode elements 9a does not necessarily have to be larger than the number of second light emitting diode elements 11a, and the number of first light emitting diode elements 9a is equal to or less than the number of second light emitting diode elements 11a. May be

Further, an integrated light source device as shown in FIG. 9 may be incorporated in the head portion 3 of the fat measuring device of the above embodiment. FIG. 9 is a perspective view showing a configuration example of a light source device 19 according to a modification. The light source device 19 has a configuration in which _three light emitting elements 91 _{1 to} 91 ₃ are flip chip mounted on a substrate 90. Each light emitting element 91 _k (k = 1, 2, 3) can output irradiation light of a wavelength different from each other. For example, two of the light emitting elements 91 _k have the same center as the first light emitting diode element 9 a. The light of the wavelength is output, and one of the light emitting elements 91 _k outputs the light of the same center wavelength as the second light emitting diode element 11 a. Each light emitting element 91 _k is, for example, an LED (light emitting diode). One electrode terminal of each light emitting element 91 _k is electrically connected to the wiring W _k1 on the substrate 90. The other electrode terminal of each light emitting element 91 _k is electrically connected to the wiring W _k2 on the substrate 90. The distance between the _three light emitting elements 91 _{1 to} 91 3 on the substrate 90 is preferably short, for example, the distance can be 1 mm or less.

Further, the light source device 19 is provided with a light source drive circuit (not shown). The light source drive circuit can control the light emission of each light emitting element 91 _k under the control of the control unit 5 d of the main body device 5. The light source drive circuit controlled by the control unit 5 d targets the wiring set of the wiring set W ₁₁ , W ₁₂ , the wiring set W ₂₁ , W ₂₂ , and the wiring set W ₃₁ , W ₃₂ , and their wiring W _k1 , And W _k2 simultaneously, irradiation light can be simultaneously output from the light emitting elements 91 _k connected to the wirings W _k1 and W _k2 .

Provided lens as the light output side of the light source device 19 to cover the light-emitting element 91 _{1-91 3,} preferably suppress the divergence of the illumination light by the lens. The lens is formed of, for example, a resin, and may be integral with the substrate 90 and the light emitting elements 91 _{1 to} 91 ₃ or may be separate from these.

  In the above embodiment, the spectroscope 5 a and the light detector 5 b may be built in the head unit 3, and the head unit 3 and the main unit 5 may only be electrically connected by a cable. Conversely, the light source device may be incorporated in the main body device 5, and the irradiation light emitted from the light source device may be guided to the head unit 3 via the optical cable in the cable 7.

  In the above embodiment, some functions of the main device 5 may be realized by a smart device such as a smartphone or a tablet terminal.

S: target object 1: fat measuring device 3, 3 A: head portion (light irradiation portion) 5: main body device 5a: spectroscope 5b: light detector 5c: control device 5d: control portion 5e ... Arithmetic unit, 7 ... Cable, 9 ... 1st light emitting diode part, 9a ... 1st light emitting diode element, 11 ... 2nd light emitting diode part, 11a ... 2nd light emitting diode element, 17 ... attenuation filter, 19 ... light source device , 91 ₁ , 91 ₂ , 91 ₃ ... light emitting elements.

Claims (7)

A fat measuring device for measuring a numerical value related to fat of an object,
A first light emitting diode having a central wavelength of emission spectrum in a range of 920 nm to 940 nm and a second light emitting diode having a central wavelength of emission spectrum shorter than the central wavelength of the emission spectrum of the first light emitting diode A light irradiator including a light emitting portion that combines the light generated from the first light emitting diode portion and the light generated from the second light emitting diode portion and irradiates the target with light as irradiation light;
A spectroscope which disperses measurement light generated in response to the irradiation of the irradiation light in the object;
A photodetector that detects the measurement light separated by the spectrometer and outputs spectral data related to the measurement light;
An arithmetic unit that calculates information related to the numerical value based on the spectral data;
The intensity of the light generated by the second light emitting diode unit is configured to be smaller than the intensity of the light generated by the first light emitting diode unit.
Fat measuring device. The calculation unit performs first derivative of the spectrum data to calculate first derivative data, and calculates information related to the numerical value based on the first derivative data.
The fat measuring device according to claim 1. The calculation unit calculates second derivative data by secondarily differentiating the spectrum data, and calculates information on the numerical value based on the second derivative data.
The fat measuring device according to claim 1. It further comprises a control unit that controls the irradiation of the irradiation light by the light irradiation unit,
The control unit controls the first light emitting diode unit and the second light emitting diode unit such that the intensity of light generated by the second light emitting diode unit is smaller than the intensity of light generated by the first light emitting diode unit. Control at least one of the light emitting diode sections of
The fat measurement device according to any one of claims 1 to 3. The first light emitting diode portion includes n (n is an integer of 1 or more) light emitting diode elements.
The second light emitting diode portion includes m (m is an integer of 1 or more) light emitting diode elements.
n> m,
The fat measurement device according to any one of claims 1 to 3. The second light emitting diode part has a light reduction filter for reducing light generated from the second light emitting diode part,
The light reduction filter is generated from the second light emitting diode unit such that the intensity of the light generated by the second light emitting diode unit is smaller than the intensity of the light generated by the first light emitting diode unit. Dim light,
The fat measurement device according to any one of claims 1 to 3. The information on the numerical value is at least one of fat mass and fat percentage,
The fat measurement device according to any one of claims 1 to 6.

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