Biometric sensor and method for determining biological condition

Abstract

Provided is a biological sensor that can easily differentiate the state of a living body.　A biological sensor according to the present technology is provided with: an irradiation system that irradiates a living body with irradiation light including light that has a wavelength in a wavelength band including a peak wavelength regarding water absorption; a light reception system that individually receives light beams each having a wavelength in the wavelength band among a plurality of light beams emitted from the irradiation system and reflected at a plurality of portions of the living body; and a processing system that differentiates the state of the living body on the basis of a plurality of statistics regarding signals from the respective portions and outputted from the light reception system.

Description

[Technical field]

[0001] The technology according to the present disclosure (hereinafter also referred to as "the technology") relates to a biosensor and a method for determining a biological condition. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there is known an inspection method in which a living body is irradiated with light, and the reflected light from the living body is imaged to visualize the water distribution of the living body (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-184555 Summary of the Invention [Problem to be solved by the invention]

[0004] However, even when using conventional testing methods, it is difficult to easily determine the state of a living body.

[0005] Therefore, a main object of the present technology is to provide a biological sensor and a biological condition determining method that can easily determine the state of a living body. [Means for solving the problem]

[0006] The present technology includes an irradiation system that irradiates a living body with irradiation light including light having a wavelength within a wavelength band including a peak wavelength related to water absorption; a light receiving system that receives light having a wavelength within the wavelength band from the light irradiated from the irradiating system and reflected by each of the plurality of parts of the living body; a processing system that determines a state of the living body based on statistics regarding the signals for each part output from the light receiving system; The present invention provides a biosensor comprising: The processing system may determine the state of the living body by using a first distribution which is a distribution of the number of signals for each signal value of the signals for each part. The processing system may determine a state of the living body from a feature amount of the first distribution. The feature amount of the first distribution may be the number of signals whose signal values ​​for each of the parts are equal to or less than a reference value. The reference value may be an average value of the signal values ​​of the signals for each of the sites. The feature amount of the first distribution may be a median, an average, or a mode of the signal values ​​of the signals for each of the parts. The processing system may further use a second distribution, which is a distribution of the number of signals for each signal value of the signals for each of the multiple parts according to the reflectance distribution of the multiple parts themselves, to determine the state of the living body. The processing system may compare feature amounts of the first and second distributions to determine the state of the living body. The feature amount of the second distribution may be a feature amount corresponding to the feature amount of the first distribution. The feature of the first distribution may be a ratio of the number of signals in the first distribution for each part whose signal values ​​match each of a plurality of values, and the feature of the second distribution may be a ratio of the number of signals in the second distribution for each part whose signal values ​​match each of the plurality of values. The light receiving system may include a light receiving element array including a plurality of light receiving elements respectively corresponding to the plurality of sites, and an optical system corresponding to the plurality of light receiving elements, and the optical system may guide light having a wavelength within the wavelength band among the light irradiated from the irradiation system and reflected at each of the plurality of sites to the light receiving element corresponding to that site. The illumination light may include only light with wavelengths within the wavelength band, and the optical system may have an optical member that guides light with wavelengths within the wavelength band that is illuminated from the illumination system and reflected at the corresponding site to the corresponding light receiving element. The illumination light may include light with wavelengths within the wavelength band and light with wavelengths outside the wavelength band, and the optical system may have a wavelength selection filter that selectively passes light with wavelengths within the wavelength band from the light irradiated from the illumination system and reflected at each of the multiple sites. The optical system may include an optical member that guides light having a wavelength within the wavelength band that has passed through the wavelength selection filter to a corresponding light receiving element. The optical system may include an optical member that guides light having a wavelength within the wavelength band to a corresponding light receiving element via the wavelength selection filter. The illumination system may include a light source that emits light of a wavelength within the wavelength band and light of a wavelength outside the wavelength band, and a wavelength selective filter that selectively passes light within the wavelength band among the light within the wavelength band and the light outside the wavelength band emitted from the light source. The optical system may include an optical member that guides light having a wavelength within the wavelength band that has passed through the wavelength selection filter and been reflected at the corresponding portion to a corresponding light receiving element. The illumination system may include at least one light source that is disposed between two adjacent light receiving elements of the plurality of light receiving elements and that emits light including light with a wavelength within the wavelength band. The illumination system may further include a light guide plate disposed between the optical system and the living body, the illumination system including a light source that emits light including light with wavelengths within the wavelength band, and the light guide plate may guide at least light with wavelengths within the wavelength band among the light emitted from the light source, and cause the light within the wavelength band to be incident on each of the plurality of sites. The light guide plate may be transparent to light with wavelengths within the wavelength band. The light guide plate may have a plurality of diffraction sections on the optical system side corresponding to the plurality of light receiving elements, respectively, and each of the plurality of diffraction sections may diffract incident light of a wavelength within the wavelength band toward the corresponding portion. The apparatus may further include a circular polarizer disposed between the light receiving element array and the living body. The state of the living body may be a mental state estimated from the sweating state of each of the body parts. This technology is Irradiating a living body with irradiation light including light having a wavelength within a wavelength band including a peak wavelength related to water absorption; a step of receiving light having a wavelength within the wavelength band from the light irradiated from the irradiation system and reflected by each of the multiple sites of the living body, and outputting a signal for each of the sites; determining a state of the living body based on statistics regarding the signals for each part output in the outputting step; A biological condition determination method is also provided, which includes the steps of: [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram illustrating a schematic configuration of a biosensor according to Example 1 of an embodiment of the present technology. [Diagram 2] 1 is a block diagram showing an example of functions of a biosensor according to Example 1 of an embodiment of the present technology. FIG. [Diagram 3] 1 is a graph showing a first distribution and a second distribution. [Figure 4] FIG. 3 is a diagram showing the average values ​​of the signal values ​​of the first distribution and the second distribution. [Diagram 5] FIG. 3 is a diagram showing the medians of the signal values ​​of the first distribution and the second distribution. [Figure 6] FIG. 3 is a diagram showing the most frequent values ​​of the signal values ​​of the first distribution and the second distribution. [Figure 7] 1 is a flowchart for explaining a biological condition determining process 1. [Figure 8] FIG. 11 is a block diagram showing an example of functions of a biosensor according to a modified example of Example 1 of an embodiment of the present technology. [Figure 9] 13 is a flowchart for explaining a biological condition determining process 2. [Figure 10] FIG. 11 is a diagram illustrating a schematic configuration of a biosensor according to Example 2 of an embodiment of the present technology. [Figure 11] FIG. 11 is a diagram illustrating a schematic configuration of a biosensor according to Example 3 of an embodiment of the present technology. [Figure 12] FIG. 11 is a diagram illustrating a schematic configuration of a biosensor according to Example 4 of an embodiment of the present technology. [Figure 13]11 is a diagram illustrating a schematic configuration of a biosensor according to Example 5 of an embodiment of the present technology. FIG. [Figure 14] FIG. 13 is a diagram illustrating a schematic configuration of a biosensor according to Example 6 of an embodiment of the present technology. [Figure 15] FIG. 13 is a diagram illustrating a schematic configuration of a biosensor according to Example 7 of an embodiment of the present technology. [Figure 16] FIG. 13 is a diagram illustrating a schematic configuration of a biosensor according to Example 8 of an embodiment of the present technology. [Figure 17] FIG. 13 is a diagram illustrating a schematic configuration of a biosensor according to Example 9 of an embodiment of the present technology. [Figure 18] FIG. 23 is a diagram illustrating a schematic configuration of a biosensor according to a tenth example of an embodiment of the present technology. [Figure 19] FIG. 13 is a diagram illustrating a schematic configuration of a biosensor according to an eleventh example of an embodiment of the present technology. [Figure 20] FIG. 23 is a diagram illustrating a schematic configuration of a biosensor according to Example 12 of an embodiment of the present technology. [Figure 21] FIG. 23 is a diagram illustrating a configuration of a biosensor according to Example 13 of an embodiment of the present technology. [Figure 22] FIG. 23 is a diagram illustrating a configuration of a biosensor according to Example 14 of an embodiment of the present technology. [Diagram 23] FIG. 23 is a diagram illustrating a schematic configuration of a biosensor according to Example 15 of an embodiment of the present technology. [Figure 24] FIG. 23 is a diagram illustrating a schematic configuration of a biosensor according to Example 16 of an embodiment of the present technology. [Diagram 25] FIG. 23 is a diagram illustrating a configuration of a biosensor according to Example 17 of an embodiment of the present technology. [Figure 26] FIG. 23 is a diagram illustrating a configuration of a biosensor according to an eighteenth embodiment of the present technology. [Figure 27] FIG. 23 is a diagram illustrating a configuration of a biosensor according to Example 19 of an embodiment of the present technology. [Figure 28] FIG. 13 is a diagram illustrating a schematic configuration of a biosensor according to Example 20 of an embodiment of the present technology. [Figure 29] FIG. 13 is a diagram illustrating a configuration of a biosensor according to a modified example of Example 3 of an embodiment of the present technology. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] A preferred embodiment of the present technology will be described in detail below with reference to the accompanying drawings. In this specification and the drawings, components having substantially the same functional configuration will be denoted by the same reference numerals to avoid repeated description. The embodiment described below shows a representative embodiment of the present technology, and the scope of the present technology will not be interpreted narrowly by this. Even if it is described in this specification that the biosensor and the biological condition determination method according to the present technology each have multiple effects, each of the biosensor and the biological condition determination method according to the present technology may only have at least one effect. The effects described in this specification are merely examples and are not limited, and other effects may also be present.

[0009] The explanation will be given in the following order: 1. Introduction 2. Biosensor according to an embodiment of the present technology 3. Configuration of a biosensor according to Example 1 of an embodiment of the present technology 4. Biometric status determination process 1 5. Effects of the biosensor and the biostatus determination method according to Example 1 of an embodiment of the present technology 6. Configuration of a biosensor according to a modified example of Example 1 of an embodiment of the present technology 7. Biometric status determination process 2 8. Effects of the biosensor according to the modified example of the first embodiment of the present technology 9. Biosensors according to Examples 2 to 20 of an embodiment of the present technology 10. Modifications of this technology

[0010] 1.<Introduction> Conventionally, perspiration measuring devices have been widely used as a means for measuring, for example, a person's mental state. As a perspiration measuring device, for example, a ventilation capsule type measuring device is known, which covers the skin with a capsule and observes the humidity change due to perspiration. As another perspiration measuring device, for example, an electrodermal activity (EDA) measuring device is also used, which electrically measures the phenomenon of perspiration. The EDA measuring device uses the phenomenon in which the impedance and conductance of the skin change as a result of organs such as the eccrine glands of the skin being affected by a person's mental activity. The EDA measuring device is widely used because it can be implemented more simply by attaching two electrodes to the skin than the ventilation capsule type measuring device. However, in both the ventilation capsule type measuring device and the EDA measuring device, the measuring part needs to be in contact with the skin, which causes discomfort when worn. For this reason, these sweat measuring devices are not in widespread use among the general public and are often used in specialized institutions such as hospitals. If sweat measuring devices, which have limitations on the environment in which they can be used, could be used casually (simple) and without discomfort, it is expected that a new product market will expand, such as one that dynamically changes the services provided according to a person's mental state. Therefore, after extensive research, the inventors have developed a non-contact biosensor that can easily determine the state of a living organism (e.g., the human body) (e.g., the mental state estimated from the living organism's sweating state), as described below.

[0011] 2. <Biosensor according to an embodiment of the present technology> Hereinafter, a biosensor according to an embodiment of the present technology will be described. A biosensor according to one embodiment of the present technology is, for example, an optical sensor in which a measuring unit irradiates light onto a surface (e.g., skin) of a living organism (e.g., a human body) and receives reflected light to determine the state of the living organism (e.g., a mental state according to a person's sweating level). More specifically, the biosensor according to one embodiment is a non-contact biosensor in which at least the measuring unit is used in a non-contact state with the living body. The biosensor according to the present technology can be used in a wide variety of forms, such as wearable types that are attached to a living body, such as wristband type, earring type, ring type, necklace type, adhesive type, and supporter type, as well as portable types that are used by holding them over a living body.

[0012] 3.<Configuration of a biosensor according to Example 1 of an embodiment of the present technology> Fig. 1 is a diagram showing a schematic configuration of a biosensor 10-1 according to Example 1 of an embodiment. In Fig. 1, a measurement unit (an irradiation system 100-1 and a light receiving system 200-1, which will be described later) of the biosensor 10-1 is shown in a cross-sectional view. Fig. 2 is a block diagram showing a first functional example of the biosensor 10-1 according to Example 1 of an embodiment. As shown in FIG. 1, a biosensor 10-1 of the first embodiment includes an irradiation system 100-1, a light receiving system 200-1, and a processing system 300-1. The irradiation system 100-1 and the light receiving system 200-1 are, for example, provided integrally. The processing system 300-1 may be provided integrally with the irradiation system 100-1 and the light receiving system 200-1, or may be provided separately. As shown in FIG. 1, the biosensor 10-1 is used in a state where a measurement section made up of an irradiation system 100-1 and a light receiving system 200-1 is not in contact with (eg, in close proximity to) the living body LB. It should be noted that the living body LB includes, for example, the human body as well as the bodies of animals other than humans.

[0013] (irradiation system) The illumination system 100-1 is configured to emit light having a peak wavelength λ P The living body LB (more specifically, the surface of the living body LB) is irradiated with irradiation light IL including light with wavelengths within a wavelength band WB including the wavelengths. Peak wavelength λ for water absorption P is the wavelength at which a peak (maximum value) occurs on a graph showing the absorption spectrum of water (horizontal axis: wavelength, vertical axis: absorbance). The wavelength band WB is, for example, a plurality of (eg, two) wavelength bands in the wavelength range of 1300 nm to 2100 nm, and is a wavelength band in which water has a relatively high absorbency. One of the two wavelength bands WB has a peak wavelength λP1 The first wavelength band WB1 includes, for example, λ P1 -100nm≦WB1≦λ P1 +100 nm is preferable, and λ P1 -50nm≦WB1≦λ P1 More preferably, it is +50 nm. The other of the two wavelength bands WB has a peak wavelength λ P2 The second wavelength band WB2 includes, for example, λ P2 -100nm≦WB2≦λ P2 +100 nm is preferable, and λ P2 -50nm≦WB2≦λ P2 More preferably, it is +50 nm.

[0014] The irradiation system 100-1 includes a light source 110a. The light source 110a is, for example, a halogen lamp, an LED (light emitting diode), a laser, etc. The light emitted by the light source 110a may be visible light or invisible light, but is preferably invisible light (for example, infrared light).

[0015] As an example, as shown in FIG. 1, the light source 110a is positioned with respect to the light receiving system 200-1 so as to emit light from a direction inclined with respect to the surface of the living body LB when the light receiving system 200-1 is directly opposed to the surface of the living body LB.

[0016] The light source 110a emits light having a wavelength within the wavelength band WB and light having a wavelength outside the wavelength band WB. Here, the light emitted from the light source 110a is the illumination light IL. That is, the illumination light IL includes light having a wavelength within the wavelength band WB and light having a wavelength outside the wavelength band WB. The illumination light IL may include light having a wavelength within at least one of the first and second wavelength bands WB1 and WB2. In detail, the illumination light IL may include light of at least one wavelength in the first wavelength band WB1, may include light of at least one wavelength in the second wavelength band WB2, or may include light of at least one wavelength in the first wavelength band WB1 and light of at least one wavelength in the second wavelength band WB2.

[0017] (Light receiving system) Light receiving system 200-1 individually receives light having wavelengths within wavelength band WB from light irradiated from irradiation system 100-1 and reflected from each of a plurality of parts of living body LB. The light receiving system 200-1 includes a light receiving element array 210 including a plurality of (for example) light receiving elements 210a, and an optical system 220-1 corresponding to the plurality of light receiving elements 210a.

[0018] The multiple light receiving elements 210a are arranged in a two-dimensional array, for example. The light receiving elements 210a correspond to the multiple parts (eg, LB1 to LB6) of the living body LB, respectively. Each of the light receiving elements 210a has sensitivity in a wavelength range of, for example, 1400 nm to 2000 nm. Each light receiving element 210a is a pixel sensor made of, for example, InGaAs, PbSe, InSb, etc. In other words, the light receiving element array 210 is an image sensor (area sensor) including a plurality of pixel sensors. For example, a pixel sensor made of relatively inexpensive InGaAs has sensitivity to wavelengths of approximately 1700 nm or less. In this case, it is sufficient that the illumination light IL includes light with wavelengths within the first wavelength band WB1. Each light receiving element 210a photoelectrically converts incident light and outputs an electrical signal. The light receiving element 210a may be, for example, a photodiode (PD) or a phototransistor. The light receiving element is also called, for example, a "light receiver" or an "optical detector".

[0019] (optical system) Optical system 220-1 guides light having wavelengths within wavelength band WB, out of the light irradiated from irradiation system 100-1 and reflected from each of a plurality of parts of living body LB, to light receiving element 210a corresponding to the part. The optical system 220-1 has a lens array 220a (optical member) including a plurality of light receiving lenses 220a1, and a wavelength selection filter 220b. In the optical system 220-1, the lens array 220a is disposed on the light receiving element array 210 side, and the lens array 220a and the wavelength selection filter 220b are disposed adjacent to each other so that the wavelength selection filter 220b is disposed on the living body LB side.

[0020] The wavelength selection filter 220b selectively passes light having a wavelength within the wavelength band WB among the light irradiated from the irradiation system 100-1 and reflected by each of the multiple parts of the living body LB. The wavelength selection filter 220b is, for example, a bandpass filter that has the wavelength band WB as its passband.

[0021] The lens array 220a is disposed on the opposite side of the wavelength selection filter 220b from the living body LB side. The lens array 220a guides the light having wavelengths within the wavelength band WB that have passed through the wavelength selection filter 220b to the corresponding light receiving elements 210a. As an example, the plurality of light receiving lenses 220a1 of the lens array 220a are arranged in a two-dimensional array so as to face the corresponding plurality of light receiving elements 210a. Each light receiving lens 220a1 is a lens that is convex toward the corresponding light receiving element 210a, and collects (preferably forms an image) light from a corresponding site of the living body LB via the wavelength selection filter 220b onto the corresponding light receiving element 210a. That is, only light from a corresponding part of the living body LB is incident on each light receiving element 210a due to the light collecting effect of the corresponding light receiving lens 220a1. Therefore, light from a non-corresponding part of the living body LB is prevented from being incident on each light receiving element 210a (crosstalk).

[0022] (Mechanism of non-contact sweat measurement) As is well known, sweat does not gush out evenly from the surface of a living body, but gushes out discretely from organs on the surface of the living body called sweat glands. Therefore, among the multiple parts of the surface of the living body, the parts with sweat glands have a substantially lower reflectance due to light absorption by water (sweat) compared to parts without sweat glands. This decrease in reflectance is greater for parts with more sweat glands. As the reflectance of each part of the living body decreases, the amount of light reflected from that part decreases, and the amount of light received by the light receiving element corresponding to that part decreases.

[0023] 1, for example, there are two sweat glands in the leftmost part LB1 of the living body LB as viewed from the page, and sweat W flows from these two sweat glands. In this case, the amount of light received by the light receiving element 210a corresponding to this part (signal value of the output signal) is significantly reduced compared to when sweat W does not flow from these two sweat glands. In FIG. 1, there are no sweat glands in the second region LB2, the fourth region LB4, and the fifth region LB5 of the living body LB, counting from the leftmost region on the page, and the amount of light received by the light receiving element 210a corresponding to each of these regions does not change. 1, the third region LB3 and the sixth region LB6 of the living body LB, counting from the leftmost region on the page, each have one sweat gland, and sweat W gushes out from each sweat gland. In this case, the amount of light received by the light receiving element 210a corresponding to each of these regions is lower than when sweat W does not gush out from each sweat gland. As a result, it is estimated that the decrease in the amount of light received by the light receiving element 210a corresponding to LB1 will be greater than the decrease in the amount of light received by the light receiving elements 210a corresponding to LB3 and LB6.

[0024] (Problems with non-contact sweat measurement) As described above, it is possible to measure the amount of sweating at each part of the living body LB in a non-contact manner, but it is difficult to compare the sweating conditions at corresponding parts by simply comparing the amount of light received by the multiple light receiving elements 210a. The reason is that it is difficult to keep the relative positions of the multiple light receiving elements 210a and the living body LB in a direction along the surface of the living body LB exactly the same. In general, the density of sweat glands in a human is 130 to 600 per cm. 2 The average sweat line interval is calculated to be 0.4 to 0.8 mm. Therefore, even if the relative position is shifted by only about 1 mm, the correspondence between the multiple parts of the living body LB and the multiple light receiving elements 210a changes, so even if the amount of light received by each light receiving element 210a is obtained, the sweating state of the part corresponding one-to-one to the light receiving element 210a is not obtained.

[0025] Therefore, by taking statistics on the signals output from the light receiving system 200-1 for each part of the living body LB, the overall sweating condition (sweating tendency) of multiple parts of the living body LB can be determined, and the state of the living body LB (e.g., mental state) can be determined from the sweating condition.

[0026] Supplementally, the biosensor according to one embodiment utilizes the fact that sweat appears discretely at the sweat gland position during a slight sweat phenomenon such as mental sweating. In this case, measurement is performed using a plurality of light receiving elements arranged in an array, but the amount of sweat is measured using the statistics of the overall output of the plurality of light receiving elements, rather than observing the output value of each individual light receiving element. For example, when observing skin that is not sweating, creating a histogram of the output from each of the multiple light receiving elements results in an output distribution with an approximately normal distribution shape that follows the average skin reflectance distribution. In contrast, when sweating occurs, the reflectance of the light receiving elements that receive reflected light from areas with sweat glands decreases due to the moisture in the sweat. As a result, the center of gravity of the reflectance distribution shifts from the approximately normal distribution to the low output side. As sweating progresses, the output shifts even further to the low output side, and finally when the skin is filled with sweat, the output of all the light receiving elements becomes 0.

[0027] (Processing system) The processing system 300-1 determines the state of the living body LB based on statistics regarding the signals for each part of the living body LB output from the light receiving system 200-1. The state of the living body LB is, for example, a mental state estimated from the sweating state of each part of the living body LB.

[0028] The processing system 300-1, for example, determines the state of the living body using a first distribution D1 (see FIG. 3), which is a distribution of the number of signals (the number of signals) for each signal value of the signals for each part of the living body LB. In FIG. 3, the horizontal axis represents the signal value, and the vertical axis represents the number of signals. Here, as shown in FIG. 3, when it is assumed that the living body LB is not sweating, the distribution of the number of signals for each signal value of each signal of the multiple parts of the living body LB becomes an approximately normal distribution (hereinafter referred to as the "second distribution D2") corresponding to the reflectance distribution of the multiple parts themselves. In contrast, as described above, the first distribution D1 is a distribution of the number of signals for each signal value of the signal for each part of the living body LB when the living body LB is sweating, and therefore is a distribution in which the absorbance (absorbance) of the sweat W attached to the part is added to the reflectance of the part itself, that is, a distribution shifted toward a lower signal value side compared to the second distribution. In this case, the feature amount of the first distribution becomes an index indicating the sweating state of the living body LB. Therefore, the processing system 300-1 can determine the state of the living body LB (for example, the mental state estimated from the sweating state of the living body LB) from the feature amount of the first distribution.

[0029] 3, the second distribution D2 is an output distribution that is a nearly normal distribution with the signal value centered at about 30. On the other hand, the first distribution D1 has an average signal value that drops to about 20, and the center of gravity is shifted toward the lower signal value side with respect to the second distribution D2. By statistically processing all outputs without capturing the output of each light receiving element, it is possible to obtain the presence or absence of sweating and the amount of sweating without complex processing. By performing such statistical processing, when there is no sweating even if there are external factors such as the incidence of external light or the measurement position of the skin being shifted, a nearly normal distribution is obtained, and when the distribution shifts to the low output side, it is understood that sweating has occurred in an amount corresponding to the amount of shift. Therefore, by performing statistical processing using multiple light receiving elements, it is possible to continuously measure the amount of sweating regardless of external factors.

[0030] 2, the processing system 300-1 includes a distribution acquisition unit 300a, a feature amount extraction unit 300b, and a discrimination unit 300c. The processing system 300-1 is realized by hardware such as a CPU, a chipset, and the like. The distribution acquisition section 300a acquires a first distribution D1. The feature extraction unit 300b extracts the feature from the first distribution D1.

[0031] The feature amount of the first distribution D1 may be anything that indicates the deviation of the first distribution from the second distribution, such as the distortion (kurtosis, skewness), variance, standard deviation, etc. The greater the difference between the feature amount of the first distribution and the feature amount of the corresponding second distribution, the greater the amount of sweating of the living body LB, and it can be estimated that, for example, the living body LB is in a state of greater tension, greater stress, greater autonomic nerve disorder, etc.

[0032] For example, the feature amount of the first distribution D1 is, as shown in FIG. 4, an average value S1 Ave This average value S1 Ave is the average signal value S2 of the signal for each part of the living body LB in the second distribution D2 Ave The smaller the value, the greater the amount of sweating in the living body LB is estimated to be.

[0033] For example, the feature amount of the first distribution D1 is, for example, an average value S1 AVeThe number of signals may be less than or equal to the reference value. This number of signals is determined when the signal values ​​for each part of the living body LB in the second distribution D2 are less than or equal to the average value S2 Ave The above reference value is the average signal value S1 of the signal values ​​of the signals for each part of the living body LB in the first distribution D1. AVe is not limited to this, and may be any value less than the maximum value of the signal value.

[0034] For example, the feature amount of the first distribution D1 is the median value S1 of the signal value of the signal for each part of the living body LB, as shown in FIG. Me This median value S1 Me is the median value S2 of the signal value for each part of the living body LB in the second distribution D2 Me The smaller the value, the greater the amount of sweating in the living body LB is estimated to be.

[0035] For example, the feature amount of the first distribution D1 is the most frequent value S1 of the signal value of the signal for each part of the living body LB, as shown in FIG. Mo (the signal value at which the number of signals in the first distribution peaks). Mo is the mode S2 of the signal value for each part of the living body LB in the second distribution D2 Mo The smaller this value is, the greater the amount of sweating is estimated to be in the living body LB.

[0036] 4. <Biometric status determination process 1> Hereinafter, the biological condition determination process 1 performed by using the biological sensor 10-1 will be described with reference to the flowchart of Fig. 7. The biological condition determination process 1 is an example of a biological condition determination method according to the present technology. The biological condition determination process 1 is started, for example, when the power of the biological sensor 10-1, whose measuring unit is close to and facing the living body LB, is turned on.

[0037] In the first step S1, the illumination system 100-1 irradiates the living body LB with illumination light IL. Specifically, the illumination system 100-1 causes the light source 110a to emit light, and irradiates the living body LB with illumination light IL including light with wavelengths within the wavelength band WB and light with wavelengths outside the wavelength band WB.

[0038] In the next step S2, the light receiving system 200-1 detects the peak wavelength λ related to water absorption among the light reflected by each of the multiple parts of the living body LB. P Specifically, among the light (illumination light IL) irradiated to and reflected from each of the multiple parts of the living body LB, the light within the wavelength band WB passes through the wavelength selection filter 220b and is collected by the corresponding light receiving lens 220a1 on the corresponding light receiving element 210a.

[0039] In the next step S3, the light receiving system 200-1 outputs a signal for each part of the living body LB. Specifically, each of the multiple light receiving elements 210a photoelectrically converts the received light and outputs an electrical signal according to the amount of received light.

[0040] In the next step S4, the processing system 300-1 acquires a first distribution D1. Specifically, the distribution acquisition unit 300a acquires a distribution of the number of signals for each signal value of the signals for each part of the living body LB (see FIG. 3).

[0041] In the next step S5, the processing system 300-1 extracts a feature of the first distribution D1. Specifically, the feature extraction unit 300b extracts, for example, a mean value S1 Ave , the signal value is the average value S1 Ave Number of signals below, median S1 Me , mode S1 Mo Extract the following:

[0042] In the next step S6, the processing system 300-1 determines the state of the living body LB from the feature amount of the first distribution D1. For example, if the feature quantity of the first distribution D1 has a mean value S1 AveIn this case, the discrimination unit 300c determines that the smaller the value (the more the living body LB is sweating), the more tense the living body LB is, and determines that the larger the value (the less the living body LB is sweating), the more relaxed the living body LB is. For example, the feature of the first distribution D1 has a signal value with a mean value S1 Ave If the number of signals is below the above range, the discrimination unit 300c determines that the greater the number of signals (the greater the amount of sweating by the living organism LB), the more tense the living organism LB is, and determines that the smaller the number of signals (the less the amount of sweating by the living organism LB), the more relaxed the living organism LB is. For example, the feature of the first distribution has a median S1 Me In this case, the discrimination unit 300c determines that the smaller the value (the more the living body LB is sweating), the more tense the living body LB is, and determines that the larger the value (the less the living body LB is sweating), the more relaxed the living body LB is. For example, the feature of the first distribution is the mode S1 Mo In this case, the discrimination unit 300c determines that the smaller the value (the more the living body LB is sweating), the more tense the living body LB is, and determines that the larger the value (the less the living body LB is sweating), the more relaxed the living body LB is. The discrimination unit 300c may output the result of the discrimination (for example, the mental state of the living body LB according to the magnitude of the feature amount of the first distribution) in a graded manner. For example, the discrimination result may be output on a 10-level scale, with 1 being the most relaxed state of the living body LB and 10 being the most tense state.

[0043] In the final step S7, the processing system 300-1 judges whether or not to end the process. Specifically, the processing system 300-1 ends the process when, for example, the power supply of the biosensor 10-1 is turned off. If the judgment in step S7 is positive, the flow ends, and if it is negative, the flow returns to step S1.

[0044] 5. Effects of the biosensor and the biostatus determination method according to Example 1 of an embodiment of the present technology The biosensor 10-1 according to the first embodiment has a peak wavelength λ P The illumination system 100-1 irradiates the living body LB with illumination light IL including light with wavelengths within a wavelength band WB including the wavelengths of the illumination light IL and the wavelengths of the light reflected from the illumination system 100-1 at each of a plurality of parts of the living body LB, and a light receiving system 200-1 receives light having wavelengths within the wavelength band WB individually from the light irradiated from the illumination system 100-1 and reflected from each of a plurality of parts of the living body LB. The light receiving system 200-1 determines the state of the living body LB based on statistics regarding the signals for each part output from the light receiving system 200-1. This allows the state of the living body LB to be determined from statistics of signal values ​​corresponding to the actual reflectance (reflectance that accurately reflects the presence or absence and amount of sweat W) at each of the multiple parts of the living body LB, making it possible to easily determine the state of the living body LB. As a result, the biosensor 10-1 can provide a biosensor that can easily determine the state of the living organism LB. In addition, since light with wavelengths outside the wavelength band WB is relatively poorly absorbed by water, even if the light reflected by the living body LB and outside the wavelength band WB is received by the photodetector array, the light reception result does not accurately reflect the presence or amount of sweat W.

[0045] On the other hand, in the method of obtaining the output from each light receiving element as described above, even a slight deviation in the relative position between the biosensor and the living body changes the correspondence between the multiple light receiving elements and the multiple parts of the living body. As a countermeasure to this, a method of tracking the output of the light receiving element array as an image, tracking the signals of each sweat gland, and obtaining continuous values ​​can be considered. However, even if such a method is used, a large amount of calculation is required, making it impossible to realize a biosensor that can easily determine the state of the living body.

[0046] Another method is to define the amount of sweat as the average value of all the measured values ​​of the light receiving element array. In this case, the output of each light receiving element is not important, and it can be considered that the amount of sweat has increased simply if the overall reflectance has decreased. In this configuration, the light receiving elements do not necessarily need to be arranged in an array, and a single light receiving element will suffice. However, in such a case, if the entire sensor floats off the skin when the living body moves, allowing external light to enter, or if the entire sensor moves laterally and the average reflectance of the skin changes, continuous measurement is not possible.

[0047] When wanting to know a person's mental state, it is not enough to assume that the person is resting in a hospital or laboratory; it is also necessary to attach the device to the person as a wearable device and measure sweating in everyday life environments. Therefore, sufficient measures are needed to prevent the intrusion of external light, and further improvements are required. The biosensor according to the present technology can stably measure perspiration without tracking and with the same ease as using the average value of all the measured values ​​described above.

[0048] The processing system 300-1 determines the state of the living body LB by using a first distribution, which is a distribution of the number of signals for each signal value of the signals for each part of the living body LB. This makes it possible to more easily determine the state of the living body LB.

[0049] It is preferable that the processing system 300-1 determines the state of the living body LB from the feature amount of the first distribution D1, thereby making it possible to determine the state of the living body LB more simply and accurately.

[0050] The feature amount of the first distribution D1 is the average signal value S1 of the signal for each part of the living body LB. Ave , median S Me Or the mode S Mo This makes it possible to calculate the index of the amount of sweating by a process that is much simpler than calculating the skewness, for example.

[0051] The feature amount of the first distribution D1 may be the number of signals whose signal values ​​for each part of the living body LB are equal to or less than a reference value. This allows the index of the amount of sweating to be calculated by a process much simpler than calculating the skewness, for example. In this case, the reference value is, for example, the average value S1 Ave The reference value may be the average value S1 Ave In this case, a valid discrimination result can be obtained very easily.

[0052] The light receiving system 200-1 includes a light receiving element array 210 including a plurality of light receiving elements 210a respectively corresponding to a plurality of parts of the living body LB, and an optical system 220-1 corresponding to the plurality of light receiving elements 210a, and the optical system 220-1 guides light having a wavelength within the wavelength band WB among the light irradiated from the irradiation system 100-1 and reflected by each of the plurality of parts of the living body LB to the light receiving element 210a corresponding to the part. This makes it possible to reliably guide the light having a wavelength within the wavelength band WB among the light reflected by each part of the living body LB to the light receiving element 210a corresponding to the part.

[0053] The illumination light IL includes light having wavelengths within the wavelength band WB and light having wavelengths outside the wavelength band WB, and the optical system 220-1 has a wavelength selection filter 220b that selectively passes light having wavelengths within the wavelength band WB among the light irradiated from the illumination system 100-1 and reflected by each of the multiple parts. This makes it possible to block light having wavelengths outside the wavelength band WB that are relatively less absorbed by water among the light reflected by each part of the living body LB.

[0054] The optical system 220-1 has a light receiving lens 220a1 that guides light of wavelengths within the wavelength band WB that has passed through the wavelength selection filter 220b to the corresponding light receiving element 210a. This ensures that light of wavelengths within the wavelength band WB that has passed through the wavelength selection filter 220b among the light reflected at each part of the living body LB is guided to the corresponding light receiving element 210a.

[0055] The state of the living body LB is, for example, a mental state estimated from the sweating state of each part of the living body LB. This makes it possible to provide the biosensor 10-1 that can easily determine the mental state of the living body LB.

[0056] A biological condition determination method (for example, biological condition determination process 1) using the biological sensor 10-1 of Example 1 of an embodiment of the present technology is a method for determining a biological condition using a peak wavelength λ P the step of irradiating the living body LB with irradiation light IL including light of wavelengths within a wavelength band WB including the wavelengths of the light reflected from the irradiation system 100-1 at each of a plurality of parts of the living body LB, individually receiving light of wavelengths within the wavelength band WB from the light irradiated from the irradiation system 100-1 and reflected at each of the plurality of parts of the living body LB and outputting a signal for each of the parts; and the step of determining the state of the living body LB based on statistics regarding the signals for each of the parts output in the outputting step. This allows the state of the living body LB to be determined from statistics of signal values ​​corresponding to the actual reflectance (reflectance that also reflects the influence of sweat W) at each of the multiple locations, making it possible to easily determine the state of the living body LB. As a result, according to the biological condition determining method using the biological sensor 10-1, the condition of the living body LB can be easily determined.

[0057] 6. <Configuration of a biosensor according to a modified example of Example 1 of an embodiment of the present technology> As shown in FIG. 8, the biosensor according to the modified example of the first embodiment has the same configuration as the biosensor 10-1 according to the first embodiment (see FIG. 1), except that the configuration of the processing system is different. A processing system 300-2 of a biosensor according to the modified example includes a storage unit 300d and a comparison unit 300e in addition to the configuration of the processing system 300-1 (see FIG. 2).

[0058] The storage unit 300d stores a second distribution D2 that has been acquired in advance. The second distribution D2 is acquired in advance by performing a measurement using a biosensor according to a modified example on a living body LB that is in a resting and relaxed state (a state in which there is no sweating), for example. The storage unit 300d is realized by, for example, a ROM, a RAM, a flash memory, a hard disk, or the like.

[0059] In the processing system 300-2, the feature extraction unit 300b extracts features of the first distribution D1 acquired by the distribution acquisition unit 300a, and also extracts features of the second distribution D2 stored in the memory unit 300d (features corresponding to (the same type of) features as the features of the first distribution D1).

[0060] The comparison unit 300e compares the features of the first and second distributions D1 and D2 extracted by the feature extraction unit 300b. The comparison unit 300e is implemented by, for example, a CPU.

[0061] In the processing system 300-2, the discrimination section 300c discriminates the state of the living body LB according to the comparison result in the comparison section 300e. 7. <Biometric status determination process 2> Hereinafter, a biological condition determination process 2 performed by using a biological sensor according to a modification of the first embodiment will be described with reference to the flowchart of Fig. 9. The biological condition determination process 2 is an example of a biological condition determination method according to the present technology. The biological condition determination process 1 is started, for example, when the power supply of the biological sensor in a state where a measuring unit is close to and facing a living body LB is turned on.

[0062] In a first step S11, the illumination system 100-1 irradiates the living body LB with illumination light IL. Specifically, the illumination system 100-1 causes the light source 110a to emit light, and irradiates the living body LB with illumination light IL including light with wavelengths within the wavelength band WB and light with wavelengths outside the wavelength band WB.

[0063] In the next step S12, the light receiving system 200-1 detects the peak wavelength λ related to water absorption among the light reflected by each of the multiple parts of the living body LB. P Specifically, among the light (illumination light IL) irradiated to and reflected from each of the multiple parts of the living body LB, the light within the wavelength band WB passes through the wavelength selection filter 220b and is collected by the corresponding light receiving lens 220a1 on the corresponding light receiving element 210a.

[0064] In the next step S13, the light receiving system 200-1 outputs a signal for each part of the living body LB. Specifically, each of the multiple light receiving elements 210a photoelectrically converts the received light and outputs an electrical signal according to the amount of received light to the processing system 300-2.

[0065] In the next step S14, the processing system 300-2 acquires a first distribution D1. Specifically, the distribution acquisition unit 300a acquires a distribution of the number of signals for each signal value of the signals for each part of the living body LB from the input signals for each part of the living body LB (see FIG. 3), and outputs the acquisition result to the feature extraction unit 300b.

[0066] In the next step S15, the processing system 300-2 extracts features of the first and second distributions D1 and D2. Specifically, the feature extraction unit 300b extracts the features of the input first distribution D1 and the features of the second distribution D2 stored in the storage unit 300d, and outputs the features of the first and second distributions D1 and D2 to the comparison unit 300e. For example, the feature extraction unit 300b extracts the average value S1 from the first distribution D1. Ave Extract the mean value S2 from the second distribution D2. Ave (See Figure 4). For example, the feature extraction unit 300b extracts a signal value from the first distribution D1 according to a reference value (for example, the average value S1 Ave ) or less, and from the second distribution D2, the number of signals whose signal values ​​are less than a reference value (for example, the average value S2 Ave ) Extract the following number of signals. For example, the feature extraction unit 300b extracts a median S1 from the first distribution D1. Me Extract the median S2 from the second distribution D2. Me (See Figure 5). For example, the feature extraction unit 300b extracts the most frequent value S1 from the first distribution D1. Mo Extract the most frequent value S2 from the second distribution D2. Mo (See Figure 6). For example, the feature extraction unit 300b extracts from the first distribution D1 the ratio (e.g., 0.5) of the number of signals (e.g., 400 and 200 in FIG. 3) whose signal values ​​match each of the multiple values ​​(e.g., 15 and 45 in FIG. 3), and extracts from the second distribution D2 the ratio (e.g., 0.78) of the number of signals (e.g., 250 and 320 in FIG. 3) whose signal values ​​match each of the multiple values ​​(e.g., 15 and 45 in FIG. 3).

[0067] In the next step S16, the processing system 300-2 compares the feature quantities of the first and second distributions D1 and D2. Specifically, the comparison unit 300e compares the corresponding feature quantities of the input first and second distributions D1 and D2, and outputs the comparison result (e.g., the difference or ratio between the feature quantities) to the discrimination unit 300c. For example, the comparison unit 300e detects the input average value S1 Ave and the average value S2 Ave The difference between these is calculated and output to the discrimination unit 300c. For example, when the comparison unit 300e detects that the input signal value is an average value S1 Ave The number of signals and the signal value are average S2 Ave The difference with the following signal number is calculated and the difference is output to the discrimination unit 300c. For example, the comparison unit 300e compares the input median value S1 Me and median S2 Me The difference between these is calculated and output to the discrimination unit 300c. For example, the comparison unit 300e compares the input most frequent value S1 Mo and the mode S2 Mo The difference between these is calculated and output to the discrimination unit 300c. The discrimination unit 300c may output the result of the discrimination (for example, the mental state of the living body LB according to the magnitude of the difference) in a graded manner. For example, the discrimination result may be output on a 10-level scale, with 1 being the most relaxed state of the living body LB and 10 being the most tense state.

[0068] In the next step S17, the processing system 300-2 determines the state of the living body LB. Specifically, the determination unit 300c determines the state of the living body LB according to the input comparison result (for example, the difference or ratio of the feature amounts). For example, the discrimination unit 300c discriminates that the living body LB is in a more tense state as the difference between the input feature amounts increases, and that the living body LB is in a more relaxed state as the difference between the input feature amounts decreases.

[0069] In the final step S18, the processing system 300-2 judges whether or not to end the process. Specifically, the processing system 300-2 ends the process when the power supply of the biosensor according to the modification of the first embodiment is turned off, for example. If the judgment in step S18 is positive, the flow ends, and if it is negative, the flow returns to step S11.

[0070] In the biosensor according to the modified example of Example 1, the second distribution D2 is stored in advance in the memory unit 300d. Alternatively or in addition to this, the second distribution D2 may be acquired and updated at any time using the biosensor. In the biosensor according to the modified example of the first embodiment, the discrimination unit 300c may also have the function of the comparison unit 300e, in which case the comparison unit 300e is not necessary.

[0071] 8. Effects of the biosensor according to the modified example of Example 1 of the embodiment of the present technology In the biosensor according to the modification of the first embodiment, the processing system 300-2 compares the feature amounts of the first and second distributions D1D and D2 to determine the state of the living body LB (for example, the mental state according to the sweating state of the living body LB). This makes it possible to more accurately determine the state of the living body LB. The feature amount of the second distribution D2 is a feature amount that corresponds to (is of the same type as) the feature amount of the first distribution D1. For example, the feature of the first distribution D1 may be the ratio of the number of signals whose signal values ​​match multiple values ​​among the signals for each part in the first distribution D1, and the feature of the second distribution D2 may be the ratio of the number of signals whose signal values ​​match multiple values ​​among the signals for each part in the second distribution D2.

[0072] 9. <Biosensors according to Examples 2 to 20 of an embodiment of the present technology> Hereinafter, biosensors 10-2 to 10-20 according to examples 2 to 20 of one embodiment will be described with reference to FIGS.

[0073] (Biosensor according to Example 2) As shown in FIG. 10, the biosensor 10-2 of the second embodiment has a similar configuration to that of the biosensor 10-1 of the first embodiment, except that the positional relationship between the lens array 220a and the wavelength selection filter 220b in the light receiving optical system is reversed from that of the biosensor 10-1 of the first embodiment. In the biosensor 10-2, a wavelength selection filter 220b of the optical system 220-2 is disposed between the lens array 220a of the optical system 220-2 and the light receiving element array 210 of the light receiving system 200-2. That is, in the optical system 220-2, the lens array 220a is disposed on the living body LB side, and the lens array 220a and the wavelength selection filter 220b are disposed adjacent to each other so that the wavelength selection filter 220b is disposed on the light receiving element array 210 side. As described above, in the biosensor 10-2 according to the second embodiment, the optical system 220-2 has the light receiving lens 220a1 that guides light having a wavelength within the wavelength band WB to the corresponding light receiving element 210a via the wavelength selection filter 220b. The biosensor 10-2 according to the second embodiment described above can also achieve the same effects as those of the biosensor 10-1 according to the first embodiment.

[0074] (Biosensor according to Example 3) As shown in FIG. 11, the biosensor 10-4 according to the third embodiment has the same configuration as the biosensor 10-1 according to the first embodiment, except that the irradiation system has a wavelength selection filter instead of the light receiving system. The illumination system 100-4 of the biosensor 10-4 has a wavelength selection filter 120 disposed on the optical path between the light source 110a and the living body LB. The wavelength selection filter 120 is substantially the same as the wavelength selection filter 220b of the biosensor 10-1 according to the first embodiment.

[0075] That is, the illumination system 100-4 has a light source 110a that emits light of a wavelength within a wavelength band WB and light of a wavelength outside the wavelength band WB, and a wavelength selection filter 120 that selectively passes light within the wavelength band WB among the light within the wavelength band WB and the light outside the wavelength band WB emitted from the light source 110a. The optical system 220-4 of the light receiving system 200-4 of the biosensor 10-4 has a lens array 220a including a plurality of light receiving lenses 220a1 that guides light of a wavelength within the wavelength band WB that passes through the wavelength selection filter 120 and is reflected by a corresponding part of the living body LB to a corresponding light receiving element 210a. In the biosensor 10-4 configured as above, the light having a wavelength within the wavelength band WB emitted from the light source 110a and the light having a wavelength within the wavelength band WB among the light having a wavelength outside the wavelength band WB pass through the wavelength selection filter 120 and are irradiated as irradiation light to the living body LB. The light having a wavelength within the wavelength band WB irradiated to the living body LB and reflected from each of the multiple parts of the living body LB passes through the wavelength selection filter 120 again and is guided to the corresponding light receiving element 210a via the corresponding light receiving lens 220a1. The biosensor 10-4 according to the third embodiment described above also has the same effects as the biosensor 10-1 according to the first embodiment.

[0076] (Biosensor according to Example 4) As shown in FIG. 12, the biosensor 10-5 of the fourth embodiment has a similar configuration to the biosensor 10-1 of the first embodiment, except that the illumination system 100-5 has a light source 110b that emits only light within the wavelength band WB, and the light receiving system 200-4 does not have a wavelength selection filter.

[0077] That is, in the biosensor 10-5, the irradiated light includes only light of wavelengths within the wavelength band WB, and the optical system 220-4 of the light receiving system 200-4 has a lens array 220a including a light receiving lens 220a1 that guides the light of wavelengths within the wavelength band WB irradiated from the irradiation system 100-5 and reflected by each of multiple parts of the living body LB to the light receiving element 210a corresponding to those parts.

[0078] In the biosensor 10-5 configured as above, light having a wavelength within the wavelength band WB emitted from the light source 110b is irradiated onto the living body LB as irradiation light. The light having a wavelength within the wavelength band WB irradiated onto the living body LB and reflected from each of a plurality of parts of the living body LB is guided to the corresponding light receiving element 210a via the light receiving lens 220a1 corresponding to the part. The biosensor 10-5 according to the fourth embodiment described above has the same effects as the biosensor 10-1 according to the first embodiment, and can be made smaller in size because it does not have a wavelength selection filter.

[0079] (Biosensor according to Example 5) As shown in FIG. 13, the biosensor 10-6 of Example 5 has a configuration similar to that of the biosensor 10-1 of Example 1, except that the optical system 220-6 of the light receiving system 200-6 has a light-shielding member 220d (optical member) instead of a lens array. The light blocking member 220d is disposed between the wavelength selection filter 220b and the light receiving element array 210. The light blocking member 220d has light blocking walls 220d1 that form light guide paths LGP (Light Guide Paths) corresponding to each of the light receiving elements 210a. The light blocking walls 220d1 are provided so as to surround each light guide path LGP. The light blocking walls 220d1 separate adjacent light guide paths LGP.

[0080] In the biosensor 10-6 configured as described above, the light having a wavelength within the wavelength band WB among the light irradiated to the living body LB and reflected at each of the multiple parts of the living body LB passes through the wavelength selection filter 220b and is incident on the corresponding light receiving element 210a via the corresponding light guide path LGP. According to the biosensor 10-6 described above, substantially the same effects as those of the biosensor 10-1 of the first embodiment can be obtained.

[0081] (Biosensor according to Example 6) As shown in FIG. 14, the biosensor 10-7 of the sixth embodiment has the same configuration as the biosensor 10-6 of the fifth embodiment, except that the positional relationship between the wavelength selection filter 220b and the light blocking member 220d in the light receiving optical system is different. In the biosensor 10-7, in the optical system 220-7 of the light receiving system 200-7, the light blocking member 220d is disposed on the living body LB side, and the wavelength selection filter 220b is disposed on the lens array 220a side. In the biosensor 10-7 configured as described above, the light irradiated from the irradiation system 100-1 and reflected from each of the multiple parts of the living body LB is guided through the corresponding light guide path LGP of the light blocking member 220d, and light having a wavelength within the wavelength band WB of the guided light passes through the wavelength selection filter 220b and is incident on the corresponding light receiving element 210a. According to the biosensor 10-7 described above, the same effects as those of the biosensor 10-6 of the fifth embodiment can be obtained.

[0082] (Biosensor according to Example 7) As shown in FIG. 15, the biosensor 10-9 according to the seventh embodiment has the same configuration as the biosensor 10-1 according to the first embodiment, except that the irradiation system has a wavelength selection filter instead of the light receiving system. The illumination system 100-4 of the biosensor 10-9 has a wavelength selection filter 120 disposed on the optical path between the light source 110a and the living body LB. The wavelength selection filter 120 is substantially the same as the wavelength selection filter 220b of the biosensor 10-1 according to the first embodiment.

[0083] That is, the illumination system 100-4 has a light source 110a that emits light of a wavelength within a wavelength band WB and light of a wavelength outside the wavelength band WB, and a wavelength selection filter 120 that selectively passes light within the wavelength band WB among the light within the wavelength band WB and the light outside the wavelength band WB emitted from the light source 110a. The optical system 220-9 of the light receiving system 200-9 of the biosensor 10-9 has a light blocking member 220d that guides light having wavelengths within the wavelength band WB that passes through the wavelength selection filter 120 and is reflected by each of the multiple parts of the living body LB to the light receiving element 210a corresponding to that part. In the biosensor 10-9 configured as above, the light of wavelengths within the wavelength band WB emitted from the light source 110a and the light of wavelengths outside the wavelength band WB that are within the wavelength band WB pass through the wavelength selection filter 120 and are irradiated as irradiation light to the living body LB. The light of wavelengths within the wavelength band WB that is irradiated to the living body LB and reflected from each of the multiple parts of the living body LB passes through the wavelength selection filter 120 again and is guided to the corresponding light receiving element 210a via the corresponding light guide path LGP of the light blocking member 220d. The biosensor 10-9 according to the seventh embodiment described above also has the same effects as the biosensor 10-6 according to the fifth embodiment.

[0084] (Biosensor according to Example 8) As shown in FIG. 16, the biosensor 10-10 of the eighth embodiment has a similar configuration to the biosensor 10-6 of the fifth embodiment, except that the illumination system 100-5 has a light source 110b that emits only light within the wavelength band WB, and the light receiving system 200-10 does not have a wavelength selection filter.

[0085] That is, in the biosensor 10-10, the irradiated light includes only light with wavelengths within the wavelength band WB, and the optical system 220-10 of the light receiving system 200-10 has a light-shielding member 220d that guides the light with wavelengths within the wavelength band WB irradiated from the irradiation system 100-5 and reflected from each of the multiple parts of the living body LB to the light receiving element 210a corresponding to those parts.

[0086] In the biosensor 10-10 configured as above, light having a wavelength within the wavelength band WB emitted from the light source 110b is irradiated onto the living body LB as irradiation light. The light having a wavelength within the wavelength band WB irradiated onto the living body LB and reflected from each of the multiple parts of the living body LB is guided to the corresponding light receiving element 210a via the corresponding light guide path LGP of the light blocking member 220d. The biosensor 10-10 according to the eighth embodiment described above has the same effects as the biosensor 10-6 according to the fifth embodiment, and can be made smaller in size because it does not have a wavelength selection filter.

[0087] (Biosensor according to Example 9) As shown in FIG. 17, the biosensor 10-11 of Example 9 has a similar configuration to the biosensor 10-1 of Example 1, except that the illumination system 100-11 has a light source array including a plurality of light sources 110a, and the light source array and the light receiving element array 210-11 including a plurality of light receiving elements 210a are integrally arranged along the same plane. The illumination system 100-11 of the biosensor 10-11 includes at least one (e.g., multiple) light source 110a that is arranged between two adjacent light receiving elements 210a among a plurality of light receiving elements 210a arranged in an array, and emits light of wavelengths within the wavelength band WB and light of wavelengths outside the wavelength band WB. Conversely, the light receiving system 200-11 of the biosensor 10-11 includes at least one (eg, a plurality of) light receiving elements 210a arranged between two adjacent light sources 110a among the plurality of light sources 110a arranged in an array. 17, the light sources 110a of the light source array and the light receiving elements 210a of the light receiving element array 210-11 are generally arranged in an array along the same plane. Here, as an example, three light receiving elements 210a are arranged between two adjacent light sources 110a. Each light source 110a is disposed at a position corresponding to the boundary between two adjacent light receiving lenses 220a1 of lens array 220a of optical system 220-1 in the in-plane direction of the light source array.

[0088] In the generation sensor 10-11, light with wavelengths within the wavelength band WB and light with wavelengths outside the wavelength band WB emitted from each light source 110a enters two adjacent light receiving lenses 220a1 across the two light receiving lenses 220a1 and is diffused by the two light receiving lenses 220a1. Of the diffused light, light with wavelengths within the wavelength band WB passes through the wavelength selection filter 220b and is irradiated across two adjacent parts of the living body LB. The light with wavelengths within the wavelength band WB reflected by each of the two adjacent parts of the living body LB passes through the wavelength selection filter 220b again and is collected by the corresponding light receiving lens 220a1 on the corresponding light receiving element 210a.

[0089] The biosensor 10-11 has the same effects as the biosensor 10-1 according to the first embodiment, and can be made smaller since the light sources 110a and the light receiving elements 210a are integrally arranged in an array.

[0090] (Biosensor according to Example 10) As shown in FIG. 18, the biosensor 10-12 according to the tenth embodiment has the same configuration as the biosensor 10-11 according to the ninth embodiment, except that the positional relationship between the lens array and the wavelength selection filter in the light receiving optical system is different. In the biosensor 10-12, a wavelength selection filter 220b of the optical system 220-2 is disposed between the lens array 220a of the optical system 220-2 of the light receiving system 200-12 and the light receiving element array 210-11. That is, in the optical system 220-2, the lens array 220a is disposed on the living body LB side, and the lens array 220a and the wavelength selection filter 220b are disposed adjacent to each other so that the wavelength selection filter 220b is disposed on the light receiving element array 210 side. As described above, in the biosensor 10-12 according to the tenth embodiment, the optical system 220-2 has the light receiving lens 220a1 that guides light having a wavelength within the wavelength band WB to the corresponding light receiving element 210a via the wavelength selection filter 220b. The biosensor 10-12 according to the tenth embodiment described above can obtain the same effects as the biosensor 10-11 according to the ninth embodiment.

[0091] (Biosensor according to Example 11) As shown in FIG. 19, the biosensor 10-13 of Example 11 has a configuration similar to that of the biosensor 10-11 of Example 9, except that the illumination system 100-13 has a light source 110b that emits only light within the wavelength band WB, and the light receiving system 200-13 does not have a wavelength selection filter.

[0092] That is, in the biosensor 10-13, the irradiated light includes only light with wavelengths within the wavelength band WB, and the optical system 220-3 of the light receiving system 200-13 has a lens array 220a including a plurality of light receiving lenses 220a1 that guides the light with wavelengths within the wavelength band WB irradiated from the irradiation system 100-13 and reflected by each of the multiple parts of the living body LB to the light receiving element 210a corresponding to those parts.

[0093] In the biosensor 10-13 configured as above, light of wavelengths within the wavelength band WB emitted from each light source 110b is irradiated as irradiation light across two adjacent parts of the living body LB. The light of wavelengths within the wavelength band WB irradiated to the two adjacent parts of the living body LB and reflected from each of the two parts is collected on the corresponding light receiving element 210a by the light receiving lens 220a1 corresponding to the part. The biosensor 10-13 according to the eleventh embodiment described above has the same effects as the biosensor 10-11 according to the ninth embodiment, and can be made smaller in size since it does not have a wavelength selection filter.

[0094] (Biosensor according to Example 12) As shown in FIG. 20, the biosensor 10-14 of the embodiment 12 has a similar configuration to the biosensor 10-1 of the embodiment 1, except that it includes a light guide plate 400 disposed between the optical system 220-1 and the living body LB.

[0095] In the biosensor 10-14, the illumination system 100-1 includes a light source 100a that emits light with wavelengths within the wavelength band WB and light with wavelengths outside the wavelength band WB. The light source 110a is disposed on one end surface side with the emission direction facing the one end surface of the light guide plate 400. In detail, the emission direction of the light source 110a is set so that the light emitted from the light source 110a and incident into the light guide plate 400 from the one end surface of the light guide plate 400 is totally reflected by the surface of the light guide plate 400 on the living body LB side.

[0096] The light guide plate 400 guides light having wavelengths within the wavelength band WB and light having wavelengths outside the wavelength band WB among the light emitted from the light source 100a, and causes the light having wavelengths within the wavelength band WB and the light outside the wavelength band WB to be incident on each of multiple parts of the living body LB.

[0097] More specifically, the light guide plate 400 has a plurality of diffractive sections 400a on the optical system 220-1 side, which correspond to the plurality of light receiving elements 210a, respectively. The light guide plate 400 is transparent to at least light having a wavelength within the wavelength band WB. Each of the diffractive sections 400a reflects and diffracts the incident light toward a corresponding part of the living body LB.

[0098] In the biosensor 10-14 configured as above, most of the light emitted from the light source 110a is incident on one end surface of the light guide plate 400 into the light guide plate 400 and is totally reflected at different total reflection angles on the surface of the light guide plate 400 on the living body LB side. Each light totally reflected at different total reflection angles is reflected and diffracted by the corresponding diffraction section 400a, passes through the surface of the light guide plate 400 on the living body LB side, and is incident on the corresponding part of the living body LB. The light incident on the part is reflected at the part and passes through the corresponding diffraction section 400a of the light guide plate 400. Of the transmitted light, only light having a wavelength within the wavelength band WB passes through the wavelength selection filter 220b and is collected on the corresponding light receiving element 210a by the corresponding light receiving lens 220a1.

[0099] The biosensor 10-14 of the above-described Example 12 also has the same effect as the biosensor 10-1 of the above-described first Example 1, and can use the light guide plate 400 to more accurately guide reflected light from each part of the living body LB to the corresponding light receiving element 210a.

[0100] The light guide plate 400 may be transparent only to light having wavelengths within the wavelength band WB among the light emitted from the light source 110a. In this case, the wavelength selection filter 220b is not necessary because light having wavelengths outside the wavelength band WB can be blocked.

[0101] (Biosensor according to Example 13) As shown in FIG. 21, the biosensor 10-15 of the thirteenth embodiment has the same configuration as the biosensor 10-14 of the twelfth embodiment, except that the positional relationship between the lens array 220a and the wavelength selection filter 220b in the light receiving optical system is different. In the biosensor 10-15, a wavelength selection filter 220b of the optical system 220-2 is disposed between the lens array 220a of the optical system 220-2 and the light receiving element array 210 of the light receiving system 200-2. That is, in the optical system 220-2, the lens array 220a is disposed on the living body LB side, and the lens array 220a and the wavelength selection filter 220b are disposed adjacent to each other so that the wavelength selection filter 220b is disposed on the light receiving element array 210 side. As described above, in the biosensor 10-15 according to the thirteenth embodiment, the optical system 220-2 has the light receiving lens 220a1 that guides light having a wavelength within the wavelength band WB to the corresponding light receiving element 210a via the wavelength selection filter 220b. The biosensor 10-15 according to the thirteenth embodiment described above has the same effects as the biosensor 10-14 according to the twelfth embodiment.

[0102] (Biosensor according to Example 14) As shown in FIG. 22, the biosensor 10-16 according to the fourteenth embodiment has the same configuration as the biosensor 10-14 according to the twelfth embodiment, except that the irradiation system has a wavelength selection filter instead of the light receiving system. The illumination system 100-4 of the biosensor 10-16 has a wavelength selection filter 120 disposed on the optical path between the light source 110a and the living body LB. The wavelength selection filter 120 is substantially the same as the wavelength selection filter 220b of the biosensor 10-1 according to the first embodiment.

[0103] The light source 110a emits light having a wavelength within the wavelength band WB and light having a wavelength outside the wavelength band WB. The wavelength selection filter 120 selectively passes light within the wavelength band WB emitted from the light source 110a and light outside the wavelength band WB that is within the wavelength band WB.

[0104] The optical system 220-4 of the light receiving system 200-4 of the biosensor 10-16 has a light receiving lens 220a1 that guides light having wavelengths within the wavelength band WB that passes through the wavelength selection filter 120 and is reflected by each of the multiple parts of the living body LB to the light receiving element 210a corresponding to that part. In the biosensor 10-16 configured as above, each light emitted from the light source 110a and totally reflected by the surface of the light guide plate 400 on the living body LB side is diffracted by the corresponding diffraction section 400a, passes through the surface of the light guide plate 400 on the living body LB side, and is incident on the wavelength selection filter 120. Each light having a wavelength within the wavelength band WB that has passed through the wavelength selection filter 120 is reflected by a corresponding part of the living body LB, and is incident on the corresponding light receiving lens 220a1 via the wavelength selection filter 120 and the corresponding diffraction section 400a, and is collected on the corresponding light receiving element 210a by the light receiving lens 220a1. The biosensor 10-16 according to the fourteenth embodiment described above also has the same effects as the biosensor 10-14 according to the twelfth embodiment.

[0105] (Biosensor according to Example 15) As shown in FIG. 23, the biosensor 10-17 in accordance with the fifteenth embodiment has the same configuration as the biosensor 10-14 in accordance with the twelfth embodiment, except that a circular polarizer 220c is disposed between the light receiving element array 210 and the living body LB. According to the biosensor 10-17, the circular polarizer 220c can suppress the surface reflection of sweat and the surface (skin) of the living body LB, thereby reducing unnecessary noise and enabling stable measurement. Here, in the biosensor 10-17, as an example, the optical system 220-3 of the light receiving system 200-3 has a circular polarizer 220c disposed between the light guide plate 400 and the living body LB.

[0106] (Biosensor according to Example 16) As shown in FIG. 24, the biosensor 10-18 of the embodiment 16 has a similar configuration to the biosensor 10-14 of the embodiment 12, except that the illumination system 100-5 has a light source 110b that emits only light within the wavelength band WB, and the light receiving system 200-4 does not have a wavelength selection filter.

[0107] That is, in the biosensor 10-18, the irradiated light includes only light having wavelengths within the wavelength band WB, and the optical system 220-4 of the light receiving system 200-4 has a lens array 220a including a light receiving lens 220a1 that is irradiated from the irradiation system 100-5 via the light guide plate 400, reflected at each of multiple parts of the living body LB, and guides the light having wavelengths within the wavelength band WB via the light guide plate 400 to the light receiving element 210a corresponding to those parts.

[0108] In the biosensor 10-18 configured as above, most of the light having wavelengths within the wavelength band WB emitted from each light source 110b enters the light guide plate 400 from one end surface of the light guide plate 400 and is totally reflected at different total reflection angles by the surface of the light guide plate 400 on the living body LB side. Each light totally reflected at different total reflection angles is reflected and diffracted by the corresponding diffraction section 400a, passes through the surface of the light guide plate 400 on the living body LB side, and is incident on the corresponding part of the living body LB. The light incident on the part is reflected at the part, enters the light guide plate 400 again, and passes through the corresponding diffraction section 400a of the light guide plate 400. The transmitted light is focused on the corresponding light receiving element 210a by the corresponding light receiving lens 220a1. The biosensor 10-18 according to the sixteenth embodiment described above has the same effects as the biosensor 10-14 according to the twelfth embodiment, and can be made smaller in size since it does not have a wavelength selection filter.

[0109] (Biosensor according to Example 17) As shown in FIG. 25, the biosensor 10-19 in accordance with the seventeenth embodiment has a similar configuration to the biosensor 10-1 in accordance with the first embodiment, except that the light receiving system has lenses instead of a lens array. In the biosensor 10-19, an optical system 220-19 of a light receiving system 200-19 has a lens 220f (optical member) corresponding to a light receiving element array 210 including a plurality of light receiving elements 210a. The lens 220f is, for example, a lens that is convex toward the light receiving element array 210 side. In the biosensor 10-19, only light having a wavelength within the wavelength band WB among the light emitted from the light source 110a and reflected by each of the multiple parts of the living body LB passes through the wavelength selection filter 220b and enters the lens 220f. The light having a wavelength within the wavelength band WB that enters the lens 220f is focused by the lens 220f on the corresponding light receiving element 210a. The biosensor 10-19 described above has the same effect as the optical sensor 10-1 of Example 1, and since the optical system 220-19 has a single lens 220f, the positioning of the optical system 220-19 and the light receiving element array 210 is easy, the design is established like that of a camera, and the lens 220f is available at low cost.

[0110] (Biosensor according to Example 18) As shown in FIG. 26, the biosensor 10-20 according to the eighteenth embodiment has the same configuration as the biosensor 10-19 according to the seventeenth embodiment, except that the positional relationship between the lens array and the wavelength selection filter in the light receiving optical system is different. In the biosensor 10-20, a wavelength selection filter 220b of the optical system 220-20 is disposed between the lens 220f of the optical system 220-20 and the light receiving element array 210 of the light receiving system 200-2. That is, in the optical system 220-20, the lens 220f and the wavelength selection filter 220b are disposed adjacent to each other so that the lens 220f is disposed on the living body LB side, and the wavelength selection filter 220b is disposed on the light receiving element array 210 side. As described above, in the biosensor 10-20 according to the eighteenth embodiment, the optical system 220-20 has the lens 220f that guides the light having a wavelength within the wavelength band WB to the corresponding light receiving element 210a through the wavelength selection filter 220b. In this case, the same effect as that of the biosensor 10-19 according to the seventeenth embodiment can be obtained.

[0111] (Biosensor according to Example 19) As shown in FIG. 27, the biosensor 10-22 according to the nineteenth embodiment has the same configuration as the biosensor 10-19 according to the seventeenth embodiment, except that the irradiation system has a wavelength selection filter instead of the light receiving system. The illumination system 100-4 of the biosensor 10-22 has a wavelength selection filter 120 disposed on the optical path between the light source 110a and the living body LB. The wavelength selection filter 120 is substantially the same as the wavelength selection filter 220b of the biosensor 10-1 according to the first embodiment.

[0112] The light source 110a emits light having a wavelength within the wavelength band WB and light having a wavelength outside the wavelength band WB. The wavelength selection filter 120 selectively passes light within the wavelength band WB emitted from the light source 110a and light outside the wavelength band WB that is within the wavelength band WB.

[0113] The optical system 220-22 of the light receiving system 200-22 of the biosensor 10-22 has a lens 220f that guides light having wavelengths within the wavelength band WB that passes through the wavelength selection filter 120 and is reflected by each of the multiple sites of the living body LB to the light receiving element 210a corresponding to that site. In the biosensor 10-22 configured as above, light having a wavelength within the wavelength band WB among the light emitted from the light source 110a is irradiated onto the living body LB through the wavelength selection filter 120. The light within the wavelength band WB irradiated onto the living body LB and reflected from each of a plurality of parts of the living body LB is collected by the lens 220f onto the light receiving element 210a corresponding to the part. The biosensor 10-22 according to the nineteenth embodiment described above also has the same effects as the biosensor 10-19 according to the seventeenth embodiment.

[0114] (Biosensor according to Example 20) As shown in FIG. 28, the biosensor 10-23 of Example 20 has a similar configuration to the biosensor 10-19 of Example 17, except that the illumination system 100-5 has a light source 110b that emits only light within the wavelength band WB, and the light receiving system 200-23 does not have a wavelength selection filter.

[0115] That is, in the biosensor 10-23, the irradiated light includes only light with wavelengths within the wavelength band WB, and the optical system 220-5 of the light receiving system 200-23 has a lens 220f that guides the light with wavelengths within the wavelength band WB irradiated from the irradiation system 100-5 and reflected by each of the multiple parts of the living body LB to the light receiving element 210a corresponding to those parts.

[0116] In the biosensor 10-23 configured as above, light having a wavelength within the wavelength band WB emitted from the light source 110b is irradiated onto the living body LB as irradiation light. The light having a wavelength within the wavelength band WB irradiated onto the living body LB and reflected from each of the multiple parts of the living body LB is guided by the lens 220f to the corresponding light receiving element 210a. The biosensor 10-23 according to the embodiment 20 described above has the same effects as the biosensor 10-19 according to the embodiment 17, and can be made smaller in size since it does not have a wavelength selection filter.

[0117] 10.<Modifications of this technology>

[0118] The present technology is not limited to the configurations described in the examples and modified examples of the above embodiment, and can be modified as appropriate. For example, the configurations of the above-described embodiments and modified examples may be combined within a range that does not contradict each other.

[0119] For example, the optical system of the light receiving system of the biosensor according to the present technology may have a line sensor in which a plurality of light receiving elements (pixel sensors) are arranged one-dimensionally (in a line). In this case, a lens array in which a plurality of light receiving lenses are arranged in a line, a light shielding member in which a plurality of light guide paths are arranged in a line, or a single lens may be combined with the line sensor.

[0120] For example, the biosensors according to the second to twentieth embodiments may include a processing system 300-2 instead of the processing system 300-1.

[0121] For example, in the biosensor 10-4 according to the third embodiment (see FIG. 11), the wavelength selection filter 120 is disposed between the lens array 220a and the living body LB, but the wavelength selection filter 120 may be disposed between the light source 110a and the living body LB as in the modified example shown in FIG. 29. In the biosensor 10-8 according to the seventh embodiment (see FIG. 15) and the biosensor 10-22 according to the nineteenth embodiment (see FIG. 27), the wavelength selection filter 120 may be disposed similarly to FIG. 29. In the biosensor 10-12 according to the fourteenth embodiment (see FIG. 22), the wavelength selection filter 120 may be disposed between the light source 110a and the light guide plate 400.

[0122] The present technology can also be configured as follows. (1) an irradiation system that irradiates a living body with irradiation light including light having a wavelength within a wavelength band including a peak wavelength related to water absorption; a light receiving system that receives light having a wavelength within the wavelength band from the light irradiated from the irradiating system and reflected by each of the plurality of parts of the living body; a processing system that determines a state of the living body based on statistics regarding the signals for each part output from the light receiving system; A biosensor comprising: (2) The biosensor according to (1), wherein the processing system determines the state of the living body by using a first distribution which is a distribution of the number of signals for each signal value of the signals for each part. (3) The biosensor according to (2), wherein the processing system determines a state of the living organism from a feature of the first distribution. (4) The biosensor according to (3), wherein the feature of the first distribution is the number of signals whose signal values ​​for each of the parts are equal to or less than a reference value. (5) The biosensor according to (4), wherein the reference value is an average value of the signal values ​​of the signals for each of the parts. (6) The biosensor according to (3), wherein the feature of the first distribution is a median, an average, or a mode of the signal values ​​of the signals for each of the parts. (7) A biosensor described in any one of (2) to (6), wherein the processing system further uses a second distribution which is a distribution of the number of signals for each signal value of the signals for each of the multiple parts according to the reflectance distribution of the multiple parts themselves to determine the state of the living body. (8) The biosensor according to claim 7, wherein the processing system compares features of the first and second distributions to determine a state of the living organism. (9) The biosensor according to (8), wherein the feature of the second distribution is a feature corresponding to the feature of the first distribution. (10) The biosensor described in (8), wherein the characteristic of the first distribution is a ratio of the number of signals in the first distribution for each part whose signal values ​​match each of a plurality of values, and the characteristic of the second distribution is a ratio of the number of signals in the second distribution for each part whose signal values ​​match each of the plurality of values. (11) The biosensor according to any one of (1) to (10), wherein the light receiving system includes a light receiving element array including a plurality of light receiving elements respectively corresponding to the plurality of sites, and an optical system corresponding to the plurality of light receiving elements, and the optical system guides light having a wavelength within the wavelength band among the light irradiated from the illumination system and reflected by each of the plurality of sites to the light receiving element corresponding to the site. (12) The biosensor described in (11), wherein the irradiation light includes only light with wavelengths within the wavelength band, and the optical system has an optical element that guides light with wavelengths within the wavelength band that is irradiated from the irradiation system and reflected at the corresponding part to the corresponding light receiving element. (13) The biosensor described in (11), wherein the irradiated light includes light with wavelengths within the wavelength band and light with wavelengths outside the wavelength band, and the optical system has a wavelength selective filter that selectively passes light with wavelengths within the wavelength band among the light irradiated from the irradiation system and reflected by each of the multiple locations. (14) The biosensor according to (13), wherein the optical system has an optical member that guides light having a wavelength within the wavelength band that has passed through the wavelength selection filter to a corresponding light receiving element. (15) The biosensor according to (13), wherein the optical system has an optical member that guides light of a wavelength within the wavelength band to a corresponding light receiving element via the wavelength selection filter. (16) The biosensor described in (11), wherein the illumination system includes a light source that emits light of a wavelength within the wavelength band and light of a wavelength outside the wavelength band, and a wavelength selective filter that selectively passes light within the wavelength band among the light within the wavelength band and the light outside the wavelength band emitted from the light source. (17) The biosensor according to (16), wherein the optical system has an optical member that guides light of a wavelength within the wavelength band that passes through the wavelength selection filter and is reflected at the corresponding site to a corresponding light receiving element. (18) The biosensor described in (11), wherein the illumination system includes at least one light source disposed between two adjacent light receiving elements among the plurality of light receiving elements and emitting light including light having a wavelength within the wavelength band. (19) The biosensor described in (11) further comprising a light guide plate disposed between the optical system and the living body, the illumination system including a light source that emits light including light with wavelengths within the wavelength band, and the light guide plate guides at least light having a wavelength within the wavelength band among the light emitted from the light source, and causes the light within the wavelength band to be incident on each of the multiple sites. (20) The biosensor according to (19), wherein the light guide plate is transparent to light having wavelengths within the wavelength band. (21) The light guide plate has a plurality of diffractive portions on the optical system side, the diffractive portions corresponding to the plurality of light receiving elements, respectively. The biosensor according to (19) or (20), wherein each of the plurality of diffraction sections diffracts incident light having a wavelength within the wavelength band toward the corresponding portion. (22) The biosensor according to any one of (11) to (21), further comprising a circular polarizing plate disposed between the light receiving element array and the living body. (23) The biosensor according to any one of (1) to (22), wherein the state of the living body is a mental state estimated from a sweating state of each of the body parts. (24) This technology includes the steps of irradiating a living body with light having a wavelength within a wavelength band including a peak wavelength related to water absorption; a step of receiving light having a wavelength within the wavelength band from the light irradiated from the irradiation system and reflected by each of the multiple sites of the living body, and outputting a signal for each of the sites; determining a state of the living body based on statistics regarding the signals for each part output in the outputting step; The present invention provides a method for determining a biological condition, comprising: [Explanation of symbols]

[0123] 10-1 to 10-23: biosensors, 100-1, 100-4, 100-5, 100-11, 100-13: irradiation system, 110a, 110b: light source, 200-1, 200-2, 200-3, 200-4, 200-6, 200-7, 200-8, 200-9, 200-10, 200-11, 200-12, 200-13, 200-19, 200-20, 200-21, 200-22, 200-23: light receiving system, 210, 210-11, 210-13: light receiving element array, 210a: light receiving element, 220-1, 220-2, 220-3, 220-4, 220-6, 220-7, 220-8, 220-9, 220-10, 220-19, 220-20, 220-21, 220-22: optical system, 220a: lens array (optical component), 220a1: light receiving lens, 220b: wavelength selection filter, 220c: circular polarizing plate, 220d: light blocking component (optical component), 220f: lens (optical component), 300-1, 300-2: processing system, LB: living body, each of multiple parts: LB1 to LB6, IL: irradiation light.

Claims

1. an irradiation system that irradiates a living body with irradiation light including light having a wavelength within a wavelength band including a peak wavelength related to water absorption; a light receiving system that receives light having a wavelength within the wavelength band from the light irradiated from the irradiating system and reflected by each of the plurality of parts of the living body; a processing system that determines a state of the living body based on statistics regarding the signals for each part output from the light receiving system; Equipped with the processing system determines a state of the living body from a feature of a first distribution which is a distribution of the number of signals for each signal value of the signals for each part; A biosensor, wherein the characteristic amount of the first distribution is the number of signals whose signal values ​​for each of the parts are equal to or less than a reference value.

2. The biosensor according to claim 1 , wherein the reference value is an average value of the signal values ​​of the signals for each of the locations.

3. an irradiation system that irradiates a living body with irradiation light including light having a wavelength within a wavelength band including a peak wavelength related to water absorption; a light receiving system that receives light having a wavelength within the wavelength band from the light irradiated from the irradiating system and reflected by each of the plurality of parts of the living body; a processing system that determines a state of the living body based on statistics regarding the signals for each part output from the light receiving system; Equipped with the processing system determines a state of the living body from a feature of a first distribution which is a distribution of the number of signals for each signal value of the signals for each part; A biosensor, wherein the feature of the first distribution is a median, an average, or a mode of the signal values ​​of the signals for each of the parts.

4. The biosensor according to any one of claims 1 to 3, wherein the processing system further uses a second distribution which is a distribution of the number of signals for each signal value of the signals for each of the parts according to the reflectivity distribution of the multiple parts themselves to determine the state of the living organism.

5. The biosensor according to claim 4 , wherein the processing system compares the feature quantities of the first and second distributions to determine the state of the living body.

6. The biosensor according to claim 5 , wherein the feature amount of the second distribution corresponds to the feature amount of the first distribution.

7. an irradiation system that irradiates a living body with irradiation light including light having a wavelength within a wavelength band including a peak wavelength related to water absorption; a light receiving system that receives light having a wavelength within the wavelength band from the light irradiated from the irradiating system and reflected by each of the plurality of parts of the living body; a processing system that determines a state of the living body based on statistics regarding the signals for each part output from the light receiving system; Equipped with the processing system compares a feature of a first distribution, which is a distribution of the number of signals for each signal value of the signals for each site, with a feature of a second distribution, which is a distribution of the number of signals for each signal value of the signals for each site according to a reflectance distribution of the multiple sites themselves, to determine a state of the living body; the feature amount of the first distribution is a ratio of a number of signals whose signal values ​​match a plurality of values ​​among the signals for each of the parts in the first distribution, A biosensor, wherein the characteristic amount of the second distribution is a ratio of the number of signals whose signal values ​​match each of the multiple values ​​among the signals for each part in the second distribution.

8. an irradiation system that irradiates a living body with irradiation light including light having a wavelength within a wavelength band including a peak wavelength related to water absorption; a light receiving system that receives light having a wavelength within the wavelength band from the light irradiated from the irradiating system and reflected by each of the plurality of parts of the living body; a processing system that determines a state of the living body based on statistics regarding the signals for each part output from the light receiving system; Equipped with The light receiving system includes: a light receiving element array including a plurality of light receiving elements respectively corresponding to the plurality of portions; an optical system corresponding to the plurality of light receiving elements; Including, The optical system guides light having a wavelength within the wavelength band, among the light irradiated from the irradiation system and reflected by each of the plurality of sites, to the light receiving element corresponding to that site.

9. the illumination light includes only light having wavelengths within the wavelength band, The biosensor according to claim 8 , wherein the optical system includes an optical member that guides light having a wavelength within the wavelength band that is irradiated from the irradiation system and reflected by the corresponding portion to the corresponding light receiving element.

10. the illumination light includes light with a wavelength within the wavelength band and light with a wavelength outside the wavelength band, The biosensor according to claim 8 , wherein the optical system has a wavelength selection filter that selectively passes light having a wavelength within the wavelength band among the light irradiated from the irradiation system and reflected by each of the plurality of portions.

11. The biosensor according to claim 10 , wherein the optical system includes an optical member that guides light having a wavelength within the wavelength band that has passed through the wavelength selection filter to a corresponding light receiving element.

12. The biosensor according to claim 10 , wherein the optical system includes an optical member that guides light having a wavelength within the wavelength band to a corresponding light receiving element via the wavelength selection filter.

13. The illumination system comprises: a light source that emits light with a wavelength within the wavelength band and light with a wavelength outside the wavelength band; a wavelength selection filter that selectively passes light within the wavelength band among light within the wavelength band and light outside the wavelength band emitted from the light source; The biosensor according to claim 8 .

14. The biosensor according to claim 13 , wherein the optical system includes an optical member that guides light having a wavelength within the wavelength band that has passed through the wavelength selection filter and been reflected by the corresponding portion to a corresponding light receiving element.

15. The biosensor according to claim 8 , wherein the illumination system includes at least one light source disposed between two adjacent light receiving elements of the plurality of light receiving elements and configured to emit light including light having a wavelength within the wavelength band.

16. A light guide plate is further provided between the optical system and the living body. the illumination system includes a light source that emits light having a wavelength within the wavelength band; The biosensor according to claim 8 , wherein the light guide plate guides at least light having a wavelength within the wavelength band among the light emitted from the light source, and causes the light within the wavelength band to be incident on each of the plurality of portions.

17. The biosensor according to claim 16 , wherein the light guide plate is transparent to light with wavelengths within the wavelength band.

18. the light guide plate has a plurality of diffractive portions on the optical system side, the diffractive portions corresponding to the plurality of light receiving elements, The biosensor according to claim 16 , wherein each of the plurality of diffractive sections diffracts incident light having a wavelength within the wavelength band toward the corresponding portion.

19. The biosensor according to any one of claims 8 to 18, further comprising a circular polarizing plate disposed between the light receiving element array and the living body.

20. an irradiation system that irradiates a living body with irradiation light including light having a wavelength within a wavelength band including a peak wavelength related to water absorption; a light receiving system that receives light having a wavelength within the wavelength band from the light irradiated from the irradiating system and reflected by each of the plurality of parts of the living body; a processing system that determines a state of the living body based on statistics regarding the signals for each part output from the light receiving system; Equipped with The biological condition of the living body is a mental state estimated from the sweating state of each of the body parts.

Images