Detection device and measuring device

Abstract

The present application provides a detection device and a measuring device, which can miniaturize the device structure. The detection device of the present application has a first light emitting portion which emits a first light having a green wavelength band, a second light emitting portion which emits a second light having a wavelength band longer than the green wavelength band, and a light receiving portion which receives the first light and the second light emitted from the first light emitting portion and the second light emitting portion and emitted from a living body, respectively. The light receiving portion has a first light receiving area which receives the first light, a second light receiving area which is provided at a position farther from the first light emitting portion than the first light receiving area and receives the second light, and a first optical filter which is provided in either one of the first light receiving area and the second light receiving area and selectively transmits light of a corresponding wavelength band.

Description

TECHNICAL FIELD

[0001] The present application relates to a detection device and a measurement device. BACKGROUND

[0002] Various measurement techniques of measuring biological information such as a pulse non-invasively have been proposed in the past. For example, a technique is disclosed in Patent Literature 1 in which, in a detection device having a light emitting portion that emits light to a living body and a light receiving portion that receives light emitted from the light emitting portion and incident by being reflected by the living body, by providing a light shielding member between the light emitting portion and the light receiving portion, light utilization efficiency of the light emitting portion is improved and a countermeasure against stray light of the light receiving portion is taken.

[0003] Patent Literature 1: Japanese Patent Application Publication No. 2018-061675

[0004] However, in the above detection device, since a plurality of light receiving portions that receive light reflected by a living body are required to be provided, there is a problem that it is not possible to downsize the device structure. SUMMARY

[0005] According to one embodiment of the present application, there is provided a detection device including: a first light emitting portion that emits first light having a green wavelength band; a second light emitting portion that emits second light having a wavelength band longer than the green wavelength band; and a light receiving portion that receives the first light and the second light emitted from the first light emitting portion and the second light emitting portion and emitted from a living body, the light receiving portion including: a first light receiving region that receives the first light; a second light receiving region that is provided at a position farther from the first light emitting portion than the first light receiving region and receives the second light; and a first optical filter that is provided in either one of the first light receiving region and the second light receiving region and selectively transmits light of a corresponding wavelength band.

[0006] According to one embodiment of the present application, there is provided a measurement device including: the detection device according to the above embodiment; and an information analysis portion that determines biological information based on a detection signal that indicates a detection result of the detection device. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 is a side view of a measurement device of the first embodiment.

[0008] Figure 2 is a structure diagram focusing on a function of the measurement device.

[0009] Figure 3 is a plan view of a detection device.

[0010] Figure 4 is a cross-sectional view based on the IV-IV line arrow in Figure 3 is a cross-sectional view based on the IV-IV line arrow in

[0011] Figure 5 It is a graph representing the transmission spectrum of the skin.

[0012] Figure 6 It is a graph showing the relationship between the red emitting part and the receiving part.

[0013] Figure 7 This is a diagram used to illustrate the function of the detection device.

[0014] Figure 8 This is a cross-sectional view of the detection device according to the second embodiment.

[0015] Figure 9 This is a cross-sectional view of the detection device according to the third embodiment.

[0016] Figure 10 This is a cross-sectional view of the detection device of a modified example of the third embodiment.

[0017] Label Explanation

[0018] 3, 103, 203, 303: Detection device; 5: Control device (information analysis unit); 12: Light receiving unit; 50: First light emitting unit; 51: First light receiving area; 60: Second light emitting unit; 61: Second light receiving area; 70: Third light emitting unit; 100: Measuring device; 122, 222: Bandpass filter (first filter); 322: Bandpass filter (second filter); H1, H2: Width; LG: Green light (first light); LR: Red light (second light); LI: Near-infrared light (third light); M: Measurement site (organism). Detailed Implementation

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Furthermore, in the following figures, the dimensions and angles of each component are different from their actual sizes in order to make each component identifiable.

[0020] (First Embodiment)

[0021] Figure 1 This is a side view of the measuring device 100 according to the first embodiment. Figure 1The measuring device 100 of this embodiment shown is a non-invasive biometric device that measures the biometric information of a subject (e.g., a human), an example of a living organism, and is worn on a part of the subject's body that is the measurement target (hereinafter referred to as the "measurement site") M. The measuring device 100 of this embodiment is a wristwatch-type portable device having a housing 1 and a strap 2. The measuring device 100 can be worn on the wrist of the subject by wrapping the strap 2 around the wrist, an example of the measurement site (biological organism) M. In this embodiment, the subject's pulse (e.g., pulse interval PPI) and oxygen saturation (SpO2) are exemplified as biometric information. Pulse refers to the time-varying volume change within blood vessels that is linked to the heartbeat. Oxygen saturation refers to the percentage (%) of oxygen-bound hemoglobin in the subject's blood, and is an indicator used to evaluate the subject's respiratory function.

[0022] Figure 2 This is a structural diagram focusing on the function of the measuring device 100. For example... Figure 2 As shown, the measuring device 100 of this embodiment includes a control device 5, a storage device 6, a display device 4, and a detection device 3. The control device 5 and the storage device 6 are disposed inside the housing 1. Figure 1 As shown, the display device 4 is disposed on the surface of the housing 1 on the side opposite to the measuring part M, and displays various images, including the measurement results, under the control of the control device 5. The display device 4 is, for example, a liquid crystal display panel.

[0023] The detection device 3 is an optical sensor module that generates a detection signal S corresponding to the state of the measurement part M. For example... Figure 1 As shown, the detection device 3 is, for example, disposed on a facing surface (hereinafter referred to as the detection surface) 16 in the housing portion 1 opposite the measuring portion M. The detection surface 16 is the surface that contacts the measuring portion M. Figure 2 As shown, the detection device 3 of this embodiment includes a light-emitting unit 11, a light-receiving unit 12, a driving circuit 13, and an output circuit 14. Furthermore, one or both of the driving circuit 13 and the output circuit 14 can be configured as external circuitry of the detection device 3. That is, the driving circuit 13 and the output circuit 14 can be omitted from the detection device 3.

[0024] Figure 3 This is a top view of the detection device 3. Figure 4 Based on Figure 3 A cross-sectional view of the arrowhead along line IV-IV. (See attached image.) Figure 3 as well as Figure 4 As shown, the detection device 3 of this embodiment, in addition to the light-emitting unit 11 and the light-receiving unit 12, also includes a housing 40, a light-shielding wall 41, and a sealing layer 42. Furthermore, in Figure 3as well as Figure 4 The diagrams of the drive circuit 13 and the output circuit 14 are omitted in the original text.

[0025] The structure of the detection device 3 will now be described using the XYZ coordinate system. The X-axis is equivalent to the axis along the long side (one side) of the housing 40 with a rectangular shape, the Y-axis is equivalent to the axis perpendicular to the X-axis and along the short side (the other side) of the housing 40, and the Z-axis is equivalent to the axis perpendicular to both the X-axis and the Y-axis and along the normal to the detection surface 16 that contacts the measurement part M.

[0026] like Figure 3 and Figure 4 As shown, the housing 40 is a component that houses the various elements constituting the detection device 3 (the light-emitting unit 11 and the light-receiving unit 12). The housing 40 has a box shape and includes a rectangular flat bottom portion 40a and a rectangular frame-shaped side plate portion 40b protruding from the periphery of the bottom portion 40a towards the +Z side. The housing 40 is made of aluminum, for example. The inner peripheral surface 40b1 of the side plate portion 40b is colored black to provide light-blocking properties. This suppresses reflection at the inner peripheral surface 40b1 of the side plate portion 40b.

[0027] Furthermore, the material and manufacturing method of the housing 40 are arbitrary. For example, the housing 40 can also be formed by injection molding of resin material. In addition, it is preferable that the housing 40 is integrally formed with the housing part 1.

[0028] The light-emitting unit 11 and the light-receiving unit 12 are mounted on the bottom surface 40a of the housing 40, mounted on a wiring substrate (not shown). A light-shielding wall 41 is disposed between the light-emitting unit 11 and the light-receiving unit 12 along the X-axis. The light-shielding wall 41 is a plate-shaped component that protrudes from the bottom surface 40a toward the +Z side and extends along the Y-axis, dividing the storage space within the housing 40 into two parts in the X-axis direction. That is, the light-shielding wall 41 is a component that separates the space housing the light-emitting unit 11 and the light-receiving unit 12 along the X-axis direction. The light-shielding wall 41 is a light-shielding component used to block light so that light emitted from the light-emitting unit 11 does not directly incident on the light-receiving unit 12.

[0029] In this embodiment, the light-shielding wall 41 is disposed in the direction along the X-axis between the light-emitting unit 11, which includes the first light-emitting part 50 and the second light-emitting part 60, and the light-receiving part 12. The light-shielding wall 41 can also be described as a component that blocks a portion of green light LG, red light LR, and near-infrared light LI.

[0030] The sealing layer 42 is a light-transmitting resin material that fills the gap between the light-emitting unit 11 and the light-receiving unit 12 housed within the housing 40 and the side plate 40b. The sealing layer 42 seals (molds) the light-emitting unit 11 and the light-receiving unit 12 within the housing 40. The surface of the sealing layer 42 functions as the detection surface 16.

[0031] Alternatively, instead of the structure sealed by the sealing layer 42, a structure in which the upper surface of the side plate portion 40b of the housing 40 is covered by a light-transmitting substrate can be used. In this case, the upper surface of the light-transmitting substrate functions as the detection surface 16.

[0032] The light-emitting unit 11 includes a first light-emitting part 50, a second light-emitting part 60, and a third light-emitting part 70. The first light-emitting part 50, the second light-emitting part 60, and the third light-emitting part 70 are light sources that emit light of different wavelengths relative to the measuring part M.

[0033] The first light-emitting unit 50 emits green light (first light) LG with a green wavelength of 520nm to 550nm toward the measurement unit M. In this embodiment, the green light LG is, for example, light with a peak wavelength of 520nm.

[0034] The second light-emitting part 60 emits, for example, red light (second light) LR with a red wavelength of 600nm to 800nm ​​toward the measurement part M. In this embodiment, the red light LR is, for example, light with a peak wavelength of 660nm.

[0035] The third light-emitting part 70 emits, for example, near-infrared light (third light) LI with a near-infrared wavelength of 800 nm to 1300 nm toward the measurement part M. In this embodiment, the near-infrared light LI is, for example, light with a peak wavelength of 905 nm.

[0036] The light-emitting elements constituting the first light-emitting part 50, the second light-emitting part 60, and the third light-emitting part 70 are preferably, for example, bare-chip type or bullet-type LEDs (Light Emitting Diodes). Furthermore, the wavelength of the light emitted by each light-emitting part is not limited to the aforementioned numerical range. Hereinafter, without specifically distinguishing between the first light-emitting part 50, the second light-emitting part 60, and the third light-emitting part 70, they will be collectively referred to as light-emitting parts 50, 60, and 70.

[0037] The light-emitting unit 11 is disposed within the housing 40 such that the light-emitting surfaces of each light-emitting part 50, 60, and 70 are parallel to the XY plane. That is, each light-emitting part 50, 60, and 70 emits light toward the +Z side.

[0038] Each light-emitting part 50, 60, and 70 is emitted from... Figure 2The driving circuit 13 shown is supplied with driving current and emits light. In this embodiment, the driving circuit 13 causes each light-emitting part 50, 60, and 70 to emit light independently in a time sequence. Hereinafter, the method of causing each light-emitting part 50, 60, and 70 to emit light independently in a time sequence will be referred to as light-emitting parts 50, 60, and 70 emitting light in a time sequence.

[0039] Light emitted from each of the light-emitting units 50, 60, and 70 is incident on the measuring part M, and after being repeatedly reflected and scattered inside the measuring part M, it is emitted to the housing part 1 and reaches the light-receiving part 12. That is, the detection device 3 of this embodiment is a reflective optical sensor in which the light-emitting unit 11 and the light-receiving part 12 are located on one side relative to the measuring part M.

[0040] like Figure 3 As shown, the light-emitting portions 50, 60, and 70 are arranged at intervals along the Y-axis (first direction). Specifically, the second light-emitting portion 60 is disposed on the +Y side of the first light-emitting portion 50, and the third light-emitting portion 70 is disposed on the -Y side of the first light-emitting portion 50. That is, the first light-emitting portion 50 is disposed between the second light-emitting portion 60 and the third light-emitting portion 70 along the Y-axis. Alternatively, it can be said that the first light-emitting portion 50 is located between the second light-emitting portion 60 and the third light-emitting portion 70.

[0041] Furthermore, in conventional detection devices used for measurement, when acquiring pulse interval (PPI) and oxygen saturation (SpO2) as biological information of the subject, separate light-receiving units are provided for determining pulse (green light-receiving unit) and for determining oxygen saturation (red and near-infrared light-receiving units). Therefore, due to the large size of detection devices, it is difficult to miniaturize measurement devices.

[0042] In recent years, there has been a desire for further miniaturization of measuring devices. Against this backdrop, the inventors have conducted in-depth research on a small detection device capable of obtaining both pulse interval and oxygen saturation.

[0043] First, the inventors focused on the fact that the skin's transmittance varies according to each wavelength of light.

[0044] Figure 5 It is a graph representing the transmission spectrum of the skin. Figure 5 In the diagram, the horizontal axis represents the wavelength of light, and the vertical axis represents the transmittance (unit: %). Figure 5 As an example, the transmissive area is shown when the skin thickness is 0.43 mm.

[0045] like Figure 5As shown, the transmittance of green light (LG) in the wavelength range (e.g., 520 nm) incident on the skin is about 30%, the transmittance of red light (LR) in the wavelength range (e.g., 660 nm) incident on the skin is about 50% to 60%, and the transmittance of near-infrared light (LI) in the wavelength range (e.g., 905 nm) incident on the skin is about 60%.

[0046] Figure 5 The graph shown illustrates that the distance a light can travel within a living organism varies depending on the wavelength of each light. That is, according to... Figure 5 The graph shows that green light LG can only travel a shorter distance within a living organism compared to red light LR or near-infrared light LI. In other words, red light LR and near-infrared light LI can travel farther within a living organism compared to green light LG. Furthermore, in... Figure 5 The example given is a skin thickness of 0.43 mm. However, even with varying skin thicknesses, red light (LR) and near-infrared light (LI) can travel further within the body than green light (LG).

[0047] The inventors have obtained the following insights: Figure 5 As shown in the curve, green light LG is more easily attenuated when passing through biological bodies compared to red light LR and near-infrared light LI.

[0048] Furthermore, the inventors simulated the incident state of green light passing through a biological body onto the light-receiving part. Additionally, a conventionally sized light-receiving part was used as the simulation condition.

[0049] The simulation results show that the green light LG is well incident on the region of the light-receiving part closest to the light-emitting part, but it is not efficiently incident on the region of the light-receiving part furthest from the light-emitting part. This is because the green light is attenuated before it reaches the region furthest from the light-emitting part.

[0050] The inventors have obtained the following insight: Since green light LG passing through a living organism is easily attenuated, it is sufficient to simply place the light-receiving area that receives green light LG near the light-emitting part.

[0051] Furthermore, the inventors considered the following situation: the noise component contained in red light LR or near-infrared light LI that propagates within a living organism and is incident on the light-receiving part varies with the distance from the light-emitting part to the light-receiving part. The following explanation uses red light LR as an example, but the same principle applies to near-infrared light LI.

[0052] Figure 6 This is a graph showing the relationship between the distance from the red light-emitting part to the light-receiving part, the noise component of the red light, and the current consumed by the red light-emitting part.Figure 6 In the diagram, the horizontal axis represents the distance from the red light-emitting part to the light-receiving part, the vertical axis on the left represents the noise component of the red light LR, and the vertical axis on the right represents the current consumed by the light-emitting part.

[0053] like Figure 6 As shown, the closer the light-receiving part is to the light-emitting part, the greater the noise component of the red light (LR) received by the light-receiving part. That is, the farther the light-receiving part is positioned from the light-emitting part, the lower the noise component of the red light (LR), thereby improving the detection accuracy of the red light (LR). This is because, for a light-receiving part positioned close to the light-emitting part, red light components that are reflected by the surface of the organism but do not pass through the blood will be incident. These red light (LR) components that do not pass through the blood become noise components in the light-receiving part when determining blood oxygen concentration.

[0054] Therefore, by displacing the light-receiving part and the light-emitting part far apart, the noise component contained in the red light LR can be reduced, and the detection accuracy of the red light LR can be improved. On the other hand, when the light-receiving part is disposed far away from the light-emitting part, the distance it travels within the biological body increases, thus requiring an increase in the current supplied to the light-emitting part to increase the brightness of the red light. In this case, since the current consumption of the light-emitting part increases, it is preferable to consider the balance between noise components and current consumption when determining the distance between the light-emitting part and the light-receiving part. For example, in this embodiment, the distance between the light-receiving part and the red light-emitting part is set to the distance at which the curve representing noise components intersects with the curve representing current consumption.

[0055] Furthermore, regarding near-infrared light LI, similarly to red light LR, the detection accuracy of near-infrared light LI can be improved by positioning the light-emitting and light-receiving parts for emitting near-infrared light LI further apart. Additionally, the distance between the light-emitting and light-receiving parts for near-infrared light is preferably determined by considering the balance between noise components and current consumption.

[0056] The inventors have obtained the following insight: by configuring the light-receiving area that receives red light (LR) or near-infrared light (LI) as far away from the light-emitting part as possible, the detection accuracy of the light-receiving part can be improved.

[0057] Based on the above insights, the inventors have completed the detection device 3 and measuring device 100 of this embodiment. In the detection device 3 of this embodiment, the following structure is adopted: the light-receiving area of ​​the conventionally used light-receiving part 12 is divided into two parts, one area close to the light-emitting part is used as the light-receiving area for green light, and the other area far from the light-emitting part is used as the light-receiving area for red / near-infrared light.

[0058] The structure of the light-receiving part 12 in this embodiment will be described below.

[0059] The light-receiving unit 12 receives light arriving from the measuring unit M through the light emitted by the light-emitting unit 11. In this embodiment, the light-receiving unit 12 has a first light-receiving region 51 and a second light-receiving region 61. The light-receiving unit 12 generates detection signals corresponding to the intensity of the light received in the first light-receiving region 51 and the second light-receiving region 61, respectively. Hereinafter, without specifically distinguishing between the first light-receiving region 51 and the second light-receiving region 61, they will be collectively referred to as "light-receiving regions 51 and 61".

[0060] The light-receiving part 12 is disposed within the housing 40 such that the light-receiving surfaces of each light-receiving area 51, 61 are parallel to the XY plane. That is, each light-receiving area 51, 61 receives light incident from the Z direction.

[0061] like Figure 3 As shown, the light-receiving regions 51 and 61 are spaced apart from each other and arranged in a direction (second direction) along the X-axis, which intersects (perpendiculars) the Y-axis. Specifically, the first light-receiving region 51 is located on the +X side of the light-emitting unit 11, and the second light-receiving region 61 is located on the +X side of the first light-receiving region 51. The second light-receiving region 61 is disposed on the side opposite to the light-emitting unit 11, separated from the first light-receiving region 51. In this embodiment, the second light-receiving region 61 is located further away from the first light-emitting unit 50 than the first light-receiving region 51. Specifically, the first light-receiving region 51 is closer to the first light-emitting unit 50 in the direction along the X-axis than the second light-receiving region 61.

[0062] Here, the distance from the first light-emitting part 50 to the first light-receiving area 51 is defined as D1, the distance from the second light-emitting part 60 to the second light-receiving area 61 is defined as D2, and the distance from the third light-emitting part 70 to the second light-receiving area 61 is defined as D3. Distance D1 corresponds to the distance between the centers of the first light-emitting part 50 and the first light-receiving area 51 when viewed from above along the Z-axis. Similarly, distance D2 corresponds to the distance between the centers of the second light-emitting part 60 and the second light-receiving area 61 when viewed from above along the Z-axis. Likewise, distance D3 corresponds to the distance between the centers of the third light-emitting part 70 and the second light-receiving area 61 when viewed from above along the Z-axis.

[0063] In the detection device 3 of this embodiment, the distance D1 from the first light-emitting part 50 to the first light-receiving area 51 is shorter than the distance D2 from the second light-emitting part 60 to the second light-receiving area 61. Furthermore, the distance D1 from the first light-emitting part 50 to the first light-receiving area 51 is shorter than the distance D3 from the third light-emitting part 70 to the second light-receiving area 61. Additionally, distances D2 and D3 are equal.

[0064] Thus, in the detection device 3 of this embodiment, a structure is adopted in which a first light-receiving region 51 for receiving the green light LG is arranged at a position closest to the first light-emitting part 50 that emits green light LG.

[0065] In this embodiment, the first light-receiving region 51 and the second light-receiving region 61 are each composed of a region that divides the light incident region of the light-receiving unit 12 into two parts. The areas of the first light-receiving region 51 and the second light-receiving region 61 are equal. The first light-receiving region 51 has a planar area capable of receiving approximately 80% of the light intensity of the green light LG after passing through the organism. According to the light-receiving unit 12 of this embodiment, the green light LG after passing through the organism is incident on the first light-receiving region 51 with sufficient light intensity. Therefore, the detection device 3 of this embodiment does not need to increase the current consumption of the first light-emitting unit 50 in order to increase the light emission intensity of the green light LG, thus enabling low power consumption of the light-emitting unit 11.

[0066] like Figure 4 As shown, the light-receiving part 12 includes a light-receiving element 120, an angle-limiting filter 121, and a bandpass filter (first filter) 122.

[0067] The light-receiving element 120 is, for example, a photodiode (PD). The angle-limiting filter 121 is configured to cover the entire light-receiving surface 120a of the light-receiving element 120. The angle-limiting filter 121 is formed, for example, by embedding a plug 1212 made of a light-shielding material such as tungsten within a light-transmitting silicon oxide layer 1211.

[0068] The silicon oxide layer 1211 forms an optical path that guides light to the light-receiving surface 120a of the light-receiving element 120. A plug 1212 embedded in the silicon oxide layer 1211 restricts the incident angle of light passing through the optical path (silicon oxide layer 1211). That is, when light incident on the silicon oxide layer 1211 is tilted at a predetermined angle relative to the optical path, the incident light irradiates the plug 1212, a portion of which is absorbed by the plug 1212, and the remainder is reflected. Moreover, because the light is repeatedly reflected before passing through the optical path, the intensity of the reflected light weakens, thus the light that can ultimately pass through the angle-limiting filter 121 is substantially limited to light tilted within a predetermined limiting angle relative to the optical path.

[0069] The angle-limiting filter 121 has the following characteristics: it allows light incident at an angle smaller than a predetermined angle of incidence to pass through, and blocks light incident at an angle larger than a predetermined angle of incidence. Thus, the angle-limiting filter 121 can limit the angle of incidence of light incident on the light-receiving element 120. Specifically, the angle-limiting filter 121 allows light incident at a predetermined angle of incidence (hereinafter referred to as the permissible angle of incidence) that propagates within the living organism to pass through, while blocking light incident at an angle larger than the permissible angle of incidence, such as external light like sunlight or light that does not enter the living organism.

[0070] A bandpass filter 122 is disposed in the region corresponding to the first light-receiving region 51 in the light-receiving surface 120a of the light-receiving element 120. The bandpass filter 122 has the characteristic of selectively allowing the green light LG band to pass through, while absorbing and blocking red light LR and near-infrared light LI, which are light in other bands. The bandpass filter 122 is formed, for example, by alternately stacking multiple low-refractive-index layers such as silicon oxide and high-refractive-index layers such as titanium oxide on an angle-limiting filter 121. Furthermore, the bandpass filter 122 is formed in the region corresponding to the first light-receiving region 51 using conventional photolithography processes.

[0071] On the other hand, in the light-receiving section 12, a bandpass filter that selectively allows red light LR or near-infrared light LI to pass through is not provided in the second light-receiving region 61; instead, only an angle-limiting filter 121 is provided. Therefore, in the second light-receiving region 61, the light-receiving section 12 can limit the incident angle of red light LR or near-infrared light LI reaching the light-receiving element 120. The angle-limiting filter 121, for example, allows red light LR or near-infrared light LI that propagates within a living organism and is incident at an allowed incident angle to pass through, while blocking external light such as sunlight and red light LR or near-infrared light LI that does not pass through the living organism and is incident at an angle larger than the allowed incident angle.

[0072] like Figure 2 As shown, in this embodiment, the light-receiving unit 12 receives each light synchronously with the light-emitting units 50, 60, and 70, which are driven in a time-division manner, and generates a detection signal corresponding to each light.

[0073] The light-receiving unit 12 sends the detection signals generated in each light-receiving area 51, 61 to the output circuit 14. The output circuit 14 is configured to include, for example, an A / D converter that converts the detection signals generated in each light-receiving area 51, 61 from analog to digital; and an amplifier circuit that amplifies the converted detection signals (all omitted from the figure). The output circuit 14 generates multiple detection signals S (S1, S2, S3) corresponding to different wavelengths.

[0074] Here, detection signal S1 is a signal representing the light intensity of the first light-receiving region 51 when green light LG emitted from the first light-emitting unit 50 is received. Detection signal S2 is a signal representing the light intensity of the second light-receiving region 61 when red light LR emitted from the second light-emitting unit 60 is received. Detection signal S3 is a signal representing the light intensity of the second light-receiving region 61 when near-infrared light LI emitted from the third light-emitting unit 70 is received.

[0075] Typically, the amount of light absorbed by blood differs during vasodilation and vasoconstriction. Therefore, each detection signal S becomes a pulse signal containing a periodic variation component corresponding to the pulsating component (volume pulse) of the artery within the measurement site M.

[0076] Furthermore, the driving circuit 13 and the output circuit 14 are mounted on the wiring substrate together with the light-emitting unit 11 and the light-receiving unit 12 in the form of IC chips. Additionally, as described above, the driving circuit 13 and the output circuit 14 can also be disposed outside the detection device 3.

[0077] The control device 5 is a processing unit such as a CPU (Central Processing Unit) or FPGA (Field-Programmable Gate Array), controlling the entire measuring device 100. The storage device 6, for example, is composed of a non-volatile semiconductor memory, storing the program executed by the control device 5 and various data used by the control device 5. Alternatively, a structure can be adopted that distributes the functions of the control device 5 across multiple integrated circuits, or a structure that implements some or all of the functions of the control device 5 through dedicated electronic circuits. Furthermore, in Figure 2 In the illustration, the control device 5 and the storage device 6 are shown as separate elements, but the control device 5 with the built-in storage device 6 can also be implemented by means of, for example, ASIC (Application Specific Integrated Circuit).

[0078] In this embodiment, the control device 5 determines the biological information of the subject by executing a program stored in the storage device 6 based on multiple detection signals S (S1, S2, S3) generated by the detection device 3.

[0079] Specifically, the control device (information analysis unit) 5 determines the subject's pulse based on the detection signal S1, which represents the intensity of the green light LG received by the first light-receiving region 51. For example, the control device 5 can determine the subject's pulse interval (PPI) based on the detection signal S1. Furthermore, the control device 5 can determine the subject's oxygen saturation (SpO2) by analyzing the detection signal S2, which represents the intensity of the red light LR received by the second light-receiving region 61, and the detection signal S3, which represents the intensity of the near-infrared light LI received by the second light-receiving region 61.

[0080] As described above, in the measuring device 100, the control device 5 functions as an information analysis unit, determining biological information based on the detection signal S, which represents the detection result of the detection device 3. The control device 5 causes the display device 4 to display the biological information determined based on the detection signal S. Furthermore, the measurement results can also be communicated to the user via sound output. A structure that issues a warning to the user (possibility of bodily dysfunction) when the pulse rate or oxygen saturation changes outside a predetermined range is also preferred.

[0081] Figure 7 This is a diagram used to illustrate the function of the detection device 3.

[0082] like Figure 7 As shown, in the detection device 3 of this embodiment, a portion of the green light LG emitted from the first light-emitting unit 50 is reflected, for example, by the surface of a biological body (measurement part M), thus resulting in a situation where it directly enters the first light-receiving area 51 without passing through the biological body. Additionally, there are cases where external light, such as sunlight, directly enters the first light-receiving area 51 through the gap between the biological body and the detection surface 16. Hereinafter, the green light LG that enters the first light-receiving area 51 without passing through the biological body will be referred to as the "first stray light component SL1," and the external light that directly enters the first light-receiving area 51 will be referred to as the "second stray light component SL2."

[0083] The first stray light component SL1, having a green wavelength, passes through the bandpass filter 122 and is incident on the angle-limiting filter 121 located below the bandpass filter 122. As described above, the angle-limiting filter 121 has the following characteristics: it allows light incident at an angle smaller than the permissible incident angle to pass through, and blocks light incident at an angle larger than the permissible incident angle.

[0084] The first stray light component SL1 enters the first light-receiving region 51 without passing through the biological body. Therefore, the incident angle of green light LG relative to the first light-receiving region 51 is greater than the allowable incident angle of the angle-limiting filter 121. That is, the first stray light component SL1 is blocked by the angle-limiting filter 121. Thus, the first light-receiving region 51 can suppress the incident of the first stray light component SL1 onto the light-receiving surface 120a of the light-receiving element 120 by the angle-limiting filter 121.

[0085] The second stray light component SL2 is substantially blocked by the bandpass filter 122, but the component with a green band included in the second stray light component SL2 can pass through the bandpass filter 122. Here, as described above, since the second stray light component SL2 is incident from the gap between the organism and the detection surface 16, the incident angle of the second stray light component SL2 relative to the first light-receiving region 51 is greater than the allowable incident angle of the angle limiting filter 121. Therefore, a portion of the second stray light component SL2 (the component with a green band) that passes through the bandpass filter 122 is blocked by the angle limiting filter 121. Thus, the first light-receiving region 51 can suppress the incident of the second stray light component SL2 onto the light-receiving surface 120a of the light-receiving element 120 by the angle limiting filter 121.

[0086] Thus, in the detection device 3 of this embodiment, the green light LG emitted from the light-emitting unit 11 and passing through the organism can be efficiently incident on the light-receiving surface 120a of the light-receiving element 120. In addition, in the detection device 3 of this embodiment, the first stray light component SL1 and the second stray light component SL2 are made less likely to be incident on the light-receiving surface 120a of the light-receiving element 120.

[0087] Therefore, by suppressing the incidence of the first stray light component SL1 and the second stray light component SL2, which constitute noise components, the first light-receiving region 51 can achieve a high signal-to-noise ratio (S / N ratio). Thus, the detection device 3 of this embodiment can receive green light LG with high precision in the first light-receiving region 51, thereby suppressing the amount of green light LG emitted in the first light-emitting unit 50 and consequently reducing the power consumption of the light-emitting unit 11.

[0088] Furthermore, there are cases where a portion of the red light LR emitted from the second light-emitting unit 60 or a portion of the near-infrared light LI emitted from the third light-emitting unit 70 directly enters the second light-receiving area 61 without passing through the biological body. Additionally, there are cases where external light, such as sunlight, directly enters the second light-receiving area 61 through the gap between the biological body and the detection surface 16. Hereinafter, the red light LR or near-infrared light LI that directly faces the second light-receiving area 61 without passing through the biological body will be collectively referred to as "third stray light component SL3," and the external light that directly faces the second light-receiving area 61 will be referred to as "fourth stray light component SL4."

[0089] The third stray light component SL3 enters the angle-limiting filter 121 without passing through the biological body. Therefore, the incident angle of the third stray light component SL3 relative to the second light-receiving region 61 is greater than the allowable incident angle of the angle-limiting filter 121. In addition, since the fourth stray light component SL4 enters from the gap between the biological body and the detection surface 16, the incident angle of the fourth stray light component SL4 relative to the second light-receiving region 61 is greater than the allowable incident angle of the angle-limiting filter 121.

[0090] Therefore, the third stray light component SL3 and the fourth stray light component SL4 are effectively blocked by the angle limiting filter 121. As a result, the second light-receiving region 61 can suppress the third stray light component SL3 and the fourth stray light component SL4 from incident on the light-receiving surface 120a of the light-receiving element 120 by the angle limiting filter 121.

[0091] Thus, in the detection device 3 of this embodiment, red light LR or near-infrared light LI emitted from the light-emitting unit 11 and passing through the organism can be efficiently incident on the light-receiving surface 120a of the light-receiving element 120. In addition, in the detection device 3 of this embodiment, the third stray light component SL3 and the fourth stray light component SL4 are made less likely to be incident on the light-receiving surface 120a of the light-receiving element 120.

[0092] Therefore, by suppressing the incidence of the third stray light component SL3 and the fourth stray light component SL4, which constitute noise components, the second light-receiving region 61 can achieve a high signal-to-noise ratio (S / N ratio). According to the detection device 3 of this embodiment, since the red light LR and near-infrared light LI are efficiently received in the second light-receiving region 61, the power consumption of the light-emitting unit 11 can be suppressed by suppressing the emission amounts of the second light-emitting unit 60 and the third light-emitting unit 70.

[0093] Furthermore, in the detection device 3 of this embodiment, the distance (distance D2 or distance D3) between the second light-emitting part 60 and the third light-emitting part 70 and the second light-receiving area 61 is greater than the distance D1 between the first light-emitting part 50 and the first light-receiving area 51. That is, the distance that red light LR and near-infrared light LI travel in the biological body before incident on the second light-receiving area 61 is greater than the distance that green light LG travels in the biological body before incident on the first light-receiving area 51.

[0094] like Figure 4 As shown, regarding red light (LR) or near-infrared light (LI), the longer the propagation distance within the organism, the less noise components are reflected by the surface of the organism and do not pass through the blood, i.e., the less noise components are used to determine the oxygen concentration in the blood. Therefore, the second light-receiving region 61 can obtain a high signal-to-noise ratio by suppressing the incidence of noise components. Therefore, the detection device 3 of this embodiment can receive red light (LR) or near-infrared light (LI) with high precision in the second light-receiving region 61.

[0095] On the other hand, if the propagation distance of red light (LR) or near-infrared light (LI) within a living organism is too long, it is necessary to increase the luminous intensity of the second luminescent portion 60 or the third luminescent portion 70. In this embodiment, a second light-receiving region 61 is formed on the light-receiving surface 120a of a single light-receiving element 120 together with the first light-receiving region 51, and the second light-receiving region 61 is arranged as close as possible to the second luminescent portion 60 and the third luminescent portion 70. This ensures the light-receiving accuracy of red light (LR) and near-infrared light (LI) and suppresses the power consumption of the second luminescent portion 60 or the third luminescent portion 70, thereby suppressing the power consumption of the luminescent unit 11.

[0096] Furthermore, in this embodiment, since only red light LR and near-infrared light LI are incident on the second light-receiving region 61, a bandpass filter that selectively allows red light LR and near-infrared light LI to pass through while blocking green light LG is not provided in the second light-receiving region 61. That is, in the detection device 3 of this embodiment, a structure can be adopted in which only the first light-receiving region 51 includes a bandpass filter 122 and the second light-receiving region 61 does not include a bandpass filter. Therefore, the detection device 3 of this embodiment can reduce costs by omitting the bandpass filter in the second light-receiving region 61.

[0097] As described above, according to the detection device 3 of this embodiment, even when the light emission of each light-emitting part 50, 60, 70 is suppressed to achieve low power consumption of the light-emitting unit 11, light passing through the biological body can be received with high precision in the light-receiving part 12. In addition, in the detection device 3 of this embodiment, cost reduction can be achieved by omitting the bandpass filter in the second light-receiving region 61.

[0098] The light-receiving unit 12 receives the green light LG emitted from the first light-emitting unit 50 and propagating inside the measurement unit M in the first light-receiving region 51, and generates a detection signal corresponding to its light intensity. In addition, although a portion of the green light LG is incident on the second light-receiving region 61, the green light LG incident on the second light-receiving region 61 is cut off by the angle-limiting filter 121.

[0099] Furthermore, when the light-receiving unit 12 receives red light LR emitted from the second light-emitting unit 60 and propagating inside the measurement unit M, or near-infrared light LI emitted from the third light-emitting unit 70 and propagating inside the measurement unit M, in the second light-receiving region 61, it generates a detection signal corresponding to the intensity of the light received. Additionally, although a portion of the red light LR and near-infrared light LI are incident on the first light-receiving region 51, the red light LR and near-infrared light LI incident on the first light-receiving region 51 are blocked by the bandpass filter 122.

[0100] As described above, the detection device 3 of this embodiment includes: a first light-emitting unit 50 that emits green light LG; a second light-emitting unit 60 that emits red light LR having a wavelength longer than that of the green light LG; and a light-receiving unit 12 that receives the green light LG and the red light LR emitted from the first light-emitting unit 50 and the second light-emitting unit 60 and emitted from the measurement unit M, respectively. The light-receiving unit 12 includes: a first light-receiving area 51 that receives the green light LG; a second light-receiving area 61 that is disposed at a position farther from the first light-emitting unit 50 than the first light-receiving area 51 and receives the red light LR; and a bandpass filter 122 disposed in the first light-receiving area 51 that selectively allows the green light LG to pass through.

[0101] In this embodiment, the bandpass filter 122 is a bandpass filter that selectively allows green light LG to pass through. In addition, the detection device 3 of this embodiment also has a third light-emitting unit 70 that emits near-infrared light LI, and the first light-emitting unit 50, the second light-emitting unit 60 and the third light-emitting unit 70 emit light independently in a time sequence.

[0102] According to the detection device 3 of this embodiment, a single light-receiving unit 12 can receive green light LG, red light LR, and near-infrared light LI respectively. Therefore, compared with the conventional structure that uses two light-receiving units, the device structure can be miniaturized to, for example, about half the size. Thus, a compact detection device 3 that can obtain both pulse interval and oxygen saturation can be provided. In addition, by using only one light-receiving unit 12, the cost of the detection device 3 can be reduced.

[0103] In this embodiment, the light-receiving unit 12 receives each light in sync with the emission times of the green light LG, the red light LR, and the near-infrared light LI.

[0104] According to this structure, the signals of green light LG, red light LR, and near-infrared light LI can be acquired temporally separately. Therefore, it is possible to suppress the light from becoming noise. Thus, by using a single light-receiving unit 12, it is possible to achieve a structure that can miniaturize the device and detect both pulse interval and oxygen saturation.

[0105] (Second Implementation)

[0106] Next, the detection device of the second embodiment will be described. In the first embodiment, the case in which the bandpass filter 122 is provided in the first light-receiving region 51 is given as an example, but the detection device of this embodiment differs from the first embodiment in that the first filter is only provided in the second light-receiving region 61.

[0107] Figure 8 This is a cross-sectional view of the detection device in this embodiment. Figure 8 It is the same as the first embodiment. Figure 4 The corresponding structure. Furthermore, structures and components common to the first embodiment are labeled with the same reference numerals, and detailed descriptions are omitted.

[0108] like Figure 8 As shown, the detection device 103 of this embodiment includes a bandpass filter (first filter) 222 disposed in the second light-receiving region 61 of the light-receiving section 112. The bandpass filter 222 is disposed in the region corresponding to the second light-receiving region 61 in the light-receiving surface 120a of the light-receiving element 120. The bandpass filter 222 has the characteristic of selectively allowing red light LR and near-infrared light LI to pass through, while absorbing light of other wavelengths and cutting them off. The bandpass filter 222 is formed, for example, by alternately stacking multiple low-refractive-index layers such as silicon oxide and high-refractive-index layers such as titanium oxide on the angle-limiting filter 121. In addition, the bandpass filter 222 is formed in the region corresponding to the second light-receiving region 61 using a conventionally known photolithography process.

[0109] The second light-receiving region 61 of the light-receiving part 112 is located at the side plate part 40b of the housing 40, which is further away from the first light-receiving region 51. Therefore, the fourth stray light component SL4 can easily enter the second light-receiving region 61 from the gap between the organism and the detection surface 16.

[0110] According to the detection device 103 of this embodiment, by using the bandpass filter 222, which is composed of a bandpass filter provided in the second light-receiving region 61, it is possible to make it difficult for the fourth stray light component SL4 incident on the second light-receiving region 61 to reach the light-receiving surface 120a.

[0111] For example, when the size of the housing 40 is reduced by decreasing the distance between the side plate portion 40b and the second light-receiving area 61, it is easily affected by the fourth stray light component SL4. In the case of the detection device 103 of this embodiment, the influence of the fourth stray light component SL4 is suppressed by providing a bandpass filter 222 in the second light-receiving area 61. Therefore, the detection device 103 of this embodiment can achieve miniaturization of the device structure by suppressing the influence of noise components caused by the fourth stray light component SL4 and reducing the size of the housing 40.

[0112] (Third Implementation)

[0113] Next, the detection device of the third embodiment will be described. In the first embodiment, the case in which the bandpass filter 122 is provided in the first light-receiving region 51 is described, but the detection device of this embodiment differs from the first embodiment in that the bandpass filters are provided in both the first light-receiving region 51 and the second light-receiving region 61.

[0114] Figure 9 This is a cross-sectional view of the detection device in this embodiment. Figure 9 It is the same as the first embodiment. Figure 4 The corresponding structure. Furthermore, structures and components common to the first embodiment are labeled with the same reference numerals, and detailed descriptions are omitted.

[0115] like Figure 9 As shown, the detection device 203 of this embodiment includes a bandpass filter (first filter) 122 disposed in the first light-receiving region 51 of the light-receiving section 212, and a bandpass filter (second filter) 322 disposed in the second light-receiving region 61 of the light-receiving section 212. The bandpass filter 122 has the characteristic of selectively allowing green light LG to pass through while absorbing and blocking light of other wavelengths. The bandpass filter 322 has the characteristic of selectively allowing red light LR and near-infrared light LI to pass through while absorbing and blocking light of other wavelengths.

[0116] Bandpass filter 122 and bandpass filter 322 are formed in the light-receiving surface 120a of light-receiving element 120, respectively, corresponding to the first light-receiving region 51 and the second light-receiving region 61, using conventionally known photolithography processes.

[0117] According to the detection device 203 of this embodiment, since bandpass filters 122 and 322 are provided in the first light-receiving region 51 and the second light-receiving region 61 respectively, the influence of noise components in each light-receiving region 51 and 61 can be reduced. Therefore, a detection device that can detect both pulse interval and oxygen saturation with high accuracy while miniaturizing the device structure can be provided.

[0118] Figure 10 This is a cross-sectional view of the detection device in a modified embodiment of this invention.

[0119] like Figure 10 As shown, in the detection device 303 of this modified example, the width H2 of the bandpass filter 322 disposed in the second light-receiving region 61 along the X-axis (second direction) is greater than the width H1 of the bandpass filter 122 disposed in the first light-receiving region 51 along the X-axis. That is, in this modified example, unlike the above embodiment, the width of the second light-receiving region 61 is larger than the width of the first light-receiving region 51 along the X-axis. In addition, the light emission amount of each light-emitting part 50, 60, 70 can be adjusted according to the widths of the second light-receiving region 61 and the first light-receiving region 51.

[0120] As described above, green light LG attenuates more easily as it travels further within a living organism. Therefore, the area closer to the +X side of the first light-receiving region 51 (towards the second light-receiving region 61) receives less green light LG. In this modified example, by using the +X side of the first light-receiving region 51 as the second light-receiving region 61, the increase in the amount of red light LR and near-infrared light LI received by expanding the second light-receiving region 61 is greater than the decrease in the amount of green light LG received. Therefore, according to the structure of this modified example, the detection accuracy of red light LR and near-infrared light LI can be relatively improved without changing the size of the light-receiving portion 12.

[0121] The present invention has been described above based on the above embodiments, but the present invention is not limited to the above embodiments and can be implemented in various ways without departing from its spirit.

[0122] For example, in the above embodiments, a human being is exemplified as an organism, but the present invention can also be applied to the measurement of biological information (e.g., pulse) of other animals.

[0123] Furthermore, in the above-described embodiment of the measuring device 100, the case in which the detection device 3 is installed inside the housing portion 1 is given as an example, but the location of the detection device 3 is not limited to this, for example, it may also be embedded in the watch strap 2.

[0124] Furthermore, the measuring device 100 described in the above embodiment is exemplified by a watch-type structure, but the present invention can also be applied to, for example, a structure worn around the neck of the person being measured as a necklace, a structure pasted onto the body of the person being measured as a sticker, or a structure worn on the head of the person being measured as a head-mounted display.

[0125] Furthermore, in the above embodiment, the example given is that the angle limiting filter 121 is shared in both the first light-receiving region 51 and the second light-receiving region 61. However, angle limiting filters may also be provided in the first light-receiving region 51 and the second light-receiving region 61 respectively. In this case, the permissible incident angles in the first light-receiving region 51 and the second light-receiving region 61 may be different.

[0126] The detection device of one aspect of the present invention may also have the following structure.

[0127] One aspect of the detection device of the present invention includes: a first light-emitting unit that emits first light having a green wavelength; a second light-emitting unit that emits second light having a wavelength longer than the green wavelength; and a light-receiving unit that receives the first light emitted from the first light-emitting unit and the second light emitted from the second light-emitting unit and emitted from a living organism, respectively. The light-receiving unit includes: a first light-receiving area that receives the first light; a second light-receiving area that is disposed at a position further away from the first light-emitting unit than the first light-receiving area and receives the second light; and a first filter that is disposed in either the first light-receiving area or the second light-receiving area and selectively allows light of the corresponding wavelength to pass through.

[0128] In one aspect of the detection device of the present invention, the following structure may also be provided: a first filter is provided in the first light-receiving area, and the first filter is a bandpass filter that selectively allows the first light to pass through.

[0129] In one aspect of the detection device of the present invention, the following structure may also be provided: a first filter is provided in the second light-receiving area, the first filter being a bandpass filter that selectively allows the second light to pass through.

[0130] In one aspect of the detection device of the present invention, the following structure may also be provided: the detection device further comprises a third light-emitting part that emits a third light, the second light-emitting part emits light in one of the red band and the near-infrared band as the second light, the third light-emitting part emits light in the other of the red band and the near-infrared band as the third light, and the first light-emitting part, the second light-emitting part and the third light-emitting part emit light independently in chronological order.

[0131] In one aspect of the detection device of the present invention, the following structure may also be provided: the light receiving part receives each light in sync with the emission time of the first light, the second light and the third light.

[0132] In one aspect of the detection device of the present invention, the following structure may also be provided: the first light-emitting part and the second light-emitting part are arranged in a first direction, the first light-receiving area and the second light-receiving area are arranged in a second direction that intersects the first direction, and the first light-receiving area is closer to the first light-emitting part side in the second direction than the second light-receiving area.

[0133] In one embodiment of the detection device of the present invention, the following structure may also be provided: the light-receiving part further includes a second filter, which is disposed in either the first light-receiving area or the second light-receiving area, and selectively allows light of the corresponding wavelength band to pass through.

[0134] In one aspect of the detection device of the present invention, the following structure may also be provided: in the first filter and the second filter, the width of one filter disposed in the second light-receiving area in the second direction is larger than the width of the other filter disposed in the first light-receiving area in the second direction.

[0135] The measuring device of one aspect of the present invention may also have the following structure.

[0136] One aspect of the measuring device of the present invention includes: a detection device of the above-described manner; and an information analysis unit that determines biological information based on a detection signal representing the detection result of the detection device.

Claims

1. A detection device, wherein, The detection device has the following features: The first light-emitting part emits a first light with a green wavelength; A second light-emitting part, which is arranged in the first direction and aligned with the first light-emitting part, emits a second light having a wavelength longer than the green band; and The light-receiving part receives the first light emitted from the first light-emitting part and the second light emitted from the second light-emitting part, respectively, and is emitted from the organism. The light-receiving part has: The first light-receiving area receives the first light; The second light-receiving area is arranged in a second direction intersecting the first direction with the first light-receiving area, and is located in the second direction at a position further away from the first light-emitting part than the first light-receiving area, and receives the second light; The first filter is disposed in either the first light-receiving area or the second light-receiving area, and selectively allows light of the corresponding wavelength band to pass through. as well as An angle-limiting filter is disposed in the first and second light-receiving areas such that it covers the light-receiving surfaces of the first and second light-receiving areas, thereby limiting the incident angle of light incident on the light-receiving surfaces to a predetermined incident angle. In the light-receiving part, the width of the first light-receiving area in the second direction is smaller than the width of the second light-receiving area in the second direction.

2. The detection device according to claim 1, wherein, The first filter is provided in the first light-receiving area. The first filter is a bandpass filter that selectively allows the first light to pass through.

3. The detection device according to claim 1, wherein, The first filter is provided in the second light-receiving area. The first filter is a bandpass filter that selectively allows the second light to pass through.

4. The detection device according to any one of claims 1 to 3, wherein, The detection device also has a third light-emitting part that emits a third light. The second light-emitting part emits light from one of the red and near-infrared bands as the second light. The third light-emitting part emits light from another band in the red and near-infrared bands as the third light. The first light-emitting part, the second light-emitting part, and the third light-emitting part emit light independently in chronological order.

5. The detection device according to claim 4, wherein, The light-receiving part receives each light in sync with the emission times of the first light, the second light, and the third light.

6. The detection device according to any one of claims 1 to 3, wherein, The light-receiving part further includes a second filter, which is disposed in either the first light-receiving area or the second light-receiving area. The second filter is a bandpass filter that selectively allows light of a corresponding wavelength band to pass through.

7. The detection device according to claim 6, wherein, In the first filter and the second filter, the width of one filter disposed in the second light-receiving area in the second direction is larger than the width of the other filter disposed in the first light-receiving area in the second direction.

8. A measuring device, wherein, The measuring device has the following features: The detection device according to any one of claims 1 to 7; as well as The information analysis unit determines biological information based on the detection signal representing the detection result of the detection device.

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