Detection device and measuring device

Abstract

The present invention provides a detection device and a measurement device, which improve the detection accuracy. The detection device of the present invention includes: a light-emitting part that emits light; a light-receiving part that receives the light emitted from the light-emitting part and emitted from a living body; a holding member that holds the light-emitting part and the light-receiving part; a sealing member that seals the light-emitting part and the light-receiving part; a cover member that covers the holding member sealed by the sealing member; and a light-transmissive member that is interposed between the sealing member and the cover member. When the refractive indices of the sealing member, the light-transmissive member, and the cover member are set to n1, n2, and n3 respectively, the relationship n1 ≤ n2 ≤ n3 is satisfied.

Description

Technical Field

[0001] The present invention relates to a detection device and a measurement device. Background Art

[0002] Various measurement techniques for non-invasively measuring biological information such as pulse have been proposed in the past. For example, the following technique is disclosed in Patent Document 1: In a detection device having a light-emitting unit that emits light toward a living body and a light-receiving unit that receives light emitted from the light-emitting unit and incident after being reflected by the living body, the close contact between the cover covering the light-emitting unit and the light-receiving unit and the living body is improved.

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2001-353133

[0004] However, in the above detection device, there is a problem that light from the light-emitting unit reflected from the back surface of the cover member enters the light-receiving unit as stray light, resulting in a decrease in detection accuracy. Summary of the Invention

[0005] According to one aspect of the present invention, there is provided a detection device including: a light-emitting unit that emits light; a light-receiving unit that receives light emitted from the light-emitting unit and emitted from a living body; a holding member that holds the light-emitting unit and the light-receiving unit; a sealing member that seals the light-emitting unit and the light-receiving unit; a cover member that covers the holding member sealed by the sealing member; and a light-transmitting member that is interposed between the sealing member and the cover member. When the refractive indices of the sealing member, the light-transmitting member, and the cover member are set to n1, n2, and n3, respectively, the relationship n1 ≤ n2 ≤ n3 is satisfied.

[0006] According to one aspect of the present invention, there is provided a detection device including: a light-emitting unit that emits light toward a living body; a light-receiving unit that receives light from the living body; a holding member that holds the light-emitting unit and the light-receiving unit; a wall member for light shielding that is disposed in a portion of the holding member between the light-emitting unit and the light-receiving unit; a sealing member that seals the light-emitting unit and the light-receiving unit; a cover member that covers the holding member sealed by the sealing member; and a light-transmitting member that is interposed between the sealing member and the cover member. The wall member is formed to separate the sealing member into a storage space for the light-emitting unit and the light-receiving unit and reaches the light-transmitting member from the bottom surface of the holding member, and the value of the refractive index of the light-transmitting member is equal to or less than the value of the refractive index of the cover member.

[0007] According to one aspect of the present invention, there is provided a measurement device including: the detection device according to the above aspect; and an information analysis unit that determines biological information based on a detection signal indicating a detection result of the detection device. Description of the Drawings

[0008] Figure 1 FIG. 5 is a side view of the measuring device according to the first embodiment.

[0009] Figure 2 FIG. 6 is a structural diagram focusing on the functions of the measuring device.

[0010] Figure 3 FIG. 7 is a top view of the detection device.

[0011] Figure 4 FIG. 8 is a sectional view taken along the arrow of line IV-IV in Figure 3 FIG. 9 is a sectional view taken along the arrow of line IV-IV in

[0012] Figure 5 FIG. 10 is a diagram for explaining the operation of the detection device.

[0013] Figure 6 FIG. 11 is a graph showing the simulation results indicating the effectiveness of the detection device.

[0014] Figure 7 FIG. 12 is a graph showing the transmission spectrum of the skin.

[0015] Figure 8 FIG. 13 is a sectional view showing the structure of the detection device according to the second embodiment.

[0016] Figure 9 FIG. 14 is a sectional view showing the structure of the detection device according to the third embodiment.

[0017] Figure 10 FIG. 15 is a sectional view showing the structure of the detection device according to the fourth embodiment.

[0018] Description of Reference Numerals

[0019] 3, 3A, 3B, 3C: Detection device; 5: Control device (information analysis unit); 11: Light emitting unit (light emitting part); 12: Light receiving unit (light receiving part); 20, 120, 220: Cover member; 20a, 120a, 220a: Convex surface; 20c: Concave part; 30: Intermediate member (light transmissive member); 40: Housing (holding member); 40a: Bottom surface part; 40b, 41, 140b, 141: Wall part; 42: Sealing member; 50: First light emitting element; 51: First light receiving element; 60: Second light emitting element; 61: Second light receiving element; 70: Third light emitting element; 100: Measuring device; 120b, 220b: Concave surface; LG: Green light (first light); LR: Red light (second light); LI: Near-infrared light (third light); M: Measuring part (organism); S1, S2, S3: Detection signal. Detailed Description of the Invention

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In addition, in the following drawings, in order to make each component recognizable in size, the scale and angle of each component are different from the actual ones.

[0021] (First Embodiment)

[0022] Figure 1 is a side view of the measuring device 100 of the first embodiment. Figure 1 The measuring device 100 of the present embodiment shown is a biological measurement device that non-invasively measures biological information of a subject (e.g., a person) as an example of a living body, and is worn on a part (hereinafter referred to as "measurement part") M of the subject's body that becomes the measurement object. The measuring device 100 of the present embodiment is a watch-type portable device having a main body part 1 and a strap 2, and the measuring device 100 can be worn on the subject's wrist by winding the belt-like strap 2 around the wrist as an example of the measurement part (living body) M. In the present embodiment, the subject's pulse (e.g., pulse rate) and oxygen saturation (SpO2) are exemplified as biological information. Pulse refers to the time change of the volume in the blood vessel linked to the pulsation of the heart. Oxygen saturation refers to the ratio (%) of hemoglobin bound to oxygen in the hemoglobin in the subject's blood, and is an index for evaluating the subject's respiratory function.

[0023] Figure 2 is a structural diagram focusing on the functions of the measuring device 100. As Figure 2 shown, the measuring device 100 of the present embodiment has 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 provided inside the main body part 1. As Figure 1 shown, the display device 4 is provided on the surface of the main body part 1 on the side opposite to the measurement 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.

[0024] The detection device 3 is an optical sensor module that generates a detection signal S corresponding to the state of the measurement part M. As Figure 1 shown, the detection device 3 is provided, for example, on the opposed surface (hereinafter referred to as the detection surface) 16 of the main body part 1 that faces the measurement part M. The detection surface 16 is the surface that contacts the measurement part M. As Figure 2 shown, the detection device 3 of the present embodiment has a light emitting unit part (light emitting part) 11, a light receiving unit part (light receiving part) 12, a drive circuit 13, and an output circuit 14. In addition, one or both of the drive circuit 13 and the output circuit 14 can be provided as an external circuit of the detection device 3. That is, the drive circuit 13 and the output circuit 14 can be omitted from the detection device 3.

[0025] The light-emitting unit section 11 includes a first light-emitting element 50, a second light-emitting element 60, and a third light-emitting element 70. The first light-emitting element 50, the second light-emitting element 60, and the third light-emitting element 70 are elements that emit light of different wavelengths to the measurement site M respectively.

[0026] The first light-emitting element 50 emits green light (first light) LG in the green wavelength band of 520 nm to 550 nm toward the measurement site M. The green light LG in the present embodiment is, for example, light with a peak wavelength of 520 nm.

[0027] The second light-emitting element 60 emits red light (second light) LR in the red wavelength band of 600 nm to 800 nm toward the measurement site M, for example. The red light LR in the present embodiment is, for example, light with a peak wavelength of 660 nm.

[0028] The third light-emitting element 70 emits near-infrared light (third light) LI in the near-infrared wavelength band of 800 nm to 1300 nm toward the measurement site M, for example. The near-infrared light LI in the present embodiment is, for example, light with a peak wavelength of 905 nm.

[0029] As the light-emitting elements constituting the first light-emitting element 50, the second light-emitting element 60, and the third light-emitting element 70, for example, a bare chip type or a bullet type LED (Light Emitting Diode) is preferably used. In addition, the wavelengths of the light emitted from each light-emitting section are not limited to the above numerical ranges. Hereinafter, without particularly distinguishing the first light-emitting element 50, the second light-emitting element 60, and the third light-emitting element 70, they are collectively referred to as the respective light-emitting elements 50, 60, and 70.

[0030] The drive circuit 13 causes the respective light-emitting elements 50, 60, and 70 to emit light by supplying a drive current. The drive circuit 13 in the present embodiment causes the respective light-emitting elements 50, 60, and 70 to emit light periodically at different times. The light emitted from the respective light-emitting elements 50, 60, and 70 is incident on the measurement site M, and after propagating while repeatedly reflecting and scattering inside the measurement site M, it is emitted to the main body section 1 side and reaches the light-receiving unit section 12. That is, the detection device 3 in the present embodiment is a reflection type optical sensor in which the light-emitting unit section 11 and the light-receiving unit section 12 are located on one side with respect to the measurement site M.

[0031] The light receiving unit 12 receives the light that arrives from the measurement site M through the light emission of the light emitting unit 11. The light receiving unit 12 of the present embodiment includes a first light receiving element 51 and a second light receiving element 61. The first light receiving element 51 and the second light receiving element 61 generate detection signals corresponding to the intensity of the received light. Hereinafter, without particularly distinguishing between the first light receiving element 51 and the second light receiving element 61, they are collectively referred to as "each light receiving element 51, 61".

[0032] The first light receiving element 51 receives the green light LG that is emitted from the light emitting element 50 and propagates inside the measurement site M, and generates a detection signal corresponding to its light receiving intensity. The second light receiving element 61 receives the red light LR that is emitted from the second light emitting element 60 and propagates inside the measurement site M, or the near infrared light LI that is emitted from the third light emitting element 70 and propagates inside the measurement site M, and generates a detection signal corresponding to its light receiving intensity.

[0033] The output circuit 14 is configured to include, for example: an A / D converter that converts the detection signals generated by each of the light receiving elements 51, 61 from analog to digital; and an amplifier circuit that amplifies the converted detection signals (both are omitted from the illustration). The output circuit 14 generates a plurality of detection signals S (S1, S2, S3) corresponding to different wavelengths.

[0034] The detection signal S1 is a signal indicating the light receiving intensity of the first light receiving element 51 when receiving the green light LG emitted from the light emitting element 50. The detection signal S2 is a signal indicating the light receiving intensity of the second light receiving element 61 when receiving the red light LR emitted from the second light emitting element 60, and the detection signal S3 is a signal indicating the light receiving intensity of the second light receiving element 61 when receiving the near infrared light LI emitted from the third light emitting element 70.

[0035] Normally, during the dilation and contraction of blood vessels, the light absorption amount of blood is different. Therefore, each detection signal S becomes a pulse signal including a periodic variation component corresponding to the pulsation component (volume pulse) of the artery inside the measurement site M.

[0036] In addition, the drive circuit 13 and the output circuit 14 are mounted on the wiring board together with the light emitting unit 11 and the light receiving unit 12 in the form of an IC chip. In addition, as described above, the drive circuit 13 and the output circuit 14 can also be provided outside the detection device 3.

[0037] The control device 5 is an arithmetic processing device such as a CPU (Central Processing Unit) or an FPGA (Field-Programmable Gate Array), and controls the entirety of the measuring device 100. The storage device 6 is constituted by, for example, a non-volatile semiconductor memory, and stores programs executed by the control device 5 and various data used by the control device 5. Further, a structure in which the functions of the control device 5 are distributed to a plurality of integrated circuits, or a structure in which a part or all of the functions of the control device 5 are realized by a dedicated electronic circuit may be adopted. In addition, Figure 2 in, the control device 5 and the storage device 6 are illustrated as separate elements, but the control device 5 incorporating the storage device 6 can also be realized by, for example, an ASIC (Application-Specific Integrated Circuit).

[0038] The control device 5 of the present embodiment determines the biological information of the subject to be measured based on a plurality of detection signals S (S1, S2, S3) generated by the detection device 3 by executing the program stored in the storage device 6. Specifically, the control device 5 can determine the pulse interval (PPI) of the subject to be measured based on the detection signal S1 indicating the light reception intensity of the first light receiving element 51 with respect to the green light LG. In addition, the control device 5 can determine the oxygen saturation (SpO2) of the subject to be measured by analyzing the detection signal S2 indicating the light reception intensity of the second light receiving element 61 with respect to the red light LR and the detection signal S3 indicating the light reception intensity of the second light receiving element 61 with respect to the near-infrared light LI.

[0039] As described above, in the measuring device 100 of the present embodiment, the control device 5 functions as an information analysis unit, and determines the biological information based on the detection signal S indicating the detection result of the detection device 3. The control device (information analysis unit) 5 causes the display device 4 to display the biological information determined based on the detection signal S. In addition, the measurement result can also be notified to the user by voice output. A structure that preferably notifies the user of a warning (possibility of physical dysfunction) when the pulse rate or oxygen saturation changes to a value outside a specified range is also preferable.

[0040] Figure 3 is a top view of the detection device 3 of the present embodiment. Figure 4 is based on Figure 3 in the cross-sectional view taken along the arrow of line IV-IV. As Figure 3 and Figure 4 shown, the detection device 3 of the present embodiment includes, in addition to the light emitting unit portion 11 and the light receiving unit portion 12, a cover member 20, an intermediate member (light transmissive member) 30, a housing 40, and a sealing member 42. In addition, inFigure 3 and Figure 4 In Figure 4 , illustrations of the drive circuit 13 and the output circuit 14 are omitted.

[0041] Hereinafter, the structure of the detection device 3 will be described using an XYZ coordinate system. The X-axis corresponds to an axis along the long side (one side) of the housing 40 having a rectangular outer shape, the Y-axis corresponds to an axis perpendicular to the X-axis and along the short side (the other side) of the housing 40, and the Z-axis corresponds to an axis perpendicular to the X-axis and the Y-axis respectively and along the thickness direction of the housing 40.

[0042] As Figure 3 and Figure 4 shown, the housing 40 is a component that holds the respective elements (the light emitting unit portion 11 and the light receiving unit portion 12) constituting the detection device 3. The housing 40 has a box shape including a rectangular flat bottom surface portion 40a, a rectangular frame-shaped wall portion 40b protruding from the periphery of the bottom surface portion 40a toward the +Z side, and a light shielding wall portion 41. The housing 40 is formed of, for example, aluminum. The inner peripheral surface 40b1 of the wall portion 40b has light shielding properties by being colored black. Thereby, reflection at the inner peripheral surface 40b1 of the wall portion 40b is suppressed.

[0043] In addition, the material and manufacturing method of the housing 40 are arbitrary. For example, the housing 40 can also be formed by injection molding of a resin material. In addition, a structure in which the housing 40 is integrally formed with the main body portion 1 is also preferable.

[0044] The light emitting unit portion 11 and the light receiving unit portion 12 are provided on the bottom surface portion 40a of the housing 40 in a state of being mounted on a wiring board (illustrations omitted).

[0045] The light shielding wall portion 41 is disposed between the light emitting unit portion 11 and the light receiving unit portion 12 in the direction along the X-axis. The light shielding wall portion 41 is a plate-shaped member protruding from the bottom surface portion 40a toward the +Z side and extending in the Y-axis direction, and separates the accommodation space inside the housing 40 into two in the X-axis direction. That is, the light shielding wall portion 41 separates the space for accommodating the light emitting unit portion 11 and the light receiving unit portion 12 in the direction along the X-axis. The light shielding wall portion 41 is a wall for shielding light so that the light emitted from the light emitting unit portion 11 does not directly enter the light receiving unit portion 12. The light shielding wall portion 41 can also be said to be a member that shields a part of the green light LG, the red light LR, and the near-infrared light LI. In Figure 4 the example of Figure 4 , the light shielding wall portion 41 is formed to separate the sealing member 42 into the accommodation spaces of the light emitting unit 11 and the light receiving unit 12 and reach the intermediate member 30 from the bottom surface portion 40a of the housing 40. In the case of the present embodiment, as will be described later, the refractive index value of the intermediate member 30 is equal to or less than the refractive index value of the cover member 20.

[0046] The sealing member 42 is a transparent material that seals (molds) the light-emitting unit portion 11 and the light-receiving unit portion 12. As the material of the sealing member 42, for example, a UV-curable or ultraviolet-curable optical adhesive having light-transmitting properties is used. The refractive index of these optical adhesives is, for example, about 1.3 to 1.5.

[0047] The sealing member 42 is filled in the gap between the light-emitting unit portion 11 and the light-receiving unit portion 12 housed in the housing 40 and the wall portion 40b. In the present embodiment, the sealing member 42 seals each light-emitting element 50, 60, 70 and each light-receiving element 51, 61. In the present embodiment, the upper surface of the sealing member 42 is flush with the upper surfaces of the wall portions 40b, 41 of the housing 40.

[0048] The cover member 20 covers the housing 40 sealed by the sealing member 42. The cover member 20 is formed of a light-transmitting member, for example. As the material of the cover member 20, for example, acrylic (refractive index: 1.49), polycarbonate (refractive index: 1.585) is used.

[0049] In the present embodiment, the cover member 20 includes a convex surface 20a. The convex surface 20a is a curved surface that protrudes toward the measurement site M and functions as the detection surface 16. In the cover member 20, the surface 20b on the side opposite to the convex surface 20a is formed of a flat surface. The cover member 20 of the present embodiment is a plano-convex cover in which one surface is formed of a curved surface and the other surface is formed of a flat surface. According to the cover member 20 of the present embodiment, since the detection surface 16 is formed of the convex surface 20a, the detection surface 16 can be brought into good contact with the measurement site M. Thereby, it is possible to suppress the intrusion of stray light components from the gap between the detection surface 16 and the measurement site M.

[0050] The intermediate member 30 is a light-transmitting member interposed between the sealing member 42 and the cover member 20. As the material of the intermediate member 30, similar to the sealing member 42, for example, an optical adhesive having a refractive index of about 1.3 to 1.5 is used. In the present embodiment, the intermediate member 30 functions as a bonding material for bonding the cover member 20 to the sealing member 42 and the housing 40.

[0051] The sealing member 42 and the intermediate member 30 are appropriately selected for their respective constituent materials so as to satisfy the condition that the refractive index n1 of the sealing member 42 is less than the refractive index n2 of the intermediate member 30.

[0052] In addition, the intermediate member 30 and the cover member 20 are appropriately selected for their respective constituent materials so as to satisfy the condition that the refractive index n2 of the intermediate member 30 is smaller than the refractive index n3 of the cover member 20.

[0053] In the present embodiment, the refractive indices of the sealing member 42, the intermediate member 30, and the cover member 20 satisfy the relationship n1 < n2 < n3.

[0054] In addition, it is preferable that the refractive index difference between the refractive index n1 of the sealing member 42 and the refractive index n2 of the intermediate member 30 is as small as possible. In addition, it is preferable that the refractive index difference between the refractive index n2 of the intermediate member 30 and the refractive index n3 of the cover member 20 is as small as possible.

[0055] The light emitting unit portion 11 is disposed in the housing 40 such that the light emitting surfaces of the respective light emitting elements 50, 60, and 70 are parallel to the XY plane. That is, the respective light emitting elements 50, 60, and 70 emit light toward the +Z side.

[0056] The light receiving unit portion 12 is disposed in the housing 40 such that the light receiving surfaces of the respective light receiving elements 51 and 61 are parallel to the XY plane. That is, the respective light receiving elements 51 and 61 receive light incident from the Z direction.

[0057] As Figure 3 shown, the respective light emitting elements 50, 60, and 70 are arranged and disposed at intervals in the direction along the Y axis (first direction). Specifically, the second light emitting element 60 is disposed on the +Y side of the first light emitting element 50, and the third light emitting element 70 is disposed on the -Y side of the first light emitting element 50. That is, the first light emitting element 50 is disposed between the second light emitting element 60 and the third light emitting element 70 in the direction along the Y axis. In addition, it can also be said that the first light emitting element 50 is located between the second light emitting element 60 and the third light emitting element 70.

[0058] The respective light receiving elements 51 and 61 are arranged and disposed at intervals in the direction along the X axis (second direction) that intersects (is perpendicular to) the Y axis. Specifically, the first light receiving element 51 is disposed on the +X side of the light emitting unit portion 11, and the second light receiving element 61 is disposed on the +X side of the first light receiving element 51. That is, the second light receiving element 61 is disposed on the side opposite to the light emitting unit portion 11 with respect to the first light receiving element 51.

[0059] Here, the distance from the first light emitting element 50 to the first light receiving element 51 is set as D1, the distance from the second light emitting element 60 to the second light receiving element 61 is set as D2, and the distance from the third light emitting element 70 to the second light receiving element 61 is set as D3. The distance D1 corresponds to the distance between the respective central portions when the first light emitting element 50 and the first light receiving element 51 are viewed from the Z-axis direction. In addition, the distance D2 corresponds to the distance between the respective central portions when the second light emitting element 60 and the second light receiving element 61 are viewed from the Z-axis direction. In addition, the distance D3 corresponds to the distance between the respective central portions when the third light emitting element 70 and the second light receiving element 61 are viewed from the Z-axis direction.

[0060] In the detection device 3 of the present embodiment, the distance D1 from the first light-emitting element 50 to the first light-receiving element 51 is shorter than the distance D2 from the second light-emitting element 60 to the second light-receiving element 61. In addition, the distance D1 from the first light-emitting element 50 to the first light-receiving element 51 is shorter than the distance D3 from the third light-emitting element 70 to the second light-receiving element 61. In addition, the distance D2 is equal to the distance D3.

[0061] Thus, in the detection device 3 of the present embodiment, a structure is adopted in which the first light-receiving element 51 for receiving the green light LG is arranged at the position closest to the first light-emitting element 50 that emits the green light LG. That is, the first light-receiving element 51 is provided at a position closer to the light-emitting unit portion 11 than the second light-receiving element 61.

[0062] As Figure 4 shown, the first light-receiving element 51 includes a sensor 511 and a band-pass filter 512. The sensor 511 is constituted by, for example, a photodiode (PD: Photo Diode).

[0063] The band-pass filter 512 has the following characteristics: selectively transmits the wavelength band of the green light LG, and absorbs and cuts off light in other wavelength bands, that is, the red light LR and the near-infrared light LI. The band-pass filter 512 is formed, for example, by alternately laminating a plurality of low-refractive-index layers such as silicon oxide and high-refractive-index layers such as titanium oxide on the sensor 511.

[0064] In addition, an angle-limiting filter for limiting the incident angle of light incident on the sensor 511 may be provided between the sensor 511 and the band-pass filter 512.

[0065] In addition, the second light-receiving element 61 includes a sensor 611 that receives the red light LR or the near-infrared light LI. The sensor 611 is constituted by, for example, a photodiode. The second light-receiving element 61 has a different structure from the first light-receiving element 51 in that it does not include a band-pass filter that selectively transmits the red light LR or the near-infrared light LI. In addition, an angle-limiting filter for limiting the incident angle of light incident on the sensor 611 may be provided on the sensor 611.

[0066] Here, a part of the red light LR and the near-infrared light LI emitted from the second light-emitting element 60 may enter the first light-receiving element 51 through the living body. In the case of the present embodiment, the first light-receiving element 51 includes a band-pass filter 512 that selectively transmits the green light LG. Therefore, the first light-receiving element 51 can cut off the red light LR and the near-infrared light LI having wavelength bands different from the green light LG. Therefore, the first light-receiving element 51 can efficiently receive the green light LG emitted from the light-emitting element 50.

[0067] Hereinafter, the operation of the detection device 3 of the present embodiment will be described. Figure 5 This is a diagram for explaining the operation of the detection device 3.

[0068] For example, the green light LG emitted from the first light-emitting element 50 is incident on the cover member 20 through the sealing member 42 and the intermediate member 30 in sequence.

[0069] In the detection device 3 of the present embodiment, an intermediate member 30 having a refractive index n2 between the sealing member 42 and the cover member 20 is provided between the sealing member 42 and the intermediate member 30. That is, in the detection device 3 of the present embodiment, a structure is formed in which there is no air layer in the optical path from the light emitted from the light-emitting unit 11 until it exits from the cover member 20.

[0070] Here, as a comparative example, a detection device having a structure in which the intermediate member 30 is replaced with an air layer is considered. That is, the detection device of the comparative example has a structure in which an air layer is interposed in the optical path from the light emitted from the light-emitting unit 11 until it exits from the cover member 20.

[0071] In the detection device of the comparative example, a part of the green light LG emitted from the light-emitting unit 11 is reflected by Fresnel reflection when it is incident on the air layer from the sealing member 42.

[0072] In particular, in the case of the detection device of the comparative example, since the green light LG is incident from the high-refractive-index sealing member 42 on the low-refractive-index air layer, the component incident on the air layer at an incident angle larger than a specified angle is totally reflected. In addition, regarding the red light LR or the near-infrared light LI emitted from the light-emitting unit 11, the component incident on the air layer at an incident angle larger than a specified angle is also totally reflected in the same manner as the green light LG.

[0073] In this way, the light that is Fresnel-reflected or totally reflected at the interface between the sealing member 42 and the air layer may be directly incident on the first light-receiving element 51 without passing through the inside of the measurement site M, that is, the living body. Hereinafter, the light that does not pass through the living body and is directed toward the light-receiving element is referred to as a "stray light component".

[0074] In this way, in the detection device of the comparative example, total reflection occurs in addition to Fresnel reflection at the interface between the sealing member 42 and the air layer, so that the amount of stray light components directed toward the first light-receiving element 51 and the second light-receiving element 61 increases.

[0075] On the other hand, in the case of the detection device 3 of the present embodiment, when the green light LG emitted from the light-emitting unit 11 is incident on the intermediate member 30 from the sealing member 42, since it is incident from the low-refractive-index sealing member 42 on the high-refractive-index intermediate member 30, total reflection does not occur.

[0076] In addition, when the green light LG emitted from the light-emitting unit 11 is incident on the cover member 20 from the intermediate member 30, it is incident from the low-refractive-index intermediate member 30 to the high-refractive-index cover member 20, so total internal reflection does not occur. That is, the green light LG can be efficiently incident on the measurement site M via the cover member 20 in a state where total internal reflection is suppressed.

[0077] In addition, the red light LR or the near-infrared light LI emitted from the light-emitting unit 11 can be efficiently incident on the measurement site M via the cover member 20 in a state where total internal reflection is suppressed, similarly to the green light LG.

[0078] The inventor of the present invention verified the effectiveness of the detection device 3 of the present embodiment through simulation. Figure 6 It is a graph showing the results of this simulation. In addition, in this simulation, for the model corresponding to the detection device 3 and the model of the detection device corresponding to the comparative example in which the intermediate member 30 is replaced with an air layer, for example, the ratio of the received light amount of the stray light component in the first light-receiving element 51 when the green light emits light with the same power was obtained.

[0079] As Figure 6 shown, when the received light amount of the stray light component in the detection device of the comparative example is set to 1.0, the ratio of the received light amount of the stray light component in the detection device 3 of the present embodiment becomes 0.03 (3.0%).

[0080] That is, in the detection device of the comparative example, it can be confirmed that due to the air layer present between the intermediate member 30 and the cover member 20, total internal reflection occurs, and thus the amount of stray light component incident on the first light-receiving element 51 increases. In contrast, in the detection device 3 of the present embodiment, it can be confirmed that by providing the intermediate member 30, the stray light component caused by total internal reflection is eliminated, and thus the received light amount of the stray light component in the first light-receiving element 51 can be significantly reduced.

[0081] In addition, the inventor of the present invention also performed the same simulation for the case where the wavelength of the emitted light is other than green (red light, infrared light). As a result, it was confirmed that regardless of the wavelength band of the emitted light, the light-receiving efficiency of the light-receiving element can be improved by suppressing total internal reflection at the interface between the sealing member 42 and the cover member 20.

[0082] Thus, according to the detection device 3 of the present embodiment, since the sealing member 42, the intermediate member 30, and the cover member 20 have refractive indices satisfying the relationship of n1 < n2 < n3, total internal reflection of light at the interface between the sealing member 42 and the cover member 20 can be suppressed. As a result, the light emitted from the light-emitting unit 11 can be efficiently incident on the living body, and the light that has passed through the living body can be efficiently incident on the light-receiving unit 12.

[0083] In addition, in the detection device 3 of the present embodiment, by suppressing total reflection, the stray light component incident on the first light receiving element 51 and the second light receiving element 61 can be reduced. Thereby, the detection device 3 of the present embodiment can obtain a high S / N ratio by suppressing the incidence of the stray light component that becomes noise.

[0084] In addition, in the detection device 3 of the present embodiment, as Figure 4 shown, by providing the convex surface 20a on the cover member 20, the gap between the measurement part M and the cover member 20 can be reduced. Thereby, the case where external light incident from the gap between the measurement part M and the cover member 20 enters the light receiving unit part 12 as a stray light component can be suppressed.

[0085] In the detection device 3 of the present embodiment, the first light receiving element 51 is arranged at the position closest to the first light emitting element 50 that emits the green light LG.

[0086] Figure 7 is a graph showing the transmission spectrum of the skin. Figure 7 In [it], the horizontal axis represents the wavelength of light, and the vertical axis represents the transmittance (unit: %). Figure 7 As an example, the transmission spectrum in the case where the skin thickness is 0.43 mm is shown.

[0087] As Figure 7 shown, when the green light LG in the wavelength band (for example, 520 nm) is incident on the skin, the transmittance is about 30%, when the red light LR in the wavelength band (for example, 660 nm) is incident on the skin, the transmittance is about 45%, and when the near-infrared light LI in the wavelength band (for example, 905 nm) is incident on the skin, the transmittance is about 60%.

[0088] Figure 7 The figure shown shows that the distance that can propagate in the living body is different for each wavelength of light. That is, according to Figure 7 the graph, the green light LG can only propagate a shorter distance in the living body compared to the red light LR or the near-infrared light LI. That is, in other words, the red light LR and the near-infrared light LI can propagate farther in the living body compared to the green light LG. In addition, in Figure 7 the case where the skin thickness is 0.43 mm is cited as an example, but when the skin thickness is different, it can also be said that the red light LR and the near-infrared light LI can propagate farther in the living body compared to the green light LG.

[0089] Thus, in the detection device 3 of the present embodiment, by disposing the first light receiving element 51 and the first light emitting element 50 close to each other, the green light LG emitted from the first light emitting element 50 travels a shorter distance in the living body and enters the first light receiving element 51. As Figure 7 shown in the graph of

[0090] , the green light LG can only travel a short distance in the living body. Therefore, if the distance between the first light emitting element 50 that emits the green light LG and the first light receiving element 51 that receives the green light LG is short, the green light LG from the living body can enter the first light receiving element 51 with a higher intensity. Therefore, even when the emission amount of the green light LG in the first light emitting element 50 is suppressed, the detection device 3 of the present embodiment can sufficiently detect the green light LG that has propagated in the living body in the first light receiving element 51.

[0091] In addition, in the detection device 3 of the present embodiment, the distance (distance D2 or distance D3) between the second light emitting element 60 or the third light emitting element 70 and the second light receiving element 61 is larger than the distance D1 between the first light emitting element 50 and the first light receiving element 51. That is, the distance that the red light LR and the near-infrared light LI travel in the living body before entering the second light receiving element 61 is larger than the distance that the green light LG travels in the living body before entering the first light receiving element 51.

[0092] As Figure 7 shown, the green light LG can only travel a shorter distance in the living body than the red light LR or the near-infrared light LI. Therefore, assuming that the green light LG travels in the living body in such a way that it can reach the second light receiving element 61, the green light LG is in a sufficiently attenuated state when passing through the living body. Therefore, the green light LG cannot enter the second light receiving element 61.

[0093] On the other hand, the red light LR and the near-infrared light LI can travel farther in the living body than the green light LG. Therefore, even when the red light LR and the near-infrared light LI travel a longer distance in the living body than the green light LG, they can enter the second light receiving element 61, which is farther from the light emitting unit 11, with a sufficient amount of light.

[0094] In the case of the present embodiment, since only the red light LR and the near-infrared light LI are incident on the second light-receiving element 61, it is not necessary to provide a band-pass filter for selectively transmitting the red light LR and the near-infrared light LI and blocking the green light LG in the second light-receiving element 61. That is, in the detection device 3 of the present embodiment, the above-described structure in which only the first light-receiving element 51 includes the band-pass filter 512 and the second light-receiving element 61 does not include the band-pass filter can be adopted. Therefore, the detection device 3 of the present embodiment can reduce costs by omitting the band-pass filter of the second light-receiving element 61.

[0095] As described above, according to the detection device 3 of the present embodiment, by eliminating the stray light component caused by total reflection, the S / N ratio of the light-receiving unit portion 12 is improved, and thus high detection accuracy can be achieved. Therefore, since the light-receiving unit portion 12 can sufficiently receive light even with a small amount of light by improving the detection accuracy, the power consumption of the light-emitting unit portion 11 can be suppressed by suppressing the light emission amounts of the respective light-emitting elements 50, 60, and 70.

[0096] Therefore, according to the measuring device 100 of the present embodiment, since it has the above-described detection device 3, a biological measurement device that can suppress power consumption and perform high-precision detection can be provided.

[0097] (Second Embodiment)

[0098] Next, the detection device of the second embodiment will be described. The structure of the cover member of the detection device of the present embodiment is different from that of the first embodiment. Hereinafter, the same reference numerals will be given to the structures and components common to the first embodiment, and the detailed reference numerals will be omitted.

[0099] Figure 8 It is a cross-sectional view showing the structure of the detection device of the present embodiment. Figure 8 It is the same as that of the first embodiment Figure 4 corresponding figure.

[0100] As Figure 8 shown, the detection device 3A of the present embodiment includes a light-emitting unit portion 11, a light-receiving unit portion 12, a cover member 120, an intermediate member 30, a housing 40, and a sealing member 42.

[0101] The cover member 120 of the present embodiment has a dome shape including a convex surface 120a and a concave surface 120b provided on the opposite side of the convex surface 120a and recessed toward the convex surface 120a side. At least a part of the intermediate member 30 is disposed in the concave surface 120b. In the case of the present embodiment, the entire intermediate member 30 is disposed in the concave surface 120b. That is, the intermediate member 30 fills the concave surface 120b of the cover member 120 without a gap. The cover member 120 is joined to the sealing member 42 and the housing 40 via the intermediate member 30 disposed in the concave surface 120b. In addition, the intermediate member 30 may be disposed in a state of being exposed from the concave surface 120b of the cover member 120.

[0102] The detection device 3A of the present embodiment can be assembled, for example, by filling a liquid optical adhesive (the intermediate member 30 before curing) in the concave surface 120b of the cover member 120 and then covering the housing 40 sealed by the sealing member 42 from the upper side of the cover member 120 to cure the optical adhesive. That is, the cover member 120 can be used as a container for storing the optical adhesive during the assembly of the detection device 3A.

[0103] In the present embodiment, the refractive indices of the sealing member 42, the intermediate member 30, and the cover member 120 also satisfy the relationship of n1 < n2 < n3. That is, in the present embodiment, there is also a structure in which the intermediate member 30 having a refractive index between the sealing member 42 and the cover member 120 is interposed between the sealing member 42 and the cover member 120 on the optical path along which the light emitted from the light emitting unit portion 11 travels.

[0104] According to the detection device 3A of the present embodiment, similarly to the above-described embodiment, by eliminating the stray light component caused by total reflection, a high S / N ratio is obtained in the light receiving unit portion 12, and thus the green light LG, red light LR, or near-infrared light LI passing through the living body can be detected with higher accuracy. Therefore, power consumption can be reduced.

[0105] (Third Embodiment)

[0106] Next, the detection device of the third embodiment will be described. The structure of the cover member of the detection device of the present embodiment is different from that of the first embodiment. Hereinafter, the same reference numerals are given to the structures and components common to the first embodiment, and the detailed reference numerals are omitted.

[0107] Figure 9 It is a cross-sectional view showing the structure of the detection device of the present embodiment. Figure 9 It is the same as that of the first embodiment Figure 4 corresponding figure.

[0108] As Figure 9As shown, the detection device 3B of the present embodiment includes a light-emitting unit section 11, a light-receiving unit section 12, a cover member 20, an intermediate member 30, a housing 140, and a sealing member 42.

[0109] The housing 140 of the present embodiment has a box shape including a rectangular flat bottom surface portion 40a, a rectangular frame-shaped wall portion 140b protruding from the periphery of the bottom surface portion 40a toward the +Z side, and a light-shielding wall portion 141.

[0110] In the present embodiment, the housing 140 includes a recess 20c into which at least one of the plurality of wall portions 140b and 141 is inserted. In the case of the present embodiment, the light-shielding wall portion 141 protrudes upward (+Z side) more than the wall portion 140b. In addition, the wall portion 141 also protrudes upward (+Z side) from the upper surface 42a of the sealing member 42.

[0111] The cover member 20 of the present embodiment is provided with a recess 20c on the surface 20b opposite to the convex surface 20a for avoiding contact with the wall portion 141 of the housing 140. The light-shielding wall portion 141 is inserted into the recess 20c of the cover member 20. The intermediate member 30 is disposed between the wall portion 141 inserted into the recess 20c and the recess 20c.

[0112] Here, it is necessary to accurately align the cover member 20 with the housing 140 that houses the light-emitting unit section 11 and the light-receiving unit section 12. In the case where the wall portion 141 is fitted into the recess 20c, for example, even if the tolerances of the cover member 20 and the housing 140 are strictly managed and the components are manufactured with high precision, it is easy to generate a gap between the wall portion 141 and the recess 20c.

[0113] In contrast, in the detection device 3B of the present embodiment, the size of the recess 20c is designed to be sufficiently larger than the wall portion 141, and the gap generated between the recess 20c and the wall portion 141 is filled with the intermediate member 30. According to the detection device 3B of the present embodiment, after applying a transparent adhesive material or transparent resin to the surface of the sealing member 42, in a state where the wall portion 141 of the housing 140 is inserted into the recess 20c of the cover member 20, by curing the adhesive material or transparent resin, a structure in which the gap between the recess 20c and the wall portion 141 is filled with the intermediate member 30 can be assembled. Figure 9 Therefore, according to the detection device 3B of the present embodiment, even in the case of using the housing 140 having a structure in which the wall portion 141 protrudes from the other wall portions 140b, it is not necessary to strictly manage the tolerances of the components, the manufacturing becomes easy, and thus cost reduction can be achieved.

[0114] The detection device 3B according to the present embodiment, similar to the above-described embodiment, obtains a high S / N ratio in the light receiving unit portion 12 by eliminating the stray light component caused by total reflection, and thus can detect the green light LG, red light LR, or near-infrared light LI passing through the living body with higher accuracy. In addition, in the detection device 3B of the present embodiment, by raising the light-shielding wall portion 141, it is possible to make it difficult for light to directly enter the light receiving unit portion 12 side from the light emitting unit portion 11. As a result, it is easier to suppress the incidence of stray light components into the light receiving unit portion 12, and therefore the detection accuracy of the light receiving unit portion 12 can be further improved. Therefore, further power consumption reduction can be achieved.

[0115] (Fourth Embodiment)

[0116] Next, the detection device of the fourth embodiment will be described. The structure of the cover member of the detection device of the present embodiment is different from that of the first embodiment. Hereinafter, the same reference numerals are given to the structures and components common to the first embodiment, and the detailed reference numerals are omitted.

[0117] Figure 10 It is a cross-sectional view showing the structure of the detection device of the present embodiment. Figure 10 is the same as that of the first embodiment Figure 4 corresponding figure.

[0118] As Figure 10 shown, the detection device 3C of the present embodiment includes a light emitting unit portion 11, a light receiving unit portion 12, a cover member 220, a sealing bonding material 130, and a housing 240.

[0119] The cover member 220 of the present embodiment has a dome shape including a convex surface 220a and a concave surface 220b provided on the opposite side of the convex surface 220a and recessed toward the convex surface 220a side. The housing 240 of the present embodiment includes a rectangular flat bottom portion 40a and a light-shielding wall portion 41.

[0120] The sealing bonding material 130 is a transparent material that seals (molds) the light emitting unit portion 11 and the light receiving unit portion 12. In the case of the present embodiment, the sealing bonding material 130 is disposed on the concave surface 220b of the cover member 220. The cover member 220 is joined to the housing 240 via the sealing bonding material 130 disposed on the concave surface 220b. In the case of the present embodiment, the sealing bonding material 130 also serves as a sealing member and a light-transmitting member. That is, the sealing member and the light-transmitting member are composed of a single material. In the present embodiment, two members that abut against each other among the sealing member, the light-transmitting member, and the cover member, namely the sealing member and the light-transmitting member, are composed of a single material.

[0121] The detection device 3C of the present embodiment can be assembled, for example, by filling the concave surface 220b of the cover member 220 with a liquid optical adhesive (the sealing and bonding material 130 before curing), and then covering the housing 240 holding the light emitting unit portion 11 and the light receiving unit portion 12 from the upper side of the cover member 220 and curing the optical adhesive. That is, the cover member 220 can be used as a container for storing the optical adhesive during the assembly of the detection device 3C.

[0122] In the case of the present embodiment, since the sealing and bonding material 130 also serves as a sealing member and a light transmissive member, the refractive indices of the sealing member, the light transmissive member, and the cover member 220 satisfy the relationship of n1 = n2 < n3. That is, in the present embodiment, there is also a structure in which there is no interface where the refractive index changes from large to small, that is, an interface that causes total reflection, in the optical path through which the light emitted from the light emitting unit portion 11 travels.

[0123] In the present embodiment, since the sealing and bonding material 130 that also serves as a sealing member and a light transmissive member is composed of a single material and thus has no interface inside, the light emitted from the light emitting unit portion 11 is not reflected inside the sealing and bonding material 130 and reaches the cover member 220. In addition, since the refractive index of the sealing and bonding material 130 is less than that of the cover member 220, the light emitted from the light emitting unit portion 11 does not undergo total reflection at the interface between the sealing and bonding material 130 and the cover member 220.

[0124] According to the detection device 3C of the present embodiment, similarly to the above-described embodiment, by eliminating the stray light component caused by total reflection, a high S / N ratio can be obtained in the light receiving unit portion 12, and thus the green light LG, the red light LR, or the near-infrared light LI passing through the living body can be detected with higher accuracy. In addition, in the detection device 3C of the present embodiment, by using the sealing and bonding material 130 in which the sealing member and the light transmissive member are composed of a single material, the interface between the sealing member and the light transmissive member is eliminated, and thus the light loss caused by Fresnel reflection can be further reduced.

[0125] As described above, the present invention has been described based on the above-described embodiments, but the present invention is not limited to the above-described embodiments and can be implemented in various ways without departing from the gist thereof.

[0126] For example, in the above-described embodiment, a human is exemplified as the living body, but the present invention can also be applied to the measurement of biological information (such as pulse) of other animals.

[0127] In addition, in the detection device 3 of the first embodiment, the case where the cover member 20 is adhered to the housing 40 is exemplified, but the cover member 20 can also be supported by the main body portion 1 of the measurement device 100. The cover member 20 can also be constituted by a part of the rear cover of the main body portion 1 of the measurement device 100.

[0128] In this case, the intermediate member 30 may not have an adhesive function either, and may be made of a viscous material having a prescribed refractive index, for example. In this case, after disposing the viscous material on the housing 40 assembled at a prescribed position within the main body portion 1, the assembly of the detection device and the measuring device is completed by mounting the cover member 20 on the main body portion 1.

[0129] In addition, in the measuring device 100 of the first embodiment, an example of the cover member 20 having a plano-convex shape in which one surface is a curved surface and the other surface is a flat surface is given, but the shape of the cover member is not limited to the plano-convex shape. For example, a plate-shaped cover member having both surfaces formed of flat surfaces may also be used.

[0130] In addition, in the measuring device 100 of the first embodiment, the case where the detection device 3 is provided within the main body portion 1 is given as an example, but the installation location of the detection device 3 is not limited thereto, and for example, it may also be buried in the reverse side of the watch band.

[0131] In addition, as the measuring device 100 of the first embodiment, a watch-type structure is given as an example, but the present invention can also be applied to, for example, a structure worn around the neck of the subject as a necklace-type, a structure pasted and worn on the body of the subject as a sticker-type, and a structure worn on the head of the subject as a head-mounted display-type.

[0132] In addition, in the detection device 3 of the first embodiment, the case where each of the light-emitting elements 50, 60, and 70 emits light in a time-division manner is given as an example, but since the first light-receiving element 51 corresponding to the green light LG of the first light-emitting element 50 is provided independently, the first light-emitting element 50 may also be lit constantly without time-division. Similarly, in the second to fourth embodiments as well, the first light-emitting element 50 may be lit constantly without time-division.

[0133] In addition, in the detection device 3C of the fourth embodiment, the case where the sealing bonding material 130 also serves as a sealing member and a light-transmissive member is given as an example, but the sealing bonding material 130 may also serve as all of the sealing member, the light-transmissive member, and the cover member. In this case, since the sealing bonding material 130 serves as all of the sealing member, the light-transmissive member, and the cover member, the refractive indices of the sealing member, the light-transmissive member, and the cover member satisfy the relationship of n1 = n2 = n3. That is, a structure is formed in which no refractive index difference is generated in the optical path through which the light emitted from the light-emitting unit portion 11 travels, and therefore, in addition to total reflection, light loss caused by Fresnel reflection can also be reduced. Therefore, by improving the light utilization efficiency of the light-emitting unit portion 11, further power consumption reduction can be achieved.

[0134] Thus, a structure in which the sealing bonding material also serves as all of the sealing member, the light-transmissive member, and the cover member can be assembled, for example, as follows: After filling a liquid optical adhesive (sealing bonding material before curing) in a mold having the same shape as the cover member 220, the housing 240 holding the light-emitting unit portion 11 and the light-receiving unit portion 12 is covered from above the mold to cure the optical adhesive, and then the mold is removed.

[0135] In addition, in the detection device 3A of the second embodiment, the intermediate member 30 may also serve as both the light-transmissive member and the cover member. That is, two members that abut against each other among the sealing member, the light-transmissive member, and the cover member, namely, the light-transmissive member and the cover member, may be formed of a single member. In this case, the refractive indices of the sealing member, the light-transmissive member, and the cover member satisfy the relationship of n1 < n2 = n3.

[0136] Thus, a structure in which the intermediate member 30 also serves as the light-transmissive member and the cover member can be assembled, for example, as follows: After filling a liquid optical adhesive (intermediate member before curing) in a mold having the same shape as the Figure 8 cover member 120 shown, the housing 40 sealed by the sealing member 42 is covered from above the mold to cure the optical adhesive, and then the mold is removed.

[0137] A detection device according to one aspect of the present invention may also have the following structure.

[0138] A detection device according to one aspect of the present invention includes: a light-emitting unit that emits light; a light-receiving unit that receives light emitted from the light-emitting unit and exiting from a living body; a housing that houses the light-emitting unit and the light-receiving unit; a sealing member that seals the light-emitting unit and the light-receiving unit in the housing; a cover member that covers the housing sealed by the sealing member; and a light-transmissive member that is formed of a light-transmissive resin and is interposed between the sealing member and the cover member. When the refractive indices of the sealing member, the light-transmissive member, and the cover member are n1, n2, and n3, respectively, they satisfy the relationship of n1 ≤ n2 ≤ n3.

[0139] In a detection device according to one aspect of the present invention, the following structure may also be adopted: The cover member includes a convex surface formed of a curved surface protruding toward the living body.

[0140] In a detection device according to one aspect of the present invention, the following structure may also be adopted: The cover member further includes a concave surface provided on the opposite side of the convex surface and recessed toward the convex surface side, and at least a part of the light-transmissive member is disposed on the concave surface.

[0141] In a detection device according to one aspect of the present invention, the following structure may also be adopted: The housing has a wall plate protruding from the sealing member toward the cover member side, the cover member includes a concave portion into which the wall plate is inserted, and the light-transmissive member is disposed between the concave portion and the wall plate.

[0142] In the detection device according to one embodiment of the present invention, the following structure may also be adopted: the sealing member, the light-transmitting member, and the cover member are made of a single material.

[0143] In the detection device according to one embodiment of the present invention, the following structure may also be adopted: two mutually abutting members among the sealing member, the light-transmitting member, and the cover member are made of a single material.

[0144] In the detection device according to one embodiment of the present invention, the following structure may also be adopted: the light-emitting unit includes: a first light-emitting element that emits first light having a green wavelength band; and a second light-emitting element that emits second light having a wavelength band longer than the green wavelength band, and the light-receiving unit includes: a first light-receiving element that receives the first light emitted from the first light-emitting element and emitted from the living body; and a second light-receiving element that receives the second light emitted from the second light-emitting element and emitted from the living body. When the direction in which the first light-emitting element and the second light-emitting element are arranged is defined as the first direction, and the direction intersecting the first direction is defined as the second direction, in the second direction, the first light-receiving element is disposed closer to the light-emitting unit than the second light-receiving element.

[0145] In the detection device according to one embodiment of the present invention, the following structure may also be adopted: the light-emitting unit further includes a third light-emitting element that emits third light having a wavelength band longer than the second light, and the third light emitted from the third light-emitting element and emitted from the living body is received by the second light-receiving element.

[0146] The detection device according to one embodiment of the present invention may also have the following structure.

[0147] The detection device according to one embodiment of the present invention includes: a light-emitting unit that emits light toward a living body; a light-receiving unit that receives light from the living body; a holding member that holds the light-emitting unit and the light-receiving unit; a light-shielding wall portion that is disposed between the light-emitting unit and the light-receiving unit of the holding member; a sealing member that seals the light-emitting unit and the light-receiving unit; a cover member that covers the holding member sealed by the sealing member; and a light-transmitting member that is interposed between the sealing member and the cover member. The wall portion is formed to define a storage space that separates the sealing member into a light-emitting unit and a light-receiving unit, and reaches the light-transmitting member from the bottom surface portion of the holding member. The refractive index value of the light-transmitting member is equal to or less than the refractive index value of the cover member.

[0148] The measuring device according to one embodiment of the present invention may also have the following structure.

[0149] The measuring device according to one embodiment of the present invention includes: the detection device according to the above embodiment; and an information analysis unit that determines biological information based on a detection signal indicating the detection result of the detection device.

Claims

1. A detection device, wherein, The detection device includes: a light-emitting unit that emits light; a light-receiving unit that receives the light emitted from the light-emitting unit and exiting from the living body; a holding member that holds the light-emitting unit and the light-receiving unit; a sealing member that seals the light-emitting unit and the light-receiving unit; a cover member that covers the holding member sealed by the sealing member; and a light-transmissive member that is interposed between the sealing member and the cover member, when the refractive indices of the sealing member, the light-transmissive member, and the cover member are set as n1, n2, and n3 respectively, the relationship of n1 ≤ n2 ≤ n3 is satisfied, the holding member has a plurality of wall portions, among the wall portions, the light-shielding wall portion disposed between the light-emitting unit and the light-receiving unit protrudes from the upper surface of the sealing member toward the cover member side, the cover member includes a concave portion, and the light-shielding wall portion is inserted into the concave portion, the light-transmissive member is disposed between the light-shielding wall portion inserted into the concave portion and the concave portion.

2. The detection device according to claim 1, wherein the cover member includes a convex surface formed by a curved surface protruding toward the living body.

3. The detection device according to claim 2, wherein the cover member has a dome shape that further includes a concave surface, the concave surface is provided on the opposite side of the convex surface and recesses toward the convex surface side, at least a part of the light-transmissive member is disposed on the concave surface.

4. The detection device according to any one of claims 1 to 3, wherein the sealing member, the light-transmissive member, and the cover member are made of a single material.

5. The detection device according to any one of claims 1 to 3, wherein two members in contact with each other among the sealing member, the light-transmissive member, and the cover member are made of a single material.

6. The detection device according to any one of claims 1 to 3, wherein the light-emitting unit includes: a first light-emitting element that emits first light; and a second light-emitting element that emits second light having a wavelength band longer than that of the first light, the light-receiving unit includes: a first light-receiving element that receives the first light emitted from the first light-emitting element and exiting from the living body; and a second light-receiving element that receives the second light emitted from the second light-emitting element and exiting from the living body, when the direction in which the first light-emitting element and the second light-emitting element are arranged is set as the first direction, and the direction intersecting with the first direction is set as the second direction, in the second direction, the first light-receiving element is disposed closer to the light-emitting unit than the second light-receiving element.

7. The detection device according to claim 6, wherein the light-emitting unit further includes a third light-emitting element that emits third light having a wavelength band longer than that of the second light, the third light emitted from the third light-emitting element and exiting from the living body is received by the second light-receiving element.

8. A detection device, wherein, The detection device includes: a light-emitting unit that emits light toward a living body; a light-receiving unit that receives light from the living body; a holding member that holds the light-emitting unit and the light-receiving unit; A wall member for light shielding, which is disposed at a portion of the holding member between the light emitting unit and the light receiving unit; A sealing member, which seals the light emitting unit and the light receiving unit; A cover member, which covers the holding member sealed by the sealing member; And A light transmissive member, which is sandwiched between the sealing member and the cover member, The wall member is formed to separate the sealing member into a storage space for the light emitting unit and the light receiving unit, and reaches the light transmissive member from the bottom surface of the holding member, When the refractive indices of the sealing member, the light transmissive member, and the cover member are set to n1, n2, and n3, respectively, the relationship of n1 ≤ n2 ≤ n3 is satisfied, The wall member for light shielding projects from the upper surface of the sealing member toward the cover member side, The cover member includes a recess, and the wall member for light shielding is inserted into the recess, The light transmissive member is disposed between the wall member for light shielding inserted into the recess and the recess.

9. A measuring device, wherein, This measuring device has: The detection device according to any one of claims 1 to 8; And An information analysis unit, which determines biological information based on a detection signal indicating the detection result of the detection device.

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