Detection and measurement devices

Abstract

To provide a detecting device and a measuring device with improved detection accuracy.SOLUTION: A detection device includes: a light emitting part for emitting light; a light receiving part for receiving light emitted from the light emitting part and injected from a living body; a holding member for holding the light emitting part and the light receiving part; a sealing member for sealing the light emitting part and the light receiving part; a cover member for covering the holding member sealed with the sealing member; and a translucent member interposed between the sealing member and the cover member. When refraction indexes of the sealing member, the translucent member, and the cover member are represented as n1, n2, and n3 respectively, the relationship of n1≤n2≤n3 is satisfied.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to detection and measurement devices. [Background technology]

[0002] Various measurement techniques for non-invasively measuring biological information such as pulse waves have been proposed. For example, Patent Document 1 below discloses a technique for improving the adhesion between a cover that covers the light-emitting unit and the light-receiving unit and the biological body in a detection device that includes a light-emitting unit that emits light into the biological body and a light-receiving unit that receives the light that is emitted from the light-emitting unit and reflected by the biological body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-353133 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above-described detection device has a problem in that light from the light-emitting portion is reflected by the rear surface of the cover member and enters the light-receiving portion as stray light, thereby reducing detection accuracy. [Means for solving the problem]

[0005] According to one aspect of the present invention, a light emitting unit that emits light and a biological a light receiving portion that receives light emitted from the light emitting portion, and a holding member that holds the light emitting portion and the light receiving portion. a sealing member that seals the light emitting unit and the light receiving unit; a cover member that covers the holding member; and a light-transmitting portion interposed between the sealing member and the cover member. and a material, and the refractive indexes of the sealing member, the light-transmitting member, and the cover member are respectively When n1, n2, and n3 are used,n1 <n2<n3 The relationship The holding member is The sealing member has a plurality of wall portions protruding toward the cover member, and the cover member has the plurality of wall portions. The light-transmitting member includes a recess into which at least one of the wall portions is inserted, and the light-transmitting member is inserted into the recess. and a recess. , a detection device is provided.

[0006] According to one aspect of the present invention, a light emitting unit that emits light to a living body and a light receiving unit that receives light from the living body are provided. Light reception a light receiving section for receiving the light; a holding member for holding the light emitting section and the light receiving section; a light-shielding wall portion disposed between the light-emitting portion and the light-receiving portion; a cover member that covers the holding member sealed by the sealing member; a light-transmitting member interposed between the sealing member and the cover member, and the wall portion The member is separated into accommodation spaces for the light emitting unit and the light receiving unit, and the The light-transmitting member is formed so as to reach the light-transmitting member, and the refractive index of the light-transmitting member is equal to that of the cover member. Refractive index value and the holding member protrudes from the sealing member toward the cover member. The cover member has a plurality of wall portions, and the cover member has a recess into which at least one of the plurality of wall portions is inserted. the light-transmitting member is disposed between the wall portion inserted into the recess and the recess. It is being A detection device is provided.

[0007] According to one aspect of the present invention, there is provided a measurement device including the detection device of the above aspect and an information analysis unit that identifies biological information from a detection signal that indicates a detection result by the detection device. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a side view of a measurement device according to a first embodiment. [Figure 2] FIG. 1 is a configuration diagram focusing on the functions of a measurement device. [Figure 3] FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. [Figure 5] FIG. 2 is a diagram for explaining the operation of the detection device. [Figure 6] 10 is a graph of simulation results showing the effectiveness of the detection device. [Figure 7] 1 is a graph showing the transmission spectrum of skin. [Figure 8] FIG. 6 is a cross-sectional view showing the configuration of a detection device according to a second embodiment. [Figure 9] FIG. 10 is a cross-sectional view showing the configuration of a detection device according to a third embodiment. [Figure 10] FIG. 10 is a cross-sectional view showing the configuration of a detection device according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of the present invention will be described below with reference to the drawings. Note that in the following drawings, the scale and angle of each component are different from the actual scale and angle in order to make each component large enough to be recognizable.

[0010] (First embodiment) FIG. 1 is a side view of a measurement device 100 according to a first embodiment. The measurement device 100 shown in FIG. 1 is a biometric device that noninvasively measures biometric information from a subject (e.g., a human), which is an example of a living organism. The measurement device 100 is attached to a measurement target site M on the subject's body. The measurement device 100 according to this embodiment is a wristwatch-type portable device that includes a main body 1 and a strap 2. The measurement device 100 can be attached to the subject's wrist by wrapping the band-like strap 2 around the wrist, which is an example of the measurement site (living organism) M. In this embodiment, the subject's pulse wave (e.g., pulse rate) and oxygen saturation (SpO2) are exemplified as biometric information. The pulse wave refers to the change in intravascular volume over time in response to heartbeats. The oxygen saturation refers to the percentage (%) of hemoglobin in the subject's blood that is bound to oxygen, and is an index for evaluating the subject's respiratory function.

[0011] Fig. 2 is a configuration diagram focusing on the functions of the measuring device 100. As shown in Fig. 2, 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 installed inside the main body 1. As shown in Fig. 1, the display device 4 is installed on the surface of the main body 1 opposite to the measurement site M, and displays various images including measurement results under the control of the control device 5. The display device 4 is, for example, a liquid crystal display panel.

[0012] The detection device 3 is an optical sensor module that generates a detection signal S corresponding to the state of the measurement site M. As shown in FIG. 1, the detection device 3 is installed, for example, on a surface (hereinafter referred to as the detection surface) 16 of the main body 1 that faces the measurement site M. The detection surface 16 is the surface that comes into contact with the measurement site M. As shown in FIG. 2, the detection device 3 of this embodiment includes a light-emitting unit (light-emitting unit) 11, a light-receiving unit (light-receiving unit) 12, a drive circuit 13, and an output circuit 14. Note that it is also possible to install one or both of the drive circuit 13 and the output circuit 14 as external circuits of the detection device 3. In other words, the drive circuit 13 and the output circuit 14 can be omitted from the detection device 3.

[0013] The light-emitting unit 11 has 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 toward the measurement site M.

[0014] The first light emitting element 50 emits green light (first light) LG having a green wavelength band of 520 nm to 550 nm toward the measurement site M. The green light LG in this embodiment is, for example, light with a peak wavelength of 520 nm. The second light emitting element 60 emits red light (second light) LR having a red wavelength band of, for example, 600 nm to 800 nm toward the measurement site M. The red light LR in this embodiment is light having a peak wavelength of, for example, 660 nm. The third light emitting element 70 emits near-infrared light (third light) LI having a near-infrared wavelength band of, for example, 800 nm to 1300 nm toward the measurement site M. The near-infrared light LI in this embodiment is light having a peak wavelength of, for example, 905 nm.

[0015] 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, bare chip type or bullet type LEDs (Light Emitting Diodes) are suitably used. Note that the wavelength of the light emitted by each light-emitting unit is not limited to the above-mentioned numerical range. Hereinafter, when the first light-emitting element 50, the second light-emitting element 60, and the third light-emitting element 70 are not particularly distinguished from each other, they will be collectively referred to as the light-emitting elements 50, 60, and 70, respectively.

[0016] The drive circuit 13 supplies a drive current to cause each of the light-emitting elements 50, 60, and 70 to emit light. The drive circuit 13 of this embodiment causes each of the light-emitting elements 50, 60, and 70 to emit light periodically in a time-division manner. Light emitted from each of the light-emitting elements 50, 60, and 70 enters the measurement site M and propagates while repeatedly being reflected and scattered within the measurement site M, before being emitted toward the main body 1 and reaching the light-receiving unit 12. In other words, the detection device 3 of this embodiment is a reflective optical sensor in which the light-emitting unit 11 and the light-receiving unit 12 are located on one side of the measurement site M.

[0017] The light-receiving unit 12 receives light arriving from the measurement site M due to the emission of light by the light-emitting unit 11. The light-receiving unit 12 of this embodiment has 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 according to the intensity of the received light. Hereinafter, when there is no need to particularly distinguish between the first light-receiving element 51 and the second light-receiving element 61, they will be collectively referred to as "respective light-receiving elements 51, 61."

[0018] The first light receiving element 51 receives green light LG emitted from the light emitting element 50 and propagated inside the measurement site M, and generates a detection signal according to the intensity of the received light. The second light receiving element 61 receives red light LR emitted from the second light emitting element 60 and propagated inside the measurement site M, or near-infrared light LI emitted from the third light emitting element 70 and propagated inside the measurement site M, and generates a detection signal according to the intensity of the received light.

[0019] 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 and 61 from analog to digital, and an amplifier circuit that amplifies the converted detection signals (both not shown), and generates multiple detection signals S (S1, S2, S3) corresponding to different wavelengths.

[0020] The detection signal S1 is a signal representing the light receiving intensity of the first light receiving element 51 when it receives green light LG emitted from the light emitting element 50. The detection signal S2 is a signal representing the light receiving intensity of the second light receiving element 61 when it receives red light LR emitted from the second light emitting element 60, and the detection signal S3 is a signal representing the light receiving intensity of the second light receiving element 61 when it receives near-infrared light LI emitted from the third light emitting element 70.

[0021] Generally, the amount of light absorbed by blood differs when blood vessels are dilated and when they are contracted, so each detection signal S becomes a pulse wave signal that includes a periodic fluctuation component corresponding to the pulsation component (volume pulse wave) of the artery inside the measurement site M.

[0022] The drive circuit 13 and the output circuit 14 are mounted in the form of IC chips on a wiring board together with the light-emitting unit 11 and the light-receiving unit 12. As described above, the drive circuit 13 and the output circuit 14 can also be installed outside the detection device 3.

[0023] The control device 5 is an arithmetic processing device such as a CPU (Central Processing Unit) or FPGA (Field-Programmable Gate Array), and controls the entire measuring device 100. The storage device 6 is composed of, for example, a nonvolatile semiconductor memory, and stores programs executed by the control device 5 and various data used by the control device 5. Note that a configuration in which the functions of the control device 5 are distributed across multiple integrated circuits, or a configuration in which some or all of the functions of the control device 5 are implemented by dedicated electronic circuits, may also be adopted. Note that, although FIG. 2 illustrates the control device 5 and the storage device 6 as separate elements, the control device 5 incorporating the storage device 6 may also be implemented by, for example, an ASIC (Application Specific Integrated Circuit) or the like.

[0024] The control device 5 of this embodiment executes a program stored in the storage device 6 to identify biological information of the subject from the multiple detection signals S (S1, S2, S3) generated by the detection device 3. Specifically, the control device 5 can identify the subject's pulse rate interval (PPI) from the detection signal S1 representing the light intensity of green light LG received by the first light receiving element 51. The control device 5 can also identify the subject's oxygen saturation (SpO2) by analyzing the detection signal S2 representing the light intensity of red light LR received by the second light receiving element 61 and the detection signal S3 representing the light intensity of near-infrared light LI received by the second light receiving element 61.

[0025] As described above, in the measuring device 100 of this embodiment, the control device 5 functions as an information analysis unit that identifies biological information from the detection signal S that indicates the detection result by the detection device 3. The control device (information analysis unit) 5 causes the display device 4 to display the biological information identified from the detection signal S. It is also possible to notify the user of the measurement results by audio output. It is also preferable to configure the device to issue a warning (of possible physical dysfunction) to the user if the pulse rate or oxygen saturation level fluctuates to a value outside a predetermined range.

[0026] Fig. 3 is a plan view of the detection device 3 of this embodiment. Fig. 4 is a cross-sectional view taken along the line IV-IV in Fig. 3. As shown in Figs. 3 and 4, the detection device 3 of this embodiment further includes a cover member 20, an intermediate member (light-transmitting member) 30, a housing 40, and a sealing member 42, in addition to the light-emitting unit 11 and the light-receiving unit 12. Note that the drive circuit 13 and the output circuit 14 are not shown in Figs. 3 and 4.

[0027] The configuration of the detection device 3 will be described below using an XYZ coordinate system. The X axis corresponds to the axis along the long side (one side) of the housing 40, which has a rectangular outer shape, the Y axis corresponds to the axis perpendicular to the X axis and along the short side (the other side) of the housing 40, and the Z axis corresponds to the axis perpendicular to the X axis and Y axis, respectively, and along the thickness direction of the housing 40.

[0028] As shown in FIGS. 3 and 4, the housing 40 is a member that holds the elements (light-emitting unit 11 and light-receiving unit 12) that make up the detection device 3. The housing 40 has a box shape that includes a rectangular, flat bottom surface 40a, a rectangular frame-shaped wall portion 40b that protrudes from the periphery of the bottom surface 40a toward the +Z side, and a light-shielding wall portion 41. The housing 40 is made of, for example, aluminum. An inner surface 40b1 of the wall portion 40b is colored black to provide light-shielding properties. This reduces reflection on the inner surface 40b1 of the wall portion 40b.

[0029] The housing 40 may be made of any material and manufactured by any method. For example, the housing 40 may be formed by injection molding of a resin material. Alternatively, the housing 40 may be formed integrally with the main body 1.

[0030] The light emitting unit 11 and the light receiving unit 12 are mounted on a wiring board (not shown) and are placed on the bottom surface 40a of the housing 40. The light-shielding wall 41 is disposed between the light-emitting unit 11 and the light-receiving unit 12 in the direction along the X-axis. The light-shielding wall 41 is a plate-shaped member that protrudes from the bottom surface 40a toward the +Z side and extends in the Y-axis direction, dividing the storage space within the housing 40 into two in the X-axis direction. That is, the light-shielding wall 41 separates the spaces that house the light-emitting unit 11 and the light-receiving unit 12 in the direction along the X-axis. The light-shielding wall 41 is a light-blocking wall that prevents light emitted from the light-emitting unit 11 from directly entering the light-receiving unit 12. In other words, the light-shielding wall 41 is a member that blocks part of the green light LG, the red light LR, and the near-infrared light LI. In the example of FIG. 4, the light-shielding wall 41 separates the sealing member 42 into the storage spaces for the light-emitting unit 11 and the light-receiving unit 12 and is formed to extend from the bottom surface 40a of the housing 40 to the intermediate member 30. In the present embodiment, the refractive index of the intermediate member 30 is equal to or less than the refractive index of the cover member 20, as will be described later.

[0031] The sealing member 42 is a transparent material that seals (molds) the light-emitting unit 11 and the light-receiving unit 12. For example, a light-transmitting UV-curable or ultraviolet-curable optical adhesive is used as the material for the sealing member 42. The refractive index of these optical adhesives is, for example, about 1.3 to 1.5.

[0032] The sealing member 42 fills the gap between the wall 40b and the light-emitting unit 11 and the light-receiving unit 12 housed in the housing 40. In this embodiment, the sealing member 42 seals the light-emitting elements 50, 60, and 70 and the light-receiving elements 51 and 61. In this embodiment, the upper surface of the sealing member 42 is flush with the upper surfaces of the walls 40b and 41 of the housing 40.

[0033] The cover member 20 covers the housing 40 sealed with the sealing member 42. The cover member 20 is made of, for example, a light-transmitting material. The cover member 20 is made of, for example, acrylic (refractive index: 1.49) or polycarbonate (refractive index: 1.585).

[0034] In this 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 a detection surface 16. In the cover member 20, the surface 20b on the side opposite to the convex surface 20a is formed as a flat surface. The cover member 20 of this embodiment is a plano-convex cover in which one surface is formed as a curved surface and the other surface is formed as a flat surface. According to the cover member 20 of this embodiment, since it has the detection surface 16 formed by the convex surface 20a, the detection surface 16 and the measurement site M can be brought into good contact with each other. 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.

[0035] The intermediate member 30 is a light-transmissive member provided 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 this 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.

[0036] The sealing member 42 and the intermediate member 30 are such that the refractive index n1 of the sealing member 42 is smaller than the refractive index n2 of the intermediate member 30, and the respective constituent materials are appropriately selected. Also, the intermediate member 30 and the cover member 20 are such that the refractive index n2 of the intermediate member 30 is smaller than the refractive index n3 of the cover member 20, and the respective constituent materials are appropriately selected. In this embodiment, the refractive indices of the sealing member 42, the intermediate member 30, and the cover member 20 satisfy the relationship n1 < n2 < n3.

[0037] It is desirable 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 be as small as possible. Also, it is desirable 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 be as small as possible.

[0038] The light emitting unit 11 is installed in the housing 40 so that the light emitting surfaces of the light emitting elements 50, 60, and 70 are parallel to the XY plane. That is, the light emitting elements 50, 60, and 70 emit light toward the +Z side. The light receiving unit 12 is installed in the housing 40 so that the light receiving surfaces of the light receiving elements 51 and 61 are parallel to the XY plane. That is, the light receiving elements 51 and 61 receive light incident from the Z direction.

[0039] 3, the light-emitting elements 50, 60, and 70 are arranged side by side in a direction (first direction) along the Y axis at intervals from one another. Specifically, the second light-emitting element 60 is arranged on the +Y side of the first light-emitting element 50, and the third light-emitting element 70 is arranged on the -Y side of the first light-emitting element 50. In other words, the first light-emitting element 50 is arranged between the second light-emitting element 60 and the third light-emitting element 70 in the direction along the Y axis. In other words, the first light-emitting element 50 is located between the second light-emitting element 60 and the third light-emitting element 70.

[0040] The light receiving elements 51, 61 are spaced apart and arranged side by side in a direction (second direction) along the X axis that intersects (is perpendicular to) the Y axis. Specifically, the first light receiving element 51 is arranged on the +X side of the light emitting unit 11, and the second light receiving element 61 is arranged on the +X side of the first light receiving element 51. In other words, the second light receiving element 61 is arranged on the opposite side of the first light receiving element 51 from the light emitting unit 11.

[0041] Here, the distance from the first light-emitting element 50 to the first light-receiving element 51 is defined as D1, the distance from the second light-emitting element 60 to the second light-receiving element 61 is defined as D2, and the distance from the third light-emitting element 70 to the second light-receiving element 61 is defined as D3. The distance D1 corresponds to the distance between the centers of the first light-emitting element 50 and the first light-receiving element 51 when viewed in a plane from the Z-axis direction. The distance D2 corresponds to the distance between the centers of the second light-emitting element 60 and the second light-receiving element 61 when viewed in a plane from the Z-axis direction. The distance D3 corresponds to the distance between the centers of the third light-emitting element 70 and the second light-receiving element 61 when viewed in a plane from the Z-axis direction.

[0042] In the detection device 3 of this 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. Note that the distances D2 and D3 are equal. As described above, the detecting device 3 of this embodiment employs a configuration in which the first light receiving element 51 for receiving the green light LG is disposed in a position closest to the first light emitting element 50 that emits the green light LG. In other words, the first light receiving element 51 is provided closer to the light emitting unit 11 than the second light receiving element 61.

[0043] 4, the first light receiving element 51 includes a sensor 511 and a band-pass filter 512. The sensor 511 is configured by, for example, a photodiode (PD).

[0044] The bandpass filter 512 has the property of selectively transmitting the wavelength band of green light LG and absorbing and cutting off light in other wavelength bands, that is, red light LR and near-infrared light LI. The bandpass filter 512 is formed, for example, by alternately laminating multiple low-refractive index layers such as silicon oxide and high-refractive index layers such as titanium oxide on the sensor 511. An angle limiting filter that limits the angle of incidence of light incident on the sensor 511 may be provided between the sensor 511 and the bandpass filter 512 .

[0045] The second light receiving element 61 also includes a sensor 611 that receives red light LR or near-infrared light LI. The sensor 611 is configured, for example, by a photodiode. The second light receiving element 61 has a different configuration from the first light receiving element 51 in that it does not include a bandpass filter that selectively transmits the red light LR or the near-infrared light LI. An angle limiting filter that limits the angle of incidence of light incident on the sensor 611 may be provided on the sensor 611.

[0046] Here, some of the red light LR and near-infrared light LI emitted from the second light-emitting element 60 may pass through the living body and be incident on the first light-receiving element 51. In this embodiment, the first light-receiving element 51 includes a band-pass filter 512 that selectively transmits green light LG. Therefore, the first light-receiving element 51 can cut out the red light LR and near-infrared light LI that have wavelength bands different from those of 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.

[0047] The operation of the detection device 3 of this embodiment will be described below. Figure 5 is a diagram for explaining the operation of the detection device 3. For example, the green light LG emitted from the first light emitting element 50 passes through the sealing member 42 and the intermediate member 30 in this order and enters the cover member 20. In the detection device 3 of this embodiment, an intermediate member 30 having a refractive index n2 between the sealing member 42 and the intermediate member 30 is provided between the sealing member 42 and the intermediate member 30. That is, in the detection device 3 of this embodiment, no air layer is present in the optical path from the light emitted from the light-emitting unit 11 to the light emitted from the cover member 20.

[0048] Here, as a comparative example, a detection device in which the intermediate member 30 is replaced with an air layer will be considered. That is, the detection device of the comparative example has a configuration in which an air layer is interposed in the optical path from the light emitted from the light-emitting unit 11 to the light emitted from the cover member 20.

[0049] 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 enters the air layer from the sealing member 42. In particular, in the case of the detection device of the comparative example, the green light LG enters the air layer with a low refractive index from the sealing member 42 with a high refractive index, and therefore, components that enter the air layer at angles of incidence greater than a predetermined angle are totally reflected. Note that, like the green light LG, components of the red light LR or near-infrared light LI emitted from the light-emitting unit 11 that enter the air layer at angles of incidence greater than a predetermined angle are also totally reflected.

[0050] In this way, 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 living body inside the measurement site M. Hereinafter, light that heads toward the light receiving element without passing through the living body will be referred to as a "stray light component." 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, and therefore the amount of stray light components directed toward the first light receiving element 51 and the second light receiving element 61 increases.

[0051] In contrast, in the case of the detection device 3 of this embodiment, when the green light LG emitted from the light-emitting unit 11 enters the intermediate member 30 from the sealing member 42, which has a low refractive index, it enters the intermediate member 30, which has a high refractive index, and therefore does not undergo total reflection. Furthermore, when the green light LG emitted from the light-emitting unit 11 enters the cover member 20 from the intermediate member 30, it enters the cover member 20 with a high refractive index from the intermediate member 30 with a low refractive index, and therefore does not undergo total reflection. In other words, the green light LG can efficiently enter the measurement site M through the cover member 20 with total reflection suppressed.

[0052] Furthermore, the red light LR or near-infrared light LI emitted from the light-emitting unit 11 can be efficiently incident on the measurement site M through the cover member 20 in a state where total reflection is suppressed, similar to the green light LG.

[0053] The present inventors conducted a simulation to verify the effectiveness of the detection device 3 of this embodiment. Fig. 6 is a graph showing the results of this simulation. In this simulation, the ratio of the amount of stray light component received by the first light receiving element 51 when green light was emitted at the same power was calculated for a model equivalent to the detection device 3 and a model equivalent to a comparative example detection device in which the intermediate member 30 was replaced with an air layer.

[0054] As shown in FIG. 6, when the amount of received stray light in the detection device of the comparative example is set to 1.0, the ratio of the amount of received stray light in the detection device 3 of the present embodiment is 0.03 (3.0%). That is, it was confirmed that in the detection device of the comparative example, the amount of stray light incident on the first light receiving element 51 increases due to total reflection occurring in the air layer existing between the intermediate member 30 and the cover member 20. On the other hand, in the detection device 3 of the present embodiment, it was confirmed that by providing the intermediate member 30, the amount of received stray light in the first light receiving element 51 can be significantly reduced by eliminating the stray light component due to total reflection.

[0055] The inventors of the present invention also conducted a similar simulation when the wavelength of the light to be emitted 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 reception efficiency of the light receiving element can be improved by suppressing total reflection at the interface between the sealing member 42 and the cover member 20.

[0056] 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 having refractive indices satisfying the relationship of n1 < n2 < n3 are provided, total 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 passing through the living body can be efficiently incident on the light receiving unit 12.

[0057] Further, in the detection device 3 of the present embodiment, by suppressing total reflection, the amount of stray light incident on the first light receiving element 51 and the second light receiving element 61 can be reduced. As a result, the detection device 3 of the present embodiment can obtain a high S / N ratio by suppressing the incidence of stray light components that become noise.

[0058] 4, the detection device 3 of this embodiment can reduce the gap between the measurement site M and the cover member 20 by providing the cover member 20 with a convex surface 20a. This can prevent external light entering through the gap between the measurement site M and the cover member 20 from entering the light-receiving unit 12 as a stray light component.

[0059] In the detection device 3 of this embodiment, the first light receiving element 51 is disposed at a position closest to the first light emitting element 50 that emits green light LG.

[0060] Figure 7 is a graph showing the transmission spectrum of skin. In Figure 7, the horizontal axis represents the wavelength of light, and the vertical axis represents the transmittance (unit: %). Figure 7 shows the transmission spectrum when the skin thickness is 0.43 mm as an example.

[0061] As shown in Figure 7, when the wavelength band of green light LG (e.g., 520 nm) enters the skin, the transmittance is about 30%, when the wavelength band of red light LR (e.g., 660 nm) enters the skin, the transmittance is about 45%, and when the wavelength band of near-infrared light LI (e.g., 905 nm) enters the skin, the transmittance is about 60%.

[0062] The graph shown in Figure 7 shows that the distance that light can propagate within a living body varies depending on the wavelength of light. That is, the graph in Figure 7 shows that green light LG can propagate only a shorter distance within a living body than red light LR or near-infrared light LI. In other words, red light LR and near-infrared light LI can propagate farther within a living body than green light LG. Note that Figure 7 uses an example where the skin thickness is 0.43 mm, but even when the skin thickness is different, it can be said that red light LR and near-infrared light LI can propagate farther within a living body than green light LG.

[0063] In this way, in the detection device 3 of this embodiment, by arranging the first light receiving element 51 and the first light emitting element 50 closely, the green light LG emitted from the first light emitting element 50 propagates a short distance within the living body and enters the first light receiving element 51. As shown in the graph of FIG. 7, since the green light LG can only propagate a short distance within the living body, 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 be entered at a high intensity by the first light receiving element 51. Therefore, in the detection device 3 of this embodiment, even if the amount of green light LG emitted by the first light emitting element 50 is reduced, the green light LG that has propagated within the living body can be sufficiently detected by the first light receiving element 51. Therefore, the detection device 3 of this embodiment can accurately detect the green light LG with the first light receiving element 51 while suppressing the amount of green light LG emitted from the first light emitting element 50 and reducing the power consumption of the light emitting unit 11.

[0064] Furthermore, in the detection device 3 of this 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 greater than the distance D1 between the first light-emitting element 50 and the first light-receiving element 51. In other words, the distance that the red light LR and the near-infrared light LI propagate within the living body before being incident on the second light-receiving element 61 is greater than the distance that the green light LG propagates within the living body before being incident on the first light-receiving element 51.

[0065] 7, the green light LG can only propagate a shorter distance inside a living body than the red light LR or the near-infrared light LI. Therefore, even if the green light LG propagates inside a living body so as to reach the second light receiving element 61, the green light LG is sufficiently attenuated as it passes through the living body. Therefore, the green light LG cannot enter the second light receiving element 61.

[0066] On the other hand, the red light LR and the near-infrared light LI can propagate farther inside the living body than the green light LG. Therefore, even if the red light LR and the near-infrared light LI propagate a longer distance inside the living body than the green light LG, they can be incident with a sufficient amount of light on the second light receiving element 61, which is farther away from the light-emitting unit 11.

[0067] In the present embodiment, since only red light LR and near-infrared light LI are incident on the second light receiving element 61, there is no need to provide the second light receiving element 61 with a bandpass filter that selectively transmits the red light LR and near-infrared light LI and blocks the green light LG. That is, the detection device 3 of this embodiment can employ the above-described configuration in which only the first light receiving element 51 includes the bandpass filter 512 and the second light receiving element 61 does not include a bandpass filter. Therefore, the detection device 3 of this embodiment can reduce costs by omitting the bandpass filter of the second light receiving element 61.

[0068] As described above, the detection device 3 of this embodiment can achieve high detection accuracy by eliminating stray light components due to total reflection and thereby increasing the S / N ratio of the light-receiving unit 12. Therefore, the light-receiving unit 12 can receive light sufficiently even with a small amount of light due to its high detection accuracy, and therefore the power consumption of the light-emitting unit 11 can be reduced by reducing the amount of light emitted by each of the light-emitting elements 50, 60, and 70.

[0069] Therefore, according to the measuring device 100 of this embodiment, since it is equipped with the detecting device 3, it is possible to provide a bio-measuring instrument that is capable of highly accurate detection while suppressing power consumption.

[0070] (Second embodiment) Next, a detection device of a second embodiment will be described. The detection device of this embodiment differs from the first embodiment in the configuration of the cover member. Hereinafter, the same reference numerals will be used for the configurations and members common to the first embodiment, and the reference numerals will be omitted for details.

[0071] FIG. 8 is a cross-sectional view showing the configuration of the detection device of the present embodiment. FIG. 8 corresponds to FIG. 4 of the first embodiment. As shown in FIG. 8, 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.

[0072] 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 side opposite to 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 is filled in 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. Note that the intermediate member 30 may be disposed in a state of protruding from the concave surface 120b of the cover member 120.

[0073] The detection device 3A of the present embodiment can be assembled, for example, by filling a liquid optical adhesive (intermediate member 30 before curing) in the concave surface 120b of the cover member 120 and then covering the housing 40 sealed with the sealing member 42 from above the cover member 120 to cure the optical adhesive. That is, the cover member 120 can be used as a container for accommodating the optical adhesive during the assembly of the detection device 3A.

[0074] Also in the present embodiment, the refractive indices of the sealing member 42, the intermediate member 30, and the cover member 120 satisfy the relationship of n1 < n2 < n3. That is, also in the present embodiment, a configuration is provided in which an 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 located in the optical path along which the light emitted from the light emitting unit portion 11 travels.

[0075] According to the detection device 3A of this embodiment, as in the above embodiment, by eliminating stray light components due to total reflection, a high S / N ratio can be obtained in the light receiving unit 12, and the green light LG, red light LR, or near-infrared light LI that has passed through the living body can be detected with higher accuracy, thereby achieving low power consumption.

[0076] (Third embodiment) Next, a detection device of a third embodiment will be described. The detection device of this embodiment differs from the first embodiment in the configuration of the cover member. Hereinafter, the same reference numerals will be used for the configurations and members common to the first embodiment, and the reference numerals will be omitted for details.

[0077] Fig. 9 is a cross-sectional view showing the configuration of the detection device of this embodiment, which corresponds to Fig. 4 of the first embodiment. As shown in FIG. 9, the detection device 3B of this embodiment includes a light-emitting unit 11, a light-receiving unit 12, a cover member 20, an intermediate member 30, a housing 140, and a sealing member .

[0078] The housing 140 of this 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 to the +Z side, and a light-shielding wall portion 141.

[0079] In this embodiment, the housing 140 includes a recess 20c into which at least one of the multiple wall portions 140b, 141 is inserted. In this embodiment, the light-shielding wall portion 141 protrudes upward (toward the +Z side) beyond the wall portion 140b. The wall portion 141 also protrudes upward (toward the +Z side) beyond the upper surface 42a of the sealing member 42.

[0080] In the present embodiment, the cover member 20 is provided on a surface 20b opposite to the convex surface 20a with a recess 20c for avoiding contact with a wall portion 141 of the housing 140. A light-blocking 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.

[0081] Here, it is necessary to precisely align the cover member 20 with the housing 140 that houses the light-emitting unit 11 and the light-receiving unit 12. When fitting the wall portion 141 into the recess 20c, even if the tolerances of the cover member 20 and the housing 140 are strictly controlled and the parts are manufactured with high precision, a gap is likely to occur between the wall portion 141 and the recess 20c.

[0082] In contrast, in the detection device 3B of this embodiment, the size of the recess 20c is designed to be sufficiently larger than the wall 141, and the gap occurring between the recess 20c and the wall 141 is filled with the intermediate member 30. According to the detection device 3B of this embodiment, after applying a transparent adhesive material or transparent resin to the surface of the sealing member 42, the wall 141 of the housing 140 is inserted into the recess 20c of the cover member 20, and the adhesive material or transparent resin is cured in a state where the gap between the recess 20c and the wall 141 is filled with the intermediate member 30, thereby assembling the configuration shown in FIG. 9. Therefore, according to the detection device 3B of this embodiment, even when using a housing 140 in which the wall 141 protrudes relative to the other wall 140b, there is no need to strictly control the tolerances of the parts, which makes manufacturing easier and reduces costs.

[0083] According to the detection device 3B of this embodiment, as in the above embodiment, by eliminating stray light components due to total reflection, a high S / N ratio can be obtained in the light-receiving unit 12, thereby enabling more accurate detection of green light LG, red light LR, or near-infrared light LI that has passed through the living body. Furthermore, in the detection device 3B of this embodiment, the light-shielding wall 141 is made taller, making it more difficult for light to be directly incident from the light-emitting unit 11 onto the light-receiving unit 12. This makes it easier to suppress the incidence of stray light components on the light-receiving unit 12, thereby further improving the detection accuracy of the light-receiving unit 12. This allows for even lower power consumption.

[0084] (Fourth embodiment) Next, a detection device of a fourth embodiment will be described. The detection device of this embodiment differs from the first embodiment in the configuration of the cover member. Hereinafter, the same reference numerals will be used for the configurations and members common to the first embodiment, and the reference numerals will be omitted for details.

[0085] Fig. 10 is a cross-sectional view showing the configuration of the detection device of this embodiment, which corresponds to Fig. 4 of the first embodiment. As shown in FIG. 10, a detection device 3C of this embodiment includes a light-emitting unit 11, a light-receiving unit 12, a cover member 220, a sealing bonding material 130, and a housing 240.

[0086] The cover member 220 of this 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. The housing 240 of this embodiment includes a rectangular flat bottom surface 40a and a light-shielding wall portion 41.

[0087] The sealing adhesive 130 is a transparent material that seals (molds) the light-emitting unit 11 and the light-receiving unit 12. In this embodiment, the sealing adhesive 130 is disposed on the concave surface 220b of the cover member 220. The cover member 220 is bonded to the housing 240 via the sealing adhesive 130 disposed on the concave surface 220b. In this embodiment, the sealing adhesive 130 serves as both a sealing member and a light-transmitting member. That is, the sealing member and the light-transmitting member are made of a single material. In this embodiment, the sealing member and the light-transmitting member, which are two members that abut against each other among the sealing member, the light-transmitting member, and the cover member, are made of a single material.

[0088] The detection device 3C of this embodiment can be assembled by, for example, filling the concave surface 220b of the cover member 220 with a liquid optical adhesive (the sealing bonding material 130 before hardening), then covering the cover member 220 from above with the housing 240 that holds the light-emitting unit 11 and the light-receiving unit 12, and hardening the optical adhesive. In other words, the cover member 220 can be used as a container for storing the optical adhesive when assembling the detection device 3C.

[0089] In the case of this embodiment, since the sealing 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 n1 = n2 < n3. That is, also in this embodiment, there is no interface in the optical path through which the light emitted from the light-emitting unit portion 11 travels where the refractive index changes from large to small, that is, an interface that causes total reflection.

[0090] In this embodiment, the sealing 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. Therefore, the light emitted from the light-emitting unit portion 11 reaches the cover member 220 without being reflected inside the sealing bonding material 130. Further, since the refractive index of the sealing bonding material 130 is smaller than the refractive index of the cover member 220, the light emitted from the light-emitting unit portion 11 is not totally reflected at the interface between the sealing bonding material 130 and the cover member 220.

[0091] According to the detection device 3C of this embodiment, similar to the above embodiment, by eliminating stray light components due to total reflection, a high S / N ratio can be obtained in the light-receiving unit portion 12, and thus the green light LG, red light LR, or near-infrared light LI that has passed through the living body can be detected with higher accuracy. Further, in the detection device 3C of this embodiment, by using the sealing 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 due to Fresnel reflection can be further reduced.

[0092] As described above, the present invention has been described based on the above-described embodiments. However, the present invention is not limited to the above embodiments, and can be implemented in various aspects without departing from the gist thereof. For example, in the above embodiment, a human is exemplified as the living body. However, the present invention is also applicable to the measurement of biological information (for example, pulse) of other animals.

[0093] Furthermore, in the detection device 3 of the first embodiment, the case where the cover member 20 is attached to the housing 40 has been exemplified, but the cover member 20 may be supported by the main body 1 of the measurement device 100. The cover member 20 may be configured as part of the back cover of the main body 1 of the measurement device 100. In this case, the intermediate member 30 does not need to have an adhesive function and may be made of, for example, a viscous material with a predetermined refractive index. In this case, the viscous material is placed on the housing 40 incorporated in a predetermined position within the main body 1, and then the cover member 20 is attached to the main body 1, thereby completing the assembly of the detection device and the measurement device.

[0094] Furthermore, in the measuring device 100 of the first embodiment, the cover member 20 is a plano-convex type having one curved surface and the other planar surface, but the shape of the cover member is not limited to the plano-convex type. For example, a plate-shaped cover member having planar surfaces on both sides may be used.

[0095] Furthermore, in the first embodiment of the measuring device 100, the case where the detection device 3 is provided inside the main body 1 is given as an example, but the installation location of the detection device 3 is not limited to this, and it may be embedded on the back side of the belt, for example.

[0096] Furthermore, although a wristwatch-type configuration has been given as an example of the measuring device 100 of the first embodiment, the present invention can also be applied to other configurations, such as a necklace-type configuration worn around the subject's neck, a sticker-type configuration worn by sticking it to the subject's body, or a head-mounted display-type configuration worn on the subject's head.

[0097] Furthermore, in the detection device 3 of the first embodiment, an example has been given in which each of the light-emitting elements 50, 60, 70 emits light in a time-division manner, but since the first light-receiving element 51 corresponding to the green light LG of the first light-emitting element 50 is separately provided, the first light-emitting element 50 may be constantly lit rather than time-divisionally. Similarly, in the second to fourth embodiments, the first light-emitting element 50 may be constantly lit rather than time-divisionally.

[0098] In addition, in the detection device 3C of the fourth embodiment, although the case where the sealing bonding material 130 also serves as a sealing member and a light-transmissive member has been described as an example, 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, since there is no refractive index difference in the optical path through which the light emitted from the light-emitting unit portion 11 travels, it is possible to reduce the light loss due to Fresnel reflection in addition to total reflection. Therefore, further power consumption reduction can be achieved by increasing the light utilization efficiency of the light-emitting unit portion 11.

[0099] A configuration in which the sealing bonding material serves as all of the sealing member, the light-transmissive member, and the cover member as described above can be assembled, for example, by filling a liquid optical adhesive (sealing bonding material before curing) into a mold having the same shape as the cover member 220, covering the housing 240 holding the light-emitting unit portion 11 and the light-receiving unit portion 12 from above the mold to cure the optical adhesive, and removing the mold.

[0100] In addition, in the detection device 3A of the second embodiment, the intermediate member 30 may also serve as both a light-transmissive member and a cover member. That is, the light-transmissive member and the cover member, which are two members that abut each other among the sealing member, the light-transmissive member, and the cover member, may be formed as 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.

[0101] A configuration in which the intermediate member 30 serves as both a light-transmissive member and a cover member as described above can be assembled, for example, by filling a liquid optical adhesive (intermediate member before curing) into a mold having the same shape as the cover member 120 shown in FIG. 8, covering the housing 40 sealed with the sealing member 42 from above the mold to cure the optical adhesive, and removing the mold.

[0102] The detection device according to one aspect of the present invention may have the following configuration. A detection device according to one embodiment of the present invention comprises 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 case 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 within the case, a cover member that covers the case sealed with the sealing member, and a light-transmitting member made of a light-transmitting resin that is interposed between the sealing member and the cover member, and satisfies the relationship n1≦n2≦n3, where n1, n2, and n3 are the refractive indices of the sealing member, the light-transmitting member, and the cover member, respectively.

[0103] In the detection device according to one aspect of the present invention, the cover member may include a convex surface that is a curved surface that protrudes toward the living body.

[0104] In one aspect of the detection device of the present invention, the cover member may further include a concave surface that is provided on the opposite side to the convex surface and is recessed toward the convex surface, and at least a portion of the translucent member may be arranged on the concave surface.

[0105] In one aspect of the detection device of the present invention, the case may have a wall plate protruding from the sealing member toward the cover portion, the cover member may include a recess into which the wall plate is inserted, and the translucent member may be arranged between the recess and the wall plate.

[0106] In the detection device according to one aspect of the present invention, the sealing member, the light-transmitting member, and the cover member may be configured to be made of a single material.

[0107] In the detection device according to one aspect of the present invention, any two members that come into contact with each other out of the sealing member, the light-transmitting member, and the cover member may be made of a single material.

[0108] In one embodiment of the detection device of the present invention, 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, and when the direction in which the first light-emitting element and the second light-emitting element are aligned is defined as a first direction and the direction intersecting the first direction is defined as a second direction, the first light-receiving element may be configured to be closer to the light-emitting unit in the second direction than the second light-receiving element.

[0109] In one embodiment of the detection device of the present invention, the light-emitting unit may further include a third light-emitting element that emits third light having a wavelength band longer than that of the second light, and the third light emitted from the third light-emitting element and emitted from the living body may be received by the second light-receiving element.

[0110] The detection device according to one aspect of the present invention may have the following configuration. A detection device according to one embodiment of the present invention comprises an emitter that emits light onto a living body, a light-receiving unit that receives light from the living body, a holding member that holds the emitter and the light-receiving unit, a light-shielding wall portion that is arranged between the emitter and the light-receiving unit of the holding member, a sealing member that seals the emitter and the light-receiving unit, a cover member that covers the holding member sealed with the sealing member, and a translucent member that is interposed between the sealing member and the cover member, wherein the wall portion separates the sealing member into storage spaces for the emitter and the light-receiving unit and is formed to reach the translucent member from the bottom of the holding member, and the refractive index of the translucent member is equal to or less than the refractive index of the cover member.

[0111] The measurement device according to one aspect of the present invention may have the following configuration. A measurement device according to one aspect of the present invention includes the detection device according to the above aspect, and an information analysis unit that identifies biological information from a detection signal that indicates a detection result by the detection device. [Explanation of symbols]

[0112] 3, 3A, 3B, 3C...detection device, 5...control device (information analysis section), 11...light-emitting unit section (light-emitting section), 12...light-receiving unit section (light-receiving section), 20, 120, 220...cover member, 20a, 120a, 220a...convex surface, 20c...concave portion, 30...intermediate member (light-transmitting member), 40...casing (holding member), 40a...bottom surface portion, 40b, 41, 140b ,141...wall portion, 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...measurement site (living body), S1, S2, S3...detection signal.

Claims

1. a light-emitting unit that emits light; a light receiving unit that receives light emitted from the light emitting unit and emitted 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; a light-transmitting member 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 n1, n2, and n3, respectively, the relationship n1<n2<n3 is satisfied, the holding member has a plurality of wall portions protruding from the sealing member toward the cover member, the cover member includes a recess into which at least one of the plurality of wall portions is inserted; the light-transmitting member is disposed between the wall portion inserted into the recess and the recess; Detection device.

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

3. the cover member has a dome shape that further includes a concave surface that is provided on the opposite side to the convex surface and is recessed toward the convex surface, At least a portion of the light-transmitting member is disposed on the concave surface. The detection device according to claim 2 .

4. 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, 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 a direction in which the first light-emitting element and the second light-emitting element are arranged is defined as a first direction, and a direction intersecting the first direction is defined as a second direction, In the second direction, the first light receiving element is provided closer to the light emitting unit than the second light receiving element. The detection device according to any one of claims 1 to 3.

5. 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 emitted from the living body is received by the second light-receiving element. The detection device according to claim 4 .

6. a light-emitting unit that emits light into the 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 disposed between the light-emitting portion and the light-receiving portion 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; a light-transmitting member interposed between the sealing member and the cover member, the wall portion separates the sealing member into accommodation spaces for the light-emitting portion and the light-receiving portion, and is formed so as to extend from a bottom surface of the holding member to the light-transmitting member; a refractive index value of the translucent member is less than a refractive index value of the cover member; the holding member has a plurality of wall portions protruding from the sealing member toward the cover member, the cover member includes a recess into which at least one of the plurality of wall portions is inserted; the light-transmitting member is disposed between the wall portion inserted into the recess and the recess; Detection device.

7. A detection device according to any one of claims 1 to 6; an information analysis unit that identifies biological information from a detection signal indicating a detection result by the detection device, Measuring equipment.

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