JP2023066093A - Detecting device and measuring device - Google Patents

Abstract

To provide a detecting device and a measuring device that have improved detection accuracy while achieving low power consumption.SOLUTION: A detecting device of the present invention includes a light emitting part for emitting light onto a living body, a light receiving part for receiving light from the living body, and a case for storing the light emitting part and the light receiving part. The case includes a first storage part for storing the light emitting part, a second storage part for storing the light receiving part, and a separation wall for separating the first storage part and the second storage part. The first storage part includes a first bottom plate for supporting the light emitting part, and a plurality of first wall plates protruding from the first bottom plate. The second storage part includes a second bottom plate for supporting the light receiving part, and a plurality of second wall plates protruding from the second bottom plate. At least one of the plurality of first wall plates is composed of a light reflective material. The second bottom plate and the plurality of second wall plates are composed of a light blocking material.SELECTED DRAWING: Figure 4

Description

The present invention relates to detection and measurement devices.

Various measurement techniques for noninvasively measuring biological information such as pulse waves have been proposed. For example, Patent Literature 1 below describes a detection device that includes a light emitting unit that emits light into a living body and a light receiving unit that receives the incident light emitted from the light emitting unit and reflected by the living body. A technique is disclosed for taking measures against stray light in a light receiving section by installing a light shielding member between the light receiving section and the light receiving section.

JP 2013-63203 A

However, in the above detection device, there is room for improvement in the light utilization efficiency from the light emitting unit. Therefore, by increasing the light utilization efficiency of the light emitting unit, power consumption can be reduced and the detection accuracy of the light receiving unit can be improved. The provision of new technology has been desired.

According to one aspect of the present invention, a light-emitting unit that emits light to a living body, a light-receiving unit that receives the light from the living body, and a case that houses the light-emitting unit and the light-receiving unit, The case includes a first accommodating portion that accommodates the light emitting portion and a second accommodating portion that accommodates the light receiving portion, the first accommodating portion including a first bottom plate that supports the light emitting portion; and a plurality of first wall plates protruding from one bottom plate, in the plate material that partitions the first housing portion, wherein at least one of the plurality of first wall plates is made of a light-reflective resin, and the A detection device is provided in which the plate material that partitions the second housing portion is made of a light-shielding resin.

According to one aspect of the present invention, there is provided a measuring device comprising the detection device of the aspect described above and an information analysis section that specifies biological information from a detection signal indicating a detection result of the detection device.

It is a side view of the measuring device concerning a 1st embodiment. 1 is a configuration diagram focusing on functions of a measuring device; FIG. It is a top view of a detection apparatus. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3; It is a figure for demonstrating operation|movement of a detection apparatus. It is a graph which shows this simulation result. It is a graph which shows this simulation result. It is a graph which shows this simulation result. It is a sectional view showing composition of a detecting device of a 2nd embodiment. It is a top view which shows the structure of the detection apparatus of 2nd Embodiment. It is a sectional view showing composition of a detecting device of a 3rd embodiment. It is a top view which shows the structure of the detection apparatus of 3rd Embodiment. It is a sectional view showing composition of a detecting device of a 4th embodiment. It is a top view which shows the structure of the detection apparatus of 4th Embodiment. It is a sectional view showing composition of a detecting device of a 5th embodiment. It is a top view which shows the structure of the detection apparatus of 5th Embodiment.

An embodiment of the present invention will be described below with reference to the drawings. In each drawing below, the scale and angle of each member are different from the actual ones in order to make each member recognizable in size.

(First embodiment)
FIG. 1 is a side view of the measuring device 100 of the first embodiment. A measuring device 100 of the present embodiment shown in FIG. 1 is a bioinstrumentation device that noninvasively measures biometric information of a subject (for example, a human being), which is an example of a living body. It is attached to a site (hereinafter referred to as "measurement site") M. The measurement apparatus 100 of the present embodiment is a wristwatch-type portable device that includes a housing unit 1 and a belt 2. By winding the belt-shaped belt 2 around the wrist, which is an example of the measurement site (living body) M, the subject can be measured. can be worn on the wrist of In this embodiment, the subject's pulse wave (for example, pulse interval PPI) and oxygen saturation (SpO2) are exemplified as biological information. A pulse wave means a temporal change in volume in a blood vessel linked to the heartbeat. Oxygen saturation means the ratio (%) of hemoglobin bound to oxygen in the hemoglobin in the blood of the subject, and is an index for evaluating the respiratory function of the subject.

FIG. 2 is a configuration diagram focusing on the functions of the measuring device 100. As shown in FIG. 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 casing 1 . As shown in FIG. 1, the display device 4 is installed on the surface of the housing 1 opposite to the measurement site M, and displays various images including measurement results under the control of the control device 5. do. The display device 4 is, for example, a liquid crystal display panel.

The detection device 3 is an optical sensor module that generates a detection signal S corresponding to the state of the measurement site M. FIG. As shown in FIG. 1, the detection device 3 is installed, for example, on a surface (hereinafter referred to as a detection surface) 16 of the housing 1 facing the measurement site M. As shown in FIG. The detection surface 16 is the surface that contacts the measurement site M. As shown in FIG. As shown in FIG. 2, the detection device 3 of this embodiment includes a light-emitting unit section 11, a light-receiving unit section 12, a drive circuit 13, and an output circuit . One or both of the drive circuit 13 and the output circuit 14 can be installed 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 .

The light emitting unit section 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 to the measurement site M, respectively.

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

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 preferably used. In addition, the wavelength of the light emitted from each light emitting unit is not limited to the numerical range described above. Hereinafter, the first light emitting element 50, the second light emitting element 60, and the third light emitting element 70 are collectively referred to as the respective light emitting elements 50, 60, and 70, unless otherwise distinguished.

The drive circuit 13 causes each of the light emitting elements 50, 60, 70 to emit light by supplying a drive current. The drive circuit 13 of the present embodiment periodically causes each of the light emitting elements 50, 60, 70 to emit light in a time division manner. The light emitted from each of the light emitting elements 50, 60, and 70 is incident on the measurement site M, propagates while repeating reflection and scattering inside the measurement site M, and is then emitted toward the housing section 1 to reach the light receiving unit section 12. to reach That is, the detection device 3 of this embodiment is a reflective optical sensor in which the light emitting unit portion 11 and the light receiving unit portion 12 are positioned on one side of the measurement site M. As shown in FIG.

The light receiving unit section 12 receives light coming from the measurement site M by light emission of the light emitting unit section 11 . The light receiving unit section 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 the first light receiving element 51 and the second light receiving element 61 are not particularly distinguished, they are collectively referred to as "each light receiving element 51, 61".

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

The output circuit 14 includes, for example, an A/D converter that converts the detection signal generated by each of the light receiving elements 51 and 61 from analog to digital, and an amplifier circuit that amplifies the converted detection signal. are not shown) to generate a plurality of detection signals S (S1, S2, S3) corresponding to different wavelengths.

The detection signal S1 is a signal representing the intensity of light received by the first light receiving element 51 when the green light LG emitted from the light emitting element 50 is received. The detection signal S2 is a signal representing the received light intensity of the second light receiving element 61 when the red light LR emitted from the second light emitting element 60 is received. It is a signal representing the intensity of light received by the second light receiving element 61 when the near-infrared light LI is received.

Since the amount of light absorbed by blood is generally different between when the blood vessel dilates and when it contracts, each detection signal S is a periodic variation corresponding to the pulsation component (volume pulse wave) of the artery inside the measurement site M. A pulse wave signal containing components is obtained.

The drive circuit 13 and the output circuit 14 are mounted on the wiring substrate together with the light emitting unit section 11 and the light receiving unit section 12 in the form of an IC chip. It should be noted that the drive circuit 13 and the output circuit 14 can be installed outside the detection device 3 as described above.

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 measuring device 100 as a whole. The storage device 6 is configured 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 . A configuration in which the functions of the control device 5 are distributed over a plurality of integrated circuits, or a configuration in which some or all of the functions of the control device 5 are realized by a dedicated electronic circuit may be employed. In FIG. 2, the control device 5 and the storage device 6 are illustrated as separate elements, but the control device 5 including the storage device 6 can be implemented by, for example, an ASIC (Application Specific Integrated Circuit). .

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

As described above, in the measurement device 100 , the control device 5 functions as an information analysis section that identifies biological information from 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 specified from the detection signal S. FIG. It is also possible to inform the user of the measurement result by voice output. It is also preferable to issue a warning (possibility of physical function impairment) to the user when the pulse rate or oxygen saturation fluctuates to a numerical value outside a predetermined range.

FIG. 3 is a plan view of the detection device 3. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. FIG. As shown in FIGS. 3 and 4, the detection device 3 of the present embodiment includes a light emitting unit (light emitting unit) 11 and a light receiving unit (light receiving unit) 12, a case 40, a sealing layer 42, is further provided. 3 and 4, illustration of the drive circuit 13 and the output circuit 14 is omitted.

The configuration of the detection device 3 will be described below using the XYZ coordinate system. The X-axis corresponds to the axis along the long side (one side) of the case 40 having a rectangular outer shape, and the Y-axis is perpendicular to the X-axis and corresponds to the axis along the short side (the other side) of the case 40. The Z-axis corresponds to an axis perpendicular to the X-axis and the Y-axis and along the normal line of the detection surface 16 in contact with the measurement site M.

As shown in FIGS. 3 and 4, the case 40 accommodates each element (the light emitting unit section 11 and the light receiving unit section 12) that constitutes the detection device 3. As shown in FIG.
The case 40 of the present embodiment includes a first accommodation portion 140A that accommodates the light emitting unit portion 11, a second accommodation portion 150A that accommodates the light receiving unit portion 12, and a partition between the first accommodation portion 140A and the second accommodation portion 150A. a partition wall 149;

The first housing portion 140A includes a rectangular bottom plate (first bottom plate) 140 and a plurality of wall plates 141, 142, 143, and 144. As shown in FIG. In the case of this embodiment, the first housing portion 140A is partitioned by the bottom plate 140 and the wall plates 141, 142, 143, and 144. As shown in FIG.

The bottom plate 140 supports the light emitting unit section 11 . A plurality of wall plates 141, 142, 143, and 144 protrude from the bottom plate 140 toward the +Z side. The first accommodating portion 140A is formed in a bottomed tubular body having a bottom plate on one end side (−Z side). In the case of this embodiment, the light emitting unit section 11 is mounted on a wiring board (not shown) and installed in the first accommodating section 140A inside the case 40 .

The wall plate 141 is a plate-shaped member that protrudes from the +X side peripheral edge of the bottom plate 140 toward the +Z side and extends in the Y-axis direction. The wall plate 141 is provided on the +X side of the light emitting unit section 11 . That is, the wall plate 141 is provided between the light emitting unit section 11 and the light receiving unit section 12 side.

The wall plate 142 is a plate-like member that protrudes from the −X side peripheral edge of the bottom plate 140 toward the +Z side and extends in the Y-axis direction. The wall plate 142 is provided on the bottom plate 140 so as to face the wall plate 141 in the direction along the X axis. The wall plate 142 is provided on the −X side of the light emitting unit section 11 . That is, the wall plate 142 is provided on the opposite side of the light emitting unit section 11 to the light receiving unit section 12 . The wall plate 141 and the wall plate 142 are arranged side by side in the direction along the X-axis with a space between them.

The wall plates 143 and 144 are arranged side by side in a direction along the Y-axis that intersects (perpendicularly) with the X-axis. The wall plate 143 is provided on the +Y side of the wall plate 141 and the wall plate 142 . The wall plate 143 is a plate-shaped member that protrudes from the +Y side peripheral edge of the bottom plate 140 toward the +Z side and extends in the X-axis direction.
The wall plate 144 is provided on the -Y side of the wall plate 141 and the wall plate 142 . The wall plate 144 is a plate-like member that protrudes from the −Y side peripheral edge of the bottom plate 140 toward the +Z side and extends in the X-axis direction. The wall plate 144 is provided on the bottom plate 140 so as to face the wall plate 143 in the direction along the Y axis.

In this embodiment, the bottom plate 140 and the plurality of wall plates 141, 142, 143, and 144 that partition the first accommodating portion 140A are made of a light reflective material. Examples of light-reflecting materials include light-reflecting resins such as white epoxy resins, polypropylene resins, and polycarbonate resins, and metals such as aluminum. It should be noted that the light reflectivity may be further enhanced by incorporating metal particles into the light reflective resin.

In this embodiment, part of the light radially emitted from the light-emitting unit section 11 is reflected by the bottom plate 140 and the wall plates 141, 142, 143, and 144 and enters the living body. Based on such a configuration, the first housing portion 140A enhances the light utilization efficiency of the light emitting unit portion 11 .

The second housing portion 150A includes a rectangular bottom plate 150 and a plurality of wall plates 151, 152, 153, and 154. As shown in FIG. In the case of this embodiment, the second housing portion 150A is partitioned by the bottom plate 150 and the wall plates 151, 152, 153, and 154. As shown in FIG.

The bottom plate 150 supports the light receiving unit section 12 . A plurality of wall plates 151, 152, 153, and 154 protrude from the bottom plate 150 toward the +Z side. The second housing portion 150A is formed in a bottomed tubular body having a bottom plate on one end side (−Z side). In the case of this embodiment, the light receiving unit section 12 is installed in the second housing section 150A in the case 40 while being mounted on a wiring board (not shown).

The wall plate 151 is a plate-like member that protrudes from the −X side peripheral edge of the bottom plate 150 toward the +Z side and extends in the Y-axis direction. The wall plate 151 is provided on the −X side of the light receiving unit section 12 . That is, the wall plate 151 is provided between the light emitting unit section 11 and the light receiving unit section 12 .

The wall portion 152 is a plate-shaped member that protrudes from the +X side peripheral edge of the bottom plate 150 toward the +Z side and extends in the Y-axis direction. The wall portion 152 is provided on the bottom plate 150 so as to face the wall plate 151 in the direction along the X axis. The wall portion 152 is provided on the +X side of the light receiving unit portion 12 . That is, the wall portion 152 is provided on the opposite side of the light receiving unit portion 12 to the light emitting unit portion 11 . The wall plate 151 and the wall portion 152 are arranged side by side in the direction along the X-axis with a space therebetween.

The walls 153 and 154 are arranged side by side in a direction along the Y-axis that intersects (perpendicularly) with the X-axis. The wall portion 153 is provided on the +Y side of the wall plate 151 and the wall portion 152 . The wall portion 153 is a plate-shaped member that protrudes from the +Y side peripheral edge of the bottom plate 150 toward the +Z side and extends in the X-axis direction.
The wall portion 154 is provided on the −Y side of the wall plate 151 and the wall portion 152 . The wall portion 154 is a plate-shaped member that protrudes from the −Y side peripheral edge of the bottom plate 150 toward the +Z side and extends in the X-axis direction. The wall portion 154 is provided on the bottom plate 150 so as to face the wall portion 153 in the direction along the Y-axis.

In this embodiment, the bottom plate 150 and the plurality of wall plates 151, 152, 153, and 154 that partition the second housing portion 150A are made of a light shielding material. Examples of light-shielding materials include black resins containing carbon black, iron oxide, titanium, and the like.
This suppresses light reflected by the bottom plate 150 and the wall plates 151, 152, 153, and 154 from entering the light receiving unit 12 as stray light.

The partition wall 149 functions as a light shielding wall that prevents the light emitted from the light emitting unit section 11 from directly entering the light receiving unit section 12 .
In this embodiment, the partition wall 149 includes one wall plate 141 facing the second housing portion 150A in the first housing portion 140A and one wall facing the first housing portion 140A in the second housing portion 150A. and a plate 151 .

The case 40 of the present embodiment is manufactured by forming the first housing portion 140A and the second housing portion 150A separately and then integrating the first housing portion 140A and the second housing portion 150A. The surface 141a of the wall plate 141 of the first accommodation portion 140A and the surface 151a of the wall plate 151 of the second accommodation portion 150A are integrated by, for example, heat sealing. The +X side surface of the bottom plate 140 of the first storage portion 140A and the -X side surface of the bottom plate 150 of the second storage portion 150A are integrated by, for example, heat sealing.

In addition, the manufacturing method of the case 40 is not limited to the above. For example, a resin substrate in which the bottom plate 140 and the bottom plate 150 are integrally molded is prepared. You may manufacture case 40 by forming respectively.

As shown in FIG. 4 , the sealing layer 42 is a light-transmissive resin material filled in the gap between the light emitting unit section 11 and the light receiving unit section 12 housed in the case 40 and the case 40 . The sealing layer 42 seals (molds) the light emitting unit section 11 and the light receiving unit section 12 inside the case 40 . A surface of the sealing layer 42 functions as the detection surface 16 . In FIG. 3, the illustration of the sealing layer 42 is omitted in order to make the drawing easier to see.
It should be noted that instead of the configuration of sealing with the sealing layer 42, a configuration of covering the upper surface of the case 40 with a translucent substrate may be adopted. In this case, the upper surface of the translucent substrate functions as the detection surface 16 .

Each light emitting element 50, 60, 70 is installed in the case 40 so that the light emitting surface is parallel to the XY plane. That is, each light emitting element 50, 60, 70 emits light toward the +Z side.

As shown in FIG. 3, the light emitting elements 50, 60, and 70 are arranged side by side in the direction (first direction) along the Y-axis at intervals. 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 . That is, 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 positioned between the second light emitting element 60 and the third light emitting element 70 .

As shown in FIG. 3, the light receiving elements 51 and 61 are spaced apart from each other and arranged side by side in a direction (second direction) along the X axis that intersects (perpendicularly) with the Y axis. Specifically, the first light receiving element 51 is arranged on the +X side of the light emitting unit section 11 , and the second light receiving element 61 is arranged on the +X side of the first light receiving element 51 . That is, the first light receiving element 51 is arranged on the opposite side of the light emitting unit section 11 with the second light receiving element 61 interposed therebetween.

Here, the distance from the first light emitting element 50 to the first light receiving element 51 is D1, the distance from the second light emitting element 60 to the second light receiving element 61 is D2, and the distance from the third light emitting element 70 to the second light receiving element 61 is D2. Let the distance be 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 from above in the Z-axis direction. Further, 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 from above in the Z-axis direction. Further, the distance D3 corresponds to the distance between the center portions of the third light emitting element 70 and the second light receiving element 61 when viewed from above in the Z-axis direction.

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 . Also, 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 distance D2 and the distance D3 are equal.
As described above, the detection device 3 of the present embodiment employs a configuration in which the first light receiving element 51 for receiving the green light LG is arranged at a position closest to the first light emitting element 50 for emitting the green light LG. .

As shown in FIG. 4, the first light receiving element 51 includes a sensor 120, an angle limiting filter 121, and a bandpass filter 122.

The sensor 120 is composed of, for example, a photodiode (PD). The angle limiting filter 121 is provided so as to cover the entire light receiving surface 120 a of the sensor 120 . The angle limiting filter 121 is formed, for example, by embedding a plug 1222 made of a light shielding material such as tungsten in a silicon oxide layer 1211 having optical transparency.

The silicon oxide layer 1211 forms an optical path that guides light to the light receiving surface 120 a of the sensor 120 . A plug 1222 embedded in the silicon oxide layer 1211 limits the incident angle of light passing through the optical path (silicon oxide layer 1211). That is, when the light incident on the silicon oxide layer 1211 is tilted with respect to the optical path by more than a predetermined angle, the incident light strikes the plug 1222, part of the light is absorbed by the plug 1222, and the rest is reflected. . Since the intensity of the reflected light is weakened due to repeated reflections before passing through the optical path, the light that can finally pass through the angle limiting filter 121 is substantially tilted at the predetermined limiting angle with respect to the optical path. limited to light within

The angle limiting filter 121 has a characteristic of transmitting light incident at an angle smaller than a predetermined incident angle and cutting light incident at an angle greater than the predetermined incident angle without transmitting it. This allows the angle limiting filter 121 to limit the incident angle of light incident on the sensor 120 . Specifically, the angle limiting filter 121 transmits light that is incident at a predetermined incident angle (hereinafter referred to as an allowable incident angle) by propagating inside the living body, and prevents external light such as sunlight from entering the living body. It cuts the light that is incident at an angle larger than the allowable incident angle, such as light with

The bandpass filter 122 has a characteristic of selectively transmitting the wavelength band of the green light LG and absorbing and cutting the red light LR and the near-infrared light LI, which are light in other wavelength bands. The bandpass filter 122 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 angle limiting filter 121 .

The second light receiving element 61 includes a sensor 220 that receives red light LR or near-infrared light LI, and an angle limiting filter 221 that limits the incident angle of the red light LR or near-infrared light LI reaching the sensor 220. ,including. That is, in the detection device 3 of the present embodiment, the second light receiving element 61 has a configuration different from that of 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. have.

The sensor 220 is composed of, for example, a photodiode. Angle limiting filter 221 is provided on light receiving surface 220 a of sensor 220 . The angle limiting filter 221 has the same configuration as the angle limiting filter 121 and can limit the incident angle of the red light LR or the near-infrared light LI reaching the sensor 220 . The angle limiting filter 221 transmits, for example, red light LR or near-infrared light LI that propagates in the living body and is incident at an allowable incident angle, and external light such as sunlight or red light LR or near-infrared light LI that has not passed through the living body. It cuts light incident at an angle larger than the allowable incident angle, such as near-infrared light LI.

Here, part of the red light LR and the near-infrared light LI emitted from the second light emitting element 60 may pass through the living body and enter the first light receiving element 51 . In this embodiment, the first light receiving element 51 includes a bandpass filter 122 that selectively transmits the green light LG. Therefore, the first light receiving element 51 can cut the red light LR and the near-infrared light LI, which have different wavelength bands 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 .

In this embodiment, the second accommodation section 150A has angle limiting filters 121 and 221 that limit the incident angle of light to the light receiving unit section 12 (light receiving elements 51 and 61).

The operation of the detection device 3 of this embodiment will be described below. FIG. 5 is a diagram for explaining the operation of the detection device 3. FIG.
In the detection device 3 of this embodiment, the green light LG emitted from the first light emitting element 50 is emitted in all directions due to the Lambertian distribution. As shown in FIG. 5, part of the green light LG emitted from the first light emitting element 50 is reflected by any of the light-reflective wall plates 141, 142, 143, 144 that partition the first housing portion 140A ( For example, the light is reflected by the wall plate 142) and enters the living body.

Similarly, part of the red light LR or the near-infrared light LI emitted from each light emitting element 60, 70 is reflected by the wall plates 141, 142, 143, 144 having light reflectivity and enters the living body.
A part of the light emitted from each light emitting element 50, 60, 70 may be reflected by any one of the wall plates 141, 142, 143, 144 and then reflected by the bottom plate 140 to enter the living body. be.

In the detection device 3 of the present embodiment, external light SL such as sunlight may enter the second housing portion 150A through the gap between the living body and the detection surface 16 . At this time, part of the external light SL is blocked by any one of the wall plates 151, 152, 153, and 154 (for example, the wall plate 151) that partitions the second housing portion 150A and has a light blocking property.

The present inventors conducted simulations to verify the ratio of the amount of light emitted from the light emitting unit 11 and taken into the living body due to the difference in the material of the plate material that partitions the first accommodating portion 140A. FIG. 6A is a graph showing the results of this simulation. In this simulation, the configuration corresponding to the detection device 3 of the present embodiment in which the bottom plate 140 and the wall plates 141, 142, 143, and 144 that partition the first housing portion 140A are made of light-reflective resin, the bottom plate 140 and With respect to the configuration corresponding to the detection device of the comparative example in which the wall plates 141, 142, 143, and 144 are made of black resin, which is a light-shielding material, for example, when green light is emitted with the same power, each emission amount I asked for a ratio.

As shown in FIG. 6A, when the light emission amount of the comparative example is used as a reference, the light emission amount of the detection device 3 of the present embodiment has a difference of about 1.8 times.
That is, when all of the plate materials that partition the first housing portion 140A are made of black resin, part of the light emitted from the light emitting unit portion 11 with a Lambertian distribution is emitted from the surrounding plate materials that partition the first housing portion 140A. It was confirmed that the amount of light emitted from the light emitting unit 11 and incident on the living body was reduced due to absorption of the light, and the light utilization efficiency of the light emitting unit 11 was reduced.

On the other hand, when all the plate materials that partition the first housing portion 140A are made of light-reflective resin as in the detection device 3 of the present embodiment, the light from the surrounding wall plate that partitions the first housing portion 140A It was confirmed that the light utilization efficiency of the light emitting unit section 11 can be improved by suppressing the absorption and increasing the amount of light incident on the living body.

Also, the inventors conducted similar simulations for the case where the wavelength of light incident on the living body was varied. As a result, it was confirmed that the light utilization efficiency of the light emitting unit section 11 can be improved by increasing the amount of light incident on the living body by means of the first accommodation section 140A, regardless of the wavelength band of the light incident on the living body.

In the detection device 3 of the present embodiment, as described above, part of the light emitted from the light emitting unit 11 is reflected by the bottom plate 140 and the wall plates 141, 142, 143, and 144, thereby increasing the amount of light incident on the living body. be able to. As described above, according to the detection device 3 of the present embodiment, it was confirmed by the simulation that the light emitted from the light emitting unit section 11 can be efficiently incident on the living body.

In addition, the inventors conducted simulations to verify the ratio of the amount of light received by the light receiving unit section 12 due to the difference in the material of the plate material that partitions the second housing section 150A. FIG. 6B is a graph showing the results of this simulation. In this simulation, the configuration corresponding to the detection device 3 of the present embodiment in which the bottom plate 150 and the wall plates 151, 152, 153, and 154 that partition the second housing portion 150A are made of black resin, and the bottom plate 150 and the wall plates For a configuration corresponding to the detection device of the comparative example in which 151, 152, 153, and 154 are made of light-reflective resin, for example, the ratio of the amount of light received when green light is emitted with the same power is obtained.

As shown in FIG. 6B, when the amount of light received by the detection device 3 of the present embodiment is used as a reference, the amount of light received by the detection device of the comparative example is about 0.8 times.
In other words, in the case of the configuration of the comparative example in which all of the plate materials that partition the second housing portion 150A are made of light-reflective resin, the bottom plate 150 and the wall plates 151, 152, 153, and 154 receive light through the gaps between the living body and the detection surface 16. It was confirmed that the amount of light received by the light-receiving unit 12 was reduced due to an increase in the noise component due to part of the external light such as sunlight reflected by the surrounding plate material that partitions the second housing portion 150A.

On the other hand, if all the plate members that partition the second housing portion 150A are made of black resin as in the detection device 3 of the present embodiment, the surrounding plate members that partition the second housing portion 150A are affected by external light. It was confirmed by the simulation that the noise component incident on the light receiving unit 12 is reduced and the amount of light received by the light receiving unit 12 is increased because the reflection is suppressed.

In addition, the present inventors verified the relationship between the wavelength of light emitted from the light emitting element and the optimum distance between the light emitting element and the light receiving element by simulation. FIG. 7 is a graph showing the results of this simulation. In the graph shown in FIG. 7, the horizontal axis indicates the wavelength of light, and the vertical axis indicates the light receiving peak position where the amount of received light transmitted through the living body is maximum, that is, the distance from the light emitting element to the light receiving element. FIG. 7 shows, as an example, the light reception peak position when light is incident from an oblique direction that is 20° toward the light receiving section with respect to the normal direction of the skin.

As shown in the graph of FIG. 7, the wavelength band of green light (e.g., 520 nm) has the shortest light reception peak position, the wavelength band of near-infrared light (e.g., 905 nm) has the longest light reception peak position, and the red light wavelength band has the longest light reception peak position. (for example, 660 nm) is located between the green light and near-infrared light receiving positions.

According to the graph of FIG. 7, when the light-receiving element that receives green light is placed closer to the light-emitting element than the light-receiving part that receives red light or near-infrared light, the green light that has passed through the living body is efficiently received. I have confirmed that it is possible. That is, it was confirmed that red light or near-infrared light can propagate through the body over a longer distance than green light. In other words, green light is more easily attenuated in the living body than red light or near-infrared light, and cannot propagate in the living body for a long time.

In the detection device 3 of this embodiment, the distance D1 between the first light emitting element 50 and the first light receiving element 51 is replaced by the distance between the second light emitting element 60 or the third light emitting element 70 and the second light receiving element 61 (distance D2 or distance D3) is smaller.

In the case of this embodiment, since the first light receiving element 51 is arranged at the position closest to the first light emitting element 50, the green light LG propagating through the living body and entering the first light receiving element 51 can be efficiently received. can be done. Also, as described above, the red light LR and the near-infrared light LI can propagate farther in the body than the green light LG. Therefore, the second light-receiving element 61 can efficiently receive the red light LR and the near-infrared light LI that have propagated in the living body over a longer distance than the green light LG.
As described above, the detection device 3 of the present embodiment can accurately detect the green light LG, the red light LR, and the near-infrared light LI propagated in the living body by the light receiving unit section 12 .

Further, as shown in FIG. 5, in the detection device 3 of the present embodiment, part of the green light LG emitted from the first light emitting element 50 is reflected by, for example, the surface of the living body (measurement site M). , the light may directly enter the first light receiving element 51 without passing through the living body. Also, external light such as sunlight may directly enter the first light receiving element 51 through the gap between the living body and the detection surface 16 . Hereinafter, the green light LG that is reflected by the living body surface (measurement site M) and travels toward the first light receiving element 51 without passing through the living body is referred to as "first stray light component SL1", and the external light that travels directly toward the first light receiving element 51 is referred to as " 2nd stray light component SL2''.

Since the first stray light component SL1 has a green wavelength band, it passes through the bandpass filter 122 and enters the angle limiting filter 121 provided below the bandpass filter 122 . As described above, the angle limiting filter 121 has the characteristic of transmitting light incident at an angle smaller than the allowable incident angle and cutting light incident at an angle larger than the allowable incident angle.

Since the first stray light component SL 1 enters the first light receiving element 51 without passing through the living body, the incident angle of the green light LG with respect to the first light receiving element 51 is larger than the allowable incident angle of the angle limiting filter 121 . That is, the first stray light component SL1 is cut by the angle limiting filter 121. FIG. Thereby, the first light receiving element 51 can suppress the incidence of the first stray light component SL1 on the light receiving surface 120a of the sensor 120 by the angle limiting filter 121 .

Although the second stray light component SL2 is mostly cut by the bandpass filter 122, the component having the green wavelength band included in the second stray light component SL2 is transmitted through the bandpass filter 122. Here, since the second stray light component SL2 is incident from the gap between the living body and the detection surface 16 as described above, the incident angle of the second stray light component SL2 with respect to the first light receiving element 51 is the allowable incident angle of the angle limiting filter 121. be larger than Therefore, part of the second stray light component SL2 that has passed through the bandpass filter 122 (the component having the green wavelength band) is cut by the angle limiting filter 121 . Thereby, the angle limiting filter 121 of the first light receiving element 51 can suppress the second stray light component SL2 from entering the light receiving surface 120a of the sensor 120 .

As described above, in the detection device 3 of the present embodiment, the green light LG emitted from the light emitting unit section 11 and passed through the living body can be efficiently incident on the light receiving surface 120a of the sensor 120 . Further, in the detection device 3 of the present embodiment, it is possible to make it difficult for the first stray light component SL1 and the second stray light component SL2 to enter the light receiving surface 120a of the sensor 120. FIG.

Further, as described above, in the detection device 3 of the present embodiment, even when the external light SL such as sunlight enters the second housing portion 150A through the gap between the living body and the detection surface 16, the external light SL is not received by the second housing portion 150A. The light is shielded by one of the wall plates 151, 152, 153, and 154 (for example, the wall plate 151) that partitions the portion 150A and has a light shielding property. Therefore, in the detection device 3 of the present embodiment, it is possible to make it difficult for the external light SL that has entered the second housing portion 150A to enter the first light receiving element 51 .

Therefore, the first light receiving element 51 suppresses the incidence of the first stray light component SL1 and the second stray light component SL2, which are noise components, and the external light SL reflected by the plate material that partitions the second housing portion 150A. , a high S/N ratio can be obtained.
Therefore, in the detecting device 3 of the present embodiment, the first light receiving element 51 can receive the green light LG with high accuracy. power consumption can be reduced.

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 equal to the distance between the first light emitting element 50 and the first light receiving element 51 is greater than the distance D1. In other words, the distance that the red light LR and the near-infrared light LI propagate in the living body before being incident on the second light receiving element 61 is is greater than the distance to

As described above, the green light LG can propagate only a short distance inside the living body compared to the red light LR or the near-infrared light LI. Therefore, if the green light LG propagates through the living body so that it can reach the second light receiving element 61, the green light LG is sufficiently attenuated when passing through the living body. Therefore, the green light LG cannot enter the second light receiving element 61 .

On the other hand, the red light LR and the near-infrared light LI can propagate farther inside the body than the green light LG. Therefore, even when the red light LR and the near-infrared light LI propagate in the living body over a longer distance than the green light LG, they have a sufficient amount of light for the second light receiving element 61 further away from the light emitting unit 11. Injection is possible in the state of

In the case of the present embodiment, only the red light LR and the near-infrared light LI enter the second light receiving element 61, so the red light LR and the near-infrared light LI are selectively transmitted, and the green light LG is cut. It is not necessary to provide the second light receiving element 61 with a band-pass filter for this purpose. That is, in the detecting device 3 of the present embodiment, it is possible to employ the above configuration in which only the first light receiving element 51 includes the bandpass filter 122 and the second light receiving element 61 does not include the bandpass filter. Therefore, the detection device 3 of the present embodiment can achieve cost reduction by omitting the band-pass filter of the second light receiving element 61 .

Part of the red light LR emitted from the second light emitting element 60 or part of the near-infrared light LI emitted from the third light emitting element 70 is reflected by the surface of the living body (measurement site M) and produced. The light may directly enter the second light receiving element 61 without passing through the body. Also, external light such as sunlight may directly enter the second light receiving element 61 through the gap between the living body and the detection surface 16 . Hereinafter, the red light LR or the near-infrared light LI that is reflected by the surface of the living body (measurement site M) and directly travels toward the second light receiving element 61 without passing through the living body will be collectively referred to as the "third stray light component SL3" and the second received light component. The external light directly directed toward the element 61 is referred to as "fourth stray light component SL4".

Since the third stray light component SL3 enters the angle limiting filter 221 without passing through the living body, the incident angle of the third stray light component SL3 to the second light receiving element 61 is larger than the allowable incident angle of the angle limiting filter 221. Also, since the fourth stray light component SL4 is incident from the gap between the living body and the detection surface 16, the incident angle of the fourth stray light component SL4 with respect to the second light receiving element 61 is larger than the allowable incident angle of the angle limiting filter 221.

Therefore, the third stray light component SL3 and the fourth stray light component SL4 are satisfactorily cut by the angle limiting filter 221. FIG. Thereby, the second light receiving element 61 can suppress the incidence of the third stray light component SL3 and the fourth stray light component SL4 to the light receiving surface 220a of the sensor 120 by the angle limiting filter 221. FIG.

As described above, in the detection device 3 of the present embodiment, the red light LR or the near-infrared light LI emitted from the light emitting unit 11 and passed through the living body can be efficiently incident on the light receiving surface 220 a of the sensor 220 . Further, in the detection device 3 of the present embodiment, it is possible to make it difficult for the third stray light component SL3 and the fourth stray light component SL4 to enter the light receiving surface 220a of the sensor 220 . In addition, by suppressing the reflection of external light on the plate material that defines the second housing portion 150A, it is possible to make it difficult for the light to enter the light receiving surface 220a of the sensor 220. FIG.

Further, as described above, in the detection device 3 of the present embodiment, even when the external light SL such as sunlight enters the second housing portion 150A through the gap between the living body and the detection surface 16, the external light SL is not received by the second housing portion 150A. The light is shielded by one of the wall plates 151, 152, 153, and 154 (for example, the wall plate 151) that partitions the portion 150A and has a light shielding property. Therefore, in the detection device 3 of the present embodiment, it is possible to make it difficult for the external light SL that has entered the second housing portion 150A to enter the second light receiving element 61 .

Therefore, the second light receiving element 61 suppresses the incidence of the third stray light component SL3 and the fourth stray light component SL4, which are noise components, and the external light SL reflected by the plate material that partitions the second housing portion 150A. , a high S/N ratio can be obtained. According to the detection device 3 of the present embodiment, since the red light LR and the near-infrared light LI are efficiently received by the second light receiving element 61, the respective light emission amounts of the second light emitting element 60 and the third light emitting element 70 are Thus, the power consumption of the light emitting unit section 11 can be suppressed.

As described above, according to the detection device 3 of the present embodiment, it is possible to increase the detection accuracy of the light receiving unit 12 while reducing power consumption by increasing the light utilization efficiency of the light emitting unit 11 .
Therefore, according to the measuring device 100 of the present embodiment, since the detection device 3 is provided, it is possible to provide a bioinstrumentation device that enables highly accurate detection while suppressing power consumption.

(Second embodiment)
Next, a detection device according to a second embodiment will be described. The detection device of this embodiment differs from that of the first embodiment in the configuration of the case. Hereinafter, the same reference numerals are given to the same configurations and members as in the first embodiment, and the reference numerals for details are omitted.

FIG. 8A is a cross-sectional view showing the configuration of the detection device of this embodiment. FIG. 8B is a plan view showing the configuration of the detection device of this embodiment. 8A is a diagram corresponding to FIG. 4 of the first embodiment, and FIG. 8B is a diagram corresponding to FIG. 3 of the first embodiment.
As shown in FIGS. 8A and 8B, the detection device 203 of this embodiment includes a light-emitting unit section 11, a light-receiving unit section 12, a case 40A, and a sealing layer . The case 40A of the present embodiment has a first accommodation portion 240A that accommodates the light emitting unit portion 11, a second accommodation portion 250A that accommodates the light receiving unit portion 12, and a partition wall 149.

The first housing portion 240A includes a bottom plate (first bottom plate) 240 and a plurality of wall plates 141, 142, 143, and 144. As shown in FIG. In the case of this embodiment, the first housing portion 240A is partitioned by the bottom plate 240 and the wall plates 141, 142, 143, and 144. As shown in FIG.

The second housing portion 250A includes a bottom plate (second bottom plate) 250 and a plurality of wall plates 151 , 152 , 153 , and 154 . In the case of this embodiment, the second housing portion 250A is partitioned by the bottom plate 250 and the wall plates 151, 152, 153, and 154. As shown in FIG.

The bottom plate 250 constitutes the entire bottom plate of the case 40A. In this embodiment, the bottom plate 240 of the first housing portion 240A is configured by a part of the bottom plate 250 of the second housing portion 250A. That is, the bottom plate 240 of the first housing portion 240A is made of a light blocking material.

In the first housing portion 140A of the first embodiment, the plate members surrounding the periphery are all made of light-reflective resin, but in the first housing portion 240A of the present embodiment, wall plates 141, 142, and 143 made of light-reflective resin are used. , 144 and a bottom plate 240 made of black resin.

As a method for manufacturing the case 40A of the present embodiment, for example, a single bottom plate made of black resin is prepared, and the wall plates 141, 142, 143, and 144 are formed at positions corresponding to the first housing portion 240A. 140 A of 1st accommodating parts are formed by this. After that, the case 40A having the first housing portion 240A and the second housing portion 250A is manufactured by molding the wall plates 151, 152, 153, and 154 at positions corresponding to the second housing portions 250A.

According to the case 40A of the present embodiment, the light emitted from the light emitting unit portion 11 can be efficiently reflected in the first accommodating portion 240A, and the external light can be absorbed in the second accommodating portion 250A. Accordingly, in the detection device 203 of the present embodiment as well, the light utilization efficiency of the light emitting unit section 11 can be enhanced and the detection accuracy of the light receiving unit section 12 can be enhanced.

In addition, in the case of the present embodiment, unlike the configuration of the first embodiment, the bottom plate of the first housing portion 240A does not have light reflectivity, but the amount of light reflected from the bottom plate and entering the living body is very small. The effect on the light utilization efficiency of the light emitting unit section 11 is small.

(Third embodiment)
Next, a detection device according to a third embodiment will be described. The detection device of this embodiment differs from that of the first embodiment in the configuration of the cover member. Hereinafter, the same reference numerals are given to the same configurations and members as in the first embodiment, and the reference numerals for details are omitted.

FIG. 9A is a cross-sectional view showing the configuration of the detection device of this embodiment. FIG. 8B is a plan view showing the configuration of the detection device of this embodiment. 9A is a diagram corresponding to FIG. 4 of the first embodiment, and FIG. 9B is a diagram corresponding to FIG. 3 of the first embodiment.
As shown in FIGS. 9A and 9B, the detection device 303 of this embodiment includes a light-emitting unit section 11, a light-receiving unit section 12, a case 40B, and a sealing layer . The case 40</b>B of the present embodiment has a first accommodation portion 340</b>A that accommodates the light emitting unit portion 11 , a second accommodation portion 350</b>A that accommodates the light receiving unit portion 12 , and a partition wall 349 .

The second housing portion 350A includes a bottom plate (second bottom plate) 350 and a plurality of wall plates (second wall plates) 351 , 352 , 353 , 354 , and 355 protruding from the bottom plate 350 . The bottom plate 350 of this embodiment constitutes the entire bottom plate of the case 40B. The bottom plate 350 and the wall plates 351, 352, 353, 354, 355 are made of black resin.

The wall plate 351 is a plate-shaped member that protrudes from the bottom plate 350 toward the +Z side and extends in the Y-axis direction so as to partition the first housing portion 340A and the second housing portion 350A in the X direction. The wall plate 352 is a plate-like member that protrudes from the −X side peripheral edge of the bottom plate 350 toward the +Z side and extends in the Y-axis direction. The wall plate 353 is a plate-shaped member that protrudes from the +X side edge of the bottom plate 350 toward the +Z side and extends in the Y-axis direction. The wall plates 352 and 353 are provided on the bottom plate 350 so as to face the wall plate 351 in the direction along the X-axis.

The wall plates 354 and 355 are arranged side by side in a direction along the Y-axis that intersects (perpendicularly) with the X-axis. The wall plate 354 is provided on the +Y side of the wall plates 351 , 352 and 353 . The wall plate 354 is a flat plate-shaped member that protrudes from the +Y side peripheral edge of the bottom plate 350 toward the +Z side and extends in the X-axis direction.
The wall plate 355 is provided on the −Y side of the wall plates 351 , 352 and 353 . The wall plate 355 is a plate-shaped member that protrudes from the −Y side peripheral edge of the bottom plate 350 toward the +Z side and extends in the X-axis direction. The wall plate 355 is provided on the bottom plate 350 so as to face the wall plate 354 in the direction along the Y axis.

In this embodiment, the light-emitting unit portion 11 is provided in a partitioned area 360 partitioned by part of the bottom plate 350 and the wall plates 351, 352, 354, 355 of the second accommodation portion 350A. Specifically, the partitioned area 360 is surrounded by the wall plates 351 and 352, the portions of the wall plates 354 and 355 on the -X side of the wall plate 351, and the wall plates 351, 352, 354 and 355 of the bottom plate 350. consists of a part and

The first housing portion 340A includes a bottom plate (first bottom plate) 340 and a plurality of wall plates (first wall plates) 341 , 342 , 343 , and 344 . The bottom plate 340 is formed in a portion of the bottom plate 350 that defines the partition area 360 . The wall plates 341 , 342 , 343 and 344 are formed in portions of the wall plates 351 , 352 , 354 and 355 that partition the partitioned area 360 .
The wall plate 341 is formed on the wall plate 351, the wall plate 342 is formed on the wall plate 352, the wall plate 343 is formed on a portion of the wall plate 354, and the wall plate 344 is formed on a portion of the wall plate 355. .

That is, the first accommodation portion 340A of the present embodiment is configured using the partitioned area 360 formed in the second accommodation portion 350A. The bottom plate 340 and each of the wall plates 341, 342, 343, 344 are made of a light reflective material. In the case of this embodiment, a light reflective resin is used as the light reflective material.

The partition wall 349 of this embodiment includes one wall plate 341 facing the second housing portion 350A in the first housing portion 340A and one wall plate facing the first housing portion 340A in the second housing portion 350A. 351 and .

As described above, the case 40B of the present embodiment employs a configuration in which the light-shielding resin that constitutes the second housing portion 350A is mainly used, and the light-reflecting resin is partially formed in the position corresponding to the first housing portion 340A. .

For the case 40B of the present embodiment, for example, after forming the second housing portion 350A made of black resin using a predetermined mold, a light reflective resin is applied to a position corresponding to the partition region 360 to form the first housing portion 350A. Forming the accommodating portion 340A facilitates manufacture.

In addition, the manufacturing method of the case 40B is not limited to the above. For example, using insert molding, the case 40B is manufactured by filling a black resin so as to wrap the constituent members (the bottom plate 340 and the wall plates 341, 342, 343, 344) of the first housing portion 340A made of metal members. good too. By using such insert molding, the man-hours of the assembly process can be reduced.

According to the case 40B of the present embodiment, the light emitted from the light emitting unit portion 11 can be efficiently reflected in the first accommodation portion 340A, and the external light can be absorbed in the second accommodation portion 350A. As a result, in the detection device 303 of the present embodiment as well, the light utilization efficiency of the light emitting unit section 11 can be increased and the detection accuracy of the light receiving unit section 12 can be increased.

(Fourth embodiment)
Next, a detection device according to a fourth embodiment will be described. The detection device of this embodiment differs from that of the first embodiment in the configuration of the cover member. Hereinafter, the same reference numerals are given to the same configurations and members as in the first embodiment, and the reference numerals for details are omitted.

FIG. 10A is a cross-sectional view showing the configuration of the detection device of this embodiment. FIG. 10B is a plan view showing the configuration of the detection device of this embodiment. 10A is a diagram corresponding to FIG. 4 of the first embodiment, and FIG. 10B is a diagram corresponding to FIG. 3 of the first embodiment.
As shown in FIGS. 10A and 10B, the detection device 403 of this embodiment includes a light-emitting unit section 11, a light-receiving unit section 12, a case 40C, and a sealing layer . The case 40</b>C of this embodiment has a first accommodation portion 440</b>A that accommodates the light emitting unit portion 11 , a second accommodation portion 450</b>A that accommodates the light receiving unit portion 12 , and a partition wall 449 .

The first housing portion 440A includes a rectangular bottom plate (first bottom plate) 440, a plurality of wall plates 442, 443, and 444 protruding from the bottom plate 440, and a partition wall 449. In the case of this embodiment, the first housing portion 440A is partitioned by a bottom plate 440, wall plates 442, 443, and 444, and a partition wall 449. As shown in FIG. In this embodiment, the bottom plate 440 and the plurality of wall plates 442, 443, 444 are made of light reflective resin.

The second housing portion 450A includes a bottom plate (second bottom plate) 550 and a plurality of wall plates (second wall plates) 551 , 553 , 554 , 555 protruding from the bottom plate 550 . In the case of this embodiment, the second housing portion 450A is partitioned by a bottom plate 550 and wall plates 551, 553, 554, and 555. As shown in FIG. In this embodiment, the bottom plate 550 and the plurality of wall plates 551, 553, 554, 555 are made of a black resin having a light shielding property.

In this embodiment, the partition wall 449 is composed of one wall plate 551 among the wall plates 551, 553, 554, and 555 that faces the first accommodating portion 540A.

For the case 40C of the present embodiment, for example, after the second housing portion 550A is resin-molded using a predetermined mold, the constituent members (the bottom plate 440 and the wall plates 442, 443, 444) of the first housing portion 540A are sequentially assembled. It can be manufactured by molding.

According to the case 40C of the present embodiment, the light emitted from the light emitting unit portion 11 can be efficiently reflected in the first accommodating portion 540A, and the external light can be absorbed in the second accommodating portion 550A. Accordingly, in the detection device 403 of the present embodiment as well, the light utilization efficiency of the light-emitting unit section 11 can be enhanced and the detection accuracy of the light-receiving unit section 12 can be enhanced.

Further, in the case 40C of the present embodiment, the partition wall 449 is made of a single material, so that the thickness of the partition wall 449 can be processed with higher accuracy than when the partition wall is made of two materials. As a result, the positional accuracy between the light-emitting unit portion 11 and the light-receiving unit portion 12 and the partition wall 449 is enhanced, so that the detection accuracy can be further enhanced.

In addition, in the case of the present embodiment, unlike the configuration of the first embodiment, the partition wall 449 side of the first accommodating portion 440A does not have light reflectivity, but the light reflected from the partition wall 449 side and incident on the living body is Since it is a component that is difficult to effectively use as detection light because it is directed to the side opposite to the light receiving unit section 12 , the effect on the light utilization efficiency of the light emitting unit section 11 is small.

(Fifth embodiment)
Next, a detection device according to a fifth embodiment will be described. The detection device of this embodiment differs from that of the fourth embodiment in the configuration of the first accommodating portion. Hereinafter, the same reference numerals are given to the same configurations and members as in the fourth embodiment, and the reference numerals for details are omitted.

FIG. 11A is a cross-sectional view showing the configuration of the detection device of this embodiment. FIG. 11B is a plan view showing the configuration of the detection device of this embodiment.
As shown in FIGS. 11A and 11B, the detection device 503 of this embodiment includes a light-emitting unit section 11, a light-receiving unit section 12, a case 40D, and a sealing layer . The case 40</b>D of this embodiment has a first accommodation portion 540</b>A that accommodates the light emitting unit portion 11 , a second accommodation portion 550</b>A that accommodates the light receiving unit portion 12 , and a partition wall 549 .

The first housing portion 540A includes a rectangular bottom plate (first bottom plate) 540, a plurality of wall plates 442, 443, and 444 protruding from the bottom plate 540, and a partition wall 449.

The second housing portion 550A includes a bottom plate (second bottom plate) 650 and a plurality of wall plates 551, 553, 554, 555 protruding from the bottom plate 650. As shown in FIG. The bottom plate 650 constitutes the entire bottom plate of the case 40D. In this embodiment, the bottom plate 540 of the first housing portion 540A is configured by a part of the bottom plate 550 of the second housing portion 550A. That is, the bottom plate 540 of the first accommodating portion 540A is made of black resin.

In this embodiment, the partition wall 549 is composed of one wall plate 551 among the wall plates 551, 553, 554, and 555 facing the first accommodating portion 440A.

For the case 40D of the present embodiment, for example, after the second housing portion 550A is molded using a predetermined mold, the constituent members (wall plates 442, 443, 444) of the first housing portion 540A are formed by molding or injection molding. It is possible to manufacture easily by sequentially forming by

According to the case 40D of the present embodiment, the light emitted from the light emitting unit portion 11 can be efficiently reflected in the first accommodating portion 540A, and the external light can be absorbed in the second accommodating portion 550A. As a result, in the detection device 503 of the present embodiment as well, the light utilization efficiency of the light-emitting unit section 11 can be enhanced and the detection accuracy of the light-receiving unit section 12 can be enhanced.

Also in the case 40D of the present embodiment, the partition wall 549 is made of a single material, so that the thickness of the partition wall 549 can be processed with high accuracy. As a result, the positional accuracy between the light-emitting unit portion 11 and the light-receiving unit portion 12 and the partition wall 549 is increased, so that the detection accuracy can be further increased.

In addition, in the case of the present embodiment, unlike the configuration of the fourth embodiment, the bottom plate of the first housing portion 540A does not have light reflectivity, but the amount of light reflected from the bottom plate and entering the living body is very small. The effect on the light utilization efficiency of the light emitting unit section 11 is small.

Although the present invention has been described above based on the above-described embodiments, the present invention is not limited to the above-described embodiments, and can be implemented in various aspects without departing from the scope of the invention.
For example, in the above embodiments, a human being was exemplified as a living body, but the present invention can also be applied to measurement of biological information (for example, pulse) of other animals.

Further, in the measuring device 100 of the above-described embodiment, the case where the detecting device 3 is provided inside the housing part 1 is taken as an example, but the installation location of the detecting device 3 is not limited to this. It may be In addition, it may be installed on a wireless mouse, a doorknob sensor, a steering wheel of an automobile, or the like, which is touched by a person during use.

In addition, as the measuring device 100 of the above-described embodiment, a configuration of a wristwatch type (smart watch) has been exemplified, but for example, a configuration that is worn on the subject's body such as a pulse oximeter, or a configuration that is attached to the subject's neck as a necklace type. The present invention can be applied to a structure to be worn, a structure to be attached to the body of the subject as a sticker type, and a structure to be mounted on the head of the subject as a head-mounted display type.

Further, in the above embodiment, the case where the band-pass filter 122 is provided only in the first light receiving element 51 is taken as an example. A bandpass filter may be provided.

Further, in the above embodiment, the case where each of the light emitting elements 50, 60, and 70 is caused to emit light in a time division manner was taken as an example. Therefore, the first light-emitting element 50 may be turned on all the time instead of in a time-sharing manner.

A detection device of one embodiment of the present invention may have the following configuration.
A detection device according to one aspect of the present invention includes a light-emitting unit that emits light to a living body, a light-receiving unit that receives light from the living body, and a case that houses the light-emitting unit and the light-receiving unit. , a second housing portion housing the light receiving portion, and a partition wall separating the first housing portion and the second housing portion, the first housing portion supporting the light emitting portion and a plurality of first wall plates projecting from the first bottom plate. a plate, wherein at least one of the plurality of first wall plates is made of a light reflective material, and the second bottom plate and the plurality of second wall plates are made of a light blocking material.

In one aspect of the detection device of the present invention, the plurality of first wall plates and the first bottom plate may be configured with a light reflective material.

In one aspect of the detection device of the present invention, the first bottom plate may be a part of the second bottom plate, and the plurality of first wall plates may be made of a light-reflecting material.

In the detection device according to one aspect of the present invention, the partition wall includes one wall plate of the plurality of first wall plates that faces the second housing portion, and one of the plurality of second wall plates that faces the first housing portion. It is good also as a structure comprised with one wall plate which carries out.

In the detection device according to one aspect of the present invention, the light emitting section is provided in a partitioned area partitioned by a portion of the plurality of second wall plates and a portion of the second bottom plate, and the first bottom plate is located on the second bottom plate. Of the plurality of second wall plates, the plurality of first wall plates may be formed in portions that partition the partitioned regions.

In the detection device according to one aspect of the present invention, the partition wall is composed of one wall plate of the plurality of second wall plates facing the first housing portion, and the first bottom plate and the plurality of first wall plates At least one of the wall plates facing the partition wall may be made of a light reflective material.

In the detection device according to one aspect of the present invention, the partition wall is composed of one of the plurality of second wall plates facing the first container, and the first bottom plate is a part of the second bottom plate. Of the plurality of first wall plates, at least one wall plate facing the partition wall may be made of a light reflective material.

In the detection device according to one aspect of the present invention, the light emitting unit includes a first light emitting element that emits a first light having a green wavelength band, and a second light emitting element that emits a second light having a wavelength band longer than the green wavelength band. a light-emitting element, the light-receiving unit includes a first light-receiving element that receives the first light from the living body, and a second light-receiving element that receives the second light from the living body, and the first light-emitting element and the second light-receiving element When the direction in which the two light emitting elements are arranged is defined as a first direction and the direction crossing the first direction is defined as a second direction, the first light receiving element is provided closer to the light emitting part than the second light receiving element in the second direction. It may be configured as

In one aspect of the detection device of the present invention, the light emitting unit further includes a third light emitting element that emits third light having a longer wavelength band than the second light, and the third light from the living body is received by the second light receiving device. The light may be received by the element.

A detection device of one embodiment of the present invention may have the following configuration.
A detection device according to one aspect of the present invention includes a light-receiving section that receives light from a living body, and a case that houses the light-emitting section and the light-receiving section. and a partition wall that separates the first and second accommodation portions, and the first accommodation portion is made of a light reflective material that reflects the light from the light emitting portion. and the second accommodating portion has an angle limiting filter that limits the incident angle of the light to the light receiving portion.

The measuring device of one embodiment of the present invention may have the following configuration.
A measuring device according to one aspect of the present invention includes the detecting device according to the aspect described above, and an information analyzing section that specifies biological information from a detection signal indicating a detection result of the detecting device.

3, 203, 303, 403, 503... Detecting device 5... Control device (information analysis section) 11... Light emitting unit section (light emitting section) 12... Light receiving unit section (light receiving section) 40, 40A, 40B, 40C , 40D... case, 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, 140, 240, 340 , 440, 540... Bottom plate (first bottom plate), 140A, 240A, 340A, 440A, 540A... First accommodation portion, 150A, 250A, 350A, 450A, 550A... Second accommodation portion, 141, 142, 143, 144, wall plate Partition wall 250, 350, 550, 650 Bottom plate (second bottom plate) 360 Partitioned area 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 signals.

Claims (11)

a light emitting unit that emits light to a living body;
a light receiving unit that receives the light from the living body;
and a case that houses the light emitting unit and the light receiving unit,
The case has a first accommodation portion that accommodates the light emitting portion, a second accommodation portion that accommodates the light receiving portion, and a partition wall that partitions the first accommodation portion and the second accommodation portion,
The first housing portion includes a first bottom plate that supports the light emitting portion, and a plurality of first wall plates that protrude from the first bottom plate,
The second housing portion includes a second bottom plate that supports the light receiving portion, and a plurality of second wall plates that protrude from the second bottom plate,
At least one of the plurality of first wall plates is made of a light reflective material,
The second bottom plate and the plurality of second wall plates are made of a light-shielding material,
detection device. wherein the plurality of first wall plates and the first bottom plate are composed of the light reflective material;
A detection device according to claim 1 . The first bottom plate is composed of a part of the second bottom plate,
wherein the plurality of first wall plates are made of the light reflective material;
A detection device according to claim 1 . The partition wall includes one wall plate of the plurality of first wall plates facing the second housing portion and one wall plate of the plurality of second wall plates facing the first housing portion. , consisting of
4. A detection device according to claim 2 or 3. The light emitting unit is provided in a partitioned area partitioned by a portion of the plurality of second wall plates and a portion of the second bottom plate,
The first bottom plate is formed in a portion of the second bottom plate that partitions the partitioned area,
The plurality of first wall plates are formed in portions of the plurality of second wall plates that partition the partitioned area,
A detection device according to claim 1 . The partition wall is composed of one wall plate of the plurality of second wall plates that faces the first housing portion,
The first bottom plate and at least one of the plurality of first wall plates facing the partition wall are made of the light reflective material,
A detection device according to claim 1 . The partition wall is composed of one wall plate of the plurality of second wall plates that faces the first housing portion,
The first bottom plate is composed of a part of the second bottom plate,
At least one of the plurality of first wall plates facing the partition wall is made of the light reflective material,
A detection device according to claim 1 . The light emitting unit includes a first light emitting element that emits a first light having a green wavelength band and a second light emitting element that emits a second light having a longer wavelength band than the green wavelength band,
The light receiving unit includes a first light receiving element that receives the first light from the living body and a second light receiving element that receives the second light 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 a first direction, and the direction crossing 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,
8. A detection device according to any one of claims 1 to 7. The light emitting unit further includes a third light emitting element that emits third light having a longer wavelength band than the second light,
the third light from the living body is received by the second light receiving element;
9. A detection device according to claim 8. a light-emitting unit that emits light to a living body;
a light receiving unit that receives light from the living body;
and a case that houses the light emitting unit and the light receiving unit,
The case has a first accommodation portion that accommodates the light emitting portion, a second accommodation portion that accommodates the light receiving portion, and a partition wall that partitions the first accommodation portion and the second accommodation portion,
The first housing portion is made of a light reflective material that reflects light from the light emitting portion,
The second housing section has an angle limiting filter that limits the incident angle of light to the light receiving section.
detection device. a detection device according to any one of claims 1 to 10;
an information analysis unit that identifies biological information from a detection signal indicating a detection result by the detection device;
measuring device.

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