WO2019095093A1 - 光电检测装置、传感器及智能设备 - Google Patents

光电检测装置、传感器及智能设备 Download PDF

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Publication number
WO2019095093A1
WO2019095093A1 PCT/CN2017/110802 CN2017110802W WO2019095093A1 WO 2019095093 A1 WO2019095093 A1 WO 2019095093A1 CN 2017110802 W CN2017110802 W CN 2017110802W WO 2019095093 A1 WO2019095093 A1 WO 2019095093A1
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WIPO (PCT)
Prior art keywords
light
spacer
light emitter
emitter
receiver
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Application number
PCT/CN2017/110802
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English (en)
French (fr)
Inventor
刘致尧
杨旺旺
刘畅
段红亮
Original Assignee
深圳市汇顶科技股份有限公司
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Publication date
Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to PCT/CN2017/110802 priority Critical patent/WO2019095093A1/zh
Priority to CN201790000286.0U priority patent/CN209911939U/zh
Publication of WO2019095093A1 publication Critical patent/WO2019095093A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means

Definitions

  • the embodiments of the present invention relate to the field of photoelectric detection technologies, and in particular, to a photoelectric detecting device, a sensor, and a smart device.
  • the photodetection device is a detection device in which a photoelectric element converts an optical signal into an electrical signal by utilizing a change in illumination to cause an electrical parameter change.
  • the reflective photoelectric detecting device further utilizes the principle of light reflection to project light emitted from the light source onto the object to be measured, and is reflected by the object to be measured and then projected onto a photoelectric receiving element, such as a photodetector, thereby realizing detection of the object to be tested. .
  • a volume measurement of a human body to photoplethysmography is optically obtained to determine the heart rate of the subject. Since the pressure pulse from each heart cycle of the heart causes a change in the volume of the blood, the volume change affects the change in light absorption in the skin, when the skin is illuminated by a light source such as a light-emitting diode (LED), reflected back by the photodetector
  • the heart rate detection can be realized by processing the information carried in the light.
  • the light traveling through the shallow path carries little effective information after being reflected from the object to be measured, and the useless information is more, thereby affecting the accuracy of the reflective photoelectric detecting device for determining the biological index or the physiological index of the measured object.
  • the embodiment of the present application provides a photoelectric detecting device, a sensor, and a smart device, so as to improve the accuracy of the reflective photoelectric detecting device to determine the biological index or the physiological index of the measured object.
  • a photodetecting device includes: a light emitter, a light receiver, a light emitter disposed between the light emitter and the light receiver for blocking a light emitter to be emitted The light is directed toward the spacer of the light receiver; wherein the light emitter is located adjacent to the spacer such that the distance between the light emitter and the spacer is higher than the spacer The ratio between degrees is less than or equal to the set value.
  • the spacer is disposed on the sidewall of the light emitter with a light reflecting layer for reflecting light.
  • the spacer is concave toward the light emitter side.
  • the spacer has a trapezoidal cross section, wherein a width of the spacer near a side of the light emitter is greater than a width away from a side of the light emitter.
  • the spacer is an opaque bony, and/or the spacer is provided with a light absorbing layer for absorbing light toward a sidewall of the light emitter.
  • the photodetecting device is further provided with a first light guiding component located above the light emitter for guiding the light emitted by the light emitter to the object to be tested.
  • the photodetecting device is further provided with a second light guiding component located above the light receiver for guiding light reflected from the object to be measured to the light receiver.
  • the light emitter and the light receiver are both disposed on a substrate; the light emitter, the light receiver, the spacer, and the substrate are all located in a metal casing; a spacer divides a space enclosed by the metal casing and the substrate into two cavities, the light emitter is located in one of the cavities, and the light receiver is located in another cavity; the light The bottom area of the cavity in which the emitter is located is smaller than the bottom area of the cavity in which the light receiver is located.
  • the light emitter is located in a left side cavity of the two cavities, and a distance of the light emitter to the spacer is smaller than a distance from the spacer to a left side shell of the metal case Half the distance of the body.
  • the distance from the light emitter to the spacer is greater than or equal to 0.2 millimeters.
  • the metal housing is connected to a ground end of the substrate.
  • the light emitter and the light receiver are respectively located in different housings; a side of the housing in which the light emitter is located is disposed near a side of the housing where the light receiver is located.
  • a side of the housing in which the light receiver is located adjacent to the housing where the light emitter is located is also provided with a spacer.
  • a sensor comprising the photodetecting device of any of the above.
  • a smart device comprising: a sensor as described above.
  • the light emitter is disposed close to the spacer such that the ratio between the distance between the light emitter and the spacer and the height of the spacer is less than or equal to a set value.
  • the light emitter is disposed close to the spacer, and a part of the light emitted by the light emitter, especially the light passing through the shallow path of the skin, is absorbed or redirected by the spacer. Therefore, when the biological indicator or the physiological index is detected, the amount of light passing through the shallow path of the skin can be reduced, and the amount of light of the shallow path of the reflected skin is also reduced, thereby reducing unnecessary information in the reflected light as a whole.
  • the effective information ratio increases the signal to noise ratio.
  • the accuracy of detecting the biological indicator or the physiological index of the measured object by the reflective photoelectric detecting device is improved.
  • the increase of the signal-to-noise ratio also improves the efficiency of signal processing, reduces the burden of unnecessary information processing, and reduces the power consumption of the device.
  • FIG. 1 is a schematic structural view of a photodetecting device according to Embodiment 1 of the present application.
  • FIG. 2 is a schematic structural diagram of a photodetecting device according to Embodiment 2 of the present application.
  • Figure 3 is a plan view of the photodetecting device shown in Figure 2;
  • Figure 4 is a front elevational view of the photodetecting device of Figure 2;
  • FIG. 5 is a schematic structural diagram of another photodetecting device according to Embodiment 2 of the present application.
  • FIG. 6 is a schematic structural diagram of a photodetecting device according to Embodiment 3 of the present application.
  • FIG. 7 is a schematic structural diagram of another photodetecting device according to Embodiment 3 of the present application.
  • FIG. 8 is a schematic structural diagram of still another photoelectric detecting device according to Embodiment 3 of the present application.
  • FIG. 9 is a schematic structural diagram of still another photodetecting device according to Embodiment 3 of the present application.
  • FIG. 1 a schematic structural diagram of a photodetecting device according to a first embodiment of the present application is shown.
  • the photodetecting device of the present embodiment includes: a light emitter 102, a light receiver 104, and a light disposed between the light emitter 102 and the light receiver 104 for blocking the light emitted by the light emitter 102 from directly hitting the light receiver 104.
  • Isolation member 106 wherein, the light emitter 102 is located adjacent to the spacer 106 such that the ratio between the distance L between the light emitter 102 and the spacer 106 and the height H of the spacer 106 is less than or equal to a set value.
  • the height of the spacer 106 is determined.
  • the ratio between the distance between 106 and the height of the spacer 106 is smaller. Based on this, a set value may be set in advance such that the ratio is smaller than the set value, so that the spacer can absorb or light part of the light emitted by the light emitter 102, especially the light traveling through the shallow path of the skin. Orientation.
  • the spacer may be located on a carrier, such as on a substrate, the carrier and the spacer and a device covering the light emitter, such as a housing, enclose a cavity in which the light emitter is located, and It is conventionally placed at the bottom centerline position of the cavity.
  • a carrier such as on a substrate
  • the carrier and the spacer and a device covering the light emitter such as a housing
  • the light emitter 102 is placed close to the spacer 106, as shown in FIG. 1 on the right side of the bottom center line (shown by a dotted line in FIG.
  • the set value when the set value is set, if the ratio of the distance between the light emitter and the spacer and the height of the spacer is referenced when the light emitter is located at the bottom center line, the set value should be smaller than the ratio.
  • the present invention is not limited thereto. In practical applications, the set value may also be appropriately set by a person skilled in the art based on experience or experimental results.
  • the light emitter 102 is used to generate incident light.
  • the light emitter 102 can be implemented by any suitable device, including but not limited to a light emitting diode LED, and the LED can include one or more (two or more).
  • the incident light may be visible light, such as green, blue, red light, or other invisible portions of the electromagnetic spectrum, such as infrared light, and the like.
  • the spacer 106 can be implemented in any suitable manner, such as using an opaque material or a surface spray
  • the lacquer or the like has absorbance because it is opaque.
  • the spacer 106 can absorb some or all of the light that is originally in the shallow path of the skin, thereby reducing the shallowness of the skin.
  • the amount of light in the layer path reduces the useless information in the reflected light as a whole, improves the effective information ratio, and increases the signal-to-noise ratio.
  • the spacer 106 may be disposed to have a property of reflecting light, for example, coating the spacer 106.
  • some or all of the light that originally traveled the shallow path of the skin is reflected by the spacer 106. It is incident on the skin, which increases the amount of light walking through the deep path, reduces the amount of light that travels through the shallow path of the skin, and reduces the amount of light in the shallow path of the reflected skin, thereby reducing the useless information in the reflected light as a whole and improving the use.
  • the proportion of effective information increases the signal to noise ratio.
  • the spacer 106 can also have light absorption and light reflectivity at the same time.
  • the spacer 106 is partially coated, so that the portion of the coating can reflect light, and the uncoated portion can absorb light, which can also reduce the shallowness of the skin.
  • the amount of light in the layer path also reduces the amount of light in the shallow path of the reflected skin, thereby reducing the useless information in the reflected light as a whole, increasing the effective information ratio and increasing the signal to noise ratio.
  • the accuracy of the reflective photoelectric detecting device for determining the biological index or the physiological index of the measured object can be improved; and the efficiency of signal processing is improved, the burden of unnecessary information processing is reduced, and the power consumption of the device is reduced.
  • the light receiver 104 is configured to receive reflected light reflected from the object under test, which may be implemented by any suitable device by those skilled in the art including, but not limited to, an optical sensor.
  • the light emitter is disposed close to the spacer such that the ratio between the distance between the light emitter and the spacer and the height of the spacer is less than or equal to a set value.
  • the light emitter is disposed close to the spacer, and a part of the light emitted by the light emitter, especially the light passing through the shallow path of the skin, is absorbed or redirected by the spacer. Therefore, when the biological indicator or the physiological index is detected, the amount of light passing through the shallow path of the skin can be reduced, and the amount of light of the shallow path of the reflected skin is also reduced, thereby reducing unnecessary information in the reflected light as a whole. Increased the effective information ratio and increased the signal to noise ratio.
  • the accuracy of detecting the biological indicator or the physiological index of the measured object by the reflective photoelectric detecting device is improved.
  • the increase of the signal-to-noise ratio also improves the efficiency of signal processing, reduces the burden of unnecessary information processing, and reduces the power consumption of the device.
  • the reflective photoelectric detecting device of the embodiment can improve the accuracy of detecting and determining the biological index or the physiological index of the measured object by improving the position of the light emitter, and increasing the amount by Compared with the scheme of changing the incident light path, the implementation method is simple and the implementation cost is low.
  • the spacer in the reflective photodetection device has light absorbing properties.
  • FIG. 2 is a schematic structural diagram of a reflective photodetection device in an embodiment of the present application.
  • the reflective photodetection device is provided with a light emitter 202, a light receiver 204, and is disposed on the light emitter 202 and the light receiver. Light between the 204 for blocking the light emitted by the light emitter 202 is directed toward the spacer 205 of the light receiver 204.
  • the light emitter 202 is disposed adjacent to the spacer 205 such that the ratio between the distance between the light emitter 202 and the spacer 205 and the height of the spacer 205 is less than or equal to Set value.
  • Set value For the specific setting of the set value, refer to the description in the first embodiment, and details are not described herein again.
  • the spacer 205 may be an opaque bone, and/or the spacer 205 is provided with a light absorbing layer for absorbing light toward the sidewall of the light emitter 202. Thereby, the spacer 205 in the present embodiment is made to have light absorbing properties.
  • a light emitting chamber 201 and a light receiving chamber 203 are further provided.
  • the light emitter 202 is located in the light emitting chamber 201
  • the light receiver is located in the light receiving chamber 203.
  • it is not limited to the cavity form of the light emitting chamber 201 and the light receiving chamber 203, and other suitable forms are also applicable, such as covering the light emitter 202 and the light receiver 204,
  • the light emitter 202 and the light receiver 204 are located in a space formed by the film, and the like.
  • the light emitter 202 and the light receiver 204 are disposed on the substrate 206 as an example, but are not limited thereto, and other suitable carriers are also applicable to the solution of the embodiment of the present invention.
  • the space where the light emitting chamber 201 is located may be constituted by a related device, for example, a bottom portion of the substrate where the light emitter 202 is located, a side wall formed by the spacer 205, and other side walls formed by other arrangements or housings, and the light guiding assembly Make up the top, and so on.
  • the light emitter 202 is disposed in the light emitting chamber 201 and disposed adjacent to the spacer 205.
  • the ratio between the distance of the light emitter 202 to the spacer 205 and the height of the spacer 205 is less than or equal to the set value.
  • the space in which the light receiving chamber 203 is located may be constituted by a related device, for example, a bottom portion of the substrate in which the light receiver 204 is located, a side wall formed by the spacer 205, and other side walls formed by other arrangements or housings, and the light guiding member Make up the top, and so on.
  • the light receiver 204 is disposed in the light receiving room 203.
  • the reflective photodetection device further includes a housing, which may be a metal housing 207.
  • the light emitter 202, the light receiver 204, the spacer 205, and the substrate 206 are all located in the metal housing 207.
  • the spacer 205 divides the space enclosed by the metal casing 207 and the substrate 206 into two cavities, such as the light emitting chamber 201 and the light receiving chamber 203 in this embodiment.
  • the light emitter 202 is located in one of the cavities, such as the light emitting chamber 201 in this embodiment; the light receiver 204 is located in the other cavity, such as the light receiving chamber 203 in this embodiment; the cavity in which the light emitter 202 is located
  • the bottom area of the body is smaller than the bottom area of the cavity in which the light receiver 204 is located.
  • the bottom area of the light emitting chamber 201 is smaller than the bottom area of the light receiving chamber 203. It can be seen that, in FIG. 2, the space occupied by the light emitting chamber 201 is smaller than the space occupied by the light receiving chamber 203. .
  • the case where the bottom area of the cavity where the light emitter 202 is located is greater than or equal to the bottom area of the cavity where the light receiver 204 is located is also applicable to the solution provided by the embodiment of the present invention.
  • the light emitter is located in the left cavity of the two cavities, and the distance from the light emitter 202 to the spacer 205 is smaller than the distance from the spacer 205 to the left side of the metal casing 207.
  • Half the distance of the side casing; the light receiver is located in the right cavity of the two cavities.
  • the light emitter is located in the right cavity of the two cavities, and the photoreceiver is located in the left cavity of the two cavities.
  • FIG. 3 is a top plan view of the reflective photodetection device of FIG. 2, wherein the arrowless arrow in FIG. 3 shows the bottom center line of the light emitting chamber 201, and the light emitter 202 is located on the right side of the bottom center line of the light emitting chamber 201. That is, near the side of the spacer 205.
  • the light emitter 202 can be placed in close proximity to the spacer 205, leaving only process tolerances such as 0.2 mm.
  • the distance between the light emitter 202 and the spacer 205 may be greater than 0.2 mm, and only the ratio of the distance between the light emitter 202 to the spacer 205 and the height of the spacer 205 is less than or It is equal to the set value.
  • FIG. 4 is a front elevational view of the reflective photodetection device of FIG. 2.
  • the light emitter 202 is biased toward the spacer 205, and the light emitted by the light emitter 202 to the spacer 205 is separated by the spacer 205. absorb.
  • the light emitter 202 is located in the left cavity of the two cavities, and the distance d1 of the light emitter 202 to the spacer 205 is less than half the distance d21 of the distance d2 of the spacer 205 to the left side case of the metal case 207; light receiving The device 204 is located in the right cavity of the two cavities.
  • the incident light emitted by the light emitter 202 is divided into three parts, Wherein, the light in the vertical line region travels the deep path, the light in the horizontal line region travels the shallow path, and the light in the oblique region is a portion of the light of the original shallow path, but the portion is absorbed by the light absorbing spacer 205, No longer projecting to the skin area, so that the amount of light passing through the shallow path is reduced, and the reflected light reflected by the part of the light is also reduced, so that the light of the deep path in the total amount of light reflects more light, and the carrying is effective. Information accounts for more and increases the signal-to-noise ratio.
  • the reflective photodetecting device can employ a plurality of light emitters, as shown in FIG. 3, and the plurality of light emitters can be as a plurality of LEDs. Accordingly, a plurality of optical receivers can also be employed. As shown in FIG. 3, the plurality of optical receivers can be, for example, a plurality of PDs (Photo Detectors). When the LED is placed, it is placed close to the spacer 205.
  • PDs Photo Detectors
  • the spacer 205 is an opaque bony and/or the spacer 205 is disposed on the side wall of the light emitter 202 with a light absorbing layer for absorbing light, so when the LED is close to the isolation When the member 205 is placed, the light traveling through the shallow path will be absorbed by the spacer 205, and the shallow path light received on the PD is reduced, and the effective signal is increased, thereby improving the signal-to-noise ratio.
  • the spacer 205 is not limited to the planar shape of the plane shown in FIG. 2 to FIG. 4, and may also adopt a trapezoidal, regular or irregular curved shape, or other suitable shape to change the light illuminating thereon.
  • the path so that the light illuminating it is absorbed, does not allow it to enter the skin, and reduces the amount of light that travels through the shallow path.
  • FIG. 5 Another possible reflective photoelectric detecting device is shown in FIG. 5.
  • the light emitting chamber 201 and the light receiving chamber 203 in FIG. 5 are independent of each other, that is, light.
  • Transmitter 202 and light receiver 204 are located in separate housings, respectively.
  • the substrate on which the light emitter 202 and the light receiver 204 are located may be different substrates, and a side of the housing in which the light emitter 202 is located is disposed near a side of the housing where the light receiver 204 is located.
  • a spacer may also be disposed on a side of the housing in which the light receiver 204 is located adjacent to the housing in which the light emitter 202 is located. That is, the spacer 205 (the scheme shown in FIG. 5) may be provided only in the light emitting chamber 201, but is not limited thereto, and the spacer 205 may also be provided in the light receiving chamber 203.
  • the reflective photoelectric detecting device shown in FIG. 5 adopts a separate structure of the light emitting chamber 201 and the light receiving chamber 203, and can be flexibly set according to the structure of the smart device, thereby improving the applicability of the reflective photoelectric detecting device and saving space.
  • the reflective photodetection device provided by the embodiment of the present invention is applicable not only to the scene of the LED and the PD discrete device, but also to the package scenario of integrating the PD and the LED in a single chip.
  • the reflective photodetecting device may further be disposed above the light emitter 202.
  • the first light guiding component for guiding the light emitted by the light emitter 202 to the object to be measured, and/or the reflective photoelectric detecting device is disposed above the light receiver 204 for guiding the object to be tested
  • the reflected light is directed toward the second light directing component of the light receiver 204.
  • the first light guiding component may protrude toward the object to be measured, and/or the second light guiding component may be recessed toward the direction of the light receiver.
  • a first light guiding member 208 is disposed at the top of the light emitting chamber 201 and is disposed to protrude toward the outside of the light emitting chamber 201 (ie, the direction of the object to be measured) to enhance the light projection effect; and/or,
  • the second light guiding member 209 is disposed at the top of the light receiving chamber 203 and is disposed to be recessed toward the inside of the light receiving chamber 203 (ie, the direction of the light receiver 204) to enhance the light receiving effect.
  • the light emitter 202 and the light receiver 204 may be disposed on the substrate 206; the light emitter 202, the light receiver 204, the spacer 205 and the substrate 206 are all located in the metal shell 207, and the metal shell 207 is connected to the ground of the substrate 206. Therefore, when the metal casing 207 contacts the object to be measured, such as a human body, the human body can be electrically connected to the ground, thereby reducing the noise influence of the human body on the PD.
  • the metal shell can adopt any suitable metal with better electrical conductivity.
  • the light emitter is disposed adjacent to the spacer such that the ratio between the distance between the light emitter and the spacer and the height of the spacer is less than or equal to a set value.
  • the spacer in the embodiment has light absorbing property, and the light emitter is disposed close to the spacer, and part of the light emitted by the light emitter, especially the light passing through the shallow path of the skin, is absorbed by the spacer. Therefore, when the biological indicator or the physiological index is detected, the amount of light passing through the shallow path of the skin can be reduced, and the amount of light of the shallow path of the reflected skin is also reduced, thereby reducing unnecessary information in the reflected light as a whole.
  • the effective information ratio increases the signal to noise ratio.
  • the accuracy of detecting the biological indicator or the physiological index of the measured object by the reflective photoelectric detecting device is improved.
  • the increase of the signal-to-noise ratio also improves the efficiency of signal processing, reduces the burden of unnecessary information processing, and reduces the power consumption of the device.
  • the reflective photodetection device of the present embodiment can improve the accuracy of detecting and determining the biological index or the physiological index of the measured object by improving the position of the light emitter, and the scheme of changing the incident light path by adding additional settings.
  • the implementation method is simple and the implementation cost is low.
  • the spacer in the reflective photodetecting device has light reflecting properties.
  • a feasible reflective photoelectric detecting device is shown in FIG. 6 and includes: a light emitting chamber 301, and a light emitting device.
  • the light emitter 302 is disposed in the light emitting chamber 301, the light receiver 304 is disposed in the light receiving chamber 303, and the spacer 305 is disposed between the light emitting chamber 301 and the light receiving chamber 303.
  • the light emitter 302 is disposed adjacent to the spacer 305 such that the ratio between the distance between the light emitter 302 and the spacer 305 and the height of the spacer 305 is less than or equal to a set value.
  • the distance from the light emitter 302 to the spacer 305 is equal to or greater than 0.2 mm.
  • the light emitter 302 and the light receiver 304 are disposed on the same substrate 306.
  • a first light guiding component for guiding the light emitted by the light emitter 302 to the object to be measured, such as the first light guiding component 308 disposed on the top of the light emitting chamber 301 in FIG. 6;
  • a second light guiding member for guiding light reflected from the object to be measured toward the light receiver 304, such as the second light guiding member 309 disposed at the top of the light receiving chamber 303 in FIG.
  • the light emitter 302, the light receiver 304, the spacer 305 and the substrate 306 are all located in the metal casing 307; the spacer 305 divides the space enclosed by the metal casing 307 and the substrate 306 into two cavities, and the light emitter 302 Located in one of the cavities, the photoreceiver 304 is located in the other cavity; the bottom area of the cavity in which the light emitter 302 is located is smaller than the bottom area of the cavity in which the photoreceiver 304 is located.
  • the reflective photodetection device forms a space through the metal casing 307, the substrate 306, the first light guiding component 308, and the second light guiding component 309, and the space is partitioned by the spacer 305 into a light emitting chamber 301 and a light receiving chamber 303.
  • the first light guiding component 308 and the second light guiding component 309 are disposed on the metal casing 307.
  • the spacer 305 divides the cavity surrounded by the metal case 307 and the substrate 306 into a light emitting chamber 301 and a light receiving chamber 303.
  • the bottom area of the light emitting chamber 301 is smaller than the bottom area of the light receiving chamber 303, that is, light.
  • the space occupied by the emission chamber 301 is smaller than the space occupied by the light receiving chamber 303.
  • the case where the bottom area of the cavity where the light emitter 202 is located is greater than or equal to the bottom area of the cavity where the light receiver 204 is located is also applicable to the solution provided by the embodiment of the present invention.
  • the light emitting chamber 301 is located on the left side
  • the light receiving chamber 303 is located on the right side
  • the light emitter 302 is located in the light emitting chamber 301 and disposed adjacent to the spacer 305
  • the light receiver 304 is located in the light receiving chamber 303.
  • the distance of the light emitter 302 to the spacer 305 is less than half the distance of the spacer 305 to the left side housing of the metal housing 307.
  • the distance from the light emitter 302 to the spacer 305 is greater than or equal to 0.2 mm.
  • the light emitter is located in the right cavity of the two cavities
  • the photoreceiver is located in the left cavity of the two cavities.
  • the spacer 305 is disposed on the sidewall of the light emitter 302 with a light reflecting layer for reflecting light.
  • the light reflecting layer may be implemented by any suitable means according to actual needs, including but not limited to reflective.
  • the coating is as shown in the coating 310 of Figure 6 (cross-line area in Figure 6).
  • the light emitter 302 is disposed adjacent to the spacer 305. Therefore, of the light emitted by the light emitter 302, the light incident on the spacer 305 is reflected by the spacer 305 and is incident on the incident surface, such as the first.
  • the light guiding component 308 is configured such that part or all of the light that originally traveled through the shallow path (such as the horizontal line area in FIG.
  • the spacer 305 is reflected by the spacer 305 and becomes the light that travels the deep path, and the light that originally travels the deep path (as shown in the figure).
  • the 6 vertical line areas are all projected together to the subcutaneous blood vessel portion of the skin.
  • the light path of the light reflected by the spacer 305 is as shown by the dotted arrow with an arrow in FIG. 6, and the light path of the light that originally traveled the deep path is shown by the solid curved line with an arrow in FIG.
  • the spacer 305 having the light reflecting layer may have a concave shape toward the side of the light emitter 302, and a cross section of the cross section perpendicular to the length direction of the spacer 305 is as shown in FIG. 7. Shown in .
  • the spacer 305 can adopt the same concave curvature as a whole, that is, the curvature of the cross section at any position of the spacer 305 is the same; the concave hole can also be disposed on the spacer 305, that is, the cross section is a gradient arc, and the more Near the other side of the spacer, the greater the curvature.
  • the reflective layer of another optional spacer 305 is as shown in Fig. 8, and its cross section perpendicular to the longitudinal direction of the spacer 305 is trapezoidal so that the incident light is projected deeper and better carried. information.
  • the width of the spacer 305 near the side of the light emitter 302 is greater than the width of the side away from the light emitter 302.
  • the trapezoidal spacer 305 may also be disposed in a concave shape toward the side of the light emitter 302 to further enhance the light reflection effect.
  • the spacer can be provided with a reflective property by a coating or a metal material (such as a metal material having a good surface polishing degree, such as gold, silver, copper, etc.).
  • a coating or a metal material such as a metal material having a good surface polishing degree, such as gold, silver, copper, etc.
  • the spacer 305 is not limited to the above-mentioned plane, trapezoidal or the like, and may also adopt a regular or irregular curved shape, or other suitable shape to change the light irradiated thereon.
  • the path causes the light that illuminates it to reflect, changing its path into the skin, and reducing the amount of light that travels through the shallow path.
  • the first light guiding component 308 may be disposed to protrude toward the object to be measured, as shown in FIG. 9 to enhance the light projection effect; and/or the second light guiding component 309 may be disposed to the light.
  • the direction of the receiver 304 is recessed as shown in FIG. 9 to enhance the light receiving effect. It should be noted that, in actual use, only the convex first light guiding component 308 or only the concave second light guiding component 309 may be used.
  • the light emitting chamber 301 and the light receiving chamber 303 in this embodiment can also be independent of each other.
  • the light emitter 302 is located in the first housing and the light receiver 304 is in the second housing, the first housing and the second housing being different housings.
  • the substrate on which the light emitter 302 and the light receiver 304 are located may be different substrates.
  • the spacer may be disposed only on the side of the housing in which the light emitter 302 is located near the housing of the light receiver 304; or in the housing of the light emitter 302 near the housing of the light receiver 304.
  • One side, and the side of the housing in which the light receiver 304 is located adjacent to the housing in which the light emitter 302 is located, are provided with spacers. Therefore, the reflective photoelectric detecting device adopting the separated structure can be flexibly set according to the smart device, and the applicability of the reflective photoelectric detecting device is improved, and space is saved.
  • the spacer 305 may be disposed only by light reflection, or may be disposed in a trapezoidal cross section and/or concave on the basis of the light reflection setting to further enhance the light reflection effect.
  • the reflective photodetection device provided by the embodiment of the present invention is applicable not only to the scene of the LED and the PD discrete device, but also to the package scenario of integrating the PD and the LED in a single chip.
  • the light emitter 302 and the light receiver 304 may be disposed on the substrate 306; the light emitter 302 and the light receiver 304, the spacer 305 and the substrate 306 are both located in the metal casing 307, and the metal casing 307 It is connected to the ground of the substrate 306. Therefore, when the metal casing 307 contacts the object to be measured, such as a human body, the human body can be electrically connected to the ground, thereby reducing the noise influence of the human body on the PD.
  • the metal shell can adopt any suitable metal with better electrical conductivity.
  • the light emitter 302 is located in the light emitting chamber 301, and the light receiver is located in the light receiving chamber 303.
  • the light emitting chamber 301 it should be understood by those skilled in the art that in practical applications, it is not limited to the light emitting chamber 301.
  • Other suitable forms are also applicable to the cavity of the light receiving chamber 303, such as a film over the light emitter 302 and the light receiver 304, the light emitter 302 and the light receiver 304 are located in the space formed by the film, and the like.
  • the light emitter 202 and the light receiver are used.
  • the 204 is disposed on the substrate 206 as an example, but is not limited thereto, and other suitable carriers are also applicable to the solution of the embodiment of the present invention.
  • the light emitter is disposed adjacent to the spacer such that the ratio between the distance between the light emitter and the spacer and the height of the spacer is less than or equal to a set value.
  • the spacer in the embodiment has reflective performance, and the light emitter is disposed close to the spacer, and part of the light emitted by the light emitter, especially the light passing through the shallow path of the skin, is redirected through the spacer. Therefore, when the biological indicator or the physiological index is detected, the amount of light passing through the shallow path of the skin can be reduced, and the amount of light of the shallow path of the reflected skin is also reduced, thereby reducing unnecessary information in the reflected light as a whole.
  • the effective information ratio increases the signal to noise ratio.
  • the accuracy of detecting the biological indicator or the physiological index of the measured object by the reflective photoelectric detecting device is improved.
  • the increase of the signal-to-noise ratio also improves the efficiency of signal processing, reduces the burden of unnecessary information processing, and reduces the power consumption of the device.
  • the reflective photoelectric detecting device of the embodiment can improve the accuracy of detecting and determining the biological index or the physiological index of the measured object by improving the position of the light emitter and the light reflection setting of the spacer. Compared with the scheme of adding additional settings to change the incident light path, the implementation method is simple and the implementation cost is low.
  • the reflective photodetection device of the above embodiments 1 to 3 can be used to perform at least one of the following measurements: biometric, physiological measurement, photoplethysmography, volume measurement (eg volume measurement of tissue/vessel/capillary, etc.) ), blood oxygen saturation measurement, cardiovascular measurement, heart rate measurement.
  • biometric biometric, physiological measurement, photoplethysmography, volume measurement (eg volume measurement of tissue/vessel/capillary, etc.) ), blood oxygen saturation measurement, cardiovascular measurement, heart rate measurement.
  • the embodiment of the present application further provides a sensor configured with any of the reflective photoelectric detecting devices according to the first embodiment to the third embodiment.
  • the embodiment of the present application further provides a smart device, where the foregoing sensor is configured.
  • the smart device includes, but is not limited to, a wristband, a watch, headphones, glasses, a ring, and the like.
  • the present invention is not limited thereto, and the reflective photodetecting device can also be configured in a mobile terminal such as a mobile phone, a mobile detecting device, or the like.

Abstract

一种光电检测装置、一种传感器及一种智能设备，其中，光电检测装置包括：光发射器（102）、光接收器（104）、设置于光发射器（102）和光接收器（104）之间的用于阻隔光发射器（102）发出的光直接射向光接收器（104）的隔离件（106）；其中，光发射器（102）位于靠近隔离件（106）处，以使光发射器（102）到隔离件（106）之间的距离与隔离件（106）高度之间的比值小于或等于设定值。提高了光电检测装置检测确定被测对象的生物指标或生理指标的准确度。

Description

光电检测装置、传感器及智能设备 技术领域
本申请实施例涉及光电检测技术领域，尤其涉及一种光电检测装置、一种传感器及一种智能设备。
背景技术
光电检测装置是光电元件利用光照变化可引起电参数变化的性质，将光信号转换成电信号而构成的检测装置。反射式光电检测装置则进一步利用光反射原理，将光源发出的光投射到被测对象上，经由被测对象反射后再投射到光电接收元件，如光电检测器上，从而实现被测对象的检测。
随着通信技术的发展，光电检测装置被越来越多地应用于智能设备中，以实现对被测对象的生物指标或生理指标的测量。例如，在光学上获得人体器官对光电容积脉搏波描记法(PPG)的容积测量以确定被测对象的心率。因来自心脏的每个心动周期的压力脉冲会引起血液的容积变化，该容积变化会影响皮肤内的光吸收的变化，当皮肤被光源如发光二极管(LED)照射，通过光电检测装置对反射回来的光中携带的信息进行处理即可实现人体的心率检测。
但是，在光电检测装置的光源发射的光中，部分光会在皮肤中走浅层路径，即仅经过表皮层和真皮层，不经过皮下血管部分；而另外部分的光走深层路径，即经过皮下血管部分。其中，走浅层路径的光从被测对象反射后携带的有效信息很少，而无用信息较多，从而影响反射式光电检测装置检测确定被测对象的生物指标或生理指标的准确度。
发明内容
本申请实施例提供一种光电检测装置、一种传感器及一种智能设备，以提高反射式光电检测装置检测确定被测对象的生物指标或生理指标的准确度。
根据本申请实施例的一个方面，提供了一种光电检测装置，包括：光发射器、光接收器、设置于所述光发射器和所述光接收器之间的用于阻隔光发射器发出的光直接射向光接收器的隔离件；其中，所述光发射器位于靠近所述隔离件处，以使所述光发射器到所述隔离件之间的距离与所述隔离件高 度之间的比值小于或等于设定值。
可选地，所述隔离件朝向所述光发射器的侧壁上设置有用于反射光线的反光层。
可选地，所述隔离件朝向光发射器侧呈内凹状。
可选地，所述隔离件的横截面为梯形，其中，所述隔离件靠近所述光发射器一侧的宽度大于远离所述光发射器一侧的宽度。
可选地，所述隔离件为不透光挡骨，和/或，所述隔离件朝向所述光发射器的侧壁上设置有用于吸收光线的吸光层。
可选地，所述光电检测装置中还设置有位于所述光发射器的上方的用于引导所述光发射器发射的光射向被测对象的第一导光组件。
可选地，所述光电检测装置中还设置有位于所述光接收器的上方的用于引导从被测对象反射的光射向所述光接收器的第二导光组件。
可选地，所述光发射器和所述光接收器均设置于基板上；所述光发射器、所述光接收器、所述隔离件及所述基板均位于金属壳体中；所述隔离件将所述金属壳体与所述基板围成的空间分为两个腔体，所述光发射器位于其中一个腔体中，所述光接收器位于另一个腔体中；所述光发射器所在腔体的底面积小于所述光接收器所在腔体的底面积。
可选地，所述光发射器位于所述两个腔体中的左侧腔体，所述光发射器到所述隔离件的距离小于所述隔离件到所述金属壳体的左侧壳体的距离的一半。
可选地，所述光发射器到所述隔离件的距离大于或等于0.2毫米。
可选地，所述金属壳体与所述基板的接地端连接。
可选地，所述光发射器和所述光接收器分别位于不同的壳体中；所述光发射器所在壳体中靠近所述光接收器所在壳体的一侧设置有隔离件。
可选地，所述光接收器所在壳体中靠近所述光发射器所在壳体的一侧也设置有隔离件。
根据本申请实施例的另一个方面，还提供了一种传感器，包括如上任一项所述的光电检测装置。
根据本申请实施例的又一个方面，还提供了一种智能设备，包括：如前所述的传感器。
根据本申请实施例提供的方案，在光电检测装置中，光发射器靠近隔离件设置，以使光发射器到隔离件之间的距离与隔离件高度之间的比值小于或等于设定值。其中，将光发射器靠近隔离件设置，通过隔离件使得光发射器发射的部分光，尤其是走皮肤浅层路径的光，被吸收或重定向。由此，在进行生物指标或生理指标检测时，可以减少走皮肤浅层路径的光量，进而也减少了反射回来的皮肤浅层路径的光量，从而从整体上减少了反射光中的无用信息，提升了有效信息占比，增加了信噪比。由此，提高了反射式光电检测装置检测确定被测对象的生物指标或生理指标的准确度。并且，信噪比的增加，也提高了信号处理的效率，降低了无用信息处理负担，降低了设备功耗。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为根据本申请实施例一的一种光电检测装置的结构示意图；
图2为根据本申请实施例二的一种光电检测装置的结构示意图；
图3为图2所示光电检测装置的俯视图；
图4为图2所示光电检测装置的正视图；
图5为根据本申请实施例二的另一种光电检测装置的结构示意图；
图6为根据本申请实施例三的一种光电检测装置的结构示意图；
图7为根据本申请实施例三的另一种光电检测装置的结构示意图；
图8为根据本申请实施例三的又一种光电检测装置的结构示意图；
图9为根据本申请实施例三的再一种光电检测装置的结构示意图。
具体实施方式
为使得本申请实施例的发明目的、特征、优点能够更加的明显和易懂，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请实施例一部分实施例，而非全部实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请实施例保护的范围。
实施例一
参照图1，示出了根据本申请实施例一的一种光电检测装置的结构示意图。
本实施例的光电检测装置包括：光发射器102、光接收器104、设置于光发射器102和光接收器104之间的用于阻隔光发射器102发出的光直接射向光接收器104的隔离件106。其中，光发射器102位于靠近隔离件106处，以使光发射器102到隔离件106之间的距离L与隔离件106的高度H之间的比值小于或等于设定值。
对于某一反射式光电检测装置而言，隔离件106的高度是确定的，当光发射器102靠近隔离件106设置时，光发射器102距离隔离件106越近，光发射器102到隔离件106之间的距离与隔离件106的高度之间的比值就越小。基于此，可以预先设置一个设定值，以使所述比值小于该设定值，使得隔离件能够将光发射器102发射的部分光，尤其是走皮肤浅层路径的光，进行吸收或重定向。
常规情况下，隔离件会位于一个承载体上，如位于基板上，该承载体与隔离件以及覆盖光发射器的装置如壳体围成一个腔体，光发射器位于该腔体中，且常规设置于该腔体的底部中线位置。但这种情况下，光发射器102产生的入射光中，在皮肤中走浅层路径的光量较大，但其反射光中携带的有效信息很少，不利于生物指标或生理指标的准确检测。基于此，在本发明实施例中，使得光发射器102靠近隔离件106设置，如图1中位于底部中线(如图1中点线状虚线所示)右侧。可见，在设置所述设定值时，若以光发射器位于底部中线时，光发射器到隔离件的距离与隔离件高度的比值为参考，则所述设定值应当小于该比值。但不限于此，在实际应用中，所述设定值也可以由本领域技术人员根据经验或者实验结果适当设置。
本实施例的光电检测装置中，光发射器102用于产生入射光，在实际应用中，光发射器102可以采用任意适当设备实现，包括但不限于发光二极管LED，LED可以包括一个或多个(两个或两个以上)。入射光可以是可见光，如绿色、蓝色、红色光，也可以是来自电磁光谱的其他不可见部分的光，例如红外光，等等。
隔离件106可以采用任意适当方式实现，如，采用不透光材料或表面喷 漆等，因其不透光，所以具有吸光性，当将光发射器102靠近隔离件106设置时，隔离件106可以吸收部分或全部原来走皮肤浅层路径的光量，从而减少了走皮肤浅层路径的光量，从整体上减少了反射光中的无用信息，提升了有效信息占比，增加了信噪比。
但不限于此，也可以将隔离件106设置成具有反射光的性能，如，为隔离件106镀膜，此种情况下，部分或全部原来走皮肤浅层路径的光经隔离件106反射后再入射皮肤，从而增加了走深层路径的光量，减少了走皮肤浅层路径的光量，也减少了反射回来的皮肤浅层路径的光量，从而从整体上减少了反射光中的无用信息，提升了有效信息占比，增加了信噪比。
此外，也可以使隔离件106同时具有吸光性和反光性，如，仅将隔离件106进行部分镀膜，这样，镀膜的部分可以反射光，未镀膜的部分可以吸收光，同样可以减少走皮肤浅层路径的光量，也减少反射回来的皮肤浅层路径的光量，从而从整体上减少了反射光中的无用信息，提升了有效信息占比，增加了信噪比。
通过增加信噪比，可以提高反射式光电检测装置检测确定被测对象的生物指标或生理指标的准确度；并且，提高信号处理的效率，降低无用信息处理负担，降低设备功耗。
光接收器104用于接收从被测对象反射回来的反射光，其可以由本领域技术人员采用任意适当设备实现，包括但不限于光学传感器。
根据本实施例的光电检测装置，光发射器靠近隔离件设置，以使光发射器到隔离件之间的距离与隔离件高度之间的比值小于或等于设定值。其中，将光发射器靠近隔离件设置，通过隔离件使得光发射器发射的部分光，尤其是走皮肤浅层路径的光，被吸收或重定向。由此，在进行生物指标或生理指标检测时，可以减少走皮肤浅层路径的光量，进而也减少了反射回来的皮肤浅层路径的光量，从而从整体上减少了反射光中的无用信息，提升了有效信息占比，增加了信噪比。由此，提高了反射式光电检测装置检测确定被测对象的生物指标或生理指标的准确度。并且，信噪比的增加，也提高了信号处理的效率，降低了无用信息处理负担，降低了设备功耗。
此外，本实施例的反射式光电检测装置通过对光发射器的位置的改进，即可提升检测确定被测对象的生物指标或生理指标的准确度，与通过增加额 外设置改变入射光路径的方案相比，实现方法简单，实现成本低。
实施例二
本实施例中，反射式光电检测装置中的隔离件具有吸光性。
图2示出了本申请实施例中的一种反射式光电检测装置的结构示意图，该反射式光电检测装置中设置有光发射器202、光接收器204、设置于光发射器202和光接收器204之间的用于阻隔光发射器202发出的光直接射向光接收器204的隔离件205。与常规反射式光电检测装置不同，本实施例中，光发射器202靠近隔离件205设置，以使光发射器202到隔离件205之间的距离与隔离件205高度之间的比值小于或等于设定值。其中，所述设定值的具体设置可参照实施例一中的描述，在此不再赘述。
本实施例中，隔离件205可以为不透光挡骨，和/或，隔离件205朝向光发射器202的侧壁上设置有用于吸收光线的吸光层。由此，使得本实施例中的隔离件205具有吸光性能。
此外，本实施例的反射式光电检测装置中，还设置有光发射室201和光接收室203。其中，光发射器202位于光发射室201中，光接收器位于光接收室203中。本领域技术人员应当明了的是，在实际应用中，不限于光发射室201和光接收室203的腔体形式，其它适当形式也同样适用，如在光发射器202和光接收器204外覆膜，光发射器202和光接收器204位于覆膜形成的空间中，等等。再者，本实施例中，以光发射器202和光接收器204设置于基板206上为例，但不限于此，其它适当的承载件也同样适用于本发明实施例的方案。
光发射室201所在空间可以由相关设备构成，例如，由光发射器202所在的基板构成底部，由隔离件205构成一侧侧壁，由其它设置或壳体构成其它侧壁，由导光组件构成顶部，等等。光发射器202设置于光发射室201中，且靠近隔离件205设置，光发射器202到隔离件205的距离与隔离件205的高度之间的比值小于或等于所述设定值。
光接收室203所在空间可以由相关设备构成，例如，由光接收器204所在的基板构成底部，由隔离件205构成一侧侧壁，由其它设置或壳体构成其它侧壁，由导光组件构成顶部，等等。其中，光接收器204设置于光接收室 203中。
具体到本实施例，反射式光电检测装置还包括一个壳体，该壳体可以为金属壳体207。光发射器202、光接收器204、隔离件205及基板206均位于该金属壳体207中。其中，隔离件205将金属壳体207与基板206围成的空间分为两个腔体，如本实施例中的光发射室201和光接收室203。光发射器202位于其中一个腔体中，如本实施例中的光发射室201；光接收器204位于另一个腔体中，如本实施例中的光接收室203；光发射器202所在腔体的底面积小于光接收器204所在腔体的底面积。如图2所示，本实施例中，光发射室201的底面积小于光接收室203的底面积，可见，图2中，光发射室201所占据的空间小于光接收室203所占据的空间。但不限于此，在实际应用中，光发射器202所在腔体的底面积大于或等于光接收器204所在腔体的底面积的情形也同样可适用于本发明实施例提供的方案。
此外，图2所示的反射式光电检测装置中，光发射器位于两个腔体中的左侧腔体，光发射器202到隔离件205的距离小于隔离件205到金属壳体207的左侧壳体的距离的一半；光接收器位于两个腔体中的右侧腔体。但不限于此，在实际应用中，也可能光发射器位于两个腔体中的右侧腔体，光接收器位于两个腔体中的左侧腔体。
图3为图2所示反射式光电检测装置的俯视图，其中，图3中无箭头的虚线示出了光发射室201的底部中线，光发射器202位于光发射室201的底部中线右侧，即靠近隔离件205侧。可选地，光发射器202可以贴近隔离件205设置，仅预留工艺公差如0.2mm即可。但本领域技术人员应当明了，在实际应用中，光发射器202到隔离件205的距离可以大于0.2mm，只需光发射器202到隔离件205的距离与隔离件205的高度的比值小于或等于所述设定值即可。
图4为图2所示反射式光电检测装置的正视图，从图4中可以清晰看到，光发射器202偏向隔离件205设置，光发射器202射向隔离件205的光被隔离件205吸收。光发射器202位于两个腔体中的左侧腔体，光发射器202到隔离件205的距离d1小于隔离件205到金属壳体207的左侧壳体的距离d2的一半d21；光接收器204位于两个腔体中的右侧腔体。
基于上述设置，图2中，光发射器202发射的入射光被分为三部分，其 中，竖线区域的光走深层路径，横线区域的光走浅层路径，斜线区域的光为原走浅层路径的光的一部分，但该部分被具有吸光性的隔离件205吸收，不再向皮肤区域投射，从而使得走浅层路径的光量减少，进而该部分光反射回的反射光也减少，使得总光量中走深层路径的光反射回来的光占比更大，携带的有效信息占比更多，增加了信噪比。
此外，反射式光电检测装置可以采用多个光发射器，如图3中所示，多个光发射器可以如多个LED。相应地，也可以采用多个光接收器，如图3中所示，多个光接收器可以如多个PD(Photo Detector，光电探测器)。在放置LED时，靠近隔离件205放置，因隔离件205为不透光挡骨和/或隔离件205朝向光发射器202的侧壁上设置有用于吸收光线的吸光层，因此当LED靠近隔离件205放置时，走浅层路径的光将被隔离件205吸收，则PD上接受到的浅层路径光变少，有效信号变多，从而提升了信噪比。
需要说明的是，隔离件205不限于图2至图4中所示平面的面形，还可以采用梯形、规则或不规则曲面的形状，或者其它适当形状，以改变照射于其上的光线的路径，使照射于其上的光线被吸收，不使其进入皮肤，减少走浅层路径的光量。
另一种可行的反射式光电检测装置如图5所示，与图2所示的反射式光电检测装置不同的是，图5中的光发射室201和光接收室203相互独立，也即，光发射器202和光接收器204分别位于不同的壳体中。此种情况下，光发射器202和光接收器204所在基板可以为不同的基板，光发射器202所在壳体中靠近光接收器204所在壳体的一侧设置有隔离件。可选地，还可以在光接收器204所在壳体中靠近光发射器202所在壳体的一侧也设置隔离件。也即，可以仅在光发射室201中设置隔离件205(图5所示方案)，但不限于此，也可以在光接收室203中也设置隔离件205。
图5所示的反射式光电检测装置采用光发射室201和光接收室203分离结构，可以根据智能设备的结构灵活设置，提高反射式光电检测装置适用性，节约空间。
由上可见，本申请实施例提供的反射式光电检测装置不仅适用于LED、PD分立器件的场景，也可适用于在单芯片集成PD、LED的封装场景。
可选地，反射式光电检测装置中还可以设置有位于光发射器202的上方 的用于引导光发射器202发射的光射向被测对象的第一导光组件，和/或，反射式光电检测装置中设置有位于光接收器204的上方的用于引导从被测对象反射的光射向光接收器204的第二导光组件。进一步可选地，第一导光组件可以向被测对象的方向凸起，和/或，第二导光组件可以向所述光接收器的方向凹陷。例如，在光发射室201顶部设置第一导光组件208并且将其设置为向光发射室201的外部(即被测对象方向)凸起的结构，以提高光投射效果；和/或，在光接收室203顶部设置第二导光组件209并且将其设置为向光接收室203的内部(即光接收器204方向)凹陷的结构，以提高光接收效果。
此外，可选地，光发射器202和光接收器204可均设置于基板206上；光发射器202、光接收器204、隔离件205及基板206均位于金属壳体207中，且金属壳体207与基板206的接地端连接。从而，在金属壳体207接触被测对象如人体时，能将人体与地导通，降低人体对PD的噪声影响。其中，金属壳体可以采用任意适当的导电性能较好的金属。
根据本实施例的反射式光电检测装置，光发射器靠近隔离件设置，以使光发射器到隔离件之间的距离与隔离件高度之间的比值小于或等于设定值。其中，本实施例中的隔离件具有吸光性能，将光发射器靠近隔离件设置，通过隔离件使得光发射器发射的部分光，尤其是走皮肤浅层路径的光，被吸收。由此，在进行生物指标或生理指标检测时，可以减少走皮肤浅层路径的光量，进而也减少了反射回来的皮肤浅层路径的光量，从而从整体上减少了反射光中的无用信息，提升了有效信息占比，增加了信噪比。由此，提高了反射式光电检测装置检测确定被测对象的生物指标或生理指标的准确度。并且，信噪比的增加，也提高了信号处理的效率，降低了无用信息处理负担，降低了设备功耗。
此外，本实施例的反射式光电检测装置通过对光发射器的位置的改进，即可提升检测确定被测对象的生物指标或生理指标的准确度，与通过增加额外设置改变入射光路径的方案相比，实现方法简单，实现成本低。
实施例三
本实施例中，反射式光电检测装置中的隔离件具有光反射性能。
一种可行的反射式光电检测装置如图6所示，包括：光发射室301、光发 射器302、光接收室303、光接收器304、隔离件305、基板306、金属外壳307、第一导光组件308、第二导光组件309。
其中，光发射器302设置于光发射室301中，光接收器304设置于光接收室303中，隔离件305设置于光发射室301和光接收室303之间。光发射器302靠近隔离件305设置，以使光发射器302到隔离件305之间的距离与隔离件305高度之间的比值小于或等于设定值。其中，所述设定值的具体设置可参照实施例一中的描述，在此不再赘述。进一步可选地，光发射器302到隔离件305的距离等于或大于0.2毫米。
本实施例中，光发射器302和光接收器304设置于同一基板306上。光发射器302的上方设置有用于引导光发射器302发射的光射向被测对象的第一导光组件，如，图6中设置于光发射室301顶部的第一导光组件308；光接收器304的上方设置有用于引导从被测对象反射的光射向光接收器304的第二导光组件，如，图6中设置于光接收室303顶部的第二导光组件309。
光发射器302、光接收器304、隔离件305及基板306均位于金属壳体307中；隔离件305将金属壳体307与基板306围成的空间分为两个腔体，光发射器302位于其中一个腔体中，光接收器304位于另一个腔体中；光发射器302所在腔体的底面积小于光接收器304所在腔体的底面积。具体地，反射式光电检测装置通过金属壳体307、基板306、第一导光组件308和第二导光组件309形成一个空间，该空间由隔离件305分隔成光发射室301和光接收室303。其中，第一导光组件308和第二导光组件309设置于金属壳体307上。图6中，隔离件305将金属壳体307和基板306围成的腔体分为光发射室301和光接收室303，光发射室301的底面积小于光接收室303的底面积，也即光发射室301所占据的空间小于光接收室303所占据的空间。但不限于此，在实际应用中，光发射器202所在腔体的底面积大于或等于光接收器204所在腔体的底面积的情形也同样可适用于本发明实施例提供的方案。
图6中，光发射室301位于左侧，光接收室303位于右侧，光发射器302位于光发射室301中且靠近隔离件305设置，光接收器304位于光接收室303中。可选地，光发射器302到隔离件305的距离小于隔离件305到金属壳体307的左侧壳体的距离的一半。进一步可选地，在满足光发射器302到隔离件305之间的距离与隔离件305高度之间的比值小于或等于设定值的条件下， 光发射器302到隔离件305的距离大于或等于0.2毫米。但不限于此，在实际应用中，也可能光发射器位于两个腔体中的右侧腔体，光接收器位于两个腔体中的左侧腔体。
本实施例中，隔离件305朝向光发射器302的侧壁上设置有用于反射光线的反光层，其中，该反光层可以由本领域技术人员根据实际需要采用任意适当手段实现，包括但不限于反光镀膜，如图6中的镀膜310(图6中交叉线条区域)。由图6中可见，因光发射器302靠近隔离件305设置，由此，光发射器302发射的光中，入射向隔离件305的光被隔离件305反射后射向入射面，如第一导光组件308，从而使得部分或全部原来走浅层路径的光(如图6中横线区域)经隔离件305反射后变为走深层路径的光，与原来走深层路径的光(如图6中竖线区域)一起均投射向皮肤的皮下血管部分。其中，经隔离件305反射后的光的光线路径如图6中带箭头的虚线弧形所示，原来走深层路径的光的光线路径如图6中带箭头的实线弧形所示。
可选地，为进一步提高光反射效果，具有反光层的隔离件305朝向光发射器302一侧可以为内凹状，其在垂直于隔离件305的长度方向上的横截面的截面图如图7中所示。需要说明的是，隔离件305可以整体采用相同内凹弧度，即隔离件305任意位置处的横截面的弧度均相同；也可以在隔离件305上设置凹洞，即横截面为渐变弧度，越靠近隔离件的另一侧，弧度越大。
另一种可选的隔离件305的反光层如图8中所示，其在垂直于隔离件305的长度方向上的横截面为梯形，以使入射光投射的深度更深，更好地携带有效信息。其中，隔离件305靠近光发射器302一侧的宽度大于远离光发射器302一侧的宽度。进一步可选地，梯形的隔离件305朝向光发射器302一侧也可以设置为内凹状，以进一步提升光反射效果。
可见，采用本实施例中具有光反射效果的隔离件设置，隔离件可以通过镀膜或金属材料(如表面抛光度比较好的金属材料，如，金、银、铜等等)来具备反射特性，当光发射器靠近隔离件放置时，原来走浅层路径的光将被隔离件反射，反射的光变为走深层路径的光，从而使得光接收器上接受到的走浅层路径反射回来的光量变少，有效信号变多，从而提升了信噪比。
需要说明的是，隔离件305不限于上述平面、梯形等面形，还可以采用规则或不规则曲面的形状，或者其它适当形状，以改变照射于其上的光线的 路径，使照射于其上的光线产生反射，改变其进入皮肤的路径，减少走浅层路径的光量即可。
进一步可选地，第一导光组件308可以设置为向被测对象的方向凸起，如图9中所示，以提升光投射效果；和/或，第二导光组件309可以设置向光接收器304的方向凹陷，如图9中所示，以提升光接收效果。需要说明的是，实际使用中，也可仅采用外凸的第一导光组件308或者仅采用内凹的第二导光组件309。
此外，与图5所示反射式光电检测装置类似，本实施例中的光发射室301和光接收室303也可以相互独立。如，光发射器302位于第一壳体中，光接收器304处于第二壳体中，第一壳体和第二壳体为不同的壳体。此种情况下，光发射器302和光接收器304所在的基板可以为不同的基板。
此种情况下，可以仅在光发射器302所在壳体中靠近光接收器304所在壳体的一侧设置隔离件；也可以在光发射器302所在壳体中靠近光接收器304所在壳体的一侧，以及，光接收器304所在壳体中靠近光发射器302所在壳体的一侧，均设置隔离件。从而使得采用这种分离结构的反射式光电检测装置可以根据智能设备灵活设置，提高反射式光电检测装置适用性，节约空间。
可选地，隔离件305可以仅进行光反射设置，也可以如前所述，在光反射设置的基础上，设置为梯形横截面和/或内凹，以进一步提升光反射效果。
由上可见，本申请实施例提供的反射式光电检测装置不仅适用于LED、PD分立器件的场景，也可适用于在单芯片集成PD、LED的封装场景。
此外，可选地，光发射器302和光接收器304可均设置于基板306上；光发射器302和光接收器304、隔离件305以及基板306均位于金属壳体307中，且金属壳体307与基板306的接地端连接。从而，在金属壳体307接触被测对象如人体时，能将人体与地导通，降低人体对PD的噪声影响。其中，金属壳体可以采用任意适当的导电性能较好的金属。
此外，本实施例中，以光发射器302位于光发射室301中，光接收器位于光接收室303中为例，但本领域技术人员应当明了，在实际应用中，不限于光发射室301和光接收室303的腔体形式，其它适当形式也同样适用，如在光发射器302和光接收器304外覆膜，光发射器302和光接收器304位于覆膜形成的空间中，等等。再者，本实施例中，以光发射器202和光接收器 204设置于基板206上为例，但不限于此，其它适当的承载件也同样适用于本发明实施例的方案。
根据本实施例的反射式光电检测装置，光发射器靠近隔离件设置，以使光发射器到隔离件之间的距离与隔离件高度之间的比值小于或等于设定值。其中，本实施例中的隔离件具有反光性能，将光发射器靠近隔离件设置，通过隔离件使得光发射器发射的部分光，尤其是走皮肤浅层路径的光，被重定向。由此，在进行生物指标或生理指标检测时，可以减少走皮肤浅层路径的光量，进而也减少了反射回来的皮肤浅层路径的光量，从而从整体上减少了反射光中的无用信息，提升了有效信息占比，增加了信噪比。由此，提高了反射式光电检测装置检测确定被测对象的生物指标或生理指标的准确度。并且，信噪比的增加，也提高了信号处理的效率，降低了无用信息处理负担，降低了设备功耗。
此外，本实施例的反射式光电检测装置通过对光发射器的位置的改进，和对隔离件的光反射设置，即可提升检测确定被测对象的生物指标或生理指标的准确度，与通过增加额外设置改变入射光路径的方案相比，实现方法简单，实现成本低。
上述实施例一至三中的反射式光电检测装置可以用于进行以下测量中的至少一个：生物测量、生理测量、光电容积脉搏波描记测量、容积测量(如组织/血管/毛细血管等的容积测量)、血氧饱和度测量、心血管测量、心率测量。
本申请实施例还提供了一种传感器，该传感器中配置有如前实施例一至三种任意的反射式光电检测装置。
此外，本申请实施例还提供了一种智能设备，该智能设备中配置有上述传感器。该智能设备包括但不限于手环、手表、耳机、眼镜、戒指等等。但不限于此，该反射式光电检测装置还可配置于移动终端如手机、移动检测设备中等等。
以上实施例仅用以说明本申请实施例的技术方案，而非对其限制；尽管参照前述实施例对本申请实施例进行了详细的说明，本领域的普通技术人员 应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。

Claims (15)

  1. 一种光电检测装置，包括：光发射器、光接收器、设置于所述光发射器和所述光接收器之间的用于阻隔光发射器发出的光直接射向光接收器的隔离件；
    其中，
    所述光发射器位于靠近所述隔离件处，以使所述光发射器到所述隔离件之间的距离与所述隔离件高度之间的比值小于或等于设定值。
  2. 根据权利要求1所述的装置，其中，所述隔离件朝向所述光发射器的侧壁上设置有用于反射光线的反光层。
  3. 根据权利要求2所述的装置，其中，所述隔离件朝向光发射器侧呈内凹状。
  4. 根据权利要求2或3所述的装置，其中，所述隔离件的横截面为梯形，其中，所述隔离件靠近所述光发射器一侧的宽度大于远离所述光发射器一侧的宽度。
  5. 根据权利要求1所述的装置，其中，所述隔离件为不透光挡骨，和/或，所述隔离件朝向所述光发射器的侧壁上设置有用于吸收光线的吸光层。
  6. 根据权利要求1-5任一项所述的装置，其中，所述装置中还设置有位于所述光发射器的上方的用于引导所述光发射器发射的光射向被测对象的第一导光组件。
  7. 根据权利要求1-6任一项所述的装置，其中，所述装置中还设置有位于所述光接收器的上方的用于引导从被测对象反射的光射向所述光接收器的第二导光组件。
  8. 根据权利要求1所述的装置，其中，所述光发射器和所述光接收器均设置于基板上；所述光发射器、所述光接收器、所述隔离件及所述基板均位于金属壳体中；所述隔离件将所述金属壳体与所述基板围成的空间分为两个腔体，所述光发射器位于其中一个腔体中，所述光接收器位于另一个腔体中；所述光发射器所在腔体的底面积小于所述光接收器所在腔体的底面积。
  9. 根据权利要求8所述的装置，其中，所述光发射器位于所述两个腔体中的左侧腔体，所述光发射器到所述隔离件的距离小于所述隔离件到所述金属壳体的左侧壳体的距离的一半。
  10. 根据权利要求9所述的装置，其中，所述光发射器到所述隔离件的距离大于或等于0.2毫米。
  11. 根据权利要求8所述的装置，其中，所述金属壳体与所述基板的接地端连接。
  12. 根据权利要求1-7任一项所述的装置，其中，所述光发射器和所述光接收器分别位于不同的壳体中；所述光发射器所在壳体中靠近所述光接收器所在壳体的一侧设置有隔离件。
  13. 根据权利要求12所述的装置，其中，所述光接收器所在壳体中靠近所述光发射器所在壳体的一侧也设置有隔离件。
  14. 一种传感器，包括：如权利要求1-13任一项所述的光电检测装置。
  15. 一种智能设备，包括：如权利要求14所述的传感器。
PCT/CN2017/110802 2017-11-14 2017-11-14 光电检测装置、传感器及智能设备 WO2019095093A1 (zh)

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CN111265200A (zh) * 2020-02-21 2020-06-12 广东高驰运动科技有限公司 可穿戴式生理信号检测装置及检测方法
WO2021253451A1 (zh) * 2020-06-19 2021-12-23 深圳市汇顶科技股份有限公司 生物特征检测装置及智能穿戴设备

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