Lens assembly and wearable device

Abstract

The utility model provides a lens assembly and a wearable device. The lens assembly comprises a lens and a detection module. The lens comprises a plurality of lens groups; the lens group comprises a central part and a plurality of light guide parts which are sequentially arranged on the periphery of the central part in a surrounding manner; the detection module comprises a plurality of light-emitting assemblies, and each light-emitting assembly comprises a substrate and at least one detection chip assembled on the substrate; wherein the light-emitting assembly and the lens group are correspondingly arranged in position, and the distance between the central axis of at least one detection chip of the light-emitting assembly and the central axis of the central part of the lens group corresponding in position is within a set range. By means of the arrangement, light emitted by each light-emitting assembly can be deflected through the corresponding lens set, and transmission of a light path is facilitated; and more light emitted by the detection chip can pass through the central part, so that more optical signals can be transmitted, higher optical efficiency is met, and the loss of light is reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of detection, and in particular to a lens assembly and a wearable device. Background Art

[0002] As users pay more attention to their health, health detection equipment has become one of the most important devices. At present, due to users' pursuit of health monitoring experience, the mainboard of wearable devices is developing towards multiple LEDs. In related technologies, when wearable devices use multiple LED lights, multiple optical axes will be formed. During the reflection process of the optical path of multiple optical axes, the deflection direction of the optical path is not conducive to receiving signals, resulting in partial light deviation and loss. When the wearable device shakes, the interference signal is strong and the detection accuracy is low. Utility Model Content

[0003] The present invention provides a lens assembly and a wearable device that are advantageous for receiving signals, have low light loss and high detection accuracy.

[0004] The present disclosure provides a lens assembly, comprising:

[0005] The lens comprises a plurality of lens groups; the lens groups comprise a central portion and a plurality of light guide portions sequentially arranged around the central portion;

[0006] A detection module, comprising a plurality of light-emitting components, wherein the light-emitting components include a substrate and at least one detection chip assembled on the substrate;

[0007] The light emitting assembly is arranged corresponding to the position of the lens group, and the distance between the central axis of at least one detection chip of the light emitting assembly and the central axis of the central part of the lens group at the corresponding position is within a set range.

[0008] Optionally, the multiple light-guiding portions surrounded by the periphery of the central portion of the lens group are ring-shaped, and the multiple light-guiding portions are concentrically arranged with the central portion as the center.

[0009] Optionally, the light guiding portion comprises annular teeth, and along a direction away from the central portion, an angle between a side of each annular tooth away from the central portion and a central axis of the central portion gradually increases.

[0010] Optionally, the lens includes an incident surface and an exit surface that are arranged opposite to each other, the incident surface is arranged toward the detection module, and the central portion and the light guiding portion are formed on the incident surface.

[0011] Optionally, the lens assembly further includes a shell, the detection module is assembled in the shell, and the detection module further includes a plurality of receiving components located around the plurality of light-emitting components.

[0012] Optionally, the distance between the central axis of the detection chip and the central axis of the receiving element close to the detection chip is in the range of 3-5 mm.

[0013] Optionally, the lens assembly further includes a shading member, which is disposed between the outer sides of the plurality of light-emitting components and the inner sides of the plurality of receiving components, one end of the shading member abuts against the shell, and the other end of the shading member abuts against the lens.

[0014] Optionally, the central axis of the detection chip and the central axis of the central part corresponding to the detection chip are not in a straight line, and the central axis of the detection chip is closer to the receiving element relative to the central axis of the central part corresponding to the detection chip.

[0015] Optionally, the setting range is 0-2mm.

[0016] Optionally, the lens comprises a Fresnel lens.

[0017] Optionally, the focal length range of the lens is 0.1-4 mm.

[0018] The present disclosure also provides a wearable device, which includes a lens assembly as described in any one of the above.

[0019] The lens assembly and wearable device provided by the present disclosure are arranged in a corresponding position between the light-emitting assembly and the lens group, so that the light emitted by each light-emitting assembly can be deflected by the corresponding lens group, which is beneficial to the transmission of the light path; the distance between the central axis of at least one detection chip of the light-emitting assembly and the central axis of the central part of the lens group at the corresponding position is within a set range, so that the light emitted by the detection chip can pass more through the central part, which is beneficial to the transmission of more light signals, meet higher light efficiency, reduce light loss, suppress interference signals, and improve detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0021] Figure 1 Shown is a schematic diagram of one embodiment of a lens assembly of the present disclosure.

[0022] Figure 2 Shown is a schematic diagram of yet another embodiment of a lens assembly according to the present disclosure.

[0023] Figure 3 FIG. 1 is a schematic diagram of another embodiment of a lens assembly according to the present disclosure.

[0024] Figure 4 Shown Figure 1A partial structural schematic diagram of an embodiment of a lens group of a lens assembly.

[0025] Figure 5 The figure is a curve chart showing the influence of shaking of the wearable device of the related art on the amount of signal received by the receiving element.

[0026] Figure 6 The figure is a graph showing an embodiment of the effect of shaking of the wearable device of the present invention on the amount of signal received by the receiving element.

[0027] Figure 7 Shown is a Cartesian coordinate diagram of light intensity distribution in the related art.

[0028] Figure 8 Shown is a Cartesian coordinate diagram of one embodiment of the light intensity distribution of the present disclosure.

[0029] Fig. 9 Shown is a polar coordinate diagram of light intensity distribution of the related art.

[0030] Fig.10 Shown is a polar plot of one embodiment of the light intensity distribution of the present disclosure.

[0031] Fig.11 Shown is a time-frequency diagram of the PPG spectrum impact of the related art.

[0032] Fig.12 Another time-frequency diagram of the PPG spectrum impact of the related art is shown.

[0033] Fig.13 Shown is a time-frequency diagram of one embodiment of the PPG spectrum impact of the present disclosure.

[0034] Description of reference numerals:

[0035] Lens assembly 100; lens 1; lens group 11; central portion 111; light guiding portion 112; annular teeth 113; first tooth surface 114; second tooth surface 115; incident surface 12; exit surface 13; detection module 2; light emitting assembly 21; substrate 212; detection chip 213; receiving element 22; housing 3; upper housing 31; lower housing 32; shading element 4. DETAILED DESCRIPTION

[0036] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices consistent with some aspects of the present disclosure as detailed in the appended claims.

[0037] The terms used in this disclosure are only for the purpose of describing specific embodiments and are not intended to limit the disclosure. Unless otherwise defined, the technical terms or scientific terms used in this disclosure should be understood by people with ordinary skills in the field to which the disclosure belongs. Similar words such as "one" or "a" used in this disclosure specification and claims do not indicate a quantitative limitation, but indicate that there is at least one. "Multiple" includes two, which is equivalent to at least two. Similar words such as "include" or "include" mean that the elements or objects appearing in front of "include" or "include" include the elements or objects listed after "include" or "include" and their equivalents, and do not exclude other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, and can include electrical connections, whether direct or indirect. The singular forms of "one", "said" and "the" used in this disclosure specification and the attached claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0038] The present disclosure includes a lens assembly including a lens and a detection module. The lens includes a plurality of lens groups; the lens group includes a central portion and a plurality of light-guiding portions sequentially arranged around the periphery of the central portion; the detection module includes a plurality of light-emitting components, the light-emitting components including a substrate and at least one detection chip assembled on the substrate; wherein the light-emitting components are arranged correspondingly to the positions of the lens groups, and the distance between the central axis of at least one detection chip of the light-emitting components and the central axis of the central portion of the lens group corresponding to the position is within a set range. The light-emitting components are arranged correspondingly to the positions of the lens groups, so that the light emitted by each light-emitting component can be deflected by the corresponding lens group, which is beneficial to the transmission of the light path; the distance between the central axis of at least one detection chip of the light-emitting components and the central axis of the central portion of the lens group corresponding to the position is within a set range, so that the light emitted by the detection chip can pass through the central portion more, which is beneficial to the transmission of more light signals, meet higher light efficiency, and reduce light loss.

[0039] The present disclosure provides a lens assembly and a wearable device. The lens assembly and the wearable device of the present disclosure are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0040] Figure 1 FIG. 1 is a schematic diagram of an embodiment of a lens assembly 100 of the present disclosure. Figure 1In the illustrated embodiment, this embodiment provides a wearable device. The wearable device may be a wearable watch, a wearable bracelet, a head-mounted device, etc. The wearable device detects vital signs such as heart rate and blood oxygen through PPG technology (PPG, full name Photoplethysmography). The wearable device includes a lens assembly 100. The lens assembly 100 includes a lens 1 and a detection module 2. The lens 1 can be used to focus and refract light. The lens 1 includes a plurality of lens groups 11. In this embodiment, a total of two lens groups 11 are included. It can also be set to other numbers of lens groups 11, not limited to this. The lens group 11 includes a central portion 111 and a plurality of light guide portions 112 sequentially arranged around the periphery of the central portion 111. The light guide portion 112 is used to improve the utilization rate of light. After passing through the central portion 111 and the plurality of light guide portions 112 arranged around the periphery of the central portion 111, more optical signals are ensured to be transmitted. The detection module 2 includes a plurality of light-emitting components 21, and the light-emitting components 21 include a substrate 212 and at least one detection chip 213 assembled on the substrate 212. The light-emitting component 21 can be an LED. In this embodiment, there are two light-emitting components 21, and it can also be set to 3, 4, 5, etc., without limitation thereto. The substrate 212 is used to integrate a plurality of detection chips 213 into one light-emitting component 21, and the detection chip 213 can be a monitoring die, and the detection chip 213 is used to emit a light signal and detect the vital signs of the human body. In this embodiment, the detection chip 213 can be information for detecting the heart rate of the user, and the detection chip 213 can also be information for detecting the blood oxygen of the user. In this embodiment, three detection chips 213 are provided, of which two detection chips 213 are used to detect the blood oxygen information of the user, and one detection chip 213 is used to detect the heart rate information of the user. In some other embodiments, other numbers of detection chips 213 can also be provided, such as 1, 2, 4, 5, 6, etc., without limitation thereto. In this way, the light-emitting component 21 can be a die-integrated LED, or multiple die-integrated LEDs, such as 2-in-1, 3-in-1, 4-in-1, 5-in-1, 6-in-1, etc. When there are multiple light-emitting components 21, the multiple light-emitting components 21 can be set as a die-integrated LED, or multiple die-integrated LEDs can be set, or they can be set as a combination of one die-integrated LED and multiple die-integrated LEDs. Among them, the light-emitting component 21 is set corresponding to the position of the lens group 11, and the distance between the central axis of at least one detection chip 213 of the light-emitting component 21 and the central axis of the central part 111 of the lens group 11 at the corresponding position is within a set range. In this way, the light-emitting component 21 is set corresponding to the position of the lens group 11, so that the light emitted by each light-emitting component 21 can be deflected by the corresponding lens group 11, which is beneficial to the transmission of the light path.The distance between the central axis of at least one detection chip 213 of the light-emitting component 21 and the central axis of the central part 111 of the lens group 11 at the corresponding position is within a set range, so that the light emitted by the detection chip 213 can pass more through the central part 111, which is conducive to transmitting more light signals, meeting higher light efficiency, reducing light loss, suppressing interference signals, and improving detection accuracy.

[0041] exist Figure 1 In the illustrated embodiment, the lens 1 includes an incident surface 12 and an exit surface 13 that are relatively arranged, the incident surface 12 is arranged toward the detection module 2, and the incident surface 12 is formed with a central portion 111 and a light guide portion 112. In the present embodiment, the exit surface 13 is a light surface. Such an arrangement improves the efficiency of optical signal transmission and improves the accuracy of detection. In some other embodiments, the incident surface 12 can also be set as a light surface, and the exit surface 13 can be formed with a central portion 111 and a light guide portion 112, but is not limited thereto. The setting range is 0-2mm. The setting range of the distance between the central axis of at least one detection chip 213 of the light-emitting component 21 and the central axis of the central portion 111 of the lens group 11 corresponding to the position is 0-2mm. In the present embodiment, the distance between the central axis of at least one detection chip 213 of the light-emitting component 21 and the central axis of the central portion 111 of the lens group 11 corresponding to the position can be 0mm, 1mm, 2mm, etc., but is not limited thereto. Such an arrangement can improve the light efficiency and the accuracy of detection. In some other embodiments, it can also be set to other distances, but is not limited thereto. The lens 1 includes a Fresnel lens 1. The Fresnel lens 1 can play a focusing role and reduce light loss. The focal length range of the lens 1 is 0.1-4 mm. The lens 1 within this focal length range can further improve the light transmission efficiency and reduce light loss.

[0042] Figure 2 FIG. 1 is a schematic diagram of another embodiment of a lens assembly 100 of the present disclosure. Figure 1 and Figure 2In the illustrated embodiment, the lens assembly 100 further includes a housing 3, the detection module 2 is assembled on the housing 3, and the detection module 2 further includes a plurality of receiving elements 22 located on the periphery of the plurality of light emitting components 21. By providing a plurality of light emitting components 21 and a plurality of receiving elements 22, a staggered mesh structure of multiple light paths can be realized, the signal coverage range can be improved, the light path failure or signal deterioration caused by the wearable device during exercise can be solved, and the quality signal can be further improved and strengthened after the fusion of different data. The receiving element 22 can be a PD receiving sensor. In the present embodiment, the housing 3 includes an upper housing 31 and a lower housing 32 assembled with the upper housing 31, the detection module 2 is assembled on the upper housing 31, and the lens 1 is assembled with the lower housing 32. In the present embodiment, the lens 1 and the lower housing 32 are assembled to form a circular aperture or light window, and a ring-shaped aperture or light window. In some other embodiments, apertures or wide windows of other shapes can also be set. A cavity is formed between the lens 1 and the upper housing 31, and a plurality of light emitting components 21 and a plurality of receiving elements 22 located on the periphery of the light emitting components 21 are placed in the cavity. In this embodiment, multiple receiving elements 22 are evenly distributed in a ring shape around the multiple light-emitting components 21. In some embodiments, the receiving elements 22 can be set to 2, 4, 6, 8, etc., but not limited thereto. Multiple receiving elements 22 can be symmetrically distributed around the multiple light-emitting components 21. The effective sensing area of ​​the receiving element 22 can be rectangular, circular, elliptical, etc., but not limited thereto. In this embodiment, light is emitted from the light-emitting component 21, passes through the lens 1, and after scattering, absorption, transmission, etc. of the skin biological components such as the wrist, part of the light returns to the receiving element 22 along the light path for reception. In this way, the position layout is more reasonable, and the performance is guaranteed while taking into account the aesthetics. The lens assembly 100 also includes a shading element 4, which is arranged between the outer side of the multiple light-emitting components 21 and the inner side of the multiple receiving elements 22, one end of the shading element 4 abuts against the housing 3, and the other end of the shading element 4 abuts against the lens 1. The shading element 4 can be a shading baffle or a silicone sleeve. In this configuration, the shading member 4 is disposed between the outer side of the light emitting component 21 and the receiving member 22, which can play a sealing role, block internal crosstalk, and improve the signal-to-noise ratio (SNR, full name Signal-to-Noise Ratio) of the optical path.

[0043] exist Figure 2In the illustrated embodiment, the distance between the central axis of the detection chip 213 and the central axis of the receiving element 22 close to the detection chip 213 ranges from 3-5 mm. The distance between the central axis of the detection chip 213 and the central axis of the receiving element 22 close to the detection chip 213 may be 3 mm, 4 mm, 5 mm, etc., but is not limited thereto. In some embodiments, the distance between the central axis of the detection chip 213 and the central axis of the receiving element 22 close to the detection chip 213 ranges from 3.5-4.5 mm. The distance between the central axis of the detection chip 213 and the central axis of the receiving element 22 close to the detection chip 213 may be 3.5 mm, 4.5 mm, etc., but is not limited thereto. With such a configuration, the FWHM of the detection chip 213 satisfies that the FWHM is greater than or equal to 60° and less than or equal to 130°, which can ensure more effective light energy, reduce noise, and achieve better performance.

[0044] Figure 3 FIG. 1 is a schematic diagram of another embodiment of a lens assembly 100 of the present disclosure. Figure 3 In the embodiment shown, the central axis of the detection chip 213 is not in a straight line with the central axis of the central part 111 corresponding to the detection chip 213, and the central axis of the detection chip 213 is closer to the receiving element 22 relative to the central axis of the central part 111 corresponding to the detection chip 213. Such an arrangement can improve the light efficiency and modulate the spatial distribution curve of the light intensity angle, thereby realizing the screening and shielding of the receiving light path of the receiving element 22, avoiding the path of the surface signal entering the receiving element 22, and avoiding the high-energy epidermal reflected light entering the receiving element 22 when the wearable device is slightly shaken, so as to avoid affecting the accuracy.

[0045] exist Figure 3 In the embodiment shown, the multiple light guides 112 surrounded by the periphery of the central portion 111 of the lens group 11 are annular, and the multiple light guides 112 are concentrically arranged around the central portion 111. In this embodiment, the multiple light guides 112 are annular. In some other embodiments, they can also be set to shapes such as elliptical and rectangular. And the multiple light guides 112 are concentrically arranged around the central portion 111, which is conducive to the transmission of the light path and improves the accuracy of wearable device detection.

[0046] Figure 4 Shown Figure 1 A partial structural diagram of an embodiment of a lens group 11 of a lens assembly 100. Figure 4In the illustrated embodiment, the light guide portion 112 includes an annular tooth 113, and the angle between the side of each annular tooth 113 away from the center portion 111 and the central axis of the center portion 111 gradually increases along the direction away from the center portion 111. In this embodiment, the annular tooth 113 includes a first tooth surface 114 and a second tooth surface 115. The first tooth surface 114 and the second tooth surface 115 can be a plane, a curved surface, or a combination of a curved surface and a plane, but are not limited thereto. The first tooth surface 114 is inclined from top to bottom, and the second tooth surface 115 is inclined from bottom to top, and the second tooth surface 115 is away from the center portion 111 relative to the first tooth surface 114. In a lens group 11, along the direction away from the center portion 111, the angle between the second tooth surface 115 of each annular tooth 113 and the central axis of the center portion 111 gradually increases. In this way, the irradiation area of ​​stray light can be effectively dispersed and the illumination of stray light can be reduced, so that the receiving element 22 can receive a good signal of the deep skin and reduce the noise signal of the diffuse reflection of the epidermis.

[0047] Figure 5 The figure is a curve chart showing the influence of shaking of the wearable device of the related art on the amount of signal received by the receiving element. Figure 6 The figure is a graph showing an embodiment of the influence of the signal receiving amount of the receiving element when the wearable device of the present disclosure is shaken. Figure 5 and Figure 6 As shown in the comparison, Figure 6 The receiving amount of the signal of the receiving element in the illustrated embodiment is higher, the capability of the effective signal is improved, and the accuracy of user detection is improved.

[0048] Figure 7 Shown is a Cartesian coordinate diagram of light intensity distribution in the related art. Figure 8 The Cartesian coordinate diagram of one embodiment of the light intensity distribution of the present disclosure is shown. Figure 7 and Figure 8 As shown in the comparison, Figure 8 In the illustrated embodiment, the Cartesian coordinate diagram of the light intensity distribution presents a double central peak, which can meet higher light efficiency, reduce the noise light path generated by the epidermal light path under the shaking of the wearable device and enter the receiving element, reduce the interference of the noise light path on the PPG effective power spectrum or energy spectrum, reduce the possibility of dimming saturation, improve the signal-to-noise ratio, reduce the situation where the noise light path submerges the PPG signal, and improve the detection accuracy of the wearable device.

[0049] Fig. 9 Shown is a polar coordinate diagram of light intensity distribution of the related art. Fig.10 The polar coordinate diagram of one embodiment of the light intensity distribution of the present disclosure is shown. Fig. 9 and Fig.10 As shown in the comparison, Fig.10In the illustrated embodiment, the Cartesian coordinate diagram of the light intensity distribution presents a double central peak, which is beneficial to the transmission of dynamic heart rate signals, reduces light loss, reduces the interference of the noise optical path on the PPG effective power spectrum or energy spectrum, reduces the possibility of dimming saturation, and improves the signal-to-noise ratio, reducing the situation where the noise optical path submerges the PPG signal.

[0050] Fig.11 Shown is a time-frequency diagram of the PPG spectrum impact of the related art. Fig.12 Another time-frequency diagram of the PPG spectrum impact of the related art is shown. Fig.13 Shown is a time-frequency diagram of an embodiment of the PPG spectrum impact of the present disclosure. Fig.11 , Fig.12 and Fig.13 As shown in the comparison, Fig.13 In the illustrated embodiment, the light display is better, the light signal is easier to identify, the light signal noise is minimal, and the wearable device detection accuracy is higher.

[0051] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

1. A lens assembly, characterized in that: include: The lens comprises a plurality of lens groups; the lens groups comprise a central portion and a plurality of light guide portions sequentially arranged around the central portion; A detection module, comprising a plurality of light-emitting components, wherein the light-emitting components include a substrate and at least one detection chip assembled on the substrate; The light emitting assembly is arranged corresponding to the position of the lens group, and the distance between the central axis of at least one detection chip of the light emitting assembly and the central axis of the central part of the lens group at the corresponding position is within a set range.

2. The lens assembly according to claim 1, characterized in that The plurality of light-guiding portions arranged around the periphery of the central portion of the lens group are in a ring shape, and the plurality of light-guiding portions are arranged concentrically with the central portion as the center.

3. The lens assembly according to claim 1, characterized in that The light guiding portion comprises annular teeth, and along a direction away from the central portion, an angle between a side of each annular tooth away from the central portion and a central axis of the central portion gradually increases.

4. The lens assembly according to claim 1, characterized in that The lens includes an incident surface and an exit surface that are arranged opposite to each other. The incident surface is arranged toward the detection module, and the central portion and the light guiding portion are formed on the incident surface.

5. The lens assembly according to claim 1, characterized in that The lens assembly further includes a shell, the detection module is assembled in the shell, and the detection module further includes a plurality of receiving components located around the plurality of light-emitting components.

6. The lens assembly according to claim 5, characterized in that The distance between the central axis of the detection chip and the central axis of the receiving element close to the detection chip is in the range of 3-5 mm.

7. The lens assembly according to claim 5, characterized in that It also includes a shading member, which is arranged between the outer sides of the plurality of light-emitting components and the inner sides of the plurality of receiving members, one end of the shading member abuts against the shell, and the other end of the shading member abuts against the lens.

8. The lens assembly according to claim 5, characterized in that The central axis of the detection chip and the central axis of the central portion corresponding to the detection chip are not in a straight line, and the central axis of the detection chip is closer to the receiving element than the central axis of the central portion corresponding to the detection chip.

9. The lens assembly according to claim 1, wherein: The setting range is 0-2 mm.

10. The lens assembly according to claim 1, wherein: The focal length of the lens is in the range of 0.1-4 mm; and / or The lens comprises a Fresnel lens.

11. A wearable device, characterized in that: The wearable device comprises the lens assembly as claimed in any one of claims 1 to 10 above.

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