Heart rate module isolation lens and wearable electronic device

Abstract

The application discloses a heart rate module isolation lens and a wearable electronic device. The application can be applied to different wearable electronic devices with integrated heart rate detection function. The light emitting lens and the light receiving lens of the heart rate module isolation lens have an injection molding corridor, which can form a small injection molding area and meet the design requirements of a small heart rate lens isolation module. The first end side of the injection molding corridor is connected with a first position on the outer peripheral surface of the light emitting lens, the second end side is connected with a second position on the outer peripheral surface of the light receiving lens, and the body length of the injection molding corridor forming the light transmission path is greater than the distance between the first position and the second position in the first direction. As an injection molding process structure, the light transmission path constructed based on the injection molding corridor is lengthened, the light conduction attenuation is enhanced, and the optical crosstalk is reduced.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of electronic devices, and in particular to a wearable electronic device and a heart rate module isolation lens. BACKGROUND

[0002] Motion health related technologies on wearable products have become a development trend, and heart rate as a key basic feature has almost become a standard. Currently, the heart rate detection of wearable products mainly uses a reflective optical PPG (Photo Plethysmo Graph) detection scheme, that is, the heart rate is detected by the change of reflected light intensity after the light beam irradiates the skin surface. When the heart contracts, the peripheral blood volume is the largest, the light absorption is the largest, and the detected light intensity is the smallest; while the heart relaxes, the detected light intensity is the largest, so that the light intensity received by the light receiver presents pulsatile changes, and then the heart rate is calculated through signal processing. In order to widely realize scientific motion monitoring and health management, the heart rate measurement feature is loaded on small size wearable products such as earphones.

[0003] Based on the space limitation of small size wearable products, the optical isolation design of the heart rate module becomes particularly important. In a typical isolation and lens integrated injection molding scheme in the prior art, the process connecting structure between the two lenses after molding forms a light channel, the light channel has a large amount of light, which directly affects the heart rate signal quality and accuracy due to the increase of the noise floor. SUMMARY

[0004] Embodiments of the present application provide a wearable electronic device and a heart rate module isolation lens, which can effectively reduce the optical crosstalk of the integrated injection molded lens through structural optimization, and provide good technical support for improving the optical signal-to-noise ratio of the heart rate detection assembly on the basis of reducing the noise floor.

[0005] The first aspect of the embodiment of the present application provides a heart rate module isolation lens, which comprises an isolation body arranged between a light emitting lens and a light receiving lens in a first direction; and an injection molding corridor between the light emitting lens and the light receiving lens. Based on the arrangement of the injection molding corridor, a small range injection molding area can be formed relative to the lens body structure, so that the lens has a basis for different form designs, thereby meeting the design requirements of a small heart rate lens isolation module. The first end side of the injection molding corridor is connected to a first position on the outer peripheral surface of the light emitting lens, the second end side is connected to a second position on the outer peripheral surface of the light receiving lens, and the body length of the injection molding corridor forming the light transmission path is greater than the distance between the first position and the second position in the first direction. As an injection molding process structure, the light transmission path constructed by the injection molding corridor is lengthened, and the light conduction attenuation through the process structure is enhanced, thereby reducing the optical crosstalk between the light emitting and the light receiving. Thus, based on the reduction of the noise floor, the optical signal-to-noise ratio of the heart rate detection assembly is effectively improved. Overall, a high-performance, small heart rate lens isolation module design can be achieved.

[0006] Based on the first aspect, the first embodiment of the first aspect is provided in the embodiments of the present application: from the first end side to the second end side, the injection molding corridor comprises a body arranged in a bent shape.

[0007] Exemplarily, the body arranged in a bent shape of the injection molding corridor comprises at least three straight sections connected vertically in sequence, which can simplify the design of the process spacer used in the two-color injection molding process, and facilitate the configuration of the process spacer. It has the characteristics of simple structure and good processability. Based on normalized energy simulation, under the condition that the received effective signal is the same, the injection molding corridor bending design can reduce the internal crosstalk light energy and effectively improve the optical signal-to-noise ratio. Thus, on the basis of effectively reducing the optical crosstalk, the process cost can be further reduced.

[0008] In other specific implementations, the body arranged in a bent shape of the injection molding corridor can comprise a plurality of arc segments connected in sequence, which can also lengthen the light transmission path formed based on the process structure.

[0009] Based on the first embodiment of the first aspect, the embodiment of the present application also provides a second embodiment of the first aspect: the first position and the second position are respectively located on the lateral peripheral surfaces of the light-emitting lens and the light-receiving lens, that is, the other peripheral surfaces except the opposite side surfaces; a transition straight segment is formed by extending along the first direction among at least three straight segments vertically connected in sequence, and the transition straight segment has a first surface close to the light-emitting lens, and the light-emitting lens has a second surface close to the transition straight segment, and the first surface is arranged away from the light-emitting lens, and the distance between the second surface and the first surface is h≥0; in this way, the light-emitting surface of the light-emitting module is at least aligned with the transition straight segment adjacent to the light-transmitting direction, or staggered, so that the actual required light turning path is further increased, that is, the conditions for forming optical crosstalk are more stringent, and the light forming the crosstalk based on the transition straight segment is greatly reduced, thereby effectively controlling the amount of crosstalk.

[0010] Based on the first aspect, the embodiment of the present application also provides a third implementation of the first aspect: from the first end side to the second end side, the injection molding corridor includes a body arranged in an inclined shape, which can also lengthen the light transmission path formed based on the process structure.

[0011] Exemplarily, the first position and the second position may be located on opposite side peripheral surfaces of the light emitting lens and the light receiving lens, respectively, and the first position and the second position are located on side peripheral surfaces of the light emitting lens and the light receiving lens, respectively.

[0012] Based on the first aspect, or the first embodiment of the first aspect, or the second embodiment of the first aspect, or the third embodiment of the first aspect, the embodiment of the present application also provides a fourth embodiment of the first aspect: the cross-sectional size of the injection-molded corridor is less than 1 mm, which can achieve a better effect of reducing the amount of crosstalk and meet the actual needs of heart rate detection performance in different application scenarios.

[0013] Based on the first aspect, or the first embodiment of the first aspect, or the second embodiment of the first aspect, or the third embodiment of the first aspect, or the fourth embodiment of the first aspect, the embodiment of the present application also provides a fifth embodiment of the first aspect: the surface roughness of the main body of the injection-molded corridor is greater than the surface roughness of the light-emitting lens and the light-receiving lens. For example, but not limited to, the main body surface of the injection-molded corridor is treated with a frosting process to construct a total reflection barrier; in this way, through the optical turning path formed by the injection-molded corridor, after the light reaches the main body surface with higher roughness, the probability of total reflection is greatly reduced, which can further reduce the amount of crosstalk; or, interfering particles may be provided in the main body of the injection-molded corridor, and the refractive index of the material of the interfering particles is different from the refractive index of the material of the injection-molded corridor. The total reflection probability of the optical turning path formed by the injection-molded corridor can also be reduced, further reducing the amount of crosstalk.

[0014] Based on the possible implementation manner of the first aspect, the light emitting lens, the light receiving lens, and the isolation are integrally injection molded, that is, the double-color injection molding process is adopted.

[0015] The second aspect of the embodiment of the present application provides another heart rate module isolation lens, the light emitting lens, the light receiving lens, and the isolation are integrally injection molded, and the isolation at least includes an isolation body located between the light emitting lens and the light receiving lens arranged at intervals along a first direction; a first injection molding lead-out part is arranged at a first position on the outer peripheral surface of the light emitting lens, and a second injection molding lead-out part is arranged at a second position on the outer peripheral surface of the light receiving lens. Based on the first injection molding lead-out part and the second injection molding lead-out part, a small-range injection molding area can be formed with respect to the lens body structure, so that the lens has a basis for different form designs, thereby meeting the design requirements of the miniaturized heart rate lens isolation module. At the same time, the two injection molding lead-out parts are physically separated, and as a process structure meeting the double-color injection molding, the injection molding area lead-out design can reduce the internal crosstalk light energy to zero, completely suppress the internal light crosstalk, and effectively improve the optical signal-to-noise ratio of the heart rate detection assembly. Overall, the high-performance and miniaturized heart rate lens isolation module design can be realized.

[0016] The third aspect of the embodiment of the present application provides an electronic device including a heart rate detection assembly, the heart rate detection assembly including a heart rate module and an isolation lens, wherein the heart rate module includes a light emitting module and a light receiving module arranged at intervals along a first direction, the isolation lens adopts the heart rate module isolation lens as described above, and is configured such that the light emitting lens and the light receiving lens of the heart rate module isolation lens are arranged opposite to the light emitting module and the light receiving module, respectively.

[0017] In specific applications, the heart rate detection assembly can be embedded in the shell of the electronic device, and the outer surfaces of the light emitting lens and the light receiving lens are smoothly transitioned with the outer profile of the shell. For example, but not limited to, a special-shaped curved lens suitable for the skin area can be adopted, so as to avoid the discomfort such as squeezing, rubbing, and swelling, and the user experience is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A schematic diagram of an earphone with a heart rate detection assembly is provided for the embodiment of the present application.

[0019] Figure 2 A schematic diagram of a use state of the heart rate detection assembly is provided for the embodiment of the present application.

[0020] Figure 3 A schematic diagram of a typical heart rate module isolation lens is provided.

[0021] Figure 4 A schematic diagram of a heart rate module isolation lens is provided for the embodiment of the present application.

[0022] Figure 5 For Figure 4 the structure diagram of the lens shown in

[0023] Figure 6 For the heart rate module isolation lens shown in the embodiment of the present application Figure 4

[0024] Figure 7 For the heart rate module isolation lens shown in the comparative example Figure 3

[0025] Figure 8 For the structure diagram of another lens provided by the embodiment of the present application

[0026] Figure 9 For the structure diagram of another lens provided by the embodiment of the present application

[0027] Figure 10 For the structure diagram of another lens provided by the embodiment of the present application

[0028] Figure 11 For the structure diagram of another lens provided by the embodiment of the present application

[0029] Figure 12 For the structure diagram of another heart rate module isolation lens provided by the embodiment of the present application

[0030] Figure 13 For Figure 12 the structure diagram of the lens shown in DETAILED DESCRIPTION

[0031] The embodiment of the present application provides a one-piece injection molded heart rate module isolation lens, which can reduce the influence of internal light crosstalk and meet the functional needs of a high-performance and small-sized heart rate lens isolation PPG module.

[0032] Without loss of generality, the embodiment of the present application takes a headset as a description carrier, and details a PPG heart rate detection scheme applied to a wearable product. Please refer to Figure 1 , which shows a kind of application position schematic diagram of heart rate detection component 100 (PPG module) on headset 200, it should be understood that the setting of PPG module is not limited to the position shown in the figure, and the application position of the heart rate detection component can be selected on the surface position of the ear package of the headset according to the overall design needs of the product, and the application position of the heart rate detection component does not constitute substantial limitation to the heart rate module isolation lens claimed in the present application.

[0033] Please refer to Figure 2 , which shows a kind of use state schematic diagram of the heart rate detection component.

[0034] ​​The heart rate detection assembly 100 comprises a heart rate module 10 and an isolation lens 20, wherein the heart rate module 10 comprises a light emitting module 101 and a light receiving module 102 arranged at intervals, the light emitting module 101 can be a LED (Light Emitting Diode, LED) to emit a detection light, the light receiving module 102 can be a PD (photodiode) to convert a light signal into an electric signal, the LED and the PD are integrated into a heart rate device, and the light receiving module 102 and the light emitting module 101 are electrically connected with a circuit board (not shown in the figure). Correspondingly, the two lenses of the heart rate module isolation lens 20 are oppositely arranged, and along a light transmission direction, the light emitting lens 11 and the light receiving lens 12 of the heart rate module isolation lens 20 are oppositely arranged with the light emitting module 101 and the light receiving module 102 respectively.

[0035] As shown in Figure 2 , the light emitted by the light emitting module 101 is reflected and refracted by the light emitting lens 11 to converge the light to the skin of the measured human body, and the light reflected by the human body skin is reflected and refracted by the light receiving lens 12 and received by the light receiving module 102, and the heart rate is calculated through signal processing and calculation.

[0036] A typical heart rate module isolation lens in the prior art is integrally formed by a double-color injection molding process, please refer to Figure 3 , the light emitting lens 11a and the light receiving lens 12a of the isolation lens have a straight-through material connecting area 13a'. Here, the "double-color injection molding process" refers to injecting two different materials into the same mold, so that the part injected out is formed by two materials.

[0037] However, the straight-through material connecting area has a large structure area of the injection molding process, a large amount of light is transmitted through the channel, and the bottom noise is increased. The bottom noise is the external environmental noise, and the collected bottom noise signal directly affects the light signal-to-noise ratio of the PPG sample signal.

[0038] Based on this, the embodiment of the present application provides a heart rate module isolation lens 20, as shown in Figure 4 and Figure 5 , wherein, Figure 4 shows the heart rate module isolation lens according to an embodiment of the present application, Figure 5 is Figure 4 the overall structure diagram of the lens 1 shown in

[0039] The heart rate module isolation lens 20 comprises a lens 1 and an isolation 2, wherein the light emitting lens 11 and the light receiving lens 12 are arranged at intervals along the first direction X. For the convenience of description, three directions are defined herein with the main body of the light emitting lens 11 and the light receiving lens 12: the first direction X is the arrangement direction of the light emitting lens 11 and the light receiving lens 12 arranged at intervals, the second direction Z is the light transmission direction of the light emitting lens 11 and the light receiving lens 12, and the third direction Y is defined as the third direction different from the first direction X and the second direction Z.

[0040] In this scheme, the lens 1 and the isolation 2 are integrally formed by a two-color injection molding process, and have an injection molding corridor 13 between the light emitting lens 11 and the light receiving lens 12. The injection port of the lens 1 can be arranged on the side of the injection molding corridor 13, and the injection port of the isolation 2 can also be arranged on the side thereof, with a total of two injection ports. Based on the arrangement of the injection molding corridor 13, the light emitting lens 11 and the light receiving lens 12 can be molded by one injection molding, which is beneficial to mass production efficiency. After injection molding, the isolation body 21 of the isolation 2 is located between the light emitting lens 11 and the light receiving lens 12 to isolate the two. There is no assembly gap between the isolation 2 and the lens 1, which strengthens the light isolation effect, while reducing the labor cost of assembly, improving the production efficiency and improving the yield of finished products.

[0041] Based on this process, the isolation 2 in this embodiment adopts a material with different light transmittance from the lens 1, for example but not limited to, a component with PMMA (polymethyl methacrylate) or PC (polycarbonate) as the base material.

[0042] The first end side of the injection molding corridor 13 is connected to the first position A on the outer peripheral surface of the light emitting lens 11, and the second end side of the injection molding corridor 13 is connected to the second position B on the outer peripheral surface of the light receiving lens 12. Based on the arrangement of the injection molding corridor 13, a small range of injection molding area can be constructed relative to the lens body structure, so that the lens has the basis of different morphological designs, which can meet the design requirements of the small heart rate lens isolation module.

[0043] In this embodiment, the body of the injection molding corridor 13 is in a bent shape, and is formed by five straight sections connected in sequence from the first end side to the second end side, wherein the first straight section 131 connected to the light emitting lens 11 is formed by extending from the first position A along the third direction Y; the second straight section 132 is formed by extending from the outer end of the first straight section 131 along the second direction Z; the third straight section 133 connected to the light receiving lens 12 is formed by extending from the second position B along the third direction Y; the fourth straight section 134 is formed by extending from the outer end of the third straight section 133 along the second direction Z; and the transition straight section 135 is connected between the second straight section 132 and the fourth straight section 134.

[0044] The injection molding corridor 13 is bent in X, Y, Z three directions, and the body length of the formed light transmission path is the sum of the lengths of the five straight sections, which is greater than the distance between the first position A and the second position B in the first direction X. Here, the "body length" refers to the size of the injection molding corridor body structure in the actual light transmission path direction. For the structure shown in Figure 5 , the sum of the lengths of the five straight sections is the body length of the light transmission path formed by the injection molding corridor 13. As an injection molding process structure, the light transmission path formed by the injection molding corridor 13 is lengthened, and the light conduction attenuation through the process structure is increased, thereby reducing the amount of optical crosstalk, ensuring the improvement of the sensitivity of the detection and the accuracy of the heart rate monitoring.

[0045] Among them, the outer shape of the light emitting lens 11 and the light receiving lens 12 can be circular, oval, polygonal or other special-shaped profiles, which can be designed according to actual application conditions as long as they meet the basic light transmission function.

[0046] Please see Figure 6 and Figure 7 , among them, Figure 6 is the internal crosstalk schematic diagram of the heart rate module isolation lens described in the embodiment. Based on the bending design of the injection molding corridor 13 in the embodiment, the internal optical crosstalk path of the injection molding process structure is relatively small, which can ensure the passage of the main light source and reduce the penetration of stray light to reduce the interference to the signal path. Figure 7 is the internal crosstalk schematic diagram of the comparative example shown in Figure 3 . The connecting area of the heart rate module isolation lens shown in the comparative example is an injection molding process structure, and the internal optical crosstalk path is relatively large.

[0047] Based on the normalized energy simulation results, under the condition that the received effective signal is the same (all set to 3.8*10 -5 ), Figure 6 the crosstalk light noise of the lens shown in -6 is 1.5*10 Figure 7 The crosstalk light noise of the lens shown in -6 is 8.1*10 , and the injection molding corridor bending design can reduce the internal crosstalk light energy to about 1 / 5 of the comparative example, and effectively improve the optical signal-to-noise ratio by about 5 times.

[0048] In the embodiment, the first position A and the second position B for providing the injection molding corridor connecting area are respectively located on the side peripheral surface of the light emitting lens 11 and the light receiving lens 12, in combination with Figure 5 and Figure 6As shown, the first position A and the second position B are located at the same side of the light emitting lens 11 and the light receiving lens 12. It can be understood that the injection molding corridor 13 and the connection area of the light emitting lens 11 and the light receiving lens 12 can also be located at other peripheral surfaces. In theory, the injection molding corridor 13 with the lengthened light transmission path can also be configured on other peripheral surfaces opposite the side surface in the first direction X. In comparison, the first position A and the second position B are located at the same side of the light emitting lens 11 and the light receiving lens 12, which has better processability.

[0049] Further, as shown in Figure 6 The transition straight section 135 has a first surface 1351 close to the light emitting lens 11, and the light emitting lens 11 has a second surface 111 close to the transition straight section 135, and the first surface 1351 is arranged away from the second surface 1351. Figure 6 As shown in the orientation relationship, the upper surface of the transition straight section 135 is lower than the lower surfaces of the light emitting lens 11 and the light receiving lens 12, that is, the distance between them is h. Here, the distance h between the second surface 111 and the first surface 1351 satisfies: h≥0. In this way, the actual turning path of the light emitted by the LED arranged below the light emitting lens 11 is increased, that is, the condition for forming light crosstalk is more stringent, thereby effectively controlling the amount of crosstalk.

[0050] It can be understood that when h=0, the influence of the light emitted by the light emitting lens 11 on the formation of crosstalk can be avoided. In comparison, when h>0, the condition for forming light crosstalk is more stringent. In other words, in the projection plane parallel to the second direction, as shown in Figure 6 As shown in the figure, the transition straight section 135 formed along the first direction X does not overlap with the light emitting lens 11 and the light receiving lens 12.

[0051] In other specific implementations, in the projection plane parallel to the second direction X, the transition straight section 135 does not overlap with the light emitting lens 11 and the light receiving lens 12, and the above-mentioned limitation on the formation of light crosstalk can be achieved. Taking the LED light emitting surface of the light emitting module as a reference, at least in the light transmission direction (the second direction Z), the upper surface of the adjacent transition straight section 135 is aligned. Of course, the relative distance between the upper surface of the transition straight section 135 and the lower surface of the lens directly affects the condition for forming light crosstalk and the size of the product in the second direction Z. In actual application, the limitation of balancing light crosstalk and the overall design requirement of product miniaturization need to be considered.

[0052] It can be understood that the actual size of the injection corridor 13 shown in the figure and the light emitting lens 11 and the light receiving lens 12 is not limited to the size ratio relationship shown in the figure. In order to further obtain the technical effect of effectively reducing the amount of crosstalk, the smaller the cross-sectional area of the injection corridor 13, the better the effect of reducing the amount of crosstalk, so as to meet the actual needs of the heart rate detection performance in different application scenarios.

[0053] Alternatively, the cross-sectional size of the injection corridor 13 can be less than 1 mm, which can increase the number of reflections on the light transmission path. Based on the design idea of reducing the cross-sectional area to limit the amount of crosstalk, it should be understood that the cross-sectional size refers to the size of the constraint cross-sectional area, for example, for the injection corridor 13 with a circular cross-section, its diameter is less than 1 mm; for the injection corridor 13 with an elliptical cross-section, its long diameter is less than 1 mm; for the injection corridor 13 with a rectangular cross-section, its long side size is less than 1 mm.

[0054] In this embodiment, Figure 5 The injection corridor 13 of the lens shown is bent in X, Y, and Z directions, and is specifically composed of five straight sections. The use of straight section structure can simplify the design of process spacers used in two-color injection molding process, and facilitate the configuration of process spacers. On the basis of effectively reducing optical crosstalk, process cost can be further reduced. In addition, based on the injection corridor composed of straight sections connected in sequence and vertically, the specific bending direction can also include bending in X and Z directions only, or bending in X and Y directions, that is, the case of three straight sections connected in sequence and vertically with two bending points.

[0055] Please refer to Figure 8 , which shows another structure diagram of a lens. In this embodiment, the injection corridor 13a is arranged on the opposite side outer peripheral surface of the light emitting lens 11 and the light receiving lens 12, that is, the first position A and the second position B for providing the injection corridor connection area are respectively located on the opposite side outer peripheral surface of the light emitting lens 11 and the light receiving lens 12. The injection corridor 13a includes bending in X and Z directions, three straight sections connected in sequence and vertically with two bending points, wherein the first straight section 131a connected with the light emitting lens 11 extends along the first direction X from the first position A to form, the second straight section 132a connected with the light receiving lens 12 extends along the first direction X from the second position B to form, and the third straight section 133a is connected between the first straight section 131a and the second straight section 132a and extends along the second direction Z to form.

[0056] Please refer to Figure 9, which shows a structural schematic diagram of still another lens. In this embodiment, the injection molding corridor 13b is arranged on the side outer peripheral surface of the light emitting lens 11 and the light receiving lens 12, and includes X and Y direction bends, three straight sections connected in sequence and vertically, wherein the first straight section 131b connected with the light emitting lens 11 extends from the first position A along the third direction Y to form, the second straight section 132b connected with the light receiving lens 12 extends from the second position B along the third direction Y to form, and the third straight section 133b is connected between the first straight section 131b and the second straight section 132b and extends along the first direction X to form.

[0057] It should be noted that the bend-shaped injection molding corridor 13b (131b, 132b, 133b) formed by the straight sections connected in sequence, the extension direction of each straight section is not limited to completely consistent with the direction corresponding to the diagram, that is, the adjacent two straight sections can also be connected in a non-vertical relative position relationship, and the effective lengthening of the light transmission path can also be achieved.

[0058] In addition, in some specific applications, according to the actual product design requirements, each straight section can also be in the form of a non-equal cross section, rather than being limited to the equal cross section injection molding corridor shown in the diagram. In addition, in other specific applications, the body of the bend-shaped injection molding corridor formed by the straight sections connected in sequence can also include other multiple straight sections.

[0059] In this embodiment, Figure 5 , Figure 8 and Figure 9 The injection molding corridor shown in the diagram is composed of multiple straight sections. In other specific implementations, the body of the bend-shaped injection molding corridor 13c can include multiple arc sections connected in sequence, please refer to Figure 10 , which shows a structural schematic diagram of another lens. The light transmission path formed by the injection molding corridor 13c can also be effectively lengthened.

[0060] The injection molding corridor can also include a body arranged in an inclined shape, please refer to Figure 11 , which shows a structural schematic diagram of still another lens. Here, the injection molding corridor 13d is arranged on the opposite side outer peripheral surface of the light emitting lens 11 and the light receiving lens 12, and the first position A on the light emitting lens 11 and the second position B on the light receiving lens 12 are staggered arranged along the second direction Z. Correspondingly, the body of the injection molding corridor 13d is arranged in an inclined shape from the first end side to the second end side, and can also lengthen the light transmission path formed based on the process structure.

[0061] Further, the embodiments of the present application also provide the following processing mode from the perspective of increasing the light transmission "roadblock".

[0062] One way can be through increasing the body surface roughness of the injection molding corridor. Specifically, the body surface roughness of the injection molding corridor can be greater than the surface roughness of the light emitting lens and the light receiving lens, that is, on the basis of the same injection molding base material, the body surface roughness of the injection molding corridor can be improved by process means to build a total reflection barrier; in this way, through the optical turning path formed by the injection molding corridor, the total reflection probability is greatly reduced after the light reaches the body surface with higher roughness, which can further reduce the amount of cross light. Here, the specific process means for improving the body surface roughness of the injection molding corridor can be selected as needed; for example, but not limited to, by increasing the surface roughness of the injection molding spacer to form a frosted surface, or by removing material after injection molding to increase the surface roughness.

[0063] Another way can be to provide interference particles in the body of the injection molding corridor, the interference particles have a different refractive index than the material of the injection molding corridor. Based on the design of the interference particles, the total reflection probability of the optical turning path formed by the injection molding corridor can also be reduced, further reducing the amount of cross light.

[0064] In specific applications, the above two ways of increasing light transmission barriers can be selected or applied simultaneously to the injection molding corridor.

[0065] As an injection molding process structure, the heart rate module isolation lens is integrally formed by using a two-color injection molding process, and the injection molding process structure of the light emitting lens 11 and the light receiving lens 12 can be independently configured. Please refer to Figure 12 and Figure 13 , wherein, Figure 12 is another schematic diagram of a heart rate module isolation lens provided by the embodiment of the application, Figure 13 is Figure 12 the structure diagram of the lens shown in

[0066] As shown in the figure, the heart rate module isolation lens 20 includes a lens 1 and an isolation 2, wherein the light emitting lens 11 and the light receiving lens 12 are arranged along the first direction X. Based on the two-color injection molding process, the light emitting lens 11 and the light receiving lens 12 are independently configured with an injection molding process structure, wherein the first position A on the outer peripheral surface of the light emitting lens 11 is provided with a first injection molding lead-out part 14, and the second position B on the outer peripheral surface of the light receiving lens 12 is provided with a second injection molding lead-out part 15. Here, based on the first injection molding lead-out part 14 and the second injection molding lead-out part 15, a small range injection molding area can be constructed relative to the lens body structure, which can also meet the design requirements of the small heart rate lens isolation module.

[0067] The two injection molding lead-out parts are physically separated, that is, the injection molding lenses of the LED emission and PD receiving areas are completely separated. The injection molding ports can be located on the first injection molding lead-out part 14, the second injection molding lead-out part 15, and the side plane of the isolation 2, for a total of three injection molding ports. Compared with the structure of setting an injection molding corridor between the lenses mentioned above, this embodiment adds an injection molding port to the process flow. In other words, Figure 12 The light emitting lens 11 and the light receiving lens 12 are each injection molded.

[0068] After injection molding, the isolator 21 of the isolation 2 is located between the light emitting lens 11 and the light receiving lens 12, isolating the two. The isolation between the LED emission and PD receiving areas is completely light-tight. This injection-molded area extraction design reduces the internal crosstalk light energy to zero, which can completely suppress internal optical crosstalk.

[0069] In addition to the aforementioned heart rate module isolation lens, the embodiment of the present application also provides a wearable electronic device including a heart rate detection component, the heart rate detection component 100 includes a heart rate module and an isolation lens, the heart rate module includes a light transmitting module and a light receiving module spaced apart along a first direction, the isolation lens can be as described above Figures 4 to 6 as well as Figures 8 to 12 The heart rate module isolation lens described in the specification has a light emitting lens and a light receiving lens arranged opposite to the light emitting module and the light receiving module respectively along the light passing direction to meet the high performance and miniaturization requirements of the wearable electronic device.

[0070] Combine Figure 1 and Figure 2 In the earphones shown, the heart rate detection component 100 is embedded in the shell of the earphones 200. It should be understood that the other functions of the earphones are not the core invention points of this application, so they will not be described in detail herein.

[0071] In order to enhance the user experience, the outer surfaces of the light-emitting lens and the light-receiving lens have a smooth transition with the outer contour of the shell. For example, but not limited to, special-shaped curved lenses adapted to the skin area can be used to avoid discomfort such as squeezing, friction, and swelling, greatly improving the user experience. At the same time, the contact with the skin of the human body being measured is closer and the contact surface is larger, which can further improve the sensitivity of detection and the accuracy of heart rate monitoring.

[0072] It is clear that the heart rate module isolation lens based on the embodiments of this application can be widely used in wearable electronic devices with high-performance and miniaturization requirements to integrate excellent heart rate detection functions. Examples include, but are not limited to, smart watches, headsets, smartphones, or health monitoring devices. The improved optical signal-to-noise ratio of the heart rate detection component can correspondingly enhance the power of penetration detection, resulting in lower power consumption and greater energy conservation for wearable device detection.

[0073] In addition, the earphone shown in the embodiment of the present application is illustratively described by one PPG module, but in actual application, multiple PPGs can be set according to needs, and the heart rate module isolation lens scheme provided by the present application can be used, and the embodiment of the present application is not limited.

[0074] In addition, the heart rate detection assembly 100 shown in the embodiment of the present application is illustratively described by a set of light emitting modules 101 and light emitting lenses 11, a set of light receiving modules 102 and light receiving lenses 12, in other actual applications, the heart rate module isolation lens 20 can be set as multiple groups in one-to-one, or can be set as multiple groups of multiple-to-one of light emission and light receiving.

[0075] The above is only the preferred embodiment of the present application, it should be pointed out that, for those skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A heart rate module isolation mirror, characterized by, The light emitting lens and the light receiving lens are arranged in a first direction, and the spacer is arranged between the light emitting lens and the light receiving lens.

2. The heart rate module isolation lens of claim 1, wherein, The injection molding corridor includes a body arranged in a bending shape from the first end side to the second end side.

3. The heart rate module isolation lens of claim 2, wherein, The body arranged in a bending shape of the injection molding corridor includes at least three straight sections connected in sequence and perpendicularly.

4. The heart rate module isolation lens of claim 3, wherein, The first position and the second position are respectively located on the side outer peripheral surfaces of the light emitting lens and the light receiving lens.

5. The heart rate module isolation lens of claim 2, wherein, The body arranged in a bending shape of the injection molding corridor includes a plurality of arc sections connected in sequence.

6. The heart rate module isolation lens of claim 1, wherein, The injection molding corridor includes a body arranged in an inclined shape from the first end side to the second end side.

7. The heart rate module isolation mirror lens of claim 2, 3, 5, or 6, wherein, The first position and the second position are respectively located on the opposite outer peripheral surfaces of the light emitting lens and the light receiving lens.

8. The heart rate module isolation mirror lens of claim 2, 3, 5, or 6, wherein, The first position and the second position are respectively located on the side outer peripheral surfaces of the light emitting lens and the light receiving lens.

9. The heart rate module isolation lens of any of claims 1-6, wherein, The cross-sectional dimension of the injection molding corridor is less than 1 mm.

10. The heart rate module isolation lens of any of claims 1-6, wherein, The surface roughness of the body of the injection molding corridor is greater than the surface roughness of the light emitting lens and the light receiving lens. Alternatively, the body of the injection molding corridor has interference particles therein, and the material refractive index of the interference particles is different from the material refractive index of the injection molding corridor.

11. The heart rate module isolation lens of any of claims 1-6, wherein, The light emitting lens, the light receiving lens and the spacer are integrally injection molded.

12. A heart rate module isolation mirror lens characterized by, The light emitting lens, the light receiving lens and the spacer are integrally injection molded.

13. A wearable electronic device comprising a heart rate detection component, characterized in that, The heart rate detection assembly includes a heart rate module and a spacer lens, and the heart rate module includes a light emitting module and a light receiving module arranged in a first direction. The isolation lens adopts the heart rate module isolation lens according to any one of claims 1 to 12, and is configured such that the light emitting lens and the light receiving lens of the heart rate module isolation lens are arranged opposite to the light emitting module and the light receiving module, respectively.

14. The wearable electronic device of claim 13, wherein, The heart rate detection component is embedded in the shell of the electronic device, and the outer surfaces of the light emitting lens and the light receiving lens are smoothly transitioned with the outer profile surface of the shell.

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