Structured light transmitting device and structured light transmitting and receiving system

Abstract

The utility model provides a structured light emitting device and a structured light transmitting and receiving system. The structured light emitting device comprises a first shell, a second shell and a light source, the light source array is arranged at the lower end of the cavity of the first shell; the super lens is arranged at the upper end of the cavity of the first shell; the super lens comprises a substrate and a micro-nano structure, a structural surface of the micro-nano structure is arranged on the substrate, and a protective layer is also arranged on the substrate; the height of the micro-nano structure relative to the structural surface is equal to or smaller than the height of the protective layer relative to the structural surface; the super lens is parallel to the light source array; after light emitted by the light source array enters the super lens, the light is copied into structured light by the super lens. The structured light emitting device provided by the utility model is low in assembly difficulty.

Description

Technical Field

[0001] The present application relates to the field of lenses, and in particular to a structured light emitting device and a structured light transmitting and receiving system. Background Art

[0002] In the fields of depth sensing and three-dimensional imaging, it is often necessary to project structured light onto a target object, then collect the light reflected by the target object and perform imaging to obtain an image containing depth information, and then reconstruct the three-dimensional shape of the target object based on the image containing depth information. The structured light emitting device provided by the related art has the defect of being difficult to assemble. Utility Model Content

[0003] One purpose of the present application is to provide a structured light emitting device and a structured light transmitting and receiving system. The structured light emitting device provided in the present application is easy to assemble.

[0004] According to one aspect of an embodiment of the present application, a structured light emitting device is disclosed, the structured light emitting device comprising: a first shell that penetrates from top to bottom; a light source array disposed at the lower end of the cavity of the first shell; a super lens disposed at the upper end of the cavity of the first shell;

[0005] The superlens comprises a substrate and a micro-nano structure; a structural surface of the micro-nano structure is provided on the substrate, and a protective layer is also provided; a height of the micro-nano structure relative to the structural surface is equal to or less than a height of the protective layer relative to the structural surface;

[0006] The super lens is parallel to the light source array; after the light emitted by the light source array is incident on the super lens, it is replicated as structured light by the super lens.

[0007] In an exemplary embodiment of the present application, each sub-light source in the light source array is a vertical cavity surface laser emitter.

[0008] In an exemplary embodiment of the present application, the sub-light sources in the light source array are in a pseudo-random distribution state or a regular distribution state.

[0009] In an exemplary embodiment of the present application, the structure surface faces the light source array, or faces away from the light source array.

[0010] In an exemplary embodiment of the present application, an annular groove is provided at the upper end of the inner wall of the first shell; the super lens is supported by the annular groove.

[0011] In an exemplary embodiment of the present application, the structured light emitting device further includes: a housing substrate;

[0012] The first shell and the light source array are disposed on the same surface of the shell substrate.

[0013] In an exemplary embodiment of the present application, the first housing includes: a first portion located at the lower end; a second portion located at the upper end;

[0014] Wherein, the light source array is disposed in the cavity of the first part of the first shell, and the super lens is disposed in the cavity of the second part of the first shell;

[0015] With respect to the first shell, a projection of an outer edge of the second portion on an upper surface of the first portion is located inside a region surrounded by an outer edge of the upper surface of the first portion;

[0016] With respect to the first shell, the cavity cross-sectional area of ​​the first portion thereof is greater than the cavity cross-sectional area of ​​the second portion thereof.

[0017] According to one aspect of an embodiment of the present application, a structured light transmitting and receiving system is disclosed, and the structured light transmitting and receiving system includes: a structured light transmitting device as provided in any of the above embodiments; an imaging device;

[0018] The imaging device comprises: a second shell that penetrates from top to bottom; an imaging lens disposed at the upper end of the cavity of the second shell; and an image sensor disposed at the lower end of the cavity of the second shell;

[0019] The coverage range of the structured light emitted by the structured light emitting device overlaps with the field of view range of the imaging device, at least within the working distance range.

[0020] In an exemplary embodiment of the present application, the imaging lens includes at least two refractive lenses, or includes at least one super lens.

[0021] In an exemplary embodiment of the present application, the second housing includes: a first portion located at the lower end; a second portion located at the upper end;

[0022] Wherein, the imaging lens is disposed in the cavity of the first part of the second shell, and the image sensor is disposed in the cavity of the second part of the second shell;

[0023] For the second shell, the projection of the outer edge of the second part on the upper surface of the first part is located inside the area surrounded by the outer edge of the first part;

[0024] With respect to the second shell, the cavity cross-sectional area of ​​the first portion thereof is greater than the cavity cross-sectional area of ​​the second portion thereof.

[0025] In an exemplary embodiment of the present application, the structured light transmitting and receiving system further includes: a housing substrate;

[0026] The first housing, the light source array, the second housing and the image sensor are disposed on the same surface of the housing substrate.

[0027] In an exemplary embodiment of the present application, the first portion of the first shell and the first portion of the second shell are an integrated structure.

[0028] The structured light emitting device provided in the embodiment of the present application includes: a first shell that runs through from top to bottom; a light source array disposed at the lower end of the cavity of the first shell; a super lens disposed at the upper end of the cavity of the first shell; wherein the super lens includes a substrate and a micro-nano structure; a structural surface of the micro-nano structure is provided on the substrate, and a protective layer is also provided; the height of the micro-nano structure relative to the structural surface is equal to or less than the height of the protective layer relative to the structural surface; the super lens is parallel to the light source array; after the light emitted by the light source array is incident on the super lens, it is copied into structured light by the super lens. It can be seen that in the structured light emitting device provided in the present application, the optical element for modulating the light only needs a super lens, and under the action of the protective layer, the structural safety of the micro-nano structure on the super lens is improved. Therefore, compared with the structured light emitting device provided in the related art, the structured light emitting device provided in the present application reduces the assembly requirements, thereby further reducing the difficulty of assembly.

[0029] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0030] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

[0032] Figure 1 A three-dimensional side view of a structured light emitting device in an embodiment of the present application is shown.

[0033] Figure 2 A cross-sectional view of a structured light emitting device in an embodiment of the present application is shown.

[0034] Figure 3 A cross-sectional view of a structured light emitting device in an embodiment of the present application is shown.

[0035] Figure 4 A schematic diagram showing the modulation effect exerted by the metalens in the present application on the light emitted by a single sub-light source.

[0036] Figure 5 A schematic diagram showing the modulation effect exerted by the metalens in the present application on the light emitted by multiple sub-light sources.

[0037] Figure 6 A schematic structural diagram of a structured light emitting device in an embodiment of the present application when the structured surface faces the light source array is shown.

[0038] Figure 7 A schematic structural diagram of a structured light emitting device in an embodiment of the present application is shown when the structured surface faces away from the light source array.

[0039] Figure 8 A schematic diagram of light intensity distribution of a single VCSEL light source in an embodiment of the present application is shown.

[0040] Fig. 9 A schematic diagram showing the arrangement of a light source array inside a structured light emitting device in an embodiment of the present application is shown.

[0041] Fig.10 Shows Fig. 9 A schematic diagram of a dot matrix light spot obtained by projecting the obtained structured light on the light beam observation surface after the super lens inside the structured light emitting device in the embodiment replicates the light emitted by the light source array.

[0042] Fig.11 A three-dimensional side view of a structured light transmitting and receiving system in one embodiment of the present application is shown.

[0043] Fig.12 A cross-sectional view of a structured light transmitting and receiving system in one embodiment of the present application is shown.

[0044] Fig.13 A schematic diagram of structured light emission and reception in an embodiment of the present application is shown. Description of the drawings:

[0046] 11-light source array; 12-shell substrate; 13-superlens; 131-substrate of superlens; 132-micro-nano structure of superlens; 14-first shell; 15-imaging lens; 151-first refractive lens; 152-second refractive lens; 153-third refractive lens; 16-color filter; 17-image sensor; 18-second shell; 2-target object. DETAILED DESCRIPTION

[0047] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of the present application will be more comprehensive and complete and the concepts of the example embodiments will be fully conveyed to those skilled in the art. The accompanying drawings are only schematic illustrations of the present application and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

[0048] In addition, the described features, structures or characteristics may be combined in one or more example embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the example embodiments of the present application. However, those skilled in the art will appreciate that the technical solution of the present application may be practiced while omitting one or more of the specific details, or other modules, components, etc. may be adopted. In other cases, known structures, methods, implementations or operations are not shown or described in detail to avoid obscuring the present application and making the various aspects of the present application unclear.

[0049] The structured light emitting device provided by the related technology has two optional designs for the components used to modulate light: one is to use a collimating lens group and a diffractive optical element DOE (Diffractive Optical Element) to modulate the structured light; the other is to use a single-chip super lens to modulate the structured light.

[0050] When a collimating lens group and a diffractive optical element are used to modulate the structured light, the structured light emitting device provided by the related art includes at least: a light source array; a collimating lens group (including a plurality of collimating lenses); a diffractive optical element; and a structural housing. With the structural housing fixed, the collimating lens group is disposed above the light source array, and the diffractive optical element is disposed above the collimating lens group; thus, the light emitted by the light source array with a certain divergence angle is first collimated into parallel light by the collimating lens group, and then replicated and expanded by the diffractive optical element, so as to be projected outward to obtain structured light with a large divergence angle.

[0051] When assembling a structured light emitting device using this design, in addition to the light source array, the relative positions of multiple optical elements (multiple collimating lenses + 1 diffractive optical element) need to be strictly controlled. Since the assembly requirements for the relative positions of the optical elements are high, this method will make the assembly of the structured light emitting device more difficult.

[0052] When a design corresponding to structured light is obtained by modulating a single metalens, the structured light emitting device provided by the related art includes at least: a light source array; a metalens; and a structural housing. With the structural housing fixed, the metalens is arranged above the light source array; thus, the light emitted by the light source array with a certain emission angle is copied by the metalens into structured light projected outward.

[0053] When assembling a structured light emitting device using this design, although only the position of the metalens needs to be strictly controlled except for the light source array, if the micro-nano structure on the metalens is exposed, the micro-nano structure may collide with other components (e.g., the gripping components used in assembly; the structural housing) during the assembly of the structured light emitting device, thereby causing damage to the micro-nano structure. Therefore, in order to reduce the risk of damage to the micro-nano structure, when assembling a structured light emitting device using this design, the position stability and position accuracy of each component in the device are required to be high, which will also make the assembly of the structured light device more difficult.

[0054] From the above, it can be seen that the structured light emitting device provided by the related art has the defect of being difficult to assemble.

[0055] In order to overcome the above-mentioned defects in the related art, the present application provides a structured light emitting device with low assembly difficulty.

[0056] Figure 1 A three-dimensional side view of a structured light emitting device in an embodiment of the present application is shown. Figure 2 A cross-sectional view of a structured light emitting device in an embodiment of the present application is shown. Figure 3 A cross-sectional view of a structured light emitting device in another embodiment of the present application is shown.

[0057] See also Figures 1 to 3 The structured light emitting device provided in the present application includes: a first shell 14 that penetrates from top to bottom; a light source array 11 disposed at the lower end of the cavity of the first shell 14; and a super lens 13 disposed at the upper end of the cavity of the first shell 14.

[0058] It can be understood that the light source array 11 can be fixed to the lower end of the cavity of the first shell 14 by matching its own edge with the specific structure of the lower end of the inner wall of the first shell 14, or by means of a support plate, a bracket, glue dispensing or other optional methods. Similarly, the super lens 13 can be fixed to the upper end of the cavity of the first shell 14 by matching its own edge with the specific structure of the upper end of the inner wall of the first shell 14, or by means of a support plate, a bracket, glue dispensing or other optional methods.

[0059] In the present application, the light source array 11 includes a plurality of sub-light sources that are arranged regularly or pseudo-randomly, so that the light emitted by the light source array 11 can project a dot matrix light spot. When the sub-light sources are arranged regularly, the dot matrix light spots projected by the light emitted by the light source array 11 can form a corresponding regular pattern; when the sub-light sources are arranged pseudo-randomly, the dot matrix light spots projected by the light emitted by the light source array 11 can form a corresponding random pattern.

[0060] In the present application, the superlens 13 includes a substrate 131 and a micro-nano structure 132. The surface of the substrate on which the micro-nano structure 132 is provided is recorded as a structural surface. As described above, in the process of assembling the structured light emitting device, if the micro-nano structure 132 is directly exposed to the outside, it may collide with other components (for example: the grabbing component used during assembly; the first shell 14), thereby causing damage to the micro-nano structure 132. Therefore, in the present application, in addition to the micro-nano structure 132, a protective layer 133 is also provided on the structural surface (the protective layer 133 can be provided by filling the working band transparent material between the micro-nano structures 132 and the periphery of the micro-nano structure 132); the height of the micro-nano structure 132 relative to the structural surface is equal to or less than the height of the protective layer 133 relative to the structural surface, so that the protective layer 133 can prevent the micro-nano structure 132 from being directly exposed to the outside, thereby improving the structural safety of the micro-nano structure 132. It can be understood that after the structural safety of the micro-nano structure 132 is improved, the assembly requirements can be reduced accordingly, thereby further reducing the assembly difficulty of the structured light emitting device.

[0061] Furthermore, after the structured light emitting device is assembled, in a complex use environment, there are also risk factors (such as human touch; object touch) that may damage the structural safety of the micro-nano structure 132. Therefore, by providing the protective layer 133, the use safety of the micro-nano structure 132 can be further improved after the structured light emitting device is assembled.

[0062] In the present application, the superlens 13 is parallel to the light source array 11, and the phase provided by the superlens 13 for the light emitted by the light source array 11 is equivalent to the superposition of the collimation phase and the replication expansion phase. Therefore, after the light emitted by the light source array 11 is incident on the superlens 13, it is replicated by the superlens 13 into structured light with a large divergence angle.

[0063] It can be seen that in the structured light emitting device provided by the present application, the optical element for modulating light only needs the metalens 13, and under the action of the protective layer 133, the structural safety of the micro-nanostructure 132 on the metalens 13 is improved. Therefore, compared with the structured light emitting device provided by the related art using the first design method, the structured light emitting device provided by the present application reduces the assembly requirements for the relative positions between the optical elements, thereby reducing the assembly difficulty of the structured light emitting device; compared with the structured light emitting device provided by the related art using the second design method, the structured light emitting device provided by the present application reduces the assembly requirements for the position stability and position accuracy of each component in the device, thereby further reducing the assembly difficulty of the structured light emitting device.

[0064] Figure 4A schematic diagram showing the modulation effect exerted by the super lens 13 in the present application on the light emitted by a single sub-light source is shown. Figure 5 A schematic diagram showing the modulation effect exerted by the super lens 13 in the present application on the light emitted by multiple sub-light sources.

[0065] See also Figure 4 In the structured light emitting device provided in the present application, for a single sub-light source in the light source array 11, the superlens 13 is equivalent to collimating the light emitted by the sub-light source and then replicating it into multiple beams of light transmitted in different directions.

[0066] In the present application, the replicated light beam corresponding to the same sub-light source is divided into multiple orders according to the deflection angle of the replicated light beam relative to the metalens 13. Specifically, for the replicated light beam of the same sub-light source, the order division can be performed in the following manner: the replicated light beam with the smallest deflection angle relative to the metalens 13 is divided into a first-order light beam; the replicated light beam with a deflection angle only higher than the first-order light beam is divided into a second-order light beam; the replicated light beam with a deflection angle only higher than the first-order light beam and the second-order light beam is divided into a third-order light beam; and so on, each replicated light beam is divided into orders.

[0067] Therefore, it can be understood that the light emitted by each sub-light source in the light source array 11 is replicated into multi-order light beams by the super lens 13. Therefore, the same-order light beams with the same deflection direction corresponding to all sub-light sources together form a replication block; the light spot pattern projected by each replication block can be regarded as a replication of the pattern formed by all sub-light sources in the light source array 11.

[0068] For details, see Figure 5 In the structured light emitting device provided in the present application, from the perspective of a two-dimensional cross-sectional plane along the optical axis, the first-order light beams of all sub-light sources together form a replica block R1, the second-order light beams deflected to the left together form a replica block R2a, the second-order light beams deflected to the right together form a replica block R2b, the third-order light beams deflected to the left together form a replica block R3a, and the third-order light beams deflected to the right together form a replica block R3b.

[0069] The replica block R1 is located at the center, the replica blocks R2a and R2b are located at the secondary center, and the replica blocks R3a and R3b are located at the secondary secondary center; and the replica blocks R2a and R2b are adjacent to the replica block R1, the replica block R3a is adjacent to the replica block R2a, and the replica block R3b is adjacent to the replica block R2b.

[0070] The light spot pattern projected by each of the replica blocks R1 , R2a , R2b , R3a , and R3b can be regarded as a replica of the pattern formed by all the sub-light sources in the light source array 11 .

[0071] In one embodiment, each sub-light source in the light source array 11 is a vertical cavity surface laser (VCSEL).

[0072] In one embodiment, the sub-light sources in the light source array 11 are regularly distributed.

[0073] In one embodiment, the sub-light sources in the light source array 11 are in a pseudo-random distribution state.

[0074] In one embodiment, the structure surface can face the light source array 11 or face away from the light source array 11. Preferably, the structure surface faces away from the light source array 11, thereby reducing the total length of the system composed of the light source array 11 and the optical element for modulating light, thereby reducing the volume of the structured light emitting device.

[0075] In detail, Figure 6 A schematic structural diagram of a structured light emitting device in an embodiment of the present application is shown when the structured surface faces the light source array 11 . Figure 7 A schematic structural diagram of a structured light emitting device in an embodiment of the present application is shown when the structured surface faces away from the light source array 11 .

[0076] See also Figure 6 , when the structural surface faces the light source array 11, the total length T of the system composed of the light source array 11 and the optical element for modulating light can be expressed by the following formula:

[0077] T=d+t

[0078] Wherein, d is the distance from the lower surface of the super lens 13 to the light source array 11. Figure 6 In the illustrated embodiment, the lower surface of the superlens 13 is the structural surface (since the height of the micro-nano structure is extremely small, the thickness of the structural surface can be ignored); t is the thickness of the substrate 131 of the superlens 13.

[0079] See also Figure 7 , when the structural surface faces away from the light source array 11, the total length T' of the system composed of the light source array 11 and the optical element for modulating light can be expressed by the following formula:

[0080] T'=d'+t

[0081] Wherein, d' is also the distance from the lower surface of the super lens 13 to the light source array 11, except that Figure 7 In the illustrated embodiment, the lower surface of the superlens 13 is the opposite surface of the structural surface; t is also the thickness of the substrate 131 of the superlens 13 .

[0082] The substrate 131 is a parallel plate with a certain refractive index n, so according to the method of paraxial parallel plate equivalence in geometric optics, it can be known that the substrate 131 will introduce an axial displacement t / n. Therefore, it can be seen that:

[0083] d'=dt / n

[0084] From this we can further deduce the following relationship:

[0085] T'=dt / n+t=Tt / n

[0086] It can be seen that T' is smaller than T; that is, compared with the structure surface facing the light source array 11, the structure surface facing away from the light source array 11 can reduce the total length of the system composed of the light source array 11 and the optical element for modulating light, thereby reducing the volume of the structured light emitting device.

[0087] It should be noted that when the structured light emitting device needs to be used in devices such as mobile phones that have strict requirements on module size, it is necessary to strictly control the size of the effective area where the micro-nano structure 132 is located so that the size of the superlens 13 matches the divergence angle of the light emitted by the light source array 11, while trying to avoid the size of the structured light emitting device exceeding the limitations of the equipment.

[0088] For this purpose, see Figure 6 , when the structure surface faces the light source array 11, the size of the effective area where the micro-nano structure 132 is located can be controlled by the following formula:

[0089] b=a+2d*tanθ

[0090] Among them, b is the size of the effective area where the micro-nano structure 132 is located, a is the size of the light source array 11, d is the distance from the structure surface to the light source array 11, and θ is the divergence angle (half angle) of the light emitted by a single sub-light source in the light source array 11.

[0091] It can be understood that after determining the size of the light source array 11, the thickness of the substrate 131, the refractive index of the substrate 131, and the divergence angle of the light emitted by a single sub-light source, it can be calculated to obtain the value to which the size of the effective area where the micro-nano structure 132 is located should be controlled when the structure surface is facing away from the light source array 11. Therefore, the formula for controlling the size of the effective area where the micro-nano structure 132 is located when the structure surface is facing away from the light source array 11 is not repeated here.

[0092] It should be noted that when controlling the size of the effective area where the micro-nano structure 132 is located, the selection criteria for the divergence angle of the light emitted by a single sub-light source in the light source array 11 can be adjusted according to actual application requirements.

[0093] In detail, Figure 8 FIG. 2 shows a schematic diagram of the light intensity distribution of a single VCSEL light source in an embodiment of the present application. Figure 8 In one embodiment, if the selection criterion for the divergence angle of the light emitted by a single sub-light source is determined as the divergence angle corresponding to the normalized light intensity of 0.2, then in this embodiment, the divergence angle (half-angle) of the light emitted by this single VCSEL light source is 12.5°. Furthermore, under the premise of meeting the module size requirements of the device, in order to increase the received energy, the normalized light intensity used to determine the divergence angle in the selection criterion can be appropriately reduced, and then the divergence angle is determined according to the adjusted selection criterion. For example: if the normalized light intensity used to determine the divergence angle in the selection criterion is reduced from 0.2 to 0.05, the divergence angle (half-angle) of the light emitted by this single VCSEL light source will be increased from 12.5° to 15°.

[0094] See also Figure 2 and Figure 3 In one embodiment, an annular groove is provided at the upper end of the inner wall of the first shell 14; thus, the super lens 13 is supported on the annular groove. In this way, the super lens 13 can be easily and accurately fixed to the upper end of the cavity of the first shell 14.

[0095] In one embodiment, the structured light emitting device provided in the present application operates in the infrared band; that is, the light emitted by the light source array 11 is infrared light, the base 131 and the protective layer of the superlens 13 are transparent in the infrared band, and the micro-nano structure 132 modulates the infrared light.

[0096] When each sub-light source in the light source array 11 is a VCSEL light source, considering that the VCSEL light source usually operates in a narrowband near-infrared band (for example, operating in a narrowband band with a central wavelength of 940nm), therefore, in this case, the structured light emitting device operates in a narrowband near-infrared band.

[0097] In one embodiment, the structured light emitting device provided by the present application further includes a housing substrate 12 . Therefore, the first housing 14 and the light source array 11 are disposed on the same surface of the housing substrate 12 .

[0098] In one embodiment, the first shell 14 includes: a first portion located at the lower end; and a second portion located at the upper end.

[0099] In this embodiment, the light source array 11 is disposed in the cavity of the first portion of the first shell 14 , and the super lens 13 is disposed in the cavity of the second portion of the first shell 14 .

[0100] Furthermore, for the first shell 14, the projection of the outer edge of the second part on the upper surface of the first part is located inside the area surrounded by the outer edge of the upper surface of the first part. That is, the first shell 14 is thin at the top and thick at the bottom - the first part of the first shell 14 is thick and the second part is thin.

[0101] Since the first shell 14 is thin at the top and thick at the bottom, the first part of the first shell 14 can be provided with a cavity with a larger width than the second part of the first shell 14, under the premise that the wall thickness of each part of the first shell 14 can have sufficient supporting force. Therefore, for the first shell 14, the cross-sectional area of ​​the cavity of the first part is greater than the cross-sectional area of ​​the cavity of the second part. In this way, it is convenient to set various electronic devices (for example, power supply devices and drive devices of the light source array 11) in the cavity of the first part of the first shell 14.

[0102] Fig. 9 A schematic diagram showing the arrangement of the light source array 11 inside the structured light emitting device in one embodiment of the present application is shown. Fig.10 Shows Fig. 9 A schematic diagram of a dot matrix light spot obtained by projecting the obtained structured light on the light beam observation surface after the super lens 13 inside the structured light emitting device in the embodiment replicates the light emitted by the light source array 11.

[0103] See also Figures 9 and 10 In one embodiment, the light source array 11 inside the structured light emitting device is a VCSEL light source array, and the wavelength band of the light emitted by it is 940±4nm. The sub-light sources in the light source array 11 are in a pseudo-random distribution state; and the effective light emitting area of ​​the light source array 11 is 633μm*268μm.

[0104] In this embodiment, the focal length corresponding to the collimated phase provided by the super lens 13 inside the structured light emitting device is 2.7 mm, and the thickness of the substrate 131 thereof is less than or equal to 0.725 mm.

[0105] If the structural surface of the metalens 13 is placed facing the light source array 11, the distance between the structural surface and the light source array 11 is 2.7 mm; combined with the thickness of the substrate 131 being less than or equal to 0.725 mm, it can be seen that the total length of the system composed of the light source array 11 and the optical element for modulating light is less than or equal to 3.425 mm. In this case, the minimum size of the effective area where the micro-nano structure 132 is located is 2.1 mm*1.7 mm; if the effective area where the micro-nano structure 132 is located is a square, the minimum size of the effective area where the micro-nano structure 132 is located is 2.1 mm*2.1 mm.

[0106] If the structural surface of the super lens 13 is placed with its back to the light source array 11, the distance between the structural surface and the light source array 11 is 2.475 mm; combined with the thickness of the substrate 131 being less than or equal to 0.725 mm, it can be seen that the total length of the system composed of the light source array 11 and the optical element for modulating light is less than or equal to 3.2 mm. Similarly, in this case, the minimum size of the effective area where the micro-nano structure 132 is located is 2.1 mm*1.7 mm; if the effective area where the micro-nano structure 132 is located is a square, the minimum size of the effective area where the micro-nano structure 132 is located is 2.1 mm*2.1 mm.

[0107] In this embodiment, the superlens 13 uses a 13*5 replication method to replicate the light emitted by the light source array 11 into multiple closely adjacent light beams; these replicated light beams together constitute a structured light with a divergence angle of 80.4°*72.0°.

[0108] A beam observation surface is set at a transmission distance of 1m, and the structured light is projected on the beam observation surface to obtain the following Fig.10 The dotted spot shown. Fig.10 It can be seen that in this embodiment, the dot matrix light spots obtained by structured light projection are densely arranged and relatively uniform, and thus are suitable for three-dimensional space detection with high spatial resolution (for example: face recognition).

[0109] The present application also provides a structured light transmitting and receiving system. Fig.11 A three-dimensional side view of a structured light transmitting and receiving system in one embodiment of the present application is shown. Fig.12 A cross-sectional view of a structured light transmitting and receiving system in one embodiment of the present application is shown. Fig.13 A schematic diagram of structured light emission and reception in an embodiment of the present application is shown.

[0110] See also Figure 11 to Figure 12 The structured light transmitting and receiving system provided in the present application includes: a structured light transmitting device provided in any of the above embodiments; and an imaging device.

[0111] The imaging device includes: a second housing 18 that penetrates from top to bottom; an imaging lens 15 disposed at the upper end of the cavity of the second housing 18; and an image sensor 17 disposed at the lower end of the cavity of the second housing 18. In addition, the coverage range of the structured light emitted by the structured light emitting device overlaps with the field of view range of the imaging device, at least within the working distance range.

[0112] So, see Fig.13 When the target object 2 within the working distance interval is located within the overlapping area, the structured light emitted by the structured light emitting device is first projected onto the target object 2, and then the structured light reflected by the target object 2 is incident on the imaging lens 15, and then the light modulated by the imaging lens 15 is projected onto the image sensor 17, and then the image sensor 17 images the received light.

[0113] It can be understood that after receiving the imaging image, the image processing system electrically connected to the image sensor 17 can analyze the depth information about the surface of the target object 2 based on the imaging image, and then perform three-dimensional reconstruction, face recognition and other processing on the target object 2.

[0114] The working distance interval can be predetermined according to the requirements of specific application scenarios. For example, in a face recognition scenario, the working distance interval can be configured as [0.5m, 1.5m]; in a topographic measurement scenario, the working distance interval can be configured to be greater than 200m.

[0115] In one embodiment, the imaging lens 15 includes at least two refractive lenses, or includes at least one super lens. That is, the imaging lens 15 can be a lens group consisting of multiple refractive lenses, or a super lens, or a lens group consisting of multiple super lenses, or a lens group consisting of at least one refractive lens and at least one super lens.

[0116] See also Fig.12 In one embodiment, the imaging lens 15 is a lens group consisting of three refractive lenses. In order from top to bottom, the three refractive lenses are: a first refractive lens 151, a second refractive lens 152 and a third refractive lens 153.

[0117] In one embodiment, the imaging device further includes: a color filter 16; the color filter 16 is disposed between the imaging lens 15 and the image sensor 17. Therefore, before the light modulated by the imaging lens 15 enters the image sensor 17, the color filter 16 will first filter out other bands other than the working band, thereby preventing the light of other bands from interfering with the structured light of the working band, thereby improving the imaging quality.

[0118] It should be noted that the color filter 16 may be pre-integrated in the image sensor 17 , or may be provided separately from the image sensor 17 when the image sensor 17 is not provided with its own color filter.

[0119] Preferably, in one embodiment, the color filter 16 is attached to the upper surface of the image sensor.

[0120] In one embodiment, the second shell 18 includes: a first portion located at the lower end; and a second portion located at the upper end.

[0121] In this embodiment, the imaging lens 15 is disposed in the cavity of the first portion of the second housing 18 , and the image sensor 17 is disposed in the cavity of the second portion of the second housing 18 .

[0122] Furthermore, for the second shell 18, the projection of the outer edge of the second part on the upper surface of the first part is located inside the area surrounded by the outer edge of the upper surface of the first part. That is, the second shell 18 is thin at the top and thick at the bottom - the first part of the second shell 18 is thick, and the second part is thin.

[0123] Since the second shell 18 is thin at the top and thick at the bottom, the first part of the second shell 18 can be provided with a cavity with a larger width than the second part of the second shell 18, under the premise of ensuring that the wall thickness of each part of the second shell 18 can have sufficient supporting force. Therefore, for the second shell 18, the cross-sectional area of ​​the cavity in the first part is greater than the cross-sectional area of ​​the cavity in the second part. In this way, it is convenient to set various electronic devices (for example, power supply devices and drive devices of the image sensor 17) in the cavity of the first part of the second shell 18.

[0124] In one embodiment, the structured light transmitting and receiving system provided by the present application further includes a housing substrate 12 . Therefore, the first housing 14 , the light source array 11 , the second housing 18 and the image sensor 17 are all disposed on the same surface of the housing substrate 12 .

[0125] In one embodiment, the first portion of the first housing 14 and the first portion of the second housing 18 are an integrated structure. In this way, the structural integration of the structured light transmitting and receiving system is improved.

[0126] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the utility model disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the appended claims.

Claims

1. A structured light emitting device, characterized in that: The structured light emitting device comprises: a first shell that penetrates from top to bottom; a light source array disposed at the lower end of the cavity of the first shell; and a super lens disposed at the upper end of the cavity of the first shell; The metalens comprises a substrate and a micro-nano structure; a structural surface of the micro-nano structure is provided on the substrate, and a protective layer is also provided; a height of the micro-nano structure relative to the structural surface is equal to or less than a height of the protective layer relative to the structural surface; The super lens is parallel to the light source array; after the light emitted by the light source array is incident on the super lens, it is replicated as structured light by the super lens.

2. The structured light emitting device according to claim 1, characterized in that: Each sub-light source in the light source array is a vertical cavity surface laser emitter.

3. The structured light emitting device according to claim 1, characterized in that: The sub-light sources in the light source array are in a pseudo-random distribution state or a regular distribution state.

4. The structured light emitting device according to claim 1, characterized in that: The structure surface faces the light source array, or faces away from the light source array.

5. The structured light emitting device according to claim 1, characterized in that: An annular groove is provided at the upper end of the inner wall of the first shell; the super lens is supported by the annular groove.

6. The structured light emitting device according to claim 1, characterized in that: The structured light emitting device further comprises: a housing substrate; The first shell and the light source array are disposed on the same surface of the shell substrate.

7. The structured light emitting device according to claim 1, characterized in that: The first housing includes: a first portion located at the lower end; a second portion located at the upper end; Wherein, the light source array is disposed in the cavity of the first part of the first shell, and the super lens is disposed in the cavity of the second part of the first shell; With respect to the first shell, a projection of an outer edge of the second portion on an upper surface of the first portion is located inside a region surrounded by an outer edge of the upper surface of the first portion; With respect to the first shell, the cavity cross-sectional area of ​​the first portion thereof is greater than the cavity cross-sectional area of ​​the second portion thereof.

8. A structured light transmitting and receiving system, characterized in that: The structured light transmitting and receiving system comprises: a structured light transmitting device as described in any one of claims 1 to 7; an imaging device; The imaging device comprises: a second shell that penetrates from top to bottom; an imaging lens disposed at the upper end of the cavity of the second shell; and an image sensor disposed at the lower end of the cavity of the second shell; The coverage range of the structured light emitted by the structured light emitting device overlaps with the field of view range of the imaging device, at least within the working distance range.

9. The structured light transmitting and receiving system according to claim 8, characterized in that: The imaging lens includes at least two refractive lenses, or includes at least one super lens.

10. The structured light transmitting and receiving system according to claim 8, characterized in that: The second housing includes: a first portion located at the lower end; a second portion located at the upper end; Wherein, the imaging lens is disposed in the cavity of the first part of the second shell, and the image sensor is disposed in the cavity of the second part of the second shell; For the second shell, the projection of the outer edge of the second part on the upper surface of the first part is located inside the area surrounded by the outer edge of the first part; With respect to the second shell, the cavity cross-sectional area of ​​the first portion thereof is greater than the cavity cross-sectional area of ​​the second portion thereof.

11. The structured light transmitting and receiving system according to claim 8, characterized in that: The structured light transmitting and receiving system further includes: a housing substrate; The first housing, the light source array, the second housing and the image sensor are disposed on the same surface of the housing substrate.

12. The structured light transmitting and receiving system according to claim 11, characterized in that: The first portion of the first shell and the first portion of the second shell are an integrated structure.

Images