WO2023011031A1 - Module émetteur de lumière, caméra de profondeur et terminal - Google Patents

Module émetteur de lumière, caméra de profondeur et terminal Download PDF

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Publication number
WO2023011031A1
WO2023011031A1 PCT/CN2022/100524 CN2022100524W WO2023011031A1 WO 2023011031 A1 WO2023011031 A1 WO 2023011031A1 CN 2022100524 W CN2022100524 W CN 2022100524W WO 2023011031 A1 WO2023011031 A1 WO 2023011031A1
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WO
WIPO (PCT)
Prior art keywords
light
emitting
optical element
emitting unit
depth camera
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PCT/CN2022/100524
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English (en)
Chinese (zh)
Inventor
刘海亮
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Oppo广东移动通信有限公司
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Publication of WO2023011031A1 publication Critical patent/WO2023011031A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
    • G02B27/4205—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant

Definitions

  • the present application relates to the technical field of distance measurement, and more specifically, to a light emitting module, a depth camera and a terminal.
  • Time of flight (ToF) technology is a technology that calculates the distance between the object and the sensor by measuring the time difference between the transmitted signal and the signal reflected by the object.
  • a typical TOF structure includes a transmitter module (Tx) and a receiver module (Rx).
  • Tx transmitter module
  • Rx receiver module
  • the beam splitting grating used by the transmitter module (Tx) has a period in two directions and is a two-dimensional orthogonal grating. There are only two copying directions along the axis, so it is necessary to use a positive direction or a rectangular light source surface to cover the entire projection space, which limits the arrangement of the light source lattice to a certain extent, and leads to significant distortion of the spot area, wasting part of the spot energy.
  • Embodiments of the present application provide a light emitting module, a depth camera, and a terminal.
  • Embodiments of the present application provide a light emitting module.
  • the light emitting module includes a light source and a first optical element.
  • the light source includes a plurality of light-emitting unit arrays, each of which is in the shape of a regular hexagon, and each of the light-emitting unit arrays includes a plurality of light-emitting points and is used for emitting dotted light.
  • the first optical element is used to receive the lattice light, and respectively reproduce and project the lattice light along the first direction, the second direction and the third direction, the first direction, the second direction and the The third directions are all different.
  • the embodiments of the present application also provide a depth camera.
  • the depth camera includes a light emitting module and a light receiving module.
  • the light emitting module is used to emit light
  • the light receiving module is used to receive at least part of the light reflected back by the object and form an electrical signal.
  • the light emitting module includes a light source and a first optical element.
  • the light source includes a plurality of light-emitting unit arrays, each of which is in the shape of a regular hexagon, and each of the light-emitting unit arrays includes a plurality of light-emitting points and is used for emitting dotted light.
  • the first optical element is used to receive the lattice light, and respectively reproduce and project the lattice light along the first direction, the second direction and the third direction, the first direction, the second direction and the The third directions are all different.
  • the embodiments of the present application also provide a terminal.
  • the terminal includes a housing and a depth camera.
  • the depth camera is combined with the casing.
  • the depth camera includes a light emitting module and a light receiving module.
  • the light emitting module is used to emit light
  • the light receiving module is used to receive at least part of the light reflected by the object and form an electrical signal.
  • the light emitting module includes a light source and a first optical element.
  • the light source includes a plurality of light-emitting unit arrays, each of which is in the shape of a regular hexagon, and each of the light-emitting unit arrays includes a plurality of light-emitting points and is used for emitting dotted light.
  • the first optical element is used to receive the lattice light, and respectively reproduce and project the lattice light along the first direction, the second direction and the third direction, the first direction, the second direction and the The third directions are all different.
  • Fig. 1 is a schematic structural diagram of a light emitting module in some embodiments of the present application.
  • Fig. 2 is a schematic structural diagram of the light source of the light emitting module in some embodiments of the present application
  • Fig. 3 is a schematic diagram of the projection of the light emitting module in some embodiments of the present application.
  • FIGS. 4 to 6 are schematic structural views of the light emitting unit array of the light emitting module in some embodiments of the present application.
  • Fig. 7 is a schematic structural diagram of the light source part of the light emitting module in some embodiments of the present application.
  • Fig. 8 is a schematic diagram of the projection of the light emitting module in some embodiments of the present application and the projection of the transmitting end in the flight technology in the prior art;
  • Fig. 9 is a schematic structural diagram of the first optical element of the light emitting module in some embodiments of the present application.
  • Fig. 14 is a schematic structural diagram of a depth camera in some embodiments of the present application.
  • Fig. 15 is a schematic structural diagram of a terminal in some embodiments of the present application.
  • a first feature being "on” or “under” a second feature may mean that the first and second features are in direct contact, or that the first and second features are indirect through an intermediary. touch.
  • “above”, “above” and “above” the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.
  • “Below”, “beneath” and “beneath” the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.
  • Embodiments of the present application provide a light emitting module.
  • the light emitting module includes a light source and a first optical element.
  • the light source includes multiple light-emitting unit arrays, each light-emitting unit array is in the shape of a regular hexagon, and each light-emitting unit array includes a plurality of light-emitting points, and is used to emit dotted light.
  • the first optical element is used for receiving the dot matrix light, and respectively duplicating and projecting the dot matrix light along the first direction, the second direction and the third direction, and the first direction, the second direction and the third direction are all different.
  • the light-emitting unit array includes: a plurality of first light-emitting points arranged on the edge of the light-emitting unit array, and all the first light-emitting points in each light-emitting unit array can form a regular hexagon.
  • the two adjacent light-emitting unit arrays share the first light-emitting point located at the overlapping portion of the edges.
  • the array of light-emitting units includes a second light-emitting point, and the second light-emitting point is disposed inside a regular hexagon surrounded by a plurality of first light-emitting points.
  • the second light-emitting point is set at the exact center of the regular hexagon.
  • the first optical element includes a substrate and a microstructure, and the microstructure is disposed on the substrate.
  • the microstructures are arranged on the substrate along the first direction, the second direction and the third direction, so that the lattice light can be replicated and projected in the first direction, the second direction and the third direction after entering the microstructures.
  • the first optical element includes at least one of a diffractive optical element and a planar phase lens.
  • the light emitting module further includes a second optical element, the second optical element is arranged between the light source and the first optical element, and the second optical element is used to receive the dotted light and guide the dotted light to the first optical element.
  • the second optical element includes at least one of a refractive lens group and a phase lens.
  • the phase lens is a planar phase lens, and the phase microstructure of the phase lens includes nano microstructures.
  • the phase lens is a Fresnel lens
  • the phase microstructure of the phase lens includes an annular Fresnel microstructure.
  • the present application also provides a depth camera.
  • the depth camera includes a light emitting module and a light receiving module.
  • the light emitting module is used to emit light
  • the light receiving module is used to receive at least part of the light reflected by the object and form an electrical signal.
  • the light emitting module includes a light source and a first optical element.
  • the light source includes multiple light-emitting unit arrays, each light-emitting unit array is in the shape of a regular hexagon, and each light-emitting unit array includes a plurality of light-emitting points, and is used to emit dotted light.
  • the first optical element is used for receiving the dot matrix light, and respectively duplicating and projecting the dot matrix light along the first direction, the second direction and the third direction, and the first direction, the second direction and the third direction are all different.
  • the light-emitting unit array includes: a plurality of first light-emitting points arranged on the edge of the light-emitting unit array, and all the first light-emitting points in each light-emitting unit array can form a regular hexagon.
  • the two adjacent light-emitting unit arrays share the first light-emitting point located at the overlapping portion of the edges.
  • the array of light-emitting units includes a second light-emitting point, and the second light-emitting point is disposed inside a regular hexagon surrounded by a plurality of first light-emitting points.
  • the second light-emitting point is set at the exact center of the regular hexagon.
  • the first optical element includes a substrate and a microstructure, and the microstructure is disposed on the substrate.
  • the microstructures are arranged on the substrate along the first direction, the second direction and the third direction, so that the lattice light can be replicated and projected in the first direction, the second direction and the third direction after entering the microstructures.
  • the first optical element includes at least one of a diffractive optical element and a planar phase lens.
  • the light emitting module further includes a second optical element, the second optical element is arranged between the light source and the first optical element, and the second optical element is used to receive the dotted light and guide the dotted light to the first optical element.
  • the second optical element includes at least one of a refractive lens group and a phase lens.
  • the phase lens is a planar phase lens, and the phase microstructure of the phase lens includes nano microstructures.
  • the phase lens is a Fresnel lens
  • the phase microstructure of the phase lens includes an annular Fresnel microstructure.
  • the present application also provides a terminal.
  • the terminal includes a casing and the depth camera described in any one of the foregoing implementation manners, and the depth camera is combined with the casing.
  • Time of flight (ToF) technology is a technology that calculates the distance between the object and the sensor by measuring the time difference between the transmitted signal and the signal reflected by the object.
  • a typical TOF structure includes a transmitter module (Tx) and a receiver module (Rx).
  • the transmitter module the laser light emitted by the light source passes through a collimator and a diffraction optical element (Diffractive Optical Element, DOE), or The quasi-diameter and diffuser are projected on the object in the form of speckle or flood light, and the diffuse reflection light of speckle or flood light is received by the receiver module to complete the collection of depth signals.
  • DOE diffractive Optical Element
  • the luminous points in the light source of the transmitting end in the time-of-flight technology are arranged in a rectangle, and the diffractive optical element can only replicate and project the point rays emitted by the luminous points along two orthogonal directions.
  • a larger diffraction order is required, which will reduce the performance of the transmitting end (such as efficiency and uniformity, etc.).
  • an embodiment of the present application provides a light emitting module 10 .
  • the light emitting module 10 includes a light source 11 and a first optical element 12 .
  • the light source 11 includes a plurality of light-emitting unit arrays 111, each light-emitting unit array 111 is in the shape of a regular hexagon, each light-emitting unit array 111 includes a plurality of light-emitting points 1110, and is used for emitting dot light.
  • the first optical element 12 is used to receive the lattice light, and respectively replicate and project the lattice light along the first direction x, the second direction y and the third direction g, the first direction x, the second direction y and the third direction g All are different.
  • the emission module 10 is provided with a regular hexagonal light-emitting unit array 111 and a first optical element 12 capable of replicating and projecting the dot light emitted by the light-emitting unit array 111 in three different directions.
  • the projected light can cover the entire projection space, and the distribution of speckle (point light rays emitted from the light-emitting point) with less distortion can be obtained, and the utilization of speckle (point light rays emitted from the light-emitting point) can be improved.
  • the diffractive optical element can only copy and project the point light emitted by the light-emitting point along two orthogonal directions, at the same diffraction order Under this setting, more speckles (point rays emitted by the luminous point) can be obtained, so that while ensuring the performance of the light emission module 10, it is beneficial to improve the measurement accuracy of the depth camera 100 (as shown in FIG. 14 ). Spend.
  • the light emitting module 10 includes a light source 11 and a first optical element 12 .
  • the light source 11 includes a plurality of light emitting unit arrays 111, and each light emitting unit array 111 is in the shape of a regular hexagon.
  • Each light-emitting unit array 111 includes a plurality of light-emitting points 1110, and each light-emitting point 1110 can emit point light.
  • the light-emitting unit array 111 composed of such a plurality of light-emitting points 1110 can emit dotted light.
  • each light-emitting unit array 111 is a regular hexagon, which means that the edges of each light-emitting unit array 111 are regular hexagons. Since the shape of each light-emitting unit array 111 in the light source 11 is a regular hexagon, when the first optical element 12 replicates and projects the dot light emitted by the light-emitting unit array 111 as a primitive, it can cover the entire projection space. , which meets the application requirements of time-of-flight technology and is beneficial to subsequent processing.
  • each light-emitting unit array 111 in the light source 11 is the same, that is, the shape of each light-emitting unit array 111 is a regular hexagon with the same size, so that the light-emitting unit array 111 in the first optical element 12 When the emitted dot matrix light is copied and projected for the primitive, it can further fill the entire projection space.
  • the size of the light emitting unit array 111 may also be different in some embodiments.
  • the arrangement of the light-emitting points 1110 inside each light-emitting unit array 111 may be the same or different, and there is no limitation here.
  • the light-emitting unit array 111 includes a plurality of first light-emitting points 1111 , and the first light-emitting points 1111 are disposed on the edge of the light-emitting unit array 111 .
  • All the first light-emitting points 1111 in each light-emitting unit array 111 can enclose a regular hexagon.
  • a plurality of first light-emitting points 1111 are located at vertices of a regular hexagon.
  • a plurality of first light-emitting points 1111 are located on sides of a regular hexagon.
  • the vertices and sides of the regular hexagon may also be provided with first light-emitting points 1111 , which is not limited here.
  • adjacent light-emitting unit arrays 111 when the edges of two adjacent light-emitting unit arrays 111 overlap, the adjacent two light-emitting unit arrays 111 share the first light-emitting point 1111 located at the overlapping portion. . In this way, adjacent light-emitting unit arrays 111 can be connected more closely. For example, as shown in FIG. 7, the light-emitting unit array 111a (the light-emitting unit array on the upper left side in FIG. 7) partially overlaps with the light-emitting unit array 111b (the light-emitting unit array 111 on the lower left side in FIG.
  • the unit array 111b shares the first light-emitting point 1111a and the first light-emitting point 1111b located at the overlapping portion of the edge; the light-emitting unit array 111a (the light-emitting unit array on the upper left side in FIG. array) are partially overlapped, and the light-emitting unit array 111a and the light-emitting unit array 111c share the first light-emitting point 1111a and the first light-emitting point 1111d located at the overlapping part of the edge; the light-emitting unit array 111b (the light-emitting unit array on the lower left side in FIG.
  • the cell array 111c (the light-emitting cell array on the right side in FIG.
  • the light-emitting cell array 111b and the light-emitting cell array 111c share the first light-emitting point 1111a and the first light-emitting point 1111c located at the overlapping portion of the edge.
  • the first light-emitting point 1111a belongs to both the light-emitting point in the light-emitting unit array 111a, the light-emitting point in the light-emitting array 111b, and the light-emitting point in the light-emitting array 111c; the first light-emitting point 1111b belongs to both the light-emitting unit
  • the light-emitting points in the array 111a also belong to the light-emitting points in the light-emitting array 111b;
  • the first light-emitting point 1111c belongs to both the light-emitting points in the light-emitting unit array 111c and the light-emitting points in the light-emitting array 111b;
  • the first light-emitting point 1111d belongs to both The light-emitting points in the light-emitting unit array 111b belong to the light-emitting points in the light-emitting array 111a.
  • the light-emitting unit array 111 may further include a second light-emitting point 1112 , and the second light-emitting point 1112 is disposed inside a regular hexagon surrounded by a plurality of first light-emitting points 1111 .
  • the edge of the light-emitting unit array 111 can be kept in a regular hexagon.
  • the first optical element 12 uses the lattice light emitted by the light-emitting unit array 111 When duplicating and projecting, the entire projection space can be covered; on the other hand, since the light-emitting unit array 111 is also provided with a second light-emitting point 1112, the number of light-emitting points in the light-emitting unit array 111 is increased so that the light source 11 can project More point rays are beneficial to improve the accuracy of the distance measurement of the depth camera (shown in Figure 14). It should be noted that the number of the second light-emitting points 1112 in each light-emitting unit array 111 may be one, two, three or even more, which is not limited here.
  • the second light-emitting point 1112 is set at the exact center inside the regular hexagon.
  • all the first light-emitting points 1111 in each light-emitting unit array 111 can form a regular hexagon, and the first light-reflecting points 1111 are all arranged at vertices of the regular hexagon.
  • Each light-emitting unit array 111 is also provided with a second light-emitting point 1112, and the second light-emitting point 1112 is arranged at the exact center inside the regular hexagon.
  • the distances from the second light-emitting point 1112 in each light-emitting unit array 111 to all the first light-emitting points 1111 in the same light-emitting unit array 111 are the same.
  • the distribution of light-emitting points 1110 can be made more uniform, which is conducive to improving the depth of the camera ( Figure 14 Shown) the accuracy of distance measurement.
  • multiple different regular hexagonal light emitting unit arrays 111 can also be combined in the multiple light emitting points 1110 of the light source 11 . For example, as shown in FIG.
  • the light-emitting points 1110a, 1110b, 1110c, 1110d, 1110e, and 1110f may form a hexagonal first light-emitting unit array 111A.
  • the light-emitting point 1110a, the light-emitting point 1110b, the light-emitting point 1110c, the light-emitting point 1110d, the light-emitting point 1110e, and the light-emitting point 1110f all serve as the first light-emitting point 1111 on the edge of the first light-emitting unit array 111A, and are located in the regular hexagon.
  • the light-emitting point 1110g of the first light-emitting unit array 111A is used as the second light-emitting point 1112 of the first light-emitting unit array 111A.
  • the light-emitting point 1110a, the light-emitting point 1110c, the light-emitting point 1110g, the light-emitting point 1110h, the light-emitting point 1110i, and the light-emitting point 1110J can form a hexagonal second light-emitting unit array 111B.
  • the light-emitting point 1110a, the light-emitting point 1110c, the light-emitting point 1110g, the light-emitting point 1110h, the light-emitting point 1110i, and the light-emitting point 1110J are all located in the regular hexagon as the first light-emitting point 1111 on the edge of the second light-emitting unit array 111B.
  • the light-emitting point 1110b of the second light-emitting unit array 111B is used as the second light-emitting point 1112 of the second light-emitting unit array 111B.
  • the first optical element 12 is used to receive the dot matrix light emitted by the light emitting unit array 111 in the light source 11, and copy and project the light along the first direction x, the second direction y and the third direction g respectively.
  • the first direction x, the second direction y and the third direction g are all different.
  • the shape of the light-emitting unit array 111 is a regular hexagon (that is, the edge of the lattice light projected by the light-emitting unit array 111 is also a regular hexagon), and the first optical element 12 can direct the lattice light projected by the light-emitting unit array 111 along three In this way, the projected light can cover the entire projection space, and the distribution of speckle (point light) with less distortion can be obtained, and the utilization rate of speckle (point light) can be improved.
  • the diffractive optical element can only copy and project the point light emitted by the light-emitting point along two orthogonal directions, and the array of light-emitting units is arranged in a rectangle.
  • the first optical element 12 in this embodiment that is, the point rays emitted by the light-emitting point can be replicated and projected in three different directions
  • the left side is the light emitting end in the prior art
  • the right side is the light emitting module 10 in this embodiment.
  • the light emitting end can project 9 parts, but the light emitting module 10 in this embodiment can project 13 parts. Therefore, under the same diffraction order setting, the light emitting module 10 in this embodiment can obtain more speckle (point light rays emitted from the light-emitting point), so that the performance of the light emitting module 10 can be ensured. At the same time, it is beneficial to improve the measurement accuracy of the depth camera 100 (as shown in FIG. 14 ).
  • the included angles between any two adjacent directions of the first direction x, the second direction y and the third direction g are the same.
  • the included angle between any two adjacent directions in the first direction x, the second direction y and the third direction g may also be different, which is not limited here.
  • the first optical element 12 faces the same light-emitting unit array 111 along two adjacent directions (such as the first direction x and the second direction y; or the first direction x and the third direction g; or When the second direction y and the third direction g) are copied, a cross-diffraction phenomenon will be generated to form and project a lattice light, and the lattice light can fill in between the lattice light formed by copying along two adjacent directions .
  • the projected light rays can be further made to cover the entire projection space, so as to obtain a distribution of speckles (point rays) with less distortion, and improve the utilization rate of speckles (point rays).
  • the regular hexagon with the solid line shown in FIG. 3 is a schematic diagram of the dot matrix light that the first optical element 12 replicates and projects from the same light-emitting unit array 111; the regular hexagon with a dotted line in FIG. 3 is the first optical element. 12
  • Schematic diagram of the dot matrix rays formed and projected due to the cross-diffraction phenomenon during replication It can be understood that the dot matrix light formed and projected due to the cross-diffraction phenomenon fills in between the dot matrix light that is duplicated and projected from the same light-emitting unit array 111 by the first optical element 12 .
  • the first optical element 12 includes a substrate 121 and a microstructure 122 disposed on the substrate 121 . More specifically, in some embodiments, the microstructures 122 are arranged on the substrate 121 along the first direction x, the second direction y, and the third direction g, so that the lattice light can travel to the first direction after entering the microstructures 122.
  • the direction x, the second direction y and the third direction g are respectively copied and projected. It should be noted that, in some embodiments, the structure of each microstructure 122 may be completely the same or different, which is not limited here.
  • the first optical element 12 may be at least one of a diffractive optical element (DOE) and a planar phase lens.
  • DOE diffractive optical element
  • the first optical element 12 is a diffractive optical element
  • the microstructure 122 of the first optical element 12 may include a plurality of micro-steps.
  • the number of micro-steps can be two steps, three steps, four steps or even more, which is not limited here.
  • the first optical element 12 adopts a diffractive optical element intersecting with the planar phase lens, which can reduce light
  • the fabrication and design of the emission module 10 are difficult, and the cost of manufacturing the light emission module 10 is reduced.
  • the first optical element 12 may also be a planar phase lens, and in this case, the microstructure 122 of the first optical element 12 may include a nano-microstructure.
  • the light emitting module 10 further includes a second optical element 13 , and the third optical element 13 is disposed between the light source 11 and the first optical element 12 .
  • the second optical element 12 is used to receive the dotted light and guide the dotted light to the first optical element 12 . Since the light emitted by the light source 11 is generally divergent, the second optical element 13 can collimate the light after receiving the lattice light, so that the light incident on the first optical element 12 is collimated light, which is beneficial to the first The optical element 12 replicates and projects the dot light.
  • the second optical element 13 may include at least one of a refractive lens and a phase adjustment lens.
  • the second optical element 13 may be a refractive lens group.
  • the refraction lens group may include one or more refraction lenses, which is not limited here.
  • the second optical element 13 may be a phase lens.
  • the second optical element 13 can also be other optical elements, which is not limited here, as long as the second optical element 13 can collimate the light and guide the collimated light to the first optical element 12. .
  • the second optical element 13 when the second optical element 13 is a phase lens, the second optical element 13 includes a substrate 131 and a phase microstructure 132 disposed on the substrate 131 .
  • the base 131 includes a first surface 1311 and a second surface 1312 opposite to each other, and the first surface 1311 is closer to the light source 11 than the second surface 1312 .
  • the phase microstructure 132 is disposed on the first surface 1311 and/or the second surface 1312 , and the phase microstructure 132 is used to adjust the phase of the light emitted from the second optical element 13 to the first optical element 12 .
  • the phase microstructure 132 is arranged on the first surface 1311 of the substrate 131; or, the phase microstructure 132 is arranged on the second surface 1312 of the substrate 131; or, the first surface 1311 and the second surface of the substrate 131 Each surface 1312 is provided with a phase microstructure 132 .
  • the phase microlens may be a planar phase lens, that is, the second optical element 13 is a planar phase lens, and at this time, the phase microstructure 132 includes a nanoscale microstructure. Since the manufacturing difficulty of the plane phase lens is lower than that of the Fresnel lens, the second optical element 13 in this embodiment can reduce the processing difficulty of the second optical element 13 compared with the use of the plane phase lens. , thereby reducing the processing difficulty of the light emitting module 10 . It should be noted that when the first optical element 12 is a planar phase lens and the second optical element 13 is also a planar phase lens, the shape, arrangement and number of nanostructures on the two planar phase lenses may be different.
  • the nano-microstructure on the planar phase lens as the first optical element 12 is set to be able to replicate and project lattice light in three different directions, and the nano-microstructure on the planar phase lens as the second optical element 13 is set to Able to collimate light.
  • the phase microlens can be a Fresnel lens, that is, the second optical element 13 is a Fresnel lens, and at this time, the second optical element 13 includes an annular Fresnel microstructure . Since the design difficulty of the current Fresnel lens is lower than that of the planar phase lens, the second optical element 13 in this embodiment can reduce the design of the second optical element 13 compared with the planar phase lens. Difficulty, thereby reducing the design difficulty of the light emitting module 10 .
  • the microstructure 122 can also be designed through the first optical element 12, so that the first optical element 12 can realize the functions of collimating light, copying and projecting light at the same time.
  • the light emitting module 10 includes a light source 11 and a first optical element 12, a plurality of light emitting unit arrays 111 (described in Figure 2) in the light source 11 are used to emit dotted light, the first optical The element 12 is used to collimate the received lattice light and reproduce and project it in three different directions. In this way, there is no need to arrange the second optical element 13 to collimate the light rays of the dot matrix, and while maintaining the optical effect, the volume and manufacturing cost of the light emitting module 10 can also be reduced.
  • the embodiment of the present application also provides a depth camera 100 .
  • the depth camera 100 includes a light receiving module 20 and the light emitting module 10 described in any one of the above embodiments.
  • the light emitting module 10 is used to emit light
  • the light receiving module 20 is used to receive at least part of the light reflected back by the object and form an electrical signal.
  • the depth camera 100 obtains the depth information of the object according to the electrical signal formed by the light receiving module 10 .
  • the depth camera 100 is configured by setting a regular hexagonal light-emitting unit array 111 in the light-emitting module 10, and setting the first dot matrix light emitted by the light-emitting unit array 111 to replicate and project in three different directions.
  • the projected light can cover the entire projection space, and the distribution of speckle (point light rays emitted from the light-emitting point) with less distortion can be obtained, and the utilization of speckle (point light rays emitted from the light-emitting point) can be improved.
  • the diffractive optical element can only copy and project the point light emitted by the light-emitting point along two orthogonal directions, at the same diffraction order Under this setting, more speckles (point rays emitted by the light-emitting points) can be obtained, so as to ensure the performance of the light emitting module 10 and help improve the measurement accuracy of the depth camera 100 .
  • the embodiment of the present application further provides a terminal 1000 .
  • the terminal 1000 includes a casing 200 and the depth camera 100 described in any one of the above embodiments, and the depth camera 100 is combined with the casing 200 .
  • the terminal 1000 may be a mobile phone, a computer, a tablet computer, a smart watch, a smart wearable device, etc., which is not limited here.
  • the terminal 100 is provided with a regular hexagonal light-emitting unit array 111 in the light-emitting module 10, and a first optical element capable of replicating and projecting the lattice light emitted by the light-emitting unit array 111 in three different directions 12.
  • the projected light can cover the entire projection space, and the distribution of speckle (point light rays emitted from the light-emitting point) with less distortion can be obtained, and the utilization of speckle (point light rays emitted from the light-emitting point) can be improved.
  • the diffractive optical element can only copy and project the point light emitted by the light-emitting point along two orthogonal directions, at the same diffraction order Under this setting, more speckles (point rays emitted by the light-emitting points) can be obtained, so as to ensure the performance of the light emitting module 10 and help improve the measurement accuracy of the depth camera 100 .
  • references to the terms “certain embodiments,” “one embodiment,” “some embodiments,” “exemplary embodiments,” “examples,” “specific examples,” or “some examples” To describe means that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
  • first and second are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features.
  • the features defined as “first” and “second” may explicitly or implicitly include at least one of said features.
  • the meaning of “plurality” is at least two, such as two, three, unless otherwise clearly and specifically defined.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Optics & Photonics (AREA)
  • Measurement Of Optical Distance (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

La présente invention concerne un module émetteur de lumière (10), un module de profondeur (100) et un terminal (1000). Le module émetteur de lumière (10) comprend une source de lumière (11) et un premier élément optique (12). La source de lumière (11) comprend une pluralité de réseaux d'unités émettrices de lumière (111) dans un hexagone régulier. Chaque réseau d'unités émettrices de lumière (111) comprend une pluralité de points émetteurs de lumière (1110) et sert à émettre une lumière de matrice de points. Le premier élément optique (12) sert à recevoir la lumière de matrice de points et, respectivement, à répliquer et projeter la lumière de matrice de points dans une première direction (x), une deuxième direction (y) et une troisième direction (g), la première direction (x), la deuxième direction et la troisième direction étant différentes.
PCT/CN2022/100524 2021-08-06 2022-06-22 Module émetteur de lumière, caméra de profondeur et terminal WO2023011031A1 (fr)

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