CN114173107A - Structured light module and electronic equipment - Google Patents
Structured light module and electronic equipment Download PDFInfo
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- CN114173107A CN114173107A CN202210016035.9A CN202210016035A CN114173107A CN 114173107 A CN114173107 A CN 114173107A CN 202210016035 A CN202210016035 A CN 202210016035A CN 114173107 A CN114173107 A CN 114173107A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/20—Image signal generators
- H04N13/204—Image signal generators using stereoscopic image cameras
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B15/00—Special procedures for taking photographs; Apparatus therefor
- G03B15/02—Illuminating scene
- G03B15/03—Combinations of cameras with lighting apparatus; Flash units
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/30—Transforming light or analogous information into electric information
- H04N5/33—Transforming infrared radiation
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Abstract
The invention discloses a structured light module, which comprises a structured light projector, an infrared receiving camera and a color camera, wherein the structured light projector, the infrared receiving camera and the color camera respectively comprise at least one dimming element, and at least one dimming element is of a super-surface structure. The invention also discloses electronic equipment, and the electronic equipment is provided with the structured light module. The invention adopts the super-surface structure to replace the original traditional dimming element, integrates the functions of other optical elements on the super-surface structure, simplifies the structure of the structured light module, reduces the processing difficulty and cost, and has the characteristics of miniaturization, portability and high resolution.
Description
Technical Field
The invention relates to the field of artificial intelligence, in particular to an ultrathin 3D structured light module based on an optical super surface and electronic equipment.
Background
Artificial intelligence has begun to slowly permeate into people's daily life, and robots, automatic driving, unmanned aerial vehicles, intelligent door locks, people's face payment etc. all have brought a great deal of facilities for our life, and intelligent products will win explosive growth in the future. As the 'eyes' of the machine, visual perception also becomes the most important component of artificial intelligence, wherein the 3D structured light technology is widely applied to the fields of face-brushing payment, security inspection, service robots and the like due to the advantages of high precision, simple and quick calculation, capability of obtaining three-dimensional information of a measured object and the like. Of course, the migration from industrial applications to consumer electronics is also placing higher demands on miniaturization, low cost, and the like of 3D structured light technology.
A common 3D structured light module mainly includes: structured light projectors, infrared receiving cameras, color cameras; the infrared receiving camera receives the structured light projected on the object to be measured, an infrared speckle pattern is obtained through imaging, the speckle pattern is converted through an algorithm to obtain a depth map of the object to be measured, and the color camera receives the visible light reflected by the object to be measured and obtains a color image through imaging. Wherein the structured light projector generally comprises a light source, a collimating mirror, a DOE; the infrared receiving camera generally includes: the device comprises an imaging chip, an infrared narrow-band filter and an imaging lens; color cameras typically include: imaging chip, infrared cut-off filter and imaging lens.
Prior publication No. CN108462774B provides a structured light module, comprising: a light source assembly, a support, and a diffusive optical element; the light source component, the bracket and the diffusion optical element are connected to form a closed cavity. And a structured light module provided in patent application publication No. CN108594460A, including a laser light source, an optical diffraction element, and a protection element sequentially arranged along a laser emission direction; the laser light source is used for emitting first laser; the optical diffraction element diffracts the first laser light into second laser light.
The collimating lens, the imaging lens and the optical diffraction element (or the diffusion optical element) in the prior art are all traditional optical elements, and the optical path of the light beam is changed by regulating the geometric shape or the refractive index of the interface, so that the regulation and the control of the light beam are realized, and the collimating lens, the imaging lens and the optical diffraction element (or the diffusion optical element) are large in size and difficult to integrate; in addition, the structured light projector, the infrared receiving camera and the color camera have more optical elements, the requirement on the assembly precision of each element in actual production is very high, so that the 3D structured light module is difficult to miniaturize as a whole, the processing cost is high, and how to miniaturize and integrate the optical elements and reduce the production cost of the 3D structured light module is a big problem facing at present.
Disclosure of Invention
The invention provides an ultrathin 3D structured light module based on an optical super surface, which replaces the original traditional dimming element with a super surface structure, integrates the functions of other optical elements on the super surface structure, greatly simplifies the structure of the traditional 3D structured light module, reduces the processing difficulty and cost, and has the characteristics of miniaturization, portability and high resolution.
In order to realize the purpose of the invention, the following technical scheme is adopted:
a structured light module comprises a structured light projector, an infrared receiving camera and a color camera, wherein the structured light projector, the infrared receiving camera and the color camera all at least comprise a light adjusting element, and at least one light adjusting element is of a super-surface structure.
The structured light projector, the infrared receiving camera and the color camera all comprise at least one dimming element, and the dimming element in at least one module is of a super-surface structure; similarly, the dimming elements in two or three modules can be all super-surface structures. The super-surface structure is adopted to replace the traditional lens, so that the module can be miniaturized and integrated.
Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.
Optionally, the structured light projector includes a laser light source and a light modulating element located in the light emitted by the laser light source, the light modulating element being a super-surface structure for beam collimation and replication of beam expansion. The super-surface structure here is equivalent to a collimating mirror and DOE (diffractive optical element) in a conventional projector, and has the function of collimating and duplicating a beam expansion.
Optionally, the infrared receiving camera includes an infrared imaging chip and a light-adjusting element located on a light incident side of the infrared imaging chip, and the light-adjusting element is an infrared super-surface structure for converging and filtering light beams. The infrared super-surface structure is equivalent to an infrared imaging lens and an infrared narrow-band filter in a traditional infrared receiving camera, and has the functions of converging and filtering light beams.
Optionally, the color camera includes a visible light imaging chip and a dimming element located on a light incident side of the visible light imaging chip, where the dimming element is a visible light super-surface structure for converging and filtering light beams. The visible light super-surface structure is equivalent to a visible light imaging lens and an infrared cut-off filter in a traditional infrared receiving camera, and has the functions of converging and filtering light beams.
Utilize the effect of two or more optical element of super surface structure integration in this application, reduce optical element quantity in the module, reduced the alignment degree of difficulty between the optical element, and then reduce module processing cost, do benefit to the miniaturization and integrate.
Optionally, a supporting member for fixing the super-surface structure is provided, and the supporting member is a bracket or a glue layer for supporting the super-surface structure. The supporting piece is used for fixing the position of the super-surface structure, and the supporting piece can be an independent bracket or a supporting glue layer formed by watering and fixing.
Optionally, the super-surface structure includes at least one super-surface structure substrate and at least one super-surface structure microstructure surface, and the super-surface structure microstructure surface has a plurality of sub-wavelength microstructure units regularly arranged thereon. By introducing a surface sub-wavelength scale unit structure, a mutation phase is generated, and the phase, amplitude and polarization of an optical field can be regulated and controlled in a two-dimensional plane.
Alternatively, the microstructure elements may be the same or different in size; the sizes of the plurality of sub-wavelength microstructure units are different, and the wavefront is regulated and controlled by changing the sizes or the shapes of the microstructure units; or the sizes of the plurality of sub-wavelength microstructure units are the same, but the inclination angles are different, and the wavefront is regulated and controlled by changing the inclination angles.
Optionally, the super-surface structure includes a substrate of the super-surface structure, and a microstructure surface of the first super-surface structure and a microstructure surface of the second super-surface structure distributed on both sides of the substrate of the super-surface structure.
Preferably, the super-surface structure is a plurality of layers having different functions, each layer including a micro-structured surface of the surface structure and a substrate of the super-surface structure.
Preferably, the substrate of the super-surface structure and the microstructure surface of the super-surface structure are made of deformable materials, and the focal length of the super-surface structure is adjusted according to the deformation.
The invention also provides electronic equipment, which is characterized in that the structured light module is arranged on the electronic equipment.
Compared with the prior art, the invention adopts the super-surface structure to replace the original traditional dimming element, integrates the functions of other optical elements on the super-surface structure, simplifies the structure of the structured light module, reduces the processing difficulty and cost, and has the characteristics of miniaturization, portability and high resolution.
Drawings
Fig. 1 is a schematic view of an ultra-thin 3D structured light module according to the present invention;
fig. 2 is a schematic view of another ultra-thin 3D structured light module according to the present invention;
FIG. 3 is a schematic view of a structured light projector according to the present invention;
FIG. 4 is a schematic view of a super-surface structure in a structured light projector according to the present invention;
FIG. 5 is an elevation view of a super-surface structure provided by the present invention;
FIG. 6 is an elevation view of another alternative super-surface structure provided by the present invention.
FIG. 7 is a schematic view of a super-surface structure in another structured light projector provided by the present invention;
FIG. 8 is a schematic view of a super-surface structure in yet another structured light projector provided by the present invention;
FIG. 9 is a schematic diagram of a super-surface structure in an infrared camera according to the present invention;
FIG. 10 is a schematic view of a super-surface structure in another infrared camera provided by the present invention;
FIG. 11 is a schematic diagram of a super-surface structure of a color camera according to the present invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments disclosed below. The terms "upper", "lower", "left" and "right" as used herein are set forth with reference to the accompanying drawings, and it is understood that the presence of the terms does not limit the scope of the present invention.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The structured light module shown in fig. 1 comprises a structured light projector 1(a), an infrared receiving camera 2(a) and a color camera 3(a), wherein the structured light projector 1(a), the infrared receiving camera 2(a) and the color camera 3(a) each comprise at least one light modulation element, and at least one of the light modulation elements is a super-surface structure. In the three modules of the structured light module, each module has at least one dimming element (lens), and the dimming elements (lenses) in one or more modules can adopt a super-surface structure.
In another embodiment, the structured light projector 1(a) comprises a laser light source 11 and a light modulating element located in the light emission of the laser light source 11, the light modulating element being a super-surface structure 12 for beam collimation and replication of beam expansion. The super-surface structure 12 here corresponds to a collimator and DOE (diffractive optical element) in a conventional projector, and has the function of collimating and replicating a beam.
In another embodiment, the infrared receiving camera 2(a) includes an infrared imaging chip 21 and a dimming element on the light incident side of the infrared imaging chip, the dimming element being an infrared super-surface structure 22 for converging and filtering light beams. The infrared super-surface structure 22 here is equivalent to an infrared imaging lens + an infrared narrow band filter in a conventional infrared receiving camera, and has the functions of converging and filtering light beams.
In another embodiment, the color camera 3(a) includes a visible light imaging chip 31 and a dimming element on the light incident side of the visible light imaging chip 31, the dimming element being a visible light super-surface structure 32 for beam convergence and filtering. The visible light super-surface structure 32 is equivalent to a visible light imaging lens + an infrared cut-off filter in a conventional infrared receiving camera, and has the functions of converging and filtering light beams.
In different embodiments, the dimming element (lens) in one module may have a super-surface structure, or the dimming elements (lenses) in two or three modules may have a super-surface structure.
In the embodiment shown in fig. 1, the structured light projector 1(a), the infrared receiving camera 2(a) and the color camera 3(a) are provided with a super-surface structure therein. The structured light projector 1(a) comprises a laser light source 11, a super-surface structure 12 and a first support 13; the infrared receiving camera 2(a) comprises an infrared imaging chip 21, an infrared super surface structure (infrared super lens) 22 and a second bracket 23; the color camera 3(a) includes a visible light imaging chip 31, a visible light super surface structure (visible light super lens) 32, and a third support 33. The structured light projector 1(a) emits structured light with structural characteristics, the infrared imaging chip 21 receives the structured light projected on an object to be detected, imaging is carried out to obtain an infrared speckle pattern, the speckle pattern is converted through an algorithm to obtain a depth map of the object to be detected, and the visible light imaging chip 31 receives visible light reflected by the object to be detected, and imaging is carried out to obtain a color image. The structured light projector 1(a) comprises a laser light source 11, a super-surface structure 12 and a first support 13, wherein the super-surface structure 12 is fixed on the first support 13 through glue, the laser light source 11 generally comprises a vertical cavity surface emitting laser (vcsel), a horizontal cavity surface emitting laser (hcsel) and the like, a light-emitting surface comprises N randomly distributed light-emitting holes, light emitted by all the light-emitting holes is copied and expanded into M x N (M is more than or equal to 2) uniformly distributed light spots after passing through the super-surface structure 12, namely the finally obtained structured light with characteristic information, and the super-surface structure 12 is equivalent to a collimating mirror and a DOE (diffractive optical element) in the traditional projector and can collimate and copy and expand light beams; the infrared receiving camera 2(a) comprises an infrared imaging chip 21, an infrared super-surface structure (infrared super-lens) 22 and a second support 23, wherein the infrared super-surface structure 22 is fixed on the second support 23 through glue, infrared light reflected by an object passes through the infrared super-surface structure 22 and then is directly focused on the infrared imaging chip 21 to obtain an infrared speckle pattern, and the infrared super-surface structure 22 is equivalent to an infrared imaging lens and an infrared narrow-band optical filter in the traditional infrared receiving camera; the color camera 3(a) comprises a visible light imaging chip 31, a visible light super-surface structure (visible light super-lens) 32 and a third support 33, the visible light super-surface structure 32 is fixed on the third support 33 through glue, the visible light reflected by an object is directly focused on the visible light imaging chip 31 after passing through the visible light super-surface structure 32 to obtain a color image, and the visible light super-surface structure 32 is equivalent to a visible light imaging lens and an infrared cut-off filter in a traditional infrared receiving camera; the number of the optical elements of the single camera is reduced from 3 to two, so that the alignment difficulty between the optical elements is reduced, and the processing cost of the module is reduced; in addition, the super-surface structure 12, the infrared super-surface structure 22 and the visible light super-surface structure 32 are all super-surface structures, the height direction size is very small, the height direction sizes of the structured light projector 1(a), the infrared receiving camera 2(a) and the color camera 3(a) can be made very small, the height of the whole 3D structured light module is greatly reduced, and the miniaturization design of the module is facilitated.
In another specific embodiment, in order to better fix the position of the super-surface structure during assembly, a supporting member for fixing the super-surface structure is provided, and the supporting member is a bracket (such as the bracket in fig. 1) or a glue layer for supporting the super-surface structure. Specifically, as shown in fig. 2, the drawing includes: a structured light projector 1(b), a laser light source 11, a super-surface structure 12, a first support 13; the infrared receiving camera 2(b), the infrared imaging chip 21, the infrared superlens 22 and the second support 23; color camera 3(b), visible light imaging chip 31, visible light superlens 32, third support 33. The first support 13 may be glue (glue layer) for directly attaching the super-surface structure 12 to the laser light source 11, or may be a ring-shaped support, and the distance between the super-surface structure 12 and the laser light source 11 is changed by the height of the ring-shaped support. The second support 23 may be glue, which directly attaches the infrared superlens 22 to the infrared imaging chip 21, or may be a ring-shaped support, and the distance between the infrared superlens 22 and the infrared imaging chip 21 is changed by the height of the ring-shaped support; the third supporting member 33 may be glue, which directly attaches the visible light super lens 32 to the visible light imaging chip 31, or a ring-shaped support, which changes the distance between the visible light super lens 32 and the visible light imaging chip 31 by the height of the ring-shaped support. Compared with the previous scheme, the difference is that the super surface can be directly attached to a light source or an imaging chip, and the super surface production process can be realized by using the production process of a semiconductor chip, so that the super surface can be produced and packaged together with the vcsel or the chip, and the production cost and the volume of the structured light module are greatly reduced.
In another embodiment, the role of one or more optical elements may be integrated on the super-surface structure in place of the conventional dimming elements. A structured light projector as shown in FIG. 3; the figure includes: structured light projector 1(c), laser light source 11, super-surface structure 12, first support 13 and microlens array 14. The laser light source 11 may be a vcsel, an hcsel, etc., and includes N randomly distributed light emitting holes, each light emitting hole corresponds to a microlens, the microlenses form a microlens array 14, light emitted from the laser light source 11 has a certain divergence angle, is collimated into parallel light after passing through the microlens array 14, and is replicated and diffused into structured light after passing through the super-surface structure 12. Compared with the projector in fig. 2, a layer of microlens array 14 is added, the microlens array 14 can be directly processed on the laser light source 11, and in this case, only the diffraction replication function needs to be considered when designing the super-surface structure 12, which simplifies the optical design.
In another embodiment, the super-surface structure comprises at least one super-surface structure substrate and at least one super-surface structure microstructure surface, wherein the super-surface structure microstructure surface is provided with a plurality of sub-wavelength microstructure units which are regularly arranged. A schematic view of a super-surface structure in a structured light projector, as shown in particular in fig. 4; the figure includes a super surface structure 12(a), a micro structure surface 121(a) of the super surface structure, and a substrate 122(a) of the super surface structure; the super surface is based on the generalized Snell's law, through introducing the sub-wavelength scale unit structure of surface, produces the sudden change phase place, can regulate and control phase place, amplitude and the polarization of light field in the two-dimensional plane, and the optical device that designs based on super surface has miniaturized, lightweight, integrated characteristics, and super surface is regarded as a revolutionary technology in the optics field, is expected to thoroughly subvert loaded down with trivial details lens group in traditional optical system, becomes the optical element of next generation mainstream. The microstructure surface 121(a) of the super-surface structure is formed by arranging a plurality of sub-wavelength scale units according to a certain rule, and common materials comprise metals such as copper, aluminum, gold, titanium and the like, or dielectric materials such as silicon, silicon nitride, TiO2, aluminum arsenide and the like; the substrate 122(a) with super-surface structure has high transmittance, and the common materials are: quartz, SiO2, a polymer material, PC, etc., and the present invention is not limited to the materials listed above.
The phases of the super-surface at different positions can be obtained by defining the light field distribution of the input field and the output field, and the required phase distribution can be obtained by adjusting the structure and the distribution of the super-surface units. The design size of the microstructure surface 121(a) of the super-surface structure needs to be larger than the spot area of the laser on the super-surface structure during design, and in addition, the microstructure surface 121(a) of the super-surface structure is preferably attached to the light source direction during production, so that the microstructure surface can be protected during assembly, and the final imaging effect is prevented from being influenced by contact collision, damage or pollution to the microstructure surface.
In another embodiment, the dimensions of the microstructure elements may be the same or different in the super-surface structure.
As shown in fig. 5, the plurality of sub-wavelength microstructure units have different sizes, and the wavefront is controlled by changing the sizes or shapes of the microstructure units; the shape of the microstructure unit is not limited to the rectangular shape shown in fig. 5, and may be various shapes such as a circular shape, a V-shape, an H-shape, and a C-shape. The super-surface structure comprises a super-surface structure 22(a), a micro-structure unit 221(a) of the super-surface structure and a substrate 222(a) of the super-surface structure, wherein sizes of different micro-structure units in the micro-structure unit 221(a) of the super-surface structure are different, the unit size is smaller than a value of a design wavelength lambda, wave front is regulated and controlled by changing the size or the shape of the micro-structure unit 221(a) of the super-surface structure, and the micro-structure units 221(a) of the super-surface structure are distributed on the substrate 222(a) of the super-surface structure according to a certain rule during design.
As shown in fig. 6, the plurality of sub-wavelength microstructure units have the same size but different tilt angles, and the wavefront is controlled by changing the tilt angles. The super-surface structure comprises a super-surface structure 22(b), a micro-structure unit 221(b) of the super-surface structure and a substrate 222(b) of the super-surface structure, wherein the sizes of different micro-structure units in the micro-structure unit 221(b) of the super-surface structure are the same, the unit size is smaller than the value of the design wavelength lambda, but the inclination angles are different, the wave front is regulated and controlled by changing the inclination angle of the micro-structure unit 221(b) of the super-surface structure, and the micro-structure units 221(b) of the super-surface structure are distributed on the substrate 222(b) of the super-surface structure according to a certain rule during design.
In another embodiment, the super-surface structure is a plurality of layers having different functions, each layer comprising a micro-structured surface of the surface structure and a substrate of the super-surface structure. I.e. the super-surface structure has a plurality of layers, each layer having a different effect. Specifically, as shown in fig. 7, the schematic diagram of the super-surface structure in the structured light projector adopts a two-layer super-surface structure, and the diagram includes: a super surface structure 12(b), a first super surface structure microstructure side 121(b1), a first super surface structure substrate 122(b1), a second super surface structure microstructure side 123(b2), a second super surface structure substrate 124(b 2); the difference from fig. 4 is that a super-surface structure is added, wherein the micro-structure surface 122(b1) of the first super-surface structure has the function of collimating the angled light beam emitted from the laser source into parallel light, and the micro-structure surface 123(b2) of the second super-surface structure has the function of expanding and replicating the input parallel light to form structured light, and the super-surface design in this scheme is simpler than that mentioned in fig. 4.
In another embodiment, the two layers of super-surface structures may share the same substrate, and the microstructure surface of the first super-surface structure and the microstructure surface of the second super-surface structure are distributed on both sides of the substrate of the super-surface structures. FIG. 8 is a schematic view of a super-surface structure in yet another structured light projector provided by the present invention; the figure includes: a super-surface structure 121(c), a microstructure surface 122(c) of the first super-surface structure, a substrate 122(c) of the super-surface structure, and a microstructure surface 123(c) of the second super-surface structure; the difference with the two super-surfaces in fig. 7 is that the microstructure planes of the two super-surfaces in this scheme share a substrate.
FIG. 9 shows a super-surface structure of an infrared camera according to the present inventionA schematic diagram of (a); the infrared super-surface structure 22, the microstructure surface 221 of the infrared super-surface structure and the substrate 222 of the infrared super-surface structure are included in the drawing, the function of the infrared super-surface structure 22 is equivalent to that of an infrared imaging lens and an infrared narrow band filter of a traditional infrared camera, the infrared imaging lens is used for focusing infrared light reflected by an object on an imaging chip to enable the camera to output an infrared image, the infrared narrow band filter is used for cutting off light reflected by the object except light with the same wave band as that of a projector to enable the imaging chip to be clearly formed into an infrared speckle pattern, the phase distribution of the microstructure surface 221 of the infrared super-surface structure is designed according to f of an actual equivalent lens, and the general reference formula is as follows:
is the phase value of any point on the super-surface structure, λ corresponds to the laser emission wavelength of the projector, and the substrate 222 of the infrared super-surface structure is generally made of quartz or schottky glass, and is coated with a special film (to let the light of the same wavelength band as the projector pass through, and to cut off the light of other wavelength bands). Of course, in order to collect more light onto the photodiode, a microlens array is attached to the surface of the imaging chip during chip design, and the light collecting function of the microlens array can also be integrated into the infrared super-surface structure 22.
In another embodiment, the substrate of the super-surface structure and the microstructure surface of the super-surface structure are made of deformable materials, and the focal distance of the super-surface structure is adjusted according to the deformation. Specifically, as shown in fig. 10, the infrared super-surface structure 22(c), the microstructure surface 221(c) of the infrared super-surface structure, and the substrate 222(c) of the infrared super-surface structure are included in the drawing, and the difference from fig. 9 is that the microstructure surface 221(c) of the infrared super-surface structure and the substrate 222(c) of the infrared super-surface structure are made of deformable materials, such as graphene, and the deformation amount of the infrared super-surface structure 22 can be adjusted by changing factors such as an external electric field, temperature, pressure, and the like, so that the focal length of the entire infrared super-surface structure 22 is changed, and a focusing effect is achieved, and thus the focal length of the infrared super-surface structure 22 is changed by controlling, so that the infrared camera can clearly image at far and near distances.
FIG. 11 is a schematic diagram of a super-surface structure in a color camera according to the present invention; the figure includes: the visible light super-surface structure 32, the microstructure surface 321 of the visible light super-surface structure and the substrate 322 of the visible light super-surface structure, the visible light super-surface structure 32 is equivalent to a visible light imaging lens and an infrared cut-off filter of a traditional color camera, the visible light imaging lens is used for focusing the visible light reflected by an object on an imaging chip to enable the camera to output a color image, the infrared cut-off filter is used for cutting off the light outside the visible light wave band reflected by the object to enable the camera to output a clear color image without color cast, the phase distribution of the microstructure surface 321 of the visible light super-surface structure is designed according to f of an actual equivalent lens, and the formula is generally referred to:
is the phase value of any point on the super-surface structure, λ corresponds to the visible light wavelength, the substrate 322 of the visible light super-surface structure is usually made of quartz or schottky glass, and a special film layer is coated on the substrate (to cut off the light outside the visible light band). Of course, the super-surface structure material can also refer to the design in fig. 10, and the color camera has the focusing function by using the deformable material.
In another embodiment, an electronic device is provided, wherein the structured light module in the above embodiments is installed in the electronic device.
The above description is only exemplary of the preferred embodiments of the present invention, and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A structured light module comprises a structured light projector, an infrared receiving camera and a color camera, and is characterized in that the structured light projector, the infrared receiving camera and the color camera all at least comprise a light adjusting element, wherein at least one light adjusting element is of a super-surface structure.
2. The structured light module of claim 1 wherein the structured light projector comprises a laser light source and a light modulating element positioned to measure light from the laser light source, the light modulating element being a super-surface structure for beam collimation and replication of expanded beam.
3. The structured light module of claim 1, wherein the ir receiving camera comprises an ir imaging chip and a light modulating element on the light incident side of the ir imaging chip, wherein the light modulating element is an ir super-surface structure for converging and filtering light beams.
4. The structured light module of claim 1, wherein the color camera comprises a visible light imaging chip and a light modulating element on the light incident side of the visible light imaging chip, and the light modulating element is a visible light super-surface structure for converging and filtering light beams.
5. A structured light module according to any of claims 1 to 4, wherein a support is provided to fix the super-surface structure, the support being a bracket or a glue layer supporting the super-surface structure.
6. A structured light module according to any of claims 1 to 4, wherein the super-surface structure comprises at least one substrate of the super-surface structure and at least one microstructure surface of the super-surface structure, and the microstructure surface of the super-surface structure is provided with a plurality of sub-wavelength microstructure units arranged in a regular pattern.
7. The structured light module of claim 6 wherein the plurality of sub-wavelength microstructure units are of different sizes, and wherein the wavefront is modulated by changing the size or shape of the microstructure units;
or the sizes of the plurality of sub-wavelength microstructure units are the same, but the inclination angles are different, and the wavefront is regulated and controlled by changing the inclination angles.
8. The structured light module of claim 6 wherein the super-surface structures comprise a substrate of super-surface structures and a first and a second micro-structured side of super-surface structures distributed on opposite sides of the substrate of super-surface structures.
9. A structured light module according to claim 6, wherein the super-surface structures are a plurality of layers having different functions, each layer comprising a micro-structured surface of surface structures and a substrate of super-surface structures.
10. A structured light module according to claim 6, wherein the substrate of the super-surface structure and the micro-structured surface of the super-surface structure are made of deformable materials, and the focal length of the super-surface structure is adjusted according to the deformation.
11. An electronic device, characterized in that the electronic device is equipped with a structured light module according to any of claims 1-10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2021113051904 | 2021-11-05 | ||
| CN202111305190.4A CN113905222A (en) | 2021-11-05 | 2021-11-05 | Structured light module and electronic equipment |
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| CN114173107A true CN114173107A (en) | 2022-03-11 |
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| CN202111305190.4A Withdrawn CN113905222A (en) | 2021-11-05 | 2021-11-05 | Structured light module and electronic equipment |
| CN202210016035.9A Pending CN114173107A (en) | 2021-11-05 | 2022-01-07 | Structured light module and electronic equipment |
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| CN202111305190.4A Withdrawn CN113905222A (en) | 2021-11-05 | 2021-11-05 | Structured light module and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116500799A (en) * | 2023-06-29 | 2023-07-28 | 深圳市安思疆科技有限公司 | Structured light projector and structured light module |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116893513B (en) * | 2023-09-08 | 2023-12-12 | 深圳市安思疆科技有限公司 | Structured light generator and pattern coding projector |
-
2021
- 2021-11-05 CN CN202111305190.4A patent/CN113905222A/en not_active Withdrawn
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2022
- 2022-01-07 CN CN202210016035.9A patent/CN114173107A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116500799A (en) * | 2023-06-29 | 2023-07-28 | 深圳市安思疆科技有限公司 | Structured light projector and structured light module |
| CN116500799B (en) * | 2023-06-29 | 2023-08-22 | 深圳市安思疆科技有限公司 | Structured light projector and structured light module |
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| CN113905222A (en) | 2022-01-07 |
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