Design methods for 3D projectors and optical lenses

Abstract

This invention relates to the field of 3D vision technology, and more particularly to a design method for a 3D projector and an optical lens. The 3D projector includes: a circuit board, a first laser source, a second laser source, a collimating and illumination integrated mirror, and a diffractive optical element. The first and second laser sources are spaced apart and positioned on the same side of the circuit board, and the circuit board is electrically connected to the first and second laser sources. The collimating and illumination integrated mirror is positioned above the first and second laser sources, with its bottom tube fixedly connected to the circuit board and its top tube fixedly connected to the diffractive optical element. Compared to existing structured light projectors and floodlight illuminators which are separately configured, this invention expands the application scenarios of the 3D projector and reduces its size and production cost.

Description

Technical Field

[0001] This invention relates to the field of 3D vision technology, and in particular to a design method for a 3D projector and optical lens. Background Technology

[0002] Currently, 3D visual perception technology adds depth information of objects to the original 2D imaging, which only provides texture information of objects, for use in face recognition. The mainstream of 3D visual perception technology is structured light technology and time-of-flight technology, and the core component of structured light and time-of-flight technology systems is the projector.

[0003] Generally, commercially available 3D projectors include structured light projectors and floodlight illuminators. The structured light projector and floodlight illuminator work alternately at certain time intervals. The structured light projector projects a structured light pattern, while the floodlight illuminator projects a uniform infrared pattern. The infrared camera of the 3D projector receives the structured light pattern and the uniform infrared pattern for face recognition. However, since the existing structured light projector and floodlight illuminator are two different systems, they need to be set up separately, which results in a large size of the 3D projector and high production and assembly costs.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main objective of this invention is to provide a design method for a 3D projector and an optical lens, aiming to solve the technical problems of large size and high production and assembly costs of existing 3D projectors.

[0006] To achieve the above objectives, the present invention provides a 3D projector, which includes: a circuit board, a first laser source, a second laser source, a collimating and illumination integrated mirror, and diffractive optical elements;

[0007] The first laser source and the second laser source are spaced apart and disposed on the same side of the circuit board. The circuit board is electrically connected to the first laser source and the second laser source. The collimating and illumination integrated lens is disposed above the first laser source and the second laser source. The bottom of the lens barrel of the collimating and illumination integrated lens is fixedly connected to the circuit board, and the top of the lens barrel of the collimating and illumination integrated lens is fixedly connected to the diffractive optical element.

[0008] The circuit board is used to supply power to the first laser source and the second laser source at different time intervals;

[0009] The first laser source is used to emit structured light to the collimating illumination integrated mirror when powered on;

[0010] The collimating and illumination integrated lens is used to collimate and image the received structured light to obtain a clear light spot pattern;

[0011] The diffractive optical element is used to copy and diffuse the clear spot pattern to obtain a structured spot pattern with a larger field of view;

[0012] The second laser source is used to emit floodlight to the collimating illumination integrated mirror when powered on;

[0013] The collimating illumination integrated lens is also used to compress and image the divergence angle of the received floodlight to obtain a blurred spot image.

[0014] The diffractive optical element is also used to copy and diffuse the blurred spot pattern to obtain a uniform infrared spot pattern with a larger field of view.

[0015] Optionally, the collimating and illumination integrated mirror further includes: an optical lens, the optical lens including a collimating area, an illumination area and a splicing area;

[0016] The splicing area is connected to both the collimation area and the lighting area.

[0017] The collimation region is used to collimate and image the received structured light to obtain a clear light spot pattern;

[0018] The illumination area is used to compress and image the divergence angle of the received floodlight to obtain a blurred spot pattern.

[0019] The splicing area is used to prevent light beams projected onto the collimation area from entering the illumination area, and to prevent light beams projected onto the illumination area from entering the collimation area.

[0020] Optionally, the splicing area is sandblasted.

[0021] Furthermore, to achieve the above objectives, the present invention also proposes a design method for an optical lens, wherein the optical lens includes a collimation region, an illumination region, and a splicing region, and the design method includes:

[0022] Obtain the optical system parameters of the collimation region, determine the initial structure of the collimation region, and optimize the initial structure of the collimation region based on the optical system parameters of the collimation region to obtain the collimation region lens design;

[0023] Obtain the optical system parameters of the illumination region, determine the boundary conditions of the illumination region based on the boundary conditions of the collimation region lens design, determine the initial structure of the illumination region, and optimize the initial structure of the illumination region according to the optical system parameters and boundary conditions of the illumination region to obtain the lens design of the illumination region.

[0024] The collimation area splicing point is determined according to the collimation area lens design, and the illumination area splicing point is determined according to the illumination area lens design.

[0025] The collimation region lens design and the illumination region lens design are spliced ​​together according to the collimation region splicing point and the illumination region splicing point to obtain an optical lens that includes the collimation region, the illumination region and the splicing region.

[0026] Optionally, the steps of obtaining the optical system parameters of the collimation region, determining the initial structure of the collimation region, and optimizing the initial structure of the collimation region based on the optical system parameters of the collimation region to obtain the collimation region lens design include:

[0027] Obtain the optical system parameters of the collimation region, and determine the initial structure of the collimation region based on the historical collimation region lens design;

[0028] The collimation region lens design parameters are determined based on the optical system parameters of the collimation region and the initial structure of the collimation region.

[0029] By setting the variable parameters in the collimation zone lens design parameters as variables, the collimation zone variable parameters are obtained.

[0030] The initial structure of the collimation region is optimized according to the preset collimation region evaluation function to obtain the optimized collimation region lens structure;

[0031] The optimized collimation region lens structure is simulated, and it is determined whether the values ​​of the collimation region lens design image quality evaluation parameters obtained from the simulation meet the preset system design requirements.

[0032] If so, the optimized collimation region lens structure will be used as the collimation region lens design.

[0033] Optionally, the image quality evaluation parameters for the collimation zone lens design include at least one of: collimation, spot size at the optimal working distance, MTF, camera contrast, and distortion.

[0034] Optionally, the steps of obtaining the optical system parameters of the illumination region, determining the boundary conditions of the illumination region based on the boundary conditions of the collimating region lens design, determining the initial structure of the illumination region, and optimizing the initial structure of the illumination region according to the optical system parameters and boundary conditions of the illumination region to obtain the lens design of the illumination region include:

[0035] Obtain the optical system parameters of the illumination area, determine the boundary conditions of the illumination area based on the boundary conditions of the collimation area lens design, and determine the initial structure of the illumination area based on the historical illumination area lens design;

[0036] The lens design parameters of the illumination area are determined based on the optical system parameters of the illumination area, the boundary conditions of the illumination area, and the initial structure of the illumination area.

[0037] By setting the variable parameters in the lens design parameters of the lighting area as variables, the variable parameters of the lighting area are obtained.

[0038] The initial structure of the lighting area is optimized according to the first preset lighting area evaluation function to obtain the optimized lighting area lens structure;

[0039] The optimized illumination area lens structure is simulated, and it is determined whether the simulated values ​​of the illumination area lens design image quality evaluation parameters meet the preset system design requirements.

[0040] If so, the optimized illumination area lens structure will be used as the illumination area lens design.

[0041] Optionally, the image quality evaluation parameters for the lens design in the illumination area include at least one of the following: spot size at the optimal working distance, spot overlap, and light energy utilization.

[0042] Optionally, after the steps of obtaining the optical system parameters of the collimation region, determining the initial structure of the collimation region, and optimizing the initial structure of the collimation region based on the optical system parameters of the collimation region to obtain the collimation region lens design, the method further includes:

[0043] Determine the light source distribution field of the second laser source;

[0044] The distance range between the lens in the illumination area and the second laser source is determined based on the lens boundary position in the collimation area lens design.

[0045] Determine the target light field distribution of the collimation region lens design at the optimal working distance;

[0046] Based on the light source distribution field and the target light source distribution field, obtain discrete coordinate information that meets the preset requirements;

[0047] The discrete coordinate information is fitted using a preset algorithm, and the initial structure of the lighting area is obtained based on the fitting result and the distance range.

[0048] A second preset lighting area evaluation function is constructed based on the average standard deviation of the target surface illuminance and the light energy utilization rate.

[0049] The initial structure of the lighting area is optimized according to the second preset lighting area evaluation function to obtain the optimized lighting area lens structure;

[0050] The optimized illumination area lens structure is simulated to determine whether the illuminance and light energy utilization obtained from the simulation meet the preset system design requirements.

[0051] If so, the optimized illumination area lens structure will be used as the illumination area lens design.

[0052] Optionally, the steps of determining the collimation region splicing point based on the collimation region lens design and determining the illumination region splicing point based on the illumination region lens design include:

[0053] The position information of the light spot at the edge of the collimation region and the position information of the point on the edge of the collimation region mirror are determined based on the collimation region lens design.

[0054] The collimation region splicing point is determined based on the position information of the light spot at the edge of the collimation region and the position information of the mirror edge point in the collimation region.

[0055] Based on the lens design of the illumination area, determine the position information of the light spot at the edge of the illumination area and the position information of the mirror edge point in the illumination area;

[0056] The splicing point of the lighting area is determined based on the position information of the light spot at the edge of the lighting area and the position information of the mirror edge point of the lighting area.

[0057] This invention provides a 3D projector, comprising: a circuit board, a first laser source, a second laser source, a collimating and illumination integrated mirror, and a diffractive optical element; wherein the first laser source and the second laser source are spaced apart and disposed on the same side of the circuit board, the circuit board being electrically connected to the first laser source and the second laser source, the collimating and illumination integrated mirror being disposed above the first laser source and the second laser source, and the bottom of the lens barrel of the collimating and illumination integrated mirror being fixedly connected to the circuit board, and the top of the lens barrel of the collimating and illumination integrated mirror being fixedly connected to the diffractive optical element; the circuit board is used to project the first laser light at different time intervals. The system is powered by a first laser source and a second laser source. The first laser source emits structured light to the collimating and illuminating integrated mirror upon power-up. The collimating and illuminating integrated mirror collimates and images the received structured light to obtain a clear light spot pattern. The diffractive optical element replicates and diffuses the clear light spot pattern to obtain a structured light spot pattern with a larger field of view. The second laser source emits floodlight to the collimating and illuminating integrated mirror upon power-up. The collimating and illuminating integrated mirror also compresses and images the divergence angle of the received floodlight to obtain a blurred light spot pattern. The diffractive optical element also replicates and diffuses the blurred light spot pattern to obtain a uniform infrared light spot pattern with a larger field of view. Because this invention places the first and second laser sources within the same mirror tube and uses the collimating and illuminating integrated mirror for imaging to obtain a structured light spot pattern with a larger field of view and a uniform infrared light spot pattern, compared to existing systems where the structured light projector and floodlight illuminator are separate, this invention reduces the size of the 3D projector and saves production and assembly costs. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of the structure of a first embodiment of the 3D projector provided in this invention.

[0059] Figure 2 This is a flowchart illustrating the first embodiment of the optical lens design method of the present invention;

[0060] Figure 3 This is a simulated optical path diagram showing the optimal working distance of the collimation region in the optical lens design method of this invention.

[0061] Figure 4 This is a structural light spot diagram of adjacent points under the optimal working distance of the collimation region in the optical lens design method of the present invention;

[0062] Figure 5 This is a schematic diagram of the imaging effect in the collimation region of the optical lens design method of the present invention;

[0063] Figure 6This is a simulated optical path diagram showing the optimal working distance of the illumination area in the optical lens design method of the present invention.

[0064] Figure 7 This is an infrared spot diagram of adjacent points under the optimal working distance of the illumination area in the optical lens design method of the present invention;

[0065] Figure 8 This is a schematic diagram of the imaging effect of the illumination area in the optical lens design method of the present invention;

[0066] Figure 9 This is a structural diagram of the assembled optical lens in the optical lens design method of the present invention;

[0067] Figure 10 This is a structural diagram of the constrained optical lens in the optical lens design method of the present invention.

[0068] Explanation of icon numbers:

[0069]

[0070] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0071] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0072] It should be noted that if the embodiments of the present invention involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0073] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0074] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0075] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of a first embodiment of the 3D projector provided in this invention.

[0076] like Figure 1 As shown, the 3D projector includes: a circuit board 101, a first laser source 102, a second laser source 103, a collimating and illumination integrated mirror 104, and a diffractive optical element 105;

[0077] The first laser source 102 and the second laser source 103 are spaced apart and disposed on the same side of the circuit board 101. The circuit board 101 is electrically connected to the first laser source 102 and the second laser source 103. The collimating and illumination integrated lens 104 is disposed above the first laser source 102 and the second laser source 103. The bottom of the lens barrel of the collimating and illumination integrated lens 104 is fixedly connected to the circuit board 101, and the top of the lens barrel of the collimating and illumination integrated lens 104 is fixedly connected to the diffractive optical element 105.

[0078] The circuit board 101 is used to supply power to the first laser source 102 and the second laser source 103 at different time intervals.

[0079] The first laser source 102 is used to emit structured light to the collimating illumination integrated mirror 104 when powered on;

[0080] The collimating and illumination integrated mirror 104 is used to collimate and image the received structured light to obtain a clear light spot pattern;

[0081] The diffractive optical element 105 is used to copy and diffuse the clear spot pattern to obtain a structured spot pattern with a larger field of view.

[0082] The second laser source 103 is used to emit floodlight to the collimating illumination integrated mirror 104 when powered on;

[0083] The collimating illumination integrated lens 104 is also used to compress and image the divergence angle of the received floodlight to obtain a blurred spot image.

[0084] The diffractive optical element 105 is also used to copy and diffuse the blurred spot pattern to obtain a uniform infrared spot pattern with a larger field of view.

[0085] It should be noted that the 3D projector provided in this embodiment can be applied in scenarios that require 3D visual perception, such as face recognition, human body scanning, and motion-sensing fitness. This embodiment does not limit this application.

[0086] It is understood that the circuit board 101 can be a rigid-flex board or a ceramic substrate. The circuit board 101 is used to supply power to the first laser source 102 and the second laser source 103 at different time intervals. The time intervals can be set according to the actual usage.

[0087] The first laser source 102 mentioned above can be an LED source, a vertical cavity surface-emitting laser, or a horizontal cavity surface-emitting laser. This embodiment does not limit this. The surface of the first laser source 102 can be distributed with multiple pseudo-randomly arranged dots. The dots can be used to make the first laser source 102 emit structured light. The wavelength of the structured light emitted by the first laser source 102 is in the infrared band. Different emission wavelengths can be selected according to system requirements. Generally, wavelengths such as 850nm and 940nm in the infrared band can be selected.

[0088] The second laser source 103 can also be an LED source, a vertical cavity surface-emitting laser, or a horizontal cavity surface-emitting laser. This embodiment does not limit this. The surface of the second laser source 103 can be distributed with one or more light-emitting points, which can be set according to the actual use. When there are multiple light-emitting points, the arrangement between the light-emitting points can be arranged according to a certain rule, such as arranging adjacent light-emitting points at equal intervals, or arranging them according to a certain division of areas, or they can be arranged randomly. The light-emitting points can make the second laser source 103 emit floodlight. The wavelength of the floodlight emitted by the second laser source 103 can be the same as the wavelength of the structured light emitted by the first laser source 102.

[0089] It should be understood that, for ease of production, the circuit board 101 can be electrically connected to the first laser source 102 and the second laser source 103 by means of conductive adhesive and gold wire, or by means of soldering with solder paste.

[0090] Furthermore, the aforementioned collimating and illumination integrated mirror 104 may include a mirror barrel and an optical lens. The optical lens is disposed inside the mirror barrel, which is used to fix the optical lens. The number of lenses in the optical lens may be one or multiple, and can be set according to the actual situation.

[0091] Since the optical imaging quality evaluation indicators for the first laser source 102 and the second laser source 103 after passing through the optical lens are different, the optical lens can be divided into three regions, including a collimation region 1, an illumination region 2, and a stitching region 3. For example... Figure 1 As shown, the splicing area 3 is connected to the collimation area 1 and the lighting area 2, respectively.

[0092] The collimation region 1 is used to collimate and image the received structured light to obtain a clear light spot image; the illumination region 2 is used to compress and image the divergence angle of the received floodlight to obtain a blurred light spot image; the splicing region 3 is used to prevent the light beam projected onto the collimation region 1 from entering the illumination region 2, and to prevent the light beam projected onto the illumination region 2 from entering the collimation region 1.

[0093] It should be noted that the collimation region 1 can be used to collimate the structured light emitted by the first laser source 102 into a parallel beam. When the structured light passes through the collimation region 1, a clear light spot pattern with the same light emission aperture distribution as the collimation region 1 can be obtained within the working distance range.

[0094] Understandably, the aforementioned illumination area 2 can be used to compress the divergence angle of the floodlight emitted by the second laser source 103 to obtain a divergent beam at a certain angle. After passing through the illumination area 2, the aforementioned floodlight can become multiple blurred and diffused light spots, and adjacent light spots overlap each other to form a uniformly distributed infrared image.

[0095] To prevent the light beam projected onto the collimation region 1 from entering the illumination region 2, and to prevent the light beam projected onto the illumination region 2 from entering the collimation region 1, thereby affecting the imaging quality, a splicing region 3 is divided between the collimation region 1 and the illumination region 2. At the same time, to prevent the splicing region 3 from imaging stray light in the structured light and floodlight during actual operation, thus affecting the performance, in this embodiment, the optical lens part corresponding to the splicing region 3 can be sandblasted.

[0096] Meanwhile, in order to further ensure that the light beam projected onto the collimation region 1 does not enter the illumination region 2, and to ensure that the light beam projected onto the illumination region 2 does not enter the collimation region 1, the first laser source 102 and the second laser source 103 are arranged at intervals on the circuit board 101, with a certain distance reserved between the first laser source 102 and the second laser source 103.

[0097] It should be noted that the diffractive optical element 105 can be used to diffract and replicate the incident light beam into a light beam with a larger field of view. Correspondingly, the clear light spot pattern is replicated and diffused by the diffractive optical element 105 into a structured light spot pattern with a larger viewing angle and certain structural features, and the uniformly distributed infrared pattern is replicated and diffused by the diffractive optical element 105 into a uniform infrared light spot pattern with a larger viewing angle.

[0098] This embodiment provides a 3D projector, which includes: a circuit board 101, a first laser source 102, a second laser source 103, a collimating and illumination integrated lens 104, and a diffractive optical element 105. The structured light emitted from the first laser source 102 is collimated and imaged through the collimation region 1 of the optical lens, and then replicated and diffused through the diffractive optical element 105 to obtain a structured light spot pattern with a larger field of view. The second laser source 103 emits floodlight, and the divergence angle of the floodlight is compressed and imaged through the illumination region 2 of the optical lens, and then replicated and diffused through the diffractive optical element 105 to obtain a uniform infrared light spot pattern with a larger field of view. The splicing region 3 of the optical lens splices the collimation region 1 and the illumination region 2 together, preventing stray light imaging from affecting the performance. In other words, the functions of the structured light projector and the floodlight projector are integrated into one projector, reducing the cost and size of the 3D projector. The structured light projector is designed to be suitable for applications where size is a constraint, such as mobile terminals and AR / VR scenarios. In the field of facial payment, the structured light projector includes a floodlight illuminator that emits uniform infrared light, forming a uniform infrared image on an infrared camera for facial recognition and detection. The 3D projector provided in this embodiment can also be used in this scenario. Because this embodiment saves on a floodlight illuminator component, it reduces the overall material and assembly costs of the 3D projector. Furthermore, by combining the functions of a structured light projector and a floodlight projector into a single projector, the 3D projector can simultaneously support both functions. The structured light projector enables high-precision short-range distance measurement, while the ToF projector enables long-range measurement, meeting the ranging requirements for different distances and expanding the projector's application scenarios.

[0099] In addition, refer to Figure 2 , Figure 2 This is a flowchart illustrating the first embodiment of the optical lens design method of the present invention.

[0100] like Figure 2 As shown, the optical lens includes a collimation region, an illumination region, and a splicing region, and the design method includes:

[0101] Step S10: Obtain the optical system parameters of the collimation region, determine the initial structure of the collimation region, and optimize the initial structure of the collimation region according to the optical system parameters of the collimation region to obtain the collimation region lens design;

[0102] It should be noted that the method in this embodiment can be applied to the design of optical lenses in the aforementioned 3D projector, or to other scenarios requiring the design of optical lenses. The executing entity in this embodiment can be a device capable of designing optical lenses, such as a computer, or other devices capable of performing the same or similar functions. Here, we will use the aforementioned device capable of designing optical lenses (hereinafter referred to as the device) for explanation.

[0103] It is understood that the optical system parameters of the collimation region mentioned above may include: focal length, numerical aperture, aperture, object height, working wavelength, optimal working distance, and exit pupil position. These optical system parameters can be determined by the user according to the actual usage scenario, or the user can set the usage scenario and the device can calculate and determine them automatically. In this embodiment, the object height should theoretically be set to the diagonal length of the effective luminous area of ​​the first laser source. However, in actual applications, factors such as the assembly error of the collimation and illumination integrated mirror and the reserved space when splicing optical lenses need to be considered. The object height set during the design will be increased by a reserved amount on the diagonal length of the effective luminous area of ​​the first laser source. For example, the object height is set to be increased by 0.1mm on the diagonal length of the effective luminous area of ​​the first laser source. The working wavelength can be set to be consistent with the wavelength of the beam emitted by the first laser source, or multiple wavelength values ​​including the wavelength of the beam emitted by the first laser source can be set. The confirmation of the exit pupil position is related to the interval between the microstructure surface of the diffractive optical element and the collimation and illumination integrated mirror. The optimal working distance is the position of the object when the structured light images the object most clearly, for example, 400mm.

[0104] Furthermore, in order to obtain a more accurate collimation zone lens design, step S10 above includes:

[0105] Step S11: Obtain the optical system parameters of the collimation region, and determine the initial structure of the collimation region based on the historical collimation region lens design;

[0106] Understandably, the aforementioned historical collimation zone lens design can be a previously used collimation zone lens design, which can be stored in a lens database. The aforementioned device can query the lens database for a collimation zone lens design that meets the user's needs as the initial structure of the collimation zone. In addition, the aforementioned device can also obtain an initial structure that meets the user's needs based on primary aberration theory.

[0107] It should be noted that user requirements may also include information such as the number of lenses used, focal length, and aperture number. It should be noted that although the more lenses used, the higher the image quality, the higher the cost. In this embodiment, the number of lenses used can be set by the user according to the actual situation.

[0108] Step S12: Determine the lens design parameters of the collimation region based on the optical system parameters of the collimation region and the initial structure of the collimation region;

[0109] It should be understood that the above-mentioned collimation zone lens design parameters may include lens surface parameters, lens material, lens thickness, and spacing between lenses.

[0110] In practice, the device acquires the optical system parameters of the collimation region, obtains the initial structure of the collimation region based on primary aberration theory or lens database, and then determines the lens design parameters of the collimation region based on the optical system parameters and the initial structure of the collimation region.

[0111] Step S13: Set the variable parameters in the collimation region lens design parameters as variables to obtain the collimation region variable parameters;

[0112] It should be noted that in order to optimize the initial structure of the collimation region to meet the user's requirements, the parameters that need to be adjusted in the collimation region lens design parameters need to be set as variables.

[0113] Step S14: Optimize the initial structure of the collimation region according to the preset collimation region evaluation function to obtain the optimized collimation region lens structure;

[0114] It is understandable that the aforementioned preset collimation region evaluation function can be an image quality evaluation function set according to the image quality and structural requirements of the collimation region, such as spot size, distortion, collimation, total optical length, focal length, lens diameter, etc. The structural requirements may also include relevant requirements for subsequent structural parameters. The aforementioned device can optimize the initial structure of the collimation region through the preset collimation region evaluation function.

[0115] It should be emphasized that the above optimization can be an adjustment to the initial structure of the collimation region, such as adjusting the lens shape, lens thickness, lens material or lens spacing, or it can be an adjustment to the preset collimation region evaluation function. This embodiment does not limit this.

[0116] Step S15: Simulate the optimized collimation region lens structure and determine whether the values ​​of the collimation region lens design image quality evaluation parameters obtained from the simulation meet the preset system design requirements.

[0117] It should be understood that the above-mentioned collimation region lens design image quality evaluation parameters can be parameters used to determine whether the optimized collimation region lens structure meets the requirements. Specifically, they may include parameters such as collimation, initial structure spot size at the optimal working distance, modulation transfer function (MTF), relative illumination, and distortion. They may also be other parameters used to determine the simulation results of the collimation region. This embodiment does not limit these parameters.

[0118] It should be emphasized that the device can also determine whether the values ​​of the collimation region lens structure parameters obtained from the simulation meet the preset system design requirements. The collimation region lens structure parameters may include parameters such as total optical length, focal length, and lens diameter, or other parameters used to determine the simulation results of the collimation region. This embodiment does not limit these parameters.

[0119] It should be noted that the above-mentioned preset system design requirements can be preset ranges for the image quality evaluation parameters and structural parameters of the collimation area lens. When the image quality evaluation parameters and structural parameters of the collimation area lens are within the preset range, it indicates that the optimized collimation area lens structure meets the user's needs.

[0120] Step S16: If so, the optimized collimation region lens structure shall be used as the collimation region lens design.

[0121] In specific implementation, the above-mentioned device sets the variable parameters in the collimation region lens design parameters as variables to obtain the collimation region variable parameters. Then, it optimizes the initial structure of the collimation region according to the preset collimation region evaluation function to obtain the optimized collimation region lens structure. The optimized collimation region lens structure is then simulated to determine whether the simulation results meet the preset system design requirements. If so, the optimized collimation region lens structure is used as the collimation region lens design.

[0122] Furthermore, it should be noted that if the simulated values ​​of the collimation region lens design image quality evaluation parameters do not meet the preset system design requirements, the above-mentioned equipment can readjust the preset collimation region evaluation function or change the collimation region lens structure based on the image quality evaluation parameters that do not meet the design requirements, and continue to optimize until the above-mentioned image quality evaluation parameters meet the preset system design requirements, and the collimation region lens structure that meets the requirements is taken as the collimation region lens design.

[0123] For ease of understanding, please refer to Figure 3 , Figure 4 and Figure 5 For example, Figure 3As shown, to balance the overall cost of the 3D projector and the imaging quality requirements, in this embodiment, the collimation region has three lenses: a first collimating lens 302, a second collimating lens 303, and a third collimating lens 304. The first collimating lens 302 is composed of a first collimating surface s1 and a second collimating surface s2, both with even-order aspherical surfaces. The second collimating lens 303 is composed of a third collimating surface s3 and a fourth collimating surface s4, both with even-order aspherical surfaces. The third collimating lens 304 is composed of a fifth collimating surface s5 and a sixth collimating surface s6, both with even-order aspherical surfaces. The first collimating surface s1 is convex, used to compress the beam aperture of the first laser source 102 and reduce the size of the optical lens aperture in the collimation region 1. The second collimating surface s2 is a convex surface with a smaller curvature than the first collimating surface s1. The third collimating surface s3 is concave. The fourth collimating surface s4 is convex, composed of a third collimating surface s3 and a fourth collimating surface s4. Surface s4 is convex, the fifth collimated surface s5 is concave, and the sixth collimated surface s6 is concave. Based on the actual diagonal dimensions of the first laser source 102, the center emitting point A of the first laser source 102 is superimposed with the collimating lens assembly error offset and the reserved distance during lens splicing, thus obtaining the edge emitting points B and C of the first laser source 102. The edge rays emitted by the edge emitting point B of the first laser source 102 intersect with the first collimated surface s1, the second collimated surface s2, the third collimated surface s3, the fourth collimated surface s4, the fifth collimated surface s5, and the sixth collimated surface s6 at points D, E, F, G, H, and I, respectively. The edge points of the first collimated surface s1, the second collimated surface s2, the third collimated surface s3, the fourth collimated surface s4, the fifth collimated surface s5, and the sixth collimated surface s6 are points J, K, L, M, N, and O, respectively. Figure 3 As shown, according to the specified coordinate direction, it can be seen that the light emitted by the first laser source 102 is collimated into parallel light with good parallelism after passing through 3 collimating lenses.

[0124] like Figure 4 As shown, it should be noted that Figure 4 Only the spot diagram of three adjacent emitting points in the first laser source at the optimal working distance is shown. The distance between the emitting points of the first laser source corresponding to the first structured light spot 401, the second structured light spot 402, and the third structured light spot 403 can be the nearest distance value between adjacent emitting points of the first laser source. In this embodiment, the aforementioned nearest distance value can be set to 23 μm, that is, the distance between the emitting point of the first laser source corresponding to the first structured light spot 401 and the emitting point of the first laser source corresponding to the second structured light spot 402 is 23 μm, the distance between the emitting point of the first laser source corresponding to the second structured light spot 402 and the emitting point of the first laser source corresponding to the third structured light spot 403 is 23 μm. Figure 4As can be seen, the three structured light spots are separated at the optimal working distance. At the optimal working distance, the spot size is very small. That is, after imaging by the collimating region lens, the distribution of the light spot of the first laser source at the optimal working distance is the same as the distribution of the first laser source, and the light spot is clear. This indicates that the collimating region lens design meets the design requirements.

[0125] like Figure 5 As shown, the schematic diagram 501 of the light emission point distribution of the first laser source obtains the collimated imaging result 503 at the optimal working distance through the lens schematic diagram 502 of the collimation region. The light spot distribution of the schematic diagram 501 of the light emission point distribution of the first laser source is the same as that of the collimated imaging result 503, and the light spot is clear. If the collimated imaging result 503 is then passed through the diffraction optical element 105, it can be replicated and diffused into a structured light spot diagram 505 with a larger field of view and certain characteristics. The above-mentioned preset system design requirements of the collimation region lens design can also be that, within a certain distance range, the light spots of the first laser source light emission point are separated from each other after passing through the collimation region imaging, and the imaging light spot is clear, and the smaller the light spot size, the better.

[0126] Continue as Figure 2 As shown, step S20: Obtain the optical system parameters of the illumination area, determine the boundary conditions of the illumination area based on the boundary conditions of the collimation area lens design, determine the initial structure of the illumination area, and optimize the initial structure of the illumination area according to the optical system parameters of the illumination area and the boundary conditions of the illumination area to obtain the lens design of the illumination area;

[0127] It should be noted that the optical system parameters of the aforementioned illumination area may include: focal length, aperture, object height, working wavelength, and exit pupil position. These optical system parameters can be determined by the user based on the actual usage scenario, or the user can set the usage scenario and the device can calculate and determine them automatically. In this embodiment, the object height should theoretically be set to the diagonal length of the effective luminous area of ​​the second laser source. However, in actual applications, factors such as the assembly error of the collimating illumination integrated mirror and the reserved space during the splicing of optical lenses need to be considered. The object height set during the design will have an additional reserved amount added to the diagonal length of the effective luminous area of ​​the second laser source. For example, the object height is set to be 0.1 mm longer than the diagonal length of the effective luminous area of ​​the second laser source. The working wavelength can be set to be consistent with the wavelength of the beam emitted by the second laser source. The confirmation of the exit pupil position is related to the spacing between the microstructure surface of the diffractive optical element and the collimating illumination integrated mirror.

[0128] Furthermore, in order to obtain a more accurate lens design for the illumination area, step S20 above includes:

[0129] Step S21: Obtain the optical system parameters of the illumination area, determine the boundary conditions of the illumination area based on the boundary conditions of the collimation area lens design, and determine the initial structure of the illumination area according to the historical illumination area lens design;

[0130] Understandably, the aforementioned historical illumination area lens design can be a used illumination area lens design, which can be stored in a lens database. The aforementioned device can query the lens database to find an illumination area lens design that meets the user's needs as the initial structure of the illumination area. In addition, the aforementioned device can also obtain an initial structure that meets the user's needs based on the primary aberration theory.

[0131] It should be noted that the boundary condition of the collimation area lens design can be the distance between the reference point on the collimation area lens and the first laser source, and the boundary condition of the illumination area can be the distance between the reference point on the illumination area lens and the second laser source. The reference point on the collimation area lens can be any point between the edge light point of the subsequent collimation area and the edge point of the collimation area mirror. The reference point on the illumination area lens can be any point between the edge light point of the subsequent illumination area and the edge point of the illumination area mirror. The distance between the reference point on the collimation area lens and the first laser source and the distance between the reference point on the illumination area lens and the second laser source can be within a preset range, and the size of the preset range can be determined according to the actual processing capability.

[0132] Step S22: Determine the lens design parameters of the illumination area based on the optical system parameters of the illumination area, the boundary conditions of the illumination area, and the initial structure of the illumination area;

[0133] It should be understood that the above-mentioned lens design parameters for the lighting area may include parameters such as lens surface shape parameters, lens material, lens thickness, and spacing between lenses.

[0134] In its specific implementation, the device acquires the optical system parameters of the illumination area, determines the boundary conditions of the illumination area based on the boundary conditions of the collimation area lens design, obtains the initial structure of the illumination area by querying the primary aberration theory or lens database, and then determines the lens design parameters of the illumination area based on the optical system parameters of the illumination area, the boundary conditions of the illumination area, and the initial structure of the illumination area.

[0135] Step S23: Set the variable parameters in the lens design parameters of the lighting area as variables to obtain the variable parameters of the lighting area;

[0136] It should be noted that in order to optimize the initial structure of the lighting area to meet the user's requirements, the parameters that need to be adjusted in the lens design parameters of the lighting area need to be set as variables.

[0137] Step S24: Optimize the initial structure of the lighting area according to the first preset lighting area evaluation function to obtain the optimized lighting area lens structure;

[0138] It is understood that the aforementioned first preset lighting area evaluation function can be an image quality evaluation function set according to the imaging quality and structural requirements of the lighting area, such as spot size, spot overlap, total optical length, focal length, lens aperture, etc. The structural requirements may also include relevant requirements for subsequent structural parameters. The aforementioned device can optimize the initial structure of the lighting area through the first preset lighting area evaluation function.

[0139] It should be emphasized that the above optimization can be an adjustment to the initial structure of the above lighting area, such as adjusting the lens shape, lens thickness, lens material or lens spacing, or it can be an adjustment to the evaluation function of the above first preset lighting area. This embodiment does not limit this.

[0140] Step S25: Simulate the optimized illumination area lens structure and determine whether the simulated values ​​of the illumination area lens design image quality evaluation parameters meet the preset system design requirements.

[0141] It should be understood that the image quality evaluation parameters of the above-mentioned lens design in the lighting area can be parameters used to determine whether the optimized collimation area lens structure meets the requirements. Specifically, these parameters may include: spot size at the optimal working distance, spot overlap, and light energy utilization rate, etc. They may also be other parameters used to optimize the simulation results of the lighting area. This embodiment does not limit these parameters.

[0142] It should be emphasized that the device can also determine whether the values ​​of the simulated lens structure parameters of the lighting area meet the preset system design requirements. The aforementioned lens structure parameters of the lighting area may include parameters such as total optical length, focal length, and lens diameter, or other parameters used to determine the simulation results of the lighting area. This embodiment does not limit these parameters.

[0143] It is understandable that the aforementioned preset system design requirements may also include preset ranges for the image quality evaluation parameters of the lens design in the aforementioned illumination area. When the image quality evaluation parameters of the lens design in the illumination area are within the preset range, it indicates that the currently optimized lens structure in the illumination area meets the user's needs. For example, the aforementioned preset system design requirements may require that the beam emitted by the closest light-emitting point of the second laser source has a spot overlap area greater than 50% within the working distance range; in order to prevent light energy waste, it may be required that within the working distance range, the spot size formed on the object by the beam emitted by a single light-emitting point of the second laser source cannot exceed the preset range, and the preset range can be set by the user according to the actual usage; in order to improve light energy utilization, it may be required that more of the beam from the second laser source is incident on the effective area of ​​the diffractive optical element.

[0144] Step S26: If so, the optimized illumination area lens structure is used as the illumination area lens design.

[0145] In a specific implementation, the aforementioned device sets the variable parameters in the lens design parameters of the lighting area as variables to obtain the variable parameters of the lighting area. Then, it optimizes the initial structure of the lighting area according to the preset lighting area evaluation function to obtain the optimized lighting area lens structure. The optimized lighting area lens structure is then simulated to determine whether the simulation results meet the preset system design requirements. If so, the optimized lighting area lens structure is used as the lighting area lens design.

[0146] Furthermore, it should be noted that if the simulated image quality evaluation parameters of the illumination area lens design do not meet the preset system design requirements, the above-mentioned equipment can readjust the preset illumination area evaluation function or change the illumination area lens structure based on the image quality evaluation parameters that do not meet the design requirements, and continue to optimize until the above-mentioned image quality evaluation parameters meet the preset system design requirements, and the illumination area lens structure that meets the requirements is taken as the illumination area lens design.

[0147] For ease of understanding, please refer to Figure 6 , Figure 7 and Figure 8 For example, Figure 6 As shown, since the imaging quality requirements for the beam emitted by the second laser source 103 from the mirror in the illumination area are not high, it is only necessary to compress the divergence angle of the second laser source 103 and make more of the beam emitted by the second laser source 103 incident on the effective aperture of the diffractive optical element. The above function can be accomplished by an aspherical surface. Generally, the aspherical surface is placed on the first surface, which can effectively compress the aperture value of the lens design. In this embodiment, the number of lenses in the illumination area is 3, namely the first illumination lens 602, the second illumination lens 603 and the third illumination lens 604. The first illumination lens 602 is composed of the first illumination surface s1' and the second illumination surface s2. The first illumination surface s1' is an even-order aspherical surface, the second illumination surface s2' is a plane, the second illumination lens 603 is composed of the third illumination surface s3' and the fourth illumination surface s4', both of which are planes, and the third illumination lens 604 is composed of the fifth illumination surface s5' and the sixth illumination surface s6', both of which are planes. The above examples are only for illustrative purposes. The first illumination surface s1', the second illumination surface s2', the third illumination surface s3', the fourth illumination surface s4', the fifth illumination surface s5', and the sixth illumination surface s6' can also be spherical, aspherical, or other surface structures. This embodiment does not limit this.

[0148] The first illumination surface s1' is a convex surface, used to compress the aperture of the second laser source 103 and reduce the size of the optical lens aperture in the illumination area. Based on the central emitting point A' of the second laser source 103, and considering the assembly error offset of the collimating and illumination integrated lens and the reserved distance during lens splicing, the edge emitting points B' and C' of the second laser source 103 can be obtained. The edge rays emitted by the edge emitting point B' of the first laser source 102 interact with the first illumination surface s1' and the second illumination surface s1'. The intersection points of the illuminated surfaces s2', s3', s4', s5', and s6' are D', E', F', G', H', and I', respectively. The edge points of the illuminated surfaces s1', s2', s3', s4', s5', and s6' are J', K', L', M', N', and O', respectively. Figure 6 As shown, based on the coordinate direction, it can be seen that the light emitted by the second laser source 103 is still a divergent beam after passing through the three illumination lenses, and the divergence angle of the beam is smaller than that of the second laser source 103 itself.

[0149] Meanwhile, to facilitate subsequent splicing work, the distance between point E' and the emitting surface of the second laser source 103 in the z-axis direction is... Figure 3 The distance from point K to the emitting surface of the first laser source 102 along the z-axis is equal to the distance from point F' to the emitting surface of the second laser source 103 along the z-axis. Figure 3 The distance from point L to the emitting surface of the first laser source 102 along the z-axis is equal to the distance from point G' to the emitting surface of the second laser source 103 along the z-axis. Figure 3 The distance from point M to the emitting surface of the first laser source 102 along the z-axis is equal to the distance from point H' to the emitting surface of the second laser source 103 along the z-axis. Figure 3 The distance from point N to the emitting surface of the first laser source 102 along the z-axis is equal to the distance from point I' to the emitting surface of the second laser source 103 along the z-axis. Figure 3 The distance between point O and the light-emitting surface of the first laser source 102 in the z-axis direction is equal.

[0150] The light spot pattern of the second laser source across the illuminated area is shown below. Figure 7 As shown, it should be noted that Figure 7Only the spot diagram of three adjacent emitting points in the second laser source at the optimal working distance is shown. The distance between the emitting points of the second laser source corresponding to the first infrared spot 701, the second infrared spot 702, and the third infrared spot 703 can be the closest distance value between adjacent emitting points of the second laser source. In this embodiment, the aforementioned closest distance value can be set to 23 μm, that is, the distance between the emitting point of the second laser source corresponding to the first infrared spot 701 and the emitting point of the second laser source corresponding to the second infrared spot 702 is 23 μm, and the distance between the emitting point of the second laser source corresponding to the second infrared spot 702 and the emitting point of the second laser source corresponding to the third infrared spot 703 is 23 μm. Figure 7 It can be seen that the overlap area of ​​the light spots formed on the object by the two adjacent initial infrared light spots after passing through the lens of the illumination area is more than 95%. That is, after passing through the lens of the illumination area, the initial infrared light spots of the second laser source at the optimal working distance overlap with each other to form uniform infrared light, which meets the preset system design requirements.

[0151] like Figure 8 As shown, the schematic diagram 801 of the distribution of the light-emitting points of the second laser source obtains the illumination imaging result 803 at the optimal working distance through the lens schematic diagram 802 of the illumination area. The light spots of the schematic diagram 801 of the distribution of the light-emitting points of the second laser source and the illumination imaging result 803 overlap with each other to form a uniform infrared light spot. If the illumination imaging result 803 passes through the diffraction optical element 105, it can be replicated and diffused into a uniform infrared light spot diagram 805 with a larger field of view. The mirror design requirement of the illumination area is that the overlap area of ​​the light spots of adjacent light-emitting points of the second laser source within the working distance is at least 50%, and that the size of the light spot after imaging a single light-emitting point of the second laser source through the illumination area is within a certain preset range within the working distance.

[0152] To ensure a more uniform light spot after the second laser source passes through the lens in the illumination area, based on the above embodiment, to obtain the lens design for the illumination area, step S10 may further include:

[0153] Step a: Determine the light source distribution field of the second laser source.

[0154] It should be noted that, as Figure 8 As shown, the second laser source is a regularly arranged array of point light sources. The light source distribution field of the second laser source can be determined by obtaining the size of the emitting area of ​​the second laser source, the divergence angle of the point light sources, and the distribution function of the point light sources.

[0155] Step b: Determine the distance range between the lens in the illumination area and the second laser source based on the lens boundary position in the collimation area lens design.

[0156] Understandably, the above-mentioned device can first determine the boundary position of the illumination area based on the boundary position of the collimating area lens, and then determine the distance range between the illumination area lens and the second laser source based on the boundary position of the illumination area.

[0157] Step c: Determine the target light field distribution of the collimation region lens design at the optimal working distance.

[0158] It should be understood that the target light field distribution can be the light field after the beam emitted by the first laser source passes through the collimation zone lens. In this embodiment, the target light field distribution can be set to a uniform rectangular light spot with a size that matches the replication period of the diffraction optical element.

[0159] Step d: Obtain discrete coordinate information that meets preset requirements based on the light source distribution field and the target light source distribution field.

[0160] It should be noted that the above preset requirements can be set by the user according to their usage requirements for the lighting area.

[0161] Step e: Fit the discrete coordinate information using a preset algorithm, and obtain the initial structure of the illumination area based on the fitting result and the distance range.

[0162] It should be understood that the above-mentioned preset algorithm can be the least squares method, singular value decomposition method or optimization solution method, and the above-mentioned preset algorithm can be selected according to the discrete coordinate information.

[0163] Step f: Construct a second preset lighting area evaluation function based on the average standard deviation of the target surface illuminance and the light energy utilization rate.

[0164] Step g: Optimize the initial structure of the lighting area according to the second preset lighting area evaluation function to obtain the optimized lighting area lens structure.

[0165] It is understood that the above optimization can be carried out using successive approximation optimization algorithm, automatic image quality balancing optimization algorithm or other optimization algorithms, and this embodiment does not limit this.

[0166] Step h: Simulate the optimized illumination area lens structure to determine whether the illuminance and light energy utilization obtained from the simulation meet the preset system design requirements;

[0167] Step g: If so, the optimized illumination area lens structure shall be used as the illumination area lens design.

[0168] Furthermore, it should be noted that if the illuminance and light energy utilization rate obtained from the simulation do not meet the preset system design requirements, the above-mentioned equipment can reset the second preset lighting area evaluation function or modify the structural parameters of the lighting area to continue optimization until the illuminance and light energy distribution of the target field are met.

[0169] Continue as Figure 2 As shown, step S30: Determine the collimation area splicing point according to the collimation area lens design, and determine the illumination area splicing point according to the illumination area lens design;

[0170] It should be noted that the above-mentioned collimation area splicing point can be a coordinate point used to connect the collimation area and the splicing area, and the above-mentioned lighting area splicing point can be a coordinate point used to connect the lighting area and the splicing area.

[0171] Furthermore, in order to accurately obtain the splicing points of the collimation area and the lighting area, step S30 above includes:

[0172] Step S31: Determine the position information of the light spot at the edge of the collimation region and the position information of the point on the edge of the collimation region mirror based on the collimation region lens design;

[0173] It is understandable that the position of the edge spot of the collimation region can be the intersection point of the edge beam emitted by the edge spot of the first laser source on the curved surface of the collimation region mirror, and the position of the edge point of the collimation region mirror can be the position of the curved surface of the collimation region mirror furthest from the optical axis.

[0174] Step S32: Determine the collimation region splicing point based on the position information of the light spot at the edge of the collimation region and the position information of the mirror edge point in the collimation region;

[0175] It should be understood that the above-mentioned collimation area splicing point can be selected from the position of the light spot at the edge of the collimation area and the position of the mirror edge point of the collimation area.

[0176] Step S33: Determine the position information of the light spot at the edge of the illumination area and the position information of the mirror edge point in the illumination area based on the lens design of the illumination area;

[0177] Step S34: Determine the splicing point of the lighting area based on the position information of the light spot at the edge of the lighting area and the position information of the mirror edge point of the lighting area.

[0178] It should be noted that the splicing points of the above-mentioned lighting areas can be selected from the positions of the light spots at the edge of the lighting areas and the positions of the mirror edges of the lighting areas.

[0179] For ease of understanding, please refer to Figure 9 Please provide an explanation, such as Figure 9As shown in Figure (9-1), in conjunction with the above description, the splicing point on the first collimation surface s1 can be selected from the surface between points D and J; the splicing point on the first illumination surface s1' can be selected from the surface between points D' and J'; the splicing point on the second collimation surface s2 can be selected from the surface between points E and K; the splicing point on the second illumination surface s2' can be selected from the surface between points E' and K'; the splicing point on the third collimation surface s3 can be selected from the surface between points F and L; and the splicing point on the third illumination surface s3' can be selected from the surface between points F' and L'. The splicing points on the fourth collimation surface s4 can be selected from the surface between points G and M. The splicing points on the fourth illumination surface s4' can be selected from the surface between points G' and M'. The splicing points on the fifth collimation surface s5 can be selected from the surface between points H and N. The splicing points on the fifth illumination surface s5' can be selected from the surface between points H' and N'. The splicing points on the sixth collimation surface s6 can be selected from the surface between points I and O. The splicing points on the sixth illumination surface s6' can be selected from the surface between points I' and O'.

[0180] Step S40: The collimation area lens design and the illumination area lens design are spliced ​​together according to the collimation area splicing point and the illumination area splicing point to obtain an optical lens that includes the collimation area, the illumination area and the splicing area.

[0181] It should be noted that the above-mentioned equipment can splice the collimation area and the illumination area using simple spherical or planar surface shapes. Alternatively, it can splice the areas by applying continuity constraints based on the surface shapes at the splicing points of the collimation area and the surface shapes at the splicing points of the illumination area, thereby reducing the processing cost of the spliced ​​surface shapes.

[0182] To facilitate understanding of the method of splicing together simple spherical or planar surfaces, combined with Figure 9 Please provide an explanation, such as Figure 9 As shown in (9-1) and (9-2), the distances of points K' and E' in the z-axis direction from the emitting surface of the second laser source are equal to the distance of point K in the z-axis direction from the emitting surface of the first laser source; the distances of points L' and F' in the z-axis direction from the emitting surface of the second laser source are equal to the distance of point L in the z-axis direction from the emitting surface of the first laser source; the distances of points M' and G' in the z-axis direction from the emitting surface of the second laser source are equal to the distance of point M in the z-axis direction from the emitting surface of the first laser source; the distances of points N' and H' in the z-axis direction from the emitting surface of the second laser source are equal to the distance of point N in the z-axis direction from the emitting surface of the first laser source; and the distances of points O' and I' in the z-axis direction from the emitting surface of the second laser source are equal to the distance of point O in the z-axis direction from the emitting surface of the first laser source.

[0183] The second splicing surface f2 can be the surface where point K is connected to point K' in the y-axis direction; the third splicing surface f3 can be the surface where point L is connected to point L' in the y-axis direction; the fourth splicing surface f4 can be the surface where point M is connected to point M' in the y-axis direction; the fifth splicing surface f5 can be the surface where point N is connected to point N' in the y-axis direction; and the sixth splicing surface f6 can be the surface where point O is connected to point O' in the y-axis direction. Finally, the lens corresponding to the third illumination surface s3' is a flat glass with the same material and thickness as the lens corresponding to the third collimating surface s3; and the lens corresponding to the fifth illumination surface s5' is a flat glass with the same material and thickness as the lens corresponding to the fifth collimating surface s5.

[0184] For the splicing of the first illumination surface s1' and the first collimation surface s1, since the other illumination surfaces and collimation surfaces were designed with the assembly tolerance of the collimation and illumination integrated mirror in mind and the splicing distance reserved, the first splicing surface f1 is only a transition area and does not image the beams of the first laser source and the beams of the second laser source. Therefore, the influence of the continuity of the splicing point on the imaging performance can be disregarded. The first splicing surface f1 can be formed by a spherical surface. The surfaces of the second splicing surface f2 to the sixth splicing surface f6 are all planar.

[0185] For the assembled optical lenses, such as Figure 9 As shown in (9-2), the surface formed by splicing the first collimating surface s1 and the first illumination surface s1' through the first splicing surface f1 is the first optical surface p1; the surface formed by splicing the second collimating surface s2 and the second illumination surface s2' through the second splicing surface f2 is the second optical surface p2; the surface formed by splicing the third collimating surface s3 and the third illumination surface s3' through the third splicing surface f3 is the third optical surface p3; the surface formed by splicing the fourth collimating surface s4 and the fourth illumination surface s4' through the fourth splicing surface f4 is the fourth optical surface p4; the surface formed by splicing the fifth collimating surface s5 and the fifth illumination surface s5' through the fifth splicing surface f5 is the fifth optical surface p5; and the surface formed by splicing the sixth collimating surface s6 and the sixth illumination surface s6' through the sixth splicing surface f6 is the sixth optical surface p6.

[0186] This embodiment obtains the optical system parameters of the collimation region, determines the initial structure of the collimation region, and optimizes the initial structure based on the optical system parameters to obtain the collimation region lens design. It then obtains the optical system parameters of the illumination region, determines the boundary conditions of the illumination region based on the collimation region lens design, determines the initial structure of the illumination region, and optimizes the initial structure based on the optical system parameters and boundary conditions to obtain the illumination region lens design. Finally, it determines the collimation region splicing point based on the collimation region lens design and the illumination region splicing point. The collimation region lens design and the illumination region lens design are then spliced ​​together according to the collimation region splicing point and the illumination region splicing point to obtain an optical lens containing the collimation region, the illumination region, and the splicing region. This optical lens is then used on a 3D projector to reduce 3D projection speed. The cost and size of the structured light projector make it suitable for applications where size is a constraint, such as mobile terminals and AR / VR scenarios. In the field of facial payment, the structured light projector incorporates a flood illuminator to emit uniform infrared light, forming a uniform infrared image on an infrared camera for facial recognition and detection. The 3D projector provided in this embodiment can also be applied to this scenario. Since this embodiment saves on a flood illuminator component, it reduces the overall material and assembly costs of the 3D projector. Furthermore, by combining the functions of a structured light projector and a flood illuminator into a single projector, the 3D projector provided in this embodiment can simultaneously support both functions. The structured light projector enables high-precision short-range distance measurement, while the ToF projector enables long-range measurement, meeting the ranging requirements for different distances and expanding the projector's application scenarios.

[0187] To reduce the processing cost of the first splicing surface f1, the aforementioned equipment can also apply continuity constraints based on the surface shape at the splicing point in the collimation region and the surface shape at the splicing point in the illumination region for splicing. Zero-order continuity indicates that the two surfaces have the same function value at the splicing point, while first-order continuity indicates that the two surfaces not only have the same function value but also the same first-order derivative value at the splicing point. For optical lenses, it is generally considered that at least first-order continuity is required, such as... Figure 9 and Figure 10 As shown, after step S40 above, the following steps are also included:

[0188] Step S41: Obtain the location information of the collimation region splicing point and the curve function of the collimation region at the collimation region splicing point;

[0189] It should be noted that the above curve function can be obtained based on the above collimation region lens design, and the above collimation region splicing point position information can be obtained based on... Figure 9 The coordinates are obtained according to the specified direction.

[0190] Step S42: Based on the location information of the collimation region splicing point and the curve function of the collimation region at the collimation region splicing point, and based on the first preset condition, constrain the curve function of the splicing region at the collimation region splicing point to obtain the first constraint result;

[0191] It should be noted that the first preset constraint condition mentioned above is:

[0192]

[0193] In the formula, z F (x,y D ) represents the curve function of the first splicing surface f1 at point D, which is also the curve function of the splicing region at the splicing point of the collimation region. D (x,y D The curve function of the first collimated surface s1 at point D is the curve function of the collimated region at the point where the collimated regions meet. The x and y values ​​mentioned above... D All of these are location information for the splicing points of the collimation area.

[0194] Step S43: Obtain the location information of the splicing point of the lighting area and the curve function of the lighting area at the splicing point;

[0195] Step S44: Based on the location information of the splicing point of the lighting area and the curve function of the lighting area at the splicing point of the lighting area, and based on the second preset condition, constrain the curve function of the splicing area at the splicing point of the lighting area to obtain the second constraint result;

[0196] Understandably, the second pre-defined constraint is as follows:

[0197]

[0198] In the formula, z F (x,y D’ ) represents the curve function of the first splicing surface f1 at point D', which is the curve function of the splicing area at the splicing point of the lighting area. D′ (x,y D′ The curve function of the first lighting surface s1' at point D' is the curve function of the lighting area at the junction of the lighting areas. The x and y values ​​mentioned above... D′ All of these are location information for the splicing points of the lighting area.

[0199] Step S45: Determine the curve function of the splicing region based on the first constraint result and the second constraint result, determine the mirror design of the splicing region based on the curve function of the splicing region, and splice the mirror design of the collimation region and the mirror design of the illumination region according to the mirror design of the splicing region to obtain an optical lens containing the collimation region, the illumination region and the splicing region.

[0200] To better illustrate the results after constraints, Figure 10 As shown, Figure 10 Compared to the first optical surface p1 in (10-2) Figure 9 From the first optical surface p1 in (9-2), it can be seen that the splicing area required for the constrained first optical surface is simple to process, which reduces the processing cost.

[0201] Furthermore, for subsequent production, it is necessary to obtain the vector equation of the first optical surface p1.

[0202] The equation for the elevation of the first optical surface p1 is:

[0203]

[0204] In the formula, r1 is the radial radius of the first collimated surface s1, r2 is the radial radius of the first illumination surface s1', c1 is the curvature of the first collimated surface s1, c2 is the curvature of the first illumination surface s1', k1 is the conic coefficient of the first collimated surface s1, j2 is the conic coefficient of the first illumination surface s1', and α i Let α be the even-order aspherical coefficient of the first collimated surface s1. i The even-order aspheric coefficient of the first illumination surface s1' is given by the following embodiment: both the first collimation surface s1 and the first illumination surface s1' are even-order aspheric surfaces with surface shapes symmetrical about the optical axis. Figure 10 As shown, the collimation region 1 has the optical axis Z... 准 And the illumination area 2 optical axis Z 照 The spacing along the y-axis is Δy, Z 准 The intersection point between the first optical surface p1 and the first optical surface p1 is U. z1(x,y) is the equation of the elevation of the first optical surface p1 with the coordinates of point U as the origin. f(x,y) is the function equation of the distance between the first splicing surface f1 and point U in the z-axis direction. Depending on whether the first splicing surface f1 is a sphere or a continuous surface, it has different expressions.

[0205] The first collimation surface s1 and the first illumination surface s1' can also be designed as odd-order aspherical surfaces or binary surfaces. Extending to odd / even-order aspherical surfaces and freeform surfaces, if the first illumination surface s1' is a freeform surface, then the elevation equation of the first optical surface p1 can be replaced by equation (3) of the elevation equation of the freeform surface. The elevation equation of the freeform surface is:

[0206]

[0207] In the formula, z1(x,y) is the vector equation of the first optical surface p1 with the coordinates of point U as the origin, c2 is the curvature of the first illumination surface s1', and r2 is the radial radius of the first illumination surface s1'. k2 is the conic coefficient of the first illumination surface s1', N is the sum of the polynomial coefficients in the series, and A j For freeform surface coefficients.

[0208] The above freeform surface expressions are not limited to the extended polynomial form; they can also be expressed using Zernike Fringe, Zernike Standard, and other expressions.

[0209] Similarly, when the second collimated surface s2 is an even-order aspherical surface, the equation for the vector height of the second optical surface p2 is:

[0210]

[0211] In the formula, z2(x,y) is the elevation equation of the second optical surface p2 with the coordinates of point U as the origin, c3 is the curvature of the second collimated surface s2, and r3 is the radial radius of the second collimated surface s2. k3 is the conic coefficient of the second collimated surface s2, α k Let f2 be the even-order aspherical coefficient of the second collimated surface s2. Both the second splicing surface f2 and the second illumination surface s2' are planes, and the distances between the second splicing surface f2, the second illumination surface s2', and point U in the z-axis direction are equal to the distances between points L, L', and F' and point U in the z-axis direction. L Let L be the distance between points L and U along the z-axis.

[0212] The vector height data format of the third optical surface p3 to the sixth optical surface p6 is the same as the vector height equation of the second optical surface p2. They will not be explained one by one here. The vector height equations of each surface obtained above will be used for subsequent production.

[0213] Other embodiments or specific implementations of the algorithmic trading evaluation device of the present invention can be referred to the above-described method embodiments, and will not be repeated here.

[0214] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0215] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0216] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as read-only memory / random access memory, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0217] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A 3D projector, characterized in that, The 3D projector includes: a circuit board, a first laser source, a second laser source, a collimating and illumination integrated mirror, and diffractive optical elements; The first laser source and the second laser source are spaced apart and disposed on the same side of the circuit board. The circuit board is electrically connected to the first laser source and the second laser source. The collimating and illumination integrated lens is disposed above the first laser source and the second laser source. The bottom of the lens barrel of the collimating and illumination integrated lens is fixedly connected to the circuit board, and the top of the lens barrel of the collimating and illumination integrated lens is fixedly connected to the diffractive optical element. The circuit board is used to supply power to the first laser source and the second laser source at different time intervals; The first laser source is used to emit structured light to the collimating illumination integrated mirror when powered on; The collimating and illumination integrated lens is used to collimate and image the received structured light to obtain a clear light spot pattern; The diffractive optical element is used to copy and diffuse the clear spot pattern to obtain a structured spot pattern with a larger field of view; The second laser source is used to emit floodlight to the collimating illumination integrated mirror when powered on; The collimating illumination integrated lens is also used to compress and image the divergence angle of the received floodlight to obtain a blurred spot image. The diffractive optical element is also used to copy and diffuse the blurred spot pattern to obtain a uniform infrared spot pattern with a larger field of view. The collimating and illumination integrated mirror further includes: an optical lens, which includes a collimating region, an illumination region, and a splicing region; The splicing area is connected to both the collimation area and the lighting area. The collimation region is used to collimate and image the received structured light to obtain a clear light spot pattern; The illumination area is used to compress and image the divergence angle of the received floodlight to obtain a blurred spot pattern. The splicing area is used to prevent light beams projected onto the collimation area from entering the illumination area, and to prevent light beams projected onto the illumination area from entering the collimation area.

2. The 3D projector as claimed in claim 1, characterized in that, The splicing area has been sandblasted.

3. A method for designing an optical lens, characterized in that, The optical lens includes a collimation region, an illumination region, and a splicing region; the design method includes: Obtain the optical system parameters of the collimation region, determine the initial structure of the collimation region, and optimize the initial structure of the collimation region based on the optical system parameters of the collimation region to obtain the collimation region lens design; Obtain the optical system parameters of the illumination region, determine the boundary conditions of the illumination region based on the boundary conditions of the collimation region lens design, determine the initial structure of the illumination region, and optimize the initial structure of the illumination region according to the optical system parameters and boundary conditions of the illumination region to obtain the lens design of the illumination region. The collimation area splicing point is determined according to the collimation area lens design, and the illumination area splicing point is determined according to the illumination area lens design. The collimation region lens design and the illumination region lens design are spliced ​​together according to the collimation region splicing point and the illumination region splicing point to obtain an optical lens that includes the collimation region, the illumination region and the splicing region; After the steps of obtaining the optical system parameters of the collimation region, determining the initial structure of the collimation region, and optimizing the initial structure of the collimation region based on the optical system parameters of the collimation region to obtain the collimation region lens design, the method further includes: Determine the light source distribution field of the second laser source; The distance range between the lens in the illumination area and the second laser source is determined based on the lens boundary position in the collimation area lens design. Determine the target light field distribution of the collimation region lens design at the optimal working distance; Based on the light source distribution field and the target light source distribution field, obtain discrete coordinate information that meets the preset requirements; The discrete coordinate information is fitted using a preset algorithm, and the initial structure of the lighting area is obtained based on the fitting result and the distance range. A second preset lighting area evaluation function is constructed based on the average standard deviation of the target surface illuminance and the light energy utilization rate. The initial structure of the lighting area is optimized according to the second preset lighting area evaluation function to obtain the optimized lighting area lens structure; The optimized illumination area lens structure is simulated to determine whether the illuminance and light energy utilization obtained from the simulation meet the preset system design requirements. If so, the optimized illumination area lens structure shall be used as the illumination area lens design. Alternatively, the steps of obtaining the optical system parameters of the illumination region, determining the boundary conditions of the illumination region based on the boundary conditions of the collimation region lens design, determining the initial structure of the illumination region, and optimizing the initial structure of the illumination region according to the optical system parameters and boundary conditions of the illumination region to obtain the lens design of the illumination region include: Obtain the optical system parameters of the illumination area, determine the boundary conditions of the illumination area based on the boundary conditions of the collimation area lens design, and determine the initial structure of the illumination area based on the historical illumination area lens design; The lens design parameters of the illumination area are determined based on the optical system parameters of the illumination area, the boundary conditions of the illumination area, and the initial structure of the illumination area. By setting the variable parameters in the lens design parameters of the lighting area as variables, the variable parameters of the lighting area are obtained. The initial structure of the lighting area is optimized according to the first preset lighting area evaluation function to obtain the optimized lighting area lens structure; The optimized illumination area lens structure is simulated, and it is determined whether the simulated values ​​of the illumination area lens design image quality evaluation parameters meet the preset system design requirements. If so, the optimized illumination area lens structure will be used as the illumination area lens design.

4. The optical lens design method as described in claim 3, characterized in that, The steps of obtaining the optical system parameters of the collimation region, determining the initial structure of the collimation region, and optimizing the initial structure of the collimation region based on the optical system parameters of the collimation region to obtain the collimation region lens design include: Obtain the optical system parameters of the collimation region, and determine the initial structure of the collimation region based on the historical collimation region lens design; The collimation region lens design parameters are determined based on the optical system parameters of the collimation region and the initial structure of the collimation region. By setting the variable parameters in the collimation zone lens design parameters as variables, the collimation zone variable parameters are obtained. The initial structure of the collimation region is optimized according to the preset collimation region evaluation function to obtain the optimized collimation region lens structure; The optimized collimation region lens structure is simulated, and it is determined whether the values ​​of the collimation region lens design image quality evaluation parameters obtained from the simulation meet the preset system design requirements. If so, the optimized collimation region lens structure will be used as the collimation region lens design.

5. The optical lens design method as described in claim 4, characterized in that, The image quality evaluation parameters for the collimation zone lens design include at least one of the following: collimation, spot size at the optimal working distance, MTF, camera contrast, and distortion.

6. The optical lens design method as described in claim 3, characterized in that, The image quality evaluation parameters for the lens design in the illumination area include at least one of the following: spot size at the optimal working distance, spot overlap, and light energy utilization.

7. The method for designing an optical lens as described in any one of claims 3 to 6, characterized in that, The steps of determining the collimation area splicing point based on the collimation area lens design and determining the illumination area splicing point based on the illumination area lens design include: The position information of the light spot at the edge of the collimation region and the position information of the point on the edge of the collimation region mirror are determined based on the collimation region lens design. The collimation region splicing point is determined based on the position information of the light spot at the edge of the collimation region and the position information of the mirror edge point in the collimation region. Based on the lens design of the illumination area, determine the position information of the light spot at the edge of the illumination area and the position information of the mirror edge point in the illumination area; The splicing point of the lighting area is determined based on the position information of the light spot at the edge of the lighting area and the position information of the mirror edge point of the lighting area.

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