A high uniformity speckle projector

Abstract

A high uniformity speckle projector, characterized by comprising: a laser for emitting laser light; a compound eye homogenizing lens located on the optical path of the laser light, used to adjust the laser light incident from different directions to be emitted at 0°; an integral lens located on the emission optical path of the compound eye homogenizing lens, used to converge the laser light emitted from the compound eye homogenizing lens and evenly mix it at the focal plane; a field of view lens located between the integral lens and the focal plane, used to correct the angle of the laser light emitted from the integral lens, so that the main light of each field of view is vertically incident on the focal plane; a speckle lens array located between the field of view lens and the focal plane, used to form a speckle pattern with the laser light emitted from the field of view lens. The present invention can overcome the uneven illumination of the projection speckle existing in the existing speckle projection scheme, and the uniformity of the projection speckle is not affected by the light source, and has high system reliability.

Description

Technical Field

[0001] The present invention relates to the field of laser projection technology, and in particular to a high-uniformity speckle projector. Background Art

[0002] In the application of face recognition equipment, palm print and vein recognition equipment, sweeping robots, laser radar and other technical applications, it usually includes a projection end that emits light and a receiving end that collects images. The current conventional solution for the transmitting end is the Vcsel+DOE speckle projector. The principle is that the Vcsel projects a zero-order speckle pattern with a small divergence angle through a collimator, and then replicates it into a projection pattern with a larger divergence angle through the DOE. Since there are multiple light-emitting holes on the DOE, there is brightness inconsistency due to the process. At the same time, the DOE used to replicate the speckle pattern will also be affected by the process, resulting in illumination deviations of different levels of projected speckles. The unevenness of the speckle illumination will affect the detection distance and accuracy.

[0003] The disclosure of the above background technology content is only used to assist in understanding the inventive concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0004] To this end, the present invention proposes a high-uniformity speckle projector, which can overcome the non-uniformity of projection speckle illumination in existing speckle projection schemes, and the projection speckle uniformity in this scheme is not affected by the light source, and has high system reliability.

[0005] The present invention provides a high-uniformity speckle projector, characterized by comprising:

[0006] Laser, used for emitting laser light;

[0007] A compound-eye light homogenizing lens is located on the optical path of the laser and is used to adjust the lasers incident from different directions to emit at 0°;

[0008] An integrating lens, located on the outgoing light path of the compound eye homogenizing lens, is used to converge the laser light emitted by the compound eye homogenizing lens and evenly mix it at the focal plane;

[0009] A field of view lens, located on the outgoing light path of the integrator lens, and used to correct the angle of the laser emitted by the integrator lens so that the main light of each field of view is perpendicular to the focal plane;

[0010] The speckle lens array is located on the outgoing light path of the field lens and is used to form a speckle pattern from the laser light emerging from the field lens.

[0011] Optionally, the high-uniformity speckle projector is characterized in that the compound eye homogenizing lens includes a differential array and a field of view array;

[0012] The differential array is located at the light incident side and is used to differentiate the incident light beam into a number of units and project them toward the field of view array;

[0013] The field of view array is located on the light-emitting side and is used to adjust light beams incident from different directions so that the main light of each field of view is emitted at 0°;

[0014] The differential array and the field of view array have the same array.

[0015] Optionally, the high-uniformity speckle projector is characterized in that it also includes a collimator between the laser and the compound-eye homogenizing lens, for collimating the laser emitted by the laser.

[0016] Optionally, the high-uniformity speckle projector is characterized in that the collimating lens comprises a first cylindrical surface and a second cylindrical surface;

[0017] The axial direction of the first cylindrical surface is perpendicular to the fast axis direction of the laser, and is used to collimate the laser in the fast axis direction of the laser;

[0018] The axial direction of the second cylindrical surface is perpendicular to the slow axis direction of the laser, and is used to collimate the laser light in the slow axis direction of the laser.

[0019] Optionally, the highly uniform speckle projector is characterized in that the center positions of the speckle lens arrays are randomly arranged and have equal focal length characteristics.

[0020] Optionally, the highly uniform speckle projector is characterized in that the laser incident on the speckle lens array is a parallel and uniform rectangular light field.

[0021] Optionally, the high-uniformity speckle projector is characterized by further comprising: a projection lens, used to amplify the laser light passing through the focal plane and the speckle lens array and then project it;

[0022] The object focal plane of the projection lens is aligned with the focal plane.

[0023] Optionally, the high-uniformity speckle projector is characterized in that the compound eye homogenizing lens is a double-sided compound eye homogenizing lens or two single-sided compound eye homogenizing lenses.

[0024] Optionally, the highly uniform speckle projector is characterized by further comprising: a first reflector, located between the integrator lens and the field of view lens, for changing the direction of the laser.

[0025] Optionally, the high-uniformity speckle projector is characterized in that it also includes: a second reflector, located between the first reflector and the field of view lens, for receiving the laser from the first reflector and changing the direction of the laser again.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The integral lens in the present invention can converge the light from each field of view of the compound eye homogenizing lens and mix them at the focal plane, so that each point on the focal plane can collect all the mixed light from the compound eye homogenizing lens, so that the unevenness caused by the divergence angle of the laser and the light distribution is eliminated by the mixed light, so that the laser has very high consistency.

[0028] In the present invention, the uniformity of the speckle is not affected by the brightness consistency of the laser light-emitting hole, and thus is more uniform.

[0029] In the present invention, the uniformity of the speckle is not affected by the brightness difference of different diffraction orders of the DOE, and thus is more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings in the following descriptions are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work. By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes and advantages of the present invention will become more obvious:

[0031] Figure 1 Schematic diagram of the structure of a high uniformity speckle projector in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of a uniform light path in an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of a compound eye light homogenizing lens in an embodiment of the present invention;

[0034] Figure 4 Schematic diagram of another compound eye light homogenizing lens in an embodiment of the present invention;

[0035] Figure 5 Schematic diagram of the structure of another high uniformity speckle projector in an embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of laser fast axis alignment in an embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the slow axis alignment of a laser in an embodiment of the present invention;

[0038] Figure 8 A schematic diagram of a speckle generation and projection light path in an embodiment of the present invention;

[0039] Fig. 9 Schematic diagram of the structure of another high uniformity speckle projector in an embodiment of the present invention;

[0040] Fig.10 Schematic diagram of the structure of another high-uniformity speckle projector in an embodiment of the present invention.

[0041] 1-Laser;

[0042] 2- Collimator lens;

[0043] 3- Compound eye homogenizing lens;

[0044] 4- Integrating lens;

[0045] 5- first reflector;

[0046] 6- Field lens;

[0047] 7-speckle lens array;

[0048] 8-Focal plane;

[0049] 9- Projection lens;

[0050] 10- second reflecting mirror;

[0051] 31-differential array;

[0052] 32-field-of-view array;

[0053] 21- first cylindrical surface;

[0054] 22- second cylinder; DETAILED DESCRIPTION

[0055] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0056] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein, for example, can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0057] An embodiment of the present invention provides a high-uniformity speckle projector, which aims to solve the problems existing in the prior art.

[0058] The present invention provides a high-uniformity speckle projector, which shapes the light beam emitted by the laser into a collimated and uniform rectangular light field through a compound eye homogenization system, and then forms a speckle pattern through a speckle lens array, and finally projects it after magnification by a lens. It can overcome the non-uniformity of the illumination of the projected speckle existing in the existing speckle projection scheme, and the uniformity of the projected speckle is not affected by the light source, and has high reliability.

[0059] The following specific embodiments are used to describe in detail the technical solutions of the present invention and how the technical solutions of the present application solve the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0060] Figure 1 FIG. 1 is a schematic diagram of a high uniformity speckle projector according to an embodiment of the present invention. Figure 1 As shown, a high uniformity speckle projector in an embodiment of the present invention includes:

[0061] The laser 1 is used for emitting laser light.

[0062] Specifically, the laser is the light source of the entire system, responsible for emitting a laser beam with good monochromaticity and high coherence. The wavelength, power and other parameters of the laser beam are selected according to the specific application requirements. The laser has the characteristics of high brightness, good directionality and strong monochromaticity, which is the basis for generating high-quality speckle patterns. The laser can be various types of lasers such as Vcsel and EEL. The laser is mounted on a heat sink for fixation, or it can be fixed by other means.

[0063] The compound eye homogenizing lens 3 is located on the optical path of the laser and is used to adjust the laser light incident from different directions to emit at 0°.

[0064] Specifically, the compound eye homogenization lens is a specially designed lens system consisting of multiple lens units, each of which can independently adjust the direction of the incident light. By precisely controlling the optical parameters of each lens unit, the angle of the incident light can be adjusted so that all light is emitted at the same angle (i.e. 0°).

[0065] The integrator lens 4 is located on the outgoing light path of the compound eye homogenizing lens, and is used to converge the laser light emitted by the compound eye homogenizing lens and evenly mix it at the focal plane.

[0066] Specifically, an integrator lens is a lens with a specific shape and refractive index distribution that can focus the incident light onto a point. By passing the laser emitted from the compound eye homogenizing lens through the integrator lens, a uniformly mixed laser beam can be obtained at the focal plane.

[0067] The field of view lens 6 is located on the outgoing light path of the integrator lens and is used to correct the angle of the laser emitted by the integrator lens so that the main light of each field of view is perpendicular to the focal plane.

[0068] Specifically, the field of view lens is a lens used to adjust the direction of light propagation, so that the light can be evenly distributed in a specific area. By using the field of view lens, the angle of the laser emitted by the integrating lens can be corrected so that the main light of each field of view is perpendicular to the focal plane. By accurately designing the curvature and position of the field of view lens, the angle deviation introduced by the integrating lens can be effectively eliminated, and the imaging quality of the speckle pattern can be improved. In some embodiments, the field of view lens is located between the integrating lens and the focal plane, so that the main light of each field of view is perpendicular to the focal plane. In some embodiments, the field of view lens is located after the focal plane and is used to change the laser angle.

[0069] The speckle lens array 7 is located on the outgoing light path of the field lens and is used to form a speckle pattern from the laser light emerging from the field lens.

[0070] Specifically, the speckle lens array is a key component for generating speckle patterns. It consists of a plurality of tiny lenses or phase modulation elements, each of which can independently modulate the incident laser, thereby forming a speckle pattern with random distribution characteristics on the focal plane. The design of the speckle lens array determines the complexity and uniformity of the speckle pattern. By adjusting the parameters of the lens array (such as lens shape, spacing, phase distribution, etc.), speckle patterns of different shapes, sizes and contrasts can be generated to meet different application requirements. In some embodiments, the speckle lens array is located on the light incident side of the focal plane to form a speckle pattern before the focal plane 8, so that further processing can be performed on the focal plane. In some embodiments, the speckle lens array is located on the light exit side of the focal plane to form a speckle pattern when the laser exits.

[0071] It should be noted that the drawings of this specification are all described in the structural form that the field lens 6 and the speckle lens array 7 are located before the focal plane 8, but this does not mean that the field lens 6 and the speckle lens array 7 must be located before the focal plane 8. It can be understood by those skilled in the art that the positions of the field lens 6 and the speckle lens array 7 and the focal plane in the present invention can be arbitrary. The exemplary descriptions of the drawings of this specification and other parts of the specification should not be understood as limiting the positional relationship between the field lens 6 and the speckle lens array 7 and the focal plane 8 in the claims.

[0072] Figure 2 FIG. 1 is a schematic diagram of a light path of a homogenizing light in an embodiment of the present invention. After the laser is incident on the compound eye homogenizing lens 3, its width at the exit surface of the compound eye homogenizing lens 3 changes from D to D', which is reduced. The thickness of the compound eye homogenizing lens 3 is f Fly , which can be adjusted according to parameters such as laser width and angle. When passing through the compound eye homogenizing lens 3, the beam with a width of d before incident is irradiated on the light exit surface in the compound eye homogenizing lens 3 at an angle of 2α, and is emitted at an angle of 2β on the light exit surface. The compound eye homogenizing lens 3 allows the parallel incident beam to diffuse outward at an angle of 2β of the emission angle and irradiate on the integrator lens 4. The integrator lens 4 further diffuses the laser beam, and the direction approaches the central axis direction of the integrator lens 4, so that different laser beams are evenly distributed at the focal plane, that is, each position on the focal plane is irradiated by different beams, so that the light at the focal plane will not be different due to the difference between different beams. Therefore, the laser divergence angle and the unevenness of the collimated light are eliminated by mixing after the transformation of the compound eye homogenizing lens and the integrator lens, and a good mixing effect is achieved. The field of view lens 6 is located between the integrator lens 4 and the focal plane 7, and corrects the angle of the outgoing light from the integrator lens 4 so that the angle of the incident light at each position is u, so that the main light of each field of view is parallel to the incident focal plane. This embodiment makes the light path at the focal plane uniform and vertically incident, and various optical processing can be performed at the focal plane to achieve the best optical effect. For example, a filter or other optical device can be placed to achieve the best optical effect. Figure 2 The dimensions in also have the following relationship:

[0073] tanu=(D' / 2) / f int ;

[0074] tanβ=(H / 2) / f int ;

[0075] sinα=(d / 2) / f Fly .

[0076] In some embodiments, Figure 2 As shown, the compound eye homogenizing lens includes a differential array 31 and a field of view array 32;

[0077] The differential array 31 is located at the light incident side and is used to differentiate the incident light beam into a number of units and project them to the field of view array 32;

[0078] The field of view array 32 is located at the light output side and is used to adjust the light beams incident from different directions so that the main light of each field of view is emitted at 0°;

[0079] The differential array 31 and the field array 32 have the same array.

[0080] Specifically, the role of the differential array is to differentiate the incident light beam into several units and project them to the field of view array. This differentiation effect is achieved by splitting the larger incident light beam into many small sub-beams, each of which is then accurately projected onto the corresponding field of view array element. The field of view array is located on the light-emitting side and is used to adjust the light beams incident from different directions so that the main light of each field of view is emitted at 0°. By precisely controlling the optical parameters of each field of view array element, it can be ensured that all light beams processed by the compound eye uniformity lens have the same exit angle, thereby forming a uniform spot distribution on the target surface. In order to ensure that the light can maintain the consistency of its optical properties after passing through the differential array and the field of view array, the two arrays are usually designed to have the same array parameters, such as the same arrangement, size and shape. This design can minimize the optical loss and uniformity reduction caused by array mismatch when the light passes through the compound eye system.

[0081] like Figure 3 As shown, the compound eye homogenizing lens is a double-sided compound eye homogenizing lens. A double-sided compound eye homogenizing lens designs two groups of compound eye structures on a piece of material, and its front and back surfaces have different microstructure arrangements for the control of incident and outgoing light. The advantage of this design is that it reduces the alignment error of the lens array and reduces the assembly complexity of the system. Due to its compact structure, a double-sided compound eye homogenizing lens is suitable for application scenarios with limited space and high uniformity requirements.

[0082] like Figure 4 As shown, the compound eye homogenizing lens is two single-sided compound eye homogenizing lenses. Two single-sided compound eye homogenizing lenses are composed of two separate compound eye lenses, one side of each lens has a microstructure arrangement, and the other side is usually flat. Compared with a double-sided lens, this design provides more flexibility in adjustment and optimization, but it also puts higher requirements on assembly accuracy. Two single-sided compound eye homogenizing lenses are more suitable for scenes that have extremely high requirements for light efficiency and uniformity, and at the same time have a relatively loose assembly space.

[0083] Figure 5 FIG. 2 is a schematic diagram of the structure of another high uniformity speckle projector according to an embodiment of the present invention. Figure 5As shown, compared with the foregoing embodiment, another high-uniformity speckle projector in the embodiment of the present invention further includes a collimator 2 between the laser and the compound-eye homogenizing lens, for collimating the laser emitted by the laser.

[0084] The laser beam has a natural divergence angle after being emitted from the laser, which means that the beam will gradually expand as the propagation distance increases. If the divergent laser beam is directly irradiated on the compound eye homogenizing lens, an uneven light spot will be formed on the surface of the lens, thus affecting the homogenizing effect.

[0085] The collimator can transform the divergent beam from the laser into a parallel beam through a specific optical design. This transformation is a key step to ensure that the laser beam can be evenly irradiated on the compound eye homogenizing lens. The collimated laser beam has a consistent cross-sectional diameter, which enables the compound eye homogenizing lens to receive uniform light over its entire working area, thereby improving the homogenization efficiency and quality of the overall system.

[0086] The use of collimators not only optimizes the incident state of the light beam, but also reduces unnecessary optical loss and distortion caused by non-collimated light, further improving the performance of the entire optical system. The collimated light beam is more conducive to the processing and control of subsequent optical components, which is particularly important for applications that require extremely high optical precision.

[0087] In some embodiments, the collimator 2 includes a first cylindrical surface 21 and a second cylindrical surface 22;

[0088] The axial direction of the first cylindrical surface 21 is perpendicular to the fast axis direction of the laser, and is used to collimate the laser in the fast axis direction of the laser;

[0089] The axial direction of the second cylindrical surface 22 is perpendicular to the slow axis direction of the laser, and is used to collimate the laser light in the slow axis direction of the laser.

[0090] The output of a laser diode is usually anisotropic, that is, the divergence angles in the fast axis and slow axis directions are different, and need to be collimated separately. The Gaussian beam output by the laser has a natural divergence. Through the collimation of the cylindrical lens, the divergent beam can be effectively converted into a nearly parallel beam, which is crucial for the efficient operation of the subsequent optical system. The precisely collimated laser beam can significantly improve the imaging quality and light efficiency of the optical system, and reduce the distortion and energy loss caused by non-collimated light. This embodiment has no special requirements for the order of the first cylindrical surface 21 and the second cylindrical surface 22. The laser can pass through the first cylindrical surface 21 first and then the second cylindrical surface 22, or it can pass through the second cylindrical surface 22 first and then the first cylindrical surface 21.

[0091] like Figure 6As shown, the axial direction of the first cylindrical surface is perpendicular to the fast axis direction of the laser, and is specifically used to collimate the laser in the fast axis direction of the laser. The cylindrical lens only produces a focusing effect in the direction of its cylindrical axis, and does not affect the light in the vertical direction. This characteristic enables the first cylindrical surface to effectively control the laser divergence in the fast axis direction without interfering with the light distribution in the slow axis direction.

[0092] like Figure 7 As shown in the figure, the axial direction of the second cylindrical surface is perpendicular to the slow axis direction of the laser, and is responsible for collimating the laser in the slow axis direction of the laser. Similar to the first cylindrical surface, the second cylindrical surface also uses its cylindrical curved surface to focus or diverge the light, but only works in the slow axis direction. This ensures that the light beams in both directions are properly collimated, thereby improving the beam quality and meeting the input requirements of the subsequent optical system.

[0093] like Figure 8 As shown, the focal plane 8 also includes: a projection lens 9, which is used to amplify the laser light passing through the focal plane and the speckle lens array and then project it; the object focal plane of the projection lens is aligned with the focal plane.

[0094] The projection lens focuses and projects the incoming laser beam through its optical structure. The projection lens 9 is capable of receiving the laser light passing through the focal plane 8 and the speckle lens array 7, and amplifying the laser light through its optical properties (such as focal length, lens material, etc.). This means that after the laser beam passes through the projection lens, its parameters such as spot size, brightness or energy density may change to adapt to different application requirements. In addition to amplifying the laser light, the projection lens 9 is also responsible for projecting the amplified laser light to the target location. This usually requires the lens to have good imaging quality and projection accuracy to ensure that the laser light can accurately irradiate the predetermined target area.

[0095] The object focal plane of the projection lens must be precisely aligned with the focal plane of the system, which ensures that the light from the laser, through various optical components, reaches the projection lens, can be correctly focused and magnified. Any deviation may lead to inaccurate focus and affect system performance.

[0096] In some embodiments, the center positions of the speckle lens array are randomly arranged and have equal focal length characteristics. Each small lens (or unit lens) in the speckle lens array is not arranged according to a fixed geometric pattern (such as a rectangle, hexagon, etc.), but is randomly distributed in the area of ​​the array. This randomness can bring a variety of optical effects, such as increasing the complexity and randomness of the light field, thereby producing unique effects in the fields of imaging, lighting or laser speckle. Although the overall arrangement is random, each small lens has a clear center position. The distribution of these center positions in the array is random, but the optical properties inside each lens (such as focal length, curvature, etc.) are determined according to the design. Equal focal length means that all small lenses in the speckle lens array have the same focal length. Focal length is an important parameter of the lens, which determines the degree of convergence or divergence of light after passing through the lens. In a lens array with equal focal length, no matter which small lens the light is incident from, as long as the incident conditions are the same (such as incident angle, wavelength, etc.), the convergence point (or divergence) of the light after passing through the lens will have similar characteristics.

[0097] In some embodiments, the laser incident on the speckle lens array is a parallel and uniform rectangular light field. Compared with the traditional circular or elliptical light field, the rectangular light field can better meet the needs of many practical applications. For example, in the production test of flat-panel displays, large-area image projection, and certain types of laser processing, the rectangular light field can provide a more uniform and effective coverage area. The rectangular light field also helps to improve the utilization and efficiency of the optical system because it can produce a larger effective working area in a given optical system. This not only improves the efficiency of resource use, but also reduces energy consumption and operating costs.

[0098] Fig. 9 FIG. 2 is a schematic diagram of the structure of another high uniformity speckle projector according to an embodiment of the present invention. Fig. 9 As shown, compared with the above-mentioned embodiment, another high uniformity speckle projector in the embodiment of the present invention further includes:

[0099] The first reflector 5 is located between the integrator lens and the field lens, and is used to change the direction of the laser.

[0100] Specifically, the most direct function of the first reflector is to change the propagation direction of the laser beam. The first reflector in this embodiment only changes the direction of the optical path, and does not process the angle of the optical path itself, so it does not change the optical path propagation after the integrating lens. This embodiment is suitable for the original optical path layout that cannot meet specific space requirements, or for guiding the laser beam to a more suitable position for subsequent processing. In complex optical systems, the optical path layout is often limited by various factors, such as component size, installation space, heat dissipation requirements, etc. By introducing a reflector, the optical path layout can be flexibly adjusted without increasing the overall size of the system, making it more compact and efficient. In some cases, directly transmitting a laser beam may cause the optical path to be too long, thereby increasing the loss of light energy. By using a reflector, the laser beam can be guided to a shorter optical path, thereby reducing the loss of light energy and improving the efficiency of the system.

[0101] Fig.10 FIG. 2 is a schematic diagram of the structure of another high uniformity speckle projector according to an embodiment of the present invention. Fig.10 As shown, compared with the above-mentioned embodiment, another high uniformity speckle projector in the embodiment of the present invention further includes:

[0102] The second reflector 10 is located between the first reflector and the field lens, and is used to receive the laser from the first reflector and change the direction of the laser again.

[0103] Specifically, the second reflector is able to receive the laser beam reflected by the first reflector and change its propagation direction again as needed. This dual reflection mechanism allows the path of the laser beam to be adjusted more flexibly to adapt to complex spatial layouts or achieve specific optical effects. In optical systems, the optimization of the optical path layout is often constrained by many factors. By introducing a second reflector, the optical path layout can be further optimized without increasing the overall size or complexity of the system, making it more compact, efficient and in line with design requirements.

[0104] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other. The above description of the disclosed embodiments enables professionals and technicians in this field to implement or use the present invention. Various modifications to these embodiments will be obvious to professionals and technicians in this field, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown in this article, but will comply with the widest range consistent with the principles and novel features disclosed herein.

[0105] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A high uniformity speckle projector, characterized in that: include: Laser, used for emitting laser light; A compound-eye light homogenizing lens is located on the optical path of the laser and is used to adjust the lasers incident from different directions to emit at 0°; An integrating lens, located on the outgoing light path of the compound eye homogenizing lens, is used to converge the laser light emitted by the compound eye homogenizing lens and evenly mix it at the focal plane; A field of view lens, located on the outgoing light path of the integrator lens, and used to correct the angle of the laser emitted by the integrator lens so that the main light of each field of view is perpendicular to the focal plane; The speckle lens array is located on the outgoing light path of the field lens and is used to form a speckle pattern from the laser light emerging from the field lens.

2. A high uniformity speckle projector according to claim 1, characterized in that: The compound eye homogenizing lens includes a differential array and a field of view array; The differential array is located at the light incident side and is used to differentiate the incident light beam into a number of units and project them toward the field of view array; The field of view array is located on the light-emitting side and is used to adjust light beams incident from different directions so that the main light of each field of view is emitted at 0°; The differential array and the field of view array have the same array.

3. The high uniformity speckle projector according to claim 1, characterized in that: Also included between the laser and the compound-eye light homogenizing lens is a collimator lens for collimating the laser emitted by the laser.

4. The high uniformity speckle projector according to claim 3, characterized in that: The collimating mirror comprises a first cylindrical surface and a second cylindrical surface; The axial direction of the first cylindrical surface is perpendicular to the fast axis direction of the laser, and is used to collimate the laser in the fast axis direction of the laser; The axial direction of the second cylindrical surface is perpendicular to the slow axis direction of the laser, and is used to collimate the laser light in the slow axis direction of the laser.

5. The high uniformity speckle projector according to claim 1, characterized in that: The center positions of the speckle lens array are randomly arranged and have an equal focal length characteristic.

6. The high uniformity speckle projector according to claim 1, characterized in that: The laser light incident on the speckle lens array is a parallel and uniform rectangular light field.

7. The high uniformity speckle projector according to claim 1, characterized in that: Also includes: A projection lens, used for amplifying the laser light passing through the focal plane and the speckle lens array and then projecting it; The object focal plane of the projection lens is aligned with the focal plane.

8. The high uniformity speckle projector according to claim 1, characterized in that: The compound eye light homogenizing lens is a double-sided compound eye light homogenizing lens or two single-sided compound eye light homogenizing lenses.

9. The high uniformity speckle projector according to claim 1, characterized in that: Also includes: The first reflecting mirror is located between the integrator lens and the field lens and is used to change the direction of the laser.

10. The high uniformity speckle projector according to claim 9, characterized in that: Also includes: The second reflecting mirror is located between the first reflecting mirror and the field of view lens, and is used for receiving the laser from the first reflecting mirror and changing the direction of the laser again.

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