Beam shaping assembly and optical equipment

Abstract

The invention relates to a beam shaping assembly and optical equipment, the beam shaping assembly comprises a first-layer lens and a second-layer lens, the first-layer lens comprises a plurality of first micro-lenses, the first micro-lenses are distributed along a first direction and a second direction in an array mode, the second-layer lens comprises a plurality of second micro-lenses, the second micro-lenses are distributed along the first direction, and the second micro-lenses are distributed along the second direction. The first-layer lens and the second-layer lens are distributed along a third direction; wherein the first micro lens is provided with a first front surface and a first rear surface in the third direction, the second micro lens is provided with a second front surface and a second rear surface in the third direction, and the first layer lens is used for collimating and deflecting light emitted by the light-emitting device so that light emitted from the first rear surface can irradiate the second front surface; and the second layer of lens is used for deflecting and collimating the light irradiated to the second front surface so as to form a linear light spot in a far field. The first micro-lens and the second micro-lens are small in size, the light beam shaping element is small in size, and the device can be used for occasions with small space.

Description

Technical Field

[0001] The present application relates to the technical field of optical instruments, and in particular to a beam shaping component and an optical device. Background Art

[0002] The laser radar transmitter includes a laser light-emitting device and a beam shaping element for beam shaping. The laser light-emitting device and the beam shaping element cooperate with each other, and the beam shaping element integrates the light emitted by the laser light-emitting device into a beam with specific properties, and cooperates with other components of the laser radar to detect the target space. At present, a lens group is usually used to shape the light emitted by the laser light-emitting device. The lens group includes multiple lenses. Since the size and weight of the lenses are large, the size and weight of the beam shaping element are also large, which affects the user experience and is not suitable for occasions with small spaces. Summary of the invention

[0003] In a first aspect, the present application provides a beam shaping component, the beam shaping component comprising a first layer of lenses and a second layer of lenses, the first layer of lenses comprising a plurality of first micro lenses, each of the first micro lenses being arrayed along a first direction and a second direction, the second layer of lenses comprising a plurality of second micro lenses, each of the second micro lenses being arrayed along the first direction, and the first layer of lenses and the second layer of lenses being arrayed along a third direction; wherein the first micro lens has a first front surface and a first rear surface along the third direction, the second micro lens has a second front surface and a second rear surface along the third direction, the first layer of lenses is used to collimate and deflect light emitted by a light emitting device so that the light emitted from the first rear surface can irradiate the second front surface, and the second layer of lenses is used to deflect and collimate the light irradiated to the second front surface so as to form a line spot in a far field.

[0004] Therefore, the beam shaping component is used to convert the light emitted by the light-emitting device into a line spot in the far field. When it is used in an optical device, the optical device has the corresponding function. At the same time, the first microlens and the second microlens are both microlenses. In the optical system, the microlens is used to collect and diverge light, and the volume is small. It cannot be recognized by the human eye and can only be observed with a microscope, a scanning electron microscope, an atomic force microscope and other equipment. In the beam shaping element in the embodiment of the present application, since the volume of the first microlens and the second microlens is small, the volume and weight of the beam shaping element are small, and then the volume and weight of the optical device are small. The beam shaping element and the optical device can be used in occasions with small space.

[0005] In a specific embodiment, the optical axis of the first microlens deviates from its geometric center, and the optical axis of the second microlens deviates from its geometric center, so that the light emitted through the first microlens is deflected to be projected onto the second microlens, and the light emitted from the second microlens is deflected to form a line spot in the far field.

[0006] In a specific embodiment, the first front surface is a free-form surface, the first rear surface is a plane, and the second front surface and the second rear surface are both free-form surfaces. The free-form surface of the first microlens and the free-form surface of the second microlens in this embodiment can form a preset line spot in the far field, and the line width and divergence angle of the line spot meet the specific needs of the user.

[0007] In a specific embodiment, the first front surface, the second front surface and the second rear surface are any one of a spherical surface, a parabolic surface and a toroidal surface.

[0008] In a specific embodiment, the first microlens is an off-axis aspheric lens, and the second microlens is a far-field lens.

[0009] In a specific embodiment, the first layer of lenses includes m rows and n columns of first microlenses, the second layer of lenses includes 1 row and n columns of second microlenses, in the first layer of lenses, the jth first microlens in the i-th column is ij, and the i-th second microlens in the second layer of lenses is used to shape the light emitted from the first microlens in the i-th column; the coordinates of the optical axes of the second microlenses along the first direction are different, and the coordinates of the optical axes of the second microlenses along the second direction are the same, so that a small line spot formed in the far field by a structural unit composed of a column of first microlenses and one second microlens can be superimposed in the far field to form a preset line light spot, thereby avoiding the small line spots being staggered with each other, resulting in a decrease in the quality of the formed line light spot and affecting the accuracy of the optical device.

[0010] In a specific embodiment, the first layer of lenses and the second layer of lenses satisfy the following relationship:

[0011]

[0012]

[0013] i Δy =0;

[0014] Wherein, i is the coordinate of the geometric center of the ith second microlens along the first direction, i is the coordinate of the geometric center of the ith second microlens along the second direction, ij is the coordinate of the geometric center of the jth first microlens in the ith column along the first direction, ij is the coordinate of the geometric center of the jth first microlens in the ith column along the second direction; ij△ is the offset of the optical axis of the jth first microlens in the ith column relative to its geometric center in the first direction, ij△ is the offset of the optical axis of the jth first microlens in the ith column relative to its geometric center in the second direction, and i△ is the offset of the optical axis of the ith second microlens relative to the optical axis of the first microlens in the ith column in the second direction; the focal lengths of the first microlenses are the same and are h1, and along the third direction, the distance between the ith second microlens in the second layer of lenses and the first rear surface is h2.

[0015] In this embodiment, when a structural unit consisting of a row of first microlenses and a second microlens satisfies the above-mentioned constraints, each structural unit can form a small line spot in the far field, and the small line spots formed by multiple structural units are superimposed in the far field to form a line spot to meet the needs of users.

[0016] In a specific embodiment, the spacing h3 between the geometric centers of adjacent first microlenses along the first direction satisfies: 1≤h3≤5mm, and / or, the spacing h4 between the geometric centers of adjacent first microlenses along the second direction satisfies: 0.02mm≤h4≤0.1mm. The spacing h3 between the geometric centers of adjacent first microlenses along the first direction is related to the divergence angle of the far-field line spot. The larger h3 is, the smaller the divergence angle of the far-field line spot is. However, when h3 is too large, the volume of the beam shaping component will be too large. Therefore, the value of h3 can be selected based on a comprehensive consideration of the divergence angle of the line spot to be formed and the volume of the beam shaping component. When the spacing h4 between the geometric centers of adjacent first microlenses along the second direction is small, the overall volume of the beam shaping component can be reduced, thereby reducing the volume of the optical device.

[0017] In a specific embodiment, the aperture of each of the second microlenses is d, and the divergence angle of the far-field line spot formed by the beam shaping component is θ, satisfying:

[0018]

[0019] Here, λ is the wavelength of light.

[0020] In this embodiment, when the aperture of the second microlens satisfies the above relationship, the divergence angle of the line light spot formed on site can be made smaller to meet the needs of users.

[0021] In a specific embodiment, the aperture of the first microlens is less than or equal to 32 μm. The aperture of the first microlens will not be too large, so that the volume of the beam shaping component will not be too large.

[0022] A second aspect of an embodiment of the present application provides an optical device, the optical device comprising:

[0023] case;

[0024] A light emitting device, wherein the light emitting device is disposed in the housing;

[0025] A beam shaping assembly, the beam shaping assembly being mounted on the housing;

[0026] Wherein, the beam shaping component is the beam shaping component described above.

[0027] In this embodiment, when the beam shaping component of the optical device is realized by the first microlens and the second microlens, the volume and weight of the optical device are small, and it can be used in occasions with a small space. The optical device can also convert the light emitted by the light-emitting device into a far-field line spot to meet the needs of users.

[0028] In a specific embodiment, the light emitting device includes a plurality of point light sources, the plurality of point light sources are arrayed along the first direction and the second direction, and the point light sources correspond to the first microlenses one by one. In this embodiment, the beam shaping component can transform the light emitted by the arrayed point light sources into a far-field line light spot.

[0029] In a specific embodiment, the optical axis of the second microlens and the corresponding column of point light sources have the same coordinates along the first direction, which can prevent a plurality of small line spots formed by each structural unit from deviating from each other along the first direction, so that each small line spot can be superimposed in the far field along the first direction to form a line light spot, thereby improving the quality of the line light spot.

[0030] In a specific embodiment, along the first direction, the distance L1 between adjacent point light sources satisfies: 1≤L1≤5mm, and / or, along the second direction, the spacing L2 between adjacent point light sources satisfies: 0.02mm≤L2≤0.1mm. The distance L1 between adjacent point light sources along the first direction is related to the divergence angle of the far-field line light spot. The larger L1 is, the smaller the divergence angle of the far-field line light spot is. However, when L1 is too large, the volume of the beam shaping component will be too large. Therefore, the value of L1 can be selected based on a comprehensive consideration of the divergence angle of the line light spot to be formed and the volume of the beam shaping component. When the spacing L2 between adjacent point light sources along the second direction is small, the overall volume of the beam shaping component can be reduced, thereby reducing the volume of the optical device.

[0031] In a specific embodiment, the optical device is a lidar transmitter.

[0032] In a specific embodiment, the optical device is a laser projector.

[0033] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of the principles of a light emitting device and a beam shaping component of an optical device provided by the present application in a specific embodiment;

[0035] Figure 2 for Figure 1 A schematic diagram from another perspective;

[0036] Figure 3 for Figure 1 Schematic diagram of the local structure of the beam shaping component;

[0037] Figure 4 for Figure 3 A schematic structural diagram of the first microlens and the second microlens in a specific embodiment;

[0038] Figure 5 for Figure 3 A schematic structural diagram of the first microlens and the second microlens in another specific embodiment;

[0039] Figure 6 for Figure 3 A schematic structural diagram of the first microlens and the second microlens in another specific embodiment;

[0040] Figure 7 for Figure 3 An optical path diagram of the first microlens and the second microlens in a specific embodiment;

[0041] Figure 8 for Figure 2 A partial schematic diagram of

[0042] Fig. 9 for Figure 8 A schematic diagram from another perspective;

[0043] Fig.10 for Figure 2 A schematic diagram of a midpoint light source in a specific embodiment.

[0044] Reference numerals:

[0045] 11-first layer lens;

[0046] 111- a first microlens;

[0047] 111a - first front surface;

[0048] 111b - first rear surface;

[0049] 12- second layer lens;

[0050] 121- a second microlens;

[0051] 121a - second front surface;

[0052] 121b - second rear surface;

[0053] 2-light emitting device;

[0054] 21-Point light source;

[0055] 4-line spot.

[0056] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0057] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0058] In a specific embodiment, the present application is further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0059] The present application provides an optical device and a beam shaping component, such as Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of an optical device provided in an embodiment of the present application. Figure 2 for Figure 1 The optical device comprises a housing, a light emitting device 2 and a beam shaping component, wherein the light emitting device 2 and the beam shaping component are both mounted in the housing, and the housing protects the light emitting device 2 and the beam shaping component.

[0060] like Figure 3 As shown, Figure 3 for Figure 1 Schematic diagram of the structure of the beam shaping component. The beam shaping component includes a first layer lens 11 and a second layer lens 12. The light emitting device 2, the first layer lens 11 and the second layer lens 12 are distributed along a third direction Z. The light emitted by the light emitting device 2 is shaped by the first layer lens 11 and the second layer lens 12. Figure 2As shown, the first layer of lenses 11 includes a plurality of first microlenses 111, each of which is distributed in an array along a first direction X and a second direction Y. The second layer of lenses 12 includes a plurality of second microlenses 121, each of which is distributed along the first direction X, that is, each of which corresponds to a column of first microlenses 111 distributed along the second direction Y.

[0061] Among them, the first microlens 111 and the second microlens 121 are both microlenses. In the optical system, the microlens is used to collect and diverge light, and has a small volume and cannot be recognized by the human eye. It can only be observed with a microscope, a scanning electron microscope, an atomic force microscope, etc. In the beam shaping element in the embodiment of the present application, since the first microlens 111 and the second microlens 121 are small in volume, the volume and weight of the beam shaping element are small, and then the volume and weight of the optical device are small. The beam shaping element and the optical device can be used in occasions with small space.

[0062] It should be noted that, in the embodiment of the present application, the first direction X may be the line width direction of the line spot 4, the second direction Z may be the divergence angle direction of the line spot 4, and the third direction Z is a direction perpendicular to the plane where the first direction X and the second direction Y are located.

[0063] Specifically, Figure 4-6 As shown, Figure 4-6 for Figure 3 Schematic diagram of the structure of the first microlens and the second microlens. The first microlens 111 has a first front surface 111a and a first rear surface 111b along the third direction Z, and the second microlens 121 has a second front surface 121a and a second rear surface 121b along the third direction Z. Along the third direction Z, the first rear surface 111b faces the second front surface 121a. When the optical device and the beam shaping component are working, Figure 1 and Figure 2 As shown, combined with Figure 7 , Figure 7 Schematic diagram of the optical path of the first microlens 111 and the second microlens 121. The light emitted by the light emitting device 2 can irradiate the first front surface 111a of a row of first microlenses 111. The first microlens 111 can collimate and deflect the light irradiated to the first microlens 111, so that the light emitted through the first rear surface 111b of the first microlens 111 is deflected and irradiated to the second front surface 121a of a corresponding second microlens 121. The second microlens 121 deflects and collimates the light irradiated to the second microlens 121, so that the light emitted through the second rear surface 121b of each second microlens 121 forms a line in the far field. Therefore, Figure 7 A small structural unit of the beam shaping assembly shown can form a small line spot in the far field. Figure 7When the structural units are shown, the small line spots formed by the structural units in the far field can be superimposed in the far field, thereby forming a preset line light spot 4.

[0064] Therefore, the beam shaping component is used to convert the light emitted by the light emitting device 2 into a line light spot 4 in the far field, and when it is used in an optical device, the optical device has a corresponding function. For example, when the optical device is a laser radar transmitter, the optical device cooperates with a scanning device to achieve distance detection in a target area.

[0065] Among them, since the first microlens 111 is used to collimate and deflect light, the optical axis of the first microlens 111 deviates from its geometric center, so that the light emitted from the first microlens 111 is deflected. Similarly, since the second microlens 121 is used to deflect and collimate light, the optical axis of the second microlens 121 deviates from its geometric center, so that the light emitted from the second microlens 121 is deflected.

[0066] In a specific embodiment, Figure 4-6 As shown, the first front surface 111a of the first microlens 111 is a free-form surface, the first rear surface 111b is a plane, and the second front surface 121a and the second rear surface 121b are both free-form surfaces. Figure 1 and Figure 2 When the optical device shown is working, the light emitted by the light emitting device 2 is projected to the second microlens 121 under the action of the first microlens 111, and a row of first microlenses 111 distributed along the second direction Y share one second microlens 121. Under the action of the second microlens 121, the light projected from the first microlens 111 to the second microlens 121 has a coordinate of 0 along the first direction X on the far-field plane, and diffuses along the second direction Y to form a line spot 4. The first front surface 111a is used to control the divergence angle of the line spot 4 of the target far field formed by the light emitted by the light emitting device 2 along the second direction Y, and the second rear surface 121b is used to adjust the line width of the line spot 4 of the target far field along the first direction X.

[0067] Therefore, the free-form surfaces of the first microlens 111 and the second microlens 121 in this embodiment can form a preset line spot 4 in the far field, and the line width and divergence angle of the line spot 4 meet the specific needs of the user.

[0068] The first front surface 111a, the second front surface 121a and the second rear surface 121b are any of a sphere, a parabola and a torus. Of course, the free-form surfaces of the first front surface 111a, the second front surface 121a and the second rear surface 121b in the embodiment of the present application can also be other shapes.

[0069] In a specific embodiment, the first microlens 111 may be an off-axis aspheric lens, and / or the second microlens 121 may also be an off-axis aspheric lens. The aspheric lens has a continuously changing curvature from the center to the periphery of the lens, is not a spherical surface, and has a plane cross section, which can focus the light incident on the aspheric lens to improve aberration. In addition, the optical axis of the off-axis aspheric lens deviates from its geometric center.

[0070] In the above embodiments, Figure 8 and Fig. 9 As shown, Figure 8 is a partial schematic diagram of the beam shaping component in an XY plane in a specific embodiment, Fig. 9 : is a partial schematic diagram of the XZ plane of the beam shaping component in a specific embodiment. The first layer of lenses 11 includes m rows and n columns of first microlenses 111, and the second layer of lenses 12 includes 1 row and n columns of second microlenses 121. In the first layer of lenses 11, the jth lens in the i-th column is ij, and the i-th second microlens 121 in the second layer of lenses 12 is used to shape the light emitted from the i-th column of the first microlens 111, that is, the light emitted from the i-th column of the first microlens 111 can irradiate the i-th second microlens 121.

[0071] The coordinates of the optical axes of the second microlenses 121 along the first direction X are different from each other, and the coordinates of the optical axes of the second microlenses 121 along the second direction Y are the same, that is, Figure 7 The second microlenses 121 of the structural unit shown are coaxial along the second direction Y, so that the small line spots formed by multiple structural units in the far field can be superimposed in the far field to form a preset line light spot 4, avoiding the small line spots being staggered from each other, resulting in a decrease in the quality of the formed line light spot 4 and affecting the accuracy of the optical device.

[0072] It should be noted that, since the second microlens 121 is an off-axis microlens, that is, the optical axis of the second microlens 121 deviates from its geometric center, the fact that the coordinates of the optical axis of the second microlens 121 along the second direction Y are the same does not mean that the coordinates of the geometric center of the second microlens 121 along the second direction Y are the same.

[0073] Specifically, Figure 8 and Fig. 9As shown, ix is ​​the coordinate of the geometric center of the i-th second microlens 121 in the second layer of lenses 12 along the first direction X, iy is the coordinate of the geometric center of the i-th second microlens 121 in the second layer of lenses 12 along the second direction Y, ijx is the coordinate of the geometric center O of the i-th column and j-th first microlens 111 in the first layer of lenses 11 along the first direction X, and ijy is the coordinate of the geometric center O of the i-th column and j-th first microlens 111 in the first layer of lenses 11 along the second direction Y. Since the first microlens 111 is an off-axis lens, the coordinate of the optical axis L of the first microlens 111 along the first direction X is different from the coordinate of its geometric center O along the first direction X, and the two have an offset; the coordinate of the optical axis L of the first microlens 111 along the second direction Y is different from the coordinate of its geometric center O along the second direction Y, and the two have an offset.

[0074] Combination Fig. 9 , ij△x is the offset of the optical axis L of the j-th first microlens 111 in the i-th column in the first layer of lenses 11 relative to its geometric center O in the first direction X, ij△y is the offset of the optical axis L of the j-th first microlens 111 in the i-th column in the first layer of lenses 11 relative to its geometric center O in the second direction Y, and i△y is the offset of the optical axis of the i-th second microlens 121 relative to the optical axis of the i-th column first microlens 111 in the second direction Y.

[0075] according to Fig. 9 From the drawings shown and the projection relationship between the first microlens 111 and the second microlens 121, it can be seen that the first layer of lenses 11 and the second layer of lenses 12 satisfy the following relationship:

[0076]

[0077]

[0078] i Δy =0; (3)

[0079] The focal lengths of the first microlenses 111 are the same and are h1. Along the third direction Z, the distance between the i-th second microlens 121 in the second layer of lenses 12 and the first rear surface 111 b is h2.

[0080] Therefore, for Figure 7 For the structural unit shown, the first microlens 111 and the second microlens 121 must satisfy the above-mentioned constraint relationship, so that the small line spots formed in the far field after being shaped by each structural unit can be superimposed on each other to form the above-mentioned line spot 4.

[0081] In a specific embodiment, according to the diffraction principle, the diffraction limit of the line spot 4 formed by the light emitted from the second microlens 121 in the far field is The aperture of the second microlens 121 is dx, and the divergence angle of the far-field line spot 4 formed by the beam shaping component is θx, which satisfies:

[0082]

[0083] Here, λ is the wavelength of light.

[0084] Therefore, according to the divergence angle θx of the linear light spot 4, the size range of the aperture dx of the second microlens 121 can be obtained, and the larger the aperture of the second microlens 121, the smaller the divergence angle of the linear light spot 4. When it is necessary to form a linear light spot 4 with a smaller divergence angle, the aperture of the second microlens 121 cannot be too small. For example, the divergence angle of the linear light spot 4 can be 0.2°.

[0085] from Figure 3-7 It can be seen that the aperture of the second microlens 121 is larger than the aperture of the first microlens 121 .

[0086] In a specific embodiment, the aperture of the first microlens 111 is less than or equal to 32 μm. The aperture of the first microlens 111 is not too large, so that the volume of the beam shaping component is not too large.

[0087] In the above embodiments, Figure 1 , Figure 2 and Fig.10 As shown, Fig.10 for Figure 1 and Figure 2 Schematic diagram of the structure of the light-emitting device in a specific embodiment. In this embodiment, the light-emitting device 2 may include a plurality of point light sources 21, each of which is distributed in an array along the first direction X and the second direction Y, and the point light sources 21 correspond to the first microlenses 111 one by one. When the optical device is working, the light emitted from each point light source 21 can be incident on the first microlens 111 of the beam shaping component respectively, so that under the shaping effect of the first microlens 111 and the second microlens 121, a line light spot 4 is formed in the far field, that is, the beam shaping component can transform the array-distributed point light of the point light source 21 into a line light spot 4.

[0088] The number of the point light sources 21 is the same as the number of the first micro lenses 111 , and the two correspond one to one. Therefore, one second micro lens 121 corresponds to one column of point light sources 21 .

[0089] Specifically, the light emitting device 2 may be a vertical cavity surface emitting laser (VCSEL), which is a semiconductor whose laser is emitted vertically to the top surface, and is different from an edge-emitting laser generally made of a cut independent chip, where the laser is emitted from the edge. Of course, the light emitting device 2 may also be other light emitting devices, and the present application does not limit the type and structure of the light emitting device.

[0090] In a specific embodiment, a row of point light sources 21 illuminates Figure 7 When a structural unit is formed, a small line spot can be formed in the far field under the shaping effect of the structural unit. When the optical axis of the second microlens 121 and the corresponding column of point light sources 21 have the same coordinates along the first direction X, it is possible to avoid that a plurality of small line spots formed by each structural unit deviate from each other along the first direction X, so that each small line spot can be superimposed along the first direction X in the far field to form a line light spot 4, and the quality of the line light spot 4 is improved.

[0091] Specifically, Fig.10 As shown, along the first direction X, the distance L1 between adjacent point light sources 21 satisfies: 1≤L1≤5mm, and / or, along the second direction Y, the spacing L2 between adjacent point light sources 21 satisfies: 0.02mm≤L2≤0.1mm. For example, L1 can be 1mm, 2mm, 2.5mm, 4mm, 5mm, etc., and L2 can be 0.02mm, 0.05mm, 0.07mm, 0.08mm, 0.1mm, etc.

[0092] like Figure 8 As shown, the distance between the geometric centers of adjacent first microlenses 111 along the first direction X is h3, and the distance between the geometric centers of adjacent first microlenses 111 along the second direction Y is h4. Since the point light source 21 corresponds to the first microlens 111 one by one, h3=L1, h4=L2, therefore, 1≤h3≤5mm, and / or, 0.02mm≤h4≤0.1mm. For example, h3 can be 1mm, 2mm, 2.5mm, 4mm, 5mm, etc., and h4 can be 0.02mm, 0.05mm, 0.07mm, 0.08mm, 0.1mm, etc.

[0093] Among them, the distance h3 between the geometric centers of adjacent first microlenses 111 along the first direction X and the distance L1 between adjacent point light sources 21 along the first direction X are related to the divergence angle of the far-field line spot 4. The larger L1 and h3 are, the smaller the divergence angle of the far-field line spot 4 is. However, when L1 and h3 are too large, the volume of the beam shaping component will be too large. Therefore, the values ​​of L1 and h3 can be selected based on a comprehensive consideration of the divergence angle of the line spot 4 to be formed and the volume of the beam shaping component.

[0094] When the distance h4 between the geometric centers of adjacent first microlenses 111 along the second direction Y and the distance L2 between adjacent point light sources 21 are small, the overall volume of the beam shaping component can be reduced, thereby reducing the volume of the optical device.

[0095] In a specific embodiment, Fig.10 As shown, the wavelength of the light emitted by the array-distributed point light sources 21 may be 940 nm, the divergence angle is ±12°, and the spacing L1 between adjacent point light sources 21 along the first direction X is 1.6 mm, the spacing L2 between adjacent point light sources 21 along the second direction Y is 0.04 mm, and the point light sources 21 in this embodiment are 300×8. The array point light source cooperates with the above-mentioned beam shaping component, and the beam shaping component includes 300×8 first microlenses 111 and 8 second microlenses 121, the spacing h3 between the geometric centers of adjacent first microlenses 111 along the first direction X is 1.6 mm, the spacing h4 between the geometric centers of adjacent first microlenses 111 along the second direction Y is 0.04 mm, and the optical axis of the second microlens 121 and the corresponding column of point light sources 21 along the first direction X have the same coordinates. At the same time, when each of the first microlenses 111 and the second microlenses 121 satisfies the constraints of the above formulas (1), (2), and (3), a line light spot 4 with a divergence angle of 0.2° can be formed in the far field.

[0096] The optical device described in the above embodiments may be a laser radar transmitter, for example, the laser radar transmitter may be used for ranging of a car. In other embodiments, the optical device described in the present application may also be a laser projector.

[0097] In summary, when forming a line light spot in the prior art, the light source is arranged into a line, and then a larger lens is used to shape the light emitted by the light source to form a line light spot. This method causes the lens to be larger in size and weight. In order to solve this technical problem, the light-emitting device provided in the embodiment of the present application forms a line light spot through an array of point light sources and a beam shaping component. The light emitted by the array of point light sources is converted into a far-field line light spot through the beam shaping component. Since the beam shaping component is implemented by the first microlens and the second microlens, the volume and weight of the beam shaping component are relatively small. In addition, the constraint relationship between the first microlens and the second microlens in the embodiment of the present application and the surface shape of the two make the divergence angle of the formed line light spot smaller (for example, less than or equal to 0.2°).

[0098] The above is only a specific implementation of the embodiment of the present application, but the protection scope of the embodiment of the present application is not limited thereto, and any changes or replacements within the technical scope disclosed in the embodiment of the present application should be included in the protection scope of the embodiment of the present application. Therefore, the protection scope of the embodiment of the present application should be based on the protection scope of the claims.

Claims

1. A beam shaping component, characterized in that: The beam shaping assembly includes a first layer of lenses and a second layer of lenses, the first layer of lenses includes a plurality of first micro lenses, each of the first micro lenses is arrayed along a first direction and a second direction, the second layer of lenses includes a plurality of second micro lenses, each of the second micro lenses is arrayed along the first direction, and the first layer of lenses and the second layer of lenses are arrayed along a third direction; The first microlens has a first front surface and a first rear surface along a third direction, the second microlens has a second front surface and a second rear surface along the third direction, the first layer of lenses is used to collimate and deflect the light emitted by the light-emitting device so that the light emitted from the first rear surface can illuminate the second front surface, and the second layer of lenses is used to deflect and collimate the light irradiated to the second front surface so as to form a line spot in the far field.

2. The beam shaping assembly according to claim 1, characterized in that: The optical axis of the first microlens deviates from the geometric center thereof, and the optical axis of the second microlens deviates from the geometric center thereof.

3. The beam shaping assembly according to claim 1, characterized in that: The first front surface is a free-form surface, the first rear surface is a plane, and the second front surface and the second rear surface are both free-form surfaces.

4. The beam shaping assembly according to claim 3, characterized in that: The first front surface, the second front surface and the second rear surface are any one of a spherical surface, a parabolic surface and a toroidal surface.

5. The beam shaping assembly according to claim 1, characterized in that: The first microlens is an off-axis aspheric lens, and the second microlens is a far-field lens.

6. The beam shaping assembly according to any one of claims 1 to 5, characterized in that: The first layer of lenses includes m rows and n columns of first microlenses, the second layer of lenses includes 1 row and n columns of second microlenses, in the first layer of lenses, the jth first microlens in the i-th column is ij, and the i-th second microlens in the second layer of lenses is used to shape the light emitted from the first microlens in the i-th column; The coordinates of the optical axes of the second microlenses along the first direction are different from each other, and the coordinates of the optical axes of the second microlenses along the second direction are the same.

7. The beam shaping assembly according to claim 6, characterized in that: The first layer of lenses and the second layer of lenses satisfy the following relationship: i Δy ＝0； Wherein, ix is ​​the coordinate of the geometric center of the i-th second microlens along the first direction, iy is the coordinate of the geometric center of the i-th second microlens along the second direction, ijx is the coordinate of the geometric center of the j-th first microlens in the i-th column along the first direction, and ijy is the coordinate of the geometric center of the j-th first microlens in the i-th column along the second direction; ij△x is the offset of the optical axis of the jth first microlens in the i-th column relative to its geometric center in the first direction, ij△y is the offset of the optical axis of the jth first microlens in the i-th column relative to its geometric center in the second direction, and i△y is the offset of the optical axis of the i-th second microlens relative to the optical axis of the i-th first microlens in the second direction; The focal lengths of the first microlenses are the same and are h1. Along the third direction, the distance between the i-th second microlens in the second layer of lenses and the first rear surface is h2.

8. The beam shaping assembly according to claim 5, characterized in that: A distance h3 between geometric centers of adjacent first microlenses along a first direction satisfies: 1≤h3≤5mm, and / or a distance h4 between geometric centers of adjacent first microlenses along a second direction satisfies: 0.02mm≤h4≤0.1mm.

9. The beam shaping assembly according to claim 5, characterized in that: The aperture of each of the second microlenses is dx, and the divergence angle of the far-field line spot formed by the beam shaping component is θx, satisfying: Here, λ is the wavelength of light.

10. The beam shaping assembly according to claim 5, characterized in that: The aperture of the first microlens is less than or equal to 32 μm.

11. An optical device, characterized in that: The optical device comprises: case; A light emitting device, wherein the light emitting device is disposed in the housing; A beam shaping assembly, the beam shaping assembly being mounted on the housing; Wherein, the beam shaping component is the beam shaping component according to any one of claims 1-10.

12. The optical device according to claim 11, characterized in that The light emitting device comprises a plurality of point light sources, the plurality of point light sources are distributed in an array along a first direction and a second direction, and the point light sources correspond to the first micro lenses one by one.

13. The optical device according to claim 12, characterized in that The optical axis of the second microlens is the same as the coordinates of a corresponding column of point light sources along the first direction.

14. The optical device according to claim 12, characterized in that Along the first direction, the distance L1 between adjacent point light sources satisfies: 1≤L1≤5mm, and / or, along the second direction, the spacing L2 between adjacent point light sources satisfies: 0.02mm≤L2≤0.1mm.

15. The optical device according to any one of claims 11 to 14, characterized in that: The optical device is a lidar transmitter.

16. The optical device according to any one of claims 11 to 14, characterized in that: The optical device is a laser projector.

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