阅读说明：本技术 具有两个扫描组件的光学装置 (Optical device with two scanning assemblies ) 是由 郑嘉敏 B.P.基沃思 W.金 于 2020-06-30 设计创作，主要内容包括：光学装置可以包括透镜系统。光学装置可以包括第一扫描组件,以接收光束并用光束扫描透镜系统。光学装置可以包括第二扫描组件,以接收来自透镜系统的光束并用光束扫描视场,其中,透镜系统位于第一扫描组件和第二扫描组件之间。透镜系统可以包括扩束器。(The optical means may comprise a lens system. The optical apparatus may include a first scanning assembly to receive the light beam and scan the lens system with the light beam. The optical apparatus may include a second scanning assembly to receive the light beam from the lens system and scan the field of view with the light beam, wherein the lens system is positioned between the first scanning assembly and the second scanning assembly. The lens system may comprise a beam expander.)

1. An optical device, comprising:

a first lens;

a first scanning assembly for receiving a light beam having a first beam size and scanning the first lens with the light beam,

wherein the first lens is to increase a beam size of the light beam to a second beam size,

wherein the second bundle size is greater than the first bundle size;

a second lens for receiving the light beam having the second beam size; and

a second scanning assembly for receiving the light beam having the second beam size from the second lens and scanning a field of view with the light beam having the second beam size; and

wherein the first lens and the second lens are located between the first scanning assembly and the second scanning assembly.

2. The optical apparatus of claim 1, wherein the second lens is to collimate the light beam having the second beam size.

3. The optical apparatus of claim 1, wherein the first lens has a first focal point, and wherein the first scanning component is located at the first focal point.

4. The optical apparatus of claim 1, wherein the second lens has a second focal point, and wherein the second scanning component is located at the second focal point.

5. The optical apparatus of claim 1, wherein a distance between the first lens and the second lens is equal to a sum of a focal length of the first lens and a focal length of the second lens.

6. The optical device of claim 1, further comprising:

a diffractive optical element, wherein a distance between the first lens and the diffractive optical element is equal to a focal length of the first lens.

7. The optical apparatus of claim 1, wherein at least one of the first scanning assembly or the second scanning assembly comprises a biaxial angular scanning assembly.

8. An optical device, comprising:

a first lens;

a first scanning assembly for receiving a light beam and scanning the first lens with the light beam,

wherein the first scanning assembly comprises an angular scanning assembly having a first orientation axis;

a second lens for receiving the light beam; and

a second scanning assembly for receiving the light beam from the second lens,

wherein the second scanning assembly comprises an angular scanning assembly having a second orientation axis, wherein

The second axis is orthogonal to the first axis, an

Wherein the second scanning assembly is for scanning a two-dimensional field of view with the light beam; and

wherein the first lens and the second lens are located between the first scanning assembly and the second scanning assembly.

9. The optical apparatus of claim 8, wherein the first lens has a first focal point and wherein the first scanning assembly is located at the first focal point.

10. The optical apparatus of claim 8, wherein the second lens has a second focal point, and wherein the second scanning component is located at the second focal point.

11. The optical apparatus of claim 8, wherein the first lens is to increase a beam size of the light beam, and wherein the second lens is to collimate the light beam.

12. The optical device of claim 8, further comprising:

at least one of a filter or a diffractive optical element, wherein the at least one of the filter or the diffractive optical element is located between the first lens and the second lens.

13. An optical device, comprising:

a lens system;

a first scanning assembly for receiving a light beam and scanning the lens system with the light beam; and

a second scanning assembly for receiving the light beam from the lens system and scanning a field of view with the light beam,

wherein the lens system is located between the first scanning assembly and the second scanning assembly.

14. The optical apparatus of claim 13, wherein the lens system has a first focal point and a second focal point,

wherein the first focus and the second focus are on opposite sides of the lens system, an

Wherein the first scanning assembly is located at the first focus and the second scanning assembly is located at the second focus.

15. The optical apparatus of claim 13, wherein at least one of the first scanning assembly or the second scanning assembly comprises a single axis angular scanning assembly.

16. The optical apparatus of claim 13, wherein at least one of the first scanning assembly or the second scanning assembly comprises a biaxial angular scanning assembly.

17. The optical apparatus of claim 13, wherein the lens system is configured to increase or decrease the size of the light beam.

18. The optical apparatus of claim 13, wherein at least one of the first scanning assembly or the second scanning assembly is configured to compensate for field distortion of the optical beam.

19. The optical apparatus of claim 13, wherein the lens system is configured to convert an angular shift of the light beam into a spatial shift of the light beam.

20. The optical apparatus of claim 13, wherein the lens system comprises at least one of a filter or a diffractive optical element to modify the light beam based on an angular shift of the light beam.

Technical Field

The present disclosure relates generally to light detection and ranging (lidar) devices and, more particularly, to lidar devices having two scanning assemblies.

Background

The lidar system may generate a light beam (e.g., a laser beam and/or the like), scan the light beam across a field of view that includes one or more objects, receive the reflected beam from the objects in the field of view, process the received beam, and determine a three-dimensional aspect of the one or more objects. For example, based on light reflected from objects in the field of view, the lidar system may construct a point cloud to determine three-dimensional aspects of one or more objects. The lidar system may include a scanner to scan the light beam across the field of view, receive light reflected from the field of view, and provide the light reflected from the field of view to a receiver for processing. Another lidar system may include two scanners cascaded in series so that one scanner may scan a beam onto the other scanner, which may scan the beam across the field of view.

Disclosure of Invention

According to some possible implementations, the optical device may include a first lens; a first scanning assembly for receiving a light beam having a first beam size and scanning a first lens with the light beam, wherein the first lens is for increasing the beam size of the light beam to a second beam size, and wherein the second beam size is larger than the first beam size; a second lens for receiving the light beam having a second beam size; and a second scanning assembly for receiving the light beam having the second beam size from the second lens and scanning the field of view with the light beam having the second beam size; and wherein the first lens and the second lens are located between the first scanning assembly and the second scanning assembly.

Wherein the second lens is for collimating the light beam having the second beam size.

Wherein the first lens has a first focal point, and wherein the first scanning assembly is located at the first focal point.

Wherein the second lens has a second focal point, and wherein the second scanning assembly is located at the second focal point.

Wherein the distance between the first lens and the second lens is equal to the sum of the focal length of the first lens and the focal length of the second lens.

Wherein the optical device further comprises: a diffractive optical element, wherein a distance between the first lens and the diffractive optical element is equal to a focal length of the first lens.

Wherein at least one of the first scanning assembly or the second scanning assembly comprises a dual-axis angular scanning assembly.

According to some possible implementations, the optical device may include a first lens; a first scanning assembly for receiving the light beam and scanning the first lens with the light beam, wherein the first scanning assembly includes an angular scanning assembly having a first orientation axis; the second lens is used for receiving the light beam; and a second scanning assembly for receiving the light beam from the second lens, wherein the second scanning assembly comprises an angular scanning assembly having a second axis of orientation, wherein the second axis is orthogonal to the first axis, and wherein the second scanning assembly is for scanning the two-dimensional field of view with the light beam; and wherein the first lens and the second lens are positioned between the first scanning assembly and the second scanning assembly.

Wherein the first lens has a first focal point and wherein the first scanning assembly is located at the first focal point.

Wherein the second lens has a second focal point, and wherein the second scanning assembly is located at the second focal point.

Wherein the first lens is for increasing the beam size of the light beam and wherein the second lens is for collimating the light beam.

Wherein the optical device further comprises: at least one of a filter or a diffractive optical element, wherein the at least one of a filter or a diffractive optical element is located between the first lens and the second lens.

According to some possible implementations, the optical device may include a lens system; the first scanning assembly is used for receiving the light beam and scanning the lens system by the light beam; and a second scanning assembly for receiving the light beam from the lens system and scanning the field of view with the light beam, wherein the lens system is positioned between the first scanning assembly and the second scanning assembly.

Wherein the lens system has a first focus and a second focus,

wherein the first focus point and the second focus point are on opposite sides of the lens system, and wherein the first scanning assembly is located at the first focus point and the second scanning assembly is located at the second focus point.

Wherein at least one of the first scanning assembly or the second scanning assembly comprises a single axis angular scanning assembly.

Wherein at least one of the first scanning assembly or the second scanning assembly comprises a dual-axis angular scanning assembly.

Wherein the lens system is configured to increase or decrease the size of the light beam.

Wherein at least one of the first scanning assembly or the second scanning assembly is configured to compensate for field distortion of the light beam.

Wherein the lens system is configured to convert the angular shift of the light beam into a spatial shift of the light beam.

Wherein the lens system includes at least one of a filter or a diffractive optical element to modify the light beam based on the angular offset of the light beam.

Drawings

FIG. 1 is a schematic diagram of an example optical device including two scanners.

Fig. 2-4 are schematic diagrams of one or more example optical devices including two scanners and a lens system.

FIG. 5 is a schematic view of an example optical device including a scanner, a lens system, and a window, and an example optical device including a scanner and a window.

Fig. 6A is an exemplary diagram illustrating field distortion (distortion).

Fig. 6B is a schematic diagram of an example adjustment of a scanner to compensate for the field distortion of fig. 6A.

FIG. 7 is a schematic diagram of an example optical device including two scanners and a lens system.

Detailed Description

The following detailed description of example implementations refers to the accompanying drawings. The same reference numbers in different drawings may identify the same or similar elements.

As described above, a lidar system may include a scanner for scanning a light beam across a field of view, receiving the beam reflected from the field of view, and providing the beam reflected from the field of view to a receiver for processing. However, the scanner may be constrained by size constraints (e.g., fit within an optical subassembly, save space in the optical design, and/or the like), tilt range constraints (e.g., avoid contacting other components within the optical subassembly, direct the beam through a window, and/or the like), scan frequency constraints, and/or the like.

As also described above, another lidar system may include two scanners cascaded in series such that one scanner may scan a beam onto the other scanner, which may scan the beam across the field of view. Such a lidar system may overcome some of the constraints discussed above using two scanners. However, in such lidar systems, one scanner must be placed away from the other to leave a gap (clearance) (e.g., to allow the scanner to tilt), and one of the scanners may need to be increased in size to accommodate the beam walk-off. For example, as shown in FIG. 1, the angular tilt of the scanner 1 may produce an angular shift of the laser beam that translates into a spatial shift (e.g., lateral shift) on the scanner 2, and thus the scanner 2 may need to be larger than the scanner 1 so that the laser beam is still reflected onto the scanner 2. However, increasing the size of the scanner may increase the cost of the scanner and consume space in the optical design, optical sub-assembly, and/or the like.

Some implementations described herein provide an optical device that may include a lens system between a first scanner (e.g., a first scanning assembly) and a second scanner (e.g., a second scanning assembly). In some implementations, a first scanner can receive the light beam and scan the lens system with the light beam, and a second scanner can receive the light beam from the lens system and scan the field of view with the light beam. In some implementations, the lens system has a first focus and a second focus, wherein the first focus and the second focus are on opposite sides of the lens system, and wherein the first scanner is located at the first focus and the second scanner is located at the second focus. In some implementations, the first scanner and the second scanner may have similar dimensions. In this manner, the optical arrangement may save cost and space in terms of optical design, optical sub-assemblies, and/or the like that would otherwise be consumed by increasing the size of one of the scanners (e.g., to accommodate beam deviation and/or the like).

In addition, the optical device can keep the beam size small when the laser beam passes from the laser source to the scanner through the optical system. By keeping the beam size small, the optical device may save cost and space in optical design, optical sub-assemblies, and/or the like that would otherwise be consumed by using a larger beam size (which would require a larger optical system). In some implementations, to achieve higher resolution than can be achieved with small beam sizes, the optical device can include a beam expander (beam expander) positioned between the field of view and the scanner that scans the beam across the field of view, wherein the beam expander increases the size of the beam scanned across the field of view.

In some implementations, an optical device including a lens system positioned between the first scanner and the second scanner can include a beam expander in the lens system. For example, instead of placing the beam expander between the field of view and the scanner scanning the beam across the field of view, the beam expander may be placed between the first scanner and the second scanner. By using a beam expander as part of the lens system and for increasing the size of the beam scanned across the field of view, the optical device can save costs that would otherwise be expended by using the lens system and beam expander.

FIG. 2 is a schematic diagram of an example optical device 200 including two scanners and a lens system described herein. As shown in fig. 2, the optical device 200 may include a scanner 1, a scanner 2, and a lens system including a lens 1 and a lens 2. In some implementations, and as shown in fig. 2, the scanner 1 can receive a light beam and scan the lens 1 with the light beam. In some implementations, and as shown in fig. 2, lens 1 and lens 2 may image scanner 1 onto scanner 2. For example, the lens 1 and the lens 2 may receive and refract the light beam such that the scanner 2 may receive the light beam even if the scanner 1 is tilted and produces an angular offset of the light beam (e.g., relative to the optical axis of the optical device). In other words, the lens 1 and the lens 2 can receive and refract the light beams to prevent the angular offset generated by the angular tilt of the scanner 1 from being converted into a spatial offset (e.g., lateral offset) (e.g., offset) on the scanner 2. By preventing the angular offset produced by the angular tilt of the scanner 1 from being converted into a spatial offset on the scanner 2, the lens system can eliminate the need to increase the size of the scanner 2, and can allow the scanner 1 and the scanner 2 to have the same size. In this manner, the lens system may save cost and space in terms of optical design, optical sub-assembly, and/or the like that would otherwise be consumed by increasing the size of the scanner 2 (e.g., to accommodate beam walk-off and/or the like).

In some implementations, the lens system can have a first focal point and a second focal point, where the first focal point and the second focal point are on opposite sides of the lens system. In some implementations, scanner 1 may be located at a first focus and scanner 2 may be located at a second focus. For example, and as shown in FIG. 2, scanner 1 may be located at the focal point of lens 1, and scanner 2 may be located at the focal point of lens 2. In some implementations, the relationship between the focal length f1 of lens 1, the focal length f2 of lens 2, the beam size s1 on scanner 1, the beam size s2 on scanner 2, the angular scan range a1 of scanner 1, and the angular scan range a2 of scanner 2 can be described by the following equation:

in some implementations, if the focal length f1 of lens 1 is equal to the focal length f2 of lens 2, then the lens system obtains on scanner 2 the 1: 1 image.

In some implementations, scanner 1 and/or scanner 2 may include one or more movable mirrors to receive and scan the light beam. For example, scanner 1 and/or scanner 2 may include one or more mirrors that rotate along one or two axes to scan a one-dimensional or two-dimensional light beam, respectively. In some implementations, scanner 1 and/or scanner 2 may include silicon micro-electromechanical systems (MEMS).

In some implementations, scanner 1 and/or scanner 2 may be a single axis angular scanning assembly. For example, as shown in fig. 2, scanner 1 and scanner 2 may be single axis angular scanning components (angular scanning components) having the same axis orientation (e.g., vertical axis, horizontal axis, 45 degree axis, and/or the like). In some implementations, the lens system (e.g., lens 1 and lens 2) may prevent the angular offset produced by the angular tilt of scanner 1 from translating into a spatial offset on scanner 2 and may maintain the angular offset of the laser beam provided by scanner 1. In this way, the optical device 200 can combine the angular offset provided by the scanner 1 and the angular offset provided by the scanner 2 to scan a wider field of view than can be scanned with a single scanner.

Additionally or alternatively, scanner 1 and/or scanner 2 may be a dual axis angular scanning assembly. In some implementations, the scanner 1 and/or the scanner 2 may be tilted angularly in two directions about two axes. In some implementations, the two axes may be orthogonal such that scanner 1 and/or scanner 2 are angularly tilted about a horizontal axis in a vertical direction to provide a vertical angular offset to the light beam and are angularly tilted about a vertical axis in a horizontal direction to provide a horizontal angular offset to the light beam.

For example, scanner 1 may be a single axis angular scanning assembly having a horizontal axis to provide a vertical angular offset, and scanner 2 may be a dual axis angular scanning assembly having a horizontal axis to provide a vertical angular offset and a vertical axis to provide a horizontal angular offset. In this example, the optical device 200 may combine the vertical angular offset provided by the scanner 1 and the vertical angular offset provided by the scanner 2 to scan a field of view that is vertically wider than the field of view that may be scanned with a single scanner. Alternatively, scanner 1 may be a dual axis angular scanning assembly and scanner 2 may be a single axis angular scanning assembly.

In another example, scanner 1 may be a single axis angular scanning assembly having a vertical axis to provide a horizontal angular offset, and scanner 2 may be a dual axis angular scanning assembly having a horizontal axis to provide a vertical angular offset and a vertical axis to provide a horizontal angular offset. In this example, the optical device 200 may combine the horizontal angular offset provided by the scanner 1 and the horizontal angular offset provided by the scanner 2 to scan a field of view that is horizontally wider than the field of view that may be scanned with a single scanner. Alternatively, scanner 1 may be a dual axis angular scanning assembly and scanner 2 may be a single axis angular scanning assembly.

In another example, scanner 1 may be a dual-axis angular scanning assembly having a horizontal axis to provide a vertical angular offset and a vertical axis to provide a horizontal angular offset, and scanner 2 may be a dual-axis angular scanning assembly having a horizontal axis to provide a vertical angular offset and a vertical axis to provide a horizontal angular offset. In this example, the optical device 200 may combine the horizontal angular offset provided by the scanner 1 and the horizontal angular offset provided by the scanner 2, and combine the vertical angular offset provided by the scanner 1 and the vertical angular offset provided by the scanner 2, to scan a field of view that is horizontally and vertically wider than the field of view that may be scanned with a single scanner.

FIG. 3 is a schematic diagram of an example optical device 300 including two scanners and a lens system as described herein. As shown in fig. 3, the optical device 300 may include a scanner 1, a scanner 2, and a lens system including a lens 1 and a lens 2. In some implementations, the scanner 1, scanner 2, lens system, lens 1, and lens 2 of the optical device 300 may be similar to the scanner 1, scanner 2, lens system, lens 1, and lens 2 of the optical device 200 of fig. 2. However, as shown in fig. 3, the scanners 1 and 2 of the optical device 300 may be single-axis angular scanning assemblies having differently oriented axes (e.g., orthogonal axes (e.g., vertical and horizontal axes and/or the like), axes offset by an angle (e.g., 30 degrees, 35 degrees, 45 degrees, and/or the like).

For example, as shown in fig. 3, the scanner 1 may have a horizontal axis about which the scanner 1 is tilted such that the scanner 1 provides the light beam with a vertical angular offset, and the scanner 2 may have a vertical axis about which the scanner 2 is tilted such that the scanner 2 provides the light beam with a horizontal angular offset. In some implementations, the lens system (e.g., lens 1 and lens 2) may prevent the vertical angular offset produced by the angular tilt of scanner 1 from translating into a spatial offset on scanner 2 and may maintain the vertical angular offset of the laser beam provided by scanner 1. In this manner, the optical device 300 may combine the vertical angular offset provided by the scanner 1 and the horizontal angular offset provided by the scanner 2 to scan a field of view in two dimensions (e.g., a two-dimensional field of view). By scanning the field of view in two dimensions using two single axis angular scanning assemblies, the optical device 300 may conserve power resources, financial resources, and/or the like that would otherwise be consumed by scanning the field of view in two dimensions using a dual axis angular scanning assembly.

FIG. 4 is a schematic diagram of an example optical device 400 including two scanners and a lens system as described herein. As shown in fig. 4, the optical device 400 may include a scanner 1, a scanner 2, and a lens system including a lens 1 and a lens 2. In some implementations, the scanner 1, scanner 2, lens system, lens 1, and lens 2 of the optical apparatus 400 may be similar to the scanner 1, scanner 2, lens system, lens 1, and lens 2 of the optical apparatus 200 of fig. 2. In some implementations, the lens system can be configured to increase and/or decrease the size of the light beam.

For example, and as shown in FIG. 4, the lens system may include a beam expander to increase the size of the beam. In some implementations, as shown in fig. 4, the combination of lens 1 and lens 2 may be a beam expander. As shown in fig. 4, the lens 1 may receive a collimated light beam having an initial size from the scanner 1. In some implementations, lens 1 and lens 2 may be positioned such that the distance between lens 1 and lens 2 is equal to the sum of the focal length f1 of lens 1 and the focal length f2 of lens 2. As shown in fig. 4, between the lens 1 and the lens 2, the beam size decreases and then increases to a size larger than the original size. In some implementations, and as shown in fig. 4, the lens 2 may receive a light beam having an increased size, may collimate the light beam, and may provide the collimated light beam having the increased size to the scanner 2. As shown in fig. 4, the scanner 2 may be larger than the scanner 1 so that the scanner 2 may receive a collimated beam having an increased size.

In this way, the optical device 400 can maintain a small beam size when the light beam passes from the light source through the optical system to the scanner 1, and then increase the size of the light beam before scanning the field of view with the light beam using the scanner 2. By keeping the beam size small, the optical device 400 may save cost and space in optical design, optical sub-assemblies, and/or the like that would otherwise be consumed by using larger beam sizes. For example, using a larger beam size may require a larger and/or more expensive light source, larger and/or more expensive optical system components (e.g., lenses, prisms, mirrors (mirrors), and/or the like), larger and/or more expensive scanning components, and/or the like.

Additionally or alternatively, the optical device 400 may achieve higher resolution than can be achieved with a small beam size. For example, an increased beam size may allow the optical device 400 to obtain more information about objects in the field of view than may be obtained with a small beam size. Furthermore, by using a beam expander as part of the lens system, the optical device 400 may save costs that would otherwise be consumed by using the lens system and a separate beam expander.

FIG. 5 is a schematic diagram of an example optical device 500 including a scanner, a lens system, and a window, and an example optical device 510 including a scanner and a window. As shown in fig. 5, the optical device 500 may include a scanner, a lens system including a lens 1 and a lens 2, and a window. In some implementations, the scanner, lens system, lens 1, and lens 2 of optical device 500 may be similar to scanner 1, lens system, lens 1, and lens 2 of optical device 200 of fig. 2.

As shown in fig. 5, the optical device 510 may include a scanner and a window. In some implementations, the scanner of optical device 510 may be similar to scanner 1 and/or scanner 2 of optical device 200 of fig. 2. Additionally or alternatively, the scanner of optical device 510 may be similar to the scanner of optical device 500 (e.g., have the same dimensions, tilt angles, orientation axes (axis), multiple orientation axes (axes), and/or the like). For example, the scanner of optical device 500 and the scanner of optical device 510 may be single axis angular scanning assemblies having a horizontal axis to provide a vertical angular offset.

In some implementations, the window of optical device 500 and the window of optical device 510 may be windows in a housing of a lidar optical subassembly that allow optical components in the lidar optical subassembly (e.g., a scanner, lens 1, lens 2, one or more receivers, and/or the like) to optically communicate with an environment outside the housing. For example, the window may transmit light, be scratch resistant, and protect components of optical device 500 and/or optical device 510. In some implementations, the window can include a glass substrate, a sapphire substrate, and/or the like.

As shown in fig. 5, the window of optical device 500 and the window of optical device 510 may allow the scanner to scan the light beam across fields of view having the same height. As also shown in fig. 5, the window of optical device 500 may be smaller than the window of optical device 510. In some implementations, the window of the optical device 510 may be larger than the scanner to accommodate the vertical angular offset provided to the light beam by the scanner. However, the window of the optical device 500 may have similar dimensions as the scanner, since the lens system (e.g., lens 1 and lens 2) obtains 1: 1 image. For example, if the focal length f1 of lens 1 is equal to the focal length f2 of lens 2, the lens system will obtain 1: 1 image.

In this way, the lens system (e.g., lens 1 and lens 2) may allow optical device 500 to have a smaller window than that of optical device 510, while maintaining the width of the field of view. By reducing the size of the window, the optical device 500 may be less costly (e.g., due to less window material, etc.) and may have a reduced size as compared to the optical device 510.

In some implementations, the optical device 500 can include a lens system configured to increase the size of the light beam. For example, the optical device 500 may include a lens system that includes a beam expander to increase the size of the beam (e.g., before passing through the window) and achieve higher resolution than can be achieved with a small beam size. For example, an increased beam size may allow the optical device 500 to obtain more information about objects in the field of view than may be obtained with a small beam size.

In some implementations, the optical device 500 can include a lens system configured to reduce, reduce (and/or the like) the beam size. For example, the optical device 500 may include a lens system that reduces the size of the light beam (e.g., before passing through the window) and achieves a larger field of view than can be achieved with a large beam size. For example, a reduced beam size may allow the scanner to have a larger tilt angle (e.g., to provide a larger angular offset and/or the like) than is used with a large beam size.

In this manner, a common platform (e.g., including a light source, one or more scanners, lens systems, windows, opto-mechanical stages, and/or the like) may be customized for different application needs with minimal variation. For example, a lens system configured to increase the size of the light beam may be used to achieve some application requirements, while a lens system configured to decrease the size of the light beam may be used to achieve other application requirements.

In some implementations, the scanner can have a resonant frequency (e.g., the scanner can tilt, oscillate, and/or the like), wherein the optical arrangement of the scanner with the higher resonant frequency can have improved performance compared to the optical arrangement of the scanner with the lower resonant frequency. In some implementations, the resonant frequency of the scanner can depend on the size and tilt angle of the scan mirror. For example, a larger scan mirror size can have a lower resonant frequency than the resonant frequency of a smaller scan mirror size. Additionally or alternatively, a larger tilt angle may have a lower resonant frequency than a resonant frequency of a smaller tilt angle.

As described herein, an optical device may include a lens system configured to increase and/or decrease the size of a light beam. In some implementations, the increase and/or decrease can be described as a beam expansion ratio (e.g., in the case of an increase in beam size) or a beam reduction ratio (e.g., in the case of a decrease in beam size). In some implementations, the optical device can include a scanner and a lens system, and the tilt angle and the size of the scanning mirror can be balanced using a beam expansion ratio or a beam reduction ratio of the lens system while maintaining a resonant frequency of the scanner.

For example, the lens system may have a beam expansion ratio of 2 (e.g., the beam is twice as large after passing through the lens system and/or the like), and the scanner may have a tilt angle that is reduced by half based on the beam expansion ratio, and may also have a scan mirror size that is reduced by half based on the beam expansion ratio. In such examples, the scanner may have an increased resonant frequency due to the reduced tilt angle and reduced scan mirror size, which may improve performance of the optical device. Additionally or alternatively, although a reduced tilt angle may result in reduced performance of the optical device, a reduced scan mirror size may result in a performance improvement greater than the performance reduction resulting from a reduced tilt angle.

Fig. 6A is a diagram illustrating an example graph 610 of field distortion. In some implementations, a field distortion may be generated by a combination of optical components (e.g., a scanner, a lens system, and/or the like) and/or optical components within an optical device (e.g., optical device 100, optical device 200, optical device 300, optical device 400, optical device 500, optical device 510, and/or the like), one or more scan lines of which may not be linear, as shown in fig. 6A. For example, as shown in diagram 610 of FIG. 6A, the scan line of the optical device may be curved.

Fig. 6B is a diagram of an example adjustment 620 to a scanner to compensate for field distortion in the optical device of fig. 6A. In some implementations, the scanner of fig. 6B can be a dual-axis angular scanning assembly having a y-axis (e.g., a horizontal axis) to provide a vertical angular offset and an x-axis (e.g., a vertical axis) to provide a horizontal angle. In some implementations, the optical device can adjust the tilt angle of the scanner in the y-axis and/or adjust the tilt angle of the scanner in the x-axis to compensate for field distortion and/or implement a linear scan line.

For example, and as shown in fig. 6B, the optical device may adjust the tilt angle of the scanner by 5 degrees in the y-axis and 12.5 degrees in the x-axis. In this way, the optical device can adjust the angle at which an incident beam (e.g., as shown by incident (I)) is reflected by the scanner as an emergent beam (e.g., as shown by emergent (O)) to compensate for field distortion and/or achieve a linear scan line.

In some implementations, the optical device can include a first scanner and a second scanner, where the first scanner and the second scanner are dual-axis angular scanning assemblies. In some implementations, the first scanner and/or the second scanner can be configured to compensate for field distortion of the light beam. In some implementations, the optical arrangement can adjust the first scanner and/or the second scanner to compensate for field distortion. For example, the optical arrangement may adjust the first scanner to compensate for field distortion caused by optical components located between the beam source and the first scanner, and may adjust the second scanner to compensate for field distortion caused by optical components located between the first scanner and the second scanner.

Fig. 7 is a schematic diagram of an example optical device 700 that includes two scanners and a lens system. As shown in fig. 7, the optical device 700 may include a scanner 1, a scanner 2, and a lens system including a lens 1 and a lens 2, and a filter and/or a Diffractive Optical Element (DOE). In some implementations, the scanner 1, scanner 2, lens system, lens 1, and lens 2 of the optical device 700 may be similar to the scanner 1, scanner 2, lens system, lens 1, and lens 2 of the optical device 200 of fig. 2.

In some implementations, the lens system may include a filter and/or a DOE in a position where the size of the beam is small relative to the filter and/or DOE. For example, and as shown in fig. 7, a filter and/or DOE may be located between lens 1 and lens 2. In some implementations, the filter and/or DOE may be located at a position corresponding to the focal point of lens 1 and the focal point of lens 2.

In some implementations, the lens system may include filters and/or DOEs to provide angle-dependent correction of the beam, to convert angular shifts of the beam into spatial shifts of the beam, and/or the like. For example, the filters and/or DOEs may compensate and/or correct for field distortions caused by optical components (e.g., scanner 1, scanner 2, lens system, lens 1, lens 2, other lenses, other mirrors, and/or the like) and/or combinations of optical components in the optical device 700. By positioning the filter and/or DOE at a location where the size of the beam is small relative to the filter and/or DOE, the optical device 700 may improve the performance of the filter and/or DOE while providing angle-dependent correction to the beam, field distortion compensation and/or correction to the beam, and/or the like.

As described above, fig. 1-5, 6A-6B, and 7 are provided merely as one or more examples. Other examples may be different from that described with reference to fig. 1-5, 6A-6B, and 7.

The number and arrangement of components shown in fig. 1-5, 6A-6B, and 7 are provided as one or more examples. Indeed, there may be additional components, fewer components, different components, or differently arranged components than those shown in fig. 1-5, 6A-6B, and 7. Furthermore, two or more of the components shown in fig. 1-5, 6A-6B, and 7 may be implemented within a single component, or a single component shown in fig. 1-5, 6A-6B, and 7 may be implemented as multiple distributed components. Additionally or alternatively, one set of components (e.g., one or more components) of optical device 100, optical device 200, optical device 300, optical device 400, optical device 500, optical device 510, and optical device 700 may perform one or more functions described as being performed by another set of components.

The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the implementations to the precise form disclosed. Modifications and variations are possible in light of the above disclosure or may be acquired from practice of the implementations.

As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, and/or a combination of hardware and software.

Even though particular combinations of features are set forth in the claims and/or disclosed in the specification, these combinations are not intended to limit the disclosure of the various implementations. In fact, many of these features may be combined in ways not specifically recited in the claims and/or disclosed in the specification. Although each dependent claim listed below may depend directly on only one claim, the disclosure of various implementations includes each dependent claim in combination with every other claim in the claim set.

No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Also, as used herein, the articles "a" and "an" are intended to include one or more items, and may be used interchangeably with "one or more". In addition, as used herein, the article "the" is intended to include the item or items referred to by the conjoined article "the" and may be used interchangeably with "one or more". Further, as used herein, the term "collection" is intended to include one or more items (e.g., related items, unrelated items, combinations of related and unrelated items, etc.) and may be used interchangeably with "one or more". Where only one item is intended, the phrase "only one item" or similar language is used. Also, as used herein, the terms "having", "having" and/or the like are intended to be open-ended terms. Further, the phrase "based on" is intended to mean "based, at least in part, on" unless explicitly stated otherwise. In addition, as used herein, the term "or" when used in tandem is intended to be inclusive and may be used interchangeably with "and/or" unless specifically stated otherwise (e.g., if used in conjunction with "or (eiter)" or "just one of it").