Optical lenses and lidar

Abstract

This application provides an optical lens and a lidar, relating to the field of radar technology. The optical lens provided in this application, by placing a first lens group with positive optical power near the object side and a second lens group with negative optical power near the image side, and by rationally setting the positive and negative optical power relationships of each lens, allows the optical lens to have a long focal length while maintaining a short lens length. Therefore, when applied to lidar, this optical lens enables the lidar to have better resolution, improves detection and safety performance, and facilitates device miniaturization.

Description

Technical Field

[0001] This application relates to the field of radar technology, and more specifically, to an optical lens and a lidar. Background Technology

[0002] With the increasing prevalence of autonomous driving technology, the demands on LiDAR (Light Detection and Ranging) are also rising. According to the requirements of autonomous driving, the higher the resolution of the LiDAR, the stronger its ability to distinguish objects. Increasing the focal length of the lens can improve the resolution of the LiDAR. However, increasing the focal length also increases the overall length of the lens, thus increasing the overall size of the LiDAR unit. Therefore, existing LiDAR receiving lenses cannot meet the requirement of increasing the focal length while maintaining a small size. Summary of the Invention

[0003] The purpose of this application includes providing an optical lens and a lidar that can achieve both high resolution and small size.

[0004] The embodiments of this application can be implemented as follows:

[0005] In a first aspect, this application provides an optical lens, including a first lens group and a second lens group arranged sequentially from the object side to the image side along the optical axis extension direction, wherein the first lens group has positive optical power and the second lens group has negative optical power.

[0006] The first lens group comprises lenses arranged sequentially from the object side to the image side along the optical axis:

[0007] The first lens has positive optical power;

[0008] The second lens has positive optical power;

[0009] The third lens has negative optical power; and

[0010] The fourth lens has positive optical power;

[0011] The second lens group comprises lenses arranged sequentially from the object side to the image side along the optical axis:

[0012] The fifth lens has negative optical power;

[0013] The sixth lens has negative optical power; and

[0014] The seventh lens has negative optical power.

[0015] In this embodiment, by placing the first lens group with positive optical power closer to the object side and the second lens group with negative optical power closer to the image side, and by rationally setting the positive and negative optical power relationships of each lens, the optical lens achieves a relatively long focal length while maintaining a short lens length. Therefore, when applied to lidar, this optical lens enables the lidar to have better resolution, improves detection and safety performance, and facilitates device miniaturization. The first, second, and fourth lenses with positive optical power have a converging effect, collecting the maximum field of view of light into the rear optical system and fixing the direction of edge light rays; the third, fifth, sixth, and seventh lenses with negative optical power have a certain degree of diverging effect, facilitating a smooth transition of light into the rear optical system.

[0016] In an optional embodiment, the object-side surface of the first lens is convex, the image-side surface of the first lens is concave, or both the object-side surface and the image-side surface of the first lens are convex.

[0017] And / or, the object-side surface of the second lens is convex, the image-side surface of the second lens is concave, or both the object-side surface and the image-side surface of the second lens are convex.

[0018] And / or, the object-side surface of the third lens is convex, the image-side surface of the third lens is concave, or both the object-side surface and the image-side surface of the third lens are concave.

[0019] And / or, the object-side surface of the fourth lens is convex, the image-side surface of the fourth lens is concave, or both the object-side surface and the image-side surface of the fourth lens are convex.

[0020] And / or, the object-side surface of the fifth lens is convex, the image-side surface of the fifth lens is concave, or both the object-side surface and the image-side surface of the fifth lens are concave.

[0021] And / or, the object-side surface of the sixth lens is convex, the image-side surface of the sixth lens is concave, or both the object-side surface and the image-side surface of the sixth lens are concave.

[0022] And / or, the object-side surface of the seventh lens is convex, and the image-side surface of the seventh lens is concave.

[0023] When the object-side surface of the first, second, and fourth lenses is convex and the image-side surface is concave, the lenses are easy to manufacture and have good manufacturability. When both the object-side and image-side surfaces of the first, second, and fourth lenses are convex, the lens shape is gentle, allowing diverging light rays to enter smoothly and further smoothing the light path transition. When the object-side surface of the third, fifth, and sixth lenses is convex and the image-side surface is concave, the lenses are easy to manufacture and have good manufacturability. When both the object-side and image-side surfaces of the third, fifth, and sixth lenses are concave, it helps to smooth the path of incoming light rays, which is beneficial for image resolution. The seventh lens has a convex object-side surface and a concave image-side surface, which is beneficial for increasing the central back focal length, increasing the focusing space for assembly of the optical lens and sensor, and facilitating assembly; furthermore, convex and concave lenses are easy to manufacture and have good manufacturability.

[0024] In an optional implementation, the seventh lens has negative optical power in the meridional direction and no optical power in the sagittal direction, with the meridional, sagittal, and optical axis extension directions being perpendicular to each other. By giving the seventh lens different optical powers in the meridional and sagittal directions, the entire optical lens achieves different optical powers in these two directions, better adapting to sensors of specific shapes and sizes, such as rectangular sensors.

[0025] In an optional implementation, the seventh lens is a cylindrical lens.

[0026] The seventh lens is a cylindrical lens, which allows adjustment of the focal length in the meridional and sagittal directions to achieve different values, thereby regulating the light path in the meridional and sagittal directions and focusing the incident light onto a sensor of a specific size. Furthermore, cylindrical lenses have lower manufacturing costs.

[0027] In an optional implementation, the focal length of the optical lens in the meridional direction is 270–280 mm, and the focal length in the sagittal direction is 210–225 mm. By setting appropriate focal lengths in the meridional and sagittal directions, sensors of specific shapes and sizes can be adapted, improving the detection effect of lidar while also having the advantage of miniaturization.

[0028] In an optional embodiment, the focal length of the first lens group is 45–55 mm, the focal length of the second lens group in the meridional direction is -3.7–-2.1 mm, and the focal length of the second lens group in the sagittal direction is -5.7–-3.6 mm. By setting the first and second lens groups to have reasonable focal lengths, the focal length of the optical lens is within an optimal range, which is beneficial to improving image quality, while the optical lens has a small size.

[0029] In an optional embodiment, the focal length of the first lens is 140–166 mm;

[0030] And / or, the focal length of the second lens is 65–77 mm;

[0031] And / or, the focal length of the third lens is -81 to -72 mm;

[0032] And / or, the focal length of the fourth lens is 46–79 mm;

[0033] And / or, the focal length of the fifth lens is -53 to -34 mm;

[0034] And / or, the focal length of the sixth lens is -9 to -5 mm;

[0035] And / or, the focal length of the seventh lens in the meridional direction is -32 to -15 mm.

[0036] By setting each lens to have a reasonable focal length, the focal length of the optical lens is kept within an optimal range, which helps to improve image quality, while the optical lens has a small size.

[0037] In an optional implementation, the total optical length (TTL) of the optical lens satisfies 80mm ≤ TTL ≤ 95mm. Setting the total optical length of the optical lens within a reasonable range is beneficial for device miniaturization while maintaining image quality.

[0038] In an optional implementation, the distance d45 between the fourth lens and the fifth lens on the optical axis satisfies the relationship: 0.1≤d45 / TTL≤0.2;

[0039] The distance d56 between the fifth and sixth lenses on the optical axis satisfies the following relationship: 0.1≤d56 / TTL≤0.2.

[0040] By controlling the center distance between the fourth and fifth lenses and the center distance between the fifth and sixth lenses to satisfy the above conditions, it is beneficial to ensure a smooth transition of light and improve image quality. It is also beneficial to control the total length of the optical lens.

[0041] In an optional embodiment, the refractive index of the first lens is not less than 1.7. Using a high refractive index material for the first lens is beneficial for reducing the front aperture and improving image quality.

[0042] In an optional implementation, the Abbe number Vd2 of the second lens and the Abbe number Vd1 of the first lens satisfy the relationship: 25≤Vd2-Vd1≤30.

[0043] In an optional implementation, the Abbe number Vd2 of the second lens and the Abbe number Vd3 of the third lens satisfy the relationship: 45≤Vd2-Vd3≤60.

[0044] In an optional implementation, the Abbe number Vd2 of the second lens and the Abbe number Vd4 of the fourth lens satisfy the relationship: 15≤Vd2-Vd4≤30.

[0045] In an optional implementation, the Abbe number Vd2 of the second lens and the Abbe number Vd5 of the fifth lens satisfy the relationship: 40≤Vd2-Vd4≤50.

[0046] By rationally allocating the Abbe numbers of the first, second, fourth, and fifth lenses to satisfy the above-mentioned relationship, it is beneficial to correct the chromatic aberration caused by the laser temperature drift of the lidar.

[0047] In an optional implementation, the optical lens satisfies the relationship: 15 ≤ D / H / FOV ≤ 25, where D is the maximum optical aperture of the incident first lens, FOV is the lens field of view, and H is the image height corresponding to the maximum field of view. By ensuring that the optical lens satisfies the above relationship, it is beneficial to achieve miniaturization while maintaining the effective light-transmitting aperture of the optical lens.

[0048] In an optional embodiment, the absolute values ​​of the refractive index temperature coefficients of the second and fourth lenses are not less than 7 × 10⁻⁶. -6 / ℃. The refractive index of a material is temperature-dependent, and the temperature coefficient of refractive index (TCI) is an indicator that measures the degree of change in the refractive index of a material caused by a unit temperature. By selecting materials with large absolute values ​​of TCI for the second and fourth lenses, the sensitivity of the optical lens to temperature changes can be significantly reduced, thereby allowing the optical lens to maintain a stable focal length over a wider temperature range and enhancing its temperature adaptability.

[0049] In an optional embodiment, the optical lens further includes a filter and a protective glass. The protective glass is disposed on the image side of the seventh lens, and the filter is disposed between the protective glass and the seventh lens. The filter can filter the light passing through it, allowing only light within a narrow wavelength range to pass through, thereby reducing the impact of ambient light on the lidar and improving the signal-to-noise ratio. The protective glass can prevent foreign objects from entering the interior of the optical lens and affecting its operation; it can also protect the photosensitive surface of the sensor from dust and dirt contamination, preventing the reduction of radar detection capability due to photosensitive surface contamination.

[0050] In an optional embodiment, the optical lens further includes a first lens barrel and a second lens barrel. A first lens group is disposed within the first lens barrel, and a second lens group is disposed within the second lens barrel. The first and second lens barrels are axially connected by threads and / or adhesive. Before assembly, the first and second lens barrels are two separate parts, each carrying one of the first and second lens groups respectively. During assembly, the second lens group can be actively adjusted. During this process, the camera is placed at the image plane, and the axial distance between the second lens group and the first lens group is adjusted back and forth (or by rotating the second lens barrel if a threaded connection is used). The change in the size of the image spot is observed, and the point where the image spot at the image plane is smallest indicates that the appropriate adjustment position has been reached. Then, the relative positions of the first and second lens barrels are fixed, and the assembly is complete. By making the first and second lens barrels independent before assembly, the assembly efficiency and yield of the optical lens are improved.

[0051] Secondly, this application provides a lidar, including the optical lens described in any of the embodiments of the first aspect. Attached Figure Description

[0052] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 This is a schematic diagram of the optical lens in the sagittal direction view in the first embodiment of this application;

[0054] Figure 2 This is a schematic diagram of the optical lens in the first embodiment of this application from a meridional perspective.

[0055] Figure 3 This is a schematic diagram of the optical lens in the sagittal direction in the second embodiment of this application;

[0056] Figure 4 This is a schematic diagram of the optical lens in the meridional direction in the second embodiment of this application;

[0057] Figure 5 This is a schematic diagram of the optical lens in the sagittal direction in the third embodiment of this application;

[0058] Figure 6 This is a schematic diagram of the optical lens in the meridional direction in the third embodiment of this application;

[0059] Figure 7 This is a schematic diagram of the optical lens in the sagittal direction in the fourth embodiment of this application;

[0060] Figure 8 This is a schematic diagram of the optical lens in the meridional direction in the fourth embodiment of this application;

[0061] Figure 9 This is a schematic diagram of the assembly of an optical lens in one embodiment of this application;

[0062] Figure 10 This is a schematic diagram of the assembly of the optical lens in another embodiment of this application.

[0063] Icons: 010 - Optical lens; 011 - First lens barrel; 012 - Second lens barrel; 100 - First lens; 200 - Second lens; 300 - Third lens; 400 - Fourth lens; 500 - Fifth lens; 600 - Sixth lens; 700 - Seventh lens; 800 - Filter; 900 - Protective glass. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0065] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0066] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0067] In the description of this application, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0068] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0069] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0070] Figure 1 This is a schematic diagram of the optical lens 010 in the first embodiment of this application from the perspective of the sagittal direction. Figure 2 This is a schematic diagram of the optical lens 010 in the first embodiment of this application under a meridional viewing angle. Figure 1 and Figure 2 As shown, the optical lens 010 provided in this embodiment includes a first lens group and a second lens group arranged sequentially from the object side to the image side along the optical axis. Figure 1 and Figure 2 In this configuration, the optical axis extends in a left-right direction, with the left side being the object side and the right side the image side. The first lens group has positive optical power, and the second lens group has negative optical power.

[0071] The first lens group includes a first lens 100, a second lens 200, a third lens 300, and a fourth lens 400 arranged sequentially from the object side to the image side along the optical axis. The first lens 100 has positive optical power, the second lens 200 has positive optical power, the third lens 300 has negative optical power, and the fourth lens 400 has positive optical power.

[0072] The second lens group includes a fifth lens 500, a sixth lens 600, and a seventh lens 700 arranged sequentially from the object side to the image side along the optical axis. The fifth lens 500, the sixth lens 600, and the seventh lens 700 all have negative optical power.

[0073] Furthermore, the optical lens 010 also includes a filter 800 and a protective glass 900. The protective glass 900 is disposed on the image side of the seventh lens 700, and the filter 800 is disposed between the protective glass 900 and the seventh lens 700. The filter 800 can filter the light passing through it, allowing only light within a narrow wavelength range to pass through, thereby reducing the impact of ambient light on the lidar and improving the signal-to-noise ratio. The protective glass 900 can prevent foreign objects from entering the interior of the optical lens 010 and affecting its operation; it can also protect the photosensitive surface of the sensor from dust and dirt contamination, preventing the reduction of radar detection capability due to dirt on the photosensitive surface.

[0074] In this embodiment, the light beam can enter the optical lens 010 from the object side, pass through each lens, filter 800 and protective glass 900 in sequence, and then form an image at the image plane IMA (image).

[0075] In this embodiment, by placing the first lens group with positive optical power closer to the object side and the second lens group with negative optical power closer to the image side, and by rationally setting the positive and negative optical power relationships of each lens, the optical lens 010 can achieve a long focal length while maintaining a short lens length. Therefore, when applied to lidar, the optical lens 010 can enable the lidar to have better resolution, improve detection performance and safety performance, and facilitate device miniaturization. The first lens 100, second lens 200, and fourth lens 400 with positive optical power have a converging effect, which can collect the maximum field of view of light into the rear optical system and fix the direction of edge light rays; the third lens 300, fifth lens 500, sixth lens 600, and seventh lens 700 with negative optical power play a certain degree of diverging effect, which is conducive to the smooth transition of light into the rear optical system.

[0076] Optionally, the object-side surface of the first lens 100 is convex, and the image-side surface of the first lens 100 is concave; or, both the object-side surface and the image-side surface of the first lens 100 are convex.

[0077] And / or, the object-side surface of the second lens 200 is convex, the image-side surface of the second lens 200 is concave, or both the object-side surface and the image-side surface of the second lens 200 are convex.

[0078] And / or, the object-side surface of the third lens 300 is convex, the image-side surface of the third lens 300 is concave, or both the object-side surface and the image-side surface of the third lens 300 are concave.

[0079] And / or, the object-side surface of the fourth lens 400 is convex, the image-side surface of the fourth lens 400 is concave, or both the object-side surface and the image-side surface of the fourth lens 400 are convex.

[0080] And / or, the object-side surface of the fifth lens 500 is convex, the image-side surface of the fifth lens 500 is concave, or both the object-side surface and the image-side surface of the fifth lens 500 are concave.

[0081] And / or, the object-side surface of the sixth lens 600 is convex, the image-side surface of the sixth lens 600 is concave, or both the object-side surface and the image-side surface of the sixth lens 600 are concave.

[0082] And / or, the object-side surface of the seventh lens 700 is convex, and the image-side surface of the seventh lens 700 is concave.

[0083] When the object-side surfaces of the first lens 100, the second lens 200, and the fourth lens 400 are convex and the image-side surfaces are concave, the lenses are easy to manufacture and have good manufacturability. When both the object-side and image-side surfaces of the first lens 100, the second lens 200, and the fourth lens 400 are convex, the lens shape is gentle, allowing diverging light rays to smoothly enter the rear and further smoothing the light path transition. When the object-side surfaces of the third lens 300, the fifth lens 500, and the sixth lens 600 are convex and the image-side surfaces are concave, the lenses are easy to manufacture and have good manufacturability. When both the object-side and image-side surfaces of the third lens 300, the fifth lens 500, and the sixth lens 600 are concave, it is beneficial to smooth the path of incoming light rays and improve image resolution. The object-side surface of the seventh lens 700 is convex and the image-side surface is concave, which is beneficial to increasing the central back focal length, increasing the focusing space for the optical lens 010 and the sensor, and facilitating assembly; furthermore, convex and concave lenses are easy to manufacture and have good manufacturability.

[0084] exist Figure 1 , Figure 2 In the first embodiment shown, the object-side surfaces of the first lens 100, the second lens 200, the third lens 300, the fourth lens 400, the fifth lens 500, and the seventh lens 700 are all convex, and the image-side surfaces are all concave; the object-side surface and the image-side surface of the sixth lens 600 are both concave.

[0085] Optionally, the seventh lens 700 has negative optical power in the meridional direction and no optical power in the sagittal direction; the meridional direction, the sagittal direction, and the extension direction of the optical axis are perpendicular to each other. Figure 1 In the diagram, the meridian direction is the vertical direction, and the sagittal direction is the visual direction; Figure 2 In this context, the meridional direction is the viewing angle direction, and the sagittal direction is the vertical direction. By giving the seventh lens 700 different optical powers in the meridional and sagittal directions, the entire optical lens 010 achieves different optical powers in these directions, allowing for better adaptation to sensors of specific shapes and sizes, such as rectangular sensors. Optionally, the seventh lens 700 can be a cylindrical lens, with no curvature on its object-side and image-side surfaces in the sagittal direction. Cylindrical lenses offer the advantage of lower manufacturing costs.

[0086] In this embodiment, the focal length of the optical lens 010 in the meridional direction can be selected as 270-280mm, and the focal length of the optical lens 010 in the sagittal direction can be selected as 210-225mm. By setting reasonable focal lengths in the meridional and sagittal directions, sensors of specific shapes and sizes can be adapted, improving the detection effect of lidar, while also having the advantage of miniaturization.

[0087] Optionally, the focal length of the first lens group is 45–55 mm, the focal length of the second lens group is -3.7–-2.1 mm in the meridional direction, and the focal length of the second lens group is -5.7–-3.6 mm in the sagittal direction. By setting the first and second lens groups to have reasonable focal lengths, the focal length of the optical lens 010 is within an optimal range, which is beneficial to improving image quality, while the optical lens 010 has a small size.

[0088] In optional embodiments, the focal length of the first lens 100 is 140–166 mm; and / or, the focal length of the second lens 200 is 65–77 mm; and / or, the focal length of the third lens 300 is -81–-72 mm; and / or, the focal length of the fourth lens 400 is 46–79 mm; and / or, the focal length of the fifth lens 500 is -53–-34 mm; and / or, the focal length of the sixth lens 600 is -9–-5 mm; and / or, the focal length of the seventh lens 700 in the meridional direction is -32–-15 mm. By setting each lens to have a reasonable focal length, the focal length of the optical lens 010 is within an optimal range, which is beneficial to improving image quality, while the optical lens 010 has a small size.

[0089] Optionally, the total optical length (TTL) of the optical lens 010 satisfies 80mm ≤ TTL ≤ 95mm. Setting the total optical length of the optical lens 010 within a reasonable range is beneficial for device miniaturization while maintaining image quality.

[0090] Optionally, the distance d45 between the fourth lens 400 and the fifth lens 500 on the optical axis satisfies the relationship: 0.1 ≤ d45 / TTL ≤ 0.2; the distance d56 between the fifth lens 500 and the sixth lens 600 on the optical axis satisfies the relationship: 0.1 ≤ d56 / TTL ≤ 0.2. By controlling the center distance between the fourth lens 400 and the fifth lens 500, and the center distance between the fifth lens 500 and the sixth lens 600, to satisfy the above conditions, it is beneficial to ensure smooth light transition, improve image quality, and also facilitate the control of the total length of the optical lens 010.

[0091] Optionally, the refractive index of the first lens 100 is not less than 1.7. Using a high refractive index material for the first lens 100 is beneficial for reducing the front aperture and improving image quality.

[0092] Optionally, the Abbe number Vd2 of the second lens 200 and the Abbe number Vd1 of the first lens 100 satisfy the following relationship: 25 ≤ Vd2 - Vd1 ≤ 30. Optionally, the Abbe number Vd2 of the second lens 200 and the Abbe number Vd3 of the third lens 300 satisfy the following relationship: 45 ≤ Vd2 - Vd3 ≤ 60. Optionally, the Abbe number Vd2 of the second lens 200 and the Abbe number Vd4 of the fourth lens 400 satisfy the following relationship: 15 ≤ Vd2 - Vd4 ≤ 30. Optionally, the Abbe number Vd2 of the second lens 200 and the Abbe number Vd5 of the fifth lens 500 satisfy the following relationship: 40 ≤ Vd2 - Vd4 ≤ 50. Temperature changes affect the wavelength of the probe light generated by the laser, and wavelength changes directly affect chromatic aberration. The Abbe number is an indicator characterizing the degree of dispersion of a medium; the higher the Abbe number, the lower the degree of dispersion. By rationally allocating the Abbe numbers of the first lens 100, the second lens 200, the fourth lens 400, and the fifth lens 500 to satisfy the above-mentioned relationship, it is beneficial to correct the chromatic aberration caused by the laser temperature drift of the lidar.

[0093] Optionally, the optical lens 010 satisfies the relationship: 15 ≤ D / H / FOV ≤ 25, where D is the maximum optical diameter of the incident first lens 100, FOV is the lens field of view, and H is the image height corresponding to the maximum field of view. By making the optical lens 010 satisfy the above relationship, it is beneficial to achieve miniaturization while ensuring the effective light transmission diameter of the optical lens 010.

[0094] Optionally, the absolute values ​​of the refractive index temperature coefficients of the second lens 200 and the fourth lens 400 are not less than 7 × 10⁻⁶. -6 / ℃. The refractive index of a material is temperature-dependent, and the temperature coefficient of refractive index (TCI) is an indicator that measures the degree of change in the refractive index of a material caused by a unit temperature. By selecting materials with large absolute values ​​of TCI for the second lens 200 and the fourth lens 400, the absolute values ​​of the TCI for the first lens 100, the third lens 300, the fifth lens 500, the sixth lens 600, and the seventh lens 700 are relatively low (not greater than 2.5). This effectively reduces the sensitivity of the optical lens 010 to temperature changes, thereby allowing the optical lens 010 to maintain a stable focal length over a wider temperature range and enhancing its temperature adaptability.

[0095] The following table is Figure 1 , Figure 2 The specific parameters of the optical lens 010 of the first embodiment shown.

[0096]

[0097]

[0098] The table below shows the curvature, thickness, spacing, refractive index, and Abbe number of each lens in the optical lens 010 in the first embodiment.

[0099]

[0100] It should be understood that a positive radius of curvature indicates that the center of curvature is located on the image side of the surface, while a negative radius of curvature indicates that the center of curvature is located on the object side of the surface. The thickness / distance corresponding to odd-numbered surface numbers is the thickness of the component containing that surface at the optical axis position, while the thickness / distance corresponding to even-numbered surface numbers is the distance (air thickness) between the component containing that surface and the next component on the image side at the optical axis position.

[0101] Figure 3 This is a schematic diagram of the optical lens 010 in the second embodiment of this application from the perspective of the sagittal direction; Figure 4 This is a schematic diagram of the optical lens 010 in the second embodiment of this application under a meridional viewing angle. Figure 3 and Figure 4 As shown, compared with the first embodiment, the shapes and parameters of the first lens group and the second lens group in the second embodiment are different.

[0102] exist Figure 3 and Figure 4 In the second embodiment shown, the object-side surface and image-side surface of the first lens 100 are both convex surfaces; the object-side surface of the second lens 200, the third lens 300, the fourth lens 400, the fifth lens 500, and the seventh lens 700 are all convex surfaces, and the image-side surface of the sixth lens 600 is all concave surfaces; the object-side surface and image-side surface of the sixth lens 600 are both concave surfaces.

[0103] The following table is Figure 3 , Figure 4 The specific parameters of the optical lens 010 of the second embodiment shown.

[0104]

[0105]

[0106] The table below shows the curvature, thickness, spacing, refractive index, and Abbe number of each lens in the optical lens 010 in the second embodiment.

[0107]

[0108] Figure 5 This is a schematic diagram of the optical lens 010 in the third embodiment of this application from the perspective of the sagittal direction; Figure 6 This is a schematic diagram of the optical lens 010 in the third embodiment of this application under a meridional viewing angle. Figure 5 and Figure 6As shown, compared with the first embodiment, the shapes and parameters of the first lens group and the second lens group in the third embodiment are different.

[0109] exist Figure 5 and Figure 6 In the third embodiment shown, the object-side and image-side surfaces of the first lens 100, the second lens 200, and the seventh lens 700 are all convex. The object-side and image-side surfaces of the third lens 300, the fifth lens 500, and the sixth lens 600 are all concave. The object-side and image-side surfaces of the fourth lens 400 are both convex.

[0110] The following table is Figure 5 , Figure 6 The specific parameters of the optical lens 010 of the third embodiment shown.

[0111]

[0112]

[0113] The table below shows the curvature, thickness, spacing, refractive index, and Abbe number of each lens in the optical lens 010 in the third embodiment.

[0114]

[0115] Figure 7 This is a schematic diagram of the optical lens 010 in the fourth embodiment of this application from the perspective of the sagittal direction; Figure 8 This is a schematic diagram of the optical lens 010 in the fourth embodiment of this application under a meridional viewing angle. Figure 7 and Figure 8 As shown, compared with the first embodiment, the shapes and parameters of the first lens group and the second lens group in the fourth embodiment are different.

[0116] exist Figure 7 and Figure 8 In the fourth embodiment shown, the object-side surfaces of the first lens 100, the third lens 300, the fourth lens 400, the sixth lens 600, and the seventh lens 700 are all convex, and the image-side surfaces are all concave. The object-side and image-side surfaces of the second lens 200 are both convex. The object-side and image-side surfaces of the fifth lens 500 are both concave.

[0117] The following table is Figure 7 , Figure 8 The specific parameters of the optical lens 010 of the fourth embodiment shown.

[0118]

[0119]

[0120] The table below shows the curvature, thickness, spacing, refractive index, and Abbe number of each lens in the optical lens 010 in the fourth embodiment.

[0121]

[0122] The conditions for the optical lens 010 in the first to fourth embodiments are satisfied as shown in the table below.

[0123]

[0124]

[0125] When the above conditions are met, the optical lens 010 generally exhibits better imaging quality, can better correct chromatic aberration caused by laser temperature drift, can reduce the impact of temperature on the focal length of the optical lens 010, and is conducive to the miniaturization of the device.

[0126] Figure 9 This is a schematic diagram of the assembly of the optical lens 010 in one embodiment of this application. Figure 9 As shown, the optical lens 010 also includes a first lens barrel 011 and a second lens barrel 012. A first lens group is disposed within the first lens barrel 011, and a second lens group is disposed within the second lens barrel 012. Furthermore, a filter 800 and a protective glass 900 are also disposed within the second lens barrel 012. Figure 9 In this embodiment, the first lens barrel 011 and the second lens barrel 012 are axially connected by a threaded connection. Before assembly, the first lens barrel 011 and the second lens barrel 012 are two separate parts, each carrying a first lens group and a second lens group respectively. During assembly, the positions of the second lens barrel 012 and the second lens group can be actively adjusted. During the assembly process, the camera is placed at the image plane IMA. By adjusting the axial distance of the second lens group relative to the first lens group, the change in the size of the imaging spot is observed. The position is adjusted to the minimum size of the imaging spot at the image plane, indicating that the appropriate assembly position has been reached. Then, the relative positions of the first lens barrel 011 and the second lens barrel 012 are fixed, and the assembly is completed. By making the first lens barrel 011 and the second lens barrel 012 independent before assembly, and adjusting the position of the second lens group relative to the first lens group as a whole during adjustment, the assembly efficiency and yield of the optical lens 010 are improved. In this embodiment, since the first lens barrel 011 and the second lens barrel 012 are threadedly connected, the distance between the first lens group and the second lens group can be adjusted by screwing the second lens barrel 012. This adjustment method is stable, reliable, and highly accurate. After screwing it in place, glue can be used to reinforce it and maintain the relative positions of the first lens barrel 011 and the second lens barrel 012.

[0127] Figure 10 This is a schematic diagram of the assembly of the optical lens 010 in another embodiment of this application. Figure 10 Examples and Figure 9 The difference in this embodiment is that there is no threaded connection between the first lens barrel 011 and the second lens barrel 012, and the assembly method is the same as... Figure 9 The same implementation method is used. First, fix the position of the first lens barrel 011, adjust the position of the second lens barrel 012, observe the change in the size of the imaging spot, and after adjusting to a suitable position, use an adhesive (such as glue) to bond and fix the first lens barrel 011 and the second lens barrel 012 together.

[0128] The optical lens provided in this application embodiment can be called an optical module. This application does not limit the name of the optical lens. The optical lens 010 can be applied to various electronic devices, such as lidar or automobiles.

[0129] This application also provides a lidar (not shown in the figure), including the optical lens 010 provided in the above embodiments of this application. The lidar may include a transmitting module and a receiving module, wherein the transmitting module includes a laser for emitting a detection laser; the receiving module includes the optical lens 010 and a receiver, and the echo beam enters the receiver after passing through the optical lens 010. Optionally, the photosensitive surface of the receiver is disposed at the image plane IMA.

[0130] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An optical lens characterized in that, The optical lens comprises a first lens group and a second lens group arranged in sequence from the object side to the image side along the direction of extension of the optical axis, the first lens group has positive refractive power, and the second lens group has negative refractive power; The first lens group comprises, in sequence from the object side to the image side along the direction of extension of the optical axis: a first lens having positive refractive power; a second lens having positive refractive power; a third lens having negative refractive power; and a fourth lens having positive refractive power; The second lens group comprises, in sequence from the object side to the image side along the direction of extension of the optical axis: a fifth lens having negative refractive power, the image side surface of the fifth lens being concave, or both the object side surface and the image side surface of the fifth lens being concave; a sixth lens having negative refractive power, the object side surface of the sixth lens being convex, the image side surface of the sixth lens being concave, or both the object side surface and the image side surface of the sixth lens being concave; and a seventh lens having negative refractive power, the object side surface of the seventh lens being convex, and the image side surface of the seventh lens being concave. The object side surface of the first lens is convex, the image side surface of the first lens is concave, or both the object side surface and the image side surface of the first lens are convex; 2. The optical lens of claim 1, wherein, and / or, the object side surface of the second lens is convex, the image side surface of the second lens is concave, or both the object side surface and the image side surface of the second lens are convex; and / or, the object side surface of the third lens is convex, the image side surface of the third lens is concave, or both the object side surface and the image side surface of the third lens are concave; and / or, the object side surface of the fourth lens is convex, the image side surface of the fourth lens is concave, or both the object side surface and the image side surface of the fourth lens are convex. The seventh lens has negative refractive power in the meridional direction, the seventh lens has no refractive power in the sagittal direction, and the meridional direction, the sagittal direction and the direction of extension of the optical axis are perpendicular to each other.

3. The optical lens of claim 1, wherein, The seventh lens is a cylindrical lens.

4. The optical lens of claim 3, wherein, The focal length of the optical lens in the meridional direction is 270-280 mm, and the focal length of the optical lens in the sagittal direction is 210-225 mm.

5. The optical lens of claim 3, wherein, The focal length of the first lens group is 45-55 mm, the focal length of the second lens group in the meridional direction is -3.7--2.1 mm, and the focal length of the second lens group in the sagittal direction is -5.7--3.6 mm.

6. The optical lens of claim 3, wherein, The focal length of the first lens is 140-166 mm; 7. The optical lens of claim 6, wherein, and / or, the focal length of the second lens is 65-77 mm; and / or, the focal length of the third lens is -81--72 mm; and / or, the focal length of the fourth lens is 46-79 mm; and / or, the focal length of the fifth lens is -53--34 mm; and / or, the focal length of the sixth lens is -9--5 mm; and / or, the focal length of the seventh lens in the meridional direction is -32--15 mm. The total optical length TTL of the optical lens satisfies 80 mm≤TTL≤95 mm.

8. The optical lens of any of claims 1-7, wherein, The distance d45 between the fourth lens and the fifth lens on the optical axis satisfies the relationship: 0.1≤d45 / TTL≤0.2; 9. The optical lens of claim 8, wherein, ​ A spacing d56 of the fifth lens and the sixth lens on the optical axis satisfies a relationship: 0.1≤d56 / TTL≤0.

2.

10. The optical lens of any of claims 1-7, wherein, A refractive index of the first lens is not less than 1.

7.

11. The optical lens of any of claims 1-7, wherein, An Abbe number Vd2 of the second lens and an Abbe number Vd1 of the first lens satisfy a relationship: 25≤Vd2-Vd1≤30.

12. The optical lens of any of claims 1-7, wherein, An Abbe number Vd2 of the second lens and an Abbe number Vd3 of the third lens satisfy a relationship: 45≤Vd2-Vd3≤60.

13. The optical lens of any of claims 1-7, wherein, An Abbe number Vd2 of the second lens and an Abbe number Vd4 of the fourth lens satisfy a relationship: 15≤Vd2-Vd4≤30.

14. The optical lens of any of claims 1-7, wherein, An Abbe number Vd2 of the second lens and an Abbe number Vd5 of the fifth lens satisfy a relationship: 40≤Vd2-Vd5≤50.

15. The optical lens of any of claims 1-7, wherein, The optical lens satisfies a relationship: 15≤D / H / FOV≤25, wherein D is a maximum optical aperture of the first lens, FOV is a lens field of view angle, and H is an image height corresponding to a maximum field of view angle.

16. The optical lens of any of claims 1-7, wherein, An absolute value of a temperature coefficient of a refractive index of the second lens and the fourth lens is not less than 7x10 -6 / ℃.

17. The optical lens of any of claims 1-7, wherein, The optical lens further comprises a filter and a protective glass, the protective glass is arranged on an image side of the seventh lens, and the filter is arranged between the protective glass and the seventh lens.

18. The optical lens of any of claims 1-7, wherein, The optical lens further comprises a first lens barrel and a second lens barrel, the first lens group is arranged in the first lens barrel, the second lens group is arranged in the second lens barrel, and the first lens barrel and the second lens barrel are axially connected through threads and / or adhesives.

19. A lidar, comprising: An optical lens according to any one of claims 1-18. An optical lens according to any one of claims 1-18.

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