A vehicle-mounted optical lens

Abstract

A kind of vehicle-mounted optical lens, including first lens, second lens, third lens, diaphragm, fourth lens, fifth lens, sixth lens, filter and imaging surface arranged from object side to image side along optical axis, the first lens is glass spherical lens, with negative optical power, its image side is concave;The second lens is glass spherical lens, with negative optical power, its object side is concave, image side is concave;The third lens is glass spherical lens, with positive optical power, its object side is convex, image side is convex;The fourth lens is glass aspherical lens, with positive optical power, its object side is convex, image side is concave;The fifth lens is glass spherical lens, with positive optical power, its object side is convex;The sixth lens is glass aspherical lens, with positive optical power, its object side is convex, image side is convex.

Description

Technical Field

[0001] This application relates to the field of optical imaging equipment technology, and in particular to a vehicle-mounted optical lens. Background Technology

[0002] Optical lenses play a crucial role in vehicle driver assistance systems. Automotive optical lenses, in particular, are installed inside or outside the vehicle's cabin. They monitor the road conditions ahead by projecting images onto sensors through the lens, or are used in advanced driver assistance systems (ADAS). Automotive lenses are vital in autonomous driving systems, and for safety reasons, automotive-grade optical lenses face more stringent requirements in certain optical parameters, especially in terms of resolution performance.

[0003] Chinese patent discloses an infrared confocal wide-angle lens (application number: CN110221401A), which, from the object side to the image side, comprises: a front lens group, an aperture stop, a rear lens group, a filter, a protective glass, and a photosensitive chip; the front lens group has a negative optical power and includes: a first lens, which has a negative optical power, with a convex surface facing the object side and a concave surface facing the image side; a second lens, which has a negative optical power and both surfaces of the second lens are concave; and a third lens, which has a positive optical power and both surfaces of the third lens are concave. All surfaces are convex; the optical power of the rear lens group is positive, and the rear lens group includes: a fourth lens, the optical power of the fourth lens is negative, the object-side surface of the fourth lens is convex, and the image-side surface of the fourth lens is concave; a fifth lens, the optical power of the fifth lens is positive, and both surfaces of the fifth lens are convex; a sixth lens, the optical power of the sixth lens is positive, and both surfaces of the sixth lens are convex; a seventh lens, the optical power of the seventh lens is negative, and both surfaces of the seventh lens are concave; and an eighth lens, the optical power of the eighth lens is positive, and both surfaces of the eighth lens are convex.

[0004] In order to collect more light, existing optical lenses need to have their FNO (Frequency of Noise) value as small as possible. Furthermore, certain lenses also require high resolution to achieve sharp images. However, generally speaking, the smaller the FNO, the blurrier the image; therefore, it is difficult to achieve high resolution with lenses that have a small FNO.

[0005] At the same time, the lens structure in existing technologies is complex and cannot adapt to the increasingly compact in-vehicle environment. Summary of the Invention

[0006] The purpose of this application is to provide a vehicle-mounted optical lens that consists of only six glass lenses, which has the advantage of simple structure; and in addition to ensuring a wide field of view and a small FNO value, it can also achieve high resolution.

[0007] The technical solution adopted in this application is:

[0008] A vehicle-mounted optical lens includes a first lens, a second lens, a third lens, an aperture stop, a fourth lens, a fifth lens, a sixth lens, a filter, and an imaging plane arranged along the optical axis from the object side to the image side.

[0009] The first lens is a glass spherical lens with negative optical power and its image side is concave.

[0010] The second lens is a glass spherical lens with negative optical power, and its object side and image side are both concave.

[0011] The third lens is a glass spherical lens with positive optical power, and its object side and image side are both convex.

[0012] The fourth lens is a glass aspherical lens with positive optical power, its object side is convex and its image side is concave.

[0013] The fifth lens is a glass spherical lens with positive optical power and a convex object side.

[0014] The sixth lens is a glass aspherical lens with positive optical power, and its object side and image side are both convex.

[0015] According to an embodiment of the present invention, the object-side surface of the first lens is concave.

[0016] According to an embodiment of the present invention, the object-side surface of the first lens is convex.

[0017] According to an embodiment of the present invention, the image-side surface of the fifth lens is concave.

[0018] According to an embodiment of the present invention, the image-side surface of the fifth lens is convex.

[0019] According to an embodiment of the present invention, the total focal length F of the vehicle-mounted optical lens and the total optical length TTL of the vehicle-mounted optical lens satisfy the following condition: TTL / F≤10.

[0020] According to an embodiment of the present invention, the maximum field of view (FOV) of the vehicle-mounted optical lens, the aperture D of the object-side surface of the first lens corresponding to the maximum field of view, and the image height H corresponding to the maximum field of view of the vehicle-mounted optical lens satisfy the following relationship: D / H / FOV ≤ 0.02. The smaller aperture of the first lens ensures a smaller aperture at the front end of the lens, enabling miniaturization of the overall lens specifications and reducing material costs in production.

[0021] According to an embodiment of the present invention, the entrance pupil diameter ENPD of the vehicle-mounted optical lens and the total optical length TTL of the vehicle-mounted optical lens satisfy the following condition: ENPD / TTL ≥ 0.14, in order to reduce the FNO value.

[0022] According to an embodiment of the present invention, the maximum field of view (FOV) of the vehicle-mounted optical lens, the total focal length (F) of the vehicle-mounted optical lens, and the image height (H) corresponding to the maximum field of view of the vehicle-mounted optical lens satisfy the following condition: (FOV×F) / H≥75; thereby meeting the wide-angle requirement of the lens.

[0023] According to an embodiment of the present invention, the optical back focal length (BFL) of the vehicle-mounted optical lens and the total optical length (TTL) of the vehicle-mounted optical lens satisfy the following condition: BFL / TTL ≥ 0.1. Lengthening the relative length of the back focal length facilitates the installation and fixation of the lens module.

[0024] According to an embodiment of the present invention, the focal length F1 of the first lens and the total focal length F of the vehicle-mounted optical lens satisfy the following condition: -4≤F1 / F≤-1;

[0025] The focal length F2 of the second lens satisfies the following relationship with the total focal length F of the vehicle-mounted optical lens: -5≤F2 / F≤-1;

[0026] The focal length F3 of the third lens and the total focal length F of the vehicle-mounted optical lens satisfy the following condition: 1≤F3 / F≤4.

[0027] The focal length F4 of the fourth lens satisfies the following relationship with the total focal length F of the vehicle-mounted optical lens: 2≤F4 / F≤7;

[0028] The focal length F5 of the fifth lens and the total focal length F of the vehicle-mounted optical lens satisfy the following condition: 5≤F5 / F≤20.

[0029] The focal length F6 of the sixth lens satisfies the following relationship with the total focal length F of the vehicle-mounted optical lens: 3≤F6 / F≤6.

[0030] By controlling the focal length of the third lens, the light path before and after the aperture stop is controlled, making the lens structure more compact; at the same time, the focal length of the sixth lens is shortened, which helps the lens to collect light, ensures the amount of light transmitted, and improves the relative illumination of the lens.

[0031] According to an embodiment of the present invention, the central radius of curvature R2 of the image side of the first lens and the central radius of curvature R3 of the object side of the second lens satisfy the following: -4.2≤(R2-R3) / (R2+R3)≤1.

[0032] According to an embodiment of the present invention, the focal length F3 of the third lens and the focal length F4 of the fourth lens satisfy the following condition: 0.5 ≤ |F3 / F4| ≤ 1.2.

[0033] According to an embodiment of the present invention, the center distance d34 between the third lens and the fourth lens satisfies the following condition with respect to the total optical length TTL of the vehicle-mounted optical lens: 0.02≤d34 / TTL≤0.1.

[0034] According to an embodiment of the present invention, the central radius of curvature R2 of the image side of the first lens and the total focal length F of the vehicle-mounted optical lens satisfy the following condition: 2≤R2 / F≤6.

[0035] The beneficial effects of this application are as follows:

[0036] It has a simple structure, consisting of only six lenses.

[0037] The first lens has negative optical power, which reduces the front aperture and improves image quality while avoiding excessive divergence of object-side light. This is beneficial for controlling the aperture of the rear lens, thereby achieving miniaturization of the overall lens structure.

[0038] The second lens has negative optical power, which further diverges the light, thus increasing the aperture and improving image quality.

[0039] The optical lens of this application can achieve high resolution while ensuring a large incident angle and a small FNO value. Attached Figure Description

[0040] The present application will be described in further detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present application. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0041] Figure 1This is a schematic diagram of the structure of the vehicle-mounted optical lens provided in Embodiment 1.

[0042] Figure 2 This is a schematic diagram of the structure of the vehicle-mounted optical lens provided in Embodiment 2.

[0043] Figure 3 This is a schematic diagram of the structure of the vehicle-mounted optical lens provided in Embodiment 3.

[0044] Figure 4 This is a schematic diagram of the structure of the vehicle-mounted optical lens provided in Embodiment 4.

[0045] In the diagram: 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Sixth lens; 7. Optical axis; 8. Aperture stop; 9. Filter; 10. Imaging plane. Detailed Implementation

[0046] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention 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 the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0047] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0050] The following is an explanation of the meaning of each optical parameter in this application:

[0051] G1: First lens; S1: Object side of the first lens; S2: Image side of the first lens.

[0052] G2: Second lens; S3: Object side of the second lens; S4: Image side of the second lens.

[0053] G3: Third lens; S5: Object side of the third lens; S6: Image side of the third lens.

[0054] G4: Fourth lens; S8: Object side of the fourth lens; S9: Image side of the fourth lens.

[0055] G5: Fifth lens; S10: Object side of the fifth lens; S11: Image side of the fifth lens.

[0056] G6: Sixth lens; S12: Object side of the sixth lens; S13: Image side of the sixth lens.

[0057] S14: Object side of the filter; S15: Image side of the filter.

[0058] FOV: The maximum field of view of an automotive optical lens.

[0059] H: Image height corresponding to the maximum field of view of the vehicle-mounted optical lens.

[0060] F: The total focal length of the vehicle-mounted optical lens.

[0061] D: The maximum aperture of the first lens object side corresponding to the maximum field of view of the vehicle-mounted optical lens.

[0062] TTL: The total optical length of the vehicle-mounted optical lens, which is the distance from the object-side center of the first lens G1 of the vehicle-mounted optical lens to the center of the imaging focal plane of the vehicle-mounted optical lens.

[0063] BFL: The optical back focal length of the vehicle-mounted optical lens, which is the distance from the center of the image side of the last lens of the vehicle-mounted optical lens to the center of the imaging plane.

[0064] Fm (m = 1, 2, 3, ...): The focal length of the m-th lens of the vehicle-mounted optical lens.

[0065] R1, R2, R3, R4…: These are the radii of curvature of the first and second surfaces of the first lens, the first and second surfaces of the second lens, and so on.

[0066] ENPD: Entrance pupil diameter of automotive optical lenses.

[0067] d34: The center distance d34 between the third lens G3 and the fourth lens G4.

[0068] FNO: Lens light transmission capability.

[0069] The vehicle-mounted optical lens comprises a first lens 1, a second lens 2, a third lens 3, an aperture 8, a fourth lens 4, a fifth lens 5, a sixth lens 6, a filter 9, and an imaging surface 10 arranged sequentially along the optical axis 7 from the object side to the image side.

[0070] The first lens 1 has negative optical power and its image-side surface is concave. The second lens 2 has negative optical power and its object-side surface is concave, as is its image-side surface. The third lens 3 has positive optical power and its object-side surface is convex, as is its image-side surface. The fourth lens 4 has positive optical power and its object-side surface is convex, as is its image-side surface. The fifth lens 5 has positive optical power and its object-side surface is convex. The sixth lens 6 has positive optical power and its object-side surface is convex, as is its image-side surface. In this application, the first lens 1 is a spherical glass lens; the second lens 2 is a spherical glass lens; the third lens 3 is a spherical glass lens; the fourth lens 4 is a glass aspherical lens; the fifth lens 5 is a spherical glass lens; and the sixth lens 6 is a glass aspherical lens. The use of aspherical lenses for the fourth lens 4 and the sixth lens 6 can minimize aberrations during imaging, thereby improving the lens's image quality and meeting high resolution requirements. The first lens 1 is set to negative optical power, which reduces the front aperture and improves image quality while avoiding excessive divergence of object-side light. This also facilitates control of the rear lens aperture, thereby achieving a miniaturized overall lens structure to meet more application scenarios. The second lens 2 is also set to have negative optical power, further diverging the light and increasing the aperture. The aperture stop 8, located between the third lens 3 and the fourth lens 4, also helps to increase the aperture, thus meeting the small FNO requirement.

[0071] Preferably, the maximum field of view (FOV) of the vehicle-mounted optical lens, the total focal length (F) of the vehicle-mounted optical lens, and the image height (H) corresponding to the maximum field of view of the vehicle-mounted optical lens satisfy the following relationship: (FOV×F) / H≥75. This results in a shorter focal length and a wider angle of view for the lens in this application, achieving the wide-angle requirement.

[0072] Ignoring distortion, the relationship between the entire set of focal length values ​​F, field of view (FOV), and image height H is: F = H / tan(FOV); that is, for the same focal length value, the larger the image height (the size of the sensor matching the imaging surface), the larger the field of view (FOV); for the same image height, the larger the focal length value, the smaller the field of view (FOV); the condition (FOV×F) / H≥75 indicates that under the same focal length value and matching sensor of the same size, the field of view is large, achieving the requirement of wide angle.

[0073] Preferably, the maximum field of view (FOV) of the vehicle-mounted optical lens, the aperture D of the object-side surface of the first lens 1 corresponding to the maximum field of view, and the image height H corresponding to the maximum field of view of the vehicle-mounted optical lens satisfy the following relationship: D / H / FOV ≤ 0.02. Reducing the front aperture of the object-side surface of the first lens 1 achieves miniaturization of the overall lens structure. Furthermore, when installing the lens, the first lens 1 can adapt to small-sized environments, and the smaller aperture also saves on material costs during production.

[0074] Ignoring distortion, the relationship between the focal length F, field of view (FOV), and image height (H) is: F = H / tan(FOV). That is, for the same optical architecture, as the focal length increases, the lens diameter also increases proportionally. When the condition D / H / FOV ≤ 0.02 is met, it means that the lens diameter is smaller for the same focal length, thus achieving miniaturization of the overall lens structure.

[0075] Preferably, the focal length F of the entire group of the vehicle-mounted optical lens and the total optical length TTL of the vehicle-mounted optical lens satisfy the following condition: TTL / F≤10.

[0076] According to embodiments of the present invention, by controlling the overall length of the lens, a smaller optical lens can be obtained.

[0077] Preferably, the optical back focal length (BFL) of the vehicle-mounted optical lens and the total optical length (TTL) of the vehicle-mounted optical lens satisfy the following relationship: BFL / TTL ≥ 0.1. While controlling the overall lens size to be miniaturized, lengthening the relative length of the lens's back focal length facilitates the installation and fixation of the lens module, makes the lens installation more stable, and allows for the installation of connecting parts at the mounting point for connecting or fixing the back focal length.

[0078] Preferably, the entrance pupil diameter (ENPD) of the vehicle-mounted optical lens and the total optical length (TTL) of the vehicle-mounted optical lens satisfy the condition: ENPD / TTL ≥ 0.14. This satisfies the requirement for a smaller FNO value.

[0079] Preferably, the center distance d34 between the third lens 3G3 and the fourth lens 4G4 satisfies the following condition with respect to the total optical length TTL of the vehicle-mounted optical lens: 0.02≤d34 / TTL≤0.1.

[0080] Controlling the center distance between the front and rear lens elements of the aperture stop allows for a smoother transition of light by controlling the lower limit of the distance, thereby improving image resolution. Controlling the upper limit of the distance helps to control the overall length of the lens, enabling miniaturization of the overall lens structure.

[0081] Preferably, the focal length F3 of the third lens 3 and the focal length F4 of the fourth lens 4 satisfy the following condition: 0.5 ≤ |F3 / F4| ≤ 1.2. This improves the overall resolution of the lens.

[0082] Having similar focal lengths between adjacent lenses facilitates a smooth transition of light and improves image resolution.

[0083] Preferably, the central radius of curvature R2 of the image side of the first lens 1 and the central radius of curvature R3 of the object side of the second lens 2 satisfy the following: -4.2≤(R2-R3) / (R2+R3)≤1.

[0084] This corrects the aberrations of the optical system and ensures that when the light rays emitted from the first lens 1 are incident on the first surface G2R1 of the second lens 2, the incident light rays are relatively smooth, thereby reducing the tolerance sensitivity of the optical system.

[0085] Preferably, the focal length F1 of the first lens 1 satisfies the following relationship with the total focal length F of the vehicle-mounted optical lens: -4≤F1 / F≤-1; the focal length F2 of the second lens 2 satisfies the following relationship with the total focal length F of the vehicle-mounted optical lens: -5≤F2 / F≤-1; the focal length F3 of the third lens 3 satisfies the following relationship with the total focal length F of the vehicle-mounted optical lens: 1≤F3 / F≤4; the focal length F4 of the fourth lens 4 satisfies the following relationship with the total focal length F of the vehicle-mounted optical lens: 2≤F4 / F≤7; the focal length F5 of the fifth lens 5 satisfies the following relationship with the total focal length F of the vehicle-mounted optical lens: 5≤F5 / F≤20; and the focal length F6 of the sixth lens 6 satisfies the following relationship with the total focal length F of the vehicle-mounted optical lens: 3≤F6 / F≤6. By properly controlling the focal length of the third lens 3, the light path before and after the aperture stop 8 is controlled, making the lens structure more compact and further reducing the lens size. Furthermore, setting the focal length of the sixth lens 6 to be shorter helps the lens of this application to collect light, improving relative illumination while ensuring sufficient light transmission, ultimately enhancing image quality.

[0086] Preferably, the central radius of curvature R2 of the image side of the first lens 1 satisfies the following relationship with the total focal length F of the vehicle-mounted optical lens: 2≤R2 / F≤6.

[0087] Furthermore, this application will propose different implementation schemes based on the above-described embodiments.

[0088] Example 1

[0089] Please refer to Figure 1 In this embodiment, the object side of the first lens 1 is concave, and the image side of the fifth lens 5 is concave.

[0090] In this embodiment, the radius of curvature R, thickness T, refractive index Nd, and Abbe number Vd of each lens of the vehicle-mounted optical lens satisfy the following Table 1; wherein, the units of radius of curvature R and thickness T are millimeters.

[0091] Face number radius of curvature R Thickness T Refractive index Nd Abbe number Vd S1 -100.000 1.300 1.804 46.568 S2 10.374 6.000 S3 -20.186 1.300 1.620 60.344 S4 16.798 4.899 S5 19.629 5.500 1.904 31.420 S6 -47.803 0.886 Aperture endless 0.070 S8 14.200 5.000 1.589 61.163 S9 -91.327 3.249 S10 23.346 5.000 1.497 81.595 S11 47.261 1.087 S12 13.268 4.900 1.743 49.336 S13 -52.289 2.312 S14 endless 1.000 1.517 64.212 S15 endless 1.234 Image endless /

[0092] Table 1

[0093] In this embodiment, the fourth lens 4 is an aspherical lens, with both its object-side surface S8 and image-side surface S9 being aspherical. The sixth lens 6 is an aspherical lens, with both its object-side surface S12 and image-side surface S13 being aspherical.

[0094] The aspherical surface shape Z is defined by the following formula:

[0095]

[0096] Where Z is the distance vector from the vertex of the aspherical surface along the optical axis 7 at a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R (that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; A, B, C, D, and E are all higher-order coefficients.

[0097] Table 2 below shows the conic coefficient k and higher-order coefficients A, B, C, D and E for the aspherical lens surfaces S8, S9, S12 and S13 that can be used in Example 1.

[0098] Face number K A B C D E S8 -0.0137 -3.42E-05 1.38E-07 -1.11E-08 1.42E-10 -1.98E-12 S9 -70.4336 1.98E-04 -3.61E-06 8.73E-08 -1.13E-09 4.43E-12 S12 -3.3229 4.23E-06 -2.26E-06 -1.35E-07 3.38E-09 -8.05E-11 S13 -100.0000 1.21E-04 -4.17E-06 -3.25E-07 8.17E-09 -7.30E-11

[0099] Table 2

[0100] Example 2

[0101] Please refer to Figure 2 In this embodiment, the object side of the first lens 1 is concave, and the image side of the fifth lens 5 is convex.

[0102] In this embodiment, the radius of curvature R, thickness T, refractive index Nd, and Abbe number Vd of each lens of the vehicle-mounted optical lens satisfy the following Table 3; wherein, the units of radius of curvature R and thickness T are millimeters.

[0103] Face number radius of curvature R Thickness T Refractive index Nd Abbe number Vd S1 -100.000 1.300 1.804 46.568 S2 9.588 6.000 S3 -55.246 1.300 1.620 60.344 S4 15.118 5.072 S5 16.995 5.500 1.904 31.420 S6 -77.607 0.900 Aperture Infinity 0.100 S8 14.898 5.000 1.589 61.163 S9 -148.433 2.765 S10 24.281 5.000 1.497 81.595 S11 -50.000 1.000 S12 13.192 4.500 1.743 49.336 S13 63.495 2.312 S14 Infinity 1.000 1.517 64.212 S15 Infinity 0.969 Image Infinity /

[0104] Table 3

[0105] Table 4 below shows the conic coefficient k and higher-order coefficients A, B, C, D and E of the aspherical lens surfaces S8, S9, S12 and S13 that can be used in this embodiment.

[0106] Face number K A B C D E S8 -0.6451 6.87E-06 -7.45E-07 1.86E-08 -2.90E-10 3.85E-13 S9 -100.0000 1.42E-04 -1.14E-06 9.34E-08 -1.86E-09 1.23E-11 S12 -2.7969 4.23E-06 -2.26E-06 -1.35E-07 3.38E-09 -8.05E-11 S13 -100.0000 1.51E-04 -7.27E-06 -2.00E-07 1.36E-09 2.47E-11

[0107] Table 4

[0108] Example 3

[0109] Please refer to Figure 3 In this embodiment, the object side of the first lens 1 is convex, and the image side of the fifth lens 5 is concave.

[0110] In this embodiment, the radius of curvature R, thickness T, refractive index Nd, and Abbe number Vd of each lens of the vehicle-mounted optical lens satisfy the following Table 5; wherein, the units of radius of curvature R and thickness T are millimeters.

[0111] Face number radius of curvature R Thickness T Refractive index Nd Abbe number Vd S1 100.000 1.300 1.804 46.568 S2 11.300 5.525 S3 -19.000 1.300 1.620 60.344 S4 11.281 7.083 S5 17.303 5.400 1.904 31.420 S6 -117.654 1.256 Aperture Infinity 0.070 S8 15.000 5.000 1.589 61.163 S9 200.000 3.195 S10 16.007 5.000 1.497 81.595 S11 50.000 1.000 S12 13.506 4.900 1.743 49.336 S13 -336.083 2.312 S14 Infinity 1.000 1.517 64.212 S15 Infinity 1.553 Image Infinity /

[0112] Table 5

[0113] Table 6 below shows the conic coefficient k and higher-order coefficients A, B, C, D and E of the aspherical lens surfaces S8, S9, S12 and S13 that can be used in this embodiment.

[0114] Face number K A B C D E S8 -1.4896 2.63E-05 -2.05E-06 4.09E-08 -5.71E-10 2.41E-12 S9 100.0000 5.67E-05 -2.69E-08 9.25E-09 -3.91E-10 3.35E-12 S12 -3.5924 -2.29E-05 -7.11E-06 -3.74E-07 1.38E-08 -2.10E-10 S13 -100.0000 -2.79E-04 -5.41E-06 -1.51E-07 4.85E-09 -4.17E-11

[0115] Table 6

[0116] Example 4

[0117] Please refer to Figure 4 In this embodiment, the object side of the first lens 1 is convex, and the image side of the fifth lens 5 is convex.

[0118] In this embodiment, the radius of curvature R, thickness T, refractive index Nd, and Abbe number Vd of each lens of the vehicle-mounted optical lens satisfy the following Table 7; wherein, the units of radius of curvature R and thickness T are millimeters.

[0119] Face number radius of curvature R Thickness T Refractive index Nd Abbe number Vd S1 120.000 1.300 1.804 46.568 S2 11.976 5.372 S3 -19.500 1.300 1.620 60.344 S4 11.819 6.091 S5 16.236 5.500 1.904 31.420 S6 -127.121 1.095 Aperture Infinity 0.070 S8 15.000 5.000 1.589 61.163 S9 122.951 2.688 S10 23.032 5.000 1.497 81.595 S11 -60.000 1.087 S12 12.812 4.900 1.743 49.336 S13 -100.000 2.312 S14 Infinity 1.000 1.517 64.212 S15 Infinity 1.531 Image Infinity /

[0120] Table 7

[0121] Table 8 below shows the conic coefficient k and higher-order coefficients A, B, C, D and E of the aspherical lens surfaces S8, S9, S12 and S13 that can be used in this embodiment.

[0122] Face number K A B C D E 8 -1.4233 2.88E-05 -1.70E-06 4.09E-08 -7.24E-10 3.76E-12 9 100.0000 1.47E-04 8.33E-07 -1.73E-08 -1.58E-10 4.11E-12 12 -1.9091 5.06E-05 -5.38E-06 -2.64E-07 1.10E-08 -1.87E-10 13 100.0000 -2.76E-05 -1.32E-06 -4.43E-07 9.79E-09 -7.17E-11

[0123] Table 8

[0124] Based on the above embodiments, Table 9 below provides the following information for each specific embodiment: the overall focal length F of the vehicle-mounted optical lens, the maximum field of view (FOV) of the vehicle-mounted optical lens, the image height H corresponding to the maximum field of view of the vehicle-mounted optical lens, the total optical length (TTL) of the vehicle-mounted optical lens, the optical back focal length (BFL) of the vehicle-mounted optical lens, the entrance pupil diameter (ENPD) of the vehicle-mounted optical lens, the center distance d34 between the third lens 3 and the fourth lens 4, the focal lengths F1-F6 of the first lens 1 to the sixth lens 6, the central radius of curvature R2 of the image side surface S2 of the first lens 1, and the central radius of curvature R3 of the object side surface S3 of the second lens 2.

[0125] Example 1 Example 2 Example 3 Example 4 FOV (°) 150.000 150.000 150.000 150.000 F(mm) 4.462 4.465 4.694 4.475 D(mm) 20.620 20.788 22.660 22.527 H(mm) 8.764 8.786 9.018 8.844 TTL(mm) 43.737 42.718 45.310 44.246 BFL (mm) 4.550 4.546 5.022 4.843 ENPD (mm) 6.500 6.500 6.500 6.500 d34(mm) 0.956 1.000 1.326 1.165 F1 (mm) -12.0546 -11.2213 -16.5287 -17.2418 F2 (mm) -15.0566 -19.6143 -11.5907 -12.0566 F3 (mm) 16.75597 16.60122 17.8083 16.98357 F4 (mm) 21.92726 24.00888 28.15927 29.46225 F5 (mm) 88.83174 34.37725 46.20785 34.9233 F6 (mm) 15.22144 22.36613 18.19877 16.11758 R2 (mm) 10.374 9.588 11.300 11.976 R3 (mm) -20.186 -55.246 -19.000 -19.500

[0126] Table 9

[0127] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A vehicle-mounted optical lens, comprising a first lens (1), a second lens (2), a third lens (3), an aperture stop (8), a fourth lens (4), a fifth lens (5), a sixth lens (6), a filter, and an imaging plane (10) arranged along an optical axis (7) from the object side to the image side, characterized in that, The first lens (1) is a glass spherical lens with negative optical power and its image side is concave. The second lens (2) is a glass spherical lens with negative optical power, and its object side is concave and its image side is concave. The third lens (3) is a glass spherical lens with positive optical power, and its object side and image side are both convex. The fourth lens (4) is a glass aspherical lens with positive optical power. Its object side is convex and its image side is concave. The fifth lens (5) is a glass spherical lens with positive optical power and its object side is convex. The sixth lens (6) is a glass aspherical lens with positive optical power. Its object side is convex and its image side is convex.

2. The vehicle-mounted optical lens according to claim 1, characterized in that, The object side of the first lens (1) is concave.

3. The vehicle-mounted optical lens according to claim 1, characterized in that, The object side of the first lens (1) is convex.

4. The vehicle-mounted optical lens according to claim 1, characterized in that, The image-side surface of the fifth lens (5) is concave.

5. The vehicle-mounted optical lens according to claim 1, characterized in that, The image-side surface of the fifth lens (5) is convex.

6. The vehicle-mounted optical lens according to any one of claims 1-5, characterized in that, The total focal length F of the vehicle-mounted optical lens and the total optical length TTL of the vehicle-mounted optical lens satisfy the following condition: TTL / F≤10.

7. The vehicle-mounted optical lens according to any one of claims 1-5, characterized in that, The maximum field of view (FOV) of the vehicle-mounted optical lens, the aperture D of the object side of the first lens (1) corresponding to the maximum field of view, and the image height H corresponding to the maximum field of view of the vehicle-mounted optical lens satisfy the following condition: D / H / FOV≤0.

02.

8. The vehicle-mounted optical lens according to any one of claims 1-5, characterized in that, The entrance pupil diameter ENPD of the vehicle-mounted optical lens and the total optical length TTL of the vehicle-mounted optical lens satisfy the following condition: ENPD / TTL≥0.

14.

9. The vehicle-mounted optical lens according to any one of claims 1-5, characterized in that, The maximum field of view (FOV) of the vehicle-mounted optical lens, the total focal length (F) of the vehicle-mounted optical lens, and the image height (H) corresponding to the maximum field of view of the vehicle-mounted optical lens satisfy the following condition: (FOV×F) / H≥75.

10. The vehicle-mounted optical lens according to any one of claims 1-5, characterized in that, The optical back focal length (BFL) of the vehicle-mounted optical lens and the total optical length (TTL) of the vehicle-mounted optical lens satisfy the following condition: BFL / TTL ≥ 0.

1.

11. The vehicle-mounted optical lens according to any one of claims 1-5, characterized in that, The focal length F1 of the first lens (1) and the total focal length F of the vehicle-mounted optical lens satisfy the following condition: -4≤F1 / F≤-1; The focal length F2 of the second lens (2) satisfies the following relationship with the total focal length F of the vehicle-mounted optical lens: -5≤F2 / F≤-1; The focal length F3 of the third lens (3) and the total focal length F of the vehicle-mounted optical lens satisfy the following condition: 1≤F3 / F≤4; The focal length F4 of the fourth lens (4) and the total focal length F of the vehicle-mounted optical lens satisfy the following condition: 2≤F4 / F≤7; The focal length F5 of the fifth lens (5) and the total focal length F of the vehicle-mounted optical lens satisfy the following condition: 5≤F5 / F≤20; The focal length F6 of the sixth lens (6) satisfies the following relationship with the total focal length F of the vehicle-mounted optical lens: 3≤F6 / F≤6.

12. The vehicle-mounted optical lens according to any one of claims 1-5, characterized in that, The central curvature radius R2 of the image side of the first lens (1) and the central curvature radius R3 of the object side of the second lens (2) satisfy: -4.2≤(R2-R3) / (R2+R3)≤1.

13. The vehicle-mounted optical lens according to any one of claims 1-5, characterized in that, The focal length F3 of the third lens (3) and the focal length F4 of the fourth lens (4) satisfy the following condition: 0.5 ≤ |F3 / F4| ≤ 1.

2.

14. The vehicle-mounted optical lens according to any one of claims 1-5, characterized in that, The center distance d34 between the third lens (3) and the fourth lens (4) satisfies the following condition with respect to the total optical length TTL of the vehicle-mounted optical lens: 0.02≤d34 / TTL≤0.

1.

15. The vehicle-mounted optical lens according to any one of claims 1-5, characterized in that, The central curvature radius R2 of the image side of the first lens (1) satisfies the following relationship with the total focal length F of the vehicle-mounted optical lens: 2≤R2 / F≤6.

Images