A high-definition large-target short-focus lens

Abstract

The application discloses a high-definition large-target short-focus lens, which comprises a first lens group G1, a second lens group G2 and a third lens group G3 arranged in sequence from an object side to an imaging side, the first lens group G1 has a negative focal length, the second lens group G2 has a positive focal length, and the third lens group G3 has a positive focal length, and the lens satisfies the following conditions: -15<=F1 / F<=-1; 1<=F2 / F<=6; 1<=F3 / F<=8; and 1<=TTL / [D / tan(theta)]<=15. The high-definition large-target short-focus lens has a short total length, is beneficial to miniaturization of the lens, has the characteristics of super short focus and large wide angle, has a deep depth of field, has a super large field of view, provides a wider shooting field of view for application scenarios such as vehicle-mounted lenses, and takes more image information, has a larger imaging surface, can match a larger size chip to realize high-definition imaging, and has a large aperture, and can realize high-definition imaging even in a complex light environment.

Description

Technical Field

[0001] This invention belongs to the field of optical imaging lens technology, specifically relating to a high-definition large-area short-focal-length lens. Background Technology

[0002] As people's demands for driving experience continue to increase, the use of automotive optical lenses in intelligent driving is growing, and the status of automotive lenses in the automotive industry is constantly rising. Advanced Driver Assistance Systems (ADAS) play an important role in intelligent driving, using various lenses in combination with sensors to collect environmental information to ensure driver safety.

[0003] Automotive cameras refer to optical lenses installed on automobiles to achieve various functions, including interior cameras, rearview cameras, front cameras, side cameras, and surround-view cameras. Surround-view cameras are used to capture the environment around the vehicle. Images captured by multiple cameras are transmitted to an onboard processor for real-time processing. The processor performs appropriate corrections, stitching, and fusion of these images to generate a continuous, seamless, and comprehensive 360-degree surround-view image. Surround-view cameras generally use wide-angle lenses, which suffer from poor image quality and may not meet user needs.

[0004] To acquire more accurate information, ADAS systems typically require larger, higher-resolution chips. Therefore, automotive lenses usually need to image over a wider field of view, placing increasingly higher demands on the lens's resolution. Furthermore, while smaller lenses facilitate installation while still meeting imaging requirements, this creates a conflict between high resolution and miniaturization in typical automotive lenses, making it impossible to simultaneously meet the requirements for both small front-end diameter and miniaturization.

[0005] Traditional small-aperture sensors paired with ordinary lenses suffer from severe deterioration in edge imaging quality at high resolutions (e.g., 8 megapixels and above). Small-aperture lenses have limited light transmission, requiring a significant increase in sensor gain (ISO) in low-light conditions. This leads to a surge in image noise, a severe degradation in signal-to-noise ratio (SNR), and blurred target features, greatly impacting the accuracy of perception algorithms, such as pedestrian or animal recognition at night. Driving environments often present extreme contrasts, such as entering and exiting tunnels or driving against the light. Lenses themselves need excellent optical design to minimize aberrations and should be paired with high dynamic range sensors to retain more scene information and prevent detail loss due to overexposure or underexposure. Furthermore, the automotive environment demands that lenses maintain stable optical performance under extreme temperatures, severe vibrations, and long-term use. Therefore, traditional automotive lenses, limited by their small image size and relatively small aperture, are increasingly proving inadequate for meeting the stringent requirements of intelligent driving and vehicle safety.

[0006] Therefore, this invention discloses a high-definition large-area short-focal-length lens. Summary of the Invention

[0007] To address the problems in the prior art, the present invention aims to provide a high-definition large-aperture short-focal-length lens that optimizes the lens's optical power, achieving the effects of a large aperture, high pixel count, high resolution, and high definition.

[0008] To achieve the above objectives and technical effects, the technical solution adopted by this invention is as follows: A high-definition, large-aperture, short-focal-length lens includes a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially from the object side to the imaging side. The first lens group G1 has negative optical power, the second lens group G2 has positive optical power, and the third lens group G3 has positive optical power. The high-definition, large-aperture, short-focal-length lens satisfies the following conditions: -15≤F1 / F≤-1 1≤F2 / F≤6 1≤F3 / F≤8 1≤TTL / [D / tan(θ)]≤15 Where F1, F2, and F3 represent the focal lengths of the first lens group G1, the second lens group G2, and the third lens group G3, respectively; F represents the focal length of the high-definition large-area short-focal-length lens; TTL represents the total optical length of the high-definition large-area short-focal-length lens; D represents the maximum effective radius of the first lens group G1 away from the second lens group G2; and θ is the half field of view of the high-definition large-area short-focal-length lens.

[0009] Furthermore, the high-definition large-area short-focal-length lens meets the following conditions: 3.2 <IH / EPD<3.6 Wherein, IH is the true image height corresponding to the maximum field of view of the high-definition large-area short-focal-length lens; EPD is the entrance pupil diameter of the high-definition large-area short-focal-length lens.

[0010] Furthermore, the high-definition large-area short-focal-length lens meets the following conditions: 5.8 <TTL / F<6.4。

[0011] Furthermore, the high-definition large-area short-focal-length lens meets the following conditions: 0.12 <BFL / TTL<0.16 BFL is the thickness from the last element of the third lens group G3 to the center of the image plane.

[0012] Furthermore, the high-definition large-area short-focal-length lens comprises nine or ten lenses.

[0013] Furthermore, the high-definition large-area short-focal-length lens comprises a total of nine lenses: The first lens group G1 includes optical elements L11 and L12 arranged sequentially from the object side to the imaging side; the second lens group G2 includes optical elements L21 and L22 arranged sequentially from the object side to the imaging side; and the third lens group G3 includes optical elements L31, L32, L33, L34, and L35 arranged sequentially from the object side to the imaging side. or, The first lens group G1 includes optical elements L11, L12 and L13 arranged sequentially from the object side to the imaging side; the second lens group G2 includes optical element L21; and the third lens group G3 includes optical elements L31, L32, L33, L34 and L35 arranged sequentially from the object side to the imaging side. or, The first lens group G1 includes optical elements L11, L12, L13 and L14 arranged sequentially from the object side to the imaging side; the second lens group G2 includes optical element L21; and the third lens group G3 includes optical elements L31, L32, L33 and L34 arranged sequentially from the object side to the imaging side.

[0014] Furthermore, the high-definition large-area short-focal-length lens comprises a total of ten lenses: The first lens group G1 includes optical elements L11, L12, L13 and L14 arranged sequentially from the object side to the imaging side; the second lens group G2 includes optical elements L21, L22 and L23 arranged sequentially from the object side to the imaging side; and the third lens group G3 includes optical elements L31, L32 and L33 arranged sequentially from the object side to the imaging side. or, The first lens group G1 includes optical elements L11, L12, L13 and L14 arranged sequentially from the object side to the imaging side; the second lens group G2 includes optical element L21; and the third lens group G3 includes optical elements L31, L32, L33, L34 and L35 arranged sequentially from the object side to the imaging side.

[0015] Furthermore, optical element L11 has negative optical power, optical element L12 has negative optical power, optical element L13 has negative optical power, and optical element L14 has positive optical power. Optical element L11 satisfies the following condition: -1.8≤f11 / F≤-1.4 Where f11 represents the focal length of optical element L11.

[0016] Furthermore, the second lens group G2 includes optical elements L21, L22, and L23 arranged sequentially from the object side to the imaging side. Optical element L21 has positive optical power, optical element L22 has positive optical power, and optical element L23 has negative optical power. Optical element L21 satisfies the following condition: 2.3 ≤ f21 / F ≤ 3.6 Here, f21 represents the focal length of optical element L21.

[0017] Furthermore, optical element L31 has positive optical power, optical element L32 has positive optical power, and optical element L33 has negative optical power. Optical elements L31 and L33 respectively satisfy the following conditions: -5≤f31 / F≤3.2 -8≤f33 / F≤5.5 Where f31 and f33 represent the focal lengths of optical elements L31 and L33, respectively.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a high-definition, large-aperture, short-focal-length lens with a short overall length, which facilitates lens miniaturization. It also features ultra-short focal length and a wide angle of view; the depth of field is deep, ensuring relative sharpness for both the foreground and background of the subject. Furthermore, it boasts an ultra-wide field of view, providing a broader shooting perspective for applications such as automotive lenses, capturing more image information. Its large imaging surface allows for matching with larger chips to achieve high-definition imaging. Finally, its large aperture enables high-definition imaging even in complex lighting environments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 2 The MTF frequency curve of Embodiment 1 of the present invention; Figure 3 This is a graph showing the longitudinal spherical aberration, field curvature, and distortion curves of Embodiment 1 of the present invention, wherein... Figure 3 a is the longitudinal spherical aberration curve. Figure 3 b is the field curvature curve diagram. Figure 3 c represents the distortion curve; Figure 4 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 5 The MTF frequency curve of Embodiment 2 of the present invention; Figure 6 This is a graph showing the longitudinal spherical aberration, field curvature, and distortion curves of Embodiment 2 of the present invention, wherein... Figure 6 a is the longitudinal spherical aberration curve. Figure 6 b is the field curvature curve diagram. Figure 6 c represents the distortion curve; Figure 7 This is a schematic diagram of the structure of Embodiment 3 of the present invention; Figure 8 The MTF frequency curve of Embodiment 3 of the present invention; Figure 9 This is a graph showing the longitudinal spherical aberration, field curvature, and distortion curves of Embodiment 3 of the present invention, wherein... Figure 9 a is the longitudinal spherical aberration curve. Figure 9 b is the field curvature curve diagram. Figure 9 c represents the distortion curve; Figure 10 This is a schematic diagram of the structure of Embodiment 4 of the present invention; Figure 11 The MTF frequency curve of Embodiment 4 of the present invention; Figure 12 This is a graph showing the longitudinal spherical aberration, field curvature, and distortion curves of Embodiment 4 of the present invention, wherein... Figure 12 a is the longitudinal spherical aberration curve. Figure 12 b is the field curvature curve diagram. Figure 12 c represents the distortion curve; Figure 13 This is a schematic diagram of the structure of Embodiment 5 of the present invention; Figure 14 The MTF frequency curve of Embodiment 5 of the present invention; Figure 15 This is a graph showing the longitudinal spherical aberration, field curvature, and distortion curves of Embodiment 5 of the present invention, wherein... Figure 15 a is the longitudinal spherical aberration curve. Figure 15 b is the field curvature curve diagram. Figure 15 c represents the distortion curve. Detailed Implementation

[0020] The present invention will now be described in detail so that its advantages and features can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0021] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0022] like Figure 1-15 As shown, the present invention discloses a high-definition large target area short focal length lens, including a first lens group G1, a second lens group G2 and a third lens group G3 arranged sequentially from the object side to the imaging side. The first lens group G1 has negative optical power, the second lens group G2 has positive optical power and the third lens group G3 has positive optical power.

[0023] In some implementations, the high-definition large-area short-focal-length lens meets the following conditions: -15≤F1 / F≤-1(1) 1≤F2 / F≤6(2) 1≤F3 / F≤8(3) 1≤TTL / [D / tan(θ)]≤15(4) Where F1, F2, and F3 represent the focal lengths of the first lens group G1, the second lens group G2, and the third lens group G3, respectively; F represents the focal length of the high-definition large-area short-focal-length lens; TTL represents the total optical length of the high-definition large-area short-focal-length lens; D represents the maximum effective radius of the first lens group G1 away from the second lens group G2; and θ is the half field of view of the high-definition large-area short-focal-length lens.

[0024] By adopting the above technical solution, a high-definition large-aperture short-focal-length lens can have a large aperture of F1.5 and a large field of view of 133°. Among them, the conditions (1), (2), and (3) specify the range of ratios of optical power between the first lens group G1, the second lens group G2, the third lens group G3 and the high-definition large-aperture short-focal-length lens. By satisfying the conditions (1), (2), and (3), good imaging performance can be maintained while achieving miniaturization. By satisfying the condition (4), the total optical length of the high-definition large-aperture short-focal-length lens can be effectively shortened and the lens weight reduced. At the same time, the requirement of a large field of view can also be met.

[0025] In some embodiments, the high-definition large-area short-focal-length lens disclosed in this invention comprises nine or ten lenses.

[0026] In some specific implementations, the high-definition large-area short-focal-length lens comprises a total of nine lens elements: The first lens group G1 includes optical elements L11 and L12 arranged sequentially from the object side to the imaging side; the second lens group G2 includes optical elements L21 and L22 arranged sequentially from the object side to the imaging side; and the third lens group G3 includes optical elements L31, L32, L33, L34, and L35 arranged sequentially from the object side to the imaging side. or, The first lens group G1 includes optical elements L11, L12 and L13 arranged sequentially from the object side to the imaging side; the second lens group G2 includes optical element L21; and the third lens group G3 includes optical elements L31, L32, L33, L34 and L35 arranged sequentially from the object side to the imaging side. or, The first lens group G1 includes optical elements L11, L12, L13 and L14 arranged sequentially from the object side to the imaging side; the second lens group G2 includes optical element L21; and the third lens group G3 includes optical elements L31, L32, L33 and L34 arranged sequentially from the object side to the imaging side.

[0027] In some specific implementations, the high-definition large-area short-focal-length lens comprises a total of ten lens elements: The first lens group G1 includes optical elements L11, L12, L13 and L14 arranged sequentially from the object side to the imaging side; the second lens group G2 includes optical elements L21, L22 and L23 arranged sequentially from the object side to the imaging side; and the third lens group G3 includes optical elements L31, L32 and L33 arranged sequentially from the object side to the imaging side. or, The first lens group G1 includes optical elements L11, L12, L13 and L14 arranged sequentially from the object side to the imaging side; the second lens group G2 includes optical element L21; and the third lens group G3 includes optical elements L31, L32, L33, L34 and L35 arranged sequentially from the object side to the imaging side.

[0028] In some more specific embodiments, the first lens group G1 includes optical elements L11, L12, L13, and L14 arranged sequentially from the object side to the imaging side. Optical element L11 has negative optical power, optical element L12 has negative optical power, optical element L13 has negative optical power, and optical element L14 has positive optical power. The first lens group G1 satisfies the following condition (5): -1.8≤f11 / F≤-1.4(5) Where f11 represents the focal length of optical element L11. By satisfying condition (5), the total optical length of the high-definition large-area short focal length lens can be shortened while ensuring that it has a small field curvature and field curvature in a large field of view, so that the high-definition large-area short focal length lens has good off-axis field of view imaging quality.

[0029] In some more specific embodiments, optical element L11 has a convex object-side surface and a concave image-side surface. Optical element L12 has negative optical power, and both its object-side and image-side surfaces are concave, which helps to reduce the beam height, reduce system aberrations, and improve image quality. Optical element L13 has a convex object-side surface and a concave image-side surface. By making the negative lens meniscus, the deflection of light on the two surfaces is more "gentle" and "symmetrical," which helps to balance the aberrations generated by light passing through the entire system. Optical element L14 has positive optical power, and both its object-side and image-side surfaces are convex, which helps to compensate for the aberrations generated by the negative lens, reduce the pressure on the rear lens group to correct aberrations, and increase the aperture.

[0030] In some more specific embodiments, optical elements L11, L12, and L13 are spherical glass lenses, and optical element L14 is a convex aspherical glass lens. The use of aspherical lenses not only makes it possible to correct aberrations such as coma and field curvature, but also enables this high-definition, large-aperture, short-focal-length lens to possess large aperture, wide field of view, and excellent imaging performance. Compared to plastic, optical glass contains fewer air bubbles and impurities, and has a more uniform refractive index distribution, ensuring high imaging resolution and contrast. The coefficient of thermal expansion of glass is much lower than that of plastic, and it does not absorb moisture from the air, making it suitable for extreme temperature environments (such as automotive lenses). Therefore, the above structure enables the lens to achieve high imaging quality while maintaining a wide imaging temperature range.

[0031] In some more specific embodiments, the second lens group G2 includes optical elements L21, L22, and L23 arranged sequentially from the object side to the imaging side. Optical element L21 has positive optical power, optical element L22 has positive optical power, and optical element L23 has negative optical power. Optical element L21 satisfies the following condition (6): 2.3≤f21 / F≤3.6(6) Where f21 represents the focal length of optical element L21. By satisfying condition (6), the total length of the high-definition large-area short focal length lens can be shortened while the light collected at the front end is compressed and the light transitions smoothly to the rear, which is beneficial for compensating for the aberrations generated by the front lens and improving image quality.

[0032] In some more specific embodiments, the optical element L21 is a glass spherical lens, with its object side being concave and its image side being convex; the optical element L22 is a glass spherical lens, with its object side being convex and its image side being convex; the optical element L23 is a glass spherical lens, with its object side being concave and its image side being concave. The optical elements L

[0033] In some more specific embodiments, the third lens group G3 includes optical elements L31, L32, and L33 arranged in sequence from the object side to the imaging side. The optical element L31 has a positive optical power, the optical element L32 has a positive optical power, and the optical element L33 has a negative optical power. The optical element L31 and the optical element L33 respectively satisfy the following conditions: -5 ≤ f31 / F ≤ 3.2 (7) -8 ≤ f33 / F ≤ 5.5 (8) where f31 and f33 respectively represent the focal lengths of the optical element L31 and the optical element L33.

[0034] By satisfying the conditional expressions (7) and (8), it is beneficial for the smooth transition of light rays, beneficial for correcting the aberration of the optical lens, and improving the imaging quality of the optical lens.

[0035] In some more specific embodiments, the optical element L33 satisfies the following condition: -8 < f33 / F < 0. By satisfying the above condition, by setting the optical element L33 to have a relatively large negative optical power, the incident light rays can be diverged to a greater extent, causing the peripheral light rays and the central light rays to turn upwards, reaching a higher imaging position, and better realizing the large target surface imaging of the lens, thereby improving the imaging quality.

[0036] In some more specific embodiments, the optical element L31 is a glass spherical lens, with its object side being convex and its image side being convex; the optical element L32 is a glass spherical lens, with its object side being convex and its image side being convex; the optical element L33 is a glass spherical lens, with its object side being concave and its image side being convex. The optical element L31 is responsible for efficiently collecting and converging the light rays from a large-angle field of view, which helps to reduce the aperture of the subsequent lenses, thereby reducing the size and weight of the entire lens. The optical element L32 disperses the aberration burden of the single lens. The two positive lenses can, through their respective curvature combinations, while providing the total optical power, mutually correct a part of the spherical aberration. The optical element L33, with its structural characteristics, can effectively "flatten" the curved image field generated by the first two groups of positive lenses, ensuring that the image is clear from the center to the edge of the picture.

[0037] In some implementations, the true image height (IH) corresponding to the maximum field of view of the high-definition large-area short-focal-length lens and the entrance pupil diameter (EPD) of the high-definition large-area short-focal-length lens satisfy the following conditions: 3.2 <IH / EPD<3.6(9) By satisfying condition (9), the high-definition large-area short-focal-length lens can not only satisfy the large image area, but also ensure that the edge field of view has sufficient image area brightness, preventing vignetting and thus improving the image quality.

[0038] In some implementations, the total optical length (TTL) of the high-definition large-area short-focal-length lens and the effective focal length (F) of the high-definition large-area short-focal-length lens satisfy the following conditions: 5.8 <TTL / F<6.4(10) By satisfying condition (10), a larger field of view and imaging range can be achieved, which can ensure the depth of field of a high-definition large target surface short focal length lens while realizing the large image surface characteristics, thereby improving the imaging quality of the optical system.

[0039] As a further optimization, the total optical length (TTL) of the high-definition large-area short-focal-length lens and the center thickness (BFL) of the last element of the third lens group G3 to the image plane satisfy the following conditions: 0.12 <BFL / TTL<0.16(11) By satisfying condition (11), the ratio of the back focal length of the high-definition large-area short focal length lens to the total optical length of the high-definition large-area short focal length lens can be reasonably configured, which is conducive to achieving a short back focal length of the high-definition large-area short focal length lens. Under the condition that there is enough space for the installation of optical components and focusing, it is conducive to achieving the miniaturization of the high-definition large-area short focal length lens.

[0040] The high-definition large-aperture short-focal-length lens provided by this invention, through specific surface shape matching and reasonable optical power distribution, can improve the image quality of the lens, reduce aberrations, and enhance the image quality of the lens, giving the lens multiple advantages such as large aperture, large field of view, good resolution, large aperture, and high image quality.

[0041] Example 1 like Figure 1-3 As shown, a high-definition large-area short-focal-length lens includes a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially from the object side to the imaging side. The first lens group G1 has negative optical power, the second lens group G2 has positive optical power, and the third lens group G3 has positive optical power.

[0042] High-definition, large-aperture, short-focal-length lenses must meet the following conditions: F1 / F = -3.57 F2 / F=2.97 F3 / F=2.54 TTL / [D / tan(θ)]=3.47 Where F1, F2, and F3 represent the focal lengths of the first lens group G1, the second lens group G2, and the third lens group G3, respectively; F represents the focal length of the high-definition large-area short-focal-length lens; TTL represents the total optical length of the high-definition large-area short-focal-length lens; D represents the maximum effective radius of the first lens group G1 away from the second lens group G2; and θ is the half field of view of the high-definition large-area short-focal-length lens.

[0043] The first lens group G1 includes optical elements L11, L12, L13, and L14 arranged sequentially from the object side to the imaging side. Optical element L11 has negative optical power, optical element L12 has negative optical power, optical element L13 has negative optical power, and optical element L14 has positive optical power.

[0044] Optical element L11 has a convex object-side surface and a concave image-side surface. Optical element L12 has negative optical power, and both its object-side and image-side surfaces are concave, which helps to reduce the beam height, reduce system aberrations, and improve image quality. Optical element L13 has a convex object-side surface and a concave image-side surface. By making the negative lens meniscus, the deflection of light on the two surfaces is more "gentle" and "symmetrical," which helps to balance the aberrations generated by light passing through the entire system. Optical element L14 has positive optical power, and both its object-side and image-side surfaces are convex, which helps to compensate for the aberrations generated by the negative lens, reduces the pressure on the rear lens group to correct aberrations, and increases the aperture.

[0045] Optical elements L11, L12, and L13 are spherical glass lenses, while optical element L14 is a convex aspherical glass lens. The use of aspherical lenses not only makes it possible to correct aberrations such as coma and field curvature, but also gives this high-definition, large-aperture, short-focal-length lens a large aperture, a wide field of view, and excellent imaging performance. Compared to plastic, optical glass contains fewer air bubbles and impurities, and has a more uniform refractive index distribution, ensuring high imaging resolution and contrast. The coefficient of thermal expansion of glass is much lower than that of plastic, and it does not absorb moisture from the air, making it suitable for extreme temperature environments (such as automotive lenses). Therefore, this structure allows the lens to achieve high image quality while maintaining a wide imaging temperature range.

[0046] The first lens group G1 satisfies the following condition (5): f11 / F=-1.52 Where f11 represents the focal length of optical element L11.

[0047] The second lens group G2 includes optical elements L21, L22, and L23 arranged sequentially from the object side to the imaging side. Optical element L21 has positive optical power, optical element L22 has positive optical power, and optical element L23 has negative optical power.

[0048] Optical element L21 is a glass spherical lens with a concave object-side and a convex image-side; optical element L22 is a glass spherical lens with a convex object-side and a convex image-side; and optical element L23 is a glass spherical lens with a concave object-side and a concave image-side. Optical elements L22 and L23 form a cemented doublet lens, which effectively corrects aberrations in the optical lens, improving resolution and achieving high resolution. Simultaneously, the use of a cemented doublet lens helps reduce the lens assembly's tolerance sensitivity to tilt / eccentricity, improving resolution stability and further enhancing system performance.

[0049] Optical element L21 satisfies the following condition (6): f21 / F=2.35 Here, f21 represents the focal length of optical element L21.

[0050] The third lens group G3 includes optical elements L31, L32, and L33 arranged sequentially from the object side to the imaging side. Optical element L31 has positive optical power, optical element L32 has positive optical power, and optical element L33 has negative optical power.

[0051] Optical element L31 is a spherical glass lens with a convex object-side and a convex image-side; optical element L32 is a spherical glass lens with a convex object-side and a convex image-side; optical element L33 is a spherical glass lens with a concave object-side and a convex image-side. Optical element L31 efficiently collects and converges light from a wide field of view, helping to reduce the aperture of subsequent lenses, thereby reducing the overall size and weight of the lens. Optical element L32 distributes the aberration burden of a single lens. The two positive lenses, through their respective curvature combinations, can mutually correct some spherical aberration while providing total optical power. Optical element L33, with its structural characteristics, effectively "flattens" the curved image field produced by the first two sets of positive lenses, ensuring sharp imaging from the center to the edges.

[0052] Optical element L31 and optical element L33 respectively satisfy the following conditions: f31 / F=3.14 f33 / F = -2.79 Where f31 and f33 represent the focal lengths of optical elements L31 and L33, respectively.

[0053] In this embodiment, the optical parameters of each lens are shown in Table 1.

[0054] Table 1 In this embodiment, the optical design values ​​of the high-definition large-area short-focal-length lens are shown in Table 2.

[0055] Table 2 The aspherical surface in a lens is described by the following formula: z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )]1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 Where k is the conic coefficient, A4, A6, A8, and A10 are aspherical coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the aspherical curve and the optical axis, and z is the aspherical depth (the perpendicular distance between a point on the aspherical surface at a distance r from the optical axis and a tangent plane at the vertex of the aspherical optical axis). For convenience, the aspherical surfaces of each lens surface use the aspherical surfaces shown in the above formula. However, the present invention is not limited to the aspherical polynomial form expressed by this formula.

[0056] The aspheric coefficient values ​​are shown in Table 3.

[0057] Table 3 Figure 2 The MTF frequency curve for Example 1 shows that at 120 Lp / mm, the MTF > 0.25, indicating high imaging quality.

[0058] Figure 3 The graph shows the longitudinal spherical aberration, field curvature, and distortion curves for Example 1. Figure 3 a is the longitudinal spherical aberration curve. Figure 3 b is the field curvature curve diagram. Figure 3 c represents the distortion curve. Figure 3 It can be seen that the lens in Example 1 has better image quality, field curvature is better compensated, and distortion is well corrected.

[0059] Example 2 like Figure 4-6As shown, a high-definition large-area short-focal-length lens includes a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially from the object side to the imaging side. The first lens group G1 has negative optical power, the second lens group G2 has positive optical power, and the third lens group G3 has positive optical power.

[0060] The first lens group G1 includes optical elements L11 and L12 arranged sequentially from the object side to the imaging side.

[0061] Optical element L11 has negative optical power, with its object side being convex and its image side being concave.

[0062] The optical element L12 has negative optical power, with a concave object side and a convex image side.

[0063] The second lens group G2 includes optical elements L21 and L22 arranged sequentially from the object side to the imaging side.

[0064] The object side of the optical element L21 is concave, and the image side is convex.

[0065] The object side of the optical element L22 is concave, and the image side is convex.

[0066] The third lens group G3 includes optical elements L31, L32, L33, L34, and L35 arranged sequentially from the object side to the imaging side.

[0067] Both the object side and the image side of the optical element L31 are convex.

[0068] The object-side and image-side surfaces of optical element L32 are concave.

[0069] Both the object side and the image side of the optical element L33 are convex.

[0070] Both the object side and the image side of the optical element L34 are convex.

[0071] The object side of the optical element L35 is concave, and the image side is convex.

[0072] In this embodiment, the optical parameters of each lens are shown in Table 4.

[0073] Table 4 In this embodiment, the optical design values ​​of the high-definition large-area short-focal-length lens are shown in Table 5.

[0074] Table 5 The aspherical surface in a lens is described by the following formula: z=(cr2 ) / {1+[1-(k+1)(c 2 r 2 )]1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 Where k is the conic coefficient, A4, A6, A8, and A10 are aspherical coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the aspherical curve and the optical axis, and z is the aspherical depth (the perpendicular distance between a point on the aspherical surface at a distance r from the optical axis and a tangent plane at the vertex of the aspherical optical axis). For convenience, the aspherical surfaces of each lens surface use the aspherical surfaces shown in the above formula. However, the present invention is not limited to the aspherical polynomial form expressed by this formula.

[0075] The aspheric coefficient values ​​are shown in Table 6.

[0076] Table 6 Figure 5 The MTF frequency curve for Example 2 shows that at 120 Lp / mm, the MTF > 0.2, indicating high imaging quality.

[0077] Figure 6 The graphs for longitudinal spherical aberration, field curvature, and distortion are shown in Example 2. Figure 6 a is the longitudinal spherical aberration curve. Figure 6 b is the field curvature curve diagram. Figure 6 c represents the distortion curve. Figure 6 It can be seen that the lens in Example 2 has better image quality, field curvature is better compensated, and distortion is well corrected.

[0078] The rest is the same as in Example 1.

[0079] Example 3 like Figure 7-9 As shown, a high-definition large-area short-focal-length lens includes a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially from the object side to the imaging side. The first lens group G1 has negative optical power, the second lens group G2 has positive optical power, and the third lens group G3 has positive optical power.

[0080] The first lens group G1 includes optical elements L11, L12, L13, and L14 arranged sequentially from the object side to the imaging side. Optical element L11 has negative optical power, optical element L12 has negative optical power, optical element L13 has positive optical power, and optical element L14 has negative optical power.

[0081] Optical element L11 has a convex object-side surface and a concave image-side surface. Optical element L12 has negative optical power, and both its object-side and image-side surfaces are concave, which helps to reduce the beam height, reduce system aberrations, and improve image quality. Optical element L13 has a convex object-side surface and a convex image-side surface. Optical element L14 has negative optical power, and its object-side surface is concave while its image-side surface is convex.

[0082] Optical elements L11, L12, and L13 are spherical glass lenses, while optical element L14 is an aspherical glass lens. The use of aspherical lenses not only makes it possible to correct aberrations such as coma and field curvature, but also gives this high-definition, large-aperture, short-focal-length lens a large aperture, a wide field of view, and excellent imaging performance. Compared to plastic, optical glass contains fewer air bubbles and impurities, and has a more uniform refractive index distribution, ensuring high imaging resolution and contrast. The coefficient of thermal expansion of glass is much lower than that of plastic, and it does not absorb moisture from the air, making it suitable for extreme temperature environments (such as automotive lenses). Therefore, this structure allows the lens to achieve high image quality while maintaining a wide imaging temperature range.

[0083] The second lens group G2 includes an optical element L21, which is a glass spherical lens with a convex object side and an convex image side.

[0084] The third lens group G3 includes optical elements L31, L32, L33, L34 and L35 arranged sequentially from the object side to the imaging side.

[0085] The object side and image side of the optical element L31 are both convex.

[0086] The object side and image side of the optical element L32 are both convex.

[0087] The object side of the optical element L33 is convex and the image side is concave.

[0088] The object side and image side of the optical element L34 are both convex.

[0089] The object side of the optical element L35 is convex, and its image side is concave. In this embodiment, the optical parameters of each lens are shown in Table 7.

[0090] Table 7 In this embodiment, the optical design values ​​of the high-definition large-area short-focal-length lens are shown in Table 8.

[0091] Table 8 The aspherical surface in a lens is described by the following formula: z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )]1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 Where k is the conic coefficient, A4, A6, A8, and A10 are aspherical coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the aspherical curve and the optical axis, and z is the aspherical depth (the perpendicular distance between a point on the aspherical surface at a distance r from the optical axis and a tangent plane at the vertex of the aspherical optical axis). For convenience, the aspherical surfaces of each lens surface use the aspherical surfaces shown in the above formula. However, the present invention is not limited to the aspherical polynomial form expressed by this formula.

[0092] The aspherical coefficient values ​​are shown in Table 9.

[0093] Table 9 Figure 8 The MTF frequency curve for Example 3 shows that at 120 Lp / mm, the MTF > 0.3, indicating high imaging quality.

[0094] Figure 9 The graphs for longitudinal spherical aberration, field curvature, and distortion are shown in Example 3. Figure 9 a is the longitudinal spherical aberration curve. Figure 9 b is the field curvature curve diagram. Figure 9 c represents the distortion curve. Figure 9 It can be seen that the lens in Example 3 has better image quality, field curvature is better compensated, and distortion is well corrected.

[0095] The rest is the same as in Example 1.

[0096] Example 4 like Figure 10-12 As shown, a high-definition large-area short-focal-length lens includes a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially from the object side to the imaging side. The first lens group G1 has negative optical power, the second lens group G2 has positive optical power, and the third lens group G3 has positive optical power.

[0097] The first lens group G1 includes optical elements L11, L12 and L13 arranged sequentially from the object side to the imaging side.

[0098] The object side of the optical element L11 is convex, and its image side is concave.

[0099] The object side of the optical element L12 is concave, and the image side is convex.

[0100] The object side of optical element L13 is convex, and the image side is also convex.

[0101] The second lens group G2 includes optical elements L21 arranged sequentially from the object side to the imaging side. The object side of the optical element L21 is concave, and its image side is convex.

[0102] The third lens group G3 includes optical elements L31, L32, L33, L34 and L35 arranged sequentially from the object side to the imaging side.

[0103] Both the object side and the image side of the optical element L31 are convex.

[0104] Both the object side and the image side of the optical element L32 are concave.

[0105] Both the object side and the image side of the optical element L33 are convex.

[0106] Both the object side and the image side of the optical element L34 are convex.

[0107] The object side of the optical element L35 is concave, and the image side is convex.

[0108] In this embodiment, the optical parameters of each lens are shown in Table 10.

[0109] Table 11 In this embodiment, the optical design values ​​of the high-definition large-area short-focal-length lens are shown in Table 12.

[0110] Table 12 The aspherical surface in a lens is described by the following formula: z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )]1 / 2}+A4r 4 Where k is the conic coefficient, A4, A6, A8, and A10 are aspherical coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the aspherical curve and the optical axis, and z is the aspherical depth (the perpendicular distance between a point on the aspherical surface at a distance r from the optical axis and a tangent plane at the vertex of the aspherical optical axis). For convenience, the aspherical surfaces of each lens surface use the aspherical surfaces shown in the above formula. However, the present invention is not limited to the aspherical polynomial form expressed by this formula.

[0111] The aspheric coefficient values ​​are shown in Table 13.

[0112] Table 13 Figure 11 The MTF frequency curve for Example 4 shows that at 120 Lp / mm, the MTF > 0.35, indicating high imaging quality.

[0113] Figure 12 The graph shows the longitudinal spherical aberration, field curvature, and distortion curves for Example 1. Figure 12 a is the longitudinal spherical aberration curve. Figure 12 b is the field curvature curve diagram. Figure 12 c represents the distortion curve. Figure 12 It can be seen that the lens in Example 4 has better image quality, field curvature is better compensated, and distortion is well corrected.

[0114] The rest is the same as in Example 1.

[0115] Example 5 like Figure 13-15 As shown, a high-definition large-area short-focal-length lens includes a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially from the object side to the imaging side. The first lens group G1 has negative optical power, the second lens group G2 has positive optical power, and the third lens group G3 has positive optical power.

[0116] The first lens group G1 includes optical elements L11, L12, L13 and L14 arranged sequentially from the object side to the imaging side.

[0117] The object side of the optical element L11 is convex, and its image side is concave.

[0118] The optical element L12 has negative optical power, and both its object side and image side are concave, which helps to reduce the height of the light aperture, while reducing system aberrations and improving image quality.

[0119] The object side of optical element L13 is convex, and the image side is also convex.

[0120] The optical element L14 has negative optical power, with its object side being concave and its image side being convex.

[0121] Optical elements L11, L12, and L13 are spherical glass lenses, while optical element L14 is a convex aspherical glass lens. The use of aspherical lenses not only makes it possible to correct aberrations such as coma and field curvature, but also gives this high-definition, large-aperture, short-focal-length lens a large aperture, a wide field of view, and excellent imaging performance. Compared to plastic, optical glass contains fewer air bubbles and impurities, and has a more uniform refractive index distribution, ensuring high imaging resolution and contrast. The coefficient of thermal expansion of glass is much lower than that of plastic, and it does not absorb moisture from the air, making it suitable for extreme temperature environments (such as automotive lenses). Therefore, this structure allows the lens to achieve high image quality while maintaining a wide imaging temperature range.

[0122] The second lens group G2 includes optical elements L21 arranged sequentially from the object side to the imaging side. The optical elements L21 are glass spherical lenses with a concave object side and a convex image side.

[0123] The third lens group G3 includes optical elements L31, L32, L33, and L34 arranged sequentially from the object side to the imaging side.

[0124] The object side and the image side of the optical element L31 are both convex.

[0125] The object side of the optical element L32 is convex, and the image side is concave.

[0126] Both the object side and the image side of the optical element L33 are convex.

[0127] The object side of the optical element L34 is concave, and the image side is convex.

[0128] In this embodiment, the optical parameters of each lens are shown in Table 14.

[0129] Table 14 In this embodiment, the optical design values ​​of the high-definition large-area short-focal-length lens are shown in Table 15.

[0130] Table 15 The aspherical surface in a lens is described by the following formula: z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )]1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r 14 Where k is the conic coefficient, A4, A6, A8, A10, A12, and A14 are aspherical coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance from a point on the aspherical curve to the optical axis, and z is the aspherical depth (the perpendicular distance between a point on the aspherical surface at a distance r from the optical axis and a tangent plane at the vertex of the aspherical optical axis). For convenience, the aspherical surfaces of each lens surface use the aspherical surfaces shown in the above formula. However, the present invention is not limited to the aspherical polynomial form expressed by this formula.

[0131] The aspherical coefficient values ​​are shown in Table 16.

[0132] Table 16 Figure 14 The MTF frequency curve for Example 5 shows that at 120 Lp / mm, the MTF ≥ 0.2, indicating high imaging quality.

[0133] Figure 15 The graph shows the longitudinal spherical aberration, field curvature, and distortion curves for Example 1. Figure 15 a is the longitudinal spherical aberration curve. Figure 15 b is the field curvature curve diagram. Figure 15 c represents the distortion curve. Figure 15 It can be seen that the lens in Example 5 has better image quality, field curvature is better compensated, and distortion is well corrected.

[0134] The rest is the same as in Example 1.

[0135] Any parts or structures not specifically described in this invention can be made using existing technologies or products, and will not be elaborated upon here.

[0136] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A high-definition, large-aperture, short-focal-length lens, characterized in that, The high-definition large-area short-focal-length lens comprises a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially from the object side to the imaging side. The first lens group G1 has negative optical power, the second lens group G2 has positive optical power, and the third lens group G3 has positive optical power. The high-definition large-area short-focal-length lens satisfies the following conditions: -15≤F1 / F≤-1; 1≤F2 / F≤6; 1≤F3 / F≤8; 1≤TTL / [D / tan(θ)]≤15; Where F1, F2, and F3 represent the focal lengths of the first lens group G1, the second lens group G2, and the third lens group G3, respectively; F represents the focal length of the high-definition large-area short-focal-length lens; TTL represents the total optical length of the high-definition large-area short-focal-length lens; D represents the maximum effective radius of the first lens group G1 away from the second lens group G2; and θ is the half field of view of the high-definition large-area short-focal-length lens. The first lens group G1 includes at least optical elements L11 and L12 arranged sequentially from the object side to the imaging side, wherein optical element L11 has negative optical power and optical element L12 has negative optical power; The second lens group G2 includes at least an optical element L21, which has positive optical power; The third lens group G3 includes at least optical elements L31, L32 and L33 arranged sequentially from the object side to the imaging side, wherein optical element L31 has positive optical power, optical element L32 has positive optical power and optical element L33 has negative optical power.

2. The high-definition large-area short-focal-length lens according to claim 1, characterized in that, The high-definition, large-area, short-focal-length lens meets the following conditions: 3.2 <IH / EPD<3.6; Wherein, IH is the true image height corresponding to the maximum field of view of the high-definition large-area short-focal-length lens; EPD is the entrance pupil diameter of the high-definition large-area short-focal-length lens.

3. The high-definition large-area short-focal-length lens according to claim 1, characterized in that, The high-definition, large-area, short-focal-length lens meets the following conditions: 5.8 <TTL / F<6.4。 4. A high-definition large-area short-focal-length lens according to claim 1, characterized in that, The high-definition, large-area, short-focal-length lens meets the following conditions: 0.12 <BFL / TTL<0.16; BFL is the thickness from the last element of the third lens group G3 to the center of the image plane.

5. A high-definition large-area short-focal-length lens according to claim 1, characterized in that, The high-definition large-area short-focal-length lens comprises nine or ten lenses.

6. A high-definition large-area short-focal-length lens according to claim 5, characterized in that, The high-definition, large-aperture, short-focal-length lens comprises nine elements: The first lens group G1 includes optical elements L11 and L12 arranged sequentially from the object side to the imaging side; the second lens group G2 includes optical elements L21 and L22 arranged sequentially from the object side to the imaging side; and the third lens group G3 includes optical elements L31, L32, L33, L34, and L35 arranged sequentially from the object side to the imaging side. or, The first lens group G1 includes optical elements L11, L12 and L13 arranged sequentially from the object side to the imaging side; the second lens group G2 includes optical element L21; and the third lens group G3 includes optical elements L31, L32, L33, L34 and L35 arranged sequentially from the object side to the imaging side. or, The first lens group G1 includes optical elements L11, L12, L13 and L14 arranged sequentially from the object side to the imaging side; the second lens group G2 includes optical element L21; and the third lens group G3 includes optical elements L31, L32, L33 and L34 arranged sequentially from the object side to the imaging side.

7. A high-definition large-area short-focal-length lens according to claim 5, characterized in that, The high-definition large-area short-focal-length lens comprises ten elements: The first lens group G1 includes optical elements L11, L12, L13 and L14 arranged sequentially from the object side to the imaging side; the second lens group G2 includes optical elements L21, L22 and L23 arranged sequentially from the object side to the imaging side; and the third lens group G3 includes optical elements L31, L32 and L33 arranged sequentially from the object side to the imaging side. or, The first lens group G1 includes optical elements L11, L12, L13 and L14 arranged sequentially from the object side to the imaging side; the second lens group G2 includes optical element L21; and the third lens group G3 includes optical elements L31, L32, L33, L34 and L35 arranged sequentially from the object side to the imaging side.

8. A high-definition large-area short-focal-length lens according to claim 7, characterized in that, The optical element L13 has negative optical power, the optical element L14 has positive optical power, and the optical element L11 satisfies the following condition: -1.8≤f11 / F≤-1.4; Where f11 represents the focal length of optical element L11.

9. A high-definition large-area short-focal-length lens according to claim 7, characterized in that, The second lens group G2 includes optical elements L21, L22, and L23 arranged sequentially from the object side to the imaging side. Optical element L22 has positive optical power, optical element L23 has negative optical power, and optical element L21 satisfies the following condition: 2.3≤f21 / F≤3.6; Here, f21 represents the focal length of optical element L21.

10. A high-definition large-area short-focal-length lens according to claim 7, characterized in that, The optical elements L31 and L33 respectively satisfy the following conditions: -5≤f31 / F≤3.2; -8≤f33 / F≤5.5; Where f31 and f33 represent the focal lengths of optical elements L31 and L33, respectively.

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