Vehicle-mounted wide-angle lens optical system

Abstract

The utility model relates to a vehicle-mounted wide-angle lens optical system, which comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an image side along an optical axis, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a concave surface or a convex surface, and the image side surface of the fifth lens is a concave surface; and the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface. The utility model has the beneficial effects of being capable of increasing the visual angle, low in distortion, high in pixel, excellent in temperature characteristic and capable of meeting day and night confocal requirements.

Description

Technical Field

[0001] This utility model relates to the field of optical imaging, specifically to an optical system for a vehicle-mounted wide-angle lens. Background Technology

[0002] In recent years, with the increasing popularity of intelligent driving, wide-angle lenses have been increasingly used in various vehicles, playing a vital role in areas such as driving recording, safe driving, in-vehicle and external monitoring, lane departure warning, and pedestrian detection and warning. Consequently, the performance requirements for lenses have become increasingly stringent, specifically in terms of optical characteristics such as low distortion, high resolution, and excellent temperature characteristics. However, due to the large field of view of wide-angle lenses, the distortion of the optical system is generally large, resulting in severe image distortion.

[0003] Furthermore, automobiles are used in harsh outdoor weather conditions, requiring automotive lenses to maintain stable imaging performance under varying temperatures. Moreover, in low-light environments such as at night, most current automotive imaging optical systems suffer from insufficient image brightness, making it difficult to clearly distinguish images and thus failing to meet usage requirements. Utility Model Content

[0004] The purpose of this invention is to provide an optical system for a vehicle-mounted wide-angle lens that can increase the viewing angle, reduce distortion, increase pixel count, have excellent temperature characteristics, and meet the requirements of day and night co-focus.

[0005] An automotive wide-angle lens optical system comprises, from the object side to the image side along the optical axis: a first lens with negative optical power, wherein the object side of the first lens is convex and the image side is concave; a second lens with negative optical power, wherein the object side of the second lens is convex and the image side is concave; a third lens with positive optical power, wherein the object side of the third lens is convex and the image side is concave; a fourth lens with positive optical power, wherein the object side of the fourth lens is convex and the image side is convex; a fifth lens with negative optical power, wherein the object side of the fifth lens is either concave or convex, and the image side is concave; and a sixth lens with positive optical power, wherein the object side of the sixth lens is convex and the image side is convex; wherein the first and fourth lenses are made of low-dispersion glass, and the second, third, fifth, and sixth lenses are all made of low-dispersion plastic.

[0006] By employing an optimized design of the first to sixth lenses, the optical system's full field of view is expanded, enabling wide-angle image capture while maintaining low distortion performance. The system's TV distortion is less than 19%. Furthermore, the hybrid design of glass and plastic materials helps correct temperature drift, ensuring the optical system remains focused within a temperature range of -40℃ to 80℃, avoiding the risk of defocusing in harsh environments. This also facilitates further weight reduction and miniaturization. Simultaneously, the use of low-dispersion materials effectively reduces chromatic aberration, enabling the system to achieve day and night co-focusing and providing excellent day and night performance, thus expanding the lens's application range.

[0007] Furthermore, the vehicle-mounted wide-angle lens optical system satisfies the following conditions: -4.0 < f1 / f < -3.0, -3.3 < f2 / f < -2.3, 3.6 < f3 / f < 4.8, 1.5 < f4 / f < 2.5, -2.6 < f5 / f < -1.5, 1.0 < f6 / f < 2.0, where f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f is the focal length of the vehicle-mounted wide-angle lens, and f is the focal length of the vehicle-mounted wide-angle lens optical system.

[0008] In the above scheme, the first, second, and third lenses form the front group, and the fourth, fifth, and sixth lenses form the rear group. The optical power of each lens has a reasonable distribution ratio. The first and second lenses in the front group work together to reduce the angle between the light beam and the optical axis after passing through the front group lenses, quickly lower the light beam height, and allow it to enter the third lens at a reasonable height. This prepares the rear group for further aberration correction and improves the lens's resolution. At the same time, it helps to increase the field of view and achieve wide-angle imaging.

[0009] Furthermore, the vehicle-mounted wide-angle lens optical system satisfies the following conditions: 1.5≤Nd1≤1.7, 50≤Vd1≤70; 1.5≤Nd2≤1.6, 50≤Vd2≤60; 1.6≤Nd3≤1.7, 20≤Vd3≤25; 1.5≤Nd4≤1.7, 60≤Vd4≤80; 1.6≤Nd5≤1.7, 20≤Vd5≤25; 1.5≤Nd6≤1.7, 50≤Vd6≤60.

[0010] Wherein, Nd1 is the refractive index of the first lens, Vd1 is the dispersion coefficient of the first lens, Nd2 is the refractive index of the second lens, Vd2 is the dispersion coefficient of the second lens, Nd3 is the refractive index of the third lens, Vd3 is the dispersion coefficient of the third lens, Nd4 is the refractive index of the fourth lens, Vd4 is the dispersion coefficient of the fourth lens, Nd5 is the refractive index of the fifth lens, Vd5 is the dispersion coefficient of the fifth lens, Nd6 is the refractive index of the sixth lens, and Vd6 is the dispersion coefficient of the sixth lens.

[0011] In the above scheme, the lens combination structure that satisfies the aforementioned refractive index relationship is conducive to achieving a reasonable distribution of optical power, and can better correct aberrations such as spherical aberration and field curvature, thereby improving lens resolution. Furthermore, the fourth lens uses an ultra-low dispersion material, which can effectively reduce the axial chromatic aberration of the system, giving the system better infrared imaging performance and preventing defocusing in both day and night.

[0012] Furthermore, the vehicle-mounted wide-angle lens optical system satisfies the following condition: -8×10 -6 ≤dn / dt (L4) ≤-3×10 -6 , where dn / dt (L4) The relative refractive index temperature coefficient of the fourth lens.

[0013] In the above scheme, the fourth lens that satisfies the above relationship is beneficial to the temperature correction of the calorimetric system and can more effectively balance the image plane drift of the optical system under high and low temperature conditions.

[0014] Furthermore, the first lens and the fourth lens are spherical lenses, while the second lens, the third lens, the fifth lens, and the sixth lens are all aspherical lenses.

[0015] In the above scheme, the second, third, fifth, and sixth lenses are all aspherical lenses. Due to the greater degree of freedom in the shape of aspherical surfaces, their ability to correct light refraction and aberrations is significantly stronger than that of spherical surfaces, which is beneficial for improving lens resolution and correcting lens distortion. At the same time, it is also beneficial for correcting the exit light angle of the lens, and can better match the image sensor.

[0016] Furthermore, the vehicle-mounted wide-angle lens optical system satisfies the following condition: D12 / R12<1.84, where D12 is the effective aperture of the image-side surface of the first lens, and R12 is the radius of curvature of the image-side surface of the first lens.

[0017] In the above scheme, by making the first lens satisfy the above condition, the lens structure of the vehicle-mounted wide-angle lens can be made simple and compact, and the lens of the wide-angle lens can be guaranteed to have good optical performance and processing performance.

[0018] Furthermore, the on-vehicle wide-angle lens optical system satisfies the following conditional formula: 0.1 < f / TTL < 0.25, where f is the focal length of the on-vehicle wide-angle lens optical system, and TTL is the axial distance from the object side surface of the first lens to the imaging surface.

[0019] In the above solution, the focal length of the on-vehicle wide-angle lens optical system and the axial distance from the object side surface of the first lens to the imaging surface satisfy the above relational formula, which can enable the optical system to maintain a high imaging quality while effectively shortening the total system length.

[0020] Furthermore, the on-vehicle wide-angle lens optical system satisfies the following conditional formula: 0.15 < BFL / TTL < 0.25, where BFL is the axial distance from the image side surface of the sixth lens to the imaging surface, and TTL is the axial distance from the object side surface of the first lens to the imaging surface.

[0021] In the above solution, by making the optical system satisfy the above conditional formula, it is beneficial to ensure the optical performance of the system while restricting the total optical length of the system.

[0022] Furthermore, the on-vehicle wide-angle lens optical system satisfies the following conditional formula: DFOV > 115°, where DFOV is the full field angle of the on-vehicle wide-angle lens optical system.

[0023] In the above solution, through the optimized design of the first lens, the second lens, the third lens, and the fourth lens, the full field angle of the optical system can reach more than 115°, and the TV distortion of the system is lower than 19%. This optical system can achieve a large full field angle while maintaining a small overall size, and can also take into account the low distortion performance.

[0024] Furthermore, it further includes an aperture, and the aperture is disposed between the first lens and the second lens.

[0025] In the above solution, by disposing the aperture between the first lens and the second lens, through such a setting, it is beneficial to increase the field angle of the wide-angle lens optical system, and can also better balance the exit angle of the optical system, thereby being beneficial to matching the corresponding image sensor, and can also ensure improving the imaging quality while satisfying a short system length.

[0026] This invention discloses an optical system for a vehicle-mounted wide-angle lens, which offers advantages such as increased viewing angle, low distortion, excellent temperature characteristics, and day / night confocal focus. Through optimized design of the first to sixth lenses, the system's full field of view is expanded, enabling wide-angle image capture while maintaining low distortion performance. The system's TV distortion is less than 19%. Furthermore, the use of a hybrid design of glass and plastic materials helps correct temperature drift, ensuring the optical system remains focused within a temperature range of -40℃ to 80℃, avoiding the risk of focus loss in harsh environments. This also facilitates further weight reduction and miniaturization of the lens. Simultaneously, the use of low-dispersion materials effectively reduces chromatic aberration, enabling the system to achieve day / night confocal focus and providing excellent day / night performance, thus expanding the lens's application range. Attached Figure Description

[0027] Figure 1 This is a structural diagram of the vehicle-mounted wide-angle lens 1 in Example 1.

[0028] Figure 2 This is a field curvature distortion diagram of the vehicle-mounted wide-angle lens 1 in Example 1.

[0029] Figure 3 The image shows the defocus MTF curve of the vehicle-mounted wide-angle lens 1 in Example 1 at a normal temperature of 20°C.

[0030] Figure 4 The image shows the defocus MTF curve of the vehicle-mounted wide-angle lens 1 in Example 1 at a low temperature of -40℃.

[0031] Figure 5 The image shows the defocus MTF curve of the vehicle-mounted wide-angle lens 1 in Example 1 at a high temperature of 80°C.

[0032] Figure 6 This is the infrared defocus MTF curve of the vehicle-mounted wide-angle lens 1 in Example 1.

[0033] Figure 7 This is a structural diagram of the vehicle-mounted wide-angle lens 2 in Example 2.

[0034] Figure 8 This is a field curvature distortion diagram of the vehicle-mounted wide-angle lens 2 in Example 2.

[0035] Figure 9 The image shows the defocus MTF curve of the vehicle-mounted wide-angle lens 2 in Example 2 at a normal temperature of 20°C.

[0036] Figure 10 The image shows the defocus MTF curve of the vehicle-mounted wide-angle lens 2 in Example 2 at a low temperature of -40℃.

[0037] Figure 11This is the defocus MTF curve of the vehicle-mounted wide-angle lens 2 in Example 2 at a high temperature of 80°C.

[0038] Figure 12 This is the infrared defocus MTF curve of the vehicle-mounted wide-angle lens 2 in Example 2.

[0039] Figure 13 This is a structural diagram of the vehicle-mounted wide-angle lens 3 in Example 3.

[0040] Figure 14 This is a field curvature distortion diagram of the vehicle-mounted wide-angle lens 3 in Example 3.

[0041] Figure 15 The image shows the defocus MTF curve of the vehicle-mounted wide-angle lens 3 in Example 3 at a normal temperature of 20°C.

[0042] Figure 16 The image shows the defocus MTF curve of the vehicle-mounted wide-angle lens 3 in Example 3 at a low temperature of -40℃.

[0043] Figure 17 This is the defocus MTF curve of the vehicle-mounted wide-angle lens 3 in Example 3 at a high temperature of 80°C.

[0044] Figure 18 This is the infrared defocus MTF curve of the vehicle-mounted wide-angle lens 3 in Example 3.

[0045] Figure 19 This is a structural diagram of the vehicle-mounted wide-angle lens 4 in Example 4.

[0046] Figure 20 This is a field curvature distortion diagram of the vehicle-mounted wide-angle lens 4 in Example 4.

[0047] Figure 21 The image shows the defocus MTF curve of the vehicle-mounted wide-angle lens 4 in Example 4 at a normal temperature of 20°C.

[0048] Figure 22 The image shows the defocus MTF curve of the vehicle-mounted wide-angle lens 4 in Example 4 at a low temperature of -40℃.

[0049] Figure 23 This is the defocus MTF curve of the vehicle-mounted wide-angle lens 4 in Example 4 at a high temperature of 80°C.

[0050] Figure 24 This is the infrared defocus MTF curve of the vehicle-mounted wide-angle lens 4 in Example 4.

[0051] Explanation of the reference numerals: L1, first lens; L2, second lens; L3, third lens; L4, fourth lens; L5, fifth lens; L6, sixth lens; STO, aperture stop; BPF, bandpass filter; IMA, imaging plane. Detailed Implementation

[0052] To facilitate understanding of this invention, a more comprehensive description will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the invention. However, this invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0053] The vehicle-mounted wide-angle lens optical system described in this embodiment consists of six lenses. It has a simple structure and small size. By combining lenses with different structures and rationally allocating the optical power of each lens, it can ensure a sufficient field of view and has excellent temperature characteristics, making it particularly suitable for vehicle-mounted monitoring systems.

[0054] The basic structure of the vehicle-mounted wide-angle lens optical system involved in this embodiment will be described.

[0055] like Figures 1 to 24 As shown, in a preferred embodiment, an automotive wide-angle lens optical system comprises, from the object side to the image side along the optical axis, the following components in sequence: a first lens L1 with negative optical power, wherein the object side of the first lens L1 is convex and the image side is concave; a second lens L2 with negative optical power, wherein the object side of the second lens L2 is convex and the image side is concave; a third lens L3 with positive optical power, wherein the object side of the third lens L3 is convex and the image side is concave; a fourth lens L4 with positive optical power, wherein the object side of the fourth lens L4 is convex and the image side is convex; a fifth lens L5 with negative optical power, wherein the object side of the fifth lens L5 is either concave or convex, and the image side is concave; and a sixth lens L6 with positive optical power, wherein the object side of the sixth lens L6 is convex and the image side is convex; the first lens L1 and the fourth lens L4 are made of low-dispersion glass material, and the second lens L2, the third lens L3, the fifth lens L5 and the sixth lens L6 are all made of low-dispersion plastic material.

[0056] By employing an optimized design of the first lens L1 to the sixth lens L6, the full field of view of the optical system can be expanded, enabling wide-angle image capture while maintaining low distortion performance. The system's TV distortion is less than 19%. Furthermore, the use of a hybrid design of glass and plastic materials helps correct temperature drift, ensuring the optical system remains focused within a temperature range of -40℃ to 80℃, avoiding the risk of defocusing in harsh environments. This also helps to further reduce the lens's weight and facilitates lens miniaturization. Simultaneously, the use of low-dispersion materials effectively reduces chromatic aberration, enabling the system to achieve day and night co-focusing and providing excellent day and night performance, thus expanding the lens's application range.

[0057] In addition, the use of more plastic lenses helps to further reduce the weight of the lens and makes it easier to miniaturize the lens.

[0058] As shown in the figure, in some embodiments, the vehicle-mounted wide-angle lens optical system satisfies the following conditions: -4.0 < f1 / f < -3.0, -3.3 < f2 / f < -2.3, 3.6 < f3 / f < 4.8, 1.5 < f4 / f < 2.5, -2.6 < f5 / f < -1.5, 1.0 < f6 / f < 2.0, where f1 is the focal length of the first lens L1, f2 is the focal length of the second lens L2, f3 is the focal length of the third lens L3, f4 is the focal length of the fourth lens L4, f5 is the focal length of the fifth lens L5, f6 is the focal length of the sixth lens L6, f is the focal length of the vehicle-mounted wide-angle lens, and f is the focal length of the vehicle-mounted wide-angle lens optical system. The first lens L1, the second lens L2, and the third lens L3 form the front group, while the fourth lens L4, the fifth lens L5, and the sixth lens L6 form the rear group. The optical power of each lens has a reasonable distribution ratio. The first lens L1 and the second lens L2 in the front group work together to reduce the angle between the light beam and the optical axis after passing through the front group lenses, quickly lowering the light beam height so that it enters the third lens L3 at a reasonable height. This prepares the rear group for further aberration correction and improves the lens's resolution. At the same time, it helps to increase the field of view and achieve wide-angle imaging.

[0059] like Figures 1 to 24 As shown, in some embodiments, the vehicle-mounted wide-angle lens optical system satisfies the following conditions: 1.5≤Nd1≤1.7, 50≤Vd1≤70; 1.5≤Nd2≤1.6, 50≤Vd2≤60; 1.6≤Nd3≤1.7, 20≤Vd3≤25; 1.5≤Nd4≤1.7, 60≤Vd4≤80; 1.6≤Nd5≤1.7, 20≤Vd5≤25; 1.5≤Nd6≤1.7, 50≤Vd6≤60; where Nd1 is the first lens L1. Refractive index, Vd1 is the dispersion coefficient of the first lens L1, Nd2 is the refractive index of the second lens L2, Vd2 is the dispersion coefficient of the second lens L2, Nd3 is the refractive index of the third lens L3, Vd3 is the dispersion coefficient of the third lens L3, Nd4 is the refractive index of the fourth lens L4, Vd4 is the dispersion coefficient of the fourth lens L4, Nd5 is the refractive index of the fifth lens L5, Vd5 is the dispersion coefficient of the fifth lens L5, Nd6 is the refractive index of the sixth lens L6, Vd6 is the dispersion coefficient of the sixth lens L6.

[0060] The lens combination structure that satisfies the above refractive index relationship is conducive to achieving a reasonable distribution of optical power, and can better correct aberrations such as spherical aberration and field curvature, thereby improving lens resolution. Furthermore, the fourth lens L4 uses an ultra-low dispersion material, which can effectively reduce the axial chromatic aberration of the system, giving the system better infrared imaging performance and preventing defocusing in both day and night.

[0061] like Figures 1 to 24As shown, in some embodiments, the on-vehicle wide-angle lens optical system satisfies the following conditional formula: -8×10 -6 ≤dn / dt (L4) ≤ -3×10 -6 , where dn / dt (L4) is the relative refractive index temperature coefficient of the fourth lens L4. The fourth lens L4 that satisfies the above relational expression is beneficial to the temperature correction of the athermalization system and can more effectively balance the image plane drift amount of the optical system in high and low temperature states.

[0062] As Figures 1 to 24 shown, in some embodiments, the first lens L1 and the fourth lens L4 are spherical lenses, and the second lens L2, the third lens L3, the fifth lens L5, and the sixth lens L6 are all aspherical lenses. The second lens L2, the third lens L3, the fifth lens L5, and the sixth lens L6 are all aspherical lenses. Due to the large degree of freedom of the aspherical surface type, the deflection of light and the correction ability of aberration are significantly stronger than those of the spherical surface, which is beneficial to improving the lens resolution and correcting lens distortion. At the same time, it is also beneficial to correct the exit light angle of the lens and better match the photosensitive element.

[0063] As Figures 1 to 24 shown, in some embodiments, the on-vehicle wide-angle lens optical system satisfies the following conditional formula: D12 / R12 < 1.84, where D12 is the effective aperture of the image side of the first lens L1, and R12 is the curvature radius of the image side of the first lens L1. By making the first lens L1 satisfy the above conditional formula, the lens structure of the on-vehicle wide-angle lens can be made simple and compact, and the lens of the wide-angle lens can be ensured to have good optical performance and processing performance.

[0064] As Figures 1 to 24 shown, in some embodiments, the on-vehicle wide-angle lens optical system satisfies the following conditional formula: 0.1 < f / TTL < 0.25, where f is the focal length of the on-vehicle wide-angle lens optical system, and TTL is the axial distance from the object side of the first lens L1 to the imaging plane. When the focal length of the on-vehicle wide-angle lens optical system and the axial distance from the object side of the first lens L1 to the imaging plane satisfy the above relational expression, the optical system can maintain a high imaging quality while effectively shortening the total length of the system.

[0065] As Figures 1 to 24 shown, in some embodiments, the on-vehicle wide-angle lens optical system satisfies the following conditional formula: 0.15 < BFL / TTL < 0.25, where BFL is the axial distance from the image side of the sixth lens L6 to the imaging plane, and TTL is the axial distance from the object side of the first lens L1 to the imaging plane. By making the optical system satisfy the above conditional formula, it is beneficial to ensure the optical performance of the system while restricting the total optical length of the system.

[0066] As Figures 1 to 24 As shown, in some embodiments, the automotive wide-angle lens optical system satisfies the following condition: DFOV > 115°, where DFOV is the full field of view of the automotive wide-angle lens optical system. Through optimized design of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4, the full field of view of the optical system can reach more than 115°, while the TV distortion of the system is less than 19%. This optical system can achieve a large full field of view while maintaining a compact overall size, and can also take into account low distortion performance.

[0067] like Figures 1 to 24 As shown, in some embodiments, an aperture stop is also included, positioned between the first lens L1 and the second lens L2. This arrangement between the first lens L1 and the second lens L2 helps to increase the field of view of the wide-angle lens optical system while better balancing the exit angle of the optical system. This facilitates matching with the corresponding image sensor and ensures improved image quality while maintaining a short system length. The aperture can be FNO ≤ 2.3, resulting in a large amount of light entering the lens and high image brightness.

[0068] In some embodiments, the automotive wide-angle lens optical system satisfies the following condition: TTL < 12.6 mm, where TTL is the on-axis distance from the object-side surface of the first lens L1 to the imaging surface. Besides ensuring f / TTL is greater than 0.1 and less than 0.25, it is also necessary to ensure that TTL, i.e., the on-axis distance from the object-side surface of the first lens L1 to the imaging surface, is less than 12.6 mm. This helps to ensure the optical performance of the system while limiting its overall optical length.

[0069] This utility model discloses an optical system for a vehicle-mounted wide-angle lens. By adopting the optimized design of the first lens L1 to the sixth lens L6, the horizontal field of view can reach more than 115°, realizing image capture at a wide angle, and the maximum image plane diameter can reach 6.8mm. At the same time, it takes into account low distortion performance, with TV distortion of less than 9%, small image deformation, and more realistic imaging.

[0070] By making extensive use of aspherical surfaces, the system aberrations are well corrected, enabling high-definition imaging of 5 megapixels. Furthermore, the total length of the optical system is less than 15.2mm, making it compact and facilitating lens miniaturization.

[0071] The hybrid design using glass and plastic materials helps correct temperature drift, ensuring the optical system remains focused within a temperature range of -40℃ to 80℃, thus avoiding the risk of focus loss when shooting in harsh environments. Simultaneously, the use of low-dispersion materials effectively reduces chromatic aberration, enabling the system to achieve confocal focus day and night, providing excellent day and night performance and expanding the lens's versatility.

[0072] In various embodiments of this utility model, when the lens adopts an aspherical surface shape, the aspherical surface shapes of the optical lens satisfy the following relationship:

[0073]

[0074] In the formula, Z is the distance between the surface and the surface vertex in the optical axis direction, parameter c is the curvature corresponding to the lens radius, y is the radial coordinate, k is the conic quadratic curve coefficient, and a4, a6, a8, a10, a12, a14, and a16 are the surface coefficients corresponding to the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order radial coordinates, respectively.

[0075] Below, examples of automotive wide-angle lenses are provided, along with detailed descriptions in conjunction with accompanying drawings.

[0076] Example 1

[0077] The design parameters of the vehicle-mounted wide-angle lens optical system in this embodiment can be shown in the table below:

[0078] Table 1-1

[0079]

[0080]

[0081] In the table above, the units for surface radius and thickness are millimeters; surfaces marked with "*" indicate aspherical surfaces, and the surface shape of aspherical lenses satisfies the following relationship:

[0082] The aspherical surface parameters of the vehicle-mounted wide-angle lens 1 in this embodiment are shown in Table 1-2:

[0083] Table 1-2:

[0084]

[0085]

[0086] Figure 2 This is a field curvature distortion diagram of the vehicle-mounted wide-angle lens 1 in this embodiment. Figure 3 , Figure 4 , Figure 5 The graphs show the defocus MTF curves of the vehicle-mounted wide-angle lens 1 in this embodiment at room temperature (20°C), low temperature (-40°C), and high temperature (80°C). Figure 6 This is the infrared defocus MTF curve of the vehicle-mounted wide-angle lens 1 in this embodiment.

[0087] from Figure 2 As can be seen, the field of view reaches 129° and the optical distortion is controlled within -20%, indicating that the distortion of the vehicle-mounted wide-angle lens 1 is well corrected and the image distortion is small.

[0088] from Figures 3-5 As can be seen, the temperature drift is small within the temperature range of -40℃ to 80℃, indicating that the vehicle-mounted wide-angle lens 1 performs well in harsh environments with low and high temperatures.

[0089] from Figure 6 As can be seen, the infrared defocus is small, indicating that the vehicle-mounted wide-angle lens 1 has excellent day and night dual-use performance, and is not out of focus during the day or at night.

[0090] Example 2

[0091] Figure 7 This is a structural diagram of the vehicle-mounted wide-angle lens 2 in this embodiment. The main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0092] In this embodiment, the horizontal field of view (HFOV) of the vehicle-mounted wide-angle lens 2 is 118.3°, and the field of view (FNO) is 2.3°.

[0093] The relevant parameters of each lens in the vehicle-mounted wide-angle lens 1 in this embodiment are shown in Table 2-1.

[0094] Table 2-1

[0095]

[0096]

[0097] In Table 2-1, the surfaces marked with "*" represent aspherical surfaces.

[0098] The aspherical surface parameters of the vehicle-mounted wide-angle lens 2 in this embodiment are shown in Table 2-2.

[0099] Table 2-2

[0100]

[0101] Figure 8 This is a field curvature distortion diagram of the vehicle-mounted wide-angle lens 2 in this embodiment. Figure 9 , Figure 10 , Figure 11 The graphs show the defocus MTF curves of the vehicle-mounted wide-angle lens 2 in this embodiment at room temperature (20°C), low temperature (-40°C), and high temperature (80°C). Figure 12 This is the infrared defocus MTF curve of the vehicle-mounted wide-angle lens 2 in this embodiment.

[0102] from Figure 8 As can be seen, the field of view reaches 129.1° and the optical distortion is controlled within -20%, indicating that the distortion of the vehicle-mounted wide-angle lens 2 is well corrected and the image distortion is small.

[0103] from Figures 9-11 As can be seen, the temperature drift is small within the temperature range of -40℃ to 80℃, indicating that the vehicle-mounted wide-angle lens 2 performs well in harsh environments with low and high temperatures.

[0104] from Figure 12 As can be seen, the infrared defocus is small, indicating that the vehicle-mounted wide-angle lens 2 has excellent day and night performance, and is not out of focus during the day or at night.

[0105] Example 3

[0106] Figure 13 This is a structural diagram of the vehicle-mounted wide-angle lens 3 in this embodiment. The main difference between this embodiment and the first embodiment is that the object side of the fifth lens L5 is convex and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0107] In this embodiment, the horizontal field of view (HFOV) of the vehicle-mounted wide-angle lens 3 is 119°, and the field of view (FNO) is 2.3.

[0108] The relevant parameters of each lens in the vehicle-mounted wide-angle lens 3 in this embodiment are shown in Table 3-1.

[0109] Table 3-1

[0110]

[0111] In Table 3-1, the surfaces marked with "*" represent aspherical surfaces.

[0112] The aspherical surface parameters of the vehicle-mounted wide-angle lens 3 in this embodiment are shown in Table 3-2.

[0113] Table 3-2

[0114]

[0115] Figure 14 This is a field curvature distortion diagram of the vehicle-mounted wide-angle lens 3 in this embodiment. Figure 15 , Figure 16 , Figure 17 The graphs show the defocus MTF curves of the vehicle-mounted wide-angle lens 3 in this embodiment at room temperature (20°C), low temperature (-40°C), and high temperature (80°C). Figure 18 This is the infrared defocus MTF curve of the vehicle-mounted wide-angle lens 3 in this embodiment.

[0116] from Figure 14 As can be seen, the field of view reaches 129° and the optical distortion is controlled within -20%, indicating that the distortion of the vehicle-mounted wide-angle lens 3 is well corrected and the image distortion is small.

[0117] from Figures 15-17As can be seen, the temperature drift is small within the temperature range of -40℃ to 80℃, indicating that the vehicle-mounted wide-angle lens 3 performs well in harsh environments with low and high temperatures.

[0118] from Figure 18 As can be seen, the infrared defocus is small, indicating that the vehicle-mounted wide-angle lens 3 has excellent day and night dual-use performance, and is not out of focus during the day or at night.

[0119] Example 4

[0120] Figure 19 This is a structural diagram of the vehicle-mounted wide-angle lens 4 in this embodiment. The main difference between this embodiment and the first embodiment is that the object side of the fifth lens L5 is convex and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0121] In this embodiment, the horizontal field of view (HFOV) of the vehicle-mounted wide-angle lens 4 is 118.9°, and the field of view (FNO) is 2.3.

[0122] The relevant parameters of each lens in the vehicle-mounted wide-angle lens 4 in this embodiment are shown in Table 4-1.

[0123] Table 4-1

[0124]

[0125]

[0126] In Table 4-1, the surfaces marked with "*" represent aspherical surfaces.

[0127] The aspherical surface parameters of the vehicle-mounted wide-angle lens 4 in this embodiment are shown in Table 4-2. Table 4-1

[0128]

[0129]

[0130] Figure 20 This is a field curvature distortion diagram of the vehicle-mounted wide-angle lens 4 in this embodiment. Figure 21 , Figure 22 , Figure 23 The graphs show the defocus MTF curves of the vehicle-mounted wide-angle lens 4 in this embodiment at room temperature (20°C), low temperature (-40°C), and high temperature (80°C). Figure 24 This is the infrared defocus MTF curve of the vehicle-mounted wide-angle lens 4 in this embodiment.

[0131] from Figure 20 As can be seen, the field of view reaches 129° and the optical distortion is controlled within -20%, indicating that the distortion of the vehicle-mounted wide-angle lens 4 is well corrected and the image distortion is small.

[0132] from Figures 21-23 As can be seen, the temperature drift is small within the temperature range of -40℃ to 80℃, indicating that the vehicle-mounted wide-angle lens 4 performs well in harsh environments with low and high temperatures.

[0133] from Figure 24 As can be seen, the infrared defocus is small, indicating that the vehicle-mounted wide-angle lens 4 has excellent day and night performance, and is not out of focus during the day or at night.

[0134] Referring to Table 5, the optical characteristics corresponding to each of the above embodiments are shown, including the effective focal length f of the optical lens, the total optical length TTL, the relative refractive index temperature coefficient dn / dt(L4) of the fourth lens, and the values ​​corresponding to each conditional expression in the embodiments.

[0135] Table 5

[0136]

[0137]

[0138] In summary, the vehicle-mounted wide-angle lens provided by this utility model achieves the effects of large field of view, low distortion, high pixel count, short overall length, low temperature drift, and infrared confocality by reasonably matching the surface shape and optical power combination of each lens and selecting appropriate lens materials.

[0139] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0140] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0141] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; 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 utility model according to the specific circumstances.

[0142] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A vehicle-mounted wide-angle lens optical system characterized by comprising: From the object side to the image side along the optical axis in order comprises: a first lens with negative focal power, the object side of the first lens is convex, the image side is concave; a second lens with negative focal power, the object side of the second lens is convex, the image side is concave; a third lens with positive focal power, the object side of the third lens is convex, the image side is concave; a fourth lens with positive focal power, the object side of the fourth lens is convex, the image side is convex; a fifth lens with negative focal power, the object side of the fifth lens is concave or convex, the image side is concave; a sixth lens with positive focal power, the object side of the sixth lens is convex, the image side is convex; The first lens and the fourth lens are made of low dispersion glass material, and the second lens, the third lens, the fifth lens and the sixth lens are made of low dispersion plastic material.

2. The on-vehicle wide-angle lens optical system according to claim 1, characterized by The vehicle-mounted wide-angle lens optical system satisfies the following conditional expressions: -4.0 -3.3 3.6 1.5 -2.6 1.0 Wherein, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f is the focal length of the vehicle-mounted wide-angle lens, and f is the focal length of the vehicle-mounted wide-angle lens optical system.

3. The on-vehicle wide-angle lens optical system according to claim 1, characterized by The vehicle-mounted wide-angle lens optical system satisfies the following conditional expressions: 1.5Nd1 1.5Nd2 1.6Nd3 1.5Nd4 1.6Nd5 1.5Nd6 Wherein, Nd1 is the refractive index of the first lens, Vd1 is the dispersion coefficient of the first lens, Nd2 is the refractive index of the second lens, Vd2 is the dispersion coefficient of the second lens, Nd3 is the refractive index of the third lens, Vd3 is the dispersion coefficient of the third lens, Nd4 is the refractive index of the fourth lens, Vd4 is the dispersion coefficient of the fourth lens, Nd5 is the refractive index of the fifth lens, Vd5 is the dispersion coefficient of the fifth lens, Nd6 is the refractive index of the sixth lens, and Vd6 is the dispersion coefficient of the sixth lens.

4. The on-vehicle wide-angle lens optical system according to claim 1, characterized by The vehicle-mounted wide-angle lens optical system satisfies the following conditional expression: -8x10 -6 ≤ dn / dt (L4) ≤ -3x10 -6 wherein dn / dt (L4) is a relative refractive index temperature coefficient of the fourth lens.

5. The on-vehicle wide-angle lens optical system according to claim 1, characterized by The first lens and the fourth lens are spherical lenses, and the second lens, the third lens, the fifth lens and the sixth lens are aspherical lenses.

6. The on-vehicle wide-angle lens optical system according to claim 1, characterized by The vehicle-mounted wide-angle lens optical system satisfies the following conditional expression: D12 / R12<1.84, wherein D12 is the effective aperture of the image side of the first lens, and R12 is the curvature radius of the image side of the first lens.

7. The on-vehicle wide-angle lens optical system according to claim 1, characterized by The vehicle-mounted wide-angle lens optical system satisfies the following conditional expression: 0.1 < f / TTL < 0.15, wherein f is a focal length of the vehicle-mounted wide-angle lens optical system, and TTL is an on-axis distance from an object side surface of the first lens to an image plane.

8. The on-vehicle wide-angle lens optical system according to claim 7, characterized by The vehicle-mounted wide-angle lens optical system satisfies the following conditional expression: 0.15 < BFL / TTL < 0.25, wherein BFL is an on-axis distance from an image side surface of the sixth lens to the image plane, and TTL is the on-axis distance from the object side surface of the first lens to the image plane.

9. The on-vehicle wide-angle lens optical system according to claim 1, characterized by, The vehicle-mounted wide-angle lens optical system satisfies the following conditional expression: DFOV > 115°, wherein DFOV is a full field of view angle of the vehicle-mounted wide-angle lens optical system.

10. The on-vehicle wide-angle lens optical system according to claim 1, characterized by, A diaphragm is arranged between the third lens and the fourth lens.

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