An ultra-wide-angle optical lens

Abstract

The application discloses an ultra-wide-angle optical lens, comprising an optical lens group, the optical lens group has an optical axis, the optical lens group is sequentially provided with a first lens, a second lens, a third lens, a fourth lens and a fifth lens along the optical axis from an object side to an image side, an aperture is arranged between the third lens and the fourth lens, the first lens, the second lens and the fourth lens have negative refractive power, the third lens and the fifth lens have positive refractive power; the optical lens group satisfies the following relationship: |F2*F3 / F1|>=1.45; IH / EFL>=1.9; FOV / (D*TTL)>=1.2; wherein, F1, F2, F3 are effective focal lengths of the first lens, the second lens and the third lens respectively, IH is the maximum image height of the optical lens group, EFL is the equivalent focal length of the optical lens group, FOV is the maximum field of view angle of the optical lens group, D is the head aperture size of the optical lens group, and TTL is the total optical length of the optical lens group. The application realizes an ultra-wide-angle field of view of 220 degrees, and meanwhile ensures the miniaturization of the optical lens and the imaging quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical lenses, in particular to an ultra-wide-angle optical lens. BACKGROUND

[0002] In recent years, the automobile industry has developed rapidly, and people have gradually put forward the concept of assisted driving and automatic driving. The vehicle-mounted camera has become an indispensable part of automobile parts, and the vehicle-mounted lens as the core part of the vehicle-mounted camera plays a very important role, especially the wide-angle lens in the vehicle-mounted lens. This lens is often used in automobile blind area monitoring and 360° real-time imaging without dead angle. With the popularization of the adaptation of such vehicle-mounted wide-angle lenses, people's requirements for such lenses are also getting higher and higher. At the same time, with the complication of the car system, the installation space of the vehicle-mounted lens is being compressed smaller and smaller. In order to meet the demand of miniaturization of the lens, the conventional vehicle-mounted wide-angle lens on the market generally makes sacrifices in imaging quality, field of view and cost.

[0003] The conventional vehicle-mounted wide-angle lens on the market usually reduces image quality, reduces field of view or increases material cost to realize the demand of miniaturization of the lens. Therefore, how to realize the design of ultra-wide-angle and compact structure under the premise of ensuring high imaging quality has become an important problem faced by the current optical lens field. SUMMARY

[0004] In order to solve the phenomenon that the conventional vehicle-mounted wide-angle lens cannot meet the requirements of miniaturization and clear imaging, the present application provides an ultra-wide-angle optical lens, which realizes the design requirements of ultra-wide-angle, high imaging quality and compact structure.

[0005] An ultra-wide-angle optical lens, comprising an optical lens group, the optical lens group has an optical axis, the optical lens group is sequentially provided with a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along the optical axis, an optical stop is arranged between the third lens and the fourth lens, the first lens, the second lens and the fourth lens have negative refractive power, and the third lens and the fifth lens have positive refractive power.

[0006] The optical lens group satisfies the following relationship:

[0007] F2*F3 / F1|≥1.45;

[0008] IH / EFL≥1.9;

[0009] FOV / (D*TTL)≥1.2;

[0010] Wherein, F1, F2, F3 are effective focal lengths of the first lens, the second lens and the third lens respectively, IH is a maximum image height of the optical lens group, EFL is an equivalent focal length of the optical lens group, FOV is a maximum field of view angle of the optical lens group, D is a head aperture size of the optical lens group, and TTL is an optical total length of the optical lens group.

[0011] By adopting the technical scheme, the ratio between the image height and the effective focal length is set, and the 220° super wide angle of the lens is realized. By reasonably distributing the refractive power of the first lens, the second lens and the third lens, the requirement of clear imaging of the 220° super wide angle is realized, so that the lens can realize the super wide angle while obtaining good clarity. At the same time, by controlling the relationship between the maximum field of view angle, the head aperture size and the optical total length, the miniaturization of the optical lens group is realized. Through theoretical calculation and analysis of the reflection and refraction optical system, the initial configuration of the optical system is determined, and the problem of low imaging quality is effectively improved.

[0012] Preferably, the optical lens group further satisfies the following relationship: FOV / 2 / α4≥1.8; wherein, α4 is an included angle between a tangent of an arc length of a maximum light passing aperture of the fourth surface and the optical axis.

[0013] By adopting the technical scheme, the surface angle of the second lens towards the image plane (i.e. the fourth surface from the object side to the image side) is small, which is conducive to improving the lens demolding efficiency while realizing the 220° super wide angle, thereby reducing the production cost and improving the production efficiency.

[0014] Preferably, the optical total length TTL of the optical lens further satisfies the following relationship: TTL≤12.7mm.

[0015] By adopting the technical scheme, the range of the optical total length is specified, so that the lens tends to be more miniaturized, and the lens meets the requirement of miniaturization and is suitable for smaller and smaller installation space.

[0016] Preferably, the second lens, the third lens, the fourth lens and the fifth lens are all aspherical lenses.

[0017] By adopting the technical scheme, the design of aspherical lenses is increased, which can better correct aberration, and therefore the imaging quality is further improved.

[0018] Preferably, the refractive index of the first lens is Nd1, and Nd1≤1.75; and the maximum field of view lower half aperture of the super wide angle optical lens is less than 5.8mm.

[0019] By adopting the technical scheme, the miniaturization of the lens head size is realized, the assembly space is saved, and the cost performance is high.

[0020] Preferably, the first lens is a convex object-side meniscus negative lens, the second lens is a convex object-side meniscus negative lens, the third lens is a biconvex positive lens, the fourth lens is a convex object-side meniscus negative lens, and the fifth lens is a biconvex positive lens.

[0021] The optical lens is sequentially arranged along an optical path as a convex object-side meniscus negative lens, a convex object-side meniscus negative lens, a biconvex positive lens, a diaphragm, a convex object-side meniscus negative lens, and a biconvex positive lens.

[0022] By adopting the above technical solution, the combination mode and parameters of multiple optical lenses jointly adjust the optical path of the incident light, which is beneficial to balancedly adjust the light transmitted from multiple directions and improve the imaging quality.

[0023] Preferably, the first lens is a convex object-side meniscus negative lens, the second lens is a biconcave negative lens, the third lens is a biconvex positive lens, the fourth lens is a convex object-side meniscus negative lens, and the fifth lens is a biconvex positive lens. The optical lens is sequentially arranged along an optical path as a convex object-side meniscus negative lens, a biconcave negative lens, a biconvex positive lens, a diaphragm, a convex object-side meniscus negative lens, and a biconvex positive lens.

[0024] Preferably, the first lens is a convex object-side meniscus negative lens, the second lens is a convex object-side meniscus negative lens, the second lens is a biconcave negative lens, the fourth lens is a biconcave negative lens, and the fifth lens is a biconvex positive lens. The optical lens is sequentially arranged along an optical path as a convex object-side meniscus negative lens, a convex object-side meniscus negative lens, a biconvex positive lens, a diaphragm, a biconcave negative lens, and a biconvex positive lens.

[0025] Preferably, the fourth lens and the fifth lens are cemented lenses.

[0026] By adopting the above technical solution, the cemented lenses are used to correct the aberration of the optical lens, eliminate or balance the chromatic aberration generated by the lens, reduce the assembly sensitivity of the optical system, improve the imaging resolution of the optical imaging lens, and also reduce the cost.

[0027] Preferably, the materials of the second lens, the third lens, the fourth lens, and the fifth lens are plastic.

[0028] By adopting the above technical solution, the lenses made of plastic material reduce the material cost.

[0029] In summary, the present application at least has the following beneficial effects:

[0030] (1) The present application adopts a catadioptric optical system configuration, and a specific optical relationship design, so that the optical lens of the present application realizes the design requirement of super wide angle while ensuring high imaging quality, and the field of view angle can reach 220°, achieving the final effect of super wide angle light imaging.

[0031] (2) The present application reasonably sets the material and shape of the lens to keep the aperture and total length of the lens at a very small value, realizing the requirement of miniaturization of the lens; at the same time, the specific shape of the lens can improve the lens demolding efficiency and thus reduce the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is the lens layout of the super wide angle optical lens of the present application;

[0033] Figure 2 is the optical path schematic diagram of the super wide angle optical lens of the present application embodiment 1;

[0034] Figure 3 is the optical transfer function diagram of the super wide angle optical lens of the present application embodiment 1;

[0035] Figure 4 is the optical path schematic diagram of the super wide angle optical lens of the present application embodiment 2;

[0036] Figure 5 is the optical path schematic diagram of the super wide angle optical lens of the present application embodiment 3;

[0037] Figure 6 is Figure 2 the view angle diagram formed by the optical path shown;

[0038] Figure 7 is the 220° super wide angle view field diagram of the super wide angle optical lens of the present application.

[0039] BRIEF DESCRIPTION OF DRAWINGS

[0040] 1, first lens; 2, second lens; 3, third lens; 4, fourth lens; 5, fifth lens; 6, diaphragm; 7, filter; 8, protective glass. DETAILED DESCRIPTION

[0041] The present application provides a super wide angle optical lens, in order to make the purpose, technical scheme and advantages of the present application more clear, the following will further describe the embodiments of the present application.

[0042] The technical scheme in some embodiments of the present application will be described clearly and completely in the following combined with the drawings of the specification. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0043] It should be noted that in the present specification, the terms first, second, third, etc. are used only to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the present application.

[0044] Embodiments of the present application disclose an ultra-wide-angle optical lens, comprising an optical lens group having an optical axis, the optical lens group sequentially comprising, from an object side to an image side along the optical axis, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4 and a fifth lens 5, and a diaphragm 6 (STO) arranged between the third lens 3 and the fourth lens 4.

[0045] The first lens 1, the second lens 2 and the fourth lens 4 have negative refractive powers, and the third lens 3 and the fifth lens 5 have positive refractive powers.

[0046] The first lens 1 has a first surface S1 and a second surface S2, the second lens 2 has a third surface S3 and a fourth surface S4, the third lens 3 has a fifth surface S5 and a sixth surface S6, and the cemented lens: the fourth lens 4 and the fifth lens 5 have an eighth surface S8, a ninth surface S9 and a tenth surface S10, and a seventh surface (not marked in the figure) between the sixth surface S6 and the eighth surface S8 is the diaphragm 6.

[0047] The optical lens group satisfies the following relationship:

[0048] The effective focal length F1 of the first lens 1, the effective focal length F2 of the second lens 2 and the effective focal length F3 of the third lens 3 satisfy the relationship: |F2*F3 / F1|≥1.45.

[0049] The maximum image height IH of the optical lens group and the equivalent focal length EFL satisfy the relationship: IH / EFL≥1.9.

[0050] The maximum field of view FOV of the optical lens group, the head aperture size D of the optical lens group and the total track length TTL satisfy the relationship: FOV / (D*TTL)≥1.2, and the total track length is the distance from the center of the object side of the first lens 1 to the imaging surface.

[0051] The maximum field of view FOV of the optical lens group and the angle α4 between the tangent of the arc length of the maximum light passing aperture of the fourth surface and the optical axis satisfy the relationship: FOV / 2 / α4≥1.8, and the condition controls the smaller surface angle of the second lens 2 towards the image surface, that is, the fourth surface S4 from the object side to the image side is smaller, and such a shape is easy to demold, improves the production efficiency and reduces the production cost.

[0052] The total track length TTL satisfies the relationship: TTL≤12.7mm.

[0053] The refractive index of the first lens 1 is Nd1, which satisfies: Nd1≤1.75; the lower half radius of the maximum field of view of the super-wide-angle optical lens is less than 5.8 mm, the size of the lens head is miniaturized, the assembly space is saved, and the cost performance is high.

[0054] By satisfying the above conditions, the ratio of the above data is constrained, which can effectively limit the length of the lens, so that the lens satisfies the condition of structure miniaturization, can also have a super-wide-angle field of view, and ensures the clarity of imaging.

[0055] In the embodiment of the application, the optical total length TTL of the optical lens group is controlled to be less than or equal to 12.7 mm by reasonably controlling the optical power of the third lens 3, so as to meet the requirement of miniaturization of the lens group.

[0056] In the embodiment of the application, the second lens 2, the third lens 3, the fourth lens 4 and the fifth lens 5 are all aspherical lenses, and the materials of the second lens 2, the third lens 3, the fourth lens 4 and the fifth lens 5 are all plastics.

[0057] By increasing the number of aspherical lenses, the imaging quality can be effectively improved, and the plastic material is beneficial to cost saving.

[0058] In the embodiment of the application, the fourth lens 4 and the fifth lens 5 are cemented lenses. The lens cementing can effectively improve the chromatic aberration of the optical system, reduce the assembly sensitivity of the system, and reduce the cost.

[0059] In the embodiment of the application, the diaphragm 6 is arranged between the third lens 3 and the cemented lens, and the light rays of the lens group before the transition diaphragm 6 are beneficial to shorten the total length of the optical lens group. By adjusting the size of the diaphragm, the clarity and brightness of the imaging can be balanced.

[0060] In the embodiment of the application, the first lens 1, the second lens 2, the third lens 3, the diaphragm 6, the fourth lens 4, the fifth lens 5, the filter 7 and the protective glass 8 are sequentially arranged from the object side to the image side, wherein the filter 7 has an eleventh surface S11 and a twelfth surface S12, and the protective glass 8 has a thirteenth surface S13 and a fourteenth surface S14.

[0061] Embodiment 1:

[0062] In the embodiment 1, as shown in the following table, the first lens 1 is a convex moon-shaped negative lens, the second lens 2 is a convex moon-shaped negative lens, the third lens 3 is a double-convex positive lens, the fourth lens 4 is a convex moon-shaped negative lens, and the fifth lens 5 is a double-convex positive lens. Figure 1 As shown in the following table, the first lens 1 is a convex moon-shaped negative lens, the second lens 2 is a convex moon-shaped negative lens, the third lens 3 is a double-convex positive lens, the fourth lens 4 is a convex moon-shaped negative lens, and the fifth lens 5 is a double-convex positive lens.

[0063] Figure 2 ​As shown, the optical lens along the optical path in sequence is, convex object side meniscus negative lens, convex object side meniscus negative lens, biconvex positive lens, diaphragm 6, convex object side meniscus negative lens, and biconvex positive lens, filter 7 and protective glass 8.

[0064] The convex object side meniscus negative lens as the first lens 1 has negative refractive power, and the convex shape of the object side of the first lens 1 is beneficial to collect the large-angle light rays of the lens, and is more beneficial to the sliding of liquid such as raindrops.

[0065] The convex object side meniscus negative lens as the second lens 2 has negative refractive power, which can fine-tune the light rays collected by the first lens 1, smoothly transition the light rays to the rear optical system, and is beneficial to making the picture brightness more uniform and improving the imaging quality of the optical lens.

[0066] The biconvex positive lens as the third lens 3 has positive refractive power, which can compress the light rays to make the light rays smoothly enter the diaphragm, is beneficial to increasing the diaphragm aperture and increasing the system light flux, and the aspherical third lens 3 made of plastic material has better convergence effect on the light rays, which is beneficial to the improvement of the resolution.

[0067] In the embodiment 1, the convex object side meniscus negative lens as the fourth lens 4 and the biconvex positive lens as the fifth lens 5 are glued to form a glued lens, which can eliminate or balance the chromatic aberration generated by the lens and reduce the tolerance sensitivity; and both of them are plastic lenses, which can effectively reduce the cost.

[0068] Based on the structure of the optical lens provided in the above embodiment 1, in the case that the optical lens sequentially includes convex object side meniscus negative lens, convex object side meniscus negative lens, biconvex positive lens, diaphragm 6, convex object side meniscus negative lens, and biconvex positive lens, filter 7 and protective glass 8, Table 1 shows the parameters of the plurality of optical lenses of the optical lens.

[0069] Table 1:

[0070]

[0071] As shown in the table, the object side S1 of the first lens 1, i.e. the convex object side meniscus negative lens, is a convex surface, and the image side S2 is a concave surface. Figure 2

[0072] The object side S3 of the second lens 2, i.e. the convex object side meniscus negative lens, is a convex surface, and the image side S4 is a concave surface.

[0073] The object side S5 of the third lens 3, i.e. the biconvex positive lens, is a convex surface, and the image side S6 is a convex surface.

[0074] The object side S8 of the fourth lens 4, i.e. the convex object side meniscus negative lens, is a convex surface, and the image side S9 is a concave surface.

[0075] ​The object side S9 of the fifth lens 5, i.e. the biconvex positive lens, is a convex surface, and the image side S10 is a convex surface;

[0076] The fourth lens 4 and the fifth lens 5 are mutually cemented, and share S9, so S9 is a concave surface relative to the fourth lens 4 and a convex surface relative to the fifth lens 5.

[0077] The object side of the filter 7 is S11, and the image side is S12; the object side of the protective glass 8 is S13, and the image side is S14, and IMA is the imaging surface.

[0078] Further, the second lens 2, the third lens 3, the fourth lens 4 and the fifth lens 5 in the embodiment of the present application are aspherical surfaces, satisfying the following equation:

[0079]

[0080] Wherein, Z(h) is the distance vector height of the aspherical surface at the position of height h along the main optical axis from the vertex of the aspherical surface; c = 1 / r, c is the curvature of the aspherical surface, r represents the curvature radius of the mirror surface, k is the conic coefficient, A, B, C, D, E, F, G are high-order aspherical surface coefficients.

[0081] Further, the parameters of the object side and the image side of the second lens 2, the third lens 3, the fourth lens 4 and the fifth lens 5 are shown in Table 2.

[0082] Table 2:

[0083]

[0084]

[0085] The parameters of the optical lens of the embodiment 1 are shown in Table 3.

[0086] Table 3:

[0087] FOV 220 [alpha]4 53.8245 F1 -5.8521 F2 -2.4231 F3 3.8330 EFL 0.9629 IH 1.92 Nd1 1.7400 D 14.00 TTL 12.70

[0088] In the embodiment 1, the relationship between the maximum field of view FOV of the optical lens group and the angle α4 between the tangent of the arc length of the fourth surface at the maximum light passing aperture and the optical axis: FOV / 2 / α4 = 2.0437, satisfies the relationship FOV / 2 / α4≥1.8;

[0089] The relationship between the effective focal length F1 of the first lens 1, the effective focal length F2 of the second lens 2 and the effective focal length F3 of the third lens 3: |F2*F3 / F1| = 1.5871, satisfies the relationship |F2*F3 / F1|≥1.45;

[0090] The relationship between the maximum image height IH of the optical lens group and the equivalent focal length EFL of the optical lens group: IH / EFL = 1.9940, satisfying the relationship IH / EFL = 1.95;

[0091] The refractive index Nd1 of the first lens 1 is 1.74, satisfying the relationship Nd1 = 1.75;

[0092] The relationship between the maximum field of view FOV of the optical lens group, the head aperture size D of the optical lens group, and the total optical length TTL of the optical lens group: FOV / (D*TTL) = 1.2373, satisfying the relationship FOV / (D*TTL) = 1.2.

[0093] The optical transfer function diagram of the optical lens of the embodiment is shown in Figure 3 It can be seen that the imaging quality of the optical lens is uniform from the center to the edge of the field of view, that is, the imaging quality of the embodiment is high, and the entire image is very clear.

[0094] In summary, the optical lens of the embodiment can ensure high imaging quality while achieving the requirement of ultra-wide angle, with a field of view angle of up to 220°, achieving the final effect of ultra-wide angle light-in imaging clarity.

[0095] Embodiment 2:

[0096] In another specific embodiment 2 of the present application, as shown in Figure 4 The first lens 1 is a convex moon-shaped negative lens, the second lens 2 is a double-concave negative lens, the third lens 3 is a double-convex positive lens, the fourth lens 4 is a convex moon-shaped negative lens, and the fifth lens 5 is a double-convex positive lens.

[0097] The optical lens along the optical path is, in order, a convex moon-shaped negative lens, a double-concave negative lens, a double-convex positive lens, a diaphragm 6, a convex moon-shaped negative lens, a double-convex positive lens, a filter 7, and a protective glass 8.

[0098] The convex moon-shaped negative lens as the first lens 1 has negative focal power, and the convex shape of the first lens 1 is beneficial to collect the light rays of the lens at a large angle, and is also beneficial to the sliding of liquid such as raindrops.

[0099] The double-concave negative lens as the second lens 2 has negative focal power, which can collect the light rays of the first lens 1 and make fine adjustments, so that the light rays enter the rear lens group, which is beneficial to avoid the excessive dispersion of the light rays to cause the large aperture of the rear lens.

[0100] The double-convex positive lens as the third lens 3 has positive focal power, which can compress the light rays to make the light rays enter the diaphragm smoothly, which is beneficial to increase the diaphragm aperture and increase the light flux of the system; and the aspherical third lens 3 made of plastic material has better convergence effect on the light rays, which is beneficial to the improvement of the resolution.

[0101] In the embodiment, the convex object-side meniscus negative lens as the fourth lens 4 and the biconvex positive lens as the fifth lens 5 are cemented to form a cemented lens, which can eliminate or balance the chromatic aberration generated by the lens, reduce the tolerance sensitivity, and are both plastic lenses, which can effectively reduce the cost.

[0102] Based on the structure of the optical lens provided in Embodiment 2, in the case where the optical lens sequentially comprises a convex object-side meniscus negative lens, a biconcave negative lens, a biconvex positive lens, a diaphragm 6, a convex object-side meniscus negative lens, a biconvex positive lens, a filter 7, and a protective glass 8, Table 4 shows the parameters of the plurality of optical lenses of the optical lens.

[0103] Table 4:

[0104]

[0105]

[0106] Further, the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5 in the embodiments of the present application are aspherical surfaces, which satisfy the following equation:

[0107]

[0108] wherein Z(h) is the distance from the vertex of the aspherical surface to the position of the aspherical surface along the main optical axis at a height h; c = 1 / r, c is the curvature of the aspherical surface at the pole, r represents the radius of curvature of the lens, k is the conic coefficient, A, B, C, D, E, F, and G are high-order aspherical surface coefficients.

[0109] Further, the parameters of the object side and the image side of the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5 are shown in Table 5.

[0110] Table 5:

[0111]

[0112]

[0113] The parameters of the optical lens of Embodiment 2 are shown in Table 6.

[0114] Table 6:

[0115] FOV 220 [alpha]4 60.5700 F1 -6.0431 F2 -2.2170 F3 4.0190 EFL 0.9558 IH 1.92 Nd1 1.7400 D 14.20 TTL 12.70

[0116] In Embodiment 2, the relationship between the maximum field of view FOV of the optical lens group and the angle a4 between the tangent of the arc length of the fourth surface at the maximum light aperture and the optical axis is: FOV / 2 / a4 = 1.8161, which satisfies the relationship FOV / 2 / a4 ≥ 1.8.

[0117] The relationship between the effective focal length F1 of the first lens 1, the effective focal length F2 of the second lens 2, and the effective focal length F3 of the third lens 3 is |F2*F3 / F1| = 1.4745, which satisfies the relationship |F2*F3 / F1| ≥ 1.45;

[0118] The relationship between the maximum image height IH of the optical lens group and the equivalent focal length EFL of the optical lens group is IH / EFL = 2.0089, which satisfies the relationship IH / EFL ≥ 1.95;

[0119] The refractive index Nd1 of the first lens 1 is 1.7400, which satisfies the relationship Nd1 ≤ 1.75;

[0120] The relationship between the maximum field of view FOV of the optical lens group, the head aperture size D of the optical lens group, and the total optical length TTL of the optical lens group is FOV / (D*TTL) = 1.2199, which satisfies the relationship FOV / (D*TTL) ≥ 1.2.

[0121] Embodiment 3:

[0122] In another specific embodiment 3 of the present application, as shown in Figure 5 the first lens 1 is a convex object side meniscus negative lens, the second lens 2 is a convex object side meniscus negative lens, the second lens 2 is a double concave negative lens, the fourth lens 4 is a double concave negative lens, and the fifth lens 5 is a double convex positive lens;

[0123] The optical lens is in sequence along the optical path, a convex object side meniscus negative lens, a convex object side meniscus negative lens, a double convex positive lens, a diaphragm 6, a double concave negative lens, and a double convex positive lens.

[0124] The convex object side meniscus negative lens as the first lens 1 has a negative focal power, and the convex shape of the first lens 1 towards the object side is conducive to collecting large-angle light rays of the lens, and is more conducive to the sliding of liquid such as raindrops.

[0125] The convex object side meniscus negative lens as the second lens 2 has a negative focal power, which can fine-tune the light rays collected by the first lens 1, smoothly transition the light rays to the rear optical system, and is conducive to making the picture brightness more uniform and improving the imaging quality of the optical lens.

[0126] The double convex positive lens as the third lens 3 has a positive focal power, which can compress light rays to smoothly shoot into the diaphragm, is conducive to increasing the diaphragm aperture and increasing the system light flux, and the aspherical third lens 3 with a plastic material has a better converging effect on light rays, which is conducive to improving the resolution.

[0127] In the embodiment, the double-concave negative lens as the fourth lens 4 and the double-convex positive lens as the fifth lens 5 are cemented to form a cemented lens, which can eliminate or balance chromatic aberration generated by the lens, reduce tolerance sensitivity, and are both plastic lenses, which can effectively reduce the cost.

[0128] Based on the structure of the optical lens provided in Embodiment 3, in the case where the optical lens sequentially comprises a convex object-side meniscus negative lens, a convex object-side meniscus negative lens, a double-convex positive lens, a diaphragm 6, a double-concave negative lens, and a double-convex positive lens, a filter 7, and a protective glass 8, Table 7 shows the parameters of the optical lenses of the optical lens.

[0129] Table 7:

[0130]

[0131]

[0132] Further, the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5 in the embodiments of the present application are aspherical surfaces, and satisfy the following equation:

[0133]

[0134] wherein Z(h) is the distance from the vertex of the aspherical surface to the position of the aspherical surface along the main optical axis at a height h; c = 1 / r, c is the curvature of the aspherical surface at the pole, r represents the radius of curvature of the lens, k is the conic coefficient, A, B, C, D, E, F, and G are high-order aspherical surface coefficients.

[0135] Further, the parameters of the object side and the image side of the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5 are shown in Table 8.

[0136] Table 8:

[0137]

[0138]

[0139] The parameters of the optical lens of Embodiment 3 are shown in Table 9.

[0140] Table 9:

[0141] FOV 220 [alpha]4 56.6319 F1 -5.8366 F2 -2.5630 F3 4.6102 EFL 0.9598 IH 1.92 Nd1 1.7400 D 14.00 TTL 12.70

[0142] In Embodiment 3, the relationship between the maximum field of view FOV of the optical lens group and the angle a4 between the tangent of the arc length of the fourth surface at the maximum light entrance aperture and the optical axis is FOV / 2 / a4 = 1.9424, which satisfies the relationship FOV / 2 / a4 ≥ 1.8;

[0143] The relationship between the effective focal length F1 of the first lens 1, the effective focal length F2 of the second lens 2, and the effective focal length F3 of the third lens 3 is |F2*F3 / F1|=2.0245, which satisfies the relationship |F2*F3 / F1|≥1.45;

[0144] The relationship between the maximum image height IH of the optical lens assembly and the equivalent focal length EFL of the optical lens assembly is IH / EFL=2.0005, which satisfies the relationship IH / EFL≥1.95;

[0145] The refractive index Nd1 of the first lens 1 is 1.7400, which satisfies the relationship Nd1≤1.75.

[0146] The relationship between the maximum field of view FOV of the optical lens assembly, the head aperture size D of the optical lens assembly, and the total optical length TTL of the optical lens assembly is FOV / (D*TTL)=1.2372, which satisfies the relationship FOV / (D*TTL)≥1.2.

[0147] Referring to Figure 6 and Figure 7 is a field of view formed by half of the optical path shown in Embodiment 1, Figure 6 is a 220° super wide-angle field of view formed by the complete optical path of the present embodiment. Figure 7 The 220° super wide-angle field of view formed by the complete optical path of the present embodiment is shown.

[0148] In summary, the optical lens assembly of the present application realizes the requirements of miniaturization by reasonably matching the lens shapes and optical power combinations between the lenses, reduces the aperture and the total optical length of the lens, realizes the requirements of low cost by reasonably selecting the glass-plastic hybrid architecture, realizes the requirements of clear imaging in the 220° super wide-angle field of view by reasonably distributing the optical power of the lenses, and simultaneously has the advantages of super wide-angle field of view, miniaturization, and clear imaging.

[0149] The above are only optional embodiments of the present application and are not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An ultra-wide-angle optical lens characterized in that: The optical lens assembly comprises an optical lens group having an optical axis, the optical lens group being sequentially provided with five lenses having optical power along the optical axis from an object side to an image side, the five lenses being a first lens (1), a second lens (2), a third lens (3), a fourth lens (4) and a fifth lens (5), respectively, and a diaphragm (6) being arranged between the third lens (3) and the fourth lens (4); the first lens (1), the second lens (2) and the fourth lens (4) have negative optical power, and the third lens (3) and the fifth lens (5) have positive optical power; the object side surface of the first lens (1) is convex and the image side surface is concave, the image side surface of the second lens (2) is concave, the image side surface of the third lens (3) is convex, the object side surface of the fourth lens (4) is convex and the image side surface is concave, and the object side surface and the image side surface of the fifth lens (5) are both convex, and the fourth lens (4) and the fifth lens (5) are both cemented lenses; the optical lens assembly satisfies the following relationship: ； ； ； ； wherein F1, F2 and F3 are effective focal lengths of the first lens (1), the second lens (2) and the third lens (3), respectively, IH is a maximum image height of the optical lens assembly, EFL is an equivalent focal length of the optical lens assembly, FOV is a maximum field of view of the optical lens assembly, D is a head aperture size of the optical lens assembly, TTL is an optical total length of the optical lens assembly, and a4 is an included angle between a tangent of an arc length of a maximum light passing aperture of a fourth surface and the optical axis. 2.The ultra-wide optical lens according to claim 1, wherein: The total optical length TTL of the optical lens further satisfies the following relationship: . 3.The ultra-wide optical lens according to claim 1, wherein: The second lens (2), the third lens (3), the fourth lens (4) and the fifth lens (5) are all aspherical lenses.

4. The ultra-wide optical lens according to claim 1, wherein: The refractive index of the first lens (1) is Nd1, and The maximum field of view of the super-wide-angle optical lens is less than 5.8mm.

5. The ultra-wide optical lens according to claim 1, wherein: The first lens (1) is a convex object side meniscus negative lens, the second lens (2) is a convex object side meniscus negative lens, the third lens (3) is a double convex positive lens, the fourth lens (4) is a convex object side meniscus negative lens, and the fifth lens (5) is a double convex positive lens. The optical lens assembly sequentially comprises, along an optical path, a convex object side meniscus negative lens, a convex object side meniscus negative lens, a double convex positive lens, a diaphragm (6), a convex object side meniscus negative lens, and a double convex positive lens.

6. The ultra-wide optical lens according to claim 1, wherein: The first lens (1) is a convex object side meniscus negative lens, the second lens (2) is a double concave negative lens, the third lens (3) is a double convex positive lens, the fourth lens (4) is a convex object side meniscus negative lens, and the fifth lens (5) is a double convex positive lens. The optical lens assembly sequentially comprises, along an optical path, a convex object side meniscus negative lens, a double concave negative lens, a double convex positive lens, a diaphragm (6), a convex object side meniscus negative lens, and a double convex positive lens.

7. The ultra-wide optical lens according to claim 1, wherein: The second lens (2), the third lens (3), the fourth lens (4) and the fifth lens (5) are all made of plastic.

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