wide-angle lens

Abstract

The present application relates to a wide-angle lens, comprising in order from the object side to the image side along the optical axis a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens, the first lens, the second lens, the third lens, the fifth lens and the ninth lens have negative focal power; the fourth lens, the sixth lens and the tenth lens have positive focal power; the seventh lens and the eighth lens have opposite focal power.

Description

Technical Field

[0001] This invention relates to the field of optical technology, and more specifically to a wide-angle lens. Background Technology

[0002] With the development of optical imaging lenses, the demand for lenses in fields such as video surveillance, action cameras, and automotive lenses is constantly increasing, placing higher requirements on the image quality of optical imaging lenses. At the same time, to provide a wider field of view, optical imaging lenses are required to have a large field of view. Furthermore, to capture more light, optical imaging lenses are required to have a large aperture. Finally, for portability, optical imaging lenses are required to be small and miniaturized.

[0003] However, current optical lenses have the drawback of not being able to simultaneously achieve high resolution and high brightness. Furthermore, current optical lenses have a narrow field of view, making it difficult to balance distortion control with high resolution, and they are also bulky and not portable. Summary of the Invention

[0004] In view of this, the present invention aims to propose a wide-angle lens that solves the problem that current lenses cannot simultaneously achieve high resolution, high brightness, wide field of view, low distortion, large aperture and miniaturization.

[0005] An embodiment of the present invention provides a wide-angle lens, which, along the optical axis from the object side to the image side, sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens. The first lens, the second lens, the third lens, the fifth lens, and the ninth lens have negative optical power; the fourth lens, the sixth lens, and the tenth lens have positive optical power; and the seventh lens and the eighth lens have opposite optical powers.

[0006] In a preferred embodiment of the present invention, the first lens is a convex-concave lens; the image-side surfaces of the second lens, the third lens, and the ninth lens are concave; the fourth lens, the sixth lens, and the tenth lens are convex-convex lenses; the fifth lens is a concave-convex lens; the object-side surface of the seventh lens is convex; and the image-side surface of the eighth lens is convex.

[0007] In a preferred embodiment of the present invention, the maximum aperture D1 of the first lens and the effective focal length F1 of the first lens satisfy: -2.5 <D1 / F1<-1.7。

[0008] In a preferred embodiment of the present invention, the effective focal length F1 of the first lens and the total effective focal length F of the wide-angle lens satisfy: -2.5 <F1 / F<-1。

[0009] In a preferred embodiment of the present invention, the effective focal length F2 of the second lens and the total effective focal length F of the wide-angle lens satisfy: -5 <F2 / F<-2。

[0010] In a preferred embodiment of the present invention, the combined focal length F12 of the first lens and the second lens satisfies -1.6 with the total effective focal length F of the wide-angle lens. <F12 / F<-0.5。

[0011] In a preferred embodiment of the present invention, the aperture stop is located between the fifth lens and the sixth lens, and the absolute values ​​of the distance d5 between the image side of the fifth lens and the aperture stop on the optical axis and the total optical length TTL of the wide-angle lens satisfy: 0 < |d5 / TTL| < 0.1.

[0012] In a preferred embodiment of the present invention, the effective focal length F5 of the fifth lens and the total effective focal length F of the wide-angle lens satisfy: -7 <F5 / F<-2。

[0013] In a preferred embodiment of the present invention, the effective focal length F6 of the sixth lens and the total effective focal length F of the wide-angle lens satisfy: 1.7 <F6 / F<3。

[0014] In a preferred embodiment of the present invention, the effective focal length F9 of the ninth lens and the total effective focal length F of the wide-angle lens satisfy: -3.5 <F9 / F<-1。

[0015] In a preferred embodiment of the present invention, the combined focal length Fa of the first lens to the fifth lens and the total effective focal length F of the wide-angle lens satisfy: -2.8 <Fa / F<-1。

[0016] In a preferred embodiment of the present invention, the combined focal length Fb of the sixth to tenth lenses and the total effective focal length F of the wide-angle lens satisfy: 1.5 <Fb / F<2.5。

[0017] In a preferred embodiment of the present invention, the combined focal length Fa of the first lens to the fifth lens and the combined focal length Fb of the sixth lens to the tenth lens satisfy: -1.2 <Fa / Fb<-0.5。

[0018] In a preferred embodiment of the present invention, the maximum aperture D of the wide-angle lens, the total optical length TTL of the wide-angle lens, and the half-image height H of the wide-angle lens satisfy: 0 <D / TTL / H<0.2。

[0019] In a preferred embodiment of the present invention, the back focal length (BFL) of the wide-angle lens and the total optical length (TTL) of the wide-angle lens satisfy: 0.1 <BFL / TTL<0.3。

[0020] In a preferred embodiment of the present invention, the focal length F1 of the first lens, the radius of curvature R11 of the object-side surface of the first lens, and the radius of curvature R12 of the image-side surface of the first lens satisfy: -2.2 <F1 / R11+F1 / R12<-1.3。

[0021] In a preferred embodiment of the present invention, the combined effective focal length F34 of the third lens and the fourth lens satisfies the same condition as the effective focal length F of the wide-angle lens: 1.5. <F34 / F<2.8。

[0022] In a preferred embodiment of the present invention, the effective focal length F4 of the fourth lens and the radius of curvature R42 of the image-side surface of the fourth lens satisfy: -0.9 <F4 / R42<1.2。

[0023] In a preferred embodiment of the present invention, the effective focal length F5 of the fifth lens and the effective focal length F6 of the sixth lens satisfy: -2.8 <F5 / F6<-0.8。

[0024] In a preferred embodiment of the present invention, the combined effective focal length F78 of the seventh lens and the eighth lens and the effective focal length F of the wide-angle lens satisfy: 2.6 <F78 / F<7.9。

[0025] In a preferred embodiment of the present invention, the effective focal length F10 of the tenth lens and the effective focal length F of the wide-angle lens satisfy: 2.0 <F10 / F<3.7。

[0026] In a preferred embodiment of the present invention, the radius of curvature R101 of the object side of the tenth lens, the radius of curvature R102 of the image side of the tenth lens, and the effective focal length F of the wide-angle lens satisfy: -0.5 < (R101 + R102) / F < 1.1.

[0027] In a preferred embodiment of the present invention, the effective focal length F of the wide-angle lens and the entrance pupil diameter ENPD of the wide-angle lens satisfy: 1.6 <F / ENPD<1.9。

[0028] In a preferred embodiment of the present invention, the radius of curvature R31 of the object side of the third lens and the radius of curvature R32 of the image side of the third lens satisfy: -2.6<(R31-R32) / (R31+R32)<0.9.

[0029] In a preferred embodiment of the present invention, the radius of curvature R71 of the object side of the seventh lens and the radius of curvature R72 of the image side of the seventh lens satisfy: 0.1 < (R71-R72) / (R71+R72) < 3.0.

[0030] The wide-angle lens of this invention employs ten lenses. By combining the shape of each lens, the positive and negative optical power, and reasonable parameter settings, the wide-angle lens can achieve a large aperture (FNO≤1.8), a large field of view (FOV≥160°), and high resolution (35 million pixels). At the same time, it also achieves at least one of the following beneficial effects: miniaturization, small size, low distortion (F-Theta distortion absolute value less than 5%), high relative illumination (RI≥50%), and no blurring at high and low temperatures. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the optical structure of a wide-angle lens according to the first embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the optical structure of a wide-angle lens according to a second embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the optical structure of a wide-angle lens according to a third embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the optical structure of a wide-angle lens according to the fourth embodiment of the present invention. Detailed Implementation

[0036] The description of the embodiments in this specification should be taken in conjunction with the accompanying drawings, which should form part of the complete specification. In the drawings, the shape or thickness of the embodiments may be exaggerated and may be indicated in a simplified or convenient manner. Furthermore, parts of the various structures in the drawings will be described separately; it is worth noting that elements not shown in the figures or not described in words are in a form known to those skilled in the art.

[0037] The descriptions of the embodiments herein, including any references to directions and orientations, are for ease of description only and should not be construed as limiting the scope of the invention. The following description of preferred embodiments involves combinations of features, which may exist independently or in combination; the invention is not particularly limited to the preferred embodiments. The scope of the invention is defined by the claims.

[0038] In this invention, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object-side surface of the lens, and the surface of each lens closest to the imaging side is called the image-side surface of the lens.

[0039] like Figure 1-4 As shown, the wide-angle lens of this embodiment of the invention, along the optical axis from the object side to the image side, sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, an aperture stop STO, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, a flat plate CG, and an image plane IMA.

[0040] The first lens L1 is a convex-concave lens with negative optical power, which helps to reduce the incident angle of the incident light on the object side of the second lens L2, so that the light can enter the rear optical system smoothly and facilitate the correction of aberrations in the rear group.

[0041] The second lens L2 is a lens with negative optical power and a concave image side, which serves to diverge light rays, further reducing the incident angle of light rays on the object side of the third lens L3, reducing off-axis aberrations of subsequent optical systems, and achieving higher image quality.

[0042] The third lens, L3, is a lens with negative optical power and a concave image side. It serves to diverge light rays, making the light path transition smoothly. At the same time, it helps to allow as much large-angle light as possible to enter the rear lens, thereby improving the lens illumination.

[0043] The fourth lens, L4, is a convex-convex lens with positive optical power, which is beneficial for light convergence, reduces the incident height of light on the subsequent lens, reduces the diameter of the rear lens, and facilitates lens miniaturization.

[0044] The fifth lens, L5, is a concave-convex lens with negative optical power that can balance spherical aberration. Its aspherical surface shape corrects field curvature, resulting in higher image quality.

[0045] The sixth lens, L6, is a convex-convex lens with positive optical power, used for converging light rays. It helps to balance the negative spherical aberration and field curvature generated by the fifth lens, L5, and improves the imaging quality of the system.

[0046] The seventh lens, L7, is a lens with a convex object side, which is beneficial for effectively bridging the light rays in front, correcting field curvature, and improving image quality.

[0047] The eighth lens, L8, is a lens with a convex image side, which is beneficial for the smooth incidence of large-angle light onto the image plane and helps to improve the lens illumination.

[0048] The ninth lens L9 is a lens with negative refractive power and a concave image-side surface, which can correct the spherical aberration and coma of the eighth lens L8 and help improve imaging quality.

[0049] The tenth lens L10 is a biconvex lens with positive refractive power, which helps reduce the angle of chief rays to meet the requirements of matching the chip CRA curve.

[0050] In the preferred embodiment of the present invention, the wide-angle lens according to the present invention further comprises a stop STO, and the stop STO is located between the fifth lens L5 and the sixth lens L6. However, it should be noted that the position of the stop STO disclosed herein is merely an example and not a limitation; in alternative embodiments, the stop STO may also be arranged at other positions according to actual requirements.

[0051] In the preferred embodiment of the present invention, the seventh lens L7 and the eighth lens L8 are cemented, which is beneficial for reducing the air gap between the two lenses, realizing miniaturization of the lens, reducing sensitive tolerance problems such as tilt and decentration generated during the assembly process of the lenses, correcting chromatic aberration to a certain extent, and facilitating the achievement of higher image quality.

[0052] In the preferred embodiment of the present invention, the maximum effective aperture D1 of the first lens L1 and the effective focal length F1 of the first lens L1 satisfy: -2.5 < D1 / F1 < -1.7, which is beneficial for allowing large-angle light rays to enter the optical system and increasing the field angle of the optical system.

[0053] In the preferred embodiment of the present invention, the effective focal length F1 of the first lens L1 and the total effective focal length F of the wide-angle lens satisfy: -2.5 < F1 / F < -1; meanwhile, the effective focal length F2 of the second lens L2 and the total effective focal length F of the wide-angle lens satisfy: -5 < F2 / F < -2. With this arrangement, the first lens L1 and the second lens L2 function to diverge light rays, enabling a smooth transition of the light ray trend, and meanwhile facilitating the entry of more large-angle light rays into subsequent lenses as much as possible, thereby improving the illuminance of the lens.

[0054] In the preferred embodiment of the present invention, the combined focal length F12 of the first lens L1 and the second lens L2 and the total effective focal length F of the wide-angle lens satisfy: -1.6 < F12 / F < -0.5, which is beneficial for allowing more light rays to enter the optical system smoothly, controlling the light ray trend of the optical system, realizing stable imaging, and improving the resolving power of the lens.

[0055] In the preferred embodiment of the present invention, the distance d5 between the image-side surface of the fifth lens L5 on the optical axis and the stop STO and the absolute value of the total optical length TTL of the wide-angle lens satisfy: 0 < |d5 / TTL| < 0.1, thereby enabling a smooth transition of light rays near the stop STO and facilitating the achievement of higher resolving power of the lens.

[0056] In the preferred embodiment of the present invention, the effective focal length F5 of the fifth lens L5 and the total effective focal length F of the wide-angle lens satisfy: -7<F5 / F<-2, and meanwhile, the effective focal length F6 of the sixth lens L6 and the total effective focal length F of the wide-angle lens satisfy: 1.7<F6 / F<3. Such arrangement can balance the astigmatism generated by the fifth lens L5 and the sixth lens L6, reduce aberration and improve resolving power.

[0057] In the preferred embodiment of the present invention, the effective focal length F9 of the ninth lens L9 and the total effective focal length F of the wide-angle lens satisfy: -3.5<F9 / F<-1. Reasonable distribution of the focal length of the ninth lens introduces negative distortion, which is beneficial for balancing the positive distortion generated by the sixth lens L6 and the seventh lens L7, and reduces the degree of image distortion.

[0058] In the preferred embodiment of the present invention, the combined focal length Fa of the first lens L1 to the fifth lens L5 and the total effective focal length F of the wide-angle lens satisfy: -2.8<Fa / F<-1, and meanwhile, the combined focal length Fb of the sixth lens L6 to the tenth lens L10 and the total effective focal length F of the wide-angle lens satisfy: 1.5<Fb / F<2.5, and the combined focal length Fa of the first lens L1 to the fifth lens L5 and the combined focal length Fb of the sixth lens L6 to the tenth lens L10 satisfy: -1.2<Fa / Fb<-0.5. Reasonable distribution of positive and negative optical power between the front group (lenses before the stop) and the rear group (lenses after the stop) is conducive to controlling the propagation path of light, making light travel more smoothly, reducing the sensitivity of the system and improving the imaging quality of the system.

[0059] In the preferred embodiment of the present invention, the maximum clear aperture D of the wide-angle lens, the total optical length TTL of the wide-angle lens and the half image height H of the wide-angle lens satisfy: 0<D / TTL / H<0.2. Controlling the maximum aperture of the optical system is conducive to reducing the volume and realizing miniaturization.

[0060] In the preferred embodiment of the present invention, the back focal length BFL of the wide-angle lens and the total optical length TTL of the wide-angle lens satisfy: 0.1<BFL / TTL<0.3, which is beneficial for the assembly of the optical lens and avoids interference.

[0061] In the preferred embodiment of the present invention, the focal length F1 of the first lens L1, the curvature radius R11 of the object-side surface of the first lens L1 and the curvature radius R12 of the image-side surface of the first lens L1 satisfy: -2.2<F1 / R11+F1 / R12<-1.3. Thereby, the first lens L1 can provide sufficient refractive power for the optical system, and meanwhile maintain the characteristic of large field of view of the optical system.

[0062] In a preferred embodiment of the present invention, the combined effective focal length F34 of the third lens L3 and the fourth lens L4 and the effective focal length F of the wide-angle lens satisfy: 1.5 < F34 / F < 2.8. This not only facilitates better balancing of field curvature and chromatic aberration by the optical lens, but also helps improve the resolving power of the lens.

[0063] In a preferred embodiment of the present invention, the effective focal length F4 of the fourth lens L4 and the curvature radius R42 of the image-side surface of the fourth lens L4 satisfy: -0.9 < F4 / R42 < 1.2. This limits the shape of the fourth lens L4, facilitates eliminating distortion introduced by the first lens L1, improves the imaging quality of the optical imaging lens, and at the same time facilitates the processing of the fourth lens L4.

[0064] In a preferred embodiment of the present invention, the effective focal length F5 of the fifth lens L5 and the effective focal length F6 of the sixth lens L6 satisfy: -2.8 < F5 / F6 < -0.8. This helps realize thermal compensation of the optical lens, so that the optical lens has good temperature performance.

[0065] In a preferred embodiment of the present invention, the combined effective focal length F78 of the seventh lens and the eighth lens and the effective focal length F of the wide-angle lens satisfy: 2.6 < F78 / F < 7.9. By reasonably setting the combined focal length of the seventh lens L7 and the eighth lens L8, it is conducive to allowing more light to enter stably and helps improve illuminance.

[0066] In a preferred embodiment of the present invention, the effective focal length F10 of the tenth lens L10 and the effective focal length F of the wide-angle lens satisfy: 2.0 < F10 / F < 3.7. The curvature radius R101 of the object-side surface of the tenth lens L10, the curvature radius R102 of the image-side surface of the tenth lens L10 and the effective focal length F of the wide-angle lens satisfy: -0.5 < (R101+R102) / F < 1.1. Through reasonable arrangement of the tenth lens L10, it is favorable to correct astigmatism, field curvature and distortion generated by the front lenses, thereby realizing correction of comprehensive aberrations and improving imaging quality.

[0067] In a preferred embodiment of the present invention, the effective focal length F of the wide-angle lens and the entrance pupil diameter ENPD of the wide-angle lens satisfy: 1.6 < F / ENPD < 1.9. This can realize a large aperture, increase the amount of transmitted light, and improve imaging brightness and contrast.

[0068] In a preferred embodiment of the present invention, the radius of curvature R31 of the object-side surface of the third lens L3 and the radius of curvature R32 of the image-side surface of the third lens L3 satisfy: -2.6 < (R31 - R32) / (R31 + R32) < 0.9. Therefore, by effectively controlling the radius of curvature of the third lens L3, it helps to ensure that the incident light rays exiting the third lens L3 are relatively smooth when incident on the object-side surface of the fourth lens L4, which helps to reduce the tolerance sensitivity of the optical lens.

[0069] In a preferred embodiment of the present invention, the radius of curvature R71 of the object side and the radius of curvature R72 of the image side of the seventh lens L7 satisfy: 0.1 < (R71 - R72) / (R71 + R72) < 3.0. Therefore, limiting the radius of curvature of the seventh lens L7 to a certain range helps reduce the manufacturing difficulty of the seventh lens L7 and also helps reduce aberrations in the edge field of view.

[0070] In addition, the wide-angle lens in this embodiment of the invention has a symmetrical structure, which achieves a compact structure and can correct coma, astigmatism and field curvature, thereby improving image quality.

[0071] The wide-angle lens of this invention employs ten lenses. By combining the shape of each lens, the positive and negative optical power, and reasonable parameter settings, the wide-angle lens can achieve a large aperture (FNO≤1.8), a large field of view (FOV≥160°), and high resolution (35 million pixels). At the same time, it also achieves at least one of the following beneficial effects: miniaturization, small size, low distortion (F-Theta distortion absolute value less than 5%), high relative illumination (RI≥50%), and no blurring at high and low temperatures.

[0072] The wide-angle lens of the present invention will be specifically described below with reference to four embodiments, accompanying drawings, and tables. In the various embodiments below, the aperture stop STO is referred to as one side, and the image plane IMA is referred to as another side.

[0073] The parameters for each embodiment that meets the above conditions are shown in Table 1 below:

[0074]

[0075] Table 1

[0076] In an embodiment of the present invention, the aspherical lens of the wide-angle lens satisfies the following formula:

[0077]

[0078] In the above formula, The height perpendicular to the optical axis is along the optical axis. The axial distance from the vertex to the surface at the location; This represents the curvature at the vertex of the aspherical surface. The conic coefficient; , , , , , , ...represent aspheric coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders, respectively.

[0079] Example 1

[0080] like Figure 1 The diagram shown is a schematic representation of the optical structure of a wide-angle lens according to Embodiment 1 of the present invention. In this embodiment:

[0081] The first lens L1 is a convex-concave lens with negative optical power.

[0082] The second lens L2 is a convex-concave lens with negative optical power.

[0083] The third lens L3 is a concave-convex lens with negative optical power.

[0084] The fourth lens, L4, is a convex-convex lens with positive optical power.

[0085] The fifth lens, L5, is a concave-convex lens with negative optical power.

[0086] The sixth lens, L6, is a convex-convex lens with positive optical power.

[0087] The seventh lens, L7, is a convex-concave lens with negative optical power.

[0088] The eighth lens, L8, is a convex-convex lens with positive optical power.

[0089] The ninth lens, L9, is a concave-convex lens with negative optical power.

[0090] The tenth lens, L10, is a convex-convex lens with positive optical power.

[0091] The seventh lens L7 and the eighth lens L8 are cemented together. The second lens L2, the fifth lens L5, and the tenth lens L10 are aspherical glass lenses, while the other lenses are spherical glass lenses.

[0092] In this embodiment, the radius of curvature R, thickness d, refractive index Nd, and Abbe number Vd of each surface of the wide-angle lens are shown in Table 2:

[0093]

[0094] Table 2

[0095] In this embodiment, the K-value and aspherical coefficient of the wide-angle lens are shown in Table 3:

[0096]

[0097] Table 3

[0098] Combination Figure 1 As shown in Tables 1-3 above, this embodiment uses ten lenses. By matching the shape of each lens with positive and negative optical power, and by setting reasonable parameters, the wide-angle lens can achieve a large aperture (FNO≤1.8), a large field of view (FOV≥160°), and high resolution (35 million pixels). At the same time, it can also achieve at least one of the following beneficial effects: miniaturization, small size, low distortion (F-Theta distortion absolute value is less than 5%), high relative illumination (RI≥50%), and no blurring at high and low temperatures.

[0099] Example 2

[0100] like Figure 2 The diagram shown is a schematic representation of the optical structure of a wide-angle lens according to Embodiment 2 of the present invention. In this embodiment:

[0101] The first lens L1 is a convex-concave lens with negative optical power.

[0102] The second lens L2 is a convex-concave lens with negative optical power.

[0103] The third lens, L3, is a convex-concave lens with negative optical power.

[0104] The fourth lens, L4, is a convex-convex lens with positive optical power.

[0105] The fifth lens, L5, is a concave-convex lens with negative optical power.

[0106] The sixth lens, L6, is a convex-convex lens with positive optical power.

[0107] The seventh lens, L7, is a convex-convex lens with positive optical power.

[0108] The eighth lens, L8, is a concave-convex lens with negative optical power.

[0109] The ninth lens, L9, is a convex-concave lens with negative optical power.

[0110] The tenth lens, L10, is a convex-convex lens with positive optical power.

[0111] The third lens L3 and the fourth lens L4 are cemented together, and the seventh lens L7 and the eighth lens L8 are cemented together. The second lens L2, the fifth lens L5, and the tenth lens L10 are aspherical glass lenses, while the other lenses are spherical glass lenses.

[0112] In this embodiment, the radius of curvature R, thickness d, refractive index Nd, and Abbe number Vd of each surface of the wide-angle lens are shown in Table 4:

[0113]

[0114] Table 4

[0115] In this embodiment, the K-value and aspherical coefficient of the wide-angle lens are shown in Table 5:

[0116]

[0117] Table 5

[0118] Combination Figure 2 As shown in Tables 1 and 4-5 above, this embodiment uses ten lenses. By matching the shape of each lens with its positive and negative optical power, and by setting reasonable parameters, the wide-angle lens can achieve a large aperture (FNO≤1.8), a large field of view (FOV≥160°), and high resolution (35 million pixels). At the same time, it also takes into account at least one of the following beneficial effects: miniaturization, small size, low distortion (F-Theta distortion absolute value is less than 5%), high relative illumination (RI≥50%), and no blurring at high and low temperatures.

[0119] Example 3

[0120] like Figure 3 The diagram shown is a schematic representation of the optical structure of a wide-angle lens according to Embodiment 3 of the present invention. In this embodiment:

[0121] The first lens L1 is a convex-concave lens with negative optical power.

[0122] The second lens L2 is a concave lens with negative optical power.

[0123] The third lens, L3, is a convex-concave lens with negative optical power.

[0124] The fourth lens, L4, is a convex-convex lens with positive optical power.

[0125] The fifth lens, L5, is a concave-convex lens with negative optical power.

[0126] The sixth lens, L6, is a convex-convex lens with positive optical power.

[0127] The seventh lens, L7, is a convex-concave lens with negative optical power.

[0128] The eighth lens, L8, is a convex-convex lens with positive optical power.

[0129] The ninth lens, L9, is a concave-convex lens with negative optical power.

[0130] The tenth lens, L10, is a convex-convex lens with positive optical power.

[0131] The third lens L3 and the fourth lens L4 are cemented together, and the seventh lens L7 and the eighth lens L8 are cemented together. The second lens L2, the fifth lens L5, and the tenth lens L10 are aspherical glass lenses, while the other lenses are spherical glass lenses.

[0132] In this embodiment, the radius of curvature R, thickness d, refractive index Nd, and Abbe number Vd of each surface of the wide-angle lens are shown in Table 6:

[0133]

[0134] Table 6

[0135] In this embodiment, the K-value and aspherical coefficient of the wide-angle lens are shown in Table 7:

[0136]

[0137] Table 7

[0138] Combination Figure 3 As shown in Tables 1 and 6-7 above, this embodiment uses ten lenses. By matching the shape of each lens with its positive and negative optical power, and by setting reasonable parameters, the wide-angle lens can achieve a large aperture (FNO≤1.8), a large field of view (FOV≥160°), and high resolution (35 million pixels). At the same time, it also takes into account at least one of the following beneficial effects: miniaturization, small size, low distortion (F-Theta distortion absolute value is less than 5%), high relative illumination (RI≥50%), and no blurring at high and low temperatures.

[0139] Example 4

[0140] like Figure 4 The image shown is a schematic diagram of the optical structure of a wide-angle lens according to Embodiment 4 of the present invention. In this embodiment:

[0141] The first lens L1 is a convex-concave lens with negative optical power.

[0142] The second lens L2 is a convex-concave lens with negative optical power.

[0143] The third lens, L3, is a convex-concave lens with negative optical power.

[0144] The fourth lens, L4, is a convex-convex lens with positive optical power.

[0145] The fifth lens, L5, is a concave-convex lens with negative optical power.

[0146] The sixth lens, L6, is a convex-convex lens with positive optical power.

[0147] The seventh lens, L7, is a convex-convex lens with positive optical power.

[0148] The eighth lens, L8, is a concave-convex lens with negative optical power.

[0149] The ninth lens, L9, is a concave-convex lens with negative optical power.

[0150] The tenth lens, L10, is a convex-convex lens with positive optical power.

[0151] The third lens L3 and the fourth lens L4 are cemented together, and the seventh lens L7 and the eighth lens L8 are cemented together. The second lens L2, the fifth lens L5, the sixth lens L6, and the tenth lens L10 are glass aspherical lenses, and the other lenses are glass spherical lenses.

[0152] In this embodiment, the radius of curvature R, thickness d, refractive index Nd, and Abbe number Vd of each surface of the wide-angle lens are shown in Table 8:

[0153]

[0154] Table 8

[0155] In this embodiment, the K-value and aspherical coefficient of the wide-angle lens are shown in Table 9:

[0156]

[0157] Table 9

[0158] Combination Figure 4 As shown in Tables 1 and 8-9 above, this embodiment uses ten lenses. By matching the shape of each lens with its positive and negative optical power, and by setting reasonable parameters, the wide-angle lens can achieve a large aperture (FNO≤1.8), a large field of view (FOV≥160°), and high resolution (35 million pixels). At the same time, it can also achieve at least one of the following beneficial effects: miniaturization, small size, low distortion (F-Theta distortion absolute value is less than 5%), high relative illumination (RI≥50%), and no blurring at high and low temperatures.

[0159] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wide-angle lens, comprising, in sequence along the optical axis from the object side to the image side, a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), a fifth lens (L5), a sixth lens (L6), a seventh lens (L7), an eighth lens (L8), a ninth lens (L9), and a tenth lens (L10), totaling ten lenses with optical power, characterized in that, The first lens (L1), the second lens (L2), the third lens (L3), the fifth lens (L5), and the ninth lens (L9) have negative optical power; The fourth lens (L4), the sixth lens (L6), and the tenth lens (L10) have positive optical power; The seventh lens (L7) and the eighth lens (L8) have opposite optical powers; The focal length F1 of the first lens (L1), the radius of curvature R11 of the object-side surface of the first lens (L1), and the radius of curvature R12 of the image-side surface of the first lens (L1) satisfy: -2.2 <F1 / R11+F1 / R12<-1.3。 2. The wide-angle lens according to claim 1, characterized in that, The first lens (L1) is a convex-concave lens; The image-side surfaces of the second lens (L2), the third lens (L3), and the ninth lens (L9) are concave; The fourth lens (L4), the sixth lens (L6), and the tenth lens (L10) are convex-convex lenses; The fifth lens (L5) is a concave-convex lens; The object-side surface of the seventh lens (L7) is convex; The image-side surface of the eighth lens (L8) is convex.

3. The wide-angle lens according to claim 1 or 2, characterized in that, The maximum aperture D1 of the first lens (L1) and the effective focal length F1 of the first lens (L1) satisfy: -2.5 <D1 / F1<-1.7。 4. The wide-angle lens according to claim 1 or 2, characterized in that, The effective focal length F1 of the first lens (L1) and the total effective focal length F of the wide-angle lens satisfy: -2.5 <F1 / F<-1。 5. The wide-angle lens according to claim 1 or 2, characterized in that, The effective focal length F2 of the second lens (L2) and the total effective focal length F of the wide-angle lens satisfy: -5 <F2 / F<-2。 6. The wide-angle lens according to claim 1 or 2, characterized in that, The combined focal length F12 of the first lens (L1) and the second lens (L2) satisfies -1.6 with the total effective focal length F of the wide-angle lens. <F12 / F<-0.5。 7. The wide-angle lens according to claim 1 or 2, characterized in that, The absolute values ​​of the distance d5 between the image side of the fifth lens (L5) and the aperture stop on the optical axis and the total optical length TTL of the wide-angle lens satisfy: 0 < |d5 / TTL| < 0.

1.

8. The wide-angle lens according to claim 1 or 2, characterized in that, The effective focal length F5 of the fifth lens (L5) and the total effective focal length F of the wide-angle lens satisfy: -7 <F5 / F<-2。 9. The wide-angle lens according to claim 1 or 2, characterized in that, The effective focal length F6 of the sixth lens (L6) and the total effective focal length F of the wide-angle lens satisfy: 1.7 <F6 / F<3。 10. The wide-angle lens according to claim 1 or 2, characterized in that, The effective focal length F9 of the ninth lens (L9) and the total effective focal length F of the wide-angle lens satisfy: -3.5 <F9 / F<-1。 11. The wide-angle lens according to claim 1 or 2, characterized in that, The combined focal length Fa of the first lens (L1) to the fifth lens (L5) satisfies -2.8 with the total effective focal length F of the wide-angle lens. <Fa / F<-1。 12. The wide-angle lens according to claim 1 or 2, characterized in that, The combined focal length Fb of the sixth lens (L6) to the tenth lens (L10) and the total effective focal length F of the wide-angle lens satisfy: 1.5 <Fb / F<2.5。 13. The wide-angle lens according to claim 1 or 2, characterized in that, The combined focal length Fa of the first lens (L1) to the fifth lens (L5) and the combined focal length Fb of the sixth lens (L6) to the tenth lens (L10) satisfy: -1.2 <Fa / Fb<-0.5。 14. The wide-angle lens according to claim 1 or 2, characterized in that, The maximum aperture D of the wide-angle lens, the total optical length TTL of the wide-angle lens, and the half-image height H of the wide-angle lens satisfy: 0 <D / TTL / H<0.2。 15. The wide-angle lens according to claim 1 or 2, characterized in that, The back focal length (BFL) and total optical length (TTL) of the wide-angle lens satisfy: 0.1 <BFL / TTL<0.3。 16. The wide-angle lens according to claim 1 or 2, characterized in that, The combined effective focal length F34 of the third lens (L3) and the fourth lens (L4) satisfies the same condition as the effective focal length F of the wide-angle lens: 1.

5. <F34 / F<2.8。 17. The wide-angle lens according to claim 1 or 2, characterized in that, The effective focal length F4 of the fourth lens (L4) and the radius of curvature R42 of the image-side surface of the fourth lens (L4) satisfy: -0.9 <F4 / R42<1.2。 18. The wide-angle lens according to claim 1 or 2, characterized in that, The effective focal length F5 of the fifth lens (L5) and the effective focal length F6 of the sixth lens (L6) satisfy: -2.8 <F5 / F6<-0.8。 19. The wide-angle lens according to claim 1 or 2, characterized in that, The combined effective focal length F78 of the seventh lens (L7) and the eighth lens (L8) and the effective focal length F of the wide-angle lens satisfy: 2.6 <F78 / F<7.9。 20. The wide-angle lens according to claim 1 or 2, characterized in that, The effective focal length F10 of the tenth lens (L10) and the effective focal length F of the wide-angle lens satisfy: 2.0 <F10 / F<3.7。 21. The wide-angle lens according to claim 1 or 2, characterized in that, The radius of curvature R101 of the object side of the tenth lens (L10), the radius of curvature R102 of the image side of the tenth lens (L10), and the effective focal length F of the wide-angle lens satisfy: -0.5 < (R101 + R102) / F < 1.

1.

22. The wide-angle lens according to claim 1 or 2, characterized in that, The effective focal length F of the wide-angle lens and the entrance pupil diameter ENPD of the wide-angle lens satisfy: 1.6 <F / ENPD<1.9。 23. The wide-angle lens according to claim 1 or 2, characterized in that, The radius of curvature R31 of the object side and the radius of curvature R32 of the image side of the third lens (L3) satisfy: -2.6<(R31-R32) / (R31+R32)<0.

9.

24. The wide-angle lens according to claim 1 or 2, characterized in that, The radius of curvature R71 of the object side and the radius of curvature R72 of the image side of the seventh lens (L7) satisfy: 0.1 < (R71-R72) / (R71+R72) < 3.0.

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