Optical lens

Abstract

The invention relates to an optical lens in a direction from an object side to an image side along an optical axis. The invention relates to a multi-lens zoom lens, which comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with negative focal power and a ninth lens with negative focal power in sequence, and is characterized in that the first lens with negative focal power, the second lens with negative focal power, the third lens with positive focal power, the fourth lens with negative focal power, the fifth lens with positive focal power, the sixth lens with negative focal power, the seventh lens with positive focal power and the ninth lens with negative focal power are included; the focal power of the tenth lens is positive; and the focal power of the eleventh lens is positive. The optical lens provided by the invention at least has one of the characteristics of large aperture (F1.2), capability of realizing infrared confocal, 2K high image quality, support of dual-optical-path imaging, distance measurement and the like.

Description

Technical Field

[0001] The present invention relates to the field of imaging lens technology, and in particular to an optical lens having one of the following characteristics: large aperture, infrared confocality, 2K high image quality, and support for dual-light path imaging and ranging. Background Art

[0002] In many observation application scenarios, accurate observation of object details is crucial. However, due to the small object field angle in practical applications, it is urgent to have a lens with a longer focal length. A telephoto lens can focus on a specific area, magnify distant objects, and allow observers to clearly capture the subtle details of the object, greatly improving the accuracy of observation.

[0003] At the same time, in actual use environments, we often encounter situations with insufficient lighting, such as night scenes, dusk, and rainy days. In order to obtain clear images under these conditions, the requirement for a large aperture arises.

[0004] In order to meet the needs of nighttime observation, infrared confocal technology becomes the key. At night, the lack of visible light greatly reduces the observation effect of traditional lenses.

[0005] Furthermore, in order to achieve the functions of simultaneous imaging and distance measurement, the requirement of long back focus is indispensable. Long back focus can reserve enough space behind the lens, which is conducive to the dual-light path imaging design of the optical system and also helps to achieve distance measurement, providing important data support for subsequent analysis and decision-making.

[0006] The optical lenses on the market today still have the following shortcomings:

[0007] 1. Existing optical lenses cannot provide both large aperture and high image quality;

[0008] 2. It is difficult to correct the chromatic aberration of existing optical lenses, making it difficult to achieve infrared confocality;

[0009] 3. Existing optical lenses have both short overall length and long back focus.

[0010] Therefore, designing an optical lens with one of the following characteristics: large aperture, infrared confocality, and 2K high image quality has become a market development trend. Summary of the invention

[0011] In order to solve the problems existing in the above-mentioned prior art, the object of the present invention is to provide an optical lens having at least one of the characteristics of large aperture, infrared confocality, 2K high image quality, etc.

[0012] To achieve the above-mentioned object, the present invention provides an optical lens, which comprises, in order from the object side to the image side along the optical axis:

[0013] A first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, a seventh lens with positive optical power, an eighth lens with negative optical power, a ninth lens with negative optical power, a tenth lens with positive optical power and an eleventh lens with positive optical power.

[0014] According to a technical solution of the present invention, the first lens is a convex-concave lens, the second lens is a concave-convex lens, the third lens is a convex-concave lens, the image side surface of the fourth lens is a concave surface, the image side surface of the fifth lens is a convex surface, the sixth lens is a concave-concave lens, the seventh lens is a convex-convex lens, and the eighth lens is a concave-convex lens.

[0015] According to a technical solution of the present invention, the ninth lens is a convex-concave lens, the object-side surface of the tenth lens is a convex surface, and the object-side surface of the eleventh lens is a convex surface.

[0016] According to a technical solution of the present invention, the fifth lens and the sixth lens form a first doublet lens.

[0017] According to a technical solution of the present invention, the seventh lens and the eighth lens form a second doublet lens.

[0018] According to a technical solution of the present invention, the ninth lens and the tenth lens form a third doublet lens.

[0019] According to a technical solution of the present invention, the maximum full aperture Dmax of the optical lens and the total optical length TTL satisfy the following relationship: 0.3≤Dmax / TTL≤0.4.

[0020] According to a technical solution of the present invention, the total optical length TTL and the effective focal length F of the optical lens satisfy the following relationship: 4.0≤TTL / F≤4.3.

[0021] According to a technical solution of the present invention, the total optical length TTL and the back focal length BFL of the optical lens satisfy the following relationship: 2.5≤TTL / BFL≤2.8.

[0022] According to a technical solution of the present invention, the effective focal length F1 of the first lens and the effective focal length F of the optical lens satisfy the following relationship: -5.4≤F1 / F≤-3.0.

[0023] According to a technical solution of the present invention, the effective focal length F2 of the second lens and the effective focal length F of the optical lens satisfy the following relationship: -4.3≤F2 / F≤-3.3.

[0024] According to a technical solution of the present invention, the effective focal length F3 of the third lens and the effective focal length F of the optical lens satisfy the following relationship: 1.2≤F3 / F≤2.3.

[0025] According to a technical solution of the present invention, the effective focal length F4 of the fourth lens and the effective focal length F of the optical lens satisfy the following relationship: -1.7≤F4 / F≤-0.7.

[0026] According to a technical solution of the present invention, the effective focal length F5 of the fifth lens and the effective focal length F of the optical lens satisfy the following relationship: 0.7≤F5 / F≤1.7.

[0027] According to a technical solution of the present invention, the effective focal length F6 of the sixth lens and the effective focal length F of the optical lens satisfy the following relationship: -1.0≤F6 / F≤-0.5.

[0028] According to a technical solution of the present invention, the effective focal length F7 of the seventh lens and the effective focal length F of the optical lens satisfy the following relationship: 0.85≤F7 / F≤1.00.

[0029] According to a technical solution of the present invention, the effective focal length F8 of the eighth lens and the effective focal length F of the optical lens satisfy the following relationship: -2.6≤F8 / F≤-1.7.

[0030] According to a technical solution of the present invention, the effective focal length F9 of the ninth lens and the effective focal length F of the optical lens satisfy the following relationship: -3.0≤F9 / F≤-1.6.

[0031] According to a technical solution of the present invention, the effective focal length F10 of the tenth lens and the effective focal length F of the optical lens satisfy the following relationship: 1.0≤F10 / F≤2.0.

[0032] According to a technical solution of the present invention, the effective focal length F11 of the eleventh lens and the effective focal length F of the optical lens satisfy the following relationship: 1.6≤F11 / F≤3.2.

[0033] According to a technical solution of the present invention, the combined focal length Fa of the fifth lens and the sixth lens and the effective focal length F of the optical lens satisfy the following relationship: -4.2≤Fa / F≤-1.3.

[0034] According to a technical solution of the present invention, the combined focal length Fb of the seventh lens and the eighth lens and the effective focal length F of the optical lens satisfy the following relationship: 1.3≤Fb / F≤1.8.

[0035] According to a technical solution of the present invention, the combined focal length Fc of the ninth lens and the tenth lens and the effective focal length F of the optical lens satisfy the following relationship: 1.6≤Fc / F≤6.0.

[0036] According to a technical solution of the present invention, the combined focal length FI of the first lens to the sixth lens and the effective focal length F of the optical lens satisfy the following relationship: -1.0≤FI / F≤-0.5.

[0037] According to a technical solution of the present invention, the combined focal length FII of the seventh lens to the eleventh lens and the effective focal length F of the optical lens satisfy the following relationship: 0.6≤FII / F≤1.0.

[0038] According to a technical solution of the present invention, the combined focal length FI of the first lens to the sixth lens and the combined focal length FII of the seventh lens to the eleventh lens satisfy the following relationship: -1.2≤FI / FII≤-0.6.

[0039] According to a technical solution of the present invention, the optical lens satisfies at least one of the following conditions:

[0040] 0.3≤Dmax / TTL≤0.4,

[0041] 4.0≤TTL / F≤4.1,

[0042] 2.55≤TTL / BFL≤2.75,

[0043] -5.1≤F1 / F≤-3.3,

[0044] -4.15≤F2 / F≤-3.45,

[0045] 1.4≤F3 / F≤2.1,

[0046] -1.5≤F4 / F≤-0.9,

[0047] 0.9≤F5 / F≤1.3,

[0048] -0.9≤F6 / F≤-0.6,

[0049] 0.85≤F7 / F≤1.00,

[0050] -2.4≤F8 / F≤-1.85,

[0051] -2.85≤F9 / F≤-1.8,

[0052] 1.2≤F10 / F≤1.8,

[0053] 1.8≤F11 / F≤3,

[0054] -4≤Fa / F≤-1.48,

[0055] 1.4≤Fb / F≤1.7,

[0056] 2≤Fc / F≤5.68,

[0057] -0.85≤FI / F≤-0.65,

[0058] 0.75≤FII / F≤0.9,

[0059] -1.05≤FI / FII≤-0.8,

[0060] Wherein, Dmax is the maximum full aperture of the optical lens, TTL is the total optical length of the optical lens, F is the effective focal length of the optical lens, BFL is the back focal length of the optical lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, F7 is the effective focal length of the seventh lens, F8 is the effective focal length of the eighth lens, F9 is the effective focal length of the ninth lens, F10 is the effective focal length of the tenth lens, F11 is the effective focal length of the eleventh lens, Fa is the combined focal length of the fifth lens and the sixth lens, Fb is the combined focal length of the seventh lens and the eighth lens, Fc is the combined focal length of the ninth lens and the tenth lens, FI is the combined focal length of the first lens to the sixth lens, and FII is the combined focal length of the seventh lens to the eleventh lens.

[0061] According to the solution of the present invention, by setting the optical lens to include eleven lenses, and setting the optical powers of the first lens to the eighth lens to be negative power, negative power, positive power, negative power, positive power, negative power, positive power, negative power, negative power, positive power, negative power, negative power, positive power, and positive power respectively, the present invention can take into account both large aperture and high image quality, and short total length and long back focus, so that the optical lens has at least one of the characteristics of large aperture (F1.2), infrared confocality, 2K high image quality, support for dual-light path imaging and ranging. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0063] Figure 1 Schematic diagram of the structure of the optical lens of the first embodiment of the present invention;

[0064] Figure 2 is a relative illumination diagram of the optical lens of Example 1 of the present invention;

[0065] Figure 3 is a transverse light fan diagram of the optical lens of Example 1 of the present invention;

[0066] Figure 4 Schematic diagram of the structure of the optical lens of the second embodiment of the present invention;

[0067] Figure 5 is a relative illumination diagram of the optical lens of Example 2 of the present invention;

[0068] Figure 6 is a transverse light fan diagram of the optical lens of Example 2 of the present invention;

[0069] Figure 7 Schematic diagram of the structure of the optical lens of Embodiment 3 of the present invention;

[0070] Figure 8 is a relative illumination diagram of the optical lens of Example 3 of the present invention;

[0071] Fig. 9 is a transverse light fan diagram of the optical lens of Example 3 of the present invention;

[0072] Fig.10 Schematic diagram of the structure of an optical lens according to Embodiment 4 of the present invention;

[0073] Fig.11 is a relative illumination diagram of the optical lens of Example 4 of the present invention;

[0074] Fig.12 This is a transverse light fan diagram of the optical lens of Example 4 of the present invention. DETAILED DESCRIPTION

[0075] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0076] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the first lens.

[0077] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0078] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface 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 position of the concave surface 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 of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0079] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0080] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0081] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following examples only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for those of ordinary skill in the art, without departing from the concept of the present application, several variations and improvements can also be made, which all belong to the protection scope of the present application.

[0082] like Figures 1 to 12 As shown, an embodiment of the present invention provides an optical lens, which includes, in sequence from the object side to the image side of the optical axis: a first lens L1, a second lens L2, a third lens L3, an aperture STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11 and a protective flat glass CG.

[0083] The first lens L1 has negative optical power, which is beneficial to expand the incident light of the rear optical lens, correct the aberration of large-diameter light, and achieve a large aperture;

[0084] The first lens L1 is located in the first piece and is a convex-concave meniscus lens, which is beneficial to reduce the incident angle of the axial light, reduce the generation of spherical aberration, and help reduce tolerance sensitivity;

[0085] Furthermore, the first lens L1 can be made of a material with positive anomalous dispersion and a large value, such as FK / ZPK series materials with low refractive index and high Abbe number, or ZF series materials with high refractive index and low Abbe number, which is conducive to wide-spectrum apochromatism and achieving infrared confocality.

[0086] The second lens L2 has negative power, shares the negative power of the first lens L1, reduces the surface curvature, reduces the generation of aberrations, and is conducive to achieving high image quality;

[0087] The first lens L1 and the second lens L2 are used together, and the combined focal length has a large negative focal length, which is conducive to expanding the incident light of the rear optical lens, correcting the aberration of large-diameter light, and achieving a large aperture;

[0088] The first lens L1 and the second lens L2 are symmetrical meniscus-shaped and are located at the front end of the lens, farthest from the aperture, introducing off-axis aberrations such as astigmatism and coma, which is beneficial to balancing the aberration of light in a large field of view and achieving a large target surface.

[0089] The third lens L3 has positive focal power, which converges the light of the optical lens, is beneficial to correct the high-order aberration of the optical lens and achieve a large aperture;

[0090] The object side surface of the third lens L3 is convex, and positive spherical aberration is introduced to balance the negative spherical aberration produced by the first lens L1 and the second lens L2, which is conducive to achieving high image quality;

[0091] The image side surface of the third lens L3 is concave, which is beneficial to reduce the incident angle of the axial light, reduce the generation of spherical aberration, and reduce the tolerance sensitivity;

[0092] The third lens L3 can be made of a high refractive index material to increase the positive focal length and reduce the surface curvature, which is beneficial to reduce the generation of aberrations and achieve high image quality.

[0093] The third lens L3 can be made of a material with positive anomalous dispersion and a large value, which is conducive to apochromatization of a wide spectrum and achieving infrared confocality.

[0094] The fourth lens L4 has negative optical power, which is beneficial to expand the incident light of the rear system, correct the aberration of large-diameter light, and achieve a large aperture;

[0095] The image side surface of the fourth lens L4 is concave, and negative spherical aberration is introduced to balance the positive spherical aberration generated by the third lens L3, which is beneficial to achieving high image quality; when the object side surface and the image side surface of the fourth lens L4 are both concave, the optical power can be shared, the surface curvature can be reduced, and the generation of aberrations can be reduced, which is beneficial to achieving high image quality; when the object side surface of the fourth lens L4 is convex, it is beneficial to reduce the incident angle of the axial light, reduce the generation of spherical aberration, and reduce the tolerance sensitivity;

[0096] The fourth lens L4 can be made of a material with negative anomalous dispersion and a small value, such as TF series materials, which is conducive to wide-spectrum apochromatism and achieving infrared confocality.

[0097] The fifth lens L5 and the sixth lens L6 form a first double-cemented lens, the fifth lens L5 has positive power in the first double-cemented lens, and the sixth lens L6 has negative power in the first double-cemented lens. The fifth lens L5 and the sixth lens L6 cooperate to achieve apochromatism, which is beneficial to achieving high image quality; when the object-side surface and the image-side surface of the fifth lens L5 are both convex, the power is shared, the surface curvature is reduced, and the generation of aberrations is reduced, which is beneficial to achieving high image quality; or when the object-side surface of the fifth lens L5 is a plane, the incident angle of the axial light is reduced, the generation of spherical aberration is reduced, and it is beneficial to achieving high image quality;

[0098] The fifth lens L5 can be made of a material with positive anomalous dispersion and a large value, which is conducive to apochromatization of a wide spectrum and achieving infrared confocality.

[0099] The object-side surface and the image-side surface of the sixth lens L6 are both negative, which share the optical power, reduce the surface curvature, reduce the generation of aberrations, and are conducive to achieving high image quality.

[0100] The seventh lens L7 and the eighth lens L8 form a second double-cemented lens. The seventh lens L7 has positive power in the second double-cemented lens. The eighth lens L8 has negative power in the second double-cemented lens. The seventh lens L7 and the eighth lens L8 cooperate to achieve apochromatism, which is beneficial to achieving high image quality.

[0101] The object side surface and the image side surface of the seventh lens L7 are both convex, which share the optical power, reduce the surface curvature, reduce the generation of aberrations, and are conducive to achieving high image quality;

[0102] The seventh lens L7 can be made of a material with positive anomalous dispersion and a large value, which is conducive to apochromatization of a wide spectrum and achieving infrared confocality.

[0103] The eighth lens L8 is a meniscus lens, which is beneficial to reducing the incident angle of the axial light, reducing the generation of spherical aberration, and reducing tolerance sensitivity.

[0104] The ninth lens L9 and the tenth lens L10 form a third double-cemented lens. The ninth lens L9 has negative power in the third double-cemented lens. The tenth lens L10 has positive power in the third double-cemented lens. The ninth lens L9 and the tenth lens L10 cooperate to achieve apochromatism, which is beneficial to achieving high image quality.

[0105] The ninth lens L9 is a convex-concave lens, which effectively controls the trend of light, is beneficial to reducing the incident angle of axial light, reduces the generation of spherical aberration, and is beneficial to reducing tolerance sensitivity.

[0106] The object side of the tenth lens L10 is convex and the image side is concave, which effectively controls the light trend, helps to reduce the incident angle of the axial light, reduces the generation of spherical aberration, and helps to reduce tolerance sensitivity;

[0107] The object side surface and the image side surface of the tenth lens L10 are both convex, which share the optical power, reduce the surface curvature, reduce the generation of aberrations, and are conducive to achieving high image quality;

[0108] The tenth lens L10 can be made of a material with positive anomalous dispersion and a large value, which is conducive to apochromatization of a wide spectrum and realization of infrared confocality.

[0109] The eleventh lens L11 has positive refractive power, and forms a rear lens group with relatively large positive refractive power together with the seventh lens L7, the eighth lens L8, the ninth lens L9 and the tenth lens L10, and forms an anti-telephoto structure with the front lens group (the first lens L1 to the sixth lens L6), which is beneficial to increasing the back focus and providing structural space for realizing spectroscopic ranging;

[0110] The object side surface of the eleventh lens L11 is convex, which is beneficial to reducing the generation of spherical aberration and achieving high image quality of the lens.

[0111] By controlling the size of the system entrance pupil diameter, the system has a smaller aperture value, which is conducive to achieving a large aperture, so that the aperture value can reach between F1.0 and F1.3.

[0112] In some embodiments of the present invention, the maximum full aperture Dmax of the optical lens and the total optical length TTL satisfy the following relationship: 0.3≤Dmax / TTL≤0.4. Under a certain total optical length, the maximum full aperture of the system is controlled to make the maximum full aperture of the system smaller, which is conducive to miniaturization.

[0113] In some embodiments of the present invention, the total optical length TTL of the optical lens and the effective focal length F satisfy the following relationship: 4.0≤TTL / F≤4.3, preferably, 4.0≤TTL / F≤4.1. Under a certain focal length value, by controlling the total optical length of the optical lens, the total optical length of the system is reduced, which is conducive to miniaturization.

[0114] In some embodiments of the present invention, the total optical length TTL and the back focal length BFL of the optical lens satisfy the following relationship: 2.5≤TTL / BFL≤2.8, preferably, 2.55≤TTL / BFL≤2.75. On the basis of achieving miniaturization, by controlling the optical back focal length of the system, it is beneficial to ensure the long back focal length of the lens, and sufficient space can be reserved for the rear of the lens, which is beneficial to realize the dual-light path imaging design of the optical system and also helps to realize the distance measurement.

[0115] In some embodiments of the present invention, the effective focal length F1 of the first lens L1 and the effective focal length F of the optical lens satisfy the following relationship: -5.4≤F1 / F≤-3.0, preferably, -5.1≤F1 / F≤-3.3. By rationally allocating the focal length value of the first lens L1, it is beneficial to expand the incident light of the rear system, correct the aberration of large-diameter light, improve the resolution of the lens, and help achieve a large aperture.

[0116] In some embodiments of the present invention, the effective focal length F2 of the second lens L2 and the effective focal length F of the optical lens satisfy the following relationship: -4.3≤F2 / F≤-3.3, preferably, -4.15≤F2 / F≤-3.45. By reasonably allocating the focal length value of the second lens L2, the negative focal power of the first lens L1 is shared, the surface curvature is reduced, and the generation of aberrations is reduced, which is conducive to achieving high image quality.

[0117] In some embodiments of the present invention, the effective focal length F3 of the third lens L3 and the effective focal length F of the optical lens satisfy the following relationship: 1.2≤F3 / F≤2.3, preferably, 1.4≤F3 / F≤2.1. By rationally allocating the focal length value of the third lens L3, the system light is converged, which is beneficial to correcting the system high-order aberrations, improving the resolution performance of the lens, and helping to achieve a large aperture.

[0118] In some embodiments of the present invention, the effective focal length F4 of the fourth lens L4 and the effective focal length F of the optical lens satisfy the following relationship: -1.7≤F4 / F≤-0.7, preferably, -1.5≤F4 / F≤-0.9. By rationally allocating the focal length value of the fourth lens L4, it is beneficial to expand the incident light of the rear system, correct the aberration of large-diameter light, improve the resolution performance of the lens, and help achieve a large aperture.

[0119] In some embodiments of the present invention, the effective focal length F5 of the fifth lens L5 and the effective focal length F of the optical lens satisfy the following relationship: 0.7≤F5 / F≤1.7, preferably, 0.9≤F5 / F≤1.3. By reasonably allocating the focal length value of the fifth lens L5, so that it has positive focal power in the double-cemented lens, selecting a material with large anomalous dispersion, and cooperating with the sixth lens L6 to achieve achromatism, it is beneficial to achieve high image quality.

[0120] In some embodiments of the present invention, the effective focal length F6 of the sixth lens L6 and the effective focal length F of the optical lens satisfy the following relationship: -1.0≤F6 / F≤-0.5, preferably, -0.9≤F6 / F≤-0.6. By rationally allocating the focal length value of the sixth lens L6, it has a negative optical power in the double-cemented lens, and is conducive to achieving apochromatism and high image quality of the lens in conjunction with the fifth lens L5 with positive optical power.

[0121] In some embodiments of the present invention, the effective focal length F7 of the seventh lens L7 and the effective focal length F of the optical lens satisfy the following relationship: 0.85≤F7 / F≤1.00. By reasonably allocating the focal length value of the seventh lens L7 so that it has positive focal power in the double-cemented lens, selecting a material with large anomalous dispersion, and cooperating with the eighth lens L8 with negative focal power to achieve achromatism, it is beneficial to achieve high image quality.

[0122] In some embodiments of the present invention, the effective focal length F8 of the eighth lens L8 and the effective focal length F of the optical lens satisfy the following relationship: -2.6≤F8 / F≤-1.7, preferably, -2.4≤F8 / F≤-1.85. By reasonably allocating the focal length value of the eighth lens L8, it has a negative optical power in the double-cemented lens, and cooperates with the seventh lens L7 with a positive optical power to achieve achromatism, which is conducive to achieving high image quality.

[0123] In some embodiments of the present invention, the effective focal length F9 of the ninth lens L9 and the effective focal length F of the optical lens satisfy the following relationship: -3.0≤F9 / F≤-1.6, preferably, -2.85≤F9 / F≤-1.8. By reasonably allocating the focal length value of the ninth lens L9, it has a negative focal power in the double-cemented lens, and cooperates with the tenth lens L10 with a positive focal power to achieve achromatism, which is conducive to achieving high image quality.

[0124] In some embodiments of the present invention, the effective focal length F10 of the tenth lens L10 and the effective focal length F of the optical lens satisfy the following relationship: 1.0≤F10 / F≤2.0, preferably, 1.2≤F10 / F≤1.8. By reasonably allocating the focal length value of the tenth lens L10 so that it has positive focal power in the double-cemented lens, selecting a material with large anomalous dispersion, and cooperating with the ninth lens L9 with negative focal power to achieve apochromatism, it is beneficial to achieve high image quality.

[0125] In some embodiments of the present invention, the effective focal length F11 of the eleventh lens L11 and the effective focal length F of the optical lens satisfy the following relationship: 1.6≤F11 / F≤3.2, preferably, 1.8≤F11 / F≤3. By rationally allocating the focal length value of the eleventh lens L11 so that it has positive focal power and introduces negative spherical aberration, it is beneficial to correct the residual spherical aberration of the system and to achieve high image quality.

[0126] In some embodiments of the present invention, the combined focal length Fa of the fifth lens L5 and the sixth lens L6 and the effective focal length F of the optical lens satisfy the following relationship: -4.2≤Fa / F≤-1.3, preferably, -4≤Fa / F≤-1.48. By rationally allocating the focal length values ​​of the fifth lens L5 and the sixth lens L6 of the double-cemented lens and combining with a larger clear aperture, it is beneficial to correct the axial chromatic aberration of a large aperture, improve the lens quality, and help achieve a large aperture.

[0127] In some embodiments of the present invention, the combined focal length Fb of the seventh lens L7 and the eighth lens L8 and the effective focal length F of the optical lens satisfy the following relationship: 1.3≤Fb / F≤1.8, preferably, 1.4≤Fb / F≤1.7. By rationally allocating the focal length values ​​of the seventh lens L7 and the eighth lens L8 of the double cemented lens and combining with a larger clear aperture, it is beneficial to correct the axial chromatic aberration of a large aperture, improve the lens quality, and help achieve a large aperture.

[0128] In some embodiments of the present invention, the combined focal length Fc of the ninth lens L9 and the tenth lens L10 and the effective focal length F of the optical lens satisfy the following relationship: 1.6≤Fc / F≤6.0, preferably, 2≤Fc / F≤5.68. By reasonably allocating the focal length values ​​of the ninth lens L9 and the tenth lens L10 of the double-cemented lens, combined with a larger clear aperture, it is beneficial to correct the axial chromatic aberration of a large aperture, improve the lens quality, and help achieve a large aperture.

[0129] In some embodiments of the present invention, the combined focal length FI of the first lens L1 to the sixth lens L6 and the effective focal length F of the optical lens satisfy the following relationship: -1.0≤FI / F≤-0.5, preferably, -0.85≤FI / F≤-0.65;

[0130] The combined focal length FII of the seventh lens L7 to the eleventh lens L11 and the effective focal length F of the optical lens satisfy the following relationship: 0.6≤FII / F≤1.0, preferably, 0.75≤FII / F≤0.9;

[0131] The combined focal length FI of the first lens L1 to the sixth lens L6 and the combined focal length FII of the seventh lens L7 to the eleventh lens L11 satisfy the following relationship: -1.2≤FI / FII≤-0.6, preferably, -1.05≤FI / FII≤-0.8.

[0132] In some embodiments of the present invention, any lens of the optical lens of the present application can be a spherical lens or an aspherical lens. As needed, the present application does not specifically limit the specific number of spherical lenses and aspherical lenses. When focusing on imaging quality, the number of aspherical lenses can be increased, or even all lenses can use aspherical lenses. Exemplarily, the first lens to the eleventh lens in the present application are all spherical lenses.

[0133] In some embodiments of the present invention, the optical lens of the present application may be made of a glass-plastic hybrid material or a full glass material. An optical lens made of glass can suppress the deviation of the back focus of the optical lens with temperature changes to improve the stability of the system; at the same time, the use of glass material can avoid the blurring of the lens imaging caused by high and low temperature changes in the use environment, which affects the normal use of the lens, and can also better correct the chromatic aberration of the system, improve the resolution of the lens, and reduce the generation of ghost images. Using plastic to make optical lenses can effectively reduce production costs, and a reasonable combination of plastic lenses is conducive to the balance of high and low temperatures and the realization of infrared confocality. For example, in the present application, the first lens to the eleventh lens are all glass lenses, and the optical lens with a full glass design has a wider temperature range and can maintain stable optical performance in the range of -40°C to 85°C.

[0134] By reasonably allocating the combined focal length values ​​of the first lens L1 to the sixth lens L6 and the combined focal length values ​​of the seventh lens L7 to the eleventh lens L11, an anti-telephoto architecture is formed, which is beneficial to increasing the back focal length and providing sufficient structural space to realize the spectroscopic ranging of the lens.

[0135] Furthermore, a beam splitter plate is arranged behind the eleventh lens (on the image side), and the beam splitter plate may be a beam splitter. A protective glass and a ranging detector are arranged behind the beam splitter, and another protective glass and an image plane are arranged above or below the beam splitter to achieve synchronous imaging and ranging.

[0136] Four groups of specific embodiments are given below to specifically illustrate the optical lens according to the present invention based on the above configuration. The optical lens according to the present invention has eleven lenses in total, and each cemented surface of the cemented lens is recorded as one surface, plus the aperture STO, the protective glass CG and the image plane IMA / range detector, a total of 23 surfaces. Among them, the aperture STO is set between the eighth lens L8 and the ninth lens L9.

[0137] Four sets of example data are shown in Table 1 below:

[0138]

[0139]

[0140] Table 1

[0141] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0142] Embodiment 1

[0143] Figure 1 Schematic diagram of the structure of the optical lens of the first embodiment of the present invention;

[0144] Figure 2 is a relative illumination diagram of the optical lens of Example 1 of the present invention;

[0145] Figure 3 This is a lateral light fan diagram of the optical lens of Example 1 of the present invention.

[0146] In Embodiment 1, the first lens L1 is a convexo-concave lens with negative power, the second lens L2 is a convexo-concave lens with negative power, the third lens L3 is a convexo-concave lens with positive power, the fourth lens L4 is a convexo-concave lens with negative power, the fifth lens L5 is a convexo-convex lens with positive power, the sixth lens L6 is a convexo-concave lens with negative power, the seventh lens L7 is a convexo-convex lens with positive power, the eighth lens L8 is a convexo-convex lens with negative power, the ninth lens L9 is a convexo-concave lens with negative power, the tenth lens L10 is a convexo-concave / convex-planar lens with positive power, and the eleventh lens L11 is a convexo-concave lens with positive power.

[0147] The first lens L1 to the eleventh lens L11 are all spherical lenses; the aperture STO is arranged between the eighth lens L8 and the ninth lens L9.

[0148] Table 2 lists the relevant parameters of each lens in the optical lens of this embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd and Abbe number Vd of the material.

[0149]

[0150]

[0151] Table 2

[0152] Combination Figures 1 to 3 As shown in Tables 1 and 2 above, in Example 1, the effective focal length F of the optical lens is 31 mm, the total optical length is 125 mm, and the aperture number Fno is 1.22.

[0153] The first embodiment of the present invention is an optical lens having at least one of the following characteristics: large aperture (F1.2), infrared confocality, 2K high image quality, and support for dual-light path imaging and ranging.

[0154] Embodiment 2

[0155] Figure 4 Schematic diagram of the structure of the optical lens of the second embodiment of the present invention;

[0156] Figure 5 is a relative illumination diagram of the optical lens of Example 2 of the present invention;

[0157] Figure 6 This is a transverse light fan diagram of the optical lens of Example 2 of the present invention.

[0158] In the second embodiment, the first lens L1 is a convexo-concave lens with negative power, the second lens L2 is a concave-convex lens with negative power, the third lens L3 is a convexo-concave lens with positive power, the fourth lens L4 is a concave-concave lens with negative power, the fifth lens L5 is a plano-convex lens with positive power, the sixth lens L6 is a concave-concave lens with negative power, the seventh lens L7 is a convexo-convex lens with positive power, the eighth lens L8 is a concave-convex lens with negative power, the ninth lens L9 is a convexo-concave lens with negative power, the tenth lens L10 is a convexo-convex lens with positive power, and the eleventh lens L11 is a convexo-concave lens with positive power.

[0159] The first lens L1 to the eleventh lens L11 are all spherical lenses; the aperture STO is arranged between the eighth lens L8 and the ninth lens L9.

[0160] Table 3 lists the relevant parameters of each lens in the optical lens of this embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd and Abbe number Vd of the material.

[0161] Surface serial number Surface type Curvature radius R Thickness d Refractive index Nd Abbe number Vd S1 Spherical 28.282 6.08 1.70 35.3 S2 Spherical 20.507 6.43 S3 Spherical -25.746 5.89 1.49 70.4 S4 Spherical -50.974 0.30 S5 Spherical 24.498 6.33 1.92 18.9 S6 Spherical 37.234 3.06 S7 Spherical -453.405 0.80 1.65 39.5 S8 Spherical 25.056 4.11 S9 Spherical Infinity 8.35 1.44 95.1 S10 Spherical -16.808 0.80 1.61 44.1 S11 Spherical 315.683 0.30 S12 Spherical 88.396 14.62 1.59 68.3 S13 Spherical -20.451 0.80 1.61 44.1 S14 Spherical -38.395 0.30 STO Spherical 0.300 42.26 S16 Spherical 143.787 0.80 1.74 30.5 S17 Spherical 33.181 12.42 1.59 68.3 S18 Spherical -69.930 0.30 S19 Spherical 42.880 6.30 1.74 44.9 S20 Spherical 535.839 45.05 S21 Spherical Infinity 0.70 1.52 64.2 S22 Spherical Infinity 1.00 IMA Spherical Infinity

[0162] Table 3

[0163] Combination Figures 4 to 6 As shown in Table 1 and Table 3 above, in Example 2, the effective focal length F of the optical lens is 31 mm, the total optical length is 125 mm, and the aperture number Fno is 1.22.

[0164] The second embodiment of the present invention is an optical lens having at least one of the following characteristics: large aperture (F1.2), infrared confocality, 2K high image quality, and support for dual-light path imaging and ranging.

[0165] Embodiment 3

[0166] Figure 7 Schematic diagram of the structure of the optical lens of Embodiment 3 of the present invention;

[0167] Figure 8 is a relative illumination diagram of the optical lens of Example 3 of the present invention;

[0168] Fig. 9 This is a transverse light fan diagram of the optical lens of Example 3 of the present invention.

[0169] In embodiment 3, the first lens L1 is a convexo-convex lens with negative power, the second lens L2 is a convexo-convex lens with negative power, the third lens L3 is a convexo-convex lens with positive power, the fourth lens L4 is a convexo-convex lens with negative power, the fifth lens L5 is a convexo-convex lens with positive power, the sixth lens L6 is a convexo-convex lens with negative power, the seventh lens L7 is a convexo-convex lens with positive power, the eighth lens L8 is a convexo-convex lens with negative power, the ninth lens L9 is a convexo-convex lens with negative power, the tenth lens L10 is a convexo-convex lens with positive power, and the eleventh lens L11 is a convexo-convex lens with positive power.

[0170] The first lens L1 to the eleventh lens L11 are all spherical lenses; the aperture STO is arranged between the eighth lens L8 and the ninth lens L9.

[0171] Table 4 lists the relevant parameters of each lens in the optical lens of this embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd and Abbe number Vd of the material.

[0172] Surface serial number Surface type Curvature radius R Thickness d Refractive index Nd Abbe number Vd S1 Spherical 35.280 0.80 1.49 70.4 S2 Spherical 22.236 7.24 S3 Spherical -27.208 2.62 1.50 61.6 S4 Spherical -51.431 0.30 S5 Spherical 27.149 10.28 1.92 20.9 S6 Spherical 46.160 1.85 S7 Spherical 167.378 0.80 1.65 39.5 S8 Spherical 25.082 3.87 S9 Spherical 263.024 9.85 1.44 95.1 S10 Spherical -16.555 0.80 1.65 39.5 S11 Spherical 66.102 0.55 S12 Spherical 76.742 14.83 1.59 68.3 S13 Spherical -20.124 0.80 1.58 41.6 S14 Spherical -40.644 0.30 STO Spherical Infinity 0.30 S16 Spherical 112.918 0.80 1.64 34.8 S17 Spherical 37.142 15.40 1.59 68.3 S18 Spherical -50.018 0.30 S19 Spherical 44.015 5.03 1.74 44.9 S20 Spherical 117.784 46.57 S21 Spherical Infinity 0.70 1.52 64.2 S22 Spherical Infinity 1.00 IMA Spherical Infinity

[0173] Table 4

[0174] Combination Figures 7 to 9 As shown in Table 1 and Table 4 above, in Example 3, the effective focal length F of the optical lens is 31 mm, the total optical length is 125 mm, and the aperture number Fno is 1.22.

[0175] The third embodiment of the present invention is an optical lens having at least one of the following characteristics: large aperture (F1.2), infrared confocality, 2K high image quality, and support for dual-light path imaging and ranging.

[0176] Embodiment 4

[0177] Fig.10 Schematic diagram of the structure of an optical lens according to Embodiment 4 of the present invention;

[0178] Fig.11 is a relative illumination diagram of the optical lens of Example 4 of the present invention;

[0179] Fig.12 This is a transverse light fan diagram of the optical lens of Example 4 of the present invention.

[0180] In embodiment 4, the first lens L1 is a convexo-concave lens with negative power, the second lens L2 is a concave-convex lens with negative power, the third lens L3 is a convexo-concave lens with positive power, the fourth lens L4 is a concave-concave lens with negative power, the fifth lens L5 is a convexo-convex lens with positive power, the sixth lens L6 is a concave-concave lens with negative power, the seventh lens L7 is a convexo-convex lens with positive power, the eighth lens L8 is a concave-convex lens with negative power, the ninth lens L9 is a convexo-concave lens with negative power, the tenth lens L10 is a convexo-convex-plano lens with positive power, and the eleventh lens L11 is a convexo-concave lens with positive power.

[0181] The first lens L1 to the eleventh lens L11 are all spherical lenses; the aperture STO is arranged between the eighth lens L8 and the ninth lens L9.

[0182] Table 5 lists the relevant parameters of each lens in the optical lens of this embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd and Abbe number Vd of the material.

[0183]

[0184]

[0185] Table 5

[0186] Combination Figures 10 to 12 As shown in Table 1 and Table 5 above, in Example 4, the effective focal length F of the optical lens is 31 mm, the total optical length is 125 mm, and the aperture number Fno is 1.22.

[0187] The fourth embodiment of the present invention is an optical lens having at least one of the following characteristics: large aperture (F1.2), being able to realize infrared confocal, 2K high image quality, supporting dual-light path imaging and ranging.

[0188] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims

1. An optical lens, characterized in that: Along the direction from the object side to the image side of the optical axis, it includes: A first lens (L1) with negative optical power, a second lens (L2) with negative optical power, a third lens (L3) with positive optical power, a fourth lens (L4) with negative optical power, a fifth lens (L5) with positive optical power, a sixth lens (L6) with negative optical power, a seventh lens (L7) with positive optical power, an eighth lens (L8) with negative optical power, a ninth lens (L9) with negative optical power, a tenth lens (L10) with positive optical power and an eleventh lens (L11) with positive optical power.

2. The optical lens according to claim 1, characterized in that: The first lens (L1) is a convex-concave lens, the second lens (L2) is a concave-convex lens, the third lens (L3) is a convex-concave lens, the image side surface of the fourth lens (L4) is a concave surface, the image side surface of the fifth lens (L5) is a convex surface, the sixth lens (L6) is a concave-concave lens, the seventh lens (L7) is a convex-convex lens, and the eighth lens (L8) is a concave-convex lens.

3. The optical lens according to claim 1, characterized in that: The ninth lens (L9) is a convex-concave lens, the object-side surface of the tenth lens (L10) is a convex surface, and the object-side surface of the eleventh lens (L11) is a convex surface.

4. The optical lens according to claim 1, characterized in that: The fifth lens (L5) and the sixth lens (L6) form a first doublet lens.

5. The optical lens according to claim 1, characterized in that: The seventh lens (L7) and the eighth lens (L8) form a second doublet lens.

6. The optical lens according to claim 1, characterized in that: The ninth lens (L9) and the tenth lens (L10) form a third doublet lens.

7. The optical lens according to any one of claims 1 to 6, characterized in that: The maximum full aperture Dmax of the optical lens and the total optical length TTL satisfy the following relationship: 0.3≤Dmax / TTL≤0.

4.

8. The optical lens according to any one of claims 1 to 6, characterized in that: The total optical length TTL and the effective focal length F of the optical lens satisfy the following relationship: 4.0≤TTL / F≤4.

3.

9. The optical lens according to any one of claims 1 to 6, characterized in that: The total optical length TTL and the back focal length BFL of the optical lens satisfy the following relationship: 2.5≤TTL / BFL≤2.

8.

10. The optical lens according to any one of claims 1 to 6, characterized in that: The effective focal length F1 of the first lens (L1) and the effective focal length F of the optical lens satisfy the following relationship: -5.4≤F1 / F≤-3.0.

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