Optical lens

Abstract

The utility model relates to an optical lens which is arranged along an optical axis from an object side to an image side. The utility model 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; the focal power of the eleventh lens is positive; the first lens is a convex-concave lens, and the eleventh lens is a convex-concave lens. The optical lens provided by the utility model at least has one of the characteristics of large aperture (F1.2), infrared confocal, 2K high image quality, support of dual-optical-path imaging, distance measurement and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of imaging lenses, and in particular to an optical lens having one of the characteristics of a large aperture, being able to realize infrared confocality, 2K high image quality, and supporting dual-light-path imaging and ranging. Background Art

[0002] Accurately observing object details is crucial in numerous observation applications. However, due to the narrow field of view in practical applications, a lens with a longer focal length is urgently needed. A long-focal-length lens can focus on a specific area, magnifying distant objects and allowing the observer to clearly capture the subtle details of the object, greatly improving observation accuracy.

[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, a long back focus is essential for achieving simultaneous imaging and ranging. This allows for ample space behind the lens, facilitating the dual-path imaging design of the optical system and aiding ranging, providing crucial 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 achieve both large aperture and high image quality;

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

[0009] 3. Existing optical lenses have both short total 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. Utility Model Content

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

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

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

[0014] The first lens is a convex-concave lens, and the object-side surface of the eleventh lens is a convex surface.

[0015] According to a technical solution of the present invention, the second lens is a meniscus 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 meniscus lens, the seventh lens is a convex-convex lens, and the eighth lens is a meniscus lens.

[0016] According to a technical solution of the present invention, the ninth lens is a convex-concave lens, and the object-side surface of the tenth lens is a convex surface.

[0017] According to a technical solution of the present invention, the fifth lens and the sixth lens form a first doublet lens.

[0018] According to a technical solution of the present invention, the seventh lens and the eighth lens form a second doublet lens.

[0019] According to a technical solution of the present invention, the ninth lens and the tenth lens form a third doublet lens.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] According to a technical solution of the present invention, the combined focal length FI of the first to sixth lenses and the combined focal length FII of the seventh to eleventh lenses satisfy the following relationship: -1.2≤FI / FII≤-0.6.

[0040] According to a technical solution of the present invention, the optical lens meets at least one of the following conditions:

[0041] 0.3≤Dmax / TTL≤0.4,

[0042] 4.0≤TTL / F≤4.1,

[0043] 2.55≤TTL / BFL≤2.75,

[0044] -4.55≤F1 / F≤-3.3,

[0045] -4.15≤F2 / F≤-3.45,

[0046] 1.4≤F3 / F≤2,

[0047] -1.5≤F4 / F≤-0.9,

[0048] 0.9≤F5 / F≤1.3,

[0049] -0.9≤F6 / F≤-0.6,

[0050] 0.85≤F7 / F≤1.00,

[0051] -2.3≤F8 / F≤-1.85,

[0052] -2.85≤F9 / F≤-1.8,

[0053] 1.2≤F10 / F≤1.8,

[0054] 1.8≤F11 / F≤3,

[0055] -4≤Fa / F≤-1.48,

[0056] 1.4≤Fb / F≤1.7,

[0057] 2≤Fc / F≤5.68,

[0058] -0.85≤FI / F≤-0.65,

[0059] 0.75≤FII / F≤0.9,

[0060] -1.05≤FI / FII≤-0.8,

[0061] 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.

[0062] 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, positive 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-optical path imaging and ranging. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0064] Figure 1 This is a schematic structural diagram of the optical lens of Example 1 of the present utility model;

[0065] Figure 2 This is a relative illumination diagram of the optical lens of Example 1 of the present utility model;

[0066] Figure 3 This is a transverse light fan diagram of the optical lens of Example 1 of the present utility model;

[0067] Figure 4 This is a schematic structural diagram of an optical lens according to a second embodiment of the present invention;

[0068] Figure 5 This is a relative illumination diagram of the optical lens of Example 2 of the present utility model;

[0069] Figure 6 This is a transverse light fan diagram of the optical lens of Example 2 of the present utility model;

[0070] Figure 7 This is a schematic structural diagram of an optical lens according to a third embodiment of the present invention;

[0071] Figure 8 This is a relative illumination diagram of the optical lens of Example 3 of the present utility model;

[0072] Figure 9 This is a transverse ray fan diagram of the optical lens of Example 3 of the present utility model;

[0073] Figure 10 Schematic diagram of the structure of the optical lens of Example 4 of the present utility model;

[0074] Figure 11 This is a relative illumination diagram of the optical lens of Example 4 of the present utility model;

[0075] Figure 12 This is a transverse light fan diagram of the optical lens of Example 4 of the present utility model. DETAILED DESCRIPTION

[0076] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely 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.

[0077] It should be noted that in this specification, the expressions first, second, third, etc. are only used to distinguish one feature from another, and do not represent any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the first lens.

[0078] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0079] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0080] 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 preclude 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 list of 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.

[0081] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0082] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The following examples only express several implementation methods of the present application, and their descriptions are relatively specific and detailed, but they should not be understood as limiting the scope of the patent application. It should be pointed out that for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all fall within the scope of protection of the present application.

[0083] like Figures 1 to 12 As shown, an embodiment of the present invention provides an optical lens, which includes, along the optical axis from the object side to the image side, in sequence: 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.

[0084] The first lens L1 has negative optical power, which is beneficial for expanding the incident light of the rear optical lens, correcting the aberration of large-diameter light, and achieving a large aperture;

[0085] The first lens L1 is located in the first element and is a convex-concave meniscus lens. It helps to reduce the incident angle of axial light, reduce the generation of spherical aberration, and help reduce tolerance sensitivity.

[0086] Furthermore, the first lens L1 can be made of a material with positive and large anomalous dispersion, 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.

[0087] The second lens L2 has negative power, which 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;

[0088] The first lens L1 and the second lens L2 are used together to have a large negative focal length, which is beneficial for expanding the incident light from the rear optical lens, correcting the aberration of large-diameter light, and achieving a large aperture;

[0089] 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. They introduce off-axis aberrations such as astigmatism and coma, which is beneficial for balancing the aberrations of light in a large field of view and at the same time conducive to achieving a large target area.

[0090] The third lens L3 has positive refractive power, which converges the light of the optical lens, helps correct the high-order aberrations of the optical lens and achieve a large aperture;

[0091] The object-side surface of the third lens L3 is convex, introducing positive spherical aberration to balance the negative spherical aberration produced by the first and second lenses L1 and L2, thus achieving high image quality.

[0092] The image-side surface of the third lens L3 is concave, which helps to reduce the incident angle of axial light, reduce the generation of spherical aberration, and help reduce tolerance sensitivity;

[0093] The third lens L3 can be made of a high refractive index material to increase the positive focal power and reduce the surface curvature, which is beneficial to reduce the generation of aberrations and achieve high image quality.

[0094] The third lens L3 can be made of a material with positive anomalous dispersion and a large value, which is conducive to wide-spectrum apochromatism and achieving infrared confocality.

[0095] The fourth lens L4 has negative optical power, which is beneficial for expanding the incident light from the rear system, correcting large-diameter light aberrations, and achieving a large aperture;

[0096] The image-side surface of the fourth lens element L4 is concave, introducing negative spherical aberration to balance the positive spherical aberration produced by the third lens element L3, thereby achieving high image quality. When both the object-side and image-side surfaces of the fourth lens element L4 are concave, they can share the optical power, reduce the surface curvature, and minimize aberrations, thereby achieving high image quality. When the object-side surface of the fourth lens element L4 is convex, it helps to reduce the incident angle of on-axis light, reduce the generation of spherical aberration, and help reduce tolerance sensitivity.

[0097] 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.

[0098] Fifth lens L5 and sixth lens L6 form a first doublet lens. Fifth lens L5 has positive refractive power in the first doublet lens, and sixth lens L6 has negative refractive power in the first doublet lens. The fifth lens L5 and sixth lens L6 can achieve apochromatism in combination, which is beneficial for achieving high image quality.

[0099] The object-side surface and image-side surface of the fifth lens L5 are both convex, which share the optical power, reduce the surface curvature, and reduce the generation of aberrations, which is conducive to achieving high image quality; or

[0100] The object-side surface of the fifth lens L5 is flat, which reduces the incident angle of on-axis light and reduces spherical aberration, thereby achieving high image quality.

[0101] The fifth lens L5 can be made of a material with positive anomalous dispersion and a large value, which is conducive to apochromatism over a wide spectrum and achieving infrared confocality.

[0102] The object-side surface and image-side surface of the sixth lens L6 are both negative, which share the optical power, reduce the surface curvature, and reduce the generation of aberrations, which is conducive to achieving high image quality.

[0103] Seventh lens L7 and eighth lens L8 form a second doublet lens. Seventh lens L7 has positive focal power in the second doublet lens, and eighth lens L8 has negative focal power in the second doublet lens. The seventh lens L7 and eighth lens L8 can achieve apochromatism in combination, which is beneficial for achieving high image quality.

[0104] The object-side and image-side surfaces of the seventh lens element L7 are both convex, which share the optical power, reduce the surface curvature, and minimize the generation of aberrations, which is conducive to achieving high image quality.

[0105] 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.

[0106] The eighth lens L8 is a meniscus lens, which is beneficial for reducing the incident angle of axial light, reducing the generation of spherical aberration, and reducing tolerance sensitivity.

[0107] Ninth lens L9 and tenth lens L10 form a third doublet lens. Ninth lens L9 has negative refractive power in the third doublet lens, and tenth lens L10 has positive refractive power in the third doublet lens. Ninth lens L9 and tenth lens L10 can achieve apochromatism in combination, which is beneficial for achieving high image quality.

[0108] The ninth lens element L9 is a convex-concave lens, which effectively controls the direction of light, helps to reduce the incident angle of on-axis light, reduces the generation of spherical aberration, and helps to reduce tolerance sensitivity.

[0109] The object-side surface of the tenth lens L10 is convex, and the image-side surface is concave, which effectively controls the direction of light, helps to reduce the incident angle of on-axis light, reduces the generation of spherical aberration, and helps to reduce tolerance sensitivity;

[0110] The object-side and image-side surfaces of the tenth lens L10 are both convex, which share the optical power, reduce the surface curvature, and minimize the generation of aberrations, which is conducive to achieving high image quality.

[0111] 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 achieving infrared confocality.

[0112] The eleventh lens L11 has positive refractive power and, together with the seventh lens L7, the eighth lens L8, the ninth lens L9, and the tenth lens L10, forms a rear lens group with relatively high positive refractive power. Together with the front lens group (the first lens L1 to the sixth lens L6), they form a reverse telephoto structure, which helps increase the back focus and provide structural space for spectroscopic ranging.

[0113] 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.

[0114] By controlling the size of the system's 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.

[0115] 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. By controlling the maximum full-aperture of the system for a given total optical length, the maximum full-aperture of the system can be reduced, facilitating miniaturization.

[0116] 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. By controlling the total optical length of the optical lens at a given focal length, the total optical length of the system can be reduced, facilitating miniaturization.

[0117] In some embodiments of the present invention, the total optical length (TTL) and back focus length (BFL) of the optical lens satisfy the following relationship: 2.5 ≤ TTL / BFL ≤ 2.8, preferably 2.55 ≤ TTL / BFL ≤ 2.75. While achieving miniaturization, controlling the system's optical back focus length helps ensure a long back focus, reserving sufficient space behind the lens, facilitating the implementation of a dual-optical imaging design for the optical system and facilitating distance measurement.

[0118] In some embodiments of the present invention, the effective focal length F1 of the first lens element L1 satisfies the following relationship with the effective focal length F of the optical lens: -5.4 ≤ F1 / F ≤ -3.0, preferably, -4.55 ≤ F1 / F ≤ -3.3. By rationally assigning the focal length of the first lens L1, incident light from the rear system can be expanded, aberrations of large-aperture light can be corrected, the resolution of the lens can be improved, and a large aperture can be achieved.

[0119] In some embodiments of the present invention, the effective focal length F2 of the second lens element L2 satisfies the following relationship with the effective focal length F of the optical lens: -4.3 ≤ F2 / F ≤ -3.3, preferably, -4.15 ≤ F2 / F ≤ -3.45. By rationally allocating the focal length of the second lens element L2, the negative power of the first lens element L1 is shared, surface curvature is reduced, and aberrations are minimized, thereby achieving high image quality.

[0120] In some embodiments of the present invention, the effective focal length F3 of the third lens L3 satisfies the following relationship with the effective focal length F of the optical lens: 1.2 ≤ F3 / F ≤ 2.3, preferably, 1.4 ≤ F3 / F ≤ 2. By rationally assigning the focal length of the third lens L3, the system's light rays are converged, which helps correct for higher-order aberrations, improves the lens's resolution, and facilitates achieving a large aperture.

[0121] In some embodiments of the present invention, the effective focal length F4 of the fourth lens element L4 satisfies the following relationship with the effective focal length F of the optical lens: -1.7 ≤ F4 / F ≤ -0.7, preferably, -1.5 ≤ F4 / F ≤ -0.9. By rationally assigning the focal length of the fourth lens element L4, incident light from the rear system can be expanded, aberrations of large-aperture light can be corrected, and the resolution of the lens can be improved, while also facilitating the realization of a large aperture.

[0122] In some embodiments of the present invention, the effective focal length F5 of the fifth lens element L5 satisfies the following relationship with the effective focal length F of the optical lens: 0.7 ≤ F5 / F ≤ 1.7, preferably 0.9 ≤ F5 / F ≤ 1.3. By rationally assigning the focal length of the fifth lens element L5 to achieve positive power in a doublet lens, selecting a material with high anomalous dispersion, and achieving apochromatism in conjunction with the sixth lens element L6, high image quality is achieved.

[0123] In some embodiments of the present invention, the effective focal length F6 of the sixth lens element L6 satisfies the following relationship with the effective focal length F of the optical lens: -1.0 ≤ F6 / F ≤ -0.5, preferably, -0.9 ≤ F6 / F ≤ -0.6. By rationally assigning the focal length of the sixth lens element L6 to have negative power in the doublet lens, this, when combined with the positive power of the fifth lens element L5, facilitates apochromatism and achieves high image quality.

[0124] In some embodiments of the present invention, the effective focal length F7 of seventh lens element L7 satisfies the following relationship with the effective focal length F of the optical lens: 0.85 ≤ F7 / F ≤ 1.00. By rationally assigning the focal length of seventh lens element L7 to achieve positive power in a doublet lens, and selecting a material with high anomalous dispersion, combined with the negative power of eighth lens element L8 to achieve apochromatism, high image quality is achieved.

[0125] In some embodiments of the present invention, the effective focal length F8 of the eighth lens element L8 satisfies the following relationship with the effective focal length F of the optical lens: -2.6 ≤ F8 / F ≤ -1.7, preferably, -2.3 ≤ F8 / F ≤ -1.85. By rationally assigning the focal length of the eighth lens element L8 to have a negative focal power in the doublet lens, it can be combined with the seventh lens element L7, which has a positive focal power, to achieve apochromatism, thereby facilitating high image quality.

[0126] In some embodiments of the present invention, the effective focal length F9 of the ninth lens element L9 satisfies the following relationship with the effective focal length F of the optical lens: -3.0 ≤ F9 / F ≤ -1.6, preferably, -2.85 ≤ F9 / F ≤ -1.8. By rationally assigning the focal length of the ninth lens element L9 to a negative focal power within the doublet lens, it is combined with the tenth lens element L10, which has a positive focal power, to achieve apochromatism, thereby facilitating high image quality.

[0127] In some embodiments of the present invention, the effective focal length F10 of the tenth lens element L10 satisfies the following relationship with the effective focal length F of the optical lens: 1.0 ≤ F10 / F ≤ 2.0, preferably, 1.2 ≤ F10 / F ≤ 1.8. By rationally assigning the focal length of the tenth lens element L10 to achieve positive power in a doublet lens, and selecting a material with high anomalous dispersion, combined with the negative power of the ninth lens element L9 to achieve apochromatism, high image quality is achieved.

[0128] In some embodiments of the present invention, the effective focal length F11 of the eleventh lens element L11 satisfies the following relationship with the effective focal length F of the optical lens: 1.6 ≤ F11 / F ≤ 3.2, preferably, 1.8 ≤ F11 / F ≤ 3. By rationally assigning the focal length of the eleventh lens element L11 to possess positive power, negative spherical aberration is generated, facilitating correction of residual spherical aberration in the system and achieving high image quality.

[0129] In some embodiments of the present invention, the combined focal length Fa of the fifth lens element L5 and the sixth lens element L6 satisfies the following relationship with the effective focal length F of the optical lens: -4.2 ≤ Fa / F ≤ -1.3, preferably, -4 ≤ Fa / F ≤ -1.48. By rationally assigning the focal lengths of the cemented fifth lens element L5 and the sixth lens element L6, combined with a larger clear aperture, it is advantageous to correct axial chromatic aberration at large apertures, improve lens quality, and facilitate the realization of large apertures.

[0130] In some embodiments of the present invention, the combined focal length Fb of seventh lens element L7 and eighth lens element L8 satisfies the following relationship with the effective focal length F of the optical lens: 1.3 ≤ Fb / F ≤ 1.8, preferably, 1.4 ≤ Fb / F ≤ 1.7. By rationally allocating the focal lengths of the cemented seventh lens element L7 and eighth lens element L8, combined with a larger clear aperture, it is advantageous to correct axial chromatic aberration at large apertures, improve lens quality, and facilitate the realization of large apertures.

[0131] In some embodiments of the present invention, the combined focal length Fc of the ninth lens element L9 and the tenth lens element L10 satisfies the following relationship with the effective focal length F of the optical lens: 1.6 ≤ Fc / F ≤ 6.0, preferably, 2 ≤ Fc / F ≤ 5.68. By rationally allocating the focal lengths of the cemented ninth lens element L9 and the tenth lens element L10, combined with a larger clear aperture, it is advantageous to correct axial chromatic aberration at large apertures, improve lens quality, and facilitate the realization of large apertures.

[0132] 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;

[0133] 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;

[0134] 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.

[0135] In some embodiments of the present invention, any lens of the optical lens system of the present application may be a spherical lens or an aspherical lens. As needed, the present application does not specifically limit the number of spherical and aspherical lenses. When focusing on image quality, the number of aspherical lenses can be increased, or even all lenses can be aspherical. For example, in the present application, lenses 1 through 11 are all spherical lenses.

[0136] In some embodiments of the present invention, the optical lens of the present application may be made of a glass-plastic hybrid material, or may be made of an all-glass material. An optical lens made of glass can suppress the offset 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. The optical lens with an all-glass design has a wider temperature range and can maintain stable optical performance in the range of -40°C to 85°C.

[0137] By rationally allocating the combined focal lengths of the first lens L1 to the sixth lens L6 and the seventh lens L7 to the eleventh lens L11, a reverse telephoto architecture is formed, which is beneficial for increasing the back focus and providing structural space for spectroscopic ranging.

[0138] Furthermore, an inclined flat plate is provided behind the eleventh lens (on the image side), which can be a beam splitter. Protective glass and a ranging detector are provided behind the beam splitter, and another protective glass and an image plane are provided above or below the beam splitter to achieve synchronous imaging and ranging.

[0139] Based on the above-described configuration of the present invention, four sets of specific embodiments are provided below to illustrate the optical lens according to the present invention. The optical lens according to the present invention comprises eleven lenses, with each cemented surface of the cemented lens being counted as a surface. Together with the aperture stop STO, the protective glass CG, and the image plane IMA / rangefinder, the total number of surfaces is 23. The aperture stop STO is positioned between the eighth lens element L8 and the ninth lens element L9.

[0140] The data of the four examples are shown in Table 1 below:

[0141]

[0142]

[0143] Table 1

[0144] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not limited to the following embodiments.

[0145] Example 1

[0146] Figure 1 This is a schematic structural diagram of the optical lens of Example 1 of the present utility model;

[0147] Figure 2 This is a relative illumination diagram of the optical lens of Example 1 of the present utility model;

[0148] Figure 3 This is a transverse light fan diagram of the optical lens of Example 1 of the present invention.

[0149] In Example 1, the first lens L1 is a convexo-convex lens with negative optical power, the second lens L2 is a convexo-convex lens with negative optical power, the third lens L3 is a convexo-convex lens with positive optical power, the fourth lens L4 is a convexo-convex lens with negative optical power, the fifth lens L5 is a convexo-convex lens with positive optical power, the sixth lens L6 is a convexo-convex lens with negative optical power, the seventh lens L7 is a convexo-convex lens with positive optical power, the eighth lens L8 is a convexo-convex lens with negative optical power, the ninth lens L9 is a convexo-convex lens with negative optical power, the tenth lens L10 is a convexo-convexo-planar lens with positive optical power, and the eleventh lens L11 is a convexo-convex lens with positive optical power.

[0150] 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.

[0151] 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.

[0152]

[0153]

[0154] Table 2

[0155] Combine 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.

[0156] The first embodiment of the present invention is an optical lens having at least one of the following characteristics: a large aperture (F1.2), infrared confocality, 2K high image quality, and support for dual-light-path imaging and ranging.

[0157] Example 2

[0158] Figure 4 This is a schematic structural diagram of an optical lens according to a second embodiment of the present invention;

[0159] Figure 5 This is a relative illumination diagram of the optical lens of Example 2 of the present utility model;

[0160] Figure 6 This is a transverse light fan diagram of the optical lens of Example 2 of the present utility model.

[0161] In Example 2, the first lens L1 is a convex-convex lens with negative optical power, the second lens L2 is a meniscus lens with negative optical power, the third lens L3 is a convex-convex lens with positive optical power, the fourth lens L4 is a meniscus lens with negative optical power, the fifth lens L5 is a convex-convex lens with positive optical power, the sixth lens L6 is a meniscus lens with negative optical power, the seventh lens L7 is a convex-convex lens with positive optical power, the eighth lens L8 is a meniscus lens with negative optical power, the ninth lens L9 is a convex-convex lens with negative optical power, the tenth lens L10 is a convex-convex-plano lens with positive optical power, and the eleventh lens L11 is a convex-convex lens with positive optical power.

[0162] 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.

[0163] 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.

[0164] Surface serial number Surface type Curvature radius R Thickness d Refractive index Nd Abbe number Vd S1 spherical surface 51.022 0.80 1.52 54.8 S2 spherical surface 26.882 7.06 S3 spherical surface -24.335 5.75 1.49 70.4 S4 spherical surface -45.142 0.30 S5 spherical surface 29.802 5.03 1.85 23.8 S6 spherical surface 112.404 5.99 S7 spherical surface -163.358 0.80 1.61 44.1 S8 spherical surface 27.598 4.45 S9 spherical surface 305.924 8.45 1.44 95.1 S10 spherical surface -20.890 0.80 1.62 36.8 S11 spherical surface 83.842 0.30 S12 spherical surface 78.575 15.40 1.59 68.3 S13 spherical surface -20.864 0.80 1.61 44.1 S14 spherical surface -43.012 0.30 STO spherical surface Infinity 0.30 S16 spherical surface 137.988 0.80 1.61 37.6 S17 spherical surface 29.972 14.17 1.59 68.3 S18 spherical surface -80.434 0.30 S19 spherical surface 42.763 5.61 1.74 44.9 S20 spherical surface 170.590 45.90 S21 spherical surface Infinity 0.70 1.52 64.2 S22 spherical surface Infinity 1.00 IMA spherical surface Infinity

[0165] Table 3

[0166] Combine 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.

[0167] The second embodiment of the present invention is an optical lens having at least one of the following characteristics: a large aperture (F1.2), infrared confocality, 2K high image quality, and support for dual-optical path imaging and ranging.

[0168] Example 3

[0169] Figure 7 This is a schematic structural diagram of an optical lens according to a third embodiment of the present invention;

[0170] Figure 8 This is a relative illumination diagram of the optical lens of Example 3 of the present utility model;

[0171] Figure 9 This is a transverse light fan diagram of the optical lens of Example 3 of the present utility model.

[0172] In Example 3, the first lens L1 is a convex-concave lens with negative optical power, the second lens L2 is a convex-concave lens with negative optical power, the third lens L3 is a convex-concave lens with positive optical power, the fourth lens L4 is a convex-concave lens with negative optical power, the fifth lens L5 is a convex-convex lens with positive optical power, the sixth lens L6 is a convex-concave lens with negative optical power, the seventh lens L7 is a convex-convex lens with positive optical power, the eighth lens L8 is a convex-concave lens with negative optical power, the ninth lens L9 is a convex-concave lens with negative optical power, the tenth lens L10 is a convex-convex lens with positive optical power, and the eleventh lens L11 is a convex-concave lens with positive optical power.

[0173] 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.

[0174] 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.

[0175]

[0176]

[0177] Table 4

[0178] Combine 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.

[0179] The third embodiment of the present invention is an optical lens having at least one of the following characteristics: a large aperture (F1.2), infrared confocality, 2K high image quality, and support for dual-optical path imaging and ranging.

[0180] Example 4

[0181] Figure 10 Schematic diagram of the structure of the optical lens of Example 4 of the present utility model;

[0182] Figure 11 This is a relative illumination diagram of the optical lens of Example 4 of the present utility model;

[0183] Figure 12 This is a transverse light fan diagram of the optical lens of Example 4 of the present utility model.

[0184] In Example 4, the first lens L1 is a convex-convex lens with negative optical power, the second lens L2 is a meniscus lens with negative optical power, the third lens L3 is a convex-convex lens with positive optical power, the fourth lens L4 is a meniscus lens with negative optical power, the fifth lens L5 is a convex-convex lens with positive optical power, the sixth lens L6 is a meniscus lens with negative optical power, the seventh lens L7 is a convex-convex lens with positive optical power, the eighth lens L8 is a meniscus lens with negative optical power, the ninth lens L9 is a convex-convex lens with negative optical power, the tenth lens L10 is a convex-convex-plano lens with positive optical power, and the eleventh lens L11 is a convex-convex lens with positive optical power.

[0185] 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.

[0186] 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.

[0187]

[0188]

[0189] Table 5

[0190] Combine 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.

[0191] The fourth embodiment of the present invention is an optical lens having at least one of the following characteristics: a large aperture (F1.2), the ability to achieve infrared confocality, 2K high image quality, and support for dual-light path imaging and ranging.

[0192] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the utility model disclosed herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the concept of the utility model. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical lens, characterized in that: Along the optical axis from the object side to the image side, 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; The first lens (L1) is a convex-concave lens, and the object-side surface of the eleventh lens (L11) is a convex surface.

2. The optical lens according to claim 1, wherein: The second lens (L2) is a meniscus 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 meniscus lens, the seventh lens (L7) is a convex-convex lens, and the eighth lens (L8) is a meniscus lens.

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

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

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

6. The optical lens according to claim 1, wherein: 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, wherein: 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.

11. The optical lens according to any one of claims 1 to 6, characterized in that: 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.

12. The optical lens according to any one of claims 1 to 6, wherein: 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.

13. The optical lens according to any one of claims 1 to 6, wherein: 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.

14. The optical lens according to any one of claims 1 to 6, characterized in that: 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.

15. The optical lens according to any one of claims 1 to 6, characterized in that: 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.

16. The optical lens according to any one of claims 1 to 6, characterized in that: 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.

17. The optical lens according to any one of claims 1 to 6, characterized in that: 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.

18. The optical lens according to any one of claims 1 to 6, characterized in that: 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.

19. The optical lens according to any one of claims 1 to 6, wherein: 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.

20. The optical lens according to any one of claims 1 to 6, characterized in that: 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.

21. The optical lens according to any one of claims 1 to 6, characterized in that: 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.

22. The optical lens according to any one of claims 1 to 6, wherein: 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.

23. The optical lens according to any one of claims 1 to 6, characterized in that: 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.

24. The optical lens according to any one of claims 1 to 6, characterized in that: 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.

25. The optical lens according to any one of claims 1 to 6, characterized in that: 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.

26. The optical lens according to any one of claims 1 to 6, characterized in that: 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.

27. The optical lens according to claim 1, wherein: The optical lens meets at least one of the following conditions: 0.3≤Dmax / TTL≤0.4, 4.0≤TTL / F≤4.1, 2.55≤TTL / BFL≤2.75, -4.55≤F1 / F≤-3.3, -4.15≤F2 / F≤-3.45, 1.4≤F3 / F≤2, -1.5≤F4 / F≤-0.9, 0.9≤F5 / F≤1.3, -0.9≤F6 / F≤-0.6, 0.85≤F7 / F≤1.00, -2.3≤F8 / F≤-1.85, -2.85≤F9 / F≤-1.8, 1.2≤F10 / F≤1.8, 1.8≤F11 / F≤3, -4≤Fa / F≤-1.48, 1.4≤Fb / F≤1.7, 2≤Fc / F≤5.68, -0.85≤FI / F≤-0.65, 0.75≤FII / F≤0.9, -1.05≤FI / FII≤-0.8, 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 (L1), F2 is the effective focal length of the second lens (L2), F3 is the effective focal length of the third lens (L3), F4 is the effective focal length of the fourth lens (L4), F5 is the effective focal length of the fifth lens (L5), F6 is the effective focal length of the sixth lens (L6), F7 is the effective focal length of the seventh lens (L7), and F8 is the effective focal length of the eighth lens (L8). focal length, F9 is the effective focal length of the ninth lens (L9), F10 is the effective focal length of the tenth lens (L10), F11 is the effective focal length of the eleventh lens (L11), Fa is the combined focal length of the fifth lens (L5) and the sixth lens (L6), Fb is the combined focal length of the seventh lens (L7) and the eighth lens (L8), Fc is the combined focal length of the ninth lens (L9) and the tenth lens (L10), FI is the combined focal length of the first lens (L1) to the sixth lens (L6), and FII is the combined focal length of the seventh lens (L7) to the eleventh lens (L11).

Images