Optical imaging lens group and optical lens

Abstract

The utility model belongs to the technical field of optical imaging, and particularly relates to an optical imaging lens group and an optical lens, and the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially and coaxially arranged along the light incidence direction, the second lens is a meniscus negative lens of which the concave surface faces the object side; the third lens is a biconcave negative lens; the fourth lens is a meniscus positive lens of which the convex surface faces the image side; the fifth lens is a meniscus positive lens of which the convex surface faces the object side; a diaphragm; the sixth lens is a biconcave negative lens; the seventh lens is a biconvex positive lens; the eighth lens is a biconvex positive lens; the ninth lens is a biconvex positive lens; the tenth lens is a biconvex positive lens; an eleventh lens which is a negative meniscus lens with a concave surface facing the image side; the lens adopts the optical imaging lens group. According to the utility model, clear imaging can be realized, and the advantages of excellent image quality, high imaging resolution, large F number and the like are realized; the method can be adapted to a large-target-surface sensor, and supports long-distance (10m) clear imaging.

Description

Technical Field

[0001] This utility model belongs to the field of optical imaging technology, and in particular relates to an optical imaging lens assembly and an optical lens. Background Technology

[0002] As a core component of optical imaging, the optical lens focuses light to enable the imaging unit to obtain a clear image. Its performance directly determines the image quality and the final usability of the equipment. Among these components, the optical imaging lens assembly, composed of lenses, is the main part of the lens. In industrial applications, especially in low-light conditions, lenses are required to possess comprehensive characteristics such as wide field of view, high light transmission, large image size, high resolution, and miniaturization. However, current products struggle to meet these demands. Existing optical imaging lens assemblies generally suffer from insufficient light transmission and small image size. Traditional lenses cannot meet the requirements for wide field of view operations in low-light conditions. Furthermore, in low-light conditions, increasing the shooting distance leads to problems such as color distortion and reduced resolution in the acquired image. Therefore, how to obtain a high-resolution, high-contrast, miniaturized, and portable optical imaging lens assembly for low-light environments is a pressing issue that needs to be addressed in this field. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides an optical imaging lens assembly and an optical lens with an optimized design, which has the advantages of excellent image quality, high light transmission, large imaging target area, low distortion, and high imaging resolution. At the same time, it adopts designs such as cemented lenses to minimize chromatic aberration, reduce image color distortion, improve image contrast, and reduce size.

[0004] An optical imaging lens assembly includes: [missing information - likely referring to lenses arranged coaxially along the direction of light incidence]

[0005] The first lens is a meniscus negative lens with its concave surface facing the object side;

[0006] The second lens is a meniscus negative lens with its concave surface facing the object side;

[0007] The third lens is a biconcave negative lens;

[0008] The fourth lens is a meniscus positive lens with its convex surface facing the image side;

[0009] The fifth lens is a meniscus positive lens with its convex surface facing the object side;

[0010] Aperture;

[0011] The sixth lens is a biconcave negative lens;

[0012] The seventh lens is a biconvex positive lens;

[0013] The eighth lens is a biconvex positive lens;

[0014] The ninth lens is a biconvex positive lens;

[0015] The tenth lens is a biconvex positive lens;

[0016] The eleventh lens is a meniscus negative lens with its concave surface facing the image side;

[0017] Among them, the first to fifth lenses constitute the front group of lenses; the sixth to eleventh lenses constitute the rear group of lenses; the sixth lens and the seventh lens are closely connected to form the first cemented group; and the tenth lens and the eleventh lens are closely connected to form the second cemented group.

[0018] Furthermore, the material of the first lens is H-ZLAF68C; the material of the second lens is H-LAF52; the material of the third lens is H-ZF88; the material of the fourth lens is H-ZLAF68C; the material of the fifth lens is H-ZF88; the material of the sixth lens is H-ZLAF75; the material of the seventh lens is H-FK61; the material of the eighth lens is H-ZLAF68C; the material of the ninth lens is H-FK61; the material of the tenth lens is H-FK61; and the material of the eleventh lens is H-ZF52.

[0019] Furthermore, the focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens, tenth lens, and eleventh lens are f1, f2, f3, f4, f5, f6, f7, f8, f9, and f1, respectively. 10 f 11 The focal lengths f1 to f11 of the first to eleventh lenses respectively satisfy the following relationship:

[0020] -143≤f1≤-142, -76≤f2≤75, -36≤f3≤-35, 58≤f4≤59, 93≤f5≤94, -26≤f6≤-25, 46≤f7≤47, 71≤f8≤72, 74≤f9≤75, 47≤f 10 ≤48, -41≤f 11 ≤-40.

[0021] Furthermore, the distances between the lenses on the optical axis satisfy the following relationships: the air gap between the first and second lenses is 12–12.5 mm; the air gap between the second and third lenses is 14.5–15 mm; the air gap between the third and fourth lenses is 16–16.5 mm; the air gap between the fourth and fifth lenses is 13.5–14 mm; the air gap between the fifth lens and the aperture stop is 18–18.5 mm; the air gap between the aperture stop and the sixth lens is 3.5–4 mm; the sixth and seventh lenses are cemented sheets with an air gap of 0 mm; the air gap between the seventh and eighth lenses is 0.1–0.5 mm; the air gap between the eighth and ninth lenses is 0.1–0.5 mm; the air gap between the ninth and tenth lenses is 1–1.5 mm; and the tenth and eleventh lenses are cemented sheets with an air gap of 0 mm.

[0022] Furthermore, the distance from the front element of the first lens to the rear element of the eleventh lens is 202.423 mm; the distance from the rear element of the eleventh lens to the image plane is 14.121 mm.

[0023] Furthermore, the total focal length of the optical imaging lens group is 18.23 mm, and the F number is 1.6.

[0024] Furthermore, the operating wavelength range of the optical imaging lens group is 480nm to 700nm.

[0025] Furthermore, the full field of view of the optical imaging lens group is 76°.

[0026] Furthermore, the diameter of the through hole of the aperture is φ26.4mm.

[0027] An optical lens, wherein any of the above optical imaging lens groups are mounted within the optical lens.

[0028] The beneficial effects of this utility model are:

[0029] This invention relates to an optical imaging lens assembly that boasts high resolution, is adaptable to large-area sensors, and supports clear imaging at long distances (10m). The assembly comprises 11 spherical lenses, and all aberrations have been corrected and balanced during the design process. This optical imaging lens assembly offers advantages such as excellent image quality, low distortion, high imaging resolution, and a large F-number. Cemented lenses can be used to minimize or eliminate chromatic aberration, reducing image color distortion and improving image contrast. Using cemented lenses in optical lenses improves image quality and reduces light energy reflection loss, thereby enhancing the clarity of the image. Attached Figure Description

[0030] Figure 1 This is an optical structure diagram of an optical imaging lens assembly according to the present invention;

[0031] Figure 2 This is the MTF curve diagram for the entire operating band of this utility model;

[0032] Figure 3 This is a time chart showing the full operating bands of this utility model;

[0033] Figure 4 This is a time-field distortion diagram of the entire working band of this utility model;

[0034] Figure 5 This is a relative illumination curve diagram for the entire operating band of this utility model;

[0035] In the diagram: STO - aperture stop; L1 - first lens; L2 - second lens; L3 - third lens; L4 - fourth lens; L5 - fifth lens; L6 - sixth lens; L7 - seventh lens; L8 - eighth lens; L9 - ninth lens; L10 - tenth lens; L11 - eleventh lens; IMA - image plane. Detailed Implementation

[0036] To better explain and facilitate understanding of this utility model, the following description is provided in conjunction with the appendix. Figure 1-5 The technical solution and effects of this utility model are described in detail through specific implementation methods.

[0037] like Figure 1 As shown, the first aspect of this embodiment discloses an optical imaging lens assembly, comprising: arranged coaxially along the light incident direction, wherein:

[0038] The first lens L1 is a meniscus negative lens with its concave surface facing the object side;

[0039] The second lens L2 is a meniscus negative lens with its concave surface facing the object side;

[0040] The third lens, L3, is a biconcave negative lens;

[0041] The fourth lens, L4, is a meniscus positive lens with its convex surface facing the image side;

[0042] The fifth lens, L5, is a meniscus positive lens with its convex surface facing the object side;

[0043] Aperture STO;

[0044] The sixth lens, L6, is a biconcave negative lens;

[0045] The seventh lens, L7, is a biconvex positive lens;

[0046] The eighth lens, L8, is a biconvex positive lens;

[0047] The ninth lens, L9, is a biconvex positive lens;

[0048] The tenth lens, L10, is a biconvex positive lens;

[0049] The eleventh lens, L11, is a meniscus negative lens with its concave surface facing the image side;

[0050] Among them, the first lens L1 to the fifth lens L5 constitute the front group lens; the sixth lens L6 to the eleventh lens L11 constitute the rear group lens; the sixth lens L6 and the seventh lens L7 are closely connected to form the first cemented group; the tenth lens L10 and the eleventh lens L11 are closely connected to form the second cemented group.

[0051] The optical imaging lens assembly disclosed in this embodiment includes 11 spherical lenses arranged sequentially along the incident light direction in a negative-negative-positive-positive-positive-positive-positive-positive-negative pattern. By rationally configuring the curvature, thickness, and material of each lens, high-resolution, high-contrast, and compact portable imaging is achieved. Cemented lenses can be used to minimize or eliminate chromatic aberration, thereby improving image quality and reducing light energy reflection loss in the optical lens, thus enhancing the sharpness of the image. Through the interaction of the 11 lenses, a clear image of the object can be obtained at the image plane IMA.

[0052] Furthermore, the material of the first lens L1 is H-ZLAF68C; the material of the second lens L2 is H-LAF52; the material of the third lens L3 is H-ZF88; the material of the fourth lens L4 is H-ZLAF68C; the material of the fifth lens L5 is H-ZF88; the material of the sixth lens L6 is H-ZLAF75; the material of the seventh lens L7 is H-FK61; the material of the eighth lens L8 is H-ZLAF68C; the material of the ninth lens L9 is H-FK61; the material of the tenth lens L10 is H-FK61; and the material of the eleventh lens L11 is H-ZF52.

[0053] Furthermore, the focal lengths of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10, and the eleventh lens L11 are f1, f2, f3, f4, f5, f6, f7, f8, f9, f1, f10, f11, f11, f12, f23, f14, f15, f16, f17, f18, f19, f10, f11, f11, f12, f1 ... 10 f 11 The focal lengths f1 to f11 of the first lens L1 to the eleventh lens L11 sequentially satisfy the following relationship:

[0054] -143≤f1≤-142, -76≤f2≤75, -36≤f3≤-35, 58≤f4≤59, 93≤f5≤94, -26≤f6≤-25, 46≤f7≤47, 71≤f8≤72, 74≤f9≤75, 47≤f 10 ≤48, -41≤f 11≤-40.

[0055] Furthermore, the distances between the lenses along the optical axis satisfy the following relationships: the air gap between the first lens L1 and the second lens L2 is 12–12.5 mm; the air gap between the second lens L2 and the third lens L3 is 14.5–15 mm; the air gap between the third lens L3 and the fourth lens L4 is 16–16.5 mm; the air gap between the fourth lens L4 and the fifth lens L5 is 13.5–14 mm; and the air gap between the fifth lens L5 and the aperture stop STO is 18–18.5 mm. The air gap between the aperture STO and the sixth lens L6 is 3.5–4 mm; the air gap between the sixth lens L6 and the seventh lens L7 is 0 mm (cemented); the air gap between the seventh lens L7 and the eighth lens L8 is 0.1–0.5 mm; the air gap between the eighth lens L8 and the ninth lens L9 is 0.1–0.5 mm; the air gap between the ninth lens L9 and the tenth lens L10 is 1–1.5 mm; the air gap between the tenth lens L10 and the eleventh lens L11 is 0 mm (cemented).

[0056] Furthermore, the distance from the front element of the first lens (i.e., surface S1) to the rear element of the eleventh lens (i.e., surface S22) is 202.423 mm; the distance from the rear element of the eleventh lens S22 to the image plane IMA is 14.121 mm.

[0057] By compressing the overall length of the lens to 202.423mm and the maximum diameter of the lens to 75mm, this optical imaging lens group can clearly image objects within 10m of the front element of the first lens at the image plane position, making the device using this optical imaging lens group smaller in size while maintaining high-quality imaging.

[0058] Furthermore, the total focal length of the optical imaging lens group is 18.23 mm, and the F number is 1.6.

[0059] Furthermore, the operating wavelength range of the optical imaging lens group is 480nm to 700nm.

[0060] Furthermore, the full field of view of the optical imaging lens group is 76°.

[0061] Furthermore, the through-hole diameter of the aperture STO is φ26.4mm.

[0062] This optical imaging lens assembly has a low F-number, allowing more light to pass through and increasing the amount of light received, thus enabling the resolution of more details and meeting the needs of low-light environments. Furthermore, this optical imaging lens assembly is compatible with large-format sensors. Specifically, the pixel size of a normal camera is approximately 3.5µm. In low-light environments, larger pixels have a stronger light-gathering ability; cameras with 10µm pixels are generally used, resulting in an imaging surface 2-3 times larger than that of a typical camera for low-light conditions. When used with a 10µm pixel camera with a resolution of 2560×1600, this optical imaging lens assembly achieves a full field of view of 76°, meeting the needs of wide-field-of-view operations in low-light environments.

[0063] like Figure 2 The figure shows the modulation transfer function (MTF) curves of the optical imaging lens group of this invention across the entire working band. As can be seen from the figure, within the spatial frequency range of the cutoff frequency of 50 lp / mm, the MTF of each field of view is higher than 0.5 and greater than 0.3, indicating that the optical imaging lens group has good imaging effect and high resolution across the entire field of view.

[0064] like Figure 3 The figure shows a dot plot of the optical imaging lens assembly of this invention across all working wavelengths. It can be seen from the figure that the RMS of the imaging blur spots corresponding to each field of view is less than 9.873 μm, which is less than the camera pixel size of 10 μm, indicating that the optical imaging lens assembly has good imaging quality.

[0065] like Figure 4 The figure shows the field curvature distortion diagram of the optical imaging lens assembly of this utility model across the entire working band. It can be seen from the figure that the distortion of the lens does not exceed 4.83% and is less than 5% at each field of view, indicating that the imaging quality of the optical imaging lens assembly is good.

[0066] like Figure 5 The figure shows the relative illumination curves of the optical imaging lens group of this utility model across the entire working wavelength range. As can be seen from the figure, the relative illumination value of the optical imaging lens group is greater than 97% under the maximum field of view, indicating that the imaging quality of the optical imaging lens group is good.

[0067] Please refer to Table 1 and Figure 1 Table 1 lists the relevant parameters of each lens in this example, including radius of curvature, thickness, refractive index of the material, and Abbe number:

[0068] Table 1

[0069]

[0070] Infinity represents infinity, and STO represents the aperture plane.

[0071] The second aspect of this embodiment discloses an optical lens, in which the aforementioned optical imaging lens assembly is installed. This optical lens can be applied to a camera, with a selectable pixel size of 10µm, a resolution of 2560×1600, and a target surface size of 25.6mm x 16.0mm. Compared with existing optical imaging lens assemblies, this optical imaging lens assembly has excellent imaging performance, meeting the needs of large field-of-view operations in low-light environments. In addition to clearly capturing corresponding scenes on land, the optical lens can also capture underwater scenes from the water surface or sea surface (the lens itself does not need to be submerged), achieving clear imaging results. By rationally configuring the curvature, thickness, and material of each lens, high-resolution, high-contrast, and compact portable imaging is achieved. Cemented lenses can be used to minimize or eliminate chromatic aberration, thereby improving image quality and reducing light energy reflection loss, thus enhancing the clarity of the lens image.

Claims

1. An optical imaging lens assembly, characterized in that: Including those arranged coaxially along the direction of light incidence: The first lens is a meniscus negative lens with its concave surface facing the object side; The second lens is a meniscus negative lens with its concave surface facing the object side; The third lens is a biconcave negative lens; The fourth lens is a meniscus positive lens with its convex surface facing the image side; The fifth lens is a meniscus positive lens with its convex surface facing the object side; Aperture; The sixth lens is a biconcave negative lens; The seventh lens is a biconvex positive lens; The eighth lens is a biconvex positive lens; The ninth lens is a biconvex positive lens; The tenth lens is a biconvex positive lens; The eleventh lens is a meniscus negative lens with its concave surface facing the image side; Among them, the first to fifth lenses constitute the front group of lenses; the sixth to eleventh lenses constitute the rear group of lenses; the sixth lens and the seventh lens are closely connected to form the first cemented group; and the tenth lens and the eleventh lens are closely connected to form the second cemented group.

2. The optical imaging lens assembly according to claim 1, characterized in that: The material of the first lens is H-ZLAF68C; the material of the second lens is H-LAF52; the material of the third lens is H-ZF88; the material of the fourth lens is H-ZLAF68C; the material of the fifth lens is H-ZF88; the material of the sixth lens is H-ZLAF75; the material of the seventh lens is H-FK61; the material of the eighth lens is H-ZLAF68C; the material of the ninth lens is H-FK61; the material of the tenth lens is H-FK61; and the material of the eleventh lens is H-ZF52.

3. The optical imaging lens assembly according to claim 1, characterized in that: The focal lengths of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, and eleventh lenses are f1, f2, f3, f4, f5, f6, f7, f8, f9, and f1, respectively. 10 f 11 The focal lengths f1 to f11 of the first to eleventh lenses respectively satisfy the following relationship: -143≤f1≤-142,-76≤f2≤75,-36≤f3≤-35,58≤f4≤59,93≤f5≤94,-26≤f6≤-25,46≤f7≤47,71≤f8≤72,74≤f9≤75,47≤f 10 ≤48,-41≤f 11 ≤-40。 4. The optical imaging lens assembly according to claim 1, characterized in that: The distances between the lenses on the optical axis satisfy the following relationships: the air gap between the first and second lenses is 12–12.5 mm; the air gap between the second and third lenses is 14.5–15 mm; the air gap between the third and fourth lenses is 16–16.5 mm; the air gap between the fourth and fifth lenses is 13.5–14 mm; the air gap between the fifth lens and the aperture stop is 18–18.5 mm; the air gap between the aperture stop and the sixth lens is 3.5–4 mm; the sixth and seventh lenses are cemented sheets with an air gap of 0 mm; the air gap between the seventh and eighth lenses is 0.1–0.5 mm; the air gap between the eighth and ninth lenses is 0.1–0.5 mm; the air gap between the ninth and tenth lenses is 1–1.5 mm; the tenth and eleventh lenses are cemented sheets with an air gap of 0 mm.

5. An optical imaging lens assembly according to claim 1, characterized in that: The distance from the front element of the first lens to the rear element of the eleventh lens is 202.423 mm; the distance from the rear element of the eleventh lens to the image plane is 14.121 mm.

6. An optical imaging lens assembly according to claim 1, characterized in that: The total focal length of the optical imaging lens group is 18.23 mm, and the F number is 1.

6.

7. An optical imaging lens assembly according to claim 1, characterized in that: The optical imaging lens group operates in the wavelength range of 480nm to 700nm.

8. An optical imaging lens assembly according to claim 1, characterized in that: The full field of view of the optical imaging lens group is 76°.

9. An optical imaging lens assembly according to claim 1, characterized in that: The aperture diameter is φ26.4mm.

10. An optical lens, characterized in that: The optical lens is equipped with an optical imaging lens group as described in any one of claims 1-9.

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