Low-distortion horizontal 120-degree lens

Abstract

The utility model belongs to the technical field of optical lenses, and discloses a low-distortion horizontal 120-degree lens, which comprises a first glass lens, a second plastic lens, a third plastic lens, a fourth glass lens, a fifth plastic lens and a sixth plastic lens which are sequentially arranged from an object plane to an image plane along an optical axis, the third plastic lens, the fourth glass lens and the fifth plastic lens have positive focal lengths, and the first glass lens, the second plastic lens and the sixth plastic lens have negative focal lengths. According to the utility model, through the cooperation of the curvature system of each lens and the plurality of plastic sheets, the distortion can be within 10%, and meanwhile, the difference balance infrared defocusing amount (850 nm) can be 12-14 [mu] m, i.e., the low distortion function (850 nm infrared defocusing amount) can be realized.

Description

Technical Field

[0001] This utility model belongs to the field of optical lens technology, specifically relating to a lens with a low distortion level of 120 degrees. Background Technology

[0002] With the development of technology, there are more and more shooting devices on the market, and some new demands have emerged in some smart fields. For example, the smart screen field has new requirements for lenses with each iteration, such as miniaturization and high pixels, while also requiring a large aperture. However, most products on the market at present cannot meet such market demands. Utility Model Content

[0003] The purpose of this invention is to provide a low-distortion 120-degree horizontal lens to solve the aforementioned problems in the prior art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A low-distortion 120-degree horizontal lens includes a first glass lens, a second plastic lens, a third plastic lens, a fourth glass lens, a fifth plastic lens, and a sixth plastic lens arranged sequentially along the optical axis from the object plane to the image plane. The third plastic lens, the fourth glass lens, and the fifth plastic lens have positive focal lengths, while the first glass lens, the second plastic lens, and the sixth plastic lens have negative focal lengths.

[0006] As a preferred technical solution of this utility model, an aperture stop is provided between the third plastic lens and the fourth glass lens.

[0007] In a preferred embodiment of this invention, the first glass lens, the second plastic lens, the third plastic lens, the fourth glass lens, the fifth plastic lens, and the sixth plastic lens are, in sequence, surface one, surface two, surface three, surface four, surface five, surface six, surface seven, surface eight, surface nine, surface ten, surface eleven, and surface twelve along the optical axis from the object plane to the image plane. The radius of curvature of surface one is 22.83–24.53 mm, the radius of curvature of surface two is 4.05–4.21 mm, the radius of curvature of surface three is 3.92–4.05 mm, and the radius of curvature of surface four is… The radius of curvature of facet 5 is 1.45–1.59 mm, that of facet 6 is 4.22–4.37 mm, that of facet 7 is 4.38–4.52 mm, that of facet 8 is 9.65–9.80 mm, that of facet 9 is -2.49–-2.36 mm, that of facet 10 is -1.64–-1.51 mm, that of facet 11 is -1.19–-1.07 mm, and that of facet 12 is -1.89–-1.75 mm.

[0008] As a preferred technical solution of this utility model, both sides of the second, third, fifth and sixth plastic lenses are even-order aspherical surfaces.

[0009] As a preferred technical solution of this utility model, the dispersion coefficient of surface one is 63.946~66.996ps / (nm·km), the dispersion coefficient of surface three is 52.246~55.996ps / (nm·km), the dispersion coefficient of surface five is 20.3513~20.57ps / (nm·km), the dispersion coefficient of surface seven is 55.946~55.996ps / (nm·km), the dispersion coefficient of surface nine is 52.246~55.996ps / (nm·km), and the dispersion coefficient of surface eleven is 20.3513~20.57ps / (nm·km).

[0010] As a preferred technical solution of this utility model, the first glass lens, the second plastic lens, the third plastic lens, the fourth glass lens, the fifth plastic lens, and the sixth plastic lens are all made of different materials.

[0011] As a preferred technical solution of this utility model, the total length of the low-distortion small CRA high-pixel miniaturized lens is 14-16cm.

[0012] Beneficial effects: This utility model provides a low-distortion 120-degree horizontal lens, including a first glass lens, a second plastic lens, a third plastic lens, a fourth glass lens, a fifth plastic lens, and a sixth plastic lens arranged sequentially along the optical axis from the object plane to the image plane. The third plastic lens, the fourth glass lens, and the fifth plastic lens have positive focal lengths, while the first glass lens, the second plastic lens, and the sixth plastic lens have negative focal lengths. The fifth plastic lens plays a role in correcting distortion. Through the curvature system of each lens and the cooperation of multiple plastic sheets, the distortion can be reduced to within 10%. At the same time, the phase difference balance infrared defocus (850nm) can be achieved to 12um~14um, thus realizing the low-distortion function: 850nm infrared defocus. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the lens with a low distortion level of 120 degrees according to this utility model;

[0014] Figure 2 The MTF curve of the low-distortion 120-degree lens of this utility model in the working band of 400nm to 1100nm.

[0015] Figure 3 This is a focus curve diagram according to one embodiment of the present invention;

[0016] Figure 4This is a dot diagram of the low-distortion 120-degree lens of this utility model;

[0017] Figure 5 This is a relative illumination diagram of the low-distortion 120-degree lens of this utility model.

[0018] In the diagram: 1-First glass lens; 2-Second plastic lens; 3-Third plastic lens; 4-Fourth glass lens; 5-Fifth plastic lens; 6-Sixth plastic lens; S1-Surface 1; S2-Surface 2; S3-Surface 3; S4-Surface 4; S5-Surface 5; S6-Surface 6; S7-Surface 7; S8-Surface 8; S9-Surface 9; S10-Surface 10; S11-Surface 11; S12-Surface 12. Detailed Implementation

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is used to help understand this utility model, but does not constitute a limitation on this utility model.

[0020] Example:

[0021] like Figure 1 As shown, this embodiment provides a lens with a low distortion level of 120 degrees, including a first glass lens 1, a second plastic lens 2, a third plastic lens 3, a fourth glass lens 4, a fifth plastic lens 5, and a sixth plastic lens 6 arranged sequentially along the optical axis from the object plane to the image plane. An aperture stop is provided between the third plastic lens 3 and the fourth glass lens 4. The third plastic lens 3, the fourth glass lens 4, and the fifth plastic lens 5 have positive focal lengths, while the first glass lens 1, the second plastic lens 2, and the sixth plastic lens 6 have negative focal lengths. The fifth plastic lens 5 serves to correct distortion. The side surfaces of the first glass lens 1, the second plastic lens 2, the third plastic lens 3, the fourth glass lens 4, the fifth plastic lens 5, and the sixth plastic lens 6 along the optical axis from the object plane to the image plane are, in sequence, surface S1, surface S2, surface S3, surface S4, surface S5, surface S6, surface S7, surface S8, surface S9, surface S10, surface S11, and surface S12.

[0022] As one embodiment of the technical solution, it should be further explained that the radius of curvature of surface S1 is 22.83–24.53 mm, the radius of curvature of surface S2 is 4.05–4.21 mm, the radius of curvature of surface S3 is 3.92–4.05 mm, the radius of curvature of surface S4 is 1.45–1.59 mm, the radius of curvature of surface S5 is 4.22–4.37 mm, the radius of curvature of surface S6 is 4.38–4.52 mm, the radius of curvature of surface S7 is 9.65–9.80 mm, the radius of curvature of surface S8 is -2.49–-2.36 mm, and the radius of curvature of surface S9 is 9 mm. The curvature radius of surface S10 is -1.64 to -1.51 mm, that of surface S11 is -1.19 to -1.07 mm, and that of surface S12 is -1.89 to -1.75 mm. Through the curvature system of the first glass lens 1, the second plastic lens 2, the third plastic lens 3, the fourth glass lens 4, the fifth plastic lens 5, and the sixth plastic lens 6, as well as the cooperation of multiple plastic sheets, the distortion can be kept within 10%. At the same time, with the addition of the phase difference balance infrared defocus (850nm), it can be kept within 12um to 14um, that is, the low distortion function is achieved: 850nm infrared defocus.

[0023] As one implementation of the technical solution in this embodiment, it should be further explained that both surfaces of the second plastic lens 2, the third plastic lens 3, the fifth plastic lens 5, and the sixth plastic lens 6 are even-order aspherical surfaces. By combining multiple lenses with even-order aspherical surfaces, aberrations such as spherical aberration, coma, astigmatism, and field curvature can be effectively corrected, thereby improving the resolving quality of the lens. Furthermore, since the first glass lens 1, the second plastic lens 2, the third plastic lens 3, the fourth glass lens 4, the fifth plastic lens 5, and the sixth plastic lens 6 are made of different materials, aberrations can be reduced through the matching of dispersion coefficients. Simultaneously, the high-precision plastic lens barrel further improves image quality, thereby achieving ideal resolving power. For example, to achieve a resolution of 8 million or more, preferably, the dispersion coefficient of surface S1 is 63.946 to 66.996 ps / (nm·km), the dispersion coefficient of surface S3 is 52.246 to 55.996 ps / (nm·km), the dispersion coefficient of surface S5 is 20.3513 to 20.57 ps / (nm·km), the dispersion coefficient of surface S7 is 55.946 to 55.996 ps / (nm·km), the dispersion coefficient of surface S9 is 52.246 to 55.996 ps / (nm·km), and the dispersion coefficient of surface S11 is 20.3513 to 20.57 ps / (nm·km).

[0024] When this utility model needs to achieve cost reduction in practical applications, such as when the low-distortion 120-degree lens of this utility model is applied to the lens of lawnmowers, new energy vehicles or law enforcement recorders, and at the same time it is in the 400-1100nm band, the design can mainly consider moving towards low distortion, miniaturization, high pixel, and low cost. At the same time, the image plane is reserved to meet the chip size of 1 / 2.7. Structurally, the focusing method should be extremely simple, namely screw focusing. The coating adopts the 400-1100nm band. The lens is considered in the stray light evaluation stage, and no ink is applied in the later stage to remove the light.

[0025] As a preferred embodiment, the low-distortion 120-degree horizontal lens of this invention is applied to an optical fixed-focus lens with a focal length between 1.7 and 2.5, an aperture between 1.8 and 2.5, and a total length between 14 and 16, while maintaining high resolution. It employs a temperature compensation design, operating without defocusing in environments ranging from -40℃ to +80℃. The mutual compensation of optical power between positive and negative lenses not only ensures the performance of the optical system but also reduces component processing costs, simplifies the structure, reduces weight, and facilitates mass production, meeting market demands. Furthermore, the use of low-dispersion materials improves image quality. Specifically, the relevant parameters of each lens in the low-distortion 120-degree horizontal lens of this invention are shown in Tables 1 and 2 below:

[0026] Table 1: Relevant parameters of each lens

[0027]

[0028]

[0029] Table 2: Quadratic coefficient values ​​for corresponding lenses

[0030]

[0031] Please refer to Figure 2 and Figure 3 As shown, Figure 2 and Figure 3 The MTF curve and focus curve of one embodiment of the lens of this utility model are shown respectively in the working wavelength range of 400nm to 1100nm. From Figure 2 and Figure 3 As can be seen from the above, the low-distortion, small-CRA, high-pixel miniaturized lens of this invention has good focusing effect, can guarantee high resolution, and has good image quality.

[0032] Please refer to Figure 4 and Figure 5 , Figure 5 A relative illumination diagram of an embodiment of the lens of this utility model is shown, wherein the horizontal axis represents the field of view and the vertical axis represents the relative illumination. From Figure 4 As can be seen from the data, the relative illumination of this embodiment reaches more than 80%, which is good relative illumination.

[0033] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A low-distortion horizontal 120-degree lens, characterized in that, The lens includes a first glass lens (1), a second plastic lens (2), a third plastic lens (3), a fourth glass lens (4), a fifth plastic lens (5), and a sixth plastic lens (6) arranged sequentially from the object plane to the image plane along the optical axis. The third plastic lens (3), the fourth glass lens (4), and the fifth plastic lens (5) have positive focal lengths, while the first glass lens (1), the second plastic lens (2), and the sixth plastic lens (6) have negative focal lengths.

2. The low-distortion 120-degree horizontal lens according to claim 1, characterized in that, An aperture is provided between the third plastic lens (3) and the fourth glass lens (4).

3. The low-distortion 120-degree horizontal lens according to claim 1, characterized in that, The first glass lens (1), the second plastic lens (2), the third plastic lens (3), the fourth glass lens (4), the fifth plastic lens (5), and the sixth plastic lens (6) are arranged along the optical axis from the object plane to the image plane as surface one (S1), surface two (S2), surface three (S3), surface four (S4), surface five (S5), surface six (S6), surface seven (S7), surface eight (S8), surface nine (S9), surface ten (S10), surface eleven (S11), and surface twelve (S12). The radius of curvature of surface one (S1) is 22.83-24.53 mm, the radius of curvature of surface two (S2) is 4.05-4.21 mm, and the radius of curvature of surface three (S3) is 3.92-4. The radius of curvature of face 4 (S4) is 1.45–1.59 mm, that of face 5 (S5) is 4.22–4.37 mm, that of face 6 (S6) is 4.38–4.52 mm, that of face 7 (S7) is 9.65–9.80 mm, that of face 8 (S8) is -2.49–-2.36 mm, that of face 9 (S9) is 9.79–9.92 mm, that of face 10 (S10) is -1.64–-1.51 mm, that of face 11 (S11) is -1.19–-1.07 mm, and that of face 12 (S12) is -1.89–-1.75 mm.

4. The low-distortion horizontal 120-degree lens according to claim 1, characterized in that, The second plastic lens (2), the third plastic lens (3), the fifth plastic lens (5) and the sixth plastic lens (6) are both even-order aspherical surfaces.

5. A lens with a low distortion level of 120 degrees according to claim 1 or 4, characterized in that, The dispersion coefficients of surface 1 (S1) are 63.946–66.996 ps / (nm·km), surface 3 (S3) is 52.246–55.996 ps / (nm·km), surface 5 (S5) is 20.3513–20.57 ps / (nm·km), surface 7 (S7) is 55.946–55.996 ps / (nm·km), surface 9 (S9) is 52.246–55.996 ps / (nm·km), and surface 11 (S11) is 20.3513–20.57 ps / (nm·km).

6. The low-distortion horizontal 120-degree lens according to claim 5, characterized in that, The first glass lens (1), the second plastic lens (2), the third plastic lens (3), the fourth glass lens (4), the fifth plastic lens (5), and the sixth plastic lens (6) are made of different materials.

7. The low-distortion 120-degree horizontal lens according to claim 1, characterized in that, The total length of the low-distortion, small-CRA, high-pixel miniaturized lens is 14-16cm.

Images