A type of M12 fisheye high-resolution wide-angle lens

Abstract

This invention belongs to the field of optical lens technology and discloses an M12 fisheye high-pixel wide-angle lens, including a first glass lens, a second glass lens, a third plastic lens, and a fourth plastic lens arranged sequentially along the optical axis from the object plane to the image plane. The first glass lens and the fourth plastic lens have negative focal lengths, while the second glass lens and the third plastic lens have positive focal lengths. In this invention, the second glass lens 2 corrects distortion, and the third plastic lens 3 and the fourth plastic lens 4 correct distortion and CRA to a certain extent. Through the curvature system of each lens and the cooperation of multiple plastic sheets, TV distortion can be reduced to within 20%, thus achieving the low distortion requirement in the M12 fisheye high-pixel wide-angle lens.

Description

Technical Field

[0001] This utility model belongs to the field of optical lens technology, specifically relating to an M12 fisheye high-pixel wide-angle lens. Background Technology

[0002] With the development of technology, there are more and more high-pixel lenses 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 pixel count, 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 an M12 fisheye high-pixel wide-angle lens to solve the aforementioned problems existing in the prior art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An M12 fisheye high-pixel wide-angle lens includes a first glass lens, a second glass lens, a third plastic lens, and a fourth plastic lens arranged sequentially along the optical axis from the object plane to the image plane. The first glass lens and the fourth plastic lens have negative focal lengths, and the second glass lens and the third plastic lens have positive focal lengths.

[0005] As a preferred technical solution of this utility model, an aperture is provided between the first glass lens and the second glass lens.

[0006] As a preferred technical solution of this utility model, the first glass lens, the second glass lens, the third plastic lens and the fourth plastic lens are arranged along the optical axis from the object plane to the image plane as surface one, surface two, surface three, surface four, surface five, surface six, surface seven and surface eight respectively. Surface one, surface two, surface three, surface four and surface five are all calibrating surfaces, and surface six, surface seven and surface eight are all even-order aspherical surfaces.

[0007] As a preferred technical solution of this utility model, the radius of curvature of surface one is 43.87~44.02mm, the radius of curvature of surface two is 2.40~2.55mm, the radius of curvature of surface three is infinite, the radius of curvature of surface four is 7.31~7.46mm, the radius of curvature of surface five is -7.46~-7.31mm, the radius of curvature of surface six is ​​6.15~6.30mm, the radius of curvature of surface seven is -1.40~-1.25mm, and the radius of curvature of surface eight is -11.03~-10.88mm.

[0008] As a preferred technical solution of this utility model, the refractive index of the first glass lens is 1.724-1.793mm, the refractive index of the second glass lens is 1.724-1.803mm, the refractive index of the third plastic lens is 1.4513-1.671mm, and the refractive index of the fourth plastic lens is 1.624-1.683mm.

[0009] As a preferred technical solution of this utility model, the dispersion coefficient of the first glass lens is 48.946~55.996ps / nm.km, the dispersion coefficient of the second glass lens is 44.246~44.696ps / nm.km, the dispersion coefficient of the third plastic lens is 54.312~56.392ps / nm.km, and the dispersion coefficient of the fourth plastic lens is 23.946~24.596ps / nm.km.

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

[0011] As a preferred technical solution of this utility model, the total length of the M12 fisheye high-pixel wide-angle lens is 17.3-18.0cm.

[0012] Beneficial Effects: This utility model provides an M12 fisheye high-pixel wide-angle lens, including a first glass lens, a second glass lens, a third plastic lens, and a fourth plastic lens arranged sequentially along the optical axis from the object plane to the image plane. The first glass lens and the fourth plastic lens have negative focal lengths, while the second glass lens and the third plastic lens have positive focal lengths. The second glass lens 2 plays a role in correcting distortion, and the third plastic lens 3 and the fourth plastic lens 4 play a role in correcting distortion and CRA to a certain extent. Through the curvature system of each lens and the cooperation of multiple plastic sheets, TV distortion can be reduced to within 20%, thereby achieving the requirement of low distortion in the M12 fisheye high-pixel wide-angle lens. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the M12 fisheye high-pixel wide-angle lens of this utility model; Figure 2 The MTF curve of the M12 fisheye high-pixel wide-angle lens of this utility model in the working wavelength band of 400nm to 700nm; Figure 3 This is a focus curve diagram according to one embodiment of the present invention; Figure 4 This is a dot diagram of the M12 fisheye high-pixel wide-angle lens of this utility model; Figure 5This is a relative illumination diagram of the M12 fisheye high-pixel wide-angle lens of this utility model.

[0014] In the diagram: 1-First glass lens; 2-Second glass lens; 3-Third plastic lens; 4-Fourth 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. Detailed Implementation

[0015] 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.

[0016] Example: like Figure 1 As shown, this embodiment provides an M12 fisheye high-pixel wide-angle lens, including a first glass lens 1, a second glass lens 2, a third plastic lens 3, and a fourth plastic lens 4 arranged sequentially along the optical axis from the object plane to the image plane. An aperture stop is provided between the first glass lens 1 and the second glass lens 2. The first glass lens 1 and the fourth plastic lens 4 have negative focal lengths, and the second glass lens 2 and the third plastic lens 3 have positive focal lengths. The second glass lens 2 plays a role in correcting distortion, and the third plastic lens 3 and the fourth plastic lens 4 play a role in correcting distortion and CRA to a certain extent. For ease of technical understanding, the two sides of each lens are defined as follows: the first glass lens 1, the second glass lens 2, the third plastic lens 3, and the fourth plastic lens 4, along the optical axis from the object plane to the image plane, are successively named surface S1, surface S2, surface S3, surface S4, surface S5, surface S6, surface S7, and surface S8. Specifically, the side of the first glass lens 1 closest to the object plane is surface S1, and the other side is surface S2; the side of the second glass lens 2 closest to the object plane is surface S3, and the other side is surface S4; the side of the third plastic lens 3 closest to the object plane is surface S5, and the other side is surface S6; and the side of the fourth plastic lens 4 closest to the object plane is surface S7, and the other side is surface S8. Figure 1 As shown.

[0017] This invention provides an M12 fisheye high-pixel wide-angle lens, comprising a first glass lens, a second glass lens, a third plastic lens, and a fourth plastic lens arranged sequentially along the optical axis from the object plane to the image plane. The first glass lens and the fourth plastic lens have negative focal lengths, while the second glass lens and the third plastic lens have positive focal lengths. The second glass lens 2 corrects distortion, and the third plastic lens 3 and the fourth plastic lens 4 correct distortion and CRA to a certain extent. Through the curvature system of each lens and the cooperation of multiple plastic sheets, TV distortion can be reduced to within 20%, thus achieving the requirement of low distortion in the M12 fisheye high-pixel wide-angle lens.

[0018] As a preferred embodiment of this work, it should be further noted that surfaces S1, S2, S3, S4, and S5 are all calibration surfaces, and surfaces S6, S7, and S8 are all 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 lens's resolving quality. Furthermore, the materials of the first glass lens 1, the second glass lens 2, the third plastic lens 3, and the fourth plastic lens 4 are different, which can be addressed by matching their dispersion coefficients. By reducing aberrations and further improving image quality through a high-precision plastic lens barrel, ideal resolving power can be achieved, reaching a resolution of over 5 million. For example, the dispersion coefficient of surface S1 is 48.946–55.996 ps / nm·km, the dispersion coefficient of surface S4 is 44.246–44.696 ps / nm·km, the dispersion coefficient of surface S6 is 54.312–56.392 ps / nm·km, and the dispersion coefficient of surface S8 is 23.946–24.596 ps / nm·km.

[0019] As a preferred embodiment of this example, it should be further explained that the radius of curvature of surface S1 is 43.87-44.02 mm, the radius of curvature of surface S2 is 2.40-2.55 mm, the radius of curvature of surface S3 is infinite, the radius of curvature of surface S4 is 7.31-7.46 mm, the radius of curvature of surface S5 is -7.46--7.31 mm, the radius of curvature of surface S6 is 6.15-6.30 mm, the radius of curvature of surface S7 is -1.40--1.25 mm, and the radius of curvature of surface S8 is -11.03--10.88 mm. Through the curvature system of the first glass lens 1, the second glass lens 2, the third plastic lens 3, and the fourth plastic lens 4, as well as the cooperation of multiple plastic sheets, TV distortion can be reduced to within 20%, achieving a low distortion function.

[0020] When this utility model needs to achieve cost reduction in practical applications, such as when the M12 fisheye high-pixel wide-angle lens is used in the smart screen field of smart door locks, and the wavelength is 400-700nm, the design can mainly consider moving towards low and large angle, miniaturization, high pixel, and low cost. At the same time, the image plane should reserve a chip that meets the 1 / 2.9 standard. The structure should consider a very simple way to focus, namely screw focusing, and the coating should use the 400-700nm wavelength.

[0021] As a preferred embodiment, this M12 fisheye high-pixel wide-angle lens is applied to a fixed-focus lens with a focal length between 2.515 and 2.885, an aperture between 2.0 and 2.4, and a total length between 17.3 and 18.0 cm, while maintaining high resolution. It employs a temperature compensation design, operating without defocusing in environments ranging from -40℃ to +60℃. The mutual compensation of positive and negative lens power 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. Preferably, the refractive index of surface S1 is 1.724–1.793 mm, the refractive index of surface S4 is 1.724–1.803 mm, the refractive index of surface S6 is 1.4513–1.671 mm, and the refractive index of surface S8 is 1.624–1.683 mm. Specifically, the relevant parameters of each lens in the M12 fisheye high-pixel wide-angle lens of this utility model are shown in Table 1 and Table 2 below: Table 1: Relevant parameters of each lens

[0022] Table 2: Quadratic coefficient values ​​for corresponding lenses

[0023] Please refer to Figure 2 and Figure 3 As shown, Figure 2 and Figure 3 The MTF curve and focus curve of an embodiment of the M12 fisheye high-pixel wide-angle lens of this utility model are shown respectively in the working wavelength range of 400nm to 700nm. From Figure 2 and Figure 3 As can be seen, the M12 fisheye high-pixel wide-angle lens of this utility model has good focusing effect, can guarantee high resolution, and has good image quality.

[0024] Please refer to Figure 4 and Figure 5 , Figure 5 This diagram illustrates the relative illumination of an embodiment of the M12 fisheye high-pixel wide-angle lens of this invention, where the horizontal axis represents the field of view and the vertical axis represents the relative illumination. From Figure 4 As can be seen, the relative illumination of this embodiment reaches more than 80%, which is good relative illumination.

[0025] This invention provides a wide-angle fisheye lens. By limiting the parameters and structure, it enables action camera lenses to achieve miniaturization while still allowing for shooting at a smaller focal length, thus enhancing the user experience.

[0026] 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 M12 fisheye high-pixel wide-angle lens, characterized in that, It includes a first glass lens (1), a second glass lens (2), a third plastic lens (3) and a fourth plastic lens (4) arranged sequentially from the object plane to the image plane along the optical axis. The first glass lens (1) and the fourth plastic lens (4) have negative focal lengths, and the second glass lens (2) and the third plastic lens (3) have positive focal lengths.

2. The M12 fisheye high-pixel wide-angle lens according to claim 1, characterized in that, An aperture is provided between the first glass lens (1) and the second glass lens (2).

3. The M12 fisheye high-pixel wide-angle lens according to claim 1, characterized in that, The first glass lens (1), the second glass lens (2), the third plastic lens (3) and the fourth plastic lens (4) 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) and surface eight (S8). Surface one (S1), surface two (S2), surface three (S3), surface four (S4) and surface five (S5) are all standard surfaces, and surface six (S6), surface seven (S7) and surface eight (S8) are all even-order aspherical surfaces.

4. The M12 fisheye high-pixel wide-angle lens according to claim 3, characterized in that, The radius of curvature of surface one (S1) is 43.87–44.02 mm, the radius of curvature of surface two (S2) is 2.40–2.55 mm, the radius of curvature of surface three (S3) is infinite, the radius of curvature of surface four (S4) is 7.31–7.46 mm, the radius of curvature of surface five (S5) is -7.46–-7.31 mm, the radius of curvature of surface six (S6) is 6.15–6.30 mm, the radius of curvature of surface seven (S7) is -1.40–-1.25 mm, and the radius of curvature of surface eight (S8) is -11.03–-10.88 mm.

5. The M12 fisheye high-pixel wide-angle lens according to claim 4, characterized in that, The first glass lens (1) has a refractive index of 1.724 to 1.793 mm, the second glass lens (2) has a refractive index of 1.724 to 1.803 mm, the third plastic lens (3) has a refractive index of 1.4513 to 1.671 mm, and the fourth plastic lens (4) has a refractive index of 1.624 to 1.683 mm.

6. An M12 fisheye high-pixel wide-angle lens according to claim 4 or 5, characterized in that, The dispersion coefficient of the first glass lens (1) is 48.946 to 55.996 ps / nm·km, the dispersion coefficient of the second glass lens (2) is 44.246 to 44.696 ps / nm·km, the dispersion coefficient of the third plastic lens (3) is 54.312 to 56.392 ps / nm·km, and the dispersion coefficient of the fourth plastic lens (4) is 23.946 to 24.596 ps / nm·km.

7. The M12 fisheye high-pixel wide-angle lens according to claim 1, characterized in that, The first glass lens (1), the second glass lens (2), the third plastic lens (3), and the fourth plastic lens (4) are made of different materials.

8. The M12 fisheye high-pixel wide-angle lens according to claim 1, characterized in that, The total length of the M12 fisheye high-pixel wide-angle lens is 17.3–18.0 cm.

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