Optical lens and folding-super hybrid security lens

Abstract

The invention relates to the technical field of optical lenses, and particularly discloses an optical lens and a refraction-super hybrid security lens, which comprises five lenses with fixed positions and an infrared filter, and the first to fifth lenses and the infrared filter are sequentially arranged from an object side to an image side along an optical axis. Wherein the first lens is a negative lens, the second lens is a positive lens, the third lens is a positive lens, the fourth lens is a negative lens, and the fifth lens is a positive lens; according to the optical lens provided by the invention, the configuration of the first lens increases the light transmission amount, the configuration of the second lens gently converges the large-aperture light transmitted in front and reduces the system aperture, the configuration of the fourth lens and the fifth lens effectively shortens the total length of an optical imaging system, and the third lens and the fourth lens cooperate with each other to improve the imaging efficiency. Large-aperture light at the front end is received and smoothly transited to the rear end, so that the optical path difference between a center view field and an edge view field is shortened, paraxial spherical aberration can be effectively corrected, peripheral image scattering curvature is reduced, and resolving power is improved.

Description

Technical Field

[0001] This invention relates to the field of optical imaging technology, and more particularly to an optical lens and a hybrid refractive and hyperbolic security lens. Background Technology

[0002] In the field of security monitoring, optical lenses, as core visual components, play a crucial role, responsible for accurately capturing environmental data throughout the day and providing critical visual feedback to the system. The performance of the imaging lens directly determines the effectiveness of the entire security system, and its importance is self-evident. To improve the versatility of security lenses, they need to meet the requirements of high-definition imaging in different temperatures and all weather conditions while also having a smaller size to adapt to security equipment of different sizes, both indoors and outdoors. Although optical lenses are available on the market, they still fall short in meeting these high standards. Summary of the Invention

[0003] In view of this, in order to enable security lenses to have the characteristics of high definition, small size, infrared confocal, and no pyrolysis, the present invention provides an optical lens and a security lens with hybrid refractive and superconducting properties.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An optical lens includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, which are sequentially fixed along the optical axis from the object surface to the image surface. The object-side surface of the first lens is concave near the optical axis, and the image-side surface is also concave near the optical axis, making it a negative lens; The image-side surface of the second lens is convex near the optical axis, making it a positive lens; The object-side surface of the third lens is convex near the optical axis, and the image-side surface is convex near the optical axis, making it a positive lens; The object-side surface of the fourth lens is concave near the optical axis, and the image-side surface is convex near the optical axis, making it a negative lens; The image-side surface of the fifth lens is flat near the optical axis, making it a positive lens; The object-side and image-side surfaces of the first, second, third, and fourth lenses are all aspherical, and the fifth lens is a superlens, which can effectively reduce the lens thickness. At the same time, the five lenses do not contact each other or only contact each other at the edges, and cannot move from each other. The optical lens satisfies: The MTF of the full-field modulation function is greater than 52% at 100 lp / mm; Maximum field of view (FOVmax) ≥ 119°; Total optical length TTL≤14mm Operating wavelength: 400-850nm; TTL / f < 5.19, Where f is the focal length of the optical lens, and TTL is the total optical length of the optical lens. By controlling its size, the total length of the optical system can be effectively compressed, achieving miniaturization.

[0005] As a further improvement to the above technical solution: An optimized version of the above technical solution is that the optical lens satisfies the following: 0.51 <f123 / f<0.89; Controlling the above ratio can reduce the degree of light deflection during transmission, reduce the introduction of higher-order aberrations, and improve resolution.

[0006] 2.82 <f12 / f<14.12; Controlling this ratio helps to smoothly converge large-aperture light rays transmitted in front of the lens, reduce the introduction of higher-order aberrations, compress the system aperture, achieve smooth light transmission inside the optical lens, reduce the generation of higher-order aberrations, and improve the overall performance of the optical lens.

[0007] Where f123 is the combined focal length of the first, second, and third lenses, f12 is the combined focal length of the first and second lenses of the optical lens, and f is the effective focal length of the optical lens. Controlling these ratios allows for the reasonable allocation of optical power, reduces the deflection angle during light propagation, minimizes off-axis aberrations, and improves the overall performance of the lens.

[0008] An optimized version of the above technical solution is that the optical lens satisfies the following: 1.0.92 <|f45 / f12|<1.41; Wherein, f12 is the combined focal length of the first and second lenses of the optical lens, and f45 is the combined focal length of the fourth and fifth lenses of the optical lens. Controlling their ratio allows for a reasonable allocation of optical power, reducing the deflection angle during light propagation, minimizing off-axis aberrations, and improving the overall performance of the lens.

[0009] An optimized version of the above technical solution is that the optical lens satisfies the following: 0.81 < |f1 / f| < 1.12; 1.72 <f2 / f<2.07; 1.59 <f3 / f<1.85; Where f is the effective focal length of the optical lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, and f3 is the focal length of the third lens. Controlling their ratios can make the optical lens have low sensitivity and good imaging quality, while also making the optical lens have a shorter optical length.

[0010] An optimized version of the above technical solution is that the optical lens satisfies the following: 0.99 < |R3 / R4| < 1.02; R3 is the radius of curvature of the front surface of the second lens, and R4 is the radius of curvature of the rear surface of the second lens. Controlling their ratio can make the two sides of the second lens have similar shapes, smoothly transition the peripheral light, and help reduce the sensitivity of the lens.

[0011] An optimized version of the above technical solution is that the optical lens satisfies the following: 1.55 < |R5 / R6| < 3.87; R5 is the radius of curvature of the front surface of the third lens, and R6 is the radius of curvature of the rear surface of the third lens. Controlling their ratio can make the two sides of the third lens have similar shapes, smoothly transition the peripheral light, and help reduce the sensitivity of the lens.

[0012] An optimized version of the above technical solution is that the optical lens satisfies the following: 0.47 < |R7 / R8| < 0.83 Wherein, R7 is the radius of curvature of the front surface of the fourth lens, and R8 is the radius of curvature of the rear surface of the fourth lens. Controlling their ratio allows the two surfaces of the fourth lens to have similar shapes, resulting in a smooth transition of peripheral light and thus reducing lens sensitivity.

[0013] An optimized version of the above technical solution is that the optical lens satisfies the following: (CT12+ CT23+ CT34+CT45) / TTL<0.25; Wherein, CT12 is the air gap between the first lens and the second lens, CT23 is the air gap between the second lens and the third lens, CT34 is the air gap between the third lens and the fourth lens, CT45 is the air gap between the fourth lens and the fifth lens, and TTL is the total optical length of the optical lens. Controlling the above ratios can appropriately allocate the thickness of the lens, reduce the total length of the camera lens, and reduce the assembly difficulty of the camera lens, making the assembly process smooth and simple.

[0014] An optimized version of the above technical solution is that an aperture is provided on the image-side surface of the first lens, which can easily achieve high image quality and reduce the head size of the lens; and an infrared filter is provided between the fifth lens and the imaging surface.

[0015] The present invention also provides a hybrid refractive and hyperbolic security lens, which employs the aforementioned optical lens.

[0016] Compared with existing technologies, the beneficial effects of this invention are: The optical lens provided by this invention features a first lens configuration that compresses large-aperture light rays, increasing light transmission. A second lens configuration smoothly converges large-aperture light rays transmitted forward, helping to eliminate aberrations produced by the first lens and reducing the system aperture. The fourth and fifth lenses help to move the principal point of the optical system away from the image side, effectively shortening the overall length of the optical imaging system. The third and fourth lenses work together to receive large-aperture light rays from the front and smoothly transition them to the rear, shortening the optical path difference between the center and edge fields of view. This effectively corrects paraxial spherical aberration, reduces peripheral astigmatism curvature, and improves resolving power.

[0017] Meanwhile, the optical lens of this invention has advantages such as miniaturization, high resolution, calorific value, and infrared confocal focusing. The optical lens of this invention is suitable for monitoring equipment in different outdoor and indoor environments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the optical lens in Embodiment 1 of the present invention.

[0019] Figure 2 This is an MTF curve of the optical lens in Embodiment 1 of the present invention.

[0020] Figure 3 This is a defocusing curve of the optical lens in Embodiment 1 of the present invention at room temperature.

[0021] Figure 4 This is a defocus curve of the optical lens at 850nm wavelength according to Embodiment 1 of the present invention.

[0022] Figure 5 This is a defocusing curve of the optical lens in Embodiment 1 of the present invention at -30℃.

[0023] Figure 6 This is a defocus curve at 80°C for the optical lens of Embodiment 1 of the present invention.

[0024] Figure 7 This is a schematic diagram of the structure of the optical lens in Embodiment 2 of the present invention.

[0025] Figure 8 This is an MTF curve of the optical lens in Embodiment 2 of the present invention.

[0026] Figure 9 This is a defocusing curve of the optical lens in Embodiment 2 of the present invention at room temperature.

[0027] Figure 10 This is a defocus curve of the optical lens at 850nm wavelength according to Embodiment 2 of the present invention.

[0028] Figure 11 This is a defocus curve of the optical lens at -30℃ in Embodiment 2 of the present invention.

[0029] Figure 12 This is a defocusing curve at 80°C for the optical lens of Embodiment 2 of the present invention.

[0030] Figure 13 This is a schematic diagram of the structure of the optical lens in Embodiment 3 of the present invention.

[0031] Figure 14 This is an MTF curve of the optical lens in Embodiment 3 of the present invention.

[0032] Figure 15 This is a defocus curve of the optical lens in Embodiment 3 of the present invention at room temperature.

[0033] Figure 16 This is a defocus curve of the optical lens at 850nm wavelength in Embodiment 3 of the present invention.

[0034] Figure 17 This is a defocusing curve of the optical lens in Embodiment 3 of the present invention at -30℃.

[0035] Figure 18 This is a defocus curve at 80°C for the optical lens of Embodiment 3 of the present invention.

[0036] Figure descriptions: 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Aperture stop; 7. Infrared filter. Detailed Implementation

[0037] The technical solutions in the embodiments of this technical solution will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this technical solution, and not all embodiments.

[0038] In the description of this technical solution, unless otherwise stated, "multiple" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this technical solution and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this technical solution. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this technical solution, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this technical solution based on the specific circumstances.

[0040] In this technical solution, it should be noted that the object side of the lens refers to the side of the lens facing the object, and the image side refers to the side of the lens facing the imaging plane. When a cross-section is made at any point on the object side surface of the lens, if the object side surface is always located on the image side of the cross-section and its radius of curvature is positive, then the object side surface of the lens is convex; otherwise, the object side surface of the lens is concave. When a cross-section is made at any point on the image side surface of the lens, if the image side surface is always on the object side of the cross-section and its radius of curvature is negative, then the image side surface of the lens is convex; otherwise, the image side surface of the lens is concave. If a cross-section is made at any point on either the object side surface or the cross-section of the image side surface of the lens, and the object side surface or the image side surface is partially on the image side and partially on the object side of the cross-section, then the surface has a point of inflection. The above method still applies to determining the concavity or convexity of the object side and image side surfaces near the optical axis.

[0041] Furthermore, the equations for the aspherical curves of each aspherical lens are expressed as follows: Where Z is the distance vector from the origin of the aspherical surface at a height of r along the optical axis; c is the paraxial curvature of the aspherical surface (radius of curvature R = 1 / c, which is the reciprocal of curvature); k is the conic coefficient; Ai is the i-th order coefficient of the aspherical surface, and the higher order coefficients used in this invention are A4, A6, A8, A10, A12, A14, and A16.

[0042] Furthermore, the phase plane equations for each superlens are expressed as follows: Where Φ is the cumulative phase difference of the rays, N is the number of polynomial coefficients in the series, and Ai is the coefficient of ρ raised to the power of 2i. The number, ρ is the normalized radial aperture coordinate, and M is the diffraction order. The main component of this technical solution is the optical lens. This optical lens is then applied to security cameras. A detailed description of the optical lens is as follows: From the appendix Figure 1 , Figure 7 and Figure 13It can be seen that the lenses with optical power that are fixed in sequence from the object side to the image side along the optical axis are the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the infrared filter (7), and the imaging surface. In the attached figure, IMA is the imaging surface, and an aperture stop (6) is provided on the image side surface of the first lens (1).

[0043] The object-side surface of the first lens (1) is concave near the optical axis, and the image-side surface is concave near the optical axis, making it a negative lens. The first lens (1) has negative refractive power. Its object-side surface is concave near the optical axis to receive as much large-aperture light transmitted from the front as possible into the rear optical system. Its image-side surface is concave near the optical axis to quickly diffuse light into the rear optical system. The configuration of the first lens (1) can reduce light loss and increase illumination.

[0044] The image side surface of the second lens (2) is convex near the optical axis, and is a positive lens. The second lens (2) has positive refractive power, which is conducive to the convergence of light, which makes the physical aperture of the aperture (6) larger, achieving a greater amount of light transmission, which is conducive to increasing the illumination of the picture, and making the light emitted from L1 smoothly incident to the rear. The object-side surface of the third lens (3) is convex near the optical axis, and the image-side surface is convex near the optical axis, making it a positive lens; The object-side surface of the fourth lens (4) is concave near the optical axis, and the image-side surface is convex near the optical axis, making it a negative lens; The third lens (3) has positive refractive power, and the fourth lens (4) has negative refractive power. The third lens (3) and the fourth lens (4) work together to receive the large-aperture light from the front end and smoothly transition it to the rear end, shortening the optical path difference between the center and the edge fields of view, reducing distortion, and increasing illumination. At the same time, it can effectively correct paraxial spherical aberration, reduce peripheral astigmatism, and improve resolution.

[0045] The image-side surface of the fifth lens (5) is flat near the optical axis, making it a positive lens. The fifth lens (5) is a superlens with positive refractive power. Its object-side surface is flat near the optical axis, and its image-side surface is flat near the optical axis. This helps to move the principal point of the optical system away from the image-side end, thereby effectively shortening the overall length of the optical imaging system, effectively correcting paraxial spherical aberration, and reducing peripheral astigmatism curvature.

[0046] The five lenses do not contact each other or only contact at the edges, cannot move from each other, and the object-side and image-side surfaces of each lens are aspherical, which can effectively reduce the lens thickness. At the same time, the optical lens must meet the following requirements: TTL / f < 5.19; 0.51 <f123 / f<0.89; 2.82 <f12 / f<14.12; 1.0.92 <|f45 / f12|<1.41; 0.81 < |f1 / f| < 1.12; 1.72 <f2 / f<2.07; 1.59 <f3 / f<1.85; 0.99 < |R3 / R4| < 1.02; 1.55 < |R5 / R6| < 3.87; 0.47 < |R7 / R8| < 0.83; (CT12+ CT23+ CT34+CT45) / TTL<0.25; Where f is the focal length of the optical lens, TTL is the total optical length of the optical lens, f123 is the combined focal length of the first lens (1), the second lens (2) and the third lens (3), f12 is the combined focal length of the first and second lenses (2) of the optical lens, f45 is the combined focal length of the fourth lens (4) and the fifth lens (5) of the optical lens, f1 is the focal length of the first lens (1), f2 is the focal length of the second lens (2), f3 is the focal length of the third lens (3), R3 is the radius of curvature of the front surface of the second lens (2), R4 is the radius of curvature of the rear surface of the second lens (2), R5 is the radius of curvature of the front surface of the third lens (3), R 6 is the radius of curvature of the rear surface of the third lens (3), R7 is the radius of curvature of the front surface of the fourth lens (4), R8 is the radius of curvature of the rear surface of the fourth lens (4), CT12 is the air gap between the first lens (1) and the second lens (2), CT23 is the air gap between the second lens (2) and the third lens (3), CT34 is the air gap between the third lens (3) and the fourth lens (4), and CT45 is the air gap between the fourth lens (4) and the fifth lens (5).

[0047] Example 1 As attached Figure 1 As shown, based on the above parameter formula, a set of optical lenses is obtained. The specific design parameters of this embodiment are as follows: The remaining detailed parameters related to aspherical surfaces are shown in the table below: The remaining detailed parameters of the superlens are shown in the table below: Figure 2This is the MTF curve of this embodiment. As shown in the figure, the MTF of the full field of view modulation function is greater than 52% at 100 lp / mm, which has high clarity. Figure 3 This is the defocus curve diagram of the conventional configuration in this embodiment. As shown in the figure, the defocus offset of each field of view is controlled within 8μm, and the overall field curvature is small.

[0048] Figure 4 This is the 850nm wavelength defocus curve of this embodiment. Compared with the conventional configuration, the infrared defocus offset is controlled within 9.5μm, which has a better infrared confocal effect.

[0049] Figure 5 This is the defocus curve at -30℃ in this embodiment. Compared with the conventional state, the defocus offset is controlled within 3μm, which has a better low temperature resistance effect.

[0050] Figure 6 This is the defocus curve at +80℃ in this embodiment. Compared with the conventional state, the defocus offset is controlled within 3μm, which has a better high temperature resistance effect.

[0051] Example 2 As attached Figure 7 As shown, based on the above parameter formula, a set of optical lenses is obtained. The specific design parameters of this embodiment are as follows: The remaining detailed parameters related to aspherical surfaces are shown in the table below: The remaining detailed parameters of the superlens are shown in the table below: Figure 8 This is the MTF curve of this embodiment. As shown in the figure, the MTF of the full field of view modulation function is greater than 59% at 100 lp / mm, which has high clarity. Figure 9 This is the defocus curve diagram of the conventional configuration in this embodiment. As shown in the figure, the defocus offset of each field of view is controlled within 8μm, and the overall field curvature is small.

[0052] Figure 10 This is the 850nm wavelength defocus curve of this embodiment. Compared with the conventional configuration, the infrared defocus offset is controlled within 7μm, which has a better infrared confocal effect.

[0053] Figure 11 This is the defocus curve at -30℃ in this embodiment. Compared with the conventional state, the defocus offset is controlled within 2μm, which has a better low temperature resistance effect.

[0054] Figure 12 This is the defocus curve at +80℃ in this embodiment. Compared with the conventional state, the defocus offset is controlled within 2μm, which has a better high temperature resistance effect.

[0055] Example 3 As attached Figure 13 As shown, based on the above parameter formula, a set of optical lenses is obtained. The specific design parameters of this embodiment are as follows: The remaining detailed parameters related to aspherical surfaces are shown in the table below: The remaining detailed parameters of the superlens are shown in the table below: Figure 14 This is the MTF curve of this embodiment. As shown in the figure, the MTF of the full field of view modulation function is greater than 59% at 100 lp / mm, which has high clarity. Figure 15 This is the defocus curve diagram of the conventional configuration in this embodiment. As shown in the figure, the defocus offset of each field of view is controlled within 10μm, and the overall field curvature is small.

[0056] Figure 16 This is the 850nm wavelength defocus curve of this embodiment. Compared with the conventional configuration, the infrared defocus offset is controlled within 5.5μm, which has a better infrared confocal effect.

[0057] Figure 17 This is the defocus curve at -30℃ in this embodiment. Compared with the conventional state, the defocus offset is controlled within 2μm, which has a better low temperature resistance effect.

[0058] Figure 18 This is the defocus curve at +80℃ in this embodiment. Compared with the conventional state, the defocus offset is controlled within 2μm, which has a better high temperature resistance effect.

[0059] In summary, the aforementioned optical lens employs a structure of four plastic lenses plus one superlens. The total optical length (TTL) is ≤14mm, the maximum field of view (FOVmax) is ≥119°, the focal length (f) is ≥2.69mm, the full-field modulation function (MTF) is greater than 52% at 100lp / mm, the operating wavelength is 400-850nm, and the defocus shift in the 850nm infrared band is controlled within 9.5 micrometers, exhibiting good infrared confocal performance and supporting both day and night use. Under extreme temperature conditions ranging from -30℃ to +80℃, the center defocus shift is within 3μm, demonstrating a heat-free effect unaffected by high or low temperatures. This optical lens offers advantages such as miniaturization, high resolution, infrared confocal performance, and heat-free operation, while also possessing excellent optical imaging capabilities. The above are merely preferred embodiments of this technical solution, but the scope of protection of this technical solution is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this technical solution, based on the technical solution and its concept, should be included within the scope of protection of this technical solution.

Claims

1. An optical lens, comprising a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), and a fifth lens (5) sequentially fixed along the optical axis from the object surface to the image surface, characterized in that, The object-side surface of the first lens (1) is concave near the optical axis, and the image-side surface is concave near the optical axis, making it a negative lens; The image-side surface of the second lens (2) is convex near the optical axis, and is a positive lens; The object-side surface of the third lens (3) is convex near the optical axis, and the image-side surface is convex near the optical axis, making it a positive lens; The object-side surface of the fourth lens (4) is concave near the optical axis, and the image-side surface is convex near the optical axis, making it a negative lens; The image-side surface of the fifth lens (5) is flat near the optical axis, and is a positive lens. The object-side surface and image-side surface of the first lens (1), the second lens (2), the third lens (3) and the fourth lens (4) are all aspherical, and the fifth lens (5) is a superlens; The optical lens satisfies: The MTF of the full-field modulation function is greater than 52% at 100 lp / mm; Maximum field of view (FOVmax) ≥ 119°; Total optical length TTL≤14mm Operating wavelength: 400-850nm; TTL / f < 5.19, Where f is the focal length of the optical lens, and TTL is the total optical length of the optical lens.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 0.51 <f123 / f<0.89; 2.82 <f12 / f<14.12; Wherein, f123 is the combined focal length of the first lens (1), the second lens (2) and the third lens (3), f12 is the combined focal length of the first lens (1) and the second lens (2), and f is the effective focal length of the optical lens.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 1.0.92 <|f45 / f12|<1.41; Wherein, f12 is the combined focal length of the first and second lenses (2) of the optical lens, and f45 is the combined focal length of the fourth lens (4) and the fifth lens (5).

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 0.81 < |f1 / f| < 1.12; 1.72 <f2 / f<2.07; 1.59 <f3 / f<1.85; Where f is the effective focal length of the optical lens, f1 is the focal length of the first lens (1), f2 is the focal length of the second lens (2), and f3 is the focal length of the third lens (3).

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 0.99 < |R3 / R4| < 1.02; Wherein, R3 is the radius of curvature of the front surface of the second lens (2), and R4 is the radius of curvature of the rear surface of the second lens (2).

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 1.55 < |R5 / R6| < 3.87; Wherein, R5 is the radius of curvature of the front surface of the third lens (3), and R6 is the radius of curvature of the rear surface of the third lens (3).

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 0.47 < |R7 / R8| < 0.83 R7 is the radius of curvature of the front surface of the fourth lens (4), and R8 is the radius of curvature of the rear surface of the fourth lens (4).

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies: (CT12+ CT23+ CT34+CT45) / TTL<0.25; Wherein, CT12 is the air gap between the first lens (1) and the second lens (2), CT23 is the air gap between the second lens (2) and the third lens (3), CT34 is the air gap between the third lens (3) and the fourth lens (4), CT45 is the air gap between the fourth lens (4) and the fifth lens (5), and TTL is the total optical length of the optical lens.

9. The optical lens according to claim 1, characterized in that, An aperture stop (6) is provided on the image side surface of the first lens (1), and an infrared filter (7) is provided between the fifth lens (5) and the imaging surface.

10. A security lens with a hybrid folding and supersonic capabilities, characterized in that, A security lens employing the optical lens described in any one of claims 1 to 9 is described.

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