A high-performance infrared confocal ultra-clear security lens

Abstract

The present invention discloses a high-performance infrared confocal ultra-clear security lens, which includes a first lens to a fifteenth lens; the first lens to the fifteenth lens each include an object side surface and an image side surface; the first lens to the third lens are a fixed lens group; the fourth lens to the sixth lens are a variable magnification lens group; the seventh lens to the ninth lens are a fixed lens group; the tenth lens to the fifteenth lens are a compensation lens group; the optical imaging lens has only the above fifteen lenses with refractive power. The present invention adopts a large light-through design to ensure that the relative illumination of the edge of the imaging surface is uniform; the entire system adopts non-thermal optimization, and under the condition of focusing at room temperature, high and low temperatures are not out of focus; the chromatic aberration is well optimized, with good image color reproduction, and no blue-purple edge phenomenon; the TTL is very short, and the total length of the structure is short; the resolution is high, the edge imaging is clear, and it can meet the 4K requirements, and the image quality is clear and stable; it has good infrared confocality, and can ensure clear imaging in night mode.

Description

Technical Field

[0001] The invention relates to the technical field of lenses, and in particular to a high-performance infrared confocal ultra-clear security lens. Background Art

[0002] Security lenses generally refer to surveillance lenses of surveillance cameras. Security lenses are widely used because of their high sensitivity, strong light resistance, small distortion, small size, long life, and vibration resistance. Existing security lenses still have many shortcomings, such as: the light transmission of zoom lenses in this focal length segment is relatively small, the aperture value is generally greater than 2.2 for short focal length, 3 for long focal length, or even greater, and the relative illumination at the edge of the imaging surface is low; the operating temperature range that zoom lenses in this focal length segment can support is very small, and when used in high and low temperature environments, the defocus is very serious; the general chromatic aberration optimization of the lens is insufficient, and blue-purple fringing is prone to occur; the TTL of zoom lenses in this focal length segment is relatively large, and the total length of the structure is also relatively long; the resolution of zoom lenses in this focal length segment is not high, and the edge imaging is not clear; the focus of zoom lenses in this focal length segment is visible, and the infrared imaging effect is poor. Summary of the invention

[0003] The purpose of the present invention is to provide a high-performance infrared confocal ultra-clear security lens to solve the above-mentioned technical problems.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A high-performance infrared confocal ultra-clear security lens, comprising a first lens to a fifteenth lens in sequence from an object side to an image side along an optical axis; each of the first lens to the fifteenth lens comprises an object-side surface facing the object side and allowing imaging light to pass through, and an image-side surface facing the image side and allowing imaging light to pass through;

[0006] The first lens has a negative refractive power, the object side surface of the first lens is convex, and the image side surface is concave; the second lens has a positive refractive power, the object side surface of the second lens is convex, and the image side surface is convex; the third lens has a positive refractive power, the object side surface of the third lens is convex, and the image side surface is concave; the first lens to the third lens are a fixed lens group;

[0007] The fourth lens has a negative refractive power, and the object side surface and the image side surface of the fourth lens are concave; the fifth lens has a negative refractive power, and the object side surface and the image side surface of the fifth lens are concave; the sixth lens has a positive refractive power, and the object side surface and the image side surface of the sixth lens are convex and concave; the fourth lens to the sixth lens form a variable power lens group;

[0008] The seventh lens has a positive refractive power, and the object side surface and the image side surface of the seventh lens are convex; the eighth lens has a positive refractive power, and the object side surface and the image side surface of the eighth lens are convex; the ninth lens has a negative refractive power, and the object side surface and the image side surface of the ninth lens are concave; the seventh to ninth lenses are a fixed lens group;

[0009] The tenth lens has a positive refractive power, and the object side surface of the tenth lens is convex, and the image side surface is concave; the eleventh lens has a positive refractive power, and the object side surface of the eleventh lens is convex, and the image side surface is convex; the twelfth lens has a negative refractive power, and the object side surface of the twelfth lens is concave, and the image side surface is concave; the thirteenth lens has a positive refractive power, and the object side surface of the thirteenth lens is convex, and the image side surface is concave; the fourteenth lens has a positive refractive power, and the object side surface of the fourteenth lens is convex, and the image side surface is convex; the fifteenth lens has a negative refractive power, and the object side surface of the fifteenth lens is concave, and the image side surface is convex; the tenth to fifteenth lenses are a compensation lens group;

[0010] The optical imaging lens has only the fifteen lenses having the refractive powers mentioned above.

[0011] Preferably, the image side surface of the first lens and the object side surface of the second lens are glued to each other, the image side surface of the fifth lens and the object side surface of the sixth lens are glued to each other, the image side surface of the eighth lens and the object side surface of the ninth lens are glued to each other, and the image side surface of the twelfth lens and the object side surface of the thirteenth lens are glued to each other.

[0012] Preferably, both the object-side surface and the image-side surface of the eleventh lens are aspherical surfaces.

[0013] Preferably, the following condition is met: |vd1-vd2|>30, wherein vd1 is the dispersion coefficient of the first lens, and vd2 is the dispersion coefficient of the second lens.

[0014] Preferably, the following condition is met: |vd5-vd6|>30, wherein vd5 is the dispersion coefficient of the fifth lens, and vd6 is the dispersion coefficient of the sixth lens.

[0015] Preferably, the following condition is met: |vd8-vd9|>30, wherein vd8 is the dispersion coefficient of the eighth lens, and vd9 is the dispersion coefficient of the ninth lens.

[0016] Preferably, the following condition is met: |vd12-vd13|>30, wherein vd12 is the dispersion coefficient of the twelfth lens, and vd13 is the dispersion coefficient of the thirteenth lens.

[0017] Preferably, the following conditions are met: 1.55<fw / BFLw<1.68, 3.91<ft / BFLt<4.03, wherein fw is the shortest focal length of the lens, BFLw is the back focal length at the shortest focal length, ft is the longest focal length of the lens, and BFLt is the back focal length at the longest focal length.

[0018] Preferably, the optical system further comprises an aperture, wherein the aperture is arranged between the sixth lens and the seventh lens.

[0019] Preferably, the following condition is met: TTL<64 mm, wherein TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis.

[0020] After adopting the above technical solution, the present invention has the following advantages compared with the background technology:

[0021] The present invention adopts a large light-through design, and the relative illumination at both ends of the long and short focal lengths can be greater than 50% in the edge field of view, ensuring uniform relative illumination at the edge of the imaging surface; the entire system adopts athermal optimization, and under the condition of focusing at room temperature, it will not lose focus at high or low temperatures, and can work in an environment of -30℃-70℃; the chromatic aberration is very well optimized, with good image color reproduction and no blue-purple edge phenomenon; the TTL is very short, and the overall length of the structure is short; the resolution is high, the edge imaging is clear, which can meet 4K requirements, and the image quality is clear and stable; it has good infrared confocality, and can ensure clear imaging even in night mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The optical path diagram of the lens when the first embodiment is at the shortest focal length;

[0023] Figure 2 is the MTF diagram of the lens in Example 1 under visible light when it is at the shortest focal length;

[0024] Figure 3 is a defocus curve diagram of the lens in Example 1 under visible light when the lens is at the shortest focal length;

[0025] Figure 4 is a relative illumination curve diagram under visible light when the lens is at the shortest focal length in Example 1;

[0026] Figure 5 is an axial chromatic aberration curve diagram when the lens is at the shortest focal length in Example 1;

[0027] Figure 6 is a defocus curve diagram of the lens in Example 1 at the infrared 0.850 μm when the lens is at the shortest focal length;

[0028] Figure 7 This is the optical path diagram of Example 1 when it is at the longest focal length;

[0029] Figure 8 is the MTF diagram of the lens in Example 1 under visible light when it is at the longest focal length;

[0030] Fig. 9 is a defocus curve diagram of the lens in Example 1 under visible light when the lens is at the longest focal length;

[0031] Fig.10 is a relative illumination curve diagram under visible light when the lens is at the longest focal length in Example 1;

[0032] Fig.11 is a defocus curve diagram of the lens in Example 1 at the longest focal length under infrared 0.850 μm;

[0033] Fig.12 This is the optical path diagram of the lens when the second embodiment is at the shortest focal length;

[0034] Fig.13 is the MTF diagram of the lens in Example 2 under visible light when it is at the shortest focal length;

[0035] Fig.14 is a defocus curve diagram of the lens in Example 2 under visible light when the lens is at the shortest focal length;

[0036] Fig.15 is a relative illumination curve diagram under visible light when the lens is at the shortest focal length in Example 2;

[0037] Fig.16 is an axial chromatic aberration curve diagram when the lens is at the shortest focal length in Example 2;

[0038] Fig.17 is a defocus curve diagram of the lens in Example 2 at the infrared 0.850 μm when the lens is at the shortest focal length;

[0039] Fig.18 This is a light path diagram of the lens when the second embodiment is at the longest focal length;

[0040] Fig.19 is the MTF diagram of the lens in Example 2 under visible light when it is at the longest focal length;

[0041] Fig. 20 is a defocus curve diagram of the lens in Example 2 under visible light when the lens is at the longest focal length;

[0042] Fig.21 is a relative illumination curve diagram under visible light when the lens is at the longest focal length in Example 2;

[0043] Fig. 22 is a defocus curve diagram of the lens in Example 2 at the longest focal length under infrared 0.850 μm;

[0044] Fig.23This is the optical path diagram of the lens when the third embodiment is at the shortest focal length;

[0045] Fig.24 is the MTF diagram of the lens in Example 3 under visible light when it is at the shortest focal length;

[0046] Fig.25 is a defocus curve diagram of the lens under visible light when the lens is at the shortest focal length in Example 3;

[0047] Fig.26 is a relative illumination curve diagram under visible light when the lens is at the shortest focal length in Example 3;

[0048] Fig. 27 is an axial chromatic aberration curve diagram when the lens is at the shortest focal length in Example 3;

[0049] Fig.28 is a defocus curve diagram of the lens in Example 3 at the infrared 0.850 μm when the lens is at the shortest focal length;

[0050] Fig.29 This is a light path diagram of the lens when the third embodiment is at the longest focal length;

[0051] Fig.30 is the MTF diagram of the lens in Example 3 under visible light when it is at the longest focal length;

[0052] Fig.31 is a defocus curve diagram of the lens under visible light when the lens is at the longest focal length in Example 3;

[0053] Fig.32 is a relative illumination curve diagram under visible light when the lens is at the longest focal length in Example 3;

[0054] Fig.33 This is a defocus curve diagram of the lens at the longest focal length in Example 3 at 0.850 μm in infrared;

[0055] Fig.34 This is a light path diagram of the lens when the fourth embodiment is at the shortest focal length;

[0056] Fig.35 is the MTF diagram of the lens in Example 4 under visible light when it is at the shortest focal length;

[0057] Fig.36 is a defocus curve diagram of the lens in Example 4 under visible light when the lens is at the shortest focal length;

[0058] Fig.37 is a relative illumination curve diagram under visible light when the lens is at the shortest focal length in Example 4;

[0059] Fig.38is an axial chromatic aberration curve diagram when the lens is at the shortest focal length in Example 4;

[0060] Fig.39 is a defocus curve diagram of the fourth embodiment when the lens is at the shortest focal length at infrared 0.850 μm;

[0061] Fig.40 This is a light path diagram of the lens when the fourth embodiment is at the longest focal length;

[0062] Fig.41 is the MTF diagram of the lens in Example 4 under visible light when it is at the longest focal length;

[0063] Fig.42 is a defocus curve diagram of the lens in Example 4 under visible light when the lens is at the longest focal length;

[0064] Fig.43 is a relative illumination curve diagram under visible light when the lens is at the longest focal length in Example 4;

[0065] Fig.44 This is a defocus curve diagram of the fourth embodiment when the lens is at the longest focal length at infrared 0.850 μm.

[0066] Description of reference numerals:

[0067] A first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13, a fourteenth lens 14, a fifteenth lens 15, an aperture 16, and a protective glass 17. DETAILED DESCRIPTION

[0068] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0069] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0070] In this specification, "a lens having a positive refractive power (or a negative refractive power)" means that the paraxial refractive power of the lens calculated by Gaussian optical theory is positive (or negative). The "object side (or image side) of the lens" is defined as a specific range of the lens surface through which the imaging light passes. The concave and convex shape of the lens can be judged according to the judgment method of ordinary knowledge in this field, that is, the concave and convex shape of the lens surface can be judged by the positive and negative signs of the radius of curvature (abbreviated as R value). R value can be commonly used in optical design software, such as Zemax or CodeV. R value is also commonly found in the lens data sheet (lensdatasheet) of optical design software. For the object side, when the R value is positive, the object side is judged to be convex; when the R value is negative, the object side is judged to be concave. Conversely, for the image side, when the R value is positive, the image side is judged to be concave; when the R value is negative, the image side is judged to be convex.

[0071] The present invention discloses a high-performance infrared confocal ultra-clear security lens, which includes a first lens to a fifteenth lens in sequence from the object side to the image side along an optical axis; the first lens to the fifteenth lens each include an object side surface facing the object side and allowing imaging light to pass through, and an image side surface facing the image side and allowing imaging light to pass through;

[0072] The first lens has a negative refractive power, the object side surface of the first lens is convex, and the image side surface is concave; the second lens has a positive refractive power, the object side surface of the second lens is convex, and the image side surface is convex; the third lens has a positive refractive power, the object side surface of the third lens is convex, and the image side surface is concave; the first lens to the third lens are a fixed lens group;

[0073] The fourth lens has a negative refractive power, and the object side surface and the image side surface of the fourth lens are concave; the fifth lens has a negative refractive power, and the object side surface and the image side surface of the fifth lens are concave; the sixth lens has a positive refractive power, and the object side surface and the image side surface of the sixth lens are convex and concave; the fourth lens to the sixth lens form a variable power lens group;

[0074] The seventh lens has a positive refractive power, and the object side surface and the image side surface of the seventh lens are convex; the eighth lens has a positive refractive power, and the object side surface and the image side surface of the eighth lens are convex; the ninth lens has a negative refractive power, and the object side surface and the image side surface of the ninth lens are concave; the seventh to ninth lenses are a fixed lens group;

[0075] The tenth lens has a positive refractive power, and the object side surface of the tenth lens is convex, and the image side surface is concave; the eleventh lens has a positive refractive power, and the object side surface of the eleventh lens is convex, and the image side surface is convex; the twelfth lens has a negative refractive power, and the object side surface of the twelfth lens is concave, and the image side surface is concave; the thirteenth lens has a positive refractive power, and the object side surface of the thirteenth lens is convex, and the image side surface is concave; the fourteenth lens has a positive refractive power, and the object side surface of the fourteenth lens is convex, and the image side surface is convex; the fifteenth lens has a negative refractive power, and the object side surface of the fifteenth lens is concave, and the image side surface is convex; the tenth to fifteenth lenses are a compensation lens group;

[0076] The optical imaging lens has only the fifteen lenses having the refractive powers mentioned above.

[0077] Preferably, the image side surface of the first lens and the object side surface of the second lens are glued to each other, the image side surface of the fifth lens and the object side surface of the sixth lens are glued to each other, the image side surface of the eighth lens and the object side surface of the ninth lens are glued to each other, and the image side surface of the twelfth lens and the object side surface of the thirteenth lens are glued to each other.

[0078] Preferably, both the object-side surface and the image-side surface of the eleventh lens are aspherical surfaces, which can better correct spherical aberration and higher-order aberrations and improve the relative illumination of the imaging.

[0079] Preferably, the following condition is met: |vd1-vd2|>30, wherein vd1 is the dispersion coefficient of the first lens, and vd2 is the dispersion coefficient of the second lens, which can better optimize chromatic aberration.

[0080] Preferably, the following condition is met: |vd5-vd6|>30, wherein vd5 is the dispersion coefficient of the fifth lens, and vd6 is the dispersion coefficient of the sixth lens, which can better optimize chromatic aberration.

[0081] Preferably, the following condition is met: |vd8-vd9|>30, wherein vd8 is the dispersion coefficient of the eighth lens, and vd9 is the dispersion coefficient of the ninth lens, which can better optimize chromatic aberration.

[0082] Preferably, the following condition is met: |vd12-vd13|>30, wherein vd12 is the dispersion coefficient of the twelfth lens, and vd13 is the dispersion coefficient of the thirteenth lens, which can better optimize chromatic aberration.

[0083] Preferably, the following conditions are met: 1.55<fw / BFLw<1.68, 3.91<ft / BFLt<4.03, wherein fw is the shortest focal length of the lens, BFLw is the back focal length at the shortest focal length, ft is the longest focal length of the lens, and BFLt is the back focal length at the longest focal length, thereby further realizing a large focal length span.

[0084] Preferably, the optical system further comprises an aperture, wherein the aperture is arranged between the sixth lens and the seventh lens.

[0085] Preferably, the following condition is met: TTL<64mm, wherein TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis. The lens has a compact structure and is suitable for more scenes.

[0086] The security lens of the present invention will be described in detail below with reference to specific embodiments.

[0087] Embodiment 1

[0088] refer to Figure 1 As shown, this embodiment discloses a high-performance infrared confocal ultra-clear security lens, which includes a first lens to a fifteenth lens in sequence along an optical axis from an object side A1 to an image side A2; the first lens to the fifteenth lens each include an object side surface facing the object side A1 and allowing imaging light to pass through, and an image side surface facing the image side A2 and allowing imaging light to pass through;

[0089] The first lens 1 has a negative refractive power, and the object side surface of the first lens 1 is convex, and the image side surface is concave; the second lens 2 has a positive refractive power, and the object side surface of the second lens 2 is convex, and the image side surface is convex; the third lens 3 has a positive refractive power, and the object side surface of the third lens 3 is convex, and the image side surface is concave; the first lens 1 to the third lens 3 are a fixed lens group, which is relatively fixed relative to the aperture 16 on the optical axis;

[0090] The fourth lens 4 has a negative refractive power, and the object side surface and the image side surface of the fourth lens 4 are concave; the fifth lens 5 has a negative refractive power, and the object side surface and the image side surface of the fifth lens 5 are concave; the sixth lens 6 has a positive refractive power, and the object side surface and the image side surface of the sixth lens 6 are convex; the fourth lens 4 to the sixth lens 6 are a variable magnification lens group, which can be relatively moved relative to the aperture 16 on the optical axis to play the function of zooming and magnification;

[0091] The seventh lens 7 has a positive refractive power, and the object side surface of the seventh lens 7 is convex, and the image side surface is convex; the eighth lens 8 has a positive refractive power, and the object side surface of the eighth lens 8 is convex, and the image side surface is convex; the ninth lens 9 has a negative refractive power, and the object side surface of the ninth lens 9 is concave, and the image side surface is concave; the seventh lens 7 to the ninth lens are a fixed lens group, which is relatively fixed relative to the aperture 16 on the optical axis;

[0092] The tenth lens 10 has a positive refractive power, and the object side surface of the tenth lens 10 is convex, and the image side surface is concave; the eleventh lens 11 has a positive refractive power, and the object side surface of the eleventh lens 11 is convex, and the image side surface is convex; the twelfth lens 12 has a negative refractive power, and the object side surface of the twelfth lens 12 is concave, and the image side surface is concave; the thirteenth lens 13 has a positive refractive power, and the object side surface of the thirteenth lens 13 is convex, and the image side surface is concave; the fourteenth lens 14 has a positive refractive power, and the object side surface of the fourteenth lens 14 is convex, and the image side surface is convex; the fifteenth lens 15 has a negative refractive power, and the object side surface of the fifteenth lens 15 is concave, and the image side surface is convex; the tenth lens 10 to the fifteenth lens 15 are a compensation lens group, which can be relatively moved relative to the aperture 16 on the optical axis to assume the function of refocusing;

[0093] The optical imaging lens has only the fifteen lenses having the refractive powers mentioned above.

[0094] In this embodiment, the aperture 16 is arranged between the seventh lens 7 and the eighth lens 8, the image side surface of the first lens 1 and the object side surface of the second lens 2 are glued to each other, the image side surface of the fifth lens 5 and the object side surface of the sixth lens 6 are glued to each other, the image side surface of the eighth lens 8 and the object side surface of the ninth lens 9 are glued to each other, and the image side surface of the twelfth lens 12 and the object side surface of the thirteenth lens 13 are glued to each other.

[0095] The detailed optical data of this specific embodiment are shown in Table 1.

[0096] Table 1 Detailed optical data of Example 1

[0097]

[0098] In this specific embodiment, the eleventh lens 11 is an aspherical lens, and the equations of the object side surface and the image side surface curves of the eleventh lens 11 are expressed as follows:

[0099]

[0100] in:

[0101] z: Depth of the aspherical surface (the vertical distance between the point on the aspherical surface that is y away from the optical axis and the tangent plane that is tangent to the vertex on the optical axis of the aspherical surface);

[0102] c: the vertex curvature of the aspherical surface;

[0103] K: Conic Constant;

[0104] , radial distance;

[0105] r n : normalization radius (NRADIUS);

[0106] u:r / r n ;

[0107] am: mth order Q con Coefficient (is the m th Q con coefficient);

[0108] Q m con : mth order Q con Polynomial th Q con polynomial).

[0109] Please refer to the following table for detailed parameter data of the aspheric surface of the eleventh lens 11:

[0110]

[0111] In this specific embodiment, the focal length of the zoom lens at short focus is fw=12.5014mm, and the focal length at long focus is ft=38.0093; the aperture value FNO=1.89-2.04; at short focus, TTLw=63.850mm, at long focus, TTLt=63.850mm; fw / BFLw=1.590744887, ft / BFLt=3.918758041; the image plane size is 1.8 inches.

[0112] For the resolution of this embodiment, please refer to Figure 2 and Figure 8 From the figure, we can see that the transmission function is well controlled and the resolution is high. When in use, the MTF value of the spatial frequency 200lp / mm is still greater than 0.2, which meets the requirements of picture clarity. For the confocality of visible light and infrared, please refer to Figure 3 , Figure 6 , Fig. 9 and Fig.11 It can be seen that the visible light and infrared light have good confocality, and the infrared defocus (IRshift) is less than 10μm, which can ensure clear imaging even in night mode; please refer to axial chromatic aberration Figure 5 , axial chromatic aberration is less than ±0.03mm, good color reproduction, no blue-purple edge phenomenon; please refer to the relative illumination curve Figure 4 and 10 , it can be seen that the relative illumination is high. In normal use, the relative illumination is greater than 50%.

[0113] Embodiment 2

[0114] Cooperate Figures 12 to 22 As shown, the surface profile and refractive power of each lens in this embodiment and the first embodiment are substantially the same, but the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0115] The detailed optical data of this specific embodiment are shown in Table 2.

[0116] Table 2 Detailed optical data of Example 2

[0117]

[0118] For detailed parameter data of the aspheric surface of the eleventh lens 11 in this specific embodiment, please refer to the following table:

[0119]

[0120] In this specific embodiment, the focal length of the zoom lens at short focus is fw=12.4555mm, and the focal length at long focus is ft=38.0196; the aperture value FNO=1.89-2.02; at short focus, TTLw=63.850mm, at long focus, TTLt=63.850mm; fw / BFLw=1.681123342, ft / BFLt=4.267692899; the image plane size is 1.8 inches.

[0121] For the resolution of this embodiment, please refer to Fig.13 and Fig.19 From the figure, we can see that the transmission function is well controlled and the resolution is high. When in use, the MTF value of the spatial frequency 200lp / mm is still greater than 0.2, which meets the requirements of picture clarity. For the confocality of visible light and infrared, please refer to Fig.14 , Fig.17 , Fig. 20 and Fig. 22 It can be seen that the visible light and infrared light have good confocality, and the infrared defocus (IR shift) is less than 10μm, which can ensure clear imaging even in night mode; please refer to axial chromatic aberration Fig.16 , axial chromatic aberration is less than ±0.03mm, good color reproduction, no blue-purple edge phenomenon; please refer to the relative illumination curve Fig.15 and 21 , it can be seen that the relative illumination is high. In normal use, the relative illumination is greater than 50%.

[0122] Embodiment 3

[0123] Cooperate Figure 23 to Figure 33 As shown, the surface profile and refractive power of each lens in this embodiment and the first embodiment are substantially the same, but the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0124] The detailed optical data of this specific embodiment are shown in Table 3.

[0125] Table 3 Detailed optical data of Example 3

[0126]

[0127] For detailed parameter data of the aspheric surface of the eleventh lens 11 in this specific embodiment, please refer to the following table:

[0128]

[0129] In this specific embodiment, the focal length of the zoom lens at short focus is fw=12.5017mm, and the focal length at long focus is ft=38.0037; the aperture value FNO=1.89-2.00; at short focus, TTLw=63.950mm, at long focus, TTLt=63.950mm; fw / BFLw=1.595614266, ft / BFLt=3.942555504; the image plane size is 1.8 inches.

[0130] For the resolution of this embodiment, please refer to Fig.24 and Fig.30 From the figure, we can see that the transmission function is well controlled and the resolution is high. When in use, the MTF value of the spatial frequency 200lp / mm is still greater than 0.2, which meets the requirements of picture clarity. For the confocality of visible light and infrared, please refer to Fig.25 , Fig.28 , Fig.31 and Fig.33 It can be seen that the visible light and infrared light have good confocality, and the infrared defocus (IR shift) is less than 10μm, which can ensure clear imaging even in night mode; please refer to axial chromatic aberration Fig. 27 , axial chromatic aberration is less than ±0.03mm, good color reproduction, no blue-purple edge phenomenon; please refer to the relative illumination curve Fig.26 and 32 , it can be seen that the relative illumination is high. In normal use, the relative illumination is greater than 55%.

[0131] Embodiment 4

[0132] Cooperate Figures 34 to 44 As shown, the surface profile and refractive power of each lens in this embodiment and the first embodiment are substantially the same, but the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0133] The detailed optical data of this specific embodiment are shown in Table 4.

[0134] Table 4 Detailed optical data of Example 4

[0135]

[0136] For detailed parameter data of the aspheric surface of the eleventh lens 11 in this specific embodiment, please refer to the following table:

[0137]

[0138] In this specific embodiment, the focal length of the zoom lens at short focus is fw=12.5016mm, and the focal length at long focus is ft=38.0058; the aperture value FNO=1.89-2.01; at short focus, TTLw=63.941mm, at long focus, TTLt=63.941mm; fw / BFLw=1.601286193, ft / BFLt=4.034208262; the image plane size is 1.8 inches.

[0139] For the resolution of this embodiment, please refer to Fig.33 and Fig.41 From the figure, we can see that the transmission function is well controlled and the resolution is high. When in use, the MTF value of the spatial frequency 200lp / mm is greater than 0.2, which meets the requirements of picture clarity. For the confocality of visible light and infrared, please refer to Fig.36 , Fig.39 , Fig.42 and Fig.44 It can be seen that the visible light and infrared light have good confocality, and the infrared defocus (IRshift) is less than 10μm, which can ensure clear imaging even in night mode; please refer to axial chromatic aberration Fig.38 , axial chromatic aberration is less than ±0.03mm, good color reproduction, no blue-purple edge phenomenon; please refer to the relative illumination curve Fig.37 and 43 , it can be seen that the relative illumination is high. In normal use, the relative illumination is greater than 50%.

[0140] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A high-performance infrared confocal ultra-clear security lens, characterized in that: The lens system includes a first lens to a fifteenth lens in order from the object side to the image side along an optical axis; each of the first lens to the fifteenth lens includes an object-side surface facing the object side and allowing imaging light to pass therethrough, and an image-side surface facing the image side and allowing imaging light to pass therethrough; The first lens has a negative refractive power, the object side surface of the first lens is convex, and the image side surface is concave; the second lens has a positive refractive power, the object side surface of the second lens is convex, and the image side surface is convex; the third lens has a positive refractive power, the object side surface of the third lens is convex, and the image side surface is concave; the first lens to the third lens are a fixed lens group; The fourth lens has a negative refractive power, and the object side surface and the image side surface of the fourth lens are concave; the fifth lens has a negative refractive power, and the object side surface and the image side surface of the fifth lens are concave; the sixth lens has a positive refractive power, and the object side surface and the image side surface of the sixth lens are convex and concave; the fourth lens to the sixth lens form a variable power lens group; The seventh lens has a positive refractive power, and the object side surface and the image side surface of the seventh lens are convex; the eighth lens has a positive refractive power, and the object side surface and the image side surface of the eighth lens are convex; the ninth lens has a negative refractive power, and the object side surface and the image side surface of the ninth lens are concave; the seventh to ninth lenses are a fixed lens group; The tenth lens has a positive refractive power, and the object side surface of the tenth lens is convex, and the image side surface is concave; the eleventh lens has a positive refractive power, and the object side surface of the eleventh lens is convex, and the image side surface is convex; the twelfth lens has a negative refractive power, and the object side surface of the twelfth lens is concave, and the image side surface is concave; the thirteenth lens has a positive refractive power, and the object side surface of the thirteenth lens is convex, and the image side surface is concave; the fourteenth lens has a positive refractive power, and the object side surface of the fourteenth lens is convex, and the image side surface is convex; the fifteenth lens has a negative refractive power, and the object side surface of the fifteenth lens is concave, and the image side surface is convex; the tenth to fifteenth lenses are a compensation lens group; The infrared confocal ultra-clear security lens has only the fifteen lenses with the above-mentioned refractive index; The high-performance infrared confocal ultra-clear security lens also includes an aperture, which is arranged between the sixth lens and the seventh lens.

2. A high-performance infrared confocal ultra-clear security lens as claimed in claim 1, characterized in that: The image side surface of the first lens and the object side surface of the second lens are glued to each other, the image side surface of the fifth lens and the object side surface of the sixth lens are glued to each other, the image side surface of the eighth lens and the object side surface of the ninth lens are glued to each other, and the image side surface of the twelfth lens and the object side surface of the thirteenth lens are glued to each other.

3. A high-performance infrared confocal ultra-clear security lens as claimed in claim 1, characterized in that: The object-side surface and the image-side surface of the eleventh lens are both aspherical surfaces.

4. A high-performance infrared confocal ultra-clear security lens as claimed in claim 1, characterized in that: The following condition is met: |vd1-vd2|>30, wherein vd1 is the dispersion coefficient of the first lens, and vd2 is the dispersion coefficient of the second lens.

5. A high-performance infrared confocal ultra-clear security lens as claimed in claim 1, characterized in that: It meets the following condition: |vd5-vd6|>30, wherein vd5 is the dispersion coefficient of the fifth lens, and vd6 is the dispersion coefficient of the sixth lens.

6. A high-performance infrared confocal ultra-clear security lens as claimed in claim 1, characterized in that: It meets the following condition: |vd8-vd9|>30, wherein vd8 is the dispersion coefficient of the eighth lens, and vd9 is the dispersion coefficient of the ninth lens.

7. A high-performance infrared confocal ultra-clear security lens as claimed in claim 1, characterized in that: It meets the following condition: |vd12-vd13|>30, wherein vd12 is the dispersion coefficient of the twelfth lens, and vd13 is the dispersion coefficient of the thirteenth lens.

8. The high-performance infrared confocal ultra-clear security lens according to claim 1, characterized in that: The following conditions are met: 1.55<fw / BFLw<1.68, 3.91<ft / BFLt<4.03, where fw is the shortest focal length of the lens, BFLw is the back focal length at the shortest focal length, ft is the longest focal length of the lens, and BFLt is the back focal length at the longest focal length.

9. A high-performance infrared confocal ultra-clear security lens as claimed in claim 1, characterized in that: The following condition is met: TTL<64 mm, wherein TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis.

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