A zoom security monitoring lens

Abstract

The present invention discloses a zoom security monitoring lens, which includes a first lens to a twelfth lens; the first lens to the twelfth lens each include an object side and an image side; the first lens has a negative refractive power; the second lens has a negative refractive power; the third lens has a negative refractive power; the fourth lens has a positive refractive power; the first lens to the fourth lens are a fixed lens group; the fifth lens has a positive refractive power; the sixth lens has a positive refractive power; the seventh lens has a negative refractive power; the eighth lens has a positive refractive power; the ninth lens has a positive refractive power; the tenth lens has a negative refractive power; the eleventh lens has a positive refractive power; the twelfth lens has a negative refractive power; the fifth lens to the twelfth lens are a variable magnification lens group; the optical imaging lens has only the twelve lenses with refractive power. The present invention has an ultra-high-definition imaging effect, and the imaging pictures of different focal lengths are clear and uniform; the picture will not have blue-purple fringing chromatic aberration, and has a high image color reproduction; the imaging picture has uniform brightness.

Description

Technical Field

[0001] The present invention relates to the technical field of lenses, and in particular to a zoom security monitoring lens. Background Art

[0002] Security monitoring lens generally refers to the monitoring lens of surveillance camera. Security monitoring lens is widely used because of its high sensitivity, strong light resistance, small distortion, small size, long life, anti-vibration and other advantages. Existing security monitoring lens still has many shortcomings, such as: most of them are fixed focus lenses, which are difficult to meet the use requirements of multiple object distances and different field of view frames at the same time; due to cost and process limitations, the resolution is generally limited to 1080P, which cannot meet the increasing resolution requirements; most of them adopt visible-infrared non-confocal design to correct the chromatic aberration in the ultraviolet spectrum region, and then use unequal thickness switching plates to compensate for the infrared optical path, which leads to the need to consider ICR placement in the design of lens optical structure, increasing the difficulty of lens optical optimization and the complexity of structure; most of them adopt pure glass spherical design, which is limited by the shortcomings and deficiencies of spherical surface in aberration correction, and the lens has a certain degree of high-order aberration, which has a great impact on the clarity and uniformity of imaging. Summary of the invention

[0003] The object of the present invention is to provide a zoom security monitoring lens to at least solve one of the above problems.

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

[0005] A zoom security monitoring lens comprises a first lens to a twelfth lens in sequence from an object side to an image side along an optical axis; each of the first lens to the twelfth 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 negative refractive power, the object side surface of the second lens is convex, and the image side surface is concave; the third lens has a negative refractive power, the object side surface of the third lens is concave, and the image side surface is concave; the fourth lens has a positive refractive power, the object side surface of the fourth lens is convex, and the image side surface is convex; the first lens to the fourth lens are a fixed lens group;

[0007] The fifth lens has a positive refractive power, and the object side surface of the fifth lens is convex and the image side surface is convex; the sixth lens has a positive refractive power, and the object side surface of the sixth lens is convex and the image side surface is convex; the seventh lens has a negative refractive power, and the object side surface of the seventh lens is concave and the image side surface is concave; the eighth lens has a positive refractive power, and the object side surface of the eighth lens is concave and the image side surface is convex; the ninth lens has a positive refractive power, and the object side surface of the ninth lens is convex and the image side surface is convex; the tenth lens has a negative 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 convex; the fifth lens to the twelfth lens are a variable power lens group;

[0008] The optical imaging lens has only the twelve lenses having refractive powers.

[0009] Preferably, the lens meets the following conditions:

[0010] -6<(f1 / fw)<-5, -18<(f2 / fw)<-16, -5<(f3 / fw)<-3.5,

[0011] 4<(f4 / fw)<6, 3<(f6 / fw)<-4.5, -2.5<(f7 / fw)<-1.5,

[0012] 10<(f8 / fw)<12, 3<(f9 / fw)<5, -8<(f10 / fw)<-6,

[0013] 1.5<(f11 / fw)<3,-3<(f12 / fw)<-1.5,

[0014] -2<(f1 / ft)<-1, -5.5<(f2 / ft)<-3, -2<(f3 / ft)<-1,

[0015] 1<(f4 / ft)<2, 1<(f6 / ft)<2, -1.5<(f7 / ft)<-0.2,

[0016] 2<(f8 / ft)<4, 1<(f9 / ft)<2, -3<(f10 / ft)<-1,

[0017] 1.5<(f11 / ft)<0.5,-1.5<(f12 / ft)<-0.5,

[0018] Wherein fw is the focal length of the short focus lens, ft is the focal length of the long focus lens, f1, f2, f3, f4, f6, f7, f8, f9, f10, f11, and f12 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, and the twelfth lens respectively.

[0019] Preferably, the first to fourth lenses and the sixth to twelfth lenses are all glass spherical lenses, and the fifth lens is a glass high-order even-order aspherical lens.

[0020] Preferably, the image side surface of the third lens and the object side surface of the fourth lens are glued to each other, and the image side surface of the eleventh lens and the object side surface of the twelfth lens are glued to each other.

[0021] Preferably, the lens further includes an aperture stop, and the aperture stop is arranged between the fourth lens and the fifth lens.

[0022] Preferably, the refractive indexes of the fourth lens, the seventh lens and the eighth lens are all greater than 1.8, and the Abbe numbers of the fourth lens, the seventh lens and the eighth lens are all less than 26.

[0023] Preferably, the sixth lens and the eleventh lens are both made of a material having a negative refractive index temperature coefficient dn / dt.

[0024] Preferably, the lens meets the following condition: 1.5<(R18+R19) / (R18-R19)<2.5, wherein R18 is the curvature radius of the object side of the tenth lens, and R19 is the curvature radius of the image side of the tenth lens.

[0025] Preferably, the lens meets the following condition: 0.9<|f11 / f12|<1.2, wherein f11 is the focal length of the eleventh lens, and f12 is the focal length of the twelfth lens.

[0026] Preferably, the lens meets the following condition: 1.5<|fF| / (fw*ft)1 / 2<1.8, wherein fF is the focal length of the fixed lens group of the lens, fw is the focal length of the short focus of the lens, and ft is the focal length of the long focus of the lens.

[0027] After adopting the above technical solution, the present invention has the following advantages compared with the background technology:

[0028] 1. The present invention adopts twelve lenses from the object side to the image side, and through the corresponding design of each lens, the maximum resolution of the lens can reach 12 million pixels, and the focal length range covers 4.2mm to 15.0mm. Using a 1 / 1.7" CMOS image sensor, the resolution of the telephoto end and the short focal end reaches 4K (compatible with 12M), with ultra-high-definition imaging effect, and the imaging pictures of different focal lengths are clear and uniform.

[0029] 2. The present invention adopts a 435nm-656nm visible light to 850nm infrared confocal design, performs achromatic design on 435nm and 850nm, and controls the axial chromatic aberration at the same time to ensure that the picture will not have blue-purple fringing chromatic aberration, and has high image color reproduction.

[0030] 3. The light transmission of the present invention is designed to be F / 1.5-F / 2.8, the relative illumination of the edge at the short focal end is greater than 40%, the relative illumination of the edge at the long focal end is greater than 80%, and the brightness of the imaging picture is uniform.

[0031] 4. The present invention introduces a high-order even-order glass aspheric lens, which can better correct various high-order aberrations and greatly improve the imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The optical path diagram of the lens when the first embodiment is at the shortest focal length;

[0033] Figure 2 This is the MTF diagram of Example 1 under visible light when the lens is at the shortest focal length;

[0034] Figure 3 is a defocus curve diagram of Example 1 under visible light when the lens is at the shortest focal length;

[0035] Figure 4 This is the MTF diagram of Example 1 when the lens is at the shortest focal length at infrared 0.850μm;

[0036] Figure 5 This is a defocus curve diagram of Example 1 when the lens is at the shortest focal length at infrared 0.850 μm;

[0037] Figure 6 is an axial chromatic aberration curve diagram of Example 1 when the lens is at the shortest focal length;

[0038] Figure 7 is a relative illumination curve diagram of Example 1 under visible light when the lens is at the shortest focal length;

[0039] Figure 8 is a light path diagram of the lens when the first embodiment is at the longest focal length;

[0040] Fig. 9This is the MTF diagram of the lens of Example 1 under visible light when it is at the longest focal length;

[0041] Fig.10 is a defocus curve diagram of Example 1 under visible light when the lens is at the longest focal length;

[0042] Fig.11 This is the MTF diagram of Example 1 at infrared 0.850μm when the lens is at the longest focal length;

[0043] Fig.12 This is a defocus curve diagram of Example 1 when the lens is at the longest focal length at infrared 0.850 μm;

[0044] Fig.13 is an axial chromatic aberration curve diagram of Example 1 when the lens is at the longest focal length;

[0045] Fig.14 is a relative illumination curve diagram of Example 1 under visible light when the lens is at the longest focal length;

[0046] Fig.15 This is the optical path diagram of the lens when the second embodiment is at the shortest focal length;

[0047] Fig.16 This is the MTF diagram of Example 2 under visible light when the lens is at the shortest focal length;

[0048] Fig.17 is a defocus curve diagram of Example 2 under visible light when the lens is at the shortest focal length;

[0049] Fig.18 This is the MTF diagram of Example 2 when the lens is at the shortest focal length at infrared 0.850μm;

[0050] Fig.19 This is a defocus curve diagram of Example 2 when the lens is at the shortest focal length at infrared 0.850 μm;

[0051] Fig. 20 is an axial chromatic aberration curve diagram of Example 2 when the lens is at the shortest focal length;

[0052] Fig.21 is a relative illumination curve diagram of Example 2 under visible light when the lens is at the shortest focal length;

[0053] Fig. 22 This is a light path diagram of the lens when the second embodiment is at the longest focal length;

[0054] Fig.23 This is the MTF diagram of Example 2 when the lens is at the longest focal length under visible light;

[0055] Fig.24is a defocus curve diagram of Example 2 under visible light when the lens is at the longest focal length;

[0056] Fig.25 This is the MTF diagram of Example 2 at infrared 0.850μm when the lens is at the longest focal length;

[0057] Fig.26 This is a defocus curve diagram of Example 2 when the lens is at the longest focal length at infrared 0.850 μm;

[0058] Fig. 27 is an axial chromatic aberration curve diagram of Example 2 when the lens is at the longest focal length;

[0059] Fig.28 is a relative illumination curve diagram of Example 2 under visible light when the lens is at the longest focal length;

[0060] Fig.29 This is the optical path diagram of the lens when the third embodiment is at the shortest focal length;

[0061] Fig.30 This is the MTF diagram of Example 3 under visible light when the lens is at the shortest focal length;

[0062] Fig.31 is a defocus curve diagram of Example 3 under visible light when the lens is at the shortest focal length;

[0063] Fig.32 This is the MTF diagram of Example 3 at infrared 0.850μm when the lens is at the shortest focal length;

[0064] Fig.33 This is a defocus curve diagram of Example 3 when the lens is at the shortest focal length at infrared 0.850μm;

[0065] Fig.34 is an axial chromatic aberration curve diagram of Example 3 when the lens is at the shortest focal length;

[0066] Fig.35 is a relative illumination curve diagram of Example 3 under visible light when the lens is at the shortest focal length;

[0067] Fig.36 This is a light path diagram of the lens when the third embodiment is at the longest focal length;

[0068] Fig.37 This is the MTF diagram of Example 3 when the lens is at the longest focal length under visible light;

[0069] Fig.38 is a defocus curve diagram of Example 3 under visible light when the lens is at the longest focal length;

[0070] Fig.39This is the MTF diagram of Example 3 at infrared 0.850μm when the lens is at the longest focal length;

[0071] Fig.40 This is a defocus curve diagram of Example 3 when the lens is at the longest focal length at infrared 0.850 μm;

[0072] Fig.41 is an axial chromatic aberration curve diagram of Example 3 when the lens is at the longest focal length;

[0073] Fig.42 is a relative illumination curve diagram of Example 3 under visible light when the lens is at the longest focal length;

[0074] Fig.43 This is a light path diagram of the lens when the fourth embodiment is at the shortest focal length;

[0075] Fig.44 This is the MTF diagram of Example 4 under visible light when the lens is at the shortest focal length;

[0076] Fig.45 is a defocus curve diagram of Example 4 under visible light when the lens is at the shortest focal length;

[0077] Fig.46 This is the MTF diagram of Example 4 at infrared 0.850μm when the lens is at the shortest focal length;

[0078] Fig.47 This is a defocus curve diagram of Example 4 when the lens is at the shortest focal length at infrared 0.850 μm;

[0079] Fig.48 is an axial chromatic aberration curve diagram of Example 4 when the lens is at the shortest focal length;

[0080] Fig.49 is a relative illumination curve diagram of Example 4 under visible light when the lens is at the shortest focal length;

[0081] Fig.50 This is a light path diagram of the lens when the fourth embodiment is at the longest focal length;

[0082] Fig.51 This is the MTF diagram of Example 4 under visible light when the lens is at the longest focal length;

[0083] Fig.52 is a defocus curve diagram of Example 4 under visible light when the lens is at the longest focal length;

[0084] Fig.53 This is the MTF diagram of Example 4 at infrared 0.850μm when the lens is at the longest focal length;

[0085] Fig.54This is a defocus curve diagram of Example 4 when the lens is at the longest focal length at infrared 0.850 μm;

[0086] Fig.55 is an axial chromatic aberration curve diagram of Example 4 when the lens is at the longest focal length;

[0087] Fig.56 This is a relative illumination curve diagram of Example 4 under visible light when the lens is at the longest focal length.

[0088] Description of reference numerals:

[0089] 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 , an aperture 13 , and a protective glass 14 . DETAILED DESCRIPTION

[0090] 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.

[0091] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0092] 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.

[0093] The present invention discloses a zoom security monitoring lens, which includes a first lens to a twelfth lens in sequence along an optical axis from an object side to an image side; each of the first lens to the twelfth lens includes 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;

[0094] 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 negative refractive power, the object side surface of the second lens is convex, and the image side surface is concave; the third lens has a negative refractive power, the object side surface of the third lens is concave, and the image side surface is concave; the fourth lens has a positive refractive power, the object side surface of the fourth lens is convex, and the image side surface is convex; the first lens to the fourth lens are a fixed lens group;

[0095] The front fixed group uses a 4-lens structure, among which the first and second lenses use a double-concave crescent lens structure to converge the light inward at the front end of the lens and compress the front port diameter of the lens. At the same time, in order not to introduce high-order aberrations at the front end, the refractive index of the first and second lens materials is limited to a certain range. The third and fourth lens groups use a negative-positive focal length combination to receive the front light well and perform preliminary chromatic aberration correction. Through the combination of the shape and focal length of the four front lenses, the front fixed group converges the light well, which is conducive to the correction of the light aberration of the rear optical path.

[0096] The fifth lens has a positive refractive power, and the object side surface of the fifth lens is convex and the image side surface is convex; the sixth lens has a positive refractive power, and the object side surface of the sixth lens is convex and the image side surface is convex; the seventh lens has a negative refractive power, and the object side surface of the seventh lens is concave and the image side surface is concave; the eighth lens has a positive refractive power, and the object side surface of the eighth lens is concave and the image side surface is convex; the ninth lens has a positive refractive power, and the object side surface of the ninth lens is convex and the image side surface is convex; the tenth lens has a negative 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 convex; the fifth lens to the twelfth lens are a variable power lens group;

[0097] The rear-end zoom group uses eight lenses that move as a whole to change the magnification. A glass aspheric lens is placed after the aperture, which can effectively correct the distortion and high-order aberrations introduced by the front-end fixed group. At the same time, when the aspheric lens is placed at the front end of the zoom group, since it plays the role of receiving the large-aperture light beam at the front end, the surface of the aspheric lens is not prone to reverse curvature, inflection points and other difficult-to-process conditions. Placing the aspheric lens after the aperture (where the light converges) can effectively reduce the optical aperture of the aspheric surface, thereby reducing the lens processing cost and assembly process cost.

[0098] The optical imaging lens has only the twelve lenses having refractive powers.

[0099] Preferably, the lens meets the following conditions:

[0100] -6<(f1 / fw)<-5, -18<(f2 / fw)<-16, -5<(f3 / fw)<-3.5,

[0101] 4<(f4 / fw)<6, 3<(f6 / fw)<-4.5, -2.5<(f7 / fw)<-1.5,

[0102] 10<(f8 / fw)<12, 3<(f9 / fw)<5, -8<(f10 / fw)<-6,

[0103] 1.5<(f11 / fw)<3,-3<(f12 / fw)<-1.5,

[0104] -2<(f1 / ft)<-1, -5.5<(f2 / ft)<-3, -2<(f3 / ft)<-1,

[0105] 1<(f4 / ft)<2, 1<(f6 / ft)<2, -1.5<(f7 / ft)<-0.2,

[0106] 2<(f8 / ft)<4, 1<(f9 / ft)<2, -3<(f10 / ft)<-1,

[0107] 1.5<(f11 / ft)<0.5,-1.5<(f12 / ft)<-0.5,

[0108] Wherein fw is the focal length of the short focus lens, ft is the focal length of the long focus lens, f1, f2, f3, f4, f6, f7, f8, f9, f10, f11, and f12 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, and the twelfth lens respectively.

[0109] Preferably, the first to fourth lenses and the sixth to twelfth lenses are all glass spherical lenses, and the fifth lens is a glass high-order even-order aspherical lens. The fifth lens can correct off-axis aberrations, optimize high-order aberrations, etc., and greatly improve image quality. At the same time, thanks to the mature fine processing technology of glass aspherical lenses, the mass production cost of lenses can be reduced, the overall optical assembly yield of lenses can be improved, and the product practicality and competitiveness of lenses can be increased.

[0110] The equations for the object side and image side curves of an aspheric lens are expressed as follows:

[0111]

[0112] in:

[0113] 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);

[0114] c: the vertex curvature of the aspherical surface;

[0115] K: Conic Constant;

[0116] radial distance;

[0117] r n : Normalization radius (NRADIUS);

[0118] u:r / r n ;

[0119] a m : mth order Q con Coefficient (is the m th Q con coefficient);

[0120] Q m con : mth order Q con Polynomial th Q con polynomial).

[0121] Preferably, the image side surface of the third lens and the object side surface of the fourth lens are glued to each other, and the image side surface of the eleventh lens and the object side surface of the twelfth lens are glued to each other.

[0122] Preferably, the lens further includes an aperture stop, and the aperture stop is arranged between the fourth lens and the fifth lens.

[0123] Preferably, the refractive indexes of the fourth lens, the seventh lens and the eighth lens are all greater than 1.8, and the Abbe numbers of the fourth lens, the seventh lens and the eighth lens are all less than 26, which can converge light inwards well and improve image quality.

[0124] Preferably, the sixth lens and the eleventh lens are both made of materials with a negative refractive index temperature coefficient dn / dt to correct the influence of temperature change on lens imaging, so that the lens can keep the image clear and not out of focus when used in a temperature range of -40°C-85°C.

[0125] Preferably, the lens meets the following condition: 1.5<(R18+R19) / (R18-R19)<2.5, which can effectively balance the field curvature at the rear end of the lens, wherein R18 is the curvature radius of the object side of the tenth lens, and R19 is the curvature radius of the image side of the tenth lens.

[0126] Preferably, the lens meets the following condition: 0.9<|f11 / f12|<1.2, wherein f11 is the focal length of the eleventh lens, and f12 is the focal length of the twelfth lens. More design variables can be provided at the end of the lens group to balance the distortion, field curvature and other high-order aberrations of the system.

[0127] Preferably, the lens meets the following condition: 1.5<|fF| / (fw*ft)1 / 2<1.8, wherein fF is the focal length of the fixed lens group of the lens, fw is the focal length of the short focus of the lens, and ft is the focal length of the long focus of the lens.

[0128] The security monitoring lens of the present invention will be described in detail below with reference to specific embodiments.

[0129] Embodiment 1

[0130] refer to Figure 1 As shown, this embodiment discloses a zoom security monitoring lens, which includes a first lens 1 to a twelfth lens 12 in sequence along an optical axis from an object side A1 to an image side A2; each of the first lens 1 to the twelfth lens 12 includes 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;

[0131] 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 negative refractive power, and the object side surface of the second lens 2 is convex, and the image side surface is concave; the third lens 3 has a negative refractive power, and the object side surface of the third lens 3 is concave, and the image side surface is concave; the fourth lens 4 has a positive refractive power, and the object side surface of the fourth lens 4 is convex, and the image side surface is convex; the first lens 1 to the fourth lens 4 are a fixed lens group;

[0132] The fifth lens 5 has a positive refractive power, and the object side surface of the fifth lens 5 is convex and the image side surface is convex; the sixth lens 6 has a positive refractive power, and the object side surface of the sixth lens 6 is convex and the image side surface is convex; the seventh lens 7 has a negative refractive power, and the object side surface of the seventh lens 7 is concave and the image side surface is concave; the eighth lens 8 has a positive refractive power, and the object side surface of the eighth lens 8 is concave and the image side surface is convex; the ninth lens 9 has a positive refractive power, and the object side surface of the ninth lens 9 is convex and the image side surface is convex; the tenth lens 10 has a negative 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 convex; the fifth lens 5 to the twelfth lens 12 are a variable power lens group;

[0133] The optical imaging lens has only the twelve lenses having refractive powers.

[0134] In this embodiment, the image side surface of the third lens 3 and the object side surface of the fourth lens 4 are glued to each other, the image side surface of the eleventh lens 11 and the object side surface of the twelfth lens 12 are glued to each other, and the fifth lens 5 is a glass high-order even-order aspheric lens. The aperture 13 is arranged between the fourth lens 4 and the fifth lens 5.

[0135] The detailed optical data of this specific embodiment at the shortest focal length (short focus) are shown in Table 1-1.

[0136] Table 1-1 Detailed optical data of Example 1 at the shortest focal length

[0137]

[0138]

[0139] The detailed optical data of this specific embodiment at the longest focal length (telephoto) are shown in Table 1-2.

[0140] Table 1-2 Detailed optical data of Example 1 at the longest focal length

[0141] surface Size (diameter) Radius of curvature thickness Material Refractive Index Dispersion coefficient focal length 0 Infinity Infinity 1 First lens 36.82 44.56 1.77 H-LAF62 1.720000 43.6834 -23.59 2 23.21 12.13 7.26 3 Second lens 24.00 37.62 2.01 H-ZPK2A 1.603001 65.4596 -70.72 4 20.36 19.61 7.04 5 The third lens 18.98 -26.63 1.00 H-ZBAF3 1.656914 51.1566 -19.02 6 The fourth lens 18.91 24.05 3.11 H-ZLAF90 2.000689 25.4351 22.63 7 18.75 -415.51 1.26 8 Aperture surface 10.95 Infinity 0.63 9 Fifth lens 13.87 14.96 3.59 H-LAF50B 1.772501 49.6135 15.20 10 13.36 -49.78 0.10 11 The sixth lens 13.00 70.00 4.20 H-FK61 1.496998 81.5947 16.86 12 Seventh lens 13.40 -9.35 0.84 H-ZF52A 1.846670 23.7912 -9.05 13 11.83 46.03 2.03 14 The eighth lens 11.50 -33.00 1.85 H-ZF88 1.945958 17.9439 50.51 15 12.59 -20.13 0.12 16 The ninth lens 12.66 204.98 2.50 H-ZF88 1.945958 17.9439 18.19 17 12.65 -18.87 0.11 18 Tenth lens 11.52 39.57 1.12 H-ZF6 1.755205 27.547441 -29.971717 19 9.50 14.28 0.27 20 Eleventh lens 10.63 13.26 3.78 H-FK71 1.4565 90.269745 12.511954 21 Twelfth lens 10.63 -9.17 1.20 H-ZF52A 1.84667 23.791236 -11.488281 22 10.14 -150.48 16.36 23 Protective glass 8.48 Infinity 0.50 H-K9L 1.516797 64.212351 Infinity 24 8.47 Infinity 3.97 25 Imaging surface 8.38 Infinity

[0142] Please refer to the following table for detailed parameter data of the aspheric surface of the fifth lens 5:

[0143] Surface number K A4 A6 A8 A10 A12 A14 9 -0.88 4.183E-05 -1.379E-08 1.507E-08 -3.310E-10 3.936E-12 3.928E-15 10 -7.58 4.860E-05 -2.850E-07 5.450E-09 -1.735E-10 2.856E-12 -6.404E-15

[0144] In this specific embodiment, the focal length of the zoom lens at short focus is fw=4.227mm, and the focal length at short focus is ft=14.899; the maximum resolution can reach 12 million pixels, the DFOV is between 32° and 130°, and the light transmission is F / 1.5-F / 2.8.

[0145] For the resolution of visible light and infrared in this embodiment, please refer to Figure 2 , Figure 4 , Fig. 9 and Fig.11 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 100lp / 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 5 , Fig.10 and Fig.12 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 6 and Fig.13 It can be seen that the color reproduction is good, there is no blue-purple edge phenomenon, and the image color reproduction is high; please refer to the relative illumination curve Figure 7 and 14 It can be seen that the relative illumination is high. In normal use, the relative illumination at the edge of the short focal end is greater than 40%, and the relative illumination at the edge of the long focal end is greater than 80%.

[0146] Embodiment 2

[0147] Cooperate Figures 15 to 28 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 lens thickness are different.

[0148] The detailed optical data of this specific embodiment at the shortest focal length (short focus) are shown in Table 2-1.

[0149] Table 2-1 Detailed optical data of Example 2 at the shortest focal length

[0150] surface Size (diameter) Radius of curvature thickness Material Refractive Index Dispersion coefficient focal length 0 Infinity Infinity 1 First lens 36.43 45.69 1.77 H-LAF62 1.719999 43.6912 -24.12 2 23.50 12.42 7.08 3 Second lens 24.00 34.41 2.01 H-ZPK2A 1.603001 65.4596 -73.79 4 20.50 19.00 7.22 5 The third lens 19.17 -26.55 1.00 H-ZBAF3 1.656914 51.1566 -18.96 6 The fourth lens 19.18 23.98 2.76 H-ZLAF90 2.000689 25.4351 22.35 7 19.09 -349.50 26.15 8 Aperture surface 10.27 Infinity 13.13 9 Fifth lens 14.00 15.05 3.53 H-LAF50B 1.772501 49.6135 15.25 10 14.00 -49.52 0.10 11 The sixth lens 13.00 71.38 3.96 H-FK61 1.496998 81.5947 16.94 12 Seventh lens 13.40 -9.39 0.79 H-ZF52A 1.846670 23.7912 -9.04 13 11.25 44.82 2.08 14 The eighth lens 11.50 -30.62 1.87 H-ZF88 1.945958 17.9439 50.20 15 12.06 -19.25 0.12 16 The ninth lens 12.13 211.43 2.45 H-ZF88 1.945958 17.9439 18.22 17 12.20 -18.87 0.11 18 Tenth lens 11.27 35.49 1.12 H-ZF6 1.755205 27.547441 -29.945191 19 9.50 13.68 0.14 20 Eleventh lens 10.44 13.49 3.77 H-FK71 1.4565 90.269745 12.643953 21 Twelfth lens 10.44 -9.23 1.18 H-ZF52A 1.84667 23.791236 -11.529644 22 9.87 -160.11 4.34 23 Protective glass 8.88 Infinity 0.50 H-K9L 1.516797 64.212351 Infinity 24 8.87 Infinity 3.98 25 Imaging surface 8.78 Infinity

[0151] The detailed optical data of this specific embodiment at the longest focal length (telephoto) are shown in Table 2-2.

[0152] Table 2-2 Detailed optical data of Example 2 at the longest focal length

[0153]

[0154]

[0155] Please refer to the following table for detailed parameter data of the aspheric surface of the fifth lens 5:

[0156] Surface number K A4 A6 A8 A10 A12 A14 9 -0.91 4.105E-05 -1.747E-08 1.563E-08 -3.269E-10 3.867E-12 2.299E-15 10 -6.68 4.798E-05 -2.626E-07 5.419E-09 -1.755E-10 2.815E-12 -9.037E-15

[0157] In this specific embodiment, the focal length of the zoom lens at short focus is fw=4.262mm, and the focal length at short focus is ft=14.950; the maximum resolution can reach 12 million pixels, the DFOV is between 32° and 130°, and the light transmission is F / 1.5-F / 2.8.

[0158] For the resolution of visible light and infrared in this embodiment, please refer to Fig.16 , Fig.18 , Fig.23 and Fig.25 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 100lp / 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.17 , Fig.19 , Fig.24 and Fig.26 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. 20 and Fig. 27 It can be seen that the color reproduction is good, there is no blue-purple edge phenomenon, and the image color reproduction is high; please refer to the relative illumination curve Fig.21 and 28 It can be seen that the relative illumination is high. In normal use, the relative illumination at the edge of the short focal end is greater than 40%, and the relative illumination at the edge of the long focal end is greater than 80%.

[0159] Embodiment 3

[0160] Cooperate Figure 29 to Figure 42 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 lens thickness are different.

[0161] The detailed optical data of this specific embodiment at the shortest focal length (short focus) are shown in Table 3-1.

[0162] Table 3-1 Detailed optical data of Example 3 at the shortest focal length

[0163]

[0164]

[0165] The detailed optical data of this specific embodiment at the longest focal length (telephoto) are shown in Table 3-2.

[0166] Table 3-2 Detailed optical data of Example 3 at the longest focal length

[0167]

[0168]

[0169] Please refer to the following table for detailed parameter data of the aspherical surface of the fifth lens 5:

[0170] Surface number K A4 A6 A8 A10 A12 A14 9 -0.96 4.190E-05 2.730E-07 2.043E-08 -4.970E-10 2.024E-12 1.292E-13 10 -3.92 3.994E-05 6.071E-08 6.861E-09 -3.269E-10 2.237E-12 1.208E-13

[0171] In this specific embodiment, the focal length of the zoom lens at short focus is fw=4.269mm, and the focal length at short focus is ft=14.806; the maximum resolution can reach 12 million pixels, the DFOV is between 32° and 130°, and the light transmission is F / 1.5-F / 2.8.

[0172] For the resolution of visible light and infrared in this embodiment, please refer to Fig.30 , Fig.32 , Fig.37 and Fig.39 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 100lp / 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.31 , Fig.33 , Fig.38 and Fig.40 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.34 and Fig.41 It can be seen that the color reproduction is good, there is no blue-purple edge phenomenon, and the image color reproduction is high; please refer to the relative illumination curve Fig.35 and 42 It can be seen that the relative illumination is high. In normal use, the relative illumination at the edge of the short focal end is greater than 40%, and the relative illumination at the edge of the long focal end is greater than 80%.

[0173] Embodiment 4

[0174] Cooperate Figures 43 to 56 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 lens thickness are different.

[0175] The detailed optical data of this specific embodiment at the shortest focal length (short focus) are shown in Table 4-1.

[0176] Table 4-1 Detailed optical data of Example 4 at the shortest focal length

[0177]

[0178]

[0179] The detailed optical data of this specific embodiment at the longest focal length (telephoto) are shown in Table 4-2.

[0180] Table 4-2 Detailed optical data of Example 4 at the longest focal length

[0181] surface Size (diameter) Radius of curvature thickness Material Refractive Index Dispersion coefficient focal length 0 Infinity Infinity 1 First lens 36.82 57.07 1.77 H-LAF62 1.719999 43.6912 -21.86 2 23.21 12.21 6.00 3 Second lens 24.00 34.81 2.01 H-ZPK2A 1.603001 65.4596 -73.95 4 20.36 19.15 6.69 5 The third lens 18.98 -26.94 1.00 H-ZBAF3 1.656914 51.1566 -19.14 6 The fourth lens 18.91 24.09 3.28 H-ZLAF90 2.000689 25.4351 21.92 7 18.75 -246.77 1.48 8 Aperture surface 10.31 Infinity 0.95 9 Fifth lens 13.87 15.31 3.57 H-LAF50B 1.772501 49.6135 15.29 10 13.36 -47.23 0.10 11 The sixth lens 13.00 57.34 4.43 H-FK61 1.496998 81.5947 16.15 12 Seventh lens 13.40 -9.12 0.77 H-ZF52A 1.846670 23.7912 -8.77 13 11.83 43.24 2.78 14 The eighth lens 11.50 -36.53 1.79 H-ZF88 1.945958 17.9439 50.22 15 12.59 -21.24 0.12 16 The ninth lens 12.66 197.99 2.51 H-ZF88 1.945958 17.9439 18.03 17 12.65 -18.75 0.11 18 Tenth lens 11.52 54.41 1.02 H-ZF6 1.755205 27.547441 -33.662119 19 9.50 17.26 0.70 20 Eleventh lens 10.63 13.75 3.31 H-FK71 1.4565 90.269745 12.801906 21 Twelfth lens 10.63 -9.43 0.95 H-ZF52A 1.84667 23.791236 -11.134653 22 10.14 -1370.36 16.57 23 Protective glass 8.88 Infinity 0.50 H-K9L 1.516797 64.212351 Infinity 24 8.89 Infinity 3.74 25 Imaging surface 8.95 Infinity

[0182] Please refer to the following table for detailed parameter data of the aspheric surface of the fifth lens 5:

[0183] Surface number K A4 A6 A8 A10 A12 A14 9 -0.88 4.081E-05 1.554E-07 1.898E-08 -4.595E-10 2.291E-12 7.258E-14 10 -4.71 4.034E-05 -1.096E-07 1.006E-08 -3.231E-10 7.814E-14 1.002E-13

[0184] In this specific embodiment, the focal length of the zoom lens at short focus is fw=4.297mm, and the focal length at short focus is ft=14.887; the maximum resolution can reach 12 million pixels, the DFOV is between 32° and 130°, and the light transmission is F / 1.5-F / 2.8.

[0185] For the resolution of visible light and infrared in this embodiment, please refer to Fig.44 , Fig.46 , Fig.51 and Fig.53 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 100lp / 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.45 , Fig.47 , Fig.52 and Fig.54 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.48 and Fig.55 It can be seen that the color reproduction is good, there is no blue-purple edge phenomenon, and the image color reproduction is high; please refer to the relative illumination curve Fig.49 and 56 It can be seen that the relative illumination is high. In normal use, the relative illumination at the edge of the short focal end is greater than 40%, and the relative illumination at the edge of the long focal end is greater than 80%.

[0186] 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 zoom security monitoring lens, characterized in that: The lens system includes a first lens to a twelfth lens in sequence from the object side to the image side along an optical axis; each of the first lens to the twelfth 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 negative refractive power, the object side surface of the second lens is convex, and the image side surface is concave; the third lens has a negative refractive power, the object side surface of the third lens is concave, and the image side surface is concave; the fourth lens has a positive refractive power, the object side surface of the fourth lens is convex, and the image side surface is convex; the first lens to the fourth lens are a fixed lens group; The fifth lens has a positive refractive power, and the object side surface of the fifth lens is convex and the image side surface is convex; the sixth lens has a positive refractive power, and the object side surface of the sixth lens is convex and the image side surface is convex; the seventh lens has a negative refractive power, and the object side surface of the seventh lens is concave and the image side surface is concave; the eighth lens has a positive refractive power, and the object side surface of the eighth lens is concave and the image side surface is convex; the ninth lens has a positive refractive power, and the object side surface of the ninth lens is convex and the image side surface is convex; the tenth lens has a negative 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 convex; the fifth lens to the twelfth lens are a variable power lens group; The optical imaging lens has only the twelve lenses with refractive powers; Among them, -6<(f1 / fw)<-5, -18<(f2 / fw)<-16, -5<(f3 / fw)<-3.5, 4<(f4 / fw)<6, 3<(f6 / fw)<-4.5, -2.5<(f7 / fw)<-1.5, 10<(f8 / fw)<12, 3<(f9 / fw)<5, -8<(f10 / fw)<-6, 1.5<(f11 / fw)<3,-3<(f12 / fw)<-1.5, -2<(f1 / ft)<-1, -5.5<(f2 / ft)<-3, -2<(f3 / ft)<-1, 1<(f4 / ft)<2, 1<(f6 / ft)<2, -1.5<(f7 / ft)<-0.2, 2<(f8 / ft)<4, 1<(f9 / ft)<2, -3<(f10 / ft)<-1, 1.5<(f11 / ft)<0.5,-1.5<(f12 / ft)<-0.5, Wherein fw is the focal length of the short focus lens, ft is the focal length of the long focus lens, f1, f2, f3, f4, f6, f7, f8, f9, f10, f11, and f12 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, and the twelfth lens respectively.

2. A zoom security monitoring lens as claimed in claim 1, characterized in that: The first to fourth lenses and the sixth to twelfth lenses are all glass spherical lenses, and the fifth lens is a glass high-order even-order aspherical lens.

3. The zoom security monitoring lens according to claim 1, characterized in that: The image side surface of the third lens and the object side surface of the fourth lens are glued to each other, and the image side surface of the eleventh lens and the object side surface of the twelfth lens are glued to each other.

4. A zoom security monitoring lens as claimed in claim 3, characterized in that: The optical system further includes a stop, which is disposed between the fourth lens and the fifth lens.

5. The zoom security monitoring lens according to claim 1, characterized in that: The refractive indexes of the fourth lens, the seventh lens and the eighth lens are all greater than 1.8, and the Abbe numbers of the fourth lens, the seventh lens and the eighth lens are all less than 26.

6. The zoom security monitoring lens according to claim 1, characterized in that: The sixth lens and the eleventh lens are both made of a material whose refractive index temperature coefficient dn / dt is a negative value.

7. The zoom security monitoring lens according to claim 1, characterized in that: The following condition is met: 1.5<(R18+R19) / (R18-R19)<2.5, wherein R18 is the radius of curvature of the object side surface of the tenth lens, and R19 is the radius of curvature of the image side surface of the tenth lens.

8. The zoom security monitoring lens according to claim 1, characterized in that: The following condition is met: 0.9<|f11 / f12|<1.2, wherein f11 is the focal length of the eleventh lens, and f12 is the focal length of the twelfth lens.

9. The zoom security monitoring lens according to claim 1, characterized in that: It meets the following condition: 1.5<|fF| / (fw*ft)1 / 2<1.8, where fF is the focal length of the fixed lens group of the lens, fw is the focal length of the short focus of the lens, and ft is the focal length of the long focus of the lens.

Images