Wide-angle large-aperture glass-plastic hybrid lens

Abstract

The utility model discloses a wide-angle large-aperture glass-plastic hybrid lens. The wide-angle large-aperture glass-plastic hybrid lens is sequentially arranged from an object side to an image side along an optical axis of the lens. A first lens is a spherical glass first lens with negative focal power; the second lens is an aspheric plastic second lens with positive focal power or negative focal power; the third lens is a spherical glass third lens with positive focal power; the fourth lens is an aspheric plastic fourth lens with positive focal power; the fifth lens is an aspheric plastic fifth lens with negative focal power; and the sixth lens is an aspheric plastic sixth lens with positive focal power. The lens is formed by mixing and combining two pieces of spherical glass and four pieces of aspheric plastic and can be matched with a 4K and 1 / 2.7 inch chip, 24-hour all-weather high-definition monitoring is achieved, real-shot pictures are clear at the high temperature of 80 DEG C and the low temperature of-40 DEG C, and day and night confocal performance is good.

Description

Technical Field

[0001] The utility model relates to the technical field of optical lenses, in particular to a wide-angle large-aperture glass-plastic hybrid lens. Background Art

[0002] In recent years, with the increasing progress of digital imaging technology, lenses have been widely used in the field of case monitoring. With the growing demand for surveillance lenses, the requirements for the imaging quality and production yield of surveillance lenses are getting higher and higher. Currently, for wide-angle security surveillance lenses, they are relatively large in size, have low imaging quality, and the image plane and field of view angle are not large enough. Therefore, it is necessary to design a security surveillance lens that can meet the above requirements simultaneously. Content of the Utility Model

[0003] Based on this, the utility model provides a wide-angle large-aperture glass-plastic hybrid lens with a field of view angle FOV > 140°, which can be paired with a 4K, 1 / 2.7-inch chip to achieve 24-hour all-weather high-definition monitoring. The real-time shooting images are clear at a high temperature of 80°C and a low temperature of -40°C, and the day-night co-focusing performance is good.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] A wide-angle large-aperture glass-plastic hybrid lens is sequentially arranged from the object side to the image side along the optical axis of the lens:

[0006] A first lens, the first lens is a spherical glass lens with a negative optical power, the object side surface of the first lens is a convex surface, and the image side surface is a concave surface;

[0007] A second lens, the second lens is an aspherical plastic lens with a positive or negative optical power, the object side surface of the second lens is a concave surface, and the image side surface is a convex surface;

[0008] A third lens, the third lens is a spherical glass lens with a positive optical power, the object side surface of the third lens is a convex surface, and the image side surface is a convex surface;

[0009] An aperture stop;

[0010] A fourth lens, the fourth lens is an aspherical plastic lens with a positive optical power, the object side surface of the fourth lens is a convex surface, and the image side surface is a convex surface;

[0011] A fifth lens, the fifth lens is an aspherical plastic lens with a negative optical power, the object side surface of the fifth lens is a concave surface, and the image side surface is a concave surface;

[0012] A sixth lens, the sixth lens is an aspherical plastic lens with a positive optical power, the object side surface of the sixth lens is a convex surface, and the image side surface is a convex surface;

[0013] A filter, the filter is disposed on the image side of the sixth lens, and the filter is made of D263T glass;

[0014] A protective glass and an image acquisition element, the protective glass is integrated on the image acquisition element, and the image acquisition element is disposed on the image side of the filter.

[0015] Further, the lens satisfies the following relationship:

[0016] -1.78 ≤ f1 / f ≤ -1.55,

[0017] -870.85 ≤ f2 / f ≤ +63.83,

[0018] +2.11 ≤ f3 / f ≤ +2.45,

[0019] +2.23 ≤ f4 / f ≤ +2.76,

[0020] -1.51 ≤ f5 / f ≤ -1.23,

[0021] +1.98 ≤ f6 / f ≤ +2.55; In the relationship, f is the total focal length of the lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.

[0022] Further, the lens also satisfies the following relationship:

[0023] IC / TTL ≥ 0.14,

[0024] 6.95 ≤ TTL / f ≤ 7.33,

[0025] 0.19 ≤ OBFL / TTL ≤ 0.24; In the relationship, f is the total focal length of the lens, TTL is the total optical length of the lens, OBFL is the optical back focal length of the lens, and IC is the full image height of the 1 / 2.7-inch chip matched by the lens system.

[0026] Further, the lens also satisfies the following conditions:

[0027] F# ≤ 1.60,

[0028] 2.85mm ≤ f ≤ 3.55mm,

[0029] TTL ≤ 22.5mm; In the relationship, F# is the aperture of the lens, f is the total focal length of the lens, and TTL is the total optical length of the lens.

[0030] Further, the focal lengths, refractive indices, and curvature radii of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens respectively satisfy the following conditions:

[0031] f1 -5.76～-4.92 ND1 1.55～1.65 R11 +33.42～+105.77 R12 +2.67～+3.22 f2 -2745.71～-203.67 ND2 1.60～1.66 R21 -7.55～-6.31 R22 -8.94～-7.56 f3 +7.03～+7.47 ND3 1.49～1.60 R31 +11.89～+18.38 R32 -5.88～-5.23 f4 +7.63～+8.87 ND4 1.50～1.55 R41 +18.12～+33.56 R42 -5.22～-4.79 f5 -4.78～-4.11 ND5 1.60～1.66 R51 -15.32～-11.43 R52 +3.25～+3.94 f6 +6.13～+7.99 ND6 1.50～1.55 R61 +6.16～+7.78 R62 -7.87～-6.06

[0032] Among them, f1 is the focal length of the first lens, ND1 is the refractive index of the first lens, R11 is the curvature radius of the object side surface of the first lens, and R12 is the curvature radius of the image side surface of the first lens;

[0033] f2 is the focal length of the second lens, ND2 is the refractive index of the second lens, R21 is the curvature radius of the object side surface of the second lens, and R22 is the curvature radius of the image side surface of the second lens;

[0034] f3 is the focal length of the third lens, ND3 is the refractive index of the third lens, R31 is the curvature radius of the object side surface of the third lens, and R32 is the curvature radius of the image side surface of the third lens;

[0035] f4 is the focal length of the fourth lens, ND4 is the refractive index of the fourth lens, R41 is the curvature radius of the object side surface of the fourth lens, and R42 is the curvature radius of the image side surface of the fourth lens;

[0036] f5 is the focal length of the fifth lens, ND5 is the refractive index of the fifth lens, R51 is the curvature radius of the object side surface of the fifth lens, and R52 is the curvature radius of the image side surface of the fifth lens;

[0037] f6 is the focal length of the sixth lens, ND6 is the refractive index of the sixth lens, and R61 is the curvature radius of the object side surface of the sixth lens;

[0038] Focal length: The "+" sign indicates that the lens has a positive optical power, and the "-" sign indicates that the lens has a negative optical power. The unit of the focal length is mm;

[0039] Curvature radius: The "+" sign indicates that the surface bends towards the image side, and the "-" sign indicates that the surface bends towards the object side. The unit is mm.

[0040] Further, the aspherical surfaces of the second lens, fourth lens, fifth lens, and sixth lens satisfy the following formula:

[0041]

[0042] In the formula, Z is the sag height of the lens along the optical axis direction, k is the conic coefficient of the quadric surface, γ is the lens height, c is the lens curvature, and A, B, C, D, E, F, G are the coefficients of the 4th, 6th, 8th, 10th, 12th, 14th, and 16th order terms of the aspherical polynomial.

[0043] The beneficial effects of the present utility model are:

[0044] Through reasonable selection of lens materials, optimization of optical power distribution and optical design, the field of view angle FOV of the present utility model is >140°. It can be paired with a 4K, 1 / 2.7-inch chip to achieve 24-hour all-weather high-definition monitoring. The imaging in day and night is confocal, and the real-time captured images are clear at a high temperature of 80°C and a low temperature of -40°C.

[0045] The present utility model adopts a hybrid combination of 2 spherical glasses and 4 aspherical plastics. The system aberration is well corrected, and the optical performance is good. In terms of manufacturability, each lens is insensitive, the lens surface type is simple and easy to manufacture, and its processing cost is relatively low compared to those on the market. It has a high cost performance and can achieve the characteristics of small volume, light weight, good performance and low cost. Description of the Drawings

[0046] Figure 1 It is a schematic diagram of the optical structure of an embodiment of the present utility model;

[0047] Figure 2 It is a schematic diagram of the optical path structure of an embodiment of the present utility model;

[0048] Figure 3 It is the field curvature diagram of visible light 0.546μm of an embodiment of the present utility model;

[0049] Figure 4 It is the distortion diagram of visible light 0.546μm of an embodiment of the present utility model;

[0050] Figure 5 It is the ray fan diagram of an embodiment of the present utility model;

[0051] Figure 6 It is the defocus curve diagram of visible light 0.435 - 0.656μm (125lp / mm) at room temperature of 20°C of Embodiment 1 of the present utility model;

[0052] Figure 7 It is the defocus curve diagram of visible light 0.435 - 0.656μm (125lp / mm) at low temperature of -40°C of Embodiment 1 of the present utility model;

[0053] Figure 8 It is the defocus curve diagram of visible light 0.435 - 0.656μm (125lp / mm) at high temperature of 80°C of Embodiment 1 of the present utility model;

[0054] Figure 9 It is the defocus curve diagram of infrared light 0.850μm (125lp / mm) of Embodiment 1 of the present utility model;

[0055] Reference Numerals: 1, first lens; 2, second lens; 3, third lens; 4, fourth lens; 5, fifth lens; 6, sixth lens; 7, filter; 8, protective glass; 9, image acquisition element; 10, aperture stop. Detailed Embodiment

[0056] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. In this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. The spherical or aspherical shape is not limited to the spherical or aspherical shape shown in the drawings. The drawings are only for illustration and are not drawn strictly to scale.

[0057] In the present invention, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region; if the lens surface is not defined as convex, concave or flat, it means that the lens surface can be convex, concave or flat. The surface of each lens closest to the object to be photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0058] Unless otherwise defined, all terms (including technical terms and scientific terms) used in the present invention have the same meaning as the ordinary understanding of those of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and will not be interpreted in an idealized or overly formal sense unless clearly defined as such in the present invention.

[0059] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. For better understanding and implementation, the present invention will be described in detail below with reference to the accompanying drawings.

[0060] The present utility model provides a wide-angle large-aperture glass-plastic hybrid lens. The surface of the lens adjacent to the object side is the object side surface, and the surface of the lens adjacent to the image side is the image side surface. Along the optical axis of the lens, from the object side to the image side, the following are arranged in sequence: a first lens 1, a second lens 2, a third lens 3, an aperture stop 10, a fourth lens 4, a fifth lens 5, a sixth lens 6, a filter 7, a protective glass 8, and an image acquisition element 9. Among them, the aperture stop 10 is arranged between the third lens 3 and the fourth lens 4; the filter 7 is arranged on the image side surface of the sixth lens 6, and the filter 7 is made of D263T glass. The protective glass 8 is integrated on the image acquisition element 9, and the image acquisition element 9 is arranged on the image side surface of the filter 7.

[0061] In the present utility model, in order to enable the optical system to exhibit better performance, during the design process, we need to reasonably select the lens materials, reasonably allocate the focal lengths of each lens, and reasonably optimize the optical system, so as to finally optimize the performance of the optical system. Usually, the existence of optical system aberrations will affect the imaging quality of the optical system. Correcting aberrations is the key to optimizing the optical system. There are many methods for correcting aberrations. For example, using lenses with different refractive indices and significantly different Abbe numbers in combination can eliminate chromatic aberration and spherical aberration to a certain extent. Reasonably allocating and optimizing the focal lengths and shapes of each lens can also correct the aberrations of the system.

[0062] In the present utility model, f is the total focal length of the 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, f4 is the focal length of the fourth lens 4, f5 is the focal length of the fifth lens 5, and f6 is the focal length of the sixth lens 6. The total focal length of the entire lens is f, and the ratio of the focal length of each lens to the total focal length of the lens satisfies the following conditions:

[0063] -1.78 ≤ f1 / f ≤ -1.55,

[0064] -870.85 ≤ f2 / f ≤ +63.83,

[0065] +2.11 ≤ f3 / f ≤ +2.45,

[0066] +2.23 ≤ f4 / f ≤ +2.76,

[0067] -1.51 ≤ f5 / f ≤ -1.23,

[0068] +1.98 ≤ f6 / f ≤ +2.55.

[0069] In the present utility model, F# is the aperture of the lens, f is the total focal length of the lens; TTL is the total optical length of the lens; OBFL is the optical back focal length of the lens, and the optical back focal length of the lens is the distance from the point on the image side of the sixth lens 6 closest to the image plane to the image plane; IC is the full image height of the 1 / 2.7-inch chip matched with the lens system; they satisfy the following conditions:

[0070] F# ≤ 1.60,

[0071] 2.85 mm ≤ f ≤ 3.55 mm,

[0072] TTL ≤ 22.5 mm,

[0073] IC / TTL ≥ 0.14,

[0074] 6.95 ≤ TTL / f ≤ 7.33,

[0075] 0.19 ≤ OBFL / TTL ≤ 0.24.

[0076] In the present utility model, considering the aberration of the optical system and the problem of balancing temperature drift, the focal lengths, refractive indices and curvature radii of each lens respectively satisfy the following conditions:

[0077] f1 -5.76～-4.92 ND1 1.55～1.65 R11 +33.42～+105.77 R12 +2.67～+3.22 f2 -2745.71～-203.67 ND2 1.60～1.66 R21 -7.55～-6.31 R22 -8.94～-7.56 f3 +7.03～+7.47 ND3 1.49～1.60 R31 +11.89～+18.38 R32 -5.88～-5.23 f4 +7.63～+8.87 ND4 1.50～1.55 R41 +18.12～+33.56 R42 -5.22～-4.79 f5 -4.78～-4.11 ND5 1.60～1.66 R51 -15.32～-11.43 R52 +3.25～+3.94 f6 +6.13～+7.99 ND6 1.50～1.55 R61 +6.16～+7.78 R62 -7.87～-6.06

[0078] Among them, f1 is the focal length of the first lens 1, ND1 is the refractive index of the first lens 1, R11 is the curvature radius of the object side of the first lens 1, and R12 is the curvature radius of the image side of the first lens 1;

[0079] f2 is the focal length of the second lens 2, ND2 is the refractive index of the second lens 2, R21 is the curvature radius of the object side of the second lens 2, and R22 is the curvature radius of the image side of the second lens 2;

[0080] f3 is the focal length of the third lens 3, ND3 is the refractive index of the third lens 3, R31 is the curvature radius of the object side of the third lens 3, and R32 is the curvature radius of the image side of the third lens 3;

[0081] f4 is the focal length of the fourth lens 4, ND4 is the refractive index of the fourth lens 4, R41 is the curvature radius of the object side of the fourth lens 4, and R42 is the curvature radius of the image side of the fourth lens 4;

[0082] f5 is the focal length of the fifth lens 5, ND5 is the refractive index of the fifth lens 5, R51 is the curvature radius of the object side of the fifth lens 5, and R52 is the curvature radius of the image side of the fifth lens 5;

[0083] f6 is the focal length of the sixth lens 6, ND6 is the refractive index of the sixth lens 6, and R61 is the curvature radius of the object side of the sixth lens 6;

[0084] Focal length: A "+" sign indicates that the lens has a positive optical power, and a "-" sign indicates that the lens has a negative optical power, with the unit being mm;

[0085] Radius of curvature: A "+" sign indicates that the surface bends towards the image side, and a "-" sign indicates that the surface bends towards the object side, with the unit being mm.

[0086] In the present utility model, the aspherical surfaces of the second lens 2, the fourth lens 4, the fifth lens 5, and the sixth lens 6 can all be defined by the following equation of an even-order aspherical surface:

[0087]

[0088] In the formula, Z is the sagittal height of the lens along the optical axis direction, k is the conic coefficient of the quadric surface, γ is the lens height, c is the lens curvature, and A - G are the coefficients of the 4th, 6th, 8th, 10th, 12th, 14th, and 16th order terms of the aspherical polynomial.

[0089] The following gives specific embodiments according to the above settings of the present utility model and specifically describes the hybrid glass-plastic scanning lens according to the present utility model. The data of the specific embodiments are summarized in Table 1 below:

[0090] Table 1

[0091] Specific embodiments -1.78 ≤ f1 / f ≤ -1.55 -1.62 -870.85 ≤ f2 / f ≤ +63.83 -133.22 +2.11 ≤ f3 / f ≤ +2.45 2.32 +2.23 ≤ f4 / f ≤ +2.76 2.50 -1.51 ≤ f5 / f ≤ -1.23 -1.39 +1.98 ≤ f6 / f ≤ +2.55 2.06 IC / TTL ≥ 0.14 0.15 6.95 ≤ TTL / f ≤ 7.33 7.25 0.19 ≤ OBFL / TTL ≤ 0.24 0.22 F#≤1.60 1.6 2.85 mm ≤ f ≤ 3.55 mm 3.1 TTL ≤ 22.5 mm 22.5 OBFL 4.9

[0092] Reference Figure 1 , Figure 2 shown, which are respectively the optical structure schematic diagram and the optical path structure schematic diagram of this embodiment.

[0093] In the lens of this embodiment, along the optical axis of the lens, from the object side to the image side, they are sequentially arranged:

[0094] The first lens 1, which is a spherical glass lens with a negative optical power, has a convex object side and a concave image side;

[0095] The second lens 2, which is an aspherical plastic lens with a positive or negative optical power, has a concave object side and a convex image side;

[0096] The third lens 3, which is a spherical glass lens with a positive optical power, has a convex object side and a convex image side;

[0097] The aperture stop 10;

[0098] The fourth lens 4, which is an aspherical plastic lens with a positive optical power, has a convex object side and a convex image side;

[0099] The fifth lens 5, which is an aspherical plastic lens with a negative optical power, has a concave object side and a concave image side;

[0100] The sixth lens 6 is an aspherical plastic lens with positive optical power, having a convex object side and a convex image side.

[0101] The filter 7;

[0102] The protective glass 8;

[0103] The image acquisition element 9, the protective glass 8 is integrated on the image acquisition element 9, and the image acquisition element 9 is disposed on the image side of the filter 7.

[0104] In this Embodiment 1, the lens is matched with a 1 / 2.7-inch chip, the field of view angle FOV of the lens system > 140°, the total focal length f of the lens system = 3.1 mm, the aperture value F# = 1.6, the total optical length TTL of the lens = 22.5 mm, and the optical back focal length OBFL of the lens = 4.9 mm.

[0105] In this embodiment, since the field of view angle FOV > 140°, the first lens 1 is a meniscus negative optical power glass spherical lens with a convex surface facing the object side and a concave surface facing the image side. On the one hand, it quickly converges light. On the other hand, using a glass spherical lens for the first lens 1 can increase the mechanical properties of the lens such as waterproofness and abrasion resistance. The Abbe numbers of the second lens 2 and the fourth lens 4 are less than 26, and the Abbe numbers of the fifth lens 5 and the sixth lens 6 are greater than 55. Such a combination can reduce the chromatic aberration of the system. Considering problems such as the aberration of the optical system, balance of temperature drift, and day-night co-focus, the curvature radii, central thicknesses, refractive indices, Abbe constants, and aspherical K values of each lens are designed as shown in Table 2.

[0106] Table 2 gives the curvature radius R (unit: mm) of each lens, the central thickness d (unit: mm) of each lens, the refractive index (ND) of each lens, the Abbe constant (VD), and the aspherical K value (Conic) of each lens.

[0107] Table 2

[0108]

[0109]

[0110] In Table 2, the curvature radius R represents the degree of curvature of the lens surface. A positive value represents that the surface bends towards the image side, and a negative value represents that the surface bends towards the object side, where "INFINITY" represents that the surface is a plane; the central thickness D represents the central axial distance from the current surface to the next surface, the refractive index ND represents the ability of the current lens material to refract light, the Abbe number VD represents the dispersion characteristic of the current lens material to light; the k value represents the numerical value of the best-fit conic coefficient of the aspherical surface. 11 represents the object side of the first lens 1, 12 represents the image side of the first lens 1, and so on.

[0111] The aspheric surfaces of the second lens 2, the fourth lens 4, the fifth lens 5, and the sixth lens 6 in the embodiments of the present utility model can all be defined by the above equations of even aspheric surfaces.

[0112] Table 3 gives the coefficients of the aspheric surfaces of each optical surface of the second lens 2, the fourth lens 4, the fifth lens 5, and the sixth lens 6.

[0113] Table 3

[0114] Surface serial number A B C D E F G 21 2.26E-04 1.26E-05 1.74E-05 -9.69E-07 -5.67E-07 1.12E-07 -6.42E-09 22 9.23E-04 1.44E-04 -8.65E-06 2.80E-08 3.29E-07 -2.43E-08 -6.44E-10 41 1.47E-03 -4.04E-05 -3.09E-05 1.22E-06 2.18E-07 -7.19E-08 -7.46E-11 42 -1.63E-03 -3.37E-04 -1.79E-05 -3.91E-06 -1.97E-07 1.40E-07 -9.32E-09 51 -7.62E-03 -6.66E-05 1.56E-05 -4.35E-06 -1.65E-06 3.38E-07 -1.09E-08 52 6.74E-04 7.37E-05 -1.12E-05 -5.19E-06 -8.77E-09 5.18E-08 -1.73E-09 61 1.24E-03 -2.40E-04 1.80E-06 -3.37E-06 1.33E-07 7.23E-08 -3.68E-09 62 -2.48E-04 2.13E-05 1.16E-05 1.87E-07 1.24E-07 1.55E-08 1.92E-09

[0115] Reference Figure 3 As shown, it is the field curvature curve graph of this lens in the present embodiment at visible light of 0.546 μm, where the vertical axis represents the semi-field angle value (unit: °), and the horizontal axis represents the field curvature amount (mm); it can be seen from Figure 4 this that the field curvature offset amounts in the meridional direction and the sagittal direction on the image plane are both controlled within ±0.03 mm, indicating that the field curvature correction of this lens is good.

[0116] Reference Figure 4 As shown, it is the distortion curve graph of this lens in the present embodiment at visible light of 0.546 μm. The horizontal axis represents the F-tan(Theta) distortion (unit: %), and the vertical axis represents the semi-field angle value (unit: °). It can be seen from the figure that the wide-angle large-aperture glass-plastic hybrid lens in the present embodiment can achieve a field of view angle >140° when combined with a 1 / 2.7-inch sensor, and the distortion is controlled within -60%, indicating that the distortion is well corrected.

[0117] Reference Figure 5 As shown, it is the ray aberration of the pupil coordinate function of this lens in the present embodiment at different field of view angles. Within the maximum scale of 30 μm, it indicates that the aberration control of each wavelength is well corrected.

[0118] In the present embodiment, reference Figures 6 - 9 As shown, the defocus amount of this lens at high temperature +80 °C, low temperature -40 °C, and infrared 0.850 μm is small, indicating that this lens can capture high-definition images at high temperature +80 °C and low temperature -40 °C and the actual captured images are clear when shooting at night.

[0119] In summary, the wide-angle large-aperture hybrid glass and plastic lens adopts a hybrid combination of 2 spherical glasses and 4 aspherical plastics. Under the condition of achieving the same quality in the industry, each lens is insensitive, the lens surface type is simple and easy to manufacture, and its processing cost is relatively low compared with those on the market. It has a high cost performance and can achieve the characteristics of small size, light weight, good performance and low cost. Moreover, the present utility model comprehensively considers problems such as the aberration of the optical system, the balance of temperature drift and day-night confocal imaging, etc. Through reasonable selection of lens materials, distribution of optical power and optimization of optical design, it can be matched with a 4K, 1 / 2.7-inch chip to achieve 24-hour all-weather high-definition monitoring, day-night imaging confocal, and the actual shooting pictures are clear at a high temperature of 80 °C and a low temperature of -40 °C.

[0120] The above description only represents the preferred technical solution of the present utility model, and its description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and the present utility model also intends to include these modifications and improvements.

Claims

1. A wide-angle, large-aperture glass-plastic hybrid lens, characterized by: Set along the lens optical axis from the object side to the image side in order: A first lens, wherein the first lens is a spherical glass lens with negative optical power, the object side surface of the first lens is convex, and the image side surface is concave; A second lens, wherein the second lens is an aspheric plastic lens with positive or negative optical power, the object side surface of the second lens is a concave surface, and the image side surface is a convex surface; a third lens, wherein the third lens is a spherical glass lens with positive power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; Aperture diaphragm; a fourth lens, wherein the fourth lens is an aspheric plastic lens with positive refractive power, the object side surface of the fourth lens is a convex surface, and the image side surface is a convex surface; A fifth lens, wherein the fifth lens is an aspheric plastic lens with negative optical power, wherein the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface; a sixth lens, wherein the sixth lens is an aspheric plastic lens with positive refractive power, wherein the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface; A filter, wherein the filter is disposed on the image side surface of the sixth lens; A protective glass and an image acquisition element, wherein the protective glass is integrated on the image acquisition element, and the image acquisition element is arranged on the image side of the filter; The lens satisfies the following relationship: IC / TTL ≥ 0.14, 6.95≤TTL / f≤7.33, 0.19≤OBFL / TTL≤0.24; F#≤1.60， TTL≤22.5mm, In the relationship, f is the total focal length of the lens, TTL is the total optical length of the lens, OBFL is the optical back focus of the lens, IC is the full image height of the 1 / 2.7-inch chip matched with the lens system, and F# is the aperture of the lens.

2. The wide-angle and large-aperture glass-plastic hybrid lens according to claim 1, characterized in that: The lens satisfies the following relationship: -1.78≤f1 / f≤-1.55, -870.85≤f2 / f≤+63.83, +2.11≤f3 / f≤+2.45, +2.23≤f4 / f≤+2.76, -1.51≤f5 / f≤-1.23, +1.98≤f6 / f≤+2.55; In the relationship, f is the total focal length of the lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.

3. The wide-angle and large-aperture glass-plastic hybrid lens according to claim 1, characterized in that: The total focal length of the lens is f, which satisfies 2.85mm≤f≤3.55mm.

4. The wide-angle and large-aperture glass-plastic hybrid lens according to claim 1, characterized in that: The focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are respectively in the range of -5.76 to -4.92, -2745.71 to -203.67, +7.03 to +7.47, +7.63 to +8.87, -4.78 to -4.11, and +6.13 to +7.99, wherein the "+" sign indicates that the lens has a positive focal power, and the "-" sign indicates that the lens has a negative focal power, and the unit of the focal length is mm; The refractive index ranges corresponding to the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are 1.55-1.65, 1.60-1.66, 1.49-1.60, 1.50-1.55, 1.60-1.66 and 1.50-1.55 respectively.

5. The wide-angle and large-aperture glass-plastic hybrid lens according to claim 1, characterized in that: The object side surface curvature radii corresponding to the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are in the range of +33.42 to +105.77, -7.55 to -6.31, +11.89 to +18.38, +18.12 to +33.56, -15.32 to -11.43, and +6.16 to +7.78, respectively; the image side surface curvature radii corresponding to the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are in the range of +2.67 to +3.22, -8.94 to -7.56, -5.88 to -5.23, -5.22 to -4.79, +3.25 to +3.94, and -7.87 to -6.06, respectively; wherein the "+" sign indicates that the surface is bent toward the image side, and the "-" sign indicates that the surface is bent toward the object side, and the unit of the curvature radius is mm.

6. The wide-angle and large-aperture glass-plastic hybrid lens according to claim 1, characterized in that: The filter is made of D263T glass.

7. The wide-angle and large-aperture glass-plastic hybrid lens according to claim 1, characterized in that: The aspheric surfaces of the second lens, the fourth lens, the fifth lens and the sixth lens satisfy the following formula: Wherein, Z is the vector height of the lens along the optical axis, k is the quadratic cone coefficient, γ is the lens height, c is the lens curvature, A, B, C, D, E, F, G are the 4th, 6th, 8th, 10th, 12th, 14th, and 16th order coefficients of the aspheric polynomial.

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