Optical lens and fixed-focus wide-angle lens for welcome lamp

Abstract

The invention relates to the technical field of optical imaging, and particularly discloses an optical lens and a fixed-focus wide-angle lens for a welcome lamp, the optical lens comprises seven lenses with fixed positions and an infrared filter, the first lens to the sixth lens and the infrared filter are sequentially arranged from an object side to an image side along an optical axis, the first lens is a glass aspheric surface, the fourth lens is a glass spherical mirror, the other lenses are plastic aspheric mirrors, the seven lenses do not make contact with one another or only make contact at the edges, the seven lenses cannot move with one another, the second lens is a glass aspheric surface, the fourth lens is a glass spherical mirror, and the other lenses are plastic aspheric mirrors. Compared with the prior art, relative illumination can be efficiently improved, imaging definition can be greatly optimized, meanwhile, strong high and low temperature resistance is achieved, high-definition pictures can be stably output even in the low-illumination environment, the complex light environment or the high-temperature exposure environment or the low-temperature severe cold environment, and a seamless linkage welcome lamp achieves the intelligent functions that the lamp is turned on after being triggered by a human face, the brightness is adjusted through identity matching, and a visitor tracks the lamp to follow up.

Description

Technical Field

[0001] This invention relates to the field of optical imaging technology, and in particular to an optical lens and a fixed-focus wide-angle lens for welcome lights. Background Technology

[0002] With the continuous evolution of AI-related technologies such as intelligent algorithms and computer vision, the concept of intelligence has deeply penetrated the imaging equipment industry. The stable and efficient operation of the imaging system supporting the welcome lights relies on the core support of three key lens performance characteristics: the lens's illumination adaptation capability is the prerequisite for accurately capturing faces (determining the recognizability of the image under low light / strong light conditions); the lens's imaging clarity is the core of achieving accurate identity matching (directly affecting the accuracy of the welcome light's linkage response); and the lens's high and low temperature resistance is the key to ensuring uninterrupted operation around the clock (avoiding equipment failure under extreme temperatures). Summary of the Invention

[0003] In view of this, in order to achieve a wide field of view while also taking into account the advantages of large aperture, high definition, no condensation, and miniaturization, and to make the lens suitable for intelligent imaging fields such as intelligent welcoming, security monitoring, drones, and autonomous driving, this invention provides an optical lens and a fixed-focus wide-angle lens for welcoming lights.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are fixedly arranged sequentially along the optical axis from the object side to the image side. The object-side surface of the first lens is convex near the optical axis, and the image-side surface is concave near the optical axis, making it a negative lens; The image-side surface of the second lens is concave near the optical axis and convex near the optical axis, thus it is a negative lens; The object-side surface of the third lens is convex near the optical axis, and the image-side surface is concave near the optical axis, making it a positive lens; The object-side surface of the fourth lens is convex near the optical axis, and the image-side surface is convex near the optical axis, making it a positive lens; The image-side surface of the fifth lens is convex near the optical axis, and it is a positive lens. The object-side surface of the sixth lens is concave near the optical axis, and the image-side surface is convex near the optical axis, making it a negative lens; The object-side surface of the seventh lens is convex near the optical axis, and the image-side surface is convex near the optical axis, making it a positive lens; The first lens is a negative lens, the second lens is a negative lens, the third lens is a positive lens, the fourth lens is a positive lens, the fifth lens is a positive lens, the sixth lens is a negative lens, and the seventh lens is a positive lens. The seven lenses do not contact each other or only contact at their edges, and they cannot move from each other. The second lens is a glass aspherical lens, the fourth lens is a glass spherical lens, and the first, third, fifth, sixth, and seventh lenses are all plastic aspherical lenses. The optical lens satisfies: 1.20<|f 12 / f|<1.23, Where f is the focal length of the optical lens, f 12 The combined focal length of the first lens and the second lens is used. By reasonably configuring the optical power of the first lens and the second lens, and using two lenses with negative optical power, large-angle light rays at the front end can be quickly converged, the light transmission of the system can be increased, and the introduction of off-axis aberrations can be reduced. The optical lens satisfies: 0.94<|f 12 / f 345 |<0.98, Among them, f 12 f is the combined focal length of the first lens and the second lens. 345 By controlling the ratio of the combined focal lengths of the third, fourth, and fifth lenses, the front-end system composed of the first and second lenses can be reasonably adapted and connected to the transition system composed of the third, fourth, and fifth lenses. This allows for a smooth convergence and transition of large-angle light rays from the front-end system, corrects the field curvature generated by the first and second lenses, reduces the deflection angle of the light rays, and improves the imaging sharpness of the optical lens, thereby enhancing the imaging quality of the optical lens.

[0005] As a further improvement to the above technical solution: An optimized version of the above technical solution is that the optical lens satisfies the following: 1.23 <f 345 / f<1.29, Controlling their ratio allows for the reasonable configuration of the optical power of the first and second lenses, which helps to smoothly converge large-aperture light rays from the front end to the rear, thereby reducing the light deflection angle, correcting chromatic aberration, balancing various aberrations, improving resolving power, and effectively reducing tolerance sensitivity, thus enhancing the imaging quality of the optical lens.

[0006] 1.17 <f 45 / f<1.23, By controlling their ratio and rationally configuring the optical power of the fourth and fifth lenses to form the back-end system, the aberrations generated by the front system can be effectively corrected, and the relative illumination can be improved.

[0007] Where f is the focal length of the optical lens, f 345 f is the combined focal length of the third, fourth, and fifth lenses. 45 The combined focal length of the fourth and fifth lenses is given.

[0008] An optimized version of the above technical solution is that the optical lens satisfies the following: 1.45≤D1 / R1≤1.63, Where D1 is the diameter of the first lens and R1 is the radius of curvature of the object side of the first lens at the optical axis. Controlling their ratio helps to reduce the aperture of the front-end system and achieve miniaturization.

[0009] An optimized version of the above technical solution is that the optical lens satisfies the following: 0.98≤f4 / (dn / dt(4))≤1.01, 1.91≤|f2 / (dn / dt(2)) |≤2.02, Where f4 is the focal length of the fourth lens, dn / dt(4) is the expansion coefficient of the fourth lens, f2 is the focal length of the second lens, and dn / dt(2) is the expansion coefficient of the second lens. By controlling their ratio, the fourth lens is made of a material with a reasonable expansion coefficient, which helps the lens maintain good resolution at high and low temperatures and has good temperature adaptability.

[0010] An optimized version of the above technical solution is that the optical lens satisfies the following: 0.83≤R5 / R6≤0.86 Where R5 is the radius of curvature of the object-side surface of the third lens at the optical axis, and R6 is the radius of curvature of the image-side surface of the third lens at the optical axis. By controlling their ratio range, the shape of the third lens is close to a concentric circle, resulting in an optical path difference between the peripheral rays and the central rays, diverging the central rays before they enter the rear optical system. This reduces the front aperture of the lens, decreases its size, and facilitates miniaturization and cost reduction.

[0011] An optimized version of the above technical solution is that the optical lens satisfies the following: 2.16≤f1 / f≤2.06 3.79≤f² / f≤-3.66 14.9 ≤ f3 / f ≤ 15.7 1.82≤f4 / f≤1.91, 2.26≤f5 / f≤2.38 -1.55≤f6 / f≤-1.47, 1.89≤f7 / f≤1.92, Where f is the focal length of the optical 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 third lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens. By satisfying the ratio, the optical power distribution can be uniform and reasonable, the high and low temperature performance can be good, the aberration can be easily corrected, and the image quality can be good.

[0012] An optimized version of the above technical solution is that the optical lens satisfies the following: -1.31≤R9 / R 10 ≤-1.28, Where R9 is the radius of curvature of the object side of the fifth lens at the optical axis, R 10 The radius of curvature of the image side of the fifth lens at the optical axis is denoted by . By controlling the range of its ratio, the adjacent shapes of the fifth lenses are similar, which reduces their sensitivity and facilitates a smooth transition of light to the rear.

[0013] An optimized version of the above technical solution is to provide an aperture stop at the surface of the object plane of the third lens, which can easily achieve a large field of view, high image quality, high illumination, and small size.

[0014] An optimized version of the above technical solution is that the optical lens meets the following requirements: aperture number 1.5 < F number < 1.8, field of view greater than 115°, total optical length not greater than 20mm, working wavelength 400-700nm, and meets imaging requirements when used in an environment of 40℃ to 80℃.

[0015] An optimized version of the above technical solution is that an infrared filter is fixedly disposed on the image side of the seventh lens.

[0016] The present invention also provides a fixed-focus wide-angle lens for welcoming guests, which adopts the optical lens described above.

[0017] Compared with existing technologies, the beneficial effects of this invention are: The optical lens provided by this invention, with its first and second lenses configured to compress large-aperture light, increases light transmission and rapidly converges large-aperture light on the object side, thus helping to eliminate aberrations produced by the first lens and reduce the system aperture. The third, fourth, and fifth lenses work together to receive large-aperture light from the front and smoothly transition it to the rear, shortening the optical path difference between the center and edge fields of view, reducing distortion, and improving relative illumination. Simultaneously, they effectively correct paraxial spherical aberration, reduce peripheral astigmatism curvature, and improve resolution. The configuration of the sixth and seventh lenses helps to move the principal point of the optical system away from the image side, thereby effectively shortening the overall length of the optical imaging system. Through a design similar to a telecentric optical path on the image side, the sixth and seventh lenses reduce the back focal length, decrease CRA, converge light, correct aberrations, and improve system resolution, while also effectively correcting distortion in the edge field of view and reducing optical lens distortion.

[0018] The seven-element fixed-focus wide-angle glass-plastic hybrid lens provided by this invention, with its advantages of glass-plastic hybrid structure, can efficiently improve relative illumination and significantly optimize image clarity. At the same time, it has strong high and low temperature resistance, and can stably output high-definition images even in low light, complex lighting, high temperature exposure, or low temperature extreme cold environments. It can seamlessly link with welcome lights to realize intelligent functions such as "lighting on when triggered by face, adjusting brightness according to identity, and following the visitor's light." It can create a high-quality intelligent welcome experience for hotels, shopping malls, office buildings and other places, and has important application value in welcome light supporting image systems. At the same time, it has broad application prospects in intelligent welcome scenarios in high-end venues.

[0019] The optical lens provided by this invention has advantages such as a large field of view, no pyrolysis, high resolution, high illumination, and small size. This optical lens is particularly suitable for intelligent imaging fields such as intelligent reception, security monitoring, drones, and autonomous driving. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the optical lens in Embodiment 1 of the present invention; Figure 2 This is an MTF curve of the optical lens of Embodiment 1 of the present invention at +20°C; Figure 3 This is a relative illumination curve of the optical lens in Embodiment 1 of the present invention; Figure 4 This is a graph showing the MTF defocus curve of the optical lens at +20°C in Embodiment 1 of the present invention. Figure 5 This is the MTF defocus curve of the optical lens in Embodiment 1 of the present invention at -40℃; Figure 6 This is a graph showing the MTF defocus curve of the optical lens at +80°C in Embodiment 1 of the present invention. Figure 7This is a schematic diagram of the structure of the optical lens in Embodiment 2 of the present invention; Figure 8 This is the +20℃ MTF curve of the optical lens in Embodiment 2 of the present invention; Figure 9 This is a relative illumination curve of the optical lens in Embodiment 2 of the present invention; Figure 10 This is the MTF defocus curve of the optical lens at +20℃ in Embodiment 2 of the present invention; Figure 11 This is the MTF defocus curve of the optical lens in Embodiment 2 of the present invention at -40℃; Figure 12 This is the MTF defocus curve of the optical lens at +80°C in Embodiment 2 of the present invention; Figure 13 This is a schematic diagram of the structure of the optical lens in Embodiment 3 of the present invention; Figure 14 This is the MTF curve of the optical lens in Embodiment 3 of the present invention at +20°C; Figure 15 This is a relative illumination curve of the optical lens in Embodiment 3 of the present invention; Figure 16 This is the MTF defocus curve of the optical lens at +20℃ in Embodiment 3 of the present invention; Figure 17 This is the MTF defocus curve of the optical lens in Embodiment 3 of the present invention at -40℃; Figure 18 This is the MTF defocus curve of the optical lens at +80°C in Embodiment 3 of the present invention.

[0021] Figure descriptions: 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Sixth lens; 7. Seventh lens; 8. Aperture; 9. Infrared filter. Detailed Implementation

[0022] The technical solutions in the embodiments of this technical solution will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this technical solution, and not all embodiments.

[0023] In the description of this technical solution, unless otherwise stated, "multiple" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this technical solution and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this technical solution. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this technical solution, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this technical solution based on the specific circumstances.

[0025] In this technical solution, it should be noted that the object side of the lens refers to the side of the lens facing the object, and the image side refers to the side of the lens facing the imaging plane. When a cross-section is made at any point on the object side surface of the lens, if the object side surface is always located on the image side of the cross-section and its radius of curvature is positive, then the object side surface of the lens is convex; otherwise, the object side surface of the lens is concave. When a cross-section is made at any point on the image side surface of the lens, if the image side surface is always on the object side of the cross-section and its radius of curvature is negative, then the image side surface of the lens is convex; otherwise, the image side surface of the lens is concave. If a cross-section is made at any point on either the object side surface or the cross-section of the image side surface of the lens, and the object side surface or the image side surface is partially on the image side and partially on the object side of the cross-section, then the surface has a point of inflection. The above method still applies to determining the concavity or convexity of the object side and image side surfaces near the optical axis.

[0026] Furthermore, the equations for the aspherical curves of each aspherical lens are expressed as follows: ; Where Z is the distance vector from the origin of the aspherical surface at a height of r along the optical axis; c is the paraxial curvature of the aspherical surface (radius of curvature R = 1 / c, which is the reciprocal of curvature); k is the conic coefficient; Ai is the i-th order coefficient of the aspherical surface, and the higher order coefficients used in this invention are A4, A6, A8, A10, A12, A14, and A16.

[0027] The main component of this technical solution is the optical lens. Based on this optical lens design, it is then applied to a fixed-focus wide-angle lens for welcoming guests. A detailed description of the optical lens is as follows: From the appendix Figure 1 , Figure 7 and Figure 13 It can be seen that the lenses with optical power that are fixed in sequence from the object side to the image side along the optical axis are the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the sixth lens (6), the seventh lens (7), the infrared filter (9), and the imaging plane. In the attached figure, IMA is the imaging plane.

[0028] The seven lenses do not touch each other or only touch at the edges, and cannot be moved from one another. The fourth lens (4) is a glass spherical mirror, and the rest of the lenses are plastic aspherical mirrors.

[0029] Furthermore, all of the above lenses are designed with the following parameters: First, it can be seen that the object-side surface of the first lens (1) is convex near the optical axis and the image-side surface is concave near the optical axis, making it a negative lens; the image-side surface of the second lens (2) is concave near the optical axis and convex near the optical axis, making it a negative lens; the object-side surface of the third lens (3) is convex near the optical axis and the image-side surface is concave near the optical axis, making it a positive lens; the object-side surface of the fourth lens (4) is convex near the optical axis and the image-side surface is convex near the optical axis, making it a positive lens; the image-side surface of the fifth lens (5) is convex near the optical axis and the image-side surface is convex near the optical axis, making it a positive lens; the object-side surface of the sixth lens (6) is concave near the optical axis and the image-side surface is convex near the optical axis, making it a negative lens; the object-side surface of the seventh lens (7) is convex near the optical axis and the image-side surface is convex near the optical axis, making it a positive lens; Secondly, relevant parameter limitations were also designed for the interaction between lenses, as detailed below: 2.16≤f1 / f≤2.06; 3.79≤f² / f≤-3.66; 14.9 ≤ f3 / f ≤ 15.7; 1.82≤f4 / f≤1.91; 2.26≤f5 / f≤2.38; -1.55≤f6 / f≤-1.47; 1.89≤f7 / f≤1.92; 1.20<|f 12 / f|<1.23; 0.94<|f 12 / f 345 |<0.98; 1.23 <f 345 / f<1.29; 1.17 <f 45 / f<1.23; 1.45≤D1 / R1≤1.63; 0.98≤f4 / (dn / dt(4))≤1.01; 1.91≤|f2 / (dn / dt(2)) |≤2.02; 0.83≤R5 / R6≤0.86; -1.31≤R9 / R 10 ≤-1.28; Where f is the focal length of the optical lens, f1 is the focal length of the first lens (1), f2 is the focal length of the second lens (2), f3 is the focal length of the third lens (3), f4 is the focal length of the third lens (3), f5 is the focal length of the fifth lens (5), f6 is the focal length of the sixth lens (6), f7 is the focal length of the seventh lens (7), f 12 f is the combined focal length of the first lens (1) and the second lens (2). 345 f is the combined focal length of the third lens (3), the fourth lens (4), and the fifth lens (5). 45 The combined focal length of the fourth lens (4) and the fifth lens (5) is given by: D1 is the diameter of the first lens (1), R1 is the radius of curvature of the object side of the first lens (1) at the optical axis, dn / dt (4) is the expansion coefficient of the fourth lens (4), dn / dt (2) is the expansion coefficient of the second lens (2), R5 is the radius of curvature of the object side of the third lens (3) at the optical axis, R6 is the radius of curvature of the image side of the third lens (3) at the optical axis, R9 is the radius of curvature of the object side of the fifth lens (5) at the optical axis, and R... 10 Let be the radius of curvature of the image side of the fifth lens (5) at the optical axis; Finally, the overall requirements for the optical lens are: aperture number 1.5 < F-number < 1.8, field of view greater than 115°, total optical length not greater than 20mm, working wavelength 400-700nm, and meeting imaging requirements when used in an environment of 40℃ to 80℃.

[0030] Example 1 As attached Figure 1 As shown, based on the above parameter formula, a set of optical lenses is obtained. The specific design parameters of this embodiment are as follows:

[0031] The remaining detailed parameters related to aspherical surfaces are shown in the table below:

[0032] Based on the above parameter design and testing, the specific results are as follows: ① Figure 2This is the MTF curve of this embodiment. As shown in the figure, the MTF of the full field of view modulation function is greater than 57% at 120 lp / mm, which has high clarity. ② Figure 3 This is a relative illumination curve for this embodiment, where the relative illumination of the optical lens across the entire field of view is greater than 62%. ③ Figure 4 This is a defocus curve of the lens in this embodiment at 20°C. The defocus curve shows the relationship between the meridional and sagittal MTF and the defocus amount for different fields of view at a set frequency of 120 lp / mm. ④ Figure 5 This is the defocus curve of this embodiment at -40℃. Compared with the defocus curve at 20℃, there is no obvious defocus and the image quality is clear. Figure 6 This is the defocus curve at 80°C in this embodiment. Compared with the defocus curve at 20°C, there is no obvious defocus and the image quality is clear.

[0033] Example 2 As attached Figure 7 As shown, based on the above parameter formula, a set of optical lenses is obtained. The specific design parameters of this embodiment are as follows:

[0034] The remaining detailed parameters related to aspherical surfaces are shown in the table below:

[0035] Based on the above parameter design and testing, the specific results are as follows: ① Figure 8 This is the MTF curve of this embodiment. As shown in the figure, the MTF of the full field of view modulation function is greater than 53% at 120 lp / mm, which has high clarity. ② Figure 9 This is a relative illumination curve for this embodiment, where the relative illumination of the optical lens across the entire field of view is greater than 59%. ③ Figure 10 This is a defocus curve of the lens in this embodiment at 20°C. The defocus curve shows the relationship between the meridional and sagittal MTF and the defocus amount for different fields of view at a set frequency of 120 lp / mm. ④ Figure 11 This is the defocus curve of this embodiment at -40℃. Compared with the defocus curve at 20℃, there is no obvious defocus and the image quality is clear. ⑤ Figure 12 This is the defocus curve at 80°C in this embodiment. Compared with the defocus curve at 20°C, there is no obvious defocus and the image quality is clear.

[0036] Example 3 As attached Figure 13As shown, based on the above parameter formula, a set of optical lenses is obtained. The specific design parameters of this embodiment are as follows:

[0037] The remaining detailed parameters related to aspherical surfaces are shown in the table below:

[0038] Based on the above parameter design and testing, the specific results are as follows: ① Figure 14 This is the MTF curve of this embodiment. As shown in the figure, the MTF of the full field of view modulation function is greater than 61% at 120 lp / mm, which has high clarity. ② Figure 15 This is a relative illumination curve for this embodiment, where the relative illumination of the optical lens across the entire field of view is greater than 65%. ③ Figure 16 This is a defocus curve of the lens in this embodiment at 20°C. The defocus curve shows the relationship between the meridional and sagittal MTF and the defocus offset for different fields of view at a set frequency of 120 lp / mm. ④ Figure 17 This is the defocus curve of this embodiment at -40℃. Compared with the defocus curve at 20℃, there is no obvious defocus and the image quality is clear. ⑤ Figure 18 This is the defocus curve at 80°C in this embodiment. Compared with the defocus curve at 20°C, there is no obvious defocus, and the image quality is clear.

[0039] As can be seen from Embodiments 1 to 3, the optical lens provided by this technical solution adopts a seven-element lens structure. Through reasonable lens property matching, when specific conditions are met, the optical lens has advantages such as large field of view, large aperture, no pyrolysis, small size, high definition, and high illumination. At the same time, it has good optical imaging capabilities. Therefore, the optical lens of this technical solution is suitable for intelligent imaging fields such as intelligent welcoming, security monitoring, drones, and autonomous driving.

[0040] The above are merely preferred embodiments of this technical solution, but the scope of protection of this technical solution is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this technical solution, based on the technical solution and its concept, should be included within the scope of protection of this technical solution.

Claims

1. An optical lens comprising a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5), a sixth lens (6), and a seventh lens (7) fixedly arranged sequentially along the optical axis from the object side to the image side, characterized in that, The object-side surface of the first lens (1) is convex near the optical axis, and the image-side surface is concave near the optical axis, making it a negative lens; The image-side surface of the second lens (2) is concave near the optical axis and convex near the optical axis, making it a negative lens; The object-side surface of the third lens (3) is convex near the optical axis, and the image-side surface is concave near the optical axis, making it a positive lens; The object-side surface of the fourth lens (4) is convex near the optical axis, and the image-side surface is convex near the optical axis, making it a positive lens; The image-side surface of the fifth lens (5) is convex near the optical axis, and is a positive lens; The object-side surface of the sixth lens (6) is concave near the optical axis, and the image-side surface is convex near the optical axis, making it a negative lens; The object-side surface of the seventh lens (7) is convex near the optical axis, and the image-side surface is convex near the optical axis, making it a positive lens; Among them, the second lens (2) is a glass aspherical mirror, the fourth lens (4) is a glass spherical mirror, and the first lens (1), the third lens (3), the fifth lens (5), the sixth lens (6) and the seventh lens (7) are all plastic aspherical mirrors; The optical lens satisfies: 1.20 <|f 12 / f|<1.23, Where f is the focal length of the optical lens, f 12 The combined focal length of the first lens (1) and the second lens (2); The optical lens satisfies: 0.94<|f 12 / f 345 |<0.98, Among them, f 12 f is the combined focal length of the first lens (1) and the second lens (2). 345 The combined focal length of the third lens (3), the fourth lens (4) and the fifth lens (5).

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 1.23 <f 345 / f<1.29, 1.17 <f 45 / f<1.23, Where f is the focal length of the optical lens, f 345 f is the combined focal length of the third lens (3), the fourth lens (4), and the fifth lens (5). 45 The combined focal length of the fourth lens (4) and the fifth lens (5) is given.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 1.45≤D1 / R1≤1.63, Where D1 is the diameter of the first lens (1) and R1 is the radius of curvature of the object side of the first lens (1) at the optical axis.

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 0.98≤f4 / (dn / dt(4))≤1.01, 1.91≤|f2 / (dn / dt(2)) |≤2.02, Where f4 is the focal length of the fourth lens (4), dn / dt (4) is the expansion coefficient of the fourth lens (4), f2 is the focal length of the second lens (2), and dn / dt (2) is the expansion coefficient of the second lens (2).

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 0.83≤R5 / R6≤0.86 Wherein, R5 is the radius of curvature of the object side of the third lens (3) at the optical axis, and R6 is the radius of curvature of the image side of the third lens (3) at the optical axis.

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 2.16≤f1 / f≤2.06 3.79≤f² / f≤-3.66 14.9 ≤ f3 / f ≤ 15.7 1.82≤f4 / f≤1.91, 2.26≤f5 / f≤2.38 -1.55≤f6 / f≤-1.47, 1.89≤f7 / f≤1.92, Where f is the focal length of the optical lens, f1 is the focal length of the first lens (1), f2 is the focal length of the second lens (2), f3 is the focal length of the third lens (3), f4 is the focal length of the third lens (3), f5 is the focal length of the fifth lens (5), f6 is the focal length of the sixth lens (6), and f7 is the focal length of the seventh lens (7).

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies: -1.31≤R9 / R 10 ≤-1.28, Where R9 is the radius of curvature of the object side of the fifth lens (5) at the optical axis, R 10 Let be the radius of curvature of the image side of the fifth lens (5) at the optical axis.

8. The optical lens according to claim 1, characterized in that, An aperture (8) is provided at the surface of the object measuring surface of the third lens (3).

9. The optical lens according to claim 1, characterized in that, An infrared filter (9) is fixedly provided on the image side of the seventh lens (7).

10. A fixed-focus wide-angle lens for welcoming guests, characterized in that, A fixed-focus wide-angle lens for welcoming guests, employing the optical lens described in any one of claims 1 to 9.

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