Imaging optical lens

Abstract

The present application discloses an imaging optical lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from the object side to the image forming side. The refractive index of the first lens is nd1, the angle of view of the imaging optical lens is FOV, the focal length of the imaging optical lens is f, and the image height of the imaging optical lens is IH, and the imaging optical lens satisfies the above conditional expressions of nd1≧1.70 and (FOV×f) / IH≧120.00. The imaging optical lens according to the present application has excellent optical performance, can satisfy design requirements for large aperture and small size, and has a high light receiving effect.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of optics, and particularly to imaging optical lenses.

Background Art

[0002] With the development of intelligent driving of automobiles, in-vehicle lenses are also being rapidly updated. In-vehicle cameras are favored by developers of autonomous driving technology due to their clear imaging effect. However, in-vehicle cameras are easily affected by environmental factors (such as strong light, rain, snow, etc.), and the shooting effect is low. Based on this, supplementing the information received by the in-vehicle lens using an in-vehicle lidar has important significance. The lidar uses a laser to perform target detection, obtains a target light wave signal from the reflected light, and performs information processing together with the emitted signal to obtain information such as the distance, speed, and azimuth of the detected target. For the lidar, the imaging optical lens is an indispensable part of the lidar, and the imaging optical lens can improve the detection effect by collimating the light beam of the lidar.

[0003] However, the conventional imaging optical lenses of lidars still cannot meet the design requirements of large aperture and miniaturization, have a low light receiving effect, and are difficult to meet the application requirements of intelligent driving.

Summary of the Invention

[0004] The embodiments of the present application aim to provide an imaging optical lens with excellent optical performance, which can meet the design requirements of large aperture and miniaturization, and has a high light receiving effect.

[0005] In order to solve the above technical problems, according to the present application, there is provided an imaging optical lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from the object side toward the imaging side, where the refractive index of the first lens is nd1, the angle of view of the imaging optical lens is FOV, the focal length of the imaging optical lens is f, the image height of the imaging optical lens is IH, and an imaging optical lens satisfying the conditional expressions nd1≥1.70 and (FOV×FNO) / IH≥120.00 is provided.

[0006] According to the present application, the following effects can be obtained. That is, according to the imaging optical lens of the present application with the above lens arrangement method, it has excellent optical performance, and has characteristics of a large aperture and miniaturization, and has an excellent light receiving effect.

Brief Description of the Drawings

[0007] To more clearly explain the technical solution means of the embodiments of the present application, the drawings necessary for the embodiments of the present application are briefly described below. A person skilled in the art can obtain other drawings based on these drawings without creative effort.

[0008]

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Embodiments for Carrying Out the Invention

[0009] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, each embodiment of this application will be described in detail below in conjunction with the drawings. However, those skilled in the art can understand that in each embodiment of this application, many technical details are presented to enable readers to better understand this application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed for the protection of this application can be realized.

[0010] In the embodiments of this application, the orientation or positional relationship indicated by "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly for better explaining this application and its embodiments, and do not limit that the indicated device, element, or component needs to have a specific orientation or perform structure and operation in a specific orientation.

[0011] In addition, in addition to indicating the orientation or positional relationship, the above partial terms may indicate other meanings. For example, the term "upper" can indicate some kind of dependency or connection relationship in some cases. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific situation.

[0012] Also, the terms "attach", "provide", "install", "form", "connect", and "couple" should be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or an integral structure, and may be a mechanical connection or an electrical connection, and may be a direct connection or an indirect connection through an intermediate medium, or an internal communication between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific situation.

[0013] In addition, in this specification, relational terms such as first and second are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Also, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article or apparatus that comprises a series of elements includes not only those elements but also other elements not expressly listed or elements inherent to such a process, method, article or apparatus. Without further limitation, an element limited by the phrase "comprising..." does not exclude the further presence of other like elements in the process, method, article or apparatus comprising said element.

[0014] (First Embodiment) Referring to FIG. 1, the imaging optical lens 10 according to the first embodiment of the present application includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged in order from the object side toward the imaging side. The refractive index of the first lens L1 is nd1, the angle of view of the imaging optical lens 10 is FOV, the focal length of the imaging optical lens 10 is f, and the image height of the imaging optical lens 10 is IH, and the following conditional expressions are satisfied. nd1≧1.70 (1) (FOV×f) / IH≧120.00 (2)

[0015] In conditional expression (1), it is specified that the refractive index nd1 of the first lens L1 is 1.70 or more. That is, the material of the first lens L1 is preferably an optical material with a high refractive index, and the tip (object side) aperture of the imaging optical lens 10 can be controlled to improve the imaging quality.

[0016] When conditional expression (2) is satisfied, the imaging optical lens 10 can achieve both a wide angle of view and telephoto, and realize medium-telephoto imaging of the imaging optical lens 10.

[0017] In this embodiment, a plurality of lenses (L1, L2, L3, L4, L5, L6) are provided, and by setting the refractive index nd1 of the first lens L1 and the imaging optical lens 10 within the ranges specified by the above conditional expressions (1) and (2), the imaging optical lens 10 has excellent optical performance, and has characteristics of large aperture and miniaturization, and has an excellent light receiving effect.

[0018] Preferably, the refractive index nd1 of the first lens L1 further satisfies the following conditional expression. nd1≦2.20 (3)

[0019] Preferably, the imaging optical lens 10 further satisfies the following conditional expression. (FOV×f) / IH≦150.00 (4)

[0020] Preferably, the combined focal length of the first lens L1 and the second lens L2 is f12, the focal length of the imaging optical lens 10 is f, and the following conditional expression is satisfied. -6.00≦f12 / f≦-1.20 (5)

[0021] In conditional expression (4), the proportional value between the combined focal length f12 of the first lens L1 and the second lens L2 and the focal length f of the imaging optical lens 10 is specified. When conditional expression (4) is satisfied, the balance of the amount of field curvature of the system (imaging optical lens 10) can be effectively achieved, and the shift amount of the field curvature of the central field of view can be made smaller than 0.04 mm, whereby the imaging optical lens 10 has excellent imaging accuracy.

[0022] Preferably, the radius of curvature of the object side surface of the third lens L3 is R5, the radius of curvature of the imaging side surface of the third lens L3 is R6, and the following conditional expression is satisfied. -5.00≦R5 / R6≦-1.20 (6)

[0023] In conditional expression (6), by specifying the shape of the third lens L3 such that the proportional value between the radius of curvature R5 of the object side surface of the third lens L3 and the radius of curvature R6 of the imaging side surface of the third lens L3 satisfies the range specified by conditional expression (6), the degree of deflection when light passes through the third lens L3 can be alleviated. Therefore, chromatic aberration can be effectively corrected, and the chromatic aberration |LC| ≤ 3.5 μm can be achieved.

[0024] Preferably, the radius of curvature of the object side surface of the fourth lens L4 is R7, and the radius of curvature of the imaging side surface of the fourth lens L4 is R8, and the following conditional expression is satisfied. -4.00 ≤ R7 / R8 ≤ -1.00 (7)

[0025] In conditional expression (7), by specifying the shape of the fourth lens L4 such that the proportional value between the radius of curvature R7 of the object side surface of the fourth lens L4 and the radius of curvature R8 of the imaging side surface of the fourth lens L4 satisfies the range specified by conditional expression (7), the degree of deflection when light passes through the fourth lens L4 can be alleviated. Therefore, the imaging optical lens 10 has excellent imaging quality and low sensitivity.

[0026] Preferably, the thickness on the optical axis of the fifth lens L5 is d9, and the thickness on the optical axis of the sixth lens L6 is d11, and the following conditional expression is satisfied. 1.40 ≤ d9 / d11 ≤ 5.00 (8)

[0027] In conditional expression (8), the proportional value between the thickness d9 on the optical axis of the fifth lens L5 and the thickness d11 on the optical axis of the sixth lens L6 is specified. When conditional expression (8) is satisfied, the lens thicknesses of the fifth lens L5 and the sixth lens L6 can be controlled, making it easier to perform injection molding of the fifth lens L5 and the sixth lens L6, and the manufacturing difficulty of the imaging optical lens 10 can be reduced.

[0028] In this embodiment, a portion of the object side surface of the first lens L1 close to the optical axis is a convex surface, a portion of the imaging side surface of the first lens L1 close to the optical axis is a concave surface, and the first lens L1 has a negative refractive power. In other preferred embodiments, the first lens L1 may have a positive refractive power, and the object side surface and the imaging side surface of the first lens L1 may be provided with other concave and convex distributions.

[0029] Preferably, the radius of curvature of the object side surface of the first lens L1 is R1, the radius of curvature of the imaging side surface of the first lens L1 is R2, the focal length of the first lens L1 is f1, the focal length of the imaging optical lens 10 is f, the thickness of the first lens L1 on the optical axis is d1, the overall length of the imaging optical lens 10 system is TTL, and the following relational expressions are satisfied. 0.33 ≦ (R1 + R2) / (R1 - R2) ≦ 1.97 (9) -3.54 ≦ f1 / f ≦ -0.54 (10) 0.02 ≦ d1 / TTL ≦ 0.22 (11)

[0030] In conditional expression (9), the shape of the first lens L1 is specified. When this conditional expression is satisfied, the degree of deflection when light passes through the first lens L1 can be relaxed, so that aberrations can be effectively reduced. More preferably, 0.53 ≦ (R1 + R2) / (R1 - R2) ≦ 1.57 is satisfied. In conditional expression (10), the proportional value between the focal length f1 of the first lens and the focal length f of the imaging optical lens 10 is specified. When the above conditional expression is satisfied, the optical performance of the imaging optical lens 10 can be improved. More preferably, -2.21 ≦ f1 / f ≦ -0.68 is satisfied. In conditional expression (11), the proportional value between the thickness d1 of the first lens L1 on the optical axis and the thickness of the overall length TTL of the imaging optical lens 10 system is specified. When the above conditional expression is satisfied, the ultra-thin design of the imaging optical lens 10 can be achieved. More preferably, 0.03 ≦ d1 / TTL ≦ 0.17 is satisfied.

[0031] In this embodiment, a portion of the object side surface of the second lens L2 close to the optical axis is concave, a portion of the imaging side surface of the second lens L2 close to the optical axis is convex, and the second lens L2 has a positive refractive power. In any other embodiment, the object side surface and the imaging side surface of the second lens L2 may be provided with other concave and convex distributions, and the second lens L2 may have a negative refractive power.

[0032] Preferably, the radius of curvature of the object side surface of the second lens L2 is R3, the radius of curvature of the imaging side surface of the second lens L2 is R4, the focal length of the second lens L2 is f2, the focal length of the imaging optical lens 10 is f, the thickness of the second lens L2 on the optical axis is d3, the overall length of the imaging optical lens 10 system is TTL, and the following relational expressions are satisfied. 0.54 ≦ (R3 + R4) / (R3 - R4) ≦ 1.71 (12) 1.66 ≦ f2 / f ≦ 5.87 (13) 0.02 ≦ d3 / TTL ≦ 0.09 (14)

[0033] In conditional expression (12), the shape of the second lens L2 is specified. When the above conditional expression is satisfied, the degree of deflection when light passes through the second lens L2 can be alleviated, so that aberration can be effectively reduced. Preferably, 0.87 ≦ (R3 + R4) / (R3 - R4) ≦ 1.37 is satisfied. In conditional expression (13), the proportional value between the focal length f2 of the second lens L2 and the focal length f of the imaging optical lens 10 is specified. When the conditional expression is satisfied, the optical performance of the imaging optical lens 10 can be improved. More preferably, 2.65 ≦ f2 / f ≦ 4.70 is satisfied. In conditional expression (14), the proportional value between the thickness d3 of the second lens L2 on the optical axis and the overall length TTL of the imaging optical lens 10 system is specified. When the above conditional expression is satisfied, the overall length TTL of the imaging optical lens 10 system can be compressed, and the ultra-thin design of the imaging optical lens 10 can be achieved. More preferably, 0.03 ≦ d3 / TTL ≦ 0.07 is satisfied.

[0034] In this embodiment, a portion of the object side surface of the third lens L3 close to the optical axis is a concave surface, a portion of the imaging side surface of the third lens L3 close to the optical axis is a concave surface, and the third lens L3 has a negative refractive power. In any other embodiment, the object side surface and the imaging side surface of the third lens L3 may be provided with other concave and convex distributions, and the third lens L3 may have a positive refractive power.

[0035] Preferably, the radius of curvature of the object side surface of the third lens L3 is R5, the radius of curvature of the imaging side surface of the third lens L3 is R6, the focal length of the third lens L3 is f3, the focal length of the imaging optical lens 10 is f, the thickness of the third lens L3 on the optical axis is d5, and the overall length of the imaging optical lens 10 system is TTL, and the following relational expressions are satisfied. 0.05 ≦ (R5 + R6) / (R5 - R6) ≦ 1.00 (15) -7.30 ≦ f3 / f ≦ -1.56 (16) 0.02 ≦ d5 / TTL ≦ 0.12 (17)

[0036] In conditional expression (15), the shape of the third lens L3 is specified, and since the degree of deflection when light passes through the third lens L3 can be alleviated, chromatic aberration can be effectively corrected, and chromatic aberration |LC| ≦ 3.5 μm can be achieved. More preferably, 0.07 ≦ (R5 + R6) / (R5 - R6) ≦ 0.80 is satisfied. In conditional expression (16), the proportional value between the focal length f3 of the third lens L3 and the focal length f of the imaging optical lens 10 is specified. When this conditional expression is satisfied, the aberrations of the imaging optical lens 10 can be reduced, and at the same time, the imaging optical lens 10 can be designed to be ultrathin and wide-angle. More preferably, -4.56 ≦ f3 / f ≦ -1.95 is satisfied. In conditional expression (17), the proportional value between the thickness d5 of the third lens L3 on the optical axis and the overall length TTL of the imaging optical lens 10 system is specified. When the above conditional expression is satisfied, the overall length TTL of the imaging optical lens 10 system can be reasonably controlled, and the imaging optical lens 10 can be designed to be ultrathin. More preferably, 0.03 ≦ d5 / TTL ≦ 0.09 is satisfied.

[0037] In this embodiment, a portion of the object side surface of the fourth lens L4 close to the optical axis is a convex surface, a portion of the imaging side surface of the fourth lens L4 close to the optical axis is a convex surface, and the fourth lens L4 has a positive refractive power. In any other embodiment, the object side surface and the imaging side surface of the fourth lens L4 may be provided with other concave and convex distributions, and the fourth lens L4 may have a negative refractive power.

[0038] Preferably, the radius of curvature of the object side surface of the fourth lens L4 is R7, the radius of curvature of the imaging side surface of the fourth lens L4 is R8, the focal length of the fourth lens L4 is f4, the focal length of the imaging optical lens 10 is f, the thickness of the fourth lens L4 on the optical axis is d7, the overall length of the imaging optical lens 10 system is TTL, and the following relational expressions are satisfied. 0.00≦(R7+R8) / (R7-R8)≦0.90 (18) 0.61≦f4 / f≦2.69 (19) 0.03≦d7 / TTL≦0.27 (20)

[0039] In conditional expression (18), the shape of the fourth lens L4 is specified. When the above conditional expression is satisfied, by reducing the degree of deflection when the light beam passes through the fourth lens L4, the imaging optical lens 10 can have excellent imaging quality and low sensitivity. More preferably, it satisfies 0.00≦(R7+R8) / (R7-R8)≦0.72. In conditional expression (19), the proportional value between the focal length f4 of the fourth lens L4 and the focal length f of the imaging optical lens 10 is specified. By reasonably distributing the internal focal length of the imaging optical lens 10, the imaging optical lens 10 can have excellent imaging quality and low sensitivity. More preferably, it satisfies 0.98≦f4 / f≦2.15. In conditional expression (20), the proportional value between the thickness d7 on the optical axis of the fourth lens L4 and the overall system length TTL of the imaging optical lens 10 is specified. When this conditional expression is satisfied, the overall system length TTL of the imaging optical lens 10 can be effectively compressed, and the imaging optical lens 10 can be designed to be ultrathin. More preferably, it satisfies 0.05≦d7 / TTL≦0.21.

[0040] In the present embodiment, the portion of the fifth lens L5 near the optical axis on the object side surface is a convex surface, the portion of the fifth lens L5 near the optical axis on the imaging side surface is a concave surface, and the fifth lens L5 has a positive refractive power. In any other embodiment, the object side surface and the imaging side surface of the fifth lens L5 may be provided with other concave and convex distributions, and the fifth lens L5 may have a negative refractive power.

[0041] Preferably, the radius of curvature of the object side surface of the fifth lens L5 is R9, the radius of curvature of the imaging side surface of the fifth lens L5 is R10, the focal length of the fifth lens L5 is f5, the focal length of the imaging optical lens 10 is f, the thickness on the optical axis of the fifth lens L5 is d9, the overall system length of the imaging optical lens 10 is TTL, and the following relational expressions are satisfied. -17.54≦(R9+R10) / (R9-R10)≦-1.95 (21) 4.38≦f5 / f≦45.60 (22) 0.06≦d9 / TTL≦0.36 (23)

[0042] In conditional expression (21), the shape of the fifth lens L5 is specified. When the above conditional expression is satisfied, the optical performance of the imaging optical lens 10 can be improved. More preferably, -10.96 ≦ (R9 + R10) / (R9 - R10) ≦ -2.44 is satisfied. In conditional expression (22), the proportional value between the focal length f5 of the fifth lens L5 and the focal length f of the imaging optical lens 10 is specified. When the above conditional expression is satisfied, the optical performance of the imaging optical lens 10 can be improved. More preferably, 7.01 ≦ f5 / f ≦ 36.48 is satisfied. In conditional expression (23), the thickness d9 on the optical axis of the fifth lens L5 and the overall system length TTL of the imaging optical lens 10 are specified. The imaging optical lens 10 can be designed to be ultrathin. More preferably, 0.10 ≦ d9 / TTL ≦ 0.29 is satisfied.

[0043] In the present embodiment, a portion of the object side surface of the sixth lens L6 close to the optical axis is a convex surface, a portion of the imaging side surface of the sixth lens L6 close to the optical axis is a concave surface, and the sixth lens L6 has a positive refractive power. In any other embodiment, the object side surface and the imaging side surface of the sixth lens L6 may be provided with other concave and convex distributions, and the sixth lens L6 may have a negative refractive power.

[0044] Preferably, the radius of curvature of the object side surface of the sixth lens L6 is R11, the radius of curvature of the imaging side surface of the sixth lens L6 is R12, the focal length of the sixth lens L6 is f6, the focal length of the imaging optical lens 10 is f, the thickness on the optical axis of the sixth lens L6 is d11, the overall system length of the imaging optical lens 10 is TTL, and the following relational expressions are satisfied. -5.98 ≦ (R11 + R12) / (R11 - R12) ≦ -1.50 (24) 0.92 ≦ f6 / f ≦ 4.36 (25) 0.02 ≦ d11 / TTL ≦ 0.14 (26)

[0045] In conditional expression (24), the shape of the sixth lens L6 is specified. When the conditional expression is satisfied, it is possible to correct the aberration of off-axis picture angles generated in the process of designing the ultra-thin wide-angle imaging optical lens 10 to be more preferable, -3.74 ≦ (R11 + R12) / (R11 - R12) ≦ -1.87 is satisfied. In conditional expression (25), the range of the proportional value between the focal length f6 of the sixth lens L6 and the focal length f of the imaging optical lens 10 is specified. When the conditional expression is satisfied, by rationally distributing the internal focal length of the imaging optical lens 10, the imaging optical lens 10 has excellent imaging quality and low sensitivity, and more preferably, 1.48 ≦ f6 / f ≦ 3.49. In conditional expression (26), the range of the proportional value between the thickness d11 on the optical axis of the sixth lens L6 and the overall system length TTL of the imaging optical lens 10 is specified, and it is possible to achieve the ultra-thin design of the imaging optical lens 10, and more preferably, 0.03 ≦ d11 / TTL ≦ 0.11 is satisfied.

[0046] Preferably, the F number of the imaging optical lens 10 is FNO and further satisfies the following conditional expression. FNO ≦ 1.30 (27)

[0047] In conditional expression (27), the F number of the aperture of the imaging optical lens 10 is specified. When the conditional expression (27) is satisfied, while achieving the miniaturization design of the imaging optical lens 10, it is possible to realize a larger amount of incident light, thereby improving the measurement distance of the imaging optical lens 10, improving the environmental light resistance ability of the imaging optical lens 10, and ensuring that the imaging optical lens 10 has an excellent light receiving effect.

[0048] In the present embodiment, the first lens L1 is made of glass material, the second lens L2 is made of resin material, the third lens L3 is made of resin material, the fourth lens L4 is made of glass material, the fifth lens L5 is made of resin material, and the sixth lens L6 is made of resin material. In other preferred embodiments, each lens may be made of other materials.

[0049] In this embodiment, an optical element such as an optical filter GF is provided between the sixth lens L6 and the imaging surface Si. The optical filter GF may be a cover glass or an optical filter. As shown in FIG. 1, a first optical filter GF1 and a second optical filter GF2 are provided between the sixth lens L6 and the imaging surface Si. In other embodiments, the optical filter GF may be provided at other positions.

[0050] The imaging optical lens 10 of the present application has excellent optical performance, large aperture and miniaturization characteristics, and excellent light receiving effect. According to the optical characteristics of the imaging optical lens 10, the imaging optical lens 10 can be particularly adapted to detection devices or equipment such as in-vehicle lidars.

[0051] Hereinafter, the imaging optical lens 10 according to the present application will be described using examples. The reference numerals described in each example are as shown in Table 1. The units of the focal length, the distance on the optical axis, the radius of curvature, the thickness on the optical axis, the position of the inflection point, and the position of the stopping point are mm.

[0052] TTL is the overall optical length (the distance on the optical axis from the object side surface of the first lens L1 to the imaging surface Si), and the unit is mm.

[0053] Preferably, in order to meet the requirements of high-quality imaging, an inflection point and / or a stopping point may be further provided on the object side surface and / or the imaging side surface of the lens. Specific embodiments will be described below.

[0054] FIG. 1 is a schematic diagram showing the structure of the imaging optical lens 10 according to the first embodiment. Hereinafter, the design data of the imaging optical lens 10 according to the first embodiment of the present application will be shown.

[0055] Table 1 shows the radius of curvature R of the object side and the image side of the first lens L1 to the sixth lens L6 constituting the imaging optical lens 10 in the first embodiment of the present application, the thickness on the optical axis of the lens, the distance d on the optical axis between the lenses, the refractive index nd, and the Abbe number vd. Table 2 shows the conic coefficient k and the aspherical coefficient of the imaging optical lens 10. In this embodiment, the units of distance, radius, and thickness are all mm.

[0056] [Table 1]

[0057] The meanings of the symbols in Table 1 are as follows. R: Radius of curvature of the optical surface, center radius of curvature in the case of a lens S1: Diaphragm R1: Radius of curvature of the object side surface of the first lens L1 R2: Radius of curvature of the image side surface of the first lens L1 R3: Radius of curvature of the object side surface of the second lens L2 R4: Radius of curvature of the image side surface of the second lens L2 R5: Radius of curvature of the object side surface of the third lens L3 R6: Radius of curvature of the image side surface of the third lens L3 R7: Radius of curvature of the object side surface of the fourth lens L4 R8: Radius of curvature of the image side surface of the fourth lens L4 R9: Radius of curvature of the object side surface of the fifth lens L5 R10: Radius of curvature of the image side surface of the fifth lens L5 R11: Radius of curvature of the object side surface of the sixth lens L6 R12: Radius of curvature of the image side surface of the sixth lens L6 R15: Radius of curvature of the object side surface of the first optical filter GF1 R16: Radius of curvature of the image side surface of the first optical filter GF1 R17: Radius of curvature of the object side surface of the second optical filter GF2 R18: Radius of curvature of the image side surface of the second optical filter GF2 d: Thickness on the optical axis of the lens, or distance on the optical axis between adjacent lenses d0: Optical axis distance from the aperture S1 to the object side surface of the first lens L1 d1: Thickness on the optical axis of the first lens L1 d2: Optical axis distance from the image forming side surface of the first lens L1 to the object side surface of the second lens L2 d3: Thickness on the optical axis of the second lens L2 d4: Optical axis distance from the image forming side surface of the second lens L2 to the object side surface of the third lens L3 d5: Thickness on the optical axis of the third lens L3 d6: Optical axis distance from the image forming side surface of the third lens L3 to the object side surface of the fourth lens L4 d7: Thickness on the optical axis of the fourth lens L4 d8: Optical axis distance from the image forming side surface of the fourth lens L4 to the object side surface of the fifth lens L5 d9: Thickness on the optical axis of the fifth lens L5 d10: Optical axis distance from the image forming side surface of the fifth lens L5 to the object side surface of the sixth lens L6 d11: Thickness on the optical axis of the sixth lens L6 d12: Optical axis distance from the image forming side surface of the sixth lens L6 to the object side surface of the first optical filter GF1 d13: Thickness on the optical axis of the first optical filter GF1 d14: Optical axis distance from the image forming side surface of the first optical filter GF1 to the object side surface of the second optical filter GF2 d15: Thickness on the optical axis of the second optical filter GF2 d16: Optical axis distance from the image forming side surface of the second optical filter GF2 to the image plane Si nd: Refractive index of the d-line (the d-line is green light with a wavelength of 550 nm) nd1: Refractive index of the first lens L1 nd2: Refractive index of the second lens L2 nd3: Refractive index of the third lens L3 nd4: Refractive index of the fourth lens L4 nd5: Refractive index of the fifth lens L5 nd6: Refractive index of the sixth lens L6 ndg1: Refractive index of the first optical filter GF1 ndg2: Refractive index of the second optical filter GF2 vd: Abbe number vd1: Abbe number of the first lens L1 vd2: Abbe number of the second lens L2 vd3: Abbe number of the third lens L3 vd4: Abbe number of the fourth lens L4 vd5: Abbe number of the fifth lens L5 vd6: Abbe number of the sixth lens L6 vg1: Abbe number of the first optical filter GF1 vg2: Abbe number of the second optical filter GF2

[0058]

Table 2

[0059] In addition, in this embodiment, the aspherical surfaces of the respective lenses are aspherical surfaces as shown in the following conditional expression (28). However, the specific embodiment of the following conditional expression (28) is an example, and actually, the present application is not limited to the form of the aspherical polynomial represented by the conditional expression (28). y=(c 2 / r) / [1+{1(k+1)(c 2 / r 2 )} 1 / 2 +A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r 14 +A16r 16 +A18r 18 +A20r 20 (28)

[0060] Here, k is the conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20 are the aspherical coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between the point on the aspherical curve and the optical axis, and z is the aspherical depth (the perpendicular distance between the point on the aspherical surface where the distance from the optical axis is r and the tangent plane that touches the vertex on the aspherical optical axis).

[0061] Tables 3 and 4 show the design data of the curvature points and the inflection points of each lens in the imaging optical lens 10 according to the embodiment of the present application. Here, P1R1 and P1R2 represent the object side surface and the imaging side surface of the first lens L1, respectively, P2R1 and P2R2 represent the object side surface and the imaging side surface of the second lens L2, respectively, P3R1 and P3R2 represent the object side surface and the imaging side surface of the third lens L3, respectively, P4R1 and P4R2 represent the object side surface and the imaging side surface of the fourth lens L4, respectively, P5R1 and P5R2 represent the object side surface and the imaging side surface of the fifth lens L5, respectively, and P6R1 and P6R2 represent the object side surface and the imaging side surface of the sixth lens L6, respectively. The data corresponding to the "curvature point position" column is the vertical distance from the curvature point provided on the surface of each lens to the optical axis of the imaging optical lens 10. The data corresponding to the "inflection point position" column is the vertical distance from the inflection point provided on the surface of each lens to the optical axis of the imaging optical lens 10.

[0062] [Table 3]

[0063] [Table 4]

[0064] In addition, Table 25 described later shows the values corresponding to various parameters in the first embodiment and the parameters specified by the conditional expressions.

[0065] FIG. 2 is a schematic diagram of the field curvature and distortion aberration of light with a wavelength of 850 nm after passing through the imaging optical lens 10 according to the first embodiment. FIG. 3 is a schematic diagram of the longitudinal chromatic aberration of light with wavelengths of 830 nm, 850 nm, and 870 nm after passing through the imaging optical lens 10 according to the first embodiment. FIG. 4 is a schematic diagram of the lateral chromatic aberration of light with wavelengths of 830 nm, 850 nm, and 870 nm after passing through the imaging optical lens 10 according to the first embodiment.

[0066] As shown in Table 25, the first embodiment satisfies each conditional expression.

[0067] In this embodiment, the effective aperture of the imaging optical lens 10 is 2.237 mm, the image height of the entire field of view is 3.300 mm, and the angle of view in the diagonal direction is 148.20°. The imaging optical lens 10 satisfies the characteristics of a large aperture and miniaturization, and the chromatic aberration on and off the optical axis is sufficiently corrected, and it has excellent optical characteristics.

[0068] (Second Embodiment) FIG. 5 is a schematic diagram showing the structure of the imaging optical lens 20 according to the second embodiment. The second embodiment is substantially the same as the first embodiment, and the meanings of the reference numerals are the same as those in the first embodiment. Hereinafter, only the differences will be listed.

[0069] Tables 5 and 6 show the design data of the imaging optical lens 20 according to the second embodiment of the present application.

[0070]

Table 5

[0071]

Table 6

[0072] Tables 7 and 8 show the design data of the curvature points and the stopping points of each lens in the imaging optical lens 20 according to the second embodiment of the present application.

[0073]

Table 7

[0074]

Table 8

[0075] Also, Table 25 to be described later further shows the values corresponding to the various parameters in the second embodiment and the parameters specified by the conditional expressions.

[0076] FIG. 6 is a schematic diagram of the field curvature and distortion of light with a wavelength of 850 nm after passing through the imaging optical lens 20 according to the second embodiment. FIG. 7 is a schematic diagram of the longitudinal chromatic aberration of light with wavelengths of 830 nm, 850 nm, and 870 nm after passing through the imaging optical lens 20 according to the second embodiment. FIG. 8 is a schematic diagram of the lateral chromatic aberration of light with wavelengths of 830 nm, 850 nm, and 870 nm after passing through the imaging optical lens 20 according to the second embodiment.

[0077] As shown in Table 25, the second embodiment satisfies each conditional expression.

[0078] In the present embodiment, the effective aperture of the imaging optical lens 20 is 2.112 mm, the image height of the entire field of view is 3.300 mm, and the angle of view in the diagonal direction is 156.40°. The imaging optical lens 20 satisfies the characteristics of large aperture and miniaturization, and the chromatic aberration on and off the optical axis is sufficiently corrected, and it has excellent optical characteristics.

[0079] (Third Embodiment) FIG. 9 is a schematic diagram showing the structure of the imaging optical lens 30 according to the third embodiment. The third embodiment is substantially the same as the first embodiment, and the meanings of the reference signs are the same as those in the first embodiment. Hereinafter, only the differences will be listed.

[0080] A portion of the object side surface of the first lens L1 close to the optical axis is a concave surface.

[0081] Tables 9 and 10 show the design data of the imaging optical lens 30 according to the third embodiment of the present application.

[0082]

Table 9

[0083]

Table 10

[0084] Tables 11 and 12 show the design data of the curvature points and the stationary points of each lens in the imaging optical lens 30 according to the third embodiment of the present application.

[0085] [Table 11]

[0086] [Table 12]

[0087] In addition, Table 25 described later further shows the values corresponding to the various parameters in the third embodiment and the parameters specified by the conditional expressions.

[0088] FIG. 10 is a schematic diagram of the field curvature and distortion aberration of light with a wavelength of 850 nm after passing through the imaging optical lens 30 according to the third embodiment. FIG. 11 is a schematic diagram of the longitudinal chromatic aberration of light with wavelengths of 830 nm, 850 nm, and 870 nm after passing through the imaging optical lens 30 according to the third embodiment. FIG. 12 is a schematic diagram of the lateral chromatic aberration of light with wavelengths of 830 nm, 850 nm, and 870 nm after passing through the imaging optical lens 30 according to the third embodiment.

[0089] As shown in Table 25, the third embodiment satisfies each conditional expression.

[0090] In the present embodiment, the effective aperture of the imaging optical lens 30 is 2.750 mm, the image height of the entire field of view is 3.300 mm, and the angle of view in the diagonal direction is 115.88°. The imaging optical lens 30 satisfies the characteristics of a large aperture and miniaturization, and the chromatic aberration on and off the optical axis is sufficiently corrected, and it has excellent optical characteristics.

[0091] (Fourth Embodiment) FIG. 13 is a schematic diagram showing the structure of the imaging optical lens 40 according to the fourth embodiment. The fourth embodiment is substantially the same as the first embodiment, and the meanings of the reference numerals are the same as those in the first embodiment. Hereinafter, only the differences will be listed.

[0092] Tables 13 and 14 show the design data of the imaging optical lens 40 according to the fourth embodiment of the present application.

[0093] [Table 13]

[0094] [Table 14]

[0095] Tables 15 and 16 show the design data of the curvature points and the stopping points of each lens in the imaging optical lens 40 according to the fourth embodiment of the present application.

[0096] [Table 15]

[0097] [Table 16]

[0098] In addition, Table 25 to be described later further shows the values corresponding to the various parameters in the fourth embodiment and the parameters specified by the conditional expressions.

[0099] FIG. 14 is a schematic diagram of the field curvature and distortion aberration of light with a wavelength of 850 nm after passing through the imaging optical lens 40 according to the fourth embodiment. FIG. 15 is a schematic diagram of the lateral chromatic aberration of light with wavelengths of 830 nm, 850 nm, and 870 nm after passing through the imaging optical lens 40 according to the fourth embodiment. FIG. 16 is a schematic diagram of the axial chromatic aberration of light with wavelengths of 830 nm, 850 nm, and 870 nm after passing through the imaging optical lens 40 according to the fourth embodiment.

[0100] As shown in Table 25, the fourth embodiment satisfies each conditional expression.

[0101] In this embodiment, the effective aperture of the imaging optical lens 40 is 2.157 mm, the image height of the entire field of view is 3.300 mm, and the angle of view in the diagonal direction is 143.88°. The imaging optical lens 40 satisfies the characteristics of a large aperture and miniaturization, and the chromatic aberration on and off the optical axis is sufficiently corrected, and it has excellent optical characteristics.

[0102] (Fifth Embodiment) FIG. 17 is a schematic diagram showing the structure of the imaging optical lens 50 according to the fifth embodiment. The fifth embodiment is substantially the same as the first embodiment, and the meanings of the reference numerals are the same as those in the first embodiment. Hereinafter, only the differences will be listed.

[0103] Tables 17 and 18 show the design data of the imaging optical lens 50 according to the fifth embodiment of the present application.

[0104] [Table 17]

[0105] [Table 18]

[0106] Tables 19 and 20 show the design data of the curvature points and the stop points of each lens in the imaging optical lens 50 according to the fifth embodiment of the present application.

[0107] [Table 19]

[0108] [Table 20]

[0109] In addition, Table 25 described later further shows the values corresponding to the various parameters in the fifth embodiment and the parameters specified by the conditional expressions.

[0110] FIG. 18 is a schematic diagram of the field curvature and distortion of light with a wavelength of 850 nm after passing through the imaging optical lens 50 according to the fifth embodiment. FIG. 19 is a schematic diagram of the longitudinal chromatic aberration of light with wavelengths of 830 nm, 850 nm, and 870 nm after passing through the imaging optical lens 50 according to the fifth embodiment. FIG. 20 is a schematic diagram of the lateral chromatic aberration of light with wavelengths of 830 nm, 850 nm, and 870 nm after passing through the imaging optical lens 50 according to the fifth embodiment.

[0111] As shown in Table 25, the fifth embodiment satisfies each conditional expression.

[0112] In the present embodiment, the effective aperture of the imaging optical lens 50 is 2.187 mm, the image height of the entire field of view is 3.300 mm, and the angle of view in the diagonal direction is 155.20°. The imaging optical lens 50 satisfies the characteristics of a large aperture and miniaturization, and the chromatic aberration on and off the optical axis is sufficiently corrected, and it has excellent optical characteristics.

[0113] (Comparative Embodiment) FIG. 21 is a schematic diagram showing the structure of the imaging optical lens 60 according to the comparative embodiment. The meanings of the reference numerals in the comparative embodiment are the same as those in the first embodiment, and only the differences will be listed below.

[0114] Tables 21 and 22 show the design data of the imaging optical lens 60 according to the comparative embodiment.

[0115] [Table 21]

[0116] [Table 22]

[0117] Tables 23 and 24 show the design data of the curvature points and stopping points of each lens in the imaging optical lens 60 according to the comparative embodiment.

[0118] [Table 23]

[0119]

Table 24

[0120] FIG. 22 is a schematic diagram of the astigmatic image surface curvature and distortion of light with a wavelength of 850 nm after passing through the imaging optical lens 60 according to the comparative embodiment. FIG. 23 is a schematic diagram of the longitudinal chromatic aberration of light with wavelengths of 830 nm, 850 nm, and 870 nm after passing through the imaging optical lens 60 according to the comparative embodiment. FIG. 24 is a schematic diagram of the lateral chromatic aberration of light with wavelengths of 830 nm, 850 nm, and 870 nm after passing through the imaging optical lens 60 according to the comparative embodiment.

[0121] Table 25 lists the values corresponding to each conditional expression of the comparative embodiment according to the above conditions. Apparently, the imaging optical lens 60 according to the comparative embodiment does not satisfy the conditional expression of nd1 ≧ 1.70.

[0122] In the comparative embodiment, the effective aperture of the imaging optical lens 60 is 2.463 mm, the image height of the entire field of view is 3.300 mm, and the angle of view in the diagonal direction is 133.90°. The imaging optical lens 60 does not have excellent optical characteristics, and the chromatic aberration on and off the optical axis is not sufficiently corrected.

[0123]

Table 25

[0124] As described above, the imaging optical lens according to the embodiment of the present application has been described in detail, and the principle and examples of the present application have been described using specific examples in this specification. However, the description of the above examples is only for easily understanding the idea of the present application, and it is possible to change the specific examples and the scope of application. In short, the content of this specification should not be understood as limiting the present application.

Claims

1. 1. An imaging optical lens, comprising: The optical system includes a lens structure including a first lens having negative refractive power, a second lens having positive refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having positive refractive power, and a sixth lens having positive refractive power, which are arranged in this order from the object side to the image side, The refractive index of the first lens is nd1, The field of view of the imaging optical lens is FOV, the focal length of the imaging optical lens is f; the image height of the imaging optical lens is IH, a portion of the object side surface of the second lens that is close to the optical axis is concave, a portion of the imaging side surface of the second lens that is close to the optical axis is a convex surface, the radius of curvature of the object-side surface of the second lens is R3; the radius of curvature of the image-forming side surface of the second lens is R4; The focal length of the second lens is f2, The thickness of the second lens on the optical axis is d3, the total system length of the imaging optical lens is TTL; nd1≧1.70 (FOV × f) / IH≧120.00 0.54≦(R3+R4) / (R3-R4)≦1.71 1.66≦f2 / f≦5.87 0.02≦d3 / TTL≦0.09 Satisfy the above conditional expression, Imaging optical lens.

2. An imaging optical lens, The optical system includes a lens structure including a first lens having negative refractive power, a second lens having positive refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having positive refractive power, and a sixth lens having positive refractive power, which are arranged in this order from the object side to the image side, The refractive index of the first lens is nd1, The field of view of the imaging optical lens is FOV, the focal length of the imaging optical lens is f; the image height of the imaging optical lens is IH, a portion of the object side surface of the third lens that is close to the optical axis is concave, a portion of the imaging side surface of the third lens that is close to the optical axis is concave; the radius of curvature of the object-side surface of the third lens is R5; the radius of curvature of the image-forming side surface of the third lens is R6; The focal length of the third lens is f3, The thickness of the third lens on the optical axis is d5, the total system length of the imaging optical lens is TTL; nd1≧1.70 (FOV × f) / IH≧120.00 0.05≦(R5+R6) / (R5-R6)≦1.00 −7.30≦f3 / f≦−1.56 0.02≦d5 / TTL≦0.12 Satisfy the above conditional expression, Imaging optical lens.

3. An imaging optical lens, The optical system includes a lens structure including a first lens having negative refractive power, a second lens having positive refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having positive refractive power, and a sixth lens having positive refractive power, which are arranged in this order from the object side to the image side, The refractive index of the first lens is nd1, The field of view of the imaging optical lens is FOV, the focal length of the imaging optical lens is f; the image height of the imaging optical lens is IH, a portion of the object side surface of the fifth lens that is close to the optical axis is a convex surface, a portion of the imaging side surface of the fifth lens that is close to the optical axis is concave, the radius of curvature of the object-side surface of the fifth lens is R9, the radius of curvature of the image-forming side surface of the fifth lens is R10; The focal length of the fifth lens is f5, The fifth lens has an axial thickness of d9, the total system length of the imaging optical lens is TTL; nd1≧1.70 (FOV × f) / IH≧120.00 -17.54≦(R9+R10) / (R9-R10)≦-1.95 4.38≦f5 / f≦45.60 0.06≦d9 / TTL≦0.36 Satisfy the above conditional expression, Imaging optical lens.

4. the radius of curvature of the object-side surface of the third lens is R5; the radius of curvature of the image-forming side surface of the third lens is R6; -5.00≦R5 / R6≦-1.20 Satisfy the above conditional expression, The imaging optical lens according to claim 1 .

5. the radius of curvature of the object-side surface of the fourth lens is R7, the radius of curvature of the image-forming side surface of the fourth lens is R8; -4.00≦R7 / R8≦-1.00 Satisfy the above conditional expression, The imaging optical lens according to claim 1 .

6. The fifth lens has an axial thickness of d9, The sixth lens has an axial thickness of d11, 1.40≦d9 / d11≦5.00 Satisfy the above conditional expression, The imaging optical lens according to claim 1 .

7. a composite focal length of the first lens and the second lens is f12; -6.00≦f12 / f≦-1.20 Satisfy the above conditional expression, The imaging optical lens according to claim 1 .

8. The field angle FOV and focal length f of the imaging optical lens are (FOV × f) / IH≦150.00 The above conditional expression is further satisfied. The imaging optical lens according to claim 1 .

9. A portion of the imaging side of the first lens close to the optical axis is concave, the radius of curvature of the object-side surface of the first lens is R1; the radius of curvature of the image-forming side surface of the first lens is R2; The focal length of the first lens is f1, The thickness of the first lens on the optical axis is d1, the total system length of the imaging optical lens is TTL; 0.33≦(R1+R2) / (R1-R2)≦1.97 −3.54≦f1 / f≦−0.54 0.02≦d1 / TTL≦0.22 Satisfy the above conditional expression, The imaging optical lens according to claim 1 .

10. A portion of the object side of the fourth lens close to the optical axis is convex, a portion of the image-forming side surface of the fourth lens that is close to the optical axis is a convex surface, the radius of curvature of the object-side surface of the fourth lens is R7, the radius of curvature of the image-forming side surface of the fourth lens is R8; The focal length of the fourth lens is f4, The thickness of the fourth lens on the optical axis is d7, the total system length of the imaging optical lens is TTL; 0.00≦(R7+R8) / (R7-R8)≦0.90 0.61≦f4 / f≦2.69 0.03≦d7 / TTL≦0.27 Satisfy the above conditional expression, The imaging optical lens according to claim 1 .

11. A portion of the object side of the sixth lens close to the optical axis is a convex surface, a portion of the imaging side surface of the sixth lens that is close to the optical axis is concave, the radius of curvature of the object side surface of the sixth lens is R11, The radius of curvature of the image-forming side surface of the sixth lens is R12, The sixth lens has a focal length of f6. The sixth lens has an axial thickness of d11, the total system length of the imaging optical lens is TTL; -5.98≦(R11+R12) / (R11-R12)≦-1.50 0.92≦f6 / f≦4.36 0.02≦d11 / TTL≦0.14 Satisfy the above conditional expression, The imaging optical lens according to claim 1 .

12. The fourth lens is made of glass. The imaging optical lens according to claim 1 .

Images