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] FIELD OF THE DISCLOSURE Embodiments of the present application relate to the field of optics, and more particularly to imaging optical lenses. [Background technology]

[0002] With the development of intelligent driving of automobiles, on-board lenses are also rapidly updated. On-board cameras are favored by developers of autonomous driving technology due to their clear imaging effect. However, on-board cameras are easily affected by environmental factors (strong light, rain, snow, etc.), and the shooting effect is low. Based on this, it is of great significance to use on-board LIDAR to supplement the information received by the on-board lens, and the LIDAR uses a laser to perform target detection, obtains a target light wave signal from the reflected light, and processes the information together with the emitted signal to obtain information such as the distance, speed, and direction of the detected target. For the LIDAR, the imaging optical lens is an essential 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 imaging optical lens of a conventional LIDAR still cannot meet the design requirements of large diameter and small size, and has a low light receiving effect, which makes it difficult to meet the application requirements of intelligent driving. Summary of the Invention

[0004] An object of the embodiments of the present application is to provide an imaging optical lens that has excellent optical performance, can satisfy design requirements for a large aperture and small size, and has a high light receiving efficiency.

[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 to the image formation side, wherein 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 above conditional expressions nd1≧1.70, (FOV×FNO) / IH≧120.00 are satisfied.

[0006] According to the present application, the following effects can be obtained: That is, due to the above-mentioned lens arrangement method, the imaging optical lens of the present application has excellent optical performance, has a large aperture and a small size, and has an excellent light receiving effect. [Brief description of the drawings]

[0007] In order to more clearly describe the technical solutions of the embodiments of the present application, the drawings necessary for the embodiments of the present application are briefly described below, and those skilled in the art can derive other drawings based on these drawings without any creative efforts.

[0008] [Figure 1] 1 is a schematic diagram showing the structure of an imaging optical lens according to a first embodiment of the present application. [Diagram 2] 2 is a schematic diagram of the field curvature and distortion of the imaging optical lens shown in FIG. 1. [Diagram 3] 2 is a schematic diagram of lateral chromatic aberration of the imaging optical lens shown in FIG. 1. [Figure 4] 2 is a schematic diagram of axial chromatic aberration of the imaging optical lens shown in FIG. 1. [Diagram 5] FIG. 4 is a schematic diagram showing the structure of an imaging optical lens according to a second embodiment of the present application. [Figure 6] 6 is a schematic diagram of the field curvature and distortion of the imaging optical lens shown in FIG. 5. [Figure 7] 6 is a schematic diagram of lateral chromatic aberration of the imaging optical lens shown in FIG. 5. [Figure 8] 6 is a schematic diagram of axial chromatic aberration of the imaging optical lens shown in FIG. 5. [Figure 9] FIG. 11 is a schematic diagram showing the structure of an imaging optical lens according to a third embodiment of the present application. [Figure 10] 10A and 10B are schematic diagrams of the field curvature and distortion of the imaging optical lens shown in FIG. [Figure 11] 10 is a schematic diagram of lateral chromatic aberration of the imaging optical lens shown in FIG. 9. [Figure 12] 10 is a schematic diagram of axial chromatic aberration of the imaging optical lens shown in FIG. [Figure 13] FIG. 11 is a schematic diagram showing the structure of an imaging optical lens according to a fourth embodiment of the present application. [Figure 14] 14 is a schematic diagram of the field curvature and distortion of the imaging optical lens shown in FIG. 13. [Figure 15] 14 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in FIG. 13. [Figure 16] 14 is a schematic diagram of axial chromatic aberration of the imaging optical lens shown in FIG. 13. [Figure 17] FIG. 13 is a schematic diagram showing the structure of an imaging optical lens according to a fifth embodiment of the present application. [Figure 18] 18 is a schematic diagram of the field curvature and distortion of the imaging optical lens shown in FIG. 17. [Figure 19] 18 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in FIG. 17. [Figure 20] 18 is a schematic diagram of axial chromatic aberration of the imaging optical lens shown in FIG. 17. [Figure 21] FIG. 11 is a schematic diagram showing the structure of an imaging optical lens according to a comparative embodiment. [Figure 22] 22A to 22C are schematic diagrams of the field curvature and distortion of the imaging optical lens shown in FIG. 21. [Diagram 23] 22 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in FIG. 21. [Figure 24] 22 is a schematic diagram of axial chromatic aberration of the imaging optical lens shown in FIG. 21. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0010] In the embodiments of the present application, the orientations or positional relationships indicated as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. are based on the orientations or positional relationships shown in the drawings. These terms are primarily intended to better explain the present application and its embodiments, and are not intended to limit the devices, elements or components shown to have a specific orientation or to be constructed and operated in a specific orientation.

[0011] In addition, the above-mentioned moieties may have other meanings besides indicating an orientation or positional relationship, for example, the term "up" may indicate some dependency or connection relationship in some cases. Those skilled in the art can understand the specific meanings of these terms in the present application according to the specific circumstances.

[0012] In addition, the terms "attach," "provide," "install," "form," "connect," and "couple" should be understood in a broad sense. For example, they may be a fixed connection, a removable connection, or an integral structure, a mechanical connection, an electrical connection, a direct connection, 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 the present application according to the specific situation.

[0013] It should be noted that, in this specification, relational terms such as first and second are merely intended to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that any such actual relationship or sequence exists between these entities or operations. Also, the terms "comprise", "comprises" or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that includes a set of elements not only includes those elements, but also includes other elements not expressly recited, or includes elements inherent in such process, method, article, or apparatus. In the absence of further limitations, an element limited by the phrase "comprises" does not exclude the presence of other similar elements in the process, method, article, or apparatus that includes the element.

[0014] (First embodiment) 1, an imaging optical lens 10 according to a 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, which are arranged in this order from the object side to the image 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] Conditional formula (1) specifies that the refractive index nd1 of the first lens L1 is 1.70 or more. In other words, it is preferable that the material of the first lens L1 is 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 imaging quality.

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

[0017] In this embodiment, a plurality of lenses (L1, L2, L3, L4, L5, L6) are provided, and the refractive index nd1 of the first lens L1 and the imaging optical lens 10 are set within the ranges specified by the above conditional expressions (1) and (2). As a result, the imaging optical lens 10 has excellent optical performance, and also has characteristics of a large aperture and compact size, 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, a composite focal length of the first lens L1 and the second lens L2 is f12, a 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] Conditional expression (4) specifies a proportional value between the composite focal length f12 of the first lens L1 and the second lens L2 and the focal length f of the imaging optical lens 10. When conditional expression (4) is satisfied, the amount of field curvature of the system (imaging optical lens 10) can be effectively balanced, and the amount of shift of the field curvature of the central field can be made smaller than 0.04 mm, so that 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 image 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 so 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 image-forming side surface of the third lens L3 satisfies the range specified by conditional expression (6), the degree of refraction of light when it passes through the third lens L3 can be reduced, and chromatic aberration can be effectively corrected to satisfy |LC|≦3.5 μm.

[0024] Preferably, the radius of curvature of the object side surface of the fourth lens L4 is R7, the radius of curvature of the image-forming 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 formula (7), by specifying the shape of the fourth lens L4 so that the proportional value of the radius of curvature R7 of the object side surface of the fourth lens L4 and the radius of curvature R8 of the image-forming side surface of the fourth lens L4 satisfies the range specified by conditional formula (7), it is possible to reduce the degree of refraction of light rays when they pass through the fourth lens L4, and therefore the imaging optical lens 10 has excellent imaging quality and low sensitivity.

[0026] Preferably, the thickness of the fifth lens L5 on the optical axis is d9, and the thickness of the sixth lens L6 on the optical axis is d11, satisfying the following conditional formula: 1.40≦d9 / d11≦5.00 (8)

[0027] Conditional formula (8) specifies a proportional value between the axial thickness d9 of the fifth lens L5 and the axial thickness d11 of the sixth lens L6. When conditional formula (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 reducing the difficulty of manufacturing the imaging optical lens 10.

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

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

[0030] Conditional formula (9) specifies the shape of the first lens L1, and when this conditional formula is satisfied, the degree of refraction when a light ray passes through the first lens L1 can be alleviated, so that aberration can be effectively reduced, and more preferably, 0.53≦(R1+R2) / (R1-R2)≦1.57 is satisfied. Conditional formula (10) specifies the proportional value between the focal length f1 of the first lens and the focal length f of the imaging optical lens 10, and when this conditional formula is satisfied, the optical performance of the imaging optical lens 10 can be improved, and more preferably, -2.21≦f1 / f≦-0.68 is satisfied. Conditional formula (11) specifies the proportional value between the thickness d1 on the optical axis of the first lens L1 and the total system length TTL of the imaging optical lens 10, and when this conditional formula is satisfied, the imaging optical lens 10 can be designed to be ultra-thin, and more preferably, 0.03≦d1 / TTL≦0.17 is satisfied.

[0031] In this embodiment, the object side surface of the second lens L2 near the optical axis is a concave surface, and the image side surface of the second lens L2 near the optical axis is a convex surface, and the second lens L2 has a positive refractive power. In any other embodiment, the object side surface and the image 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, a radius of curvature of the object side surface of the second lens L2 is R3, a radius of curvature of the image side surface of the second lens L2 is R4, a focal length of the second lens L2 is f2, a focal length of the imaging optical lens 10 is f, a thickness on the optical axis of the second lens L2 is d3, and a total system length of the imaging optical lens 10 is TTL, which satisfy the following relational expressions. 0.54≦(R3+R4) / (R3-R4)≦1.71 (12) 1.66≦f2 / f≦5.87 (13) 0.02≦d3 / TTL≦0.09 (14)

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

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

[0035] Preferably, a radius of curvature of the object side surface of the third lens L3 is R5, a radius of curvature of the image side surface of the third lens L3 is R6, a focal length of the third lens L3 is f3, a focal length of the imaging optical lens 10 is f, a thickness on the optical axis of the third lens L3 is d5, and a total system length of the imaging optical lens 10 is TTL, satisfying the following relational expressions. 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 the degree of refraction when a light ray passes through the third lens L3 can be alleviated, so that chromatic aberration can be effectively corrected and the chromatic aberration |LC|≦3.5 μm can be satisfied, more preferably, 0.07≦(R5+R6) / (R5-R6)≦0.80 can be satisfied. In conditional expression (16), the proportional value of the focal length f3 of the third lens L3 and the focal length f of the imaging optical lens 10 is specified, and when this conditional expression is satisfied, the aberration of the imaging optical lens 10 can be reduced, and the imaging optical lens 10 can be designed to be ultra-thin and have a wide angle of view, more preferably, -4.56≦f3 / f≦-1.95 can be satisfied. Conditional formula (17) specifies a proportional value between the thickness d5 of the third lens L3 on the optical axis and the total system length TTL of the imaging optical lens 10. When the above conditional formula is satisfied, the total system length TTL of the imaging optical lens 10 can be reasonably controlled and an ultra-thin design of the imaging optical lens 10 can be achieved. More preferably, the condition satisfies 0.03≦d5 / TTL≦0.09.

[0037] In this embodiment, the object side surface of the fourth lens L4 near the optical axis is a convex surface, and the image side surface of the fourth lens L4 near 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 image 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, a radius of curvature of the object side surface of the fourth lens L4 is R7, a radius of curvature of the image side surface of the fourth lens L4 is R8, a focal length of the fourth lens L4 is f4, a focal length of the imaging optical lens 10 is f, a thickness on the optical axis of the fourth lens L4 is d7, and a total system length of the imaging optical lens 10 is TTL, satisfying the following relational expressions. 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, and when the above conditional expression is satisfied, the degree of refraction when a light ray passes through the fourth lens L4 is alleviated, so that the imaging optical lens 10 can have excellent imaging quality and low sensitivity, and more preferably satisfies 0.00≦(R7+R8) / (R7−R8)≦0.72. In conditional expression (19), the proportional value of the focal length f4 of the fourth lens L4 and the focal length f of the imaging optical lens 10 is specified, and when the internal focal length of the imaging optical lens 10 is reasonably distributed, the imaging optical lens 10 can have excellent imaging quality and low sensitivity, and more preferably satisfies 0.98≦f4 / f≦2.15. Conditional formula (20) specifies a proportional value between the thickness d7 of the fourth lens L4 on the optical axis and the total system length TTL of the imaging optical lens 10. When this conditional formula is satisfied, the total system length TTL of the imaging optical lens 10 can be effectively compressed and an ultra-thin design of the imaging optical lens 10 can be achieved. More preferably, the conditional formula satisfies 0.05≦d7 / TTL≦0.21.

[0040] In this embodiment, the fifth lens L5 has a convex surface at the object side close to the optical axis, and a concave surface at the image side close to the optical axis, and the fifth lens L5 has a positive refractive power. In any other embodiment, the object side and image side of the fifth lens L5 may have other concave and convex distributions, and the fifth lens L5 may have a negative refractive power.

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

[0042] Conditional formula (21) specifies the shape of the fifth lens L5, and when this conditional formula is satisfied, the optical performance of the imaging optical lens 10 can be improved, and more preferably satisfies -10.96≦(R9+R10) / (R9-R10)≦-2.44. Conditional formula (22) specifies the proportional value between the focal length f5 of the fifth lens L5 and the focal length f of the imaging optical lens 10, and when this conditional formula is satisfied, the optical performance of the imaging optical lens 10 can be improved, and more preferably satisfies 7.01≦f5 / f≦36.48. Conditional formula (23) specifies the thickness d9 of the fifth lens L5 on the optical axis and the total system length TTL of the imaging optical lens 10, and the imaging optical lens 10 can be designed to be ultra-thin, and more preferably satisfies 0.10≦d9 / TTL≦0.29.

[0043] In this embodiment, the sixth lens L6 has a convex surface at the object side close to the optical axis, and a concave surface at the image side close to the optical axis, and the sixth lens L6 has a positive refractive power. In any other embodiment, the object side and image side of the sixth lens L6 may have other concave and convex distributions, and the sixth lens L6 may have a negative refractive power.

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

[0045] Conditional formula (24) specifies the shape of the sixth lens L6, and when this conditional formula is satisfied, it is possible to correct optical aberrations at off-axis angles of view occurring in the process of designing the imaging optical lens 10 to be ultra-thin and wide-angle, and more preferably satisfies -3.74≦(R11+R12) / (R11-R12)≦-1.87. Conditional formula (25) specifies the range of proportional values ​​between the focal length f6 of the sixth lens L6 and the focal length f of the imaging optical lens 10, and when this conditional formula is satisfied, the imaging optical lens 10 has excellent imaging quality and low sensitivity by rationally distributing the internal focal length of the imaging optical lens 10, and more preferably satisfies 1.48≦f6 / f≦3.49. Conditional formula (26) specifies the range of the proportional value between the thickness d11 of the sixth lens L6 on the optical axis and the total system length TTL of the imaging optical lens 10, making it possible to design an ultra-thin imaging optical lens 10, and more preferably satisfies 0.03≦d11 / TTL≦0.11.

[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] Conditional formula (27) specifies the F-number of the aperture of the imaging optical lens 10. When conditional formula (27) is satisfied, the imaging optical lens 10 can be designed to be compact and a larger amount of light can be allowed to enter. As a result, the measuring distance of the imaging optical lens 10 can be improved, the environmental light resistance of the imaging optical lens 10 can be improved, and it can be ensured that the imaging optical lens 10 has an excellent light receiving effect.

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

[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, and the optical filter GF may be a cover glass or an optical filter, and a first optical filter GF1 and a second optical filter GF2 are provided between the sixth lens L6 and the imaging surface Si as shown in Fig. 1. 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, and has a large aperture and small size, and has an excellent light receiving effect. Due 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 vehicle-mounted LIDAR.

[0051] The imaging optical lens 10 according to the present application will be described below with reference to examples. The symbols used in each example are as shown in Table 1. The focal length, the distance on the optical axis, the radius of curvature, the thickness on the optical axis, the position of the curvature point, and the position of the stationary point are all in mm.

[0052] TTL is the total optical length (the distance on the optical axis from the object side of the first lens L1 to the image plane Si) and is expressed in mm.

[0053] Preferably, the object side and / or image side of the lens may further be provided with curvature points and / or stationary points to meet high quality imaging requirements, and specific embodiments are described below.

[0054] 1 is a schematic diagram showing the structure of an imaging optical lens 10 according to a first embodiment. Design data for the imaging optical lens 10 according to the first embodiment of the present application is shown below.

[0055] Table 1 shows the radius of curvature R of the object side and image side surfaces 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 axial thickness of the lenses, the axial distance d between the lenses, the refractive index nd, and the Abbe number vd. Table 2 shows the conic coefficient k and aspheric 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, or central radius of curvature in the case of a lens S1: Aperture R1: Radius of curvature of the object side surface of the first lens L1 R2: Radius of curvature of the image-forming 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 imaging side 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 imaging side of the third lens L3 R7: Radius of curvature of the object side of the fourth lens L4 R8: Radius of curvature of the imaging side of the fourth lens L4 R9: Radius of curvature of the object side of the fifth lens L5 R10: Radius of curvature of the imaging side of the fifth lens L5 R11: Radius of curvature of the object side of the sixth lens L6 R12: Radius of curvature of the imaging side 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 imaging side 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 imaging side surface of the second optical filter GF2 d: Thickness of the lens on the optical axis, or distance between adjacent lenses on the optical axis d0: Distance on the optical axis from the aperture S1 to the object side of the first lens L1 d1: Thickness of the first lens L1 on the optical axis d2: the distance on the optical axis from the image-forming side surface of the first lens L1 to the object-side surface of the second lens L2 d3: Thickness of the second lens L2 on the optical axis d4: The distance on the optical axis from the image-forming side surface of the second lens L2 to the object-side surface of the third lens L3 d5: Thickness of the third lens L3 on the optical axis d6: the distance on the optical axis from the image-forming side surface of the third lens L3 to the object-side surface of the fourth lens L4 d7: Thickness of the fourth lens L4 on the optical axis d8: the distance on the optical axis from the image-forming side surface of the fourth lens L4 to the object-side surface of the fifth lens L5 d9: Thickness of the fifth lens L5 on the optical axis d10: the distance on the optical axis from the image-forming side surface of the fifth lens L5 to the object-side surface of the sixth lens L6 d11: Thickness of the sixth lens L6 on the optical axis d12: the distance on the optical axis from the image-forming side surface of the sixth lens L6 to the object-side surface of the first optical filter GF1 d13: Thickness of the first optical filter GF1 on the optical axis d14: the distance on the optical axis 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 of the second optical filter GF2 on the optical axis d16: the distance on the optical axis from the imaging side of the second optical filter GF2 to the imaging surface Si nd: Refractive index of d line (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 this embodiment, the aspheric surface of each lens is aspheric as shown in the following conditional formula (28). However, the specific aspect of the following conditional formula (28) is only one example, and the present application is not actually limited to the form of the aspheric polynomial expressed by the conditional formula (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 a conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, and A20 are aspheric coefficients, c is the curvature of the center of the optical surface, r is the perpendicular distance between a point on the aspheric curve and the optical axis, and z is the aspheric depth (the perpendicular distance between a point on the aspheric surface that is a distance r from the optical axis and a tangent plane that is tangent to the vertex on the aspheric optical axis).

[0061] Tables 3 and 4 show the design data of the curvature point and the stationary point of each lens in the imaging optical lens 10 according to the embodiment of the present application. Here, P1R1 and P1R2 respectively represent the object side surface and the image side surface of the first lens L1, P2R1 and P2R2 respectively represent the object side surface and the image side surface of the second lens L2, P3R1 and P3R2 respectively represent the object side surface and the image side surface of the third lens L3, P4R1 and P4R2 respectively represent the object side surface and the image side surface of the fourth lens L4, P5R1 and P5R2 respectively represent the object side surface and the image side surface of the fifth lens L5, and P6R1 and P6R2 respectively represent the object side surface and the image side surface of the sixth lens L6. 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 “stationary point position” column is the vertical distance from the stationary 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] Moreover, Table 25, which will be described later, shows values ​​corresponding to various parameters in the first embodiment and parameters specified by 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 magnification 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 axial 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 of the conditional expressions.

[0067] In this embodiment, the imaging optical lens 10 has an effective aperture of 2.237 mm, an image height in the full field of view of 3.300 mm, and a diagonal angle of view of 148.20°. The imaging optical lens 10 satisfies the characteristics of a large aperture and a small size, and has excellent optical characteristics with sufficiently corrected chromatic aberrations on and off the optical axis.

[0068] Second embodiment 5 is a schematic diagram showing the structure of an imaging optical lens 20 according to a second embodiment. The second embodiment is almost the same as the first embodiment, and the symbols have the same meanings as in the first embodiment, so only the differences will be listed below.

[0069] Tables 5 and 6 show design data for 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 stationary 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] Moreover, Table 25 described later further shows values ​​corresponding to various parameters and parameters specified by conditional expressions in the second embodiment.

[0076] Fig. 6 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 20 according to the second embodiment. Fig. 7 is a schematic diagram of the magnification 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 axial 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 of the conditional expressions.

[0078] In this 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 diagonal angle of view is 156.40°. The imaging optical lens 20 satisfies the characteristics of a large aperture and a small size, and has excellent optical characteristics with sufficient correction of chromatic aberration on and off the optical axis.

[0079] Third embodiment 9 is a schematic diagram showing the structure of an imaging optical lens 30 according to a third embodiment. The third embodiment is almost the same as the first embodiment, and the symbols have the same meanings as the first embodiment, so only the differences will be listed below.

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

[0081] Tables 9 and 10 show design data for 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 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] Moreover, Table 25 described later further shows values ​​corresponding to various parameters and parameters specified by conditional expressions in the third embodiment.

[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 magnification 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 axial 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 of the conditional expressions.

[0090] In this 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 diagonal angle of view is 115.88°. The imaging optical lens 30 satisfies the characteristics of a large aperture and a small size, and has excellent optical characteristics with sufficient correction of chromatic aberration on and off the optical axis.

[0091] (Fourth embodiment) 13 is a schematic diagram showing the structure of an imaging optical lens 40 according to a fourth embodiment. The fourth embodiment is almost the same as the first embodiment, and the symbols have the same meanings as in the first embodiment, so only the differences will be listed below.

[0092] Tables 13 and 14 show design data for 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 stationary 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] Moreover, Table 25 described later further shows values ​​corresponding to various parameters and parameters specified by conditional expressions in the fourth embodiment.

[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 magnification 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 of the conditional expressions.

[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 diagonal angle of view is 143.88°. The imaging optical lens 40 satisfies the characteristics of a large aperture and a small size, and has excellent optical characteristics with sufficient correction of chromatic aberration on and off the optical axis.

[0102] Fifth embodiment 17 is a schematic diagram showing the structure of an imaging optical lens 50 according to a fifth embodiment. The fifth embodiment is almost the same as the first embodiment, and the symbols have the same meanings as in the first embodiment, so only the differences will be listed below.

[0103] Tables 17 and 18 show design data for 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 stationary 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] Moreover, Table 25 described later further shows values ​​corresponding to various parameters and parameters specified by conditional expressions in the fifth embodiment.

[0110] Fig. 18 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 50 according to the fifth embodiment. Fig. 19 is a schematic diagram of the magnification 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 axial 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 of the conditional expressions.

[0112] In this 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 diagonal angle of view is 155.20°. The imaging optical lens 50 satisfies the characteristics of a large aperture and a small size, and has excellent optical characteristics, with its on-axis and off-axis chromatic aberrations being sufficiently corrected.

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

[0114] Tables 21 and 22 show design data for 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 stationary 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 astigmatism field curvature and distortion of light having 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 magnification chromatic aberration of light having 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 axial chromatic aberration of light having 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 values ​​corresponding to each conditional expression of the comparative embodiment according to the above conditions. It is clear that the imaging optical lens 60 according to the comparative embodiment does not satisfy the conditional expression nd1≧1.70.

[0122] In a comparative embodiment, the imaging optical lens 60 has an effective aperture of 2.463 mm, a full-field image height of 3.300 mm, and a diagonal angle of view of 133.90°. The imaging optical lens 60 does not have good optical characteristics, and its on-axis and off-axis chromatic aberrations are not sufficiently corrected.

[0123] [Table 25]

[0124] The imaging optical lenses according to the embodiments of the present application have been described in detail above, and the principles and embodiments of the present application have been described in this specification using specific examples. However, the above description of the embodiments is merely intended to facilitate understanding of the ideas of the present application, and specific examples and scope of application may be changed. In short, the contents of this specification should not be construed as limiting the present application.

Claims

1. 1. An imaging optical lens, comprising: The optical system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, which are arranged in order from the object side to the image 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; the image height of the imaging optical lens is IH, nd1≧1.70 (FOV×f) / IH≧120.00 Satisfying the above condition Imaging optical lens.

2. 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 Satisfying the above condition The imaging optical lens of claim 1 .

3. 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 Satisfying the above condition The imaging optical lens of claim 1 .

4. The fifth lens has an axial thickness of d9, The sixth lens has an axial thickness of d11, 1.40≦d9 / d11≦5.00 Satisfying the above condition The imaging optical lens of claim 1 .

5. a composite focal length of the first lens and the second lens is f12; -6.00≦f12 / f≦-1.20 Satisfying the above condition The imaging optical lens of claim 1 .

6. The field angle FOV and focal length f of the imaging optical lens are (FOV×f) / IH≦150.00 Further satisfying the above relation, The imaging optical lens of claim 1 .

7. the first lens has a negative refractive power; a portion of the image forming side surface of the first lens that is 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 Satisfying the above relation, The imaging optical lens of claim 1 .

8. the second lens has a positive refractive power; a portion of the object side surface of the second lens that is close to the optical axis is concave, a portion of the image-forming 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; 0.54≦(R3+R4) / (R3-R4)≦1.71 1.66≦f2 / f≦5.87 0.02≦d3 / TTL≦0.09 Satisfying the above relation, The imaging optical lens of claim 1 .

9. the third lens has a negative refractive power; a portion of the object side surface of the third lens that is close to the optical axis is concave, a portion of the image forming 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; 0.05≦(R5+R6) / (R5-R6)≦1.00 −7.30≦f3 / f≦−1.56 0.02≦d5 / TTL≦0.12 Satisfying the above relation, The imaging optical lens of claim 1 .

10. the fourth lens has a positive refractive power, a portion of the object side surface of the fourth lens that is close to the optical axis is a convex surface, 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 Satisfying the above relation, The imaging optical lens of claim 1 .

11. the fifth lens has a positive refractive power, 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; -17.54≦(R9+R10) / (R9-R10)≦-1.95 4.38≦f5 / f≦45.60 0.06≦d9 / TTL≦0.36 Satisfying the above relation, The imaging optical lens of claim 1 .

12. the sixth lens has a positive refractive power, a portion of the sixth lens on an object side surface 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 Satisfying the above relation, The imaging optical lens of claim 1 .

13. The fourth lens is made of a glass material. The imaging optical lens of claim 1 .

Images