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, a sixth lens, a seventh lens, and an eighth lens arranged in order from the object side to the image side. The thicknesses on the optical axis of the first lens and the second lens are d1 and d3, respectively, the radii of curvature of the object side surface and the image side surface of the second lens are R3 and R4, respectively, the focal lengths of the third lens, the fourth lens, the sixth lens, and the seventh lens are f3, f4, f6, and f7, respectively, and the refractive index of the eighth lens is nd8, and the following relations are satisfied: 1.00≦d3 / d1≦3.00, 0.20≦R3 / R4≦0.90, 1.00≦f4 / f3≦4.00, 0.50≦f6 / f7≦1.40, and 1.80≦nd8≦2.20. The imaging optical lens of the present application has excellent optical performance, and has the characteristics of a large aperture and a small size.

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] Lidar (Light Detection and Ranging) is a radar system that detects the position, speed and other characteristics of a target by emitting a laser beam. It is also a system that integrates laser, Global Positioning System (GPS) and Inertial Navigation System (INS) technologies, and acquires data to generate an accurate terrestrial digital elevation model (DEM). The basic working principle of Lidar is that after transmitting a detection signal (laser beam) to the target, the received signal (target echo) reflected by the target is compared with the transmitted signal, and after proper processing, the relevant information of the target, such as the target's distance, azimuth, altitude, speed, attitude, uniform shape and other parameters, can be obtained and used to detect, track and identify targets, including aircraft and missiles. The sensor emits tens or hundreds of thousands of laser pulses per second, and when a light pulse is emitted, a timer is started, and when the light pulse (reflected from the first person / object) returns, the timer is stopped, and the distance between the sensor and the person / object is calculated by measuring the time of flight (TOF) of the light pulse.

[0003] Although the lenses installed in conventional vehicle-mounted LIDAR already have good optical performance, there are still certain irrationalities in terms of the setting of the lens focal length, etc., so the lens structure cannot have good optical performance while meeting the design requirements of large diameter and small size. 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 and can satisfy design requirements for a large aperture and compact size.

[0005] In order to solve the above technical problems, according to the present application, there is provided a zoom lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in order from an object side to an image side, the first lens having an optical axis thickness of d1, the second lens having an optical axis thickness of d3, the second lens having an object side surface thickness of R3, the second lens having an image side surface thickness of R4, and the third lens having an optical axis thickness of d5. the focal length of the fourth lens is f3, the focal length of the sixth lens is f4, the focal length of the seventh lens is f6, the focal length of the seventh lens is f7, and the refractive index of the eighth lens is nd8, and the imaging optical lens which satisfies the above relational expressions: 1.00≦d3 / d1≦3.00, 0.20≦R3 / R4≦0.90, 1.00≦f4 / f3≦4.00, 0.50≦f6 / f7≦1.40, 1.80≦nd8≦2.20.

[0006] According to the present application, the following effects can be obtained: The imaging optical lens of the present application has excellent optical performance, and has a large aperture and compact characteristics, and is particularly applicable to mobile imaging lens assemblies, WEB imaging lenses, and vehicle-mounted lidar lenses that are configured with imaging elements such as CCDs and CMOSs ​​for high pixel counts. [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. 2 is a schematic diagram showing the structure of an imaging optical lens according to a comparative 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. 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, a sixth lens L6, a seventh lens L7, and an eighth lens L8, which are arranged in order from the object side to the image side. The thickness of the first lens L1 on the optical axis is d1, the thickness of the second lens L2 on the optical axis is d3, the radius of curvature of the object side surface of the second lens L2 is R3, the radius of curvature of the image side surface of the second lens L2 is R4, the focal length of the third lens L3 is f3, the focal length of the fourth lens L4 is f4, the focal length of the sixth lens L6 is f6, the focal length of the seventh lens L7 is f7, and the refractive index of the eighth lens L8 is nd8, which satisfy the following relational expressions. 1.00≦d3 / d1≦3.00 (1) 0.20≦R3 / R4≦0.90 (2) 1.00≦f4 / f3≦4.00 (3) 0.50≦f6 / f7≦1.40 (4) 1.80≦nd8≦2.20 (5)

[0015] In conditional formula (1), a proportional value between the thickness d3 on the optical axis of the second lens L2 and the thickness d1 on the optical axis of the first lens L1 is specified. Setting the proportional value within the range specified by conditional formula (1) makes it possible to compress the total system length TTL of the imaging optical lens 10, and to reduce the size of the imaging optical lens 10.

[0016] Conditional formula (2) specifies the shape of the second lens L2. When conditional formula (2) is satisfied, the degree of refraction of light when it passes through the second lens L2 can be mitigated, and chromatic aberration can be effectively corrected to be |LC|≦6.0 μm.

[0017] In conditional formula (3), a proportional value between the focal length f4 of the fourth lens L4 and the focal length f3 of the third lens L3 is specified. By setting the proportional value within the range specified by conditional formula (3) and rationally distributing the optical focal lengths of the imaging optical lens 10, the imaging optical lens 10 has excellent imaging quality and low sensitivity.

[0018] Conditional expression (4) specifies a proportional value between the focal length f6 of the sixth lens L6 and the focal length f7 of the seventh lens L7. As can be seen from the range specified by conditional expression (4), the focal length f6 of the sixth lens L6 and the focal length f7 of the seventh lens L7 are relatively close, so that light rays can pass through the sixth lens L6 and the seventh lens L7 gently, thereby improving the imaging quality of the imaging optical lens 10.

[0019] In the conditional formula (5), the refractive index nd8 of the eighth lens L8 is specified, and as can be seen from this, the eighth lens L8 is made of a material with a high refractive index. In this way, the diameter of the rear end (imaging side) of the imaging optical lens 10 can be reduced, and the imaging quality of the imaging optical lens 10 can be improved.

[0020] In this embodiment, a plurality of lenses (L1, L2, L3, L4, L5, L6, L7, L8) are provided, and a proportional value between the thickness d3 of the second lens L2 and the thickness d1 of the first lens L1, a shape of the second lens L2, a proportional value between the focal length f3 of the third lens L3 and the focal length f4 of the fourth lens L4, a proportional value between the focal length f6 of the sixth lens L6 and the focal length f7 of the seventh lens L7, and a refractive index nd8 of the eighth lens L8 are set. As a result, the imaging optical lens 10 has excellent optical performance and also has characteristics of a large aperture and compact size, and can be particularly adapted to a mobile imaging lens assembly, a WEB imaging lens, and an in-vehicle lidar lens constituted by imaging elements such as a high-pixel CCD or CMOS.

[0021] Preferably, the focal length of the eighth lens L8 is f8, and the focal length of the imaging optical lens 10 is f, satisfying the following relation: |f8 / f|≦3.00 (6)

[0022] Conditional formula (6) specifies the focal length f8 of the eighth lens L8. As can be seen from this, since the focal length f8 of the eighth lens L8 is short, the light-gathering ability of the imaging optical lens 10 can be improved and a sufficient luminous flux can be secured, the chief ray angle (CRA) can be reduced, and the relative illuminance of the imaging optical lens 10 can be improved.

[0023] Preferably, 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, which satisfy the following relational expression: (FOV×f) / IH≧95 (7)

[0024] When conditional expression (7) is satisfied, the imaging optical lens 10 can achieve both a good angle of view and telephoto capability, and can realize imaging at medium to long distances.

[0025] Preferably, the imaging optical lens 10 further satisfies the following relationship: (FOV×f) / IH≦125 (8)

[0026] In this embodiment, the object side surface of the first lens L1 near the optical axis is concave, and the image side surface of the first lens L1 near the optical axis is concave, 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 have other concave and convex distributions.

[0027] Preferably, a radius of curvature of an object side surface of the first lens L1 is R1, a radius of curvature of an 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 is f, and a total system length of the imaging optical lens 10 is TTL, and the following relational expressions are satisfied: 0.44≦(R1+R2) / (R1-R2)≦5.87 (9) -7.27≦f1 / f≦-0.83 (10) 0.01≦d1 / TTL≦0.05 (11)

[0028] Conditional formula (9) specifies the shape of the first lens L1, and when this conditional formula is satisfied, the imaging quality of the imaging optical lens can be improved, and more preferably satisfies 0.70≦(R1+R2) / (R1-R2)≦4.70. Conditional formula (10) specifies a proportional value between the focal length f1 of the first lens L1 and the focal length of the imaging optical lens f, and when this conditional formula is satisfied, the optical performance of the imaging optical lens can be improved, and more preferably satisfies −4.55≦f1 / f≦−1.04. Conditional formula (11) specifies a proportional value between the thickness d1 of the first lens L1 on the optical axis and the total system length TTL of the imaging optical lens, and when this conditional formula is satisfied, an ultra-thin design can be achieved, and more preferably satisfies 0.01≦d1 / TTL≦0.04.

[0029] In this embodiment, the object side surface of the second lens L2 near the optical axis is a convex surface, and the image side surface of the second lens L2 near the optical axis is a concave 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.

[0030] Preferably, the focal length of the second lens L2 is f2, the focal length of the imaging optical lens is f, and the total system length of the imaging optical lens is TTL, satisfying the following relational expression: -34.47≦(R3+R4) / (R3-R4)≦-1.01 (12) 3.18≦f2 / f≦17.23 (13) 0.01≦d3 / TTL≦0.08 (14)

[0031] Conditional formula (12) specifies the shape of the second lens L2, and when this conditional formula is satisfied, it is possible to correct axial chromatic aberration of the imaging optical lens 10, and more preferably satisfies -21.54≦(R3+R4) / (R3-R4)≦-1.26. Conditional formula (13) specifies the range of the proportional value between the focal length f2 of the second lens L2 and the focal length f of the imaging optical lens, and when this conditional formula is satisfied, the second lens L2 has an appropriate positive refractive power, and it is possible to design the imaging optical lens 10 to be ultra-thin and have a wide angle of view, and more preferably satisfies 5.09≦f2 / f≦13.78. 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 this conditional expression is satisfied, the imaging optical lens 10 can be designed to be extremely thin, and more preferably, 0.02≦d3 / TTL≦0.07 is satisfied.

[0032] In this embodiment, the object side surface of the third lens L3 near the optical axis is a convex surface, and the image side surface of the third lens L3 near the optical axis is a convex surface, and the third lens L3 has a positive 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 a negative refractive power.

[0033] 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 imaging optical lens 10 is f, an axial thickness of the third lens L3 is d5, and a total system length of the imaging optical lens 10 is TTL, which satisfy the following relational expressions: 0.01≦(R5+R6) / (R5-R6)≦0.62 (15) 0.47≦f3 / f≦2.47 (16) 0.03≦d5 / TTL≦0.22 (17)

[0034] Conditional formula (15) specifies the shape of the third lens L3, and when this conditional formula is satisfied, the imaging quality can be improved, and more preferably satisfies 0.02≦(R5+R6) / (R5-R6)≦0.49. Conditional formula (16) specifies the range of the proportional value between the focal length f3 of the third lens L3 and the focal length f of the imaging optical lens 10, and when this conditional formula is satisfied, the aberration can be reduced, and more preferably satisfies 0.75≦f3 / f≦1.97. Conditional formula (17) specifies the range of the 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, and when this conditional formula is satisfied, the imaging optical lens 10 can be designed to be ultra-thin, and more preferably satisfies 0.05≦d5 / TTL≦0.17.

[0035] 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.

[0036] 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 imaging optical lens L4 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, which satisfy the following relational expressions: -1.98≦(R7+R8) / (R7-R8)≦1.12 (18) 0.76≦f4 / f≦5.61 (19) 0.01≦d7 / TTL≦0.23 (20)

[0037] Conditional formula (18) specifies the shape of the fourth lens L4, and when this conditional formula is satisfied, the imaging optical lens 10 can be made ultra-thin and have a wide angle of view, and axial chromatic aberration can be corrected, and more preferably, -1.24≦(R7+R8) / (R7−R8)≦0.89 is satisfied. Conditional formula (19) specifies the range of the proportional value between the focal length f4 of the fourth lens L4 and the focal length f of the imaging optical lens 10, and when this conditional formula is satisfied, the aberration can be reduced and the imaging quality can be improved, and more preferably, 1.22≦f4 / f≦4.49 is satisfied. Conditional formula (20) specifies the 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, and when this conditional formula is satisfied, the imaging optical lens 10 can be made ultra-thin, and more preferably, 0.01≦d7 / TTL≦0.19 is satisfied.

[0038] In this embodiment, the fifth lens L5 has a concave surface at a portion close to the optical axis on the object side surface, and a concave surface at a portion close to the optical axis on the image side surface, and the fifth lens L5 has a negative refractive power. In any other embodiment, the object side surface and the image side surface of the fifth lens L5 may have other concave and convex distributions, and the fifth lens L5 may have a positive refractive power.

[0039] 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 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: -0.99≦(R9+R10) / (R9-R10)≦1.45 (21) -3.48≦f5 / f≦-0.45 (22) 0.00≦d9 / TTL≦0.28 (23)

[0040] Conditional formula (21) specifies the shape of the fifth lens L5, and when this conditional formula is satisfied, the fifth lens L5 can effectively correct the spherical aberration of the system (imaging optical lens 10), and more preferably satisfies -0.62≦(R9+R10) / (R9-R10)≦1.16. 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 -2.17≦f5 / f≦-0.56. Conditional formula (23) specifies the proportional value between 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 when this conditional formula is satisfied, the total system length TTL of the imaging optical lens 10 can be compressed, and more preferably satisfies 0.01≦d9 / TTL≦0.22.

[0041] In this embodiment, the sixth lens L6 has a convex surface at a portion close to the optical axis on the object side surface, and a convex surface at a portion close to the optical axis on the image side surface, and the sixth lens L6 has a positive refractive power. In any other embodiment, the sixth lens L6 may have a negative refractive power, and the object side surface and the image side surface of the sixth lens L6 may have other concave and convex distributions.

[0042] 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 imaging optical lens 10 is f, an axial thickness 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: -2.00≦(R11+R12) / (R11-R12)≦0.22 (24) 1.00≦f6 / f≦5.66 (25) 0.01≦d11 / TTL≦0.14 (26)

[0043] Conditional formula (24) specifies the shape of the sixth lens L6, and when this conditional formula is satisfied, the degree of refraction when light passes through the lens can be alleviated, so that aberration can be effectively reduced, and more preferably, -1.25≦(R11+R12) / (R11-R12)≦0.17 is satisfied. Conditional formula (25) specifies the proportional value 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, aberration can be reduced and imaging quality can be improved, and more preferably, 1.61≦f6 / f≦4.53 is satisfied. Conditional formula (26) specifies the proportional value between the thickness d11 of the sixth lens on the optical axis and the total system length TTL of the imaging optical lens, and the total system length TTL of the imaging optical lens can be compressed, and an ultra-thin design of the imaging optical lens 10 can be achieved, and more preferably, 0.02≦d11 / TTL≦0.11 is satisfied.

[0044] In this embodiment, the seventh lens L7 has a convex surface at the object side close to the optical axis, and a convex surface at the image side close to the optical axis, and the seventh lens L7 has a positive refractive power. In any other embodiment, the seventh lens L7 may have a negative refractive power, and the object side and image side of the seventh lens L7 may have other concave and convex distributions.

[0045] Preferably, a radius of curvature of the object side surface of the seventh lens L7 is R13, a radius of curvature of the image side surface of the seventh lens L7 is R14, a focal length of the imaging optical lens 10 is f, an axial thickness of the seventh lens L7 is d13, and a total system length of the imaging optical lens 10 is TTL, which satisfy the following relational expressions: -11.16≦(R13+R14) / (R13-R14)≦-0.01 (27) 0.89≦f7 / f≦10.88 (28) 0.01≦d13 / TTL≦0.30 (29)

[0046] Conditional formula (27) specifies the shape of the seventh lens L7, and when this conditional formula is satisfied, the degree of refraction when a light ray passes through the seventh lens L7 can be mitigated, so that aberration can be effectively reduced, and more preferably, -6.98≦(R13+R14) / (R13-R14)≦-0.01 is satisfied. Conditional formula (28) specifies the range of the proportional value between the focal length f7 of the seventh lens L7 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, 1.43≦f7 / f≦8.71 is satisfied. Conditional expression (29) specifies a proportional value between the thickness d13 of the seventh lens L7 on the optical axis and the total system length TTL of the imaging optical lens 10. When the above conditional expression is satisfied, the imaging optical lens 10 can be designed to be ultra-thin, and more preferably satisfies 0.02≦d13 / TTL≦0.24.

[0047] In this embodiment, the portion of the object side surface of the eighth lens L8 close to the optical axis is concave, and the portion of the image side surface of the eighth lens L8 close to the optical axis is concave, and the eighth lens L8 has negative refractive power. In any other embodiment, the eighth lens L8 may have positive refractive power, and the object side surface and the image side surface of the eighth lens L8 may be provided with other concave and convex distributions.

[0048] Preferably, the radius of curvature of the object side surface of the eighth lens L8 is R15, the radius of curvature of the image side surface of the eighth lens L8 is R16, the thickness on the optical axis of the eighth lens L8 is d15, and the total system length of the imaging optical lens 10 is TTL, satisfying the following relational expressions: -12.5≦(R15+R16) / (R15-R16)≦0.02 (30) 0.01≦d15 / TTL≦0.05 (31)

[0049] Conditional formula (30) specifies the shape of the eighth lens L8, and when this conditional formula is satisfied, in the case where the imaging optical lens 10 is designed to be ultra-thin and have a wide angle of view, axial chromatic aberration can be corrected, and more preferably, -7.81≦(R15+R16) / (R15-R16)≦0.01 is satisfied. Conditional formula (31) specifies the proportional value between the axial thickness d15 of the eighth lens L8 and the total system length TTL of the imaging optical lens 10, and when this conditional formula is satisfied, the total system length TTL of the imaging optical lens 10 can be reasonably controlled, and more preferably, 0.01≦d15 / TTL≦0.04 is satisfied.

[0050] Preferably, the F-number FNO of the imaging optical lens 10 satisfies the following relation: FNO≦1.65 (32)

[0051] Conditional formula (32) specifies the F-number of the aperture of the imaging optical lens 10. If conditional formula (32) is satisfied, the imaging optical lens 10 can be designed to be compact, and a larger amount of light can enter the lens.

[0052] In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are all made of glass material. In other preferred embodiments, each lens may be made of other materials.

[0053] Preferably, the first lens L1 is a spherical lens, the second lens L2 is a spherical lens, the third lens L3 is an aspheric lens, the fourth lens L4 is a spherical lens, the fifth lens L5 is a spherical lens, the sixth lens L6 is an aspheric lens, the seventh lens L7 is a spherical lens, and the eighth lens L8 is a spherical lens.

[0054] In this embodiment, an optical element such as an optical filter GF is provided between the eighth lens L8 and the image forming surface Si, and the optical filter GF may be a cover glass or an optical filter, and the optical filter GF is provided between the eighth lens L8 and the image forming surface Si as shown in Fig. 1. In other embodiments, the optical filter GF may be provided at other positions.

[0055] The imaging optical lens 10 of the present application has excellent optical performance, and also has the characteristics of a large aperture and compact size, and is particularly applicable to mobile imaging lens assemblies, WEB imaging lenses, and in-vehicle lidar lenses constituted by imaging elements such as high-pixel CCDs and CMOSs.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] Table 1 shows the radius of curvature R of the object side and image side surfaces of the first lens L1 to the eighth lens L8 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. Note that in this embodiment, the units of distance, radius, and thickness are all mm.

[0061] [Table 1]

[0062] 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 R13: Radius of curvature of the object side surface of the seventh lens L7 R14: Radius of curvature of the imaging side of the seventh lens L7 R15: Radius of curvature of the object side of the eighth lens L8 R16: Radius of curvature of the imaging side of the eighth lens L8 R17: Radius of curvature of the object side of the optical filter GF R18: Radius of curvature of the imaging side of the optical filter GF 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 seventh lens L7 d13: Thickness of the seventh lens L7 on the optical axis d14: the distance on the optical axis from the image-forming side surface of the seventh lens L7 to the object-side surface of the eighth lens L8 d15: Thickness of the eighth lens L8 on the optical axis d16: the distance on the optical axis from the image-forming side of the eighth lens L8 to the object side of the optical filter GF d17: Thickness of the optical filter GF on the optical axis d18: Distance on the optical axis from the imaging side of the optical filter GF 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 nd7: Refractive index of the seventh lens L7 nd8: Refractive index of the eighth lens L8 ndg: Refractive index of the optical filter GF 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 vd7: Abbe number of the seventh lens L7 vd8: Abbe number of the 8th lens L8 vg: Abbe number of the optical filter GF

[0063] [Table 2]

[0064] In this embodiment, the aspheric surface of each lens is aspheric as shown in the following conditional expression (33). However, the specific embodiment of the following conditional expression (33) is only one example, and the present application is not actually limited to the form of the aspheric polynomial expressed by the conditional expression (33). z=(c 2 / r) / {1+[1-(k+1)(c 2 / r 2 )] 1 / 2}+A4c 4 +A6c 6 +A8c8 +A10c 10 +A12c 12 +A14c 14 +A16c 16 +A18c 18 +A20c 20 (33)

[0065] 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).

[0066] Tables 3 and 4 show the design data of the curvature points and stationary points of each lens in the imaging optical lens 10 according to an embodiment of the present application. Here, P1R1 and P1R2 represent the object side and image side surfaces of the first lens L1, P2R1 and P2R2 represent the object side and image side surfaces of the second lens L2, P3R1 and P3R2 represent the object side and image side surfaces of the third lens L3, P4R1 and P4R2 represent the object side and image side surfaces of the fourth lens L4, P5R1 and P5R2 represent the object side and image side surfaces of the fifth lens L5, P6R1 and P6R2 represent the object side and image side surfaces of the sixth lens L6, P7R1 and P7R2 represent the object side and image side surfaces of the seventh lens L7, and P8R1 and P8R2 represent the object side and image side surfaces of the eighth lens L8. The data corresponding to the "curvature point position" column is the vertical distance from a 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 a stationary point provided on the surface of each lens to the optical axis of the imaging optical lens 10.

[0067] [Table 3] [Table 4]

[0068] Moreover, Table 21 described later further shows values ​​corresponding to various parameters in the first embodiment and parameters specified by conditional expressions.

[0069] Fig. 2 is a schematic diagram of the field curvature and distortion aberration of light having a wavelength of 555 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 having wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 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 having wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm after passing through the imaging optical lens 10 according to the first embodiment.

[0070] As shown in Table 21, the first embodiment satisfies each of the conditional expressions.

[0071] In this embodiment, the imaging optical lens 10 has an effective aperture of 3.613 mm, an image height in the full field of view of 5.139 mm, and a diagonal angle of view of 107.40°. The imaging optical lens 10 satisfies the design requirements for a large aperture and compact size, and has excellent optical performance with sufficiently corrected chromatic aberrations on and off the optical axis.

[0072] 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.

[0073] In this embodiment, the seventh lens L7 has a concave surface on its imaging side close to the optical axis, and the eighth lens L8 has a convex surface on its imaging side close to the optical axis.

[0074] Tables 5 and 6 show design data for the imaging optical lens 20 according to the second embodiment of the present application.

[0075] [Table 5]

[0076] [Table 6]

[0077] 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.

[0078] [Table 7] [Table 8]

[0079] Moreover, Table 21 described later further shows values ​​corresponding to various parameters and parameters specified by conditional expressions in the second embodiment.

[0080] Fig. 6 is a schematic diagram of the field curvature and distortion aberration of light having a wavelength of 555 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 having wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 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 having wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm after passing through the imaging optical lens 20 according to the second embodiment.

[0081] As shown in Table 21, the second embodiment satisfies each of the conditional expressions.

[0082] In this embodiment, the imaging optical lens 20 has an effective aperture of 4.675 mm, an image height in the full field of view of 5.139 mm, and a diagonal angle of view of 77.60°. The imaging optical lens 20 satisfies the design requirements for a large aperture and compact size, and has excellent optical performance with sufficiently corrected chromatic aberrations on and off the optical axis.

[0083] 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.

[0084] In this embodiment, the portion of the object side surface of the first lens L1 close to the optical axis is a convex surface, the portion of the imaging side surface of the sixth lens L6 close to the optical axis is a concave surface, the portion of the imaging side surface of the seventh lens L7 close to the optical axis is a concave surface, and the portion of the imaging side surface of the eighth lens L8 close to the optical axis is a convex surface.

[0085] Tables 9 and 10 show design data for the imaging optical lens 30 according to the third embodiment of the present application.

[0086] [Table 9]

[0087] [Table 10]

[0088] 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.

[0089] [Table 11]

[0090] [Table 12]

[0091] Moreover, Table 21, which will be described later, further shows values ​​corresponding to various parameters in the third embodiment and parameters specified by conditional expressions.

[0092] Fig. 10 is a schematic diagram of the field curvature and distortion aberration of light having a wavelength of 555 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 having wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 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 having wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm after passing through the imaging optical lens 30 according to the third embodiment.

[0093] As shown in Table 21, the third embodiment satisfies each of the conditional expressions.

[0094] In this embodiment, the imaging optical lens 30 has an effective aperture of 4.482 mm, an image height in the full field of view of 5.139 mm, and a diagonal angle of view of 72.88°. The imaging optical lens 30 satisfies the design requirements for a large aperture and compact size, and has excellent optical performance with sufficiently corrected chromatic aberrations on and off the optical axis.

[0095] (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.

[0096] In this embodiment, the portion of the object side surface of the first lens L1 close to the optical axis is a convex surface, the portion of the image-forming side surface of the seventh lens L7 close to the optical axis is a concave surface, and the portion of the image-forming side surface of the eighth lens L8 close to the optical axis is a convex surface.

[0097] Tables 13 and 14 show design data for the imaging optical lens 40 according to the fourth embodiment of the present application.

[0098] [Table 13]

[0099] [Table 14]

[0100] 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.

[0101] [Table 15]

[0102] [Table 16]

[0103] Moreover, Table 21, which will be described later, further shows values ​​corresponding to various parameters in the fourth embodiment and parameters specified by conditional expressions.

[0104] Fig. 14 is a schematic diagram of the field curvature and distortion aberration of light having a wavelength of 555 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 having wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 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 having wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm after passing through the imaging optical lens 40 according to the fourth embodiment.

[0105] As shown in Table 21, the fourth embodiment satisfies each of the conditional expressions.

[0106] In this embodiment, the imaging optical lens 40 has an effective aperture of 6.915 mm, an image height in the full field of view of 5.139 mm, and a diagonal angle of view of 43.13°. The imaging optical lens 40 satisfies the design requirements for a large aperture and compact size, and has excellent optical performance with sufficiently corrected chromatic aberrations on and off the optical axis.

[0107] (Comparative embodiment) 17 is a schematic diagram showing the structure of an imaging optical lens 50 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.

[0108] Tables 17 and 18 show design data for the imaging optical lens 50 according to the comparative embodiment.

[0109] [Table 17]

[0110] [Table 18]

[0111] 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 comparative embodiment.

[0112] [Table 19]

[0113] [Table 20]

[0114] Fig. 18 is a schematic diagram of the field curvature and distortion aberration of light having a wavelength of 555 nm after passing through the imaging optical lens 50 according to the comparative embodiment. Fig. 19 is a schematic diagram of the magnification chromatic aberration of light having wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm after passing through the imaging optical lens 50 according to the comparative embodiment. Fig. 20 is a schematic diagram of the axial chromatic aberration of light having wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm after passing through the imaging optical lens 50 according to the comparative embodiment.

[0115] Table 21, which will be described later, further shows the values ​​of each parameter in the comparative embodiment and the parameters specified in the conditional formula. Apparently, the imaging optical lens 50 according to the comparative embodiment does not satisfy the conditional formula of 0.20≦R3 / R4≦0.90.

[0116] In a comparative embodiment, the imaging optical lens 50 has an effective aperture of 6.283 mm, a full-field image height of 5.139 mm, and a diagonal angle of view of 54.89°. The imaging optical lens 50 does not have excellent optical performance, and its on-axis and off-axis chromatic aberrations are not sufficiently corrected.

[0117] [Table 21]

[0118] 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. A lens structure comprising: The lens structure is arranged in order from the object side to the image forming side, The optical system is composed of a first lens having negative refractive power, a second lens having positive refractive power, a third lens having positive refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, a seventh lens having positive refractive power, and an eighth lens having negative refractive power, The thickness of the first lens on the optical axis is d1, The thickness of the second lens on the optical axis is d3, 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 third lens is f3, The focal length of the fourth lens is f4, The sixth lens has a focal length of f6. The seventh lens has a focal length of f7. The refractive index of the eighth lens is nd8, a portion of the seventh lens on the object side close to the optical axis is a convex surface, The radius of curvature of the object side surface of the seventh lens is R13, The seventh lens has a radius of curvature of an image-forming side surface of R14. the focal length of the imaging optical lens is f; The seventh lens has an axial thickness of d13, the total system length of the imaging optical lens is TTL; 1.00≦d3 / d1≦3.00 0.20≦R3 / R4≦0.90 1.00≦f4 / f3≦4.00 0.50≦f6 / f7≦1.40 1.80≦nd8≦2.20 -11.16≦(R13+R14) / (R13-R14)≦-0.01 0.89≦f7 / f≦10.88 0.01≦d13 / TTL≦0.30 Satisfying the above relation, Imaging optical lens.

2. The focal length of the eighth lens is f8; the focal length of the imaging optical lens is f; |f8 / f|≦3.00 Satisfying the above relation, The imaging optical lens of claim 1 .

3. 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, (FOV×f) / IH≧95 Satisfying the above relation, The imaging optical lens of claim 1 .

4. (FOV×f) / IH≦125 Further satisfying the above relation, The imaging optical lens according to claim 3 .

5. 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 focal length of the imaging optical lens is f; the total system length of the imaging optical lens is TTL; 0.44≦(R1+R2) / (R1-R2)≦5.87 −7.27≦f1 / f≦−0.83 0.01≦d1 / TTL≦0.05 Satisfying the above relation, The imaging optical lens of claim 1 .

6. The portion of the object side surface of the second lens close to the optical axis is a convex surface, a portion of the image forming side surface of the second lens that is close to the optical axis is concave; The focal length of the second lens is f2, the focal length of the imaging optical lens is f; the total system length of the imaging optical lens is TTL; -34.47≦(R3+R4) / (R3-R4)≦-1.01 3.18≦f2 / f≦17.23 0.01≦d3 / TTL≦0.08 Satisfying the above relation, The imaging optical lens of claim 1 .

7. The portion of the object side surface of the third lens close to the optical axis is a convex surface, a portion of the image-forming side surface of the third lens that is close to the optical axis is a convex surface, 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 imaging optical lens is f; The thickness of the third lens on the optical axis is d5, the total system length of the imaging optical lens is TTL; 0.01≦(R5+R6) / (R5-R6)≦0.62 0.47≦f3 / f≦2.47 0.03≦d5 / TTL≦0.22 Satisfying the above relation, The imaging optical lens of claim 1 .

8. The portion of the object side surface of the fourth lens 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 imaging optical lens is f; The thickness of the fourth lens on the optical axis is d7, the total system length of the imaging optical lens is TTL; -1.98≦(R7+R8) / (R7-R8)≦1.12 0.76≦f4 / f≦5.61 0.01≦d7 / TTL≦0.23 Satisfying the above relation, The imaging optical lens of claim 1 .

9. The portion of the object side surface of the fifth lens close to the optical axis is concave, 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 focal length of the imaging optical lens is f; The fifth lens has an axial thickness of d9, the total system length of the imaging optical lens is TTL; -0.99≦(R9+R10) / (R9-R10)≦1.45 −3.48≦f5 / f≦−0.45 0.00≦d9 / TTL≦0.28 Satisfying the above relation, The imaging optical lens of claim 1 .

10. The sixth lens has a convex surface at a portion close to the optical axis of the object side surface, 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 focal length of the imaging optical lens is f; The sixth lens has an axial thickness of d11, the total system length of the imaging optical lens is TTL; -2.00≦(R11+R12) / (R11-R12)≦0.22 1.00≦f6 / f≦5.66 0.01≦d11 / TTL≦0.14 Satisfying the above relation, The imaging optical lens of claim 1 .

11. A portion of the object side surface of the eighth lens close to the optical axis is concave, The radius of curvature of the object side surface of the eighth lens is R15, The radius of curvature of the image-forming side surface of the eighth lens is R16, The eighth lens has an axial thickness of d15; the total system length of the imaging optical lens is TTL; -12.50≦(R15+R16) / (R15-R16)≦0.02 0.01≦d15 / TTL≦0.05 Satisfying the above relation, The imaging optical lens of claim 1 .

12. The first lens and / or the second lens and / or the third lens and / or the fourth lens and / or the fifth lens and / or the sixth lens and / or the seventh lens and / or the eighth lens are made of a glass material. The imaging optical lens of claim 1 .

Images