Optical imaging lens

Abstract

This invention provides an optical imaging lens, comprising, from the object side to the image side, sequentially along the optical axis 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. The first lens has a positive refractive index and its image-side optical axis region is concave. The second lens has a convex circumferential region on its object side, the third lens has a convex circumferential region on its image side, the fifth lens has a convex circumferential region on its image side, the sixth lens has a negative refractive index, and the eighth lens has a convex circumferential region on its object side. This optical imaging lens comprises only these eight lenses, and satisfies V3+V5+V7≦120.000. This optical imaging lens has the advantages of a small aperture value (Fno), a large image height, improved chromatic aberration, and excellent image quality.

Description

Technical Field

[0001] The present invention belongs to the field of optical elements, and in particular relates to an optical imaging lens. Background Art

[0002] In recent years, optical imaging lenses have been continuously evolving, and their applications have become more extensive. In addition to requiring the lens to be thin, light, and short, the design of a small aperture value (Fno) is conducive to increasing the light flux, and a large field of view is gradually becoming a trend. In addition, in order to increase the pixel and resolution, the image height of the lens must be increased, and a larger image sensor is used to receive the imaging light to meet the high pixel requirements. Therefore, how to design an optical imaging lens that is both thin, light, and short, and has a small aperture value, a large image height, and good imaging quality has become a challenge that needs to be solved. Summary of the invention

[0003] The present invention provides an optical imaging lens, which can provide a lens with a small aperture value (Fno), a large image height, improved chromatic aberration and excellent imaging quality. The optical imaging lens can be used for shooting images and recording videos, and can be applied to portable electronic products, such as: mobile phones, cameras, tablet computers, personal digital assistants (PDAs) or head-mounted displays (such as augmented reality (AR), virtual reality (VR) or mixed reality (MR) displays), etc.

[0004] An optical imaging lens includes, in order from the object side to the image side along the optical axis, 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, and each of the first lens to the eighth lens includes an object side surface facing the object side and allowing imaging light to pass therethrough and an image side surface facing the image side and allowing imaging light to pass therethrough. The first lens has a positive refractive power, and the optical axis region of the image side surface of the first lens is a concave surface. The circumferential region of the object side surface of the second lens is a convex surface. The circumferential region of the image side surface of the third lens is a convex surface. The optical axis region of the image side surface of the fifth lens is a convex surface. The sixth lens has a negative refractive power. The circumferential region of the object side surface of the eighth lens is a convex surface. Among them, the optical imaging lens only has the above eight lenses, and the optical imaging lens satisfies the following conditional formula: V3+V5+V7≦120.000; wherein V3 is the Abbe number of the third lens, V5 is the Abbe number of the fifth lens, and V7 is the Abbe number of the seventh lens.

[0005] An optical imaging lens includes, in order from the object side to the image side along the optical axis, 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, and each of the first lens to the eighth lens includes an object side surface facing the object side and allowing imaging light to pass therethrough and an image side surface facing the image side and allowing imaging light to pass therethrough. The first lens has a positive refractive power, and the optical axis region of the image side surface of the first lens is a concave surface. The circumferential region of the image side surface of the third lens is a convex surface. The optical axis region of the image side surface of the fifth lens is a convex surface. The sixth lens has a negative refractive power. The circumferential region of the object side surface of the seventh lens is a concave surface. The circumferential region of the object side surface of the eighth lens is a convex surface. Among them, the optical imaging lens has only the above-mentioned eight lenses, and the optical imaging lens satisfies the following conditional formula: V3+V5+V7≦120.000; wherein V3 is the Abbe number of the third lens, V5 is the Abbe number of the fifth lens, and V7 is the Abbe number of the seventh lens.

[0006] An optical imaging lens includes, in order from the object side to the image side along the optical axis, 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, and each of the first lens to the eighth lens includes an object side surface facing the object side and allowing imaging light to pass therethrough and an image side surface facing the image side and allowing imaging light to pass therethrough. The first lens has a positive refractive power and the optical axis region of the image side surface of the first lens is a concave surface. The circumferential region of the image side surface of the third lens is a convex surface. The optical axis region of the image side surface of the fifth lens is a convex surface. The sixth lens has a negative refractive power. The circumferential region of the object side surface of the eighth lens is a convex surface and the optical axis region of the image side surface of the eighth lens is a concave surface. Among them, the optical imaging lens has only the above-mentioned eight lenses, and the optical imaging lens satisfies the following conditional formula: V3+V5+V7≦120.000; wherein V3 is the Abbe number of the third lens, V5 is the Abbe number of the fifth lens, and V7 is the Abbe number of the seventh lens.

[0007] Based on the above, the beneficial effect of the optical imaging lens of the embodiment of the present invention is that the optical imaging lens of the embodiment of the present invention can provide a lens with a smaller aperture value, a larger image height, improved chromatic aberration and excellent imaging quality by satisfying the above number of lenses, the above surface shape design of the lenses and satisfying the above conditional expressions.

[0008] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram illustrating the surface structure of a lens.

[0010] Figure 2 It is a schematic diagram illustrating the concave-convex structure of a lens surface and the focus of light.

[0011] Figure 3 is a schematic diagram illustrating the surface structure of a lens of Example 1.

[0012] Figure 4 is a schematic diagram illustrating the surface structure of a lens of Example 2.

[0013] Figure 5 is a schematic diagram illustrating the surface structure of a lens of Example 3.

[0014] Figure 6 FIG. 4 is a schematic diagram of an optical imaging lens according to a first embodiment of the present invention.

[0015] Figure 7 Graphs showing the longitudinal spherical aberration and various aberrations of the optical imaging lens of the first embodiment.

[0016] Figure 8 Detailed optical data of the optical imaging lens according to the first embodiment of the present invention is shown.

[0017] Fig. 9 The aspherical parameters of the optical imaging lens according to the first embodiment of the present invention are shown.

[0018] Fig.10 FIG. 4 is a schematic diagram of an optical imaging lens according to a second embodiment of the present invention.

[0019] Fig.11 Graphs showing the longitudinal spherical aberration and various aberrations of the optical imaging lens of the second embodiment.

[0020] Fig.12 Detailed optical data of the optical imaging lens according to the second embodiment of the present invention is shown.

[0021] Fig.13 The aspherical parameters of the optical imaging lens according to the second embodiment of the present invention are shown.

[0022] Fig.14 FIG. 4 is a schematic diagram of an optical imaging lens according to a third embodiment of the present invention.

[0023] Fig.15 Graphs showing the longitudinal spherical aberration and various aberrations of the optical imaging lens of the third embodiment.

[0024] Fig.16 Detailed optical data of the optical imaging lens according to the third embodiment of the present invention is shown.

[0025] Fig.17 The aspherical parameters of the optical imaging lens according to the third embodiment of the present invention are shown.

[0026] Fig.18 FIG. 4 is a schematic diagram of an optical imaging lens according to a fourth embodiment of the present invention.

[0027] Fig.19 Graphs showing the longitudinal spherical aberration and various aberrations of the optical imaging lens of the fourth embodiment.

[0028] Fig. 20 Detailed optical data of the optical imaging lens according to the fourth embodiment of the present invention are shown.

[0029] Fig.21 The aspherical parameters of the optical imaging lens according to the fourth embodiment of the present invention are shown.

[0030] Fig. 22 FIG. 4 is a schematic diagram of an optical imaging lens according to a fifth embodiment of the present invention.

[0031] Fig.23 Graphs showing the longitudinal spherical aberration and various aberrations of the optical imaging lens system of the fifth embodiment.

[0032] Fig.24 Detailed optical data of the optical imaging lens according to the fifth embodiment of the present invention are shown.

[0033] Fig.25 FIG. 5 shows aspherical parameters of the optical imaging lens according to the fifth embodiment of the present invention.

[0034] Fig.26 FIG. 4 is a schematic diagram of an optical imaging lens according to a sixth embodiment of the present invention.

[0035] Fig. 27 Graphs showing the longitudinal spherical aberration and various aberrations of the optical imaging lens system of the sixth embodiment.

[0036] Fig.28 Detailed optical data of the optical imaging lens according to the sixth embodiment of the present invention are shown.

[0037] Fig.29 FIG. 6 shows aspherical parameters of the optical imaging lens according to the sixth embodiment of the present invention.

[0038] Figure 30 to Figure 31 The important parameters and conditional expressions of the optical imaging lenses according to the first to sixth embodiments of the present invention are shown. DETAILED DESCRIPTION

[0039] Before describing the present invention in detail, the following symbols in the accompanying drawings are first clearly indicated: 100, 200, 300, 400, 500: lenses; 15, 25, 35, 45, 55, 65, 75, 85, 95, 110, 410, 510: object side surface; 16, 26, 36, 46, 56, 66, 76, 86, 96, 120, 320: image side surface; 130: assembly unit; 211, 212: parallel light rays; 10: optical imaging lens; 0: aperture; 1: first lens; 2: second lens; 3: third lens; 4: fourth lens; 5: fifth lens; 6: sixth lens; 7: seventh lens; 8: eighth lens; 9: filter; 99: imaging surface; Z1, 151, 162, 251, 262 , 351, 362, 452, 461, 551, 552, 561, 652, 661, 662, 751, 762, 851, 852, 862: optical axis area; Z2, 153, 164, 253, 264, 354, 363, 453, 454, 463, 554, 563, 654, 663, 754, 763, 853, 863, 864: circular area; A1: object side; A2: image side; CP: center point; CP1: first center point; CP2: second center point; EL: extension line; I: optical axis; Lm: marginal ray; Lc: principal ray; OB: optical boundary; M, R: intersection points; TP1: first transition point; TP2: second transition point; Z3: relay area.

[0040] The terms "optical axis region", "circumferential region", "concave surface" and "convex surface" used in this specification and the claims should be interpreted based on the definitions listed in this specification.

[0041] The optical system of the present specification includes at least one lens, which receives imaging light from the incident optical system that is parallel to the optical axis and within a half-viewing angle (HFOV) relative to the optical axis. The imaging light is imaged on the imaging surface through the optical system. The "lens has a positive refractive power (or negative refractive power)" refers to the paraxial refractive power of the lens calculated by Gaussian optical theory is positive (or negative). The "object side (or image side) of the lens" is defined as a specific range of the imaging light passing through the lens surface. The imaging light includes at least two types of light: the chief ray Lc and the marginal ray Lm (such as Figure 1 The object side (or image side) of the lens can be divided into different regions according to different positions, including an optical axis region, a circumferential region, or one or more intermediate regions in some embodiments. The description of these regions will be described in detail below.

[0042] Figure 1is a radial cross-sectional view of the lens 100. Two reference points on the surface of the lens 100 are defined: a center point and a transition point. The center point of the lens surface is an intersection of the surface and the optical axis I. Figure 1 As shown in the example, the first center point CP1 is located on the object side 110 of the lens 100, and the second center point CP2 is located on the image side 120 of the lens 100. A conversion point is a point on the lens surface, and the tangent of the point is perpendicular to the optical axis I. The optical boundary OB of the lens surface is defined as the point where the radially outermost edge ray Lm passing through the lens surface intersects the lens surface. All conversion points are located between the optical axis I and the optical boundary OB of the lens surface. In addition, the surface of the lens 100 may have no conversion points or at least one conversion point. If a single lens surface has multiple conversion points, the conversion points are named in sequence from the first conversion point in the radial outward direction. For example, the first conversion point TP1 (closest to the optical axis I), the second conversion point TP2 (closest to the optical axis I), and the second conversion point TP2 (closest to the optical axis I) may be named in sequence. Figure 4 as shown) and the Nth conversion point (farthest from the optical axis I).

[0043] When the lens surface has at least one transition point, the range from the center point to the first transition point TP1 is defined as the optical axis area, wherein the optical axis area includes the center point. The area radially outward from the transition point farthest from the optical axis I (the Nth transition point) to the optical boundary OB is defined as the circumferential area. In some embodiments, a relay area between the optical axis area and the circumferential area may be further included, and the number of relay areas depends on the number of transition points. When the lens surface does not have a transition point, 0% to 50% of the distance from the optical axis I to the optical boundary OB of the lens surface is defined as the optical axis area, and 50% to 100% of the distance from the optical axis I to the optical boundary OB of the lens surface is defined as the circumferential area.

[0044] When a light ray parallel to the optical axis I passes through an area, if the light ray is deflected toward the optical axis I and the intersection with the optical axis I is located at the image side A2 of the lens, then the area is convex. When a light ray parallel to the optical axis I passes through an area, if the intersection of the extended line of the light ray and the optical axis I is located at the object side A1 of the lens, then the area is concave.

[0045] In addition, see Figure 1 The lens 100 may further include an assembly portion 130 extending radially outward from the optical boundary OB. The assembly portion 130 is generally used for assembling the lens 100 to a corresponding element (not shown) of the optical system. The imaging light does not reach the assembly portion 130. The structure and shape of the assembly portion 130 are merely examples for illustrating the present invention and are not intended to limit the scope of the present invention. The assembly portion 130 of the lens discussed below may be partially or completely omitted in the drawings.

[0046] See also Figure 2, define the area between the center point CP and the first transition point TP1 as the optical axis area Z1. Define the area between the first transition point TP1 and the optical boundary OB of the lens surface as the circumferential area Z2. Figure 2 As shown, after passing through the optical axis region Z1, the parallel light 211 intersects with the optical axis I at the image side A2 of the lens 200, that is, the focus of the parallel light 211 passing through the optical axis region Z1 is located at point R on the image side A2 of the lens 200. Since the light intersects with the optical axis I at the image side A2 of the lens 200, the optical axis region Z1 is a convex surface. On the contrary, the parallel light 212 diverges after passing through the circumferential region Z2. Figure 2 As shown, the extended line EL of the parallel light 212 after passing through the circumferential area Z2 intersects with the optical axis I at the object side A1 of the lens 200, that is, the focus of the parallel light 212 passing through the circumferential area Z2 is located at point M on the object side A1 of the lens 200. Since the extended line EL of the light intersects with the optical axis I at the object side A1 of the lens 200, the circumferential area Z2 is a concave surface. Figure 2 In the lens 200 shown, the first transition point TP1 is the boundary between the optical axis area and the circumferential area, that is, the first transition point TP1 is the boundary point where the convex surface turns into the concave surface.

[0047] On the other hand, the surface convexity of the optical axis area can also be determined according to the judgment method of the general knowledgeable person in the field, that is, the convexity of the surface shape of the optical axis area of ​​the lens can be determined by the positive and negative signs of the curvature radius of the paraxial axis (abbreviated as R value). R value can be commonly used in optical design software, such as Zemax or CodeV. R value is also commonly found in the lens data sheet of optical design software. For the object side, when the R value is positive, the optical axis area of ​​the object side is determined to be convex; when the R value is negative, the optical axis area of ​​the object side is determined to be concave. On the contrary, for the image side, when the R value is positive, the optical axis area of ​​the image side is determined to be concave; when the R value is negative, the optical axis area of ​​the image side is determined to be convex. The result of this method is consistent with the result of the above-mentioned determination method by the intersection of the light ray / light extension line and the optical axis. The determination method of the intersection of the light ray / light extension line and the optical axis is to determine the surface convexity by locating the focus of a light ray parallel to the optical axis on the object side or the image side of the lens. The terms “a region is a convex surface (or a concave surface)”, “a region is convex (or concave)” or “a convex (or concave) region” described in this specification can be used interchangeably.

[0048] Figures 3 to 5 Examples are provided for determining the surface shape and area boundaries of lens areas in various situations, including the aforementioned optical axis area, circumferential area, and relay area.

[0049] Figure 3 is a radial cross-sectional view of the lens 300. Figure 3, the image side surface 320 of the lens 300 has only one transition point TP1 within the optical boundary OB. The optical axis area Z1 and the circumferential area Z2 of the image side surface 320 of the lens 300 are as follows: Figure 3 The R value of the image-side surface 320 is positive (ie, R>0), and therefore, the optical axis region Z1 is a concave surface.

[0050] Generally speaking, the shapes of the areas bounded by the conversion point are opposite to those of the adjacent areas. Therefore, the conversion point can be used to define the transition of the surface shape, that is, from concave to convex or from convex to concave. Figure 3 In the figure, since the optical axis area Z1 is a concave surface, the surface shape changes at the transition point TP1, so the circumferential area Z2 is a convex surface.

[0051] Figure 4 is a radial cross-sectional view of the lens 400. Figure 4 , there is a first transition point TP1 and a second transition point TP2 on the object side surface 410 of the lens 400. The area between the optical axis I and the first transition point TP1 is defined as an optical axis region Z1 of the object side surface 410. The R value of the object side surface 410 is positive (ie, R>0), and therefore, the optical axis region Z1 is a convex surface.

[0052] The area between the second transition point TP2 and the optical boundary OB of the object side surface 410 of the lens 400 is defined as a circumferential area Z2, and the circumferential area Z2 of the object side surface 410 is also a convex surface. In addition, the area between the first transition point TP1 and the second transition point TP2 is defined as a relay area Z3, and the relay area Z3 of the object side surface 410 is a concave surface. Figure 4 The object side surface 410 includes, radially outward from the optical axis I, an optical axis region Z1 between the optical axis I and the first conversion point TP1, a relay region Z3 between the first conversion point TP1 and the second conversion point TP2, and a circumferential region Z2 between the second conversion point TP2 and the optical boundary OB of the object side surface 410 of the lens 400. Since the optical axis region Z1 is a convex surface, the surface shape changes from the first conversion point TP1 to a concave surface, so the relay region Z3 is a concave surface, and the surface shape changes from the second conversion point TP2 to a convex surface, so the circumferential region Z2 is a convex surface.

[0053] Figure 5 is a radial cross-sectional view of the lens 500. The object side surface 510 of the lens 500 has no transition point. For a lens surface without a transition point, such as the object side surface 510 of the lens 500, 0% to 50% of the distance from the optical axis I to the optical boundary OB of the lens surface is defined as the optical axis area, and 50% to 100% of the distance from the optical axis I to the optical boundary OB of the lens surface is defined as the circumferential area. Figure 5The lens 500 shown in the figure defines the optical axis region Z1 of the object side surface 510 as 50% of the distance from the optical axis I to the optical boundary OB of the lens 500 surface. The R value of the object side surface 510 is positive (i.e., R>0), so the optical axis region Z1 is a convex surface. Since the object side surface 510 of the lens 500 has no transition point, the circumferential region Z2 of the object side surface 510 is also a convex surface. The lens 500 may further have an assembly portion (not shown) extending radially outward from the circumferential region Z2.

[0054] Figure 6 is a schematic diagram of an optical imaging lens according to a first embodiment of the present invention, and Figure 7 A to Figure 7 D is a diagram of the longitudinal spherical aberration and various aberrations of the optical imaging lens of the first embodiment. Figure 6 The optical imaging lens 10 of the first embodiment of the present invention includes an aperture 0, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8 and a filter 9 in order from the object side A1 to the image side A2 along an optical axis I of the optical imaging lens 10. When light emitted by an object to be photographed enters the optical imaging lens 10 and passes through the aperture 0, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8 and the filter 9 in order, an image is formed on an image plane 99. It should be noted that the object side A1 is the side facing the object to be photographed, and the image side A2 is the side facing the image plane 99.

[0055] In this embodiment, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8 and the filter 9 of the optical imaging lens 10 each have an object-side surface 15, 25, 35, 45, 55, 65, 75, 85, 95 facing the object side A1 and allowing the imaging light to pass through, and an image-side surface 16, 26, 36, 46, 56, 66, 76, 86, 96 facing the image side A2 and allowing the imaging light to pass through. In this embodiment, the aperture O is disposed on the object-side surface 15 of the first lens 1. The filter 9 is disposed between the image-side surface 86 and the imaging surface 99 of the eighth lens 8. The filter 9 is an infrared cut filter that allows other wavelengths of light to pass through and blocks infrared wavelengths of light, but the present invention is not limited thereto.

[0056] The first lens 1 has a positive refractive power. The material of the first lens 1 is plastic, but the present invention is not limited thereto. The optical axis region 151 of the object side surface 15 of the first lens 1 is a convex surface, and its circumferential region 153 is a convex surface. The optical axis region 162 of the image side surface 16 of the first lens 1 is a concave surface, and its circumferential region 164 is a concave surface. In the present embodiment, both the object side surface 15 and the image side surface 16 of the first lens 1 are aspheric surfaces.

[0057] The second lens 2 has a negative refractive power. The material of the second lens 2 is plastic, but the present invention is not limited thereto. The optical axis region 251 of the object side surface 25 of the second lens 2 is a convex surface, and its circumferential region 253 is a convex surface. The optical axis region 262 of the image side surface 26 of the second lens 2 is a concave surface, and its circumferential region 264 is a concave surface. In this embodiment, both the object side surface 25 and the image side surface 26 of the second lens 2 are aspherical surfaces.

[0058] The third lens 3 has a negative refractive power. The material of the third lens 3 is plastic, but the present invention is not limited thereto. The optical axis region 351 of the object side surface 35 of the third lens 3 is a convex surface, and its circumferential region 354 is a concave surface. The optical axis region 362 of the image side surface 36 of the third lens 3 is a concave surface, and its circumferential region 363 is a convex surface. In this embodiment, the object side surface 35 and the image side surface 36 of the third lens 3 are both aspherical surfaces.

[0059] The fourth lens 4 has a positive refractive power. The material of the fourth lens 4 is plastic, but the present invention is not limited thereto. The optical axis region 452 of the object side surface 45 of the fourth lens 4 is a concave surface, and the circumferential region 453 thereof is a convex surface. The optical axis region 461 of the image side surface 46 of the fourth lens 4 is a convex surface, and the circumferential region 463 thereof is a convex surface. In the present embodiment, both the object side surface 45 and the image side surface 46 of the fourth lens 4 are aspherical surfaces.

[0060] The fifth lens 5 has a negative refractive power. The material of the fifth lens 5 is plastic, but the present invention is not limited thereto. The optical axis region 552 of the object side surface 55 of the fifth lens 5 is a concave surface, and its circumferential region 554 is a concave surface. The optical axis region 561 of the image side surface 56 of the fifth lens 5 is a convex surface, and its circumferential region 563 is a convex surface. In this embodiment, both the object side surface 55 and the image side surface 56 of the fifth lens 5 are aspherical surfaces.

[0061] The sixth lens 6 has a negative refractive power. The material of the sixth lens 6 is plastic, but the present invention is not limited thereto. The optical axis region 652 of the object side surface 65 of the sixth lens 6 is a concave surface, and its circumferential region 654 is a concave surface. The optical axis region 662 of the image side surface 66 of the sixth lens 6 is a concave surface, and its circumferential region 663 is a convex surface. In this embodiment, the object side surface 65 and the image side surface 66 of the sixth lens 6 are both aspherical surfaces.

[0062] The seventh lens 7 has a positive refractive power. The material of the seventh lens 7 is plastic, but the present invention is not limited thereto. The optical axis region 751 of the object side surface 75 of the seventh lens 7 is a convex surface, and its circumferential region 754 is a concave surface. The optical axis region 762 of the image side surface 76 of the seventh lens 7 is a concave surface, and its circumferential region 763 is a convex surface. In this embodiment, both the object side surface 75 and the image side surface 76 of the seventh lens 7 are aspherical surfaces.

[0063] The eighth lens 8 has a negative refractive power. The material of the eighth lens 8 is plastic, but the present invention is not limited thereto. The optical axis region 852 of the object side surface 85 of the eighth lens 8 is a concave surface, and its circumferential region 853 is a convex surface. The optical axis region 862 of the image side surface 86 of the eighth lens 8 is a concave surface, and its circumferential region 863 is a convex surface. In this embodiment, the object side surface 85 and the image side surface 86 of the eighth lens 8 are both aspherical surfaces.

[0064] In this embodiment, the optical imaging lens 10 includes only eight lenses, namely, a first lens 1 , a second lens 2 , a third lens 3 , a fourth lens 4 , a fifth lens 5 , a sixth lens 6 , a seventh lens 7 and an eighth lens 8 .

[0065] Other detailed optical data of the first embodiment are as follows Figure 8 As shown, the effective focal length (EFL) of the optical imaging lens system 10 of the first embodiment is 7.863 millimeters (mm), the half field of view (HFOV) is 42.258 degrees, the system length (TTL) is 9.675 millimeters, the aperture value (F-number, Fno) is 1.700, and the image height (ImgH) is 6.387 millimeters, wherein the system length refers to the distance from the object side surface 15 of the first lens 1 to the imaging surface 99 on the optical axis I.

[0066] In addition, in this embodiment, the object-side surfaces 15, 25, 35, 45, 55, 65, 75, 85 and the image-side surfaces 16, 26, 36, 46, 56, 66, 76, 86 of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8 are all aspheric surfaces, and these aspheric surfaces are defined according to the following formulas:

[0067]

[0068] in:

[0069] Y: the vertical distance between the point on the aspherical surface and the optical axis I;

[0070] Z: Depth of the aspherical surface (the vertical distance between the point on the aspherical surface that is Y away from the optical axis I and the tangent plane tangent to the vertex on the aspherical surface optical axis I);

[0071] R: radius of curvature of the lens surface at the near optical axis I;

[0072] K: conic constant;

[0073] a i : i-th order aspheric coefficient.

[0074] The aspheric coefficients of the various items from the object side surface 15 of the first lens 1 to the image side surface 86 of the eighth lens 8 in formula (1) are as follows: Fig. 9 As shown. Among them, Fig. 9 The number 15 in the middle column indicates the aspheric coefficient of the object side surface 15 of the first lens 1, and the same applies to the other columns. Fig. 9 Odd-order aspheric coefficients not listed in the table or in the tables of the embodiments (e.g. a 1 、a 3 、a 5 、a 7 ...etc.) and the second-order aspheric coefficient (a 2 ) are all 0.

[0075] In addition, the relationship between the important parameters of the optical imaging lens 10 of the first embodiment is as follows: Figure 30 to Figure 31 As shown, among which, Fig.30 , the units of the parameters in the columns T1 to Tmin and ImgH are millimeters (mm), and the unit of the parameters in the column HFOV is degrees.

[0076] in,

[0077] T1 is the thickness of the first lens 1 on the optical axis I;

[0078] T2 is the thickness of the second lens 2 on the optical axis I;

[0079] T3 is the thickness of the third lens 3 on the optical axis I;

[0080] T4 is the thickness of the fourth lens 4 on the optical axis I;

[0081] T5 is the thickness of the fifth lens 5 on the optical axis I;

[0082] T6 is the thickness of the sixth lens 6 on the optical axis I;

[0083] T7 is the thickness of the seventh lens 7 on the optical axis I;

[0084] T8 is the thickness of the eighth lens 8 on the optical axis I;

[0085] TF is the thickness of the filter 9 on the optical axis I;

[0086] G12 is the air gap between the first lens 1 and the second lens 2 on the optical axis I, and is also the distance from the image side surface 16 of the first lens 1 to the object side surface 25 of the second lens 2 on the optical axis I;

[0087] G23 is the air gap between the second lens 2 and the third lens 3 on the optical axis I, and is also the distance from the image side surface 26 of the second lens 2 to the object side surface 35 of the third lens 3 on the optical axis I;

[0088] G34 is the air gap between the third lens 3 and the fourth lens 4 on the optical axis I, and is also the distance from the image side surface 36 of the third lens 3 to the object side surface 45 of the fourth lens 4 on the optical axis I;

[0089] G45 is the air gap between the fourth lens 4 and the fifth lens 5 on the optical axis I, and is also the distance from the image side surface 46 of the fourth lens 4 to the object side surface 55 of the fifth lens 5 on the optical axis I;

[0090] G56 is the air gap between the fifth lens 5 and the sixth lens 6 on the optical axis I, and is also the distance between the image side surface 56 of the fifth lens 5 and the object side surface 65 of the sixth lens 6 on the optical axis I;

[0091] G67 is the air gap between the sixth lens 6 and the seventh lens 7 on the optical axis I, and is also the distance between the image side surface 66 of the sixth lens 6 and the object side surface 75 of the seventh lens 7 on the optical axis I;

[0092] G78 is the air gap between the seventh lens 7 and the eighth lens 8 on the optical axis I, and is also the distance between the image side surface 76 of the seventh lens 7 and the object side surface 85 of the eighth lens 8 on the optical axis I;

[0093] G8F is the air gap between the eighth lens 8 and the filter 9 on the optical axis I, and is also the distance from the image side surface 86 of the eighth lens 8 to the object side surface 95 of the filter 9 on the optical axis I;

[0094] GFP is the air gap between the filter 9 and the imaging surface 99 on the optical axis I, and is also the distance between the image side surface 96 of the filter 9 and the imaging surface 99 on the optical axis I;

[0095] AAG is the sum of seven air gaps of the first lens 1 to the eighth lens 8 on the optical axis I, that is, the sum of G12, G23, G34, G45, G56, G67, and G78;

[0096] ALT is the sum of the thicknesses of the eight lenses from the first lens 1 to the eighth lens 8 on the optical axis I, that is, the sum of T1, T2, T3, T4, T5, T6, T7, and T8;

[0097] Tmax is the maximum value of the thicknesses of eight lenses from the first lens 1 to the eighth lens 8 on the optical axis I, that is, the maximum value of T1, T2, T3, T4, T5, T6, T7, and T8;

[0098] Tmin is the minimum value of the thickness of eight lenses from the first lens 1 to the eighth lens 8 on the optical axis I, that is, the minimum value of T1, T2, T3, T4, T5, T6, T7, and T8;

[0099] Tavg is the average thickness of eight lenses from the first lens 1 to the eighth lens 8 on the optical axis I, that is, the average thickness of T1, T2, T3, T4, T5, T6, T7, and T8;

[0100] TL is the distance between the object side surface 15 of the first lens 1 and the image side surface 86 of the eighth lens 8 on the optical axis I;

[0101] TTL is the distance from the object side surface 15 of the first lens 1 to the imaging surface 99 on the optical axis I;

[0102] BFL is the distance from the image side surface 86 of the eighth lens 8 to the imaging surface 99 on the optical axis I, that is, the sum of G8F, TF, and GFP;

[0103] EFL is the effective focal length of the optical imaging lens 10;

[0104] HFOV is the half viewing angle of the optical imaging lens 10;

[0105] ImgH is the image height of the optical imaging lens 10;

[0106] Fno is the aperture value (F-number) of the optical imaging lens 10 .

[0107] In addition, define:

[0108] f1 is the focal length of the first lens 1;

[0109] f2 is the focal length of the second lens 2;

[0110] f3 is the focal length of the third lens 3;

[0111] f4 is the focal length of the fourth lens 4;

[0112] f5 is the focal length of the fifth lens 5;

[0113] f6 is the focal length of the sixth lens 6;

[0114] f7 is the focal length of the seventh lens 7;

[0115] f8 is the focal length of the eighth lens 8;

[0116] n1 is the refractive index of the first lens 1;

[0117] n2 is the refractive index of the second lens 2;

[0118] n3 is the refractive index of the third lens 3;

[0119] n4 is the refractive index of the fourth lens 4;

[0120] n5 is the refractive index of the fifth lens 5;

[0121] n6 is the refractive index of the sixth lens 6;

[0122] n7 is the refractive index of the seventh lens 7;

[0123] n8 is the refractive index of the eighth lens 8;

[0124] V1 is the Abbe number of the first lens 1;

[0125] V2 is the Abbe number of the second lens 2;

[0126] V3 is the Abbe number of the third lens 3;

[0127] V4 is the Abbe number of the fourth lens 4;

[0128] V5 is the Abbe number of the fifth lens 5;

[0129] V6 is the Abbe number of the sixth lens 6;

[0130] V7 is the Abbe number of the seventh lens 7;

[0131] V8 is the Abbe number of the eighth lens 8.

[0132] Also refer to Figure 7 A to Figure 7 D, Figure 7 The diagram of A illustrates the longitudinal spherical aberration (Longitudinal Spherical Aberration) of the first embodiment. Figure 7 B and Figure 7 The diagrams of C respectively illustrate the field curvature aberration in the sagittal direction and the field curvature aberration in the tangential direction on the imaging surface 99 of the first embodiment when the wavelength is 470 nanometers (nm), 555 nm and 650 nm. Figure 7 The diagram of D illustrates the distortion aberration of the first embodiment on the imaging surface 99 when the wavelength is 470nm, 555nm and 650nm. Figure 7In A, the curves formed by each wavelength are very close and close to the middle, indicating that the off-axis light rays of different heights of each wavelength are concentrated near the imaging point. It can be seen from the deflection amplitude of the curve of each wavelength that the imaging point deviation of the off-axis light rays of different heights is controlled within the range of ±0.045 mm. Therefore, the first embodiment does significantly improve the spherical aberration of the same wavelength. In addition, the distances between the three representative wavelengths are also very close to each other, representing that the imaging positions of the light rays of different wavelengths are already very concentrated, thereby significantly improving the chromatic aberration.

[0133] exist Figure 7 B and Figure 7 In the two field curvature aberration diagrams of C, the field curvature aberrations of the three representative wavelengths in the entire field of view fall within ±0.12 mm, indicating that the optical system of the first embodiment can effectively eliminate aberrations. Figure 7 The distortion diagram of D shows that the distortion of the first embodiment is maintained within the range of ±12%, indicating that the distortion of the first embodiment can meet the imaging quality requirements of the optical system. Accordingly, compared with the conventional optical imaging lens, the optical imaging lens of the first embodiment can shorten the system length to about 9.675 mm under the conditions of having an aperture value of 1.700 and an image height of 6.387 mm, and can still provide good imaging quality and chromatic aberration performance.

[0134] Fig.10 is a schematic diagram of an optical imaging lens according to a second embodiment of the present invention, and Fig.11 A to Fig.11 D is a diagram of longitudinal spherical aberration and various aberrations of the optical imaging lens of the second embodiment. Fig.10 The second embodiment of the optical imaging lens 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows: the optical data, aspheric coefficients and parameters between lenses 1, 2, 3, 4, 5, 6, 7 and 8 are more or less different. In addition, in this embodiment, the third lens 3 has a positive refractive power. It should be noted that in order to clearly show the diagram, Fig.10 The reference numerals of the optical axis area and the circumferential area similar to those in the first embodiment are omitted.

[0135] Detailed optical data of the optical imaging lens 10 of the second embodiment are as follows: Fig.12 As shown, the effective focal length (EFL) of the optical imaging lens 10 of the second embodiment is 7.755 mm, the half field of view (HFOV) is 42.258 degrees, the system length (TTL) is 9.518 mm, the aperture value (Fno) is 1.700, and the image height (ImgH) is 7.013 mm.

[0136] like Fig.13As shown, the aspheric coefficients of the second embodiment from the object side surface 15 of the first lens 1 to the image side surface 86 of the eighth lens 8 in formula (1) are shown.

[0137] In addition, the relationship between the important parameters of the optical imaging lens 10 of the second embodiment is as follows: Figure 30 to Figure 31 shown.

[0138] The longitudinal spherical aberration diagram of the second embodiment Fig.11 In A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±0.08 mm. Fig.11 B and Fig.11 In the two field curvature aberration diagrams of C, the field curvature aberrations of the three representative wavelengths in the entire field of view fall within ±0.25 mm. Fig.11 The distortion diagram of D shows that the distortion of the second embodiment is maintained within the range of ±4%. This shows that compared with the existing optical imaging lens, the system length of the second embodiment can be shortened to about 9.518 mm under the conditions of an aperture value of 1.700 and an image height of 7.013 mm, and still provide good imaging quality and chromatic aberration performance.

[0139] From the above description, it can be seen that the advantages of the second embodiment over the first embodiment are: the system length (TTL) of the second embodiment is shorter than that of the first embodiment, the image height (ImgH) of the second embodiment is larger than that of the first embodiment, and the distortion aberration of the second embodiment is better than that of the first embodiment.

[0140] Fig.14 is a schematic diagram of an optical imaging lens according to a third embodiment of the present invention, and Fig.15 A to Fig.15 D is a diagram of longitudinal spherical aberration and various aberrations of the optical imaging lens of the third embodiment. Fig.14 The third embodiment of the optical imaging lens 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows: the optical data, aspheric coefficients, and parameters between lenses 1, 2, 3, 4, 5, 6, 7, and 8 are more or less different. In addition, in this embodiment, the second lens 2 has a positive refractive power, and the optical axis region 661 of the image side surface 66 of the sixth lens 6 is a convex surface. It should be noted here that in order to clearly show the drawing, Fig.14 The reference numerals of the optical axis area and the circumferential area similar to those in the first embodiment are omitted.

[0141] The detailed optical data of the optical imaging lens 10 of the third embodiment are as follows: Fig.16As shown, the effective focal length (EFL) of the optical imaging lens 10 of the third embodiment is 5.745 mm, the half field of view (HFOV) is 42.258 degrees, the system length (TTL) is 7.794 mm, the aperture value (Fno) is 1.700, and the image height (ImgH) is 5.173 mm.

[0142] like Fig.17 As shown, the aspheric coefficients of the third embodiment from the object side surface 15 of the first lens 1 to the image side surface 86 of the eighth lens 8 in formula (1) are shown.

[0143] In addition, the relationship between the important parameters of the optical imaging lens 10 of the third embodiment is as follows: Figure 30 to Figure 31 shown.

[0144] The longitudinal spherical aberration diagram of the third embodiment Fig.15 In A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±0.06 mm. Fig.15 B and Fig.15 In the two field curvature aberration diagrams of C, the field curvature aberrations of the three representative wavelengths in the entire field of view fall within ±0.35 mm. Fig.15 The distortion diagram of D shows that the distortion of the third embodiment is maintained within the range of ±3%. This shows that compared with the existing optical imaging lens, the third embodiment can shorten the system length to about 7.794 mm under the conditions of an aperture value of 1.700 and an image height of 5.173 mm, and still provide good imaging quality and chromatic aberration performance.

[0145] It can be seen from the above description that the advantages of the third embodiment over the first embodiment are: the system length (TTL) of the third embodiment is shorter than that of the first embodiment, and the distortion aberration of the third embodiment is better than that of the first embodiment.

[0146] Fig.18 is a schematic diagram of an optical imaging lens according to a fourth embodiment of the present invention, and Fig.19 A to Fig.19 D is a diagram of longitudinal spherical aberration and various aberrations of the optical imaging lens of the fourth embodiment. Fig.18 The fourth embodiment of the optical imaging lens 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows: the optical data, aspheric coefficients and parameters between lenses 1, 2, 3, 4, 5, 6, 7 and 8 are more or less different. In addition, in this embodiment, the third lens 3 has a positive refractive power. It should be noted here that in order to clearly show the diagram, Fig.18 The reference numerals of the optical axis area and the circumferential area similar to those in the first embodiment are omitted.

[0147] Detailed optical data of the optical imaging lens 10 of the fourth embodiment are as follows: Fig. 20 As shown, the effective focal length (EFL) of the optical imaging lens 10 of the fourth embodiment is 7.466 mm, the half field of view (HFOV) is 41.773 degrees, the system length (TTL) is 9.316 mm, the aperture value (Fno) is 1.700, and the image height (ImgH) is 7.153 mm.

[0148] like Fig.21 As shown, the aspheric coefficients of the fourth embodiment from the object side surface 15 of the first lens 1 to the image side surface 86 of the eighth lens 8 in formula (1) are shown.

[0149] In addition, the relationship between the important parameters of the optical imaging lens 10 of the fourth embodiment is as follows: Figure 30 to Figure 31 shown.

[0150] The longitudinal spherical aberration diagram of the fourth embodiment Fig.19 In A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±0.025 mm. Fig.19 B and Fig.19 In the two field curvature aberration diagrams of C, the field curvature aberrations of the three representative wavelengths in the entire field of view fall within ±0.07 mm. Fig.19 The distortion diagram of D shows that the distortion of the fourth embodiment is maintained within the range of ±8%. This shows that compared with the existing optical imaging lens, the fourth embodiment can shorten the system length to about 9.316 mm under the conditions of an aperture value of 1.700 and an image height of 7.153 mm, and still provide good imaging quality and chromatic aberration performance.

[0151] From the above description, it can be seen that the advantages of the fourth embodiment compared to the first embodiment are: the system length (TTL) of the fourth embodiment is shorter than that of the first embodiment, the image height (ImgH) of the fourth embodiment is larger than that of the first embodiment, and the longitudinal spherical aberration, field curvature aberration and distortion aberration of the fourth embodiment are better than those of the first embodiment.

[0152] Fig. 22 is a schematic diagram of an optical imaging lens according to a fifth embodiment of the present invention, and Fig.23 A to Fig.23 D is a diagram of longitudinal spherical aberration and various aberrations of the optical imaging lens of the fifth embodiment. Fig. 22 The fifth embodiment of the optical imaging lens 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows: the optical data, aspheric coefficients and parameters between lenses 1, 2, 3, 4, 5, 6, 7 and 8 are more or less different. It should be noted that in order to clearly show the drawings, Fig. 22 The reference numerals of the optical axis area and the circumferential area similar to those in the first embodiment are omitted.

[0153] Detailed optical data of the optical imaging lens 10 of the fifth embodiment are as follows: Fig.24 As shown, the effective focal length (EFL) of the optical imaging lens 10 of the fifth embodiment is 7.628 mm, the half field of view (HFOV) is 43.012 degrees, the system length (TTL) is 9.520 mm, the aperture value (Fno) is 1.700, and the image height (ImgH) is 6.528 mm.

[0154] like Fig.25 As shown, the aspheric coefficients of the fifth embodiment from the object side surface 15 of the first lens 1 to the image side surface 86 of the eighth lens 8 in formula (1) are shown.

[0155] In addition, the relationship between the important parameters of the optical imaging lens 10 of the fifth embodiment is as follows: Figure 30 to Figure 31 shown.

[0156] The longitudinal spherical aberration diagram of the fifth embodiment Fig.23 In A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±0.03 mm. Fig.23 B and Fig.23 In the two field curvature aberration diagrams of C, the field curvature aberrations of the three representative wavelengths in the entire field of view fall within ±0.03 mm. Fig.23 The distortion diagram of D shows that the distortion of the fifth embodiment is maintained within the range of ±9%. This shows that compared with the existing optical imaging lens, the fifth embodiment can shorten the system length to about 9.520 mm under the conditions of an aperture value of 1.700 and an image height of 6.528 mm, and still provide good imaging quality and chromatic aberration performance.

[0157] It can be seen from the above description that the advantages of the fifth embodiment over the first embodiment are: the system length (TTL) of the fifth embodiment is shorter than that of the first embodiment, the half field of view (HFOV) of the fifth embodiment is larger than that of the first embodiment, the image height (ImgH) of the fifth embodiment is larger than that of the first embodiment, and the longitudinal spherical aberration, field curvature aberration and distortion aberration of the fifth embodiment are better than those of the first embodiment.

[0158] Fig.26 is a schematic diagram of an optical imaging lens according to a sixth embodiment of the present invention, and Fig. 27 A to Fig. 27 D is a diagram of the longitudinal spherical aberration and various aberrations of the optical imaging lens of the sixth embodiment. Fig.26The sixth embodiment of the optical imaging lens 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows: the optical data, aspheric coefficients, and parameters between lenses 1, 2, 3, 4, 5, 6, 7, and 8 are more or less different. In addition, in this embodiment, the fourth lens 4 has a negative refractive power, the fifth lens 5 has a positive refractive power, the seventh lens 7 has a negative refractive power, and the eighth lens 8 has a positive refractive power; and, the circumferential region 454 of the object side surface 45 of the fourth lens 4 is a concave surface, the optical axis region 551 of the object side surface 55 of the fifth lens 5 is a convex surface, the optical axis region 661 of the image side surface 66 of the sixth lens 6 is a convex surface, the optical axis region 851 of the object side surface 85 of the eighth lens 8 is a convex surface, and the circumferential region 864 of the image side surface 86 of the eighth lens 8 is a concave surface. It should be noted here that in order to clearly display the drawings, Fig.26 The reference numerals of the optical axis area and the circumferential area similar to those in the first embodiment are omitted.

[0159] Detailed optical data of the optical imaging lens 10 of the sixth embodiment are as follows: Fig.28 As shown, the effective focal length (EFL) of the optical imaging lens 10 of the sixth embodiment is 5.610 mm, the half field of view (HFOV) is 39.156 degrees, the system length (TTL) is 8.022 mm, the aperture value (Fno) is 1.700, and the image height (ImgH) is 4.800 mm.

[0160] like Fig.29 As shown, the aspheric coefficients of the sixth embodiment from the object side surface 15 of the first lens 1 to the image side surface 86 of the eighth lens 8 in formula (1) are shown.

[0161] In addition, the relationship between the important parameters of the optical imaging lens 10 of the sixth embodiment is as follows: Figure 30 to Figure 31 shown.

[0162] The longitudinal spherical aberration diagram of the sixth embodiment is shown in FIG. Fig. 27 In A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±0.1 mm. Fig. 27 B and Fig. 27 In the two field curvature aberration diagrams of C, the field curvature aberrations of the three representative wavelengths in the entire field of view fall within ±0.18 mm. Fig. 27 The distortion diagram of D shows that the distortion of the sixth embodiment is maintained within the range of ±14%. This shows that compared with the existing optical imaging lens, the system length of the sixth embodiment can be shortened to about 8.022 mm under the conditions of an aperture value of 1.700 and an image height of 4.800 mm, and still provide good imaging quality and chromatic aberration performance.

[0163] From the above description, it can be known that the advantages of the sixth embodiment compared to the first embodiment are: the system length (TTL) of the sixth embodiment is shorter than that of the first embodiment, the thickness difference between the optical axis and the circumferential area of ​​the lens of the sixth embodiment is smaller than that of the first embodiment, and it is easy to manufacture and therefore has a higher yield.

[0164] Through the numerical control of the optical properties and parameters of the following lenses, designers can be assisted in designing optical imaging lenses with small aperture value, large image height, good optical performance, improved chromatic aberration and technically feasible:

[0165] In the embodiment of the present invention, when the first lens has a positive refractive power and the optical axis area of ​​the image side surface of the first lens is concave, the circumferential area of ​​the object side surface of the second lens is convex, and the circumferential area of ​​the image side surface of the third lens is convex, it can gather light at a large angle. In combination with the optical axis area of ​​the image side surface of the fifth lens being convex, the sixth lens having a negative refractive power, and the circumferential area of ​​the object side surface of the eighth lens being convex, the aberration caused by the first lens to the third lens can be corrected, so that the optical imaging lens has good imaging quality; when the lens material is further controlled to meet the conditional formula V3+V5+V7≦120.000, the chromatic aberration can be effectively improved and the resolution of the lens can be improved. Among them, the preferred range of V3+V5+V7 is 70.000≦V3+V5+V7≦120.000.

[0166] In the embodiment of the present invention, when the first lens has a positive refractive power, the optical axis area of ​​the image side surface of the first lens is a concave surface, and the circumferential area of ​​the image side surface of the third lens is a convex surface, it can gather light at a large angle. In combination with the optical axis area of ​​the image side surface of the fifth lens being a convex surface, the sixth lens having a negative refractive power, the circumferential area of ​​the object side surface of the seventh lens being a concave surface, and the circumferential area of ​​the object side surface of the eighth lens being a convex surface, the aberration and distortion caused by the first lens to the third lens at the edge of the imaging surface can be corrected, so that the optical imaging lens has good imaging quality; when the lens material is further controlled to meet the conditional formula: V3+V5+V7≦120.000, the chromatic aberration can be effectively improved and the resolution of the lens can be improved, wherein the preferred range of V3+V5+V7 is 70.000≦V3+V5+V7≦120.000.

[0167] In the embodiment of the present invention, when the first lens has a positive refractive power and the optical axis area of ​​the image side surface of the first lens is a concave surface, and the circumferential area of ​​the image side surface of the third lens is a convex surface, it can gather light at a large angle. In combination with the optical axis area of ​​the image side surface of the fifth lens being a convex surface, the sixth lens having a negative refractive power, the circumferential area of ​​the object side surface of the eighth lens being a convex surface, and the optical axis area of ​​the image side surface of the eighth lens being a concave surface, the aberration and distortion caused by the first lens to the third lens can be corrected, which is conducive to the imaging light being clearly focused on the imaging surface; when the lens material is further controlled to meet the conditional formula: V3+V5+V7≦120.000, the chromatic aberration can be effectively improved and the resolution of the lens can be improved, wherein the preferred range of V3+V5+V7 is 70.000≦V3+V5+V7≦120.000.

[0168] In the embodiment of the present invention, when the image height (ImgH) of the optical imaging lens satisfies the following relationship, the system image height can be effectively increased, the aperture value can be reduced, and the photosensitivity effect of the imaging lens can be increased:

[0169] ImgH / (BFL+Tmax)≧2.550, preferably 2.550≦ImgH / (BFL+Tmax)≦4.200;

[0170] (EFL+ImgH) / (Tmax+Tmin)≧8.800, preferably 8.800≦(EFL+ImgH) / (Tmax+Tmin)≦11.000.

[0171] In order to shorten the system length and ensure the imaging quality, while considering the difficulty of manufacturing, the air gap between lenses is reduced or the thickness of the lenses is appropriately shortened as a means. If the numerical limits of the following conditional expressions are met, the embodiments of the present invention can have a better configuration, and when they meet the better range, the aberration and distortion of the optical imaging lens can be improved.

[0172] (TTL+Tmin) / Tmax≦8.800, preferably 6.900≦(TTL+Tmin) / Tmax≦8.800;

[0173] (T2+T5) / T3≧2.100, preferably 2.100≦(T2+T5) / T3≦3.400;

[0174] TL / (G67+G78)≦7.000, preferably 4.000≦TL / (G67+G78)≦7.000;

[0175] ALT / (G56+T7)≦5.000, preferably 3.200≦ALT / (G56+T7)≦5.000;

[0176] AAG / (T1+T8)≦2.200, preferably 1.200≦AAG / (T1+T8)≦2.200;

[0177] (T4+G45+T5+T8) / BFL≧2.000, preferably 2.000≦(T4+G45+T5+T8) / BFL≦4.800;

[0178] (T1+T7) / T4≧2.100, preferably 2.100≦(T1+T7) / T4≦3.000;

[0179] TL / (G12+BFL)≧6.500, preferably 6.500≦TL / (G12+BFL)≦16.900;

[0180] ALT / (G45+G67+G78)≦3.500, preferably 2.100≦ALT / (G45+G67+G78)≦3.500;

[0181] AAG / (T2+T6+T7)≦2.400, preferably 1.450≦AAG / (T2+T6+T7)≦2.400;

[0182] TTL / (T1+G23)≦6.100, preferably 4.100≦TTL / (T1+G23)≦6.100;

[0183] (G78+T8) / (G12+T2)≧3.000, preferably 3.000≦(G78+T8) / (G12+T2)≦8.800;

[0184] TL / (G45+G56)≦12.550, preferably 7.600≦TL / (G45+G56)≦12.550;

[0185] BFL / (G23+G34)≦1.550, preferably 0.560≦BFL / (G23+G34)≦1.550;

[0186] EFL / (T3+T6)≧7.500, preferably 7.500≦EFL / (T3+T6)≦11.300.

[0187] In addition, any combination of parameters of the embodiment may be selected to increase lens restrictions, so as to facilitate the lens design of the same architecture of the present invention.

[0188] In view of the unpredictability of optical system design, under the framework of the present invention, meeting the above conditions can better enable the present invention to reduce the aperture value, increase the image height, improve chromatic aberration and enhance the image quality, or improve the assembly yield to improve the shortcomings of the prior art. The lens of the embodiment of the present invention uses plastic material to reduce the weight of the lens and save costs.

[0189] The numerical ranges obtained by the combination ratio relationship of the optical parameters disclosed in various embodiments of the present invention and including the maximum and minimum values ​​can all be implemented accordingly.

[0190] The contents disclosed in each embodiment of the present invention include but are not limited to optical parameters such as focal length, lens thickness, and Abbe number. For example, the present invention discloses an optical parameter A and an optical parameter B in each embodiment, wherein the ranges covered by these optical parameters, the comparison relationship between the optical parameters, and the conditional ranges covered by multiple embodiments are specifically explained as follows:

[0191] (1) The range of optical parameters, such as α 2 ≦A≦α 1 or β 2 ≦B≦β 1 , α 1 is the maximum value of the optical parameter A in multiple embodiments, α 2 is the minimum value of the optical parameter A in multiple embodiments, β 1 is the maximum value of the optical parameter B in multiple embodiments, β 2 is the minimum value of the optical parameter B in multiple embodiments.

[0192] (2) The comparative relationship between optical parameters, for example: A is greater than B or A is less than B.

[0193] (3) The conditional range covered by multiple embodiments, specifically, the combination relationship or proportional relationship obtained by possible calculation of multiple optical parameters of the same embodiment, these relationships are defined as E. E can be, for example: A+B or AB or A / B or A*B or (A*B) 1 / 2 , and E satisfies the condition E≦γ 1 or E ≧ γ 2 or γ 2 ≦E≦γ 1 , γ 1 and γ 2 is the value obtained by calculating the optical parameter A and the optical parameter B of the same embodiment, and γ 1 is the maximum value among multiple embodiments of the present invention, γ 2 It is the minimum value among the multiple embodiments of the present invention.

[0194] The ranges covered by the above optical parameters, the comparison relationship between the optical parameters, and the maximum value, minimum value, and numerical range within the maximum value and minimum value of the conditional expressions are all features that can be implemented by the present invention, and all belong to the scope disclosed by the present invention. The above is only an example and should not be limited to this.

[0195] All embodiments of the present invention can be implemented, and some feature combinations can be extracted from the same embodiment. Compared with the prior art, the feature combination can also achieve unexpected effects of the present case. The feature combination includes but is not limited to the combination of features such as face shape, refractive index and conditional formula. The disclosure of the embodiments of the present invention is a specific embodiment to illustrate the principles of the present invention, and the present invention should not be limited to the disclosed embodiments. In other words, the embodiments and their drawings are only for demonstration of the present invention and are not limited thereto.

Claims

1. An optical imaging lens, comprising, in order from an object side to an image side along an optical axis, 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, wherein each of the first lens to the eighth lens comprises an object-side surface facing the object side and allowing imaging light to pass therethrough, and an image-side surface facing the image side and allowing imaging light to pass therethrough; characterized in that: The first lens has a positive refractive power, an optical axis region of the image side surface of the first lens is a concave surface, an optical axis region of the object side surface of the first lens is a convex surface, a circumferential region of the object side surface of the first lens is a convex surface, and a circumferential region of the image side surface of the first lens is a concave surface; A circumferential region of the object side surface of the second lens is a convex surface, an optical axis region of the object side surface of the second lens is a convex surface, an optical axis region of the image side surface of the second lens is a concave surface, and a circumferential region of the image side surface of the second lens is a concave surface; A circumferential area of ​​the image-side surface of the third lens is a convex surface, an optical axis area of ​​the object-side surface of the third lens is a convex surface, a circumferential area of ​​the object-side surface of the third lens is a concave surface, and an optical axis area of ​​the image-side surface of the third lens is a concave surface; An optical axis region of the object side surface of the fourth lens is a concave surface, an optical axis region of the image side surface of the fourth lens is a convex surface, and a circumferential region of the image side surface of the fourth lens is a convex surface; An optical axis region of the image-side surface of the fifth lens is a convex surface, a circumferential region of the object-side surface of the fifth lens is a concave surface, and a circumferential region of the image-side surface of the fifth lens is a convex surface; The sixth lens has a negative refractive power, an optical axis region of the object side surface of the sixth lens is a concave surface, a circumferential region of the object side surface of the sixth lens is a concave surface, and a circumferential region of the image side surface of the sixth lens is a convex surface; An optical axis region of the object side surface of the seventh lens is a convex surface, a circumferential region of the object side surface of the seventh lens is a concave surface, an optical axis region of the image side surface of the seventh lens is a concave surface, and a circumferential region of the image side surface of the seventh lens is a convex surface; A circumferential area of ​​the object-side surface of the eighth lens is a convex surface, and an optical axis area of ​​the image-side surface of the eighth lens is a concave surface; The optical imaging lens has only the eight lenses mentioned above, and the optical imaging lens satisfies the following conditional formula: V3+V5+V7≦120.000, (T2+T5) / T3≧2.100, TTL / (T1+G23)≦6.100 and 3.200≦ALT / (G56+T7)≦5.000; Wherein, V3 is the Abbe number of the third lens, V5 is the Abbe number of the fifth lens, V7 is the Abbe number of the seventh lens, T2 is the thickness of the second lens on the optical axis, T3 is the thickness of the third lens on the optical axis, T5 is the thickness of the fifth lens on the optical axis, TTL is the distance from the object side surface of the first lens to an imaging surface on the optical axis, T1 is the thickness of the first lens on the optical axis, and G23 is the air gap between the second lens and the third lens on the optical axis, ALT is the sum of the thicknesses of eight lenses from the first lens to the eighth lens on the optical axis, G56 is the air gap between the fifth lens and the sixth lens on the optical axis, and T7 is the thickness of the seventh lens on the optical axis.

2. The optical imaging lens according to claim 1, wherein: The optical imaging lens further satisfies: TL / (G67+G78)≦7.000, wherein TL is the distance from the object side surface of the first lens to the image side surface of the eighth lens on the optical axis, G67 is the air gap between the sixth lens and the seventh lens on the optical axis, and G78 is the air gap between the seventh lens and the eighth lens on the optical axis.

3. The optical imaging lens according to claim 1, wherein: The optical imaging lens further satisfies: ImgH / (BFL+Tmax)≧2.550, wherein ImgH is the image height of the optical imaging lens, BFL is the distance from the image side surface of the eighth lens to an imaging plane on the optical axis, and Tmax is the maximum value of the eight lens thicknesses from the first lens to the eighth lens on the optical axis.

4. The optical imaging lens according to claim 1, wherein: The optical imaging lens further satisfies: AAG / (T1+T8)≦2.200, wherein AAG is the sum of seven air gaps from the first lens to the eighth lens on the optical axis, and T8 is the thickness of the eighth lens on the optical axis.

5. The optical imaging lens according to claim 1, wherein: The optical imaging lens further satisfies: (T4+G45+T5+T8) / BFL≧2.000, wherein T4 is the thickness of the fourth lens on the optical axis, T8 is the thickness of the eighth lens on the optical axis, G45 is the air gap between the fourth lens and the fifth lens on the optical axis, and BFL is the distance from the image side surface of the eighth lens to an imaging surface on the optical axis.

6. The optical imaging lens according to claim 1, wherein: The optical imaging lens further satisfies: (T1+T7) / T4≧2.100, wherein T4 is the thickness of the fourth lens on the optical axis.

7. The optical imaging lens according to claim 1, wherein: The optical imaging lens further satisfies: TL / (G12+BFL)≧6.500, wherein TL is the distance from the object side surface of the first lens to the image side surface of the eighth lens on the optical axis, G12 is the air gap between the first lens and the second lens on the optical axis, and BFL is the distance from the image side surface of the eighth lens to an imaging plane on the optical axis.

8. The optical imaging lens according to claim 1, wherein: The optical imaging lens further satisfies: (EFL+ImgH) / (Tmax+Tmin)≧8.800, wherein EFL is the effective focal length of the optical imaging lens, ImgH is the image height of the optical imaging lens, Tmax is the maximum value of the thickness of eight lenses from the first lens to the eighth lens on the optical axis, and Tmin is the minimum value of the thickness of eight lenses from the first lens to the eighth lens on the optical axis.

9. The optical imaging lens according to claim 1, wherein: The optical imaging lens further satisfies: ALT / (G45+G67+G78)≦3.500, wherein G45 is the air gap between the fourth lens and the fifth lens on the optical axis, G67 is the air gap between the sixth lens and the seventh lens on the optical axis, and G78 is the air gap between the seventh lens and the eighth lens on the optical axis.

10. The optical imaging lens according to claim 1, wherein: The optical imaging lens further satisfies: AAG / (T2+T6+T7)≦2.400, wherein AAG is the sum of seven air gaps from the first lens to the eighth lens on the optical axis, and T6 is the thickness of the sixth lens on the optical axis.

11. The optical imaging lens according to claim 1, wherein: The optical imaging lens further satisfies: (G78+T8) / (G12+T2)≧3.000, wherein T8 is the thickness of the eighth lens on the optical axis, G12 is the air gap between the first lens and the second lens on the optical axis, and G78 is the air gap between the seventh lens and the eighth lens on the optical axis.

12. The optical imaging lens according to claim 1, wherein: The optical imaging lens further satisfies: TL / (G45+G56)≦12.550, wherein TL is the distance from the object side surface of the first lens to the image side surface of the eighth lens on the optical axis, and G45 is the air gap between the fourth lens and the fifth lens on the optical axis.

13. The optical imaging lens according to claim 1, wherein: The optical imaging lens further satisfies: (TTL+Tmin) / Tmax≦8.800, wherein Tmin is the minimum thickness of eight lenses from the first lens to the eighth lens on the optical axis, and Tmax is the maximum thickness of eight lenses from the first lens to the eighth lens on the optical axis.

14. The optical imaging lens according to claim 1, wherein: The optical imaging lens further satisfies: BFL / (G23+G34)≦1.550, wherein BFL is the distance from the image side surface of the eighth lens to an imaging surface on the optical axis, and G34 is the air gap between the third lens and the fourth lens on the optical axis.

15. The optical imaging lens according to claim 1, wherein: The optical imaging lens further satisfies: EFL / (T3+T6)≧7.500, wherein EFL is the effective focal length of the optical imaging lens, and T6 is the thickness of the sixth lens on the optical axis.

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