Optical imaging lens

Abstract

The present invention discloses an optical imaging lens, which includes 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 in order from the object side to the image side along the optical axis, wherein the first lens to the eighth lens each include an object side surface facing the object side and allowing imaging light to pass through, and an image side surface facing the image side and allowing imaging light to pass through. The second lens has a negative refractive power. The optical axis region of the object side surface of the third lens is a concave surface. The optical axis region of the image side surface of the fourth lens is a concave surface. The optical axis region of the object side surface of the fifth lens is a concave surface. The seventh lens has a positive refractive power. The first lens has a positive refractive power or the eighth lens has a negative refractive power. The optical imaging lens has only the above eight lenses and satisfies the following conditional formula: D52t81 / D41t52≧1.950. It has the characteristics of a small aperture value, a large image height and excellent imaging quality.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging, and in particular 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 object of the present invention is to provide an optical imaging lens which can provide a lens with a small aperture value, a large image height and excellent imaging quality.

[0004] One embodiment of the present invention provides an optical imaging lens, which includes 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 in order from the object side to the image side along the optical axis, wherein the first lens to the eighth lens each include an object side surface facing the object side and allowing the imaging light to pass through, and an image side surface facing the image side and allowing the imaging light to pass through. The second lens has a negative refractive power. The optical axis area of ​​the object side surface of the third lens is a concave surface. The optical axis area of ​​the image side surface of the fourth lens is a concave surface. The optical axis area of ​​the object side surface of the fifth lens is a concave surface. The seventh lens has a positive refractive power. The first lens has a positive refractive power or the eighth lens has a negative refractive power. The optical imaging lens has only the above eight lenses and satisfies the following conditional formula: D52t81 / D41t52≧1.950.

[0005] One embodiment of the present invention provides an optical imaging lens, which includes 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 in order from the object side to the image side along the optical axis, wherein the first lens to the eighth lens each include an object side surface facing the object side and allowing the imaging light to pass through, and an image side surface facing the image side and allowing the imaging light to pass through. The second lens has a negative refractive power. The circumferential area of ​​the object side surface of the third lens is a concave surface. The optical axis area of ​​the image side surface of the fourth lens is a concave surface. The optical axis area of ​​the object side surface of the fifth lens is a concave surface. The seventh lens has a positive refractive power. The first lens has a positive refractive power or the eighth lens has a negative refractive power. The optical imaging lens has only the above eight lenses and satisfies the following conditional formula: D52t81 / D41t52≧3.000.

[0006] An embodiment of the present invention provides an optical imaging lens, which includes 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 in order from the object side to the image side along the optical axis, wherein the first lens to the eighth lens each include an object side surface facing the object side and allowing the imaging light to pass therethrough and an image side surface facing the image side and allowing the imaging light to pass therethrough. The second lens has a negative refractive power. 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 fourth lens is a concave surface. The optical axis region of the object side surface of the fifth lens is a concave surface. The seventh lens has a positive refractive power. The first lens has a positive refractive power or the eighth lens has a negative refractive power. The optical axis region of the object side surface of the eighth lens is a concave surface. The optical imaging lens has only the above eight lenses and satisfies the following conditional formula: D52t81 / D41t52≧3.000.

[0007] The above D52t81 is the distance from the image side surface of the fifth lens to the object side surface of the eighth lens on the optical axis, and D41t52 is the distance from the object side surface of the fourth lens to the image side surface of the fifth lens on the optical axis.

[0008] In the optical imaging lens of the present invention, the embodiment may also selectively satisfy any of the following conditions:

[0009] V3+V4+V5≦125,000,

[0010] ImgH / Fno≧3.750mm,

[0011] (T7+G78+T8) / T4≧7.950,

[0012] AAG / ALT≧0.850,

[0013] (T1+G12+T2+G23+T3) / D41t52≧3.300,

[0014] Tmax / BFL≧1.000,

[0015] V2+V6+V7≦125.000,

[0016] (EFL+BFL) / Fno≧4.200mm,

[0017] (T2+G23+T3) / T6≧2.950,

[0018] EFL / (G45+T5)≧11.950,

[0019] (G23+G34) / G56≦2.000,

[0020] Tmax / Tmin≧4.000,

[0021] (V6+V7+V8) / V5≦5.000,

[0022] TL / Fno≧4.000mm,

[0023] (T6+G67+T7) / (T3+G34)≧1.950,

[0024] TTL / (T4+T6)≧12.000,

[0025] (ALT+BFL) / AAG≦1.500.

[0026] Wherein V2 is the Abbe number of the second lens, V3 is the Abbe number of the third lens, V4 is the Abbe number of the fourth lens, V5 is the Abbe number of the fifth lens, V6 is the Abbe number of the sixth lens, V7 is the Abbe number of the seventh lens, and V8 is the Abbe number of the eighth lens.

[0027] T1 is the thickness of the first lens on the optical axis, T2 is the thickness of the second lens on the optical axis, T3 is the thickness of the third lens on the optical axis, T4 is the thickness of the fourth lens on the optical axis, T5 is the thickness of the fifth lens on the optical axis, T6 is the thickness of the sixth lens on the optical axis, T7 is the thickness of the seventh lens on the optical axis, and T8 is the thickness of the eighth lens on the optical axis.

[0028] G12 is the air gap between the first lens and the second lens on the optical axis, G23 is the air gap between the second lens and the third lens on the optical axis. G34 is the air gap between the third lens and the fourth lens on the optical axis, G45 is the air gap between the fourth lens and the fifth lens on the optical axis, G56 is the air gap between the fifth lens and the sixth lens on the optical axis. G67 is the air gap between the sixth lens and the seventh lens on the optical axis. G78 is the air gap between the seventh lens and the eighth lens on the optical axis.

[0029] ImgH is the image height of the optical imaging lens, and Fno is the aperture value of the optical imaging lens. AAG is the sum of the seven air gaps on the optical axis from the first lens to the eighth lens, ALT is the sum of the eight lens thicknesses on the optical axis from the first lens to the eighth lens, and BFL is the distance from the image side of the eighth lens to the imaging plane on the optical axis. EFL is the effective focal length of the optical imaging lens, Tmax is the maximum value of the eight lens thicknesses on the optical axis from the first lens to the eighth lens, and Tmin is the minimum value of the eight lens thicknesses on the optical axis from the first lens to the eighth lens. TL is the distance on the optical axis from the object side of the first lens to the image side of the eighth lens, and TTL is the distance on the optical axis from the object side of the first lens to the imaging plane.

[0030] Based on the above, the beneficial effect of the optical imaging lens of the embodiment of the present invention is that by satisfying the above-mentioned concave and convex surface arrangement design of the lens, the refractive index conditions and the design satisfying the above-mentioned conditional formula, the optical imaging lens can simultaneously provide a small aperture value, a large image height and satisfactory imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram illustrating the surface structure of a lens.

[0032] Figure 2 It is a schematic diagram illustrating the concave-convex structure of a lens surface and the focus of light.

[0033] Figure 3 is a schematic diagram illustrating the surface structure of a lens of Example 1.

[0034] Figure 4 is a schematic diagram illustrating the surface structure of a lens of Example 2.

[0035] Figure 5 is a schematic diagram illustrating the surface structure of a lens of Example 3.

[0036] Figure 6 It is a schematic diagram of an optical imaging lens according to a first embodiment of the present invention.

[0037] Figure 7 Graphs showing longitudinal spherical aberration and various aberrations of the optical imaging lens of the first embodiment.

[0038] Figure 8 It is a table diagram of detailed optical data of the optical imaging lens of the first embodiment of the present invention.

[0039] Fig. 9 It is a table diagram of aspherical parameters of the optical imaging lens of the first embodiment of the present invention.

[0040] Fig.10 FIG. 4 is a schematic diagram of an optical imaging lens according to a second embodiment of the present invention.

[0041] Fig.11 Graphs showing longitudinal spherical aberration and various aberrations of the optical imaging lens of the second embodiment.

[0042] Fig.12 It is a table diagram of detailed optical data of the optical imaging lens of the second embodiment of the present invention.

[0043] Fig.13 It is a table diagram of aspherical parameters of the optical imaging lens of the second embodiment of the present invention.

[0044] Fig.14 FIG. 4 is a schematic diagram of an optical imaging lens according to a third embodiment of the present invention.

[0045] Fig.15 Graphs showing longitudinal spherical aberration and various aberrations of the optical imaging lens of the third embodiment.

[0046] Fig.16 It is a table diagram of detailed optical data of the optical imaging lens of the third embodiment of the present invention.

[0047] Fig.17 It is a table diagram of aspherical parameters of the optical imaging lens of the third embodiment of the present invention.

[0048] Fig.18 FIG. 4 is a schematic diagram of an optical imaging lens according to a fourth embodiment of the present invention.

[0049] Fig.19 Graphs showing longitudinal spherical aberration and various aberrations of the optical imaging lens of the fourth embodiment.

[0050] Fig. 20 It is a table diagram of detailed optical data of the optical imaging lens of the fourth embodiment of the present invention.

[0051] Fig.21 It is a table diagram of aspherical parameters of the optical imaging lens of the fourth embodiment of the present invention.

[0052] Fig. 22 FIG. 4 is a schematic diagram of an optical imaging lens according to a fifth embodiment of the present invention.

[0053] Fig.23 Graphs showing longitudinal spherical aberration and various aberrations of the optical imaging lens of the fifth embodiment.

[0054] Fig.24 It is a table diagram of detailed optical data of the optical imaging lens of the fifth embodiment of the present invention.

[0055] Fig.25 It is a table diagram of aspherical parameters of the optical imaging lens of the fifth embodiment of the present invention.

[0056] Fig.26 FIG. 4 is a schematic diagram of an optical imaging lens according to a sixth embodiment of the present invention.

[0057] Fig. 27 Graphs showing longitudinal spherical aberration and various aberrations of the optical imaging lens of the sixth embodiment.

[0058] Fig.28 It is a table diagram of detailed optical data of the optical imaging lens of the sixth embodiment of the present invention.

[0059] Fig.29 It is a table diagram of aspherical parameters of the optical imaging lens of the sixth embodiment of the present invention.

[0060] Fig.30FIG. 4 is a schematic diagram of an optical imaging lens according to a seventh embodiment of the present invention.

[0061] Fig.31 Graphs showing longitudinal spherical aberration and various aberrations of the optical imaging lens of the seventh embodiment.

[0062] Fig.32 It is a table diagram of detailed optical data of the optical imaging lens of the seventh embodiment of the present invention.

[0063] Fig.33 It is a table diagram of aspherical parameters of the optical imaging lens of the seventh embodiment of the present invention.

[0064] Fig.34 is a schematic diagram of an optical imaging lens according to an eighth embodiment of the present invention.

[0065] Fig.35 Graphs showing longitudinal spherical aberration and various aberrations of the optical imaging lens of the eighth embodiment.

[0066] Fig.36 It is a table diagram of detailed optical data of the optical imaging lens of the eighth embodiment of the present invention.

[0067] Fig.37 It is a table diagram of aspherical parameters of the optical imaging lens of the eighth embodiment of the present invention.

[0068] Fig.38 is a schematic diagram of an optical imaging lens according to a ninth embodiment of the present invention.

[0069] Fig.39 Graphs showing longitudinal spherical aberration and various aberrations of the optical imaging lens of the ninth embodiment.

[0070] Fig.40 It is a table diagram of detailed optical data of the optical imaging lens of the ninth embodiment of the present invention.

[0071] Fig.41 It is a table diagram of aspherical parameters of the optical imaging lens of the ninth embodiment of the present invention.

[0072] Fig.42 FIG. 1 is a schematic diagram of an optical imaging lens according to a tenth embodiment of the present invention.

[0073] Fig.43 Graphs showing longitudinal spherical aberration and various aberrations of the optical imaging lens of the tenth embodiment.

[0074] Fig.44 It is a table diagram of detailed optical data of the optical imaging lens according to the tenth embodiment of the present invention.

[0075] Fig.45 It is a table diagram of aspherical parameters of the optical imaging lens according to the tenth embodiment of the present invention.

[0076] Figure 46 to Figure 47 It is a numerical table diagram of important parameters and their relationship expressions of the optical imaging lenses of the first to tenth embodiments of the present invention. DETAILED DESCRIPTION

[0077] Before describing the present invention in detail, the symbols in the accompanying drawings are first clearly indicated: 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; 10: optical imaging lens; 11, 21, 31, 41, 51, 52, 71, 81, 110, 410, 510, F1: object side; 12, 22, 32, 42, 52, 62, 72, 82, 120, 320, F2: image side; 99: imaging surface; 100, 200, 300, 400, 500: lenses; 130: assembly unit; 113, 123, 213, 223, 313, 323, 413 , 423, 513, 523, 613, 623, 713, 723, 813, 823, Z1: optical axis area; 114, 124, 214, 224, 314, 324, 414, 424, 514, 524, 614, 624, 714, 724, 814, 824, Z2: circular area; 211, 212: parallel light rays; A1: object side; A2: image side; CP: center point; CP1: first center point; CP2: second center point; EL: extension line; F: filter; I: optical axis; Lm: marginal light; Lc: main light; M, R: intersection point; OB: optical boundary; TP1: first transition point; TP2: second transition point; Z3: relay area.

[0078] 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.

[0079] The optical system of this 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-field of view (HFOV) angle relative to the optical axis. The imaging light is imaged on the imaging plane through the optical system. The phrase "a lens has a positive refractive power (or a negative refractive power)" refers to the paraxial refractive power of the lens calculated by Gaussian optical theory being positive (or negative). The "object side (or image side) of the lens" is defined as a specific range where the imaging light passes 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 1The 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.

[0080] Figure 1 is 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 point 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 with 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). Figure 4 as shown) and the Nth conversion point (farthest from the optical axis I).

[0081] 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.

[0082] 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.

[0083] In addition, see Figure 1The 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.

[0084] 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.

[0085] 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 the focus of a light ray parallel to the optical axis located on the object side or image side of the lens. The terms “a region is convex (or concave)”, “a region is convex (or concave)” or “a convex (or concave) region” described in this specification can be used interchangeably.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] Figure 5is 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 5 The 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.

[0092] 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 the longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the first embodiment. Please refer to Figure 6 The optical imaging lens 10 of the first embodiment of the present invention includes 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 F in order from the object side A1 to the image side A2 along an optical axis I of the optical imaging lens 10, wherein an aperture O is disposed on the object side surface 11 of the first lens 1. When light emitted by an object to be photographed enters the optical imaging lens 10 and passes through the aperture O, 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 F, a clear image is formed on an image plane 99. The filter F is disposed between the image side surface 82 of the eighth lens 8 and the image plane 99. It is additionally explained 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. In one embodiment, the filter F may be an infrared cut filter (IR Cut Filter), but the present invention is not limited thereto.

[0093] 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 F of the optical imaging lens 10 each have an object-side surface 11, 21, 31, 41, 51, 61, 71, 81, F1 facing the object side A1 and allowing imaging light to pass through, and an image-side surface 12, 22, 32, 42, 52, 62, 72, 82, F2 facing the image side A2 and allowing imaging light to pass through.

[0094] 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 113 of the object side surface 11 of the first lens 1 is a convex surface, and its circumferential region 114 is a convex surface. The optical axis region 123 of the image side surface 12 of the first lens 1 is a concave surface, and its circumferential region 124 is a concave surface. In the present embodiment, the object side surface 11 and the image side surface 12 of the first lens 1 are both aspheric surfaces, but the present invention is not limited thereto.

[0095] 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 213 of the object side surface 21 of the second lens 2 is a convex surface, and its circumferential region 214 is a convex surface. The optical axis region 223 of the image side surface 22 of the second lens 2 is a concave surface, and its circumferential region 224 is a concave surface. In the present embodiment, the object side surface 21 and the image side surface 22 of the second lens 2 are both aspherical surfaces, but the present invention is not limited thereto.

[0096] The third lens 3 has a positive refractive power. The material of the third lens 3 is plastic, but the present invention is not limited thereto. The optical axis region 313 of the object side surface 31 of the third lens 3 is a concave surface, and its circumferential region 314 is a concave surface. The optical axis region 323 of the image side surface 32 of the third lens 3 is a convex surface, and its circumferential region 324 is a convex surface. In the present embodiment, the object side surface 31 and the image side surface 32 of the third lens 3 are both aspherical surfaces, but the present invention is not limited thereto.

[0097] The fourth lens 4 has a negative refractive power. The material of the fourth lens 4 is plastic, but the present invention is not limited thereto. The optical axis region 413 of the object side surface 41 of the fourth lens 4 is a convex surface, and its circumferential region 414 is a concave surface. The optical axis region 423 of the image side surface 42 of the fourth lens 4 is a concave surface, and its circumferential region 424 is a convex surface. In the present embodiment, the object side surface 41 and the image side surface 42 of the fourth lens 4 are both aspherical surfaces, but the present invention is not limited thereto.

[0098] The fifth lens 5 has a positive refractive power. The material of the fifth lens 5 is plastic, but the present invention is not limited thereto. The optical axis region 513 of the object side surface 51 of the fifth lens 5 is a concave surface, and its circumferential region 514 is a concave surface. The optical axis region 523 of the image side surface 52 of the fifth lens 5 is a convex surface, and its circumferential region 524 is a convex surface. In the present embodiment, the object side surface 51 and the image side surface 52 of the fifth lens 5 are both aspherical surfaces, but the present invention is not limited thereto.

[0099] The sixth lens 6 has a positive refractive power. The sixth lens 6 is made of plastic, but the present invention is not limited thereto. The optical axis region 613 of the object side surface 61 of the sixth lens 6 is a concave surface, and its circumferential region 614 is a concave surface. The optical axis region 623 of the image side surface 62 of the sixth lens 6 is a convex surface, and its circumferential region 624 is a convex surface. In the present embodiment, the object side surface 61 and the image side surface 62 of the sixth lens 6 are both aspherical surfaces, but the present invention is not limited thereto.

[0100] 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 713 of the object side surface 71 of the seventh lens 7 is a convex surface, and its circumferential region 714 is a concave surface. The optical axis region 723 of the image side surface 72 of the seventh lens 7 is a concave surface, and its circumferential region 724 is a convex surface. In the present embodiment, the object side surface 71 and the image side surface 72 of the seventh lens 7 are both aspherical surfaces, but the present invention is not limited thereto.

[0101] 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 813 of the object side surface 81 of the eighth lens 8 is a concave surface, and its circumferential region 814 is a concave surface. The optical axis region 823 of the image side surface 82 of the eighth lens 8 is a concave surface, and its circumferential region 824 is a convex surface. In the present embodiment, the object side surface 81 and the image side surface 82 of the eighth lens 8 are both aspherical surfaces, but the present invention is not limited thereto.

[0102] In this embodiment, the optical imaging lens system 10 only includes the eight lenses mentioned above.

[0103] 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 10 of the first embodiment is 7.269 millimeters (mm), the half field of view (HFOV) is 41.304 degrees, the aperture value (F-number, Fno) is 1.700, the system length is 9.096 millimeters, and the image height (ImgH) is 7.200 millimeters, wherein the system length refers to the distance from the object side surface 11 of the first lens 1 to the imaging surface 99 on the optical axis I.

[0104] In addition, in this embodiment, object-side surfaces 11, 21, 31, 41, 51, 52, 71, 81 and image-side surfaces 12, 22, 32, 42, 52, 62, 72, 82 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, a total of 16 surfaces, are aspherical surfaces, wherein the object-side surfaces 11, 21, 31, 41, 51, 52, 71, 81 and image-side surfaces 12, 22, 32, 42, 52, 62, 72, 82 are general even asphere surfaces. These aspherical surfaces are defined according to the following formulas:

[0105]

[0106] Where: R: radius of curvature of the lens surface near the optical axis I; Z: depth of the aspheric surface (the vertical distance between the point on the aspheric surface that is Y away from the optical axis I and the tangent plane tangent to the vertex on the aspheric optical axis I); Y: distance between the point on the aspheric curve and the optical axis I; K: conic constant; a i : i-th order aspheric coefficient.

[0107] The aspheric coefficients of the various items from the object side surface 11 of the first lens 1 to the image side surface 82 of the eighth lens 8 in formula (1) are as follows: Fig. 9 As shown. Among them, Fig. 9 The column number 11 in the middle represents the aspheric coefficient of the object side surface 11 of the first lens 1, and the same applies to the other columns. In this embodiment and the following embodiments, the second-order aspheric coefficient a2 is 0.

[0108] In addition, the relationship between the important parameters of the optical imaging lens 10 of the first embodiment is as follows: Fig.46 shown.

[0109] in,

[0110] T1 is the thickness of the first lens 1 on the optical axis I;

[0111] T2 is the thickness of the second lens 2 on the optical axis I;

[0112] T3 is the thickness of the third lens 3 on the optical axis I;

[0113] T4 is the thickness of the fourth lens 4 on the optical axis I;

[0114] T5 is the thickness of the fifth lens 5 on the optical axis I;

[0115] T6 is the thickness of the sixth lens 6 on the optical axis I;

[0116] T7 is the thickness of the seventh lens 7 on the optical axis I;

[0117] T8 is the thickness of the eighth lens 8 on the optical axis I;

[0118] TF is the thickness of the filter F on the optical axis I;

[0119] 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 12 of the first lens 1 to the object side surface 21 of the second lens 2 on the optical axis I;

[0120] 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 22 of the second lens 2 to the object side surface 31 of the third lens 3 on the optical axis I;

[0121] 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 32 of the third lens 3 to the object side surface 41 of the fourth lens 4 on the optical axis I;

[0122] 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 between the image side surface 42 of the fourth lens 4 and the object side surface 51 of the fifth lens 5 on the optical axis I;

[0123] 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 52 of the fifth lens 5 and the object side surface 61 of the sixth lens 6 on the optical axis I;

[0124] 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 62 of the sixth lens 6 and the object side surface 71 of the seventh lens 7 on the optical axis I;

[0125] 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 72 of the seventh lens 7 and the object side surface 81 of the eighth lens 8 on the optical axis I;

[0126] G8F is the air gap between the eighth lens 8 and the filter F on the optical axis I, and is also the distance from the image side surface 82 of the eighth lens 8 to the object side surface F1 of the filter F on the optical axis I;

[0127] GFP is the air gap between the filter F and the imaging surface 99 on the optical axis I, and is also the distance from the image side surface F2 of the filter F to the imaging surface 99 on the optical axis I;

[0128] 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 air gaps G12, G23, G34, G45, G56, G67 and G78;

[0129] 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 the thicknesses T1, T2, T3, T4, T5, T6, T7 and T8;

[0130] Tmax is the maximum value of the eight lens thicknesses of the first lens 1 to the eighth lens 8 on the optical axis I, that is, the maximum value among T1, T2, T3, T4, T5, T6, T7 and T8;

[0131] Tmin is the minimum value of the eight lens thicknesses of the first lens 1 to the eighth lens 8 on the optical axis I, that is, the minimum value among T1, T2, T3, T4, T5, T6, T7 and T8;

[0132] 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;

[0133] D41t52 is the distance from the object side surface 41 of the fourth lens 4 to the image side surface 52 of the fifth lens 5 on the optical axis I, that is, the sum of T4, G45, and T5;

[0134] D52t81 is the distance from the image side surface 52 of the fifth lens 5 to the object side surface 81 of the eighth lens 8 on the optical axis I, that is, the sum of G56, T6, G67, T7, and G78;

[0135] TL is the distance between the object-side surface 11 of the first lens 1 and the image-side surface 82 of the eighth lens 8 on the optical axis I;

[0136] TTL is the distance from the object side surface 11 of the first lens 1 to the imaging surface 99 on the optical axis I;

[0137] BFL is the distance from the image side surface 82 of the eighth lens 8 to the imaging surface 99 on the optical axis I, that is, the sum of G8F, TF, and GFP;

[0138] EFL is the effective focal length of the optical imaging lens 10;

[0139] HFOV is the half viewing angle of the optical imaging lens 10;

[0140] ImgH is the image height of the optical imaging lens 10; and

[0141] Fno is the aperture value of the optical imaging lens 10 .

[0142] In addition, define:

[0143] f1 is the focal length of the first lens 1;

[0144] f2 is the focal length of the second lens 2;

[0145] f3 is the focal length of the third lens 3;

[0146] f4 is the focal length of the fourth lens 4;

[0147] f5 is the focal length of the fifth lens 5;

[0148] f6 is the focal length of the sixth lens 6;

[0149] f7 is the focal length of the seventh lens 7;

[0150] f8 is the focal length of the eighth lens 8;

[0151] n1 is the refractive index of the first lens 1;

[0152] n2 is the refractive index of the second lens 2;

[0153] n3 is the refractive index of the third lens 3;

[0154] n4 is the refractive index of the fourth lens 4;

[0155] n5 is the refractive index of the fifth lens 5;

[0156] n6 is the refractive index of the sixth lens 6;

[0157] n7 is the refractive index of the seventh lens 7;

[0158] n8 is the refractive index of the eighth lens 8;

[0159] V1 is the Abbe number of the first lens 1, which may also be called the dispersion coefficient;

[0160] V2 is the Abbe number of the second lens 2;

[0161] V3 is the Abbe number of the third lens 3;

[0162] V4 is the Abbe number of the fourth lens 4;

[0163] V5 is the Abbe number of the fifth lens 5;

[0164] V6 is the Abbe number of the sixth lens 6;

[0165] V7 is the Abbe number of the seventh lens 7; and

[0166] V8 is the Abbe number of the eighth lens 8.

[0167] 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 470nm, 555nm and 650nm. 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. The longitudinal spherical aberration of the first embodiment is as follows: Figure 7 As shown in 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 ±0.025 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.

[0168] exist Figure 7 B and Figure 7 In the two field curvature aberration diagrams of C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±0.09 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 ±14%, indicating that the distortion of the first embodiment meets the imaging quality requirements of the optical system. This shows that compared with the existing optical lens, the first embodiment can still provide good imaging quality under the condition that the system length has been shortened to 9.096 mm. Therefore, the first embodiment can reduce the aperture value, increase the image height and meet the imaging quality while maintaining good optical performance.

[0169] 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 the longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the second embodiment. Please refer to Fig.10 , a 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 the 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.10 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0170] Detailed optical data of the optical imaging lens 10 of the second embodiment are as follows: Fig.12 As shown, the effective focal length of the optical imaging lens 10 of the second embodiment is 7.189 mm, the half field of view (HFOV) is 41.510 degrees, the aperture value (Fno) is 1.700, the system length is 9.102 mm, and the image height is 7.200 mm.

[0171] The aspheric coefficients of the various items in formula (1) from the object side surface 11 of the first lens 1 to the image side surface 82 of the eighth lens 8 in the second embodiment are as follows: Fig.13 shown.

[0172] In addition, the relationship between the important parameters of the optical imaging lens 10 of the second embodiment is as follows: Fig.46 shown.

[0173] The longitudinal spherical aberration of the second embodiment is as follows: Fig.11 As shown in A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±0.03 mm. Fig.11 B and Fig.11 In the two field curvature aberration diagrams of C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±0.10 mm. Fig.11 The distortion diagram of D shows that the distortion of the second embodiment is maintained within the range of ±14%.

[0174] It can be known from the above description that the half viewing angle of the second embodiment is greater than that of the first embodiment. Therefore, compared with the first embodiment, this embodiment has a larger angle range for receiving images.

[0175] 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 the longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the third embodiment. Fig.14 , a 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 of the lenses 1, 2, 3, 4, 5, 6, 7 and 8 are more or less different. In addition, in this embodiment, the circumferential area 124 of the image side surface 12 of the first lens 1 is a convex surface. The optical axis area 723 of the image side surface 72 of the seventh lens 7 is a convex surface. It should be noted here that in order to clearly show the drawing, Fig.14 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0176] The detailed optical data of the optical imaging lens 10 of the third embodiment are as follows: Fig.16As shown, the effective focal length of the optical imaging lens 10 of the third embodiment is 8.720 mm, the half field of view (HFOV) is 39.000 degrees, the aperture value (Fno) is 1.750, the system length is 8.537 mm, and the image height is 7.060 mm.

[0177] The aspheric coefficients of the various items in formula (1) from the object side surface 11 of the first lens 1 to the image side surface 82 of the eighth lens 8 in the third embodiment are as follows: Fig.17 shown.

[0178] In addition, the relationship between the important parameters of the optical imaging lens 10 of the third embodiment is as follows: Fig.46 shown.

[0179] The longitudinal spherical aberration of the third embodiment is as follows: Fig.15 As shown in A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±0.8 mm. Fig.15 B and Fig.15 In the two field curvature aberration diagrams of C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±1.0 mm. Fig.15 The distortion diagram of D shows that the distortion of the third embodiment is maintained within the range of ±14%.

[0180] It can be known from the above description that the system length TTL of the third embodiment is shorter than that of the first embodiment. Therefore, compared with the first embodiment, this embodiment has a smaller lens volume.

[0181] 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 the longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the fourth embodiment. Please refer to Fig.18 , a 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 of the lenses 1, 2, 3, 4, 5, 6, 7 and 8 are more or less different. In addition, in this embodiment, the circumferential area 514 of the object side surface 51 of the fifth lens 5 is convex, and the circumferential area 524 of the image side surface 52 is concave. It should be noted here that in order to clearly show the drawing, Fig.18 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0182] Detailed optical data of the optical imaging lens 10 of the fourth embodiment are as follows: Fig. 20As shown, the effective focal length of the optical imaging lens 10 of the fourth embodiment is 7.715 mm, the half field of view (HFOV) is 41.581 degrees, the aperture value (Fno) is 1.900, the system length is 9.464 mm, and the image height is 7.218 mm.

[0183] The aspheric coefficients of the various items in formula (1) from the object side surface 11 of the first lens 1 to the image side surface 82 of the eighth lens 8 in the fourth embodiment are as follows: Fig.21 shown.

[0184] In addition, the relationship between the important parameters of the optical imaging lens 10 of the fourth embodiment is as follows: Fig.46 shown.

[0185] The longitudinal spherical aberration of the fourth embodiment is as follows: Fig.19 As shown in A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±0.05 mm. Fig.19 B and Fig.19 In the two field curvature aberration diagrams of C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±0.06 mm. Fig.19 The distortion diagram of D shows that the distortion of the fourth embodiment is maintained within the range of ±6%.

[0186] It can be seen from the above description that the half viewing angle and image height of the fourth embodiment are greater than those of the first embodiment. In addition, the field curvature and distortion aberration of the fourth embodiment are better than those of the first embodiment.

[0187] 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 the longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the fifth embodiment. Fig. 22 , a 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 of the lenses 1, 2, 3, 4, 5, 6, 7 and 8 are more or less different. In addition, the circumferential area 514 of the object side surface 51 of the fifth lens 5 is convex, and the circumferential area 524 of the image side surface 52 is concave. It should be noted here that in order to clearly show the drawing, Fig. 22 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0188] Detailed optical data of the optical imaging lens 10 of the fifth embodiment are as follows: Fig.24As shown, the effective focal length of the optical imaging lens 10 of the fifth embodiment is 6.205 mm, the half field of view (HFOV) is 41.581 degrees, the aperture value (Fno) is 1.700, the system length is 7.737 mm, and the image height is 7.223 mm.

[0189] The aspheric coefficients of the various items in formula (1) from the object side surface 11 of the first lens 1 to the image side surface 82 of the eighth lens 8 in the fifth embodiment are as follows: Fig.25 shown.

[0190] In addition, the relationship between the important parameters of the optical imaging lens 10 of the fifth embodiment is as follows: Fig.46 shown.

[0191] The longitudinal spherical aberration of the fifth embodiment is as follows: Fig.23 As shown in A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±0.06 mm. Fig.23 B and Fig.23 In the two field curvature aberration diagrams of C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±0.12 mm. Fig.23 The distortion diagram of D shows that the distortion of the fifth embodiment is maintained within the range of ±35%.

[0192] It can be seen from the above description that the system length TTL of the fifth embodiment is shorter than that of the first embodiment. In addition, the half viewing angle and image height of the fifth embodiment are greater than those of the first embodiment.

[0193] 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 the longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the sixth embodiment. Fig.26 , a 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 of the lenses 1, 2, 3, 4, 5, 6, 7 and 8 are more or less different. In addition, in this embodiment, the circumferential area 514 of the object side surface 51 of the fifth lens 5 is convex, and the circumferential area 524 of the image side surface 52 is concave. It should be noted here that in order to clearly show the drawing, Fig.26 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0194] Detailed optical data of the optical imaging lens 10 of the sixth embodiment are as follows: Fig.28As shown, the effective focal length of the optical imaging lens 10 of the sixth embodiment is 7.111 mm, the half field of view (HFOV) is 41.581 degrees, the aperture value (Fno) is 1.700, the system length is 8.933 mm, and the image height is 7.263 mm.

[0195] The aspheric coefficients of the various items in formula (1) from the object side surface 11 of the first lens 1 to the image side surface 82 of the eighth lens 8 in the sixth embodiment are as follows: Fig.29 shown.

[0196] In addition, the relationship between the important parameters of the optical imaging lens 10 of the sixth embodiment is as follows: Fig.47 shown.

[0197] The longitudinal spherical aberration of the sixth embodiment is as follows: Fig. 27 As shown in A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±0.045 mm. Fig. 27 B and Fig. 27 In the two field curvature aberration diagrams of C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±0.07 mm. Fig. 27 The distortion diagram of D shows that the distortion of the sixth embodiment is maintained within the range of ±16%.

[0198] It can be seen from the above description that the system length TTL of the sixth embodiment is shorter than that of the first embodiment. The half viewing angle and image height of the sixth embodiment are greater than those of the first embodiment. In addition, the field curvature aberration of the sixth embodiment is better than that of the first embodiment.

[0199] Fig.30 is a schematic diagram of an optical imaging lens according to a seventh embodiment of the present invention, and Fig.31 A to Fig.31 D is the longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the seventh embodiment. Please refer to Fig.30 , a seventh 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 these lenses 1, 2, 3, 4, 5, 6, 7 and 8 are more or less different. In addition, in this embodiment, the circumferential area 124 of the image side surface 12 of the first lens 1 is convex. The third lens 3 has a negative refractive power. The circumferential area 524 of the image side surface 52 of the fifth lens 5 is concave. It should be noted here that in order to clearly show the drawing, Fig.30 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0200] Detailed optical data of the optical imaging lens 10 of the seventh embodiment are as follows: Fig.32As shown, the effective focal length of the optical imaging lens 10 of the seventh embodiment is 6.602 mm, the half field of view (HFOV) is 41.000 degrees, the aperture value (Fno) is 1.780, the system length is 9.123 mm, and the image height is 7.498 mm.

[0201] The aspheric coefficients of the various items in formula (1) from the object side surface 11 of the first lens 1 to the image side surface 82 of the eighth lens 8 in the seventh embodiment are as follows: Fig.33 shown.

[0202] In addition, the relationship between the important parameters of the optical imaging lens 10 of the seventh embodiment is as follows: Fig.47 shown.

[0203] The longitudinal spherical aberration of the seventh embodiment is as follows: Fig.31 As shown in A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±0.35 mm. Fig.31 B and Fig.31 In the two field curvature aberration diagrams of C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±0.6 mm. Fig.31 The distortion diagram of D shows that the distortion of the seventh embodiment is maintained within the range of ±25%.

[0204] It can be known from the above description that the image height of the seventh embodiment is greater than that of the first embodiment. Therefore, compared with the first embodiment, this embodiment has a larger image sensing range to receive imaging light to meet the high pixel requirement.

[0205] Fig.34 is a schematic diagram of an optical imaging lens according to an eighth embodiment of the present invention, and Fig.35 A to Fig.35 D is the longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the eighth embodiment. Please refer to Fig.34 , an eighth 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 the lenses 1, 2, 3, 4, 5, 6, 7 and 8 are more or less different. In addition, in this embodiment, the circumferential area 214 of the object side surface 21 of the second lens 2 is a concave surface. The fourth lens 4 has a positive refractive power. It should be noted here that in order to clearly show the drawing, Fig.34 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0206] Detailed optical data of the optical imaging lens 10 of the eighth embodiment are as follows: Fig.36As shown, the effective focal length of the optical imaging lens 10 of the eighth embodiment is 5.713 mm, the half field of view (HFOV) is 42.000 degrees, the aperture value (Fno) is 1.700, the system length is 9.243 mm, and the image height is 7.393 mm.

[0207] The aspheric coefficients of the various items in formula (1) from the object side surface 11 of the first lens 1 to the image side surface 82 of the eighth lens 8 are as follows: Fig.37 shown.

[0208] In addition, the relationship between the important parameters of the optical imaging lens 10 of the eighth embodiment is as follows: Fig.47 shown.

[0209] The longitudinal spherical aberration of the eighth embodiment is as follows: Fig.35 As shown in A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±0.9 mm. Fig.35 B and Fig.35 In the two field curvature aberration diagrams of C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±0.9 mm. Fig.35 The distortion diagram of D shows that the distortion of the eighth embodiment is maintained within the range of ±18%.

[0210] It can be known from the above description that the half viewing angle of the eighth embodiment is greater than that of the first embodiment, and the image height of the eighth embodiment is greater than that of the first embodiment.

[0211] Fig.38 is a schematic diagram of an optical imaging lens according to a ninth embodiment of the present invention, and Fig.39 A to Fig.39 D is the longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the ninth embodiment. Fig.38 , a ninth 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 these lenses 1, 2, 3, 4, 5, 6, 7 and 8 are more or less different. In addition, in this embodiment, the circumferential area 124 of the image side surface 12 of the first lens 1 is convex. The fifth lens 5 has a negative refractive power. The optical axis area 613 of the object side surface 61 of the sixth lens 6 is convex. It should be noted here that in order to clearly show the drawing, Fig.38 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0212] Detailed optical data of the optical imaging lens 10 of the ninth embodiment are as follows: Fig.40As shown, the effective focal length of the optical imaging lens 10 of the ninth embodiment is 6.361 mm, the half field of view (HFOV) is 40.000 degrees, the aperture value (Fno) is 1.700, the system length is 8.819 mm, and the image height is 7.002 mm.

[0213] The aspheric coefficients of the various items in formula (1) from the object side surface 11 of the first lens 1 to the image side surface 82 of the eighth lens 8 are as follows: Fig.41 shown.

[0214] In addition, the relationship between the important parameters of the optical imaging lens 10 of the ninth embodiment is as follows: Fig.47 shown.

[0215] The longitudinal spherical aberration of the ninth embodiment is as follows: Fig.39 As shown in A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±0.8 mm. Fig.39 B and Fig.39 In the two field curvature aberration diagrams of C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±1.2 mm. Fig.39 The distortion diagram of D shows that the distortion of the ninth embodiment is maintained within the range of ±35%.

[0216] It can be seen from the above description that the system length TTL of the ninth embodiment is shorter than that of the first embodiment. Therefore, compared with the first embodiment, this embodiment has a smaller lens volume.

[0217] Fig.42 is a schematic diagram of an optical imaging lens according to a tenth embodiment of the present invention, and Fig.43 A to Fig.43 D is the longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the tenth embodiment. Fig.42 , a tenth 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 the lenses 1, 2, 3, 4, 5, 6, 7 and 8 are more or less different. In addition, in this embodiment, the sixth lens 6 has a negative refractive power. It should be noted here that in order to clearly show the diagram, Fig.42 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0218] Detailed optical data of the optical imaging lens 10 of the tenth embodiment are as follows: Fig.44 As shown, the effective focal length of the optical imaging lens 10 of the tenth embodiment is 7.726 mm, the half field of view (HFOV) is 41.581 degrees, the aperture value (Fno) is 1.700, the system length is 9.528 mm, and the image height is 7.148 mm.

[0219] The aspheric coefficients of the various items in formula (1) from the object side surface 11 of the first lens 1 to the image side surface 82 of the eighth lens 8 in the tenth embodiment are as follows: Fig.45 shown.

[0220] In addition, the relationship between the important parameters of the optical imaging lens 10 of the tenth embodiment is as follows: Fig.47 shown.

[0221] The longitudinal spherical aberration of the tenth embodiment is as follows: Fig.43 As shown in A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±0.18 mm. Fig.43 B and Fig.43 In the two field curvature aberration diagrams of C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±0.7 mm. Fig.43 The distortion diagram of D shows that the distortion of the tenth embodiment is maintained within the range of ±4%.

[0222] It can be seen from the above description that the half viewing angle of the tenth embodiment is greater than that of the first embodiment. The distortion aberration of the tenth embodiment is better than that of the first embodiment.

[0223] Also refer to Fig.46 and Fig.47 It is a table diagram of various optical parameters of the first embodiment to the tenth embodiment.

[0224] In addition, when the image height ImgH or the aperture value Fno of the optical imaging lens 10 of the embodiment of the present invention 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.

[0225] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is met: ImgH / Fno≧3.750 mm, wherein a preferred range is 3.750 mm≦ImgH / Fno≦4.700 mm.

[0226] The optical imaging lens 10 of the embodiment of the present invention further meets the following condition: TL / Fno≧4.000 mm, wherein a preferred range is 4.000 mm≦TL / Fno≦5.600 mm.

[0227] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: (EFL+BFL) / Fno≧4.100 mm, wherein a preferred range is 4.100 mm≦(EFL+BFL) / Fno≦6.300 mm.

[0228] When the lens material meets the following configuration relationship, it is beneficial to the transmission and deflection of imaging light, and can effectively improve chromatic aberration and enhance imaging resolution.

[0229] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: V3+V4+V5≦125.000, wherein a preferred range is 90.000≦V3+V4+V5≦125.000.

[0230] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: V2+V6+V7≦125.000, wherein a preferred range is 80.000≦V2+V6+V7≦125.000.

[0231] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: (V6+V7+V8) / V5≦5.000, wherein a preferred range is 2.900≦(V6+V7+V8) / V5≦5.000.

[0232] In order to shorten the length of the lens system and ensure the imaging quality, while considering the difficulty of manufacturing, the air gap between the 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 10 can be improved.

[0233] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: (T7+G78+T8) / T4≧7.950, wherein a preferred range is 7.950≦(T7+G78+T8) / T4≦16.000.

[0234] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: AAG / ALT≧0.850, wherein a preferred range is 0.850≦AAG / ALT≦1.200.

[0235] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: (T1+G12+T2+G23+T3) / D41t52≧3.300, wherein a preferred range is 3.300≦(T1+G12+T2+G23+T3) / D41t52≦5.500.

[0236] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: Tmax / BFL≧1.000, wherein a preferred range is 1.000≦Tmax / BFL≦1.700.

[0237] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: (T2+G23+T3) / T6≧2.950, wherein a preferred range is 2.950≦(T2+G23+T3) / T6≦7.400.

[0238] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: EFL / (G45+T5)≧11.950, wherein a preferred range is 11.950≦EFL / (G45+T5)≦16.500.

[0239] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: (G23+G34) / G56≦2.000, wherein a preferred range is 0.700≦(G23+G34) / G56≦2.000.

[0240] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: Tmax / Tmin≧4.000, wherein a preferred range is 4.000≦Tmax / Tmin≦8.700.

[0241] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: (T6+G67+T7) / (T3+G34)≧1.950, wherein a preferred range is 1.950≦(T6+G67+T7) / (T3+G34)≦4.400.

[0242] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: TTL / (T4+T6)≧12.000, wherein a preferred range is 12.000≦TTL / (T4+T6)≦19.000.

[0243] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: (ALT+BFL) / AAG≦1.500, wherein a preferred range is 1.000≦(ALT+BFL) / AAG≦1.500.

[0244] 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 structure of the present invention.

[0245] 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 the imaging quality, or improve the assembly yield to improve the shortcomings of the previous technology. The lens of the embodiment of the present invention uses plastic material to reduce the weight of the lens and save costs.

[0246] The numerical ranges obtained by the combination ratio relationship of the optical parameters disclosed in each embodiment of the present invention, including the maximum and minimum values, can be implemented accordingly.

[0247] In summary, the optical imaging lens of the embodiments of the present invention can achieve the following effects and advantages:

[0248] 1. The longitudinal spherical aberration, field curvature aberration, and distortion of each embodiment of the present invention all meet the use specifications. In addition, the off-axis light rays of the three representative wavelengths of red, green, and blue at different heights are all concentrated near the imaging point. From the deflection amplitude of each curve, it can be seen that the imaging point deviations of the off-axis light rays at different heights are all controlled and have good spherical aberration, aberration, and distortion suppression capabilities. Further referring to the imaging quality data, the distances between the three representative wavelengths of red, green, and blue are also quite close to each other, indicating that the present invention has good concentration of light rays of different wavelengths under various conditions and has excellent dispersion suppression capabilities. In summary, the present invention can produce excellent imaging quality through the design and mutual matching of the lenses.

[0249] 2. When the second lens is designed to have a negative refractive power and the optical axis area of ​​the object side of the third lens is designed to be concave, it can gather light at a large angle. When the optical axis area of ​​the image side of the fourth lens is designed to be concave, the optical axis area of ​​the object side of the fifth lens is designed to be concave, and the seventh lens is designed to have a positive refractive power, the aberration caused by the first lens to the third lens can be corrected and the image height of the optical imaging lens can be expanded to have good optical quality. When the ratio of the lens thickness and the air gap is further controlled so that the optical imaging lens meets D52t81 / D41t52≧1.950, the distortion and aberration of the optical imaging lens can be improved, wherein the preferred range of D52t81 / D41t52 is 1.950≦D52t81 / D41t52≦6.500.

[0250] 3. When the second lens is designed to have a negative refractive power and the circumferential area of ​​the object side of the third lens is designed to be concave, it can gather light at a large angle. When the optical axis area of ​​the image side of the fourth lens is designed to be concave, the optical axis area of ​​the object side of the fifth lens is designed to be concave, and the seventh lens is designed to have a positive refractive power, the aberration caused by the first lens to the third lens can be corrected and the image height of the optical imaging lens can be expanded to have good optical quality. When the ratio of the lens thickness and the air gap is further controlled so that the optical imaging lens meets D52t81 / D41t52≧3.000, in addition to effectively improving the distortion and aberration of the optical imaging lens, the volume of the lens can be further controlled to achieve a lightweight effect. Among them, the preferred range of D52t81 / D41t52 is 3.000≦D52t81 / D41t52≦6.500.

[0251] Fourth, when the second lens is designed to have a negative refractive power and the circumferential area of ​​the image side surface of the third lens is designed to be convex, it can gather light at a large angle. In conjunction with the optical axis area of ​​the image side surface of the fourth lens being designed to be concave, the optical axis area of ​​the object side surface of the fifth lens being designed to be concave, the seventh lens being designed to have a positive refractive power, and the optical axis area of ​​the object side surface of the eighth lens being designed to be concave, the aberration caused by the first lens to the third lens can be corrected and the image height of the optical imaging lens can be expanded to have good optical quality. When the ratio of the lens thickness and the air gap is further controlled so that the optical imaging lens meets D52t81 / D41t52≧3.000, in addition to effectively improving chromatic aberration, the volume of the lens can also be further controlled to achieve a lightweight effect, wherein the preferred range of D52t81 / D41t52 is 3.000≦D52t81 / D41t52≦6.500.

[0252] 5. As in the second to fourth points above, if the first lens element is further designed to have a positive refractive power or the eighth lens element has a negative refractive power, the spherical aberration of the optical imaging lens can be effectively improved.

[0253] 6. When the optical imaging lens of the embodiment of the present invention satisfies one of the following combinations (a) to (d), spherical aberration and field curvature aberration can be effectively improved, so that the optical imaging lens has good imaging quality.

[0254] (a) at least one of the first lens or the third lens has a positive refractive power;

[0255] (b) at least one of the first lens or the fifth lens has a positive refractive power;

[0256] (c) at least one of the fourth lens element or the eighth lens element has a negative refractive power;

[0257] (d) At least one of the sixth lens or the eighth lens has negative refractive power.

[0258] 7. The lens of each embodiment of the present invention adopts an aspherical design, which is more conducive to optimizing imaging quality.

[0259] 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:

[0260] (1) The range covered by the optical parameter, for example: α2≦A≦α1 or β2≦B≦β1, α1 is the maximum value of the optical parameter A in multiple embodiments, α2 is the minimum value of the optical parameter A in multiple embodiments, β1 is the maximum value of the optical parameter B in multiple embodiments, and β2 is the minimum value of the optical parameter B in multiple embodiments.

[0261] (2) The comparative relationship between optical parameters, for example: A is greater than B or A is less than B.

[0262] (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 conditional formula E≦γ1 or E≧γ2 or γ2≦E≦γ1, γ1 and γ2 are the values ​​obtained by calculating the optical parameters A and the optical parameters B of the same embodiment, and γ1 is the maximum value among multiple embodiments of the present invention, and γ2 is the minimum value among multiple embodiments of the present invention.

[0263] The ranges covered by the above optical parameters, the comparison relationship between the optical parameters, and the maximum and minimum values ​​of the conditional expressions, as well as the numerical ranges within the maximum and minimum values, are all features that can be implemented by the present invention and are within the scope disclosed by the present invention. The above is only an example and should not be limited to this.

[0264] 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 implementation mode of the present invention is a specific embodiment to illustrate the principle of the present invention, and the present invention should not be limited to the disclosed embodiment. In other words, the embodiment and its drawings are only for demonstration of the present invention and are not limited thereto.

[0265] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person having ordinary knowledge in the technical field may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims

1. An optical imaging lens, characterized in that: The lens comprises 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 in sequence along an optical axis from an object side to an image side, 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 the imaging light to pass therethrough; The first lens has a positive refractive power, an optical axis region of the object side surface of the first lens is a convex surface, an optical axis region of the image side surface of the first lens is a concave surface, and a circumferential region of the object side surface of the first lens is a convex surface; The second lens has a negative refractive power, 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; An optical axis region of the object side surface of the third lens is a concave surface, an optical axis region of the image side surface of the third lens is a convex surface, a circumferential region of the object side surface of the third lens is a concave surface, and a circumferential region of the image side surface of the third lens is a convex surface; An optical axis region of the image-side surface of the fourth lens is a concave surface, an optical axis region of the object-side surface of the fourth lens is a convex surface, a circumferential region of the object-side surface of the fourth lens is a concave surface, and a circumferential region of the image-side surface of the fourth lens is a convex surface; An optical axis region of the object-side surface of the fifth lens is a concave surface, and an optical axis region of the image-side surface of the fifth lens is a convex surface; An optical axis region of the image-side surface of the sixth lens is a convex 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; The seventh lens has a positive refractive power, 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, and a circumferential region of the image side surface of the seventh lens is a convex surface; The eighth lens has a negative refractive power, an optical axis region of the object side surface of the eighth lens is a concave surface, an optical axis region of the image side surface of the eighth lens is a concave surface, a circumferential region of the object side surface of the eighth lens is a concave surface, and a circumferential region of the image side surface of the eighth lens is a convex surface; The optical imaging lens has only the above eight lenses and satisfies the following conditional expressions: D52t81 / D41t52≧1.950, ImgH / Fno≧3.750 mm and EFL / (G45+T5)≧11.950, wherein D52t81 is the distance from the image side surface of the fifth lens to the object side surface of the eighth lens on the optical axis, D41t52 is the distance from the object side surface of the fourth lens to the image side surface of the fifth lens on the optical axis, ImgH is the image height of the optical imaging lens, Fno is the aperture value of the optical imaging lens, EFL is the effective focal length of the optical imaging lens, G45 is the air gap between the fourth lens and the fifth lens on the optical axis, and T5 is the thickness of the fifth lens on the optical axis.

2. An optical imaging lens, characterized in that: The lens comprises 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 in sequence along an optical axis from an object side to an image side, 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 the imaging light to pass therethrough; The first lens has a positive refractive power, an optical axis region of the object side surface of the first lens is a convex surface, an optical axis region of the image side surface of the first lens is a concave surface, and a circumferential region of the object side surface of the first lens is a convex surface; The second lens has a negative refractive power, 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 object side surface of the third lens is a concave surface, an optical axis area of ​​the object side surface of the third lens is a concave surface, an optical axis area of ​​the image side surface of the third lens is a convex surface, and a circumferential area of ​​the image side surface of the third lens is a convex surface; An optical axis region of the image-side surface of the fourth lens is a concave surface, an optical axis region of the object-side surface of the fourth lens is a convex surface, a circumferential region of the object-side surface of the fourth lens is a concave surface, and a circumferential region of the image-side surface of the fourth lens is a convex surface; An optical axis region of the object-side surface of the fifth lens is a concave surface, and an optical axis region of the image-side surface of the fifth lens is a convex surface; An optical axis region of the image-side surface of the sixth lens is a convex 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; The seventh lens has a positive refractive power, 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, and a circumferential region of the image side surface of the seventh lens is a convex surface; The eighth lens has a negative refractive power, an optical axis region of the object side surface of the eighth lens is a concave surface, an optical axis region of the image side surface of the eighth lens is a concave surface, a circumferential region of the object side surface of the eighth lens is a concave surface, and a circumferential region of the image side surface of the eighth lens is a convex surface; The optical imaging lens has only the above eight lenses and satisfies the following conditional formulas: D52t81 / D41t52≧3.000, (T7+G78+T8) / T4≧7.950 and (V6+V7+V8) / V5≦5.000, wherein D52t81 is the distance from the image side surface of the fifth lens to the object side surface of the eighth lens on the optical axis, D41t52 is the distance from the object side surface of the fourth lens to the image side surface of the fifth lens on the optical axis, T4 is the thickness of the fourth lens on the optical axis, T7 is the thickness of the seventh lens on the optical axis, T8 is the thickness of the eighth lens on the optical axis, G78 is the air gap between the seventh lens and the eighth lens on the optical axis, V5 is the Abbe number of the fifth lens, V6 is the Abbe number of the sixth lens, V7 is the Abbe number of the seventh lens, and V8 is the Abbe number of the eighth lens.

3. The optical imaging lens according to claim 1 or 2, wherein: The optical imaging lens further satisfies the following conditional formula: V3+V4+V5≦125.000, wherein V3 is the Abbe number of the third lens, V4 is the Abbe number of the fourth lens, and V5 is the Abbe number of the fifth lens.

4. The optical imaging lens according to claim 1 or 2, wherein: The optical imaging lens further satisfies the following conditional formula: AAG / ALT≧0.850, wherein AAG is the sum of seven air gaps from the first lens to the eighth lens on the optical axis, and ALT is the sum of eight lens thicknesses from the first lens to the eighth lens on the optical axis.

5. The optical imaging lens according to claim 1 or 2, wherein: The optical imaging lens further satisfies the following conditional formula: (T1+G12+T2+G23+T3) / D41t52≧3.300, wherein T1 is the thickness of the first lens on the optical axis, T2 is the thickness of the second lens on the optical axis, T3 is the thickness of the third lens on the optical axis, G12 is the air gap between the first lens and the second lens on the optical axis, and G23 is the air gap between the second lens and the third lens on the optical axis.

6. The optical imaging lens according to claim 1 or 2, wherein: The optical imaging lens further satisfies the following conditional formula: Tmax / BFL≧1.000, wherein Tmax is the maximum value of the thicknesses of eight lenses from the first lens to the eighth 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.

7. The optical imaging lens according to claim 1, wherein: The optical imaging lens further satisfies the following conditional formula: V2+V6+V7≦125.000, wherein V2 is the Abbe number of the second lens, V6 is the Abbe number of the sixth lens, and V7 is the Abbe number of the seventh lens.

8. The optical imaging lens according to claim 2, wherein: The optical imaging lens further satisfies the following conditional formula: (EFL+BFL) / Fno≧4.200 mm, wherein EFL is the effective focal length 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 Fno is the aperture value of the optical imaging lens.

9. The optical imaging lens according to claim 1 or 2, wherein: The optical imaging lens further satisfies the following conditional formula: (T2+G23+T3) / T6≧2.950, wherein T2 is the thickness of the second lens on the optical axis, T3 is the thickness of the third lens on the optical axis, T6 is the thickness of the sixth lens on the optical axis, and G23 is the air gap between the second lens and the third lens on the optical axis.

10. The optical imaging lens according to claim 2, wherein: The optical imaging lens further satisfies the following conditional formula: EFL / (G45+T5)≧11.950, wherein EFL is the effective focal length of the optical imaging lens, G45 is the air gap between the fourth lens and the fifth lens on the optical axis, and T5 is the thickness of the fifth lens on the optical axis.

11. The optical imaging lens according to claim 1 or 2, wherein: The optical imaging lens further satisfies the following conditional formula: (G23+G34) / G56≦2.000, wherein G23 is the air gap between the second lens and the third lens on the optical axis, G34 is the air gap between the third lens and the fourth lens on the optical axis, and G56 is the air gap between the fifth lens and the sixth lens on the optical axis.

12. The optical imaging lens according to claim 1 or 2, wherein: The optical imaging lens further satisfies the following conditional formula: Tmax / Tmin≧4.000, wherein 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.

13. The optical imaging lens according to claim 2, wherein: The optical imaging lens further satisfies the following conditional expression: TL / Fno≧4.000 mm, 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 Fno is the aperture value of the optical imaging lens.

14. The optical imaging lens according to claim 2, wherein: The optical imaging lens further satisfies the following conditional formula: (T6+G67+T7) / (T3+G34)≧1.950, wherein T3 is the thickness of the third lens on the optical axis, T6 is the thickness of the sixth lens on the optical axis, G34 is the air gap between the third lens and the fourth lens on the optical axis, and G67 is the air gap between the sixth lens and the seventh lens on the optical axis.

15. The optical imaging lens according to claim 2, wherein: The optical imaging lens further satisfies the following conditional formula: TTL / (T4+T6)≧12.000, wherein TTL is the distance from the object side surface of the first lens to an imaging surface on the optical axis, and T6 is the thickness of the sixth lens on the optical axis.

16. The optical imaging lens according to claim 1 or 2, wherein: The optical imaging lens further satisfies the following conditional formula: (ALT+BFL) / AAG≦1.500, wherein ALT is the sum of the thicknesses of eight lenses from the first lens to the eighth lens on the optical axis, BFL is the distance from the image side surface of the eighth lens to an imaging plane on the optical axis, and AAG is the sum of seven air gaps from the first lens to the eighth lens on the optical axis.

Images