Optical imaging lens

Abstract

The present invention provides an optical imaging lens, which includes a first lens to an eighth lens in order from the object side to the image side along the optical axis, and each lens has an object side surface and an image side surface, the first lens has a positive refractive power, the second lens has a negative refractive power, the third lens has a negative refractive power and the circumferential area of ​​the object side surface of the third lens is a concave surface, the seventh lens has a negative refractive power, and the optical axis area of ​​the object side surface of the eighth lens is a convex surface and the circumferential area of ​​the image side surface of the eighth lens is a convex surface, and the optical imaging lens has only the above eight lenses and satisfies Tavg567 / Tstd567≧3.600. The optical imaging lens has the advantages of a small aperture value, a large image height, improved resolution, and maintained good imaging quality.

Description

Technical Field

[0001] The present invention belongs to the field of optical elements. Specifically, the present invention is particularly directed to a device that is mainly used for shooting images and recording videos and can be applied to portable electronic products, such as optical imaging lenses that can be applied to electronic devices such as mobile phones, cameras, tablet computers, and personal digital assistants (PDAs). Background Art

[0002] The specifications of portable electronic devices are changing with each passing day, and their key components - optical imaging lenses are also becoming more diversified. The main lens of portable electronic devices not only requires a larger aperture and a shorter system length, but also pursues higher pixels and higher resolution. High pixels imply that the image height of the lens must be increased, and the pixel requirements are increased by using a larger image sensor to receive imaging light.

[0003] However, the large aperture design allows the lens to receive more imaging light, which increases the difficulty of design; and the high pixel count increases the resolution of the lens, which doubles the difficulty of design with the large aperture design. Therefore, how to add multiple lenses to a limited system length, increase resolution, and increase aperture and image height at the same time is a challenge that needs to be solved. Summary of the invention

[0004] The embodiments of the present invention provide an eight-piece optical imaging lens having a small aperture value, a large image height, improved resolution, maintained good imaging quality, and being technically feasible. The eight-piece optical imaging lens of the present invention is arranged in sequence on the optical axis from the object side to the image side, with a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens each have 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.

[0005] In one embodiment of the present invention, the first lens has a positive refractive power, the second lens has a negative refractive power, the third lens has a negative refractive power and the circumferential area of ​​the object side surface of the third lens is a concave surface, the seventh lens has a negative refractive power, and the optical axis area of ​​the object side surface of the eighth lens is a convex surface and the circumferential area 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 Tavg567 / Tstd567≧3.600.

[0006] In another embodiment of the present invention, the first lens has a positive refractive power, 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 object side surface of the fifth lens is a convex surface and the circumferential area of ​​the object side surface of the fifth lens is a concave surface, the optical axis area of ​​the object side surface of the sixth lens is a convex surface, the seventh lens has a negative refractive power, and the circumferential area 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 Tavg567 / Tstd567≧4.600.

[0007] In another embodiment of the present invention, the first lens has a positive refractive power, 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 object side surface of the fifth lens is a convex surface and the circumferential area of ​​the image side surface of the fifth lens is a convex surface, the optical axis area of ​​the object side surface of the sixth lens is a convex surface, the seventh lens has a negative refractive power, and the circumferential area 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 Tavg567 / Tstd567≧4.600.

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

[0009] 55.000≦υ3+υ4;

[0010] υ7+υ8≦100.000;

[0011] (T1+D12t31) / (G34+T4)≦5.300;

[0012] D52t71 / T7≦2.700;

[0013] Fno*D11t32 / (G78+T8)≦4.000;

[0014] 5.800≦(EPD+ImgH) / (Tmax+Tmin);

[0015] 55.000≦υ4+υ5;

[0016] 7.000≦(EFL+AAG) / BFL;

[0017] (D12t31+T3) / (G45+T5)≦3.300;

[0018] (D11t32+D52t71) / (T7+G78)≦7.000;

[0019] Fno*D52t82 / D32t52≦5.000;

[0020] 5.000≦(TTL+ImgH) / (T1+T3+T8);

[0021] υ6+υ7≦100.000;

[0022] 4.400≦(TL+ImgH) / D11t32;

[0023] 2.800≦Tavg5678 / Tstd5678;

[0024] (D52t71+BFL) / (T7+G78)≦3.610;

[0025] ALT / D32t52≦5.300.

[0026] Wherein, υ3 is the Abbe number of the third lens, υ4 is the Abbe number of the fourth lens, υ5 is the Abbe number of the fifth lens, υ6 is the Abbe number of the sixth lens, υ7 is the Abbe number of the seventh lens, and υ8 is the Abbe number of the eighth lens. T1 is the thickness of the first 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, 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. Tmax is the maximum value of the eight lens thicknesses of the first lens to the eighth lens on the optical axis, that is, the maximum value among T1, T2, T3, T4, T5, T6, T7 and T8; Tmin is the minimum value of the eight lens thicknesses of the first lens to the eighth lens on the optical axis, that is, the minimum value among T1, T2, T3, T4, T5, T6, T7 and T8. 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, and G78 is the air gap between the seventh lens and the eighth lens on the optical axis.

[0027] D11t32 is the distance from the object side surface of the first lens to the image side surface of the third lens on the optical axis; D12t31 is the distance from the image side surface of the first lens to the object side surface of the third lens on the optical axis; D52t71 is the distance from the image side surface of the fifth lens to the object side surface of the seventh lens on the optical axis; D52t82 is the distance from the image side surface of the fifth lens to the image side surface of the eighth lens on the optical axis; D32t52 is the distance from the image side surface of the third lens to the image side surface of the fifth lens on the optical axis. Tavg567 is the average value of the three lens thicknesses of the fifth lens to the seventh lens on the optical axis, that is, the average value of T5, T6 and T7; Tstd567 is the matrix standard deviation of the three lens thicknesses of the fifth lens to the seventh lens on the optical axis, that is, the matrix standard deviation of T5, T6 and T7; Tavg5678 is the average value of the four lens thicknesses of the fifth lens to the eighth lens on the optical axis, that is, the average value of T5, T6, T7 and T8; Tstd5678 is the matrix standard deviation of the four lens thicknesses of the fifth lens to the eighth lens on the optical axis, that is, the matrix standard deviation of T5, T6, T7 and T8.

[0028] In addition, TTL is the distance from the object side of the first lens to the imaging plane on the optical axis, ALT is the total thickness of the eight lenses from the first lens to the eighth lens on the optical axis, Tavg is the average thickness of the eight lenses from the first lens to the eighth lens on the optical axis, EPD is the entrance pupil diameter (Entrance Pupil Diameter) of the optical imaging lens, which is equal to the effective focal length of the optical imaging lens divided by the aperture value, TL is the distance from the object side of the first lens to the image side of the eighth lens on the optical axis, AAG is the sum of the seven air gaps from the first lens to the eighth lens on the optical axis, EFL is the effective focal length of the optical imaging lens, Fno is the aperture value of the optical imaging lens, BFL is the distance from the image side of the eighth lens to the imaging plane on the optical axis, and ImgH is the image height of the optical imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figures 1 to 5 A schematic diagram illustrating a method for determining a curvature shape of an optical imaging lens according to the present invention is shown.

[0030] Figure 6 A schematic diagram of a first embodiment of the optical imaging lens system of the present invention is shown.

[0031] Figure 7 Graphs showing longitudinal spherical aberration and various aberrations of the first embodiment.

[0032] Figure 8 A schematic diagram of a second embodiment of the optical imaging lens system of the present invention is shown.

[0033] Fig. 9 Graphs showing longitudinal spherical aberration and various aberrations of the second embodiment.

[0034] Fig.10 A schematic diagram is shown of a third embodiment of the optical imaging lens system of the present invention.

[0035] Fig.11 Graphs showing longitudinal spherical aberration and various aberrations of the third embodiment.

[0036] Fig.12 A schematic diagram is shown of a fourth embodiment of the optical imaging lens system of the present invention.

[0037] Fig.13 Graphs showing longitudinal spherical aberration and various aberrations of the fourth embodiment.

[0038] Fig.14 A schematic diagram of a fifth embodiment of the optical imaging lens system of the present invention is shown.

[0039] Fig.15 Graphs showing longitudinal spherical aberration and various aberrations of the fifth embodiment.

[0040] Fig.16 A schematic diagram is shown of a sixth embodiment of the optical imaging lens system of the present invention.

[0041] Fig.17 Graphs showing longitudinal spherical aberration and various aberrations of the sixth embodiment.

[0042] Fig.18 A schematic diagram illustrating a seventh embodiment of the optical imaging lens system of the present invention is shown.

[0043] Fig.19 Graphs showing longitudinal spherical aberration and various aberrations of the seventh embodiment.

[0044] Fig. 20 Detailed optical data of the first embodiment are shown.

[0045] Fig.21 Detailed aspherical surface data of the first embodiment are shown.

[0046] Fig. 22 Detailed optical data of the second embodiment are shown.

[0047] Fig.23 Detailed aspherical surface data of the second embodiment are shown.

[0048] Fig.24 Detailed optical data of the third embodiment are shown.

[0049] Fig.25 Detailed aspherical surface data of the third embodiment are shown.

[0050] Fig.26 Detailed optical data of the fourth embodiment are shown.

[0051] Fig. 27Detailed aspherical surface data of the fourth embodiment are shown.

[0052] Fig.28 Detailed optical data of the fifth embodiment are shown.

[0053] Fig.29 Detailed aspherical surface data of the fifth embodiment are shown.

[0054] Fig.30 Detailed optical data of the sixth embodiment are shown.

[0055] Fig.31 Detailed aspherical surface data of the sixth embodiment are shown.

[0056] Fig.32 Detailed optical data of the seventh embodiment are shown.

[0057] Fig.33 Detailed aspherical surface data of the seventh embodiment are shown.

[0058] Fig.34 Indicates important parameters of each embodiment.

[0059] Fig.35 Indicates important parameters of each embodiment. DETAILED DESCRIPTION

[0060] Before describing the present invention in detail, the following explanations of the symbols in the accompanying drawings are provided: 1 ... optical imaging lens; 2 ... aperture; 3 ... filter; 4 ... imaging plane; 11, 21, 31, 41, 51, 61, 71, 81, 110, 410, 510 ... object side; 12, 22, 32, 42, 52, 62, 72, 82, 120, 320 ... image side; 13, 16, 23, 26, 33, 36, 43, 46, 53, 56, 63, 66, 73, 76, 83, 86, Z1 ... optical axis region; 14, 17, 24, 27, 34, 37, 44, 47, 54, 57, 64, 67, 74, 77, 84, 8 7, Z2…circumferential area; 10…first lens; 20…second lens; 30…third lens; 40…fourth lens; 50…fifth lens; 60…sixth lens; 70…seventh lens; 80…eighth lens; 100, 200, 300, 400, 500…lenses; 130…assembly part; 211, 212…parallel rays; A1…object side; A2…image side; CP…center point; CP1…first center point; CP2…second center point; TP1…first transition point; TP2…second transition point; OB…optical boundary; I…optical axis; Lc…chief ray; Lm…marginal ray; EL…extension line; Z3…relay area; M…intersection point; R…intersection point.

[0061] 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.

[0062] The optical system of the present specification includes at least one lens, which receives imaging light from the incident optical system that is parallel to the optical axis and within a half-viewing angle (HFOV) relative to the optical axis. The imaging light is imaged on the imaging surface through the optical system. The "lens has a positive refractive power (or negative refractive power)" refers to the paraxial refractive power of the lens calculated by Gaussian optical theory is positive (or negative). The "object side (or image side) of the lens" is defined as a specific range of the imaging light passing through the lens surface. The imaging light includes at least two types of light: the chief ray Lc and the marginal ray Lm (such as Figure 1 The object side (or image side) of the lens can be divided into different regions according to different positions, including an optical axis region, a circumferential region, or one or more intermediate regions in some embodiments. The description of these regions will be described in detail below.

[0063] 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 of the surface and the optical axis I. Figure 1 As shown in the example, the first center point CP1 is located on the object side 110 of the lens 100, and the second center point CP2 is located on the image side 120 of the lens 100. A conversion point is a point on the lens surface, and the tangent of the point is perpendicular to the optical axis I. The optical boundary OB of the lens surface is defined as the point where the radially outermost edge ray Lm passing through the lens surface intersects the lens surface. All conversion points are located between the optical axis I and the optical boundary OB of the lens surface. In addition, the surface of the lens 100 may have no conversion points or at least one conversion point. If a single lens surface has multiple conversion points, the conversion points are named in sequence from the first conversion point in the radial outward direction. For example, the first conversion point TP1 (closest to the optical axis I), the second conversion point TP2 (closest to the optical axis I), and the second conversion point TP2 (closest to the optical axis I) may be named in sequence. Figure 4 as shown) and the Nth conversion point (farthest from the optical axis I).

[0064] 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.

[0065] 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.

[0066] In addition, see Figure 1 The lens 100 may further include an assembly portion 130 extending radially outward from the optical boundary OB. The assembly portion 130 is generally used for assembling the lens 100 to a corresponding element (not shown) of the optical system. The imaging light does not reach the assembly portion 130. The structure and shape of the assembly portion 130 are merely examples for illustrating the present invention and are not intended to limit the scope of the present invention. The assembly portion 130 of the lens discussed below may be partially or completely omitted in the drawings.

[0067] 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.

[0068] On the other hand, the surface convexity of the optical axis area can also be determined according to the judgment method of the general knowledgeable person in the field, that is, the convexity of the surface shape of the optical axis area of ​​the lens can be determined by the positive and negative signs of the curvature radius of the paraxial axis (abbreviated as R value). R value can be commonly used in optical design software, such as Zemax or CodeV. R value is also commonly found in the lens data sheet of optical design software. For the object side, when the R value is positive, the optical axis area of ​​the object side is determined to be convex; when the R value is negative, the optical axis area of ​​the object side is determined to be concave. On the contrary, for the image side, when the R value is positive, the optical axis area of ​​the image side is determined to be concave; when the R value is negative, the optical axis area of ​​the image side is determined to be convex. The result of this method is consistent with the result of the above-mentioned determination method by the intersection of the light ray / light extension line and the optical axis. The determination method of the intersection of the light ray / light extension line and the optical axis is to determine the surface convexity by locating the focus of a light ray parallel to the optical axis on the object side or the image side of the lens. The terms “a region is a convex surface (or a concave surface)”, “a region is convex (or concave)” or “a convex (or concave) region” described in this specification can be used interchangeably.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] Figure 5 is a radial cross-sectional view of the lens 500. The object side surface 510 of the lens 500 has no transition point. For a lens surface without a transition point, such as the object side surface 510 of the lens 500, 0% to 50% of the distance from the optical axis I to the optical boundary OB of the lens surface is defined as the optical axis area, and 50% to 100% of the distance from the optical axis I to the optical boundary OB of the lens surface is defined as the circumferential area. Figure 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.

[0075] like Figure 6As shown, the optical imaging lens 1 of the present invention is mainly composed of eight lenses along the optical axis I, from the object side A1 where the object (not shown) is placed to the image side A2 where the image is formed, and includes a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, a seventh lens 70, an eighth lens 80 and an image plane 4 in sequence. Generally speaking, the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens 60, the seventh lens 70 and the eighth lens 80 can all be made of transparent plastic materials, but the present invention is not limited thereto. The lenses in the optical imaging lens 1 of the present invention only include the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens 60, the seventh lens 70 and the eighth lens 80. The optical axis I is the optical axis of the entire optical imaging lens 1, so the optical axis of each lens is the same as the optical axis of the optical imaging lens 1.

[0076] In addition, the optical imaging lens 1 further includes an aperture stop 2, which is disposed at an appropriate position. Figure 6 In the embodiment of the present invention, the aperture 2 is disposed on the side of the first lens 10 facing the object side A1. In other words, the first lens 10 is disposed between the aperture 2 and the second lens 20. When light (not shown) emitted by the object to be photographed (not shown) located on the object side A1 enters the optical imaging lens 1 of the present invention, the light passes through the aperture 2, the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens 60, the seventh lens 70, the eighth lens 80 and the filter 3 in sequence, and then the light is focused on the imaging plane 4 of the image side A2 to form a clear image. In various embodiments of the present invention, the filter 3 is disposed between the eighth lens 80 and the imaging plane 4, and can be a filter with various suitable functions, such as an infrared cut filter, which is used to prevent infrared light in the imaging light from being transmitted to the imaging plane 4 and affecting the imaging quality.

[0077] Each lens in the optical imaging lens 1 of the present invention has an object-side surface facing the object side A1 and allowing the imaging light to pass through, and an image-side surface facing the image side A2 and allowing the imaging light to pass through. In addition, each lens in the optical imaging lens 1 of the present invention also has an optical axis region and a circumferential region. For example, the first lens 10 has an object-side surface 11 and an image-side surface 12; the second lens 20 has an object-side surface 21 and an image-side surface 22; the third lens 30 has an object-side surface 31 and an image-side surface 32; the fourth lens 40 has an object-side surface 41 and an image-side surface 42; the fifth lens 50 has an object-side surface 51 and an image-side surface 52; the sixth lens 60 has an object-side surface 61 and an image-side surface 62; the seventh lens 70 has an object-side surface 71 and an image-side surface 72; and the eighth lens 80 has an object-side surface 81 and an image-side surface 82. Each object-side surface and image-side surface has an optical axis region and a circumferential region, respectively.

[0078] Each lens in the optical imaging lens 1 of the present invention also has a thickness T on the optical axis I. For example, the first lens 10 has a first lens thickness T1, the second lens 20 has a second lens thickness T2, the third lens 30 has a third lens thickness T3, the fourth lens 40 has a fourth lens thickness T4, the fifth lens 50 has a fifth lens thickness T5, the sixth lens 60 has a sixth lens thickness T6, the seventh lens 70 has a seventh lens thickness T7, and the eighth lens 80 has an eighth lens thickness T8. Therefore, the sum of the thicknesses of the eight lenses from the first lens 10 to the eighth lens 80 on the optical axis I in the optical imaging lens 1 of the present invention is called ALT. That is, ALT=T1+T2+T3+T4+T5+T6+T7+T8.

[0079] Tmax is the maximum value of the eight lens thicknesses of the first lens 10 to the eighth lens 80 on the optical axis I, that is, the maximum value among T1, T2, T3, T4, T5, T6, T7 and T8. Tmin is the minimum value of the eight lens thicknesses of the first lens 10 to the eighth lens 80 on the optical axis I, that is, the minimum value among T1, T2, T3, T4, T5, T6, T7 and T8. Tavg is the average value of the eight lens thicknesses of the first lens 10 to the eighth lens 80 on the optical axis I, that is, Tavg=ALT / 8. Tavg567 is the average value of the three lens thicknesses of the fifth lens 50 to the seventh lens 70 on the optical axis I, that is, the average value of T5, T6 and T7. Tstd567 is the parent standard deviation of the three lens thicknesses of the fifth lens 50 to the seventh lens 70 on the optical axis I, that is, the parent standard deviation of T5, T6 and T7. Tavg5678 is the average value of the thickness of the four lenses of the fifth lens 50 to the eighth lens 80 on the optical axis I, that is, the average value of T5, T6, T7 and T8. Tstd5678 is the parent standard deviation of the thickness of the four lenses of the fifth lens 50 to the eighth lens 80 on the optical axis I, that is, the parent standard deviation of T5, T6, T7 and T8.

[0080] In addition, in the optical imaging lens 1 of the present invention, there are air gaps between the lenses on the optical axis I. For example, the air gap between the first lens 10 and the second lens 20 on the optical axis I is called G12, the air gap between the second lens 20 and the third lens 30 on the optical axis I is called G23, the air gap between the third lens 30 and the fourth lens 40 on the optical axis I is called G34, the air gap between the fourth lens 40 and the fifth lens 50 on the optical axis I is called G45, the air gap between the fifth lens 50 and the sixth lens 60 on the optical axis I is called G56, the air gap between the sixth lens 60 and the seventh lens 70 on the optical axis I is called G67, and the air gap between the seventh lens 70 and the eighth lens 80 on the optical axis I is called G78. Therefore, the sum of the seven air gaps on the optical axis I from the first lens 10 to the eighth lens 80 is called AAG. That is, AAG=G12+G23+G34+G45+G56+G67+G78.

[0081] D11t32 is the distance from the object side surface 11 of the first lens 10 to the image side surface 32 of the third lens 30 on the optical axis I. D12t31 is the distance from the image side surface 12 of the first lens 10 to the object side surface 31 of the third lens 30 on the optical axis I. D52t71 is the distance from the image side surface 52 of the fifth lens 50 to the object side surface 71 of the seventh lens 70 on the optical axis I. D52t82 is the distance from the image side surface 52 of the fifth lens 50 to the image side surface 82 of the eighth lens 80 on the optical axis I. D32t52 is the distance from the image side surface 32 of the third lens 30 to the image side surface 52 of the fifth lens 50 on the optical axis I.

[0082] In addition, the distance between the object side surface 11 of the first lens 10 and the imaging surface 4 on the optical axis I is the system length TTL of the optical imaging lens 1. The effective focal length of the optical imaging lens 1 is EFL. The distance between the object side surface 11 of the first lens 10 and the image side surface 82 of the eighth lens 80 on the optical axis I is TL. HFOV is the half viewing angle of the optical imaging lens 1, that is, half of the maximum viewing angle (Field of View). ImgH is the image height of the optical imaging lens 1. Fno is the aperture value of the optical imaging lens 1.

[0083] When the filter 3 is arranged between the eighth lens 80 and the imaging plane 4, G8F represents the air gap between the eighth lens 80 and the filter 3 on the optical axis I, TF represents the thickness of the filter 3 on the optical axis I, GFP represents the air gap between the filter 3 and the imaging plane 4 on the optical axis I, and BFL is the back focal length of the optical imaging lens 1, that is, the distance from the image side surface 82 of the eighth lens 80 to the imaging plane 4 on the optical axis I, that is, BFL=G8F+TF+GFP.

[0084] In addition, it is further defined that: f1 is the focal length of the first lens 10; f2 is the focal length of the second lens 20; f3 is the focal length of the third lens 30; f4 is the focal length of the fourth lens 40; f5 is the focal length of the fifth lens 50; f6 is the focal length of the sixth lens 60; f7 is the focal length of the seventh lens 70; f8 is the focal length of the eighth lens 80; n1 is the refractive index of the first lens 10; n2 is the refractive index of the second lens 20; n3 is the refractive index of the third lens 30; n4 is the refractive index of the fourth lens 40; n5 is the refractive index of the fifth lens 50; n6 is the refractive index of the sixth lens 60; n7 is the refractive index of the seventh lens 70; n8 is the refractive index of the eighth lens 80; υ1 is the Abbe number of the first lens 10; υ2 is the Abbe number of the second lens 20; υ3 is the Abbe number of the third lens 30; υ4 is the Abbe number of the fourth lens 40; υ5 is the Abbe number of the fifth lens 50; υ6 is the Abbe number of the sixth lens 60; υ7 is the Abbe number of the seventh lens 70; υ8 is the Abbe number of the eighth lens 80.

[0085] First embodiment

[0086] See also Figure 6 , illustrating the first embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration (longitudinal spherical aberration) on the imaging plane 4 of the first embodiment, please refer to Figure 7 A. For sagittal field curvature, please refer to Figure 7 For B and tangential field curvature, please refer to Figure 7 For C and distortion aberration, please refer to Figure 7 The Y axis of each spherical aberration diagram in all embodiments represents the field of view, and the highest point thereof is 1.0. The Y axis of each aberration diagram and distortion aberration diagram in the embodiments represents the image height. The image height (Image Height, ImgH) of the first embodiment is 5.793 mm.

[0087] The optical imaging lens 1 of the first embodiment is mainly composed of eight lenses with refractive powers, an aperture 2, and an imaging surface 4. The aperture 2 of the first embodiment is disposed on a side of the first lens 10 facing the object side A1.

[0088] The first lens 10 has a positive refractive power. The optical axis region 13 of the object side surface 11 of the first lens 10 is a convex surface and the circumferential region 14 thereof is a convex surface, and the optical axis region 16 of the image side surface 12 of the first lens 10 is a concave surface and the circumferential region 17 thereof is a concave surface. Both the object side surface 11 and the image side surface 12 of the first lens 10 are aspherical surfaces, but the present invention is not limited thereto.

[0089] The second lens 20 has a negative refractive power. The optical axis region 23 of the object side surface 21 of the second lens 20 is a convex surface and the circumferential region 24 thereof is a convex surface, and the optical axis region 26 of the image side surface 22 of the second lens 20 is a concave surface and the circumferential region 27 thereof is a concave surface. Both the object side surface 21 and the image side surface 22 of the second lens 20 are aspherical surfaces, but the present invention is not limited thereto.

[0090] The third lens 30 has a negative refractive power, the optical axis region 33 of the object side surface 31 of the third lens 30 is a concave surface and the circumferential region 34 thereof is a concave surface, the optical axis region 36 of the image side surface 32 of the third lens 30 is a concave surface and the circumferential region 37 thereof is a convex surface. The object side surface 31 and the image side surface 32 of the third lens 30 are both aspherical surfaces, but the present invention is not limited thereto.

[0091] The fourth lens 40 has a positive refractive power, an optical axis region 43 of an object side surface 41 of the fourth lens 40 is a convex surface and a circumferential region 44 thereof is a concave surface, an optical axis region 46 of an image side surface 42 of the fourth lens 40 is a convex surface and a circumferential region 47 thereof is a convex surface. Both the object side surface 41 and the image side surface 42 of the fourth lens 40 are aspherical surfaces, but the present invention is not limited thereto.

[0092] The fifth lens element 50 has a negative refractive power, an optical axis region 53 of an object side surface 51 of the fifth lens element 50 is a convex surface and a circumferential region 54 thereof is a concave surface, an optical axis region 56 of an image side surface 52 of the fifth lens element 50 is a concave surface and a circumferential region 57 thereof is a convex surface. Both the object side surface 51 and the image side surface 52 of the fifth lens element 50 are aspherical surfaces, but the present invention is not limited thereto.

[0093] The sixth lens 60 has a positive refractive power, an optical axis region 63 of an object side surface 61 of the sixth lens 60 is a convex surface and a circumferential region 64 thereof is a concave surface, an optical axis region 66 of an image side surface 62 of the sixth lens 60 is a convex surface and a circumferential region 67 thereof is a convex surface. Both the object side surface 61 and the image side surface 62 of the sixth lens 60 are aspherical surfaces, but the present invention is not limited thereto.

[0094] The seventh lens element 70 has a negative refractive power, an optical axis region 73 of an object-side surface 71 of the seventh lens element 70 is a convex surface and a circumferential region 74 thereof is a concave surface, an optical axis region 76 of an image-side surface 72 of the seventh lens element 70 is a concave surface and a circumferential region 77 thereof is a convex surface. Both the object-side surface 71 and the image-side surface 72 of the seventh lens element 70 are aspherical surfaces, but the present invention is not limited thereto.

[0095] The eighth lens 80 has a negative refractive power, an optical axis region 83 of an object side surface 81 of the eighth lens 80 is a convex surface and a circumferential region 84 thereof is a convex surface, an optical axis region 86 of an image side surface 82 of the eighth lens 80 is a concave surface and a circumferential region 87 thereof is a convex surface. Both the object side surface 81 and the image side surface 82 of the eighth lens 80 are aspherical surfaces, but the present invention is not limited thereto.

[0096] In the optical imaging lens 1 of the present invention, from the first lens 10 to the eighth lens 80, all the object-side surfaces 11 / 21 / 31 / 41 / 51 / 61 / 71 / 81 and the image-side surfaces 12 / 22 / 32 / 42 / 52 / 62 / 72 / 82, a total of 16 curved surfaces, can be aspherical surfaces, but are not limited thereto. If they are aspherical surfaces, they are defined by the following formula:

[0097]

[0098] in:

[0099] Y represents the vertical distance between the point on the aspherical surface and the optical axis I;

[0100] Z represents the depth of the aspherical surface (the vertical distance between a point on the aspherical surface that is Y away from the optical axis I and the tangent plane tangent to the vertex on the aspherical surface optical axis I);

[0101] R represents the radius of curvature of the lens surface near the optical axis I;

[0102] K is the conic constant;

[0103] a i is the i-th order aspheric coefficient, where a of each embodiment 2 The coefficients are all 0.

[0104] First Embodiment The optical data of the optical imaging lens system are as follows: Fig. 20 As shown, the aspheric data is as follows Fig.21 As shown. In the optical imaging lens system of the following embodiments, the aperture value (f-number) of the overall optical imaging lens is Fno, the effective focal length is (EFL), and the half field of view (Half Field of View, referred to as HFOV) is half of the maximum field of view (Field of View) in the overall optical imaging lens, wherein the image height (ImgH), radius of curvature, thickness and focal length of the optical imaging lens are all in millimeters (mm). In this embodiment, EFL = 7.598 mm; HFOV = 40.842 degrees; TTL = 9.477 mm; Fno = 1.677; ImgH = 5.793 mm.

[0105] Second embodiment

[0106] See also Figure 8, illustrating the second embodiment of the optical imaging lens 1 of the present invention. Please note that starting from the second embodiment, in order to simplify and clearly express the diagram, only the optical axis area and the circumference area of ​​each lens that are different from the first embodiment are specially marked on the figure, while the optical axis area and the circumference area of ​​the other lens surfaces that are the same as the first embodiment, such as concave or convex surfaces, are not marked separately. For the longitudinal spherical aberration of the second embodiment on the imaging surface 4, please refer to Fig. 9 For A and sagittal field curvature aberration, please refer to Fig. 9 For B and field curvature aberration in the meridian direction, please refer to Fig. 9 For C and distortion, please refer to Fig. 9 The design of the second embodiment is similar to that of the first embodiment, except that the lens refractive power, lens curvature radius, lens thickness, lens aspheric coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the optical axis area 36 of the image side surface 32 of the third lens 30 is a convex surface, the optical axis area 73 of the object side surface 71 of the seventh lens 70 is a concave surface, and the circumferential area 84 of the object side surface 81 of the eighth lens 80 is a concave surface.

[0107] The detailed optical data of the second embodiment are as follows Fig. 22 As shown, the aspheric data is as follows Fig.23 As shown. In this embodiment, EFL = 8.000 mm; HFOV = 40.842 degrees; TTL = 10.270 mm; Fno = 1.766; ImgH = 6.325 mm. In particular: 1. The longitudinal spherical aberration of this embodiment is better than that of the first embodiment; 2. The distortion aberration of this embodiment is better than that of the first embodiment.

[0108] Third embodiment

[0109] See also Fig.10 , illustrating the third embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the third embodiment on the imaging plane 4, please refer to Fig.11 For A and sagittal field curvature aberration, please refer to Fig.11 For B and field curvature aberration in the meridian direction, please refer to Fig.11 For C and distortion, please refer to Fig.11 The design of the third embodiment is similar to that of the first embodiment, except that the lens refractive power, lens curvature radius, lens thickness, lens aspheric coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the fifth lens 50 has a positive refractive power, the optical axis region 76 of the image side surface 72 of the seventh lens 70 is a convex surface, and the circumferential region 77 of the image side surface 72 of the seventh lens 70 is a concave surface.

[0110] The detailed optical data of the third embodiment are as follows Fig.24 As shown, the aspheric data is as follows Fig.25As shown, in this embodiment, EFL = 7.038 mm; HFOV = 40.842 degrees; TTL = 9.398 mm; Fno = 1.554; ImgH = 6.306 mm. In particular: 1. The system length TTL of this embodiment is shorter than the system length TTL of the first embodiment; 2. The aperture value of this embodiment is smaller than the aperture value of the first embodiment; 3. The distortion aberration of this embodiment is better than the distortion aberration of the first embodiment; 4. The thickness difference between the optical axis area and the circumference area of ​​the lens of this embodiment is smaller than that of the first embodiment, which is easy to manufacture and thus has a higher yield.

[0111] Fourth embodiment

[0112] See also Fig.12 , illustrating the fourth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the fourth embodiment on the imaging plane 4, please refer to Fig.13 For A and sagittal field curvature aberration, please refer to Fig.13 For B and field curvature aberration in the meridian direction, please refer to Fig.13 For C and distortion, please refer to Fig.13 D. The design of the fourth embodiment is similar to that of the first embodiment, except that the lens refractive power, lens curvature radius, lens thickness, lens aspheric coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the optical axis area 33 of the object side surface 31 of the third lens 30 is a convex surface, the circumferential area 37 of the image side surface 32 of the third lens 30 is a concave surface, the fifth lens 50 has a positive refractive power, the sixth lens 60 has a negative refractive power, the optical axis area 66 of the image side surface 62 of the sixth lens 60 is a concave surface, the optical axis area 73 of the object side surface 71 of the seventh lens 70 is a concave surface, the optical axis area 76 of the image side surface 72 of the seventh lens 70 is a convex surface, the eighth lens 80 has a positive refractive power, and the circumferential area 84 of the object side surface 81 of the eighth lens 80 is a concave surface.

[0113] The detailed optical data of the fourth embodiment are as follows Fig.26 As shown, the aspheric data is as follows Fig. 27 As shown. In this embodiment, EFL = 7.587 mm; HFOV = 40.842 degrees; TTL = 9.721 mm; Fno = 1.675; ImgH = 6.133 mm. In particular: 1. The aperture value of this embodiment is smaller than that of the first embodiment; 2. The distortion aberration of this embodiment is better than that of the first embodiment; 3. The thickness difference between the optical axis area and the circumference area of ​​the lens in this embodiment is smaller than that of the first embodiment, which is easy to manufacture and thus has a higher yield.

[0114] Fifth embodiment

[0115] See also Fig.14 , illustrating the fifth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the fifth embodiment on the imaging plane 4, please refer to Fig.15 For A and sagittal field curvature aberration, please refer to Fig.15 For B and field curvature aberration in the meridian direction, please refer to Fig.15 For C and distortion, please refer to Fig.15 D. The design of the fifth embodiment is similar to that of the first embodiment, except that the lens refractive power, lens curvature radius, lens thickness, lens aspheric coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the optical axis area 33 of the object side surface 31 of the third lens 30 is convex, the circumferential area 37 of the image side surface 32 of the third lens 30 is concave, the fourth lens 40 has a negative refractive power, the optical axis area 43 of the object side surface 41 of the fourth lens 40 is concave, and the circumferential area 84 of the object side surface 81 of the eighth lens 80 is concave.

[0116] The detailed optical data of the fifth embodiment are as follows Fig.28 As shown, the aspheric data is as follows Fig.29 As shown, in this embodiment, EFL = 7.036 mm; HFOV = 40.842 degrees; TTL = 9.407 mm; Fno = 1.553; ImgH = 6.076 mm. In particular: 1. The system length TTL of this embodiment is shorter than the system length TTL of the first embodiment; 2. The aperture value of this embodiment is smaller than the aperture value of the first embodiment; 3. The distortion aberration of this embodiment is better than the distortion aberration of the first embodiment.

[0117] Sixth embodiment

[0118] See also Fig.16 , illustrating the sixth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the sixth embodiment on the imaging plane 4, please refer to Fig.17 For A and sagittal field curvature aberration, please refer to Fig.17 For B and field curvature aberration in the meridian direction, please refer to Fig.17 For C and distortion, please refer to Fig.17 D. The design of the sixth embodiment is similar to that of the first embodiment, except that the lens refractive power, lens curvature radius, lens thickness, lens aspheric coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the third lens 30 has a positive refractive power, the optical axis region 33 of the object side surface 31 of the third lens 30 is a convex surface, the optical axis region 43 of the object side surface 41 of the fourth lens 40 is a concave surface, and the circumferential region 84 of the object side surface 81 of the eighth lens 80 is a concave surface.

[0119] The detailed optical data of the sixth embodiment are as follows Fig.30 As shown, the aspheric data is as follows Fig.31As shown, in this embodiment, EFL = 7.031 mm; HFOV = 40.842 degrees; TTL = 9.118 mm; Fno = 1.552; ImgH = 5.874 mm. In particular: 1. The system length TTL of this embodiment is shorter than the system length TTL of the first embodiment; 2. The aperture value of this embodiment is smaller than the aperture value of the first embodiment; 3. The distortion aberration of this embodiment is better than the distortion aberration of the first embodiment.

[0120] Seventh embodiment

[0121] See also Fig.18 , illustrating the seventh embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the seventh embodiment on the imaging plane 4, please refer to Fig.19 For A and sagittal field curvature aberration, please refer to Fig.19 For B and field curvature aberration in the meridian direction, please refer to Fig.19 For C and distortion, please refer to Fig.19 D. The design of the seventh embodiment is similar to that of the first embodiment, except that the lens refractive power, lens curvature radius, lens thickness, lens aspheric coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the optical axis area 33 of the object side surface 31 of the third lens 30 is a convex surface, the circumferential area 37 of the image side surface 32 of the third lens 30 is a concave surface, the optical axis area 43 of the object side surface 41 of the fourth lens 40 is a concave surface, and the circumferential area 84 of the object side surface 81 of the eighth lens 80 is a concave surface.

[0122] The detailed optical data of the seventh embodiment are as follows Fig.32 As shown, the aspheric data is as follows Fig.33 As shown, in this embodiment, EFL = 7.030 mm; HFOV = 40.845 degrees; TTL = 9.216 mm; Fno = 1.552; ImgH = 5.935 mm. In particular: 1. The system length TTL of this embodiment is shorter than the system length TTL of the first embodiment; 2. The aperture value of this embodiment is smaller than the aperture value of the first embodiment; 3. The half angle of view of this embodiment is larger than the half angle of view of the first embodiment; 4. The distortion aberration of this embodiment is better than the distortion aberration of the first embodiment.

[0123] In addition, the important parameters of each embodiment are summarized in Fig.34 and Fig.35 middle.

[0124] The embodiments of the present invention are advantageous for providing an optical imaging lens 1 with a small aperture value, a large image height, and improved resolution while maintaining a system length, maintaining good imaging quality, and being technically feasible:

[0125] 1. The optical imaging lens 1 of the present invention satisfies the conditions that the second lens element 20 has a negative refractive power, the circumferential region 34 of the object side surface 31 of the third lens element 30 is a concave surface, the seventh lens element 70 has a negative refractive power, and the circumferential region 87 of the image side surface 82 of the eighth lens element 80 is a convex surface, which is conducive to designing a lens with a large aperture and a large image height.

[0126] 2. The optical imaging lens 1 of the present invention further limits the combination of technical features (a) to (c) to have the same effect, which is beneficial to improving the manufacturing yield and enhancing manufacturability:

[0127] (a) The third lens 30 has a negative refractive power, the optical axis region 83 of the object side surface 81 of the eighth lens 80 is a convex surface, and Tavg567 / Tstd567≧3.600, and the preferred range is 3.600≦Tavg567 / Tstd567≦16.000. If the third lens 30 has a negative refractive power, it is more conducive to controlling the turning of light and eliminating the aberration of the inner field of view (0.2 field of view to 0.4 field of view), and further limiting the first lens 10 to have a positive refractive power is conducive to shortening the system length.

[0128] (b) The optical axis region 53 of the object side surface 51 of the fifth lens 50 is convex, the circumferential region 54 of the object side surface 51 of the fifth lens 50 is concave, the optical axis region 63 of the object side surface 61 of the sixth lens 60 is convex, and Tavg567 / Tstd567≧4.600, and the preferred range is 4.600≦Tavg567 / Tstd567≦16.000. Further limiting the first lens 10 to have a positive refractive power is conducive to shortening the system length, wherein Tavg567 / Tstd567≧4.600 is more conducive to improving the manufacturing yield of the fifth lens to the seventh lens.

[0129] (c) The optical axis region 53 of the object-side surface 51 of the fifth lens 50 is convex, the circumferential region 57 of the image-side surface 52 of the fifth lens 50 is convex, the optical axis region 63 of the object-side surface 61 of the sixth lens 60 is convex, and Tavg567 / Tstd567≧4.600. The preferred range is 4.600≦Tavg567 / Tstd567≦16.000. If the combination satisfies that the first lens 10 has a positive refractive power, it is beneficial to shorten the system length. Among them, Tavg567 / Tstd567≧4.600 is more beneficial to improving the manufacturing yield of the fifth to seventh lenses.

[0130] 3. The optical imaging lens of the present invention satisfies υ3+υ4≧55.000, υ4+υ5≧55.000, υ6+υ7≦100.000 or υ7+υ8≦100.00, which is beneficial to improve the MTF (modulation transfer function) of the optical imaging lens to increase the resolution. The preferred range is 55.000≦υ3+υ4≦120.000, 55.000≦υ4+υ5≦ 120.000, 38.000≦υ6+υ7≦100.000 or 38.000≦υ7+υ8≦100.00, and the optimal range is 55.000≦υ3+υ4≦95.000, 55.000≦υ4+υ5≦95.000, 60.000≦υ6+υ7≦100.000 or 60.000≦υ7+υ8≦100.00.

[0131] 4. The optical imaging lens 1 of the present invention further satisfies the following conditional formula, which helps to maintain the thickness and spacing of each lens at an appropriate value under the premise of providing a lens with a large aperture and a large image height, and avoids any parameter being too large and thus detrimental to the overall thinning of the optical imaging lens, or avoids any parameter being too small and thus affecting assembly or increasing the difficulty of manufacturing:

[0132] 1) 7.000≦(EFL+AAG) / BFL, the optimal range is 7.000≦(EFL+AAG) / BFL≦22.000;

[0133] 2) 4.400≦(TL+ImgH) / D11t32, the preferred range is 4.400≦(TL+ImgH) / D11t32≦7.000;

[0134] 3) (T1+D12t31) / (G34+T4)≦5.300, the preferred range is 1.000≦(T1+D12t31) / (G34+T4)≦5.300;

[0135] 4) (D12t31+T3) / (G45+T5)≦3.300, the optimal range is 0.900≦(D12t31+T3) / (G45+T5)≦3.300;

[0136] 5) 2.800≦Tavg5678 / Tstd5678, the optimal range is 2.800≦Tavg5678 / Tstd5678≦17.000;

[0137] 6) D52t71 / T7≦2.700, the preferred range is 1.600≦D52t71 / T7≦2.700;

[0138] 7) (D11t32+D52t71) / (T7+G78)≦7.000, the preferred range is 2.000≦(D11t32+D52t71) / (T7+G78)≦7.000;

[0139] 8) (D52t71+BFL) / (T7+G78)≦3.610, the preferred range is 1.000≦(D52t71+BFL) / (T7+G78)≦3.610;

[0140] 9) Fno*D11t32 / (G78+T8)≦4.000, the preferred range is 2.400≦Fno*D11t32 / (G78+T8)≦4.000;

[0141] 10) Fno*D52t82 / D32t52≦5.000, the preferred range is 1.900≦Fno*D52t82 / D32t52≦5.000;

[0142] 11) ALT / D32t52≦5.300, the preferred range is 1.800≦ALT / D32t52≦5.300;

[0143] 12) 5.800≦(EPD+ImgH) / (Tmax+Tmin), the preferred range is 5.800≦(EPD+ImgH) / (Tmax+Tmin)≦8.000;

[0144] 13)5.000≦(TTL+ImgH) / (T1+T3+T8), the optimal range is 5.000≦(TTL+ImgH) / (T1+T3+T8)≦10.000.

[0145] In addition, any combination of parameters of the embodiment may be selected to increase lens restrictions, so as to facilitate the lens design of the same architecture of the present invention.

[0146] In view of the unpredictability of optical system design, under the framework of the present invention, meeting the above conditions can better shorten the length of the lens of the present invention, increase the available aperture, improve the imaging quality, or improve the assembly yield, thereby improving the shortcomings of the prior art.

[0147] The exemplary limiting relationships listed above can also be arbitrarily and selectively combined in different quantities and applied to the implementation of the present invention, and are not limited thereto. When implementing the present invention, in addition to the aforementioned relationships, other detailed structures such as the arrangement of concave and convex surfaces of other lenses can also be additionally designed for a single lens or for multiple lenses in a broad sense to enhance the control of system performance and / or resolution. It should be noted that these details need to be selectively combined and applied to other embodiments of the present invention without conflict.

[0148] 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:

[0149] (1) The range of optical parameters, such as α 2 ≦A≦α 1 or β 2 ≦B≦β 1 , α 1 is the maximum value of the optical parameter A in multiple embodiments, α 2 is the minimum value of the optical parameter A in multiple embodiments, β 1 is the maximum value of the optical parameter B in multiple embodiments, β 2 is the minimum value of the optical parameter B in multiple embodiments.

[0150] (2) The comparative relationship between optical parameters, for example: A is greater than B or A is less than B.

[0151] (3) The conditional range covered by multiple embodiments, specifically, the combination relationship or proportional relationship obtained by possible calculation of multiple optical parameters of the same embodiment, these relationships are defined as E. E can be, for example: A+B or AB or A / B or A*B or (A*B) 1 / 2 , and E satisfies the condition E≦γ 1 or E ≧ γ 2 or γ 2 ≦E≦γ 1 , γ 1 and γ 2 is the value obtained by calculating the optical parameter A and the optical parameter B of the same embodiment, and γ 1 is the maximum value among multiple embodiments of the present invention, γ 2 It is the minimum value among the multiple embodiments of the present invention.

[0152] The ranges covered by the above optical parameters, the comparison relationship between the optical parameters, and the maximum value, minimum value, and numerical range within the maximum value and minimum value of the conditional expressions are all features that can be implemented by the present invention, and all belong to the scope disclosed by the present invention. The above is only an example and should not be limited to this.

[0153] All embodiments of the present invention can be implemented, and some feature combinations can be extracted from the same embodiment. Compared with the prior art, the feature combination can also achieve unexpected effects of the present case. The feature combination includes but is not limited to the combination of features such as face shape, refractive index and conditional formula. The disclosure of the embodiments of the present invention is a specific embodiment to illustrate the principles of the present invention, and the present invention should not be limited to the disclosed embodiments. In other words, the embodiments and their drawings are only for demonstration of the present invention and are not limited thereto.

[0154] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. An optical imaging lens, comprising, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, wherein each of the first lens to the eighth lens comprises an object-side surface facing the object side and allowing imaging light to pass therethrough, and an image-side surface facing the image side and allowing imaging light to pass therethrough; characterized in that: The first lens has a positive refractive power, an optical axis region of the object side surface of the first lens is a convex surface, a circumferential region of the object side surface of the first lens is a convex surface, an optical axis region of the image side surface of the first lens is a concave surface, and a circumferential region of the image side surface of the first lens is a concave 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, a circumferential 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; The third lens has a negative refractive power and a circumferential area of ​​the object-side surface of the third lens is a concave surface; A circumferential area of ​​the object side surface of the fourth lens is a concave surface, an optical axis area of ​​the image side surface of the fourth lens is a convex surface, and a circumferential area 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 convex surface, a circumferential region of the object side surface of the fifth lens is a concave surface, an optical axis region of the image side surface of the fifth lens is a concave surface, and a circumferential region of the image side surface of the fifth lens is a convex surface; An optical axis region of the object-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 element has a negative refractive power and a circumferential area of ​​the object-side surface of the seventh lens element is a concave surface; and An optical axis region of the object side surface of the eighth lens is a convex surface, a circumferential region of the image side surface of the eighth lens is a convex surface, and an optical axis region of the image side surface of the eighth lens is a concave surface; The optical imaging lens comprises only the eight lenses mentioned above, Tavg567 is defined as an average value of the thicknesses of the three lenses from the fifth lens to the seventh lens on the optical axis, Tstd567 is defined as a matrix standard deviation of the thicknesses of the three lenses from the fifth lens to the seventh lens on the optical axis, Fno is defined as an aperture value of the optical imaging lens, T8 is defined as the thickness of the eighth lens on the optical axis, G78 is defined as an air gap from the seventh lens to the eighth lens on the optical axis, D11t32 is defined as a distance from the object side surface of the first lens to the image side surface of the third lens on the optical axis, and Tavg567 / Tstd567≧3.600 and Fno*D11t32 / (G78+T8)≦4.000 are satisfied.

2. An optical imaging lens, comprising, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, wherein each of the first lens to the eighth lens comprises an object-side surface facing the object side and allowing imaging light to pass therethrough, and an image-side surface facing the image side and allowing imaging light to pass therethrough; characterized in that: The first lens has a positive refractive power, an optical axis region of the object side surface of the first lens is a convex surface, a circumferential region of the object side surface of the first lens is a convex surface, an optical axis region of the image side surface of the first lens is a concave surface, and a circumferential region of the image side surface of the first lens is a concave 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, a circumferential 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; A circumferential area of ​​the object side surface of the fourth lens is a concave surface, an optical axis area of ​​the image side surface of the fourth lens is a convex surface, and a circumferential area 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 convex surface, a circumferential region of the object side surface of the fifth lens is a concave surface, an optical axis region of the image side surface of the fifth lens is a concave surface, and a circumferential region of the image side surface of the fifth lens is a convex surface; An optical axis region of the object-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 element has a negative refractive power and a circumferential area of ​​the object-side surface of the seventh lens element is a concave surface; and A circumferential area of ​​the image-side surface of the eighth lens is a convex surface, an optical axis area of ​​the object-side surface of the eighth lens is a convex surface, and an optical axis area of ​​the image-side surface of the eighth lens is a concave surface; The optical imaging lens comprises only the eight lenses mentioned above, Tavg567 is defined as an average value of the thicknesses of the three lenses from the fifth lens to the seventh lens on the optical axis, Tstd567 is defined as a matrix standard deviation of the thicknesses of the three lenses from the fifth lens to the seventh lens on the optical axis, Fno is defined as an aperture value of the optical imaging lens, T8 is defined as the thickness of the eighth lens on the optical axis, G78 is defined as an air gap from the seventh lens to the eighth lens on the optical axis, D11t32 is defined as a distance from the object side surface of the first lens to the image side surface of the third lens on the optical axis, and Tavg567 / Tstd567≧4.600 and Fno*D11t32 / (G78+T8)≦4.000 are satisfied.

3. The optical imaging lens according to claim 1 or 2, characterized in that: Wherein υ3 is defined as the Abbe number of the third lens, υ4 is defined as the Abbe number of the fourth lens, and the optical imaging lens satisfies the following condition: 55.000≦υ3+υ4.

4. The optical imaging lens according to claim 1 or 2, characterized in that: Wherein υ7 is defined as the Abbe number of the seventh lens, υ8 is defined as the Abbe number of the eighth lens, and the optical imaging lens satisfies the following condition: υ7+υ8≦100.

000.

5. The optical imaging lens according to claim 1 or 2, characterized in that: Wherein, T1 is defined as the thickness of the first lens on the optical axis, T4 is defined as the thickness of the fourth lens on the optical axis, G34 is defined as the air gap between the third lens and the fourth lens on the optical axis, D12t31 is defined as the distance from the image side surface of the first lens to the object side surface of the third lens on the optical axis, and the optical imaging lens satisfies the following condition: (T1+D12t31) / (G34+T4)≦5.

300.

6. The optical imaging lens according to claim 1 or 2, characterized in that: Wherein T7 is defined as the thickness of the seventh lens on the optical axis, D52t71 is defined as the distance from the image side surface of the fifth lens to the object side surface of the seventh lens on the optical axis, and the optical imaging lens satisfies the following condition: D52t71 / T7≦2.

700.

7. The optical imaging lens according to claim 1 or 2, characterized in that: Wherein, EPD is defined as an entrance pupil diameter of the optical imaging lens, ImgH is defined as an image height of the optical imaging lens, Tmax is defined as a maximum value of the thicknesses of eight lenses from the first lens to the eighth lens on the optical axis, Tmin is defined as a minimum value of the thicknesses of eight lenses from the first lens to the eighth lens on the optical axis, and the optical imaging lens satisfies the following condition: 5.800≦(EPD+ImgH) / (Tmax+Tmin).

8. The optical imaging lens according to claim 1 or 2, characterized in that: Wherein υ4 is defined as the Abbe number of the fourth lens, υ5 is defined as the Abbe number of the fifth lens, and the optical imaging lens satisfies the following condition: 55.000≦υ4+υ5.

9. The optical imaging lens according to claim 1 or 2, characterized in that: Wherein, EFL is defined as the effective focal length of the optical imaging lens, AAG is defined as the sum of seven air gaps from the first lens to the eighth lens on the optical axis, BFL is defined as the distance from the image side surface of the eighth lens to an imaging surface on the optical axis, and the optical imaging lens satisfies the following condition: 7.000≦(EFL+AAG) / BFL.

10. The optical imaging lens according to claim 1 or 2, characterized in that: Wherein T3 is defined as the thickness of the third lens on the optical axis, T5 is defined as the thickness of the fifth lens on the optical axis, G45 is defined as the air gap between the fourth lens and the fifth lens on the optical axis, D12t31 is defined as the distance from the image side surface of the first lens to the object side surface of the third lens on the optical axis, and the optical imaging lens satisfies the following condition: (D12t31+T3) / (G45+T5)≦3.

300.

11. The optical imaging lens according to claim 1 or 2, characterized in that: Wherein T7 is defined as the thickness of the seventh lens on the optical axis, D52t71 is defined as the distance from the image side surface of the fifth lens to the object side surface of the seventh lens on the optical axis, and the optical imaging lens satisfies the following condition: (D11t32+D52t71) / (T7+G78)≦7.

000.

12. The optical imaging lens according to claim 1 or 2, characterized in that: Wherein D52t82 is defined as the distance from the image side surface of the fifth lens to the image side surface of the eighth lens on the optical axis, D32t52 is defined as the distance from the image side surface of the third lens to the image side surface of the fifth lens on the optical axis, and the optical imaging lens satisfies the following condition: Fno*D52t82 / D32t52≦5.

000.

13. The optical imaging lens according to claim 1 or 2, characterized in that: Wherein TTL is defined as the distance from the object side surface of the first lens to an imaging surface on the optical axis, ImgH is defined as the image height of the optical imaging lens, T1 is defined as the thickness of the first lens on the optical axis, T3 is defined as the thickness of the third lens on the optical axis, and the optical imaging lens satisfies the following condition: 5.000≦(TTL+ImgH) / (T1+T3+T8).

14. The optical imaging lens according to claim 1 or 2, characterized in that: Wherein υ6 is defined as the Abbe number of the sixth lens, υ7 is defined as the Abbe number of the seventh lens, and the optical imaging lens satisfies the following condition: υ6+υ7≦100.

000.

15. The optical imaging lens according to claim 1 or 2, characterized in that: Wherein TL is defined as the distance from the object side surface of the first lens to the image side surface of the eighth lens on the optical axis, ImgH is defined as the image height of the optical imaging lens, and the optical imaging lens satisfies the following condition: 4.400≦(TL+ImgH) / D11t32.

16. The optical imaging lens according to claim 1 or 2, characterized in that: Wherein, Tavg5678 is defined as the average value of the thicknesses of four lenses from the fifth lens to the eighth lens on the optical axis, Tstd5678 is defined as the parent standard deviation of the thicknesses of four lenses from the fifth lens to the eighth lens on the optical axis, and the optical imaging lens satisfies the following condition: 2.800≦Tavg5678 / Tstd5678.

17. The optical imaging lens according to claim 1 or 2, characterized in that: Wherein BFL is defined as the distance from the image side surface of the eighth lens to an imaging plane on the optical axis, T7 is defined as the thickness of the seventh lens on the optical axis, D52t71 is defined as the distance from the image side surface of the fifth lens to the object side surface of the seventh lens on the optical axis, and the optical imaging lens satisfies the following condition: (D52t71+BFL) / (T7+G78)≦3.

610.

18. The optical imaging lens according to claim 1 or 2, characterized in that: ALT is defined as the sum of thicknesses of eight lenses from the first lens to the eighth lens on the optical axis, D32t52 is defined as the distance from the image side surface of the third lens to the image side surface of the fifth lens on the optical axis, and the optical imaging lens satisfies the following condition: ALT / D32t52≦5.300.

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