Optical imaging lens

Abstract

An optical imaging lens includes first to sixth lenses. The circumferential area of the image side surface of the first lens is a convex surface, the circumferential area of the image side surface of the second lens is a concave surface, the optical axis area of the object side surface of the fourth lens is a convex surface, the circumferential area of the object side surface of the fourth lens is a concave surface, the circumferential area of the image side surface of the fourth lens is a concave surface, and the optical axis area of the object side surface of the fifth lens is a concave surface. The optical imaging lens only comprises the six lenses, and (T5 + BFL) / (T1 + G12) is larger than or equal to 4.390.

Description

Technical Field

[0001] The present invention generally relates to an optical imaging lens. Specifically, the present invention is particularly directed to an optical imaging lens that is mainly used for shooting images and recording videos and is applied to portable electronic products, such as mobile phones, cameras, tablet computers, personal digital assistants (PDAs) or head-mounted displays (AR, VR, MR) and other electronic devices. Background Art

[0002] In recent years, optical imaging lenses have been continuously evolving and have been applied in a wider range of fields. 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 angle is gradually becoming a trend. Therefore, how to design an optical imaging lens that is both thin, light, and short, has a small aperture value, and has good imaging quality has become a challenge that needs to be solved. Summary of the invention

[0003] Therefore, each embodiment of the present invention provides a six-piece optical imaging lens with a small aperture value, a small size, excellent imaging quality, and technical feasibility. The six-piece optical imaging lens of the present invention is arranged in sequence on the optical axis from the object side to the image side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth 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.

[0004] In one embodiment of the present invention, the circumferential area of ​​the image side surface of the first lens is convex, the circumferential area of ​​the image side surface of the second lens is concave, the optical axis area of ​​the object side surface of the fourth lens is convex, the circumferential area of ​​the object side surface of the fourth lens is concave and the circumferential area of ​​the image side surface of the fourth lens is concave, and the optical axis area of ​​the object side surface of the fifth lens is concave. The optical imaging lens has only the above six lenses, and satisfies (T5+BFL) / (T1+G12)≥4.390.

[0005] In another embodiment of the present invention, the circumferential area of ​​the image side surface of the first lens is convex, the circumferential area of ​​the object side surface of the second lens is convex and the circumferential area of ​​the image side surface of the second lens is concave, the optical axis area of ​​the object side surface of the fourth lens is convex and the circumferential area of ​​the image side surface of the fourth lens is concave, and the optical axis area of ​​the object side surface of the sixth lens is convex and the optical axis area of ​​the image side surface of the sixth lens is concave. The optical imaging lens has only the above six lenses and satisfies (T5+BFL) / (T1+G12)≥4.390.

[0006] In another embodiment of the present invention, the circumferential area of ​​the image side surface of the first lens is convex, the circumferential area of ​​the image side surface of the second lens is concave, the circumferential area of ​​the image side surface of the third lens is convex, the circumferential area of ​​the object side surface of the fourth lens is concave, the circumferential area of ​​the image side surface of the fourth lens is concave, the optical axis area of ​​the object side surface of the fifth lens is concave, and the optical axis area of ​​the image side surface of the sixth lens is concave. The optical imaging lens has only the above six lenses, and satisfies (T5+BFL) / (T1+G12)≥4.390.

[0007] In the optical imaging lens of the present invention, each embodiment may also selectively meet the following conditions:

[0008] (T3+T5) / T1≥2.400;

[0009] (G23+T3+T5) / AAG≥1.500;

[0010] (T5+T6) / Tavg≥2.600;

[0011] EFL*Fno / Tavg≤14.000;

[0012] T3 / (G34+G56)≥3.000;

[0013] TTL / (G12+G23+G34+G56)≥12.400;

[0014] ALT / (T3+T5+T6)≤1.650;

[0015] EFL / BFL≤2.500;

[0016] ALT / AAG ≥ 2.900;

[0017] ImgH / (T2+G23+T4+G45+T6)≥1.500;

[0018] BFL / (G12+G34+G56)≥9.200;

[0019] (EFL+TL) / (T2+G23+T4+G45+T6+BFL)≤2.300;

[0020] (Tmax+BFL) / (Tmin+AAG)≥1.600;

[0021] EFL / (BFL+T5)≤1.600;

[0022] BFL / (G12+G23+G34)≥3.200;

[0023] (T3+G34+T4+G45+T5) / (T1+G12+T2)≥2.100;

[0024] (T5+T6+BFL) / (T1+G12+T2+G23)≥2.700;

[0025] ALT / (G23+T3+BFL)≤1.500;

[0026] AAG / T5≤1.700.

[0027] Wherein, T1 is defined as the thickness of the first lens on the optical axis; T2 is defined as the thickness of the second lens on the optical axis; T3 is defined as the thickness of the third lens on the optical axis; T4 is defined as the thickness of the fourth lens on the optical axis; T5 is defined as the thickness of the fifth lens on the optical axis; and T6 is defined as the thickness of the sixth lens on the optical axis. Tmax is the maximum value of the six lens thicknesses of the first lens to the sixth lens on the optical axis, that is, the maximum value among T1, T2, T3, T4, T5, and T6. Tmin is the minimum value of the six lens thicknesses of the first lens to the sixth lens on the optical axis, that is, the minimum value among T1, T2, T3, T4, T5, and T6. Tavg is the average value of the six lens thicknesses of the first lens to the sixth lens on the optical axis, that is, the average value of T1, T2, T3, T4, T5, and T6.

[0028] G12 is defined as the air gap distance between the first lens and the second lens on the optical axis; G23 is defined as the air gap distance between the second lens and the third lens on the optical axis; G34 is defined as the air gap distance between the third lens and the fourth lens on the optical axis; G45 is defined as the air gap distance between the fourth lens and the fifth lens on the optical axis; G56 is defined as the air gap distance between the fifth lens and the sixth lens on the optical axis.

[0029] Fno is defined as the aperture value of the optical imaging lens; AAG is defined as the sum of the five air gap distances from the first lens to the sixth lens on the optical axis; ImgH is defined as the image height of the optical imaging lens; TL is defined as the distance from the object side of the first lens to the image side of the sixth lens on the optical axis; ALT is defined as the sum of the thicknesses of the six lenses from the first lens to the sixth lens on the optical axis; TTL is defined as the distance from the object side of the first lens to the imaging plane on the optical axis; BFL is defined as the distance from the image side of the sixth lens to the imaging plane on the optical axis; HFOV is the half viewing angle of the optical imaging lens; EFL is defined as the effective focal length of the optical imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram showing the method for determining the curvature shape of the optical imaging lens of the present invention Figure 1 .

[0031] Figure 2 Schematic diagram showing the method for determining the curvature shape of the optical imaging lens of the present invention Figure 2 .

[0032] Figure 3 Schematic diagram showing the method for determining the curvature shape of the optical imaging lens of the present invention Figure 3 .

[0033] Figure 4 Schematic diagram showing the method for determining the curvature shape of the optical imaging lens of the present invention Figure 3 .

[0034] Figure 5 Schematic diagram showing the method for determining the curvature shape of the optical imaging lens of the present invention Figure 4 .

[0035] Figure 6 A schematic diagram of a first embodiment of the optical imaging lens of the present invention is shown.

[0036] Figure 7 Parameter diagrams of the first embodiment of the optical imaging lens of the present invention are shown; wherein A is the longitudinal spherical aberration on the imaging plane; B is the field curvature aberration in the sagittal direction; C is the field curvature aberration in the tangential direction; and D is the distortion aberration.

[0037] Figure 8 A schematic diagram of a second embodiment of the optical imaging lens of the present invention is shown.

[0038] Fig. 9 Parameter diagrams of the second embodiment of the optical imaging lens of the present invention are shown; wherein A is the longitudinal spherical aberration on the imaging plane; B is the field curvature aberration in the sagittal direction; C is the field curvature aberration in the tangential direction; and D is the distortion aberration.

[0039] Fig.10 A schematic diagram of a third embodiment of the optical imaging lens system of the present invention is shown.

[0040] Fig.11 Parameter diagrams of the third embodiment of the optical imaging lens of the present invention are shown; wherein A is the longitudinal spherical aberration on the imaging plane; B is the field curvature aberration in the sagittal direction; C is the field curvature aberration in the tangential direction; and D is the distortion aberration.

[0041] Fig.12 A schematic diagram of a fourth embodiment of the optical imaging lens system of the present invention is shown.

[0042] Fig.13 Parameter diagrams of the fourth embodiment of the optical imaging lens of the present invention are shown; wherein A is the longitudinal spherical aberration on the imaging plane; B is the field curvature aberration in the sagittal direction; C is the field curvature aberration in the tangential direction; and D is the distortion aberration.

[0043] Fig.14A schematic diagram of a fifth embodiment of the optical imaging lens system of the present invention is shown.

[0044] Fig.15 Parameter diagrams of the fifth embodiment of the optical imaging lens of the present invention are shown; wherein A is the longitudinal spherical aberration on the imaging plane; B is the field curvature aberration in the sagittal direction; C is the field curvature aberration in the tangential direction; and D is the distortion aberration.

[0045] Fig.16 A schematic diagram of a sixth embodiment of the optical imaging lens system of the present invention is shown.

[0046] Fig.17 Parameter diagrams of the sixth embodiment of the optical imaging lens of the present invention are shown; wherein A is the longitudinal spherical aberration on the imaging plane; B is the field curvature aberration in the sagittal direction; C is the field curvature aberration in the tangential direction; and D is the distortion aberration.

[0047] Fig.18 A schematic diagram of a seventh embodiment of the optical imaging lens system of the present invention is shown.

[0048] Fig.19 Parameter diagrams of the seventh embodiment of the optical imaging lens of the present invention are shown; wherein A is the longitudinal spherical aberration on the imaging plane; B is the field curvature aberration in the sagittal direction; C is the field curvature aberration in the tangential direction; and D is the distortion aberration.

[0049] Fig. 20 A schematic diagram illustrating an eighth embodiment of the optical imaging lens system of the present invention is shown.

[0050] Fig.21 Parameter diagrams of the eighth embodiment of the optical imaging lens of the present invention are shown; wherein A is the longitudinal spherical aberration on the imaging plane; B is the field curvature aberration in the sagittal direction; C is the field curvature aberration in the tangential direction; and D is the distortion aberration.

[0075] Fig. 22 Detailed optical data of the first embodiment are shown.

[0076] Fig.23 Detailed aspherical surface data of the first embodiment are shown.

[0077] Fig.24 Detailed optical data of the second embodiment are shown.

[0078] Fig.25 Detailed aspherical surface data of the second embodiment are shown.

[0079] Fig.26 Detailed optical data of the third embodiment are shown.

[0080] Fig. 27 Detailed aspherical surface data of the third embodiment are shown.

[0081] Fig.28 Detailed optical data of the fourth embodiment are shown.

[0082] Fig.29 Detailed aspherical surface data of the fourth embodiment are shown.

[0083] Fig.30 Detailed optical data of the fifth embodiment are shown.

[0084] Fig.31 Detailed aspherical surface data of the fifth embodiment are shown.

[0085] Fig.32 Detailed optical data of the sixth embodiment are shown.

[0086] Fig.33 Detailed aspherical surface data of the sixth embodiment are shown.

[0087] Fig.34 Detailed optical data of the seventh embodiment are shown.

[0088] Fig.35 Detailed aspherical surface data of the seventh embodiment are shown.

[0089] Fig.36 Detailed optical data of the eighth embodiment are shown.

[0090] Fig.37 Detailed aspherical surface data of the eighth embodiment are shown.

[0091] Fig.38 Indicates important parameters of each embodiment.

[0092] Reference numerals:

[0093] 1…optical imaging lens; 2…aperture; 3…filter; 4…imaging surface; 11, 21, 31, 41, 51, 61, 110, 410, 510…object side; 12, 22, 32, 42, 52, 62, 120, 320…image side;

[0094] 13, 16, 23, 26, 33, 36, 43, 46, 53, 56, 63, 66, Z1…optical axis area;

[0095] 14, 17, 24, 27, 34, 37, 44, 47, 54, 57, 64, 67, Z2…circumferential area;

[0096] 10…first lens; 20…second lens; 30…third lens; 40…fourth lens; 50…fifth lens;

[0097] 60…sixth lens; 100, 200, 300, 400, 500…lenses;

[0098] 130…assembly unit; 211, 212…parallel light rays; A1…object side; A2…image side; CP…center point;

[0099] CP1…first center point; CP2…second center point; TP1…first transition point; TP2…second transition point;

[0100] OB…optical boundary; I…optical axis; Lc…chief ray; Lm…marginal ray; EL…extension line;

[0101] Z3…relay area; M, R…intersection point. DETAILED DESCRIPTION

[0102] 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.

[0103] 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.

[0104] 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 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).

[0105] 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.

[0106] 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.

[0107] 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 component (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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] like Figure 6 As shown, the optical imaging lens 1 of the present invention is mainly composed of six 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 an aperture stop 2, a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60 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, and the sixth lens 60 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 have six lenses, namely, the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, and the sixth lens 60. 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.

[0117] In addition, the optical imaging lens 1 also includes an aperture 2, which is disposed at an appropriate position. Figure 6In the embodiment, the aperture 2 is disposed on the side of the first lens 10 facing the object side A1, that is, disposed between the object side A1 and the first lens 10. 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, it will sequentially pass 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 and the filter 3, and then will be 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 sixth lens 60 and the imaging plane 4, and it can be a filter with various suitable functions, such as an infrared cut-off 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.

[0118] 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; and the sixth lens 60 has an object-side surface 61 and an image-side surface 62. Each object-side surface and each image-side surface has an optical axis region and a circumferential region, respectively.

[0119] 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, and the sixth lens 60 has a sixth lens thickness T6. ALT is the sum of the six lens thicknesses of the first lens 10 to the sixth lens 60 on the optical axis I in the optical imaging lens 1 of the present invention. That is, ALT=T1+T2+T3+T4+T5+T6. Tavg is the average value of the six lens thicknesses of the first lens 10 to the sixth lens 60 on the optical axis I, that is, the average value of T1, T2, T3, T4, T5, and T6. Tmax is the maximum value of the six lens thicknesses of the first lens 10 to the sixth lens 60 on the optical axis I, that is, the maximum value among T1, T2, T3, T4, T5, and T6. Tmin is the minimum value of the six lens thicknesses of the first lens 10 to the sixth lens 60 on the optical axis I, that is, the minimum value among T1, T2, T3, T4, T5, and T6.

[0120] In addition, in the optical imaging lens 1 of the present invention, each lens has an air gap distance on the optical axis I. For example, the air gap distance between the first lens 10 and the second lens 20 is called G12, the air gap distance between the second lens 20 and the third lens 30 is called G23, the air gap distance between the third lens 30 and the fourth lens 40 is called G34, the air gap distance between the fourth lens 40 and the fifth lens 50 is called G45, and the air gap distance between the fifth lens 50 and the sixth lens 60 is called G56. Therefore, the sum of the five air gap distances between the lenses on the optical axis I from the first lens 10 to the sixth lens 60 is called AAG. That is, AAG=G12+G23+G34+G45+G56. Gmax is the maximum value of the five air gap distances on the optical axis I from the first lens 10 to the sixth lens 60, that is, the maximum value among G12, G23, G34, G45, and G56.

[0121] 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 62 of the sixth lens 60 on the optical axis I is TL. ImgH (image height) is the image height of the optical imaging lens 1. Fno is the aperture value of the optical imaging lens 1. HFOV is the half viewing angle of the optical imaging lens 1, that is, half of the maximum viewing angle (Field of View).

[0122] When the filter 3 is arranged between the sixth lens 60 and the imaging plane 4, G6F represents the air gap distance from the sixth lens 60 to 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 distance from the filter 3 to 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 62 of the sixth lens 60 to the imaging plane 4 on the optical axis I, that is, BFL=G6F+TF+GFP.

[0123] 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; n1 is the nd refractive index of the first lens 10; n2 is the nd refractive index of the second lens 20; n3 is the nd refractive index of the third lens 30; n4 is the nd refractive index of the fourth lens 40; n5 is the nd refractive index of the fifth lens 50; n6 is the nd refractive index of the sixth lens 60; υ1 is the Vd Abbe number of the first lens 10; υ2 is the Vd Abbe number of the second lens 20; υ3 is the Vd Abbe number of the third lens 30; υ4 is the Vd Abbe number of the fourth lens 40; υ5 is the Vd Abbe number of the fifth lens 50; υ6 is the Vd Abbe number of the sixth lens 60.

[0124] First embodiment

[0125] 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 B. For field curvature aberration in the tangential direction, please refer to Figure 7 C. For distortion aberration, please refer to Figure 7 D. 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 diagram in each embodiment represents the image height, and the image height of the first embodiment is 2.900 mm.

[0126] The optical imaging lens 1 of the first embodiment mainly consists of six lenses with refractive powers, namely, a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50 and a sixth lens 60, an aperture 2, and an imaging surface 4. The aperture 2 of the first embodiment is disposed on the side of the first lens 10 facing the object side A1.

[0127] 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 concave surface, and the optical axis region 16 of the image side surface 12 of the first lens 10 is a convex surface and the circumferential region 17 thereof is a convex 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.

[0128] 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.

[0129] 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 and the circumferential region 34 thereof is a convex surface. The optical axis region 36 of the image side surface 32 of the third lens 30 is a convex 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.

[0130] The fourth lens element 40 has a negative refractive power, an optical axis region 43 of an object side surface 41 of the fourth lens element 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 element 40 is a concave surface and a circumferential region 47 thereof is a concave surface. Both the object side surface 41 and the image side surface 42 of the fourth lens element 40 are aspherical surfaces, but the present invention is not limited thereto.

[0131] The fifth lens element 50 has a positive refractive power, an optical axis region 53 of an object-side surface 51 of the fifth lens element 50 is a concave 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 convex 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.

[0132] The sixth lens 60 has a negative 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 concave 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.

[0133] In the optical imaging lens 1 of the present invention, from the first lens 10 to the sixth lens 60, all the twelve curved surfaces, namely, the object side surface 11 / 21 / 31 / 41 / 51 / 61 and the image side surface 12 / 22 / 32 / 42 / 52 / 62, can be aspherical surfaces, but the invention is not limited thereto. If they are aspherical surfaces, they are defined by the following formula:

[0134]

[0135] in:

[0136] Y represents the vertical distance between the point on the aspherical surface and the optical axis I;

[0137] Z represents the depth of the aspherical surface (the vertical distance between the point on the aspherical surface that is Y away from the optical axis I and the tangent plane that is tangent to the vertex on the aspherical surface on the optical axis I);

[0138] R represents the radius of curvature of the lens surface near the optical axis I;

[0139] K is the conic constant;

[0140] a i is the i-th order aspheric coefficient, wherein the a2 coefficient of each embodiment is 0.

[0141] The material parameters of the lens disclosed in the optical parameter table of the embodiment are in the format of nd refractive index and Vd Abbe number of the International Glass Code, so that those skilled in the art can know the specific material implementation. Among them, nd is the refractive index of the material at the d helium yellow line 587.56 nanometers, and Vd is calculated based on the refractive index of the material at the d, F and C wavelengths of the Fraunhofer spectrum.

[0142] The focal length values ​​disclosed in the optical parameter table of the embodiment are calculated based on the refractive index of the wavelength band implemented by the optical system, and the primary wavelength (primary wavelength) implemented in the embodiment of the present invention is 555 nanometers, so the focal length value of the present invention is calculated based on the refractive index of the material at 555 nanometers.

[0143] First Embodiment The optical data of the optical imaging lens system 1 is as follows: Fig. 22 As shown, the aspheric data is as follows Fig.23 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 = 2.586 mm; HFOV = 47.489 degrees; TTL = 4.280 mm; Fno = 1.900; ImgH = 2.900 mm.

[0144] Second embodiment

[0145] 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 A. For field curvature aberration in the sagittal direction, please refer to Fig. 9 B. For the field curvature aberration in the meridian direction, please refer to Fig. 9 C. For distortion, please refer to Fig. 9 D. 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 23 of the object side surface 21 of the second lens 20 is a concave surface, the circumferential area 34 of the object side surface 31 of the third lens 30 is a concave surface, the optical axis area 36 of the image side surface 32 of the third lens 30 is a concave surface, the fourth lens 40 has a positive refractive power, the circumferential area 54 of the object side surface 51 of the fifth lens 50 is a convex surface, and the circumferential area 57 of the image side surface 52 of the fifth lens 50 is a concave surface.

[0146] The detailed optical data of the second embodiment are as follows Fig.24 As shown, the aspheric data is as follows Fig.25 As shown in the figure, in this embodiment, EFL=2.521 mm; HFOV=47.484 degrees; TTL=4.280 mm; Fno=1.900; ImgH=2.900 mm. In particular, the longitudinal spherical aberration of this embodiment is better than that of the first embodiment.

[0147] Third embodiment

[0148] 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 A. For field curvature aberration in the sagittal direction, please refer to Fig.11 B. For the field curvature aberration in the meridian direction, please refer to Fig.11 C. For distortion, please refer to Fig.11 D. 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 circumferential region 14 of the object side surface 11 of the first lens 10 is convex, the circumferential region 34 of the object side surface 31 of the third lens 30 is concave, the fifth lens 50 has a negative refractive power, the circumferential region 54 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 concave, and the sixth lens 60 has a positive refractive power.

[0149] The detailed optical data of the third embodiment are as follows Fig.26 As shown, the aspheric data is as follows Fig. 27 As shown, in this embodiment, EFL = 2.547 mm; HFOV = 47.508 degrees; TTL = 4.280 mm; Fno = 1.900; ImgH = 2.900 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; 3. The thickness difference between the optical axis and the circumference 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.

[0150] Fourth embodiment

[0151] 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 A. For field curvature aberration in the sagittal direction, please refer to Fig.13 B. For the field curvature aberration in the meridian direction, please refer to Fig.13 C. For 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 second lens 20 has a positive refractive power, the optical axis area 33 of the object side surface 31 of the third lens 30 is a concave surface, the circumferential area 34 of the object side surface 31 of the third lens 30 is a concave surface, the circumferential area 54 of the object side surface 51 of the fifth lens 50 is a convex surface, the circumferential area 57 of the image side surface 52 of the fifth lens 50 is a concave surface, and the sixth lens 60 has a positive refractive power.

[0152] The detailed optical data of the fourth embodiment are as follows Fig.28 As shown, the aspheric data is as follows Fig.29 In this embodiment, EFL = 2.259 mm; HFOV = 47.519 degrees; TTL = 4.276 mm; Fno = 1.900; ImgH = 2.900 mm. In particular, the thickness difference between the optical axis and the circumference of the lens in this embodiment is smaller than that in the first embodiment, and it is easy to manufacture and thus has a higher yield.

[0153] Fifth embodiment

[0154] 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 A. For field curvature aberration in the sagittal direction, please refer to Fig.15 B. For the field curvature aberration in the meridian direction, please refer to Fig.15 C. For distortion, please refer to Fig.15D. 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 first lens 10 has a negative refractive power, the optical axis area 16 of the image side surface 12 of the first lens 10 is a concave surface, and the circumferential area 57 of the image side surface 52 of the fifth lens 50 is a concave surface.

[0155] The detailed optical data of the fifth embodiment are as follows Fig.30 As shown, the aspheric data is as follows Fig.31 As shown. In this embodiment, EFL = 2.701 mm; HFOV = 47.519 degrees; TTL = 4.280 mm; Fno = 1.900; ImgH = 2.900 mm. In particular, the field curvature aberration in the tangential direction of this embodiment is better than the field curvature aberration in the sagittal direction of the first embodiment.

[0156] Sixth embodiment

[0157] 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 A. For field curvature aberration in the sagittal direction, please refer to Fig.17 B. For the field curvature aberration in the meridian direction, please refer to Fig.17 C. For 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 circumferential area 14 of the object side surface 11 of the first lens 10 is a convex surface, the circumferential area 34 of the object side surface 31 of the third lens 30 is a concave surface, and the circumferential area 54 of the object side surface 51 of the fifth lens 50 is a convex surface.

[0158] The detailed optical data of the sixth embodiment are as follows Fig.32 As shown, the aspheric data is as follows Fig.33 As shown. In this embodiment, EFL = 2.574 mm; HFOV = 47.515 degrees; TTL = 4.310 mm; Fno = 1.900; ImgH = 2.900 mm. In particular: 1. The longitudinal spherical aberration of this embodiment is better than that of the first embodiment; 2. The field curvature aberration in the meridian direction of this embodiment is better than that of the first embodiment; 3. The thickness difference between the optical axis and the circumferential area of ​​the lens in this embodiment is smaller than that in the first embodiment, which is easy to manufacture and has a higher yield.

[0159] Seventh embodiment

[0160] 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 A. For field curvature aberration in the sagittal direction, please refer to Fig.19 B. For the field curvature aberration in the meridian direction, please refer to Fig.19 C. For 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 circumferential area 14 of the object side surface 11 of the first lens 10 is a convex surface, and the optical axis area 36 of the image side surface 32 of the third lens 30 is a concave surface.

[0161] The detailed optical data of the seventh embodiment are as follows Fig.34 As shown, the aspheric data is as follows Fig.35 In this embodiment, EFL=2.585 mm; HFOV=47.516 degrees; TTL=4.280 mm; Fno=1.900; ImgH=2.898 mm.

[0162] Eighth embodiment

[0163] See also Fig. 20 , illustrating the eighth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the eighth embodiment on the imaging plane 4, please refer to Fig.21 A. For field curvature aberration in the sagittal direction, please refer to Fig.21 B. For the field curvature aberration in the meridian direction, please refer to Fig.21 C. For distortion, please refer to Fig.21 D. The design of the eighth 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 negative refractive power, the circumferential region 34 of the object side surface 31 of the third lens 30 is a concave surface, the optical axis region 36 of the image side surface 32 of the third lens 30 is a concave surface, the fourth lens 40 has a positive refractive power, the circumferential region 54 of the object side surface 51 of the fifth lens 50 is a convex surface, and the circumferential region 57 of the image side surface 52 of the fifth lens 50 is a concave surface.

[0164] The detailed optical data of the eighth embodiment are as follows Fig.36 As shown, the aspheric data is as follows Fig.37 In this embodiment, EFL=2.608 mm; HFOV=47.491 degrees; TTL=4.280 mm; Fno=1.900; ImgH=2.900 mm.

[0165] In addition, the important parameters of each embodiment are summarized in Fig.38 middle.

[0166] The embodiments of the present invention provide a six-lens optical imaging lens with a small aperture value, small size, excellent imaging quality, good optical performance, and technical feasibility. For example, the design of the lens surface shape or parameters that meet the following requirements can effectively optimize the imaging quality of the optical imaging lens 1 of the present invention, and can achieve corresponding beneficial effects:

[0167] 1. When the circumferential area 17 of the image side surface 12 of the first lens 10 is convex, the circumferential area 27 of the image side surface 22 of the second lens 20 is concave, and the circumferential area 47 of the image side surface 42 of the fourth lens 40 is concave, the optical imaging lens can improve the aberration of the edge of the imaging surface and increase the light flux. The ratio limit of (T5+BFL) / (T1+G12)≥4.390 reflects that the thickness T5 and the back focal length BFL of the fifth lens 50 on the optical axis I account for a greater proportion than the thickness of the first lens 10 on the optical axis I in the front section while controlling the system length and reducing the volume. T1 and the sum of the air gap distance G12 between the first lens 10 and the second lens 20 on the optical axis I. Before the light enters the sixth lens 60, the fifth lens 50 with a larger thickness T5 is used to achieve a uniform light path effect. Before imaging, a larger back focal length BFL is used to effectively increase the imaging space and make the light path before focusing more parallel and uniform, thereby reducing the influence of aberrations and improving the clarity and quality of the image. The preferred implementation range of (T5+BFL) / (T1+G12) is 4.390≦(T5+BFL) / (T1+G12)≦11.000.

[0168] Combined with (1) to (3), the effects are as follows:

[0169] (1) The optical axis region 43 of the object-side surface 41 of the fourth lens 40 is a convex surface, the circumferential region 44 of the object-side surface 41 of the fourth lens 40 is a concave surface, and the optical axis region 53 of the object-side surface 51 of the fifth lens 50 is a concave surface, which can further improve the focusing effect of the entire lens.

[0170] (2) The circumferential region 24 of the object-side surface 21 of the second lens 20 is a convex surface, the optical axis region 43 of the object-side surface 41 of the fourth lens 40 is a convex surface, the optical axis region 63 of the object-side surface 61 of the sixth lens 60 is a convex surface, and the optical axis region 66 of the image-side surface 62 of the sixth lens 60 is a concave surface, which can further improve the focusing effect of the entire lens.

[0171] (3) The circumferential region 37 of the image side surface 32 of the third lens 30 is a convex surface, the circumferential region 44 of the object side surface 41 of the fourth lens 40 is a concave surface, the optical axis region 53 of the object side surface 51 of the fifth lens 50 is a concave surface, and the optical axis region 66 of the image side surface 62 of the sixth lens 60 is a concave surface, which can further improve the aberration at the edge of the imaging surface and enhance the overall focusing effect of the lens.

[0172] 2. In order to shorten the length of the lens system and ensure the imaging quality, while taking into account the difficulty of manufacturing, the air gap distance between lenses is reduced or the thickness of the lenses is appropriately shortened as a means. If the numerical limits of the following conditional formula are met, the embodiments of the present invention can have a better configuration. When the better range is met, the aberration and distortion of the optical imaging lens can be improved. When the better range is met, the spherical aberration can be further improved.

[0173] (T3+T5) / T1≥2.400, the optimal range is 2.400≦(T3+T5) / T1≦7.000;

[0174] (G23+T3+T5) / AAG≥1.500, the optimal range is 1.500≦(G23+T3+T5) / AAG≦6.500;

[0175] (T5+T6) / Tavg≥2.600, the optimal range is 2.600≦(T5+T6) / Tavg≦4.000;

[0176] T3 / (G34+G56)≥3.000, the optimal range is 3.000≦T3 / (G34+G56)≦11.000;

[0177] TTL / (G12+G23+G34+G56)≥12.400, the optimal range is 12.400≦TTL / (G12+G23+G34+G56)≦27.000;

[0178] ALT / (T3+T5+T6)≤1.650, the optimal range is 1.300≦ALT / (T3+T5+T6)≦1.650;

[0179] ALT / AAG ≥ 2.900, the optimal range is 2.900 ≦ ALT / AAG ≦ 10.500;

[0180] ImgH / (T2+G23+T4+G45+T6)≥1.500, the optimal range is 1.500≦ImgH / (T2+G23+T4+G45+T6)≦3.100;

[0181] (Tmax+BFL) / (Tmin+AAG)≥1.600, the optimal range is 1.600≦(Tmax+BFL) / (Tmin+AAG)≦6.000;

[0182] BFL / (G12+G34+G56)≥9.200, the optimal range is 9.200≦BFL / (G12+G34+G56)≦19.000;

[0183] BFL / (G12+G23+G34)≥3.200, the optimal range is 3.200≦BFL / (G12+G23+G34)≦12.500;

[0184] (T3+G34+T4+G45+T5) / (T1+G12+T2)≥2.100, the optimal range is 2.100≦(T3+G34+T4+G45+T5) / (T1+G12+T2)≦4.200;

[0185] (T5+T6+BFL) / (T1+G12+T2+G23)≥2.700, the optimal range is 2.700≦(T5+T6+BFL) / (T1+G12+T2+G23)≦5.600;

[0186] ALT / (G23+T3+BFL)≤1.500, the optimal range is 1.100≦ALT / (G23+T3+BFL)≦1.500;

[0187] AAG / T5≤1.700, the preferred range is 0.200≦AAG / T5≦1.700.

[0188] 3. When the length of the lens system is shortened, the effective focal length of the system is adjusted by matching the back focal length and the thickness of each lens to ensure the imaging quality at a larger field of view. If the numerical limits of the following conditional formula are met, the embodiments of the present invention can have a better configuration. When the better range is met, the aberration and distortion of the optical imaging lens can be improved. When the better range is met, the spherical aberration can be further improved.

[0189] EFL*Fno / Tavg≤14.000, the optimal range is 10.000≦EFL*Fno / Tavg≦14.000;

[0190] EFL / BFL≤2.500, the optimal range is 1.750≦EFL / BFL≦2.500;

[0191] EFL / (BFL+T5)≤1.600, the optimal range is 0.900≦EFL / (BFL+T5)≦1.600;

[0192] (EFL+TL) / (T2+G23+T4+G45+T6+BFL)≤2.300, and the preferred range is 1.750≦(EFL+TL) / (T2+G23+T4+G45+T6+BFL)≦2.300.

[0193] 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.

[0194] 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 system of the present invention, reduce the aperture value, 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.

[0195] 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.

[0196] 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:

[0197] (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.

[0198] (2) The comparative relationship between optical parameters, for example: A is greater than B or A is less than B.

[0199] (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 of multiple embodiments of the present invention, and γ2 is the minimum value of multiple embodiments of the present invention.

[0200] 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.

[0201] 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.

[0202] 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, characterized in that: The optical system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens in sequence from an object side to an image side along an optical axis, and each of the first lens to the sixth lens includes an object-side surface facing the object side and allowing imaging light to pass therethrough, and an image-side surface facing the image side and allowing the imaging light to pass therethrough; A circumferential area of ​​the image-side surface of the first lens is a convex surface; A circumferential area of ​​the image-side surface of the second 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 concave surface; and An optical axis region of the object-side surface of the fifth lens is a concave surface; The optical imaging lens has only the above six lenses, T5 is defined as the thickness of the fifth lens on the optical axis, BFL is defined as the distance from the image side surface of the sixth lens to an imaging surface on the optical axis, T1 is defined as the thickness of the first lens on the optical axis, G12 is defined as the air gap distance between the first lens and the second lens on the optical axis, and (T5+BFL) / (T1+G12)≥4.390 is satisfied.

2. An optical imaging lens, characterized in that: The optical system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens in sequence from an object side to an image side along an optical axis, and each of the first lens to the sixth lens includes an object-side surface facing the object side and allowing imaging light to pass therethrough, and an image-side surface facing the image side and allowing the imaging light to pass therethrough; A circumferential area of ​​the image-side surface of the first lens is a convex surface; A circumferential area of ​​the object-side surface of the second lens is a convex surface, and a circumferential area of ​​the image-side surface of the second lens is a concave surface; An optical axis region of the object-side surface of the fourth lens is a convex surface, and a circumferential region of the image-side surface of the fourth lens is a concave surface; and An optical axis region of the object-side surface of the sixth lens is a convex surface, and an optical axis region of the image-side surface of the sixth lens is a concave surface; The optical imaging lens has only the above six lenses, T5 is defined as the thickness of the fifth lens on the optical axis, BFL is defined as the distance from the image side surface of the sixth lens to an imaging surface on the optical axis, T1 is defined as the thickness of the first lens on the optical axis, G12 is defined as the air gap distance between the first lens and the second lens on the optical axis, and (T5+BFL) / (T1+G12)≥4.390 is satisfied.

3. An optical imaging lens, characterized in that: The optical system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens in sequence from an object side to an image side along an optical axis, and each of the first lens to the sixth lens includes an object-side surface facing the object side and allowing imaging light to pass therethrough, and an image-side surface facing the image side and allowing the imaging light to pass therethrough; A circumferential area of ​​the image-side surface of the first lens is a convex surface; A circumferential area of ​​the image-side surface of the second lens is a concave surface; A circumferential area of ​​the image-side surface of the third lens is a convex surface; A circumferential area of ​​the object-side surface of the fourth lens is a concave surface, and a circumferential area of ​​the image-side surface of the fourth lens is a concave 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 sixth lens is a concave surface; The optical imaging lens has only the above six lenses, T5 is defined as the thickness of the fifth lens on the optical axis, BFL is defined as the distance from the image side surface of the sixth lens to an imaging surface on the optical axis, T1 is defined as the thickness of the first lens on the optical axis, G12 is defined as the air gap distance between the first lens and the second lens on the optical axis, and (T5+BFL) / (T1+G12)≥4.390 is satisfied.

4. The optical imaging lens according to claim 1, 2 or 3, wherein: T3 is defined as the thickness of the third lens on the optical axis, and the optical imaging lens satisfies the following condition: (T3+T5) / T1≥2.

400.

5. The optical imaging lens according to claim 1, 2 or 3, wherein: G23 is defined as the air gap distance between the second lens and the third lens on the optical axis, T3 is defined as the thickness of the third lens on the optical axis, AAG is defined as the sum of five air gap distances from the first lens to the sixth lens on the optical axis, and the optical imaging lens satisfies the following condition: (G23+T3+T5) / AAG≥1.

500.

6. The optical imaging lens according to claim 1, 2 or 3, wherein: T6 is defined as the thickness of the sixth lens on the optical axis, Tavg is defined as the average thickness of six lenses from the first lens to the sixth lens on the optical axis, and the optical imaging lens satisfies the following condition: (T5+T6) / Tavg≥2.

600.

7. The optical imaging lens according to claim 1, 2 or 3, wherein: EFL is defined as the effective focal length of the optical imaging lens, Fno is defined as the aperture value of the optical imaging lens, Tavg is defined as the average value of the thickness of six lenses from the first lens to the sixth lens on the optical axis, and the optical imaging lens satisfies the following condition: EFL*Fno / Tavg≤14.

000.

8. The optical imaging lens according to claim 1, 2 or 3, wherein: T3 is defined as the thickness of the third lens on the optical axis, G34 is defined as the air gap distance between the third lens and the fourth lens on the optical axis, G56 is defined as the air gap distance between the fifth lens and the sixth lens on the optical axis, and the optical imaging lens satisfies the following condition: T3 / (G34+G56)≥3.

000.

9. The optical imaging lens according to claim 1, 2 or 3, wherein: TTL is defined as the distance from the object side surface of the first lens to the imaging surface on the optical axis, G23 is defined as the air gap distance between the second lens and the third lens on the optical axis, G34 is defined as the air gap distance between the third lens and the fourth lens on the optical axis, G56 is defined as the air gap distance between the fifth lens and the sixth lens on the optical axis, and the optical imaging lens satisfies the following condition: TTL / (G12+G23+G34+G56)≥12.

400.

10. The optical imaging lens according to claim 1, 2 or 3, wherein: ALT is defined as the sum of thicknesses of six lenses from the first lens to the sixth lens on the optical axis, T3 is defined as the thickness of the third lens on the optical axis, T6 is defined as the thickness of the sixth lens on the optical axis, and the optical imaging lens satisfies the following condition: ALT / (T3+T5+T6)≤1.

650.

11. The optical imaging lens according to claim 1, 2 or 3, wherein: EFL is defined as the effective focal length of the optical imaging lens, and the optical imaging lens meets the following condition: EFL / BFL≤2.

500.

12. The optical imaging lens according to claim 1, 2 or 3, wherein: ALT is defined as the sum of thicknesses of six lenses from the first lens to the sixth lens on the optical axis, AAG is defined as the sum of five air gap distances from the first lens to the sixth lens on the optical axis, and the optical imaging lens satisfies the following condition: ALT / AAG≥2.

900.

13. The optical imaging lens according to claim 1, 2 or 3, wherein: ImgH is defined as the image height of the optical imaging lens, T2 is defined as the thickness of the second lens on the optical axis, G23 is defined as the air gap distance between the second lens and the third lens on the optical axis, T4 is defined as the thickness of the fourth lens on the optical axis, G45 is defined as the air gap distance between the fourth lens and the fifth lens on the optical axis, T6 is defined as the thickness of the sixth lens on the optical axis, and the optical imaging lens satisfies the following condition: ImgH / (T2+G23+T4+G45+T6)≥1.

500.

14. The optical imaging lens according to claim 1, 2 or 3, wherein: G34 is defined as the air gap distance between the third lens and the fourth lens on the optical axis, G56 is defined as the air gap distance between the fifth lens and the sixth lens on the optical axis, and the optical imaging lens satisfies the following condition: BFL / (G12+G34+G56)≥9.

200.

15. The optical imaging lens according to claim 1, 2 or 3, wherein: EFL is defined as the effective focal length of the optical imaging lens, TL is defined as the distance from the object side surface of the first lens to the image side surface of the sixth lens on the optical axis, T2 is defined as the thickness of the second lens on the optical axis, G23 is defined as the air gap distance between the second lens and the third lens on the optical axis, T4 is defined as the thickness of the fourth lens on the optical axis, G45 is defined as the air gap distance between the fourth lens and the fifth lens on the optical axis, T6 is defined as the thickness of the sixth lens on the optical axis, and the optical imaging lens satisfies the following condition: (EFL+TL) / (T2+G23+T4+G45+T6+BFL)≤2.

300.

16. The optical imaging lens according to claim 1, 2 or 3, wherein: Tmax is defined as the maximum value of the six lens thicknesses from the first lens to the sixth lens on the optical axis, Tmin is defined as the minimum value of the six lens thicknesses from the first lens to the sixth lens on the optical axis, AAG is defined as the sum of the five air gap distances from the first lens to the sixth lens on the optical axis, and the optical imaging lens satisfies the following condition: (Tmax+BFL) / (Tmin+AAG)≥1.

600.

17. The optical imaging lens according to claim 1, 2 or 3, wherein: EFL is defined as the effective focal length of the optical imaging lens, and the optical imaging lens satisfies the following condition: EFL / (BFL+T5)≤1.

600.

18. The optical imaging lens according to claim 1, 2 or 3, wherein: G23 is defined as the air gap distance between the second lens and the third lens on the optical axis, G34 is defined as the air gap distance between the third lens and the fourth lens on the optical axis, and the optical imaging lens satisfies the following condition: BFL / (G12+G23+G34)≥3.

200.

19. The optical imaging lens according to claim 1, 2 or 3, wherein: T3 is defined as the thickness of the third lens on the optical axis, G34 is defined as the air gap distance between the third lens and the fourth lens on the optical axis, T4 is defined as the thickness of the fourth lens on the optical axis, G45 is defined as the air gap distance between the fourth lens and the fifth lens on the optical axis, T2 is defined as the thickness of the second lens on the optical axis, and the optical imaging lens satisfies the following condition: (T3+G34+T4+G45+T5) / (T1+G12+T2)≥2.

100.

20. The optical imaging lens according to claim 1, 2 or 3, wherein: T6 is defined as the thickness of the sixth lens on the optical axis, T2 is defined as the thickness of the second lens on the optical axis, G23 is defined as the air gap distance between the second lens and the third lens on the optical axis, and the optical imaging lens satisfies the following conditions: (T5+T6+BFL) / (T1+G12+T2+G23)≥2.700.

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