Optical imaging lens

Abstract

The invention provides an optical imaging lens which comprises a first lens to a sixth lens. The optical axis area of the object side surface of the first lens is a convex surface, the optical axis area of the object 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 concave surface and the circumferential area of the image side surface of the fourth lens is a concave surface, and the circumferential 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. And the optical axis region of the object side surface of the sixth lens is a convex surface. Only the six lenses of the optical imaging lens meet the requirement that HFOV * Fno / D31t41 is larger than or equal to 80.000 degrees / mm, and the lens with the thickest thickness on the optical axis in the six lenses is the fifth lens or the sixth lens.

Description

Technical Field

[0001] This invention relates to an optical imaging lens. Specifically, this invention is particularly directed to an optical imaging lens primarily used for capturing images and videos, and applied in portable electronic products, such as mobile phones, cameras, tablet computers, personal digital assistants (PDAs), or head-mounted displays (AR, VR, MR). Background Technology

[0002] In recent years, optical imaging lenses have continued to evolve, with applications expanding beyond just image and video capture to include environmental monitoring, dashcam photography, virtual reality trackers (VR trackers), and facial recognition. In addition to requiring lenses to be lightweight and compact, a wide field of view is also becoming increasingly important. Therefore, designing an optical imaging lens that combines lightweight design, a wide field of view, and excellent image quality has become a challenge and a problem that needs to be solved. Summary of the Invention

[0003] Therefore, various embodiments of the present invention propose a six-element optical imaging lens that is lightweight, compact, has a large field of view, excellent image quality, and is technically feasible. The six-element optical imaging lens of the present invention comprises, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis. Each of the first, second, third, fourth, fifth, and sixth lenses has 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 optical axis region of the object-side surface of the first lens is convex, the optical axis region of the object-side surface of the second lens is concave, the optical axis region of the object-side surface of the fourth lens is concave and the circumferential region of the image-side surface of the fourth lens is concave, the circumferential region of the object-side surface of the fifth lens is convex and the circumferential region of the image-side surface of the fifth lens is convex, and the optical axis region of the object-side surface of the sixth lens is convex. This optical imaging lens has only the above six lenses, and satisfies HFOV*Fno / D31t41≧80.000 degrees / mm. Among the above six lenses, the thickest on the optical axis is either the fifth or sixth lens.

[0005] In another embodiment of the present invention, the optical axis region of the object-side surface of the second lens is concave, the circumferential region of the object-side surface of the third lens is convex, the optical axis region of the object-side surface of the fourth lens is concave and the circumferential region of the image-side surface of the fourth lens is concave, the circumferential region of the object-side surface of the fifth lens is convex and the circumferential region of the image-side surface of the fifth lens is convex, and the optical axis region of the object-side surface of the sixth lens is convex. This optical imaging lens has only the above six lenses, and satisfies HFOV*Fno / D31t41≧80.000 degrees / mm. Among the above six lenses, the thickest on the optical axis is either the fifth or sixth lens.

[0006] In another embodiment of the present invention, the optical axis region of the object-side surface of the second lens is concave, the optical axis region of the object-side surface of the fourth lens is concave and the circumferential region of the image-side surface of the fourth lens is concave, the circumferential region of the object-side surface of the fifth lens is convex and the circumferential region of the image-side surface of the fifth lens is convex, and the optical axis region of the object-side surface of the sixth lens is convex. This optical imaging lens has only the above six lenses, and satisfies HFOV*Fno / D31t41≧80.000 degrees / mm and (ImgH+T2) / Gmin≦110.000. Among the above six lenses, the thickest on the optical axis is either the fifth or sixth lens.

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

[0008] EFL / (Gmin+T4)≧5.500;

[0009] ImgH / Gavg ≤ 8.000;

[0010] TL / (T2+T3)≦5.000;

[0011] (υ2+υ3+υ4) / υ6≦2.000;

[0012] (υ5+υ6) / υ1≧1.900;

[0013] HFOV / ALT ≥ 13,000 degrees / mm;

[0014] Fno*Tmax / Tavg≦3.800;

[0015] D11t22 / D42t61≦2.000;

[0016] TTL / D12t31≧2.900;

[0017] (BFL+G12) / D32t42≧2.000;

[0018] (EFL+D42t52) / D22t32≧2.800;

[0019] Fno*TL / D11t21≦8.000;

[0020] HFOV*(Tmax+G45)≦75.000 degrees·mm;

[0021] (AAG+T3+T6) / Gavg≦9.000;

[0022] (ALT+D41t51) / D11t21≦3.000;

[0023] AAG / Tmin ≥ 5.000;

[0024] (BFL+EFL) / D12t22≦3.000.

[0025] Where T2 is the thickness of the second lens on the optical axis; T3 is the thickness of the third lens on the optical axis; T4 is the thickness of the fourth lens on the optical axis; and T6 is the thickness of the sixth lens on the optical axis. Tmax is the maximum value of the six thicknesses of the first to sixth lenses on the optical axis. Tmin is the minimum value of the six thicknesses of the first to sixth lenses on the optical axis. Tavg is the average value of the six thicknesses of the first to sixth lenses on the optical axis.

[0026] G12 is the air gap between the first and second lenses on the optical axis; G45 is the air gap between the fourth and fifth lenses on the optical axis; Gmin is the minimum value of the five air gaps between the first to sixth lenses on the optical axis; Gavg is the average value of the five air gaps between the first to sixth lenses on the optical axis.

[0027] Fno is the aperture value of the optical imaging lens; AAG is the sum of the five air gaps on the optical axis from the first lens to the sixth lens; ImgH is the image height of the optical imaging lens; TL is the distance on the optical axis from the object side of the first lens to the image side of the sixth lens; ALT is the sum of the thicknesses of the six lenses on the optical axis from the first lens to the sixth lens; TTL is the distance on the optical axis from the object side of the first lens to the image plane; BFL is the distance on the optical axis from the image side of the sixth lens to the image plane; HFOV is the half angle of view of the optical imaging lens; EFL is the effective focal length of the optical imaging lens.

[0028] D31t41 is defined as the distance on the optical axis from the object-side surface of the third lens to the object-side surface of the fourth lens; D11t22 is defined as the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the second lens; D42t61 is defined as the distance on the optical axis from the image-side surface of the fourth lens to the object-side surface of the sixth lens; D12t31 is defined as the distance on the optical axis from the image-side surface of the first lens to the object-side surface of the third lens; D32t42 is defined as the distance on the optical axis from the image-side surface of the third lens to the image-side surface of the fourth lens; D42t52 is defined as the distance on the optical axis from the image-side surface of the fourth lens to the image-side surface of the fifth lens; D22t32 is defined as the distance on the optical axis from the image-side surface of the second lens to the image-side surface of the third lens; D11t21 is defined as the distance on the optical axis from the object-side surface of the first lens to the object-side surface of the second lens; D41t51 is defined as the distance on the optical axis from the object-side surface of the fourth lens to the object-side surface of the fifth lens; D12t22 is defined as the distance on the optical axis from the image-side surface of the first lens to the image-side surface of the second lens. Attached Figure Description

[0029] Figure 1 A schematic diagram illustrating the method for determining the curvature shape of the optical imaging lens of the present invention. Figure 1 ;

[0030] Figure 2 A schematic diagram illustrating the method for determining the curvature shape of the optical imaging lens of the present invention. Figure 2 ;

[0031] Figure 3 A schematic diagram illustrating the method for determining the curvature shape of the optical imaging lens of the present invention. Figure 3 ;

[0032] Figure 4 A schematic diagram illustrating the method for determining the curvature shape of the optical imaging lens of the present invention. Figure 4 ;

[0033] Figure 5 A schematic diagram illustrating the method for determining the curvature shape of the optical imaging lens of the present invention. Figure 5 ;

[0034] Figure 6 A schematic diagram illustrating a first embodiment of the optical imaging lens of the present invention;

[0035] Figure 7 A diagram illustrating the parameters of the first embodiment of the optical lens of the present invention is provided; wherein, A represents longitudinal spherical aberration on the imaging plane; B represents field curvature aberration in the sagittal direction; C represents field curvature aberration in the meridional direction; and D represents distortion aberration.

[0036] Figure 8 A schematic diagram illustrating a second embodiment of the optical imaging lens of the present invention;

[0037] Figure 9A diagram illustrating the parameters of a second embodiment of the optical lens of the present invention is provided; wherein, A represents longitudinal spherical aberration on the imaging plane; B represents field curvature aberration in the sagittal direction; C represents field curvature aberration in the meridional direction; and D represents distortion aberration.

[0038] Figure 10 A schematic diagram illustrating a third embodiment of the optical imaging lens of the present invention;

[0039] Figure 11 The diagram illustrates the parameters of the third embodiment of the optical lens of the present invention; 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 meridional direction; and D is the distortion aberration.

[0040] Figure 12 A schematic diagram illustrating a fourth embodiment of the optical imaging lens of the present invention;

[0041] Figure 13 The diagram illustrates the parameters of the fourth embodiment of the optical lens of the present invention; 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 meridional direction; and D is the distortion aberration.

[0042] Figure 14 A schematic diagram illustrating a fifth embodiment of the optical imaging lens of the present invention;

[0043] Figure 15 A diagram illustrating the parameters of a fifth embodiment of the optical lens of the present invention is provided; wherein, A represents longitudinal spherical aberration on the imaging plane; B represents field curvature aberration in the sagittal direction; C represents field curvature aberration in the meridional direction; and D represents distortion aberration.

[0044] Figure 16 A schematic diagram illustrating a sixth embodiment of the optical imaging lens of the present invention;

[0045] Figure 17 A diagram illustrating the parameters of a sixth embodiment of the optical lens of the present invention is provided; wherein, A represents longitudinal spherical aberration on the imaging plane; B represents field curvature aberration in the sagittal direction; C represents field curvature aberration in the meridional direction; and D represents distortion aberration.

[0046] Figure 18 A schematic diagram illustrating a seventh embodiment of the optical imaging lens of the present invention;

[0047] Figure 19 A diagram illustrating the parameters of a seventh embodiment of the optical lens of the present invention is provided; wherein, A represents longitudinal spherical aberration on the imaging plane; B represents field curvature aberration in the sagittal direction; C represents field curvature aberration in the meridional direction; and D represents distortion aberration.

[0048] Figure 20 This shows detailed optical data for the first embodiment;

[0049] Figure 21 This shows detailed aspherical data for the first embodiment;

[0050] Figure 22 This shows detailed optical data for the second embodiment;

[0051] Figure 23 This indicates detailed aspherical data for the second embodiment;

[0052] Figure 24 This describes the detailed optical data of the third embodiment;

[0053] Figure 25 This describes the detailed aspherical data of the third embodiment;

[0054] Figure 26 This shows the detailed optical data for the fourth embodiment;

[0055] Figure 27 This shows the detailed aspherical data of the fourth embodiment;

[0056] Figure 28 This shows detailed optical data for the fifth embodiment;

[0057] Figure 29 This shows the detailed aspherical data of the fifth embodiment;

[0058] Figure 30 This shows the detailed optical data for the sixth embodiment;

[0059] Figure 31 This shows the detailed aspherical data of the sixth embodiment;

[0060] Figure 32 This shows the detailed optical data for the seventh embodiment;

[0061] Figure 33 This shows the detailed aspherical data of the seventh embodiment;

[0062] Figure 34 One of the key parameters for each embodiment;

[0063] Figure 35 This indicates two important parameters for each embodiment;

[0064] Figure 36 The third important parameter for each embodiment is shown.

[0065] Figure label:

[0066] 1: Optical imaging lens; 2: Aperture; 3: Filter; 4: Imaging plane;

[0067] 11, 21, 31, 41, 51, 61, 110, 410, 510: Side view of the object;

[0068] 12, 22, 32, 42, 52, 62, 120, 320: like a side view;

[0069] 13, 16, 23, 26, 33, 36, 43, 46, 53, 56, 63, 66, Z1: Optical axis region;

[0070] 14, 17, 24, 27, 34, 37, 44, 47, 54, 57, 64, 67, Z2: Circular region;

[0071] 10: First lens; 20: Second lens; 30: Third lens; 40: Fourth lens;

[0072] 50: Fifth lens; 60: Sixth lens; 100, 200, 300, 400, 500: Lenses;

[0073] 130: Assembly section; 211, 212: Parallel rays; A1: Object side; A2: Image side;

[0074] CP: Center point; CP1: First center point; CP2: Second center point; TP1: First transition point;

[0075] TP2: Second conversion point; OB: Optical boundary; I: Optical axis; Lc: Principal ray;

[0076] Lm: Edge ray; EL: Extension line; Z3: Relay area; M: Intersection point; R: Intersection point. Detailed Implementation

[0077] 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.

[0078] The optical system described in this specification includes at least one lens that receives imaging rays incident on the optical system from parallel to the optical axis to within a half-angle (HFOV) relative to the optical axis. The imaging rays pass through the optical system and form an image on the imaging plane. The statement "a lens has a positive (or negative) refractive index" means that the paraxial refractive index of the lens, calculated using Gaussian optics theory, is positive (or negative). The statement "the object side (or image side) of the lens" is defined as the specific range through which the imaging rays pass on the lens surface. The imaging rays include at least two types of rays: the chief ray (Lc) and the marginal ray (Lm) (e.g., ...). Figure 1 (As shown). The object side (or image side) of the lens can be divided into different regions depending on the location, including the optical axis region, the circumferential region, or one or more relay regions in some embodiments, which will be described in detail below.

[0079] Figure 1 This is a radial sectional view of lens 100. Two reference points are defined on the surface of lens 100: a center point and a transition point. The center point of the lens surface is the intersection of this surface and the optical axis I. For example... Figure 1 As illustrated, the first center point CP1 is located on the object-side surface 110 of lens 100, and the second center point CP2 is located on the image-side surface 120 of lens 100. A transition point is a point on the lens surface whose tangent is perpendicular to the optical axis I. The optical boundary OB of the lens surface is defined as the point where the outermost radially outermost edge ray Lm passing through the lens surface intersects the lens surface. All transition points are located between the optical axis I and the optical boundary OB of the lens surface. In addition, the surface of lens 100 may have no transition points or at least one transition point. If a single lens surface has multiple transition points, these transition points are named sequentially from the first transition point in the radially outward direction. For example, the first transition point TP1 (closest to the optical axis I), the second transition point TP2 (as shown in the example), and the third transition point TP2 (as shown in the example) are named sequentially from the first transition point in the radially outward direction. Figure 4 (as shown) and the Nth conversion point (farthest from optical axis I).

[0080] When the lens surface has at least one transition point, the region from the center point to the first transition point TP1 is defined as the optical axis region, which includes the center point. The region radially outward from the transition point farthest from optical axis I (the Nth transition point) to the optical boundary OB is defined as the circumferential region. In some embodiments, a relay region may be included between the optical axis region and the circumferential region; the number of relay regions depends on the number of transition points. When the lens surface does not have a transition point, 0% to 50% of the distance from optical axis I to the optical boundary OB of the lens surface is defined as the optical axis region, and 50% to 100% of the distance from optical axis I to the optical boundary OB of the lens surface is defined as the circumferential region.

[0081] When a ray parallel to optical axis I passes through a region, if the ray bends towards optical axis I and the intersection point with optical axis I is located on the image side A2 of the lens, then that region is a convex surface. When a ray parallel to optical axis I passes through a region, if the extension of the ray intersects optical axis I at the object side A1 of the lens, then that region is a concave surface.

[0082] In addition, see Figure 1 The lens 100 may also 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) in an optical system. Imaging rays do not reach the assembly portion 130. The structure and shape of the assembly portion 130 are merely illustrative examples of the invention and are not intended to limit the scope of the invention. The assembly portion 130 of the lens discussed below may be partially or entirely omitted in the drawings.

[0083] See Figure 2Define the region between the center point CP and the first conversion point TP1 as the optical axis region Z1. Define the region between the first conversion point TP1 and the optical boundary OB of the lens surface as the circumferential region Z2. For example... Figure 2 As shown, parallel ray 211 intersects optical axis I at the image side A2 of lens 200 after passing through optical axis region Z1. That is, the focal point of parallel ray 211 passing through optical axis region Z1 is located at point R on the image side A2 of lens 200. Since the ray intersects optical axis I at the image side A2 of lens 200, optical axis region Z1 is convex. Conversely, parallel ray 212 diverges after passing through circular region Z2. Figure 2 As shown, the extension EL of parallel ray 212 after passing through the circular region Z2 intersects the optical axis I at the object side A1 of the lens 200. That is, the focal point of parallel ray 212 after passing through the circular region Z2 is located at point M on the object side A1 of the lens 200. Since the extension EL of the ray intersects the optical axis I at the object side A1 of the lens 200, the circular region Z2 is concave. Figure 2 In the lens 200 shown, the first conversion point TP1 is the boundary between the optical axis region and the circumferential region, that is, the first conversion point TP1 is the boundary point between the convex surface and the concave surface.

[0084] On the other hand, the convexity / concavity of the optical axis region can also be determined using the method commonly used by those knowledgeable in the field: judging the convexity / concavity of the lens's optical axis region by the sign of the paraxial radius of curvature (R-value). The R-value is commonly used in optical design software, such as Zemax or CodeV. It is also frequently found in lens data sheets within optical design software. For the object-side, a positive R-value indicates a convex optical axis region, while a negative R-value indicates a concave optical axis region. Conversely, for the image-side, a positive R-value indicates a concave optical axis region, while a negative R-value indicates a convex optical axis region. This method yields results consistent with the aforementioned method using the intersection of a ray / ray extension with the optical axis, where the focal point of a ray parallel to the optical axis is located on either the object-side or image-side of the lens to determine the convexity / concavity. The terms "a region is convex (or concave)," "a region is convex (or concave)," or "a convex (or concave) region" used in this specification may be used interchangeably.

[0085] Figures 3 to 5 Examples of determining the surface shape and boundaries of the lens region in various situations are provided, including the aforementioned optical axis region, circumferential region, and relay region.

[0086] Figure 3 This is a radial sectional view of lens 300. See also... Figure 3The image-side surface 320 of lens 300 has only one transition point TP1 within the optical boundary OB. The optical axis region Z1 and circumferential region Z2 of the image-side surface 320 of lens 300 are as follows... Figure 3 As shown. The R value of the side surface 320 of this image is positive (i.e., R>0), therefore, the optical axis region Z1 is concave.

[0087] Generally, the surface shape of each region bounded by a transition point will be opposite to that of its adjacent regions. Therefore, the transition point can be used to define the change in surface shape, i.e., from the transition point, a surface changes from concave to convex or from convex to concave. Figure 3 In the middle, since the optical axis region Z1 is concave and its shape changes at the transition point TP1, the circumferential region Z2 is convex.

[0088] Figure 4 This is a radial sectional view of lens 400. See also... Figure 4 The object-side surface 410 of lens 400 has a first conversion point TP1 and a second conversion point TP2. The area between the optical axis I and the first conversion point TP1 is defined as the optical axis region Z1 of the object-side surface 410. The R value of this object-side surface 410 is positive (i.e., R>0), therefore, the optical axis region Z1 is a convex surface.

[0089] The area between the second conversion point TP2 and the optical boundary OB of the object-side surface 410 of the lens 400 is defined as a circumferential region Z2, which is also a convex surface. Furthermore, the area between the first conversion point TP1 and the second conversion point TP2 is defined as a relay region Z3, which is also a concave surface. See again. Figure 4 The object-side surface 410, radially outward from the optical axis I, sequentially includes the optical axis region Z1 between the optical axis I and the first conversion point TP1, the relay region Z3 located between the first conversion point TP1 and the second conversion point TP2, and the 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 convex, and its surface shape changes to concave from the first conversion point TP1, the relay region Z3 is concave. Furthermore, its surface shape changes to convex again from the second conversion point TP2, so the circumferential region Z2 is convex.

[0090] Figure 5 This is a radial sectional view of lens 500. The object-side surface 510 of lens 500 has no transition point. For a lens surface without a transition point, such as the object-side surface 510 of lens 500, the optical axis region is defined as 0% to 50% of the distance from the optical axis I to the optical boundary OB of the lens surface, and the circumferential region is defined as 50% to 100% of the distance from the optical axis I to the optical boundary OB of the lens surface. See also Figure 5The lens 500 shown 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 this object-side surface 510 is positive (i.e., R > 0), therefore, the optical axis region Z1 is convex. 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 convex. The lens 500 may further have an assembly portion (not shown) extending radially outward from the circumferential region Z2.

[0091] like Figure 6 As shown, the optical imaging lens 1 of the present invention, from the object side A1 where the object (not shown) is placed to the image side A2 where the image is formed, along the optical axis I, is mainly composed of six lenses, sequentially including 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. Generally, 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 material, but the present invention is not limited to this. The optical imaging lens 1 of the present invention contains only six lenses: 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.

[0092] Furthermore, this optical imaging lens 1 also includes an aperture stop 2, which is set in an appropriate position. Figure 6 In this invention, aperture 2 is positioned on the side of the third lens 30 facing the object side A1, that is, between the second lens 20 and the third lens 30. When light emitted from the object to be photographed (not shown) located on the object side A1 enters the optical imaging lens 1 of this invention, it sequentially passes through the first lens 10, the second lens 20, aperture 2, the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens 60, and the filter 3, and is then focused on the imaging surface 4 on the image side A2 to form a clear image. In various embodiments of this invention, the filter 3 is positioned between the sixth lens 60 and the imaging surface 4. It can be a filter with various suitable functions, such as an infrared cut-off filter, which is used to prevent infrared rays in the imaging light from being transmitted to the imaging surface 4 and affecting the image quality.

[0093] Each lens in the optical imaging lens 1 of the present invention has an object-side surface facing the object side A1 and through which imaging light passes, and an image-side surface facing the image side A2 and through which imaging light passes. Furthermore, 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 also has an optical axis region and a circumferential region.

[0094] Each lens in the optical imaging lens 1 of the present invention also has a thickness T located on the optical axis I. For example, the first lens 10 has a first thickness T1, the second lens 20 has a second thickness T2, the third lens 30 has a third thickness T3, the fourth lens 40 has a fourth thickness T4, the fifth lens 50 has a fifth thickness T5, and the sixth lens 60 has a sixth thickness T6. ALT is the sum of the six 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 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 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 thicknesses of the first lens 10 to the sixth lens 60 on the optical axis I, namely the minimum value among T1, T2, T3, T4, T5, and T6.

[0095] Furthermore, in the optical imaging lens 1 of this invention, each lens has an air gap located on the optical axis I. For example, the air gap between the first lens 10 and the second lens 20 is called G12, the air gap between the second lens 20 and the third lens 30 is called G23, the air gap between the third lens 30 and the fourth lens 40 is called G34, the air gap between the fourth lens 40 and the fifth lens 50 is called G45, and the air gap between the fifth lens 50 and the sixth lens 60 is called G56. Therefore, the sum of the five air gaps 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. Gavg is the average value of the five air gaps on the optical axis I from the first lens 10 to the sixth lens 60, that is, the average value of G12, G23, G34, G45, and G56. Gmax is the maximum value of the five air gaps on optical axis I between the first lens 10 and the sixth lens 60, namely the maximum value among G12, G23, G34, G45, and G56. Gmin is the minimum value of the five air gaps on optical axis I between the first lens 10 and the sixth lens 60, namely the minimum value among G12, G23, G34, G45, and G56.

[0096] D31t41 is defined as the distance on optical axis I between the object-side surface 31 of the third lens 30 and the object-side surface 41 of the fourth lens 40; D11t22 is defined as the distance on optical axis I between the object-side surface 11 of the first lens 10 and the image-side surface 22 of the second lens 20; D42t61 is defined as the distance on optical axis I between the image-side surface 42 of the fourth lens 40 and the object-side surface 61 of the sixth lens 60; D12t31 is defined as the distance on optical axis I between the image-side surface 12 of the first lens 10 and the object-side surface 31 of the third lens 30; D32t42 is defined as the distance on optical axis I between the image-side surface 32 of the third lens 30 and the image-side surface 42 of the fourth lens 40. D42t52 is defined as the distance on optical axis I between the image-side surface 42 of the fourth lens 40 and the image-side surface 52 of the fifth lens 50; D22t32 is defined as the distance on optical axis I between the image-side surface 22 of the second lens 20 and the image-side surface 32 of the third lens 30; D11t21 is defined as the distance on optical axis I between the object-side surface 11 of the first lens 10 and the object-side surface 21 of the second lens 20; D41t51 is defined as the distance on optical axis I between the object-side surface 41 of the fourth lens 40 and the object-side surface 51 of the fifth lens 50; and D12t22 is defined as the distance on optical axis I between the image-side surface 12 of the first lens 10 and the image-side surface 22 of the second lens 20.

[0097] The distance on optical axis I from the object-side surface 11 of the first lens 10 to the image-side surface 4 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 on optical axis I from the object-side surface 11 of the first lens 10 to the image-side surface 62 of the sixth lens 60 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-field of view of the optical imaging lens 1, that is, half of the maximum field of view.

[0098] When filter 3 is positioned between the sixth lens 60 and the imaging surface 4, G6F represents the air gap between the sixth lens 60 and filter 3 on the optical axis I, TF represents the thickness of filter 3 on the optical axis I, GFP represents the air gap between filter 3 and imaging surface 4 on the optical axis I, and BFL is the back focal length of the optical imaging lens 1, which is the distance between the image side 62 of the sixth lens 60 and the imaging surface 4 on the optical axis I, i.e., BFL = G6F + TF + GFP.

[0099] Furthermore, the following are defined: 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.

[0100] First Embodiment

[0101] Please see Figure 6 This example illustrates a first embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 4 in the first embodiment, please refer to... Figure 7 For the field curvature aberrations in part A and the sagittal direction, please refer to [reference needed]. Figure 7 For part B and the field curvature aberration in the tangential direction, please refer to [reference needed]. Figure 7 For Part C and distortion aberration, please refer to [reference needed]. Figure 7Part D. In all embodiments, the Y-axis of each spherical aberration map represents the field of view, and its highest point is 1.0. In each embodiment, the Y-axis of each aberration map and distortion aberration map represents the image height. The image height of the first embodiment is 1.852 mm.

[0102] The optical imaging lens 1 of the first embodiment mainly consists of six lenses with refractive indices, 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, plus the aperture 2 and the imaging plane 4. In the first embodiment, the aperture 2 is located on the side of the third lens 30 facing the object side A1.

[0103] The first lens 10 has a negative refractive index. The optical axis region 13 of the object side 11 of the first lens 10 is convex and its circumferential region 14 is concave. The optical axis region 16 of the image side 12 of the first lens 10 is concave and its circumferential region 17 is concave. Both the object side 11 and the image side 12 of the first lens 10 are aspherical, but this is not a limitation.

[0104] The second lens 20 has a negative refractive index. The optical axis region 23 of the object-side surface 21 of the second lens 20 is concave, and its circumferential region 24 is also concave. The optical axis region 26 of the image-side surface 22 of the second lens 20 is convex, and its circumferential region 27 is concave. Both the object-side surface 21 and the image-side surface 22 of the second lens 20 are aspherical, but this is not a limitation.

[0105] The third lens 30 has a positive refractive index. The optical axis region 33 and its circumferential region 34 of the object-side surface 31 of the third lens 30 are convex, and the optical axis region 36 and its circumferential region 37 of the image-side surface 32 of the third lens 30 are convex. Both the object-side surface 31 and the image-side surface 32 of the third lens 30 are aspherical, but this is not a limitation.

[0106] The fourth lens 40 has a negative refractive index. The optical axis region 43 and its circumferential region 44 of the object-side surface 41 of the fourth lens 40 are concave, and the optical axis region 46 and its circumferential region 47 of the image-side surface 42 of the fourth lens 40 are concave. Both the object-side surface 41 and the image-side surface 42 of the fourth lens 40 are aspherical, but this is not a limitation.

[0107] The fifth lens 50 has a positive refractive index. The optical axis region 53 and its circumferential region 54 of the object-side surface 51 of the fifth lens 50 are convex. The optical axis region 56 and its circumferential region 57 of the image-side surface 52 of the fifth lens 50 are convex. Both the object-side surface 51 and the image-side surface 52 of the fifth lens 50 are aspherical, but this is not a limitation.

[0108] The sixth lens 60 has a negative refractive index. The optical axis region 63 of the object-side surface 61 of the sixth lens 60 is convex, and its circumferential region 64 is concave. The optical axis region 66 of the image-side surface 62 of the sixth lens 60 is concave, and its circumferential region 67 is convex. Both the object-side surface 61 and the image-side surface 62 of the sixth lens 60 are aspherical, but this is not a limitation.

[0109] In the optical imaging lens 1 of the present invention, all twelve surfaces—object side surfaces 11, 21, 31, 41, 51, 61 and image side surfaces 12, 22, 32, 42, 52, 62—from the first lens 10 to the sixth lens 60 can be aspherical surfaces, but are not limited thereto. If they are aspherical surfaces, they are defined by the following formula:

[0110]

[0111] in:

[0112] Y represents the perpendicular distance between a point on the aspherical surface and the optical axis I;

[0113] Z represents the depth of the aspherical surface (the perpendicular distance between a 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 optical axis I of the aspherical surface).

[0114] R represents the radius of curvature of the lens surface near the optical axis I;

[0115] K is the conic constant;

[0116] a i Let a be the i-th order aspherical coefficient, where the a2 coefficient in each embodiment is 0.

[0117] The material parameters of the lens disclosed in the optical datasheet of the embodiments are in the international glass code format of nd refractive index and Vd Abbe number, so that those skilled in the art can know the specific material implementation. Here, nd is the refractive index of the material at the d-helium yellow line of 587.56 nm, and Vd is calculated using the refractive index of the material at the d, F, and C wavelengths of the Fraunhofer spectrum. The focal length values ​​disclosed in the optical datasheet of the embodiments are calculated based on the refractive index of the optical system implemented at that wavelength. Since the primary wavelength of the embodiments of the present invention is 555 nm, the focal length values ​​of the present invention are calculated based on the refractive index of the material at 555 nm.

[0118] The optical data of the optical imaging lens 1 system in the first embodiment are as follows: Figure 20 As shown, the aspherical data is as follows Figure 21As 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 (EFL) is , and the half field of view (HFOV) is half of the maximum field of view (Field of View) of the overall optical imaging lens. 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 = 2.124 mm; HFOV = 60.000 degrees; TTL = 6.027 mm; Fno = 2.020; ImgH = 1.852 mm. Longitudinal spherical aberration = ±0.01 mm; sagittal aberration = ±0.02 mm; meridional aberration = ±0.08 mm; distortion aberration = ±50%.

[0119] Second Embodiment

[0120] Please see Figure 8 The following illustrates a second embodiment of the optical imaging lens 1 of the present invention. Note that, starting with the second embodiment, for the sake of simplification and clarity of the drawings, only the optical axis regions and circumferential regions of each lens with different surface shapes from those of the first embodiment are specifically marked on the drawings. The optical axis regions and circumferential regions with the same surface shapes as those of the lenses in the first embodiment, such as concave or convex surfaces, are not separately marked. For the longitudinal spherical aberration on the imaging plane 4 in the second embodiment, please refer to... Figure 9 For part A and the field curvature aberration in the sagittal direction, please refer to [reference needed]. Figure 9 For Part B and the field curvature aberrations in the meridional direction, please refer to [reference needed]. Figure 9 For part C and distortion aberrations, please refer to [reference needed]. Figure 9 Part D. The design of the second embodiment is similar to that of the first embodiment, except that the lens refractive index, lens radius of curvature, thickness, lens aspherical coefficient, or back focal length are different. In addition, in this embodiment, the first lens 10 has a positive refractive index, the circumferential region 14 of the object side 11 of the first lens 10 is convex, and the circumferential region 67 of the image side 62 of the sixth lens 60 is concave.

[0121] Detailed optical data for the second embodiment are as follows: Figure 22 As shown, the aspherical data is as follows Figure 23 As shown. In this embodiment, EFL = 2.218 mm; HFOV = 59.989 degrees; TTL = 5.860 mm; Fno = 2.020; ImgH = 1.852 mm. Longitudinal spherical aberration = ±0.018 mm; sagittal aberration = ±0.08 mm; meridional aberration = ±0.12 mm; distortion aberration = ±60%. In particular: 1. The system length TTL of this embodiment is shorter than that of the first embodiment; 2. The focal length of this embodiment is greater than that of the first embodiment.

[0122] Third Embodiment

[0123] Please see Figure 10 This illustrates a third embodiment of the optical imaging lens 1 of the present invention. For details regarding the longitudinal spherical aberration on the imaging plane 4 in the third embodiment, please refer to... Figure 11 For part A and the field curvature aberration in the sagittal direction, please refer to [reference needed]. Figure 11 For Part B and the field curvature aberrations in the meridional direction, please refer to [reference needed]. Figure 11 For part C and distortion aberrations, please refer to [reference needed]. Figure 11 Part D. The design of the third embodiment is similar to that of the first embodiment, except that the lens refractive index, lens radius of curvature, thickness, lens aspherical coefficient, or back focal length are different. In addition, in this embodiment, the circumferential region 14 of the object side 11 of the first lens 10 is convex, the second lens 20 has a positive refractive index, the circumferential region 27 of the image side 22 of the second lens 20 is convex, the fifth lens 50 has a negative refractive index, the optical axis region 56 of the image side 52 of the fifth lens 50 is concave, and the sixth lens 60 has a positive refractive index.

[0124] Detailed optical data for the third embodiment are as follows: Figure 24 As shown, the aspherical data is as follows Figure 25 As shown, in this embodiment, EFL = 2.160 mm; HFOV = 60.000 degrees; TTL = 6.051 mm; Fno = 2.020; ImgH = 1.852 mm. Longitudinal spherical aberration = ±0.016 mm; sagittal aberration = ±0.020 mm; meridional aberration = ±0.06 mm; distortion aberration = ±60%. In particular, the thickness difference between the lens optical axis and the circumferential region in this embodiment is smaller than in the first embodiment, making it easier to manufacture and thus resulting in a higher yield.

[0125] Fourth embodiment

[0126] Please see Figure 12 This illustrates a fourth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 4 in the fourth embodiment, please refer to... Figure 13 For part A and the field curvature aberration in the sagittal direction, please refer to [reference needed]. Figure 13 For Part B and the field curvature aberrations in the meridional direction, please refer to [reference needed]. Figure 13 For part C and distortion aberrations, please refer to [reference needed]. Figure 13Part D. The design of the fourth embodiment is similar to that of the first embodiment, except that the lens refractive index, lens radius of curvature, thickness, lens aspherical coefficient, or back focal length are different. In addition, in this embodiment, the circumferential region 14 of the object side 11 of the first lens 10 is convex, the second lens 20 has a positive refractive index, the circumferential region 24 of the object side 21 of the second lens 20 is convex, the circumferential region 27 of the image side 22 of the second lens 20 is convex, the third lens 30 has a negative refractive index, the optical axis region 33 of the object side 31 of the third lens 30 is concave, and the circumferential region 67 of the image side 62 of the sixth lens 60 is concave.

[0127] Detailed optical data for the fourth embodiment are as follows: Figure 26 As shown, the aspherical data is as follows Figure 27 As shown. In this embodiment, EFL = 2.156 mm; HFOV = 58.000 degrees; TTL = 5.918 mm; Fno = 2.020; ImgH = 1.852 mm. Longitudinal spherical aberration = ±0.08 mm; sagittal aberration = ±0.1 mm; meridional aberration = ±0.25 mm; distortion aberration = ±50%. In particular: 1. The system length TTL of this embodiment is shorter than that of the first embodiment; 2. The longitudinal spherical aberration of this embodiment is better than that of the first embodiment.

[0128] Fifth Embodiment

[0129] Please see Figure 14 This illustrates a fifth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 4 in the fifth embodiment, please refer to... Figure 15 For part A and the field curvature aberration in the sagittal direction, please refer to [reference needed]. Figure 15 For Part B and the field curvature aberrations in the meridional direction, please refer to [reference needed]. Figure 15 For part C and distortion aberrations, please refer to [reference needed]. Figure 15 Part D. The design of the fifth embodiment is similar to that of the first embodiment, except that the lens refractive index, lens radius of curvature, thickness, lens aspherical coefficient, or back focal length are different. In addition, in this embodiment, the second lens 20 has a positive refractive index.

[0130] Detailed optical data for the fifth embodiment are as follows: Figure 28 As shown, the aspherical data is as follows Figure 29 As shown. In this embodiment, EFL = 1.999 mm; HFOV = 59.999 degrees; TTL = 5.997 mm; Fno = 2.020; ImgH = 1.852 mm. Longitudinal spherical aberration = ±0.025 mm; sagittal aberration = ±0.05 mm; meridional aberration = ±0.08 mm; distortion aberration = ±50% mm. In particular, the system length TTL of this embodiment is shorter than that of the first embodiment.

[0131] Sixth Embodiment

[0132] Please see Figure 16 This illustrates a sixth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 4 in the sixth embodiment, please refer to... Figure 17 For part A and the field curvature aberration in the sagittal direction, please refer to [reference needed]. Figure 17 For Part B and the field curvature aberrations in the meridional direction, please refer to [reference needed]. Figure 17 For part C and distortion aberrations, please refer to [reference needed]. Figure 17 Part D. The design of the sixth embodiment is similar to that of the first embodiment, except that the lens refractive index, lens radius of curvature, thickness, lens aspherical coefficient, or back focal length are different. In addition, in this embodiment, the circumferential region 14 of the object side 11 of the first lens 10 is convex, the optical axis region 26 of the image side 22 of the second lens 20 is concave, the fourth lens 40 has positive refractive index, the optical axis region 46 of the image side 42 of the fourth lens 40 is convex, and the circumferential region 67 of the image side 62 of the sixth lens 60 is concave.

[0133] Detailed optical data for the sixth embodiment are as follows: Figure 30 As shown, the aspherical data is as follows Figure 31 As shown. In this embodiment, EFL = 1.826 mm; HFOV = 61.075 degrees; TTL = 4.926 mm; Fno = 2.020; ImgH = 1.852 mm. Longitudinal spherical aberration = ±0.1 mm; sagittal aberration = ±0.1 mm; meridional aberration = ±0.2 mm; distortion aberration = ±50%. In particular: 1. The system length TTL of this embodiment is shorter than that of the first embodiment; 2. The half-angle of this embodiment is larger than that of the first embodiment; 3. The thickness difference between the optical axis and the circumferential region of the lens in this embodiment is smaller than that in the first embodiment, making it easier to manufacture and thus resulting in a higher yield.

[0134] Seventh Embodiment

[0135] Please see Figure 18 This illustrates a seventh embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 4 in the seventh embodiment, please refer to... Figure 19 For part A and the field curvature aberration in the sagittal direction, please refer to [reference needed]. Figure 19 For Part B and the field curvature aberrations in the meridional direction, please refer to [reference needed]. Figure 19 For part C and distortion aberrations, please refer to [reference needed]. Figure 19 Part D. The design of the seventh embodiment is similar to that of the first embodiment, except that the lens refractive index, lens radius of curvature, thickness, lens aspherical coefficient, or back focal length are different. In addition, in this embodiment, the circumferential region 27 of the image side 22 of the second lens 20 is convex, and the sixth lens 60 has a positive refractive index.

[0136] Detailed optical data for the seventh embodiment are as follows: Figure 32 As shown, the aspherical data is as follows Figure 33 As shown. In this embodiment, EFL = 1.707 mm; HFOV = 61.026 degrees; TTL = 7.370 mm; Fno = 2.020; ImgH = 1.853 mm. Longitudinal spherical aberration = ±0.008 mm; sagittal aberration = ±0.015 mm; meridional aberration = ±0.03 mm; distortion aberration = ±50%. In particular: 1. The half-angle of view in this embodiment is greater than that in the first embodiment; 2. The longitudinal spherical aberration in this embodiment is better than that in the first embodiment; 3. The meridional field curvature aberration in this embodiment is better than that in the first embodiment; 4. The thickness difference between the optical axis and the circumferential region of the lens in this embodiment is smaller than that in the first embodiment, making it easier to manufacture and thus resulting in a higher yield.

[0137] In addition, the key parameters of each embodiment are summarized in [the relevant section]. Figure 34 , Figure 35 and Figure 36 middle.

[0138] Various embodiments of the present invention provide a six-element optical imaging lens that is lightweight, compact, has a large field of view, excellent imaging quality, good optical performance, and is technically feasible. For example, designs that satisfy the following lens surface shapes or parameters can effectively optimize the imaging quality of the optical imaging lens 1 of the present invention and achieve the corresponding beneficial effects:

[0139] 1. When the optical axis region 13 of the object-side surface 11 of the first lens 10 is convex, and the optical axis region 23 of the object-side surface 21 of the second lens 20 is concave, the optical axis region 43 of the object-side surface 41 of the fourth lens 40 is concave, the circumferential region 47 of the image-side surface 42 of the fourth lens 40 is concave, 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 convex, and the optical axis region 63 of the object-side surface 61 of the sixth lens 60 is convex, light rays from different angles can be converged, correcting aberrations in the central field of view of the imaging plane. Furthermore, by setting the fifth or sixth lens to be the thickest on the optical axis among the six lenses, distortions in the peripheral field of view can be further corrected. Furthermore, by matching the length between the aperture and the lens, when HFOV*Fno / D31t41≧80.000 degrees / mm is met, the half field of view can be increased while maintaining image quality. Among them, the optimal range of HFOV*Fno / D31t41≧80.000 degrees / mm is 385.000≧HFOV*Fno / D31t41≧80.000 degrees / mm.

[0140] 2. When the circumferential region 34 of the object-side surface 31 of the third lens 30 is convex, and the optical axis region 23 of the object-side surface 21 of the second lens 20 is concave, the optical axis region 43 of the object-side surface 41 of the fourth lens 40 is concave, the circumferential region 47 of the image-side surface 42 of the fourth lens 40 is concave, 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 convex, and the optical axis region 63 of the object-side surface 61 of the sixth lens 60 is convex, light rays from different angles can be converged, correcting aberrations in the central field of view of the imaging plane. Furthermore, by setting the fifth or sixth lens to be the thickest on the optical axis among the six lenses, distortions in the peripheral field of view can be further corrected. Furthermore, by matching the length between the aperture and the lens, when HFOV*Fno / D31t41≧80.000 degrees / mm is met, the half field of view can be increased while maintaining image quality. Among them, the optimal range of HFOV*Fno / D31t41≧80.000 degrees / mm is 385.000≧HFOV*Fno / D31t41≧80.000 degrees / mm.

[0141] 3. When the optical axis region 23 of the object-side surface 21 of the second lens 20 is concave, and this is combined with the optical axis region 43 of the object-side surface 41 of the fourth lens 40 being concave, the circumferential region 47 of the image-side surface 42 of the fourth lens 40 being concave, the circumferential region 54 of the object-side surface 51 of the fifth lens 50 being convex, the circumferential region 57 of the image-side surface 52 of the fifth lens 50 being convex, and the optical axis region 63 of the object-side surface 61 of the sixth lens 60 being convex, light rays from different angles can be converged, correcting aberrations in the central field of view of the imaging plane. Furthermore, by setting the fifth or sixth lens to be the thickest on the optical axis among the six lenses, distortions in the peripheral field of view can be further corrected. Additionally, by matching the lengths between the aperture and the lenses, when HFOV*Fno / D31t41≧80.00 degrees / mm0, the half field of view can be increased. When (ImgH+T2) / Gmin≦110.000 is met, appropriate image height and good image quality can be maintained. Among them, HFOV*Fno / D31t41≧80.000 degrees / mm, the optimal range is 385.000≧HFOV*Fno / D31t41≧80.000 degrees / mm, and (ImgH+T2) / Gmin≦110.000, the optimal range is 23.000≦(ImgH+T2) / Gmin≦110.000.

[0142] 4. When the lens material meets the following configuration relationship, it is beneficial to the transmission and refraction of imaging light, and at the same time effectively improves chromatic aberration, so that the optical imaging lens has excellent optical quality.

[0143] (υ2+υ3+υ4) / υ6≦2.000, with a preferred range of 1.300≦(υ2+υ3+υ4) / υ6≦2.000.

[0144] The optimal range is 2.200≧(υ5+υ6) / υ1≧1.900.

[0145] 5. In order to shorten the length of the lens system and ensure image quality, while taking into account the ease of manufacturing, the air gap between the lenses is reduced or the lens thickness is appropriately shortened. If the numerical limits of the following conditional formula are met, the embodiments of the present invention can have a better configuration.

[0146] EFL / (Gmin+T4)≧5.500, with the optimal range being 10.500≧EFL / (Gmin+T4)≧5.500;

[0147] ImgH / Gavg ≤ 8.000, with a preferred range of 3.000 ≤ ImgH / Gavg ≤ 8.000;

[0148] TL / (T2+T3)≦5.000, with a preferred range of 2.800≦TL / (T2+T3)≦5.000;

[0149] HFOV / ALT ≥ 13,000 degrees / mm, with a preferred range of 25,000 ≥ HFOV / ALT ≥ 13,000 degrees / mm;

[0150] Fno*Tmax / Tavg≦3.800, with the optimal range being 2.400≦Fno*Tmax / Tavg≦3.800;

[0151] D11t22 / D42t61≦2.000, with a preferred range of 1.200≦D11t22 / D42t61≦2.000;

[0152] TTL / D12t31 ≥ 2.900, with a preferred range of 4.600 ≥ TTL / D12t31 ≥ 2.900;

[0153] (BFL+G12) / D32t42≧2.000, with a preferred range of 10.500≧(BFL+G12) / D32t42≧2.000;

[0154] (EFL+D42t52) / D22t32≧2.800, with a preferred range of 10.200≧(EFL+D42t52) / D22t32≧2.800;

[0155] Fno*TL / D11t21≦8.000, with a preferred range of 5.600≦Fno*TL / D11t21≦8.000;

[0156] HFOV*(Tmax+G45)≦75.000 degrees·mm, with a preferred range of 37.200≦HFOV*(Tmax+G45)≦75.000 degrees·mm;

[0157] (AAG+T3+T6) / Gavg≦9.000, with a preferred range of 5.800≦(AAG+T3+T6) / Gavg≦9.000;

[0158] (ALT+D41t51) / D11t21≦3.000, with a preferred range of 1.900≦(ALT+D41t51) / D11t21≦3.000;

[0159] AAG / Tmin ≥ 5.000, with a preferred range of 14.700 ≥ AAG / Tmin ≥ 5.000;

[0160] (BFL+EFL) / D12t22≦3.000, with a preferred range of 1.200≦(BFL+EFL) / D12t22≦3.000.

[0161] In addition, any combination of parameters in the embodiments can be selected to increase lens constraints, thereby facilitating lens design with the same architecture as the present invention.

[0162] 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, have a small aperture value, have excellent image quality, or improve the assembly yield and improve the shortcomings of the prior art. Furthermore, the use of plastic material for the lens in the embodiments of the present invention can further reduce the weight of the lens and save costs.

[0163] The numerical ranges, including the maximum and minimum values, obtained from the combined proportional relationships of the optical parameters disclosed in the various embodiments of the present invention can all be implemented accordingly.

[0164] The embodiments of this invention disclose optical parameters such as focal length, thickness, and Abbe number, but are not limited to these parameters. For example, the present invention discloses an optical parameter A and an optical parameter B in various embodiments. The specific explanations of the ranges covered by these optical parameters, the comparison relationships between the optical parameters, and the conditional ranges covered by the multiple embodiments are as follows:

[0165] (1) The range covered by the optical parameters, for example: α2≦A≦α1 or β2≦B≦β1, where α1 is the maximum value of optical parameter A in multiple embodiments, α2 is the minimum value of optical parameter A in multiple embodiments, β1 is the maximum value of optical parameter B in multiple embodiments, and β2 is the minimum value of optical parameter B in multiple embodiments.

[0166] (2) Comparison of optical parameters, for example: A is greater than B or A is less than B.

[0167] (3) The conditional range covered by multiple embodiments, specifically, the combination or proportional relationships obtained by possible calculations of a plurality of optical parameters of the same embodiment, defined as E. E may be, for example: A+B or AB or A / B or A*B or (A*B). 1 / 2 E satisfies the condition E≦γ1 or E≧γ2 or γ2≦E≦γ1, where γ1 and γ2 are the values ​​obtained by calculation of optical parameter A and optical parameter B in the same embodiment, and γ1 is the maximum value in multiple embodiments of the present invention, and γ2 is the minimum value in multiple embodiments of the present invention.

[0168] The range covered by the aforementioned optical parameters, the comparative relationships between the optical parameters, and the maximum, minimum, and numerical ranges within these conditions are all features upon which the present invention can be implemented, and all fall within the scope disclosed in the present invention. The above are merely illustrative examples and should not be construed as limiting.

[0169] All embodiments of the present invention are feasible, and some feature combinations can be extracted from the same embodiment. Compared with the prior art, these feature combinations can achieve unexpected effects. These feature combinations include, but are not limited to, combinations of features such as surface shape, refractive index, and conditional features. The disclosure of the embodiments of the present invention is a specific example to illustrate the principles of the present invention and should not be limited to the disclosed embodiments. Furthermore, the embodiments and their accompanying drawings are only for illustrative purposes and are not limited thereto.

[0170] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made in accordance with the claims of the present invention shall be covered by the present invention.

Claims

1. An optical imaging lens, characterized in that: Along an optical axis from an object side to an image side, there are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, and each of the first lens to the sixth lens includes an object side facing the object side and allowing imaging light to pass through, and an image side facing the image side and allowing imaging light to pass through. The optical axis region on the side of the first lens is convex. The optical axis region on the side of the second lens is concave; The fourth lens has a concave optical axis region on the object side and a concave circumferential region on the image side. A circumferential region on the object side of the fifth lens is convex, and a circumferential region on the image side of the fifth lens is convex; and The optical axis region on the side of the sixth lens is convex. The optical imaging lens has only the six lenses mentioned above. HFOV is defined as half the field of view of the optical imaging lens, Fno is defined as an aperture value of the optical imaging lens, and D31t41 is defined as the distance on the optical axis from the object side of the third lens to the object side of the fourth lens, and satisfies HFOV*Fno / D31t41≧80.000 degrees / mm. Among the six lenses, the thickest one on the optical axis is either the fifth lens or the sixth lens.

2. An optical imaging lens, characterized in that: Along an optical axis from an object side to an image side, there are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, and each of the first lens to the sixth lens includes an object side facing the object side and allowing imaging light to pass through, and an image side facing the image side and allowing imaging light to pass through. The optical axis region on the side of the second lens is concave; A circumferential region on the side of the object of the third lens is convex. The fourth lens has a concave optical axis region on the object side and a concave circumferential region on the image side. A circumferential region on the object side of the fifth lens is convex, and a circumferential region on the image side of the fifth lens is convex; and The optical axis region on the side of the sixth lens is convex. The optical imaging lens has only the six lenses mentioned above. HFOV is defined as half the field of view of the optical imaging lens, Fno is defined as an aperture value of the optical imaging lens, and D31t41 is defined as the distance on the optical axis from the object side of the third lens to the object side of the fourth lens, and satisfies HFOV*Fno / D31t41≧80.000 degrees / mm. Among the six lenses, the thickest one on the optical axis is either the fifth lens or the sixth lens.

3. The optical imaging lens as claimed in claim 1 or 2, characterized in that: Wherein EFL is defined as an effective focal length of the optical imaging lens, Gmin is defined as the minimum value of the five air gaps between the first lens and the sixth lens on the optical axis, T4 is defined as the thickness of the fourth lens on the optical axis, and the optical imaging lens satisfies the following condition: EFL / (Gmin+T4)≧5.

500.

4. The optical imaging lens as claimed in claim 1 or 2, characterized in that: Where ImgH is defined as an image height of the optical imaging lens, Gavg is an average value of the five air gaps of the first lens to the sixth lens on the optical axis, and the optical imaging lens satisfies the following condition: ImgH / Gavg≦8.

000.

5. The optical imaging lens as claimed in claim 1 or 2, characterized in that: Where TL is defined as a distance on the optical axis from the object side of the first lens to the image side of the sixth lens, T2 is defined as a thickness on the optical axis of the second lens, T3 is defined as a thickness on the optical axis of the third lens, and the optical imaging lens satisfies the following condition: TL / (T2+T3)≦5.

000.

6. An optical imaging lens, characterized in that: Along an optical axis from an object side to an image side, there are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, and each of the first lens to the sixth lens includes an object side facing the object side and allowing imaging light to pass through, and an image side facing the image side and allowing imaging light to pass through. The optical axis region on the side of the second lens is concave; The fourth lens has a concave optical axis region on the object side and a concave circumferential region on the image side. A circumferential region on the object side of the fifth lens is convex, and a circumferential region on the image side of the fifth lens is convex; and The optical axis region on the side of the sixth lens is convex. The optical imaging lens has only the six lenses mentioned above. HFOV is defined as half the field of view of the optical imaging lens, Fno is defined as an aperture value of the optical imaging lens, D31t41 is defined as the distance on the optical axis from the object side of the third lens to the object side of the fourth lens, ImgH is defined as an image height of the optical imaging lens, T2 is defined as a thickness of the second lens on the optical axis, and Gmin is defined as the minimum value of the five air gaps on the optical axis from the first lens to the sixth lens, and satisfies HFOV*Fno / D31t41≧80.000 degrees / mm and (ImgH+T2) / Gmin≦110.

000. Among the six lenses, the thickest on the optical axis is either the fifth lens or the sixth lens.

7. The optical imaging lens as claimed in claim 1, 2, or 6, characterized in that: Where υ2 is defined as the Vd Abbe number of the second lens, υ3 is defined as the Vd Abbe number of the third lens, υ4 is defined as the Vd Abbe number of the fourth lens, and υ6 is defined as the Vd Abbe number of the sixth lens, and the optical imaging lens satisfies the following condition: (υ2+υ3+υ4) / υ6≦2.

000.

8. The optical imaging lens as claimed in claim 1, 2, or 6, characterized in that: Where υ1 is defined as the Vd Abbe number of the first lens, υ5 is defined as the Vd Abbe number of the fifth lens, and υ6 is defined as the Vd Abbe number of the sixth lens, and the optical imaging lens satisfies the following condition: (υ5+υ6) / υ1≧1.

900.

9. The optical imaging lens as claimed in claim 1, 2, or 6, characterized in that: Wherein ALT is defined as the sum of the thicknesses of one of the six lenses from the first lens to the sixth lens on the optical axis, and the optical imaging lens satisfies the following condition: HFOV / ALT≧13.

000.

10. The optical imaging lens as claimed in claim 1, 2, or 6, characterized in that: Where Tmax is defined as the maximum value of the six thicknesses of the first lens to the sixth lens on the optical axis, and Tavg is defined as the average value of the six thicknesses of the first lens to the sixth lens on the optical axis, and the optical imaging lens satisfies the following condition: Fno*Tmax / Tavg≦3.

800.

11. The optical imaging lens as claimed in claim 1, 2, or 6, characterized in that: Where D11t22 is the distance on the optical axis from the object side of the first lens to the image side of the second lens, and D42t61 is the distance on the optical axis from the image side of the fourth lens to the object side of the sixth lens, and the optical imaging lens satisfies the following condition: D11t22 / D42t61≦2.

000.

12. The optical imaging lens as claimed in claim 1, 2, or 6, characterized in that: Where TTL is defined as the distance from the object side of the first lens to an imaging surface on the optical axis, and D12t31 is defined as the distance from the image side of the first lens to the object side of the third lens on the optical axis, and the optical imaging lens satisfies the following condition: TTL / D12t31≧2.

900.

13. The optical imaging lens as claimed in claim 1, 2, or 6, characterized in that: Wherein BFL is defined as the distance from the image-side surface of the sixth lens to an imaging surface on the optical axis, G12 is defined as the air gap between the first lens and the second lens on the optical axis, D32t42 is the distance from the image-side surface of the third lens to the image-side surface of the fourth lens on the optical axis, and the optical imaging lens satisfies the following condition: (BFL+G12) / D32t42≧2.

000.

14. The optical imaging lens as claimed in claim 1, 2, or 6, characterized in that: Where EFL is defined as an effective focal length of the optical imaging lens, D42t52 is a distance on the optical axis from the image side of the fourth lens to the image side of the fifth lens, and D22t32 is a distance on the optical axis from the image side of the second lens to the image side of the third lens. The optical imaging lens satisfies the following condition: (EFL+D42t52) / D22t32≧2.

800.

15. The optical imaging lens as claimed in claim 1, 2, or 6, characterized in that: Where TL is defined as a distance on the optical axis from the object side of the first lens to the image side of the sixth lens, and D11t21 is a distance on the optical axis from the object side of the first lens to the object side of the second lens. The optical imaging lens satisfies the following condition: Fno*TL / D11t21≦8.

000.

16. The optical imaging lens as claimed in claim 1, 2, or 6, characterized in that: Where Tmax is defined as the maximum value of the six thicknesses of the first lens to the sixth lens on the optical axis, G45 is defined as an air gap between the fourth lens and the fifth lens on the optical axis, and the optical imaging lens satisfies the following condition: HFOV*(Tmax+G45)≦75.

000.

17. The optical imaging lens as claimed in claim 1, 2, or 6, characterized in that: Where AAG is defined as the sum of the five air gaps of 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 Gavg is the average value of the five air gaps of the first lens to the sixth lens on the optical axis, and the optical imaging lens satisfies the following condition: (AAG+T3+T6) / Gavg≦9.

000.

18. The optical imaging lens as claimed in claim 1, 2, or 6, characterized in that: Where ALT is defined as the total thickness of one of the six lenses from the first lens to the sixth lens on the optical axis, D41t51 is the distance on the optical axis from the object side of the fourth lens to the object side of the fifth lens, and D11t21 is the distance on the optical axis from the object side of the first lens to the object side of the second lens. The optical imaging lens satisfies the following condition: (ALT+D41t51) / D11t21≦3.

000.

19. The optical imaging lens as claimed in claim 1, 2, or 6, characterized in that: Where AAG is defined as the sum of the five air gaps of the first lens to the sixth lens on the optical axis, Tmin is defined as the minimum of the six thicknesses of the first lens to the sixth lens on the optical axis, and the optical imaging lens satisfies the following condition: AAG / Tmin≧5.

000.

20. The optical imaging lens as claimed in claim 1, 2, or 6, characterized in that: Wherein BFL is defined as the distance from the image side surface of the sixth lens to an imaging surface on the optical axis, EFL is defined as an effective focal length of the optical imaging lens, D12t22 is the distance from the image side surface of the first lens to the image side surface of the second lens on the optical axis, and the optical imaging lens satisfies the following condition: (BFL+EFL) / D12t22≦3.000.

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