Optical imaging lens

Abstract

An optical imaging lens comprises, sequentially from the object side to the image side along the optical axis, a first lens to a sixth lens. The circumferential region of the object-side surface of the second lens is convex, the optical axis region of the object-side surface of the third lens is convex, the optical axis region of the image-side surface of the fourth lens is concave, and the circumferential region of the image-side surface of the fourth lens is concave. The optical imaging lens, having a refractive index, is composed of these six lenses and satisfies the following condition: AAG*Fno / T6≦5.700.

Description

Technical Field

[0001] This invention generally relates to an optical imaging lens. Specifically, this invention is particularly directed to an optical imaging lens primarily used for capturing images and recording videos, and can be applied to portable electronic products such as mobile phones, cameras, tablet computers, or personal digital assistants (PDAs). Prior Technology

[0002] Portable electronic devices are rapidly evolving in specifications, and their key components—optical imaging lenses—are also becoming increasingly diverse. For front-facing lenses in portable electronic devices, the pursuit is not only for wider field of view designs but also for higher resolution and image quality. Currently, the half-angle of the optical imaging lens for the front-facing camera in portable electronic devices is between 36 and 40 degrees. As users increasingly desire to capture more of the scene from a selfie perspective, wide-angle lenses with a field of view greater than 50 degrees have become the industry's development goal.

[0003] Existing wide-angle lenses, in order to capture light from more angles, firstly require increasing the effective radius of the first lens, and the aperture must be set behind the first lens to allow more light to pass through the center of the aperture, thus reducing the system's focal length and achieving the design goal of capturing a wider field of view. However, the front-facing lenses of portable electronic devices are not only for selfies, but also for full-screen designs. Therefore, increasing the effective radius of the first lens to achieve the wide-angle design goal also increases the front surface area of ​​the lens. Thus, how to maintain a small front surface area while increasing the lens's field of view is a problem that urgently needs to be solved. Summary of the Invention

[0004] Therefore, various embodiments of the present invention propose a six-element optical imaging lens that reduces the surface area in front of the lens, shortens the system length of the optical lens, ensures image quality, provides a large field of view, possesses good optical performance, and is technically feasible. The six-element optical imaging lens of the present invention, from the object side to the image side, sequentially arranges a first lens, an aperture, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens on the optical axis. The first lens, second lens, third lens, fourth lens, fifth lens, and 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.

[0005] In one embodiment of the present invention, the circumferential region of the object-side surface of the second lens is convex, the optical axis region of the object-side surface of the third lens is convex, the optical axis region of the image-side surface of the fourth lens is concave, and the circumferential region of the image-side surface of the fourth lens is concave. The optical imaging lens having a refractive index is composed of the above six lenses and satisfies the following condition: AAG*Fno / T6≦5.700.

[0006] In another embodiment of the present invention, the optical axis region of the object side of the third lens is convex, the optical axis region of the image side of the fourth lens is concave, the circumferential region of the image side of the fourth lens is concave, and the optical axis region of the image side of the fifth lens is convex. The optical imaging lens having a refractive index consists of the above six lenses and satisfies the following condition: AAG*Fno / T6≦5.700.

[0007] In another embodiment of the present invention, the optical axis region of the object side of the third lens is convex, the optical axis region of the image side of the fourth lens is concave, and the circumferential region of the image side of the fourth lens is concave. The optical imaging lens having a refractive index is composed of the above six lenses and satisfies the following conditions: D11t32 / D32t52≦1.600, and AAG*Fno / T6≦5.700.

[0008] In the optical imaging lens of the present invention, embodiments may also selectively satisfy the following conditions as needed:

[0009] ALT / (T6+BFL)≦2.400;

[0010] ALT13 / (T6+G23)≦3.600;

[0011] ALT24 / (T6+G34)≦3.200;

[0012] (T3+G12+G56) / T5≦2.000;

[0013] AAGF / T6≦2.000;

[0014] AAGB / (T4+T6)≦3.100;

[0015] (G12+T2) / T6≦1.600;

[0016] ALT / D51t62≦2.300;

[0017] ALT14 / (T6+G45)≦3.100;

[0018] (AAG+T1) / (T4+T6)≦1.600;

[0019] TL / (T4+T6)≦5.500;

[0020] AAG / (T4+T6)≦1.300;

[0021] TTL / ALT46 ≦ 3.200;

[0022] (T1+G45+G56) / T6≦2.100;

[0023] AAG / T6 ≦ 1.300;

[0024] 85.000∘ / mm≦HFOV / AAGF;

[0025] 1.000 ≤ ImgH / EFL.

[0026] Wherein, ALT13 is the sum of the thicknesses of the first to third lenses along the optical axis, ALT24 is the sum of the thicknesses of the second to fourth lenses along the optical axis, ALT14 is the sum of the thicknesses of the first to fourth lenses along the optical axis, ALT46 is the sum of the thicknesses of the fourth to sixth lenses along the optical axis, AAGB is the sum of the five air gaps of the first to sixth lenses along the optical axis plus the distance from the image side of the sixth lens to the imaging plane along the optical axis, and AAGF is the object side of the first lens. The sum of the five air gaps along the optical axis from the object side of the first lens to the image side of the second lens, plus the distance along the optical axis from the image side of the sixth lens to the imaging plane; D11t32 is the distance along the optical axis from the object side of the first lens to the image side of the third lens; D32t52 is the distance along the optical axis from the image side of the third lens to the image side of the fifth lens; D51t62 is the distance along the optical axis from the object side of the fifth lens to the image side of the sixth lens; T1 is the thickness of the first lens along the optical axis; T2 is the thickness of the second lens along the optical axis. T3 is the thickness of the third lens on the optical axis, T4 is the thickness of the fourth lens on the optical axis, T5 is the thickness of the fifth lens on the optical axis, T6 is the thickness of the sixth lens on the optical axis, G12 is the air gap between the first and second lenses on the optical axis, G23 is the air gap between the second and third lenses on the optical axis, G34 is the air gap between the third and fourth lenses on the optical axis, G45 is the air gap between the fourth and fifth lenses on the optical axis, and G56 is the air gap between the fifth and sixth lenses on the optical axis. The air gap is Fno, the aperture value of the optical imaging lens is Fno, the distance on the optical axis from the image side of the sixth lens to the image plane is BFL, the sum of the five air gaps on the optical axis from the first lens to the sixth lens is AAG, the distance on the optical axis from the object side of the first lens to the image side of the sixth lens is TL, the image height of the optical imaging lens is ImgH, the system focal length of the optical imaging lens is EFL, the sum of the thicknesses of the six lenses on the optical axis from the first lens to the sixth lens is ALT, and the half angle of view of the optical imaging lens is HFOV. Simple Explanation of the Diagram

[0027] Figures 1 to 5 illustrate schematic diagrams of the method for determining the curvature shape of the optical imaging lens of the present invention. Figure 6 illustrates a schematic diagram of a first embodiment of the optical imaging lens of the present invention. Figure 7A illustrates the longitudinal spherical aberration on the imaging plane in the first embodiment. Figure 7B illustrates the field curvature aberration in the sagittal direction of the first embodiment. Figure 7C illustrates the field curvature aberration in the meridional direction of the first embodiment. Figure 7D illustrates the distortion aberrations of the first embodiment. Figure 8 illustrates a schematic diagram of a second embodiment of the optical imaging lens of the present invention. Figure 9A illustrates the longitudinal spherical aberration on the imaging plane in the second embodiment. Figure 9B illustrates the field curvature aberration in the sagittal direction of the second embodiment. Figure 9C illustrates the field curvature aberration in the meridional direction of the second embodiment. Figure 9D illustrates the distortion aberrations of the second embodiment. Figure 10 illustrates a schematic diagram of a third embodiment of the optical imaging lens of the present invention. Figure 11A illustrates the longitudinal spherical aberration on the imaging plane in the third embodiment. Figure 11B illustrates the field curvature aberration in the sagittal direction of the third embodiment. Figure 11C illustrates the field curvature aberration in the meridional direction of the third embodiment. Figure 11D illustrates the distortion aberrations of the third embodiment. Figure 12 illustrates a schematic diagram of a fourth embodiment of the optical imaging lens of the present invention. Figure 13A illustrates the longitudinal spherical aberration on the imaging plane in the fourth embodiment. Figure 13B illustrates the field curvature aberration in the sagittal direction of the fourth embodiment. Figure 13C illustrates the field curvature aberration in the meridional direction of the fourth embodiment. Figure 13D illustrates the distortion aberrations of the fourth embodiment. Figure 14 illustrates a fifth embodiment of the optical imaging lens of the present invention. Figure 15A illustrates the longitudinal spherical aberration on the imaging plane in the fifth embodiment. Figure 15B illustrates the field curvature aberration in the sagittal direction of the fifth embodiment. Figure 15C illustrates the field curvature aberration in the meridional direction of the fifth embodiment. Figure 15D illustrates the distortion aberrations of the fifth embodiment. Figure 16 illustrates a schematic diagram of a sixth embodiment of the optical imaging lens of the present invention. Figure 17A illustrates the longitudinal spherical aberration on the imaging plane in the sixth embodiment. Figure 17B illustrates the field curvature aberration in the sagittal direction of the sixth embodiment. Figure 17C illustrates the field curvature aberration in the meridional direction of the sixth embodiment. Figure 17D illustrates the distortion aberrations of the sixth embodiment. Figure 18 illustrates a schematic diagram of a seventh embodiment of the optical imaging lens of the present invention. Figure 19A illustrates the longitudinal spherical aberration on the imaging plane in the seventh embodiment. Figure 19B illustrates the field curvature aberration in the sagittal direction of the seventh embodiment. Figure 19C illustrates the field curvature aberration in the meridional direction of the seventh embodiment. Figure 19D illustrates the distortion aberrations of the seventh embodiment. Figure 20 illustrates a schematic diagram of an eighth embodiment of the optical imaging lens of the present invention. Figure 21A illustrates the longitudinal spherical aberration on the imaging plane in the eighth embodiment. Figure 21B illustrates the field curvature aberration in the sagittal direction of the eighth embodiment. Figure 21C illustrates the field curvature aberration in the meridional direction of the eighth embodiment. Figure 21D illustrates the distortion aberrations of the eighth embodiment. Figure 22 shows detailed optical data for the first embodiment. Figure 23 shows detailed aspherical data for the first embodiment. Figure 24 shows detailed optical data for the second embodiment. Figure 25 shows the detailed aspherical data of the second embodiment. Figure 26 shows detailed optical data for the third embodiment. Figure 27 shows the detailed aspherical data of the third embodiment. Figure 28 shows detailed optical data for the fourth embodiment. Figure 29 shows the detailed aspherical data for the fourth embodiment. Figure 30 shows detailed optical data for the fifth embodiment. Figure 31 shows the detailed aspherical data of the fifth embodiment. Figure 32 shows detailed optical data for the sixth embodiment. Figure 33 shows the detailed aspherical data for the sixth embodiment. Figure 34 shows detailed optical data for the seventh embodiment. Figure 35 shows the detailed aspherical data of the seventh embodiment. Figure 36 shows detailed optical data for the eighth embodiment. Figure 37 shows the detailed aspherical data for the eighth embodiment. Figure 38 shows the key parameters of each embodiment. Figure 39 shows the key parameters of each embodiment. Implementation

[0028] 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.

[0029] The optical system described in this specification includes at least one lens that receives imaging rays incident on the optical system, ranging from parallel to the optical axis to within a half-angle of view (HFOV) relative to the optical axis. The imaging rays are imaged on an imaging plane by the optical system. The statement "a lens has a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens, calculated using Gaussian optics theory, is positive (or negative). The statement "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) (as shown in Figure 1). The object-side (or image-side) of the lens can be divided into different regions depending on its 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.

[0030] Figure 1 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 the surface with the optical axis I. As illustrated in Figure 1, 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, 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 Figure 4), and the Nth transition point (farthest from the optical axis I).

[0031] The region from the center point to the first conversion point TP1 is defined as the optical axis region, which includes the center point. The region radially outward from the Nth conversion point farthest from the optical axis I to the optical boundary OB is defined as the circumferential region. In some embodiments, a relay region may be additionally included between the optical axis region and the circumferential region; the number of relay regions depends on the number of conversion points.

[0032] 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.

[0033] In addition, referring to Figure 1, lens 100 may also include an assembly portion 130 extending radially outward from optical boundary OB. Assembly portion 130 is generally used for assembling lens 100 to a corresponding element (not shown) in an optical system. Imaging rays do not reach assembly portion 130. The structure and shape of assembly portion 130 are merely illustrative examples of the invention and are not intended to limit the scope of the invention. Assembly portion 130 of the lens discussed below may be partially or entirely omitted in the figures.

[0034] Referring to Figure 2, the region between the center point CP and the first conversion point TP1 is defined as the optical axis region Z1. The region between the first conversion point TP1 and the optical boundary OB of the lens surface is defined as the circumferential region Z2. As shown in Figure 2, after passing through the optical axis region Z1, the parallel ray 211 intersects the optical axis I on the image side A2 of the lens 200, meaning the focal point of the parallel ray 211 passing through the optical axis region Z1 is located at point R on the image side A2 of the lens 200. Since the ray intersects the optical axis I on the image side A2 of the lens 200, the optical axis region Z1 is convex. Conversely, the parallel ray 212 diverges after passing through the circumferential region Z2. As shown in Figure 2, the extension line EL of the parallel ray 212 after passing through the circumferential region Z2 intersects the optical axis I on the object side A1 of the lens 200, meaning the focal point of the parallel ray 212 passing through the circumferential region Z2 is located at point M on the object side A1 of the lens 200. Since the extension line EL of the light ray intersects the optical axis I at the object side A1 of the lens 200, the circumferential region Z2 is concave. In the lens 200 shown in Figure 2, 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.

[0035] 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.

[0036] Figures 3 to 5 provide examples of determining the surface shape and region boundaries of the lens region in various situations, including the aforementioned optical axis region, circumferential region, and relay region.

[0037] Figure 3 is a radial sectional view of lens 300. Referring to Figure 3, the image-side surface 320 of lens 300 has only one transition point TP1 within the optical boundary OB. The optical axis region Z1 and the circumferential region Z2 of the image-side surface 320 of lens 300 are shown in Figure 3. The R value of this image-side surface 320 is positive (i.e., R>0), therefore, the optical axis region Z1 is concave.

[0038] Generally, the surface shape of each region bounded by the transition point will be opposite to that of the adjacent region. Therefore, the transition point can be used to define the change in surface shape, that is, from the transition point, the surface changes from concave to convex or from convex to concave. In Figure 3, since the optical axis region Z1 is concave, and the surface shape changes at the transition point TP1, the circumferential region Z2 is convex.

[0039] Figure 4 is a radial sectional view of lens 400. Referring to 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.

[0040] 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 circular region Z2, which is also a convex surface. In addition, 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. Referring again to 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 between the first conversion point TP1 and the second conversion point TP2, and the circular 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 from the first conversion point TP1 to concave, the relay region Z3 is concave. Furthermore, its surface shape changes back to convex from the second conversion point TP2, so the circular region Z2 is convex.

[0041] Figure 5 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 0-50% of the distance from the optical axis I to the optical boundary OB of the lens surface, and the circumferential region is defined as 50-100% of the distance from the optical axis I to the optical boundary OB of the lens surface. Referring to the lens 500 shown in Figure 5, the optical axis region Z1 of the object-side surface 510 is defined as 50% of the distance from the optical axis I to the optical boundary OB of the lens 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 lens 500 has no transition point, the circumferential region Z2 of the object-side surface 510 is also convex. Lens 500 may further have an assembly portion (not shown) extending radially outward from the circumferential region Z2.

[0042] As shown in Figure 6, the optical imaging lens 1 of this 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, an aperture 80, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, and an image plane 91. 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 material, but this invention is not limited to this. Each lens has an appropriate refractive index. In the optical imaging lens 1 of this invention, there are only six lenses with refractive indices: 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.

[0043] Furthermore, the optical imaging lens 1 also includes an aperture stop 80, which is positioned appropriately. In Figure 6, the aperture stop 80 is positioned between the first lens 10 and the second lens 20. When light emitted from the object to be photographed (not shown) located on the object side A1 enters the optical imaging lens 1 of the present invention, it passes sequentially through the first lens 10, the aperture stop 80, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens 60, and the filter 90, and is then focused on the imaging surface 91 on the image side A2 to form a clear image. In various embodiments of the present invention, the filter 90 is positioned between the sixth lens 60 and the imaging surface 91, and it can be a filter with various suitable functions. For example, the filter 90 can be an infrared cut-off filter, which is used to prevent infrared rays in the imaging light from being transmitted to the imaging surface 91 and affecting the image quality.

[0044] 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 image-side surface also has an optical axis region and a circumferential region.

[0045] 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 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. Therefore, the sum of the thicknesses of all lenses in the optical imaging lens 1 of the present invention along the optical axis I is called ALT. That is, ALT = T1 + T2 + T3 + T4 + T5 + T6.

[0046] 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 located 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.

[0047] Furthermore, the distance from the object-side surface 11 of the first lens 10 to the imaging surface 91 on the optical axis I is the system length TTL of the optical imaging lens 1. The system focal length of the optical imaging lens 1 is EFL, the distance from the image-side surface 62 of the sixth lens 60 to the imaging surface 91 on the optical axis I is BFL, the distance from the object-side surface 11 of the first lens 10 to the image-side surface 62 of the sixth lens 60 on the optical axis I is TL, the half-angle of the optical imaging lens 1 is HFOV, and the image height of the optical imaging lens 1 is ImgH.

[0048] Furthermore, ALT13 is the sum of the thicknesses of the first to third lenses along the optical axis, namely the sum of T1, T2, and T3; ALT24 is the sum of the thicknesses of the second to fourth lenses along the optical axis, namely the sum of T2, T3, and T4; ALT14 is the sum of the thicknesses of the first to fourth lenses along the optical axis, namely the sum of T1, T2, T3, and T4; ALT46 is the sum of the thicknesses of the fourth to sixth lenses along the optical axis, namely the sum of T4, T5, and T6; AA GF is the distance on the optical axis from the object-side surface of the first lens to the object-side surface of the second lens; AAGB is the sum of the five air gaps on the optical axis from the first lens to the sixth lens plus the distance on the optical axis from the image-side surface of the sixth lens to the imaging plane; D11t32 is the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the third lens; D32t52 is the distance on the optical axis from the image-side surface of the third lens to the image-side surface of the fifth lens; D51t62 is the distance on the optical axis from the object-side surface of the fifth lens to the image-side surface of the sixth lens.

[0049] When the filter 90 is positioned between the sixth lens 60 and the imaging surface 91, G6F represents the air gap between the sixth lens 60 and the filter 90 on the optical axis I, TF represents the thickness of the filter 90 on the optical axis I, GFP represents the air gap between the filter 90 and the imaging surface 91 on the optical axis I, and BFL is the distance between the image side 62 of the sixth lens 60 and the imaging surface 91 on the optical axis I, that is, BFL = G6F + TF + GFP.

[0050] Let f1 be the focal length of the first lens 10; f2 be the focal length of the second lens 20; f3 be the focal length of the third lens 30; f4 be the focal length of the fourth lens 40; f5 be the focal length of the fifth lens 50; f6 be the focal length of the sixth lens 60; n1 be the refractive index of the first lens 10; n2 be the refractive index of the second lens 20; n3 be the refractive index of the third lens 30; n4 be the refractive index of the fourth lens 40; n5 be the refractive index of the fifth lens 50; n6 be the refractive index of the sixth lens 60; υ1 be the Abbe number of the first lens 10; υ2 be the Abbe number of the second lens 20; υ3 be the Abbe number of the third lens 30; υ4 be the Abbe number of the fourth lens 40; υ5 be the Abbe number of the fifth lens 50; and υ6 be the Abbe number of the sixth lens 60.

[0051] First Embodiment

[0052] Please refer to Figure 6, which illustrates a first embodiment of the optical imaging lens 1 of the present invention. For the first embodiment, the longitudinal spherical aberration on the imaging plane 91 is shown in Figure 7A, the sagittal field curvature aberration in Figure 7B, the tangential field curvature aberration in Figure 7C, and the distortion aberration in Figure 7D. In all embodiments, the Y-axis of each spherical aberration diagram represents the field of view, with its highest point being 1.0. The Y-axis of each aberration and distortion diagram in the embodiments represents the image height. The system image height (ImgH) of the first embodiment is 2.280 mm.

[0053] The optical imaging lens 1 of the first embodiment mainly consists of six lenses with refractive indices, an aperture 80, and an imaging plane 91. The aperture 80 of the first embodiment is disposed between the object side A1 and the first lens 10. The filter 90 can be an infrared cutoff filter.

[0054] 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 also convex. The optical axis region 16 of the image side 12 of the first lens 10 is concave, and its circumferential region 17 is also concave. Both the object side 11 and the image side 12 of the first lens are aspherical, but this is not a limitation.

[0055] The second lens 20 has a positive refractive index. The optical axis region 23 and its circumferential region 24 of the object-side surface 21 of the second lens 20 are convex, and the optical axis region 26 and its circumferential region 27 of the image-side surface 22 of the second lens 20 are convex. 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.

[0056] The third lens 30 has a positive refractive index. The optical axis region 33 of the object side 31 of the third lens 30 is convex, and its circumferential region 34 is also convex. The optical axis region 36 of the image side 32 of the third lens 30 is convex, and its circumferential region 37 is also convex. Both the object side 31 and the image side 32 of the third lens 30 are aspherical, but this is not a limitation.

[0057] 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.

[0058] The fifth lens 50 has a positive refractive index. The optical axis region 53 of the object-side surface 51 of the fifth lens 50 is concave and its circumferential region 54 is convex. The optical axis region 56 of the image-side surface 52 of the fifth lens 50 is convex and its circumferential region 57 is 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.

[0059] 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. The filter 90 is located between the image-side surface 62 and the image-forming surface 91 of the sixth lens 60.

[0060] In the optical imaging lens 1 of the present invention, from the first lens 10 to the sixth lens 60, there are a total of twelve curved surfaces: the object-side surfaces 11 / 21 / 31 / 41 / 51 / 61 and the image-side surfaces 12 / 22 / 32 / 42 / 52 / 62. If they are aspherical surfaces, these aspherical surfaces are defined by the following formula:

[0061] in:

[0062] Y represents the perpendicular distance between a point on the aspherical surface and the optical axis I;

[0063] Z represents the depth of the aspherical surface (the perpendicular distance between a point on the aspherical surface at a distance Y from the optical axis I and the tangent plane at the vertex on the optical axis I of the aspherical surface).

[0064] R represents the radius of curvature of the lens surface near the optical axis I;

[0065] K is the conic constant.

[0066] ai is the i-th order aspherical coefficient.

[0067] The optical data of the optical lens system in the first embodiment is shown in Figure 22, and the aspherical data is shown in Figure 23. In the optical lens system of the following embodiments, the aperture value (f-number) of the overall optical imaging lens is Fno, the system focal length is (EFL), 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 units for image height, radius of curvature, thickness, and focal length of the optical imaging lens are all millimeters (mm). In this embodiment, EFL = 1.487 mm; HFOV = 52.495 degrees; TTL = 4.027 mm; Fno = 4.385; image height = 2.280 mm.

[0068] Second Embodiment

[0069] Please refer to Figure 8, which illustrates a second embodiment of the optical imaging lens 1 of the present invention. Note that, starting with the second embodiment, for simplification and clarity of the diagrams, only the optical axis regions and circumferential regions of each lens with different surface types from the first embodiment are specifically marked on the figures. The optical axis regions and circumferential regions of the same surface types as 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 91 in the second embodiment, please refer to Figure 9A; for the field curvature aberration in the sagittal direction, please refer to Figure 9B; for the field curvature aberration in the meridional direction, please refer to Figure 9C; and for the distortion aberration, please refer to Figure 9D. The design of the second embodiment is similar to that of the first embodiment, except that the lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, and back focal length are different. Furthermore, in this embodiment, the circumferential region 34 of the object-side surface 31 of the third lens 30 is concave, and the optical axis region 43 of the object-side surface 41 of the fourth lens 40 is convex.

[0070] Detailed optical data for the second embodiment are shown in Figure 24, and aspherical data are shown in Figure 25. In this embodiment, EFL = 2.136 mm; HFOV = 52.452 degrees; TTL = 4.291 mm; Fno = 2.468; image height = 2.297 mm. Specifically: 1. The longitudinal spherical aberration of the second embodiment is superior to that of the first embodiment; 2. The field curvature aberration in the sagittal direction of the second embodiment is superior to that in the sagittal direction of the first embodiment; 3. The field curvature aberration in the meridional direction of the second embodiment is superior to that in the meridional direction of the first embodiment; 4. The distortion aberration of the second embodiment is superior to that of the first embodiment.

[0071] Third Embodiment

[0072] Please refer to Figure 10, which illustrates a third embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 91 in the third embodiment, please refer to Figure 11A; for the sagittal field curvature aberration, please refer to Figure 11B; for the meridional field curvature aberration, please refer to Figure 11C; and for the distortion aberration, please refer to Figure 11D. The design of the third embodiment is similar to that of the first embodiment, except that related parameters such as lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, or back focal length are different. Furthermore, in this embodiment, the circumferential region 34 of the object-side surface 31 of the third lens 30 is concave, the optical axis region 43 of the object-side surface 41 of the fourth lens 40 is convex, and the circumferential region 54 of the object-side surface 51 of the fifth lens 50 is concave.

[0073] Detailed optical data for the third embodiment is shown in Figure 26, and aspherical data is shown in Figure 27. In this embodiment, EFL = 1.351 mm; HFOV = 52.477 degrees; TTL = 4.126 mm; Fno = 1.551; image height = 2.297 mm. In particular, the field curvature aberration in the meridional direction of the third embodiment is better than that of the first embodiment.

[0074] Fourth embodiment

[0075] Please refer to Figure 12, which illustrates a fourth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 91 in the fourth embodiment, please refer to Figure 13A; for the sagittal field curvature aberration, please refer to Figure 13B; for the meridional field curvature aberration, please refer to Figure 13C; and for the distortion aberration, please refer to Figure 13D. The design of the fourth embodiment is similar to that of the first embodiment, except that the lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, and back focal length are different. Furthermore, in this embodiment, the circumferential region 34 of the object-side surface 31 of the third lens 30 is concave, and the optical axis region 43 of the object-side surface 41 of the fourth lens 40 is convex.

[0076] Detailed optical data for the fourth embodiment is shown in Figure 28, and aspherical data is shown in Figure 29. In this embodiment, EFL = 2.088 mm; HFOV = 52.465 degrees; TTL = 4.239 mm; Fno = 4.385; image height = 2.297 mm. In particular: 1. The longitudinal spherical aberration of the fourth embodiment is better than that of the first embodiment; 2. The field curvature aberration in the sagittal direction of the fourth embodiment is better than that in the sagittal direction of the first embodiment; 3. The field curvature aberration in the meridional direction of the fourth embodiment is better than that in the meridional direction of the first embodiment; 4. The distortion aberration of the fourth embodiment is better than that in the first embodiment.

[0077] Fifth Embodiment

[0078] Please refer to Figure 14, which illustrates a fifth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 91 in the fifth embodiment, please refer to Figure 15A; for the sagittal field curvature aberration, please refer to Figure 15B; for the meridional field curvature aberration, please refer to Figure 15C; and for the distortion aberration, please refer to Figure 15D. The design of the fifth embodiment is similar to that of the first embodiment, except that related parameters such as lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, and back focal length are different. Furthermore, in this embodiment, the optical axis region 43 of the object-side surface 41 of the fourth lens 40 is convex.

[0079] Detailed optical data for the fifth embodiment is shown in Figure 30, and aspherical data is shown in Figure 31. In this embodiment, EFL = 2.039 mm; HFOV = 52.495 degrees; TTL = 4.488 mm; Fno = 3.834; image height = 2.297 mm. Specifically: 1. The longitudinal spherical aberration of the fifth embodiment is superior to that of the first embodiment; 2. The field curvature aberration in the sagittal direction of the fifth embodiment is superior to that in the sagittal direction of the first embodiment; 3. The field curvature aberration in the meridional direction of the fifth embodiment is superior to that in the meridional direction of the first embodiment; 4. The distortion aberration of the fifth embodiment is superior to that of the first embodiment.

[0080] Sixth Embodiment

[0081] Please refer to Figure 16, which illustrates a sixth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 91 in the sixth embodiment, please refer to Figure 17A; for the sagittal field curvature aberration, please refer to Figure 17B; for the meridional field curvature aberration, please refer to Figure 17C; and for the distortion aberration, please refer to Figure 17D. The design of the sixth embodiment is similar to that of the first embodiment, except that the lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, and back focal length are different. Furthermore, in this embodiment, the circumferential region 34 of the object-side surface 31 of the third lens 30 is concave, the optical axis region 43 of the object-side surface 41 of the fourth lens 40 is convex, and the circumferential region 57 of the image-side surface 52 of the fifth lens 50 is concave.

[0082] Detailed optical data for the sixth embodiment is shown in Figure 32, and aspherical data is shown in Figure 33. In this embodiment, EFL = 2.297 mm; HFOV = 52.524 degrees; TTL = 4.537 mm; Fno = 3.941; image height = 2.297 mm. Specifically: 1. The half-angle of view in the sixth embodiment is greater than that in the first embodiment; 2. The longitudinal spherical aberration in the sixth embodiment is better than that in the first embodiment; 3. The field curvature aberration in the sagittal direction in the sixth embodiment is better than that in the sagittal direction in the first embodiment; 4. The field curvature aberration in the meridional direction in the sixth embodiment is better than that in the meridional direction in the first embodiment; 5. The distortion aberration in the sixth embodiment is better than that in the first embodiment.

[0083] Seventh Embodiment

[0084] Please refer to Figure 18, which illustrates a seventh embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 91 in the seventh embodiment, please refer to Figure 19A; for the sagittal field curvature aberration, please refer to Figure 19B; for the meridional field curvature aberration, please refer to Figure 19C; and for the distortion aberration, please refer to Figure 19D. The design of the seventh embodiment is similar to that of the first embodiment, except that related parameters such as lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, or back focal length are different. Furthermore, in this embodiment, the circumferential region 34 of the object-side surface 31 of the third lens 30 is concave, and the optical axis region 43 of the object-side surface 41 of the fourth lens 40 is convex.

[0085] Detailed optical data for the seventh embodiment are shown in Figure 34, and aspherical data are shown in Figure 35. In this embodiment, EFL = 2.024 mm; HFOV = 52.509 degrees; TTL = 4.480 mm; Fno = 3.524; image height = 2.297 mm. Specifically: 1. The half-angle of view in the seventh embodiment is greater than that in the first embodiment; 2. The longitudinal spherical aberration in the seventh embodiment is better than that in the first embodiment; 3. The field curvature aberration in the sagittal direction in the seventh embodiment is better than that in the sagittal direction in the first embodiment; 4. The field curvature aberration in the meridional direction in the seventh embodiment is better than that in the meridional direction in the first embodiment; 5. The distortion aberration in the seventh embodiment is better than that in the first embodiment.

[0086] Eighth embodiment

[0087] Please refer to Figure 20, which illustrates an eighth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 91 in the eighth embodiment, please refer to Figure 21A; for the sagittal field curvature aberration, please refer to Figure 21B; for the meridional field curvature aberration, please refer to Figure 21C; and for the distortion aberration, please refer to Figure 21D. The design of the eighth embodiment is similar to that of the first embodiment, except that related parameters such as lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, or back focal length are different. Furthermore, in this embodiment, the optical axis region 26 of the image-side surface 22 of the second lens 20 is concave, the circumferential region 34 of the object-side surface 31 of the third lens 30 is concave, and the circumferential region 57 of the image-side surface 52 of the fifth lens 50 is concave.

[0088] Detailed optical data for the eighth embodiment is shown in Figure 36, and aspherical data is shown in Figure 37. In this embodiment, EFL = 1.922 mm; HFOV = 52.526 degrees; TTL = 4.183 mm; Fno = 2.318; image height = 2.297 mm. Specifically: 1. The half-angle of view in the eighth embodiment is greater than that in the first embodiment; 2. The longitudinal spherical aberration in the eighth embodiment is better than that in the first embodiment; 3. The field curvature aberration in the sagittal direction in the eighth embodiment is better than that in the first embodiment; 4. The distortion aberration in the eighth embodiment is better than that in the first embodiment.

[0089] In addition, the important parameters of each embodiment are summarized in Figures 38 and 39 respectively.

[0090] The applicant discovered that the lens configuration in this case has the following characteristics and the corresponding effects it can achieve:

[0091] 1) Setting the aperture between the first and second lenses, combined with the following techniques, helps to increase the field of view while reducing the surface area in front of the lens:

[0092] 1. The first lens has a negative refractive index, the circumferential region of the object-side surface of the first lens is convex, the second lens has a positive refractive index, the optical axis region of the image-side surface of the second lens is convex, the optical axis region of the object-side surface of the third lens is convex, and the optical axis region of the image-side surface of the third lens is convex, and AAGF / T6≦2.000, preferably 0.700≦AAGF / T6≦2.000;

[0093] 2. The first lens has a negative refractive index; the circumferential region of the object-side surface of the first lens is convex; the optical axis region of the image-side surface of the second lens is convex; the optical axis region of the object-side surface of the third lens is convex; the circumferential region of the image-side surface of the fourth lens is concave; the circumferential region of the object-side surface of the sixth lens is concave; and AAGB / (T4+T6)≦3.100, preferably 1.600≦AAGB / (T4+T6)≦3.100;

[0094] 3. The first lens has a negative refractive index, the optical axis region of the object side of the first lens is convex, the circumferential region of the image side of the first lens is concave, the optical axis region of the object side of the third lens is convex, the optical axis region of the image side of the fourth lens is concave, the optical axis region of the image side of the sixth lens is concave, and AAG / T6≦1.300, preferably 0.900≦AAG / T6≦1.300.

[0095] 2) The optical imaging lens of the present invention further satisfies the following condition, which helps to maintain the system focal length and various optical parameters at an appropriate value, avoiding any parameter being too large and thus detrimental to the correction of aberrations in the overall optical imaging system, or avoiding any parameter being too small and thus affecting assembly or increasing manufacturing difficulty. 1.000≦1mgH / EFL, preferably 1.000≦1mgH / EFL≦1.700.

[0096] 3) The optical imaging lens of the present invention further satisfies the following condition, which helps to maintain an appropriate value for the thickness and spacing of each lens, avoiding any parameter being too large and thus not conducive to the overall thinning of the optical imaging lens, or avoiding any parameter being too small and thus affecting assembly or increasing the difficulty of manufacturing.

[0097] 1. (G12+T2) / T6≦1.600, with a preferred limit of 0.700≦(G12+T2) / T6≦1.600;

[0098] 2. TL / (T4+T6)≦5.500, with a preferred limit of 3.200≦TL / (T4+T6)≦5.500;

[0099] 3. AAG / (T4+T6)≦1.300, with a preferred limit of 0.600≦AAG / (T4+T6)≦1.300;

[0100] 4. (AAG+T1) / (T4+T6)≦1.600, with a preferred limit of 0.800≦(AAG+T1) / (T4+T6)≦1.600;

[0101] 5. 85,000∘ / mm ≤ HFOV / AAGF, with a preferred limit of 85,000∘ / mm ≤ HFOV / AAGF ≤ 120,000∘ / mm;

[0102] 6. TTL / ALT46 ≤ 3.100, with a preferred limit of 2.400 ≤ TTL / ALT46 ≤ 3.100;

[0103] 7. ALT / (T6+BFL)≦2.400, with a preferred limit of 1.400≦ALT / (T6+BFL)≦2.400;

[0104] 8. D11t32 / D32t52 ≤ 1.600, with a preferred limit of 0.900 ≤ D11t32 / D32t52 ≤ 1.600;

[0105] 9. ALT / D51t62 ≤ 2.300, with a preferred limit of 1.700 ≤ ALT / D51t62 ≤ 2.300;

[0106] 10. ALT13 / (T6+G23)≦3.600, with a preferred limit of 1.500≦ALT13 / (T6+G23)≦3.600;

[0107] 11. ALT24 / (T6+G34)≦3.200, with a preferred limit of 1.500≦ALT24 / (T6+G34)≦3.200;

[0108] 12. ALT14 / (T6+G45)≦3.100, with a preferred limit of 1.500≦ALT14 / (T6+G45)≦3.100;

[0109] 13. (T3+G12+G56) / T5≦2.000, with a preferred limit of 0.600≦(T3+G12+G56) / T5≦2.000;

[0110] 14. (T1+G45+G56) / T6≦2.100, with a preferred limit of 0.700≦(T1+G45+G56) / T6≦2.100;

[0111] 15. 2.600≦ImgH / AAGF, with a preferred limit of 2.600≦ImgH / AAGF≦5.000.

[0112] 4) The optical imaging lens of the present invention further satisfies the following condition, which helps to maintain the aperture value and various optical parameters at an appropriate value, avoiding any parameter being too large and thus not conducive to reducing the aperture value, or avoiding any parameter being too small and thus affecting assembly or increasing the difficulty of manufacturing.

[0113] The optimal limit is 1.600≦AAG*Fno / T6≦5.700.

[0114] In addition, any combination of parameters in the embodiment can be selected to increase lens constraints, which is beneficial for lens design with the same architecture as the present invention.

[0115] In view of the unpredictability of optical system design, under the framework of the present invention, meeting the above conditions can better enable the present invention to reduce the surface area in front of the lens, shorten the lens length, increase the aperture, improve the image quality, or improve the assembly yield, thereby improving the shortcomings of the prior art.

[0116] The exemplary limiting relationships listed above can be selectively combined and applied in varying numbers to embodiments of the present invention, and are not limited thereto. In implementing the present invention, in addition to the aforementioned relationships, further detailed structures such as concave and convex surface arrangements of lenses can be designed for a single lens or, more broadly, for multiple lenses, to enhance control over system performance and / or resolution. It should be noted that these details should be selectively combined and applied to other embodiments of the present invention, provided there is no conflict.

[0117] 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.

[0118] The foregoing outlines the features of several embodiments, enabling those skilled in the art to fully understand the various aspects of the invention. Those skilled in the art should recognize that the invention provides a basis for designing or modifying other processes and structures to achieve substantially the same functionality and / or results as the embodiments described above. Furthermore, such equivalent configurations do not depart from the spirit and scope of the invention, and various changes, substitutions, and modifications can be made without departing from that spirit and scope.

[0119] 1: Optical imaging lens A1: Object side A2: Image side I: optical axis 10: First lens 11, 21, 31, 41, 51, 61, 110, 410, 510: Side view of the object 12, 22, 32, 42, 52, 62, 120, 320: side view 13, 16, 23, 26, 33, 36, 43, 46, 53, 56, 63, 66, Z1: Optical axis region 14, 17, 24, 27, 34, 37, 44, 47, 54, 57, 64, 67, Z2: Circular area 20: Second lens 30: Third Lens 40: Fourth Lens 50: Fifth Lens 60: Sixth Lens 80: Aperture 90: Filter 91: Imaging plane 130: Assembly Department 211, 212: Parallel rays 100, 200, 300, 400, 500: Lenses CP: Center point CP1: First center point CP2: Second center point TP1: First conversion point TP2: Second conversion point OB: Optical boundary Lc: Main Ray Lm: Edge ray EL: Extension line Z3: Relay Area M, R: Intersection points T1, T2, T3, T4, T5, T6: The thickness of each lens along the optical axis

Claims

1. An optical imaging lens, comprising, in sequence along an optical axis from an object side to an image side, a first lens, an aperture, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, wherein each of the first to sixth lenses includes an object-side surface facing the object side and through which imaging light passes, and an image-side surface facing the image side and through which imaging light passes, the optical imaging lens comprising: a convex circumferential region of the object-side surface of the second lens; a convex optical axis region of the object-side surface of the third lens; and a concave optical axis region of the image-side surface of the fourth lens, and a concave circumferential region of the image-side surface of the fourth lens, wherein the refractive lens of the optical imaging lens is composed of the above six lenses, AAG is the sum of the five air gaps of the first to sixth lenses on the optical axis, Fno is the aperture value of the optical imaging lens, T6 is the thickness of the sixth lens on the optical axis, and satisfies the following condition: AAG*Fno / T6≦5.

700.

2. An optical imaging lens, comprising, in sequence along an optical axis from an object side to an image side, a first lens, an aperture, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, wherein each of the first to sixth lenses includes an object-side surface facing the object side and through which imaging light passes, and an image-side surface facing the image side and through which imaging light passes, the optical imaging lens comprising: an optical axis region of the object-side surface of the third lens being convex; an optical axis region of the image-side surface of the fourth lens being concave, and a circumferential region of the image-side surface of the fourth lens being concave; and an optical axis region of the image-side surface of the fifth lens being convex, wherein the refractive lens of the optical imaging lens is composed of the above six lenses, AAG is the sum of the five air gaps of the first to sixth lenses on the optical axis, Fno is the aperture value of the optical imaging lens, T6 is the thickness of the sixth lens on the optical axis, and satisfies the following condition: AAG*Fno / T6≦5.

700.

3. An optical imaging lens, comprising, in sequence along an optical axis from an object side to an image side, a first lens, an aperture, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, wherein each of the first lens to the sixth lens includes an object-side surface facing the object side and through which imaging light passes, and an image-side surface facing the image side and through which imaging light passes, the optical imaging lens comprising: The object-side optical axis region of the third lens is convex; and the image-side optical axis region of the fourth lens is concave, and a circumferential region of the image-side optical axis of the fourth lens is concave. The optical imaging lens with refractive index is composed of the above six lenses. D11t32 is the distance on the optical axis from the object-side of the first lens to the image-side of the third lens, D32t52 is the distance on the optical axis from the image-side of the third lens to the image-side of the fifth lens, AAG is the sum of the five air gaps on the optical axis from the first lens to the sixth lens, Fno is the aperture value of the optical imaging lens, and T6 is the thickness of the sixth lens on the optical axis. The following conditions must be met: D11t32 / D32t52≦1.600, and AAG*Fno / T6≦5.

700.

4. An optical imaging lens as described in claim 1, claim 2, or claim 3, wherein ALT is the sum of the thicknesses of the six lenses from the first lens to the sixth lens on the optical axis, BFL is the distance from the image side of the sixth lens to an imaging surface on the optical axis, and the optical imaging lens satisfies the following condition: ALT / (T6+BFL)≦2.

400.

5. An optical imaging lens as described in claim 1, claim 2, or claim 3, wherein ALT13 is the sum of the thicknesses of the three lenses from the first lens to the third lens on the optical axis, G23 is the air gap between the second lens and the third lens on the optical axis, and the optical imaging lens satisfies the following condition: ALT13 / (T6+G23)≦3.

600.

6. An optical imaging lens as claimed in claim 1, claim 2, or claim 3, wherein ALT24 is the sum of the three thicknesses of the second to the fourth lens on the optical axis, G34 is the air gap between the third and fourth lenses on the optical axis, and the optical imaging lens satisfies the following condition: ALT24 / (T6+G34)≦3.

200.

7. An optical imaging lens as described in claim 1, claim 2, or claim 3, wherein T3 is the thickness of the third lens on the optical axis, G12 is the air gap between the first lens and the second lens on the optical axis, G56 is the air gap between the fifth lens and the sixth lens on the optical axis, T5 is the thickness of the fifth lens on the optical axis, and the optical imaging lens satisfies the following condition: (T3+G12+G56) / T5≦2.

000.

8. An optical imaging lens as claimed in claim 1, claim 2, or claim 3, wherein AAGF is the distance on the optical axis from the object-side surface of the first lens to the object-side surface of the second lens, and the optical imaging lens satisfies the following condition: AAGF / T6 ≤ 2.

000.

9. An optical imaging lens as claimed in claim 1, claim 2, or claim 3, wherein AAGB is the sum of the five air gaps of the first lens to the sixth lens on the optical axis plus the distance from the image side of the sixth lens to an imaging surface on the optical axis, T4 is a thickness of the fourth lens on the optical axis, and the optical imaging lens satisfies the following condition: AAGB / (T4+T6)≦3.

100.

10. An optical imaging lens as claimed in claim 1, claim 2, or claim 3, wherein G12 is an air gap between the first lens and the second lens on the optical axis, T2 is a thickness of the second lens on the optical axis, and the optical imaging lens satisfies the following condition: (G12+T2) / T6≦1.

600.

11. An optical imaging lens as claimed in claim 1, claim 2, or claim 3, wherein ALT is the sum of the thicknesses of the six lenses from the first lens to the sixth lens on the optical axis, D51t62 is a distance on the optical axis from the object side of the fifth lens to the image side of the sixth lens, and the optical imaging lens satisfies the following condition: ALT / D51t62 ≤ 2.

300.

12. An optical imaging lens as claimed in claim 1, claim 2, or claim 3, wherein ALT14 is the sum of the four thicknesses of the first lens to the fourth lens on the optical axis, G45 is an air gap of the fourth lens to the fifth lens on the optical axis, and the optical imaging lens satisfies the following condition: ALT14 / (T6+G45)≦3.

100.

13. An optical imaging lens as claimed in claim 1, claim 2, or claim 3, wherein AAG is the sum of the five air gaps of the first lens to the sixth lens on the optical axis, T1 is a thickness of the first lens on the optical axis, T4 is a thickness of the fourth lens on the optical axis, and the optical imaging lens satisfies the following condition: (AAG+T1) / (T4+T6)≦1.

600.

14. An optical imaging lens as claimed in claim 1, claim 2, or claim 3, wherein TL is the distance on the optical axis from the object side of the first lens to the image side of the sixth lens, T4 is a thickness of the fourth lens on the optical axis, and the optical imaging lens satisfies the following condition: TL / (T4+T6)≦5.

500.

15. An optical imaging lens as claimed in claim 1, claim 2, or claim 3, wherein AAG is the sum of the five air gaps of the first lens to the sixth lens on the optical axis, T4 is the thickness of the fourth lens on the optical axis, and the optical imaging lens satisfies the following condition: AAG / (T4+T6)≦1.

300.

16. An optical imaging lens as claimed in claim 1, claim 2, or claim 3, wherein TTL is the distance on the optical axis from the object side of the first lens to an imaging surface, ALT46 is the sum of the three thicknesses of the fourth to sixth lenses on the optical axis, and the optical imaging lens satisfies the following condition: TTL / ALT46 ≤ 3.

200.

17. An optical imaging lens as claimed in claim 1, claim 2, or claim 3, wherein T1 is the thickness of the first lens on the optical axis, G45 is the air gap between the fourth and fifth lenses on the optical axis, G56 is the air gap between the fifth and sixth lenses on the optical axis, and the optical imaging lens satisfies the following condition: (T1+G45+G56) / T6≦2.

100.

18. An optical imaging lens as described in claim 1, claim 2 or claim 3, and satisfying the following condition: AAG / T6 ≤ 1.

300.

19. An optical imaging lens as claimed in claim 1, claim 2, or claim 3, wherein HFOV is the half-angle of the optical imaging lens, and AAGF is the distance on the optical axis from the object side of the first lens to the object side of the second lens, and the optical imaging lens satisfies the following condition: 85.000∘ / mm ≤ HFOV / AAGF.

20. An optical imaging lens as described in claim 1, claim 2 or claim 3, wherein ImgH is the image height of the optical imaging lens, EFL is the system focal length of the optical imaging lens, and the optical imaging lens satisfies the following condition: 1.000 ≤ ImgH / EFL.

Images