Optical imaging lens

Abstract

The present application provides an optical imaging lens, which comprises, in order from the object side to the image side along the optical axis, an aperture, a front lens group and a rear lens group. The first lens from the object side of the front lens group is a first lens, and the second lens is a second lens. The first lens has a positive refractive power, and the optical axis area of the object side surface of the second lens is convex, or the circumferential area thereof is convex. The optical imaging lens has only five lenses, the rear lens group makes the optical imaging lens form a first focusing state and a second focusing state, EFL is the effective focal length of the first focusing state, EFLA is the effective focal length of the second focusing state, and EFL / EFLA≧1.200 is satisfied.

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 videos, and can be applied to, for example, mobile phones, cameras, tablet computers, or intelligent electronic products such as automotive devices and head-mounted displays (AR, VR, MR). Background Technology

[0002] In recent years, optical imaging lenses have continued to evolve, and their applications have become more extensive. In addition to the requirement for small lens size, the demand for recording electronic products is also increasing.

[0003] However, when a shooting system consists of multiple lenses with different functions, and is further processed by software, the arrangement of multiple lenses takes up a lot of space. Therefore, how to design a lens that can meet different shooting needs with a single lens, which is both thin and compact, has an infinity focus distance, and can also focus at macro distances, has become a pressing problem to be solved. Summary of the Invention

[0004] Therefore, various embodiments of the present invention provide an optical imaging lens that is small in size, has focusing function, excellent image quality, good optical performance, and is technically feasible. The optical imaging lens of the present invention comprises a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially along the optical axis from the object side to the image side. Each of the first, second, third, fourth, and fifth 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. The air gap distance between the first, second, third, fourth, or fifth lens may be variable.

[0005] In one embodiment of the present invention, the optical imaging lens sequentially comprises an aperture, a front lens group, and a rear lens group along the optical axis from the object side to the image side. The front lens group comprises at least two lenses. The first lens in the front lens group counting from the object side is the first lens, which has a positive refractive index. The second lens in the front lens group counting from the object side is the second lens, and the optical axis region of the object side of the second lens is convex, or its circumferential region is convex. The rear lens group comprises at least one lens, and the first lens in the rear lens group counting from the image side is the fifth lens. The optical imaging lens has only five lenses. The rear lens group moves along the optical axis to enable the optical imaging lens to form a first focusing state and a second focusing state, where EFL is the effective focal length in the first focusing state and EFLA is the effective focal length in the second focusing state, and satisfies the following condition: EFL / EFLA ≥ 1.200.

[0006] In another embodiment of the invention, a front lens group and a rear lens group are sequentially included along the optical axis from the object side to the image side. The front lens group includes at least three lenses. The first lens in the front lens group, counting from the object side, is the first lens, and the first lens has a positive refractive index. The second lens in the front lens group, counting from the object side, is the second lens, and the optical axis region of the second lens on the object side is convex, or its circumferential region is convex. The third lens in the front lens group, counting from the object side, is the third lens, and the third lens has a positive refractive index. The rear lens group includes at least one lens, and the first lens in the rear lens group, counting from the image side, is the fifth lens, and the fifth lens has a negative refractive index. The optical imaging lens has only five lenses. Moving the rear lens group along the optical axis causes the optical imaging lens to form a first focusing state and a second focusing state. EFL is the effective focal length in the first focusing state, and EFLA is the effective focal length in the second focusing state, and they satisfy the following condition: EFL / EFLA ≥ 1.200.

[0007] In another embodiment of the invention, a front lens group and a rear lens group are sequentially included along the optical axis from the object side to the image side. The front lens group includes at least three lenses. The first lens in the front lens group, counting from the object side, is a first lens, and the first lens has a positive refractive index. The second lens in the front lens group, counting from the object side, is a second lens, and the optical axis region of the object side of the second lens is convex, or its circumferential region is convex. The third lens in the front lens group, counting from the object side, is a third lens, and the optical axis region of the object side of the third lens is convex. The rear lens group includes at least one lens. The first lens in the rear lens group, counting from the image side, is a fifth lens, and the fifth lens has a negative refractive index. The optical imaging lens has only five lenses. Moving the rear lens group along the optical axis causes the optical imaging lens to form a first focusing state and a second focusing state. EFL is the effective focal length in the first focusing state, and EFLA is the effective focal length in the second focusing state, and they satisfy the following condition: EFL / EFLA ≥ 1.200.

[0008] In the optical imaging lens of the present invention, the following conditions may also be selectively satisfied in various embodiments:

[0009] υ2+υ3+υ4≦120.000;

[0010] TTL / (T1+G45)≦8.100;

[0011] AAG / T1≦2.600;

[0012] ΔHFOV*TTL / ALT≦2.200 degrees;

[0013] T3 / (G12+T2)≧2.400;

[0014] TL / BFL ≤ 3.100;

[0015] υ1 + υ3 + υ5 ≥ 145.000;

[0016] TTL / (T3 + T5) ≤ 5.800;

[0017] (G23 + T4 + G45) / T1 ≤ 1.300;

[0018] ALT / ΔHFOV ≥ 5.000 mm / degree;

[0019] (T3 + G34 + T4) / (G12 + G23) ≥ 5.000;

[0020] T3 / T4 ≥ 1.600;

[0021] (υ1 + υ5) / (υ2 + υ4) ≥ 1.700;

[0022] TL / (G34 + T5) ≤ 4.600;

[0023] (AAG + BFL) / ALT ≤ 1.900;

[0024] ALT / ΔG ≥ 1.900;

[0025] (T1 + T3 + T5) / (G12 + T2 + G23) ≥ 3.000;

[0026] (f1 + f2) / f5 ≤ 0.000;

[0027] (f2 + f3) / f4 ≥ -0.200;

[0028] f2 / f3 ≥ -2.200;

[0029] f2 / f4 ≤ 0.500;

[0030] (f2 + f3) / f5 ≤ 0.750;

[0031] ALT / Tmax ≥ 2.600;

[0032] TTL / Tavg ≤ 15.000;

[0033] Tmax / Tmin ≥ 2.500.

[0034] Where T1 is defined as the thickness of the first lens on the optical axis; T2 is defined as the thickness of the second lens on the optical axis; T3 is defined as the thickness of the third lens on the optical axis; T4 is defined as the thickness of the fourth lens on the optical axis; and T5 is defined as the thickness of the fifth lens on the optical axis. G12 is defined as the air gap between the first and second lenses on the optical axis; G23 is defined as the air gap between the second and third lenses on the optical axis; G34 is defined as the air gap between the third and fourth lenses on the optical axis; and G45 is defined as the air gap between the fourth and fifth lenses on the optical axis. f1 is defined as the focal length of the first lens; f2 is defined as the focal length of the second lens; f3 is defined as the focal length of the third lens; f4 is defined as the focal length of the fourth lens; and f5 is defined as the focal length of the fifth lens. AAG is defined as the sum of the four air gaps on the optical axis from the first to the fifth lens; ΔG is defined as the absolute value of the change between the sum of the air gaps AAG1 in the first focusing state and the sum of the air gaps AAG2 in the second focusing state, i.e., ΔG=|AAG1-AAG2|.

[0035] Redefining: υ1 is defined as the Abbe number of the first lens; υ2 is defined as the Abbe number of the second lens; υ3 is defined as the Abbe number of the third lens; υ4 is defined as the Abbe number of the fourth lens; and υ5 is defined as the Abbe number of the fifth lens. ALT is defined as the sum of the thicknesses of the five lenses (first to fifth) along the optical axis; Tmax is defined as the maximum thickness of the five lenses (first to fifth) along the optical axis, i.e., the maximum among T1, T2, T3, T4, and T5; Tmin is defined as the minimum thickness of the five lenses (first to fifth) along the optical axis, i.e., the minimum among T1, T2, T3, T4, and T5; Tavg is defined as the average thickness of the five lenses (first to fifth) along the optical axis, i.e., Tavg = ALT / 5; TL is defined as the distance along the optical axis from the object side of the first lens to the image side of the fifth lens; TTL is defined as the distance along the optical axis from the object side of the first lens to the imaging plane; BFL is defined as the distance along the optical axis from the image side of the fifth lens to the imaging plane; EFL is defined as the effective focal length in the first focusing state; EFLA is defined as the effective focal length in the second focusing state; HFOV is defined as the half-angle of the optical imaging lens; ΔHFOV is defined as the absolute value of the change in half-angle of the optical imaging lens between the first and second focusing states. Attached Figure Description

[0036] To better understand the embodiments described in this specification, please refer to the following figures:

[0037] Figures 1 to 5 A schematic diagram illustrating the method for determining the curvature shape of the optical imaging lens of the present invention is shown.

[0038] Figure 6A schematic diagram illustrating a first embodiment of the optical imaging lens of the present invention is shown.

[0039] Figure 7 Figure A illustrates the longitudinal spherical aberration on the imaging plane in the first focusing state of the first embodiment.

[0040] Figure 7 Figure B illustrates the field curvature aberration in the sagittal direction of the first focusing state of the first embodiment.

[0041] Figure 7 The diagram C illustrates the field curvature aberration in the meridional direction of the first focusing state of the first embodiment.

[0042] Figure 7 The diagram D illustrates the distortion aberrations of the first focus state in the first embodiment.

[0043] Figure 7 E illustrates the longitudinal spherical aberration on the imaging plane in the second focusing state of the first embodiment.

[0044] Figure 7 F illustrates the field curvature aberration in the sagittal direction of the second focusing state of the first embodiment.

[0045] Figure 7 The G diagram illustrates the field curvature aberration in the meridional direction of the second focus state of the first embodiment.

[0046] Figure 7 H illustrates the distortion aberration of the second focus state in the first embodiment.

[0047] Figure 8 A schematic diagram illustrating a second embodiment of the optical imaging lens of the present invention is shown.

[0048] Figure 9 Figure A illustrates the longitudinal spherical aberration on the imaging plane in the first focusing state of the second embodiment.

[0049] Figure 9 Figure B illustrates the field curvature aberration in the sagittal direction of the first focusing state in the second embodiment.

[0050] Figure 9 The diagram C illustrates the field curvature aberration in the meridional direction of the first focusing state of the second embodiment.

[0051] Figure 9 The diagram D illustrates the distortion aberrations of the first focus state in the second embodiment.

[0052] Figure 9 E illustrates the longitudinal spherical aberration on the imaging plane in the second focusing state of the second embodiment.

[0053] Figure 9 F illustrates the field curvature aberration in the sagittal direction of the second focusing state in the second embodiment.

[0054] Figure 9 The G diagram illustrates the field curvature aberration in the meridional direction of the second focus state in the second embodiment.

[0055] Figure 9 H illustrates the distortion aberration of the second focus state in the second embodiment.

[0056] Figure 10 A schematic diagram illustrating a third embodiment of the optical imaging lens of the present invention is shown.

[0057] Figure 11 Figure A illustrates the longitudinal spherical aberration on the imaging plane in the first focusing state of the third embodiment.

[0058] Figure 11 Figure B illustrates the field curvature aberration in the sagittal direction of the first focusing state in the third embodiment.

[0059] Figure 11 The diagram C illustrates the field curvature aberration in the meridional direction of the first focusing state in the third embodiment.

[0060] Figure 11 The diagram D illustrates the distortion aberrations of the first focus state in the third embodiment.

[0061] Figure 11 E illustrates the longitudinal spherical aberration on the imaging plane in the second focusing state of the third embodiment.

[0062] Figure 11 F illustrates the field curvature aberration in the sagittal direction of the second focusing state in the third embodiment.

[0063] Figure 11 The G diagram illustrates the field curvature aberration in the meridional direction of the second focus state in the third embodiment.

[0064] Figure 11 H illustrates the distortion aberration of the second focus state in the third embodiment.

[0065] Figure 12 A schematic diagram illustrating a fourth embodiment of the optical imaging lens of the present invention is shown.

[0066] Figure 13 Figure A illustrates the longitudinal spherical aberration on the imaging plane in the first focusing state of the fourth embodiment.

[0067] Figure 13 Figure B illustrates the field curvature aberration in the sagittal direction of the first focusing state in the fourth embodiment.

[0068] Figure 13 The diagram C illustrates the field curvature aberration in the meridional direction of the first focusing state in the fourth embodiment.

[0069] Figure 13The diagram D illustrates the distortion aberrations of the first focus state in the fourth embodiment.

[0070] Figure 13 The diagram E illustrates the longitudinal spherical aberration on the imaging plane in the second focusing state of the fourth embodiment.

[0071] Figure 13 F illustrates the field curvature aberration in the sagittal direction of the second focusing state in the fourth embodiment.

[0072] Figure 13 The G diagram illustrates the field curvature aberration in the meridional direction of the second focus state in the fourth embodiment.

[0073] Figure 13 H illustrates the distortion aberration of the second focus state in the fourth embodiment.

[0074] Figure 14 A schematic diagram illustrating a fifth embodiment of the optical imaging lens of the present invention is shown.

[0075] Figure 15 Figure A illustrates the longitudinal spherical aberration on the imaging plane in the first focusing state of the fifth embodiment.

[0076] Figure 15 Figure B illustrates the field curvature aberration in the sagittal direction of the first focusing state in the fifth embodiment.

[0077] Figure 15 The diagram C illustrates the field curvature aberration in the meridional direction of the first focusing state in the fifth embodiment.

[0078] Figure 15 The diagram shows the distortion aberrations of the first focus state in the fifth embodiment.

[0079] Figure 15 The diagram E illustrates the longitudinal spherical aberration on the imaging plane in the second focusing state of the fifth embodiment.

[0080] Figure 15 F illustrates the field curvature aberration in the sagittal direction of the second focusing state in the fifth embodiment.

[0081] Figure 15 The G diagram illustrates the field curvature aberration in the meridional direction of the second focus state in the fifth embodiment.

[0082] Figure 15 H illustrates the distortion aberration of the second focus state in the fifth embodiment.

[0083] Figure 16 A schematic diagram illustrating a sixth embodiment of the optical imaging lens of the present invention is shown.

[0084] Figure 17 Figure A illustrates the longitudinal spherical aberration on the imaging plane in the first focusing state of the sixth embodiment.

[0085] Figure 17 The diagram B illustrates the field curvature aberration in the sagittal direction of the first focusing state in the sixth embodiment.

[0086] Figure 17 The diagram C illustrates the field curvature aberration in the meridional direction of the first focusing state in the sixth embodiment.

[0087] Figure 17 The diagram shows the distortion aberrations of the first focusing state in the sixth embodiment.

[0088] Figure 17 The diagram E illustrates the longitudinal spherical aberration on the imaging plane in the second focusing state of the sixth embodiment.

[0089] Figure 17 F illustrates the field curvature aberration in the sagittal direction of the second focusing state in the sixth embodiment.

[0090] Figure 17 The G diagram illustrates the field curvature aberration in the meridional direction of the second focus state in the sixth embodiment.

[0091] Figure 17 H illustrates the distortion aberration of the second focus state in the sixth embodiment.

[0092] Figure 18 A schematic diagram illustrating a seventh embodiment of the optical imaging lens of the present invention is shown.

[0093] Figure 19 Figure A illustrates the longitudinal spherical aberration on the imaging plane in the first focusing state of the seventh embodiment.

[0094] Figure 19 Figure B illustrates the field curvature aberration in the sagittal direction of the first focusing state in the seventh embodiment.

[0095] Figure 19 The diagram C illustrates the field curvature aberration in the meridional direction of the first focusing state in the seventh embodiment.

[0096] Figure 19 The diagram shows the distortion aberrations of the first focus state in the seventh embodiment.

[0097] Figure 19 The diagram E illustrates the longitudinal spherical aberration on the imaging plane in the second focusing state of the seventh embodiment.

[0098] Figure 19 F illustrates the field curvature aberration in the sagittal direction of the second focusing state in the seventh embodiment.

[0099] Figure 19 The G diagram illustrates the field curvature aberration in the meridional direction of the second focus state in the seventh embodiment.

[0100] Figure 19H illustrates the distortion aberration of the second focus state in the seventh embodiment.

[0101] Figure 20 A schematic diagram illustrating an eighth embodiment of the optical imaging lens of the present invention is shown.

[0102] Figure 21 Figure A illustrates the longitudinal spherical aberration on the imaging plane in the first focusing state of the eighth embodiment.

[0103] Figure 21 Figure B illustrates the field curvature aberration in the sagittal direction of the first focusing state in the eighth embodiment.

[0104] Figure 21 The diagram C illustrates the field curvature aberration in the meridional direction of the first focusing state in the eighth embodiment.

[0105] Figure 21 The diagram shows the distortion aberrations of the first focus state in the eighth embodiment.

[0106] Figure 21 The figure E illustrates the longitudinal spherical aberration on the imaging plane in the second focusing state of the eighth embodiment.

[0107] Figure 21 F illustrates the field curvature aberration in the sagittal direction of the second focusing state in the eighth embodiment.

[0108] Figure 21 The G diagram illustrates the field curvature aberration in the meridional direction of the second focus state in the eighth embodiment.

[0109] Figure 21 H illustrates the distortion aberration of the second focus state in the eighth embodiment.

[0110] Figure 22 A detailed optical data table diagram showing the first embodiment.

[0111] Figure 23 A detailed table of aspherical data for the first embodiment is shown.

[0112] Figure 24 A detailed optical data table diagram showing the second embodiment.

[0113] Figure 25 A detailed table of aspherical data for the second embodiment is shown.

[0114] Figure 26 A table diagram showing detailed optical data for the third embodiment.

[0115] Figure 27 A detailed table of aspherical data for the third embodiment is shown.

[0116] Figure 28A table diagram showing detailed optical data for the fourth embodiment.

[0117] Figure 29 A detailed table of aspherical data for the fourth embodiment is shown.

[0118] Figure 30 A detailed optical data table diagram showing the fifth embodiment.

[0119] Figure 31 A detailed table of aspherical data for the fifth embodiment is shown.

[0120] Figure 32 A detailed optical data table diagram showing the sixth embodiment.

[0121] Figure 33 A detailed table of aspherical data for the sixth embodiment is shown.

[0122] Figure 34 A table diagram showing detailed optical data for the seventh embodiment.

[0123] Figure 35 A detailed table of aspherical data for the seventh embodiment is shown.

[0124] Figure 36 A table diagram showing detailed optical data for the eighth embodiment.

[0125] Figure 37 A detailed table of aspherical data for the eighth embodiment is shown.

[0126] Figure 38 A table of key parameters for the first focusing state of each embodiment is shown.

[0127] Figure 39 A table of key parameters for the second focus state of each embodiment is shown.

[0128] Figure 40 A table of key parameters for the first focusing state of each embodiment is shown.

[0129] Figure 41 A table of key parameters for the second focus state of each embodiment is shown. Detailed Implementation

[0130] Before describing the invention in detail, the symbols in the accompanying drawings are clearly explained: 1…optical imaging lens; 2…aperture; 3…filter; 4…imaging plane; A1…object side; A2…image side; I…optical axis; 11, 21, 31, 41, 51…object side; 12, 22, 32, 42, 52…image side; Z1, 13, 16, 23, 26, 33, 36, 43, 46, 53, 56…optical axis region; Z2, 14, 17, 24, 27, 34, 37, 44, 47, 54, 57…circumferential region; CP…center Center point; CP1…First center point; CP2…Second center point; OB…Optical boundary; Lc…Primary ray; Lm…Edge ray; TP1…First conversion point; TP2…Second conversion point; Z3…Relay region; EL…Extension line; M, R…Intersection point; 10…First lens; 20…Second lens; 30…Third lens; 40…Fourth lens; 50…Fifth lens; 81…Front lens group; 82…Rear lens group; 100, 200, 300, 400, 500…Lens; 130…Assembly section; 211, 212…Parallel rays.

[0131] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of this invention and are primarily used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. The elements in the drawings are not drawn to scale, and similar element symbols are generally used to represent similar elements.

[0132] 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.

[0133] 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 refractive index (or 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) (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.

[0134] 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).

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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" as described in this specification may be used interchangeably.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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 between the optical axis I and the optical boundary OB of the lens 500 surface measured from the optical axis I. 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.

[0146] 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 five lenses, which sequentially include an aperture 2, a front lens group 81, a rear lens group 82, and an image plane 4. In one embodiment of the present invention, the front lens group 81 may include at least two lenses. Alternatively, in another embodiment of the present invention, the front lens group 81 may include at least three lenses. The first lens in the front lens group 81 counting from the object side A1 is the first lens 10, the second lens in the front lens group 81 counting from the object side A1 is the second lens 20, and the third lens in the front lens group 81 counting from the object side A1 is the third lens 30. For example, in one embodiment of the present invention, the front lens group 81 may include the first lens 10 and the second lens 20. Alternatively, in another embodiment of the present invention, the front lens group 81 may include the first lens 10, the second lens 20, and the third lens 30, but the present invention is not limited thereto. In another embodiment of the invention, the rear lens group 82 may include at least one lens. For example, the first lens in the rear lens group 82 counting from the image side A2 is the fifth lens 50, but the invention is not limited thereto.

[0147] The rear lens group 82 can move along the optical axis I, allowing the optical imaging lens 1 to achieve different focusing states, such as different first focusing states or second focusing states. The first focusing state and the second focusing state can be one where the object distance is infinity and the object distance is finite, respectively. In one embodiment of the present invention, the first focusing state can be where the object distance is infinity. Alternatively, in another embodiment of the present invention, the second focusing state can be where the object distance is finite, such as a macro state, but the present invention is not limited thereto.

[0148] Generally speaking, the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, and the fifth lens 50 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 five lenses with refractive indices: the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, and the fifth lens 50. 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.

[0149] In addition, 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 first lens 10 facing the object side A1, that is, between the object side A1 and the first lens 10. 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 aperture 2, the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, 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 fifth lens 50 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.

[0150] 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; and the fifth lens 50 has an object-side surface 51 and an image-side surface 52. Each object-side surface and each image-side surface also has an optical axis region and a circumferential region.

[0151] 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, and the fifth lens 50 has a fifth lens thickness T5. ALT is the sum of the thicknesses of the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, and the fifth lens 50 on the optical axis I. That is, ALT = T1 + T2 + T3 + T4 + T5. Tmax is the maximum value of the five lens thicknesses of the first lens 10 to the fifth lens 50 on the optical axis I, that is, the maximum value among T1, T2, T3, T4, and T5. Tmin is the minimum value of the five lens thicknesses of the first lens 10 to the fifth lens 50 on the optical axis I, that is, the minimum value among T1, T2, T3, T4, and T5. Tavg is the average thickness of the five lenses from the first lens 10 to the fifth lens 50 along the optical axis I. That is, Tavg = ALT / 5.

[0152] Furthermore, in the optical imaging lens 1 of the present invention, each lens has an air gap distance located on the optical axis I. The optical imaging lens 1 of the present invention is designed as a focusing lens, so the air gap distances between the lenses may be variable. 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, and the air gap between the fourth lens 40 and the fifth lens 50 is called G45. Therefore, the sum of the distances of the four air gaps between the lenses located on the optical axis I from the first lens 10 to the fifth lens 50 is called AAG. That is, AAG = G12 + G23 + G34 + G45. AAG1 is the sum of the distances of the air gaps on the optical axis I when the optical imaging lens 1 is in the first focusing state; AAG2 is the sum of the distances of the air gaps on the optical axis I when the optical imaging lens 1 is in the second focusing state; ΔG is the absolute value of the change in the sum of the distances of the air gaps between the first focusing state and the second focusing state, that is, ΔG=|AAG1-AAG2|.

[0153] The distance from the object-side surface 11 of the first lens 10 to the image surface 4 on the optical axis I is the system length TTL of the optical imaging lens 1. The distance from the object-side surface 11 of the first lens 10 to the image-side surface 52 of the fifth lens 50 on the optical axis I is TL. ImgH (image height) is the image height of the optical imaging lens 1, and Fno is the aperture value of the optical imaging lens 1. When the rear lens group 82 in the optical imaging lens 1 moves along the optical axis I, the effective focal length of the first focusing state formed by the optical imaging lens 1 is EFL, and the effective focal length of the second focusing state formed by the optical imaging lens 1 is EFLA. HFOV is the half-angle of the optical imaging lens 1, that is, half of the maximum field of view, and ΔHFOV is the absolute value of the change in the half-angle of the optical imaging lens 1 in the first focusing state and the second focusing state.

[0154] When filter 3 is positioned between the fifth lens 50 and the imaging surface 4, G5F represents the air gap between the fifth lens 50 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 surface 52 of the fifth lens 50 and the imaging surface 4 on the optical axis I, i.e., BFL = G5F + TF + GFP.

[0155] 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; fG1 is the focal length of the front lens group 81; fG2 is the focal length of the rear lens group 82; n1 is the refractive index of the first lens 10; n2 is the refractive index of the second lens 20; n3 is the refractive index of the third lens 30; n4 is the refractive index of the fourth lens 40; n5 is the refractive index of the fifth lens 50; υ1 is the Abbe number of the first lens 10; υ2 is the Abbe number of the second lens 20; υ3 is the Abbe number of the third lens 30; υ4 is the Abbe number of the fourth lens 40; and υ5 is the Abbe number of the fifth lens 50.

[0156] First Embodiment

[0157] 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 focusing state of the first embodiment, please refer to... Figure 7 For A, the field curvature aberration in the sagittal direction during the first focusing state, please refer to [reference needed]. Figure 7 For B, the field curvature aberration in the tangential direction of the first focusing state, please refer to [reference needed].Figure 7 C. Distortion aberration in the first focusing state (please refer to...) Figure 7 For D, the longitudinal spherical aberration on image plane 4 in the second focusing state, please refer to... Figure 7 For the field curvature aberration in the sagittal direction of E and the second focusing state, please refer to [reference needed]. Figure 7 For the field curvature aberrations in the meridional direction of the F-axis and the second focusing state, please refer to [reference needed]. Figure 7 For G and distortion aberrations in the second focusing state, please refer to Figure 7 H. In all embodiments, the Y-axis of each spherical aberration map represents the field of view, and its highest point is 1.0. In the embodiments, the Y-axis of each aberration map and distortion map represents the image height. The image height (ImgH) of the first embodiment is 3.500 mm.

[0158] The optical imaging lens 1 of the first embodiment mainly consists of an aperture 2, a front lens group 81, a rear lens group 82, and an imaging plane 4. In the first embodiment, the aperture 2 is located on the side of the first lens 10 in the front lens group 81 facing the object side A1. The front lens group 81 and the rear lens group 82 contain a total of five lenses with refractive indices: the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, and the fifth lens 50. Specifically, the front lens group 81 includes the first lens 10, the second lens 20, and the third lens 30, while the rear lens group 82 includes the fourth lens 40 and the fifth lens 50.

[0159] The first lens 10 has a positive refractive index. The optical axis region 13 of the object-side surface 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 surface 12 of the first lens 10 is concave, and its circumferential region 17 is also concave. Both the object-side surface 11 and the image-side surface 12 of the first lens 10 are aspherical, but this is not a limitation.

[0160] The second lens 20 has a negative 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 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.

[0161] The third lens 30 has a positive refractive index. The optical axis region 33 of the object-side surface 31 of the third lens 30 is convex and its circumferential region 34 is concave. The optical axis region 36 of the image-side surface 32 of the third lens 30 is convex and its circumferential region 37 is 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.

[0162] The fourth lens 40 has a negative refractive index. The optical axis region 43 of the object-side surface 41 of the fourth lens 40 is concave and its circumferential region 44 is convex. The optical axis region 46 of the image-side surface 42 of the fourth lens 40 is convex and its circumferential region 47 is 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.

[0163] The fifth lens 50 has a negative refractive index. The optical axis region 53 of the object-side surface 51 of the fifth lens 50 is convex, and its circumferential region 54 is concave. The optical axis region 56 of the image-side surface 52 of the fifth lens 50 is concave, and its circumferential region 57 is concave. 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.

[0164] In the optical imaging lens 1 of the present invention, all ten surfaces—object side 11 / 21 / 31 / 41 / 51 and image side 12 / 22 / 32 / 42 / 52—from the first lens 10 to the fifth lens 50 are aspherical, but not limited to this. If they are aspherical, these aspherical surfaces are defined by the following formula:

[0165]

[0166] in:

[0167] Y represents the perpendicular distance between a point on the aspherical surface and the optical axis I;

[0168] 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 that is tangent to the vertex on the optical axis I of the aspherical surface).

[0169] R represents the radius of curvature of the lens surface near the optical axis I;

[0170] K is the conic constant;

[0171] a i Let a be the i-th order aspherical coefficient, where the a2 coefficient in each embodiment is 0.

[0172] The optical data of the optical imaging lens 1 system in the first embodiment are as follows: Figure 22 As shown, the aspherical data is as follows Figure 23As shown. In the optical imaging lens 1 system of the following embodiment, the aperture value (f-number) of the overall optical imaging lens 1 is Fno, the effective focal length in the first focusing state is EFL, the effective focal length in the second focusing state is EFLA, and the half field of view (HFOV) is half of the maximum field of view in the overall optical imaging lens 1. The units for image height, radius of curvature, thickness, and focal length of the optical imaging lens 1 are all millimeters (mm). In this embodiment, EFL = 9.638 mm; EFLA = 7.649 mm; Fno = 3.070 in the first focusing state; Fno = 2.436 in the second focusing state; HFOV = 19.975 degrees in the first focusing state; HFOV = 20.191 degrees in the second focusing state; focal length of front lens group 81 = 6.180 mm; focal length of rear lens group 82 = -9.216 mm; TTL = 12.330 mm; image height = 3.500 mm.

[0173] Second Embodiment

[0174] Please see Figure 8 This 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 simplicity and clarity in 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 first focusing state of the second embodiment, please refer to... Figure 9 For A, the field curvature aberration in the sagittal direction of the first focusing state, please refer to [reference needed]. Figure 9 For B, please refer to the field curvature aberration in the meridional direction during the first focusing state. Figure 9 C. For distortion and aberration in the first focusing state, please refer to [reference needed]. Figure 9 For D, the longitudinal spherical aberration on image plane 4 in the second focusing state, please refer to... Figure 9 For the field curvature aberration in the sagittal direction of E and the second focusing state, please refer to [reference needed]. Figure 9 For the field curvature aberrations in the meridional direction of the F-axis and the second focusing state, please refer to [reference needed]. Figure 9 For G and distortion aberrations in the second focusing state, please refer to Figure 9 The design of the second embodiment is similar to that of the first embodiment, except that the only differences are in related parameters such as lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, or back focal length. Furthermore, in this embodiment, the circumferential region 34 of the object-side surface 31 of the third lens 30 is convex, the fourth lens 40 has a positive refractive index, and the optical axis region 53 of the object-side surface 51 of the fifth lens 50 is concave.

[0175] Detailed optical data for the second embodiment are as follows:Figure 24 As shown, the aspherical data is as follows Figure 25 As shown. In this embodiment, EFL = 13.896 mm; EFLA = 9.379 mm; Fno = 3.070 in the first focusing state; Fno = 2.141 in the second focusing state; HFOV = 14.025 degrees in the first focusing state; HFOV = 13.705 degrees in the second focusing state; focal length of front lens group 81 = 8.015 mm; focal length of rear lens group 82 = -8.702 mm; TTL = 15.253 mm; image height = 3.500 mm. In particular, the field curvature aberration in the meridional direction of the second focusing state in this embodiment is better than that in the meridional direction of the second focusing state in the first embodiment.

[0176] Third Embodiment

[0177] Please see Figure 10 This illustrates a third embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 4 in the first focusing state of the third embodiment, please refer to... Figure 11 For A, the field curvature aberration in the sagittal direction of the first focusing state, please refer to [reference needed]. Figure 11 For B, please refer to the field curvature aberration in the meridional direction during the first focusing state. Figure 11 C. For distortion and aberration in the first focusing state, please refer to [reference needed]. Figure 11 For D, the longitudinal spherical aberration on image plane 4 in the second focusing state, please refer to... Figure 11 For the field curvature aberration in the sagittal direction of E and the second focusing state, please refer to [reference needed]. Figure 11 For the field curvature aberrations in the meridional direction of the F-axis and the second focusing state, please refer to [reference needed]. Figure 11 For G and distortion aberrations in the second focusing state, please refer to Figure 11 The design of the third embodiment is similar to that of the first embodiment, except that the only differences are in related parameters such as lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, or back focal length. Furthermore, in this embodiment, the circumferential region 34 of the object-side surface 31 of the third lens 30 is convex, the fourth lens 40 has a positive refractive index, and the optical axis region 53 of the object-side surface 51 of the fifth lens 50 is concave.

[0178] Detailed optical data for the third embodiment are as follows: Figure 26 As shown, the aspherical data is as follows Figure 27As shown, in this embodiment, EFL = 14.500 mm; EFLA = 9.521 mm; Fno = 3.070 in the first focusing state; Fno = 2.125 in the second focusing state; HFOV = 13.379 degrees in the first focusing state; HFOV = 12.435 degrees in the second focusing state; focal length of front lens group 81 = 8.973 mm; focal length of rear lens group 82 = -11.480 mm; TTL = 15.455 mm; image height = 3.500 mm. In particular, the field curvature aberration in the sagittal direction of the first focusing state in this embodiment is superior to that of the first focusing state in the first embodiment.

[0179] Fourth embodiment

[0180] 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 first focusing state of the fourth embodiment, please refer to... Figure 13 For A, the field curvature aberration in the sagittal direction of the first focusing state, please refer to [reference needed]. Figure 13 For B, please refer to the field curvature aberration in the meridional direction during the first focusing state. Figure 13 C. For distortion and aberration in the first focusing state, please refer to [reference needed]. Figure 13 For D, the longitudinal spherical aberration on image plane 4 in the second focusing state, please refer to... Figure 13 For the field curvature aberration in the sagittal direction of E and the second focusing state, please refer to [reference needed]. Figure 13 For the field curvature aberrations in the meridional direction of the F-axis and the second focusing state, please refer to [reference needed]. Figure 13 For G and distortion aberrations in the second focusing state, please refer to Figure 13 The design of the fourth embodiment is similar to that of the first embodiment, except that the only differences are in related parameters such as lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, or back focal length. Furthermore, in this embodiment, the circumferential region 34 of the object-side surface 31 of the third lens 30 is convex, the fourth lens 40 has positive refractive index, the optical axis region 53 of the object-side surface 51 of the fifth lens 50 is concave, and the circumferential region 57 of the image-side surface 52 of the fifth lens 50 is convex.

[0181] Detailed optical data for the fourth embodiment are as follows: Figure 28 As shown, the aspherical data is as follows Figure 29As shown. In this embodiment, EFL = 13.846 mm; EFLA = 9.271 mm; Fno = 3.070 in the first focusing state; Fno = 2.088 in the second focusing state; HFOV = 14.073 degrees in the first focusing state; HFOV = 13.611 degrees in the second focusing state; focal length of front lens group 81 = 7.913 mm; focal length of rear lens group 82 = -8.304 mm; TTL = 14.999 mm; image height = 3.500 mm. In particular, the field curvature aberration in the sagittal direction of the first focusing state in this embodiment is better than that of the field curvature aberration in the sagittal direction of the first focusing state in the first embodiment.

[0182] Fifth embodiment

[0183] 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 first focusing state of the fifth embodiment, please refer to... Figure 15 For A, the field curvature aberration in the sagittal direction of the first focusing state, please refer to [reference needed]. Figure 15 For B, please refer to the field curvature aberration in the meridional direction during the first focusing state. Figure 15 C. For distortion and aberration in the first focusing state, please refer to [reference needed]. Figure 15 For D, the longitudinal spherical aberration on image plane 4 in the second focusing state, please refer to... Figure 15 For the field curvature aberration in the sagittal direction of E and the second focusing state, please refer to [reference needed]. Figure 15 For the field curvature aberrations in the meridional direction of the F-axis and the second focusing state, please refer to [reference needed]. Figure 15 For G and distortion aberrations in the second focusing state, please refer to Figure 15 The design of the fifth embodiment is similar to that of the first embodiment, except that the only differences are in related parameters such as lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, or back focal length. Furthermore, in this embodiment, the optical axis region 16 of the image-side surface 12 of the first lens 10 is convex, the circumferential region 34 of the object-side surface 31 of the third lens 30 is convex, the fourth lens 40 has a positive refractive index, and the optical axis region 53 of the object-side surface 51 of the fifth lens 50 is concave.

[0184] Detailed optical data for the fifth embodiment are as follows: Figure 30 As shown, the aspherical data is as follows Figure 31As shown, in this embodiment, EFL = 14.407 mm; EFLA = 9.421 mm; Fno = 3.074 in the first focusing state; Fno = 2.093 in the second focusing state; HFOV = 13.389 degrees in the first focusing state; HFOV = 12.657 degrees in the second focusing state; focal length of front lens group 81 = 8.393 mm; focal length of rear lens group 82 = -9.112 mm; TTL = 14.911 mm; image height = 3.500 mm. In particular, the field curvature aberration in the meridional direction of the second focusing state in this embodiment is superior to that in the first embodiment.

[0185] Sixth Embodiment

[0186] 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 first focusing state of the sixth embodiment, please refer to... Figure 17 For A, the field curvature aberration in the sagittal direction of the first focusing state, please refer to [reference needed]. Figure 17 For B, please refer to the field curvature aberration in the meridional direction during the first focusing state. Figure 17 C. For distortion and aberration in the first focusing state, please refer to [reference needed]. Figure 17 For D, the longitudinal spherical aberration on image plane 4 in the second focusing state, please refer to... Figure 17 For the field curvature aberration in the sagittal direction of E and the second focusing state, please refer to [reference needed]. Figure 17 For the field curvature aberrations in the meridional direction of the F-axis and the second focusing state, please refer to [reference needed]. Figure 17 For G and distortion aberrations in the second focusing state, please refer to Figure 17 The design of the sixth embodiment is similar to that of the first embodiment, except that the only differences are in related parameters such as lens refractive index, lens radius of curvature, lens thickness, lens aspherical coefficient, or back focal length. Furthermore, in this embodiment, the fourth lens 40 has a positive refractive index, the optical axis region 53 of the object-side surface 51 of the fifth lens 50 is concave, and the circumferential region 57 of the image-side surface 52 of the fifth lens 50 is convex.

[0187] Detailed optical data for the sixth embodiment are as follows: Figure 32 As shown, the aspherical data is as follows Figure 33 As shown, in this embodiment, EFL = 14.314 mm; EFLA = 9.794 mm; Fno in the first focusing state = 3.070; Fno in the second focusing state = 2.206; HFOV in the first focusing state = 13.597 degrees; HFOV in the second focusing state = 13.179 degrees; focal length of the front lens group 81 = 8.097 mm; focal length of the rear lens group 82 = -9.154 mm; TTL = 15.041 mm; image height = 3.500 mm.

[0188] Seventh Embodiment

[0189] 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 first focusing state of the seventh embodiment, please refer to... Figure 19 For A, the field curvature aberration in the sagittal direction of the first focusing state, please refer to [reference needed]. Figure 19 For B, please refer to the field curvature aberration in the meridional direction during the first focusing state. Figure 19 C. For distortion and aberration in the first focusing state, please refer to [reference needed]. Figure 19 For D, the longitudinal spherical aberration on image plane 4 in the second focusing state, please refer to... Figure 19 For the field curvature aberration in the sagittal direction of E and the second focusing state, please refer to [reference needed]. Figure 19 For the field curvature aberrations in the meridional direction of the F-axis and the second focusing state, please refer to [reference needed]. Figure 19 For G and distortion aberrations in the second focusing state, please refer to Figure 19 The design of the seventh embodiment is similar to that of the first embodiment, except that the 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 convex, the optical axis region 53 of the object-side surface 51 of the fifth lens 50 is concave, and the circumferential region 57 of the image-side surface 52 of the fifth lens 50 is convex.

[0190] Detailed optical data for the seventh embodiment are as follows: Figure 34 As shown, the aspherical data is as follows Figure 35 As shown, in this embodiment, EFL = 15.792 mm; EFLA = 10.185 mm; Fno in the first focusing state = 3.476; Fno in the second focusing state = 2.242; HFOV in the first focusing state = 12.425 degrees; HFOV in the second focusing state = 12.019 degrees; focal length of the front lens group 81 = 8.298 mm; focal length of the rear lens group 82 = -8.148 mm; TTL = 16.291 mm; image height = 3.500 mm.

[0191] Eighth embodiment

[0192] Please see Figure 20 This illustrates an eighth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration on the imaging plane 4 in the first focusing state of the eighth embodiment, please refer to... Figure 21 For A, the field curvature aberration in the sagittal direction of the first focusing state, please refer to [reference needed]. Figure 21 For B, please refer to the field curvature aberration in the meridional direction during the first focusing state. Figure 21 C. For distortion and aberration in the first focusing state, please refer to [reference needed]. Figure 21 For D, the longitudinal spherical aberration on image plane 4 in the second focusing state, please refer to...Figure 21 For the field curvature aberration in the sagittal direction of E and the second focusing state, please refer to [reference needed]. Figure 21 For the field curvature aberrations in the meridional direction of the F-axis and the second focusing state, please refer to [reference needed]. Figure 21 For G and distortion aberrations in the second focusing state, please refer to Figure 21 The design of the eighth embodiment is similar to that of the first embodiment, except that the 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 convex, the fourth lens 40 has a positive refractive index, the optical axis region 53 of the object-side surface 51 of the fifth lens 50 is concave, and the circumferential region 57 of the image-side surface 52 of the fifth lens 50 is convex.

[0193] Detailed optical data for the eighth embodiment are as follows: Figure 36 As shown, the aspherical data is as follows Figure 37 As shown, in this embodiment, EFL = 14.395 mm; EFLA = 9.785 mm; Fno = 3.423 in the first focusing state; Fno = 2.327 in the second focusing state; HFOV = 13.652 degrees in the first focusing state; HFOV = 13.225 degrees in the second focusing state; focal length of front lens group 81 = 8.063 mm; focal length of rear lens group 82 = -8.950 mm; TTL = 15.167 mm; image height = 3.500 mm. In particular, the distortion aberration in the first focusing state of this embodiment is superior to that in the first focusing state of the first embodiment.

[0194] In addition, the key parameters of the first or second focusing state in each embodiment are respectively compiled in Figure 38 , Figure 39 , Figure 40 and Figure 41 Listed in.

[0195] Various embodiments of the present invention provide a five-element optical imaging lens that is small in size, has focusing function, excellent image quality, good optical performance, and is technically feasible. For example, by designing the lens surface shape and lens refractive index or parameters as follows, the imaging quality of the optical imaging lens 1 of the present invention can be effectively optimized, as well as the corresponding effects that can be achieved:

[0196] 1. When the aperture 2 is set on the side of the first lens 10 facing the object side A1, the first lens 10 has a positive refractive index, the optical axis region 23 of the object side surface 21 of the second lens 2 is convex, or the circumferential region 24 of the object side surface 21 of the second lens 20 is convex, it can effectively gather incident light rays from different angles and improve the edge aberration of the imaging surface. When the subject moves from infinity to macro or from macro to infinity, the rear lens group 82 moves along the optical axis I, which can make the optical imaging lens 1 of the present invention correspondingly form a first focusing state or a second focusing state to achieve the purpose of focusing. If the effective focal length of the two focusing states meets the ratio limit of EFL / EFLA≧1.200, in addition to keeping the system length of the optical imaging lens 1 constant, it can also maintain good image quality during focusing. The preferred range of EFL / EFLA is 1.200≦EFL / EFLA≦1.700.

[0197] 2. When the first lens has a positive refractive index, the optical axis region 23 of the object-side surface 21 of the second lens 2 is convex, or the circumferential region 24 of the object-side surface 21 of the second lens 20 is convex, it can effectively converge incident light rays from different angles. Combined with the fifth lens 50 having a negative refractive index, it can improve the edge aberrations of the imaging surface. When the subject moves from infinity to macro or from macro to infinity, the rear lens group 82 moves along the optical axis I, allowing the optical imaging lens 1 of the present invention to correspondingly form a first focusing state or a second focusing state to achieve focusing. When the effective focal lengths of the two focusing states satisfy the ratio limit of EFL / EFLA ≥ 1.200, in addition to keeping the system length of the optical imaging lens 1 constant, it can also maintain good image quality during focusing. The preferred range for EFL / EFLA is 1.200 ≤ EFL / EFLA ≤ 1.700. If the following conditions are further met: (a) the third lens 30 has a positive refractive index, or (b) the optical axis region 33 of the object side surface 31 of the third lens 30 is a convex surface, it is more conducive to the convergence of imaging light rays, and the system length of the imaging lens can be maintained while taking into account the imaging quality.

[0198] 3. Continuing from 1 to 2, when the front lens group 81 of the optical imaging lens 1 of the present invention has a positive refractive index and the rear lens group 82 has a negative refractive index, the light rays are converged by the positive refractive index of the front lens group 81, and the rear lens group 82 with a negative refractive index moves along the optical axis, so that the subjects at different object distances have good imaging quality.

[0199] 4. The optical imaging lens 1 of the present invention forms a first focusing state or a second focusing state, which enables the subject to be successfully focused and imaged and has good image quality when it is moved from infinity to a distance of 40 mm to 55 mm in front of the optical imaging lens 1 of the present invention.

[0200] 5. By moving the rear lens group 82, the present invention enables the optical imaging lens 1 to achieve focusing while maintaining a fixed volume.

[0201] 6. When the focal lengths of the lenses in this invention satisfy the following range or proportional relationship, the distortion and field curvature aberration of the optical imaging system can be better improved:

[0202] (f1+f2) / f5≦0.000, with a preferred limit of -0.750≦(f1+f2) / f5≦0.000;

[0203] (f2+f3) / f4≧-0.200, with a preferred limit of -0.200≦(f2+f3) / f4≦0.100;

[0204] f2 / f3 ≥ -2.200, with a preferred limit of -2.200 ≤ f2 / f3 ≤ -0.900;

[0205] f2 / f4≦0.500, with a preferred limit of -0.600≦f2 / f4≦0.500;

[0206] (f2+f3) / f5≦0.750, with a better limit of -0.100≦(f2+f3) / f5≦0.750.

[0207] 7. When the lens material meets the following limitations, it can effectively suppress chromatic aberration and spherical aberration generated during focusing at different object distances, so that the optical imaging lens 1 has good resolution under different focusing conditions.

[0208] υ2+υ3+υ4≦120.000, with a preferred limit of 75.000≦υ2+υ3+υ4≦120.000;

[0209] υ1+υ3+υ5≧145.000, and the preferred limit is 145.000≦υ1+υ3+υ5≦185.000;

[0210] (υ1+υ5) / (υ2+υ4)≧1.700, with a preferred limit of 1.700≦(υ1+υ5) / (υ2+υ4)≦2.600.

[0211] 8. When the first focusing state and the second focusing state of the optical imaging lens 1 meet the following ratio limits, it can be ensured that the optical imaging lens 1 can maintain good imaging quality in both focusing states.

[0212] ΔHFOV*TTL / ALT≦2.200 degrees, with a preferred limit of 0.400 degrees≦ΔHFOV*TTL / ALT≦2.200 degrees;

[0213] ALT / ΔHFOV ≥ 5.000 mm / degree, with a preferred limit of 6.750 mm / degree ≤ ALT / ΔHFOV ≤ 30.000 mm / degree;

[0214] ALT / ΔG ≥ 1.900, with a preferred limit of 1.900 ≤ ALT / ΔG ≤ 4.200.

[0215] 9. To ensure image quality, reduce lens size, and take into account the ease of manufacturing, the air gap between lenses or the lens thickness is appropriately shortened or maintained at a certain ratio. When the following conditional numerical limits are met, the embodiments of the present invention can have a better configuration.

[0216] TTL / (T1+G45)≦8.100, with a preferred limit of 4.500≦TTL / (T1+G45)≦8.100;

[0217] AAG / T1≦2.600, with a preferred limit of 0.450≦AAG / T1≦2.600;

[0218] T3 / (G12+T2)≧2.400, with a preferred limit of 2.400≦T3 / (G12+T2)≦5.800;

[0219] TL / BFL ≤ 3.100, with a preferred limit of 0.950 ≤ TL / BFL ≤ 3.100;

[0220] TTL / (T3+T5)≦5.800, with a preferred limit of 3.300≦TTL / (T3+T5)≦5.800;

[0221] The optimal limit is (G23+T4+G45) / T1≦1.300, with a preferred limit of 0.650≦(G23+T4+G45) / T1≦1.300.

[0222] (T3+G34+T4) / (G12+G23)≧5.000, with a preferred limit of 5.000≦(T3+G34+T4) / (G12+G23)≦15.000;

[0223] T3 / T4 ≥ 1.600, with a preferred limit of 1.600 ≤ T3 / T4 ≤ 5.000;

[0224] TL / (G34+T5)≦4.600, with a preferred limit of 1.850≦TL / (G34+T5)≦4.600;

[0225] (AAG+BFL) / ALT≦1.900, with a preferred limit of 0.950≦(AAG+BFL) / ALT≦1.900;

[0226] (T1+T3+T5) / (G12+T2+G23)≧3.000, with a preferred limit of 3.000≦(T1+T3+T5) / (G12+T2+G23)≦6.500;

[0227] ALT / Tmax ≥ 2.600, with a preferred limit of 2.600 ≤ ALT / Tmax ≤ 3.800;

[0228] TTL / Tavg≦15.000, with a preferred limit of 9.500≦TTL / Tavg≦15.000;

[0229] Tmax / Tmin ≥ 2.500, with a preferred limit of 2.500 ≤ Tmax / Tmin ≤ 7.000.

[0230] 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.

[0231] Given the unpredictability of optical system design, under the framework of this invention, meeting the above-mentioned conditions can better improve the imaging quality, reduce the size, or improve the assembly yield of this invention, thereby overcoming the shortcomings of prior art. Furthermore, the use of plastic material for the lens in the embodiments of this invention can further reduce lens weight and save costs.

[0232] 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.

[0233] The embodiments of this invention disclose optical parameters including, but not limited to, focal length, lens thickness, Abbe number, etc. 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:

[0234] (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.

[0235] (2) Comparison of optical parameters, for example: A is greater than B or A is less than B.

[0236] (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.

[0237] The ranges 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.

[0238] 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 expression. The disclosure of the embodiments of the present invention is to illustrate the specific embodiments of 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.

[0239] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be included in the scope of the present invention.

Claims

1. An optical imaging lens, comprising, sequentially along an optical axis from an object side to an image side, an aperture, a front lens group, and a rear lens group, wherein each lens in the front lens group and the rear lens group includes 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, characterized in that, The front lens group comprises at least two lenses and has a positive refractive index. The first lens in the front lens group, counting from the object side, is a first lens; The first lens has a positive refractive index; The second lens in the front lens group, counting from the object side, is a second lens; The second lens has a convex surface in one optical axis region on the side of the object, or a convex surface in one circumferential region of the object. The rear lens group comprises at least one lens and has a negative refractive index. The first lens in the rear lens group, counting from the image side, is a fifth lens; A third lens is located between the second lens and the fifth lens; The optical imaging lens has only five lenses. The rear lens group moves along the optical axis to enable the optical imaging lens to form a first focusing state and a second focusing state. EFL is an effective focal length in the first focusing state and EFLA is an effective focal length in the second focusing state, and the following condition is satisfied: EFL / EFLA≧1.

200.

2. An optical imaging lens, comprising a front lens group and a rear lens group sequentially along an optical axis from an object side to an image side, wherein each lens in the front lens group and the rear lens group includes 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, characterized in that, The front lens group comprises at least three lenses and has a positive refractive index. The first lens in the front lens group, counting from the object side, is a first lens; The first lens has a positive refractive index; The second lens in the front lens group, counting from the object side, is a second lens; The second lens has a convex surface in one optical axis region on the side of the object, or a convex surface in one circumferential region of the object. The third lens in the front lens group, counting from the object side, is a third lens; The third lens has a positive refractive index; The rear lens group comprises at least one lens and has a negative refractive index. The first lens in the rear lens group, counting from the image side, is a fifth lens; This fifth lens has a negative refractive index; The optical imaging lens has only five lenses. The rear lens group moves along the optical axis to enable the optical imaging lens to form a first focusing state and a second focusing state. EFL is an effective focal length in the first focusing state and EFLA is an effective focal length in the second focusing state, and the following condition is satisfied: EFL / EFLA≧1.

200.

3. An optical imaging lens, comprising a front lens group and a rear lens group sequentially along an optical axis from an object side to an image side, wherein each lens in the front lens group and the rear lens group includes 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, characterized in that, The front lens group comprises at least three lenses and has a positive refractive index. The first lens in the front lens group, counting from the object side, is a first lens; The first lens has a positive refractive index; The second lens in the front lens group, counting from the object side, is a second lens; The second lens has a convex surface in one optical axis region on the side of the object, or a convex surface in one circumferential region of the object. The third lens in the front lens group, counting from the object side, is a third lens; The optical axis region on the side of the third lens is convex. The rear lens group comprises at least one lens and has a negative refractive index. The first lens in the rear lens group, counting from the image side, is a fifth lens; This fifth lens has a negative refractive index; The optical imaging lens has only five lenses. The rear lens group moves along the optical axis to enable the optical imaging lens to form a first focusing state and a second focusing state. EFL is an effective focal length in the first focusing state and EFLA is an effective focal length in the second focusing state, and the following condition is satisfied: EFL / EFLA≧1.

200.

4. The optical imaging lens according to any one of claims 1-3, characterized in that, Where υ2 is defined as the Abbe number of the second lens, υ3 is defined as the Abbe number of the third lens, and υ4 is defined as the Abbe number of a fourth lens between the third lens and the fifth lens, and the optical imaging lens satisfies the following condition: υ2+υ3+υ4≦120.

000.

5. The optical imaging lens according to any one of claims 1-3, 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, T1 is defined as the thickness of the first lens on the optical axis, G45 is defined as the air gap between the fourth lens and the fifth lens on the optical axis, and the optical imaging lens satisfies the following condition: TTL / (T1+G45)≦8.

100.

6. The optical imaging lens according to any one of claims 1-3, characterized in that, Where AAG is defined as the sum of the four air gaps on the optical axis from the first lens to the fifth lens, T1 is defined as the thickness of the first lens on the optical axis, and the optical imaging lens satisfies the following condition: AAG / T1≦2.

600.

7. The optical imaging lens according to any one of claims 1-3, characterized in that, Where ΔHFOV is defined as the absolute value of a half-angle change of the optical imaging lens between the first focusing state and the second focusing state, TTL is defined as the distance from the object side of the first lens to an imaging surface on the optical axis, and ALT is defined as the sum of the thicknesses of the five lenses from the first lens to the fifth lens on the optical axis, and the optical imaging lens satisfies the following condition: ΔHFOV TTL / ALT ≦ 2.200 degrees.

8. The optical imaging lens according to any one of claims 1-3, characterized in that, Where T2 is defined as the thickness of the second lens on the optical axis, T3 is defined as the thickness of the third lens on the optical axis, G12 is defined as the air gap between the first lens and the second lens on the optical axis, and the optical imaging lens satisfies the following condition: T3 / (G12+T2)≧2.

400.

9. The optical imaging lens according to any one of claims 1-3, characterized in that, Where TL is defined as the distance on the optical axis from the object side of the first lens to the image side of the fifth lens, and BFL is defined as the distance on the optical axis from the image side of the fifth lens to an imaging surface, and the optical imaging lens satisfies the following condition: TL / BFL≦3.

100.

10. The optical imaging lens according to any one of claims 1-3, characterized in that, Where υ1 is defined as the Abbe number of the first lens, υ3 is defined as the Abbe number of the third lens, and υ5 is defined as the Abbe number of the fifth lens, and the optical imaging lens satisfies the following condition: υ1+υ3+υ5≧145.

000.

11. The optical imaging lens according to any one of claims 1-3, 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, T3 is defined as the thickness of the third lens on the optical axis, T5 is defined as the thickness of the fifth lens on the optical axis, and the optical imaging lens satisfies the following condition: TTL / (T3+T5)≦5.

800.

12. The optical imaging lens according to any one of claims 1-3, characterized in that, Where T1 is defined as the thickness of the first lens on the optical axis, T4 is defined as the thickness of a fourth lens between the third and fifth lenses on the optical axis, G23 is defined as the air gap between the second and third lenses on the optical axis, G45 is defined as the air gap between the fourth and fifth lenses on the optical axis, and the optical imaging lens satisfies the following condition: (G23+T4+G45) / T1≦1.

300.

13. The optical imaging lens according to any one of claims 1-3, characterized in that, Wherein ALT is defined as the sum of the thicknesses of the five lenses from the first lens to the fifth lens on the optical axis, ΔHFOV is defined as the absolute value of a half-angle change of the optical imaging lens in the first focusing state and the second focusing state, and the optical imaging lens satisfies the following condition: ALT / ΔHFOV ≥ 5.000 mm / degree.

14. The optical imaging lens according to any one of claims 1-3, characterized in that, Where T3 is defined as the thickness of the third lens on the optical axis, T4 is defined as the thickness of the fourth lens between the third lens and the fifth lens on the optical axis, G12 is defined as the air gap between the first lens and the second lens on the optical axis, G23 is defined as the air gap between the second lens and the third lens on the optical axis, and G34 is defined as the air gap between the third lens and the fourth lens on the optical axis, and the optical imaging lens satisfies the following condition: (T3+G34+T4) / (G12+G23)≧5.

000.

15. The optical imaging lens according to any one of claims 1-3, characterized in that, Where T3 is defined as the thickness of the third lens on the optical axis, T4 is defined as the thickness of a fourth lens between the third lens and the fifth lens on the optical axis, and the optical imaging lens satisfies the following condition: T3 / T4≧1.

600.

16. The optical imaging lens according to any one of claims 1-3, characterized in that, Where υ1 is defined as the Abbe number of the first lens, υ2 is defined as the Abbe number of the second lens, υ4 is defined as the Abbe number of a fourth lens between the third and fifth lenses, and υ5 is defined as the Abbe number of the fifth lens, and the optical imaging lens satisfies the following condition: (υ1+υ5) / (υ2+υ4)≧1.

700.

17. The optical imaging lens according to any one of claims 1-3, characterized in that, Where TL is defined as the distance on the optical axis from the object side of the first lens to the image side of the fifth lens, T5 is defined as the thickness of the fifth lens on the optical axis, G34 is defined as the air gap on the optical axis from the third lens to a fourth lens between the third lens and the fifth lens, and the optical imaging lens satisfies the following condition: TL / (G34+T5)≦4.

600.

18. The optical imaging lens according to any one of claims 1-3, characterized in that, Where AAG is defined as the sum of the four air gaps on the optical axis from the first lens to the fifth lens, BFL is defined as the distance from the image side of the fifth lens to an imaging surface on the optical axis, and ALT is defined as the sum of the thicknesses of the five lenses on the optical axis from the first lens to the fifth lens. The optical imaging lens satisfies the following condition: (AAG+BFL) / ALT≦1.

900.

19. The optical imaging lens according to any one of claims 1-3, characterized in that, Wherein ALT is defined as the sum of the thicknesses of the five lenses from the first lens to the fifth lens on the optical axis, ΔG is defined as the absolute value of the change in the sum of the air gaps of the optical imaging lens in the first focusing state and the second focusing state, and the optical imaging lens satisfies the following condition: ALT / ΔG≧1.

900.

20. The optical imaging lens according to any one of claims 1-3, characterized in that, Where T1 is defined as the thickness of the first lens on the optical axis, T2 is defined as the thickness of the second lens on the optical axis, T3 is defined as the thickness of the third lens on the optical axis, T5 is defined as the thickness of the fifth lens on the optical axis, G12 is defined as the air gap between the first lens and the second lens on the optical axis, and G23 is defined as the air gap between the second lens and the third lens on the optical axis, and the optical imaging lens satisfies the following condition: (T1+T3+T5) / (G12+T2+G23)≧3.000.

Images