Optical imaging lens

Abstract

The present invention provides an optical imaging lens comprising, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. When the subject is moved from infinity to macro distance, the optical imaging lens correspondingly forms a first focus state and a second focus state to achieve focusing. The fifth lens has a negative refractive power, an optical axis region on the object side of the fifth lens is concave, and an optical axis region on the image side of the fifth lens is also concave. The optical imaging lens comprises only five lenses and satisfies (TTL*ΔHFOV) / ΔG ≤ 19.000 degrees.

Description

Technical Field

[0001] The present invention generally relates to an optical imaging lens. More specifically, the present invention is directed to an optical imaging lens primarily used for capturing and recording images. The lens can be used in, for example, mobile phones, cameras, tablet computers, or in smart electronic products such as automotive devices and head-mounted displays (AR, VR, MR). Background Art

[0002] In recent years, optical imaging lenses have continued to evolve, with applications becoming increasingly widespread. In addition to the need for smaller lenses, the demand for recording in electronic products is also increasing.

[0003] However, when a shooting system is composed of multiple lenses with different functions and supplemented by software processing, the arrangement of multiple lenses takes up a lot of space. Therefore, how to use a single lens to meet different shooting needs and design a lens that is both light, thin, and compact, with infinite object distance and the ability to focus at macro distances has become a pressing issue. Summary of the Invention

[0004] Therefore, various embodiments of the present invention provide a compact, focusing, high-quality optical imaging lens with excellent optical performance and technical feasibility. 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 on the optical axis from the object side to the image side. The first lens, the second lens, the third lens, the fourth lens, and the fifth lens each have an object-side surface facing the object side through which imaging light passes, and an image-side surface facing the image side through which imaging light passes. When the subject moves from infinity to macro, the optical imaging lens correspondingly forms a first focus state and a second focus state to achieve focusing.

[0005] In one embodiment of the present invention, the fifth lens element has a negative refractive power, an optical axis region of the object-side surface of the fifth lens element is concave, and an optical axis region of the image-side surface of the fifth lens element is concave. The optical imaging lens comprises only five lens elements and satisfies (TTL*ΔHFOV) / ΔG ≤ 19.000 degrees, where TTL is defined as the distance from the object-side surface of the first lens element to an imaging plane on the optical axis, ΔHFOV is defined as the absolute value of the change in half the viewing angle of the optical imaging lens between a first focus state and a second focus state, and ΔG is defined as the absolute value of the change in the total air gap between the first focus state and the second focus state.

[0006] In one embodiment of the present invention, an optical axis region of the image-side surface of the third lens element is convex, the fifth lens element has a negative refractive power, and an optical axis region of the object-side surface of the fifth lens element is concave. The optical imaging lens comprises only five lens elements and satisfies (TTL*ΔHFOV) / ΔG ≤ 19.000 degrees, where TTL is defined as the distance from the object-side surface of the first lens element to an imaging plane on the optical axis, ΔHFOV is defined as the absolute value of the change in half the viewing angle of the optical imaging lens between a first focus state and a second focus state, and ΔG is defined as the absolute value of the change in the total air gap between the first focus state and the second focus state.

[0007] In one embodiment of the present invention, an optical axis region of the image-side surface of the third lens element is convex, and the fifth lens element has a negative refractive power. The optical imaging lens comprises only five lens elements and satisfies (TTL*ΔHFOV) / ΔG ≤ 15.000 degrees, where TTL is defined as the distance from the object-side surface of the first lens element to an imaging plane on the optical axis, ΔHFOV is defined as the absolute value of the change in half the viewing angle of the optical imaging lens between a first focus state and a second focus state, and ΔG is defined as the absolute value of the change in the total air gap between the first focus state and the second focus state.

[0008] In one embodiment of the present invention, an optical axis region of the image-side surface of the third lens element is convex, an optical axis region of the image-side surface of the fourth lens element is convex, and an optical axis region of the object-side surface of the fifth lens element is concave. The optical imaging lens comprises only five lenses and satisfies (TTL*ΔHFOV) / ΔG ≤ 19.000 degrees, where TTL is defined as the distance from the object-side surface of the first lens element to an imaging plane on the optical axis, ΔHFOV is defined as the absolute value of the change in half the viewing angle of the optical imaging lens between a first focus state and a second focus state, and ΔG is defined as the absolute value of the change in the total air gap between the first focus state and the second focus state.

[0009] In one embodiment of the present invention, an optical axis region of the image-side surface of the third lens element is convex, a circumferential region of the object-side surface of the fourth lens element is convex, and the fifth lens element has a negative refractive power. The optical imaging lens comprises only five lenses and satisfies (TTL*ΔHFOV) / ΔG ≤ 19.000 degrees, where TTL is defined as the distance from the object-side surface of the first lens element to an imaging plane on the optical axis, ΔHFOV is defined as the absolute value of the change in half the viewing angle of the optical imaging lens between a first focus state and a second focus state, and ΔG is defined as the absolute value of the change in the total air gap between the first focus state and the second focus state.

[0010] In the optical imaging lens of the present invention, each embodiment may also selectively meet the following conditions:

[0011] (V1+V3) / V2≧3.400;

[0012] TTL / (G34+BFL)≦3.500;

[0013] TL / (T1+T3)≦3.300;

[0014] ALT / (G23+G45)≧4.700;

[0015] (T1+G12) / T5≦2.700;

[0016] ImgH / (T4+G45+T5)≧0.900;

[0017] (V3+V5) / V4≧3.400;

[0018] TTL / EFL≦2.000;

[0019] TL / AAG≧2.000;

[0020] ALT / (T1+G12+T2)≧1.800;

[0021] T3 / (G23+G45)≧1.000;

[0022] ImgH / (T2+G23)≧2.800;

[0023] V2+V3+V4≦130,000;

[0024] TTL / ALT≦2.800;

[0025] BFL / (T3+G34)≦3.800;

[0026] AAG / ΔG≦5.000;

[0027] (T2+T4+G45) / T5≦1.800;

[0028] EFL / EFLA≦1.500

[0029] |f1 / f2|≦1.500;

[0030] f4 / f5≦-1.500;

[0031] f4 / f3≦17.000;

[0032] f3 / f5≦0.000;

[0033] ALT / Tmin≧10.000;

[0034] Tmax / Tavg ≤ 2.200; and

[0035] TTL / (Tmax+Tmin)≦7.000.

[0036] 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. AAG is defined as the sum of the four air gaps between the first and fifth lenses on the optical axis.

[0037] Redefine: 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. V1 is defined as the Abbe number of the first lens; V2 is defined as the Abbe number of the second lens; V3 is defined as the Abbe number of the third lens; V4 is defined as the Abbe number of the fourth lens; and V5 is defined as the Abbe number of the fifth lens. 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; TL is defined as the distance from the object side of the first lens to the image side of the fifth lens on the optical axis; TTL is defined as the distance from the object side of the first lens to the imaging plane on the optical axis; BFL is defined as the distance from the image side of the fifth lens to the imaging plane on the optical axis; EFL is defined as the effective focal length in the first focus state; ImgH is defined as the image height of the optical imaging lens; Tmax is defined as the maximum value of the thicknesses of the five lenses from the first lens to the fifth lens on the optical axis; Tmin is defined as the minimum value of the thicknesses of the five lenses from the first lens to the fifth lens on the optical axis; Tavg is defined as the average value of the thicknesses of the five lenses from the first lens to the fifth lens on the optical axis. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] For a clearer understanding of the embodiments of the present invention, please refer to the following figures:

[0039] Figures 1 to 5 A schematic diagram illustrating a method for determining the curvature shape of an optical imaging lens according to the present invention is shown.

[0040] Figure 6 A schematic diagram illustrating a first embodiment of the optical imaging lens system of the present invention is shown.

[0041] Figure 7 A shows the longitudinal spherical aberration on the imaging plane in the first focusing state of the first embodiment.

[0042] Figure 7 B shows the field curvature aberration in the sagittal direction in the first focus state of the first embodiment.

[0043] Figure 7 C shows the field curvature aberration in the tangential direction in the first focus state of the first embodiment.

[0044] Figure 7 D shows the distortion aberration in the first focus state of the first embodiment.

[0045] Figure 7 E shows the longitudinal spherical aberration on the imaging plane in the second focus state of the first embodiment.

[0046] Figure 7 F shows the field curvature aberration in the sagittal direction in the second focus state of the first embodiment.

[0047] Figure 7 G shows the field curvature aberration in the tangential direction in the second focus state of the first embodiment.

[0048] Figure 7 H shows the distortion aberration in the second focus state of the first embodiment.

[0049] Figure 8 A schematic diagram illustrating a second embodiment of the optical imaging lens system of the present invention is shown.

[0050] Figure 9 A shows the longitudinal spherical aberration on the imaging plane in the first focus state of the second embodiment.

[0051] Figure 9 B shows the field curvature aberration in the sagittal direction in the first focus state of the second embodiment.

[0052] Figure 9 C shows the field curvature aberration in the tangential direction in the first focus state of the second embodiment.

[0053] Figure 9 D shows the distortion aberration in the first focus state of the second embodiment.

[0054] Figure 9 E shows the longitudinal spherical aberration on the imaging plane in the second focus state of the second embodiment.

[0055] Figure 9 F shows the field curvature aberration in the sagittal direction in the second focus state of the second embodiment.

[0056] Figure 9 G shows the field curvature aberration in the tangential direction in the second focus state of the second embodiment.

[0057] Figure 9H shows the distortion aberration in the second focus state of the second embodiment.

[0058] Figure 10 A schematic diagram illustrating a third embodiment of the optical imaging lens system of the present invention is shown.

[0059] Figure 11 A shows the longitudinal spherical aberration on the imaging plane in the first focus state of the third embodiment.

[0060] Figure 11 B shows the field curvature aberration in the sagittal direction in the first focus state of the third embodiment.

[0061] Figure 11 C shows the field curvature aberration in the tangential direction in the first focus state of the third embodiment.

[0062] Figure 11 D shows the distortion aberration in the first focus state of the third embodiment.

[0063] Figure 11 E shows the longitudinal spherical aberration on the imaging plane in the second focus state of the third embodiment.

[0064] Figure 11 F shows the field curvature aberration in the sagittal direction in the second focus state of the third embodiment.

[0065] Figure 11 G shows the field curvature aberration in the tangential direction in the second focus state of the third embodiment.

[0066] Figure 11 H shows the distortion aberration in the second focus state of the third embodiment.

[0067] Figure 12 A schematic diagram illustrating a fourth embodiment of the optical imaging lens system of the present invention is shown.

[0068] Figure 13 A shows the longitudinal spherical aberration on the imaging plane in the first focus state of the fourth embodiment.

[0069] Figure 13 B shows the field curvature aberration in the sagittal direction in the first focus state of the fourth embodiment.

[0070] Figure 13 C shows the field curvature aberration in the tangential direction in the first focus state of the fourth embodiment.

[0071] Figure 13 D shows the distortion aberration in the first focus state of the fourth embodiment.

[0072] Figure 13 E shows the longitudinal spherical aberration on the imaging plane in the second focus state of the fourth embodiment.

[0073] Figure 13 F shows the field curvature aberration in the sagittal direction in the second focus state of the fourth embodiment.

[0074] Figure 13 G shows the field curvature aberration in the tangential direction in the second focus state of the fourth embodiment.

[0075] Figure 13 H shows the distortion aberration in the second focus state of the fourth embodiment.

[0076] Figure 14 A schematic diagram illustrating a fifth embodiment of the optical imaging lens system of the present invention is shown.

[0077] Figure 15 A shows the longitudinal spherical aberration on the imaging plane in the first focus state of the fifth embodiment.

[0078] Figure 15 B shows the field curvature aberration in the sagittal direction in the first focus state of the fifth embodiment.

[0079] Figure 15 C shows the field curvature aberration in the tangential direction in the first focus state of the fifth embodiment.

[0080] Figure 15 D shows the distortion aberration in the first focus state of the fifth embodiment.

[0081] Figure 15 E shows the longitudinal spherical aberration on the imaging plane in the second focus state of the fifth embodiment.

[0082] Figure 15 F shows the field curvature aberration in the sagittal direction in the second focus state of the fifth embodiment.

[0083] Figure 15 G shows the field curvature aberration in the tangential direction in the second focus state of the fifth embodiment.

[0084] Figure 15 H shows the distortion aberration in the second focus state of the fifth embodiment.

[0085] Figure 16 A schematic diagram illustrating a sixth embodiment of the optical imaging lens system of the present invention is shown.

[0086] Figure 17 A shows the longitudinal spherical aberration on the imaging plane in the first focus state of the sixth embodiment.

[0087] Figure 17 B shows the field curvature aberration in the sagittal direction in the first focus state of the sixth embodiment.

[0088] Figure 17C shows the field curvature aberration in the tangential direction in the first focus state of the sixth embodiment.

[0089] Figure 17 D shows the distortion aberration in the first focus state of the sixth embodiment.

[0090] Figure 17 E shows the longitudinal spherical aberration on the imaging plane in the second focus state of the sixth embodiment.

[0091] Figure 17 F shows the field curvature aberration in the sagittal direction in the second focus state of the sixth embodiment.

[0092] Figure 17 G shows the field curvature aberration in the tangential direction in the second focus state of the sixth embodiment.

[0093] Figure 17 H shows the distortion aberration in the second focus state of the sixth embodiment.

[0094] Figure 18 A schematic diagram illustrating a seventh embodiment of the optical imaging lens system of the present invention is shown.

[0095] Figure 19 A shows the longitudinal spherical aberration on the imaging plane in the first focus state of the seventh embodiment.

[0096] Figure 19 B shows the field curvature aberration in the sagittal direction in the first focus state of the seventh embodiment.

[0097] Figure 19 C shows the field curvature aberration in the tangential direction in the first focus state of the seventh embodiment.

[0098] Figure 19 D shows the distortion aberration in the first focus state of the seventh embodiment.

[0099] Figure 19 E shows the longitudinal spherical aberration on the imaging plane in the second focus state of the seventh embodiment.

[0100] Figure 19 F shows the field curvature aberration in the sagittal direction in the second focus state of the seventh embodiment.

[0101] Figure 19 G shows the field curvature aberration in the tangential direction in the second focus state of the seventh embodiment.

[0102] Figure 19 H shows the distortion aberration in the second focus state of the seventh embodiment.

[0103] Figure 20 A schematic diagram illustrating an eighth embodiment of the optical imaging lens system of the present invention is shown.

[0104] Figure 21 A shows the longitudinal spherical aberration on the imaging plane in the first focus state of the eighth embodiment.

[0105] Figure 21 B shows the field curvature aberration in the sagittal direction in the first focus state of the eighth embodiment.

[0106] Figure 21 C shows the field curvature aberration in the tangential direction in the first focus state of the eighth embodiment.

[0107] Figure 21 D shows the distortion aberration in the first focus state of the eighth embodiment.

[0108] Figure 21 E illustrates the longitudinal spherical aberration on the imaging plane in the second focus state of the eighth embodiment.

[0109] Figure 21 F shows the field curvature aberration in the sagittal direction in the second focus state of the eighth embodiment.

[0110] Figure 21 G shows the field curvature aberration in the tangential direction in the second focus state of the eighth embodiment.

[0111] Figure 21 H shows the distortion aberration in the second focus state of the eighth embodiment.

[0112] Figure 22 A table diagram showing detailed optical data of the first embodiment.

[0113] Figure 23 A table showing detailed aspheric surface data of the first embodiment.

[0114] Figure 24 A table diagram showing detailed optical data of the second embodiment.

[0115] Figure 25 A table showing detailed aspheric surface data of the second embodiment.

[0116] Figure 26 A table diagram showing detailed optical data of the third embodiment.

[0117] Figure 27 A table showing detailed aspheric surface data of the third embodiment.

[0118] Figure 28 A table diagram showing detailed optical data of the fourth embodiment.

[0119] Figure 29 A table showing detailed aspheric surface data of the fourth embodiment.

[0120] Figure 30A table diagram showing detailed optical data of the fifth embodiment.

[0121] Figure 31 A table showing detailed aspheric surface data of the fifth embodiment.

[0122] Figure 32 A table diagram showing detailed optical data of the sixth embodiment.

[0123] Figure 33 A table showing detailed aspheric surface data of the sixth embodiment.

[0124] Figure 34 A table diagram showing detailed optical data of the seventh embodiment.

[0125] Figure 35 A table showing detailed aspheric surface data of the seventh embodiment.

[0126] Figure 36 A table diagram showing detailed optical data of the eighth embodiment.

[0127] Figure 37 A table showing detailed aspheric surface data of the eighth embodiment.

[0128] Figure 38 A table diagram showing important parameters of the first focus state of various embodiments is shown.

[0129] Figure 39 A table diagram showing important parameters of the second focus state of various embodiments is shown. DETAILED DESCRIPTION

[0130] Before describing the present invention in detail, the following symbols are clearly indicated in the accompanying drawings: 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 surface; 12, 22, 32, 42, 52…image side surface; 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…chief ray; Lm…marginal ray; TP1…first transition point; TP2…second transition point; Z3…relay area; 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…lenses; 130…assembly part; 211, 212…parallel rays.

[0131] To further illustrate various embodiments, the present invention provides drawings. These drawings form part of the disclosure and are primarily intended to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, a person skilled in the art will be able to understand other possible embodiments and the advantages of the present invention. Elements in the figures are not drawn to scale, and similar reference numerals 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 of this specification includes at least one lens, which receives the imaging light of the incident optical system that is parallel to the optical axis and within the half field of view (HFOV) angle relative to the optical axis. The imaging light is imaged on the imaging surface through the optical system. The so-called "a lens has a positive refractive power (or negative refractive power)" means that the paraxial refractive power of the lens calculated by Gaussian optical theory is positive (or negative). The so-called "object side (or image side) of the lens" is defined as the specific range of the imaging light passing through the lens surface. The imaging light includes at least two types of light: the chief ray Lc and the marginal ray Lm (such as Figure 1 The object-side surface (or image-side surface) of the lens can be divided into different regions based on different positions, including an optical axis region, a circumferential region, or one or more intermediate regions in some embodiments. These regions are described in detail below.

[0134] Figure 1 is a radial cross-sectional view of the lens 100. Two reference points on the surface of the lens 100 are defined: the center point and the transition point. The center point of the lens surface is an intersection of the surface and the optical axis I. Figure 1 As shown in the example, the first center point CP1 is located on the object side surface 110 of the lens 100, and the second center point CP2 is located on the image side surface 120 of the lens 100. A conversion point is a point on the lens surface, and the tangent of the point is perpendicular to the optical axis I. The optical boundary OB of the lens surface is defined as the point where the radially outermost edge ray Lm passing through the lens surface intersects the lens surface. All conversion points are located between the optical axis I and the optical boundary OB of the lens surface. In addition, the surface of the lens 100 may have no conversion points or at least one conversion point. If a single lens surface has multiple conversion points, the conversion points are named in order from the first conversion point in the radial outward direction. For example, the first conversion point TP1 (closest to the optical axis I), the second conversion point TP2 (such as Figure 4 as shown) and the Nth conversion point (farthest from the optical axis I).

[0135] When the lens surface has at least one transition point, the range from the center point to the first transition point TP1 is defined as the optical axis area, wherein the optical axis area includes the center point. The area radially outward from the transition point farthest from the optical axis I (the Nth transition point) to the optical boundary OB is defined as the circumferential area. In some embodiments, a relay area between the optical axis area and the circumferential area may be included, and the number of relay areas depends on the number of transition points. When the lens surface does not have a transition point, 0% to 50% of the distance from the optical axis I to the optical boundary OB of the lens surface is defined as the optical axis area, and 50% to 100% of the distance from the optical axis I to the optical boundary OB of the lens surface is defined as the circumferential area.

[0136] When a light ray parallel to the optical axis I passes through an area and is deflected toward the optical axis I, and its intersection with the optical axis I is located on the image side A2 of the lens, the area is considered convex. When a light ray parallel to the optical axis I passes through an area and its extension intersects the optical axis I on the object side A1 of the lens, the area is considered concave.

[0137] In addition, see Figure 1 Lens 100 may also include an assembly portion 130 extending radially outward from optical boundary OB. Assembly portion 130 is generally used to assemble lens 100 to a corresponding element (not shown) in an optical system. Imaging light does not reach assembly portion 130. The structure and shape of assembly portion 130 are merely illustrative of the present invention and are not intended to limit the scope of the present invention. Assembly portion 130 of the lens discussed below may be partially or entirely omitted from the drawings.

[0138] See also Figure 2 , define the area between the center point CP and the first transition point TP1 as the optical axis area Z1. Define the area between the first transition point TP1 and the optical boundary OB of the lens surface as the circumferential area Z2. Figure 2 As shown, after passing through the optical axis region Z1, the parallel light 211 intersects the optical axis I at the image side A2 of the lens 200. That is, the focus of the parallel light 211 passing through the optical axis region Z1 is located at point R on the image side A2 of the lens 200. Since the light intersects the optical axis I at the image side A2 of the lens 200, the optical axis region Z1 is a convex surface. Conversely, the parallel light 212 diverges after passing through the circumferential region Z2. Figure 2 As shown, the extended line EL of the parallel light 212 after passing through the circumferential area Z2 intersects the optical axis I at the object side A1 of the lens 200, that is, the focus of the parallel light 212 passing through the circumferential area Z2 is located at point M on the object side A1 of the lens 200. Since the extended line EL of the light intersects the optical axis I at the object side A1 of the lens 200, the circumferential area Z2 is a concave surface. Figure 2 In the lens 200 shown, the first transition point TP1 is the boundary between the optical axis area and the circumferential area, that is, the first transition point TP1 is the boundary point from the convex surface to the concave surface.

[0139] Alternatively, the optical axis region's surface convexity can be determined using a method commonly used by those skilled in the art. This method uses the sign of the paraxial radius of curvature (abbreviated as the R value) to determine the surface concavity of the lens' optical axis region. The R value is commonly used in optical design software such as Zemax or CodeV. It is also commonly found in lens data sheets within optical design software. Regarding the object side, a positive R value indicates that the optical axis region on the object side is convex; a negative R value indicates that the optical axis region on the object side is concave. Conversely, regarding the image side, a positive R value indicates that the optical axis region on the image side is concave; a negative R value indicates that the optical axis region on the image side is convex. The results of this method are consistent with the previously described method of determining surface concavity based on the intersection of a ray / ray extension line with the optical axis. This method uses the focus of a ray parallel to the optical axis on either the object or image side of the lens to determine surface concavity. In this specification, “a region is a convex surface (or a concave surface)”, “a region is convex (or concave)” or “a convex (or concave) region” may be used interchangeably.

[0140] Figures 3 to 5 Examples are provided for determining the surface shape and area boundaries of lens areas in various situations, including the aforementioned optical axis area, circumferential area, and relay area.

[0141] Figure 3 is a radial cross-sectional view of the lens 300. Figure 3 , the image side surface 320 of the lens 300 has only one transition point TP1 within the optical boundary OB. The optical axis area Z1 and the circumferential area Z2 of the image side surface 320 of the lens 300 are as follows: Figure 3 The R value of the image-side surface 320 is positive (ie, R>0), and therefore, the optical axis region Z1 is a concave surface.

[0142] Generally speaking, the shape of each area bounded by a transition point is opposite to that of the adjacent areas. Therefore, the transition point can be used to define the transition of the surface shape, that is, from concave to convex or from convex to concave. Figure 3 In the figure, since the optical axis area Z1 is a concave surface, the surface shape changes at the transition point TP1, so the circumferential area Z2 is a convex surface.

[0143] Figure 4 is a radial cross-sectional view of the lens 400. Figure 4 The object-side surface 410 of the lens 400 has a first transition point TP1 and a second transition point TP2. The area between the optical axis I and the first transition point TP1 is defined as the optical axis region Z1 of the object-side surface 410. The R value of the object-side surface 410 is positive (i.e., R>0), and therefore, the optical axis region Z1 is convex.

[0144] The area between the second transition point TP2 and the optical boundary OB of the object side surface 410 of the lens 400 is defined as a circumferential area Z2. The circumferential area Z2 of the object side surface 410 is also convex. In addition, the area between the first transition point TP1 and the second transition point TP2 is defined as a relay area Z3. The relay area Z3 of the object side surface 410 is concave. Figure 4 The object-side surface 410 includes, radially outward from the optical axis I, an optical axis region Z1 between the optical axis I and a first turning point TP1, an intermediate region Z3 between the first turning point TP1 and a second turning point TP2, and a circumferential region Z2 between the second turning 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, the surface shape changes from the first turning point TP1 to concave, resulting in the intermediate region Z3 being concave. Since the surface shape changes again from the second turning point TP2 to convex, the circumferential region Z2 is convex.

[0145] Figure 5 is a radial cross-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 area 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 area is defined as 50% to 100% of the distance from the optical axis I to the optical boundary OB of the lens surface. Figure 5 In the illustrated lens 500, the optical axis region Z1 of the object-side surface 510 is defined as the distance from the optical axis I to 50% of the distance from the optical axis I to the optical boundary OB of the lens 500 surface. The R value of the object-side surface 510 is positive (i.e., R>0), and therefore, the optical axis region Z1 is convex. Because the object-side surface 510 of the lens 500 lacks a transition point, the circumferential region Z2 of the object-side surface 510 is also convex. The lens 500 may further include an assembly portion (not shown) extending radially outward from the circumferential region Z2.

[0146] like Figure 6As shown, the optical imaging lens 1 of the present invention is primarily composed of five lenses along the optical axis I, from the object side A1 where an object (not shown) is placed to the image side A2 where the image is formed. These lenses include, in order, 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. The first lens in the front lens group 81, as counted from the object side A1, is the first lens 10; the second lens in the front lens group 81, as counted from the object side A1, is the second lens 20; and the third lens in the front lens group 81, as counted 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 present invention, the rear lens group 82 may include at least two lenses. For example, the first lens in the rear lens group 82 from the image side A2 is the fifth lens 50 , and the second lens in the rear lens group 82 from the image side A2 is the fourth lens 40 , but the present invention is not limited thereto.

[0147] The rear lens group 82 can move along the optical axis I to enable the optical imaging lens system 1 to form different focus states, such as different first focus states and second focus states. The first focus state and the second focus state can be, respectively, one of an infinite object distance and a finite object distance and the other. In one embodiment of the present invention, the first focus state can be an infinite object distance. Alternatively, in another embodiment of the present invention, the second focus state can be a finite object distance, 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 a transparent plastic material, but the present invention is not limited thereto. Each lens has an appropriate refractive index. In the optical imaging lens 1 of the present invention, the only lenses with refractive index are 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, the optical imaging lens 1 further includes an aperture stop 2, which is set at an appropriate position. Figure 6In the optical imaging lens 1 of the present invention, aperture 2 is disposed on the side of the first lens 10 facing the object side A1, that is, between object side A1 and the first lens 10. When light (not shown) emitted by an object to be photographed (not shown) located on object side A1 enters the optical imaging lens 1 of the present invention, it passes through aperture 2, first lens 10, second lens 20, third lens 30, fourth lens 40, fifth lens 50, and filter 3 in sequence, before being focused on imaging plane 4 on image side A2, forming a clear image. In various embodiments of the present invention, filter 3 is disposed between fifth lens 50 and imaging plane 4. It can be a filter having 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 imaging plane 4 and affecting 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 through which imaging light passes, and an image-side surface facing the image side A2 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 further 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 along 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, second, third, fourth, and fifth lenses along the optical axis I in the optical imaging lens 1 of the present invention. In other words, ALT = T1 + T2 + T3 + T4 + T5. Tmax is the maximum value of the five lens thicknesses along the optical axis I of the first through fifth lenses 10 through 50, i.e., the maximum value among T1, T2, T3, T4, and T5. Tmin is the minimum value of the five lens thicknesses along the optical axis I of the first through fifth lenses 10 through 50, i.e., the minimum value among T1, T2, T3, T4, and T5. Tavg is an average value of thicknesses of five lenses of the first lens 10 to the fifth lens 50 on the optical axis I. That is, Tavg=ALT / 5.

[0152] In addition, the optical imaging lens 1 of the present invention has air gaps between each lens element along the optical axis I. Since the optical imaging lens 1 of the present invention is designed as a focusing lens, the air gaps between each lens element can be variable. For example, the air gap between the first lens element 10 and the second lens element 20 is G12, the air gap between the second lens element 20 and the third lens element 30 is G23, the air gap between the third lens element 30 and the fourth lens element 40 is G34, and the air gap between the fourth lens element 40 and the fifth lens element 50 is G45. Therefore, the sum of the four air gaps between each lens element along the optical axis I, from the first lens element 10 to the fifth lens element 50, is AAG. In other words, AAG = G12 + G23 + G34 + G45. AAG1 is the sum of the air gap distances of the optical imaging lens 1 on the optical axis I when the optical imaging lens 1 is in the first focus state; AAG2 is the sum of the air gap distances of the optical imaging lens 1 on the optical axis I when the optical imaging lens 1 is in the second focus state; ΔG is the absolute value of the change in the sum of the air gap distances between the first focus state and the second focus state of the optical imaging lens 1, that is, ΔG = |AAG1 - AAG2|.

[0153] The distance from the object-side surface 11 of the first lens 10 to the imaging 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 focus state formed by the optical imaging lens 1 is EFL, and the effective focal length of the second focus state formed by the optical imaging lens 1 is EFLA. HFOV is the half angle of view of the optical imaging lens 1, that is, half of the maximum angle of view (Field of View), and ΔHFOV is the absolute value of the change in the half angle of view of the optical imaging lens 1 between the first focus state and the second focus state.

[0154] When the filter 3 is arranged between the fifth lens 50 and the imaging plane 4, G5F represents the air gap between the fifth lens 50 and the filter 3 on the optical axis I, TF represents the thickness of the filter 3 on the optical axis I, GFP represents the air gap between the filter 3 and the imaging plane 4 on the optical axis I, and BFL is the back focal length of the optical imaging lens 1, that is, the distance between the image-side surface 52 of the fifth lens 50 and the imaging plane 4 on the optical axis I, that is, BFL = G5F + TF + GFP.

[0155] In addition, it is further defined that: f1 is the focal length of the first lens 10; f2 is the focal length of the second lens 20; f3 is the focal length of the third lens 30; f4 is the focal length of the fourth lens 40; f5 is the focal length of the fifth lens 50; 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; V1 is the Abbe number of the first lens 10; V2 is the Abbe number of the second lens 20; V3 is the Abbe number of the third lens 30; V4 is the Abbe number of the fourth lens 40; and V5 is the Abbe number of the fifth lens 50.

[0156] First embodiment

[0157] See also Figure 6 , illustrating the first embodiment of the optical imaging lens 1 of the present invention. The longitudinal spherical aberration (longitudinal spherical aberration) on the imaging surface 4 in the first focus state of the first embodiment can be referred to Figure 7 A. For the field curvature in the sagittal direction in the first focus state, please refer to Figure 7 B, the field curvature aberration in the tangential direction of the first focus state, please refer to Figure 7 C, distortion aberration of the first focus state (distortion aberration) please refer to Figure 7 For the longitudinal spherical aberration of D and the second focus state on the imaging plane 4, please refer to Figure 7 For E and sagittal field curvature in the second focus state, please refer to Figure 7 For the field curvature aberration in the tangential direction of the second focus state, please refer to Figure 7 For G and distortion in the second focus state, please refer to Figure 7 The Y-axis of each spherical aberration diagram in all embodiments represents the field of view, and the highest point thereof is 1.0. The Y-axis of each aberration diagram and distortion diagram in the embodiments 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 primarily comprises an aperture 2, a front lens group 81, a rear lens group 82, and an imaging surface 4. The aperture 2 of the first embodiment 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 together comprise five lenses with refractive powers: the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, and the fifth lens 50. 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 element 10 has positive refractive power. The optical axis region 13 of the object-side surface 11 of the first lens element 10 is convex, and its circumferential region 14 is convex. The optical axis region 16 of the image-side surface 12 of the first lens element 10 is concave, and its circumferential region 17 is concave. Both the object-side surface 11 and the image-side surface 12 of the first lens element 10 are aspherical surfaces, but this is not limiting.

[0160] The second lens element 20 has a negative refractive power. The optical axis region 23 of the object-side surface 21 of the second lens element 20 is convex, and its circumferential region 24 is convex. The optical axis region 26 of the image-side surface 22 of the second lens element 20 is concave, and its circumferential region 27 is concave. Both the object-side surface 21 and the image-side surface 22 of the second lens element 20 are aspherical surfaces, but this is not limiting.

[0161] The third lens element 30 has positive refractive power. The object-side surface 31 of the third lens element 30 has a convex surface in the optical axis region 33 and a concave surface in the circumferential region 34. The image-side surface 32 of the third lens element 30 has a convex surface in the optical axis region 36 and a convex surface in the circumferential region 37. Both the object-side surface 31 and the image-side surface 32 of the third lens element 30 are aspherical surfaces, but the present invention is not limited thereto.

[0162] The fourth lens element 40 has positive refractive power. The optical axis region 43 of the object-side surface 41 of the fourth lens element 40 is concave, and the circumferential region 44 thereof is convex. The optical axis region 46 of the image-side surface 42 of the fourth lens element 40 is convex, and the circumferential region 47 thereof is concave. Both the object-side surface 41 and the image-side surface 42 of the fourth lens element 40 are aspherical surfaces, but the present invention is not limited thereto.

[0163] The fifth lens element 50 has a negative refractive power. The optical axis region 53 of the object-side surface 51 of the fifth lens element 50 is concave, and its circumferential region 54 is also concave. The optical axis region 56 of the image-side surface 52 of the fifth lens element 50 is concave, and its circumferential region 57 is convex. Both the object-side surface 51 and the image-side surface 52 of the fifth lens element 50 are aspherical surfaces, but the present invention is not limited thereto.

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

[0165]

[0166] in:

[0167] Y represents the vertical distance between the point on the aspheric surface and the optical axis I;

[0168] Z represents the depth of the aspheric surface (the vertical distance between the point on the aspheric surface that is Y away from the optical axis I and the tangent plane that is tangent to the vertex on the aspheric surface on the optical axis I);

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

[0172] The optical data of the optical imaging lens system 1 of the first embodiment are as follows: Figure 22 As shown, the aspheric data is as follows Figure 23 In the optical imaging lens system 1 of the following embodiment, the aperture value (f-number) of the entire optical imaging lens 1 is Fno, the effective focal length in the first focus state is EFL, the effective focal length in the second focus state is EFLA, and the half field of view (HFOV) is half of the maximum field of view (FOV) of the entire optical imaging lens 1. The image height, radius of curvature, thickness, and focal length of the optical imaging lens 1 are all expressed in millimeters (mm). In this embodiment, EFL = 13.873 mm, EFLA = 9.629 mm, the aperture value in the first focus state = 3.089, the aperture value in the second focus state = 2.144, the half field of view in the first focus state = 14.080 degrees, the half field of view in the second focus state = 13.522 degrees, the focal length of the front lens group 81 = 8.024 mm, the focal length of the rear lens group 82 = -9.642 mm, the system length = 14.335 mm, and the image height = 3.500 mm.

[0173] Second embodiment

[0174] See also Figure 8, illustrating the second embodiment of the optical imaging lens 1 of the present invention. Please note that starting from the second embodiment, for the sake of simplicity and clarity of the diagrams, only the optical axis regions and circumferential regions of each lens that differ from the first embodiment are specifically marked on the diagrams, while the optical axis regions and circumferential regions of the lenses that have the same surface shapes as the first embodiment, such as concave or convex surfaces, are not marked separately. For the longitudinal spherical aberration on the imaging plane 4 of the second embodiment in the first focus state, please refer to Figure 9 For the field curvature aberration in the sagittal direction of A and the first focus state, please refer to Figure 9 For the field curvature aberration in the tangential direction of B and the first focus state, please refer to Figure 9 For the distortion of C and the first focus state, please refer to Figure 9 For the longitudinal spherical aberration of D and the second focus state on the imaging plane 4, please refer to Figure 9 For E and sagittal field curvature in the second focus state, please refer to Figure 9 For the field curvature aberration in the tangential direction of the second focus state, please refer to Figure 9 For G and distortion in the second focus state, please refer to Figure 9 The design of the second embodiment is similar to that of the first embodiment, differing only in parameters such as the lens refractive power, lens radius of curvature, lens thickness, lens aspheric coefficient, or back focal length. Furthermore, in this embodiment, the circumferential region 17 of the image-side surface 12 of the first lens element 10 is convex, the circumferential region 24 of the object-side surface 21 of the second lens element 20 is concave, the circumferential region 34 of the object-side surface 31 of the third lens element 30 is convex, and the fourth lens element 40 has a negative refractive power.

[0175] The detailed optical data of the second embodiment are as follows Figure 24 As shown, the aspheric data is as follows Figure 25In this embodiment, EFL = 13.299 mm, EFLA = 9.433 mm, the aperture value in the first focus state = 3.072, the aperture value in the second focus state = 2.235, the half angle of view in the first focus state = 14.769 degrees, the half angle of view in the second focus state = 14.386 degrees, the focal length of the front lens group 81 = 7.800 mm, the focal length of the rear lens group 82 = -9.796 mm, the system length = 14.357 mm, and the image height = 3.500 mm. In particular: 1. the field curvature aberration in the sagittal direction of the first focusing state of this embodiment is better than the field curvature aberration in the sagittal direction of the first focusing state of the first embodiment; 2. the field curvature aberration in the tangential direction of the first focusing state of this embodiment is better than the field curvature aberration in the tangential direction of the first focusing state of the first embodiment; 3. the distortion aberration of the first focusing state of this embodiment is better than the distortion aberration of the first focusing state of the first embodiment; 4. the field curvature aberration in the sagittal direction of the second focusing state of this embodiment is better than the field curvature aberration in the sagittal direction of the second focusing state of the first embodiment; 5. the field curvature aberration in the tangential direction of the second focusing state of this embodiment is better than the field curvature aberration in the tangential direction of the second focusing state of the first embodiment; 6. the distortion aberration of the second focusing state of this embodiment is better than the distortion aberration of the second focusing state of the first embodiment.

[0176] Third embodiment

[0177] See also Figure 10 , illustrating the third embodiment of the optical imaging lens 1 of the present invention. The longitudinal spherical aberration of the first focus state on the imaging surface 4 of the third embodiment can be referred to Figure 11 For the field curvature aberration in the sagittal direction of A and the first focus state, please refer to Figure 11 For the field curvature aberration in the tangential direction of B and the first focus state, please refer to Figure 11 For the distortion of C and the first focus state, please refer to Figure 11 For the longitudinal spherical aberration of D and the second focus state on the imaging plane 4, please refer to Figure 11 For E and sagittal field curvature in the second focus state, please refer to Figure 11 For the field curvature aberration in the tangential direction of the second focus state, please refer to Figure 11 For G and distortion in the second focus state, please refer to Figure 11The design of the third embodiment is similar to that of the first embodiment, except that only parameters such as the lens refractive power, lens radius of curvature, lens thickness, lens aspheric coefficient, or back focal length are different. In addition, in this embodiment, the optical axis region 16 of the image-side surface 12 of the first lens element 10 is convex, the circumferential region 17 of the image-side surface 12 of the first lens element 10 is convex, the optical axis region 23 of the object-side surface 21 of the second lens element 20 is concave, the circumferential region 24 of the object-side surface 21 of the second lens element 20 is concave, and the circumferential region 27 of the image-side surface 22 of the second lens element 20 is convex. The third lens element 30 has a negative refractive power, the optical axis region 33 of the object-side surface 31 of the third lens element 30 is concave, the circumferential region 37 of the image-side surface 32 of the third lens element 30 is concave, the circumferential region 47 of the image-side surface 42 of the fourth lens element 40 is convex, and the circumferential region 57 of the image-side surface 52 of the fifth lens element 50 is concave.

[0178] The detailed optical data of the third embodiment are as follows: Figure 26 As shown, the aspheric data is as follows Figure 27 As shown, in this embodiment, EFL = 11.986 mm, EFLA = 8.097 mm, the aperture value of the first focus state = 3.070, the aperture value of the second focus state = 2.074, the half angle of view of the first focus state = 15.440 degrees, the half angle of view of the second focus state = 14.925 degrees, the focal length of the front lens group 81 = 7.640 mm, the focal length of the rear lens group 82 = -9.275 mm, the system length = 11.552 mm, and the image height = 3.500 mm. In particular: 1. The system length TTL of the present embodiment is shorter than the system length TTL of the first embodiment; 2. The field curvature aberration in the sagittal direction of the first focusing state of the present embodiment is better than the field curvature aberration in the sagittal direction of the first focusing state of the first embodiment; 3. The field curvature aberration in the meridional direction of the first focusing state of the present embodiment is better than the field curvature aberration in the meridional direction of the first focusing state of the first embodiment; 4. The field curvature aberration in the sagittal direction of the second focusing state of the present embodiment is better than the field curvature aberration in the sagittal direction of the second focusing state of the first embodiment; 5. The field curvature aberration in the meridional direction of the second focusing state of the present embodiment is better than the field curvature aberration in the meridional direction of the second focusing state of the first embodiment.

[0179] Fourth embodiment

[0180] See also Figure 12 , illustrating the 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 focus state of the fourth embodiment, please refer to Figure 13 For the field curvature aberration in the sagittal direction of A and the first focus state, please refer to Figure 13 For the field curvature aberration in the tangential direction of B and the first focus state, please refer to Figure 13 For the distortion of C and the first focus state, please refer to Figure 13For the longitudinal spherical aberration of D and the second focus state on the imaging plane 4, please refer to Figure 13 For E and sagittal field curvature in the second focus state, please refer to Figure 13 For the field curvature aberration in the tangential direction of the second focus state, please refer to Figure 13 For G and distortion in the second focus state, please refer to Figure 13 The design of the fourth embodiment is similar to that of the first embodiment, differing only in parameters such as lens refractive index, lens radius of curvature, lens thickness, lens aspheric coefficient, and back focal length. Furthermore, in this embodiment, the first lens element 10 has a negative refractive index, the second lens element 20 has a positive refractive index, the circumferential region 34 of the object-side surface 31 of the third lens element 30 is convex, and the fourth lens element 40 has a negative refractive index.

[0181] The detailed optical data of the fourth embodiment are as follows Figure 28 As shown, the aspheric data is as follows Figure 29 In this embodiment, EFL = 9.773 mm, EFLA = 7.655 mm, the aperture value in the first focus state = 3.070, the aperture value in the second focus state = 2.405, the half angle of view in the first focus state = 20.235 degrees, the half angle of view in the second focus state = 20.182 degrees, the focal length of the front lens group 81 = 5.123 mm, the focal length of the rear lens group 82 = -5.498 mm, the system length = 12.236 mm, and the image height = 3.500 mm. In particular: 1. The system length TTL of the present embodiment is shorter than the system length TTL of the first embodiment; 2. The field curvature aberration in the sagittal direction of the first focusing state of the present embodiment is better than the field curvature aberration in the sagittal direction of the first focusing state of the first embodiment; 3. The field curvature aberration in the meridional direction of the first focusing state of the present embodiment is better than the field curvature aberration in the meridional direction of the first focusing state of the first embodiment; 4. The field curvature aberration in the sagittal direction of the second focusing state of the present embodiment is better than the field curvature aberration in the sagittal direction of the second focusing state of the first embodiment; 5. The field curvature aberration in the meridional direction of the second focusing state of the present embodiment is better than the field curvature aberration in the meridional direction of the second focusing state of the first embodiment.

[0182] Fifth embodiment

[0183] See also Figure 14 , illustrating the fifth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the imaging plane 4 in the first focus state of the fifth embodiment, please refer to Figure 15 For the field curvature aberration in the sagittal direction of A and the first focus state, please refer to Figure 15 For the field curvature aberration in the tangential direction of B and the first focus state, please refer to Figure 15 For the distortion of C and the first focus state, please refer to Figure 15 For the longitudinal spherical aberration of D and the second focus state on the imaging plane 4, please refer to Figure 15 For E and sagittal field curvature in the second focus state, please refer to Figure 15 For the field curvature aberration in the tangential direction of the second focus state, please refer to Figure 15 For G and distortion in the second focus state, please refer to Figure 15 H. The design of the fifth embodiment is similar to that of the first embodiment, except that only the lens parameters such as the refractive power, lens radius of curvature, lens thickness, lens aspheric coefficient, or back focal length are different. In addition, in this embodiment, the optical axis region 13 of the object-side surface 11 of the first lens 10 is concave, the circumferential region 14 of the object-side surface 11 of the first lens 10 is concave, the optical axis region 16 of the image-side surface 12 of the first lens 10 is convex, the circumferential region 17 of the image-side surface 12 of the first lens 10 is convex, the circumferential region 24 of the object-side surface 21 of the second lens 20 is concave, the circumferential region 27 of the image-side surface 22 of the second lens 20 is convex, the circumferential region 44 of the object-side surface 41 of the fourth lens 40 is concave, and the circumferential region 47 of the image-side surface 42 of the fourth lens 40 is convex.

[0184] The detailed optical data of the fifth embodiment are as follows Figure 30 As shown, the aspheric data is as follows Figure 31 As shown, in this embodiment, EFL = 8.036 mm, EFLA = 6.832 mm, the aperture value of the first focus state = 3.070, the aperture value of the second focus state = 2.610, the half angle of view of the first focus state = 23.279 degrees, the half angle of view of the second focus state = 23.067 degrees, the focal length of the front lens group 81 = 3.860 mm, the focal length of the rear lens group 82 = -4.799 mm, the system length = 10.807 mm, and the image height = 3.500 mm. In particular: 1. The system length TTL of the present embodiment is shorter than the system length TTL of the first embodiment; 2. The field curvature aberration in the sagittal direction of the first focusing state of the present embodiment is better than the field curvature aberration in the sagittal direction of the first focusing state of the first embodiment; 3. The field curvature aberration in the meridional direction of the first focusing state of the present embodiment is better than the field curvature aberration in the meridional direction of the first focusing state of the first embodiment; 4. The field curvature aberration in the sagittal direction of the second focusing state of the present embodiment is better than the field curvature aberration in the sagittal direction of the second focusing state of the first embodiment; 5. The field curvature aberration in the meridional direction of the second focusing state of the present embodiment is better than the field curvature aberration in the meridional direction of the second focusing state of the first embodiment.

[0185] Sixth embodiment

[0186] See also Figure 16 , illustrating the 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 focus state of the sixth embodiment, please refer to Figure 17 For the field curvature aberration in the sagittal direction of A and the first focus state, please refer to Figure 17For the field curvature aberration in the tangential direction of B and the first focus state, please refer to Figure 17 For the distortion of C and the first focus state, please refer to Figure 17 For the longitudinal spherical aberration of D and the second focus state on the imaging plane 4, please refer to Figure 17 For E and sagittal field curvature in the second focus state, please refer to Figure 17 For the field curvature aberration in the tangential direction of the second focus state, please refer to Figure 17 For G and distortion in the second focus state, please refer to Figure 17 The design of the sixth embodiment is similar to that of the first embodiment, except that only the relevant parameters such as the lens refractive power, lens curvature radius, lens thickness, lens aspheric coefficient, or back focal length are different.

[0187] The detailed optical data of the sixth embodiment are as follows Figure 32 As shown, the aspheric data is as follows Figure 33 As shown, in this embodiment, EFL = 13.829 mm, EFLA = 9.544 mm, the aperture value of the first focus state = 3.093, the aperture value of the second focus state = 2.240, the half angle of view of the first focus state = 14.124 degrees, the half angle of view of the second focus state = 13.481 degrees, the focal length of the front lens group 81 = 7.936 mm, the focal length of the rear lens group 82 = -9.169 mm, the system length = 14.601 mm, and the image height = 3.500 mm. In particular: 1. the longitudinal spherical aberration of the first focusing state of the present embodiment is better than the longitudinal spherical aberration of the first focusing state of the first embodiment; 2. the field curvature aberration in the sagittal direction of the first focusing state of the present embodiment is better than the field curvature aberration in the sagittal direction of the first focusing state of the first embodiment; 3. the field curvature aberration in the meridional direction of the first focusing state of the present embodiment is better than the field curvature aberration in the meridional direction of the first focusing state of the first embodiment; 4. the longitudinal spherical aberration of the second focusing state of the present embodiment is better than the longitudinal spherical aberration of the second focusing state of the first embodiment; 5. the field curvature aberration in the sagittal direction of the second focusing state of the present embodiment is better than the field curvature aberration in the sagittal direction of the second focusing state of the first embodiment; 6. the field curvature aberration in the meridional direction of the second focusing state of the present embodiment is better than the field curvature aberration in the meridional direction of the second focusing state of the first embodiment.

[0188] Seventh embodiment

[0189] See also Figure 18 , illustrating the 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 focus state of the seventh embodiment, please refer to Figure 19 For the field curvature aberration in the sagittal direction of A and the first focus state, please refer to Figure 19 For the field curvature aberration in the tangential direction of B and the first focus state, please refer to Figure 19 For the distortion of C and the first focus state, please refer to Figure 19 For the longitudinal spherical aberration of D and the second focus state on the imaging plane 4, please refer to Figure 19 For E and sagittal field curvature in the second focus state, please refer to Figure 19 For the field curvature aberration in the tangential direction of the second focus state, please refer to Figure 19 For G and distortion in the second focus state, please refer to Figure 19 The design of the seventh embodiment is similar to that of the first embodiment, differing in parameters such as lens refractive index, lens radius of curvature, lens thickness, lens aspheric coefficient, and back focal length. Furthermore, in this embodiment, the circumferential region 34 of the object-side surface 31 of the third lens element 30 is convex, and the circumferential region 47 of the image-side surface 42 of the fourth lens element 40 is also convex.

[0190] The detailed optical data of the seventh embodiment are as follows Figure 34 As shown, the aspheric data is as follows Figure 35 As shown, in this embodiment, EFL = 12.901 mm, EFLA = 9.436 mm, the aperture value of the first focus state = 3.082, the aperture value of the second focus state = 2.341, the half angle of view of the first focus state = 15.126 degrees, the half angle of view of the second focus state = 13.732 degrees, the focal length of the front lens group 81 = 7.701 mm, the focal length of the rear lens group 82 = -10.764 mm, the system length = 13.404 mm, and the image height = 3.500 mm. In particular: 1. The longitudinal spherical aberration of the first focusing state of the present embodiment is better than the longitudinal spherical aberration of the first focusing state of the first embodiment; 2. The field curvature aberration in the sagittal direction of the first focusing state of the present embodiment is better than the field curvature aberration in the sagittal direction of the first focusing state of the first embodiment; 3. The field curvature aberration in the meridional direction of the first focusing state of the present embodiment is better than the field curvature aberration in the meridional direction of the first focusing state of the first embodiment; 4. The longitudinal spherical aberration of the second focusing state of the present embodiment is better than the longitudinal spherical aberration of the second focusing state of the first embodiment; 5. The field curvature aberration in the sagittal direction of the second focusing state of the present embodiment is better than the field curvature aberration in the sagittal direction of the second focusing state of the first embodiment; 6. The field curvature aberration in the meridional direction of the second focusing state of the present embodiment is better than the field curvature aberration in the meridional direction of the second focusing state of the first embodiment; 7. The system length TTL of the present embodiment is smaller than the system length TTL of the first embodiment.

[0191] Eighth embodiment

[0192] See also Figure 20 , illustrating the 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 focus state of the eighth embodiment, please refer to Figure 21 For the field curvature aberration in the sagittal direction of A and the first focus state, please refer to Figure 21 For the field curvature aberration in the tangential direction of B and the first focus state, please refer to Figure 21 For the distortion of C and the first focus state, please refer to Figure 21 For the longitudinal spherical aberration of D and the second focus state on the imaging plane 4, please refer to Figure 21 For E and sagittal field curvature in the second focus state, please refer to Figure 21 For the field curvature aberration in the tangential direction of the second focus state, please refer to Figure 21 For G and distortion in the second focus state, please refer to Figure 21 The design of the eighth embodiment is similar to that of the first embodiment, except that related parameters such as the lens refractive power, lens radius of curvature, lens thickness, lens aspheric coefficient, or back focal length are different. Furthermore, in this embodiment, the front lens group 81 includes the first lens 10 and the second lens 20, and the rear lens group 82 includes the third lens 30, the fourth lens 40, and the fifth lens 50. The circumferential region 34 of the object-side surface 31 of the third lens 30 is convex, the fourth lens 40 has a negative refractive power, the circumferential region 44 of the object-side surface 41 of the fourth lens 40 is concave, and the circumferential region 47 of the image-side surface 42 of the fourth lens 40 is convex.

[0193] The detailed optical data of the eighth embodiment are as follows Figure 36 As shown, the aspheric data is as follows Figure 37 As shown, in this embodiment, EFL = 10.190 mm, EFLA = 9.482 mm, the aperture value of the first focus state = 3.080, the aperture value of the second focus state = 2.866, the half angle of view of the first focus state = 18.086 degrees, the half angle of view of the second focus state = 15.098 degrees, the focal length of the front lens group 81 = 27.912 mm, the focal length of the rear lens group 82 = 13.415 mm, the system length = 13.171 mm, and the image height = 3.500 mm. In particular: 1. The longitudinal spherical aberration of the first focusing state of the present embodiment is better than the longitudinal spherical aberration of the first focusing state of the first embodiment; 2. The field curvature aberration in the sagittal direction of the first focusing state of the present embodiment is better than the field curvature aberration in the sagittal direction of the first focusing state of the first embodiment; 3. The field curvature aberration in the meridional direction of the first focusing state of the present embodiment is better than the field curvature aberration in the meridional direction of the first focusing state of the first embodiment; 4. The longitudinal spherical aberration of the second focusing state of the present embodiment is better than the longitudinal spherical aberration of the second focusing state of the first embodiment; 5. The field curvature aberration in the sagittal direction of the second focusing state of the present embodiment is better than the field curvature aberration in the sagittal direction of the second focusing state of the first embodiment; 6. The field curvature aberration in the meridional direction of the second focusing state of the present embodiment is better than the field curvature aberration in the meridional direction of the second focusing state of the first embodiment; 7. The system length TTL of the present embodiment is smaller than the system length TTL of the first embodiment.

[0194] In addition, the important parameters of the first focus state or the second focus state of each embodiment are respectively summarized in Figure 38and Figure 39 .

[0195] Various embodiments of the present invention provide a compact, focusing, high-quality, and technically feasible five-element optical imaging lens. For example, designs satisfying the following lens shapes and refractive indices or parameters can effectively optimize the imaging quality of the optical imaging lens 1 of the present invention and achieve corresponding functional benefits:

[0196] 1. When the fifth lens element 50 has a negative refractive power, the optical axis region 53 of the object-side surface 51 of the fifth lens element 50 is concave, and the optical axis region 56 of the image-side surface 52 of the fifth lens element 50 is concave, aberrations caused by the first through fourth lens elements 10 through 40 can be corrected and light convergence can be facilitated. When the subject moves from infinity to macro distance, the optical imaging lens 1 forms first and second focus states to achieve focusing. When the effective focal lengths of the two focus states meet the ratio constraint of (TTL*ΔHFOV) / ΔG ≤ 19.000 degrees, the system length of the optical imaging lens 1 remains constant while maintaining good image quality during focusing. The preferred range of (TTL*ΔHFOV) / ΔG is 0.750 degrees ≤ (TTL*ΔHFOV) / ΔG ≤ 19.000 degrees.

[0197] 2. When the optical axis region 36 of the image-side surface 32 of the third lens element 30 is convex, and the optical axis region 53 of the object-side surface 51 of the fifth lens element 50 is concave, aberrations caused by the first lens element 10 and the second lens element 20 are reduced and light convergence is facilitated. Combined with a negative refractive power in the fifth lens element 50 or a convex optical axis region 46 of the image-side surface 42 of the fourth lens element 40, edge aberrations of the imaging plane are reduced. When the subject moves from infinity to macro distance, the optical imaging lens 1 forms first and second focus states to achieve focusing. When the effective focal lengths of the two focus states meet the ratio of (TTL*ΔHFOV) / ΔG ≤ 19.000 degrees, the system length of the optical imaging lens 1 remains constant while maintaining good image quality during focusing. The preferred range of (TTL*ΔHFOV) / ΔG is 0.750 degrees ≤ (TTL*ΔHFOV) / ΔG ≤ 19.000 degrees.

[0198] 3. When the optical axis region 36 of the image-side surface 32 of the third lens element 30 is convex, the circumferential region 44 of the object-side surface 41 of the fourth lens element 40 is convex, and the fifth lens element 50 has a negative refractive power, these features can mitigate central and peripheral aberrations caused by the first and second lens elements 10 and 20 and facilitate light convergence. When the subject moves from infinity to macro distance, the optical imaging lens 1 correspondingly forms first and second focus states to achieve focusing. When the effective focal lengths of the two focus states meet the ratio constraint of (TTL*ΔHFOV) / ΔG ≤ 19.000 degrees, the system length of the optical imaging lens 1 remains constant while maintaining good image quality during focusing. The preferred range of (TTL*ΔHFOV) / ΔG is 0.750 degrees ≤ (TTL*ΔHFOV) / ΔG ≤ 19.000 degrees.

[0199] 4. When the optical axis region 36 of the image-side surface 32 of the third lens element 30 is convex and the fifth lens element 50 has a negative refractive power, central and peripheral aberrations caused by the first lens element 10 and the second lens element 20 are reduced, and light convergence is facilitated. When the subject moves from infinity to macro distance, the optical imaging lens 1 correspondingly forms the first and second focus states to achieve focusing. If the effective focal lengths of the two focus states further satisfy the ratio of (TTL*ΔHFOV) / ΔG ≤ 15.000 degrees, good image quality can be maintained during focusing. Adjusting the air gap between the two focus states also helps shorten the system length of the imaging lens 1. The preferred range of (TTL*ΔHFOV) / ΔG is 0.750 degrees ≤ (TTL*ΔHFOV) / ΔG ≤ 15.000 degrees.

[0200] 5. The optical imaging lens 1 of the present invention comprises a front lens group 81 and a rear lens group 82. Each of the front lens group 81 and the rear lens group 82 comprises at least two lenses. When the subject moves from infinity to macro distance, the rear lens group 82 moves along the optical axis, positioning the optical imaging lens 1 between first and second focus states to achieve focusing while maintaining a constant system length. When the effective focal lengths of the two focus states meet the ratio of EFL / EFLA ≤ 1.500, the optical imaging lens 1 can maintain a compact size while still achieving good image quality at various subject distances. The preferred range of EFL / EFLA is 1.000 ≤ EFL / EFLA ≤ 1.500.

[0201] 6. When the refractive index of the front lens group 81 of the optical imaging lens 1 of the present invention is positive and the refractive index of the rear lens group 82 is positive or negative, the positive refractive index of the front lens group 81 converges light, and the distance between the front lens group 81 and the rear lens group 82 is adjusted by moving the rear lens group 82 along the optical axis, thereby achieving good image quality for objects at different object distances.

[0202] 7. The optical imaging lens 1 of the present invention can form a first and a second focusing state, enabling the subject to be smoothly focused and imaged with good image quality when moved from infinity to a distance of 40 mm to 55 mm in front of the optical imaging lens 1 of the present invention.

[0203] 8. When the focal lengths of the lenses of the present invention satisfy the ranges or ratios shown in Table 1 below, it is beneficial to lens formation and improves assembly yield.

[0204] Conditional expression Optimal range |f1 / f2|≦1.500 - f4 / f5≦-1.500 -12.500≦f4 / f5≦-1.500 f4 / f3≦17.000 0.000≦f4 / f3≦17.000 f3 / f5≦0.000 -1.000≦f3 / f5≦0.000

[0205] Table 1

[0206] 9. When the lens material meets the restrictions shown in Table 2 below, 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 in different focusing states.

[0207] Conditional expression Optimal range (V1+V3) / V2≧3.400 3.400≦(V1+V3) / V2≦5.200 (V3+V5) / V4≧3.400 3.400≦(V3+V5) / V4≦5.200 V2+V3+V4≦130.000 90.000≦V2+V3+V4≦130.000

[0208] Table 2

[0209] 10. When the image height of the optical imaging lens 1 is matched with the thickness and gap of a specific lens, and the proportional relationship shown in Table 3 below is satisfied, the optical imaging lens 1 can maintain good imaging quality.

[0210] Conditional expression Optimal range ImgH / (T4+G45+T5)≧0.900 0.900≦ImgH / (T4+G45+T5)≦1.800 ImgH / (T2+G23)≧2.800 2.800≦ImgH / (T2+G23)≦5.000

[0211] Table 3

[0212] 11. When the first and second focusing states of the optical imaging lens 1 satisfy AAG / ΔG ≤ 5.000, adjusting the air gap between the lenses can ensure that the optical imaging lens 1 maintains good imaging quality in both focusing states. The preferred range is 0.250 ≤ AAG / ΔG ≤ 5.000.

[0213] 12. To ensure image quality, reduce lens size, and consider manufacturing difficulty, the air gap between lenses or the lens thickness is appropriately shortened or maintained at a certain ratio. When the numerical limits of the conditional expression shown in Table 4 below are met, the embodiments of the present invention can achieve a better configuration.

[0214]

[0215] Table 4

[0216] In addition, any combination of parameters of the embodiment can be selected to increase lens restrictions, so as to facilitate the design of lenses with the same architecture of the present invention.

[0217] Given the unpredictability of optical system design, the present invention, under its framework, complies with the aforementioned conditions to preferably improve imaging quality, reduce size, or increase assembly yield, thereby overcoming the shortcomings of prior art. Furthermore, the use of plastic material in the lens of the present invention further reduces lens weight and saves costs.

[0218] The numerical ranges obtained by the combination ratio relationship of the optical parameters disclosed in various embodiments of the present invention, including the maximum and minimum values, can be implemented accordingly.

[0219] The contents disclosed in various embodiments of the present invention include, but are not limited to, optical parameters such as focal length, lens thickness, and Abbe number. For example, each embodiment of the present invention discloses an optical parameter A and an optical parameter B. The ranges covered by these optical parameters, the comparative relationships between the optical parameters, and the conditional ranges covered by various embodiments are specifically explained as follows:

[0220] (1) The range covered by the optical parameters, for example: α2≦A≦α1 or β2≦B≦β1, α1 is the maximum value of the optical parameter A in multiple embodiments, α2 is the minimum value of the optical parameter A in multiple embodiments, β1 is the maximum value of the optical parameter B in multiple embodiments, and β2 is the minimum value of the optical parameter B in multiple embodiments.

[0221] (2) The comparative relationship between optical parameters, for example: A is greater than B or A is less than B.

[0222] (3) The range of conditions covered by multiple embodiments, specifically, the combination relationship or proportional relationship obtained by possible calculation of multiple optical parameters of the same embodiment, which is defined as E. E can be, for example: A+B or AB or A / B or A*B or (A*B) 1 / 2 , and E satisfies the conditional formula E≦γ1 or E≧γ2 or γ2≦E≦γ1, γ1 and γ2 are the values ​​obtained by calculating the optical parameters A and B of the same embodiment, and γ1 is the maximum value among multiple embodiments of the present invention, and γ2 is the minimum value among multiple embodiments of the present invention.

[0223] The ranges encompassed by the aforementioned optical parameters, the comparative relationships between the optical parameters, and the maximum and minimum values, as well as the numerical ranges within these conditional expressions, are all features that can be implemented by the present invention and fall within the scope disclosed herein. The above is merely illustrative and should not be construed as limiting.

[0224] All embodiments of the present invention are applicable, and some feature combinations can be extracted from the same embodiment. These feature combinations can achieve unexpected benefits compared to prior art. These feature combinations include, but are not limited to, combinations of face shape, refractive index, and conditional formulas. The disclosure of the embodiments of the present invention is intended to illustrate the principles of the present invention and should not be construed as limiting the present invention to the disclosed embodiments. Furthermore, the embodiments and accompanying figures are intended for illustrative purposes only and are not intended to limit the present invention.

[0225] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. An optical imaging lens comprising, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, wherein each of the first to fifth lenses includes an object-side surface facing the object side and through which imaging light passes, and an image-side surface facing the image side and through which the imaging light passes, characterized in that: When the subject moves from infinity to macro distance, the optical imaging lens forms a first focus state and a second focus state to achieve focusing. The fifth lens element has a negative refractive power, an optical axis region of the object-side surface of the fifth lens element is concave, and an optical axis region of the image-side surface of the fifth lens element is also concave. The optical imaging lens comprises only five lenses and satisfies ΔG = |AAG1 - AAG2|, (TTL*ΔHFOV) / ΔG ≤ 19.000 degrees, and TTL / ALT ≤ 2.

800. TTL is defined as the distance from the object-side surface of the first lens to an imaging plane on the optical axis, ΔHFOV is defined as the absolute value of half the change in viewing angle of the optical imaging lens between the first and second focusing states, AAG1 is the sum of the distances of the four air gaps between the first to fifth lenses on the optical axis in the first focusing state, AAG2 is the sum of the distances of the four air gaps between the first to fifth lenses on the optical axis in the second focusing state, and ALT is defined as the sum of the thicknesses of the five lenses on the optical axis from the first to fifth lenses.

2. An optical imaging lens comprising, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, wherein each of the first to fifth lenses includes an object-side surface facing the object side and through which imaging light passes, and an image-side surface facing the image side and through which the imaging light passes, characterized in that: When the subject moves from infinity to macro, the optical imaging lens forms a first focus state and a second focus state accordingly to achieve the focusing purpose; An optical axis region of the image-side surface of the third lens is a convex surface; The fifth lens element has a negative refractive power, and an optical axis region of the object-side surface of the fifth lens element is concave; The optical imaging lens comprises only five lenses and satisfies ΔG = |AAG1 - AAG2|, (TTL*ΔHFOV) / ΔG ≤ 19.000 degrees, and TTL / ALT ≤ 2.

800. TTL is defined as the distance from the object-side surface of the first lens to an imaging plane on the optical axis, ΔHFOV is defined as the absolute value of half the change in viewing angle of the optical imaging lens between the first and second focusing states, AAG1 is the sum of the distances of the four air gaps between the first to fifth lenses on the optical axis in the first focusing state, AAG2 is the sum of the distances of the four air gaps between the first to fifth lenses on the optical axis in the second focusing state, and ALT is defined as the sum of the thicknesses of the five lenses on the optical axis from the first to fifth lenses.

3. An optical imaging lens comprising, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, wherein each of the first to fifth lenses includes an object-side surface facing the object side and through which imaging light passes, and an image-side surface facing the image side and through which the imaging light passes, characterized in that: When the subject moves from infinity to macro, the optical imaging lens forms a first focus state and a second focus state accordingly to achieve the focusing purpose; An optical axis region of the image-side surface of the third lens is a convex surface; The fifth lens has a negative refractive power; The optical imaging lens comprises only five lenses and satisfies ΔG = |AAG1 - AAG2|, (TTL*ΔHFOV) / ΔG ≤ 15.000 degrees, and TTL / ALT ≤ 2.800, wherein TTL is defined as the distance from the object-side surface of the first lens to an imaging plane on the optical axis, ΔHFOV is defined as the absolute value of half the change in viewing angle of the optical imaging lens between the first and second focusing states, AAG1 is the sum of the distances of the four air gaps between the first to fifth lenses on the optical axis in the first focusing state, AAG2 is the sum of the distances of the four air gaps between the first to fifth lenses on the optical axis in the second focusing state, and ALT is defined as the sum of the thicknesses of the five lenses on the optical axis from the first to fifth lenses.

4. The optical imaging lens according to any one of claims 1 to 3, wherein: V1 is defined as the Abbe number of the first lens, V2 is defined as the Abbe number of the second lens, V3 is defined as the Abbe number of the third lens, and the optical imaging lens satisfies the following condition: (V1+V3) / V2≧3.

400.

5. The optical imaging lens according to any one of claims 1 to 3, wherein: G34 is defined as the air gap between the third lens and the fourth lens on the optical axis, BFL is defined as the distance from the image-side surface of the fifth lens to the imaging plane on the optical axis, and the optical imaging lens satisfies the following condition: TTL / (G34+BFL)≦3.

500.

6. The optical imaging lens according to any one of claims 1 to 3, wherein: TL is defined as the distance from the object-side surface of the first lens to the image-side surface of the fifth lens on the optical axis, T1 is defined as the thickness of the first lens on the optical axis, and T3 is defined as the thickness of the third lens on the optical axis. The optical imaging lens satisfies the following condition: TL / (T1+T3)≦3.

300.

7. The optical imaging lens according to any one of claims 1 to 3, wherein: G23 is defined as the air gap between the second lens and the third 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: ALT / (G23+G45)≧4.

700.

8. The optical imaging lens according to any one of claims 1 to 3, wherein: T1 is defined as the thickness of the first 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 the optical imaging lens satisfies the following condition: (T1+G12) / T5≦2.

700.

9. The optical imaging lens according to any one of claims 1 to 3, wherein: ImgH is defined as an image height of the optical imaging lens, T4 is defined as the thickness of the fourth lens element on the optical axis, T5 is defined as the thickness of the fifth lens element on the optical axis, G45 is defined as the air gap between the fourth lens element and the fifth lens element on the optical axis, and the optical imaging lens satisfies the following condition: ImgH / (T4+G45+T5)≧0.

900.

10. The optical imaging lens according to any one of claims 1 to 3, wherein: V3 is defined as the Abbe number of the third lens, V4 is defined as the Abbe number of the fourth lens, V5 is defined as the Abbe number of the fifth lens, and the optical imaging lens satisfies the following condition: (V3+V5) / V4≧3.

400.

11. The optical imaging lens according to any one of claims 1 to 3, wherein: EFL is the effective focal length of the first focusing state, and the optical imaging lens meets the following condition: TTL / EFL≦2.

000.

12. The optical imaging lens according to any one of claims 1 to 3, wherein: TL is defined as the distance from the object-side surface of the first lens to the image-side surface of the fifth lens on the optical axis, AAG is defined as the sum of four air gaps from the first lens to the fifth lens on the optical axis, and the optical imaging lens satisfies the following condition: TL / AAG≧2.

000.

13. The optical imaging lens according to any one of claims 1 to 3, wherein: T1 is defined as the thickness of the first lens on the optical axis, T2 is defined as the thickness of the second lens on the optical axis, 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: ALT / (T1+G12+T2)≧1.

800.

14. The optical imaging lens according to any one of claims 1 to 3, wherein: T3 is defined as the thickness of the third lens on the optical axis, G23 is defined as the air gap between the second lens and the third 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: T3 / (G23+G45)≧1.

000.

15. The optical imaging lens according to any one of claims 1 to 3, wherein: ImgH is defined as the image height of the optical imaging lens, T2 is defined as the thickness of the second lens element on the optical axis, G23 is defined as the air gap between the second lens element and the third lens element on the optical axis, and the optical imaging lens satisfies the following condition: ImgH / (T2+G23)≧2.

800.

16. The optical imaging lens according to any one of claims 1 to 3, wherein: V2 is defined as the Abbe number of the second lens, V3 is defined as the Abbe number of the third lens, V4 is defined as the Abbe number of the fourth lens, and the optical imaging lens satisfies the following condition: V2+V3+V4≦130.

000.

17. The optical imaging lens according to any one of claims 1 to 3, wherein: BFL is defined as the distance from the image-side surface of the fifth lens element to the imaging plane on the optical axis, T3 is defined as the thickness of the third lens element on the optical axis, G34 is defined as the air gap between the third lens element and the fourth lens element on the optical axis, and the optical imaging lens element satisfies the following condition: BFL / (T3+G34)≦3.

800.

18. The optical imaging lens according to any one of claims 1 to 3, wherein: AAG is defined as the sum of four air gaps from the first lens to the fifth lens on the optical axis, and the optical imaging lens satisfies the following condition: AAG / ΔG≦5.

000.

19. The optical imaging lens according to any one of claims 1 to 3, wherein: T2 is defined as the thickness of the second lens on the optical axis, T4 is defined as the thickness of the fourth lens on the optical axis, T5 is defined as the thickness of the fifth lens on the optical axis, 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: (T2+T4+G45) / T5≦1.800.

Images