Optical imaging lens

Abstract

The present invention discloses an optical imaging lens, which includes a first lens, a second lens, a third lens and a fourth lens in order from the object side to the image side along the optical axis, and each lens has an object side surface and an image side surface. The optical axis area of ​​the object side surface of the first lens is a convex surface; the refractive index of at least one of the second lens and the third lens is negative; HFOV is the half field angle of the optical imaging lens, TTL is the distance from the object side surface of the first lens to an imaging surface on the optical axis, and AAG is the sum of three air gaps on the optical axis from the first lens to the fourth lens, and the conditional formula is satisfied: HFOV≦15.000° and TTL / AAG≧10.000. The optical imaging lens of the present invention can increase the system focal length of the optical imaging lens, ensure imaging quality, a smaller aperture value, and have good optical performance.

Description

[0001] This invention patent application is a divisional application. The application number of the original application is 201910553150.8, the application date is June 25, 2019, and the invention name is: Optical Imaging Lens. Technical Field

[0002] The present invention relates to the field of optical imaging, and in particular to an optical imaging lens. Background Art

[0003] The specifications of portable electronic products are changing with each passing day, and their key components - optical imaging lenses - are also becoming more diversified. Their application range is not limited to shooting images and videos, but also requires telephoto photography. With wide-angle lenses, the function of optical zoom can be achieved. If the system focal length of the telephoto lens is longer, the optical zoom ratio can be higher.

[0004] However, when the system focal length of the optical imaging lens increases, the aperture value will increase, resulting in a decrease in the amount of light entering. Therefore, how to increase the system focal length of the optical imaging lens while reducing the aperture value, maintaining the image quality, and improving assembly and manufacturing yield is a topic that needs to be explored in depth. Summary of the invention

[0005] Therefore, each embodiment of the present invention proposes a four-piece optical imaging lens that can increase the system focal length of the optical imaging lens, ensure the imaging quality, have a smaller aperture value, have good optical performance, and is technically feasible. The four-piece optical imaging lens of the present invention has a first lens, a second lens, a third lens, and a fourth lens arranged in sequence on the optical axis from the object side to the image side. The first lens, the second lens, the third lens, and the fourth lens in the four-piece optical imaging lens of the present invention each have an object-side surface facing the object side and allowing the imaging light to pass through, and an image-side surface facing the image side and allowing the imaging light to pass through.

[0006] In an optical imaging lens provided according to an embodiment of the present invention, an optical axis region of an object-side surface of a first lens is a convex surface, a refractive index of at least one of a second lens and a third lens is negative, an aperture is located between the second lens and the third lens, HFOV≦15.000°, and TTL / AAG≧10.000.

[0007] In an optical imaging lens provided according to another embodiment of the present invention, the first lens has a positive refractive power, the circumferential area of ​​the image side surface of the first lens is a concave surface, the circumferential area of ​​the image side surface of the third lens is a concave surface, the refractive power of at least one of the second lens and the third lens is negative, the aperture is located between the second lens and the third lens, HFOV≦15.000°, and TTL / BFL≦3.500.

[0008] In an optical imaging lens provided according to another embodiment of the present invention, the first lens has a positive refractive power, the circumferential region of the image-side surface of the first lens is a concave surface, the circumferential region of the object-side surface of the third lens is a convex surface, the refractive power of at least one of the second lens and the third lens is negative, the aperture is located between the second lens and the third lens, HFOV≦15.000°, and TTL / BFL≦3.500.

[0009] In an optical imaging lens provided according to another embodiment of the present invention, the first lens has a positive refractive power, the optical axis region of the image side surface of the first lens is a convex surface, the optical axis region of the image side surface of the third lens is a convex surface, the optical axis region of the image side surface of the fourth lens is a concave surface, and the aperture is located between the second lens and the third lens.

[0010] In an optical imaging lens provided according to another embodiment of the present invention, the first lens has a positive refractive power, the third lens has a negative refractive power, the optical axis region of the image-side surface of the third lens is a convex surface, the optical axis region of the image-side surface of the fourth lens is a concave surface, and the aperture is located between the second lens and the third lens.

[0011] In an optical imaging lens provided according to another embodiment of the present invention, the first lens has a positive refractive power, the optical axis region of the image side surface of the third lens is a convex surface, the circumferential region of the image side surface of the third lens is a concave surface, the optical axis region of the image side surface of the fourth lens is a concave surface, and the aperture is located between the second lens and the third lens.

[0012] In an optical imaging lens provided according to another embodiment of the present invention, the third lens has a negative refractive power, the aperture is located between the second lens and the third lens, and HFOV≦15.000°.

[0013] In an optical imaging lens provided according to another embodiment of the present invention, the optical axis area of ​​the object-side surface of the third lens is a concave surface, the aperture is located between the second lens and the third lens, and HFOV≦15.000°.

[0014] In an optical imaging lens provided according to another embodiment of the present invention, the fourth lens has a positive refractive power, the aperture is located between the second lens and the third lens, and the HFOV is ≦15.000°.

[0015] In an optical imaging lens provided according to another embodiment of the present invention, the first lens has a positive refractive power, the optical axis region of the object-side surface of the second lens is a convex surface, the aperture is located between the second lens and the third lens, and HFOV≦15.000°.

[0016] In an optical imaging lens provided according to another embodiment of the present invention, the first lens has a positive refractive power, the circumferential area of ​​the object-side surface of the second lens is a convex surface, the aperture is located between the second lens and the third lens, and HFOV≦15.000°.

[0017] In an optical imaging lens provided according to another embodiment of the present invention, the first lens has a positive refractive power, the optical axis region of the object-side surface of the fourth lens is a convex surface, the aperture is located between the second lens and the third lens, and HFOV≦15.000°.

[0018] In an optical imaging lens provided according to another embodiment of the present invention, the first lens has a positive refractive power, the circumferential area of ​​the object-side surface of the fourth lens is a convex surface, the aperture is located between the second lens and the third lens, and HFOV≦15.000°.

[0019] In an optical imaging lens provided according to another embodiment of the present invention, the first lens has a positive refractive power, the optical axis region of the image-side surface of the fourth lens is a concave surface, the aperture is located between the second lens and the third lens, and HFOV≦15.000°.

[0020] In an optical imaging lens provided according to another embodiment of the present invention, an optical axis region of the image side surface of the first lens is convex, an optical axis region of the object side surface of the third lens is concave, an optical axis region of the image side surface of the third lens is convex, a circumferential region of the image side surface of the third lens is concave, and HFOV≦15.000°.

[0021] In an optical imaging lens provided according to another embodiment of the present invention, an optical axis region of the image side surface of the first lens is convex, an optical axis region of the object side surface of the third lens is concave, a circumferential region of the image side surface of the third lens is concave, an optical axis region of the image side surface of the fourth lens is concave, and HFOV≦15.000°.

[0022] In an optical imaging lens provided according to another embodiment of the present invention, an optical axis region of the image-side surface of the first lens is convex, an optical axis region of the object-side surface of the third lens is concave, a circumferential region of the image-side surface of the third lens is concave, a circumferential region of the image-side surface of the fourth lens is concave, and HFOV≦15.000°.

[0023] In an optical imaging lens provided according to another embodiment of the present invention, the second lens element has a negative refractive power, the third lens element has a negative refractive power, the optical axis region of the image side surface of the third lens element is a convex surface, the circumferential region of the image side surface of the third lens element is a concave surface, and the circumferential region of the image side surface of the fourth lens element is a concave surface.

[0024] In an optical imaging lens provided according to another embodiment of the present invention, an optical axis region of the image-side surface of the first lens is convex, the second lens has a negative refractive power, an optical axis region of the object-side surface of the second lens is convex, an optical axis region of the object-side surface of the third lens is concave, a circumferential region of the image-side surface of the third lens is concave, and a circumferential region of the image-side surface of the fourth lens is concave.

[0025] In an optical imaging lens provided according to another embodiment of the present invention, an optical axis region of the image-side surface of the first lens is convex, the second lens has a negative refractive power, a circumferential region of the object-side surface of the second lens is convex, an optical axis region of the object-side surface of the third lens is concave, a circumferential region of the image-side surface of the third lens is concave, and a circumferential region of the image-side surface of the fourth lens is concave.

[0026] In an optical imaging lens provided according to another embodiment of the present invention, an optical axis region of the image-side surface of the first lens is convex, the second lens has a negative refractive power, the third lens has a negative refractive power, an optical axis region of the object-side surface of the third lens is concave, a circumferential region of the image-side surface of the third lens is concave, and a circumferential region of the image-side surface of the fourth lens is concave.

[0027] Wherein, T1 is the thickness of the first lens on the optical axis;

[0028] T2 is the thickness of the second lens on the optical axis;

[0029] T3 is the thickness of the third lens on the optical axis;

[0030] T4 is the thickness of the fourth lens on the optical axis;

[0031] ALT is the sum of the thicknesses of the four lenses from the first lens to the fourth lens on the optical axis, that is, the sum of T1, T2, T3, and T4;

[0032] G12 is the air gap between the first lens and the second lens on the optical axis;

[0033] G23 is the air gap between the second lens and the third lens on the optical axis;

[0034] G34 is the air gap between the third lens and the fourth lens on the optical axis;

[0035] AAG is the sum of the three air gaps on the optical axis from the first lens to the fourth lens, that is, the sum of G12, G23, and G34;

[0036] TL is the distance on the optical axis from the object side of the first lens to the image side of the fourth lens;

[0037] TTL is the distance from the object side of the first lens to the imaging surface on the optical axis;

[0038] BFL is the distance from the image side surface of the fourth lens to the imaging surface on the optical axis;

[0039] HFOV is the half field of view angle of the optical imaging lens;

[0040] ImgH is the image height of the optical imaging lens;

[0041] EFL is the system focal length of the optical imaging lens.

[0042] In addition, define:

[0043] G4F is the air gap between the fourth lens and the filter on the optical axis;

[0044] TF is the thickness of the filter on the optical axis;

[0045] GFP is the air gap between the filter and the imaging surface on the optical axis;

[0046] f1 is the focal length of the first lens;

[0047] f2 is the focal length of the second lens;

[0048] f3 is the focal length of the third lens;

[0049] f4 is the focal length of the fourth lens;

[0050] n1 is the refractive index of the first lens;

[0051] n2 is the refractive index of the second lens;

[0052] n3 is the refractive index of the third lens;

[0053] n4 is the refractive index of the fourth lens;

[0054] υ1 is the Abbe number of the first lens;

[0055] υ2 is the Abbe number of the second lens;

[0056] υ3 is the Abbe number of the third lens;

[0057] υ4 is the Abbe number of the fourth lens;

[0058] r1 is the effective radius of the object side of the first lens;

[0059] r2 is the effective radius of the image side of the first lens;

[0060] r3 is the effective radius of the object side of the second lens;

[0061] r4 is the effective radius of the image side of the second lens;

[0062] r5 is the effective radius of the object side of the third lens;

[0063] r6 is the effective radius of the image side of the third lens;

[0064] r7 is the effective radius of the object side of the fourth lens;

[0065] r8 is the effective radius of the image-side surface of the fourth lens.

[0066] The present invention is particularly directed to an optical imaging lens mainly used for shooting images and recording videos, and can be applied to portable electronic products such as mobile phones, cameras, tablet computers, or personal digital assistants (PDAs). BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figures 1 to 5 A schematic diagram illustrating a method for determining a curvature shape of an optical imaging lens according to the present invention is shown.

[0068] Figure 6 A schematic diagram of a first embodiment of the optical imaging lens of the present invention is shown.

[0069] Figure 7 Graphs of longitudinal spherical aberration and various aberrations of the first embodiment.

[0070] Figure 8 FIG. 2 is a schematic diagram of a second embodiment of the optical imaging lens of the present invention.

[0071] Fig. 9 Graphs of longitudinal spherical aberration and various aberrations of the second embodiment.

[0072] Fig.10 It is a schematic diagram of a third embodiment of the optical imaging lens of the present invention.

[0073] Fig.11 Graphs of longitudinal spherical aberration and various aberrations of the fourth embodiment.

[0074] Fig.12 It is a schematic diagram of a fourth embodiment of the optical imaging lens of the present invention.

[0075] Fig.13 Graphs of longitudinal spherical aberration and various aberrations of the fourth embodiment.

[0076] Fig.14 It is a schematic diagram of a fifth embodiment of the optical imaging lens of the present invention.

[0077] Fig.15 Graphs showing longitudinal spherical aberration and various aberrations of the fifth embodiment.

[0078] Fig.16 It is a schematic diagram of a sixth embodiment of the optical imaging lens of the present invention.

[0079] Fig.17 Graphs of longitudinal spherical aberration and various aberrations of the sixth embodiment.

[0080] Fig.18 2 is a schematic diagram of a seventh embodiment of the optical imaging lens of the present invention.

[0081] Fig.19 Graphs showing longitudinal spherical aberration and various aberrations of the seventh embodiment.

[0082] Fig. 20 It is a schematic diagram of an eighth embodiment of the optical imaging lens of the present invention.

[0083] Fig.21 Graphs showing longitudinal spherical aberration and various aberrations of the eighth embodiment.

[0084] Fig. 22 A table diagram showing detailed optical data of the first embodiment.

[0085] Fig.23 A table showing detailed aspherical surface data of the first embodiment.

[0086] Fig.24 A table diagram showing detailed optical data of the second embodiment.

[0087] Fig.25 A table showing detailed aspherical surface data of the second embodiment.

[0088] Fig.26 A table diagram showing detailed optical data of the third embodiment.

[0089] Fig. 27 A table showing detailed aspherical surface data of the third embodiment.

[0090] Fig.28 A table diagram showing detailed optical data of the fourth embodiment.

[0091] Fig.29 A table showing detailed aspherical surface data of the fourth embodiment.

[0092] Fig.30 A table diagram showing detailed optical data of the fifth embodiment.

[0093] Fig.31 A table showing detailed aspherical surface data of the fifth embodiment.

[0094] Fig.32 A table diagram showing detailed optical data of the sixth embodiment.

[0095] Fig.33 A table showing detailed aspherical surface data of the sixth embodiment.

[0096] Fig.34A table diagram showing detailed optical data of the seventh embodiment.

[0097] Fig.35 A table showing detailed aspherical surface data of the seventh embodiment.

[0098] Fig.36 A table diagram showing detailed optical data of the eighth embodiment.

[0099] Fig.37 A table showing detailed aspherical surface data of the eighth embodiment.

[0100] Fig.38 A table showing important parameters of each embodiment.

[0101] Fig.39 A table showing important parameters of each embodiment. DETAILED DESCRIPTION

[0102] Before describing the present invention in detail, the following are some of the symbols in the accompanying drawings:

[0103] 1 optical imaging lens; A1 object side; A2 image side; I optical axis; 11, 21, 31, 41 object side; 12, 22, 32, 42 image side; Z1, 13, 16, 23, 26, 33, 36, 43, 46 optical axis area; Z2, 14, 17, 24, 27, 34, 37, 44, 47 circumferential area; CP center point; CP1 first center point; CP2 second center point; OB optical boundary; Lc chief ray; L m edge light; 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; 80 aperture; 90 filter; 91 imaging surface; 100, 200, 300, 400, 500 lenses; 130 assembly part; 211, 212 parallel light; T1, T2, T3, T4 thickness of each lens on the optical axis.

[0104] The optical system of this specification includes at least one lens, which receives imaging light from the incident optical system that is parallel to the optical axis and within a half field of view angle (HFOV) relative to the optical axis. The imaging light forms an image on the imaging plane through the optical system. The phrase "a lens has a positive refractive power (or a negative refractive power)" refers to the paraxial refractive power of the lens calculated by Gaussian optical theory being positive (or negative). The "object side (or image side) of the lens" is defined as a specific range where the imaging light passes through the lens surface. The imaging light includes at least two types of light: the chief ray Lc and the marginal ray Lm (such as Figure 1The object side (or image side) of the lens can be divided into different regions according to different positions, including an optical axis region, a circumferential region, or one or more intermediate regions in some embodiments. The description of these regions will be described in detail below.

[0105] Figure 1 is a radial cross-sectional view of the lens 100. Two reference points on the surface of the lens 100 are defined: a center point and a transition point. The center point of the lens surface is an intersection of the surface and the optical axis I. Figure 1 As shown in the example, the first center point CP1 is located at the object side surface 110 of the lens 100, and the second center point CP2 is located at 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, if a single lens surface has multiple conversion points, the conversion points are named in sequence from the first conversion point in the radial outward direction. For example, the first conversion point TP1 (closest to the optical axis I), the second conversion point TP2 (closest to the optical axis I), and the second conversion point TP2 (closest to the optical axis I). Figure 4 as shown) and the Nth conversion point (farthest from the optical axis I).

[0106] 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 from the Nth transition point farthest from the optical axis I to the optical boundary OB is defined as the circumferential area. In some embodiments, a relay area between the optical axis area and the circumferential area may be further included, and the number of relay areas depends on the number of transition points.

[0107] When a light ray parallel to the optical axis I passes through an area, if the light ray is deflected toward the optical axis I and the intersection with the optical axis I is located at the image side A2 of the lens, then the area is convex. When a light ray parallel to the optical axis I passes through an area, if the intersection of the extended line of the light ray and the optical axis I is located at the object side A1 of the lens, then the area is concave.

[0108] In addition, see Figure 1 The lens 100 may further include an assembly portion 130 extending radially outward from the optical boundary OB. The assembly portion 130 is generally used for assembling the lens 100 to a corresponding component (not shown) of the optical system. The imaging light does not reach the assembly portion 130. The structure and shape of the assembly portion 130 are merely examples for illustrating the present invention and are not intended to limit the scope of the present invention. The assembly portion 130 of the lens discussed below may be partially or completely omitted in the drawings.

[0109] See also Figure 2, define the area between the center point CP and the first transition point TP1 as the optical axis area Z1. Define the area between the first transition point TP1 and the optical boundary OB of the lens surface as the circumferential area Z2. Figure 2 As shown, after passing through the optical axis region Z1, the parallel light 211 intersects with the optical axis I at the image side A2 of the lens 200, that is, the focus of the parallel light 211 passing through the optical axis region Z1 is located at point R on the image side A2 of the lens 200. Since the light intersects with the optical axis I at the image side A2 of the lens 200, the optical axis region Z1 is a convex surface. On the contrary, the parallel light 212 diverges after passing through the circumferential region Z2. Figure 2 As shown, the extended line EL of the parallel light 212 after passing through the circumferential area Z2 intersects with the optical axis I at the object side A1 of the lens 200, that is, the focus of the parallel light 212 passing through the circumferential area Z2 is located at point M on the object side A1 of the lens 200. Since the extended line EL of the light intersects with the optical axis I at the object side A1 of the lens 200, the circumferential area Z2 is a concave surface. Figure 2 In the lens 200 shown, the first transition point TP1 is the boundary between the optical axis area and the circumferential area, that is, the first transition point TP1 is the boundary point where the convex surface turns into the concave surface.

[0110] On the other hand, the surface convexity of the optical axis area can also be determined according to the judgment method of the general knowledgeable person in the field, that is, the convexity of the surface shape of the optical axis area of ​​the lens can be determined by the positive and negative signs of the curvature radius of the paraxial axis (abbreviated as R value). R value can be commonly used in optical design software, such as Zemax or CodeV. R value is also commonly found in the lens data sheet of optical design software. For the object side, when the R value is positive, the optical axis area of ​​the object side is determined to be convex; when the R value is negative, the optical axis area of ​​the object side is determined to be concave. On the contrary, for the image side, when the R value is positive, the optical axis area of ​​the image side is determined to be concave; when the R value is negative, the optical axis area of ​​the image side is determined to be convex. The result of this method is consistent with the result of the above-mentioned determination method by the intersection of the light ray / light extension line and the optical axis. The determination method of the intersection of the light ray / light extension line and the optical axis is to determine the surface convexity by the focus of a light ray parallel to the optical axis located on the object side or image side of the lens. The terms “a region is convex (or concave)”, “a region is convex (or concave)” or “a convex (or concave) region” described in this specification can be used interchangeably.

[0111] 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.

[0112] 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.

[0113] Generally speaking, the shapes of the areas bounded by the conversion point are opposite to those of the adjacent areas. Therefore, the conversion point can be used to define the transition of the surface shape, that is, from concave to convex or from convex to concave. Figure 3 In the figure, since the optical axis area Z1 is a concave surface, the surface shape changes at the transition point TP1, so the circumferential area Z2 is a convex surface.

[0114] Figure 4 is a radial cross-sectional view of the lens 400. Figure 4 , there is a first transition point TP1 and a second transition point TP2 on the object side surface 410 of the lens 400. The area between the optical axis I and the first transition point TP1 is defined as an optical axis region Z1 of the object side surface 410. The R value of the object side surface 410 is positive (ie, R>0), and therefore, the optical axis region Z1 is a convex surface.

[0115] The area between the second transition point TP2 and the optical boundary OB of the object side surface 410 of the lens 400 is defined as a circumferential area Z2, and the circumferential area Z2 of the object side surface 410 is also a convex surface. In addition, the area between the first transition point TP1 and the second transition point TP2 is defined as a relay area Z3, and the relay area Z3 of the object side surface 410 is a concave surface. Figure 4 The object side surface 410 includes, radially outward from the optical axis I, an optical axis region Z1 between the optical axis I and the first conversion point TP1, a relay region Z3 between the first conversion point TP1 and the second conversion point TP2, and a circumferential region Z2 between the second conversion point TP2 and the optical boundary OB of the object side surface 410 of the lens 400. Since the optical axis region Z1 is a convex surface, the surface shape changes from the first conversion point TP1 to a concave surface, so the relay region Z3 is a concave surface, and the surface shape changes from the second conversion point TP2 to a convex surface, so the circumferential region Z2 is a convex surface.

[0116] Figure 5 is a radial cross-sectional view of the lens 500. The object side surface 510 of the lens 500 has no transition point. For a lens surface without a transition point, such as the object side surface 510 of the lens 500, 0 to 50% of the distance from the optical axis I to the optical boundary OB of the lens surface is defined as the optical axis area, and 50 to 100% of the distance from the optical axis I to the optical boundary OB of the lens surface is defined as the circumferential area. Figure 5The lens 500 shown in the figure defines the optical axis region Z1 of the object side surface 510 as 50% of the distance from the optical axis I to the optical boundary OB of the lens 500 surface. The R value of the object side surface 510 is positive (i.e., R>0), so the optical axis region Z1 is a convex surface. Since the object side surface 510 of the lens 500 has no transition point, the circumferential region Z2 of the object side surface 510 is also a convex surface. The lens 500 may further have an assembly portion (not shown) extending radially outward from the circumferential region Z2.

[0117] like Figure 6 As shown, the optical imaging lens 1 of the present invention is mainly composed of four lenses along the optical axis I, from the object side A1 where the object (not shown) is placed to the image side A2 where the image is formed, including the first lens 10, the second lens 20, the aperture 80, the third lens 30, the fourth lens 40 and the image plane 91 in sequence. Generally speaking, the first lens 10, the second lens 20, the third lens 30 and the fourth lens 40 can be made of transparent plastic materials, but the present invention is not limited thereto. Each lens has an appropriate refractive power. In the optical imaging lens 1 of the present invention, there are only four lenses with refractive power, namely the first lens 10, the second lens 20, the third lens 30 and the fourth lens 40. 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.

[0118] In addition, the optical imaging lens 1 further includes an aperture stop 80, which is disposed at an appropriate position. Figure 6 In the embodiment of the present invention, the aperture 80 is disposed between the second lens 20 and the third lens 30. When light (not shown) emitted by the object to be photographed (not shown) located at the object side A1 enters the optical imaging lens 1 of the present invention, it will sequentially pass through the first lens 10, the second lens 20, the aperture 80, the third lens 30, the fourth lens 40 and the filter 90, and will be focused on the imaging surface 91 of the image side A2 to form a clear image. In various embodiments of the present invention, the filter 90 is disposed between the fourth lens 40 and the imaging surface 91, and it can be a filter with various suitable functions, for example, the filter 90 can be an infrared filter.

[0119] Each lens in the optical imaging lens 1 of the present invention has an object-side surface facing the object side A1 and allowing the imaging light to pass through, and an image-side surface facing the image side A2 and allowing the imaging light to pass through. In addition, each lens in the optical imaging lens 1 of the present invention also has an optical axis region and a circumferential region. For example, the first lens 10 has an object-side surface 11 and an image-side surface 12; the second lens 20 has an object-side surface 21 and an image-side surface 22; the third lens 30 has an object-side surface 31 and an image-side surface 32; and the fourth lens 40 has an object-side surface 41 and an image-side surface 42. Therefore, each object-side surface and image-side surface has an optical axis region and a circumferential region, respectively.

[0120] Each lens in the optical imaging lens 1 of the present invention also has a thickness T on the optical axis I. For example, the first lens 10 has a first lens thickness T1, the second lens 20 has a second lens thickness T2, the third lens 30 has a third lens thickness T3, and the fourth lens 40 has a fourth lens thickness T4. Therefore, the sum of the thicknesses of the lenses in the optical imaging lens 1 of the present invention on the optical axis I is called ALT. That is, ALT=T1+T2+T3+T4.

[0121] In addition, in the optical imaging lens 1 of the present invention, there is an air gap between each lens on the optical axis I. For example, the air gap between the first lens 10 and the second lens 20 is called G12, the air gap between the second lens 20 and the third lens 30 is called G23, and the air gap between the third lens 30 and the fourth lens 40 is called G34. Therefore, the sum of the three air gaps between each lens on the optical axis I from the first lens 10 to the fourth lens 40 is called AAG. That is, AAG = G12 + G23 + G34.

[0122] In addition, the distance between the object side surface 11 of the first lens 10 and the imaging surface 91 on the optical axis I is the system length TTL of the optical imaging lens 1. The system focal length of the optical imaging lens 1 is EFL, and the distance between the object side surface 11 of the first lens 10 and the image side surface 42 of the fourth lens 40 on the optical axis I is TL.

[0123] When the filter 90 is arranged between the fourth lens 40 and the imaging surface 91, G4F represents the air gap from the fourth lens 40 to the filter 90 on the optical axis I, TF represents the thickness of the filter 90 on the optical axis I, GFP represents the air gap from the filter 90 to the imaging surface 91 on the optical axis I, and BFL is the back focal length of the optical imaging lens 1, that is, the distance from the image side surface 42 of the fourth lens 40 to the imaging surface 91 on the optical axis I, that is, BFL=G4F+TF+GFP.

[0124] 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; 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; υ1 is the Abbe coefficient of the first lens 10; υ2 is the Abbe coefficient of the second lens 20; υ3 is the Abbe coefficient of the third lens 30; υ4 is the Abbe coefficient of the fourth lens 40; r1 is the effective radius of the object side surface of the first lens; r2 is the effective radius of the image side surface of the first lens; r3 is the effective radius of the object side surface of the second lens; r4 is the effective radius of the image side surface of the second lens; r5 is the effective radius of the object side surface of the third lens; r6 is the effective radius of the image side surface of the third lens; r7 is the effective radius of the object side surface of the fourth lens; and r8 is the effective radius of the image side surface of the fourth lens.

[0125] First embodiment

[0126] See also Figure 6 , illustrating the first embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the first embodiment on the imaging surface 91, please refer to Figure 7 A. For sagittal field curvature, please refer to Figure 7 For B and tangential field curvature, please refer to Figure 7 For C and distortion aberration, 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 system image height (Image Height, ImagH) of the first embodiment is in millimeters.

[0127] The optical imaging lens 1 of the first embodiment is mainly composed of four lenses having refractive powers, an aperture 80, and an imaging surface 91. The aperture 80 of the first embodiment is disposed between the second lens 20 and the third lens 30.

[0128] The first lens 10 has a positive refractive power. The optical axis region 13 of the object side surface 11 of the first lens 10 is a convex surface and the circumferential region 14 thereof is a convex surface, and the optical axis region 16 of the image side surface 12 of the first lens 10 is a convex surface and the circumferential region 17 thereof is a concave surface. Both the object side surface 11 and the image side surface 12 of the first lens 10 are aspherical surfaces, but the present invention is not limited thereto.

[0129] The second lens 20 has a negative refractive power. The optical axis region 23 of the object side surface 21 of the second lens 20 is a convex surface and the circumferential region 24 thereof is a convex surface, and the optical axis region 26 of the image side surface 22 of the second lens 20 is a concave surface and the circumferential region 27 thereof is a convex surface. Both the object side surface 21 and the image side surface 22 of the second lens 20 are aspherical surfaces, but the present invention is not limited thereto.

[0130] The third lens 30 has a negative refractive power, the optical axis region 33 of the object side surface 31 of the third lens 30 is a concave surface and the circumferential region 34 thereof is a concave surface, the optical axis region 36 of the image side surface 32 of the third lens 30 is a convex surface and the circumferential region 37 thereof is a concave surface. The object side surface 31 and the image side surface 32 of the third lens 30 are both aspherical surfaces, but the present invention is not limited thereto.

[0131] The fourth lens 40 has a positive refractive power, an optical axis region 43 of an object-side surface 41 of the fourth lens 40 is a convex surface and a circumferential region 44 thereof is a concave surface, an optical axis region 46 of an image-side surface 42 of the fourth lens 40 is a concave surface and a circumferential region 47 thereof is a convex surface. Both the object-side surface 41 and the image-side surface 42 of the fourth lens 40 are aspherical surfaces, but the present invention is not limited thereto.

[0132] In the optical imaging lens 1 of the present invention, from the first lens 10 to the fourth lens 40, all eight curved surfaces, namely, the object side surface 11 / 21 / 31 / 41 and the image side surface 12 / 22 / 32 / 42, are aspherical surfaces, but the present invention is not limited thereto. If they are aspherical surfaces, they are defined by the following formula:

[0133]

[0134] in:

[0135] Y represents the vertical distance between the point on the aspherical surface and the optical axis I;

[0136] Z represents the depth of the aspherical surface (the vertical distance between the point on the aspherical surface that is Y away from the optical axis I and the tangent plane that is tangent to the vertex on the aspherical surface on the optical axis I);

[0137] R represents the radius of curvature of the lens surface near the optical axis I;

[0138] K is the conic constant;

[0139] ai is the i-th order aspheric coefficient.

[0140] First Embodiment The optical data of the optical imaging lens system are as follows: Fig. 22 As shown, the aspheric data is as follows Fig.23As shown. In the optical imaging lens system of the following embodiments, the aperture value (f-number) of the overall optical imaging lens is Fno (the smaller the Fno value, the larger the aperture), the system focal length is (EFL), and the half field of view (Half Field of View, referred to as HFOV) is half of the maximum viewing angle (Field of View) in the overall optical imaging lens (the half field of view is smaller, and the magnification is larger), wherein the image height, curvature radius, effective radius, thickness and focal length of the optical imaging lens are all in millimeters (mm). In this embodiment, TTL = 9.335 mm; EFL = 9.333 mm; HFOV = 14.000 degrees; image height = 2.314 mm; Fno = 1.800.

[0141] Second embodiment

[0142] See also Figure 8 , illustrating the second embodiment of the optical imaging lens 1 of the present invention. Please note that starting from the second embodiment, in order to simplify and clearly express the diagram, only the optical axis area and the circumference area of ​​each lens with a different surface type from the first embodiment are specially marked on the figure, while the optical axis area and the circumference area of ​​the other surface types that are the same as the lens of the first embodiment, such as concave or convex surface, are not marked separately. For the longitudinal spherical aberration of the second embodiment on the imaging surface 91, please refer to Fig. 9 For A and sagittal field curvature aberration, please refer to Fig. 9 For B and field curvature aberration in the meridian direction, please refer to Fig. 9 For C and distortion, please refer to Fig. 9 The design of the second embodiment is similar to that of the first embodiment, except that only the lens refractive power, lens curvature radius, lens thickness, lens aspheric coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the circumferential area 24 of the object side surface 21 of the second lens 20 is a concave surface, the circumferential area 31 of the object side surface 31 of the third lens 30 is a convex surface 34, the circumferential area 44 of the object side surface 41 of the fourth lens 40 is a convex surface, and the circumferential area 47 of the image side surface 42 of the fourth lens 40 is a concave surface.

[0143] The detailed optical data of the second embodiment are as follows Fig.24 As shown, the aspheric data is as follows Fig.25As shown. In this embodiment, TTL = 12.801 mm; EFL = 9.009 mm; HFOV = 13.997 degrees; image height = 2.306 mm; Fno = 1.800. In particular: 1. The longitudinal spherical aberration of the second embodiment is smaller than that of the first embodiment; 2. The field curvature aberration in the sagittal direction of the second embodiment is smaller than that of the first embodiment; 3. The field curvature aberration in the meridional direction of the second embodiment is smaller than that of the first embodiment; 4. The distortion aberration of the second embodiment is smaller than that of the first embodiment; 5. The half field angle of the second embodiment is smaller than that of the first embodiment, so the magnification is larger; 6. The thickness difference between the optical axis and the circumferential area of ​​the lens of the second embodiment is smaller than that of the first embodiment, so it is easy to manufacture and has a higher yield.

[0144] Third embodiment

[0145] See also Fig.10 , illustrating the third embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the third embodiment on the imaging surface 91, please refer to Fig.11 For A and sagittal field curvature aberration, please refer to Fig.11 For B and field curvature aberration in the meridian direction, please refer to Fig.11 For C and distortion, please refer to Fig.11 The design of the third embodiment is similar to that of the first embodiment, except that only the lens refractive power, lens curvature radius, lens thickness, lens aspheric coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the circumferential area 27 of the image side surface 22 of the second lens 20 is a concave surface, the third lens has a positive refractive power, the circumferential area 34 of the object side surface 31 of the third lens 30 is a convex surface, the circumferential area 44 of the object side surface 41 of the fourth lens 40 is a convex surface, and the circumferential area 47 of the image side surface 42 of the fourth lens 40 is a concave surface.

[0146] The detailed optical data of the third embodiment are as follows Fig.26 As shown, the aspheric data is as follows Fig. 27 As shown, in this embodiment, TTL = 9.616 mm; EFL = 5.071 mm; HFOV = 13.996 degrees; image height = 1.262 mm; Fno = 1.800. In particular: 1. The longitudinal spherical aberration of the third embodiment is smaller than that of the first embodiment; 2. The field curvature aberration in the sagittal direction of the third embodiment is smaller than that of the first embodiment; 3. The field curvature aberration in the meridional direction of the third embodiment is smaller than that of the first embodiment; 4. The distortion aberration of the third embodiment is smaller than that of the first embodiment; 5. The half field angle of the third embodiment is smaller than that of the first embodiment, so the magnification is larger; 6. The thickness difference between the optical axis and the circumferential area of ​​the lens of the third embodiment is smaller than that of the first embodiment, so it is easy to manufacture and has a higher yield.

[0147] Fourth embodiment

[0148] See also Fig.12 , illustrating the fourth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the fourth embodiment on the imaging surface 91, please refer to Fig.13 For A and sagittal field curvature aberration, please refer to Fig.13 For B and field curvature aberration in the meridian direction, please refer to Fig.13 For C and distortion, please refer to Fig.13 The design of the fourth embodiment is similar to that of the first embodiment, except that only the lens refractive power, lens curvature radius, lens thickness, lens aspheric coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the circumferential area 17 of the image side surface 12 of the first lens 10 is convex, the circumferential area 24 of the object side surface 21 of the second lens 20 is concave, the circumferential area 27 of the image side surface 22 of the second lens 20 is concave, and the circumferential area 44 of the object side surface 41 of the fourth lens 40 is convex.

[0149] The detailed optical data of the fourth embodiment are as follows Fig.28 As shown, the aspheric data is as follows Fig.29 As shown. In this embodiment, TTL = 13.796 mm; EFL = 8.147 mm; HFOV = 13.996 degrees; image height = 2.062 mm; Fno = 1.800. In particular: 1. The longitudinal spherical aberration of the fourth embodiment is smaller than that of the first embodiment; 2. The field curvature aberration in the sagittal direction of the fourth embodiment is smaller than that of the first embodiment; 3. The field curvature aberration in the meridional direction of the fourth embodiment is smaller than that of the first embodiment; 4. The distortion aberration of the fourth embodiment is smaller than that of the first embodiment; 5. The half field angle of the fourth embodiment is smaller than that of the first embodiment, so the magnification is larger; 6. The thickness difference between the optical axis and the circumferential area of ​​the lens of the fourth embodiment is smaller than that of the first embodiment, so it is easy to manufacture and has a higher yield.

[0150] Fifth embodiment

[0151] See also Fig.14 , illustrating the fifth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the fifth embodiment on the imaging surface 91, please refer to Fig.15 For A and sagittal field curvature aberration, please refer to Fig.15 For B and field curvature aberration in the meridian direction, please refer to Fig.15 For C and distortion, please refer to Fig.15 The design of the fifth embodiment is similar to that of the first embodiment, except that only the lens refractive power, lens curvature radius, lens thickness, lens aspheric coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the circumferential area 27 of the image side surface 22 of the second lens 20 is a concave surface, and the circumferential area 44 of the object side surface 41 of the fourth lens 40 is a convex surface.

[0152] The detailed optical data of the fifth embodiment are as follows Fig.30 As shown, the aspheric data is as follows Fig.31 As shown, in this embodiment, TTL = 13.306 mm; EFL = 9.371 mm; HFOV = 13.998 degrees; image height = 2.358 mm; Fno = 1.800. In particular: 1. The longitudinal spherical aberration of the fifth embodiment is smaller than that of the first embodiment; 2. The distortion aberration of the fifth embodiment is smaller than that of the first embodiment; 3. The half field angle of the fifth embodiment is smaller than that of the first embodiment, and the system focal length is larger than that of the first embodiment, so the magnification is larger.

[0153] Sixth embodiment

[0154] See also Fig.16 , illustrating the sixth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the sixth embodiment on the imaging surface 91, please refer to Fig.17 For A and sagittal field curvature aberration, please refer to Fig.17 For B and field curvature aberration in the meridian direction, please refer to Fig.17 For C and distortion, please refer to Fig.17 The design of the sixth embodiment is similar to that of the first embodiment, except that only the lens refractive power, lens curvature radius, lens thickness, lens aspheric coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the circumferential area 44 of the object side surface 41 of the fourth lens 40 is a convex surface, and the circumferential area 47 of the image side surface 42 of the fourth lens 40 is a concave surface.

[0155] The detailed optical data of the sixth embodiment are as follows Fig.32 As shown, the aspheric data is as follows Fig.33 As shown, in this embodiment, TTL = 14.410 mm; EFL = 9.742 mm; HFOV = 13.996 degrees; image height = 2.453 mm; Fno = 1.800. In particular: 1. The longitudinal spherical aberration of the sixth embodiment is smaller than that of the first embodiment; 2. The field curvature aberration in the sagittal direction of the sixth embodiment is smaller than that of the first embodiment; 3. The field curvature aberration in the meridional direction of the sixth embodiment is smaller than that of the first embodiment; 4. The distortion aberration of the sixth embodiment is smaller than that of the first embodiment; 5. The half field angle of the sixth embodiment is smaller than that of the first embodiment, and the system focal length is larger than that of the first embodiment, so the magnification is larger; 6. The thickness difference between the optical axis and the circumferential area of ​​the lens of the sixth embodiment is smaller than that of the first embodiment, and it is easy to manufacture, so the yield is higher.

[0156] Seventh embodiment

[0157] See also Fig.18, illustrating the seventh embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the seventh embodiment on the imaging surface 91, please refer to Fig.19 For A and sagittal field curvature aberration, please refer to Fig.19 For B and field curvature aberration in the meridian direction, please refer to Fig.19 For C and distortion, please refer to Fig.19 The design of the seventh embodiment is similar to that of the first embodiment, except that only the lens refractive power, lens curvature radius, lens thickness, lens aspheric coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the circumferential area 17 of the image side surface 12 of the first lens 10 is convex, and the fourth lens 40 has a negative refractive power.

[0158] The detailed optical data of the seventh embodiment are as follows Fig.34 As shown, the aspheric data is as follows Fig.35 As shown, in this embodiment, TTL = 12.579 mm; EFL = 10.070 mm; HFOV = 14.000 degrees; image height = 2.564 mm; Fno = 1.800. In particular: 1. The longitudinal spherical aberration of the seventh embodiment is smaller than that of the first embodiment; 2. The distortion aberration of the seventh embodiment is smaller than that of the first embodiment; 3. The system focal length of the seventh embodiment is larger than that of the first embodiment, so the magnification is larger; 4. The thickness difference between the optical axis and the circumferential area of ​​the lens of the seventh embodiment is smaller than that of the first embodiment, which is easy to manufacture and thus has a higher yield.

[0159] Eighth embodiment

[0160] See also Fig. 20 , illustrating the eighth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the eighth embodiment on the imaging surface 91, please refer to Fig.21 For A and sagittal field curvature aberration, please refer to Fig.21 For B and field curvature aberration in the meridian direction, please refer to Fig.21 For C and distortion, please refer to Fig.21 The design of the eighth embodiment is similar to that of the first embodiment, except that only the lens refractive power, lens curvature radius, lens thickness, lens aspheric coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the circumferential area 27 of the image side surface 22 of the second lens 20 is a concave surface, the circumferential area of ​​the object side surface 31 of the third lens 30 is a convex surface 34, and the circumferential area 47 of the image side surface 42 of the fourth lens 40 is a concave surface.

[0161] The detailed optical data of the eighth embodiment are as follows Fig.36 As shown, the aspheric data is as follows Fig.37As shown, in this embodiment, TTL = 9.150 mm; EFL = 9.149 mm; HFOV = 12.802 degrees; image height = 2.185 mm; Fno = 1.8. In particular: 1. The system length TTL of the eighth embodiment is shorter than that of the first embodiment; 2. The longitudinal spherical aberration of the eighth embodiment is smaller than that of the first embodiment; 3. The field curvature aberration in the sagittal direction of the eighth embodiment is smaller than that of the first embodiment; 4. The field curvature aberration in the tangential direction of the eighth embodiment is smaller than that of the first embodiment; 5. The half field angle of the eighth embodiment is smaller than that of the first embodiment, so the magnification is larger.

[0162] In addition, the important parameters of each embodiment are summarized in Fig.38 and Fig.39 middle.

[0163] The configuration of the optical axis area of ​​the image-side surface of the fourth lens element can be a concave surface. If it is combined with one of the following surface shapes and conditional combinations (a) to (c), it is beneficial to increase the focal length of the system while reducing the aperture value and maintaining a certain image quality:

[0164] (a) The optical axis area of ​​the image side of the first lens is convex, the aperture is located between the second lens and the third lens, and HFOV / TTL≦1.500° / mm;

[0165] (b) the first lens has a positive refractive power, an aperture located between the second lens and the third lens, and HFOV ≤ 15.000°;

[0166] (c) The optical axis region of the image side surface of the first lens is convex, the second lens has a negative refractive power, the optical axis region of the object side surface of the third lens is concave, the circumferential region of the image side surface of the third lens is concave, and HFOV / TTL≦1.500° / mm.

[0167] In addition, the first lens has a positive refractive power, the optical axis region of the image side surface of the third lens is a convex surface, the optical axis region of the image side surface of the fourth lens is a concave surface, the aperture is arranged between the second lens and the third lens, and one of the following restrictions is combined, for example: the optical axis region of the image side surface of the first lens is a convex surface, the third lens has a negative refractive power or the circumferential region of the image side surface of the third lens is a concave surface, which is conducive to reducing distortion aberration;

[0168] The aperture is located between the second lens and the third lens, HFOV≦15.000°, and one of the following restrictions is used, for example: the third lens has a negative refractive power, the optical axis area of ​​the object side of the third lens is a concave surface, or the fourth lens has a positive refractive power, which is beneficial to maintaining the image quality;

[0169] The first lens has a positive refractive power, the aperture is located between the second lens and the third lens, the HFOV is less than or equal to 15.000°, and one of the following restrictions is met, for example: the optical axis region of the object side surface of the second lens is a convex surface, the circumferential region of the object side surface of the second lens is a convex surface, the optical axis region of the object side surface of the fourth lens is a convex surface, the circumferential region of the object side surface of the fourth lens is a convex surface, or the optical axis region of the image side surface of the fourth lens is a concave surface, which is conducive to reducing the field curvature aberration;

[0170] The optical axis area of ​​the image side surface of the first lens is convex, the optical axis area of ​​the object side surface of the third lens is concave, the circumferential area of ​​the image side surface of the third lens is concave, and HFOV≦15.000°, combined with one of the following restrictions, for example: the optical axis area of ​​the image side surface of the third lens is convex, the optical axis area of ​​the image side surface of the fourth lens is concave, or the circumferential area of ​​the image side surface of the fourth lens is concave, is conducive to reducing longitudinal spherical aberration;

[0171] The second lens has a negative refractive power, the third lens has a negative refractive power, the optical axis area of ​​the image side surface of the third lens is a convex surface, the circumferential area of ​​the image side surface of the third lens is a concave surface, and the circumferential area of ​​the image side surface of the fourth lens is a concave surface, which is conducive to reducing distortion;

[0172] The optical axis region of the image side surface of the first lens is convex, the second lens has a negative refractive power, the optical axis region of the object side surface of the third lens is concave, the circumferential region of the image side surface of the third lens is concave, and the circumferential region of the image side surface of the fourth lens is concave. In combination with one of the following restrictions, for example, the optical axis region of the object side surface of the second lens is convex, the circumferential region of the object side surface of the second lens is convex, or the third lens has a negative refractive power, etc., the same effect can be achieved.

[0173] The optical imaging lens of the present invention further satisfies at least one of the following conditions, so that the thickness and interval of each lens can be maintained at an appropriate value, thereby preventing any parameter from being too large and thus being disadvantageous for the overall thinning of the optical imaging lens of the present invention.

[0174] a) In order to maintain the imaging quality and improve the assembly and manufacturing yield, the present invention appropriately adjusts the lens thickness and the air gap between the lenses. However, considering the difficulty of the lens assembly process and the imaging quality, the lens thickness and the air gap between the lenses need to be coordinated with each other. Therefore, under the condition that the numerical limits of the following conditional formula are met, the optical imaging system can achieve a better configuration.

[0175] HFOV / TTL≦1.500° / mm, the optimal range is between 0.850 and 1.500.

[0176] TTL / AAG≧10.000, the optimal range is between 10.000 and 19.100; and when the range is between 10.000 and 19.100, the distortion aberration and field curvature aberration may be significantly improved; when the range is between 10.000 and 17.800, the longitudinal spherical aberration may be significantly improved; and when the range is between 12.500 and 19.100, the longitudinal spherical aberration may also be significantly improved.

[0177] (T1+G12+T2) / AAG≧3.000, the optimal range is between 3.000 and 5.850; and when the range is between 3.000 and 5.850, the distortion aberration and field curvature aberration may be significantly improved; and when the range is between 3.000 and 4.500, the longitudinal spherical aberration may be significantly improved.

[0178] (T2+T4) / (T1+T3)≧0.750, and the optimal range is between 0.750 and 2.400.

[0179] T4 / (G12+G23)≧1.500, the optimal range is between 1.500 and 6.800; and when the range is between 1.500 and 6.800, the distortion aberration and field curvature aberration may be significantly improved; and when the range is between 2.500 and 6.800, the longitudinal spherical aberration may be significantly improved.

[0180] TL / AAG≧7.000, the optimal range is between 7.000 and 12.500.

[0181] T4 / (T1+AAG)≧0.350, the optimal range is between 0.350 and 2.200; and when the range is between 0.350 and 2.200, the distortion aberration and field curvature aberration may be significantly improved; and when the range is between 0.800 and 2.200, the longitudinal spherical aberration may be significantly improved.

[0182] Fno*TTL / ALT≦5.000, the optimal range is between 2.500 and 5.000; and when the range is between 2.500 and 4.000, the distortion aberration and field curvature aberration may be significantly improved; and when the range is between 2.500 and 5.000, the longitudinal spherical aberration may be significantly improved.

[0183] ALT / AAG≧6.900, the optimal range is between 6.900 and 11.400.

[0184] (T4+BFL) / T1≧3.000, the optimal range is between 3.000 and 6.200.

[0185] (T2+T4) / (G12+G23)≧4.500, the optimal range is between 4.500 and 9.000.

[0186] (G34+TL) / (T1+T3)≦3.500, the optimal range is between 1.800 and 3.500; and when the range is between 1.800 and 3.500, the distortion aberration and field curvature aberration may be significantly improved; and when the range is between 2.600 and 3.500, the longitudinal spherical aberration may be significantly improved.

[0187] ALT / (T1+G34)≧3.000, the optimal range is between 3.000 and 5.900.

[0188] TTL / (T2+G23+T3)≧3.500, the optimal range is between 3.500 and 7.450.

[0189] TL / (G12+T2+G23)≧3.000, the optimal range is between 3.000 and 5.700; and when the range is between 3.000 and 4.900, the distortion aberration and field curvature aberration may be significantly improved; and when the range is between 3.000 and 5.700, the longitudinal spherical aberration may be significantly improved.

[0190] BFL / (T3+G34)≧3.000, the optimal range is between 3.000 and 10.600; and when the range is between 3.000 and 10.600, the distortion aberration and field curvature aberration may be significantly improved; when the range is between 3.000 and 7.000, the longitudinal spherical aberration may be significantly improved; when the range is between 3.000 and 4.000, the longitudinal spherical aberration may also be significantly improved.

[0191] TTL / (T1+G12+T3)≧3.000, the optimal range is between 3.000 and 5.450.

[0192] TTL / BFL≦3.500, the optimal range is between 1.750 and 3.500.

[0193] (T1+T2) / (G12+T3+G34)≧1.500, the optimal range is between 1.500 and 6.300; and when the range is between 1.500 and 6.300, the distortion aberration and field curvature aberration may be significantly improved; and when the range is between 1.500 and 3.000, the longitudinal spherical aberration may be significantly improved.

[0194] b) Adjusting the EFL helps improve the optical zoom ratio. If the following conditions are met, the optical zoom ratio can also be improved during the process of thinning the optical system.

[0195] HFOV / EFL≦3.000° / mm, the optimal range is between 1.250 and 3.000; and when the range is between 1.250 and 3.000, the distortion aberration and field curvature aberration may be significantly improved; and when the range is between 1.250 and 1.900, the longitudinal spherical aberration may be significantly improved.

[0196] (T3+EFL) / BFL≧1.500, the optimal range is between 1.500 and 2.850; and when the range is between 1.500 and 2.850, the distortion aberration and field curvature aberration may be significantly improved; and when the range is between 2.000 and 2.850, the longitudinal spherical aberration may be significantly improved.

[0197] (TTL+EFL) / ALT≦4.500, the optimal range is between 2.200 and 4.500.

[0198] Fno*EFL / BFL≦4.500, the optimal range is between 2.200 and 4.500; and when the range is between 2.200 and 4.500, the distortion aberration and field curvature aberration may be significantly improved; and when the range is between 2.900 and 4.500, the longitudinal spherical aberration may be significantly improved.

[0199] EFL / TTL≦1.000, the optimal range is between 0.500 and 1.000.

[0200] (EFL+T4) / (AAG+T1)≧3.000, the optimal range is between 3.000 and 6.400.

[0201] EFL / ALT≦2.500, the optimal range is between 0.750 and 2.500; and when the range is between 0.750 and 2.500, the distortion aberration and field curvature aberration may be significantly improved; and when the range is between 0.900 and 2.500, the longitudinal spherical aberration may be significantly improved.

[0202] EFL / (T1+G12)≦6.000, the optimal range is between 2.350 and 6.000; and when the range is between 2.350 and 6.000, the distortion aberration and field curvature aberration may be significantly improved; and when the range is between 2.900 and 6.000, the longitudinal spherical aberration may be significantly improved.

[0203] (EFL+BFL) / ALT≦2.800, the optimal range is between 1.150 and 2.800.

[0204] c) Adjusting the effective radius of the lens so that the aperture is located between the second lens and the third lens helps to reduce the aperture value, reduce the volume and improve the aberration of the optical lens system. If the following conditional formula is met, the distortion aberration, field curvature aberration or longitudinal spherical aberration can be effectively improved.

[0205] r1 / r6≧1.100, the optimal range is between 1.100 and 2.000;

[0206] r1 / r8≧1.150, the optimal range is between 1.150 and 1.800;

[0207] r3 / r6≧1.000, the optimal range is between 1.000 and 1.500;

[0208] r3 / r8≧0.900, the optimal range is between 0.900 and 1.600;

[0209] (r1+r3) / r6≧2.200, the optimal range is between 2.200 and 3.300;

[0210] (r1+r3) / r8≧2.000, the optimal range is between 2.000 and 3.400.

[0211] d) When any of the following judgment formulas is met, the clarity of the local imaging of the object can be enhanced and the aberration of the local imaging of the object can be effectively corrected.

[0212] υ1+υ2≧2*υ3;

[0213] υ1+υ2≧2*υ4;

[0214] υ2+υ3≦2*υ4;

[0215] υ1+υ2+υ3≦3*υ4;

[0216] υ1+υ3+υ4≦3*υ2.

[0217] In addition, any combination of parameters of the embodiment may be selected to increase lens restrictions, so as to facilitate the lens design of the same structure of the present invention.

[0218] In view of the unpredictability of optical system design, under the framework of the present invention, meeting the above conditions can better shorten the length of the telephoto lens of the present invention, increase the aperture, improve the imaging quality, or improve the assembly yield, thereby improving the shortcomings of the prior art.

[0219] The numerical ranges obtained by the combination ratio relationship of the optical parameters disclosed in each embodiment of the present invention, including the maximum and minimum values, can be implemented accordingly.

[0220] 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 a first lens, a second lens, a third lens, and a fourth lens in order from an object side to an image side along an optical axis, wherein each of the first lens to the fourth lens comprises an object-side surface facing the object side and through which imaging light passes, and an image-side surface facing the image side and through which imaging light passes, characterized in that: The optical imaging lens includes: The first lens has a positive refractive power, an optical axis region of the object side surface of the first lens is a convex surface, a circumferential region of the object side surface of the first lens is a convex surface, and an optical axis region of the image side surface of the first lens is a convex surface; The second lens has a negative refractive power, an optical axis region of the object side surface of the second lens is a convex surface, and an optical axis region of the image side surface of the second lens is a concave surface; An optical axis region of the object side surface of the third lens is a concave surface, an optical axis region of the image side surface of the third lens is a convex surface, and a circumferential region of the image side surface of the third lens is a concave surface; An optical axis region of the object-side surface of the fourth lens is a convex surface, and an optical axis region of the image-side surface of the fourth lens is a concave surface; The thickness of the fourth lens on the optical axis is greater than the air gap between the second lens and the third lens on the optical axis; The optical imaging lens has only the above four lenses; and the optical imaging lens satisfies the following conditions: HFOV≦15.000°, TTL / AAG≧10.000 and TTL / BFL≦3.500, HFOV is the half field of view of the optical imaging lens, TTL is the distance from the object side of the first lens to an imaging plane on the optical axis, AAG is the sum of three air gaps from the first lens to the fourth lens on the optical axis, and BFL is the distance from the image side of the fourth lens to the imaging plane on the optical axis.

2. The optical imaging lens according to claim 1, wherein: T1 is the thickness of the first lens on the optical axis, T4 is the thickness of the fourth lens on the optical axis, and the optical imaging lens meets the following characteristics: 3.000≦(T4+BFL) / T1.

3. The optical imaging lens according to claim 1, wherein: EFL is the system focal length of the optical imaging lens, T1 is the thickness of the first lens on the optical axis, T4 is the thickness of the fourth lens on the optical axis, and the optical imaging lens meets the following characteristics: 3.000≦(EFL+T4) / (AAG+T1).

4. The optical imaging lens according to claim 1, wherein: T3 is the thickness of the third lens on the optical axis, G34 is the air gap between the third lens and the fourth lens on the optical axis, and the optical imaging lens meets the following characteristics: 3.000≦BFL / (T3+G34).

5. The optical imaging lens according to claim 1, wherein: T1 is the thickness of the first lens on the optical axis, T2 is the thickness of the second lens on the optical axis, G12 is the air gap between the first lens and the second lens on the optical axis, and the optical imaging lens meets its characteristics: (T1+G12+T2) / AAG≧3.

000.

6. The optical imaging lens according to claim 1, wherein: The optical imaging lens meets the following characteristics: HFOV / TTL≦1.500° / mm.

7. The optical imaging lens according to claim 1, wherein: EFL is defined as the system focal length of the optical imaging lens, and the optical imaging lens meets its characteristics: EFL / TTL≦1.

000.

8. The optical imaging lens according to claim 1, wherein: T2 is the thickness of the second lens on the optical axis, T3 is the thickness of the third lens on the optical axis, G23 is the air gap between the second lens and the third lens on the optical axis, and the optical imaging lens meets its characteristics: 3.500≦TTL / (T2+G23+T3).

9. The optical imaging lens according to claim 1, wherein: T1 is the thickness of the first lens on the optical axis, T3 is the thickness of the third lens on the optical axis, G12 is the air gap between the first lens and the second lens on the optical axis, and the optical imaging lens meets its characteristics: 3.000≦TTL / (T1+G12+T3).

10. The optical imaging lens according to claim 1, wherein: T1 is the thickness of the first lens on the optical axis, T2 is the thickness of the second lens on the optical axis, T3 is the thickness of the third lens on the optical axis, G12 is the air gap between the first lens and the second lens on the optical axis, G34 is the air gap between the third lens and the fourth lens on the optical axis, and the optical imaging lens meets its characteristics: 1.500≦(T1+T2) / (G12+T3+G34).

11. The optical imaging lens according to claim 1, wherein: T4 is the thickness of the fourth lens on the optical axis, G12 is the air gap between the first lens and the second lens on the optical axis, G23 is the air gap between the second lens and the third lens on the optical axis, and the optical imaging lens meets its characteristics: T4 / (G12+G23)≧1.

500.

12. The optical imaging lens according to claim 1, wherein: T2 is the thickness of the second lens on the optical axis, T4 is the thickness of the fourth lens on the optical axis, G12 is the air gap between the first lens and the second lens on the optical axis, G23 is the air gap between the second lens and the third lens on the optical axis, and the optical imaging lens meets its characteristics: 4.500≦(T2+T4) / (G12+G23).

13. The optical imaging lens according to claim 1, wherein: TL is the distance from the object side surface of the first lens to the image side surface of the fourth lens on the optical axis, T2 is the thickness of the second lens on the optical axis, G12 is the air gap between the first lens and the second lens on the optical axis, G23 is the air gap between the second lens and the third lens on the optical axis, and the optical imaging lens meets its characteristics: 3.000≦TL / (G12+T2+G23).

14. The optical imaging lens according to claim 1, wherein: TL is the distance from the object side surface of the first lens to the image side surface of the fourth lens on the optical axis, T1 is the thickness of the first lens on the optical axis, T3 is the thickness of the third lens on the optical axis, G34 is the air gap between the third lens and the fourth lens on the optical axis, and the optical imaging lens meets its characteristics: (G34+TL) / (T1+T3)≦3.

500.

15. The optical imaging lens according to claim 1, wherein: r1 is the effective radius of the object side surface of the first lens, r3 is the effective radius of the object side surface of the second lens, r6 is the effective radius of the image side surface of the third lens, and the optical imaging lens meets its characteristics: (r1+r3) / r6≧2.200。 16. The optical imaging lens according to claim 1, wherein: υ1 is the Abbe number of the first lens, υ2 is the Abbe number of the second lens, υ3 is the Abbe number of the third lens, and the optical imaging lens satisfies its characteristics: υ1+υ2≧2*υ3.

Images