An 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 along the optical axis from the object side to the image side. The first lens to the fourth lens each include 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. The optical axis area of ​​the object side surface of the first lens is a convex surface. The second lens is a glass lens. The third lens has a negative refractive power. The optical axis area of ​​the image side surface of the fourth lens is a convex surface. The optical imaging lens has only the above four lenses and satisfies the following conditional formulas: HFOV / TTL≧15.000 degrees / mm and 0.500≦︱RLGmin︱ / TG. The optical imaging lens can provide a smaller size when the manufacturing tolerance allows, and also improves the manufacturing yield at the same time, and has the advantages of good thermal stability, good imaging quality and a large field of view.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging, and in particular to an optical imaging lens. Background Art

[0002] In recent years, optical imaging lenses have been evolving. In addition to requiring lenses to be thin, light, and short, it is becoming increasingly important to improve the imaging quality of lenses such as aberration and chromatic aberration. However, the design of optical imaging lenses is not simply to scale down lenses with good imaging quality to produce optical lenses that have both imaging quality and miniaturization. The design process not only involves the lens surface shape, lens thickness, or air gaps between lenses, but also must consider practical production issues such as manufacturing and assembly yield. Especially for small-sized lenses, slight size variations will affect the imaging quality of the entire optical system. In addition, temperature differences may cause the focus position of the optical imaging lens to shift, thereby affecting the imaging quality. In order to cope with more diversified applications, optical imaging lenses need to maintain good thermal stability when used in different temperature environments. If the lens material is glass, it will certainly help improve thermal stability, but in order to meet the requirements of miniaturization, the size of the glass lens cannot be too large. General glass grinding technology often makes the size tolerance of the glass lens too large when manufacturing small-sized glass lenses, resulting in low manufacturing yield. Therefore, how to design a miniaturized lens with good thermal stability, good imaging quality and a large field of view becomes a challenge and a problem that needs to be solved urgently. Summary of the invention

[0003] The present invention provides an optical imaging lens, which can provide a smaller size when manufacturing tolerances allow, and the optical imaging lens of the present invention also improves the manufacturing yield, has good thermal stability, good imaging quality and a large field of view.

[0004] An embodiment of the present invention provides 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. The first lens to the fourth lens each include an object side surface facing the object side and allowing imaging light to pass through, and an image side surface facing the image side and allowing imaging light to pass through. The first lens has a negative refractive power and the optical axis region of the object side surface of the first lens is a convex surface. The second lens is a glass lens. The third lens has a negative refractive power. The second lens has a positive refractive power or the fourth lens has a positive refractive power. The optical imaging lens has only the above four lenses and satisfies the following conditional formula: HFOV / TTL≧15.000 degrees / mm and 0.500≦︱RLGmin︱ / TG, wherein HFOV is the half viewing angle of the optical imaging lens, TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, RLGmin is the smaller radius of curvature of the absolute value of the radius of curvature of the object side surface and the image side surface of the glass lens of the optical imaging lens, and TG is the thickness of the glass lens on the optical axis.

[0005] An embodiment of the present invention provides 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. The first lens to the fourth lens each include an object side surface facing the object side and allowing imaging light to pass through, and an image side surface facing the image side and allowing imaging light to pass through. The optical axis area of ​​the object side surface of the first lens is a convex surface. The first lens has a negative refractive power or the second lens has a positive refractive power. The second lens is a glass lens. The circumferential area of ​​the object side surface of the third lens is a concave surface. The optical imaging lens has only the above four lenses and satisfies the following conditional formulas: HFOV / TTL≧15.000 degrees / mm and 0.500≦︱RLGmin︱ / TG, wherein HFOV is the half viewing angle of the optical imaging lens, TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, RLGmin is the smaller radius of curvature of the absolute value of the radius of curvature of the object side surface and the image side surface of the glass lens of the optical imaging lens, and TG is the thickness of the glass lens on the optical axis.

[0006] An embodiment of the present invention provides 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. The first lens to the fourth lens each include an object side surface facing the object side and allowing imaging light to pass through, and an image side surface facing the image side and allowing imaging light to pass through. The optical axis region of the object side surface of the first lens is a convex surface, and the circumferential region of the image side surface of the first lens is a concave surface. The first lens has a negative refractive power or the second lens has a positive refractive power. The second lens is a glass lens. The optical imaging lens has only the above four lenses and satisfies the following conditional formula: HFOV / TTL≧15.000 degrees / mm and 0.500≦︱RLGmin︱ / TG, wherein HFOV is the half viewing angle of the optical imaging lens, TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, RLGmin is the smaller radius of curvature of the absolute value of the radius of curvature of the object side surface and the image side surface of the glass lens of the optical imaging lens, and TG is the thickness of the glass lens on the optical axis.

[0007] In the optical imaging lens of the present invention, the embodiment may further selectively meet the following conditions:

[0008] ALT / (T2+G23)≧2.600,

[0009] BFL / (T3+G34)≧2.000,

[0010] TL / (EFL+AAG)≧1.200,

[0011] (G12+T4) / T3≧2.500,

[0012] HFOV / (TL*Fno)≧15.000 degrees / mm,

[0013] (EFL+T4) / (G12+G23)≧4.900,

[0014] T4 / T1≧2.000,

[0015] (T2+T3+T4) / EFL≧1.000,

[0016] BFL / AAG≧2.400,

[0017] T4 / G12≦4.500,

[0018] (V1+V2+V3) / V4≦3.000,

[0019] TTL / (G12+T2+T4)≦2.800,

[0020] ImgH / (G12+G23)≧2.400,

[0021] (T3+BFL) / T4≦2.300,

[0022] (T2+T4) / T3≧3.500,

[0023] G12 / (G23+G34)≧1.500,

[0024] T2 / G12≦3.100.

[0025] Where ALT is the sum of the thicknesses of the four lenses from the first lens to the fourth lens on the optical axis, BFL is the distance from the image side of the fourth lens to the imaging surface on the optical axis, TL is the distance from the object side of the first lens to the image side of the fourth lens on the optical axis, EFL is the focal length of the optical imaging lens, AAG is the sum of the three air gaps from the first lens to the fourth lens on the optical axis, Fno is the aperture value of the optical imaging lens, and ImgH is the image height of the optical imaging lens.

[0026] 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, and T4 is the thickness of the fourth lens on the optical axis.

[0027] 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, G34 is the air gap between the third lens and the fourth lens on the optical axis,

[0028] V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens, V3 is the Abbe number of the third lens, and V4 is the Abbe number of the fourth lens.

[0029] Based on the above, the beneficial effect of the optical imaging lens of the embodiment of the present invention is that by satisfying the above-mentioned concave and convex surface arrangement design of the lens, the refractive index conditions and the design satisfying the above-mentioned conditional formula, the optical imaging lens can have a smaller size when the manufacturing tolerance allows. The optical imaging lens also improves the manufacturing yield, has good thermal stability, has good imaging quality and has a large field of view. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram illustrating the surface structure of a lens.

[0031] Figure 2 It is a schematic diagram illustrating the concave-convex structure of a lens surface and the focus of light.

[0032] Figure 3 is a schematic diagram illustrating the surface structure of a lens of Example 1.

[0033] Figure 4is a schematic diagram illustrating the surface structure of a lens of Example 2.

[0034] Figure 5 is a schematic diagram illustrating the surface structure of a lens of Example 3.

[0035] Figure 6 It is a schematic diagram of an optical imaging lens according to a first embodiment of the present invention.

[0036] Figure 7 Graphs showing longitudinal spherical aberration and various aberrations of the optical imaging lens of the first embodiment.

[0037] Figure 8 It is a table diagram of detailed optical data of the optical imaging lens of the first embodiment of the present invention.

[0038] Fig. 9 It is a table diagram of aspherical parameters of the optical imaging lens according to the first embodiment of the present invention.

[0039] Fig.10 FIG. 4 is a schematic diagram of an optical imaging lens according to a second embodiment of the present invention.

[0040] Fig.11 Graphs showing longitudinal spherical aberration and various aberrations of the optical imaging lens of the second embodiment.

[0041] Fig.12 Detailed optical data table of the optical imaging lens according to the second embodiment of the present invention.

[0042] Fig.13 It is a table diagram of aspherical parameters of the optical imaging lens according to the second embodiment of the present invention.

[0043] Fig.14 FIG. 4 is a schematic diagram of an optical imaging lens according to a third embodiment of the present invention.

[0044] Fig.15 Graphs showing longitudinal spherical aberration and various aberrations of the optical imaging lens of the third embodiment.

[0045] Fig.16 Detailed optical data table of the optical imaging lens according to the third embodiment of the present invention.

[0046] Fig.17 It is a table diagram of aspherical parameters of the optical imaging lens according to the third embodiment of the present invention.

[0047] Fig.18 FIG. 4 is a schematic diagram of an optical imaging lens according to a fourth embodiment of the present invention.

[0048] Fig.19 Graphs showing longitudinal spherical aberration and various aberrations of the optical imaging lens of the fourth embodiment.

[0049] Fig. 20 Detailed optical data table of the optical imaging lens according to the fourth embodiment of the present invention.

[0050] Fig.21 It is a table diagram of aspherical parameters of the optical imaging lens according to the fourth embodiment of the present invention.

[0051] Fig. 22 FIG. 4 is a schematic diagram of an optical imaging lens according to a fifth embodiment of the present invention.

[0052] Fig.23 Graphs showing longitudinal spherical aberration and various aberrations of the optical imaging lens of the fifth embodiment.

[0053] Fig.24 Detailed optical data table of the optical imaging lens according to the fifth embodiment of the present invention.

[0054] Fig.25 It is a table diagram of aspherical parameters of the optical imaging lens according to the fifth embodiment of the present invention.

[0055] Fig.26 FIG. 4 is a schematic diagram of an optical imaging lens according to a sixth embodiment of the present invention.

[0056] Fig. 27 Graphs showing longitudinal spherical aberration and various aberrations of the optical imaging lens of the sixth embodiment.

[0057] Fig.28 Detailed optical data table of the optical imaging lens according to the sixth embodiment of the present invention.

[0058] Fig.29 It is a table diagram of aspherical parameters of the optical imaging lens according to the sixth embodiment of the present invention.

[0059] Fig.30 FIG. 4 is a schematic diagram of an optical imaging lens according to a seventh embodiment of the present invention.

[0060] Fig.31 Graphs showing longitudinal spherical aberration and various aberrations of the optical imaging lens of the seventh embodiment.

[0061] Fig.32 Detailed optical data table of the optical imaging lens according to the seventh embodiment of the present invention.

[0062] Fig.33 It is a table diagram of aspherical parameters of the optical imaging lens according to the seventh embodiment of the present invention.

[0063] Fig.34 is a schematic diagram of an optical imaging lens according to an eighth embodiment of the present invention.

[0064] Fig.35Graphs showing longitudinal spherical aberration and various aberrations of the optical imaging lens of the eighth embodiment.

[0065] Fig.36 Detailed optical data table of the optical imaging lens according to the eighth embodiment of the present invention.

[0066] Fig.37 It is a table diagram of aspherical parameters of the optical imaging lens according to the eighth embodiment of the present invention.

[0067] Fig.38 is a schematic diagram of an optical imaging lens according to a ninth embodiment of the present invention.

[0068] Fig.39 Graphs showing longitudinal spherical aberration and various aberrations of the optical imaging lens of the ninth embodiment.

[0069] Fig.40 Detailed optical data table of the optical imaging lens of the ninth embodiment of the present invention.

[0070] Fig.41 It is a table diagram of aspherical parameters of the optical imaging lens according to the ninth embodiment of the present invention.

[0071] Fig.42 FIG. 1 is a schematic diagram of an optical imaging lens according to a tenth embodiment of the present invention.

[0072] Fig.43 Graphs showing longitudinal spherical aberration and various aberrations of the optical imaging lens of the tenth embodiment.

[0073] Fig.44 Detailed optical data table of the optical imaging lens according to the tenth embodiment of the present invention.

[0074] Fig.45 It is a table diagram of aspherical parameters of the optical imaging lens according to the tenth embodiment of the present invention.

[0075] Figure 46 to Figure 49 It is a numerical table diagram of important parameters and their relationship equations of the optical imaging lenses of the first to tenth embodiments of the present invention. DETAILED DESCRIPTION

[0076] Before describing the present invention in detail, the symbols in the accompanying drawings are first clearly indicated: 0: aperture; 1: first lens; 2: second lens; 3: third lens; 4: fourth lens; 10: optical imaging lens; 11, 21, 31, 41, 110, 410, 510, F1: object side; 12, 22, 32, 42, 120, 320, F2: image side; 99: imaging surface; 100, 200, 300, 400, 500: lenses; 130: assembly unit; 113, 123, 213, 223, 313, 320 23, 413, 423, Z1: optical axis area; 114, 124, 214, 224, 314, 324, 414, 424, Z2: circular area; 211, 212: parallel light rays; A1: object side; A2: image side; CP: center point; CP1: first center point; CP2: second center point; EL: extension line; F: filter; I: optical axis; Lm: marginal light; Lc: main light; M, R: intersection point; OB: optical boundary; TP1: first transition point; TP2: second transition point; Z3: relay area.

[0077] The terms "optical axis region", "circumferential region", "concave surface" and "convex surface" used in this specification and the claims should be interpreted based on the definitions listed in this specification.

[0078] The optical system 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 (HFOV) angle relative to the optical axis. The imaging light is imaged 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 1 The 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.

[0079] 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 1As shown in the example, the first center point CP1 is located on the object side 110 of the lens 100, and the second center point CP2 is located on the image side 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 with 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 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).

[0080] 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 further 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.

[0081] 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.

[0082] 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 element (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.

[0083] 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 2As 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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 5 The 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.

[0091] Figure 6 is a schematic diagram of an optical imaging lens according to a first embodiment of the present invention, and Figure 7 A to Figure 7 D is the longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the first embodiment. Please refer to Figure 6 The optical imaging lens 10 of the first embodiment of the present invention includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4 and a filter F in order from the object side A1 to the image side A2 along an optical axis I of the optical imaging lens 10, wherein an aperture O is disposed between the first lens 1 and the second lens 2. When light emitted by an object to be photographed enters the optical imaging lens 10 and passes through the first lens 1, the aperture O, the second lens 2, the third lens 3, the fourth lens 4 and the filter F, an image is formed on an image plane 99. The filter F is disposed between the image side surface 42 of the fourth lens 4 and the image plane 99. It is additionally explained that the object side A1 is a side facing the object to be photographed, and the image side A2 is a side facing the image plane 99. In one embodiment, the filter F may be an IR cut filter, but the present invention is not limited thereto.

[0092] In this embodiment, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4 and the filter F of the optical imaging lens 10 each have an object-side surface 11, 21, 31, 41, F1 facing the object side A1 and allowing imaging light to pass therethrough, and an image-side surface 12, 22, 32, 42, F2 facing the image side A2 and allowing imaging light to pass therethrough.

[0093] The first lens 1 has a negative refractive power. The material of the first lens 1 can be plastic, but the present invention is not limited to this. The optical axis area 113 of the object side surface 11 of the first lens 1 is a convex surface, and its circumferential area 114 is a convex surface. The optical axis area 123 of the image side surface 12 of the first lens 1 is a concave surface, and its circumferential area 124 is a concave surface. In the present embodiment, the object side surface 11 and the image side surface 12 of the first lens 1 are both aspheric surfaces, but the present invention is not limited to this.

[0094] The second lens 2 has a positive refractive power. The material of the second lens 2 may be glass, but the present invention is not limited thereto. The optical axis region 213 of the object side surface 21 of the second lens 2 is a convex surface, and its circumferential region 214 is a convex surface. The optical axis region 223 of the image side surface 22 of the second lens 2 is a plane, and its circumferential region 224 is a plane. In the present embodiment, the object side surface 21 of the second lens 2 is a spherical surface, but the present invention is not limited thereto.

[0095] The third lens 3 has a negative refractive power. The material of the third lens 3 may be plastic, but the present invention is not limited thereto. The optical axis region 313 of the object side surface 31 of the third lens 3 is a convex surface, and its circumferential region 314 is a convex surface. The optical axis region 323 of the image side surface 32 of the third lens 3 is a concave surface, and its circumferential region 324 is a concave surface. In the present embodiment, both the object side surface 31 and the image side surface 32 of the third lens 3 are aspherical surfaces, but the present invention is not limited thereto.

[0096] The fourth lens 4 has a positive refractive power. The material of the fourth lens 4 can be plastic, but the present invention is not limited thereto. The optical axis region 413 of the object side surface 41 of the fourth lens 4 is a convex surface, and its circumferential region 414 is a convex surface. The optical axis region 423 of the image side surface 42 of the fourth lens 4 is a convex surface, and its circumferential region 424 is a convex surface. In the present embodiment, the object side surface 41 and the image side surface 42 of the fourth lens 4 are both aspherical surfaces, but the present invention is not limited thereto.

[0097] In this embodiment, the optical imaging lens system 10 only includes the four lenses mentioned above.

[0098] Other detailed optical data of the first embodiment are as follows Figure 8 As shown, the effective focal length (EFL) of the optical imaging lens 10 of the first embodiment is 0.622 millimeters (mm), the half field of view (HFOV) is 50.000 degrees, the aperture value (F-number, Fno) is 2.000, the system length is 1.574 mm, and the image height is 0.500 mm, wherein the system length refers to the distance from the object side surface 11 of the first lens 1 to the imaging surface 99 on the optical axis I.

[0099] In addition, in this embodiment, the object-side surfaces 11, 31, 41 and the image-side surfaces 12, 32, 42 of the first lens 1, the third lens 3 and the fourth lens 4 are all aspherical surfaces, wherein the object-side surfaces 11, 31, 41 and the image-side surfaces 12, 32, 42 are general even asphere surfaces. These aspherical surfaces are defined according to the following formulas:

[0100]

[0101] Where: R: radius of curvature of the lens surface near the optical axis I; Z: 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 tangent to the vertex on the aspheric optical axis I); Y: distance between the point on the aspheric curve and the optical axis I; K: conic constant; a 2i : 2i-th order aspheric coefficient.

[0102] The aspheric coefficients of the various items from the object side surface 11 of the first lens 1 to the image side surface 42 of the fourth lens 4 in formula (1) are as follows: Fig. 9 As shown. Among them, Fig. 9 The column number 11 in the middle represents the aspheric coefficient of the object side surface 11 of the first lens 1, and the same applies to the other columns. In this embodiment and the following embodiments, the second-order aspheric coefficient a2 is 0.

[0103] In addition, the relationship between the important parameters of the optical imaging lens 10 of the first embodiment is as follows: Fig.46 As shown, where the unit of HFOV is degree, Fno has no unit, and the unit of the remaining parameters is millimeter.

[0104] in,

[0105] f1 is the focal length of the first lens 1; f2 is the focal length of the second lens 2; f3 is the focal length of the third lens 3; f4 is the focal length of the fourth lens 4;

[0106] n1 is the refractive index of the first lens 1; n2 is the refractive index of the second lens 2; n3 is the refractive index of the third lens 3; n4 is the refractive index of the fourth lens 4;

[0107] V1 is the Abbe number of the first lens 1, which can also be called the dispersion coefficient; V2 is the Abbe number of the second lens 2; V3 is the Abbe number of the third lens 3; V4 is the Abbe number of the fourth lens 4;

[0108] T1 is the thickness of the first lens 1 on the optical axis I; T2 is the thickness of the second lens 2 on the optical axis I; T3 is the thickness of the third lens 3 on the optical axis I; T4 is the thickness of the fourth lens 4 on the optical axis I;

[0109] G12 is the air gap between the first lens 1 and the second lens 2 on the optical axis I, and is also the distance from the image side surface 12 of the first lens 1 to the object side surface 21 of the second lens 2 on the optical axis I;

[0110] G23 is the air gap between the second lens 2 and the third lens 3 on the optical axis I, and is also the distance from the image side surface 22 of the second lens 2 to the object side surface 31 of the third lens 3 on the optical axis I;

[0111] G34 is the air gap between the third lens 3 and the fourth lens 4 on the optical axis I, and is also the distance from the image side surface 32 of the third lens 3 to the object side surface 41 of the fourth lens 4 on the optical axis I;

[0112] G4F is the air gap between the fourth lens 4 and the filter F on the optical axis I, and is also the distance from the image side surface 42 of the fourth lens 4 to the object side surface F1 of the filter F on the optical axis I;

[0113] TF is the thickness of the filter F on the optical axis I;

[0114] GFP is the air gap between the filter F and the imaging surface 99 on the optical axis I, and is also the distance from the image side surface F2 of the filter F to the imaging surface 99 on the optical axis I;

[0115] AAG is the sum of three air gaps between the first lens 1 to the fourth lens 4 on the optical axis I, that is, the sum of air gaps G12, G23 and G34;

[0116] ALT is the sum of the thicknesses of the four lenses from the first lens 1 to the fourth lens 4 on the optical axis I, that is, the sum of the thicknesses T1, T2, T3 and T4;

[0117] EFL is the effective focal length of the optical imaging lens 10;

[0118] BFL is the distance from the image side surface 42 of the fourth lens 4 to the imaging surface 99 on the optical axis I;

[0119] TTL is the distance from the object side surface 11 of the first lens 1 to the imaging surface 99 on the optical axis I;

[0120] TL is the distance between the object side surface 11 of the first lens 1 and the image side surface 42 of the fourth lens 4 on the optical axis I;

[0121] HFOV is the half viewing angle of the optical imaging lens 10;

[0122] ImgH is the image height of the optical imaging lens 10; and

[0123] Fno is the aperture value of the optical imaging lens 10 .

[0124] In addition, define:

[0125] RLGmin is the smaller radius of curvature of the object side surface and the image side surface of the glass lens of the optical imaging lens 10. For example, if the second lens 2 is a glass lens, RLGmin is the smaller radius of curvature of the object side surface 21 and the image side surface 22 of the second lens 2; and

[0126] TG is the thickness of the glass lens on the optical axis I. For example, if the second lens 2 is a glass lens, TG is the thickness of the second lens 2 on the optical axis I.

[0127] Also refer to Figure 7 A to Figure 7 D, Figure 7 The diagram of A illustrates the longitudinal spherical aberration (Longitudinal Spherical Aberration) of the first embodiment. Figure 7 B and Figure 7The diagrams of C respectively illustrate the field curvature aberration in the sagittal direction and the field curvature aberration in the tangential direction on the imaging surface 99 of the first embodiment when the wavelength is 470nm, 555nm and 650nm. Figure 7 The diagram of D illustrates the distortion aberration of the first embodiment on the imaging surface 99 when the wavelength is 470nm, 555nm and 650nm. The longitudinal spherical aberration of the first embodiment is as follows: Figure 7 As shown in A, the curves formed by each wavelength are very close and close to the middle, indicating that the off-axis light rays of different heights of each wavelength are concentrated near the imaging point. It can be seen from the deflection amplitude of the curve of each wavelength that the imaging point deviation of the off-axis light rays of different heights is controlled within the range of ±14 microns (μm). Therefore, the first embodiment does significantly improve the spherical aberration of the same wavelength. In addition, the distances between the three representative wavelengths are also very close to each other, representing that the imaging positions of the light rays of different wavelengths are already very concentrated, thereby significantly improving the chromatic aberration.

[0128] exist Figure 7 B and Figure 7 In the two field curvature aberration diagrams of C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±45 microns, indicating that the optical system of the first embodiment can effectively eliminate aberrations. Figure 7 The distortion diagram of D shows that the distortion of the first embodiment is maintained within the range of ±35%, indicating that the distortion of the first embodiment meets the imaging quality requirements of the optical system. It is thus shown that compared with the existing optical lens, the first embodiment can still provide good imaging quality under the condition that the system length has been shortened to 1.574 mm, so the first embodiment can have a smaller size if the manufacturing tolerance allows. The first embodiment also improves the manufacturing yield, has good imaging quality, and has a large field of view.

[0129] In addition, the first embodiment also has good thermal stability. For example, the normal temperature is set at 20°C, and the focal shift at this temperature is 0.0000 mm. In addition, the focal shift at 0°C is 0.0005 mm, and the focal shift at 60°C is -0.0005 mm.

[0130] Fig.10 is a schematic diagram of an optical imaging lens according to a second embodiment of the present invention, and Fig.11 A to Fig.11 D is the longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the second embodiment. Please refer to Fig.10, a second embodiment of the optical imaging lens 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows: the optical data, aspheric coefficients and parameters between these lenses 1, 2, 3 and 4 are more or less different. In addition, in this embodiment, the material of the second lens 2 may be plastic, the optical axis area 223 of the image side surface 22 of the second lens 2 is a convex surface, and its circumferential area 224 is a convex surface. The object side surface 21 and the image side surface 22 of the second lens 2 are both aspheric surfaces. The optical axis area 313 of the object side surface 31 of the third lens 3 is a concave surface, and its circumferential area 314 is a concave surface. The material of the fourth lens 4 may be glass, the optical axis area 413 of the object side surface 41 of the fourth lens 4 is a plane, and its circumferential area 414 is a plane. The image side surface 42 of the fourth lens 4 is a spherical surface. It should be noted here that in order to clearly display the drawings, Fig.10 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0131] Detailed optical data of the optical imaging lens 10 of the second embodiment are as follows: Fig.12 As shown, the effective focal length of the optical imaging lens 10 of the second embodiment is 0.657 mm, the half field of view (HFOV) is 50.000 degrees, the aperture value (Fno) is 2.000, the system length is 1.882 mm, and the image height is 0.452 mm.

[0132] The aspheric coefficients of the various items in formula (1) from the object side surface 11 of the first lens 1 to the image side surface 32 of the third lens 3 in the second embodiment are as follows: Fig.13 shown.

[0133] In addition, the relationship between the important parameters of the optical imaging lens 10 of the second embodiment is as follows: Fig.46 shown.

[0134] The longitudinal spherical aberration of the second embodiment is as follows: Fig.11 As shown in A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±7 microns. Fig.11 B and Fig.11 In the two field curvature aberration diagrams of C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±20 microns. Fig.11 The distortion diagram of D shows that the distortion of the second embodiment is maintained within the range of ±45%.

[0135] The second embodiment also has good thermal stability. For example, when the normal temperature is set at 20°C, the focus shift at this temperature is 0.0000 mm. In addition, the focus shift at 0°C is -0.0005 mm, and the focus shift at 60°C is 0.0020 mm.

[0136] It can be seen from the above description that the longitudinal spherical aberration and field curvature aberration of the second embodiment are better than those of the first embodiment.

[0137] Fig.14 is a schematic diagram of an optical imaging lens according to a third embodiment of the present invention, and Fig.15 A to Fig.15 D is the longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the third embodiment. Fig.14 , a third embodiment of the optical imaging lens 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows: the optical data, aspheric coefficients and parameters between these lenses 1, 2, 3 and 4 are more or less different. In addition, in this embodiment, the optical axis area 213 of the object side surface 21 of the second lens 2 is a plane, and its circumferential area 214 is a plane. The optical axis area 223 of the image side surface 22 of the second lens 2 is a convex surface, and its circumferential area 224 is a convex surface. The image side surface 22 of the second lens 2 is a spherical surface. The optical axis area 313 of the object side surface 31 of the third lens 3 is a concave surface, and its circumferential area 314 is a concave surface. The circumferential area 324 of the image side surface 32 of the third lens 3 is a convex surface. The optical axis area 413 of the object side surface 41 of the fourth lens 4 is a concave surface. It should be noted here that in order to clearly display the drawings, Fig.14 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0138] Detailed optical data of the optical imaging lens 10 of the third embodiment are as follows: Fig.16 As shown, the effective focal length of the optical imaging lens 10 of the third embodiment is 0.295 mm, the half field of view (HFOV) is 50.000 degrees, the aperture value (Fno) is 2.000, the system length is 1.837 mm, and the image height is 0.494 mm.

[0139] The aspheric coefficients of the various items in formula (1) from the object side surface 11 of the first lens 1 to the image side surface 42 of the fourth lens 4 in the third embodiment are as follows: Fig.17 shown.

[0140] In addition, the relationship between the important parameters of the optical imaging lens 10 of the third embodiment is as follows: Fig.46 shown.

[0141] The longitudinal spherical aberration of the third embodiment is as follows: Fig.15 As shown in A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±9 microns. Fig.15 B and Fig.15 In the two field curvature aberration diagrams of C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±180 microns. Fig.15 The distortion diagram of D shows that the distortion of the third embodiment is maintained within the range of ±40%.

[0142] The third embodiment also has good thermal stability. For example, when the normal temperature is set at 20°C, the focus shift at this temperature is 0.0000 mm. In addition, the focus shift at 0°C is 0.0005 mm, and the focus shift at 60°C is -0.0010 mm.

[0143] It can be seen from the above description that the longitudinal spherical aberration of the third embodiment is better than that of the first embodiment.

[0144] Fig.18 is a schematic diagram of an optical imaging lens according to a fourth embodiment of the present invention, and Fig.19 A to Fig.19 D is the longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the fourth embodiment. Please refer to Fig.18 , a fourth embodiment of the optical imaging lens 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows: the optical data, aspheric coefficients and parameters between these lenses 1, 2, 3 and 4 are more or less different. In addition, in this embodiment, the optical axis area 213 of the object side surface 21 of the second lens 2 is a plane, and its circumferential area 214 is a plane. The optical axis area 223 of the image side surface 22 of the second lens 2 is a convex surface, and its circumferential area 224 is a convex surface. The image side surface 22 of the second lens 2 is a spherical surface. The optical axis area 313 of the object side surface 31 of the third lens 3 is a concave surface, and its circumferential area 314 is a concave surface. The circumferential area 324 of the image side surface 32 of the third lens 3 is a convex surface. It should be noted here that in order to clearly display the drawings, Fig.18 The reference numerals of some optical axis areas and circumferential areas having similar surface shapes to those of the first embodiment are omitted.

[0145] Detailed optical data of the optical imaging lens 10 of the fourth embodiment are as follows: Fig. 20 As shown, the effective focal length of the optical imaging lens 10 of the fourth embodiment is 0.615 mm, the half field of view (HFOV) is 45.000 degrees, the aperture value (Fno) is 1.800, the system length is 2.978 mm, and the image height is 0.504 mm.

[0146] The aspheric coefficients of the various items in formula (1) from the object side surface 11 of the first lens 1 to the image side surface 42 of the fourth lens 4 in the fourth embodiment are as follows: Fig.21 shown.

[0147] In addition, the relationship between the important parameters of the optical imaging lens 10 of the fourth embodiment is as follows: Fig.46 shown.

[0148] The longitudinal spherical aberration of the fourth embodiment is as follows: Fig.19 As shown in A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±25 microns. Fig.19 B and Fig.19 In the two field curvature aberration diagrams of C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±50 microns. Fig.19 The distortion diagram of D shows that the distortion of the fourth embodiment is maintained within the range of ±18%.

[0149] The fourth embodiment also has good thermal stability. For example, when the normal temperature is set at 20°C, the focus shift at this temperature is 0.0000 mm. In addition, the focus shift at 0°C is 0.0035 mm, and the focus shift at 60°C is -0.0060 mm.

[0150] From the above description, it can be known that the aperture value of the fourth embodiment is smaller than that of the first embodiment. In addition, the distortion aberration of the fourth embodiment is better than that of the first embodiment.

[0151] Fig. 22 is a schematic diagram of an optical imaging lens according to a fifth embodiment of the present invention, and Fig.23 A to Fig.23 D is the longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the fifth embodiment. Fig. 22 , a fifth embodiment of the optical imaging lens 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows: the optical data, aspheric coefficients and parameters between these lenses 1, 2, 3 and 4 are more or less different. In addition, in this embodiment, the optical axis area 213 of the object side surface 21 of the second lens 2 is a plane, and its circumferential area 214 is a plane. The optical axis area 223 of the image side surface 22 of the second lens 2 is a convex surface, and its circumferential area 224 is a convex surface. The image side surface 22 of the second lens 2 is a spherical surface. The optical axis area 313 of the object side surface 31 of the third lens 3 is a concave surface, and its circumferential area 314 is a concave surface. It should be noted here that in order to clearly display the drawings, Fig. 22 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0152] Detailed optical data of the optical imaging lens 10 of the fifth embodiment are as follows: Fig.24 As shown, the effective focal length of the optical imaging lens 10 of the fifth embodiment is 0.511 mm, the half field of view (HFOV) is 50.000 degrees, the aperture value (Fno) is 2.000, the system length is 2.276 mm, and the image height is 0.500 mm.

[0153] The aspheric coefficients of the various items in formula (1) from the object side surface 11 of the first lens 1 to the image side surface 42 of the fourth lens 4 in the fifth embodiment are as follows: Fig.25 shown.

[0154] In addition, the relationship between the important parameters of the optical imaging lens 10 of the fifth embodiment is as follows: Fig.46 shown.

[0155] The longitudinal spherical aberration of the fifth embodiment is as follows: Fig.23 As shown in A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±6 microns. Fig.23 B and Fig.23 In the two field curvature aberration diagrams of C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±25 microns. Fig.23 The distortion diagram of D shows that the distortion of the fifth embodiment is maintained within the range of ±18%.

[0156] The fifth embodiment also has good thermal stability. For example, when the normal temperature is set at 20°C, the focus shift at this temperature is 0.0000 mm. In addition, the focus shift at 0°C is 0.0020 mm, and the focus shift at 60°C is -0.0045 mm.

[0157] It can be seen from the above description that the longitudinal spherical aberration, field curvature aberration and distortion aberration of the fifth embodiment are better than those of the first embodiment.

[0158] Fig.26 is a schematic diagram of an optical imaging lens according to a sixth embodiment of the present invention, and Fig. 27 A to Fig. 27 D is the longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the sixth embodiment. Please refer to Fig.26 , a sixth embodiment of the optical imaging lens 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows: the optical data, aspheric coefficients and parameters between these lenses 1, 2, 3 and 4 are more or less different. In addition, in this embodiment, the circumferential area 114 of the object side surface 11 of the first lens 1 is a concave surface. The optical axis area 213 of the object side surface 21 of the second lens 2 is a concave surface, and its circumferential area 214 is a concave surface. The optical axis area 223 of the image side surface 22 of the second lens 2 is a convex surface, and its circumferential area 224 is a convex surface. The image side surface 22 of the second lens 2 is a spherical surface. The circumferential area 314 of the object side surface 31 of the third lens 3 is a concave surface, and the circumferential area 324 of the image side surface 32 is a convex surface. It should be noted here that in order to clearly display the drawings, Fig.26 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0159] Detailed optical data of the optical imaging lens 10 of the sixth embodiment are as follows: Fig.28As shown, the effective focal length of the optical imaging lens 10 of the sixth embodiment is 0.601 mm, the half field of view (HFOV) is 50.000 degrees, the aperture value (Fno) is 2.000, the system length is 1.702 mm, and the image height is 0.445 mm.

[0160] The aspheric coefficients of the various items in formula (1) from the object side surface 11 of the first lens 1 to the image side surface 42 of the fourth lens 4 in the sixth embodiment are as follows: Fig.29 shown.

[0161] In addition, the relationship between the important parameters of the optical imaging lens 10 of the sixth embodiment is as follows: Fig.47 As shown, where the unit of HFOV is degree, Fno has no unit, and the unit of the remaining parameters is millimeter.

[0162] The longitudinal spherical aberration of the sixth embodiment is as follows: Fig. 27 As shown in A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±30 microns. Fig. 27 B and Fig. 27 In the two field curvature aberration diagrams of C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±60 microns. Fig. 27 The distortion diagram of D shows that the distortion of the sixth embodiment is maintained within the range of ±40%.

[0163] The sixth embodiment also has good thermal stability. For example, when the normal temperature is set at 20°C, the focus shift at this temperature is 0.0000 mm. In addition, the focus shift at 0°C is 0.0000 mm, and the focus shift at 60°C is -0.0005 mm.

[0164] It can be seen from the above description that the thickness difference between the optical axis area 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 and thus has a higher yield.

[0165] Fig.30 is a schematic diagram of an optical imaging lens according to a seventh embodiment of the present invention, and Fig.31 A to Fig.31 D is the longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the seventh embodiment. Please refer to Fig.30, a seventh embodiment of the optical imaging lens 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows: the optical data, aspheric coefficients and parameters between these lenses 1, 2, 3 and 4 are more or less different. In addition, in this embodiment, the optical axis area 213 of the object side surface 21 of the second lens 2 is a plane, and its circumferential area 214 is a plane. The optical axis area 223 of the image side surface 22 of the second lens 2 is a convex surface, and its circumferential area 224 is a convex surface. The image side surface 22 of the second lens 2 is a spherical surface. The circumferential area 314 of the object side surface 31 of the third lens 3 is a concave surface, and the circumferential area 324 of the image side surface 32 is a convex surface. The circumferential area 414 of the object side surface 41 of the fourth lens 4 is a concave surface. It should be noted here that in order to clearly display the drawings, Fig.30 The reference numerals of some optical axis areas and circumferential areas having similar surface shapes to those of the first embodiment are omitted.

[0166] Detailed optical data of the optical imaging lens 10 of the seventh embodiment are as follows: Fig.32 As shown, the effective focal length of the optical imaging lens 10 of the seventh embodiment is 0.481 mm, the half field of view (HFOV) is 50.000 degrees, the aperture value (Fno) is 2.000, the system length is 1.599 mm, and the image height is 0.440 mm.

[0167] The aspheric coefficients of the various items in formula (1) from the object side surface 11 of the first lens 1 to the image side surface 42 of the fourth lens 4 in the seventh embodiment are as follows: Fig.33 shown.

[0168] In addition, the relationship between the important parameters of the optical imaging lens 10 of the seventh embodiment is as follows: Fig.47 shown.

[0169] The longitudinal spherical aberration of the seventh embodiment is as follows: Fig.31 As shown in A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±12 microns. Fig.31 B and Fig.31 In the two field curvature aberration diagrams of C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±25 microns. Fig.31 The distortion diagram of D shows that the distortion of the seventh embodiment is maintained within the range of ±25%.

[0170] The seventh embodiment also has good thermal stability. For example, when the normal temperature is set at 20°C, the focus shift at this temperature is 0.0000 mm. In addition, the focus shift at 0°C is 0.0030 mm, and the focus shift at 60°C is -0.0065 mm.

[0171] It can be seen from the above description that the longitudinal spherical aberration, field curvature aberration and distortion aberration of the seventh embodiment are better than those of the first embodiment.

[0172] Fig.34 is a schematic diagram of an optical imaging lens according to an eighth embodiment of the present invention, and Fig.35 A to Fig.35 D is the longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the eighth embodiment. Please refer to Fig.34 , an eighth embodiment of the optical imaging lens 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows: the optical data, aspheric coefficients and parameters between these lenses 1, 2, 3 and 4 are more or less different. In addition, in this embodiment, the optical axis area 213 of the object side surface 21 of the second lens 2 is a plane, and its circumferential area 214 is a plane. The optical axis area 223 of the image side surface 22 of the second lens 2 is a convex surface, and its circumferential area 224 is a convex surface. The image side surface 22 of the second lens 2 is a spherical surface. The circumferential area 314 of the object side surface 31 of the third lens 3 is a concave surface. It should be noted here that in order to clearly display the drawings, Fig.34 The reference numerals of some optical axis areas and circumferential areas having similar surface shapes to those of the first embodiment are omitted.

[0173] Detailed optical data of the optical imaging lens 10 of the eighth embodiment are as follows: Fig.36 As shown, the effective focal length of the optical imaging lens 10 of the eighth embodiment is 0.473 mm, the half field of view (HFOV) is 50.000 degrees, the aperture value (Fno) is 2.000, the system length is 1.673 mm, and the image height is 0.440 mm.

[0174] The aspheric coefficients of the various items in formula (1) from the object side surface 11 of the first lens 1 to the image side surface 42 of the fourth lens 4 in the eighth embodiment are as follows: Fig.37 shown.

[0175] In addition, the relationship between the important parameters of the optical imaging lens 10 of the eighth embodiment is as follows: Fig.47 shown.

[0176] The longitudinal spherical aberration of the eighth embodiment is as follows: Fig.35 As shown in A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±2 microns. Fig.35 B and Fig.35 In the two field curvature aberration diagrams of C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±18 microns. Fig.35 The distortion diagram of D shows that the distortion of the eighth embodiment is maintained within the range of ±25%.

[0177] The eighth embodiment also has good thermal stability. For example, when the normal temperature is set at 20°C, the focus shift at this temperature is 0.0000 mm. In addition, the focus shift at 0°C is 0.0015 mm, and the focus shift at 60°C is -0.0035 mm.

[0178] It can be seen from the above description that the longitudinal spherical aberration, field curvature aberration and distortion aberration of the eighth embodiment are better than those of the first embodiment.

[0179] Fig.38 is a schematic diagram of an optical imaging lens according to a ninth embodiment of the present invention, and Fig.39 A to Fig.39 D is the longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the ninth embodiment. Fig.38 , a ninth embodiment of the optical imaging lens 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows: the optical data, aspheric coefficients and parameters between these lenses 1, 2, 3 and 4 are more or less different. In addition, in this embodiment, the optical axis area 213 of the object side surface 21 of the second lens 2 is a plane, and its circumferential area 214 is a plane. The optical axis area 223 of the image side surface 22 of the second lens 2 is a convex surface, and its circumferential area 224 is a convex surface. The image side surface 22 of the second lens 2 is a spherical surface. The optical axis area 313 of the object side surface 31 of the third lens 3 is a concave surface, and its circumferential area 314 is a concave surface. The circumferential area 324 of the image side surface 32 of the third lens 3 is a convex surface. It should be noted here that in order to clearly display the drawings, Fig.38 The reference numerals of some optical axis areas and circumferential areas having similar surface shapes to those of the first embodiment are omitted.

[0180] Detailed optical data of the optical imaging lens 10 of the ninth embodiment are as follows: Fig.40 As shown, the effective focal length of the optical imaging lens 10 of the ninth embodiment is 0.557 mm, the half field of view (HFOV) is 50.000 degrees, the aperture value (Fno) is 2.000, the system length is 1.702 mm, and the image height is 0.439 mm.

[0181] The aspheric coefficients of the various items in formula (1) from the object side surface 11 of the first lens 1 to the image side surface 42 of the fourth lens 4 in the ninth embodiment are as follows: Fig.41 shown.

[0182] In addition, the relationship between the important parameters of the optical imaging lens 10 of the ninth embodiment is as follows: Fig.47 shown.

[0183] The longitudinal spherical aberration of the ninth embodiment is as follows: Fig.39 As shown in A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±18 microns. Fig.39 B and Fig.39 In the two field curvature aberration diagrams of C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±25 microns. Fig.39 The distortion diagram of D shows that the distortion of the ninth embodiment is maintained within the range of ±35%.

[0184] The ninth embodiment also has good thermal stability. For example, when the normal temperature is set at 20°C, the focus shift at this temperature is 0.0000 mm. In addition, the focus shift at 0°C is 0.0030 mm, and the focus shift at 60°C is -0.0055 mm.

[0185] It can be seen from the above description that the field curvature aberration of the ninth embodiment is better than that of the first embodiment.

[0186] Fig.42 is a schematic diagram of an optical imaging lens according to a tenth embodiment of the present invention, and Fig.43 A to Fig.43 D is the longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the tenth embodiment. Fig.42 , a tenth embodiment of the optical imaging lens 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows: the optical data, aspheric coefficients and parameters between these lenses 1, 2, 3 and 4 are more or less different. In addition, in this embodiment, the optical axis area 223 of the image side surface 22 of the second lens 2 is a convex surface, and its circumferential area 224 is a convex surface. The image side surface 22 of the second lens 2 is a spherical surface. The optical axis area 313 of the object side surface 31 of the third lens 3 is a concave surface, and its circumferential area 314 is a concave surface. The optical axis area 323 of the image side surface 32 of the third lens 3 is a convex surface, and its circumferential area 324 is a convex surface. The optical axis area 413 of the object side surface 41 of the fourth lens 4 is a concave surface. It should be noted here that in order to clearly display the drawings, Fig.42 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0187] Detailed optical data of the optical imaging lens 10 of the tenth embodiment are as follows: Fig.44 As shown, the effective focal length of the optical imaging lens 10 of the tenth embodiment is 0.509 mm, the half field of view (HFOV) is 50.000 degrees, the aperture value (Fno) is 2.000, the system length is 1.663 mm, and the image height is 0.414 mm.

[0188] The aspheric coefficients of the various items in formula (1) from the object side surface 11 of the first lens 1 to the image side surface 42 of the fourth lens 4 in the tenth embodiment are as follows: Fig.45 shown.

[0189] In addition, the relationship between the important parameters of the optical imaging lens 10 of the tenth embodiment is as follows: Fig.47 shown.

[0190] The longitudinal spherical aberration of the tenth embodiment is as follows: Fig.43 As shown in A, the imaging point deviation of off-axis light at different heights is controlled within the range of ±45 microns. Fig.43 B and Fig.43 In the two field curvature aberration diagrams of C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±45 microns. Fig.43 The distortion diagram of D shows that the distortion of the tenth embodiment is maintained within the range of ±35%.

[0191] The tenth embodiment also has good thermal stability. For example, when the normal temperature is set at 20°C, the focus shift at this temperature is 0.0000 mm. In addition, the focus shift at 0°C is 0.0035 mm, and the focus shift at 60°C is -0.0070 mm.

[0192] Also refer to Figure 46 to Figure 49 , Figure 46 to Figure 49 It is a table diagram of various optical parameters of the first embodiment to the tenth embodiment.

[0193] In addition, when the lens material of the optical imaging lens 10 meets the following configuration relationship, the chromatic aberration is effectively improved.

[0194] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is satisfied: (V1+V2+V3) / V4≦3.000, wherein a preferred range is 1.700≦(V1+V2+V3) / V4≦3.000.

[0195] When the optical imaging lens 10 meets the following configuration relationship, the field of view angle can be enlarged, the system length can be shortened, and the aperture value can be reduced to increase the amount of light passing through.

[0196] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: HFOV / (TL*Fno)≧15.000 degrees / mm, wherein a preferred range is 15.000 degrees / mm≦HFOV / (TL*Fno)≦30.000 degrees / mm.

[0197] When the optical imaging lens 10 meets the following configuration relationship, the image height can be increased, and the imaging quality and manufacturing yield can be improved.

[0198] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: ImgH / (G12+G23)≧2.400, wherein a preferred range is 2.400≦ImgH / (G12+G23)≦5.000.

[0199] In addition, in order to shorten the system length of the optical imaging lens 10, the air gap between the lenses or the lens thickness can be adjusted appropriately, but the difficulty of manufacturing and the need to ensure the imaging quality must also be considered. Therefore, if the numerical limits of the following conditional formula are met, the embodiment of the present invention can have a better configuration.

[0200] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: ALT / (T2+G23)≧2.600, wherein a preferred range is 2.600≦ALT / (T2+G23)≦5.000.

[0201] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: BFL / (T3+G34)≧2.000, wherein a preferred range is 2.000≦BFL / (T3+G34)≦5.500.

[0202] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: TL / (EFL+AAG)≧1.200, wherein a preferred range is 1.200≦TL / (EFL+AAG)≦4.000.

[0203] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: (G12+T4) / T3≧2.500, wherein a preferred range is 2.500≦(G12+T4) / T3≦6.000.

[0204] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: (EFL+T4) / (G12+G23)≧4.900, wherein a preferred range is 4.900≦(EFL+T4) / (G12+G23)≦10.500.

[0205] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: T4 / T1≧2.000, wherein a preferred range is 2.000≦T4 / T1≦9.000.

[0206] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: (T2+T3+T4) / EFL≧1.000, wherein a preferred range is 1.000≦(T2+T3+T4) / EFL≦6.000.

[0207] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: BFL / AAG≧2.400, wherein a preferred range is 2.400≦BFL / AAG≦7.800.

[0208] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: T4 / G12≦4.500, wherein a preferred range is 2.200≦T4 / G12≦4.500.

[0209] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: TTL / (G12+T2+T4)≦2.800, wherein a preferred range is 1.500≦TTL / (G12+T2+T4)≦2.800.

[0210] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: (T3+BFL) / T4≦2.300, wherein a preferred range is 1.000≦(T3+BFL) / T4≦2.300.

[0211] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: (T2+T4) / T3≧3.500, wherein a preferred range is 3.500≦(T2+T4) / T3≦6.800.

[0212] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: G12 / (G23+G34)≧1.500, wherein a preferred range is 1.500≦G12 / (G23+G34)≦9.000.

[0213] In the optical imaging lens 10 of the embodiment of the present invention, the following condition is further satisfied: T2 / G12≦3.100, wherein a preferred range is 1.500≦T2 / G12≦3.100.

[0214] The exemplary limiting relationships listed above can also be selectively combined in different quantities and applied to the implementation of the present invention, and are not limited thereto. When implementing the present invention, in addition to the aforementioned relationships, other detailed structures such as the arrangement of concave and convex surfaces of other lenses can also be designed for a single lens or for multiple lenses in a broad sense to enhance the control of system performance and / or resolution. It should be noted that these details need to be selectively combined and applied to other embodiments of the present invention without conflict.

[0215] In summary, the optical imaging lens 10 of the embodiment of the present invention can achieve the following effects and advantages:

[0216] 1. The longitudinal spherical aberration, field curvature aberration, and distortion of each embodiment of the present invention all meet the use specifications. In addition, the off-axis light rays of the three representative wavelengths of red, green, and blue at different heights are all concentrated near the imaging point. From the deflection amplitude of each curve, it can be seen that the imaging point deviations of the off-axis light rays at different heights are all controlled and have good spherical aberration, aberration, and distortion suppression capabilities. Further referring to the imaging quality data, the distances between the three representative wavelengths of red, green, and blue are also quite close to each other, indicating that the present invention has good concentration of light rays of different wavelengths under various conditions and has excellent dispersion suppression capabilities. In summary, the present invention can produce excellent imaging quality through the design and mutual matching of the lenses.

[0217] 2. The optical imaging lens of the embodiment of the present invention satisfies the following combination, which is conducive to reducing the size of the lens and expanding the field of view at the same time: the optical axis area of ​​the object side of the first lens is designed to be convex, and HFOV / TTL≧15.000 degrees / mm, wherein the preferred range is 15.000 degrees / mm≦HFOV / TTL≦35.000 degrees / mm. When the third lens is designed to have a negative refractive power, and the optical axis area of ​​the image side of the fourth lens is designed to be convex, the aberration of the optical system can be effectively corrected and the distortion can be reduced. When the second lens is designed to be a glass lens, the thermal stability of the optical imaging lens can be improved. In addition, when the size of the glass lens of the optical imaging lens is designed to meet 0.500≦︱RLGmin︱ / TG, the manufacturing yield of the micro lens can be improved, and the optical imaging lens has good imaging quality, wherein the preferred range is 0.500≦︱RLGmin︱ / TG≦3.500.

[0218] 3. The optical imaging lens of the embodiment of the present invention satisfies the following combination, which is conducive to reducing the size of the lens and expanding the field of view at the same time: the first lens has a negative refractive power, the optical axis area of ​​the object side of the first lens is a convex surface, and HFOV / TTL≧15.000 degrees / mm, wherein the preferred range is 15.000 degrees / mm≦HFOV / TTL≦35.000 degrees / mm. When the third lens is designed to have a negative refractive power, the aberration of the optical system can be effectively corrected. When the second lens is designed to have a positive refractive power, or the fourth lens is designed to have a positive refractive power, distortion can be reduced. When the second lens is designed as a glass lens, the thermal stability of the optical imaging lens can be improved. In addition, when the size of the glass lens of the optical imaging lens is designed to satisfy 0.500≦︱RLGmin︱ / TG, the manufacturing yield of the microlens can be improved, and the optical imaging lens has good imaging quality, wherein the optimal range is 0.500≦︱RLGmin︱ / TG≦3.500.

[0219] 4. The optical imaging lens of the embodiment of the present invention satisfies the following combination, which is conducive to reducing the size of the lens and expanding the field of view at the same time: the optical axis area of ​​the object side of the first lens is designed to be convex, and HFOV / TTL≧15.000 degrees / mm, wherein the preferred range is 15.000 degrees / mm≦HFOV / TTL≦35.000 degrees / mm. When the circumferential area of ​​the object side of the third lens is designed to be concave, the edge aberration of the optical imaging lens can be corrected. When the second lens is designed to be a glass lens, the thermal stability of the optical imaging lens can be improved. When the size of the glass lens of the optical imaging lens is designed to meet 0.500≦︱RLGmin︱ / TG, the manufacturing yield of the micro lens can be improved, and the optical imaging lens has good imaging quality, wherein the preferred range is 0.500≦︱RLGmin︱ / TG≦3.500. Furthermore, when the first lens is designed to have a negative refractive power or the second lens is designed to have a positive refractive power, the aperture value of the optical imaging lens can be effectively reduced and the amount of light passing can be effectively increased. In addition, when the circumferential area of ​​the object side of the fourth lens is designed to be concave, the aberration of a large field angle can be corrected.

[0220] 5. The optical imaging lens of the embodiment of the present invention satisfies the following combination, which is conducive to reducing the size of the lens and expanding the field of view at the same time: the optical axis area of ​​the object side of the first lens is designed to be convex, and HFOV / TTL≧15.000 degrees / mm, wherein the preferred range is 15.000 degrees / mm≦HFOV / TTL≦35.000 degrees / mm. When the circumferential area of ​​the image side of the first lens is designed to be concave, the edge aberration of the optical imaging lens can be corrected. When the second lens is designed to be a glass lens, the thermal stability of the optical imaging lens can be improved. When the size of the glass lens of the optical imaging lens is designed to meet 0.500≦︱RLGmin︱ / TG, the manufacturing yield of the micro lens can be improved, and the optical imaging lens has good imaging quality, wherein the preferred range is 0.500≦︱RLGmin︱ / TG≦3.500. When the first lens is designed with a negative refractive power or the second lens is designed with a positive refractive power, the aperture value of the optical imaging lens can be effectively reduced and the amount of light passing can be effectively increased. In addition, when the optical axis area of ​​the image side of the third lens is designed to be concave, the incident angle of the imaging light entering the fourth lens can be corrected to improve the imaging quality.

[0221] 6. The optical imaging lens of the embodiment of the present invention satisfies the following combination, which is conducive to improving the manufacturing yield of the micro lens and maintaining the good imaging quality of the optical imaging lens at the same time: one of the first lens to the fourth lens is made of glass, and the glass lens satisfies 0.500≦︱RLGmin︱ / TG, wherein the preferred range is 0.500≦︱RLGmin︱ / TG≦3.500. When the optical axis area of ​​the object side of the glass lens is designed as a plane, or the optical axis area of ​​the image side of the glass lens is designed as a plane, the manufacturing yield of the optical imaging lens is improved. In addition, when one of the optical axis areas of the object side and the image side of the glass lens is designed as a plane, and the optical axis area of ​​the other side surface is designed as a convex surface (for example, the optical axis area of ​​the object side of the glass lens is a plane and the optical axis area of ​​the image side is a convex surface, or the optical axis area of ​​the object side of the glass lens is a convex surface and the optical axis area of ​​the image side is a plane), the manufacturing yield of the optical imaging lens is effectively improved.

[0222] The contents disclosed in each embodiment of the present invention include but are not limited to optical parameters such as focal length, lens thickness, and Abbe number. For example, the present invention discloses an optical parameter A and an optical parameter B in each embodiment, wherein the ranges covered by these optical parameters, the comparison relationship between the optical parameters, and the conditional ranges covered by multiple embodiments are specifically explained as follows:

[0223] (1) The range covered by the optical parameter, 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.

[0224] (2) The comparative relationship between optical parameters, for example: A is greater than B or A is less than B.

[0225] (3) The conditional range covered by multiple embodiments, specifically, the combination relationship or proportional relationship obtained by possible calculation of multiple optical parameters of the same embodiment, these relationships are 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 the optical parameters 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.

[0226] The ranges covered by the above optical parameters, the comparison relationship between the optical parameters, and the maximum and minimum values ​​of the conditional expressions, as well as the numerical ranges within the maximum and minimum values, are all features that can be implemented by the present invention and are within the scope disclosed by the present invention. The above is only an example and should not be limited to this.

[0227] All embodiments of the present invention can be implemented, and some feature combinations can be extracted from the same embodiment. Compared with the prior art, the feature combination can also achieve unexpected effects of the present case. The feature combination includes but is not limited to the combination of features such as face shape, refractive index and conditional formula. The disclosure of the implementation mode of the present invention is a specific embodiment to illustrate the principle of the present invention, and the present invention should not be limited to the disclosed embodiment. In other words, the embodiment and its drawings are only for demonstration of the present invention and are not limited thereto.

[0228] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person having ordinary knowledge in the technical field may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims

1. An optical imaging lens, characterized in that: The invention comprises a first lens, a second lens, a third lens and a fourth lens in sequence from an object side to an image side along an optical axis, wherein the first lens to the fourth lens each comprise an object-side surface facing the object side and allowing imaging light to pass therethrough, and an image-side surface facing the image side and allowing imaging light to pass therethrough; The first lens has a negative refractive power, an optical axis region of the object side surface of the first lens is a convex surface, an optical axis region of the image side surface of the first lens is a concave surface, and a circumferential region of the image side surface of the first lens is a concave surface; The second lens is a glass lens; The second lens has a positive refractive power; The third lens has a negative refractive power; The fourth lens has a positive refractive power, an optical axis region of the image side surface of the fourth lens is a convex surface, and a circumferential region of the image side surface of the fourth lens is a convex surface; The optical imaging lens has only the above four lenses and satisfies the following conditional expressions: HFOV / TTL≧15.000 degrees / mm, 0.500≦︱RLGmin︱ / TG and (V1+V2+V3) / V4≦3.000, wherein HFOV is a half viewing angle of the optical imaging lens, TTL is a distance from the object side surface of the first lens to an imaging surface on the optical axis, RLGmin is a smaller radius of curvature of the object side surface and the image side surface of the glass lens of the optical imaging lens, TG is a thickness of the glass lens on the optical axis, V1 is an Abbe number of the first lens, V2 is an Abbe number of the second lens, V3 is an Abbe number of the third lens, and V4 is an Abbe number of the fourth lens.

2. An optical imaging lens, characterized in that: The invention comprises a first lens, a second lens, a third lens and a fourth lens in sequence from an object side to an image side along an optical axis, wherein the first lens to the fourth lens each comprise an object-side surface facing the object side and allowing imaging light to pass therethrough, and an image-side surface facing the image side and allowing imaging light to pass therethrough; The first lens has a negative refractive power, an optical axis region of the object side surface of the first lens is a convex surface, an optical axis region of the image side surface of the first lens is a concave surface, and a circumferential region of the image side surface of the first lens is a concave surface; The second lens is a glass lens; The second lens has a positive refractive power; A circumferential area of ​​the object-side surface of the third lens is a concave surface; An optical axis region of the image-side surface of the fourth lens is a convex surface, and a circumferential region of the image-side surface of the fourth lens is a convex surface; The optical imaging lens has only the above four lenses and satisfies the following conditional expressions: HFOV / TTL≧15.000 degrees / mm, 0.500≦︱RLGmin︱ / TG and (V1+V2+V3) / V4≦3.000, wherein HFOV is a half viewing angle of the optical imaging lens, TTL is a distance from the object side surface of the first lens to an imaging surface on the optical axis, RLGmin is a smaller radius of curvature of the object side surface and the image side surface of the glass lens of the optical imaging lens, TG is a thickness of the glass lens on the optical axis, V1 is an Abbe number of the first lens, V2 is an Abbe number of the second lens, V3 is an Abbe number of the third lens, and V4 is an Abbe number of the fourth lens.

3. An optical imaging lens, characterized in that: The invention comprises a first lens, a second lens, a third lens and a fourth lens in sequence from an object side to an image side along an optical axis, wherein the first lens to the fourth lens each comprise an object-side surface facing the object side and allowing imaging light to pass therethrough, and an image-side surface facing the image side and allowing imaging light to pass therethrough; The first lens has a negative refractive power, an optical axis region of the object side surface of the first lens is a convex surface, a circumferential region of the image side surface of the first lens is a concave surface, and an optical axis region of the image side surface of the first lens is a concave surface; The second lens is a glass lens; The second lens has a positive refractive power; An optical axis region of the image-side surface of the fourth lens is a convex surface, and a circumferential region of the image-side surface of the fourth lens is a convex surface; The optical imaging lens has only the above four lenses and satisfies the following conditional expressions: HFOV / TTL≧15.000 degrees / mm, 0.500≦︱RLGmin︱ / TG and (V1+V2+V3) / V4≦3.000, wherein HFOV is a half viewing angle of the optical imaging lens, TTL is a distance from the object side surface of the first lens to an imaging surface on the optical axis, RLGmin is a smaller radius of curvature of the object side surface and the image side surface of the glass lens of the optical imaging lens, TG is a thickness of the glass lens on the optical axis, V1 is an Abbe number of the first lens, V2 is an Abbe number of the second lens, V3 is an Abbe number of the third lens, and V4 is an Abbe number of the fourth lens.

4. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies the following conditional formula: ALT / (T2+G23)≧2.600, wherein ALT is the sum of the thicknesses of four lenses from the first lens to the fourth lens on the optical axis, T2 is the thickness of the second lens on the optical axis, and G23 is the air gap between the second lens and the third lens on the optical axis.

5. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies the following conditional formula: BFL / (T3+G34)≧2.000, wherein BFL is the distance from the image side surface of the fourth lens to the imaging surface on the optical axis, T3 is the thickness of the third lens on the optical axis, and G34 is the air gap between the third lens and the fourth lens on the optical axis.

6. The optical imaging lens according to any one of claims 1 to 3, wherein: The optical imaging lens further satisfies the following conditional formula: TL / (EFL+AAG)≧1.200, wherein TL is a distance from the object side surface of the first lens to the image side surface of the fourth lens on the optical axis, EFL is an effective focal length of the optical imaging lens, and AAG is a sum of three air gaps from the first lens to the fourth lens on the optical axis.

7. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies the following conditional formula: (G12+T4) / T3≧2.500, wherein G12 is the air gap between the first lens and the second lens on the optical axis, T3 is the thickness of the third lens on the optical axis, and T4 is the thickness of the fourth lens on the optical axis.

8. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies the following conditional formula: HFOV / (TL*Fno)≧15.000 degrees / mm, 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, and Fno is the aperture value of the optical imaging lens.

9. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies the following conditional formula: (EFL+T4) / (G12+G23)≧4.900, wherein EFL is the effective focal length of the optical imaging lens, 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, and G23 is the air gap between the second lens and the third lens on the optical axis.

10. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies the following condition: T4 / T1≧2.000, wherein T1 is the thickness of the first lens on the optical axis, and T4 is the thickness of the fourth lens on the optical axis.

11. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies the following conditional formula: (T2+T3+T4) / EFL≧1.000, 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, T4 is the thickness of the fourth lens on the optical axis, and EFL is the effective focal length of the optical imaging lens.

12. The optical imaging lens according to any one of claims 1 to 3, wherein: The optical imaging lens further satisfies the following conditional formula: BFL / AAG≧2.400, wherein BFL is the distance from the image side surface of the fourth lens to the imaging surface on the optical axis, and AAG is the sum of three air gaps from the first lens to the fourth lens on the optical axis.

13. The optical imaging lens according to any one of claims 1 to 3, wherein: The optical imaging lens further satisfies the following condition: T4 / G12≦4.500, wherein T4 is the thickness of the fourth lens on the optical axis, and G12 is the air gap between the first lens and the second lens on the optical axis.

14. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies the following conditional formula: TTL / (G12+T2+T4)≦2.800, wherein G12 is the air gap between the first lens and the second lens on the optical axis, T2 is the thickness of the second lens on the optical axis, and T4 is the thickness of the fourth lens on the optical axis.

15. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies the following conditional formula: ImgH / (G12+G23)≧2.400, wherein ImgH is the image height of the optical imaging lens, G12 is the air gap between the first lens and the second lens on the optical axis, and G23 is the air gap between the second lens and the third lens on the optical axis.

16. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies the following conditional formula: (T3+BFL) / T4≦2.300, wherein T3 is the thickness of the third lens on the optical axis, T4 is the thickness of the fourth lens on the optical axis, and BFL is the distance from the image side surface of the fourth lens to the imaging plane on the optical axis.

17. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies the following conditional formula: (T2+T4) / T3≧3.500, 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, and T4 is the thickness of the fourth lens on the optical axis.

18. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies the following conditional formula: G12 / (G23+G34)≧1.500, wherein 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 G34 is the air gap between the third lens and the fourth lens on the optical axis.

19. The optical imaging lens according to any one of claims 1 to 3, characterized in that: The optical imaging lens further satisfies the following condition: T2 / G12≦3.100, wherein T2 is the thickness of the second lens on the optical axis, and G12 is the air gap between the first lens and the second lens on the optical axis.

Images