Optical imaging lens

Abstract

The invention provides an optical imaging lens. The optical imaging lens sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side on an optical axis. The first lens has a positive refractive index, the optical axis area of the image side surface of the first lens is a convex surface, the second lens has a positive refractive index, the circumferential area of the object side surface of the third lens is a convex surface, and the circumferential area of the object side surface of the fourth lens is a concave surface. The optical imaging lens only comprises the four lenses and meets the following conditional expression: (EFL + TTL) / D22t32 is greater than or equal to 33.000.

Description

Technical Field

[0001] The present invention relates to an optical imaging lens. Specifically, the present invention is particularly directed to an optical imaging lens that is mainly used for shooting images and recording videos and can be applied to portable electronic products, such as mobile phones, cameras, tablet computers, personal digital assistants (PDAs), and other electronic devices. Background Art

[0002] The specifications of portable electronic products are changing with each passing day, and their key components - optical imaging lenses are also becoming more diversified. Their applications are not limited to shooting images and videos, but also include the need for telephoto photography.

[0003] When the focal length of an optical imaging lens is increased, the system length also increases, which increases the distance between lenses and reduces assembly and manufacturing yield. Therefore, how to increase the system focal length of an optical imaging lens while maintaining imaging quality and improving assembly and manufacturing yield is a topic that needs to be explored in depth. Summary of the invention

[0004] Therefore, each embodiment of the present invention provides a four-piece optical imaging lens with a long focal length, excellent telephoto capability, good optical performance and technical feasibility. The four-piece optical imaging lens of the present invention has a first lens, a second lens, a third lens and a fourth lens arranged in sequence on the optical axis from the object side to the image side. The first lens, the second lens, the third lens and the fourth lens in the four-piece optical imaging lens of the present invention each 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.

[0005] In one embodiment of the present invention, the first lens has a positive refractive power, the optical axis region of the image side surface of the first lens is a convex surface, the second lens has a positive refractive power, the circumferential region of the object side surface of the third lens is a convex surface, and the circumferential region of the object side surface of the fourth lens is a concave surface. The optical imaging lens has only the above four lenses and satisfies the following conditional formula: (EFL+TTL) / D22t32≧33.000.

[0006] In another embodiment of the present invention, the first lens has a positive refractive power, the optical axis region of the image side surface of the first lens is a convex surface, the second lens has a positive refractive power, the circumferential region of the object side surface of the third lens is a convex surface, and the circumferential region of the object side surface of the fourth lens is a concave surface. The optical imaging lens has only the above four lenses and satisfies the following conditional formula: (EFL+BFL) / (T1+T2)≧7.900.

[0007] In another embodiment of the present invention, the first lens has a positive refractive power, the optical axis region of the image side surface of the first lens is a convex surface, the second lens has a positive refractive power, the circumferential region of the object side surface of the third lens is a convex surface, and the circumferential region of the object side surface of the fourth lens is a concave surface. The optical imaging lens has only the above four lenses and satisfies the following conditional formula: (EFL+T1) / (ALT+G23+G34)≧2.500.

[0008] In the optical imaging lens of the present invention, the embodiment may further selectively satisfy the following conditions: Fno*ALT / G12≧95.000;

[0009] (TL+G34) / (G23+T4)≧7.500;

[0010] (ALT+D32t42) / G12≧40.000;

[0011] (TTL+T4) / HFOV≧1.270;

[0012] ImgH / D22t32≧3.000;

[0013] ImgH*T2 / G12≧16.000;

[0014] (BFL+T2+T3) / (D11t21)≧10.000;

[0015] (EFL+T4) / D11t21≧11.300;

[0016] |υ1-υ2|*υ3≦350.000;

[0017] υ3+υ4≦55.000;

[0018] (υ1*υ2) / υ4≧120.000;

[0019] υ2*υ3 / υ4≧50.000;

[0020] (EFL+D12t22)*ImgH≧45.000;

[0021] HFOV / Fno*(G12+T3)≦2.700;

[0022] υ1 / (υ2-2*υ3)≧8.500;

[0023] υ3*υ4 / υ1<12.000;

[0024] Fno / (G12+T4)≧4.500.

[0025] Wherein, T1 is defined as the thickness of the first lens on the optical axis; T2 is defined as the thickness of the second lens on the optical axis; T3 is defined as the thickness of the third lens on the optical axis; T4 is defined as the thickness of the fourth lens on the optical axis; G12 is defined as the air gap between the first lens and the second lens on the optical axis; G23 is defined as the air gap between the second lens and the third lens on the optical axis; G34 is defined as the air gap between the third lens and the fourth lens on the optical axis; AAG is defined as the sum of the three air gaps from the first lens to the fourth lens on the optical axis, that is, the sum of G12, G23, and G34; ALT is defined as the sum of the four lens thicknesses from the first lens to the fourth lens on the optical axis, that is, the sum of T1, T2, T3, and T4; D11t21 is defined as the distance from the object side of the first lens to the object side of the second lens on the optical axis, that is, the sum of T1 and G12; D12t22 It is defined as the distance from the image side surface of the first lens to the image side surface of the second lens on the optical axis, that is, the sum of G12 and T2; D22t32 is defined as the distance from the image side surface of the second lens to the image side surface of the third lens on the optical axis, that is, the sum of G23 and T3; D32t42 is defined as the distance from the image side surface of the third lens to the image side surface of the fourth lens on the optical axis, that is, the sum of G34 and T4; TL is defined as the distance from the object side surface of the first lens to the image side surface of the fourth lens on the optical axis; TTL is defined as the distance from the object side surface of the first lens to the imaging plane on the optical axis, that is, the system length of the optical imaging lens; BFL is defined as the distance from the image side surface of the fourth lens to the imaging plane on the optical axis; EFL is defined as the effective focal length of the optical imaging lens; HFOV is defined as the half viewing angle of the optical imaging lens; ImgH is defined as the image height of the optical imaging lens; Fno is defined as the aperture value of the optical imaging lens.

[0026] In addition, υ1 is defined as the Vd Abbe number of the first lens; υ2 is defined as the Vd Abbe number of the second lens; υ3 is defined as the Vd Abbe number of the third lens; υ4 is defined as the Vd Abbe number of the fourth lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram showing the method for determining the curvature shape of the optical imaging lens of the present invention Figure 1 ;

[0028] Figure 2 Schematic diagram showing the method for determining the curvature shape of the optical imaging lens of the present invention Figure 2 ;

[0029] Figure 3 Schematic diagram showing the method for determining the curvature shape of the optical imaging lens of the present invention Figure 3 ;

[0030] Figure 4 Schematic diagram showing the method for determining the curvature shape of the optical imaging lens of the present invention Figure 4 ;

[0031] Figure 5 Schematic diagram showing the method for determining the curvature shape of the optical imaging lens of the present invention Figure 5 ;

[0032] Fig. 6A A schematic diagram illustrating an actual optical path of a first embodiment of the optical imaging lens of the present invention;

[0033] Figure 6B A schematic diagram illustrating a simulated light path of a first embodiment of the optical imaging lens of the present invention;

[0034] Fig. 7A The longitudinal spherical aberration of the first embodiment on the imaging plane is shown;

[0035] Figure 7B The field curvature aberration of the first embodiment in the sagittal direction is shown;

[0036] Figure 7C The field curvature aberration of the first embodiment in the tangential direction is shown;

[0037] Fig.7D The distortion aberration of the first embodiment is shown;

[0038] Figure 8 A schematic diagram illustrating a second embodiment of the optical imaging lens of the present invention;

[0039] Fig. 9A The longitudinal spherical aberration of the second embodiment on the imaging plane is shown;

[0040] Fig. 9B The field curvature aberration in the sagittal direction of the second embodiment is shown;

[0041] Fig. 9C The field curvature aberration of the second embodiment in the tangential direction is shown;

[0042] Fig.9D The distortion aberration of the second embodiment is shown;

[0043] Fig.10 A schematic diagram illustrating a third embodiment of the optical imaging lens of the present invention;

[0044] Fig.11A The longitudinal spherical aberration of the third embodiment on the imaging plane is shown;

[0045] Fig. 11B The field curvature aberration in the sagittal direction of the third embodiment is shown;

[0046] Fig. 11C The field curvature aberration of the third embodiment in the tangential direction is shown;

[0047] Fig.11D The distortion aberration of the third embodiment is shown;

[0048] Fig.12 A schematic diagram illustrating a fourth embodiment of the optical imaging lens of the present invention;

[0049] Fig.13A The longitudinal spherical aberration of the fourth embodiment on the imaging plane is shown;

[0050] Fig. 13B The field curvature aberration in the sagittal direction of the fourth embodiment is shown;

[0051] Fig. 13C The field curvature aberration of the fourth embodiment in the tangential direction is shown;

[0052] Fig.13D The distortion aberration of the fourth embodiment is shown;

[0053] Fig.14 A schematic diagram illustrating a fifth embodiment of the optical imaging lens of the present invention;

[0054] Fig.15A The longitudinal spherical aberration of the fifth embodiment on the imaging plane is shown;

[0055] Fig. 15B The field curvature aberration in the sagittal direction of the fifth embodiment is shown;

[0056] Fig. 15C The field curvature aberration of the fifth embodiment in the tangential direction is shown;

[0057] Fig.15D The distortion aberration of the fifth embodiment is shown;

[0058] Fig.16 A schematic diagram illustrating a sixth embodiment of the optical imaging lens of the present invention;

[0059] Fig.17A The longitudinal spherical aberration of the sixth embodiment on the imaging plane is shown;

[0060] Fig. 17B The field curvature aberration in the sagittal direction of the sixth embodiment is shown;

[0061] Fig. 17C The field curvature aberration of the sixth embodiment in the tangential direction is shown;

[0062] Fig.17D The distortion aberration of the sixth embodiment is shown;

[0063] Fig.18 A schematic diagram illustrating a seventh embodiment of the optical imaging lens of the present invention;

[0064] Fig.19A The longitudinal spherical aberration of the seventh embodiment on the imaging plane is shown;

[0065] Fig.19B The field curvature aberration in the sagittal direction of the seventh embodiment is shown;

[0066] Fig.19C The field curvature aberration of the seventh embodiment in the tangential direction is shown;

[0067] Fig.19D The distortion aberration of the seventh embodiment is shown;

[0068] Fig. 20 A schematic diagram illustrating an eighth embodiment of the optical imaging lens of the present invention;

[0069] Fig.21A The longitudinal spherical aberration of the eighth embodiment on the imaging plane is shown;

[0070] Fig. 21B The field curvature aberration in the sagittal direction of the eighth embodiment is shown;

[0071] Fig. 21C The field curvature aberration of the eighth embodiment in the tangential direction is shown;

[0072] Fig.21D The distortion aberration of the eighth embodiment is shown;

[0073] Fig. 22 A schematic diagram illustrating a ninth embodiment of the optical imaging lens of the present invention;

[0074] Fig.23A The longitudinal spherical aberration of the ninth embodiment on the imaging plane is shown;

[0075] Fig. 23B The field curvature aberration of the ninth embodiment in the sagittal direction is shown;

[0076] Fig.23C The field curvature aberration of the ninth embodiment in the tangential direction is shown;

[0077] Fig.23D The distortion aberration of the ninth embodiment is shown;

[0078] Fig.24 A schematic diagram illustrating a tenth embodiment of the optical imaging lens of the present invention;

[0079] Fig.25A The longitudinal spherical aberration of the tenth embodiment on the imaging plane is shown;

[0080] Fig.25B The field curvature aberration in the sagittal direction of the tenth embodiment is shown;

[0081] Fig.25C The field curvature aberration of the tenth embodiment in the tangential direction is shown;

[0082] Fig.25D The distortion aberration of the tenth embodiment is shown;

[0083] Fig.26 A schematic diagram illustrating an eleventh embodiment of the optical imaging lens of the present invention;

[0084] Fig.27A The longitudinal spherical aberration of the eleventh embodiment on the imaging plane is illustrated;

[0085] Fig.27B The field curvature aberration in the sagittal direction of the eleventh embodiment is shown;

[0086] Fig.27C The figure shows the field curvature aberration in the tangential direction of the eleventh embodiment;

[0087] Fig.27D The distortion aberration of the eleventh embodiment is shown;

[0088] Fig.28 A schematic diagram illustrating a twelfth embodiment of the optical imaging lens of the present invention is shown;

[0089] Fig.29A The longitudinal spherical aberration of the twelfth embodiment on the imaging plane is shown;

[0090] Fig.29B The field curvature aberration in the sagittal direction of the twelfth embodiment is shown;

[0091] Fig.29C The field curvature aberration of the twelfth embodiment in the tangential direction is shown;

[0092] Fig.29D The distortion aberration of the twelfth embodiment is shown;

[0093] Fig.30 Detailed optical data of the first embodiment are shown;

[0094] Fig.31 Detailed aspheric surface data of the first embodiment are shown;

[0095] Fig.32 Detailed optical data of the second embodiment are shown;

[0096] Fig.33 Detailed aspheric surface data of the second embodiment are shown;

[0097] Fig.34 shows detailed optical data of the third embodiment;

[0098] Fig.35 Detailed aspheric surface data of the third embodiment are shown;

[0099] Fig.36 Detailed optical data of the fourth embodiment are shown;

[0100] Fig.37 Detailed aspheric surface data of the fourth embodiment are shown;

[0101] Fig.38 Detailed optical data of the fifth embodiment are shown;

[0102] Fig.39 Detailed aspherical surface data of the fifth embodiment are shown;

[0103] Fig.40 shows detailed optical data of the sixth embodiment;

[0104] Fig.41 Detailed aspheric surface data of the sixth embodiment are shown;

[0105] Fig.42 Detailed optical data of the seventh embodiment are shown;

[0106] Fig.43 Detailed aspheric surface data of the seventh embodiment are shown;

[0107] Fig.44 shows detailed optical data of the eighth embodiment;

[0108] Fig.45 Detailed aspherical surface data of the eighth embodiment are shown;

[0109] Fig.46 Detailed optical data of the ninth embodiment are shown;

[0110] Fig.47 Detailed aspheric surface data of the ninth embodiment are shown;

[0111] Fig.48 Detailed optical data of the tenth embodiment are shown;

[0112] Fig.49 Detailed aspheric surface data of the tenth embodiment are shown;

[0113] Fig.50 Detailed optical data of the eleventh embodiment are shown;

[0114] Fig.51 Detailed aspheric surface data of the eleventh embodiment are shown;

[0115] Fig.52 shows detailed optical data of the twelfth embodiment;

[0116] Fig.53 Detailed aspheric surface data of the twelfth embodiment are shown;

[0117] Fig.54 Indicates the important parameters of each embodiment;

[0118] Fig.55 It shows the important parameter 2 of each embodiment.

[0119] Description of labels:

[0120] 1…optical imaging lens; 2…aperture; 3…filter; 4…imaging surface; 5…optical turning component;

[0121] 11, 21, 31, 41…side view of the object; 12, 22, 32, 42…side view of the image;

[0122] 13, 16, 23, 26, 33, 36, 43, 46, Z1…optical axis area;

[0123] 14, 17, 24, 27, 34, 37, 44, 47, Z2…circumferential area;

[0124] 10…first lens; 20…second lens; 30…third lens; 40…fourth lens;

[0125] 100, 200, 300, 400, 500… lenses;

[0126] 130…assembly unit; 211, 212…parallel light rays; A1…object side; A2…image side; CP…center point;

[0127] CP1…first center point; CP2…second center point; TP1…first transition point; TP2…second transition point;

[0128] OB…optical boundary; I…optical axis; I1…first optical axis; I2…second optical axis; Lc…chief ray;

[0129] Lm…edge ray; EL…extension line; Z3…relay area; M, R…intersection point. DETAILED DESCRIPTION

[0130] 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.

[0131] 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 1The object side (or image side) of the lens can be divided into different regions according to different positions, including an optical axis region, a circumferential region, or one or more intermediate regions in some embodiments. The description of these regions will be described in detail below.

[0132] 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 point of the surface and the optical axis I. Figure 1 As shown in the example, the first center point CP1 is located on the object side 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).

[0133] 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.

[0134] 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.

[0135] In addition, see Figure 1The lens 100 may further include an assembly portion 130 extending radially outward from the optical boundary OB. The assembly portion 130 is generally used for assembling the lens 100 to a corresponding component (not shown) of the optical system. The imaging light does not reach the assembly portion 130. The structure and shape of the assembly portion 130 are merely examples for illustrating the present invention and are not intended to limit the scope of the present invention. The assembly portion 130 of the lens discussed below may be partially or completely omitted in the drawings.

[0136] See also Figure 2 , define the area between the center point CP and the first transition point TP1 as the optical axis area Z1. Define the area between the first transition point TP1 and the optical boundary OB of the lens surface as the circumferential area Z2. Figure 2 As shown, after passing through the optical axis region Z1, the parallel light 211 intersects with the optical axis I at the image side A2 of the lens 200, that is, the focus of the parallel light 211 passing through the optical axis region Z1 is located at point R on the image side A2 of the lens 200. Since the light intersects with the optical axis I at the image side A2 of the lens 200, the optical axis region Z1 is a convex surface. On the contrary, the parallel light 212 diverges after passing through the circumferential region Z2. Figure 2 As shown, the extended line EL of the parallel light 212 after passing through the circumferential area Z2 intersects with the optical axis I at the object side A1 of the lens 200, that is, the focus of the parallel light 212 passing through the circumferential area Z2 is located at point M on the object side A1 of the lens 200. Since the extended line EL of the light intersects with the optical axis I at the object side A1 of the lens 200, the circumferential area Z2 is a concave surface. Figure 2 In the lens 200 shown, the first transition point TP1 is the boundary between the optical axis area and the circumferential area, that is, the first transition point TP1 is the boundary point where the convex surface turns into the concave surface.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] Figure 5is 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.

[0144] like Fig. 6A As shown, the optical imaging lens 1 of the present invention is mainly composed of four lenses along the optical axis I, from the object side A1 where the object (not shown) is placed to the image side A2 where the image is formed, including an aperture 2, a first lens 10, a second lens 20, a third lens 30, a fourth lens 40 and an image plane 4 in sequence. Generally speaking, the first lens 10, the second lens 20, the third lens 30 and the fourth lens 40 can all be made of transparent plastic materials, but the present invention is not limited thereto. Each lens has an appropriate refractive power. In the optical imaging lens 1 of the present invention, there are only four lenses with refractive power, namely the first lens 10, the second lens 20, the third lens 30 and the fourth lens 40. The optical axis I is the optical axis of the entire optical imaging lens 1, so the optical axis of each lens is the same as the optical axis of the optical imaging lens 1.

[0145] In addition, the optical imaging lens 1 also includes an aperture stop 2, which is disposed at an appropriate position. Fig. 6A In the embodiment, the aperture 2 is disposed on the side of the first lens 10 facing the object side A1, that is, disposed between the object side A1 and the first lens 10. When light (not shown) emitted by the object to be photographed (not shown) located on the object side A1 enters the optical imaging lens 1 of the present invention, it will sequentially pass through the aperture 2, the first lens 10, the second lens 20, the third lens 30, the fourth lens 40 and the filter 3, and will be focused on the imaging surface 4 on the image side A2 to form a clear image.

[0146] In order to meet the requirements of thinness, an optical bending component 5 is provided between the fourth lens 40 and the filter 3 or the imaging surface 4. The optical axis I is bent by the optical bending component 5 into a first optical axis I1 and a second optical axis I2 which does not coincide with the first optical axis. The optical bending component can be a prism, a reflector or other appropriate reflective components. It is additionally noted that the actual optical path is as follows: Fig. 6A shown, rather than Figure 6B However, in optical simulation, Figure 6B The light path shown is relatively simple to simulate / calculate, and Figure 6B The results of simulation / calculation based on the optical path shown are Fig. 6A The optical path shown is consistent with the simulated / calculated results.

[0147] In each embodiment of the present invention, the filter 3 is disposed between the optical deflection component 5 and the imaging surface 4, and can be a filter having various suitable functions, such as an infrared cut-off filter, which is used to prevent infrared rays in the imaging light from being transmitted to the imaging surface 4 and affecting the imaging quality.

[0148] Each lens in the optical imaging lens 1 of the present invention has an object-side surface facing the object side A1 and allowing imaging light to pass through, and an image-side surface facing the image side A2 and allowing imaging light to pass through. In addition, each lens in the optical imaging lens 1 of the present invention also has an optical axis region and a circumferential region. For example, the first lens 10 has an object-side surface 11 and an image-side surface 12; the second lens 20 has an object-side surface 21 and an image-side surface 22; the third lens 30 has an object-side surface 31 and an image-side surface 32; and the fourth lens 40 has an object-side surface 41 and an image-side surface 42. Each object-side surface and image-side surface has an optical axis region and a circumferential region, respectively.

[0149] Each lens in the optical imaging lens 1 of the present invention also has a thickness T on the optical axis I. For example, the first lens 10 has a first lens thickness T1, the second lens 20 has a second lens thickness T2, the third lens 30 has a third lens thickness T3, and the fourth lens 40 has a fourth lens thickness T4. Therefore, the sum of the thicknesses of the lenses in the optical imaging lens 1 of the present invention on the optical axis I is called ALT. That is, ALT=T1+T2+T3+T4.

[0150] In addition, in the optical imaging lens 1 of the present invention, there is an air gap between each lens on the optical axis I. For example, the air gap distance between the first lens 10 and the second lens 20 is called G12, the air gap distance between the second lens 20 and the third lens 30 is called G23, and the air gap distance between the third lens 30 and the fourth lens 40 is called G34. Therefore, the sum of the distances of the three air gaps between each lens on the optical axis I from the first lens 10 to the fourth lens 40 is called AAG. That is, AAG = G12 + G23 + G34.

[0151] D22t32 is the distance from the image side surface of the second lens to the image side surface of the third lens on the optical axis, that is, the sum of G23 and T3. D11t21 is the distance from the object side surface of the first lens to the object side surface of the second lens on the optical axis, that is, the sum of T1 and G12. D12t22 is the distance from the image side surface of the first lens to the image side surface of the second lens on the optical axis, that is, the sum of G12 and T2. D32t42 is the distance from the image side surface of the third lens to the image side surface of the fourth lens on the optical axis, that is, the sum of G34 and T4.

[0152] In addition, the distance between the object side surface 11 of the first lens 10 and the imaging surface 4 on the optical axis I is the system length TTL of the optical imaging lens 1. The effective focal length of the optical imaging lens 1 is EFL, and the distance between the object side surface 11 of the first lens 10 and the image side surface 42 of the fourth lens 40 on the optical axis I is TL. HFOV is the half field of view of the optical imaging lens 1, that is, half of the maximum field of view, ImgH (image height) is the image height of the optical imaging lens 1, and Fno is the aperture value of the optical imaging lens 1.

[0153] When the filter 3 is arranged between the optical inflection element 5 and the imaging plane 4, G4P represents the air gap between the image side surface 42 of the fourth lens 40 and the optical inflection element 5 on the optical axis I, TP represents the distance from the object side surface of the optical inflection element 5 to the imaging plane 4 on the optical axis I, TF represents the thickness of the filter 3 on the optical axis I, GFP represents the air gap between the filter 3 and the imaging plane 4 on the optical axis I, and BFL is the back focal length of the optical imaging lens 1, that is, the distance from the image side surface 42 of the fourth lens 40 to the imaging plane 4 on the optical axis I, that is, BFL=G4P+TP.

[0154] In addition, it is further defined that: f1 is the focal length of the first lens 10; f2 is the focal length of the second lens 20; f3 is the focal length of the third lens 30; f4 is the focal length of the fourth lens 40; n1 is the nd refractive index of the first lens 10; n2 is the nd refractive index of the second lens 20; n3 is the nd refractive index of the third lens 30; n4 is the nd refractive index of the fourth lens 40; υ1 is the Vd Abbe number of the first lens 10; υ2 is the Vd Abbe number of the second lens 20; υ3 is the Vd Abbe number of the third lens 30; υ4 is the Vd Abbe number of the fourth lens 40. The material parameters of the lens disclosed in the optical data table of the embodiment are in the format of nd refractive index and Vd Abbe number of the International Glass Code, so that those skilled in the art can know the specific material implementation. Among them, nd is the refractive index of the material at the d helium yellow line 587.56 nanometers, and Vd is calculated based on the refractive index of the material at the d, F and C wavelengths of the Fraunhofer spectrum. The focal length values ​​disclosed in the optical data table of the embodiment are calculated based on the refractive index of the wavelength band implemented by the optical system. The primary wavelength implemented in the embodiment of the present invention is 555 nanometers, so the focal length values ​​of the present invention are calculated based on the refractive index of the material at 555 nanometers.

[0155] First embodiment

[0156] See also Fig. 6A , illustrating the first embodiment of the actual optical path of the optical imaging lens 1 of the present invention. Figure 6B , illustrating the first embodiment of the optical imaging lens 1 of the present invention to simulate the optical path. For the longitudinal spherical aberration (longitudinal spherical aberration) on the imaging surface 4 of the first embodiment, please refer to Fig. 7A For sagittal field curvature, please refer to Figure 7B For the field curvature aberration in the tangential direction, please refer to Figure 7C , and distortion aberration, please refer to Fig.7D The Y axis of each spherical aberration diagram in all embodiments represents the field of view, and the highest point thereof is 1.0. The Y axis of each aberration diagram and distortion diagram in the embodiments represents the image height, and the image height of the first embodiment is 3.528 mm.

[0157] The optical imaging lens 1 of the first embodiment mainly comprises an aperture 2, four lenses with refractive power, namely, a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, an optical turning component 5 and an imaging surface 4. The aperture 2 of the first embodiment is disposed on the side of the first lens 10 facing the object side A1, that is, disposed between the object side A1 and the first lens 10.

[0158] The first lens 10 has a positive refractive power. The optical axis region 13 of the object side surface 11 of the first lens 10 is a convex surface and the circumferential region 14 thereof is a convex surface, and the optical axis region 16 of the image side surface 12 of the first lens 10 is a convex surface and the circumferential region 17 thereof is a convex surface. In the present embodiment, the object side surface 11 and the image side surface 12 of the first lens 10 are both spherical surfaces, and the first lens is a spherical lens, but the present invention is not limited thereto.

[0159] The second lens 20 has a positive refractive power. The optical axis region 23 of the object side surface 21 of the second lens 20 is a convex surface and the circumferential region 24 thereof is a convex surface, and the optical axis region 26 of the image side surface 22 of the second lens 20 is a concave surface and the circumferential region 27 thereof is a concave surface. Both the object side surface 21 and the image side surface 22 of the second lens 20 are aspherical surfaces, but the present invention is not limited thereto.

[0160] The third lens 30 has a negative refractive power, the optical axis region 33 of the object side surface 31 of the third lens 30 is a convex surface and the circumferential region 34 thereof is a convex surface, the optical axis region 36 of the image side surface 32 of the third lens 30 is a concave surface and the circumferential region 37 thereof is a concave surface. The object side surface 31 and the image side surface 32 of the third lens 30 are both aspherical surfaces, but the present invention is not limited thereto.

[0161] The fourth lens 40 has a negative refractive power, the optical axis region 43 of the object side surface 41 of the fourth lens 40 is a concave surface and the circumferential region 44 thereof is a concave surface, the optical axis region 46 of the image side surface 42 of the fourth lens 40 is a convex surface and the circumferential region 47 thereof is a convex surface. The object side surface 41 and the image side surface 42 of the fourth lens 40 are both aspherical surfaces, but not limited thereto. The optical turning component 5 is disposed between the image side surface 42 of the fourth lens 40 and the filter 3. The filter 3, such as an infrared filter, is disposed between the optical turning component 5 and the imaging surface 4.

[0162] In the optical imaging lens 1 of the present invention, if all the object-side surfaces 21 / 31 / 41 and the image-side surfaces 22 / 32 / 42 of the second lens 20 to the fourth lens 40 are aspherical surfaces, then these aspherical surfaces are defined by the following formula:

[0163]

[0164] in:

[0165] Y represents the vertical distance between the point on the aspherical surface and the optical axis I;

[0166] Z represents the depth of the aspherical surface (the vertical distance between the point on the aspherical surface that is Y away from the optical axis I and the tangent plane that is tangent to the vertex on the aspherical surface on the optical axis I);

[0167] R represents the radius of curvature of the lens surface;

[0168] K is the conic constant;

[0169] a i is the i-th order aspheric coefficient, wherein the a2 coefficient of each embodiment is 0.

[0170] First Embodiment The optical data of the optical imaging lens system are as follows: Fig.30 This embodiment is as shown. Fig.31 The aspherical surface data of the object side surface 21 / 31 / 41 and the image side surface 22 / 32 / 42 of the second lens 20 to the fourth lens 40 are the same as the following embodiments. In the optical imaging lens system of the following embodiments, the aperture value (f-number) of the overall optical imaging lens is Fno, the effective focal length is (EFL), and the half field of view (Half Field of View, referred to as HFOV) is half of the maximum field of view (Field of View) in the overall optical imaging lens. The image height, radius of curvature, thickness and focal length of the optical imaging lens are all in millimeters (mm). In this embodiment, EFL = 16.882 mm; HFOV = 11.678 degrees; TTL = 20.549 mm; Fno = 2.800; ImgH = 3.528 mm.

[0171] Second embodiment

[0172] See also Figure 8 , illustrating the second embodiment of the optical imaging lens 1 of the present invention. Please note that starting from the second embodiment, in order to simplify and clearly express the diagram, only the optical axis area and the circumference area of ​​each lens that are different from the first embodiment are specially marked on the figure, while the optical axis area and the circumference area of ​​the other lens surfaces that are the same as the first embodiment, such as concave or convex surfaces, are not marked separately. For the longitudinal spherical aberration of the second embodiment on the imaging surface 4, please refer to Fig. 9A For field curvature aberration in the sagittal direction, please refer to Fig. 9B For the field curvature aberration in the meridian direction, please refer to Fig. 9C 、For distortion, please refer to Fig.9D The design of the second embodiment is similar to that of the first embodiment, except that the lens refractive power, lens curvature radius, lens thickness, lens aspheric coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the fourth lens 40 has a positive refractive power, and the circumferential area 47 of the image side surface 42 of the fourth lens 40 is a concave surface.

[0173] The detailed optical data of the second embodiment are as follows Fig.32 As shown, the aspheric data is as follows Fig.33As shown. In this embodiment, EFL = 16.791 mm; HFOV = 11.726 degrees; TTL = 20.076 mm; Fno = 2.800; ImgH = 3.528 mm. In particular: 1. The system length TTL of this embodiment is shorter than the system length TTL of the first embodiment; 2. The half viewing angle of this embodiment is greater than the half viewing angle of the first embodiment.

[0174] Third embodiment

[0175] See also Fig.10 , illustrating the third embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the third embodiment on the imaging plane 4, please refer to Fig.11A For field curvature aberration in the sagittal direction, please refer to Fig. 11B For the field curvature aberration in the meridian direction, please refer to Fig. 11C 、For distortion, please refer to Fig.11D The design of the third embodiment is similar to that of the first embodiment, except that the lens refractive power, lens curvature radius, lens thickness, lens aspheric coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the fourth lens 40 has a positive refractive power, and the circumferential area 47 of the image side surface 42 of the fourth lens 40 is a concave surface.

[0176] The detailed optical data of the third embodiment are as follows Fig.34 As shown, the aspheric data is as follows Fig.35 As shown, in this embodiment, EFL = 16.785 mm; HFOV = 11.726 degrees; TTL = 20.613 mm; Fno = 2.800; ImgH = 3.528 mm. In particular, the half viewing angle of this embodiment is greater than that of the first embodiment.

[0177] Fourth embodiment

[0178] See also Fig.12 , illustrating the fourth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the fourth embodiment on the imaging plane 4, please refer to Fig.13A For field curvature aberration in the sagittal direction, please refer to Fig. 13B For the field curvature aberration in the meridian direction, please refer to Fig. 13C 、For distortion, please refer to Fig.13D The design of the fourth embodiment is similar to that of the first embodiment, except that the lens refractive power, lens curvature radius, lens thickness, lens asphericity coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the fourth lens 40 has a positive refractive power.

[0179] The detailed optical data of the fourth embodiment are as follows Fig.36 As shown, the aspheric data is as follows Fig.37As shown. In this embodiment, EFL = 17.606 mm; HFOV = 7.740 degrees; TTL = 21.096 mm; Fno = 2.800; ImgH = 2.405 mm. In particular: 1. The longitudinal spherical aberration of this embodiment is smaller than that of the first embodiment; 2. The field curvature aberration in the sagittal direction of this embodiment is smaller than that of the first embodiment; 3. The field curvature aberration in the meridional direction of this embodiment is smaller than that of the first embodiment; 4. The distortion aberration of this embodiment is smaller than that of the first embodiment.

[0180] Fifth embodiment

[0181] See also Fig.14 , illustrating the fifth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the fifth embodiment on the imaging plane 4, please refer to Fig.15A For field curvature aberration in the sagittal direction, please refer to Fig. 15B For the field curvature aberration in the meridian direction, please refer to Fig. 15C 、For distortion, please refer to Fig.15D The design of the fifth embodiment is similar to that of the first embodiment, except that the lens refractive power, lens curvature radius, lens thickness, lens asphericity coefficient or back focal length and other related parameters are different.

[0182] The detailed optical data of the fifth embodiment are as follows Fig.38 As shown, the aspheric data is as follows Fig.39 In this embodiment, EFL=16.899 mm, HFOV=11.726 degrees, TTL=21.036 mm, Fno=2.800, and ImgH=3.525 mm. In particular, the half viewing angle of this embodiment is greater than that of the first embodiment.

[0183] Sixth embodiment

[0184] See also Fig.16 , illustrating the sixth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the sixth embodiment on the imaging plane 4, please refer to Fig.17A For field curvature aberration in the sagittal direction, please refer to Fig. 17B For the field curvature aberration in the meridian direction, please refer to Fig. 17C 、For distortion, please refer to Fig.17D The design of the sixth embodiment is similar to that of the first embodiment, except that the lens refractive power, lens curvature radius, lens thickness, lens asphericity coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the fourth lens 40 has a positive refractive power.

[0185] The detailed optical data of the sixth embodiment are as follows Fig.40 As shown, the aspheric data is as follows Fig.41As shown, in this embodiment, EFL = 16.858 mm; HFOV = 11.708 degrees; TTL = 20.787 mm; Fno = 2.800; ImgH = 3.528 mm. In particular: 1. The half viewing angle of this embodiment is greater than that of the first embodiment; 2. The distortion aberration of this embodiment is less than that of the first embodiment.

[0186] Seventh embodiment

[0187] See also Fig.18 , illustrating the seventh embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the seventh embodiment on the imaging plane 4, please refer to Fig.19A For field curvature aberration in the sagittal direction, please refer to Fig.19B For the field curvature aberration in the meridian direction, please refer to Fig.19C 、For distortion, please refer to Fig.19D The design of the seventh embodiment is similar to that of the first embodiment, except that the lens refractive power, lens curvature radius, lens thickness, lens aspheric coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the optical axis region 13 of the object side surface 11 of the first lens 10 is a concave surface and the circumferential region 14 thereof is a concave surface, and the optical axis region 26 of the image side surface 22 of the second lens 20 is a convex surface and the circumferential region 27 thereof is a convex surface.

[0188] The detailed optical data of the seventh embodiment are as follows Fig.42 As shown, the aspheric data is as follows Fig.43 As shown, in this embodiment, EFL = 16.961 mm; HFOV = 11.727 degrees; TTL = 23.419 mm; Fno = 2.800; ImgH = 3.528 mm. In particular: 1. The half viewing angle of this embodiment is greater than that of the first embodiment; 2. The distortion aberration of this embodiment is less than that of the first embodiment.

[0189] Eighth embodiment

[0190] See also Fig. 20 , illustrating the eighth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the eighth embodiment on the imaging plane 4, please refer to Fig.21A For field curvature aberration in the sagittal direction, please refer to Fig. 21B For the field curvature aberration in the meridian direction, please refer to Fig. 21C 、For distortion, please refer to Fig.21D The design of the eighth embodiment is similar to that of the first embodiment, except that the lens refractive power, lens curvature radius, lens thickness, lens aspheric coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the circumferential area 47 of the image side surface 42 of the fourth lens 40 is concave.

[0191] The detailed optical data of the eighth embodiment are as follows Fig.44As shown, the aspheric data is as follows Fig.45 As shown, in this embodiment, EFL = 16.719 mm; HFOV = 8.781 degrees; TTL = 20.108 mm; Fno = 2.800; ImgH = 2.600 mm. In particular: 1. The system length TTL of this embodiment is shorter than the system length TTL of the first embodiment; 2. The distortion aberration of this embodiment is smaller than the distortion aberration of the first embodiment.

[0192] Ninth embodiment

[0193] See also Fig. 22 , illustrating the ninth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the ninth embodiment on the imaging plane 4, please refer to Fig.23A For field curvature aberration in the sagittal direction, please refer to Fig. 23B For the field curvature aberration in the meridian direction, please refer to Fig.23C 、For distortion, please refer to Fig.23D The design of the ninth embodiment is similar to that of the first embodiment, except that the lens refractive power, lens curvature radius, lens thickness, lens aspheric coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the circumferential area 47 of the image side surface 42 of the fourth lens 40 is concave.

[0194] The detailed optical data of the ninth embodiment are as follows Fig.46 As shown, the aspheric data is as follows Fig.47 As shown, in this embodiment, EFL = 16.894 mm; HFOV = 11.729 degrees; TTL = 20.497 mm; Fno = 2.800; ImgH = 3.528 mm. In particular: 1. The system length TTL of this embodiment is shorter than the system length TTL of the first embodiment; 2. The half angle of view of this embodiment is greater than the half angle of view of the first embodiment; 3. The distortion aberration of this embodiment is less than the distortion aberration of the first embodiment.

[0195] Tenth embodiment

[0196] See also Fig.24 , illustrating the tenth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the tenth embodiment on the imaging plane 4, please refer to Fig.25A For field curvature aberration in the sagittal direction, please refer to Fig.25B For the field curvature aberration in the meridian direction, please refer to Fig.25C 、For distortion, please refer to Fig.25D The design of the tenth embodiment is similar to that of the first embodiment, except that the lens refractive power, lens curvature radius, lens thickness, lens asphericity coefficient or back focal length and other related parameters are different. In addition, in this embodiment, the fourth lens 40 has a positive refractive power.

[0197] The detailed optical data of the tenth embodiment are as follows Fig.48As shown, the aspheric data is as follows Fig.49 As shown, in this embodiment, EFL = 16.934 mm; HFOV = 11.722 degrees; TTL = 21.439 mm; Fno = 2.800; ImgH = 3.528 mm. In particular: 1. The half viewing angle of this embodiment is greater than that of the first embodiment; 2. The distortion aberration of this embodiment is less than that of the first embodiment.

[0198] Eleventh Embodiment

[0199] See also Fig.26 , illustrating the eleventh embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the eleventh embodiment on the imaging plane 4, please refer to Fig.27A For field curvature aberration in the sagittal direction, please refer to Fig.27B For the field curvature aberration in the meridian direction, please refer to Fig.27C 、For distortion, please refer to Fig.27D . The design of the eleventh embodiment is similar to that of the first embodiment, except that the relevant parameters such as the lens refractive power, the lens curvature radius, the lens thickness, the lens aspheric coefficient or the back focal length are different. In addition, in the present embodiment, the optical axis region 13 of the object side surface 11 of the first lens 10 is a concave surface and the circumferential region 14 thereof is a concave surface, the optical axis region 26 of the image side surface 22 of the second lens 20 is a convex surface and the circumferential region 27 thereof is a convex surface, the third lens 30 has a positive refractive power, the optical axis region 43 of the object side surface 41 of the fourth lens 40 is a convex surface, the optical axis region 46 of the image side surface 42 of the fourth lens 40 is a concave surface and the circumferential region 47 thereof is a concave surface.

[0200] Detailed optical data of the eleventh embodiment are as follows Fig.50 As shown, the aspheric data is as follows Fig.51 As shown, in this embodiment, EFL = 14.565 mm; HFOV = 15.999 degrees; TTL = 19.749 mm; Fno = 2.800; ImgH = 4.188 mm. In particular: 1. The system length TTL of this embodiment is shorter than the system length TTL of the first embodiment; 2. The half angle of view of this embodiment is greater than the half angle of view of the first embodiment; 3. The distortion aberration of this embodiment is less than the distortion aberration of the first embodiment.

[0201] Twelfth Embodiment

[0202] See also Fig.28 , illustrating the twelfth embodiment of the optical imaging lens 1 of the present invention. For the longitudinal spherical aberration of the twelfth embodiment on the imaging plane 4, please refer to Fig.29A For field curvature aberration in the sagittal direction, please refer to Fig.29B For the field curvature aberration in the meridian direction, please refer to Fig.29C 、For distortion, please refer to Fig.29DThe design of the twelfth embodiment is similar to that of the first embodiment, except that the lens refractive power, lens curvature radius, lens thickness, lens asphericity coefficient or back focal length and other related parameters are different.

[0203] The detailed optical data of the twelfth embodiment are as follows Fig.52 As shown, the aspheric data is as follows Fig.53 As shown, in this embodiment, EFL = 16.827 mm; HFOV = 11.730 degrees; TTL = 20.404 mm; Fno = 2.800; ImgH = 3.528 mm. In particular: the half viewing angle of this embodiment is greater than the half viewing angle of the first embodiment.

[0204] In addition, the important parameters of each embodiment are summarized in Fig.54 ,and Fig.55 middle.

[0205] The embodiments of the present invention have the following effects:

[0206] 1. When the second lens element 20 of the present invention has a positive refractive power, it can converge light rays of different angles. The optical axis region 16 of the image side surface 12 of the first lens element 10 is a convex surface, which can correct the aberration of the central field of view of the imaging surface. In addition, the surface shape of the specific lens circumferential region, for example, the circumferential region 34 of the object side surface 31 of the third lens element 30 is a convex surface, and the circumferential region 44 of the object side surface 41 of the fourth lens element 40 is a concave surface, can further correct the distortion of the peripheral field of view. Through the combination of focal length and lens length, when (EFL+TTL) / D22t32≧33.000 is met, in addition to effectively enhancing the telephoto capability of the lens, the imaging quality can also be maintained. The preferred range of (EFL+TTL) / D22t32 is 163.500≧(EFL+TTL) / D22t32≧33.000.

[0207] 2. Based on point 1 (i.e., on the basis of point 1), when the first lens 10 further satisfies the requirement of having a positive refractive power, the assembly yield can be improved.

[0208] 3. When the second lens element 20 of the present invention has a positive refractive power, it can converge light rays of different angles. When the optical axis region 16 of the image-side surface 12 of the first lens element 10 is a convex surface, the aberration of the central field of view of the imaging surface can be corrected. In addition, when the surface shape of the specific lens circumferential region, for example, the circumferential region 34 of the object-side surface 31 of the third lens element 30 is a convex surface and the circumferential region 44 of the object-side surface 41 of the fourth lens element 40 is a concave surface, the distortion of the peripheral field of view can be further corrected. When the focal length and the lens thickness are matched and (EFL+BFL) / (T1+T2)≧7.900 is met, in addition to effectively enhancing the telephoto capability of the lens, the imaging quality can also be maintained. The preferred range of (EFL+BFL) / (T1+T2) is 20.500≧(EFL+BFL) / (T1+T2)≧7.900.

[0209] 4. Based on point 3 (i.e., on the basis of point 3), when the first lens 10 further satisfies the requirement of having a positive refractive power, the assembly yield can be improved.

[0210] 5. When the second lens element 20 of the present invention has a positive refractive power, it can converge light rays of different angles. When the optical axis region 16 of the image side surface 12 of the first lens element 10 is a convex surface, the aberration of the central field of view of the imaging surface can be corrected. In addition, when the surface shape of the specific lens circumferential region, for example, the circumferential region 34 of the object side surface 31 of the third lens element 30 is a convex surface and the circumferential region 44 of the object side surface 41 of the fourth lens element 40 is a concave surface, the distortion of the peripheral field of view can be further corrected. When the focal length and the lens thickness are matched to meet (EFL+T1) / (ALT+G23+G34)≧2.500, in addition to effectively enhancing the telephoto capability of the lens, the imaging quality can also be maintained. The preferred range of (EFL+T1) / (ALT+G23+G34) is 5.750≧(EFL+T1) / (ALT+G23+G34)≧2.500.

[0211] 6. Based on point 5 (i.e., on the basis of point 5), when the first lens 10 has a positive refractive power, the assembly yield can be improved.

[0212] 7. When the lens material meets the following configuration relationship, it is beneficial to the transmission and deflection of imaging light, while effectively improving chromatic aberration, so that the optical imaging lens has excellent optical quality.

[0213] |υ1-υ2|*υ3≦350.000, the optimal range is 114.000≦|υ1-υ2|*υ3≦350.000.

[0214] υ3+υ4≦55.000, the optimal range is 40.000≦υ3+υ4≦55.000.

[0215] (υ1*υ2) / υ4≧120.000, the optimal range is 180.000≧(υ1*υ2) / υ4≧120.000.

[0216] υ2*υ3 / υ4≧50.000, the optimal range is 82.500≧υ2*υ3 / υ4≧50.000.

[0217] υ1 / (υ2-2*υ3)≧8.500, the optimal range is 13.500≧υ1 / (υ2-2*υ3)≧8.500.

[0218] υ3*υ4 / υ1≦12.000, the optimal range is 8.000≦υ3*υ4 / υ1≦12.000.

[0219] 8. In order to increase the focal length of the system and ensure the image quality, while taking into account the difficulty of manufacturing, to avoid any parameter being too large and thus detrimental to improving the aberration of the optical lens system, or to avoid any parameter being too small and thus affecting assembly, if the numerical limits of the following conditional formula are met, the embodiments of the present invention can have a better configuration.

[0220] (EFL+TTL) / D22t32≧33.000, the preferred range is 163.500≧(EFL+TTL) / D22t32≧33.000.

[0221] (EFL+BFL) / (T1+T2)≧7.900, the optimal range is 20.500≧(EFL+BFL) / (T1+T2)≧7.900. (EFL+T1) / (ALT+G23+G34)≧2.500, the optimal range is 5.750≧(EFL+T1) / (ALT+G23+G34)≧2.500.

[0222] (TTL+G34) / (G23+T4)≧32.500, the preferred range is 65.500≧(TTL+G34) / (G23+T4)≧32.500. (TTL+T4) / HFOV≧1.260 mm / degree, the preferred range is 3.100≧(TTL+T4) / HFOV≧1.260 mm / degree.

[0223] (EFL+T4) / D11t21≧11.300, the preferred range is 24.000≧(EFL+T4) / D11t21≧11.300.

[0224] HFOV / Fno*(G12+T3)≦2.700 degrees·mm, and the optimal range is 1.000≦HFOV / Fno*(G12+T3)≦2.700 degrees·mm.

[0225] (BFL+G34) / AAG≧8.000, the optimal range is 58.000≧(BFL+G34) / AAG≧8.000.

[0226] (TTL+T2+G34) / (AAG+T1)≧6.500, the preferred range is 21.000≧(TTL+T2+G34) / (AAG+T1)≧6.500.

[0227] (TL+T1+G23) / (AAG+T2+G34)≦2.000, and the preferred range is 1.100≦(TL+T1+G23) / (AAG+T2+G34)≦2.000.

[0228] HFOV*T1 / (ALT+T3)≦6.300 degrees, and the preferred range is 2.300≦HFOV*T1 / (ALT+T3)≦6.300 degrees.

[0229] (BFL+G34) / (TL+G23)≧2.400, the preferred range is 5.500≧(BFL+G34) / (TL+G23)≧2.400. (BFL+T2+T3) / D11t21≧10.000, the preferred range is 25.000≧(BFL+T2+T3) / D11t21≧10.000. Fno / (G12+T4)≧4.500, the preferred range is 17.000≧Fno / (G12+T4)≧4.500.

[0230] Fno*T2 / AAG≧1.300, the preferred range is 18.300≧Fno*T2 / AAG≧1.300.

[0231] ImgH*T2 / G12≧16.000, the preferred range is 178.000≧ImgH*T2 / G12≧16.000.

[0232] Fno*ALT / G12≧95.000, the optimal range is 263.800≧Fno*ALT / G12≧95.000.

[0233] (EFL+D12t22)*ImgH≧45.000, the preferred range is 76.700≧(EFL+D12t22)*ImgH≧45.000. ImgH / D22t32≧3.000, the preferred range is 15.500≧ImgH / D22t32≧3.000.

[0234] (TL+G34) / (G23+T4)≧7.500, the optimal range is 22.800≧(TL+G34) / (G23+T4)≧7.500. (ALT+T3) / T4≧6.800, the optimal range is 29.000≧(ALT+T3) / T4≧6.800.

[0235] (ALT+D32t42) / G12≧40.000, the preferred range is 141.000≧(ALT+D32t42) / G12≧40.000.

[0236] In addition, any combination of parameters of the embodiment may be selected to increase lens restrictions, so as to facilitate the lens design of the same structure of the present invention.

[0237] In view of the unpredictability of optical system design, under the framework of the present invention, meeting the above conditions can better shorten the length of the system of the present invention, have a small aperture value, increase the image height, improve the image quality, or improve the assembly yield to improve the shortcomings of the previous technology. The lens of the embodiment of the present invention uses plastic material to reduce the weight of the lens and save costs.

[0238] The numerical ranges obtained by the combination ratio relationship of the optical parameters disclosed in each embodiment of the present invention, including the maximum and minimum values, can be implemented accordingly.

[0239] The contents disclosed in each embodiment of the present invention include but are not limited to optical parameters such as focal length, lens thickness, Vd Abbe number, etc. 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:

[0240] (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.

[0241] (2) The comparative relationship between optical parameters, for example: A is greater than B or A is less than B.

[0242] (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.

[0243] 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.

[0244] 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.

[0245] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. An optical imaging lens, characterized in that: The invention comprises a first lens, a second lens, a third lens and a fourth lens in sequence along an optical axis from an object side to an image side, and each of the first lens to the fourth lens comprises 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 positive refractive power; An optical axis region of the image-side surface of the first lens is a convex surface; The second lens has a positive refractive power; A circumferential area of ​​the object-side surface of the third lens is a convex surface; A circumferential area of ​​the object-side surface of the fourth lens is a concave surface; Among them, the optical imaging lens consists of only the above four lenses, EFL is defined as the effective focal length of the optical imaging lens, TTL is defined as the distance from the object side surface of the first lens to an imaging surface on the optical axis, D22t32 is defined as the distance from the image side surface of the second lens to the image side surface of the third lens on the optical axis, and satisfies the following conditional formula: (EFL+TTL) / D22t32≧33.

000.

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 along an optical axis from an object side to an image side, and each of the first lens to the fourth lens comprises 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 positive refractive power; An optical axis region of the image-side surface of the first lens is a convex surface; The second lens has a positive refractive power; A circumferential area of ​​the object-side surface of the third lens is a convex surface; A circumferential area of ​​the object-side surface of the fourth lens is a concave surface; The optical imaging lens comprises only the above four lenses, EFL is defined as the effective focal length of the optical imaging lens, BFL is defined as the distance from the image side surface of the fourth lens to an imaging surface on the optical axis, T1 is defined as the thickness of the first lens on the optical axis, T2 is defined as the thickness of the second lens on the optical axis, and the following condition is satisfied: (EFL+BFL) / (T1+T2)≧7.

900.

3. The optical imaging lens according to claim 1 or 2, wherein: Fno is defined as the aperture value of the optical imaging lens, ALT is defined as the sum of the thicknesses of the four lenses from the first lens to the fourth lens on the optical axis, G12 is defined as the air gap between the first lens and the second lens on the optical axis, and the optical imaging lens satisfies the following condition: Fno*ALT / G12≧95.

000.

4. The optical imaging lens according to claim 1 or 2, wherein: TL is defined as the distance from the object side surface of the first lens to the image side surface of the fourth lens on the optical axis, G34 is defined as the air gap between the third lens and the fourth lens on the optical axis, G23 is defined as the air gap between the second lens and the third lens on the optical axis, T4 is defined as the thickness of the fourth lens on the optical axis, and the optical imaging lens satisfies the following condition: (TL+G34) / (G23+T4)≧7.

500.

5. The optical imaging lens according to claim 1 or 2, wherein: ALT is defined as the sum of the thicknesses of four lenses from the first lens to the fourth lens on the optical axis, D32t42 is defined as the distance from the image side surface of the third lens to the image side surface of the fourth lens on the optical axis, G12 is defined as the air gap between the first lens and the second lens on the optical axis, and the optical imaging lens satisfies the following condition: (ALT+D32t42) / G12≧40.

000.

6. 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 along an optical axis from an object side to an image side, and each of the first lens to the fourth lens comprises 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 positive refractive power; An optical axis region of the image-side surface of the first lens is a convex surface; The second lens has a positive refractive power; A circumferential area of ​​the object-side surface of the third lens is a convex surface; A circumferential area of ​​the object-side surface of the fourth lens is a concave surface; The optical imaging lens has only the above four lenses, EFL is defined as the effective focal length of the optical imaging lens, T1 is defined as the thickness of the first lens on the optical axis, ALT is defined as the sum of the thicknesses of the four lenses from the first lens to the fourth lens on the optical axis, G23 is defined as the air gap between the second lens and the third lens on the optical axis, G34 is defined as the air gap between the third lens and the fourth lens on the optical axis, and the following condition is satisfied: (EFL+T1) / (ALT+G23+G34)≧2.

500.

7. The optical imaging lens according to claim 2 or 6, wherein: TTL is defined as the distance from the object side of the first lens to an imaging plane on the optical axis, T4 is defined as the thickness of the fourth lens on the optical axis, HFOV is defined as the half viewing angle of the optical imaging lens, and the optical imaging lens satisfies the following condition: (TTL+T4) / HFOV≧1.

260.

8. The optical imaging lens according to claim 2 or 6, wherein: ImgH is defined as the image height of the optical imaging lens, D22t32 is defined as the distance from the image side surface of the second lens to the image side surface of the third lens on the optical axis, and the optical imaging lens satisfies the following condition: ImgH / D22t32≧3.

000.

9. The optical imaging lens according to claim 1 or 6, wherein: ImgH is defined as the image height of the optical imaging lens, T2 is defined as the thickness of the second lens on the optical axis, G12 is defined as the air gap between the first lens and the second lens on the optical axis, and the optical imaging lens satisfies the following condition: ImgH*T2 / G12≧16.

000.

10. The optical imaging lens according to claim 1 or 6, wherein: BFL is defined as the distance from the image side surface of the fourth lens to an imaging plane on the optical axis, T2 is defined as the thickness of the second lens on the optical axis, T3 is defined as the thickness of the third lens on the optical axis, D11t21 is defined as the distance from the object side surface of the first lens to the object side surface of the second lens on the optical axis, and the optical imaging lens satisfies the following condition: (BFL+T2+T3) / (D11t21)≧10.

000.

11. The optical imaging lens according to claim 1, 2 or 6, wherein: T4 is defined as the thickness of the fourth lens on the optical axis, D11t21 is defined as the distance from the object side surface of the first lens to the object side surface of the second lens on the optical axis, and the optical imaging lens satisfies the following condition: (EFL+T4) / D11t21≧11.

300.

12. The optical imaging lens according to claim 1, 2 or 6, wherein: υ1 is defined as the Vd Abbe number of the first lens, υ2 is defined as the Vd Abbe number of the second lens, υ3 is defined as the Vd Abbe number of the third lens, and the optical imaging lens satisfies the following condition: |υ1-υ2|*υ3≦350.

000.

13. The optical imaging lens according to claim 1, 2 or 6, wherein: υ3 is defined as the Vd Abbe number of the third lens, υ4 is defined as the Vd Abbe number of the fourth lens, and the optical imaging lens satisfies the following condition: υ3+υ4≦55.

000.

14. The optical imaging lens according to claim 1, 2 or 6, wherein: υ1 is defined as the Vd Abbe number of the first lens, υ2 is defined as the Vd Abbe number of the second lens, υ4 is defined as the Vd Abbe number of the fourth lens, and the optical imaging lens satisfies the following condition: (υ1*υ2) / υ4≧120.

000.

15. The optical imaging lens according to claim 1, 2 or 6, wherein: υ2 is defined as the Vd Abbe number of the second lens, υ3 is defined as the Vd Abbe number of the third lens, υ4 is defined as the Vd Abbe number of the fourth lens, and the optical imaging lens satisfies the following condition: υ2*υ3 / υ4≧50.

000.

16. The optical imaging lens according to claim 1, 2 or 6, wherein: D12t22 is defined as the distance from the image side surface of the first lens to the image side surface of the second lens on the optical axis, and ImgH is defined as the image height of the optical imaging lens, and the optical imaging lens satisfies the following condition: (EFL+D12t22)*ImgH≧45.

000.

17. The optical imaging lens according to claim 1, 2 or 6, wherein: HFOV is defined as a half viewing angle of the optical imaging lens, Fno is defined as an aperture value of the optical imaging lens, G12 is defined as an air gap between the first lens and the second lens on the optical axis, T3 is defined as a thickness of the third lens on the optical axis, and the optical imaging lens satisfies the following condition: HFOV / Fno*(G12+T3)≦2.

700.

18. The optical imaging lens according to claim 1, 2 or 6, wherein: υ1 is defined as the Vd Abbe number of the first lens, υ2 is defined as the Vd Abbe number of the second lens, υ3 is defined as the Vd Abbe number of the third lens, and the optical imaging lens satisfies the following condition: υ1 / (υ2-2*υ3)≧8.

500.

19. The optical imaging lens according to claim 1, 2 or 6, wherein: υ1 is defined as the Vd Abbe number of the first lens, υ3 is defined as the Vd Abbe number of the third lens, υ4 is defined as the Vd Abbe number of the fourth lens, and the optical imaging lens satisfies the following condition: υ3*υ4 / υ1<12.

000.

20. The optical imaging lens according to claim 1, 2 or 6, wherein: Fno is defined as the aperture value of the optical imaging lens, G12 is defined as the air gap between the first lens and the second lens on the optical axis, T4 is defined as the thickness of the fourth lens on the optical axis, and the optical imaging lens satisfies the following condition: Fno / (G12+T4)≧4.500.

Images