Optical imaging lens

Abstract

An optical imaging lens comprises a first lens group, an aperture and a second lens group in sequence from an object side to an image side along an optical axis. The first lens group is composed of a first lens and a second lens which are arranged along the optical axis from the object side to the image side. The first lens has negative refractive power, the object side surface of the first lens is a concave surface, the image side surface of the first lens is a convex surface, the second lens has positive refractive power, and the second lens group is composed of a third lens, a fourth lens and a fifth lens which are arranged along the optical axis from the object side to the image side; the third lens element has negative refractive power. The fourth lens element has positive refractive power. The fifth lens has negative refractive power, the object side surface of the fifth lens is a concave surface, the image side surface of the fifth lens is a convex surface, and good imaging quality is realized through the lens arrangement of the optical imaging lens.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging system, and particularly relates to an optical imaging lens with low distortion and good imaging quality. BACKGROUND

[0002] In recent years, with the popularity of portable electronic products with photographic functions, the demand for optical systems continues to grow. A typical optical system adopts a charge coupled device (CCD) or a complementary metal-oxide semiconductor sensor (CMOS sensor), and as the semiconductor process technology advances, the pixel size of the photosensitive element is reduced, and the optical system gradually develops towards the high-pixel field. At the same time, with the rapid development of unmanned aerial vehicles and autonomous vehicles, advanced driver assistance systems (ADAS) play an important role in vehicle safety. These systems use various lenses to configure sensors to collect environmental information in real time and provide more comprehensive information for drivers. In addition, as the temperature of the external application environment changes, the quality of the lens for temperature also increases, and therefore the requirement for imaging quality is increasing.

[0003] A good imaging lens usually has the advantages of low distortion and high resolution. However, in practical applications, factors such as small size and cost need to be considered. Therefore, it is a big problem for designers to design a lens with good imaging quality under various constraints. SUMMARY

[0004] Therefore, the purpose of the present application is to provide an optical imaging lens with the advantage of good imaging quality.

[0005] In order to achieve the above-mentioned purpose, the optical imaging lens provided by the present application comprises, in order from an object side to an image side along an optical axis, a first lens group, an aperture and a second lens group. The first lens group is composed of a first lens and a second lens arranged along the optical axis from the object side to the image side; the first lens has negative refractive power, the object side surface of the first lens is concave, and the image side surface of the first lens is convex; the second lens has positive refractive power; the second lens group is composed of a third lens, a fourth lens and a fifth lens arranged along the optical axis from the object side to the image side; the third lens has negative refractive power; the fourth lens has positive refractive power; the fifth lens has negative refractive power, the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is convex.

[0006] The optical imaging lens is arranged into an optical assembly in at least five pieces of lenses, and by accurately configuring the refractive power of the optical imaging lens and satisfying specific conditions, good imaging quality can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1A A structure diagram of the optical imaging lens of the first embodiment of the present application.

[0008] Figure 1B A longitudinal chromatic aberration diagram of the optical imaging lens of the first embodiment of the present application.

[0009] Figure 1C A transverse chromatic aberration diagram of the optical imaging lens of the first embodiment of the present application.

[0010] Figure 2A A structure diagram of the optical imaging lens of the second embodiment of the present application.

[0011] Figure 2B A longitudinal chromatic aberration diagram of the optical imaging lens of the second embodiment of the present application.

[0012] Figure 2C A transverse chromatic aberration diagram of the optical imaging lens of the second embodiment of the present application.

[0013] Figure 3A A structure diagram of the optical imaging lens of the third embodiment of the present application.

[0014] Figure 3B A longitudinal chromatic aberration diagram of the optical imaging lens of the third embodiment of the present application.

[0015] Figure 3C A transverse chromatic aberration diagram of the optical imaging lens of the third embodiment of the present application.

[0016] REFERENCE SIGNS:

[0017] 100, 200, 300: optical imaging lens

[0018] G1: first lens group

[0019] G2: second lens group

[0020] L1: first lens

[0021] L2: second lens

[0022] L3: third lens

[0023] L4: fourth lens

[0024] L5: fifth lens

[0025] L6: infrared filter

[0026] L7: protective glass

[0027] Im: imaging plane

[0028] S5: stop

[0029] Z: optical axis

[0030] S1, S3, S6, S7, S9, S11, S13: object side surface

[0031] S2, S4, S7, S8, S10, S12, S14: image side surface DETAILED DESCRIPTION

[0032] In order to more clearly illustrate the application, a preferred embodiment will be described in detail with reference to the attached drawings. Please refer to Figure 1A For the optical imaging lens 100 of the first embodiment of the present application, sequentially includes a first lens group G1, a stop S5 and a second lens group G2 from an object side to an image side along an optical axis Z. In the first embodiment, the optical imaging lens 100 has at least five lenses, wherein the first lens group G1 is composed of a first lens L1 and a second lens L2 arranged along the optical axis Z from the object side to the image side; the second lens group G2 is composed of a third lens L3, a fourth lens L4 and a fifth lens L5 arranged along the optical axis Z from the object side to the image side, wherein the first lens L1, the second lens L2 and the fifth lens L5 are all single lenses, indicating that there is an air gap between the first lens L1 and the second lens L2 on the optical axis Z and between the fourth lens L4 and the fifth lens L5 on the optical axis Z, and the third lens L3 and the fourth lens L4 are cemented to form a composite lens.

[0033] The first lens L1 has negative refractive power, the object side surface S1 of the first lens L1 is concave, and the image side surface S2 of the first lens L1 is convex. In this embodiment, both the object side surface S1 and the image side surface S2 of the first lens L1 are aspherical surfaces.

[0034] The second lens L2 is a biconvex lens with positive refractive power. In this embodiment, both the object side surface S3 and the image side surface S4 of the second lens L2 are spherical surfaces.

[0035] The third lens L3 has negative refractive power, the object side surface S6 of the third lens L3 is convex, and the image side surface S7 of the third lens L3 is concave. In this embodiment, both the object side surface S6 and the image side surface S7 of the third lens L3 are spherical surfaces.

[0036] The fourth lens L4 is a double convex lens with positive refractive power, wherein the object side S7 and the image side S8 of the fourth lens L4 are both spherical surfaces. In this embodiment, the image side S7 of the third lens L3 corresponds to the object side S7 of the fourth lens L4, so that the third lens L3 and the fourth lens L4 are combined into a composite lens with positive refractive power.

[0037] The fifth lens L5 has negative refractive power. The object side S9 of the fifth lens L5 is a concave surface, and the image side S10 of the fifth lens L5 is a convex surface. In this embodiment, the object side S9 and the image side S10 of the fifth lens L5 are both aspherical surfaces.

[0038] In addition, the optical imaging lens 100 further comprises an infrared filter L6 and a protective glass L7. The infrared filter L6 forms an object side S11 on the side facing the object side and an image side S12 on the side facing the image side. The infrared filter L6 is located on the side of the image side S10 of the fifth lens L5, and is used to limit the infrared spectrum received by the optical imaging lens 100, thereby improving the image quality and authenticity. The protective glass L7 forms an object side S13 on the side facing the object side and an image side S14 on the side facing the image side. The protective glass L7 is arranged on the side of the infrared filter L6 and located between the infrared filter L6 and an imaging plane Im, and is used to protect the infrared filter L6.

[0039] In order to ensure that the optical imaging lens 100 of the present application can maintain good optical performance and high-level imaging quality, in the first embodiment, the optical imaging lens 100 satisfies the following conditional expressions:

[0040] (1) -17.00 < F / fg1 < -12.00;

[0041] (2) -0.50 < F / fg2 < -0.30;

[0042] (3) -0.76 < F / f1 < -0.73;

[0043] (4) 0.78 < F / f2 < 0.8;

[0044] (5) -0.49 < F / f3 < -0.46;

[0045] (6) 1.30 < F / f4 < 1.35;

[0046] (7) -0.89 < F / f5 < -0.83;

[0047] (8) -0.80 < fg2 / (R1+R2+R3+R4+R6+R7+R8+R9+R10) < -0.30;

[0048] (9) -1.50 < fg2 / (R6+R7+R8+R9+R10) < -0.80;

[0049] (10) -0.80 < fg1 / (R1+R2+R3+R4+R6+R7+R8+R9+R10) < -0.60;

[0050] (11) -1.60 < fg1 / (R1+R2+R3+R4) < -1.50;

[0051] (12) -2.00 < F / R1 < -1.50;

[0052] (13) -0.80 < F / R2 < -0.60;

[0053] (14) 0.55 < F / R3 < 0.65;

[0054] (15) -0.70 < F / R4 < -0.55;

[0055] (16) 1.00 < F / R6 < 1.60;

[0056] (17) 1.90 < F / R7 < 2.00;

[0057] (18) -0.45 < F / R8 < -0.35;

[0058] (19) -3.00 < F / R9 < -2.95;

[0059] (20) -1.80 < F / R10 < -1.70.

[0060] Wherein, F is the focal length of the optical imaging lens 100, f1 is the focal length of the first lens L1, f2 is the focal length of the second lens L2, f3 is the focal length of the third lens L3, f4 is the focal length of the fourth lens L4, f5 is the focal length of the fifth lens L5, fg1 is the combined focal length of the first lens group G1, fg2 is the combined focal length of the second lens group G2, R1 is the radius of curvature of the object side S1 of the first lens L1, R2 is the radius of curvature of the image side S2 of the first lens L1, R3 is the radius of curvature of the object side S3 of the second lens L2, R4 is the radius of curvature of the image side S4 of the second lens L2, R6 is the radius of curvature of the object side S6 of the third lens L3, R7 is the common radius of curvature of the image side S7 of the third lens L3 and the object side S7 of the fourth lens L4, R8 is the radius of curvature of the image side S8 of the fourth lens L4, R9 is the radius of curvature of the object side S9 of the fifth lens L5, and R10 is the radius of curvature of the image side S10 of the fifth lens L5.

[0061] The following Table 1 is the optical data of the optical imaging lens 100 of the first embodiment of the present application, including the focal length F (or effective focal length) of the optical imaging lens 100, the aperture value Fno, the field of view FOV, the radius of curvature R of each lens, the distance between each surface and the next surface on the optical axis Z, the refractive index Nd of each lens, the dispersion, and the focal length of each lens. The units of the focal length, the radius of curvature, and the distance are mm.

[0062] Table 1, Optical data table of the optical imaging lens of the first embodiment

[0063]

[0064]

[0065] From the above Table 1, it can be seen that the focal length F of the optical imaging lens 100 of the first embodiment is 15.245 mm, the aperture value Fno is 15.245, the field of view FOV is 34.7 degrees, the focal length f1 of the first lens L1 is -20.281 mm, the focal length f2 of the second lens L2 is 19.109 mm, the focal length f3 of the third lens L3 is -31.537 mm, the focal length f4 of the fourth lens L4 is 11.347 mm, the focal length f5 of the fifth lens L5 is -17.491 mm, the cemented focal length f34 of the third lens L3 and the fourth lens L4 forming a composite lens is 18.559 mm, the combined focal length fg1 of the first lens group G1 is 49.757 mm, and the combined focal length fg2 of the second lens group G2 is 37.472 mm.

[0066] Further, based on the above-mentioned detailed parameters, the specific numerical values of the aforementioned conditional expressions in the first embodiment are as follows:

[0067] (1) F / fg1 = 0.306;

[0068] (2) F / fg2 = 0.407;

[0069] (3) F / f1 = -0.752;

[0070] (4) F / f2 = 0.798;

[0071] (5) F / f3 = -0.483;

[0072] (6) F / f4 = 1.344;

[0073] (7) F / f5 = -0.872;

[0074] (8) fg2 / (R1+R2+R3+R4+R6+R7+R8+R9+R10) = -0.575;

[0075] (9) fg2 / (R6+R7+R8+R9+R10) = -1.113;

[0076] (10) fg1 / (R1+R2+R3+R4+R6+R7+R8+R9+R10) = -0.764;

[0077] (11) fg1 / (R1+R2+R3+R4) = -1.581;

[0078] (12) F / R1 = -1.708;

[0079] (13) F / R2 = -0.676;

[0080] (14) F / R3 = 0.625;

[0081] (15) F / R4 = -0.625;

[0082] (16) F / R6 = 1.313;

[0083] (17) F / R7 = 1.974;

[0084] (18) F / R8 = -0.406;

[0085] (19) F / R9 = -2.921;

[0086] (20) F / R10 = -1.489.

[0087] From the data in Table 1, the focal length of the first lens L1 to the focal length of the fifth lens L5, the combined focal length fg1 of the first lens group G1, the combined focal length fg2 of the second lens group G2, and the radius of curvature of the first lens L1 to the radius of curvature of the fifth lens L5 in the first embodiment all satisfy the ratio condition formula of the aforementioned (1) to (20) points set for the optical imaging lens 100.

[0088] It is worth mentioning that the aspherical surface profile shape Z of the object side S1 and the image side S2 of the first lens L1 and the object side S9 and the image side S10 of the fifth lens L5 in the first embodiment are obtained by the following formula:

[0089]

[0090] wherein,

[0091] Z: aspherical surface profile shape;

[0092] c: reciprocal of the radius of curvature;

[0093] h: off-axis half height of the surface;

[0094] k: conic constant;

[0095] A2, A4, A6, A8, A10, A12, A14, and A16: respective order coefficients of the off-axis half height h of the surface.

[0096] In the optical imaging lens 100 of the first embodiment of the present application, the conic constant k and the respective order coefficients A2, A4, A6, A8, A10, A12, A14, and A16 of each aspherical surface are shown in Table 2 as follows:

[0097] Table 2: Conic coefficient table of each aspherical surface of the first embodiment

[0098] Surface Number S1 S2 S9 S10 k -4.24E-01 -6.66E-01 -1.84E+00 -4.73E+00 A2 0 0 0 0 A4 1.99E-04 2.07E-04 -3.62E-05 7.04E-04 A6 5.11E-06 2.66E-06 5.41E-05 5.75E-06 A8 -3.41E-07 -1.05E-07 -6.73E-06 2.19E-06 A10 1.68E-08 3.81E-09 3.42E-07 -3.86E-07 A12 -3.82E-10 -4.80E-11 -3.61E-09 2.37E-08 A14 3.09E-12 0 -1.58E-10 -5.09E-10 A16 0 0 0 0

[0099] Subsequently, the imaging quality of the optical imaging lens 100 is verified by optical simulation data. Figure 1B For the longitudinal chromatic aberration diagram of the first embodiment of the present application, Figure 1C For the transverse chromatic aberration diagram of the first embodiment of the present application. From Figure 1B and Figure 1C The results of the optical imaging lens 100 of the present embodiment can verify that the design described above can effectively improve the imaging quality.

[0100] Please refer to Figure 2AFor the optical imaging lens 200 of the second embodiment of the present application, sequentially includes a first lens group G1, a stop S5 and a second lens group G2 from an object side to an image side along an optical axis Z. In the second embodiment, the optical imaging lens 200 has at least five lenses, wherein the first lens group G1 is composed of a first lens L1 and a second lens L2 arranged along the optical axis Z from the object side to the image side; the second lens group G2 is composed of a third lens L3, a fourth lens L4 and a fifth lens L5 arranged along the optical axis Z from the object side to the image side, wherein the first lens L1, the second lens L2 and the fifth lens L5 are all single lenses, indicating that the first lens L1 and the second lens L2 are respectively provided with an air gap on the optical axis Z, and the fourth lens L4 and the fifth lens L5 are respectively provided with an air gap on the optical axis Z, and the third lens L3 and the fourth lens L4 are cemented to form a composite lens.

[0101] The first lens L1 has negative refractive power, the object side surface S1 of the first lens L1 is concave, and the image side surface S2 of the first lens L1 is convex. In this embodiment, the object side surface S1 and the image side surface S2 of the first lens L1 are both aspherical surfaces.

[0102] The second lens L2 is a biconvex lens with positive refractive power. In this embodiment, the object side surface S3 and the image side surface S4 of the second lens L2 are both spherical surfaces.

[0103] The third lens L3 has negative refractive power, the object side surface S6 of the third lens L3 is convex, and the image side surface S7 of the third lens L3 is concave. In this embodiment, the object side surface S6 and the image side surface S7 of the third lens L3 are both spherical surfaces.

[0104] The fourth lens L4 is a biconvex lens with positive refractive power, wherein the object side surface S7 and the image side surface S8 of the fourth lens L4 are both spherical surfaces. In this embodiment, the image side surface S7 of the third lens L3 corresponds to the object side surface S7 of the fourth lens L4, so that the third lens L3 and the fourth lens L4 are combined into a composite lens with positive refractive power.

[0105] The fifth lens L5 has negative refractive power, the object side surface S9 of the fifth lens L5 is concave, and the image side surface S10 of the fifth lens L5 is convex. In this embodiment, the object side surface S9 and the image side surface S10 of the fifth lens L5 are both aspherical surfaces.

[0106] In addition, the optical imaging lens 200 further comprises an infrared filter L6 and a protective glass L7. The infrared filter L6 is formed with a subject side S11 on the side facing the subject and an image side S12 on the side facing the image. The infrared filter L6 is located on the side of the image side S10 of the fifth lens L5, and is used to limit the infrared spectrum received by the optical imaging lens 200, thereby improving the image quality and authenticity. The protective glass L7 is formed with a subject side S13 on the side facing the subject and an image side S14 on the side facing the image. The protective glass L7 is arranged on the side of the infrared filter L6 and is located between the infrared filter L6 and an imaging plane Im, and is used to protect the infrared filter L6.

[0107] In order to ensure that the optical imaging lens 200 of the present application can maintain good optical performance and high-level imaging quality, in the second embodiment, the optical imaging lens 200 satisfies the following conditional expressions:

[0108] (1) -17.00<F / fg1<-12.00;

[0109] (2) -0.50<F / fg2<-0.30;

[0110] (3) -0.76<F / f1<-0.73;

[0111] (4) 0.78<F / f2<0.8;

[0112] (5) -0.49<F / f3<-0.46;

[0113] (6) 1.30<F / f4<1.35;

[0114] (7) -0.89<F / f5<-0.83;

[0115] (8) -0.80<fg2 / (R1+R2+R3+R4+R6+R7+R8+R9+R10)<-0.30;

[0116] (9) -1.50<fg2 / (R6+R7+R8+R9+R10)<-0.80;

[0117] (10) -0.80<fg1 / (R1+R2+R3+R4+R6+R7+R8+R9+R10)<-0.60;

[0118] (11) -1.60<fg1 / (R1+R2+R3+R4)<-1.50;

[0119] (12) -2.00 < F / R1 < -1.50;

[0120] (13) -0.80 < F / R2 < -0.60;

[0121] (14) 0.55 < F / R3 < 0.65;

[0122] (15) -0.70 < F / R4 < -0.55;

[0123] (16) 1.00 < F / R6 < 1.60;

[0124] (17) 1.90 < F / R7 < 2.00;

[0125] (18) -0.45 < F / R8 < -0.35;

[0126] (19) -3.00 < F / R9 < -2.95;

[0127] (20) -1.80 < F / R10 < -1.70.

[0128] wherein F is the focal length of the optical imaging lens 200, f1 is the focal length of the first lens L1, f2 is the focal length of the second lens L2, f3 is the focal length of the third lens L3; f4 is the focal length of the fourth lens L4; f5 is the focal length of the fifth lens L5; fg1 is the combined focal length of the first lens group G1; fg2 is the combined focal length of the second lens group G2; R1 is the radius of curvature of the object side S1 of the first lens L1, R2 is the radius of curvature of the image side S2 of the first lens L1, R3 is the radius of curvature of the object side S3 of the second lens L2, R4 is the radius of curvature of the image side S4 of the second lens L2, R6 is the radius of curvature of the object side S6 of the third lens L3, R7 is the common radius of curvature of the image side S7 of the third lens L3 and the object side S7 of the fourth lens L4, R8 is the radius of curvature of the image side S8 of the fourth lens L4, R9 is the radius of curvature of the object side S9 of the fifth lens L5, R10 is the radius of curvature of the image side S10 of the fifth lens L5.

[0129] Table 3 below is the optical data of the optical imaging lens 200 of the second embodiment of the present application, including: the focal length F (or effective focal length) of the optical imaging lens 200, the aperture value Fno, the field of view FOV, the radius of curvature R of each lens, the distance between each surface and the next surface on the optical axis Z, the refractive index Nd of each lens, the dispersion, the focal length of each lens; wherein the units of focal length, radius of curvature and distance are mm.

[0130] Table 3, the optical data table of the optical imaging lens of the second embodiment

[0131]

[0132]

[0133] From the above Table 3, the optical imaging lens 200 of the second embodiment has a focal length F = 15.195 mm, an aperture value Fno = 1.761, and a field of view FOV = 35.039 degrees. The first lens L1 has a focal length f1 = -20.239 mm, the second lens L2 has a focal length f2 = 19.305 mm, the third lens L3 has a focal length f3 = -31.736 mm, the fourth lens L4 has a focal length f4 = 11.353 mm, the fifth lens L5 has a focal length f5 = -17.090 mm, the third lens L3 and the fourth lens L4 have a cemented focal length f34 = 18.500 mm of the cemented composite lens, the first lens group G1 has a combined focal length fg1 = 49.635 mm, and the second lens group G2 has a combined focal length fg2 = 37.923 mm.

[0134] In addition, based on the above detailed parameters, the specific numerical values of the aforementioned conditional expressions in the first embodiment are as follows:

[0135] (1) F / fg1 = 0.306;

[0136] (2) F / fg2 = 0.401;

[0137] (3) F / f1 = -0.751;

[0138] (4) F / f2 = 0.787;

[0139] (5) F / f3 = -0.479;

[0140] (6) F / f4 = 1.338;

[0141] (7) F / f5 = -0.889;

[0142] (8) fg2 / (R1+R2+R3+R4+R6+R7+R8+R9+R10) = -0.584;

[0143] (9) fg2 / (R6+R7+R8+R9+R10) = -1.128;

[0144] (10) fg1 / (R1+R2+R3+R4+R6+R7+R8+R9+R10) = -0.764;

[0145] (11) fg1 / (R1+R2+R3+R4) = -1.584;

[0146] (12) F / R1 = -1.705;

[0147] (13) F / R2 = -0.674;

[0148] (14) F / R3 = 0.620;

[0149] (15) F / R4 = -0.623;

[0150] (16) F / R6 = 1.312;

[0151] (17) F / R7 = 1.966;

[0152] (18) F / R8 = -0.405;

[0153] (19) F / R9 = -2.946;

[0154] (20) F / R10 = -1.487.

[0155] From the data in Table 3, the focal length of the first lens L1 to the focal length of the fifth lens L5, the combined focal length fg1 of the first lens group G1, the combined focal length fg2 of the second lens group G2, and the radius of curvature of the first lens L1 to the radius of curvature of the fifth lens L5 in the second embodiment all satisfy the ratio condition formula of the aforementioned (1) to (20) points set for the optical imaging lens 200.

[0156] It is worth mentioning that the aspherical surface profile shape Z of the object side S1 and the image side S2 of the first lens L1 and the object side S9 and the image side S10 of the fifth lens L5 in the second embodiment are obtained by the following formula:

[0157]

[0158] wherein,

[0159] Z: aspherical surface profile shape;

[0160] c: reciprocal of the radius of curvature;

[0161] h: off-axis half height of the surface;

[0162] k: conic constant;

[0163] A2, A4, A6, A8, A10, A12, A14, and A16: each-order coefficient of the off-axis half height h of the surface.

[0164] The conic constants k and the A2, A4, A6, A8, A10, A12, A14 and A16 order coefficients of each aspherical surface in the optical imaging lens 200 of the second embodiment of the present application are shown in Table 4 below:

[0165] Table 4: Conic constants of each aspherical surface in the second embodiment

[0166] Surface Number S1 S2 S9 S10 k -4.24E-01 -6.66E-01 -1.84E+00 -4.73E+00 A2 0 0 0 0 A4 1.99E-04 2.07E-04 -3.62E-05 7.04E-04 A6 5.11E-06 2.66E-06 5.41E-05 5.75E-06 A8 -3.41E-07 -1.05E-07 -6.73E-06 2.19E-06 A10 1.68E-08 3.81E-09 3.42E-07 -3.86E-07 A12 -3.82E-10 -4.80E-11 -3.61E-09 2.37E-08 A14 3.09E-12 0.00E+00 -1.58E-10 -5.09E-10 A16 0 0 0 0

[0167] Subsequently, the imaging quality of the optical imaging lens 200 is verified by optical simulation data. Figure 2B Figure 6 is a longitudinal chromatic aberration diagram of the optical imaging lens 300 of the third embodiment of the present application. Figure 2C Figure 7 is a transverse chromatic aberration diagram of the optical imaging lens 300 of the third embodiment of the present application. Figure 2B and Figure 2C The results show that the optical imaging lens 300 of the third embodiment of the present application can effectively improve the imaging quality.

[0168] Reference is made to Figure 3A The optical imaging lens 300 of the third embodiment of the present application sequentially includes a first lens group G1, a stop S5 and a second lens group G2 along an optical axis Z from an object side to an image side. In the third embodiment, the optical imaging lens 300 has at least five lenses, wherein the first lens group G1 is composed of a first lens L1 and a second lens L2 arranged along the optical axis Z from the object side to the image side; the second lens group G2 is composed of a third lens L3, a fourth lens L4 and a fifth lens L5 arranged along the optical axis Z from the object side to the image side, wherein the first lens L1, the second lens L2 and the fifth lens L5 are single lenses, indicating that the first lens L1 and the second lens L2 and the fourth lens L4 and the fifth lens L5 have an air gap on the optical axis Z, respectively, and the third lens L3 and the fourth lens L4 are cemented to form a composite lens.

[0169] The first lens L1 has negative refractive power, the object side surface S1 of the first lens L1 is concave, and the image side surface S2 of the first lens L1 is convex. In the present embodiment, the object side surface S1 and the image side surface S2 of the first lens L1 are aspherical surfaces.

[0170] The second lens L2 is a biconvex lens with positive refractive power. In the present embodiment, the object side surface S3 and the image side surface S4 of the second lens L2 are spherical surfaces.

[0171] The third lens L3 has negative refractive power, the object side S6 of the third lens L3 is a convex surface, and the image side S7 of the third lens L3 is a concave surface. In this embodiment, the object side S6 and the image side S7 of the third lens L3 are both spherical surfaces.

[0172] The fourth lens L4 is a biconvex lens having positive refractive power, wherein the object side S7 and the image side S8 of the fourth lens L4 are both spherical surfaces. In this embodiment, the image side S7 of the third lens L3 corresponds to the object side S7 of the fourth lens L4, and the third lens L3 and the fourth lens L4 are combined into a composite lens having positive refractive power.

[0173] The fifth lens L5 has negative refractive power, the object side S9 of the fifth lens L5 is a concave surface, and the image side S10 of the fifth lens L5 is a convex surface. In this embodiment, the object side S9 and the image side S10 of the fifth lens L5 are both aspherical surfaces.

[0174] In addition, the optical imaging lens 300 further comprises an infrared filter L6 and a protective glass L7. The infrared filter L6 has an object side S11 formed on the side facing the object side and an image side S12 formed on the side facing the image side. The infrared filter L6 is located on the side of the image side S10 of the fifth lens L5, and is used to limit the infrared spectrum received by the optical imaging lens 300, thereby improving the image quality and authenticity. The protective glass L7 has an object side S13 formed on the side facing the object side and an image side S14 formed on the side facing the image side. The protective glass L7 is arranged on the side of the infrared filter L6 and located between the infrared filter L6 and an imaging plane Im, and is used to protect the infrared filter L6.

[0175] In order to ensure that the optical imaging lens 300 of the present application can maintain good optical performance and high-level imaging quality, in the third embodiment, the optical imaging lens 300 satisfies the following conditional expressions:

[0176] (1) -17.00 < F / fg1 < -12.00;

[0177] (2) -0.50 < F / fg2 < -0.30;

[0178] (3) -0.76 < F / f1 < -0.73;

[0179] (4) 0.78 < F / f2 < 0.8;

[0180] (5) -0.49 < F / f3 < -0.46;

[0181] (6) 1.30 < F / f4 < 1.35;

[0182] (7) -0.89 < F / f5 < -0.83;

[0183] (8) -0.80 < fg2 / (R1+R2+R3+R4+R6+R7+R8+R9+R10) < -0.30;

[0184] (9) -1.50 < fg2 / (R6+R7+R8+R9+R10) < -0.80;

[0185] (10) -0.80 < fg1 / (R1+R2+R3+R4+R6+R7+R8+R9+R10) < -0.60;

[0186] (11) -1.60 < fg1 / (R1+R2+R3+R4) < -1.50;

[0187] (12) -2.00 < F / R1 < -1.50;

[0188] (13) -0.80 < F / R2 < -0.60;

[0189] (14) 0.55 < F / R3 < 0.65;

[0190] (15) -0.70 < F / R4 < -0.55;

[0191] (16) 1.00 < F / R6 < 1.60;

[0192] (17) 1.90 < F / R7 < 2.00;

[0193] (18) -0.45 < F / R8 < -0.35;

[0194] (19) -3.00 < F / R9 < -2.95;

[0195] (20) -1.80 < F / R10 < -1.70.

[0196] Wherein, F is the focal length of the optical imaging lens 300, f1 is the focal length of the first lens L1, f2 is the focal length of the second lens L2, f3 is the focal length of the third lens L3, f4 is the focal length of the fourth lens L4, f5 is the focal length of the fifth lens L5, fg1 is the combined focal length of the first lens group G1, fg2 is the combined focal length of the second lens group G2, R1 is the radius of curvature of the object side S1 of the first lens L1, R2 is the radius of curvature of the image side S2 of the first lens L1, R3 is the radius of curvature of the object side S3 of the second lens L2, R4 is the radius of curvature of the image side S4 of the second lens L2, R6 is the radius of curvature of the object side S6 of the third lens L3, R7 is the common radius of curvature of the image side S7 of the third lens L3 and the object side S7 of the fourth lens L4, R8 is the radius of curvature of the image side S8 of the fourth lens L4, R9 is the radius of curvature of the object side S9 of the fifth lens L5, and R10 is the radius of curvature of the image side S10 of the fifth lens L5.

[0197] The following Table 5 is the optical data of the optical imaging lens 300 of the third embodiment of the present application, including the focal length F (or effective focal length) of the optical imaging lens 300, the aperture value Fno, the field of view FOV, the radius of curvature R of each lens, the distance between each surface and the next surface on the optical axis Z, the refractive index Nd of each lens, the dispersion, and the focal length of each lens. The units of the focal length, the radius of curvature, and the distance are mm.

[0198] Table 5, optical data table of the optical imaging lens of the third embodiment

[0199]

[0200]

[0201] From the above Table 5, it can be seen that the focal length F of the optical imaging lens 100 of the third embodiment is 14.905 mm, the aperture value Fno is 1.712, the field of view FOV is 35.6 degrees, the focal length f1 of the first lens L1 is -20.328 mm, the focal length f2 of the second lens L2 is 19.109 mm, the focal length f3 of the third lens L3 is -32.323 mm, the focal length f4 of the fourth lens L4 is 11.401 mm, the focal length f5 of the fifth lens L5 is -17.888 mm, the cemented focal length f34 of the third lens L3 and the fourth lens L4 forming a composite lens is 18.438 mm, the combined focal length fg1 of the first lens group G1 is 49.182 mm, and the combined focal length fg2 of the second lens group G2 is 36.038 mm.

[0202] Further, based on the above detailed parameters, the specific numerical values of the aforementioned conditional expressions in the third embodiment are as follows:

[0203] (1) F / fg1 = 0.303;

[0204] (2) F / fg2 = 0.414;

[0205] (3) F / f1 = -0.733;

[0206] (4) F / f2 = 0.780;

[0207] (5) F / f3 = -0.461;

[0208] (6) F / f4 = 1.307;

[0209] (7) F / f5 = -0.833;

[0210] (8) fg2 / (R1+R2+R3+R4+R6+R7+R8+R9+R10) = -0.553;

[0211] (9) fg2 / (R6+R7+R8+R9+R10) = -1.069;

[0212] (10) fg1 / (R1+R2+R3+R4+R6+R7+R8+R9+R10) = -0.755;

[0213] (11) fg1 / (R1+R2+R3+R4) = -1.563;

[0214] (12) F / R1 = -1.670;

[0215] (13) F / R2 = -0.661;

[0216] (14) F / R3 = 0.611;

[0217] (15) F / R4 = -0.611;

[0218] (16) F / R6 = 1.287;

[0219] (17) F / R7 = 1.919;

[0220] (18) F / R8 = -0.397;

[0221] (19) F / R9 = -2.827;

[0222] (20) F / R10 = -1.456.

[0223] From the data of Table 5, the focal length of the first lens L1 to the focal length of the fifth lens L5, the combined focal length fg1 of the first lens group G1, the combined focal length fg2 of the second lens group G2, and the radius of curvature of the first lens L1 to the fifth lens L5 of the third embodiment satisfy the ratio condition formula of the aforementioned (1) to (20) points of the optical imaging lens 300.

[0224] It is worth mentioning that the aspherical surface profile shape Z of the object side S1 and the image side S2 of the first lens L1 and the object side S9 and the image side S10 of the fifth lens L5 of the third embodiment are obtained by the following formula:

[0225]

[0226] wherein,

[0227] Z: aspherical surface profile shape;

[0228] c: reciprocal of the radius of curvature;

[0229] h: off-axis half height of the surface;

[0230] k: conic constant;

[0231] A2, A4, A6, A8, A10, A12, A14, and A16: each order coefficient of the off-axis half height h of the surface.

[0232] In the optical imaging lens 300 of the third embodiment of the present application, the conic constant k and the A2, A4, A6, A8, A10, A12, A14, and A16 order coefficients of each aspherical surface are shown in the following Table 6:

[0233] Table 6, conic coefficient table of each aspherical surface of the third embodiment

[0234] Surface Number S1 S2 S9 S10 k -4.24E-01 -6.66E-01 -1.84E+00 -4.73E+00 A2 0 0 0 0 A4 1.99E-04 2.07E-04 -3.62E-05 7.04E-04 A6 5.11E-06 2.66E-06 5.41E-05 5.75E-06 A8 -3.41E-07 -1.05E-07 -6.73E-06 2.19E-06 A10 1.68E-08 3.81E-09 3.42E-07 -3.86E-07 A12 -3.82E-10 -4.80E-11 -3.61E-09 2.37E-08 A14 3.09E-12 0 -1.58E-10 -5.09E-10 A16 0 0 0 0

[0235] Subsequently, the imaging quality of the optical imaging lens 300 is verified by optical simulation data. Figure 3B For the longitudinal chromatic aberration diagram of the third embodiment of the present application, Figure 3C For the transverse chromatic aberration diagram of the third embodiment of the present application. From Figure 3B and Figure 3C The results of the optical imaging lens 300 of the present embodiment can verify that the design described above can effectively improve the imaging quality.

[0236] The above merely describes preferred and feasible embodiments of the present application, and it should be noted that the data listed in the above table is not intended to limit the present application, and any person skilled in the art can make appropriate changes to the parameters or settings after referring to the present application, which should be within the scope of the present application. Any equivalent changes made in accordance with the description and claims of the present application should be included in the patent scope of the present application.

Claims

1. An optical imaging lens comprising, in order from an object side to an image side along an optical axis: a first lens group consisting of a first lens and a second lens arranged along the optical axis from the object side to the image side; wherein the first lens has negative refractive power, the object side surface of the first lens is concave, and the image side surface of the first lens is convex; the second lens has positive refractive power; a stop; and a second lens group consisting of a third lens, a fourth lens, and a fifth lens arranged along the optical axis from the object side to the image side; wherein the third lens has negative refractive power; the fourth lens has positive refractive power; the fifth lens has negative refractive power, the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is convex.

2. The optical imaging lens of claim 1, wherein the image side surface of the third lens and the object side surface of the fourth lens are cemented to form a composite lens having positive refractive power, and the first lens and the second lens and the fourth lens and the fifth lens have an air space therebetween along the optical axis, respectively.

3. The optical imaging lens of claim 1, wherein the second lens is a biconvex lens, the object side surface of the third lens is convex, the image side surface of the third lens is concave, and the fourth lens is a biconvex lens.

4. The optical imaging lens of claim 1, wherein the object side surface and the image side surface of the first lens are aspherical, the object side surface and the image side surface of the second lens are spherical, the object side surface and the image side surface of the third lens are spherical, the object side surface and the image side surface of the fourth lens are spherical, and the object side surface and the image side surface of the fifth lens are aspherical.

5. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following condition: -17.00 < F / fgi < -12.00, wherein, F is a focal length of the optical imaging lens, and fg1 is a combined focal length of the first lens group.

6. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies the following condition: -0.50 < F / fg2 < -0.30, wherein, F is a focal length of the optical imaging lens, and fg2 is a combined focal length of the second lens group.

7. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following condition: -0.76 < F / fi < -0.73, where F is the focal length of the optical imaging lens and fi is the focal length of the first lens element. F is a focal length of the optical imaging lens, and f1 is a focal length of the first lens.

8. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies the following condition: 0.78 < F / f2 < 0.8, where F is the focal length of the optical imaging lens and f2 is the focal length of the second lens group. F is a focal length of the optical imaging lens, and f2 is a focal length of the second lens.

9. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies the following condition: -0.49 < F / f3 < -0.46, where F is the focal length of the optical imaging lens and f3 is the focal length of the third lens group. F is a focal length of the optical imaging lens, and f3 is a focal length of the third lens.

10. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following condition: 1.30 < F / f4 < 1.35, where F is the focal length of the optical imaging lens and f4 is the focal length of the fourth lens group. F is a focal length of the optical imaging lens, and f4 is a focal length of the fourth lens.

11. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following condition: -0.89 < F / f5 < -0.83, where F is the focal length of the optical imaging lens and f5 is the focal length of the fifth lens element. F is a focal length of the optical imaging lens, and f5 is a focal length of the fifth lens.

12. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies the following condition: -0.80 < fg2 / (R1+R2+R3+R4+R6+R7+R8+R9+R10) < -0.30, where, fg2 is a combined focal length of the second lens group, R1 is a radius of curvature of the object side surface of the first lens, R2 is a radius of curvature of the image side surface of the first lens, R3 is a radius of curvature of the object side surface of the second lens, R4 is a radius of curvature of the image side surface of the second lens, R6 is a radius of curvature of the object side surface of the third lens, R7 is a common radius of curvature of the image side surface of the third lens and the object side surface of the fourth lens, R8 is a radius of curvature of the image side surface of the fourth lens, R9 is a radius of curvature of the object side surface of the fifth lens, and R10 is a radius of curvature of the image side surface of the fifth lens.

13. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following condition: -1.50 < fg2 / (R6+R7+R8+R9+R10) < -0.80, wherein, fg2 is a combined focal length of the second mirror group, R6 is a radius of curvature of the object side surface of the third lens, R7 is a common radius of curvature of the image side surface of the third lens and the object side surface of the fourth lens, R8 is a radius of curvature of the image side surface of the fourth lens, R9 is a radius of curvature of the object side surface of the fifth lens, and R10 is a radius of curvature of the image side surface of the fifth lens.

14. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies the following condition: -0.80 < fg1 / (R1+R2+R3+R4+R6+R7+R8+R9+R10) < -0.60, where, fg1 is a combined focal length of the first mirror group, R1 is a radius of curvature of the object side surface of the first lens, R2 is a radius of curvature of the image side surface of the first lens, R3 is a radius of curvature of the object side surface of the second lens, R4 is a radius of curvature of the image side surface of the second lens, R6 is a radius of curvature of the object side surface of the third lens, R7 is a common radius of curvature of the image side surface of the third lens and the object side surface of the fourth lens, R8 is a radius of curvature of the image side surface of the fourth lens, R9 is a radius of curvature of the object side surface of the fifth lens, and R10 is a radius of curvature of the image side surface of the fifth lens.

15. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following condition: -1.60 < fg1 / (R1+R2+R3+R4) < -1.50, wherein, fg1 is a combined focal length of the first mirror group, R1 is a radius of curvature of the object side surface of the first lens, R2 is a radius of curvature of the image side surface of the first lens, R3 is a radius of curvature of the object side surface of the second lens, and R4 is a radius of curvature of the image side surface of the second lens.

16. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies the following condition: -2.00 < F / R1 < -1.50, wherein, F is a focal length of the optical imaging lens, and R1 is a radius of curvature of the object side surface of the first lens.

17. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies the following condition: -0.80 < F / R2 < -0.60, where F is the focal length of the optical imaging lens and R2 is the second aspheric coefficient of the optical imaging lens. F is a focal length of the optical imaging lens, and R2 is a radius of curvature of the image side surface of the first lens.

18. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies the following condition: 0.55 < F / R3 < 0.65, where, F is a focal length of the optical imaging lens, and R3 is a radius of curvature of the object side surface of the second lens.

19. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies the following condition: -0.70 < F / R4 < -0.55, where, F is a focal length of the optical imaging lens, and R4 is a radius of curvature of the image side surface of the second lens.

20. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following condition: 1.00 < F / R6 < 1.60, where F is the focal length of the optical imaging lens and R6 is the radius of curvature of the sixth surface. F is a focal length of the optical imaging lens, and R6 is a radius of curvature of the object side surface of the third lens.

21. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies the following condition: 1.90 < F / R7 < 2.00, where, F is a focal length of the optical imaging lens, and R7 is a common radius of curvature of the image side surface of the third lens and the object side surface of the fourth lens.

22. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following condition: -0.45 < F / R8 < -0.35, wherein, F is a focal length of the optical imaging lens, and R8 is a radius of curvature of the image side surface of the fourth lens.

23. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following condition: -3.00 < F / R9 < -2.95, wherein, F is a focal length of the optical imaging lens, and R9 is a radius of curvature of the object side surface of the fifth lens.

24. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies the following condition: -1.80 < F / R10 < -1.70, wherein, F is a focal length of the optical imaging lens, and R10 is a radius of curvature of the image side surface of the fifth lens.

Images