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 comprises a first lens, a second lens and a third lens which are arranged along the optical axis from the object side to the image side, and the refractive power arrangement of the first lens to the third lens is negative and positive; the second lens group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens which are arranged along the optical axis from the object side to the image side; wherein the refractive power of the fourth lens to the ninth lens is arranged to be positive, negative, positive and positive, and the refractive power of the optical imaging lens is configured through the technical characteristics and meets specific conditions, so that good imaging quality is realized.

Description

Technical Field

[0001] This invention relates to the application field of optical imaging systems; in particular, it relates to an optical imaging lens with low distortion and good imaging quality. Background Technology

[0002] In recent years, with the widespread adoption of photography capabilities in portable electronic products, the demand for optical systems has continued to grow. Typical optical systems employ charge-coupled devices (CCDs) or complementary metal-oxide-semiconductor (CMOS) sensors. Advances in semiconductor manufacturing technology have led to a reduction in pixel size for photosensitive elements, driving optical systems towards higher pixel counts. Simultaneously, the rapid development of drones and autonomous vehicles has made Advanced Driver Assistance Systems (ADAS) crucial for vehicle safety. These systems utilize various lens configurations with sensors to collect real-time environmental information, providing drivers with more comprehensive data. Furthermore, the temperature sensitivity of automotive lenses increases with variations in ambient temperature, thus demanding higher image quality.

[0003] Good imaging lenses typically possess advantages such as low distortion and high resolution. However, in practical applications, factors such as small size and cost must still be considered. Therefore, designing lenses with good image quality under various constraints is a major challenge for designers. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an optical imaging lens with the advantage of good imaging quality.

[0005] To achieve the above objectives, the present invention provides an optical imaging lens, which sequentially includes a first lens group, an aperture, and a second lens group along an optical axis from an object side to an image side. The first lens group includes a first lens, a second lens, and a third lens arranged along the optical axis from the object side to the image side; wherein the first lens is a biconcave lens with negative refractive power; the second lens has positive refractive power; and the third lens has negative refractive power. The second lens group includes a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens arranged along the optical axis from the object side to the image side; wherein the fourth lens, the fifth lens, the seventh lens, and the eighth lens have positive refractive power, and the sixth lens and the ninth lens have negative refractive power.

[0006] The present invention also provides an optical imaging lens, comprising, sequentially from the object side to the image side along an optical axis, a first lens group, an aperture, and a second lens group. The first lens group includes a first lens, a second lens, and a third lens arranged along the optical axis from the object side to the image side; wherein the first lens is a biconcave lens with negative refractive power; the image-side surface of the second lens and the object-side surface of the third lens are bonded together to form a composite lens with positive refractive power; the second lens group includes a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens arranged along the optical axis from the object side to the image side; wherein the fourth lens has positive refractive power; the image-side surface of the fifth lens and the object-side surface of the sixth lens are bonded together to form a composite lens with negative refractive power; the seventh lens has positive refractive power; the eighth lens has positive refractive power; and the ninth lens has negative refractive power.

[0007] The advantage of this invention is that the optical imaging lens is arranged into an optical assembly with at least nine lenses. By precisely configuring the refractive power of the optical imaging lens and meeting specific conditions, good imaging quality can be achieved. In addition, the optical imaging lens includes two compound lenses, which can significantly improve the chromatic aberration of the lens and effectively control the generation of aberrations. Attached Figure Description

[0008] Figure 1A This is a schematic diagram of the structure of the optical imaging lens according to the first embodiment of the present invention.

[0009] Figure 1B This is a longitudinal chromatic aberration diagram of the optical imaging lens according to the first embodiment of the present invention.

[0010] Figure 1C This is a lateral chromatic aberration diagram of the optical imaging lens according to the first embodiment of the present invention.

[0011] Figure 2AThis is a schematic diagram of the structure of the optical imaging lens according to the second embodiment of the present invention.

[0012] Figure 2B This is a longitudinal chromatic aberration diagram of the optical imaging lens according to the second embodiment of the present invention.

[0013] Figure 2C This is a lateral chromatic aberration diagram of the optical imaging lens according to the second embodiment of the present invention.

[0014] Figure 3A This is a schematic diagram of the structure of the optical imaging lens according to the third embodiment of the present invention.

[0015] Figure 3B This is a longitudinal chromatic aberration diagram of the optical imaging lens according to the third embodiment of the present invention.

[0016] Figure 3C This is a lateral chromatic aberration diagram of the optical imaging lens according to the third embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures:

[0018] 100, 200, 300: Optical imaging lenses

[0019] G1: First Shot

[0020] G2: Second Frame Group

[0021] L1: First lens

[0022] L2: Second lens

[0023] L3: Third lens

[0024] L4: Fourth Lens

[0025] L5: Fifth Lens

[0026] L6: Sixth Lens

[0027] L7: Seventh Lens

[0028] L8: Eighth Lens

[0029] L9: Ninth Lens

[0030] L10: Infrared filter

[0031] L11: Protective Glass

[0032] Im: Imaging plane

[0033] ST: Aperture

[0034] Z: Optical axis

[0035] S1, S3, S5, S7, S9, S11, S13, S15, S17, S19, S21: Side surface of the object

[0036] S2, S4, S6, S8, S10, S12, S14, S16, S18, S20, S22: (Image from the side) Detailed Implementation

[0037] To more clearly illustrate the present invention, preferred embodiments are described in detail below with reference to the accompanying drawings. Please refer to... Figure 1A The optical imaging lens 100 of the first embodiment of the present invention includes, sequentially from the object side to the image side along an optical axis Z, a first lens group G1, an aperture ST, and a second lens group G2. In the first embodiment, the optical imaging lens 100 has at least nine lenses, wherein the first lens group G1 includes a first lens L1, a second lens L2, and a third lens L3 arranged from the object side to the image side along the optical axis Z; the second lens group G2 includes a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9 arranged from the object side to the image side along the optical axis Z.

[0038] The first lens L1 is a biconcave lens with negative refractive power, wherein the object-side surface S1 and the image-side surface S2 of the first lens L1 are both spherical, and the optical axis Z passes through the object-side surface S1 and the image-side surface S2.

[0039] The second lens L2 is a biconvex lens with positive refractive power, wherein the object-side surface S3 and the image-side surface S4 of the second lens L2 are both spherical, and the optical axis Z passes through the object-side surface S3 and the image-side surface S4; in the first embodiment, a gap is generated between the image-side surface S2 of the first lens L1 and the object-side surface S3 of the second lens L2 instead of being glued together.

[0040] The third lens L3 is a biconcave lens with negative refractive power, wherein the object-side surface S5 and the image-side surface S6 of the third lens L3 are both spherical, and the optical axis Z passes through the object-side surface S5 and the image-side surface S6; in the first embodiment, the object-side surface S5 of the third lens L3 is glued to the image-side surface S4 of the second lens L2, so that the second lens L2 and the third lens L3 are combined to form a composite lens with positive refractive power.

[0041] 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 aspherical, and the optical axis Z passes through the object-side surface S7 and the image-side surface S8; in the first embodiment, a gap is generated between the image-side surface S6 of the third lens L3 and the object-side surface S7 of the fourth lens L4 instead of being glued together.

[0042] The fifth lens L5 is a biconvex lens with positive refractive power, wherein the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both spherical, and the optical axis Z passes through the object-side surface S9 and the image-side surface S10; in the first embodiment, the image-side surface S8 of the fourth lens L4 and the object-side surface S9 of the fifth lens L5 are spaced apart rather than glued together.

[0043] The sixth lens L6 is a biconcave lens with negative refractive power, wherein the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both spherical, and the optical axis Z passes through the object-side surface S11 and the image-side surface S12; in the first embodiment, the object-side surface S11 of the sixth lens L6 is correspondingly glued to the image-side surface S10 of the fifth lens L5, and the fifth lens L5 and the sixth lens L6 are combined to form a composite lens with negative refractive power.

[0044] The seventh lens L7 is a biconvex lens with positive refractive power, wherein the object-side surface S13 and the image-side surface S14 of the seventh lens L7 are both spherical, and the optical axis Z passes through the object-side surface S13 and the image-side surface S14; in the first embodiment, the image-side surface S12 of the sixth lens L6 and the object-side surface S13 of the seventh lens L7 are spaced apart rather than glued together.

[0045] The eighth lens L8 is a biconvex lens with positive refractive power, wherein the object-side surface S15 and the image-side surface S16 of the eighth lens L8 are both spherical, and the optical axis Z passes through the object-side surface S15 and the image-side surface S16; in the first embodiment, the image-side surface S14 of the seventh lens L7 and the object-side surface S15 of the eighth lens L8 are spaced apart rather than glued together.

[0046] The ninth lens L9 is a biconcave lens with negative refractive power, wherein the object-side surface S17 and the image-side surface S18 of the ninth lens L9 are both spherical, and the optical axis Z passes through the object-side surface S17 and the image-side surface S18. The image-side surface S16 of the eighth lens L8 and the object-side surface S17 of the ninth lens L9 are spaced apart rather than glued together.

[0047] In addition, the optical imaging lens 100 further includes an infrared filter L10 and a protective glass L11. The infrared filter L10 forms an object-side surface S19 on the object-side and an image-side surface S20 on the image-side. The infrared filter L10 is located on one side of the image-side surface S18 of the ninth lens L9 to limit the infrared spectrum received by the optical imaging lens 100, thereby improving the image quality and realism. The protective glass L11 forms an object-side surface S21 on the object-side and an image-side surface S22 on the image-side. The protective glass L11 is disposed on one side of the infrared filter L10 and between the infrared filter L10 and an imaging surface Im to protect the infrared filter L10.

[0048] To ensure that the optical imaging lens 100 of the present invention can maintain good optical performance and high-level imaging quality, the ratio of the focal length of the optical imaging lens 100 to the focal length of each lens satisfies the following condition:

[0049] (1) -1.1 <F / f1<-0.4;

[0050] (2) 0.45 <F / f2<0.9,-0.68<F / f3<-0.01,0.28<F / f23<0.7;

[0051] (3) 0.39 <F / f4<0.96;

[0052] (4) 0.78 <F / f5<1.1,-2.4<F / f6<-1.3,-1.2<F / f56<-0.38;

[0053] (5) 0.48 <F / f7<1.23;

[0054] (6) 0.38 <F / f8<1.1;

[0055] (7) -1.38 <F / f9<-0.62;

[0056] (8) -0.7 <F / fg1<-0.01;

[0057] (9) 0.6 <F / fg2<1.15。

[0058] 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; f23 is the cemented focal length of the composite lens formed by bonding the second lens L2 and the third lens L3; f4 is the focal length of the fourth lens L4; f5 is the focal length of the fifth lens L5; f6 is the focal length of the sixth lens L6; f56 is the cemented focal length of the composite lens formed by bonding the fifth lens L5 and the sixth lens L6; f7 is the focal length of the seventh lens L7; f8 is the focal length of the eighth lens L8; f9 is the focal length of the ninth lens L9; fg1 is the combined focal length of the first lens group G1; and fg2 is the combined focal length of the second lens group G2.

[0059] Table 1 below shows the optical data of the optical imaging lens 100 of the first embodiment of the present invention, including: the focal length F (or effective focal length), aperture value Fno, field of view FOV, radius of curvature R of each lens, distance between each surface and the next surface on the optical axis Z, refractive index Nd of each lens, dispersion, focal length of each lens, cemented focal length of the composite lens formed by bonding the second lens L2 and the third lens L3, and cemented focal length of the composite lens formed by bonding the fifth lens L5 and the sixth lens L6; wherein, the units of focal length, radius of curvature and distance are mm.

[0060] Table 1. Optical Data Sheet of the Optical Imaging Lens in the First Embodiment

[0061]

[0062] As shown in Table 1 above, the optical imaging lens 100 of the first embodiment has a focal length F = 23.00 mm, an aperture value Fno = 1.80, and a field of view (FOV) of 34.61 degrees. Specifically, the first lens L1 has a focal length f1 = -22.32 mm, the second lens L2 has a focal length f2 = 27.60 mm, the third lens L3 has a focal length f3 = -45.15 mm, the fourth lens L4 has a focal length f4 = 27.46 mm, the fifth lens L5 has a focal length f5 = 24.65 mm, and the sixth lens L6 has a focal length f6 = -10.17 mm. The focal length of the seventh lens L7 is f7 = 20.19 mm, the focal length of the eighth lens L8 is f8 = 23.64 mm, the focal length of the ninth lens L9 is f9 = -18.62 mm, the focal length of the composite lens formed by bonding the second lens L2 and the third lens L3 is f23 = 61.96 mm, the focal length of the composite lens formed by bonding the fifth lens L5 and the sixth lens L6 is f56 = -21.41 mm, the combined focal length of the first lens group G1 is fg1 = -39.04 mm, and the combined focal length of the second lens group G2 is fg2 = 22.03 mm.

[0063] Furthermore, based on the detailed parameters described above, the specific values ​​of the aforementioned conditional expression, namely the ratio of the focal length F of the optical imaging lens 100 to the focal lengths of each lens, in the first embodiment are as follows:

[0064] (1) F / f1 = -1.030;

[0065] (2) F / f2=0.833, F / f3=-0.509, F / f23=0.371;

[0066] (3) F / f4 = 0.838;

[0067] (4) F / f5=0.933, F / f6=-2.262, F / f56=-1.074;

[0068] (5) F / f7 = 1.139;

[0069] (6) F / f8 = 0.973;

[0070] (7) F / f9=-1.235;

[0071] (8) F / fg1=-0.589;

[0072] (9) F / fg2=1.044.

[0073] Based on the data in Table 1 above, the focal lengths of the first lens group G1, the second lens group G2 and each lens in the first embodiment, the cemented focal length of the composite lens formed by bonding the second lens L2 and the third lens L3, and the cemented focal length of the composite lens formed by bonding the fifth lens L5 and the sixth lens L6 satisfy the conditions set at points (1) to (9) of the aforementioned optical imaging lens 100, that is, they satisfy the ratio condition of the focal length of the optical imaging lens 100 to the focal length of each lens.

[0074] In addition, the focal length of the optical imaging lens 100 also satisfies the following conditions: f / (f1+f2+f3)=-0.58; f / (f4+f5+f6+f7+f8+f9)=0.34.

[0075] It is worth mentioning that the aspherical surface profile shape Z of the object side surface S7 and image side surface S8 of the fourth lens L4 in the first embodiment is obtained by the following formula:

[0076]

[0077] in,

[0078] Z: Aspherical surface profile shape;

[0079] c: the reciprocal of the radius of curvature;

[0080] h: Off-axis half-height of the surface;

[0081] k: Conic constant;

[0082] A4, A6, A8, A10, A12, A14 and A16: Coefficients of each order of the off-axis half-height h of the surface.

[0083] The conic constant k and the coefficients of orders A4, A6, A8, A10, A12, A14 and A16 of the object side S7 and image side S8 of the fourth lens L4 in the optical imaging lens 100 of the first embodiment of the present invention are shown in Table 2 below:

[0084] Table 2. Conic coefficients of the object-side and image-side surfaces of the fourth lens in the first embodiment.

[0085] Surface number S7 S8 k 0.0000E+00 0.0000E+00 A4 9.1603E-07 6.7160E-06 A6 2.1895E-08 -4.4846E-10 A8 4.2758E-10 1.4180E-09 A10 -1.4574E-12 -2.1572E-11 A12 -3.0850E-15 2.3598E-13 A14 2.4878E-16 -1.2230E-15 A16 -8.28662E-19 3.10909E-18

[0086] Subsequently, the imaging quality of the optical imaging lens 100 was verified using optical simulation data. Figure 1B The diagram shows the longitudinal chromatic aberration of the first embodiment. As can be observed, the curves formed by each wavelength are quite close to each other, indicating that off-axis rays from different heights of each wavelength are concentrated near the imaging point, thus significantly improving chromatic aberration. By observing the skewing of each curve, we can see that the imaging point deviation of off-axis rays at different heights is controlled within ±0.02 mm. Therefore, in the first embodiment, chromatic aberration at different wavelengths is significantly improved.

[0087] Please refer to Figure 1C The figure shows the lateral chromatic aberration diagram of the first embodiment of the present invention. It can be observed from the figure that the lateral aberrations of the shortest wavelength and the longest wavelength incident on the imaging plane are both less than 1 micrometer, indicating that the optical imaging lens 100 has low lateral chromatic aberration and the positions of light of different wavelengths on the image plane tend to be consistent, thereby improving the color accuracy and imaging quality of the image.

[0088] Please refer to Figure 2A The optical imaging lens 200 of the second embodiment of the present invention includes, sequentially from the object side to the image side along an optical axis Z, a first lens group G1, an aperture ST, and a second lens group G2. In the second embodiment, the optical imaging lens 200 has at least nine lenses, wherein the first lens group G1 includes a first lens L1, a second lens L2, and a third lens L3 arranged from the object side to the image side along the optical axis Z; the second lens group G2 includes a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9 arranged from the object side to the image side along the optical axis Z.

[0089] The first lens L1 is a biconcave lens with negative refractive power, wherein the object-side surface S1 and the image-side surface S2 of the first lens L1 are both spherical, and the optical axis Z passes through the object-side surface S1 and the image-side surface S2.

[0090] The second lens L2 is a biconvex lens with positive refractive power, wherein the object-side surface S3 and the image-side surface S4 of the second lens L2 are both spherical, and the optical axis Z passes through the object-side surface S3 and the image-side surface S4; in the second embodiment, a gap is generated between the image-side surface S2 of the first lens L1 and the object-side surface S3 of the second lens L2 instead of being glued together.

[0091] The third lens L3 is a biconcave lens with negative refractive power, wherein the object-side surface S5 and the image-side surface S6 of the third lens L3 are both spherical, and the optical axis Z passes through the object-side surface S5 and the image-side surface S6; in the second embodiment, the object-side surface S5 of the third lens L3 is glued to the image-side surface S4 of the second lens L2, so that the second lens L2 and the third lens L3 are combined to form a composite lens with positive refractive power.

[0092] 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 aspherical, and the optical axis Z passes through the object-side surface S7 and the image-side surface S8; in the second embodiment, a gap is generated between the image-side surface S6 of the third lens L3 and the object-side surface S7 of the fourth lens L4 instead of being glued together.

[0093] The fifth lens L5 is a biconvex lens with positive refractive power, wherein the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both spherical, and the optical axis Z passes through the object-side surface S9 and the image-side surface S10; in the second embodiment, the image-side surface S8 of the fourth lens L4 and the object-side surface S9 of the fifth lens L5 are spaced apart rather than glued together.

[0094] The sixth lens L6 is a biconcave lens with negative refractive power, wherein the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both spherical, and the optical axis Z passes through the object-side surface S11 and the image-side surface S12; in the second embodiment, the object-side surface S11 of the sixth lens L6 is correspondingly glued to the image-side surface S10 of the fifth lens L5, and the fifth lens L5 and the sixth lens L6 are combined to form a composite lens with negative refractive power.

[0095] The seventh lens L7 is a biconvex lens with positive refractive power, wherein the object-side surface S13 and the image-side surface S14 of the seventh lens L7 are both spherical, and the optical axis Z passes through the object-side surface S13 and the image-side surface S14; in the second embodiment, the image-side surface S12 of the sixth lens L6 and the object-side surface S13 of the seventh lens L7 are spaced apart rather than glued together.

[0096] The eighth lens L8 is a biconvex lens with positive refractive power, wherein the object-side surface S15 and the image-side surface S16 of the eighth lens L8 are both spherical, and the optical axis Z passes through the object-side surface S15 and the image-side surface S16; in the second embodiment, a gap is generated between the image-side surface S14 of the seventh lens L7 and the object-side surface S15 of the eighth lens L8 instead of being glued together.

[0097] The ninth lens L9 is a biconcave lens with negative refractive power, wherein the object-side surface S17 and the image-side surface S18 of the ninth lens L9 are both spherical, and the optical axis Z passes through the object-side surface S17 and the image-side surface S18. The image-side surface S16 of the eighth lens L8 and the object-side surface S17 of the ninth lens L9 are spaced apart rather than glued together.

[0098] In addition, the optical imaging lens 200 further includes an infrared filter L10 and a protective glass L11. The infrared filter L10 forms an object-side surface S19 on the object-side and an image-side surface S20 on the image-side. The infrared filter L10 is located on one side of the image-side surface S18 of the ninth lens L9 to limit the infrared spectrum received by the optical imaging lens 100, thereby improving the image quality and realism. The protective glass L11 forms an object-side surface S21 on the object-side and an image-side surface S22 on the image-side. The protective glass L11 is disposed on one side of the infrared filter L10 and between the infrared filter L10 and an imaging surface Im to protect the infrared filter L10.

[0099] To ensure that the optical imaging lens 200 of the present invention maintains good optical performance and high-level imaging quality, the ratio of the focal length of the optical imaging lens 200 to the focal length of each lens satisfies the following condition:

[0100] (1) -1.1 <F / f1<-0.4;

[0101] (2) 0.45 <F / f2<0.9,-0.68<F / f3<-0.01,0.28<F / f23<0.7;

[0102] (3) 0.39 <F / f4<0.96;

[0103] (4) 0.78 <F / f5<1.1,-2.4<F / f6<-1.3,-1.2<F / f56<-0.38;

[0104] (5) 0.48 <F / f7<1.23;

[0105] (6) 0.38 <F / f8<1.1;

[0106] (7) -1.38 <F / f9<-0.62;

[0107] (8) -0.7 <F / fg1<-0.01;

[0108] (9) 0.6 <F / fg2<1.15。

[0109] 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; f23 is the cemented focal length of the composite lens formed by bonding the second lens L2 and the third lens L3; f4 is the focal length of the fourth lens L4; f5 is the focal length of the fifth lens L5; f6 is the focal length of the sixth lens L6; f56 is the cemented focal length of the composite lens formed by bonding the fifth lens L5 and the sixth lens L6; f7 is the focal length of the seventh lens L7; f8 is the focal length of the eighth lens L8; f9 is the focal length of the ninth lens L9; fg1 is the combined focal length of the first lens group G1; and fg2 is the combined focal length of the second lens group G2.

[0110] Table 3 below shows the optical data of the optical imaging lens 200 of the second embodiment of the present invention, including: the focal length F (or effective focal length), aperture value Fno, field of view FOV, radius of curvature R of each lens, distance between each surface and the next surface on the optical axis Z, refractive index Nd of each lens, dispersion, focal length of each lens, cemented focal length of the composite lens formed by bonding the second lens L2 and the third lens L3, and cemented focal length of the composite lens formed by bonding the fifth lens L5 and the sixth lens L6; wherein, the units of focal length, radius of curvature and distance are mm.

[0111] Table 3. Optical Data Sheet of the Optical Imaging Lens in the Second Embodiment

[0112]

[0113]

[0114] As shown in Table 3 above, the optical imaging lens 200 of the second embodiment has a focal length F = 22.10 mm, an aperture value Fno = 1.74, and a field of view (FOV) of 36.30 degrees. Specifically, the first lens L1 has a focal length f1 = -37.27 mm, the second lens L2 has a focal length f2 = 43.55 mm, the third lens L3 has a focal length f3 = -147.87 mm, the fourth lens L4 has a focal length f4 = 48.40 mm, the fifth lens L5 has a focal length f5 = 21.63 mm, and the sixth lens L6 has a focal length f6 = -12.13 mm. The focal length of the seventh lens L7 is f7 = 32.25 mm, the focal length of the eighth lens L8 is f8 = 35.04 mm, the focal length of the ninth lens L9 is f9 = -24.84 mm, the focal length of the composite lens formed by bonding the second lens L2 and the third lens L3 is f23 = 58.57 mm, the focal length of the composite lens formed by bonding the fifth lens L5 and the sixth lens L6 is f56 = -36.04 mm, the combined focal length of the first lens group G1 is fg1 = -231.15 mm, and the combined focal length of the second lens group G2 is fg2 = 28.26 mm.

[0115] Furthermore, based on the detailed parameters described above, the aforementioned conditional expression, namely the ratio of the focal length F of the optical imaging lens 200 to the focal lengths of each lens, has the following specific values ​​in the second embodiment:

[0116] (1) F / f1=-0.593;

[0117] (2) F / f2=0.507, F / f3=-0.149, F / f23=0.377;

[0118] (3) F / f4 = 0.457;

[0119] (4) F / f5=1.022, F / f6=-1.822, F / f56=-0.613;

[0120] (5) F / f7 = 0.685;

[0121] (6) F / f8 = 0.631;

[0122] (7) F / f9=-0.890;

[0123] (8) F / fg1=-0.096;

[0124] (9) F / fg2=0.782.

[0125] Based on the data in Table 3 above, the focal lengths of the first lens group G1, the second lens group G2, and each lens in the second embodiment, the cemented focal length of the composite lens formed by bonding the second lens L2 and the third lens L3, and the cemented focal length of the composite lens formed by bonding the fifth lens L5 and the sixth lens L6 satisfy the conditions set at points (1) to (9) of the aforementioned optical imaging lens 200, that is, they satisfy the ratio condition of the focal length of the optical imaging lens 200 to the focal length of each lens.

[0126] In addition, the focal length of the optical imaging lens 200 also satisfies the following conditions: f / (f1+f2+f3)=-0.16; f / (f4+f5+f6+f7+f8+f9)=0.22.

[0127] It is worth mentioning that the aspherical surface profile shape Z of the object side surface S7 and image side surface S8 of the fourth lens L4 in the second embodiment can be obtained by the following formula:

[0128]

[0129] in,

[0130] Z: Aspherical surface profile shape;

[0131] c: the reciprocal of the radius of curvature;

[0132] h: Off-axis half-height of the surface;

[0133] k: Conic constant;

[0134] A4, A6, A8, A10, A12, A14 and A16: Coefficients of each order of the off-axis half-height h of the surface.

[0135] The optical imaging lens 200 of the second embodiment of the present invention, wherein the conic constant k and the coefficients of each order A4, A6, A8, A10, A12, A14 and A16 of the object side S7 and image side S8 of the fourth lens L4 are shown in Table 4 below:

[0136] Table 4. Conic coefficients of the object-side and image-side surfaces of the fourth lens in the second embodiment.

[0137] Surface number S7 S8 k 0.0000E+00 0.0000E+00 A4 2.2347E-05 2.1432E-05 A6 1.1508E-07 9.2162E-08 A8 6.3545E-10 1.3321E-09 A10 2.1150E-12 -1.3994E-11 A12 -7.1285E-15 2.3016E-13 A14 2.2173E-16 -1.5638E-15 A16 1.03214E-18 8.1306E-18

[0138] Subsequently, the imaging quality of the optical imaging lens 200 was verified using optical simulation data. Figure 2BThe second embodiment shows a longitudinal chromatic aberration diagram. As can be observed, the curves formed by each wavelength are quite close to each other, indicating that off-axis rays from different heights of each wavelength are concentrated near the imaging point, thus significantly improving chromatic aberration. By observing the skewing of each curve, we can see that the imaging point deviation of off-axis rays at different heights is controlled within ±0.02 mm. Therefore, in the second embodiment, chromatic aberration at different wavelengths is significantly improved.

[0139] Please refer to Figure 2C The figure shows the lateral chromatic aberration diagram of the second embodiment of the present invention. As can be observed from the figure, the lateral aberrations of the shortest wavelength and the longest wavelength incident on the imaging plane are both less than 2 micrometers, indicating that the optical imaging lens 200 has low lateral chromatic aberration and the positions of light of different wavelengths on the image plane tend to be consistent, thereby improving the color accuracy and imaging quality of the image.

[0140] Please refer to Figure 3A The optical imaging lens 300 of the third embodiment of the present invention includes, sequentially from the object side to the image side along an optical axis Z, a first lens group G1, an aperture ST, and a second lens group G2. In the third embodiment, the optical imaging lens 300 has at least nine lenses, wherein the first lens group G1 includes a first lens L1, a second lens L2, and a third lens L3 arranged from the object side to the image side along the optical axis Z; the second lens group G2 includes a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9 arranged from the object side to the image side along the optical axis Z.

[0141] The first lens L1 is a biconcave lens with negative refractive power, wherein the object-side surface S1 and the image-side surface S2 of the first lens L1 are both spherical, and the optical axis Z passes through the object-side surface S1 and the image-side surface S2.

[0142] The second lens L2 is a biconvex lens with positive refractive power, wherein the object-side surface S3 and the image-side surface S4 of the second lens L2 are both spherical, and the optical axis Z passes through the object-side surface S3 and the image-side surface S4; in the third embodiment, a gap is generated between the image-side surface S2 of the first lens L1 and the object-side surface S3 of the second lens L2 instead of being glued together.

[0143] The third lens L3 is a biconcave lens with negative refractive power, wherein the object-side surface S5 and the image-side surface S6 of the third lens L3 are both spherical, and the optical axis Z passes through the object-side surface S5 and the image-side surface S6; in the third embodiment, the object-side surface S5 of the third lens L3 is glued to the image-side surface S4 of the second lens L2, so that the second lens L2 and the third lens L3 are combined to form a composite lens with positive refractive power.

[0144] 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 aspherical, and the optical axis Z passes through the object-side surface S7 and the image-side surface S8; in the third embodiment, a gap is generated between the image-side surface S6 of the third lens L3 and the object-side surface S7 of the fourth lens L4 instead of being glued together.

[0145] The fifth lens L5 is a biconvex lens with positive refractive power, wherein the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both spherical, and the optical axis Z passes through the object-side surface S9 and the image-side surface S10; in the third embodiment, the image-side surface S8 of the fourth lens L4 and the object-side surface S9 of the fifth lens L5 are spaced apart rather than glued together.

[0146] The sixth lens L6 is a biconcave lens with negative refractive power, wherein the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both spherical, and the optical axis Z passes through the object-side surface S11 and the image-side surface S12; in the third embodiment, the object-side surface S11 of the sixth lens L6 is correspondingly glued to the image-side surface S10 of the fifth lens L5, and the fifth lens L5 and the sixth lens L6 are combined to form a composite lens with negative refractive power.

[0147] The seventh lens L7 is a biconvex lens with positive refractive power, wherein the object-side surface S13 and the image-side surface S14 of the seventh lens L7 are both spherical, and the optical axis Z passes through the object-side surface S13 and the image-side surface S14; in the third embodiment, the image-side surface S12 of the sixth lens L6 and the object-side surface S13 of the seventh lens L7 are spaced apart rather than glued together.

[0148] The eighth lens L8 is a biconvex lens with positive refractive power, wherein the object-side surface S15 and the image-side surface S16 of the eighth lens L8 are both spherical, and the optical axis Z passes through the object-side surface S15 and the image-side surface S16; in the third embodiment, the image-side surface S14 of the seventh lens L7 and the object-side surface S15 of the eighth lens L8 are spaced apart rather than glued together.

[0149] The ninth lens L9 is a biconcave lens with negative refractive power, wherein the object-side surface S17 and the image-side surface S18 of the ninth lens L9 are both spherical, and the optical axis Z passes through the object-side surface S17 and the image-side surface S18. The image-side surface S16 of the eighth lens L8 and the object-side surface S17 of the ninth lens L9 are spaced apart rather than glued together.

[0150] In addition, the optical imaging lens 300 further includes an infrared filter L10 and a protective glass L11. The infrared filter L10 forms an object-side surface S19 on the object-side and an image-side surface S20 on the image-side. The infrared filter L10 is located on one side of the image-side surface S18 of the ninth lens L9 to limit the infrared spectrum received by the optical imaging lens 100, thereby improving the image quality and realism. The protective glass L11 forms an object-side surface S21 on the object-side and an image-side surface S22 on the image-side. The protective glass L11 is disposed on one side of the infrared filter L10 and between the infrared filter L10 and an imaging surface Im to protect the infrared filter L10.

[0151] To ensure that the optical imaging lens 300 of the present invention maintains good optical performance and high-level imaging quality, the ratio of the focal length of the optical imaging lens 300 to the focal length of each lens satisfies the following condition:

[0152] (1) -1.1 <F / f1<-0.4;

[0153] (2) 0.45 <F / f2<0.9,-0.68<F / f3<-0.01,0.28<F / f23<0.7;

[0154] (3) 0.39 <F / f4<0.96;

[0155] (4) 0.78 <F / f5<1.1,-2.4<F / f6<-1.3,-1.2<F / f56<-0.38;

[0156] (5) 0.48 <F / f7<1.23;

[0157] (6) 0.38 <F / f8<1.1;

[0158] (7) -1.38 <F / f9<-0.62;

[0159] (8) -0.7 <F / fg1<-0.01;

[0160] (9) 0.6 <F / fg2<1.15。

[0161] 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; f23 is the cemented focal length of the composite lens formed by bonding the second lens L2 and the third lens L3; f4 is the focal length of the fourth lens L4; f5 is the focal length of the fifth lens L5; f6 is the focal length of the sixth lens L6; f56 is the cemented focal length of the composite lens formed by bonding the fifth lens L5 and the sixth lens L6; f7 is the focal length of the seventh lens L7; f8 is the focal length of the eighth lens L8; f9 is the focal length of the ninth lens L9; fg1 is the combined focal length of the first lens group G1; and fg2 is the combined focal length of the second lens group G2.

[0162] Table 5 below shows the optical data of the optical imaging lens 300 of the third embodiment of the present invention, including: the focal length F (or effective focal length), aperture value Fno, field of view FOV, radius of curvature R of each lens, distance between each surface and the next surface on the optical axis Z, refractive index Nd of each lens, dispersion, focal length of each lens, cemented focal length of the composite lens formed by bonding the second lens L2 and the third lens L3, and cemented focal length of the composite lens formed by bonding the fifth lens L5 and the sixth lens L6; wherein, the units of focal length, radius of curvature and distance are mm.

[0163] Table 5. Optical Data Sheet of the Optical Imaging Lens in the Third Embodiment

[0164]

[0165]

[0166] As shown in Table 5 above, the optical imaging lens 300 of the third embodiment has a focal length F = 23.10 mm, an aperture value Fno = 2.00, and a field of view (FOV) of 34.91 degrees. Specifically, the first lens L1 has a focal length f1 = -24.75 mm, the second lens L2 has a focal length f2 = 36.01 mm, the third lens L3 has a focal length f3 = -401.09 mm, the fourth lens L4 has a focal length f4 = 46.73 mm, the fifth lens L5 has a focal length f5 = 25.79 mm, and the sixth lens L6 has a focal length f6 = -16.03 mm. The focal length of the seventh lens L7 is f7 = 38.99 mm, the focal length of the eighth lens L8 is f8 = 51.42 mm, the focal length of the ninth lens L9 is f9 = -31.61 mm, the focal length of the composite lens formed by bonding the second lens L2 and the third lens L3 is f23 = 38.83 mm, the focal length of the composite lens formed by bonding the fifth lens L5 and the sixth lens L6 is f56 = -47.06 mm, the combined focal length of the first lens group G1 is fg1 = -187.91 mm, and the combined focal length of the second lens group G2 is fg2 = 29.20 mm.

[0167] Furthermore, based on the detailed parameters described above, the specific values ​​of the aforementioned conditional expression, namely the ratio of the focal length F of the optical imaging lens 300 to the focal lengths of each lens, are as follows in the third embodiment:

[0168] (1) F / f1=-0.933;

[0169] (2) F / f2=0.642, F / f3=-0.058, F / f23=0.595;

[0170] (3) F / f4 = 0.494;

[0171] (4) F / f5=0.896, F / f6=-1.441, F / f56=-0.491;

[0172] (5) F / f7 = 0.592;

[0173] (6) F / f8 = 0.449;

[0174] (7) F / f9=-0.731;

[0175] (8) F / fg1=-0.123;

[0176] (9) F / fg2=0.791.

[0177] Based on the data in Table 5 above, the focal lengths of the first lens group G1, the second lens group G2 and each lens in the third embodiment, the cemented focal length of the composite lens formed by bonding the second lens L2 and the third lens L3, and the cemented focal length of the composite lens formed by bonding the fifth lens L5 and the sixth lens L6 satisfy the conditions set in points (1) to (9) of the aforementioned optical imaging lens 300, that is, they satisfy the ratio condition of the focal length of the optical imaging lens 300 to the focal length of each lens.

[0178] In addition, the focal length of the optical imaging lens 300 also satisfies the following conditions: f / (f1+f2+f3)=-0.06; f / (f4+f5+f6+f7+f8+f9)=0.20.

[0179] It is worth mentioning that the aspherical surface profile shape Z of the object side surface S7 and image side surface S8 of the fourth lens L4 in the third embodiment can be obtained by the following formula:

[0180]

[0181] in,

[0182] Z: Aspherical surface profile shape;

[0183] c: the reciprocal of the radius of curvature;

[0184] h: Off-axis half-height of the surface;

[0185] k: Conic constant;

[0186] A4, A6, A8, A10, A12, A14 and A16: Coefficients of each order of the off-axis half-height h of the surface.

[0187] The optical imaging lens 300 of the third embodiment of the present invention, wherein the conic constant k and the coefficients of each order A4, A6, A8, A10, A12, A14 and A16 of the object side S7 and image side S8 of the fourth lens L4 are shown in Table 6 below:

[0188] Table 6. Conic coefficients of the object-side and image-side surfaces of the fourth lens in the third embodiment.

[0189]

[0190]

[0191] Subsequently, the imaging quality of the optical imaging lens 300 was verified using optical simulation data. Figure 3BThe figure shows the longitudinal chromatic aberration diagram of the third embodiment. It can be observed that the curves formed by each wavelength are quite close to each other, indicating that off-axis rays from different heights of each wavelength are concentrated near the imaging point, thus significantly improving chromatic aberration. By observing the skewing of each curve, we can see that the imaging point deviation of off-axis rays at different heights is controlled within ±0.03 mm. Therefore, in the third embodiment, chromatic aberration at different wavelengths is significantly improved.

[0192] Please refer to Figure 3C The figure shows the lateral chromatic aberration diagram of the third embodiment of the present invention. As can be observed from the figure, the lateral aberrations of the shortest wavelength and the longest wavelength incident on the imaging plane are both less than 3 micrometers, indicating that the optical imaging lens 300 has low lateral chromatic aberration and the positions of light of different wavelengths on the image plane tend to be consistent, thereby improving the color accuracy and imaging quality of the image.

[0193] The above description is merely a preferred embodiment of the present invention. It should be noted that the data listed in the above tables are not intended to limit the present invention. Any person skilled in the art, upon referring to the present invention, may make appropriate modifications to the parameters or settings, and such modifications should fall within the scope of the present invention. All equivalent variations made in accordance with the present invention's specification and claims should be included within the patent scope of the present invention.

Claims

1. An optical imaging lens, comprising, in sequence along an optical axis from an object side to an image side: A first lens group comprises a first lens, a second lens, and a third lens arranged along the optical axis from the object side to the image side; wherein The first lens is a biconcave lens with negative refractive power; the second lens has positive refractive power; and the third lens has negative refractive power. One aperture; and A second lens group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens arranged along the optical axis from the object side to the image side; wherein The fourth lens, the fifth lens, the seventh lens, and the eighth lens have positive refractive power, while the sixth lens and the ninth lens have negative refractive power.

2. The optical imaging lens as claimed in claim 1, wherein the second lens is a biconvex lens; and the third lens is a biconcave lens.

3. The optical imaging lens according to claim 1 or 2, wherein the optical imaging lens satisfies the following condition: -1.1 < F / f1 < -0.4, where, F is the focal length of the optical imaging lens, and f1 is the focal length of the first lens.

4. The optical imaging lens according to claim 1 or 2, wherein the optical imaging lens satisfies the following condition: 0.45 < F / f2 < 0.9, where, F is the focal length of the optical imaging lens, and f2 is the focal length of the second lens.

5. The optical imaging lens according to claim 1 or 2, wherein the optical imaging lens satisfies the following condition: -0.68 < F / f3 < -0.01, where, F is the focal length of the optical imaging lens, and f3 is the focal length of the third lens.

6. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following condition: -0.7 < F / fg1 < -0.01, where, F is the focal length of the optical imaging lens, and fg1 is the combined focal length of the first lens group.

7. The optical imaging lens of claim 1, wherein the fifth lens is a biconvex lens; the sixth lens is a biconcave lens; the seventh lens is a biconvex lens; the eighth lens is a biconvex lens; and the ninth lens is a biconcave lens.

8. The optical imaging lens according to claim 1 or 7, wherein the optical imaging lens satisfies the following condition: 0.39 < F / f4 < 0.96, where, F is the focal length of the optical imaging lens, and f4 is the focal length of the fourth lens.

9. The optical imaging lens of claim 8, wherein the object-side surface and the image-side surface of the fourth lens are both aspherical.

10. The optical imaging lens according to claim 1 or 7, wherein the optical imaging lens satisfies the following condition: 0.78 < F / f5 < 1.1, where, F is the focal length of the optical imaging lens, and f5 is the focal length of the fifth lens.

11. The optical imaging lens according to claim 1 or 7, wherein the optical imaging lens satisfies the following condition: -2.4 < F / f6 < -1.3, where, F is the focal length of the optical imaging lens, and f6 is the focal length of the sixth lens.

12. The optical imaging lens according to claim 1 or 7, wherein the optical imaging lens satisfies the following condition: 0.48 < F / f7 < 1.23, where F is the focal length of the optical imaging lens, and f7 is the focal length of the seventh lens.

13. The optical imaging lens according to claim 1 or 7, wherein the optical imaging lens satisfies the following condition: 0.38 < F / f8 < 1.1, where, F is the focal length of the optical imaging lens, and f8 is the focal length of the eighth lens.

14. The optical imaging lens according to claim 1 or 7, wherein the optical imaging lens satisfies the following condition: -1.38 < F / f9 < -0.62, where F is the focal length of the optical imaging lens, and f9 is the focal length of the ninth lens.

15. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following condition: 0.6 < F / fg2 < 1.15, where, F is the focal length of the optical imaging lens, and fg2 is the combined focal length of the second lens group.

16. An optical imaging lens, comprising, in sequence along an optical axis from an object side to an image side, the following components: A first lens group comprises a first lens, a second lens, and a third lens arranged along the optical axis from the object side to the image side; wherein The first lens is a biconcave lens with negative refractive power; The image-side surface of the second lens is bonded to the object-side surface of the third lens to form a composite lens with positive refractive power; One aperture; as well as A second lens group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens arranged along the optical axis from the object side to the image side; wherein The fourth lens has positive refractive power; The image side of the fifth lens and the object side of the sixth lens are glued together to form a composite lens with negative refractive power; The seventh lens has positive refractive power; The eighth lens has positive refractive power; The ninth lens has negative refractive power.

17. The optical imaging lens according to claim 16, wherein the optical imaging lens satisfies the following condition: 0.28 < F / f23 < 0.7, where, F is the focal length of the optical imaging lens, and f23 is the cemented focal length of the composite lens formed by bonding the second lens and the third lens together.

18. The optical imaging lens according to claim 16, wherein the optical imaging lens satisfies the following condition: -1.2 < F / f56 < -0.38, where, F is the focal length of the optical imaging lens, and f56 is the cemented focal length of the composite lens formed by bonding the fifth lens and the sixth lens together.

19. The optical imaging lens according to any one of claims 16 to 18, wherein the second lens is a biconvex lens; and the third lens is a biconcave lens.

20. The optical imaging lens according to any one of claims 16 to 18, wherein the fifth lens is a biconvex lens; the sixth lens is a biconcave lens; the seventh lens is a biconvex lens; the eighth lens is a biconvex lens; and the ninth lens is a biconcave lens.

21. The optical imaging lens of claim 20, wherein the object-side surface and the image-side surface of the fourth lens are both aspherical.

22. The optical imaging lens according to claim 16, wherein the optical imaging lens satisfies the following condition: -0.7 < F / fg1 < -0.01, where F is the focal length of the optical imaging lens, and fg1 is the combined focal length of the first lens group.

23. The optical imaging lens according to claim 16, wherein the optical imaging lens satisfies the following condition: 0.6 < F / fg2 < 1.15, where, F is the focal length of the optical imaging lens, and fg2 is the combined focal length of the second lens group.

Images