Optical imaging lens device

Abstract

To provide an optical imaging lens device having an advantage of excellent imaging quality.SOLUTION: An optical imaging lens device includes seven lenses having refractive power including, 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 consists of, in order from the object side to the image side along the optical axis, a first lens having negative refractive power, a second lens having negative refractive power, a third lens having positive refractive power, and a fourth lens having positive refractive power. An image-side surface of the second lens and an object-side surface of the third lens are adhered to form a compound lens. The second lens group consists of, in order from the object side to the image side along the optical axis, a fifth lens having negative refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power.SELECTED DRAWING: Figure 1A

Description

[Technical Field]

[0001] The present invention relates to the application field of optical imaging systems, and in particular to an optical imaging lens arrangement with low distortion and excellent imaging quality. [Background technology]

[0002] In recent years, the popularity of portable electronic devices with photography capabilities has led to growing demand for optical systems. Optical systems typically use charge-coupled devices (CCDs) or complementary metal-oxide semiconductor (CMOS) sensors as their photosensitive elements. As semiconductor manufacturing technology advances, the pixel size of photosensitive elements has become smaller, leading to the development of optical systems with increasingly higher resolution. Furthermore, with the rapid development of unmanned aerial vehicles and self-driving cars, advanced driver assistance systems (ADAS) play an increasingly important role in vehicle safety. These systems utilize various lens devices and sensors to collect real-time environmental information and provide drivers with more comprehensive information. Furthermore, as the temperature of vehicle lens devices changes in response to environmental temperature changes, the quality of lens devices must also improve to meet temperature needs, resulting in increased demands for imaging quality.

[0003] Generally, a good imaging lens device has advantages such as low distortion and high resolution. However, in practical applications, small size and cost must also be considered. Therefore, it is one of the difficult problems for designers to design a lens device with good imaging quality despite various constraints. Summary of the Invention [Problem to be solved by the invention]

[0004] In view of this, the present invention aims to provide an optical imaging lens arrangement that has the advantage of excellent imaging quality. [Means for solving the problem]

[0005] To achieve the above object, the present invention provides an optical imaging lens device having seven lenses with refractive power, including a first lens group, an aperture, and a second lens group, arranged in order from the object side to the image side along the optical axis. The first lens group is composed of a first lens, a second lens, a third lens, and a fourth lens, arranged along the optical axis from the object side to the image side, where the first lens has negative refractive power, the second lens has negative refractive power, and the third lens has positive refractive power, and the image-side surface of the second lens is adhered to the object-side surface of the third lens to form a first compound lens, and the fourth lens has positive refractive power. The second lens group includes a fifth lens, a sixth lens, and a seventh lens, arranged along the optical axis from the object side to the image side, where the fifth lens has negative refractive power, the sixth lens has positive refractive power, and the seventh lens has negative refractive power. [Effects of the Invention]

[0006] The advantages of the present invention are as follows: the optical imaging lens device has at least seven lenses arranged as optical components, and the refractive power of the optical imaging lens device is precisely arranged to meet specific requirements, thereby achieving excellent imaging quality; and the optical imaging lens device includes a compound lens, which can significantly improve the color difference of the lens device and effectively suppress the occurrence of aberrations. [Brief explanation of the drawings]

[0007] [Figure 1A] 1 is a schematic diagram showing the configuration of an optical imaging lens device according to a first embodiment of the present invention. [Figure 1B] FIG. 3 is a vertical color difference diagram of the optical imaging lens device according to the first embodiment of the present invention. [Figure 1C] 3 is a horizontal color difference diagram of the optical imaging lens device according to the first embodiment of the present invention; FIG. [Figure 2A] FIG. 10 is a schematic diagram showing the configuration of an optical imaging lens device according to a second embodiment of the present invention. [Figure 2B] FIG. 10 is a vertical color difference diagram of the optical imaging lens device according to the second embodiment of the present invention. [Figure 2C] FIG. 6 is a lateral color difference diagram of the optical imaging lens device according to the second embodiment of the present invention. [Figure 3A] FIG. 10 is a schematic diagram showing the configuration of an optical imaging lens device according to a third embodiment of the present invention. [Figure 3B] FIG. 10 is a vertical color difference diagram of the optical imaging lens device according to the third embodiment of the present invention. [Figure 3C] FIG. 10 is a horizontal color difference diagram of the optical imaging lens device according to the third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0008] To more clearly explain the present invention, preferred embodiments will be described in detail below with reference to the drawings. Referring to FIG. 1A, an optical imaging lens device 100 according to a first embodiment of the present invention includes a first lens group G1, an aperture ST, and a second lens group G2, arranged in this order from the object side to the image side along an optical axis Z. In the first embodiment, the optical imaging lens device 100 has at least seven lenses, of which the first lens group G1 is composed of a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4, arranged along the optical axis Z from the object side to the image side, and the second lens group G2 is composed of a fifth lens L5, a sixth lens L6, and a seventh lens L7, arranged along the optical axis Z from the object side to the image side.

[0009] The first lens L1 has negative refractive power, and the object side surface S1 of the first lens L1 is a convex surface, and the image side surface S2 of the first lens L1 is a concave surface, of which the object side surface S1 and the image side surface S2 of the first lens L1 are both aspherical.

[0010] The second lens L2 is a biconcave lens having negative refractive power, and both the object-side surface S3 and the image-side surface S4 of the second lens L2 are spherical. In the first embodiment, there is an air gap between the object-side surface S3 of the second lens L2 and the image-side surface S2 of the first lens L1 on the optical axis Z. This means that the first lens L1 and the second lens L2 are not adhered to each other to form a compound lens.

[0011] The third lens L3 is a biconvex lens having positive refractive power, and both the object-side surface S4 and the image-side surface S5 of the third lens L3 are spherical. In the first embodiment, the object-side surface S4 of the third lens L3 is bonded to the image-side surface S4 of the second lens L2, thereby combining the second lens L2 and the third lens L3 into a compound lens having negative refractive power.

[0012] The fourth lens L4 is a biconvex lens having positive refractive power, and both the object-side surface S6 and the image-side surface S7 of the fourth lens L4 are spherical. In the first embodiment, there is an air gap between the object-side surface S6 of the fourth lens L4 and the image-side surface S5 of the third lens L3 on the optical axis Z. This means that the third lens L3 and the fourth lens L4 are not adhered to each other to form a compound lens.

[0013] The fifth lens L5 has negative refractive power, and the object side surface S9 of the fifth lens L5 is a convex surface, and the image side surface S10 of the fifth lens L5 is a concave surface, of which the object side surface S9 and the image side surface S10 of the fifth lens L5 are both spherical surfaces.

[0014] The sixth lens L6 is a biconvex lens having positive refractive power, and both the object-side surface S10 and the image-side surface S11 of the sixth lens L6 are spherical. In the first embodiment, the object-side surface S10 of the sixth lens L3 is bonded to the image-side surface S10 of the fifth lens L5, thereby combining the fifth lens L5 and the sixth lens L6 into a compound lens having positive refractive power.

[0015] The seventh lens L7 has negative refractive power, and the object-side surface S12 of the seventh lens L7 is convex at a portion where the optical axis Z passes, and the image-side surface S13 of the seventh lens L7 is concave at a portion where the optical axis Z passes, with both the object-side surface S12 and the image-side surface S13 of the seventh lens L7 being aspherical, and the object-side surface S12 of the seventh lens L7 having an inflection point. As a result, the object-side surface S12 of the seventh lens L7 gradually changes from a convex surface to a concave surface away from the central point where the optical axis Z passes. Similarly, the image-side surface S13 of the seventh lens L7 also has an inflection point. As a result, the image-side surface S13 of the seventh lens L7 gradually changes from a concave surface to a convex surface away from the central point where the optical axis Z passes. In the first embodiment, there is an air gap between the object-side surface S12 of the seventh lens L7 and the image-side surface S11 of the sixth lens L6 on the optical axis Z. This means that the sixth lens L6 and the seventh lens L7 are not adhered to each other to form a compound lens.

[0016] The optical imaging lens device 100 further includes an infrared filter L8 and a protective glass L9. The infrared filter L8 forms an object-side surface S14 on its surface facing the object side and an image-side surface S15 on its surface facing the image side. The infrared filter L8 is located on one side of the image-side surface S13 of the seventh lens L7 and limits the infrared spectrum received by the optical imaging lens device 100 to improve image quality and realism. The protective glass L9 forms an object-side surface S16 on its surface facing the object side and an image-side surface S17 on its surface facing the image side. The protective glass L9 is located on one side of the infrared filter L8 and is positioned between the infrared filter L8 and the image plane Im to protect the infrared filter L8.

[0017] To ensure that the optical imaging lens device 100 of the present invention maintains excellent optical performance and high level of imaging quality, in a first embodiment, the optical imaging lens device 100 satisfies the following conditional formula: (1)-0.49 <F / f1<-0.46 (2)-1.27 <F / f2<-1.23 (3) 0.91 <F / f3<0.94 (4)-0.020 <F / f23<-0.007 (5) 0.44 <F / f4<0.46 (6)-0.60 <F / f5<-0.40 (7) 0.84 <F / f6<0.88 (8) 0.25 <F / f56<0.29 (9)-0.04 <F / f7<-0.02 (10) 24.00< fg2<28.00 (11)0.40 <F / fg1<0.60 (12)0.25 <F / fg2<0.27 (13)2.40< F / (f1+f2+f3+f4)<3.00.

[0018] where F is the focal length of the optical imaging lens device 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 adhesive focal length of the compound lens formed by adhering the second lens L2 and the third lens L3 together, 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 adhesive focal length of the compound lens formed by adhering the fifth lens L5 and the sixth lens L6 together, f7 is the focal length of the seventh lens L7, 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.

[0019] Table 1 below lists the optical data of the optical imaging lens device 100 according to the first embodiment of the present invention, including the focal length F (also referred to as the effective focal length), aperture value Fno, field of view FOV, radius of curvature R of each lens, distance from each surface to the next surface along the optical axis Z, refractive index Nd of each lens, dispersion, and focal length of each lens, where the focal length, radius of curvature, and distance are in mm.

[0020] Table 1: Optical data table of the optical imaging lens device according to the first embodiment JPEG2025187955000002.jpg145170

[0021] As can be seen from Table 1 above, the optical imaging lens device 100 according to the first embodiment has a focal length F=6.81 mm, an aperture value Fno=1.67, and a field of view FOV=80.9 degrees, of which the focal length f1 of the first lens L1 is -14.087 mm, the focal length f2 of the second lens L2 is -5.381 mm, the focal length f3 of the third lens L3 is 7.268 mm, and the focal length f4 of the fourth lens L4 is 14.926 mm. mm, the focal length of the fifth lens L5 is f5=-14.037mm, the focal length of the sixth lens L6 is f6=7.782mm, the focal length of the seventh lens L7 is f7=-203.944mm, the adhesive focal length of the compound lens formed by adhering the second lens L2 and the third lens L3 together is f23=-622.622mm, the adhesive focal length of the compound lens formed by adhering the fifth lens L5 and the sixth lens L6 together is f56=24.221mm, the combined focal length of the first lens group G1 is fg1=14.047mm, and the combined focal length of the second lens group G2 is fg2=25.493mm.

[0022] Based on the above detailed parameters, the specific values ​​of the above conditional expressions in the first embodiment are as follows: (1) F / f1=-0.483 (2) F / f2=-1.265 (3) F / f3=0.936 (4) F / f23=-0.011 (5) F / f4=0.456 (6) F / f5=-0.485 (7) F / f6=0.875 (8) F / f56=0.281 (9) F / f7=-0.033 (10)fg2=25.493 (11)F / fg1=0.485 (12)F / fg2=0.267 (13)F / (f1+f2+f3+f4) = 2.497.

[0023] As can be seen from the data in Table 1 above, the focal length of each lens in the first embodiment, the adhesive focal length of each compound lens, the combined focal length fg1 of the first lens group G1, and the combined focal length fg2 of the second lens group G2 all satisfy the proportionality conditional expressions (1) to (13) set for the optical imaging lens device 100.

[0024] In the first embodiment, the optical imaging lens device 100 satisfies the following conditional expression. (14)0.514 <f / R1<0.519 (15)1.354 <f / R2<1.400 (16)-0.993 <f / R3<-0.961 (17)0.673 <f / R4<0.698 (18)-0.699 <f / R5<-0.674 (19)0.552 <f / R6<0.565 (20)-0.054 <f / R7<-0.050 (21)0.820 <f / R9<0.842 (22)1.529 <f / R10<1.595 (23)-0.223 <f / R11 <-0.207 (24)0.265 <f / R12<0.276 (25)0.30< F / R13<0.40.

[0025] where F is the focal length of the optical imaging lens device 100, R1 is the radius of curvature of the object-side surface S1 of the first lens L1, R2 is the radius of curvature of the image-side surface S2 of the first lens L1, R3 is the radius of curvature of the object-side surface S3 of the second lens L2, R4 is the radius of curvature of the image-side surface S4 of the second lens L2 that is attached to the object-side surface S4 of the third lens L3, R5 is the radius of curvature of the image-side surface S5 of the third lens L3, and R6 is the radius of curvature of the object-side surface of the fourth lens L4. R11 is the radius of curvature of the image-side surface S11 of the sixth lens L6, R12 is the radius of curvature of the object-side surface S12 of the seventh lens L7, and R13 is the radius of curvature of the image-side surface S13 of the seventh lens L7.

[0026] Based on the detailed parameters in Table 1 above, in the first embodiment, the specific values ​​of the conditional expressions (14) to (25) are as follows: (14)f / R1=0.518 (15)f / R2=1.391 (16)f / R3=-0.987 (17)f / R4=0.692 (18)f / R5=-0.692 (19)f / R6=0.562 (20)f / R7=-0.052 (21)f / R9=0.841 (22)f / R10=1.590 (23)f / R11=-0.222 (24)f / R12=0.273 (25)f / R13=0.345.

[0027] According to the data in Table 1 above, the respective related values ​​in the first embodiment all satisfy the conditional expressions (14) to (25) set for the optical imaging lens device 100.

[0028] The contour shapes Z of the aspheric surfaces of the object side surface S1 and the image side surface S2 of the first lens L1 and the object side surface S12 and the image side surface S13 of the seventh lens L7 in the first example are obtained by the following equation. JPEG2025187955000003.jpg15161Of these, Z is the surface profile of the aspheric surface, c is the reciprocal of the radius of curvature, h is half the off-axis height at the surface; k is the conic constant, A2, A4, A6, A8, A10, A12 and A14 are the orders of the coefficients of half the off-axis height h at the surface.

[0029] In the optical imaging lens device 100 according to the first embodiment of the present invention, the conic constant k, A2, A4, A6, A8, A10, A12 and A14 of each aspheric surface have orders as shown in Table 2 below.

[0030] Table 2: Conic coefficient table for each aspherical surface according to the first embodiment JPEG2025187955000004.jpg54170

[0031] Next, the imaging quality of the optical imaging lens device 100 will be verified based on optical simulation data. Figure 1B shows a vertical color difference diagram for the first embodiment. Observing this diagram, the curves formed by each wavelength are quite close to each other, so that off-axis light rays from each wavelength at different heights converge near the imaging point, resulting in significant improvements in color difference and aberration. Observing the diagonal width of each curve, it can be seen that the deviation of the imaging point for off-axis light rays at different heights is limited to within ±0.04 millimeters, demonstrating that the first embodiment achieves significant improvements in color difference for different wavelengths.

[0032] FIG. 1C is a lateral color difference diagram of the first embodiment of the present invention. Observing this diagram, it can be seen that the lateral aberrations of the shortest wavelength and the longest wavelength incident on the imaging plane are each less than 8 micrometers, so the optical imaging lens device 100 has low lateral color difference, and the positions of light rays with different wavelengths on the imaging plane tend to be aligned, which can improve the color accuracy and imaging quality of the image.

[0033] 2A , an optical imaging lens apparatus 200 according to a second embodiment of the present invention includes a first lens group G1, an aperture ST, and a second lens group G2, arranged in this order from the object side to the image side along the optical axis Z. In the second embodiment, the optical imaging lens apparatus 200 includes at least seven lenses, of which the first lens group G1 is composed of a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4, arranged along the optical axis Z from the object side to the image side, and the second lens group G2 is composed of a fifth lens L5, a sixth lens L6, and a seventh lens L7, arranged along the optical axis Z from the object side to the image side.

[0034] The first lens L1 has negative refractive power, and the object side surface S1 of the first lens L1 is a convex surface, and the image side surface S2 of the first lens L1 is a concave surface, of which the object side surface S1 and the image side surface S2 of the first lens L1 are both aspherical.

[0035] The second lens L2 is a biconcave lens having negative refractive power, and both the object-side surface S3 and the image-side surface S4 of the second lens L2 are spherical. In the second embodiment, there is an air gap between the object-side surface S3 of the second lens L2 and the image-side surface S2 of the first lens L1 on the optical axis Z. This means that the first lens L1 and the second lens L2 are not adhered to each other to form a compound lens.

[0036] The third lens L3 is a biconvex lens having positive refractive power, and both the object-side surface S4 and the image-side surface S5 of the third lens L3 are spherical. In the second embodiment, the object-side surface S4 of the third lens L3 is bonded to the image-side surface S4 of the second lens L2, thereby combining the second lens L2 and the third lens L3 into a compound lens having negative refractive power.

[0037] The fourth lens L4 is a biconvex lens having positive refractive power, and both the object-side surface S6 and the image-side surface S7 of the fourth lens L4 are spherical. In the second embodiment, there is an air gap between the object-side surface S6 of the fourth lens L4 and the image-side surface S5 of the third lens L3 on the optical axis Z. This means that the third lens L3 and the fourth lens L4 are not adhered to each other to form a compound lens.

[0038] The fifth lens L5 has negative refractive power, and the object side surface S9 of the fifth lens L5 is a convex surface, and the image side surface S10 of the fifth lens L5 is a concave surface, of which the object side surface S9 and the image side surface S10 of the fifth lens L5 are both spherical surfaces.

[0039] The sixth lens L6 is a biconvex lens having positive refractive power, and both the object-side surface S10 and the image-side surface S11 of the sixth lens L6 are spherical. In the second embodiment, the object-side surface S10 of the sixth lens L6 is bonded to the image-side surface S10 of the fifth lens L5, thereby combining the fifth lens L5 and the sixth lens L6 into a compound lens having positive refractive power.

[0040] The seventh lens L7 has negative refractive power, and the object-side surface S12 of the seventh lens L7 is convex at a portion where the optical axis Z passes, and the image-side surface S13 of the seventh lens L7 is concave at a portion where the optical axis Z passes. Both the object-side surface S12 and the image-side surface S13 of the seventh lens L7 are aspheric, and the object-side surface S12 of the seventh lens L7 has an inflection point. As a result, the object-side surface S12 of the seventh lens L7 gradually changes from a convex surface to a concave surface away from the central point where the optical axis Z passes. The image-side surface S13 of the seventh lens L7 also has an inflection point. As a result, the image-side surface S13 of the seventh lens L7 gradually changes from a concave surface to a convex surface away from the central point where the optical axis Z passes. In the second embodiment, there is an air gap between the object-side surface S12 of the seventh lens L7 and the image-side surface S11 of the sixth lens L6 on the optical axis Z. This means that the sixth lens L6 and the seventh lens L7 are not adhered to each other to form a compound lens.

[0041] The optical imaging lens device 200 further includes an infrared filter L8 and a protective glass L9. The infrared filter L8 forms an object-side surface S14 on its surface facing the object side and an image-side surface S15 on its surface facing the image side. The infrared filter L8 is located on one side of the image-side surface S13 of the seventh lens L7 and limits the infrared spectrum received by the optical imaging lens device 200 to improve image quality and realism. The protective glass L9 forms an object-side surface S16 on its surface facing the object side and an image-side surface S17 on its surface facing the image side. The protective glass L9 is located on one side of the infrared filter L8 and is positioned between the infrared filter L8 and the image plane Im to protect the infrared filter L8.

[0042] In order to ensure that the optical imaging lens device 200 of the present invention maintains excellent optical performance and high level of imaging quality, in the second embodiment, the optical imaging lens device 200 satisfies the following conditional formula: (1)-0.49 <F / f1<-0.46 (2)-1.27 <F / f2<-1.23 (3) 0.91 <F / f3<0.94 (4)-0.020 <F / f23<-0.007 (5) 0.44 <F / f4<0.46 (6)-0.60 <F / f5<-0.40 (7) 0.84 <F / f6<0.88 (8) 0.25 <F / f56<0.29 (9)-0.04 <F / f7<-0.02 (10) 24.00< fg2<28.00 (11)0.40 <F / fg1<0.60 (12)0.25 <F / fg2<0.27 (13)2.40< F / (f1+f2+f3+f4)<3.00.

[0043] where F is the focal length of the optical imaging lens device 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 adhesive focal length of the compound lens formed by adhering the second lens L2 and the third lens L3 together, 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 adhesive focal length of the compound lens formed by adhering the fifth lens L5 and the sixth lens L6 together, f7 is the focal length of the seventh lens L7, 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.

[0044] Table 3 below shows the optical data of the optical imaging lens device 200 according to the second embodiment of the present invention, including the focal length F (also referred to as the effective focal length), aperture value Fno, field of view FOV, radius of curvature R of each lens, distance from each surface to the next surface along the optical axis Z, refractive index Nd of each lens, dispersion, and focal length of each lens, where the focal length, radius of curvature, and distance are in mm.

[0045] Table 3: Optical data table of the optical imaging lens device according to the second embodiment JPEG2025187955000005.jpg145170

[0046] As can be seen from Table 3 above, the optical imaging lens device 200 according to the second embodiment has a focal length F=6.63 mm, an aperture value Fno=1.62, and a field of view FOV=83.8 degrees, of which the focal length of the first lens L1 is f1=-14.286 mm, the focal length of the second lens L2 is f2=-5.382 mm, the focal length of the third lens L3 is f3=7.268 mm, and the focal length of the fourth lens L4 is f4=14.777 mm. mm, the focal length of the fifth lens L5 is f5=-14.507mm, the focal length of the sixth lens L6 is f6=7.864mm, the focal length of the seventh lens L7 is f7=-204.142mm, the adhesive focal length of the compound lens formed by adhering the second lens L2 and the third lens L3 together is f23=-626.460mm, the adhesive focal length of the compound lens formed by adhering the fifth lens L5 and the sixth lens L6 together is f56=23.568mm, the combined focal length of the first lens group G1 is fg1=13.777mm, and the combined focal length of the second lens group G2 is fg2=24.733mm.

[0047] Based on the above detailed parameters, the specific values ​​of the conditional expressions in the second embodiment are as follows: (1) F / f1=-0.464 (2) F / f2 = -1.232 (3) F / f3=0.912 (4) F / f23=-0.011 (5) F / f4=0.449 (6) F / f5=-0.457 (7) F / f6=0.843 (8) F / f56=0.281 (9) F / f7=-0.032 (10)fg2=24.733 (11)F / fg1=0.481 (12)F / fg2=0.268 (13)F / (f1+f2+f3+f4) = 2.789.

[0048] Based on the data in Table 3 above, it can be seen that in the second embodiment, the focal length of each lens, the adhesive focal length of each compound lens, the combined focal length fg1 of the first lens group G1, and the combined focal length fg2 of the second lens group G2 all satisfy the proportionality conditions (1) to (13) set for the optical imaging lens device 200.

[0049] In the second embodiment, the optical imaging lens device 200 satisfies the following conditional expression. (14)0.514 <f / R1<0.519 (15)1.354 <f / R2<1.400 (16)-0.993 <f / R3<-0.961 (17)0.673 <f / R4<0.698 (18)-0.699 <f / R5<-0.674 (19)0.552 <f / R6<0.565 (20)-0.054 <f / R7<-0.050 (21)0.820 <f / R9<0.842 (22)1.529 <f / R10<1.595 (23)-0.223 <f / R11<-0.207 (24)0.265 <f / R12<0.276 (25)0.30< F / R13<0.40.

[0050] where F is the focal length of the optical imaging lens device 200, R1 is the radius of curvature of the object-side surface S1 of the first lens L1, R2 is the radius of curvature of the image-side surface S2 of the first lens L1, R3 is the radius of curvature of the object-side surface S3 of the second lens L2, R4 is the radius of curvature of the image-side surface S4 of the second lens L2 that is attached to the object-side surface S4 of the third lens L3, R5 is the radius of curvature of the image-side surface S5 of the third lens L3, and R6 is the radius of curvature of the object-side surface of the fourth lens L4. R11 is the radius of curvature of the image-side surface S11 of the sixth lens L6, R12 is the radius of curvature of the object-side surface S12 of the seventh lens L7, and R13 is the radius of curvature of the image-side surface S13 of the seventh lens L7.

[0051] Based on the detailed parameters in the above table 3, the specific values ​​of the conditional expressions (14) to (25) in the second embodiment are as follows: (14)f / R1=0.515 (15)f / R2=1.355 (16)f / R3=-0.962 (17)f / R4=0.674 (18)f / R5=-0.675 (19)f / R6=0.553 (20)f / R7=-0.051 (21)f / R9=0.821 (22)f / R10=1.530 (23)f / R11=-0.216 (24)f / R12=0.266 (25)f / R13=0.336.

[0052] According to the data in Table 3 above, the relevant values ​​in the second embodiment all satisfy the conditional expressions (14) to (25) set for the optical imaging lens device 200.

[0053] The contour shapes Z of the aspheric surfaces of the object side surface S1 and the image side surface S2 of the first lens L1 and the object side surface S12 and the image side surface S13 of the seventh lens L7 in the second example are obtained by the following equation. JPEG2025187955000006.jpg15161Of these, Z is the surface profile of the aspheric surface, c is the reciprocal of the radius of curvature, h is half the off-axis height at the surface; k is the conic constant, A2, A4, A6, A8, A10, A12 and A14 are the orders of the coefficients of half the off-axis height h at the surface.

[0054] In the optical imaging lens device 200 according to the second embodiment of the present invention, the conic constant k, A2, A4, A6, A8, A10, A12 and A14 of each aspheric surface have orders as shown in Table 4 below.

[0055] Table 4: Conic coefficient table for each aspherical surface according to the second embodiment JPEG2025187955000007.jpg54170

[0056] Next, the imaging quality of the optical imaging lens device 200 will be verified based on optical simulation data. Figure 2B shows a vertical color difference diagram for the second embodiment. Observing this diagram, the curves formed by each wavelength are quite close to each other, so off-axis light rays from each wavelength at different heights converge near the imaging point, resulting in significant improvements in color difference and aberration. Observing the diagonal width of each curve, the deviation of the imaging point for off-axis light rays at different heights is limited to within ±0.04 millimeters, demonstrating that the second embodiment achieves significant improvements in color difference for different wavelengths.

[0057] FIG. 2C is a horizontal color difference diagram of the second embodiment of the present invention. Observing this diagram, it can be seen that the horizontal aberrations of the shortest wavelength and the longest wavelength incident on the imaging plane are both less than 4 micrometers, so the optical imaging lens device 200 has low horizontal color difference, and the positions of light rays with different wavelengths on the imaging plane tend to be aligned, which can improve the color accuracy and imaging quality of the image.

[0058] 3A, an optical imaging lens apparatus 300 according to a third embodiment of the present invention includes a first lens group G1, an aperture ST, and a second lens group G2, arranged in this order from the object side to the image side along the optical axis Z. In the third embodiment, the optical imaging lens apparatus 300 has at least seven lenses, of which the first lens group G1 is composed of a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4, arranged along the optical axis Z from the object side to the image side, and the second lens group G2 is composed of a fifth lens L5, a sixth lens L6, and a seventh lens L7, arranged along the optical axis Z from the object side to the image side.

[0059] The first lens L1 has negative refractive power, and the object side surface S1 of the first lens L1 is a convex surface, and the image side surface S2 of the first lens L1 is a concave surface, of which the object side surface S1 and the image side surface S2 of the first lens L1 are both aspherical.

[0060] The second lens L2 is a biconcave lens having negative refractive power, and both the object-side surface S3 and the image-side surface S4 of the second lens L2 are spherical. In the third embodiment, there is an air gap between the object-side surface S3 of the second lens L2 and the image-side surface S2 of the first lens L1 on the optical axis Z. This means that the first lens L1 and the second lens L2 are not adhered to each other to form a compound lens.

[0061] The third lens L3 is a biconvex lens having positive refractive power, and both the object-side surface S4 and the image-side surface S5 of the third lens L3 are spherical. In the third embodiment, the object-side surface S4 of the third lens L3 is bonded to the image-side surface S4 of the second lens L2, thereby combining the second lens L2 and the third lens L3 into a compound lens having negative refractive power.

[0062] The fourth lens L4 is a biconvex lens having positive refractive power, and both the object-side surface S6 and the image-side surface S7 of the fourth lens L4 are spherical. In the third embodiment, there is an air gap between the object-side surface S6 of the fourth lens L4 and the image-side surface S5 of the third lens L3 on the optical axis Z. This means that the third lens L3 and the fourth lens L4 are not adhered to each other to form a compound lens.

[0063] The fifth lens L5 has negative refractive power, and the object side surface S9 of the fifth lens L5 is a convex surface, and the image side surface S10 of the fifth lens L5 is a concave surface, of which the object side surface S9 and the image side surface S10 of the fifth lens L5 are both spherical surfaces.

[0064] The sixth lens L6 is a biconvex lens having positive refractive power, and both the object-side surface S10 and the image-side surface S11 of the sixth lens L6 are spherical. In the third embodiment, the object-side surface S10 of the sixth lens L6 is bonded to the image-side surface S10 of the fifth lens L5, thereby combining the fifth lens L5 and the sixth lens L6 into a compound lens having positive refractive power.

[0065] The seventh lens L7 has negative refractive power, and the object-side surface S12 of the seventh lens L7 is convex at a portion where the optical axis Z passes, and the image-side surface S13 of the seventh lens L7 is concave at a portion where the optical axis Z passes. Both the object-side surface S12 and the image-side surface S13 of the seventh lens L7 are aspheric, and the object-side surface S12 of the seventh lens L7 has an inflection point. As a result, the object-side surface S12 of the seventh lens L7 gradually changes from a convex surface to a concave surface away from the central point where the optical axis Z passes. The image-side surface S13 of the seventh lens L7 also has an inflection point. As a result, the image-side surface S13 of the seventh lens L7 gradually changes from a concave surface to a convex surface away from the central point where the optical axis Z passes. In the third embodiment, an air gap exists between the object-side surface S12 of the seventh lens L7 and the image-side surface S11 of the sixth lens L6 along the optical axis Z. This means that the sixth lens L6 and the seventh lens L7 are not adhered to each other to form a compound lens.

[0066] The optical imaging lens device 300 further includes an infrared filter L8 and a protective glass L9. The infrared filter L8 forms an object-side surface S14 on its surface facing the object side and an image-side surface S15 on its surface facing the image side. The infrared filter L8 is located on one side of the image-side surface S13 of the seventh lens L7 and limits the infrared spectrum received by the optical imaging lens device 300 to improve image quality and realism. The protective glass L9 forms an object-side surface S16 on its surface facing the object side and a side surface S17 on its surface facing the image side. The protective glass L9 is located on one side of the infrared filter L8 and is positioned between the infrared filter L8 and the image plane Im to protect the infrared filter L8.

[0067] In order to ensure that the optical imaging lens device 300 of the present invention maintains excellent optical performance and high level of imaging quality, in the third embodiment, the optical imaging lens device 300 satisfies the following conditional formula: (1)-0.49 <F / f1<-0.46 (2)-1.27 <F / f2<-1.23 (3) 0.91 <F / f3<0.94 (4)-0.020 <F / f23<-0.007 (5) 0.44 <F / f4<0.46 (6)-0.60 <F / f5<-0.40 (7) 0.84 <F / f6<0.88 (8) 0.25 <F / f56<0.29 (9)-0.04 <F / f7<-0.02 (10) 24.00< fg2<28.00 (11)0.40 <F / fg1<0.60 (12)0.25 <F / fg2<0.27 (13)2.40< F / (f1+f2+f3+f4)<3.00.

[0068] where F is the focal length of the optical imaging lens device 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 adhesive focal length of the compound lens formed by adhering the second lens L2 and the third lens L3 together, 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 adhesive focal length of the compound lens formed by adhering the fifth lens L5 and the sixth lens L6 together, f7 is the focal length of the seventh lens L7, 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.

[0069] Table 5 below lists the optical data of the optical imaging lens device 300 according to the third embodiment of the present invention, including the focal length F (also referred to as the effective focal length), aperture value Fno, field of view FOV, radius of curvature R of each lens, distance from each surface to the next surface along the optical axis Z, refractive index Nd of each lens, dispersion, and focal length of each lens, where the focal length, radius of curvature, and distance are in mm.

[0070] Table 5: Optical data table of the optical imaging lens device of the third embodiment JPEG2025187955000008.jpg151170

[0071] As can be seen from Table 3 above, the optical imaging lens device 300 in the third embodiment has a focal length F=6.84 mm, an aperture value Fno=1.73, and a field of view FOV=81.0 degrees, of which the focal length of the first lens L1 is f1=-14.038 mm, the focal length of the second lens L2 is f2=-5.380 mm, the focal length of the third lens L3 is f3=7.254 mm, and the focal length of the fourth lens L4 is f4=14.949 mm. mm, the focal length of the fifth lens L5 is f5=-13.669 mm, the focal length of the sixth lens L6 is f6=7.850 mm, the focal length of the seventh lens L7 is f7=-241.512 mm, the adhesive focal length of the compound lens formed by adhering the second lens L2 and the third lens L3 together is f23=-797.009 mm, the adhesive focal length of the compound lens formed by adhering the fifth lens L5 and the sixth lens L6 together is f56=25.850 mm, the combined focal length of the first lens group G1 is fg1=13.665 mm, and the combined focal length of the second lens group G2 is fg2=27.062 mm.

[0072] Based on the detailed parameters described above, the specific values ​​of the conditional expressions in the third embodiment are as follows: (1) F / f1=-0.488 (2) F / f2 = -1.272 (3) F / f3=0.943 (4) F / f23=-0.009 (5) F / f4=0.458 (6) F / f5=-0.501 (7) F / f6=0.872 (8) F / f56=0.265 (9) F / f7=-0.028 (10)fg2=27.062 (11)F / fg1=0.501 (12)F / fg2=0.253 (13)F / (f1+f2+f3+f4) = 2.458.

[0073] Based on the data in Table 5 above, in the third embodiment, the focal length of each lens, the adhesive focal length of each compound lens, the combined focal length fg1 of the first lens group G1, and the combined focal length fg2 of the second lens group G2 all satisfy the proportionality conditional expressions (1) to (13) set for the optical imaging lens device 300.

[0074] In the third embodiment, the optical imaging lens device 300 satisfies the following conditional expression. (14)0.514 <f / R1<0.519 (15)1.354 <f / R2<1.400 (16)-0.993 <f / R3<-0.961 (17)0.673 <f / R4<0.698 (18)-0.699 <f / R5<-0.674 (19)0.552 <f / R6<0.565 (20)-0.054 <f / R7<-0.050 (21)0.820 <f / R9<0.842 (22)1.529 <f / R10<1.595 (23)-0.223 <f / R11<-0.207 (24)0.265 <f / R12<0.276 (25)0.30< F / R13<0.40.

[0075] where F is the focal length of the optical imaging lens device 300, R1 is the radius of curvature of the object-side surface S1 of the first lens L1, R2 is the radius of curvature of the image-side surface S2 of the first lens L1, R3 is the radius of curvature of the object-side surface S3 of the second lens L2, R4 is the radius of curvature of the image-side surface S4 of the second lens L2 that is attached to the object-side surface S4 of the third lens L3, R5 is the radius of curvature of the image-side surface S5 of the third lens L3, and R6 is the radius of curvature of the object-side surface of the fourth lens L4. R11 is the radius of curvature of the image-side surface S11 of the sixth lens L6, R12 is the radius of curvature of the object-side surface S12 of the seventh lens L7, and R13 is the radius of curvature of the image-side surface S13 of the seventh lens L7.

[0076] Based on the detailed parameters in Table 3 above, in the third embodiment, the specific values ​​of the conditional expressions (14) to (25) are as follows: (14)f / R1=0.516 (15)f / R2=1.398 (16)f / R3=-0.992 (17)f / R4=0.697 (18)f / R5=-0.698 (19)f / R6=0.564 (20)f / R7=-0.053 (21)f / R9=0.833 (22)f / R10=1.594 (23)f / R11=-0.208 (24)f / R12=0.275 (25)f / R13=0.337.

[0077] According to the data in Table 5 above, the relevant values ​​in the third embodiment all satisfy the conditional expressions (14) to (25) set for the optical imaging lens device 300.

[0078] The contour shapes Z of the aspheric surfaces of the object side surface S1 and the image side surface S2 of the first lens L1 and the object side surface S12 and the image side surface S13 of the seventh lens L7 in the third example are obtained by the following equation. JPEG2025187955000009.jpg15161Of these, Z is the surface profile of the aspheric surface, c is the reciprocal of the radius of curvature, h is half the off-axis height at the surface; k is the conic constant, A2, A4, A6, A8, A10, A12 and A14 are the orders of the coefficients of half the off-axis height h at the surface.

[0079] In the optical imaging lens device 300 according to the third embodiment of the present invention, the conic constant k, A2, A4, A6, A8, A10, A12 and A14 of each aspheric surface have orders as shown in Table 6 below.

[0080] Table 6: Conic coefficient table for each aspherical surface according to the third embodiment JPEG2025187955000010.jpg49170

[0081] Next, the imaging quality of the optical imaging lens device 300 will be verified based on optical simulation data. Figure 3B shows a vertical color difference diagram for the third embodiment. Observing this diagram, the curves formed by each wavelength are quite close to each other, so off-axis light rays from each wavelength at different heights converge near the imaging point, resulting in significant improvements in color difference and aberration. Observing the diagonal width of each curve, the deviation of the imaging point for off-axis light rays at different heights is limited to within ±0.07 millimeters, demonstrating that the third embodiment achieves significant improvements in color difference for different wavelengths.

[0082] FIG. 3C is a horizontal color difference diagram of the third embodiment of the present invention. Observing this diagram, it can be seen that the horizontal aberrations of the shortest and longest wavelengths incident on the imaging plane are both less than 7 micrometers, and therefore the optical imaging lens device 300 has low horizontal color difference, and the positions of light rays with different wavelengths on the imaging plane tend to be aligned, thereby improving the color accuracy and imaging quality of the image.

[0083] The above are merely preferred embodiments of the present invention, and it should be noted that the data in the above tables do not limit the present invention, and anyone skilled in the art can appropriately change these parameters and settings after reading this application without departing from the scope of the present application. Any equivalent substitutions made based on the specification and claims of the present invention are included in the patent scope of the present invention. [Explanation of symbols]

[0084] 100, 200, 300 Optical imaging lens device G1 First lens group G2 Second lens group L1 First lens L2 Second lens L3 Third lens L4 Fourth lens L5 Fifth lens L6 Sixth lens L7 Seventh lens L8 Infrared Filter L9 protective glass Im image plane ST Aperture Z optical axis S1, S3, S4, S6, S9, S10, S12, S14, S16 Object side S2, S4, S5, S7, S10, S11, S13, S15, S17 Image side

Claims

1. 1. An optical imaging lens system having seven lenses with refractive power, comprising: the first lens group, an aperture, and a second lens group, in that order from the object side to the image side along the optical axis; the first lens group is composed of a first lens, a second lens, a third lens, and a fourth lens arranged along the optical axis from the object side to the image side, the first lens has a negative refractive power, the second lens has a negative refractive power, the third lens has a positive refractive power, and the image-side surface of the second lens and the object-side surface of the third lens are adhered to each other to form a compound lens; the fourth lens has a positive refractive power, the second lens group is composed of a fifth lens, a sixth lens, and a seventh lens arranged along the optical axis from the object side to the image side, the fifth lens has a negative refractive power, the sixth lens has a positive refractive power, The seventh lens has negative refractive power.

2. 2. The optical imaging lens device according to claim 1, wherein the compound lens formed by bonding the image-side surface of the second lens and the object-side surface of the third lens together has negative refractive power.

3. 2. The optical imaging lens device according to claim 1, wherein the image-side surface of the fifth lens and the object-side surface of the sixth lens are adhesively bonded together to form a compound lens having a positive refractive power.

4. 3. The optical imaging lens arrangement of claim 2, wherein the second lens is a biconcave lens and the third lens is a biconvex lens.

5. 4. The optical imaging lens apparatus of claim 3, wherein the object-side surface of the fifth lens is convex, the image-side surface of the fifth lens is concave, and the sixth lens is a biconvex lens.

6. 2. The optical imaging lens device of claim 1, wherein the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, the fourth lens is a biconvex lens, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface.

7. the object-side surface and the image-side surface of the first lens are both aspherical, the object-side surface and the image-side surface of the seventh lens are both aspherical, the object-side surface and the image-side surface of the second lens are both spherical surfaces, the object-side surface and the image-side surface of the third lens are both spherical surfaces, the object-side surface and the image-side surface of the fourth lens are both spherical surfaces, the object-side surface and the image-side surface of the fifth lens are both spherical surfaces, 2. The optical imaging lens device of claim 1, wherein both the object-side and image-side surfaces of said sixth lens are spherical.

8. a portion of the object side surface of the seventh lens through which the optical axis passes is a convex surface, the object side surface of the seventh lens is aspherical and has at least one inflection point, 2. The optical imaging lens device according to claim 1, wherein the image-side surface of the seventh lens is concave at a point where the optical axis passes, and the object-side surface of the seventh lens is aspherical and has at least one inflection point.

9. 2. The optical imaging lens system of claim 1, wherein the condition 24.00<fg2<28.00 is satisfied, where fg2 is the combined focal length of the second lens group.

10. 2. The optical imaging lens device of claim 1, wherein the optical imaging lens device satisfies the condition -0.49<F / f1<-0.46, where F is the focal length of the optical imaging lens device and f1 is the focal length of the first lens.

11. 2. The optical imaging lens device of claim 1, wherein the optical imaging lens device satisfies the condition -1.27<F / f2<-1.23, where F is the focal length of the optical imaging lens device and f2 is the focal length of the second lens.

12. 2. The optical imaging lens device of claim 1, wherein the optical imaging lens device satisfies the condition 0.91<F / f3<0.94, where F is the focal length of the optical imaging lens device and f3 is the focal length of the third lens.

13. 2. The optical imaging lens arrangement of claim 1, wherein the optical imaging lens arrangement satisfies the condition 0.44<F / f4<0.46, where F is the focal length of the optical imaging lens arrangement and f4 is the focal length of the fourth lens.

14. 2. The optical imaging lens arrangement of claim 1, wherein the optical imaging lens arrangement satisfies the condition -0.60<F / f5<-0.40, where F is the focal length of the optical imaging lens arrangement and f5 is the focal length of the fifth lens.

15. 2. The optical imaging lens device of claim 1, wherein the optical imaging lens device satisfies the condition 0.84<F / f6<0.88, where F is the focal length of the optical imaging lens device and f6 is the focal length of the sixth lens.

16. 2. The optical imaging lens arrangement of claim 1, wherein the optical imaging lens arrangement satisfies the condition -0.04<F / f7<-0.02, where F is the focal length of the optical imaging lens arrangement and f7 is the focal length of the seventh lens.

17. The optical imaging lens device of claim 2, wherein the condition -0.020<F / f23<-0.007 is satisfied, F is the focal length of the optical imaging lens device, and f23 is the adhesive focal length of the compound lens formed by adhering the second lens and the third lens together.

18. 4. The optical imaging lens device of claim 3, wherein the optical imaging lens device satisfies the condition 0.25<F / f56<0.29, where F is the focal length of the optical imaging lens device, and f56 is the adhesive focal length of the compound lens formed by adhering the fifth lens and the sixth lens together.

19. 2. The optical imaging lens device of claim 1, wherein the optical imaging lens device satisfies the condition 0.40<F / fg1<0.60, where F is the focal length of the optical imaging lens device and fg1 is the combined focal length of the first lens group.

20. 2. The optical imaging lens arrangement of claim 1, wherein the optical imaging lens arrangement satisfies the condition 0.25<F / fg2<0.27, where F is the focal length of the optical imaging lens arrangement and fg2 is the combined focal length of the second lens group.

21. 2. The optical imaging lens device of claim 1, wherein the optical imaging lens device satisfies the condition 2.40< F / (f1+f2+f3+f4)<3.00, where F is the focal length of the optical imaging lens device, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens.

22. 2. The optical imaging lens device of claim 1, wherein the optical imaging lens device satisfies the condition 0.30<F / R13<0.40, where F is the focal length of the optical imaging lens device and R13 is the radius of curvature of the image-side surface of the seventh lens.

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