An optical imaging lens with high-definition projection technology for car headlights

Abstract

The present invention discloses an optical imaging lens for high-definition projection technology for automotive headlights, comprising a first spherical glass lens, a second spherical glass lens, a third spherical glass lens, a fourth spherical glass lens, a fifth spherical glass lens, a sixth spherical glass lens, and a seventh spherical glass lens, arranged sequentially along the same optical axis from the image side to the object side. The aperture stop of the optical imaging lens is placed between the image side and the first spherical glass lens. The first spherical glass lens is a positive lens, the second spherical glass lens is a negative lens, the third spherical glass lens is a positive lens, the fourth spherical glass lens is a negative lens, the fifth spherical glass lens is a positive lens, the sixth spherical glass lens is a positive lens, and the seventh spherical glass lens is a meniscus lens. This optical imaging lens can ensure clear imaging quality and high illumination brightness in both high and low beam modes, and meet various high-pixel graphic interaction requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging lenses for automobile headlights, and in particular to an optical imaging lens using high-definition projection technology for automobile headlights. Background Art

[0002] In recent years, driven by the need for safe driving and enhanced human-vehicle interaction, automotive headlight projection technology has become a hot topic in the automotive industry. Due to the advantages of LED lamps, such as compact size, low energy consumption, long lifespan, low safety voltage, rich colors, low heat dissipation, and low price, pixel-based LED headlights hold great promise for the future of automotive lighting. However, current pixel-based LED headlights typically use adaptive high-beam (ADB) headlights with 10 to 100 pixels for interactive graphics. This low-pixel projection technology cannot meet the demands for refined interactive graphics. Therefore, the use of high-definition pixel-based micro-LEDs (Micro LEDs) for headlight projection has become an inevitable trend.

[0003] Of course, projecting high-resolution images depends not only on the number of pixels in the pixel-level LED light source, but also on a high-resolution optical imaging lens. Furthermore, to adapt to the operating environment of automotive lighting, the optical imaging lens must also meet the requirements of high and low temperature confocality, clear imaging of high and low beams, and high light source utilization. In this context, developing an optical imaging lens with a large depth of focus, large aperture, and high resolution has become a hot topic. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, the present invention proposes an optical imaging lens with high-definition projection technology for automobile headlights, which can ensure clear imaging quality, high lighting brightness, and various high-pixel graphic interaction requirements in the vehicle's high and low beam states.

[0006] An optical imaging lens for high-definition projection technology for automotive headlights according to an embodiment of the present invention includes a first spherical glass lens, a second spherical glass lens, a third spherical glass lens, a fourth spherical glass lens, a fifth spherical glass lens, a sixth spherical glass lens, and a seventh spherical glass lens, which are arranged in sequence along the same optical axis from the image side to the object side. The aperture stop of the optical imaging lens is placed between the image side and the first spherical glass lens. The first spherical glass lens is a positive lens, the second spherical glass lens is a negative lens, the third spherical glass lens is a positive lens, the fourth spherical glass lens is a negative lens, the fifth spherical glass lens is a positive lens, the sixth spherical glass lens is a positive lens, and the seventh spherical glass lens is a meniscus lens.

[0007] The beneficial effects of the present invention are that, under large aperture conditions, the aberrations of the optical imaging lens are effectively corrected by rationally matching the materials and optical powers of the seven lenses. Simultaneously, by using glass materials with a low thermal expansion coefficient and easily processed spherical lenses, the optical imaging lens can achieve high and low temperature confocality, clear near and far projection effects, high illumination brightness, and high resolution of tens of thousands of pixels when applied to automotive headlight projection technology. Furthermore, the optical imaging lens of the present invention has good single lens tolerance and assembly tolerance, and has good manufacturability.

[0008] According to one embodiment of the present invention, the third spherical glass lens and the fourth spherical glass lens are two independent single lenses, which can effectively correct system spherical aberration and improve the edge resolution effect of the optical imaging lens.

[0009] According to one embodiment of the present invention, the third spherical glass lens and the fourth spherical glass lens form a cemented lens group with a negative optical focus, which can effectively correct the system spherical aberration and improve the edge resolution effect of the optical imaging lens.

[0010] According to one embodiment of the present invention, along the same optical axis direction from the image side to the object side, the first spherical glass lens is a convex-convex lens, the second spherical glass lens is a concave-convex lens or a concave-concave lens, the third spherical glass lens is a convex-concave lens, the fourth spherical glass lens is a concave-concave lens or a convex-concave lens, the fifth spherical glass lens is a concave-convex lens or a convex-convex lens or a convex-concave lens, the sixth spherical glass lens is a convex-convex lens or a convex-concave lens, and the seventh spherical glass lens is a convex-concave lens or a concave-concave lens.

[0011] According to one embodiment of the present invention, the first spherical glass lens includes a first spherical surface and a second spherical surface, the second spherical glass lens includes a third spherical surface and a fourth spherical surface, the third spherical glass lens includes a fifth spherical surface and a sixth spherical surface, the fourth spherical glass lens includes a seventh spherical surface and an eighth spherical surface, the fifth spherical glass lens includes a ninth spherical surface and a tenth spherical surface, the sixth spherical glass lens includes an eleventh spherical surface and a twelfth spherical surface, and the seventh spherical glass lens includes a thirteenth spherical surface and a fourteenth spherical surface, and the first spherical surface, the second spherical surface, the third spherical surface, the fourth spherical surface, the fifth spherical surface, the sixth spherical surface, the seventh spherical surface, the eighth spherical surface, the ninth spherical surface, the tenth spherical surface, the eleventh spherical surface, the twelfth spherical surface, the thirteenth spherical surface and the fourteenth spherical surface are arranged in sequence along the same optical axis direction from the image side to the object side.

[0012] According to one embodiment of the present invention, when the imaging surface of the optical imaging lens is located within a range of 5 to 25 meters from the first spherical surface of the first spherical glass lens, the contrast ratio of the optical imaging lens is greater than 0.3 at a characteristic frequency of 6.25 LP / MM. This ensures that when the optical imaging lens is applied to automotive headlight projection technology, it can project a clear pattern under both high and low beam conditions.

[0013] According to one embodiment of the present invention, the effective focal length from the first spherical glass lens to the second spherical glass lens is set to f1, and the effective focal length of the optical imaging lens is set to f, then 1≤f1 / f≤20.

[0014] According to one embodiment of the present invention, the effective focal length from the sixth spherical glass lens to the seventh spherical glass lens is set to f2, and the effective focal length of the optical imaging lens is set to f, then 0.3≤f2 / f≤5.

[0015] According to one embodiment of the present invention, the refractive index Nd of at least one of the first spherical glass lens and the seventh spherical glass lens is ≥1.8.

[0016] According to one embodiment of the present invention, the aperture diameter of the first spherical glass lens is set to D, and the total optical length of the optical imaging lens is set to TTL, then 0.3≤D / TTL≤0.5.

[0017] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 1 is a schematic diagram of the overall structure of the optical imaging lens according to Example 1 of the present invention;

[0021] Figure 2 This is the MTF diagram of the optical imaging lens of Example 1 of the present invention when imaging at a distance of 5m;

[0022] Figure 3 This is the MTF graph of the optical imaging lens of Example 1 of the present invention when imaging at a distance of 8m;

[0023] Figure 4 This is the MTF diagram of the optical imaging lens of Example 1 of the present invention when imaging at a distance of 25m;

[0024] Figure 5 2 is a Through-Focus-MTF graph of the optical imaging lens of Example 1 of the present invention at 25°C (frequency 6.25 LP / MM);

[0025] Figure 6 : This is a Through-Focus-MTF graph of the optical imaging lens of Example 1 of the present invention at -40°C (frequency 6.25 LP / MM);

[0026] Figure 7 2 is a Through-Focus-MTF graph of the optical imaging lens of Example 1 of the present invention at 80°C (frequency 6.25 LP / mm);

[0027] Figure 8 Schematic diagram of the overall structure of the optical imaging lens according to Example 2 of the present invention;

[0028] Figure 9 Schematic diagram of the overall structure of the optical imaging lens according to Example 3 of the present invention;

[0029] Figure 10 Schematic diagram of the overall structure of the optical imaging lens according to Example 4 of the present invention;

[0030] Figure 11 Schematic diagram of the overall structure of the optical imaging lens according to Example 5 of the present invention.

[0031] The numbers in the figure are: 1, first spherical glass lens; 2, second spherical glass lens; 3, third spherical glass lens; 4, fourth spherical glass lens; 5, fifth spherical glass lens; 6, sixth spherical glass lens; 7, seventh spherical glass lens; 8, pixel-level LED light source; 9, optical axis; Stop, aperture stop; S1, first spherical surface; S2, second spherical surface; S3, third spherical surface; S4, fourth spherical surface; S5, fifth spherical surface; S6, sixth spherical surface; S7, seventh spherical surface; S8, eighth spherical surface; S9, ninth spherical surface; S10, tenth spherical surface; S11, eleventh spherical surface; S12, twelfth spherical surface; S13, thirteenth spherical surface; S14, fourteenth spherical surface. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "one side", "the other side", "both sides", "between", "middle", "upper end", "lower end", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections, and may be directly connected or indirectly connected through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0035] The optical imaging lens of the high-definition projection technology for automobile headlights according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0036] An optical imaging lens using high-definition projection technology for automobile headlights includes a first spherical glass lens 1, a second spherical glass lens 2, a third spherical glass lens 3, a fourth spherical glass lens 4, a fifth spherical glass lens 5, a sixth spherical glass lens 6, and a seventh spherical glass lens 7, which are arranged in sequence from the image side to the object side along the same optical axis 9; an aperture stop Stop of the optical imaging lens is placed between the image side and the first spherical glass lens 1, the first spherical glass lens 1 is a positive lens, the second spherical glass lens 2 is a negative lens, the third spherical glass lens 3 is a positive lens, the fourth spherical glass lens 4 is a negative lens, the fifth spherical glass lens 5 is a positive lens, the sixth spherical glass lens 6 is a positive lens, and the seventh spherical glass lens 7 is a meniscus lens.

[0037] Among them, the aperture stop Stop is a component that limits the imaging of a point light source on the optical axis.

[0038] A positive lens (also known as a converging lens) is a lens that is thick in the middle and thin at the edges and has the ability to converge light.

[0039] A negative lens (also known as a diverging lens) is a lens that is thin in the middle and thick around the edges, and has a diverging effect on light.

[0040] Meniscus lenses are divided into positive meniscus lenses and negative meniscus lenses. One side of the meniscus lens is convex and the other side is concave. It can be a converging lens or a diverging lens, which is determined by the refractive index, curvature and radius.

[0041] The optical imaging lens of the present invention includes seven lenses, all of which are made of spherical glass. Under large aperture conditions, a large number of variables provide more room for aberration correction. The reasonable combination of positive and negative optical powers of each lens enables the optical imaging lens to have the advantages of no out-of-focus at high and low temperatures, high illumination brightness, and high resolution of 10,000 pixels. At the same time, the spherical lenses have good tolerances, which is conducive to improving production capacity and reducing costs.

[0042] The first spherical glass lens 1 includes a first spherical surface S1 and a second spherical surface S2, the second spherical glass lens 2 includes a third spherical surface S3 and a fourth spherical surface S4, the third spherical glass lens 3 includes a fifth spherical surface S5 and a sixth spherical surface S6, the fourth spherical glass lens 4 includes a seventh spherical surface S7 and an eighth spherical surface S8, the fifth spherical glass lens 5 includes a ninth spherical surface S9 and a tenth spherical surface S10, and the sixth spherical glass lens 6 includes an eleventh spherical surface S11 and a twelfth spherical surface S12, The seventh spherical glass lens 7 includes a thirteenth spherical surface S13 and a fourteenth spherical surface S14. The first spherical surface S1, the second spherical surface S2, the third spherical surface S3, the fourth spherical surface S4, the fifth spherical surface S5, the sixth spherical surface S6, the seventh spherical surface S7, the eighth spherical surface S8, the ninth spherical surface S9, the tenth spherical surface S10, the eleventh spherical surface S11, the twelfth spherical surface S12, the thirteenth spherical surface S13 and the fourteenth spherical surface S14 are arranged in sequence along the same optical axis 9 from the image side to the object side.

[0043] The third spherical glass lens 3 and the fourth spherical glass lens 4 are two independent single lenses.

[0044] Alternatively, the third spherical glass lens 3 and the fourth spherical glass lens 4 form a cemented lens group with a negative optical focus.

[0045] By combining the third spherical glass lens 3 and the fourth spherical glass lens 4 with positive and negative optical powers or forming a doublet lens group, the system spherical aberration can be effectively corrected and the edge resolution effect of the optical imaging lens can be improved.

[0046] Along the same optical axis 9 direction from the image side to the object side, the first spherical glass lens 1 is a convex-convex lens, the second spherical glass lens 2 is a concave-convex lens or a concave-concave lens, the third spherical glass lens 3 is a convex-concave lens, the fourth spherical glass lens 4 is a concave-concave lens or a convex-concave lens, the fifth spherical glass lens 5 is a concave-convex lens or a convex-convex lens or a convex-concave lens, the sixth spherical glass lens 6 is a convex-convex lens or a convex-concave lens, and the seventh spherical glass lens 7 is a convex-concave lens or a concave-concave lens.

[0047] The refractive index Nd of at least one of the first spherical glass lens 1 and the seventh spherical glass lens 7 is ≥1.8.

[0048] When the imaging plane of the optical imaging lens is located between 5 and 25 meters from the first spherical surface S1 of the first spherical glass lens 1, the contrast ratio of the optical imaging lens is greater than 0.3 at a characteristic frequency of 6.25 LP / mm, i.e., MTF > 30% @ 6.25 LP / mm. MTF is the modulation transfer function, which reflects the contrast and resolution of the optical imaging lens. This ensures that the optical imaging lens of the present invention, when used in automotive headlight projection technology, can project clear images under both high and low beam conditions.

[0049] Assuming the effective focal length from the first spherical glass lens 1 to the second spherical glass lens 2 to be f1, and the effective focal length of the optical imaging lens to be f, then 1≤f1 / f≤20.

[0050] Assuming the effective focal length of the sixth spherical glass lens 6 to the seventh spherical glass lens 7 to be f2, and the effective focal length of the optical imaging lens to be f, 0.3≤f2 / f≤5.

[0051] Assuming the aperture diameter of the first spherical glass lens 1 to be D and the total optical length of the optical imaging lens to be TTL, 0.3≤D / TTL≤0.5. It should be noted that the total optical length TTL is the distance from the surface S1 along the optical axis 9 to the pixel-level LED light source 8.

[0052] The optical imaging lens of the present invention for high-definition projection technology for automotive headlights effectively corrects aberrations of the optical imaging lens under large aperture conditions by rationally matching the materials and optical powers of seven lens elements. Furthermore, by using glass materials with a low thermal expansion coefficient and easily machined spherical lenses, the optical imaging lens achieves high and low-temperature confocality, clear near and far projection effects, high illumination brightness, and high resolution of tens of thousands of pixels when used in automotive headlight projection technology. Furthermore, the optical imaging lens of the present invention has good single-lens and assembly tolerances, and has good manufacturability.

[0053] The following five groups of specific embodiments are given to specifically illustrate the optical imaging lens of the high-definition projection technology for automobile headlights of the present invention.

[0054] Example 1

[0055] See Figure 1 In this embodiment 1, f1 / f=6.293, f2 / f=1.097, D / TTL=0.348, the lens aperture coefficient F number=0.73, the third spherical glass lens 3 is a single lens with positive optical power, the fourth spherical glass lens 4 is a single lens with negative optical power, wherein the first spherical glass lens 1 is a convex-convex lens, the second spherical glass lens 2 is a concave-convex lens, the third spherical glass lens 3 is a convex-concave lens, the fourth spherical glass lens 4 is a concave-concave lens, the fifth spherical glass lens 5 is a convex-convex lens, the sixth spherical glass lens 6 is a convex-convex lens, and the seventh spherical glass lens 7 is a convex-concave lens; when the imaging plane of the optical imaging lens is within the range of 5m to 25m, the lens resolution MTF is greater than 30% @6.25LP / MM.

[0056] The relevant parameters of each lens in Example 1 are shown in Table 1 below:

[0057]

Table 1

[0058] Surface number Surface type Curvature radius R (unit: mm) Thickness (unit: mm) Refractive index Nd Abbe number Diameter D (unit: mm) Aperture stop spherical surface unlimited -0.2980 20.8956 S1 spherical surface 86.9069 5.9954 1.911 35.3 20.9015 S2 spherical surface -244.0168 4.8921 20.6016 S3 spherical surface -45.6560 2 1.847 23.8 20.2794 S4 spherical surface -98.2767 0.5 20.6333 S5 spherical surface 26.3465 11.3295 1.713 53.8 20.1526 S6 spherical surface 2267.2609 5.3240 19.2277 S7 spherical surface -96.5781 2 1.847 23.8 15.2359 S8 spherical surface 22.9760 4.834 13.1494 S9 spherical surface 281.6378 4.2413 1.911 35.3 13.4304 S10 spherical surface -49.7985 0.5 13.6627 S11 spherical surface 24.8802 6.0843 1.639 55.5 13.5178 S12 spherical surface -1183.9472 0.5 13.0542 S13 spherical surface 14.2165 4.6942 1.911 35.3 10.8075 S14 spherical surface 11.6592 7.1052 8.4316 Physical Surface spherical surface unlimited

[0059] See Figures 2-4 The MTF diagrams of the optical imaging lens of Example 1 of the present invention at 5m, 8m, and 25m are respectively shown.

[0060] See Figures 5-7 The Through-Focus-MTF graphs of the optical imaging lens of Example 1 of the present invention at a frequency of 6.25 LP / MM at temperatures of 25° C., -40° C., and 80° C. are respectively shown.

[0061] The optical imaging lens obtained according to Example 1 of the present invention can achieve an F number of 0.73. When used in automotive headlight projection technology, it can produce clear images under high and low beam conditions, maintains no defocusing in an environment of -40°C to 80°C, and achieves high light source utilization. Example 1 is the best embodiment.

[0062] Example 2

[0063] See Figure 8In this embodiment 2, f1 / f=4.014, f2 / f=0.721, D / TTL=0.354, and the lens aperture coefficient F-number=0.73. The third spherical glass lens 3 and the fourth spherical glass lens 4 form a cemented lens group with negative optical power, wherein the first spherical glass lens 1 is a convex-convex lens, the second spherical glass lens 2 is a concave-convex lens, the third spherical glass lens 3 is a convex-concave lens, the fourth spherical glass lens 4 is a convex-concave lens, the fifth spherical glass lens 5 is a concave-convex lens, the sixth spherical glass lens 6 is a convex-convex lens, and the seventh spherical glass lens 7 is a convex-concave lens. When the imaging plane of the optical imaging lens is within the range of 5m to 25m, the lens resolution MTF is greater than 30% @6.25LP / MM.

[0064] The relevant parameters of each lens in Example 2 are shown in Table 2 below:

[0065]

Table 2

[0066] Surface number Surface type Curvature radius R (unit: mm) Thickness (unit: mm) Refractive index Nd Abbe number Diameter D (unit: mm) Aperture stop spherical surface unlimited -2.0490 21.2477 S1 spherical surface 75.5778 6.8667 1.911 35.3 21.2503 S2 spherical surface -208.5517 4.7549 20.869 S3 spherical surface -49.3965 2.0 1.728 23.8 20.3184 S4 spherical surface -135.7437 0.5 20.3287 S5 spherical surface 27.2139 18.1912 1.911 35.3 19.2338 S6 spherical surface 2231.5526 2 1.946 1.79 14.3257 S7 spherical surface 16.0231 5.8614 11.2700 S8 spherical surface -336.2886 2.699 1.911 35.3 11.5132 S9 spherical surface -78.36245 0.5 11.7931 S10 spherical surface 20.6530 6.5368 1.911 35.3 12.8577 S11 spherical surface -2642.4834 0.5 12.3653 S12 spherical surface 14.1851 2.5101 1.911 35.3 9.9696 S13 spherical surface 11.9477 7.0798 8.5303 Physical Surface spherical surface unlimited

[0067] The optical imaging lens obtained according to Example 2 of the present invention can have an F number of up to 0.73. When used in automobile headlight projection technology, it can produce clear images under high and low beams, without out-of-focus in an environment of -40°C to 80°C, and with high light source utilization.

[0068] Example 3

[0069] See Figure 9 In this embodiment 3, f1 / f=19.5, f2 / f=0.3, D / TTL=0.236, the lens aperture coefficient F-number=0.73, the third spherical glass lens 3 is a single lens with positive optical power, the fourth spherical glass lens 4 is a single lens with negative optical power, wherein the first spherical glass lens 1 is a convex-convex lens, the second spherical glass lens 2 is a concave-concave lens, the third spherical glass lens 3 is a convex-concave lens, the fourth spherical glass lens 4 is a concave-concave lens, the fifth spherical glass lens 5 is a convex-concave lens, the sixth spherical glass lens 6 is a convex-convex lens, and the seventh spherical glass lens 7 is a convex-concave lens; when the imaging plane of the optical imaging lens is within the range of 5m to 25m, the lens resolution MTF is greater than 30% @6.25LP / MM.

[0070] The relevant parameters of each lens in Example 3 are shown in Table 3 below:

[0071]

Table 3

[0072] Surface number Surface type Curvature radius R (unit: mm) Thickness (unit: mm) Refractive index Nd Abbe number Diameter D (unit: mm) Aperture stop spherical surface unlimited -3.050 50.232 S1 spherical surface 415.5799 15.000 1.564 60.7 50.233 S2 spherical surface -148.6754 2.415 50.121 S3 spherical surface -119.4498 21.867 1.660 36.3 50.091 S4 spherical surface 7914.6193 0.01 51.432 S5 spherical surface 91.7633 41.805 1.750 41.3 52.697 S6 spherical surface 1872.9258 49.509 46.547 S7 spherical surface -71.4904 1.5 1.899 19.4 28.450 S8 spherical surface 69.0041 0.497 28.852 S9 spherical surface 64.3871 13.918 1.946 17.9 30.109 S10 spherical surface 61.8283 1.150 30.067 S11 spherical surface 70.7457 13.478 1.887 36.0 30.156 S12 spherical surface -90.4944 0.227 30.280 S13 spherical surface 40.31468 46.814 1.911 35.3 27.537 S14 spherical surface 38.2403 4.129 9.167 Physical Surface spherical surface unlimited

[0073] The optical imaging lens obtained according to Example 3 of the present invention can have an F number of up to 0.73. When used in automobile headlight projection technology, it can produce clear images under high and low beams, without out-of-focus in an environment of -40°C to 80°C, and has a high light source utilization rate.

[0074] Example 4

[0075] See Figure 10 In this embodiment 4, f1 / f=1.49, f2 / f=1.1, D / TTL=0.4, the lens aperture coefficient F-number=0.73, the third spherical glass lens 3 and the fourth spherical glass lens 4 form a cemented lens group with negative optical power, wherein the first spherical glass lens 1 is a convex-convex lens, the second spherical glass lens 2 is a concave-convex lens, the third spherical glass lens 3 is a convex-concave lens, the fourth spherical glass lens 4 is a concave-concave lens, the fifth spherical glass lens 5 is a concave-convex lens, the sixth spherical glass lens 6 is a convex-concave lens, and the seventh spherical glass lens 7 is a convex-concave lens; when the lens imaging plane is within the range of 5m to 25m, the lens resolution MTF is greater than 30% @6.25LP / MM.

[0076] The relevant parameters of each lens of Example 4 are shown in Table 4 below:

[0077]

Table 4

[0078] Surface number Surface type Curvature radius R (unit: mm) Thickness (unit: mm) Refractive index Nd Abbe number Diameter D (unit: mm) Aperture stop spherical surface unlimited -9.2961 46.6547 S1 spherical surface 94.7771 19.0787 1.911 35.3 46.6722 S2 spherical surface -339.9590 2.5591 45.7153 S3 spherical surface -190.6139 3.2479 1.675 39.8 45.6309 S4 spherical surface -684.0974 2.3194 43.7342 S5 spherical surface 42.6993 18.2858 1.558 61.9 33.4283 S6 spherical surface 78338.9479 0.1690 31.8490 S7 spherical surface -9047.1710 8.6221 1.936 18.1 31.5936 S8 spherical surface 39.5973 11.8300 23.1436 S9 spherical surface -65.3004 12.5700 1.895 18.8 23.1041 S10 spherical surface -58.1063 8.8423 23.6956 S11 spherical surface 40.1789 2.6793 1.590 56.0 17.3575 S12 spherical surface 52.2952 6.5388 16.8515 S13 spherical surface 26.4415 15.3127 1.800 39.0 14.2632 S14 spherical surface 28.2948 4.3074 8.5457 Physical Surface spherical surface unlimited

[0079] The optical imaging lens obtained according to Example 4 of the present invention has an F number of up to 0.73. When used in automobile headlight projection technology, it can produce clear images under high and low beams, without out-of-focus in an environment of -40°C to 80°C, and has a high light source utilization rate.

[0080] Example 5

[0081] See Figure 11 In this embodiment 5, f1 / f=4.15, f2 / f=5.0, D / TTL=0.25, the lens aperture coefficient F number=0.73, the third spherical glass lens 3 is a single lens with positive optical power, the fourth spherical glass lens 4 is a single lens with negative optical power, wherein the first spherical glass lens 1 is a convex-convex lens, the second spherical glass lens 2 is a concave-convex lens, the third spherical glass lens 3 is a convex-concave lens, the fourth spherical glass lens 4 is a concave-concave lens, the fifth spherical glass lens 5 is a convex-convex lens, the sixth spherical glass lens 6 is a convex-convex lens, and the seventh spherical glass lens 7 is a concave-concave lens; when the lens imaging plane is within the range of 5m to 25m, the lens resolution MTF is greater than 30% @6.25LP / MM.

[0082] The relevant parameters of each lens of Example 5 are shown in Table 5 below:

[0083]

Table 5

[0084] Surface number Surface type Curvature radius R thickness Refractive index Nd Abbe number Caliber D Aperture stop spherical surface unlimited -6.1156 38.8503 S1 spherical surface 126.4470 25 1.750 41.4 38.8503 S2 spherical surface -195.3941 8.8443 36.7781 S3 spherical surface -97.1147 21.5144 1.738 23.7 34.1809 S4 spherical surface -523.1273 37.2059 33.6757 S5 spherical surface 41.7260 13.3917 1.911 35.3 29.5696 S6 spherical surface 984.6319 5.1138 28.8860 S7 spherical surface -256.4488 1.5 1.782 21.9 25.0578 S8 spherical surface 32.4760 5.6459 21.0479 S9 spherical surface 100.9480 5.0181 1.911 35.3 21.0402 S10 spherical surface -168.7020 0.1 20.8362 S11 spherical surface 33.6347 6.9282 1.762 40.7 18.1581 S12 spherical surface -1747.2494 0.1069 17.4320 S13 spherical surface -1600.1700 19.5641 1.946 17.9 17.3100 S14 spherical surface 34.3085 4.0977 8.6092 Physical Surface spherical surface unlimited

[0085] The optical imaging lens obtained according to Example 5 of the present invention can have an F number of up to 0.73. When used in automobile headlight projection technology, it can produce clear images under high and low beams, without out-of-focus in an environment of -40°C to 80°C, and has a high light source utilization rate.

[0086] When the optical imaging lens of the high-definition projection technology of the present invention is used in automobile headlights, the pixel-level LED light source 8 emits a patterned light beam from the object side, which passes through the optical imaging lens and ultimately obtains an enlarged, high-definition, lossless image on the image side. The seven-element optical imaging lens has more variables in correcting aberrations, which is greatly beneficial for improving image resolution.

[0087] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An optical imaging lens using high-definition projection technology for automotive headlights, characterized by: The optical imaging lens has a total number of seven lenses, including a first spherical glass lens (1), a second spherical glass lens (2), a third spherical glass lens (3), a fourth spherical glass lens (4), a fifth spherical glass lens (5), a sixth spherical glass lens (6) and a seventh spherical glass lens (7) arranged in sequence along the same optical axis (9) from the image side to the object side; The aperture stop (Stop) of the optical imaging lens is placed between the image side and the first spherical glass lens (1), the first spherical glass lens (1) is a positive lens, the second spherical glass lens (2) is a negative lens, the third spherical glass lens (3) is a positive lens, the fourth spherical glass lens (4) is a negative lens, the fifth spherical glass lens (5) is a positive lens, the sixth spherical glass lens (6) is a positive lens, and the seventh spherical glass lens (7) is a meniscus lens; Along the same optical axis (9) direction from the image side to the object side, the first spherical glass lens (1) is a convex-convex lens, the second spherical glass lens (2) is a concave-convex lens or a concave-concave lens, the third spherical glass lens (3) is a convex-concave lens, the fourth spherical glass lens (4) is a concave-concave lens or a convex-concave lens, the fifth spherical glass lens (5) is a concave-convex lens or a convex-convex lens or a convex-concave lens, the sixth spherical glass lens (6) is a convex-convex lens or a convex-concave lens, and the seventh spherical glass lens (7) is a convex-concave lens; When the imaging surface of the optical imaging lens is located within a range of 5m to 25m from the first spherical surface (S1) of the first spherical glass lens (1), the contrast of the optical imaging lens is greater than 0.3 at a characteristic frequency of 6.25LP / MM; The effective combined focal length of the first spherical glass lens (1) and the second spherical glass lens (2) is set to f1, and the effective focal length of the optical imaging lens is set to f, then 1≤f1 / f≤20; The effective combined focal length of the sixth spherical glass lens (6) and the seventh spherical glass lens (7) is set to f2, and the effective focal length of the optical imaging lens is set to f, then 0.3≤f2 / f≤5; Assuming the aperture diameter of the first spherical glass lens (1) to be D, and the total optical length of the optical imaging lens to be TTL, then 0.3≤D / TTL≤0.

5.

2. The optical imaging lens system for high-definition projection technology for automotive headlights according to claim 1, characterized in that: The third spherical glass lens (3) and the fourth spherical glass lens (4) are two independent single lenses.

3. The optical imaging lens system for high-definition projection technology for automotive headlights according to claim 1, characterized in that: The third spherical glass lens (3) and the fourth spherical glass lens (4) form a cemented lens group with a negative optical focus.

4. The optical imaging lens system for high-definition projection technology for automotive headlights according to claim 1, characterized in that: The first spherical glass lens (1) includes a first spherical surface (S1) and a second spherical surface (S2), the second spherical glass lens (2) includes a third spherical surface (S3) and a fourth spherical surface (S4), the third spherical glass lens (3) includes a fifth spherical surface (S5) and a sixth spherical surface (S6), the fourth spherical glass lens (4) includes a seventh spherical surface (S7) and an eighth spherical surface (S8), the fifth spherical glass lens (5) includes a ninth spherical surface (S9) and a tenth spherical surface (S10), the sixth spherical glass lens (6) includes an eleventh spherical surface (S11) and a twelfth spherical surface (S12), the seventh spherical glass lens (7) includes a ninth spherical surface (S13) and a tenth spherical surface (S14), the eighth spherical glass lens (7) includes a ninth spherical surface (S15) and a tenth spherical surface (S16), the eighth spherical glass lens (7) includes a ninth spherical surface (S17) and a tenth spherical surface (S18), the eighth spherical glass lens (7) includes a ninth spherical surface (S19) and a tenth spherical surface (S20), the eighth spherical glass lens (7) includes a ninth spherical surface (S11) and a tenth spherical surface (S21), the eighth spherical glass lens (7) includes a ninth spherical surface (S12) and a tenth spherical surface (S22), the eighth spherical glass lens (7) includes a ninth spherical surface (S13) and a tenth spherical surface (S23), the eighth spherical glass lens (7) includes a ninth spherical surface (S14) The mirror (7) includes a thirteenth spherical surface (S13) and a fourteenth spherical surface (S14), and the first spherical surface (S1), the second spherical surface (S2), the third spherical surface (S3), the fourth spherical surface (S4), the fifth spherical surface (S5), the sixth spherical surface (S6), the seventh spherical surface (S7), the eighth spherical surface (S8), the ninth spherical surface (S9), the tenth spherical surface (S10), the eleventh spherical surface (S11), the twelfth spherical surface (S12), the thirteenth spherical surface (S13) and the fourteenth spherical surface (S14) are arranged in sequence along the same optical axis (9) from the image side to the object side.

5. The optical imaging lens system for high-definition projection technology for automotive headlights according to claim 1, characterized in that: The refractive index Nd of at least one of the first spherical glass lens (1) and the seventh spherical glass lens (7) is ≥1.8.

Images