Large-target-surface large-aperture high-definition optical lens

Abstract

The invention discloses a high-definition optical lens with a large target surface and a large aperture. The high-definition optical lens comprises a front lens group, a diaphragm and a rear lens group which are sequentially and coaxially arranged from an object space to an image space, the front lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are arranged in sequence, and the front lens group has positive focal power; the rear lens group comprises a seventh lens, an eighth lens, a ninth lens and an optical filter which are arranged in sequence; the rear lens group has negative focal power; and the center of the light through hole of the diaphragm is positioned on the optical axis. According to the large-target-surface large-aperture optical lens, the front lens group, the diaphragm and the rear lens group are arranged, each of the front lens group and the rear lens group is provided with a plurality of lenses, and the focal power of the lens is optimized through arrangement and combination of the different lenses, so that the effects of large target surface size, large view field, large aperture, high resolution and high illumination are achieved; and a clear imaging effect is kept in a temperature range of-40 DEG C to 105 DEG C.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical imaging, and in particular relates to a high-definition optical lens with a large target surface and a large aperture. Background Art

[0002] High-definition optical lenses are widely used in various fields. For example, with the rapid development of intelligent driving and in-vehicle security technologies (such as dashcams), the performance of in-vehicle cameras, which serve as the "eyes" of vehicles, directly impacts their accuracy and reliability. Intelligent driving requires a wider field of view to eliminate blind spots, while also requiring the ability to clearly identify small objects (such as pedestrians, traffic signs, and small obstacles) at long distances (using telephoto cameras). This requires lenses with excellent resolution and resolving power. Traditional sensors with smaller image planes, when paired with standard lenses, experience significant degradation in edge image quality at high resolutions (e.g., 8 megapixels and above). Furthermore, vehicles must operate stably in complex lighting environments. Small aperture lenses have limited light transmission, requiring a significant increase in sensor gain (ISO) in low-light conditions. This leads to a surge in image noise, a significant degradation in the signal-to-noise ratio (SNR), and blurred target features, significantly impacting the accuracy of perception algorithms (e.g., pedestrian or animal recognition at night). Driving environments also often experience extreme contrasts between light and dark (e.g., when entering or exiting tunnels or driving against the sun). The lens itself must possess superior optical design to minimize aberrations and be paired with a high dynamic range (HDR) sensor to preserve more scene information and prevent loss of detail due to overexposure or underexposure. Furthermore, the automotive environment demands that the lens maintain stable optical performance despite extreme temperatures, severe vibration, and long-term use. Consequently, traditional automotive lenses, limited by their small image size and relatively narrow aperture, are gradually becoming inadequate in meeting the stringent demands of intelligent driving and in-vehicle safety.

[0003] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0004] The purpose of the present invention is to provide a large-target-area, large-aperture, high-definition optical lens, which optimizes the optical focal length of the lens and achieves the effects of large-target-area, large-aperture, and high-pixel.

[0005] In order to achieve the above-mentioned purpose, a technical solution provided by a specific embodiment of the present invention is as follows: a large-target-area, large-aperture, high-definition optical lens, which includes a front lens group, an aperture and a rear lens group coaxially arranged in sequence from the object side to the image side; the front lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence, and the front lens group has positive optical power; the rear lens group includes a seventh lens, an eighth lens, a ninth lens and a filter arranged in sequence; the rear lens group has negative optical power; the center of the light-through hole of the aperture is located on the optical axis.

[0006] In one or more embodiments of the present invention, in the front lens group, the object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the second lens is concave, and the image side surface is convex; the object side surface of the third lens is convex, and the image side surface is convex; the object side surface of the fourth lens is convex, and the image side surface is concave; the object side surface of the fifth lens is concave, and the image side surface is concave; the object side surface of the sixth lens is convex, and the image side surface is convex.

[0007] In one or more embodiments of the present invention, in the rear lens group, the object side surface of the seventh lens is a plane, and the image side surface is a concave surface; the object side surface of the eighth lens is a convex surface, and the image side surface is a convex surface; the object side surface of the ninth lens is a convex surface, and the image side surface is a convex surface; the object side surface of the filter is a plane, and the image side surface is a plane.

[0008] In one or more embodiments of the present invention, the image-side surface of the fifth lens and the object-side surface of the sixth lens are cemented together; and / or the image-side surface of the seventh lens and the object-side surface of the eighth lens are cemented together.

[0009] In one or more embodiments of the present invention, in the front lens group, the refractive index N1 of the first lens is greater than 1.5, and the Abbe number V1 is less than 69; the refractive index N2 of the second lens is greater than 1.5, and the Abbe number V2 is less than 64.5; the refractive index N3 of the third lens is greater than 1.85, and the Abbe number V3 is less than 39.5; the refractive index N4 of the fourth lens is greater than 1.9, and the Abbe number V4 is less than 32.5; the refractive index N5 of the fifth lens is greater than 1.5, and the Abbe number V5 is less than 64.5; the refractive index N6 of the sixth lens is greater than 1.95, and the Abbe number V6 is less than 25.5; and / or,

[0010] In the rear lens group, the refractive index N7 of the seventh lens is greater than 1.9, and the Abbe number V7 is less than 18; the refractive index N8 of the eighth lens is greater than 1.7, and the Abbe number V8 is less than 48; the refractive index N9 of the ninth lens is greater than 1.8, and the Abbe number V9 is less than 43; the refractive index N 10 >1.5, Abbe number V 10 <64.5.

[0011] In one or more embodiments of the present invention, the curvature radius r, center thickness d, refractive index N, and Abbe number V of the object-side and image-side surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the filter, and the aperture satisfy the following table:

[0012]

[0013] Among them, S1 is the object-side surface of the first lens, S2 is the image-side surface of the first lens; S3 is the object-side surface of the second lens, S4 is the image-side surface of the second lens; S5 is the object-side surface of the third lens, S6 is the image-side surface of the third lens; S7 is the object-side surface of the fourth lens, S8 is the image-side surface of the fourth lens; S9 is the object-side surface of the fifth lens, S10 is the image-side surface of the fifth lens and the object-side surface of the sixth lens; S11 is the image-side surface of the sixth lens; S12 is the aperture, S13 is the object-side surface of the seventh lens, S14 is the image-side surface of the seventh lens and the object-side surface of the eighth lens; S15 is the image-side surface of the eighth lens; S16 is the object-side surface of the ninth lens, S17 is the image-side surface of the ninth lens; S18 is the object-side surface of the filter, and S19 is the image-side surface of the filter.

[0014] In one or more embodiments of the present invention, the vertical distance from the first lens to the image plane is between 25 mm and 35 mm.

[0015] In one or more embodiments of the present invention, the holographic image height Y is ≤ 9.8 mm; and / or the lens aperture number FNO is ≤ 1.8.

[0016] In one or more embodiments of the present invention, the field of view (FOV) is between 90° and 160°.

[0017] In one or more embodiments of the present invention, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the filter are all made of glass.

[0018] Compared with the prior art, the large-target-surface and large-aperture optical lens of the present invention is equipped with a front lens group, an aperture and a rear lens group, and both the front lens group and the rear lens group have multiple lenses. The optical focal length of the lens is optimized through the arrangement and combination of different lenses, thereby achieving a large target surface size, a large field of view, a large aperture, high resolution and high illumination, and maintaining a clear imaging effect within the temperature range of -40°C to +105°C. 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 the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a structural diagram of a large-target-area, large-aperture, high-definition optical lens according to one embodiment of the present invention;

[0021] Figure 2 Schematic diagram of the optical path of a large-area, large-aperture, high-definition optical lens in one embodiment of the present invention;

[0022] Figure 3 Graph showing the modulation transfer function characteristic of a large-area, large-aperture, high-definition optical lens in accordance with an embodiment of the present invention;

[0023] Figure 4 This is a distortion characteristic curve diagram of a large-area, large-aperture, high-definition optical lens in one embodiment of the present invention;

[0024] Figure 5 This is a relative illumination curve of a large-area, large-aperture, high-definition optical lens in one embodiment of the present invention.

[0025] Description of main reference numerals:

[0026] 1-first lens, 2-second lens, 3-third lens, 4-fourth lens, 5-fifth lens, 6-sixth lens, 7-aperture stop, 8-seventh lens, 9-eighth lens, 10-ninth lens, 11-filter, A-imaging plane. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of 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 should fall within the scope of protection of the present invention.

[0028] like Figure 1-2As shown, in one embodiment of the present invention, a large-target-area, large-aperture, high-definition optical lens comprises a front lens group, an aperture 7, and a rear lens group coaxially arranged from the object side to the image side. The front lens group comprises a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, and a sixth lens 6 arranged in sequence. The front lens group has positive optical power. The rear lens group comprises a seventh lens 8, an eighth lens 9, a ninth lens 10, and a filter 11 arranged in sequence. The rear lens group has negative optical power. The imaging plane A is located behind the rear lens group. The center of the light hole of the rear aperture 7 is located on the optical axis.

[0029] In the above embodiment, the optical lens optimizes the optical focal length of the lens by setting a front lens group, an aperture 7 and a rear lens group, and both the front lens group and the rear lens group have multiple lenses, thereby achieving the effect of a large target surface, a large aperture and high pixels.

[0030] In one embodiment, if Figure 1 As shown, the object-side surface of the first lens element 1 in the front lens group is convex, and the image-side surface is concave. The object-side surface of the second lens element 2 is concave, and the image-side surface is convex. The object-side surface of the third lens element 3 is convex, and the image-side surface is convex. The object-side surface of the fourth lens element 4 is convex, and the image-side surface is concave. The object-side surface of the fifth lens element 5 is concave, and the image-side surface is concave. The object-side surface of the sixth lens element 6 is convex, and the image-side surface is convex.

[0031] The seventh lens element 8 in the rear lens group has a flat object-side surface and a concave image-side surface. The eighth lens element 9 has a convex object-side surface and a convex image-side surface. The ninth lens element 10 has a convex object-side surface and a convex image-side surface. The filter 11 has a flat object-side surface and a flat image-side surface.

[0032] Preferably, the image-side surface of the fifth lens element 5 and the object-side surface of the sixth lens element 6 are bonded together. The image-side surface of the seventh lens element 8 and the object-side surface of the eighth lens element 9 are bonded together.

[0033] like Figure 3 As can be seen, the MTF of this lens is ≥0.3 at 120 lp / mm, meeting the requirements of high-definition imaging. By controlling the arrangement of the above-mentioned different lens types and the combination of different lens elements, this optical lens achieves optical power distribution, improving the lens's light throughput and ensuring image quality at the edge of the large target surface.

[0034] Furthermore, in the front lens group, the refractive index N1 of the first lens element 1 is greater than 1.5, and the Abbe number V1 is less than 69. The refractive index N2 of the second lens element 2 is greater than 1.5, and the Abbe number V2 is less than 64.5. The refractive index N3 of the third lens element 3 is greater than 1.85, and the Abbe number V3 is less than 39.5. The refractive index N4 of the fourth lens element 4 is greater than 1.9, and the Abbe number V4 is less than 32.5. The refractive index N5 of the fifth lens element 5 is greater than 1.5, and the Abbe number V5 is less than 64.5. The refractive index N6 of the sixth lens element 6 is greater than 1.95, and the Abbe number V6 is less than 25.5.

[0035] In the rear lens group, the refractive index N7 of the seventh lens element 8 is greater than 1.9, and the Abbe number V7 is less than 18. The refractive index N8 of the eighth lens element 9 is greater than 1.7, and the Abbe number V8 is less than 48. The refractive index N9 of the ninth lens element 10 is greater than 1.8, and the Abbe number V9 is less than 43. The refractive index N 10 >1.5, Abbe number V 10 <64.5.

[0036] Preferably, the curvature radius r, center thickness d, refractive index N, and Abbe number V of the object-side and image-side surfaces of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 8, the eighth lens 9, the ninth lens 10, the filter 11, and the aperture 7 meet the requirements in the following table.

[0037]

[0038]

[0039] Among them, S1 is the object-side surface of the first lens 1, S2 is the image-side surface of the first lens 1; S3 is the object-side surface of the second lens 2, S4 is the image-side surface of the second lens 2; S5 is the object-side surface of the third lens 3, S6 is the image-side surface of the third lens 3; S7 is the object-side surface of the fourth lens 4, S8 is the image-side surface of the fourth lens 4; S9 is the object-side surface of the fifth lens 5, S10 is the image-side surface of the fifth lens 5 and the object-side surface of the sixth lens 6; S11 is the image-side surface of the sixth lens 6; S12 is the aperture 7, S13 is the object-side surface of the seventh lens 8, S14 is the image-side surface of the seventh lens 8 and the object-side surface of the eighth lens 9; S15 is the image-side surface of the eighth lens 9; S16 is the object-side surface of the ninth lens 10, S17 is the image-side surface of the ninth lens 10; S18 is the object-side surface of the filter 11, and S19 is the image-side surface of the filter 11. This arrangement allows the front lens group to increase the field of view, bringing the HD optical lens's FOV to between 90° and 160°. The rear lens group is used for phase correction, allowing the lens to be compatible with large apertures while maintaining a wide viewing angle.

[0040] like Figure 4 As shown, this lens achieves distortion less than 60% through the combined effects of lens power distribution, aperture position, and material refractive index. It also controls lens aberrations and dispersion, improving image quality. In one embodiment, the vertical distance from the first lens 1 to the image plane is between 25mm and 35mm, meaning the total optical length (TTL) of the lens is 35mm ≥ TTL ≥ 25mm. By controlling the total optical length of the lens, the lens size can be controlled to accommodate a wider range of installation environments.

[0041] Furthermore, the lens controls the aperture number FNO≤1.8, the field of view FOV is between 90°-160°, and the focal length of the lens is 4.2mm, so that the full image height Y≤9.8mm, thereby further ensuring the large target area of the lens. Figure 5 As shown, the edge field relative illumination RI of the high-definition optical lens is greater than 63%, avoiding light scattering loss caused by edge astigmatism, thereby ensuring a large target surface while also ensuring imaging quality.

[0042] In one embodiment, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 8, the eighth lens 9, the ninth lens 10, and the filter 11 are all made of glass, preferably glass with a high refractive index. The use of glass ensures imaging quality while also providing greater stability and is adaptable to operating temperatures ranging from -40°C to +105°C.

[0043] In summary, this optical lens utilizes nine glass spherical lenses and one filter. By optimizing the asymmetric lens arrangement, this increases light throughput and ensures image quality even at the edges of a large target surface. This results in a large target surface, wide field of view, large aperture, high resolution, and high illumination, while maintaining clear imaging across a temperature range of -40°C to +105°C. Furthermore, this lens features a 4.2mm short focal length, compatible with 8-megapixel sensors, and boasts a full-field MTF value exceeding 0.3 at 120lp / mm. It is suitable for a variety of applications, including security monitoring, in-vehicle panoramic imaging, and drone aerial photography, achieving both miniaturization and high performance.

[0044] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0045] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A large-area, large-aperture, high-definition optical lens, characterized in that: It includes a front lens group, an aperture and a rear lens group coaxially arranged in sequence from the object side to the image side; The front lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence, and the front lens group has positive optical power; The rear lens group includes a seventh lens, an eighth lens, a ninth lens and a filter arranged in sequence; the rear lens group has negative optical power; and The center of the light hole of the diaphragm is located on the optical axis.

2. The large-area, large-aperture, high-definition optical lens according to claim 1, characterized in that: In the front lens group, the object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the second lens is concave, and the image side surface is convex; the object side surface of the third lens is convex, and the image side surface is convex; the object side surface of the fourth lens is convex, and the image side surface is concave; the object side surface of the fifth lens is concave, and the image side surface is concave; the object side surface of the sixth lens is convex, and the image side surface is convex.

3. The large-area, large-aperture, high-definition optical lens according to claim 1, characterized in that: In the rear lens group, the object side surface of the seventh lens is a plane, and the image side surface is a concave surface; the object side surface of the eighth lens is a convex surface, and the image side surface is a convex surface; the object side surface of the ninth lens is a convex surface, and the image side surface is a convex surface; the object side surface of the filter is a plane, and the image side surface is a plane.

4. The large-area, large-aperture, high-definition optical lens according to claim 1, characterized in that: The image-side surface of the fifth lens and the object-side surface of the sixth lens are bonded together; and / or the image-side surface of the seventh lens and the object-side surface of the eighth lens are bonded together.

5. The large-area, large-aperture, high-definition optical lens according to claim 1, characterized in that: In the front lens group, the refractive index N1 of the first lens is greater than 1.5, and the Abbe number V1 is less than 69; the refractive index N2 of the second lens is greater than 1.5, and the Abbe number V2 is less than 64.5; the refractive index N3 of the third lens is greater than 1.85, and the Abbe number V3 is less than 39.5; the refractive index N4 of the fourth lens is greater than 1.9, and the Abbe number V4 is less than 32.5; the refractive index N5 of the fifth lens is greater than 1.5, and the Abbe number V5 is less than 64.5; the refractive index N6 of the sixth lens is greater than 1.95, and the Abbe number V6 is less than 25.5; and / or, In the rear lens group, the refractive index N7 of the seventh lens is greater than 1.9, and the Abbe number V7 is less than 18; the refractive index N8 of the eighth lens is greater than 1.7, and the Abbe number V8 is less than 48; the refractive index N9 of the ninth lens is greater than 1.8, and the Abbe number V9 is less than 43; the refractive index N 10 >1.5, Abbe number V 10 <64.

5.

6. The large-area, large-aperture, high-definition optical lens according to claim 5, characterized in that: The curvature radius r, center thickness d, refractive index N and Abbe number V of the object side and image side of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens, filter and aperture meet the following table: Among them, S1 is the object-side surface of the first lens, S2 is the image-side surface of the first lens; S3 is the object-side surface of the second lens, S4 is the image-side surface of the second lens; S5 is the object-side surface of the third lens, S6 is the image-side surface of the third lens; S7 is the object-side surface of the fourth lens, S8 is the image-side surface of the fourth lens; S9 is the object-side surface of the fifth lens, S10 is the image-side surface of the fifth lens and the object-side surface of the sixth lens; S11 is the image-side surface of the sixth lens; S12 is the aperture, S13 is the object-side surface of the seventh lens, S14 is the image-side surface of the seventh lens and the object-side surface of the eighth lens; S15 is the image-side surface of the eighth lens; S16 is the object-side surface of the ninth lens, S17 is the image-side surface of the ninth lens; S18 is the object-side surface of the filter, and S19 is the image-side surface of the filter.

7. The large-area, large-aperture, high-definition optical lens according to claim 1, characterized in that: The vertical distance between the first lens and the image plane is between 25 mm and 35 mm.

8. The large-area, large-aperture, high-definition optical lens according to claim 1, characterized in that: Holographic image height Y≤9.8mm; and / or lens aperture number FNO≤1.

8.

9. The large-area, large-aperture, high-definition optical lens according to claim 1, characterized in that: The field of view (FOV) is between 90° and 160°.

10. The large-area, large-aperture, high-definition optical lens according to claim 1, characterized in that: The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the filter are all made of glass.

Images