Optical lens with large zoom ratio and camera device with same
By designing a high zoom ratio optical lens and adjusting the interval distance by moving the lens group, the problem of not being able to scale targets of different sizes in the existing technology has been solved, and high-quality imaging and high-precision detection over a wide working distance have been achieved.
Patent Information
- Application Number
- CN202423138738.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-19
AI Technical Summary
Existing vision lenses cannot achieve different scaling ratios for targets of different sizes, resulting in a limited range of observable object sizes and a small usable working distance.
Design an optical lens with a large zoom ratio. By moving the first lens group and the second lens group along the optical axis during the zoom process and adjusting their spacing, focus can be achieved, satisfying the conditions (1), (2), (3), and (4) to ensure high-quality imaging.
It achieves high-quality imaging over a wide working distance range, meeting the requirements of high pixel count, large target area, and low distortion. It can perform large field-of-view detection at low magnification and high-resolution detection in high-precision areas.
Smart Images
Figure CN223650819U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of optical lens technology, specifically relating to an optical lens with a large zoom ratio and a camera device having the same. Background Technology
[0002] Currently, visual lenses available in both domestic and international markets all have a single focal length, making it impossible to scale targets of different sizes at different ratios. This results in limitations such as a limited range of observable object sizes and a narrow usable working distance. Therefore, the development of optical lenses with zoom capabilities and the ability to scale different targets has become an urgent need. Utility Model Content
[0003] To address the technical problems existing in the prior art, the purpose of this utility model is to provide an optical lens with a large zoom ratio and a camera device having the same.
[0004] To achieve the above objectives and technical effects, the technical solution adopted by this utility model is as follows:
[0005] An optical lens with a large zoom ratio includes a first lens group G1 and a second lens group G2 arranged sequentially from the object side to the image side. During zooming, both the first lens group G1 and the second lens group G2 move along the optical axis, and focusing is achieved by changing the distance between the first lens group G1 and the second lens group G2.
[0006] Furthermore, the first lens group G1 satisfies the following condition (1):
[0007]
[0008] Where, β F β N These represent the lateral magnification of the first lens group G1 at its farthest working distance and its closest working distance, respectively.
[0009] Furthermore, the first lens group G1 satisfies the following condition (2):
[0010]
[0011] Where f1 and f2 represent the focal lengths of the first lens group G1 and the second lens group G2, respectively.
[0012] Furthermore, the first lens group G1 satisfies the following condition (3):
[0013]
[0014] Where f is the focal length of an optical lens with a large zoom ratio.
[0015] Furthermore, the optical lens satisfies the following condition (4):
[0016]
[0017] Among them, TTL F TTL N These represent the total optical length of the lens at its farthest working distance and its closest working distance, respectively.
[0018] Furthermore, the optical lenses include a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a tenth lens L10 arranged sequentially from the object side to the image side. The first lens group G1 includes the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7. The second lens group G2 includes the eighth lens L8, the ninth lens L9, and the tenth lens L10.
[0019] Furthermore, the object-side surface of the first lens L1 is convex, and the image-side surface is concave; the object-side surface of the second lens L2 is convex; the image-side surface of the seventh lens L7 is convex; the object-side surface of the eighth lens L8 is concave; and the image-side surface of the tenth lens L10 is convex.
[0020] Furthermore, the third lens L3 and the fourth lens L4 are cemented lenses.
[0021] Furthermore, an aperture stop (STOP) is provided between the fourth lens L4 and the fifth lens L5, and an image plane (IMG) is provided on the side of the tenth lens L10 near the image side.
[0022] This utility model also discloses a camera device, including an electronic photosensitive element and an optical lens as described above.
[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0024] 1) This utility model discloses an optical lens with a large zoom ratio and a camera device having the same, which can realize large field of view detection at low magnification and high resolution detection at high magnification for individual high-precision areas, and solves the defects of the prior art such as the inability to scale targets of different sizes at different ratios, the single size of the observable object, and the small range of usable working distance.
[0025] 2) The optical lens provided by this utility model can achieve high-quality imaging within a wide working distance range, meeting the requirements of high pixel count, large target area, and low distortion. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;
[0027] Figure 2 This is the Far-end MTF diagram of Embodiment 1 of this utility model;
[0028] Figure 3 This is the Near-end MTF diagram of Embodiment 1 of this utility model;
[0029] Figure 4 This is a structural schematic diagram of Embodiment 2 of the present invention;
[0030] Figure 5 This is the Far-end MTF diagram of Embodiment 2 of this utility model;
[0031] Figure 6 This is the Near-end MTF diagram of Embodiment 2 of this utility model;
[0032] Figure 7 This is a schematic diagram of the structure of Embodiment 3 of this utility model;
[0033] Figure 8 This is the Far-end MTF diagram of Embodiment 3 of this utility model;
[0034] Figure 9 This is the Near-end MTF diagram of Embodiment 3 of this utility model. Detailed Implementation
[0035] The present invention will now be described in detail so that its advantages and features can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of the present invention.
[0036] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.
[0037] like Figure 1-9 As shown, an optical lens with a large zoom ratio includes a first lens group G1 and a second lens group G2 arranged sequentially from the object side to the image side. During the zoom process, both the first lens group G1 and the second lens group G2 move along the optical axis, and focusing is achieved by changing the interval between the first lens group G1 and the second lens group G2.
[0038] In this utility model, the first lens group G1 satisfies the following condition (1):
[0039]
[0040] Where, β F β N These represent the lateral magnification of the first lens group G1 at its farthest working distance and its closest working distance, respectively.
[0041] The first lens group G1 satisfies the following condition (2):
[0042]
[0043] Where f1 and f2 represent the focal lengths of the first lens group G1 and the second lens group G2, respectively.
[0044] The first lens group G1 satisfies the following condition (3):
[0045]
[0046] Where f is the focal length of an optical lens with a large zoom ratio.
[0047] The optical lens of this utility model satisfies the following condition (4):
[0048]
[0049] Among them, TTL F TTL N These represent the total optical length of the lens at its farthest working distance and its closest working distance, respectively.
[0050] By adopting the above technical solution, the optical lens can achieve a change in the lateral magnification of the first lens group by changing the interval between the front and rear lens groups while focusing the entire lens group, thus compensating for the image plane offset and achieving zoom while meeting the requirements for high-quality imaging.
[0051] By adopting the above technical solution, the optical lens can meet the requirement of high-quality imaging at a wide working distance. Among them, condition (1) specifies the range of the ratio between the difference between the lateral magnification of the first lens group G1 and 1 at the farthest and closest working distances. By satisfying condition (1) and reasonably selecting the lateral magnification of the first lens group G1, good imaging performance can be maintained within a certain working distance. If the upper limit of condition (1) is exceeded, the lateral magnification of the first lens group G1 at the closest working distance will be too large, which will cause the back focal length of the optical lens to be too long, and the total length of the optical system will be too long, which is not the optimal solution. If the lower limit of condition (1) is exceeded, the lateral magnification of the first lens group G1 at the farthest working distance will be too large, which will cause the amount of movement during focusing to be too large, resulting in a decrease in imaging quality, which is also not the optimal solution.
[0052] By adopting the above technical solution, the optical lens can achieve a large zoom ratio while meeting the requirement of miniaturization. Condition (2) specifies the range of the ratio between the focal lengths of the second lens group G2 and the first lens group G1. If the ratio exceeds the upper limit of condition (2), the optical focal length of the first lens group G1 is too small, contributing too little to the optical power and failing to meet the requirements for large target imaging. If the ratio exceeds the lower limit of condition (2), the optical focal length of the first lens group G1 is too large, introducing spherical aberration, coma, etc., resulting in decreased imaging performance and a non-optimal solution.
[0053] By adopting the above technical solution, the optical lens can have a large zoom ratio while having a small adjustment interval, thus meeting the requirements of high-precision focusing. Among them, condition (3) specifies the range of the ratio between the square of the focal length of the entire lens group and the first lens group G1. If it exceeds the upper limit of condition (3), the focusing sensitivity of the first lens group is too high, resulting in excessive aberrations such as image plane curvature and astigmatism, which reduces imaging performance and is not the optimal solution. If it exceeds the lower limit of condition (3), the focusing sensitivity of the first lens group is too low, requiring an excessively long focusing interval, which makes it impossible to achieve high-performance imaging over a wide working distance.
[0054] By controlling the total optical length at different working distances, lens miniaturization can be achieved while realizing large zoom imaging. Condition (4) specifies the range of the ratio between the total optical length at the farthest working distance and the total optical length at the closest working distance. By satisfying condition (4), the change in the total optical length of the lens can be effectively controlled while satisfying large zoom imaging, thus meeting the requirements of high-performance imaging.
[0055] The optical lens of this invention includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a tenth lens L10 arranged sequentially from the object side to the image side. The first lens group G1 includes the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7, and the second lens group G2 includes the eighth lens L8, the ninth lens L9, and the tenth lens L10.
[0056] Example 1
[0057] like Figure 1-3 As shown, an optical lens with a large zoom ratio includes a first lens group G1 and a second lens group G2 arranged sequentially from the object side to the image side. During the zoom process, both the first lens group G1 and the second lens group G2 move along the optical axis, and focusing is achieved by changing the interval between the first lens group G1 and the second lens group G2.
[0058] The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The first lens L1 is cemented with the second lens L2, the third lens L3 is cemented with the fourth lens L4, and the fifth lens L5, the sixth lens L6, and the seventh lens L7 are cemented together. The following conditions must be met: the object-side surface of the first lens L1 is convex and the image-side surface is concave; the object-side surface of the second lens L2 is convex and the image-side surface is concave; the object-side surface of the third lens L3 is convex and the image-side surface is concave; the object-side surface of the fourth lens L4 is convex; the object-side surface of the fifth lens L5 is concave and the image-side surface is convex; the image-side surface of the sixth lens L6 is concave; and the seventh lens L7 is a biconvex lens.
[0059] The second lens group G2 includes an eighth lens L8, a ninth lens L9, and a tenth lens L10. The eighth lens L8 and the ninth lens L9 are cemented together and satisfy the following conditions: the eighth lens L8 is a biconcave lens, the ninth lens L9 is a biconvex lens, and the object side of the tenth lens L10 is concave and the image side is convex.
[0060] In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, and the tenth lens L10 are arranged in order from the object side to the image side. The stop stop is set between the fourth lens L4 and the fifth lens L5. The tenth lens L10 has a protective glass cover and an image plane IMG arranged in order on the side closer to the image side.
[0061] The parameter values of each lens in Example 1 are shown in Table 1.
[0062] Table 1
[0063] Si name radius thickness nd vd 0 D(0) 1 L1 45.930 2.9 2.0007 25.43 2 L2 75.713 8.0 1.4875 70.44 3 28.689 10.7 4 L3 62.301 8.0 1.8501 30.01 5 L4 17.772 5.1 1.7292 54.68 6 934.712 1.0 7 STOP INF 4.7 8 L5 -69.634 4.1 1.5503 75.5 9 -21.328 0.0 10 L6 -21.328 7.5 1.85451 25.15 11 L7 119.583 8.0 1.92286 20.88 12 -44.480 D(1) 13 L8 -49.600 1.0 1.74077 27.76 14 L9 76.473 8.3 1.91082 35.25 15 -42.184 31.6 16 L10 -32.025 6.7 1.60881 58.86 17 -61.612 D(2) 18 Cover INF 1.0 1.5168 64.2 19 IMG INF 0.0
[0064] In Table 1, the radius is the radius of curvature, the thickness is the on-axis distance between the i-th surface and the (i+1)-th surface, nd is the refractive index, vd is the Abbe number, INF indicates that the surface is a plane, and in the column where the surface number Si is located, 0 represents the object plane, 19 (IMG) represents the image plane IMG, and the surface numbers 1-18 are the surfaces of each lens, stop, and cover glass from the object plane to the image plane, respectively. It should be noted that the cemented surfaces of different lenses in a cemented lens group are represented as the same surface.
[0065] In Example 1, the optical parameters of the optical lens are shown in Table 2.
[0066] Table 2
[0067]
[0068] In Table 2, RED is the magnification, Far is the farthest working distance, Near is the closest working distance, D(0) is the working distance, i.e., the on-axis distance between the object surface and the vertex of the side surface of the first lens L1, D(1) is the on-axis distance between the vertices of adjacent surfaces of the first lens group G1 and the second lens group G2, and D(2) is the on-axis distance between the vertices of adjacent surfaces of the second lens group G2 and the protective glass Cover.
[0069] Figure 2 This is the Far-end MTF diagram of Example 1. Figure 3 This is the Near-end MTF diagram for Example 1. (From...) Figure 2-3 It can be seen that the optical lens of this embodiment can achieve high-quality imaging over a wide working distance range, meeting the requirements of high pixel count, large target area, and low distortion.
[0070] Example 2
[0071] like Figure 4-6 As shown, an optical lens with a large zoom ratio includes a first lens group G1 and a second lens group G2 arranged sequentially from the object side to the image side. During the zoom process, both the first lens group G1 and the second lens group G2 move along the optical axis, and focusing is achieved by changing the interval between the first lens group G1 and the second lens group G2.
[0072] The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The third lens L3 is cemented with the fourth lens L4, and the sixth lens L6 is cemented with the seventh lens L7. The following conditions must be met: the object-side surface of the first lens L1 is convex and the image-side surface is concave; the object-side surface of the second lens L2 is convex and the image-side surface is concave; the object-side surface of the third lens L3 is convex; the fifth lens L5 is a biconvex lens; the sixth lens L6 is a biconcave lens; and the seventh lens L7 is a biconvex lens.
[0073] The second lens group G2 includes an eighth lens L8, a ninth lens L9, and a tenth lens L10. The object side of the eighth lens L8 is concave, and the image side is convex. The ninth lens L9 is a biconcave lens, and the image side of the tenth lens L10 is convex.
[0074] In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, and the tenth lens L10 are arranged in order from the object side to the image side. The stop stop is set between the fourth lens L4 and the fifth lens L5. The tenth lens L10 has a protective glass cover and an image plane IMG arranged in order on the side closer to the image side.
[0075] The parameter values of each lens in Example 2 are shown in Table 3.
[0076] Table 3
[0077] Si name radius thickness nd vd 0 (D0) 1 L1 46.02 3.7 1.9354 20.96 2 81.77 0.2 3 L2 33.25 3.9 1.5850 38.41 4 21.18 1.8 5 L3 27.93 8.0 1.7476 52.28 6 L4 -192.33 5.6 1.8030 24.92 7 20.12 11.2 8 STOP INF 3.1 9 L5 106.12 2.9 1.94576 17.99 10 -82.01 0.6 11 L6 -52.30 1.9 1.8 30.75 12 L7 32.73 6.0 1.67313 58.08 13 -48.91 D(1) 14 L8 -41.68 3.3 1.8543 37.47 15 -25.84 0.2 16 L9 -40.46 8.0 1.61441 33.6 17 104.91 1.1 18 L10 3339.75 4.3 1.75834 51.68 19 -63.90 D(2) 20 Cover INF 1 1.52 64.2 21 IMG INF 0
[0078] In Table 3, the radius is the radius of curvature, the thickness is the on-axis distance between the i-th surface and the (i+1)-th surface, nd is the refractive index, vd is the Abbe number, INF indicates that the surface is a plane, and in the column where the surface number Si is located, 0 represents the object plane, 21 (IMG) represents the image plane IMG, and the surface numbers 1-20 are the surfaces of each lens, stop, and cover glass from the object plane to the image plane, respectively. It should be noted that the cemented surfaces of different lenses in a cemented lens group are represented as the same surface.
[0079] In Example 2, the optical parameters of the optical lens are shown in Table 4.
[0080] Table 4
[0081]
[0082]
[0083] In Table 4, RED is the magnification, Far is the farthest working distance, Near is the closest working distance, D(0) is the working distance, i.e., the on-axis distance between the object surface and the vertex of the side surface of the first lens L1, D(1) is the on-axis distance between the vertex of the adjacent surfaces of the first lens group G1 and the second lens group G2, and D(2) is the on-axis distance between the vertex of the adjacent surfaces of the second lens group G2 and the protective glass Cover.
[0084] Figure 5 This is the Far-end MTF diagram of Example 2. Figure 6 This is the Near-end MTF diagram for Example 2. Figure 5-6 It can be seen that the optical lens of this embodiment can achieve high-quality imaging over a wide working distance range, meeting the requirements of high pixel count, large target area, and low distortion.
[0085] The rest is the same as in Example 1.
[0086] Example 3
[0087] like Figure 7-9 As shown, an optical lens with a large zoom ratio includes a first lens group G1 and a second lens group G2 arranged sequentially from the object side to the image side. During the zoom process, both the first lens group G1 and the second lens group G2 move along the optical axis, and focusing is achieved by changing the interval between the first lens group G1 and the second lens group G2.
[0088] The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The third lens L3 is cemented with the fourth lens L4, and the fifth lens L5 is cemented with the sixth lens L6. The following conditions must be met: the object-side surface of the first lens L1 is convex and the image-side surface is concave; the object-side surface of the second lens L2 is convex and the image-side surface is concave; the third lens L3 is a biconcave lens; the fourth lens L4 is a biconvex lens; the object-side surface of the fifth lens L5 is concave and the image-side surface is convex; the object-side surface of the sixth lens L6 is concave and the image-side surface is convex; and the image-side surface of the seventh lens L7 is convex.
[0089] The second lens group G2 includes an eighth lens L8, a ninth lens L9, and a tenth lens L10. The eighth lens L8 and the ninth lens L9 are cemented together. The eighth lens L8 is a biconcave lens, the ninth lens L9 is a biconvex lens, and the object side of the tenth lens L10 is concave and the image side is convex.
[0090] In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, and the tenth lens L10 are arranged in order from the object side to the image side. The stop stop is set between the fourth lens L4 and the fifth lens L5. The tenth lens L10 has a protective glass cover and an image plane IMG arranged in order on the side closer to the image side.
[0091] The parameter values of each lens in Example 3 are shown in Table 5.
[0092] Table 5
[0093]
[0094]
[0095] In Table 5, the radius is the radius of curvature, the thickness is the on-axis distance between the i-th surface and the (i+1)-th surface, nd is the refractive index, vd is the Abbe number, INF indicates that the surface is a plane, and in the column where the surface number Si is located, 0 represents the object plane, 20 (IMG) represents the image plane IMG, and the surface numbers 1-19 are the surfaces of each lens, stop, and cover glass from the object plane to the image plane, respectively. It should be noted that the cemented surfaces of different lenses in a cemented lens group are represented as the same surface.
[0096] In Example 3, the optical parameters of the optical lens are shown in Table 6.
[0097] Table 6
[0098]
[0099] In Table 6, RED is the magnification, Far is the farthest working distance, Near is the closest working distance, D(0) is the working distance, i.e., the on-axis distance between the object surface and the vertex of the side surface of the first lens L1, D(1) is the on-axis distance between the vertices of adjacent surfaces of the first lens group G1 and the second lens group G2, and D(2) is the on-axis distance between the vertices of adjacent surfaces of the second lens group G2 and the protective glass Cover.
[0100] Figure 8 This is the Far-end MTF diagram of Example 2. Figure 9 This is the Near-end MTF diagram for Example 2. Figure 8-9 It can be seen that the optical lens of this embodiment can achieve high-quality imaging over a wide working distance range, meeting the requirements of high pixel count, large target area, and low distortion.
[0101] Examples 1-3 satisfy the following conditions, as shown in Table 7:
[0102] Table 7
[0103]
[0104] The rest is the same as in Example 1.
[0105] The parts or structures not specifically described in this utility model can be made using existing technology or existing products, and will not be elaborated here.
[0106] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. An optical lens with a large zoom ratio, characterized in that, It includes a first lens group G1 and a second lens group G2 arranged sequentially from the object side to the image side. During the zoom process, both the first lens group G1 and the second lens group G2 move along the optical axis, and focusing is achieved by changing the interval between the first lens group G1 and the second lens group G2. The first lens group G1 satisfies the following condition (1): -0.2≥ ≥-0.4（1） in, β F , β N These represent the lateral magnifications of the first lens group G1 at its farthest working distance and closest working distance, respectively. The first lens group G1 satisfies the following condition (2): 0.7≤ ≤2.0（2） in, f 1. f 2 represents the focal length of the first lens group G1 and the second lens group G2, respectively; The first lens group G1 satisfies the following condition (3): 0.4≤ ≤0.75（3） in, f The focal length of an optical lens with a large zoom ratio; The optical lens satisfies the following condition (4): 0.4≥ ≥0.3（4） in, TTL F , TTL N These represent the total optical length of the lens at its farthest working distance and its closest working distance, respectively.
2. The optical lens with a large zoom ratio according to claim 1, characterized in that, The optical lens with a large zoom ratio includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a tenth lens L10 arranged sequentially from the object side to the image side. The first lens group G1 includes the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7. The second lens group G2 includes the eighth lens L8, the ninth lens L9, and the tenth lens L10.
3. An optical lens with a large zoom ratio according to claim 2, characterized in that, The object-side surface of the first lens L1 is convex, and the image-side surface is concave; the object-side surface of the second lens L2 is convex; the image-side surface of the seventh lens L7 is convex; the object-side surface of the eighth lens L8 is concave; and the image-side surface of the tenth lens L10 is convex.
4. An optical lens with a large zoom ratio according to claim 2, characterized in that, The third lens L3 and the fourth lens L4 are cemented lenses.
5. An optical lens with a large zoom ratio according to claim 2, characterized in that, An aperture stop (STOP) is provided between the fourth lens L4 and the fifth lens L5, and an image plane (IMG) is provided on the side of the tenth lens L10 near the image side.
6. A camera device, characterized in that, Includes electronic photosensitive elements and optical lenses with a large zoom ratio as described in any one of claims 1-5.