Optical lens with large zoom ratio and camera device with same
By designing an optical lens with a large zoom ratio, focusing and scaling are achieved using the movement of the lens group, the problem of being unable to scale different size targets in the prior art is solved, and high-quality imaging and multi-function detection are achieved.
Patent Information
- Application Number
- CN202411876909.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-02-11
Smart Images
Figure CN119414582A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of optical lenses, and in particular relates to an optical lens with a large zoom ratio and a camera device having the same. Background Art
[0002] At present, the visual lenses that appear in the domestic and foreign markets have only a single focal length and cannot scale objects of different sizes at different ratios, resulting in defects such as a single size of observable objects and a small range of available working distances. Therefore, it is urgent to develop optical lenses with variable magnification functions and achieve scaling of different targets. Summary of the invention
[0003] In order to solve the technical problems existing in the prior art, the object of the present invention is to provide an optical lens with a large zoom ratio and a camera device having the same.
[0004] In order to achieve the above purpose and the above technical effect, the technical solution adopted by the present invention is:
[0005] An optical lens with a large zoom ratio comprises a first lens group G1 and a second lens group G2 arranged in sequence from the object side to the image side. During the zoom process, the first lens group G1 and the second lens group G2 both move along the optical axis, and focusing is achieved by changing the spacing distance between the first lens group G1 and the second lens group G2.
[0006] Furthermore, the first lens group G1 satisfies the following conditional formula (1):
[0007]
[0008] Among them, β F , β N They respectively represent the lateral magnification of the first lens group G1 at the farthest working distance and the closest working distance.
[0009] Furthermore, the first lens group G1 satisfies the following conditional formula (2):
[0010]
[0011] Wherein, 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 conditional formula (3):
[0013]
[0014] Wherein, f is the focal length of the 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 Respectively represent the total optical length of the optical lens at the farthest working distance and the closest working distance.
[0018] Further, the optical lens 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, which are arranged in sequence from the object side to the image side; 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; and the second lens group G2 includes an eighth lens L8, a ninth lens L9, and a 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 a cemented lens.
[0021] Furthermore, a stop STOP is disposed between the fourth lens L4 and the fifth lens L5, and an image plane IMG is disposed on the side of the tenth lens L10 close to the image side.
[0022] The invention also discloses a camera device, comprising an electronic photosensitive element and the optical lens as described above.
[0023] Compared with the prior art, the present invention has the following beneficial effects:
[0024] 1) The present invention 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, thereby solving the defects of the prior art such as the inability to scale objects of different sizes at different ratios, the single size of observable objects, and the small range of available working distances;
[0025] 2) The optical lens provided by the present invention can achieve high-quality imaging within a wide working distance range, meeting the requirements of high pixels, large target area, and low distortion. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1It is a structural schematic diagram of embodiment 1 of the present invention;
[0027] Figure 2 This is the Far end MTF diagram of Example 1 of the present invention;
[0028] Figure 3 This is the Near-end MTF diagram of Example 1 of the present invention;
[0029] Figure 4 It is a structural schematic diagram of embodiment 2 of the present invention;
[0030] Figure 5 This is the Far end MTF diagram of Example 2 of the present invention;
[0031] Figure 6 This is the Near-end MTF diagram of Example 2 of the present invention;
[0032] Figure 7 This is a schematic diagram of the structure of Embodiment 3 of the present invention;
[0033] Figure 8 This is the Far end MTF diagram of Example 3 of the present invention;
[0034] Fig. 9 This is the Near-end MTF diagram of Example 3 of the present invention. DETAILED DESCRIPTION
[0035] The present invention is described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.
[0036] A brief summary of one or more aspects is given below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or critical elements of all aspects nor to define the scope of any or all aspects. Its only purpose is to give some concepts of one or more aspects in a simplified form as a prelude to a more detailed description that will be given later.
[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 in sequence from the object side to the image side. During the zoom process, the first lens group G1 and the second lens group G2 both 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.
[0038] In the present invention, the first lens group G1 satisfies the following conditional formula (1):
[0039]
[0040] Among them, β F , β N They respectively represent the lateral magnification of the first lens group G1 at the farthest working distance and the closest working distance.
[0041] The first lens group G1 satisfies the following conditional formula (2):
[0042]
[0043] Wherein, 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 conditional formula (3):
[0045]
[0046] Wherein, f is the focal length of the optical lens with a large zoom ratio.
[0047] The optical lens of the present invention satisfies the following conditional formula (4):
[0048]
[0049] Among them, TTL F 、TTL N Respectively represent the total optical length of the optical lens at the farthest working distance and the closest working distance.
[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 group, compensate for the offset of the image plane, and achieve magnification while meeting the needs of high-quality imaging.
[0051] By adopting the above technical solution, the optical lens can meet the demand for high-quality imaging at a wide working distance. Among them, conditional formula (1) stipulates the ratio range between the difference between the lateral magnification of the first lens group G1 and 1 at the farthest and closest working distances. By satisfying conditional formula (1), the lateral magnification of the first lens group G1 is reasonably selected to maintain good imaging performance within a certain working distance. If the upper limit of conditional formula (1) is exceeded, the lateral magnification of the first lens group G1 at the closest working distance is too large, which will cause the back focus of the optical lens to be too long, and the total length of the optical system is too long, which is not the optimal solution. If the lower limit of conditional formula (1) is exceeded, the lateral magnification of the first lens group G1 at the farthest working distance is too large, which will cause the movement amount during the focusing process 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 have a large zoom ratio while meeting the requirements of miniaturization. Among them, conditional formula (2) stipulates the ratio range between the focal lengths of the second lens group G2 and the first lens group G1. If the upper limit of conditional formula (2) is exceeded, the focal length of the first lens group G1 is too small, and the contribution to the focal length is too small, which cannot meet the requirements of large target surface imaging. If the lower limit of conditional formula (2) is exceeded, the focal length of the first lens group G1 is too large, which will introduce spherical aberration, coma, etc., and the imaging performance will be reduced, which is not the optimal solution.
[0053] By adopting the above technical solution, the optical lens can have a large zoom ratio and a small adjustment interval at the same time, meeting the needs of high-precision focusing. Among them, conditional formula (3) stipulates the ratio range between the square of the focal length of the entire lens group and the first lens group G1. If the upper limit of conditional formula (3) is exceeded, the focusing sensitivity of the first lens group is too high, resulting in excessive aberrations such as image curvature and astigmatism, and the imaging performance is reduced, which is not the optimal solution. If the lower limit of conditional formula (3) is exceeded, the focusing sensitivity of the first lens group is too small, and the focusing interval required is too long, and high-performance imaging cannot be achieved at a wide working distance.
[0054] By controlling the total optical length at different working distances, the miniaturization of the lens can be achieved while achieving large zoom imaging. Conditional formula (4) specifies the ratio range between the total optical length at the farthest working distance and the total optical length at the closest working distance. By satisfying conditional formula (4), the change in the total optical length of the optical lens can be effectively controlled while satisfying large zoom imaging, meeting the needs of high-performance imaging.
[0055] The optical lens of the present 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, which are arranged in sequence 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 in sequence from the object side to the image side. During the zoom process, the first lens group G1 and the second lens group G2 both 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.
[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, wherein the first lens L1 is cemented with the second lens L2, the third lens L3 is cemented with the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are cemented together, and satisfy the following conditions: 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 double convex lens.
[0059] The second lens group G2 includes an eighth lens L8, a ninth lens L9 and a tenth lens L10, wherein the eighth lens L8 and the ninth lens L9 are cemented together and satisfy: the eighth lens L8 is a biconcave lens, the ninth lens L9 is a biconvex lens, and the object-side surface of the tenth lens L10 is a concave surface, and the image-side surface is a convex surface.
[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 sequence from the object side to the image side, the aperture stop STOP is provided between the fourth lens L4 and the fifth lens L5, and a protective glass Cover and an image plane IMG are sequentially provided on the side of the tenth lens L10 close 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, radius is the radius of curvature, thickness is the on-axis surface 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 indicates the object plane, 19, i.e., IMG, indicates the image plane IMG, and surface numbers 1-18 are the surfaces of each lens from the object plane to the image plane, the aperture STOP, and the protective glass Cover, respectively. It should be noted that the cemented surfaces of different lenses in the 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 axial distance between the object plane and the vertex of the side surface of the object plane of the first lens L1, D(1) is the axial distance between the vertices of the adjacent surfaces of the first lens group G1 and the second lens group G2, and D(2) is the axial distance between the vertices of the adjacent surfaces of the second lens group G2 and the protective glass Cover.
[0069] Figure 2 is the Far end MTF diagram of Example 1, Figure 3 is the Near-end MTF diagram of Example 1. Figure 2-3 It can be seen that the optical lens of this embodiment can achieve high-quality imaging within a wide working distance range, meeting the requirements of high pixels, 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 in sequence from the object side to the image side. During the zoom process, the first lens group G1 and the second lens group G2 both 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.
[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, wherein the third lens L3 is cemented with the fourth lens L4, the sixth lens L6 is cemented with the seventh lens L7, and the following conditions are satisfied: 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, wherein the object-side surface of the eighth lens L8 is concave and the image-side surface is convex, the ninth lens L9 is a biconcave lens, and the image-side surface 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 sequence from the object side to the image side, the aperture stop STOP is provided between the fourth lens L4 and the fifth lens L5, and a protective glass Cover and an image plane IMG are sequentially provided on the side of the tenth lens L10 close 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, radius is the radius of curvature, thickness is the on-axis surface 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 indicates the object plane, 21, i.e., IMG, indicates the image plane IMG, and surface numbers 1-20 are the surfaces of each lens from the object plane to the image plane, the aperture STOP, and the protective glass Cover, respectively. It should be noted that the cemented surfaces of different lenses in the 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 axial distance between the object plane and the vertex of the side surface of the object plane of the first lens L1, D(1) is the axial distance between the vertices of the adjacent surfaces of the first lens group G1 and the second lens group G2, and D(2) is the axial distance between the vertices of the adjacent surfaces of the second lens group G2 and the protective glass Cover.
[0084] Figure 5 is the Far end MTF diagram of Example 2, Figure 6 is the Near-end MTF diagram of Example 2. Figure 5-6 It can be seen that the optical lens of this embodiment can achieve high-quality imaging within a wide working distance range, meeting the requirements of high pixels, 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 in sequence from the object side to the image side. During the zoom process, the first lens group G1 and the second lens group G2 both 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.
[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, wherein the third lens L3 is cemented with the fourth lens L4, and the fifth lens L5 is cemented with the sixth lens L6, and the following conditions are satisfied: 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, wherein 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 surface of the tenth lens L10 is a concave surface, and the image-side surface is a convex surface.
[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 sequence from the object side to the image side, the aperture stop STOP is provided between the fourth lens L4 and the fifth lens L5, and a protective glass Cover and an image plane IMG are sequentially provided on the side of the tenth lens L10 close 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, radius is the radius of curvature, thickness is the on-axis surface 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 indicates the object plane, 20, i.e., IMG, indicates the image plane IMG, and surface numbers 1-19 are the surfaces of each lens from the object plane to the image plane, the aperture STOP, and the protective glass Cover, respectively. It should be noted that the cemented surfaces of different lenses in the 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 axial distance between the object plane and the vertex of the side surface of the object plane of the first lens L1, D(1) is the axial distance between the vertices of the adjacent surfaces of the first lens group G1 and the second lens group G2, and D(2) is the axial distance between the vertices of the adjacent surfaces of the second lens group G2 and the protective glass Cover.
[0100] Figure 8 is the Far end MTF diagram of Example 2, Fig. 9 is the Near-end MTF diagram of Example 2. Figure 8-9 It can be seen that the optical lens of this embodiment can achieve high-quality imaging within a wide working distance range, meeting the requirements of high pixels, large target area, and low distortion.
[0101] Examples 1-3 meet the following conditions, as shown in Table 7:
[0102] Table 7
[0103]
[0104] The rest is the same as in Example 1.
[0105] Parts or structures not specifically described in the present invention may adopt existing technologies or existing products and will not be described in detail here.
[0106] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
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 in sequence from the object side to the image side. During the zooming process, the first lens group G1 and the second lens group G2 both 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.
2. The optical lens with a large zoom ratio according to claim 1, characterized in that: The first lens group G1 satisfies the following conditional formula (1): Among them, β F , β N They respectively represent the lateral magnification of the first lens group G1 at the farthest working distance and the closest working distance.
3. The optical lens with a large zoom ratio according to claim 1, characterized in that: The first lens group G1 satisfies the following conditional formula (2): Wherein, f1 and f2 represent the focal lengths of the first lens group G1 and the second lens group G2 respectively.
4. The optical lens with a large zoom ratio according to claim 1, characterized in that: The first lens group G1 satisfies the following conditional formula (3): Wherein, f is the focal length of the optical lens with a large zoom ratio.
5. The optical lens with a large zoom ratio according to claim 1, characterized in that: The optical lens satisfies the following condition (4): Among them, TTL F 、TTL N Respectively represent the total optical length of the optical lens at the farthest working distance and the closest working distance.
6. The optical lens with a large zoom ratio according to claim 1, characterized in that: The optical lens 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, which are arranged in sequence from the object side to the image side. 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 second lens group G2 includes an eighth lens L8, a ninth lens L9, and a tenth lens L10.
7. The optical lens with a large zoom ratio according to claim 6, 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.
8. The optical lens with a large zoom ratio according to claim 6, characterized in that: The third lens L3 and the fourth lens L4 are a cemented lens.
9. The optical lens with a large zoom ratio according to claim 6, characterized in that: A stop STOP is disposed between the fourth lens L4 and the fifth lens L5 , and an image plane IMG is disposed on a side of the tenth lens L10 close to the image side.
10. A camera device, characterized in that: It comprises an electronic photosensitive element and an optical lens as described in any one of claims 1-9.