Zoom lens
By optimizing the lens group movement and optical power of the zoom lens, the problem of achieving confocal focus of visible and infrared light and large aperture zoom across the entire focal length range in existing technologies has been solved, achieving efficient zoom and confocal performance while maintaining a maximum aperture of 1.05 during zoom.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SUNNY OPTICS(ZHONGSHAN) CO LTD
- Filing Date
- 2022-10-20
- Publication Date
- 2026-07-21
AI Technical Summary
Existing zoom lenses struggle to achieve cofocal focus of visible and infrared light across the entire focal length while maintaining high resolution, and to achieve large-aperture zoom during zooming.
Design a zoom lens that, along the optical axis from the object side to the image side, includes a compensating lens group with negative optical power, a fixed lens group with positive optical power, an aperture stop, a zoom lens group with positive optical power, and a second fixed lens group with positive optical power. By rationally allocating the movement mode and optical power of the lens group, and optimizing the number and shape of the lenses, an approximately 2.5x zoom ratio and confocal visible and infrared light across the entire focal length range are achieved, while a maximum aperture of f/1.05 is achieved during zooming.
It achieves fast focusing response across the entire focal length range, a zoom ratio of approximately 2.5x, and supports co-focusing of visible and infrared light. It also achieves a maximum aperture of f/1.05 during zooming while maintaining a compact design.
Smart Images
Figure CN115542523B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of imaging lens technology, and more particularly to a zoom lens. Background Technology
[0002] Zoom lenses, with their variable focal length, can meet the needs of diverse monitoring scenarios, thus gaining widespread attention and application in the security monitoring and intelligent transportation markets. With increased attention, the market has also placed higher demands on the image acquisition capabilities of zoom lenses. Specifically, zoom lenses with powerful image acquisition functions need to ensure large-aperture zoom across the entire focal length range while maintaining high resolution, and simultaneously ensuring confocal focusing of visible and infrared light across the entire focal length range. Zoom lenses that combine these characteristics will have great application prospects. However, existing zoom lenses generally cannot yet simultaneously meet these requirements. Summary of the Invention
[0003] To address the problems existing in the prior art, the present invention aims to provide a zoom lens that can achieve a zoom ratio of approximately 2.5x, while simultaneously achieving co-focusing of visible and infrared light across the entire focal length range, and achieving a maximum aperture of f / 1.05 during zooming.
[0004] To achieve the above-mentioned objective, the present invention provides a zoom lens, which, along the optical axis from the object side to the image side, sequentially includes: a compensating lens group with negative optical power, a first fixed lens group with positive optical power, an aperture stop, a zoom lens group with positive optical power, a second fixed lens group with positive optical power, a parallel plate, and an image plane, wherein the compensating lens group and the zoom lens group are movable along the optical axis.
[0005] According to one aspect of the invention, along the optical axis from the object side to the image side, the compensation lens group sequentially comprises: a first lens, a second lens, a third lens, and a fourth lens.
[0006] The first lens and the fourth lens have negative optical power.
[0007] According to one aspect of the invention, along the optical axis from the object side to the image side,
[0008] The first lens is a convex-concave lens;
[0009] The second lens is a concave-convex lens, a concave-concave lens, or a convex-convex lens;
[0010] The third lens is a concave-concave lens or a convex-concave lens;
[0011] The object-side surface of the fourth lens is concave.
[0012] According to one aspect of the invention, the first fixed lens group includes a fifth lens with positive optical power.
[0013] According to one aspect of the invention, the object-side surface of the fifth lens is convex.
[0014] According to one aspect of the invention, along the optical axis from the object side to the image side, the zoom lens group sequentially comprises: a sixth lens, a seventh lens, an eighth lens, and a ninth lens.
[0015] The sixth lens and the ninth lens have positive optical power.
[0016] According to one aspect of the invention, along the optical axis from the object side to the image side,
[0017] The sixth lens is a convex-convex lens;
[0018] The seventh lens is a convex-convex lens, a concave-convex lens, or a concave-concave lens;
[0019] The eighth lens is a concave-concave lens, a convex-concave lens, or a convex-convex lens;
[0020] The ninth lens is either a convex-convex lens or a concave-convex lens.
[0021] According to one aspect of the invention, the focal length f6 of the sixth lens and the focal length F3 of the zoom lens group satisfy the following condition: 1.16≤f6 / F3≤1.90.
[0022] According to one aspect of the invention, the focal length f9 of the ninth lens and the focal length F3 of the zoom lens group satisfy the following condition: 0.99≤f9 / F3≤4.48.
[0023] According to one aspect of the invention, the zoom lens group further includes a fifteenth lens, the fifteenth lens being located between the first fixed lens group and the sixth lens.
[0024] According to one aspect of the invention, the fifteenth lens is a convex-concave lens or a convex-convex lens in the direction from the object side to the image side along the optical axis.
[0025] According to one aspect of the invention, along the optical axis from the object side to the image side, the second fixed lens group sequentially comprises: a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens, and a fourteenth lens.
[0026] The tenth, twelfth, and fourteenth lenses have negative optical power, while the eleventh and thirteenth lenses have positive optical power.
[0027] According to one aspect of the invention, along the optical axis from the object side to the image side,
[0028] The tenth lens and the twelfth lens are concave-concave lenses;
[0029] The eleventh lens and the thirteenth lens are convex-convex lenses;
[0030] The fourteenth lens is a concave-concave lens, a convex-concave lens, or a concave-convex lens.
[0031] According to one aspect of the invention, the second fixed lens group further includes a sixteenth lens with positive optical power, the sixteenth lens being located between the fourteenth lens and the parallel plate.
[0032] According to one aspect of the invention, the sixteenth lens is a convex-concave lens or a convex-convex lens in the direction from the object side to the image side along the optical axis.
[0033] According to one aspect of the invention, the zoom lens group comprises at least one cemented lens.
[0034] According to one aspect of the invention, the zoom lens comprises at least two aspherical lenses, including at least one glass aspherical lens.
[0035] According to one aspect of the invention, the moving distance T1 of the compensation lens group and the moving distance T2 of the zoom lens group satisfy the following condition: 0.54≤T1 / T2≤1.62.
[0036] According to one aspect of the invention, the focal length F1 of the compensation lens group and the focal length F3 of the zoom lens group satisfy the following condition: -0.71≤F1 / F3≤-0.55.
[0037] According to the present invention, a zoom optical system is composed of four lens groups with optical power compensation in the order of negative, positive, positive, and positive, a first fixed, a zoom, and a second fixed, and an aperture located between the first fixed lens group and the zoom lens group. The specific operation mode between the lens groups and the optimized setting and combination of the number of lenses, optical power, and shape in each lens group not only make the lens have a fast focusing response speed during zooming, but also enable the zoom lens to achieve a zoom ratio of approximately 2.5 times, while satisfying the confocal performance of visible light and infrared light across the entire focal length range, and achieving a maximum aperture of f / 1.05 during zooming, while also taking into account miniaturization design. Attached Figure Description
[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative effort.
[0039] Figure 1 This is a schematic diagram illustrating the optical system at the wide-angle end of a zoom lens according to Embodiment 1 of the present invention.
[0040] Figure 2 This is a schematic diagram illustrating the optical system at the wide-angle end of the zoom lens according to Embodiment 2 of the present invention.
[0041] Figure 3 This is a schematic diagram of the optical system at the wide-angle end of the zoom lens according to Embodiment 3 of the present invention;
[0042] Figure 4 A schematic diagram illustrating the optical system at the wide-angle end of the zoom lens according to Embodiment 4 of the present invention;
[0043] Figure 5 This is a schematic diagram illustrating the optical system at the wide-angle end of the zoom lens according to Embodiment 5 of the present invention.
[0044] Figure 6 This is a schematic diagram of the optical system at the wide-angle end of the zoom lens according to Embodiment Six of the present invention;
[0045] Figure 7 This diagram schematically illustrates the optical system at the wide-angle end of the zoom lens according to Embodiment 7 of the present invention. Detailed Implementation
[0046] The description of the embodiments in this specification should be taken in conjunction with the accompanying drawings, which should form part of the complete specification. In the drawings, the shape or thickness of the embodiments may be exaggerated and may be indicated in a simplified or convenient manner. Furthermore, parts of the various structures in the drawings will be described separately; it is worth noting that elements not shown in the figures or not described in words are in a form known to those skilled in the art.
[0047] The description of the embodiments herein, including any references to directions and orientations, is for ease of description only and should not be construed as limiting the scope of the invention. The following description of preferred embodiments involves combinations of features, which may exist independently or in combination; the invention is not particularly limited to the preferred embodiments. The scope of the invention is defined by the claims.
[0048] like Figure 1As shown, this embodiment of the invention provides a zoom lens, which, along the optical axis from the object side to the image side, sequentially includes: a compensation lens group G1, a first fixed lens group G2, an aperture stop STO, a zoom lens group G3, a second fixed lens group G4, a parallel plate CG, and an image plane IMA. The compensation lens group G1 and the zoom lens group G3 are movable along the optical axis. The compensation lens group G1 is a lens group with negative optical power, while the first fixed lens group G2, the zoom lens group G3, and the second fixed lens group G4 are all lens groups with positive optical power. Thus, by rationally allocating the operating modes and optical powers of the above four lens groups, the zoom lens can achieve a zoom ratio of approximately 2.5x, while simultaneously achieving confocal focusing of visible and infrared light across the entire focal length range, and achieving a maximum aperture of f / 1.05 during zooming.
[0049] In this embodiment of the invention, along the optical axis from the object side to the image side, the compensation lens group G1 sequentially includes: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The first lens L1 and the fourth lens L4 are both lenses with negative optical power. Regarding the lens shape, along the optical axis from the object side to the image side, the first lens L1 is a convex-concave lens, the second lens L2 is a concave-convex lens, a concave-concave lens, or a convex-convex lens, the third lens L3 is a concave-concave lens or a convex-concave lens, and the object side of the fourth lens L4 is concave, i.e., the fourth lens L4 is a concave-concave lens, a concave-flat lens, or a concave-convex lens.
[0050] In this embodiment of the invention, the first fixed lens group G2 includes a fifth lens L5. The fifth lens L5 is a lens with positive optical power. Regarding the lens shape, the object side of the fifth lens L5 is convex, that is, along the optical axis from the object side to the image side, the fifth lens L5 is a convex-concave lens, a convex-convex lens, or a convex-flat lens.
[0051] In this embodiment of the invention, along the optical axis from the object side to the image side, the zoom lens group G3 sequentially includes: a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9. The sixth lens L6 and the ninth lens L9 are both lenses with positive optical power. Regarding lens shape, along the optical axis from the object side to the image side, the sixth lens L6 is a convex-convex lens, the seventh lens L7 is a convex-convex lens, a concave-convex lens, or a concave-concave lens, the eighth lens L8 is a concave-concave lens, a convex-concave lens, or a convex-convex lens, and the ninth lens L9 is a convex-convex lens or a concave-convex lens.
[0052] In this embodiment of the invention, the zoom lens group G3 further includes a fifteenth lens L15, such as... Figure 1 , Figure 4 , Figure 6 or Figure 7As shown. The fifteenth lens L15 is located between the first fixed lens group G2 and the sixth lens L6. Regarding the lens shape, along the optical axis from the object side to the image side, the fifteenth lens L15 is a convex-concave lens or a convex-convex lens.
[0053] In this embodiment of the invention, along the optical axis from the object side to the image side, the second fixed lens group G4 sequentially includes: a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, and a fourteenth lens L14. Specifically, the tenth lens L10, the twelfth lens L12, and the fourteenth lens L14 are all lenses with negative optical power, while the eleventh lens L11 and the thirteenth lens L13 are both lenses with positive optical power. Regarding lens shape, along the optical axis from the object side to the image side, the tenth lens L10 and the twelfth lens L12 are both concave-concave lenses, the eleventh lens L11 and the thirteenth lens L13 are both convex-convex lenses, and the fourteenth lens L14 is a concave-concave lens, a convex-concave lens, or a concave-convex lens.
[0054] In this embodiment of the invention, the second fixed lens group G4 further includes a sixteenth lens L16, such as... Figures 1 to 5 or Figure 7 As shown. The sixteenth lens L16 is a lens with positive optical power and is located between the fourteenth lens L14 and the parallel plate CG. Regarding the lens shape, along the optical axis from the object side to the image side, the sixteenth lens L16 is a convex-concave lens or a convex-convex lens.
[0055] According to the above technical solution of the present invention, by reasonably allocating and optimizing the number of lenses in the four lens groups and the combination of lenses with different optical powers and different shapes, it is further beneficial for the zoom lens to achieve a zoom ratio of about 2.5 times, while satisfying the requirement of co-focusing of visible light and infrared light throughout the entire focal length range, and satisfying the requirement of achieving a maximum aperture of 1.05 during zooming.
[0056] In this embodiment of the invention, the focal length f6 of the sixth lens L6 and the focal length F3 of the zoom lens group G3 satisfy the following condition: 1.16 ≤ f6 / F3 ≤ 1.90. The focal length f9 of the ninth lens L9 and the focal length F3 of the zoom lens group G3 satisfy the following condition: 0.99 ≤ f9 / F3 ≤ 4.48. Thus, by rationally allocating the optical power and shape of each lens in the zoom lens group G3, as well as the focal lengths of the sixth lens L6 and the ninth lens L9 with positive optical power, it is beneficial for the zoom lens to achieve confocal focusing of visible light and infrared light across the entire focal length range.
[0057] In this embodiment of the invention, the zoom lens group G3 includes at least one cemented lens. The appropriate number of cemented lenses in this zoom optical system is beneficial for correcting system aberrations and improving the optical performance of the zoom lens. It also effectively corrects system chromatic aberration, facilitating confocal focusing of visible and infrared light in the zoom lens. Furthermore, it reduces assembly tolerances between lenses, improving the assembly yield of the zoom lens.
[0058] In this embodiment of the invention, the zoom lens includes at least two aspherical lenses, of which at least one is a glass aspherical lens. This is beneficial for improving the optical imaging performance of the zoom lens.
[0059] In this embodiment of the invention, the moving distance T1 of the compensation lens group G1 and the moving distance T2 of the zoom lens group G3 satisfy the following condition: 0.54≤T1 / T2≤1.62. Limiting the relationship between the moving distances of the compensation lens group G1 and the zoom lens group G3 ensures a fast focusing response during zooming, while also achieving miniaturization of the zoom lens.
[0060] In this embodiment of the invention, the focal length F1 of the compensation lens group G1 and the focal length F3 of the zoom lens group G3 satisfy the following condition: -0.71≤F1 / F3≤-0.55. This reasonable allocation of the optical power and focal length range between the compensation and zoom lens groups is beneficial for improving the stability of the optical performance of the zoom lens during zooming and focusing, and also helps to improve the optical performance of the zoom lens, thus broadening its application prospects.
[0061] In summary, the zoom lens of this invention exhibits fast focusing response speed during zooming or magnification across the entire focal length range, achieving a zoom ratio of approximately 2.5x. It also satisfies confocal performance for visible and infrared light across the entire focal length range and achieves a maximum aperture of f / 1.05 during zooming. This zoom lens also incorporates a miniaturized design.
[0062] The zoom lens of the present invention will be specifically described below with reference to seven embodiments, in conjunction with the accompanying drawings and tables. In the following embodiments, the aperture stop STO is referred to as one side, the image plane IMA as one side, and each cemented surface of the cemented lens as one side.
[0063] The parameters for each embodiment that meets the above conditions are shown in Table 1 below:
[0064] Conditional expression Example 1 Example 2 Example 3 Example 4 0.54≤T1 / T2≤1.62 1.494 1.240 0.966 0.937 -0.71≤F1 / F3≤-0.55 -0.689 -0.647 -0.649 -0.628 1.16≤f6 / F3≤1.90 1.544 1.649 1.587 1.810 0.99≤f9 / F3≤4.48 1.055 1.237 1.224 4.472
[0065] Conditional expression Example 5 Example 6 Example 7 0.54≤T1 / T2≤1.62 1.041 0.965 0.665 -0.71≤F1 / F3≤-0.55 -0.663 -0.642 -0.571 1.16≤f6 / F3≤1.90 1.532 1.242 1.275 0.99≤f9 / F3≤4.48 1.182 1.310 1.400
[0066] Table 1
[0067] In an embodiment of the present invention, the plastic aspherical lens of the zoom lens satisfies the following formula:
[0068]
[0069] In the above formula, z is the axial distance from the vertex to the surface at a position perpendicular to the optical axis at a height y; c represents the curvature at the vertex of the aspherical surface; k is the conic coefficient; A4, A6, A8, A 10 A 12 A 14 A 16 ...represent aspheric coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders, respectively.
[0070] Example 1
[0071] The parameters of the zoom lens in this embodiment are as follows:
[0072] The focal length at the wide-angle end is Fw = 6.41mm; the focal length at the telephoto end is Ft = 16.04mm.
[0073] Table 2 lists the relevant parameters of each lens in the zoom lens of this embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and Abbe number.
[0074]
[0075]
[0076] Table 2
[0077] Table 3 lists the aspherical coefficients of each aspherical lens in the zoom lens of this embodiment, including: the quadratic surface constant K, the fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, and the tenth-order aspherical coefficient A... 10 12th order aspherical coefficient A 12 Fourteenth-order aspherical coefficient A 14 and the sixteenth-order aspherical coefficient A 16 .
[0078]
[0079] Table 3
[0080] Table 4 lists the variable spacing values between each lens group when the zoom lens of this embodiment changes from the wide-angle end to the telephoto end.
[0081]
[0082]
[0083] Table 4
[0084] Combination Figure 1As shown in Tables 1 to 4 above, the zoom lens of this embodiment exhibits fast focusing response speed during zooming or magnification across the entire focal length range, achieving a zoom ratio of approximately 2.5x. It also satisfies confocal performance for visible and infrared light across the entire focal length range and achieves a maximum aperture of f / 1.05 during zooming. This zoom lens also incorporates a miniaturized design.
[0085] Example 2
[0086] The parameters of the zoom lens in this embodiment are as follows:
[0087] The focal length at the wide-angle end is Fw = 6.20mm; the focal length at the telephoto end is Ft = 15.52mm.
[0088] Table 5 lists the relevant parameters of each lens in the zoom lens of this embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and Abbe number.
[0089]
[0090]
[0091] Table 5
[0092] Table 6 lists the aspherical coefficients of each aspherical lens in the zoom lens of this embodiment, including: the quadratic surface constant K, the fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, and the tenth-order aspherical coefficient A10. 10 12th order aspherical coefficient A 12 Fourteenth-order aspherical coefficient A 14 and the sixteenth-order aspherical coefficient A 16 .
[0093]
[0094]
[0095] Table 6
[0096] Table 7 lists the variable spacing values between each lens group when the zoom lens of this embodiment changes from the wide-angle end to the telephoto end.
[0097] Wide-angle end telephoto end D1 18.057 2.216 D2 14.380 1.600 D3 2.200 14.980
[0098] Table 7
[0099] Combination Figure 2As shown in Tables 1, 5 to 7 above, the zoom lens of this embodiment exhibits fast focusing response speed during zooming or magnification across the entire focal length range, achieving a zoom ratio of approximately 2.5x. It also satisfies the confocal performance of visible and infrared light across the entire focal length range and achieves a maximum aperture of f / 1.05 during zooming. This zoom lens also incorporates a miniaturized design.
[0100] Example 3
[0101] The parameters of the zoom lens in this embodiment are as follows:
[0102] The focal length at the wide-angle end is Fw = 6.65mm; the focal length at the telephoto end is Ft = 16.65mm.
[0103] Table 8 lists the relevant parameters of each lens in the zoom lens of this embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and Abbe number.
[0104]
[0105]
[0106] Table 8
[0107] Table 9 lists the aspherical coefficients of each aspherical lens in the zoom lens of this embodiment, including: the quadratic surface constant K, the fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, and the tenth-order aspherical coefficient A... 10 12th order aspherical coefficient A 12 Fourteenth-order aspherical coefficient A 14 and the sixteenth-order aspherical coefficient A 16 .
[0108]
[0109] Table 9
[0110] Table 10 lists the variable spacing values between each lens group when the zoom lens of this embodiment changes from the wide-angle end to the telephoto end.
[0111] Wide-angle end telephoto end D1 15.853 2.100 D2 15.842 1.600 D3 2.200 16.442
[0112] Table 10
[0113] Combination Figure 3 As shown in Tables 1, 8 to 10 above, the zoom lens of this embodiment exhibits fast focusing response speed during zooming or magnification across the entire focal length range, achieving a zoom ratio of approximately 2.5x. It also satisfies the confocal performance of visible and infrared light across the entire focal length range and achieves a maximum aperture of f / 1.05 during zooming. This zoom lens also incorporates a miniaturized design.
[0114] Example 4
[0115] The parameters of the zoom lens in this embodiment are as follows:
[0116] The focal length at the wide-angle end is Fw = 6.85mm; the focal length at the telephoto end is Ft = 17.14mm.
[0117] Table 11 lists the relevant parameters of each lens in the zoom lens of this embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and Abbe number.
[0118]
[0119]
[0120] Table 11
[0121] Table 12 lists the aspherical coefficients of each aspherical lens in the zoom lens of this embodiment, including: the quadratic surface constant K, the fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, and the tenth-order aspherical coefficient A... 10 12th order aspherical coefficient A 12 Fourteenth-order aspherical coefficient A 14 and the sixteenth-order aspherical coefficient A 16 .
[0122]
[0123] Table 12
[0124] Table 13 lists the variable spacing values between lens groups when the zoom lens of this embodiment changes from the wide-angle end to the telephoto end.
[0125]
[0126]
[0127] Table 13
[0128] Combination Figure 4 As shown in Tables 1 and 11 to 13 above, the zoom lens of this embodiment exhibits fast focusing response speed during zooming or magnification across the entire focal length range, achieving a zoom ratio of approximately 2.5x. It also satisfies confocal performance for visible and infrared light across the entire focal length range and achieves a maximum aperture of f / 1.05 during zooming. This zoom lens also incorporates a miniaturized design.
[0129] Example 5
[0130] The parameters of the zoom lens in this embodiment are as follows:
[0131] The focal length at the wide-angle end is Fw = 6.89mm; the focal length at the telephoto end is Ft = 17.23mm.
[0132] Table 14 lists the relevant parameters of each lens in the zoom lens of this embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and Abbe number.
[0133]
[0134]
[0135] Table 14
[0136] Table 15 lists the aspherical coefficients of each aspherical lens in the zoom lens of this embodiment, including: the quadratic surface constant K, the fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, and the tenth-order aspherical coefficient A... 10 12th order aspherical coefficient A 12 Fourteenth-order aspherical coefficient A 14 and the sixteenth-order aspherical coefficient A 16 .
[0137]
[0138] Table 15
[0139] Table 16 lists the variable spacing values between lens groups when the zoom lens of this embodiment changes from the wide-angle end to the telephoto end.
[0140] Wide-angle end telephoto end D1 16.660 2.100 D2 15.583 1.600 D3 2.200 16.183
[0141] Table 16
[0142] Combination Figure 5 As shown in Tables 1 and 14 to 16 above, the zoom lens of this embodiment exhibits fast focusing response speed during zooming or magnification across the entire focal length range, achieving a zoom ratio of approximately 2.5x. It also satisfies confocal performance for visible and infrared light across the entire focal length range and achieves a maximum aperture of f / 1.05 during zooming. This zoom lens also incorporates a miniaturized design.
[0143] Example 6
[0144] The parameters of the zoom lens in this embodiment are as follows:
[0145] The focal length at the wide-angle end is Fw = 6.57mm; the focal length at the telephoto end is Ft = 16.45mm.
[0146] Table 17 lists the relevant parameters of each lens in the zoom lens of this embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and Abbe number.
[0147]
[0148]
[0149] Table 17
[0150] Table 18 lists the aspherical coefficients of each aspherical lens in the zoom lens of this embodiment, including: the quadratic surface constant K, the fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, and the tenth-order aspherical coefficient A... 10 12th order aspherical coefficient A 12 Fourteenth-order aspherical coefficient A 14 and the sixteenth-order aspherical coefficient A 16 .
[0151]
[0152]
[0153] Table 18
[0154] Table 19 lists the variable spacing values between lens groups when the zoom lens of this embodiment changes from the wide-angle end to the telephoto end.
[0155] Wide-angle end telephoto end D1 15.524 2.100 D2 15.507 1.600 D3 2.200 16.107
[0156] Table 19
[0157] Combination Figure 6 As shown in Tables 1 and 17 to 19 above, the zoom lens of this embodiment exhibits fast focusing response speed during zooming or magnification across the entire focal length range, achieving a zoom ratio of approximately 2.5x. It also satisfies the confocal performance of visible and infrared light across the entire focal length range and achieves a maximum aperture of f / 1.05 during zooming. This zoom lens also incorporates a miniaturized design.
[0158] Example 7
[0159] The parameters of the zoom lens in this embodiment are as follows:
[0160] The focal length at the wide-angle end is Fw = 6.60mm; the focal length at the telephoto end is Ft = 16.51mm.
[0161] Table 20 lists the relevant parameters of each lens in the zoom lens of this embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and Abbe number.
[0162]
[0163]
[0164] Table 20
[0165] Table 21 lists the aspherical coefficients of each aspherical lens in the zoom lens of this embodiment, including: the quadratic surface constant K, the fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, and the tenth-order aspherical coefficient A... 10 12th order aspherical coefficient A 12 Fourteenth-order aspherical coefficient A 14 and the sixteenth-order aspherical coefficient A 16 .
[0166]
[0167] Table 21
[0168] Table 22 lists the variable spacing values between each lens group when the zoom lens of this embodiment changes from the wide-angle end to the telephoto end.
[0169] Wide-angle end telephoto end D1 12.041 2.100 D2 16.540 1.600 D3 2.200 17.140
[0170] Table 22
[0171] Combination Figure 7 As shown in Tables 1 and 20 to 22 above, the zoom lens of this embodiment exhibits fast focusing response speed during zooming or magnification across the entire focal length range, achieving a zoom ratio of approximately 2.5x. It also satisfies the confocal performance of visible and infrared light across the entire focal length range and achieves a maximum aperture of f / 1.05 during zooming. This zoom lens also incorporates a miniaturized design.
[0172] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A zoom lens, characterized in that, Along the optical axis from the object side to the image side, the lens group consists of, in sequence: a compensating lens group (G1) with negative optical power, a first fixed lens group (G2) with positive optical power, an aperture stop (STO), a zoom lens group (G3) with positive optical power, and a second fixed lens group (G4) with positive optical power, for a total of four lens groups. It also includes a parallel plate (CG) and an image plane (IMA). The compensation lens group (G1) and the zoom lens group (G3) are movable along the optical axis; The moving distance T1 of the compensation lens group (G1) and the moving distance T2 of the zoom lens group (G3) satisfy the following condition: 0.54≤T1 / T2≤1.62; Along the optical axis from the object side to the image side, the compensation lens group (G1) sequentially includes: a first lens (L1), a second lens (L2), a third lens (L3), and a fourth lens (L4), totaling four lenses with optical power; The first lens (L1) and the fourth lens (L4) have negative optical power; The first fixed lens group (G2) includes: a fifth lens (L5) with positive optical power, totaling one lens with optical power; Along the optical axis from the object side to the image side, the zoom lens group (G3) sequentially includes: a sixth lens (L6), a seventh lens (L7), an eighth lens (L8), and a ninth lens (L9), totaling four or five lenses with optical power; the sixth lens (L6) and the ninth lens (L9) have positive optical power. The second fixed lens group (G4) includes, in sequence, the tenth lens (L10), the eleventh lens (L11), the twelfth lens (L12), the thirteenth lens (L13), and the fourteenth lens (L14), totaling five or six lenses with optical power; The tenth lens (L10), the twelfth lens (L12), and the fourteenth lens (L14) have negative optical power, while the eleventh lens (L11) and the thirteenth lens (L13) have positive optical power.
2. The zoom lens according to claim 1, characterized in that, Along the optical axis from the object side to the image side, The first lens (L1) is a convex-concave lens; The second lens (L2) is a concave-convex lens, a concave-concave lens, or a convex-convex lens; The third lens (L3) is a concave-concave lens or a convex-concave lens; The object-side surface of the fourth lens (L4) is concave.
3. The zoom lens according to claim 1, characterized in that, The object-side surface of the fifth lens (L5) is convex.
4. The zoom lens according to claim 1, characterized in that, Along the optical axis from the object side to the image side, The sixth lens (L6) is a convex-convex lens; The seventh lens (L7) is a convex-convex lens, a concave-convex lens, or a concave-concave lens; The eighth lens (L8) is a concave-concave lens, a convex-concave lens, or a convex-convex lens; The ninth lens (L9) is either a convex-convex lens or a concave-convex lens.
5. The zoom lens according to claim 1, characterized in that, The focal length f6 of the sixth lens (L6) and the focal length F3 of the zoom lens group (G3) satisfy the following condition: 1.16≤f6 / F3≤1.
90.
6. The zoom lens according to claim 1, characterized in that, The focal length f9 of the ninth lens (L9) and the focal length F3 of the zoom lens group (G3) satisfy the following condition: 0.99≤f9 / F3≤4.
48.
7. The zoom lens according to claim 1, characterized in that, The zoom lens group (G3) further includes a fifteenth lens (L15), which is located between the first fixed lens group (G2) and the sixth lens (L6).
8. The zoom lens according to claim 7, characterized in that, Along the optical axis from the object side to the image side, the fifteenth lens (L15) is a convex-concave lens or a convex-convex lens.
9. The zoom lens according to claim 1, characterized in that, Along the optical axis from the object side to the image side, The tenth lens (L10) and the twelfth lens (L12) are concave-concave lenses; The eleventh lens (L11) and the thirteenth lens (L13) are convex-convex lenses; The fourteenth lens (L14) is a concave-concave lens, a convex-concave lens, or a concave-convex lens.
10. The zoom lens according to claim 1, characterized in that, The second fixed lens group (G4) further includes a sixteenth lens (L16), which is located between the fourteenth lens (L14) and the parallel plate (CG).
11. The zoom lens according to claim 10, characterized in that, The sixteenth lens (L16) has positive optical power.
12. The zoom lens according to claim 10, characterized in that, Along the optical axis from the object side to the image side, the sixteenth lens (L16) is a convex-concave lens or a convex-convex lens.
13. The zoom lens according to any one of claims 1 to 12, characterized in that, The zoom lens group (G3) contains at least one cemented lens.
14. The zoom lens according to any one of claims 1 to 12, characterized in that, The zoom lens comprises at least two aspherical lenses, of which at least one is a glass aspherical lens.
15. The zoom lens according to any one of claims 1 to 12, characterized in that, The focal length F1 of the compensation lens group (G1) and the focal length F3 of the zoom lens group (G3) satisfy the following condition: -0.71≤F1 / F3≤-0.55.