A zoom lens

Abstract

This invention provides a zoom lens, comprising a first fixed lens group with positive optical power, a first zoom lens group with negative optical power, a second fixed lens group with positive optical power, a focusing lens group with negative optical power, a second zoom lens group with positive optical power, and a third fixed lens group with negative optical power. The first fixed lens group includes a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, and a fourth lens with positive optical power. The first zoom lens group includes a fifth lens with negative optical power, a sixth lens with negative optical power, and a seventh lens with positive optical power. The second fixed lens group includes an eighth lens with positive optical power, a ninth lens with either positive or negative optical power, a tenth lens with negative optical power, and an eleventh lens with positive optical power. The third fixed lens group includes a fourteenth lens with negative optical power. This achieves a zoom lens with small size, high magnification, large aperture, and infrared high / low temperature confocal focusing capability.

Description

Technical Field

[0001] This invention relates to the field of optical lens technology, and more particularly to a zoom lens. Background Technology

[0002] In the security field, zoom lenses have been widely used due to their advantages such as long shooting distance and wide shooting angle. With the development of technology, cameras are gradually moving towards miniaturization and refinement, which also puts forward more stringent requirements for mainstream zoom lenses.

[0003] Currently, 1 / 1.8” sensors are gradually being widely used, but traditional zoom lenses typically use 1 / 2.7” sensors. Traditional zoom lenses using 1 / 1.8” sensors suffer from problems such as low magnification, small aperture, and non-confocal infrared. Summary of the Invention

[0004] This invention provides a zoom lens that achieves small size, high magnification, large aperture, and infrared high and low temperature confocal focusing, and is capable of working with a 1 / 1.8” chip to produce high-quality zoom lenses.

[0005] This invention provides a zoom lens, comprising a first fixed lens group with positive optical power, a first zoom lens group with negative optical power, a second fixed lens group with positive optical power, a focusing lens group with negative optical power, a second zoom lens group with positive optical power, and a third fixed lens group with negative optical power, arranged sequentially along the optical axis from the object side to the image side.

[0006] The first fixed lens group includes a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, and a fourth lens with positive optical power, arranged sequentially along the optical axis from the object side to the image side.

[0007] The first zoom lens group includes a fifth lens with negative optical power, a sixth lens with negative optical power, and a seventh lens with positive optical power, arranged sequentially from the object side to the image side along the optical axis.

[0008] The second fixed lens group includes an eighth lens with positive optical power, a ninth lens with positive or negative optical power, a tenth lens with negative optical power, and an eleventh lens with positive optical power, arranged sequentially from the object side to the image side along the optical axis.

[0009] The third fixed lens group includes a fourteenth lens with negative optical power.

[0010] Optionally, the focusing lens group includes a twelfth lens with negative optical power;

[0011] The second zoom lens group includes a thirteenth lens with positive optical power;

[0012] The thirteenth lens is a glass aspherical lens.

[0013] Optionally, the fourteenth lens is a concave-convex lens, and / or the twelfth lens is a concave-concave lens.

[0014] Optionally, the focal length of the first fixed lens group is F1, the focal length of the first zoom lens group is F2, the focal length of the second fixed lens group is F3, the focal length of the focusing lens group is F4, the focal length of the second zoom lens group is F5, the focal length of the third fixed lens group is F6, and the focal length of the zoom lens at the wide-angle end is FW, satisfying at least one of the following:

[0015] ;

[0016] ;

[0017] ;

[0018] ;

[0019] ;

[0020] .

[0021] Optionally, the distance between the closest and farthest positions of the focusing lens group to the image plane during movement is S4, and the distance between the closest and farthest positions of the second zoom lens group to the image plane during movement is S5, satisfying:

[0022] .

[0023] Optionally, it also includes an aperture stop located between the first zoom lens group and the second fixed lens group;

[0024] The eighth lens is a glass aspherical lens;

[0025] The second fixed lens group includes a cemented lens group consisting of at least two lenses.

[0026] Optionally, the refractive index of the fifth lens is nd5, the refractive index of the sixth lens is nd6, the refractive index of the seventh lens is nd7, the refractive index of the eighth lens is nd8, the refractive index of the fourteenth lens is nd14, the Abbe number of the fifth lens is vd5, the Abbe number of the sixth lens is vd6, the Abbe number of the seventh lens is vd7, the Abbe number of the eighth lens is vd8, and the Abbe number of the fourteenth lens is vd14, satisfying at least one of the following:

[0027] ; ;

[0028] ; ;

[0029] ; ;

[0030] ; ;

[0031] ; .

[0032] Optionally, it also includes an aperture stop located between the first zoom lens group and the second fixed lens group;

[0033] The zoom lens has a focal length of FW at the wide-angle end, and the diameter of the image formed by the aperture relative to the first fixed lens group and the first zoom lens group at the wide-angle end is EPDW.

[0034] satisfy: .

[0035] Optionally, the maximum lens diameter in the focusing lens group is ΦG1, and the total optical length of the zoom lens at the wide-angle end is TTL.

[0036] satisfy: .

[0037] Optionally, the sixth lens is a glass aspherical lens;

[0038] And / or, the first lens and the second lens are cemented together to form a cemented lens group.

[0039] This invention provides a six-element zoom lens, including a first fixed lens group, a first zoom lens group, a second fixed lens group, a focusing lens group, a second zoom lens group, and a third fixed lens group. By changing the positions of the first zoom lens group, the second fixed lens group, and the focusing lens group on the optical axis, the zoom lens can switch between wide-angle and telephoto ends. The first fixed lens group can adjust the distortion of the zoom lens, improving its imaging effect; the negative optical power of the first zoom lens group ensures a large aperture before light enters the aperture stop, increasing the zoom lens's aperture. This zoom lens achieves short focal length confocal focusing in the 436nm-850nm wavelength range at a 1 / 1.8″ aperture, with a larger aperture and higher image quality, suitable for a wider range of usage needs. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention;

[0041] Figure 2 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention;

[0042] Figure 3 The axial aberration curve of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention;

[0043] Figures 4-9 This is a ray fan diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention;

[0044] Figure 10 This is a transverse chromatic aberration diagram of a zoom lens at the wide-angle end, provided in Embodiment 1 of the present invention.

[0045] Figure 11 The axial aberration curve of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention;

[0046] Figures 12-17 This is a ray fan diagram of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention;

[0047] Figure 18 This is a transverse chromatic aberration diagram of a zoom lens at the telephoto end provided in Embodiment 1 of the present invention;

[0048] Figure 19 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention;

[0049] Figure 20 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention;

[0050] Figure 21 The axial aberration curve of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention;

[0051] Figures 22-27 This is a ray fan diagram of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention;

[0052] Figure 28 This is a transverse chromatic aberration diagram of a zoom lens at the wide-angle end provided in Embodiment 2 of the present invention;

[0053] Figure 29 The axial aberration curve of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention;

[0054] Figures 30-35 This is a ray fan pattern of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention;

[0055] Figure 36 This is a transverse chromatic aberration diagram of a zoom lens at the telephoto end provided in Embodiment 2 of the present invention;

[0056] Figure 37 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention;

[0057] Figure 38 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention;

[0058] Figure 39 The axial aberration curve of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention;

[0059] Figures 40-45 This is a ray fan diagram of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention;

[0060] Figure 46 This is a transverse chromatic aberration diagram of a zoom lens at the wide-angle end provided in Embodiment 3 of the present invention;

[0061] Figure 47 The axial aberration curve of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention;

[0062] Figures 48-53 This is a ray fan diagram of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention;

[0063] Figure 54 This is a transverse chromatic aberration diagram of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention. Detailed Implementation

[0064] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0065] Example 1

[0066] Figure 1 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention. Figure 2 This is a schematic diagram of the zoom lens at the telephoto end according to Embodiment 1 of the present invention, with reference to... Figure 1 and Figure 2 The zoom lens includes a first fixed lens group G1 with positive optical power, a first zoom lens group G2 with negative optical power, a second fixed lens group G3 with positive optical power, a focusing lens group G4 with negative optical power, a second zoom lens group G5 with positive optical power, and a third fixed lens group G6 with negative optical power, arranged sequentially from the object side to the image side along the optical axis.

[0067] The first fixed lens group G1 includes a first lens L1 with negative optical power, a second lens L2 with positive optical power, a third lens L3 with positive optical power, and a fourth lens L4 with positive optical power, arranged sequentially from the object side to the image side along the optical axis; the first zoom lens group G2 includes a fifth lens L5 with negative optical power, a sixth lens L6 with negative optical power, and a seventh lens L7 with positive optical power, arranged sequentially from the object side to the image side along the optical axis; the second fixed lens group G3 includes an eighth lens L8 with positive optical power, a ninth lens L9 with positive or negative optical power, a tenth lens L10 with negative optical power, and an eleventh lens L11 with positive optical power, arranged sequentially from the object side to the image side along the optical axis; the third fixed lens group G6 includes a fourteenth lens L14 with negative optical power.

[0068] This invention provides a six-element zoom lens, including a first fixed lens group G1, a first zoom lens group G2, a second fixed lens group G3, a focusing lens group G4, a second zoom lens group G5, and a third fixed lens group G6. By changing the positions of the first zoom lens group G2, the second fixed lens group G3, and the focusing lens group G4 on the optical axis, the zoom lens can switch between wide-angle and telephoto ends. The first fixed lens group G1 can adjust the distortion of the zoom lens, improving its imaging effect; the negative optical power of the first zoom lens group G2 ensures a large aperture before light enters the aperture stop, increasing the zoom lens's aperture. This zoom lens achieves short focal length confocal focusing in the 436nm-850nm wavelength range at a 1 / 1.8″ aperture, with a larger aperture and higher image quality, suitable for a wider range of usage needs.

[0069] Optionally, the focusing lens group G4 includes a twelfth lens L12 with negative optical power; the second zoom lens group G5 includes a thirteenth lens L13 with positive optical power; the thirteenth lens L13 is a glass aspherical lens. The focusing lens group G4 and the second zoom lens group G5 each include only one lens. This single-lens group structure allows for control over the group's volume, resulting in a greater movable distance within the overall zoom lens structure, increasing the zoom range and broadening the application scenarios of the zoom lens. The lens in the second zoom lens group G5 is a glass aspherical lens. The second zoom lens group G5, with its longer travel, needs to compensate for aberrations throughout the zoom lens during movement; using an aspherical lens provides better compensation and higher image quality.

[0070] Optionally, the fourteenth lens L14 is a concave-convex lens, and / or the twelfth lens L12 is a concave-concave lens. The object-side surface of the concave-convex lens is concave towards the object side, and the image-side surface is convex towards the image side. The concave-concave lens is a biconcave lens. The twelfth lens L12 being a concave-concave lens ensures good zoom performance for the zoom lens; the fourteenth lens L14, as the third fixed lens group G6, and being a concave-convex lens, can control the exit angle of the zoom lens's tail-end conduit, achieving a larger light beam height on the image plane and meeting the requirements for large target surfaces.

[0071] Optionally, the focal length of the first fixed lens group G1 is F1, the focal length of the first zoom lens group G2 is F2, the focal length of the second fixed lens group G3 is F3, the focal length of the focusing lens group G4 is F4, the focal length of the second zoom lens group G5 is F5, the focal length of the third fixed lens group G6 is F6, and the focal length of the zoom lens at the wide-angle end is FW, satisfying at least one of the following: ; ; ; ; ; By using this focal length combination, a reasonable balance of optical power is achieved, allowing light to pass through the zoom lens more smoothly and largely correcting the impact of advanced aberrations of the zoom lens on image quality.

[0072] Optionally, the distance between the closest and farthest positions of the focusing lens group G4 to the image plane during its movement is S4, and the distance between the closest and farthest positions of the second zoom lens group G5 to the image plane during its movement is S5, satisfying: By controlling the travel ratio between the focusing lens group G4 and the second zoom lens group G5 during their movement, the moving areas of the focusing lens group G4 and the second zoom lens group G5 overlap, but they do not collide during zooming, thus minimizing the size of the zoom lens.

[0073] Optionally, the zoom lens also includes an aperture stop STO, located between the first zoom lens group G2 and the second fixed lens group G3; the eighth lens L8 is a glass aspherical lens; the second fixed lens group G3 contains a cemented lens group consisting of at least two lenses. Light passing through the aperture stop STO will produce higher-order aberrations, and the best way to reduce these aberrations at the rear end is to reduce them at the front end. The eighth lens L8 is a glass aspherical lens, and aspherical lenses have a good corrective effect on higher-order aberrations. Combined with the cemented lens group in the second fixed lens group G3, this not only improves image quality but also corrects the aberrations of the second fixed lens group G3 itself, ensuring good image quality throughout the zoom process.

[0074] For example, the cemented lens group in the second fixed lens group G3 may include two, three, or four adjacent lenses from the eighth lens L8, the ninth lens L9, the tenth lens L10, and the eleventh lens L11. In one example, the tenth lens L10 and the eleventh lens L11 form a cemented lens group.

[0075] Optionally, the refractive index of the fifth lens L5 is nd5, the refractive index of the sixth lens L6 is nd6, the refractive index of the seventh lens L7 is nd7, the refractive index of the eighth lens L8 is nd8, the refractive index of the fourteenth lens L14 is nd14, the Abbe number of the fifth lens L5 is vd5, the Abbe number of the sixth lens L6 is vd6, the Abbe number of the seventh lens L7 is vd7, the Abbe number of the eighth lens L8 is vd8, and the Abbe number of the fourteenth lens L14 is vd14, satisfying at least one of the following:

[0076] ; ;

[0077] ; ;

[0078] ; ;

[0079] ; ;

[0080] ; .

[0081] In zoom lenses, the first zoom lens group G2, located before the aperture stop STO, plays a dominant role in adjusting the lens magnification. Using materials with the aforementioned refractive index, combined with the lens's optical power, it corrects aberrations and controls the zoom lens's high and low temperature conditions. Simultaneously, it reduces the size of the first zoom lens group G2, allowing for greater movement within the zoom lens and accommodating usage requirements under varying temperature conditions while increasing the lens magnification. Furthermore, the eighth lens L8 in the second fixed lens group G3 serves the same purpose. The fourteenth lens L14 in the third fixed lens group G6, using materials with the aforementioned refractive index, can better control the light emission angle of the zoom lens, thereby controlling the image quality and target surface size.

[0082] Optionally, the zoom lens also includes an aperture stop STO, located between the first zoom lens group G2 and the second fixed lens group G3; the focal length of the zoom lens at the wide-angle end is FW, and the diameter of the image formed by the aperture stop STO relative to the first fixed lens group G1 and the first zoom lens group G2 at the wide-angle end is EPDW, satisfying: Placing the aperture stop STO between the first zoom lens group G2 and the second fixed lens group G3 can balance lens aberrations and prevent the inability to correct advanced aberrations generated by the lens at the rear of the lens, which would lead to a decrease in the image quality of the zoom lens. It also ensures that the ratio of the focal length at the wide-angle end of the zoom lens to the entrance pupil diameter at the wide-angle end can control the imaging of the zoom lens and meet the needs of use in darker environments.

[0083] Optionally, the maximum lens diameter in the focusing lens group G4 is ΦG1, and the total optical length of the zoom lens at the wide-angle end is TTL, satisfying: This design allows for control over lens size, enabling a more compact zoom lens while maximizing the field of view and light intake to meet usage needs in various environments.

[0084] Optionally, the sixth lens L6 is a glass aspherical lens; and / or, the first lens L1 and the second lens L2 are cemented together to form a cemented lens group.

[0085] In the zoom lens provided in this embodiment, the first fixed lens group G1, the first zoom lens group G2, the second fixed lens group G3, the focusing lens group G4, the second zoom lens group G5, and the third fixed lens group G6 can be arranged in one lens barrel. Figure 1 (Not shown in the image). The first fixed lens group G1, the second fixed lens group G3, and the third fixed lens group G6 are fixed in position within the lens barrel. The first zoom lens group G2, the focusing lens group G4, and the second zoom lens group G5 can reciprocate along the optical axis within the lens barrel. Through the combined movement of the first zoom lens group G2, the focusing lens group G4, and the second zoom lens group G5, the focal length of the zoom lens can continuously change from the wide-angle end to the telephoto end, ensuring high image quality at all focal points.

[0086] It is understandable that during the zoom process achieved by moving the first zoom lens group G2, the focusing lens group G4, and the second zoom lens group G5, the zoom lens is at its shortest focal length, i.e., at the wide-angle end, and at its longest focal length, i.e., at the telephoto end. At the wide-angle end and the telephoto end, the zoom lens has different focal lengths and optical powers, as well as different lengths or shapes.

[0087] For example, the zoom lens may further include a flat glass CG, which is located on the side of the fourteenth lens L14 away from the first lens L1 and on the side of the fourteenth lens L14 adjacent to the image plane, to protect the photosensitive chip in the imaging sensor. The photosensitive chip is used to convert the light signals collected by the zoom lens into electrical signals, thereby ensuring the imaging effect of the zoom lens.

[0088] For example, the aspherical lens (including glass aspherical lens) of a zoom lens satisfies the following formula:

[0089]

[0090] Where Z is the axial distance from the vertex of the surface at a position perpendicular to the optical axis and at a height of r along the optical axis; c represents the curvature at the vertex of the aspherical surface; These are the higher-order aspheric coefficients corresponding to the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders of aspheric surfaces. These can be combined to form higher-order terms for the corresponding aspherical surfaces. The numbers are 4, 6, 8, 10, 12, 14, and 16 respectively.

[0091] Table 1. Design values ​​for a zoom lens in Example 1.

[0092]

[0093] Table 1 shows one design value for the zoom lens in Embodiment 1. The specific values ​​can be adjusted according to product requirements and are not intended to limit the embodiments of the present invention. The zoom lens shown in Table 1 can be... Figure 1 and Figure 2 As shown in Table 1, a lens typically consists of two surfaces, each serving as a refractive surface. The surface numbers in Table 1 are assigned based on the surfaces of each lens. Surface number 1 represents the front surface (object side) of the first lens L1, surface number 2 represents the rear surface (image side) of the first lens L1, and so on. The radius of curvature represents the degree of curvature of the lens surface. A positive radius of curvature value indicates that the center of curvature is on the side of the surface closer to the image plane IMA; a negative radius of curvature value indicates that the center of curvature is on the side of the surface farther from the image plane IMA. "Inf" in the radius of curvature column indicates that the surface is planar with an infinite radius of curvature, expressed in mm. The value in the thickness column represents the axial distance between the centers of the current surface and the next surface, expressed in mm. The refractive index column represents the refractive index of the medium between the current and next surfaces, representing the material's ability to deflect light between them. The blank space in the refractive index column represents the refractive index of air, which is 1. The Abbe number represents the dispersion characteristics of light by the material between the current surface and the next surface; a blank space indicates that the current location is air.

[0094] Table 2. Zoom interval design values ​​for the zoom lens in Example 1

[0095]

[0096] The zoom intervals in Table 2 are the different interval values ​​for the zoom lens at the wide-angle end and the telephoto end.

[0097] Table 3 Aspherical coefficients of the zoom lens in Example 1

[0098]

[0099] The "Surface Number" column in Table 3 has the same meaning as the "Surface Number" column in Table 1. For example, surface number 3 also represents the front surface of the second lens L2. In the various embodiments of the present invention, "E" represents an exponent with a base of 10.

[0100] For example, in Embodiment 1, the maximum achievable diameter of the image plane at both the wide-angle and telephoto ends of the zoom lens is 9.2 mm. The focal length at the wide-angle end is 6.8 mm, and the focal length at the telephoto end is 115.71 mm. The zoom lens is suitable for wavelengths from 436 nm to 850 nm at the wide-angle end and from 436 nm to 656 nm at the telephoto end. The F / # (F-number) of the zoom lens is 1.61 to 3.52. The total optical length of the zoom lens at both the wide-angle and telephoto ends is 92.48 mm.

[0101] Figure 3 This diagram illustrates the axial aberration curve of a zoom lens at the wide-angle end. The dominant wavelength is 546.074 nm, and the horizontal direction represents the axial offset relative to a specified target surface, in millimeters (mm). Figure 3 It can be seen that the axial aberrations of different wavelengths from 0 to 1.0 normalized aperture are all controlled within a reasonable range, indicating that the axial chromatic aberration of the zoom lens is well controlled at the wide-angle end, meeting the basic requirement of clear imaging at night and achieving the effect of clear imaging across the entire wavelength range.

[0102] like Figures 4-9 As shown. The horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. Ideally, each curve should completely coincide with the horizontal axis, in which case all rays in the field of view focus at the same point on the image plane; the vertical axis can also represent the maximum dispersion range of the beam on the ideal image plane. The fan diagram can not only reflect monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figures 4-9 It can be seen that this zoom lens closely approximates the horizontal axis at all wavelengths across all fields of view, indicating that its transverse aberrations at all wavelengths are well corrected. In addition, the curves for each color do not show significant dispersion, indicating that this zoom lens also has good correction for chromatic aberration, ensuring the imaging requirement of sharp images across the entire wavelength range.

[0103] Figure 10This diagram illustrates the transverse chromatic aberration curve of a zoom lens at the wide-angle end. The vertical direction represents the normalized aperture, with 0 indicating the optical axis. The vertex in the transverse direction represents the maximum field of view. The dominant wavelength is 546.074 nm, and the horizontal direction represents the offset relative to the dominant wavelength, in micrometers (µm). Figure 10 It can be seen that the transverse chromatic aberration of different wavelengths is controlled within a reasonable range, indicating that the transverse chromatic aberration of the zoom lens is well controlled at the wide-angle end, which can meet the requirements of wide spectrum application across the entire wavelength range.

[0104] Figure 11 This diagram illustrates the axial aberration curve of a zoom lens at the telephoto end, using a dominant wavelength of 546.074 nm. The horizontal direction represents the axial offset relative to a specified target surface, expressed in millimeters (mm). Figure 11 It can be seen that the axial aberrations of the normalized apertures of different wavelengths from 0 to 1.0 are all controlled within a reasonable range, indicating that the axial chromatic aberration of the zoom lens is well controlled at the wide-angle end, meeting the basic requirement of clear imaging at night and achieving the effect of clear imaging across the entire visible light spectrum.

[0105] like Figures 12-17 As shown in the figure. The horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. Ideally, each curve should completely coincide with the horizontal axis, at which point all rays in the field of view should focus at the same point on the image plane; the vertical axis can also represent the maximum dispersion range of the beam on the ideal image plane. The fan diagram can not only reflect monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figures 12-17 It can be seen that this zoom lens closely approximates the horizontal axis at all wavelengths across all fields of view, indicating that its transverse aberrations at all wavelengths are well corrected. In addition, the curves for each color do not show significant dispersion, indicating that this zoom lens also has good correction for chromatic aberration, ensuring the imaging requirement of sharp images across the entire visible light spectrum.

[0106] Figure 18 This diagram illustrates the transverse chromatic aberration curve of a zoom lens at the telephoto end. The vertical direction represents the normalized aperture, with 0 indicating on the optical axis. The vertex in the transverse direction represents the maximum field of view. The dominant wavelength is 546.074 nm, and the horizontal direction represents the offset relative to the dominant wavelength, in micrometers (µm). Figure 18 It can be seen that the transverse chromatic aberration of different wavelengths is controlled within a reasonable range, indicating that the transverse chromatic aberration of the zoom lens is well controlled at the telephoto end, which can meet the requirements of wide-spectrum applications across the entire visible light band.

[0107] Example 2

[0108] Similarities to the above embodiments will not be repeated here.

[0109] Table 4. Design values ​​for the zoom lens in Example 2.

[0110]

[0111] Table 4 shows one design value for the zoom lens in Embodiment 2. The specific values ​​can be adjusted according to product requirements and are not intended to limit the embodiments of the present invention. The zoom lens shown in Table 4 can be... Figure 19 and Figure 20 As shown in the image.

[0112] Table 5. Zoom interval design values ​​for the zoom lens in Example 2.

[0113]

[0114] The zoom intervals in Table 5 are the different interval values ​​for the zoom lens at the wide-angle and telephoto ends.

[0115] Table 6 Aspherical coefficients of the zoom lens in Example 2

[0116]

[0117] The meaning of the "Face Number" column in Table 6 is consistent with that in Table 4. In the embodiments of this invention, "E" represents a base-10 exponent.

[0118] For example, in Embodiment 2, the maximum achievable diameter of the image plane at both the wide-angle and telephoto ends of the zoom lens is 9.2 mm. The focal length of the zoom lens at the wide-angle end is 6.94 mm, and at the telephoto end it is 90.4 mm. The zoom lens is suitable for wavelengths from 436 nm to 850 nm at the wide-angle end and from 436 nm to 656 nm at the telephoto end. The F / # (F-number) of the zoom lens is 1.60 to 3.52. The total optical length of the zoom lens at both the wide-angle and telephoto ends is 96.13 mm.

[0119] Figure 21 This diagram illustrates the axial aberration curve of a zoom lens at the wide-angle end. The dominant wavelength is 546.074 nm, and the horizontal direction represents the axial offset relative to a specified target surface, in millimeters (mm). Figure 21 It can be seen that the axial aberrations of different wavelengths from 0 to 1.0 normalized aperture are all controlled within a reasonable range, indicating that the axial chromatic aberration of the zoom lens is well controlled at the wide-angle end, meeting the basic requirement of clear imaging at night and achieving the effect of clear imaging across the entire wavelength range.

[0120] like Figures 22-27As shown. The horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. Ideally, each curve should completely coincide with the horizontal axis, in which case all rays in the field of view focus at the same point on the image plane; the vertical axis can also represent the maximum dispersion range of the beam on the ideal image plane. The fan diagram can not only reflect monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figures 22-27 It can be seen that this zoom lens closely approximates the horizontal axis at all wavelengths across all fields of view, indicating that its transverse aberrations at all wavelengths are well corrected. In addition, the curves for each color do not show significant dispersion, indicating that this zoom lens also has good correction for chromatic aberration, ensuring the imaging requirement of sharp images across the entire wavelength range.

[0121] Figure 28 This diagram illustrates the transverse chromatic aberration curve of a zoom lens at the wide-angle end. The vertical direction represents the normalized aperture, with 0 indicating the optical axis. The vertex in the transverse direction represents the maximum field of view. The dominant wavelength is 546.074 nm, and the horizontal direction represents the offset relative to the dominant wavelength, in micrometers (µm). Figure 28 It can be seen that the transverse chromatic aberration of different wavelengths is controlled within a reasonable range, indicating that the transverse chromatic aberration of the zoom lens is well controlled at the wide-angle end, which can meet the requirements of wide spectrum application across the entire wavelength range.

[0122] Figure 29 This diagram illustrates the axial aberration curve of a zoom lens at the telephoto end, using a dominant wavelength of 546.074 nm. The horizontal direction represents the axial offset relative to a specified target surface, expressed in millimeters (mm). Figure 29 It can be seen that the axial aberrations of different wavelengths with normalized apertures of 0.3 to 1.0 are all controlled within a reasonable range, indicating that the axial chromatic aberration of the zoom lens is well controlled at the wide-angle end, meeting the basic requirement of clear imaging at night and achieving the effect of clear imaging across the entire visible light spectrum.

[0123] like Figures 30-35 As shown in the figure. The horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. Ideally, each curve should completely coincide with the horizontal axis, at which point all rays in the field of view should focus at the same point on the image plane; the vertical axis can also represent the maximum dispersion range of the beam on the ideal image plane. The fan diagram can not only reflect monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figures 30-35 It can be seen that this zoom lens closely approximates the horizontal axis at all wavelengths across all fields of view, indicating that its transverse aberrations at all wavelengths are well corrected. In addition, the curves for each color do not show significant dispersion, indicating that this zoom lens also has good correction for chromatic aberration, ensuring the imaging requirement of sharp images across the entire visible light spectrum.

[0124] Figure 36This diagram illustrates the transverse chromatic aberration curve of a zoom lens at the telephoto end. The vertical direction represents the normalized aperture, with 0 indicating on the optical axis. The vertex in the transverse direction represents the maximum field of view. The dominant wavelength is 546.074 nm, and the horizontal direction represents the offset relative to the dominant wavelength, in micrometers (µm). Figure 36 It can be seen that the transverse chromatic aberration of different wavelengths is controlled within a reasonable range, indicating that the transverse chromatic aberration of the zoom lens is well controlled at the telephoto end, which can meet the requirements of wide-spectrum applications across the entire visible light band.

[0125] Example 3

[0126] Similarities to the above embodiments will not be repeated here.

[0127] Table 7. One design value for the zoom lens in Example 3.

[0128]

[0129] Table 7 shows one design value for the zoom lens in Embodiment 3. The specific values ​​can be adjusted according to product requirements and are not intended to limit the embodiments of the present invention. The zoom lens shown in Table 7 can be... Figure 37 and Figure 38 As shown in the image.

[0130] Table 8. Zoom interval design values ​​for the zoom lens in Example 3.

[0131]

[0132] The zoom intervals in Table 8 are the different interval values ​​for the zoom lens at the wide-angle and telephoto ends.

[0133] Table 9 Aspherical coefficients of the zoom lens in Example 3

[0134]

[0135] The meaning of the "Face Number" column in Table 9 is consistent with that in Table 7. In the embodiments of this invention, "E" represents a base-10 exponent.

[0136] For example, in Embodiment 3, the maximum achievable diameter of the image plane at both the wide-angle and telephoto ends of the zoom lens is 9.2 mm. The focal length at the wide-angle end is 5.78 mm, and the focal length at the telephoto end is 105.3 mm. The zoom lens is suitable for wavelengths from 436 nm to 850 nm at the wide-angle end and from 436 nm to 656 nm at the telephoto end. The F / # (F-number) of the zoom lens ranges from 1.60 to 3.49. The total optical length of the zoom lens at both the wide-angle and telephoto ends is 96.28 mm.

[0137] Figure 39 This diagram illustrates the axial aberration curve of a zoom lens at the wide-angle end. The dominant wavelength is 546.074 nm, and the horizontal direction represents the axial offset relative to a specified target surface, in millimeters (mm). Figure 39 It can be seen that the axial aberrations of different wavelengths from 0 to 1.0 normalized aperture are all controlled within a reasonable range, indicating that the axial chromatic aberration of the zoom lens is well controlled at the wide-angle end, meeting the basic requirement of clear imaging at night and achieving the effect of clear imaging across the entire wavelength range.

[0138] like Figures 40-45 As shown. The horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. Ideally, each curve should completely coincide with the horizontal axis, in which case all rays in the field of view focus at the same point on the image plane; the vertical axis can also represent the maximum dispersion range of the beam on the ideal image plane. The fan diagram can not only reflect monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figures 40-45 It can be seen that this zoom lens closely approximates the horizontal axis at all wavelengths across all fields of view, indicating that its transverse aberrations at all wavelengths are well corrected. In addition, the curves for each color do not show significant dispersion, indicating that this zoom lens also has good correction for chromatic aberration, ensuring the imaging requirement of sharp images across the entire wavelength range.

[0139] Figure 46 This diagram illustrates the transverse chromatic aberration curve of a zoom lens at the wide-angle end. The vertical direction represents the normalized aperture, with 0 indicating the optical axis. The vertex in the transverse direction represents the maximum field of view. The dominant wavelength is 546.074 nm, and the horizontal direction represents the offset relative to the dominant wavelength, in micrometers (µm). Figure 46 It can be seen that the transverse chromatic aberration of different wavelengths is controlled within a reasonable range, indicating that the transverse chromatic aberration of the zoom lens is well controlled at the wide-angle end, which can meet the requirements of wide spectrum application across the entire wavelength range.

[0140] Figure 47 This diagram illustrates the axial aberration curve of a zoom lens at the telephoto end, using a dominant wavelength of 546.074 nm. The horizontal direction represents the axial offset relative to a specified target surface, expressed in millimeters (mm). Figure 47 It can be seen that the axial aberrations of the normalized apertures of different wavelengths from 0 to 1.0 are all controlled within a reasonable range, indicating that the axial chromatic aberration of the zoom lens is well controlled at the wide-angle end, meeting the basic requirement of clear imaging at night and achieving the effect of clear imaging across the entire visible light spectrum.

[0141] like Figures 48-53As shown in the figure. The horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. Ideally, each curve should completely coincide with the horizontal axis, at which point all rays in the field of view should focus at the same point on the image plane; the vertical axis can also represent the maximum dispersion range of the beam on the ideal image plane. The fan diagram can not only reflect monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figures 48-53 It can be seen that this zoom lens closely approximates the horizontal axis at all wavelengths across all fields of view, indicating that its transverse aberrations at all wavelengths are well corrected. In addition, the curves for each color do not show significant dispersion, indicating that this zoom lens also has good correction for chromatic aberration, ensuring the imaging requirement of sharp images across the entire visible light spectrum.

[0142] Figure 54 This diagram illustrates the transverse chromatic aberration curve of a zoom lens at the telephoto end. The vertical direction represents the normalized aperture, with 0 indicating on the optical axis. The vertex in the transverse direction represents the maximum field of view. The dominant wavelength is 546.074 nm, and the horizontal direction represents the offset relative to the dominant wavelength, in micrometers (µm). Figure 54 It can be seen that the transverse chromatic aberration of different wavelengths is controlled within a reasonable range, indicating that the transverse chromatic aberration of the zoom lens is well controlled at the telephoto end, which can meet the requirements of wide-spectrum applications across the entire visible light band.

[0143] Table 10 Parameter design values ​​for each embodiment

[0144]

[0145] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A zoom lens, characterized in that, It includes a first fixed lens group with positive optical power, a first zoom lens group with negative optical power, a second fixed lens group with positive optical power, a focusing lens group with negative optical power, a second zoom lens group with positive optical power, and a third fixed lens group with negative optical power, arranged sequentially from the object side to the image side along the optical axis; the number of lens groups with optical power is 6. The first fixed lens group includes a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, and a fourth lens with positive optical power, arranged sequentially along the optical axis from the object side to the image side. The first zoom lens group includes a fifth lens with negative optical power, a sixth lens with negative optical power, and a seventh lens with positive optical power, arranged sequentially from the object side to the image side along the optical axis. The second fixed lens group includes an eighth lens with positive optical power, a ninth lens with positive or negative optical power, a tenth lens with negative optical power, and an eleventh lens with positive optical power, arranged sequentially from the object side to the image side along the optical axis. The third fixed lens group includes a fourteenth lens with negative optical power; The focusing lens group includes a twelfth lens with negative optical power; The second zoom lens group includes a thirteenth lens with positive optical power; It also includes an aperture stop, which is located between the first zoom lens group and the second fixed lens group; The zoom lens has a focal length of FW at the wide-angle end, and the diameter of the image formed by the aperture relative to the first fixed lens group and the first zoom lens group at the wide-angle end is EPDW. satisfy: .

2. The zoom lens according to claim 1, characterized in that, The thirteenth lens is a glass aspherical lens.

3. The zoom lens according to claim 2, characterized in that, The fourteenth lens is a concave-convex lens, and / or the twelfth lens is a concave-concave lens.

4. The zoom lens according to claim 1, characterized in that, The focal length of the first fixed lens group is F1, the focal length of the first zoom lens group is F2, the focal length of the second fixed lens group is F3, the focal length of the focusing lens group is F4, the focal length of the second zoom lens group is F5, the focal length of the third fixed lens group is F6, and the focal length of the zoom lens at the wide-angle end is FW, satisfying at least one of the following: 。 5. The zoom lens according to claim 1, characterized in that, The distance between the closest and farthest positions of the focusing lens group to the image plane during the movement is S4, and the distance between the closest and farthest positions of the second zoom lens group to the image plane during the movement is S5, satisfying the following: 。 6. The zoom lens according to claim 1, characterized in that, It also includes an aperture stop, which is located between the first zoom lens group and the second fixed lens group; The eighth lens is a glass aspherical lens; The second fixed lens group includes a cemented lens group consisting of at least two lenses.

7. The zoom lens according to claim 1, characterized in that, The refractive index of the fifth lens is nd5, the refractive index of the sixth lens is nd6, the refractive index of the seventh lens is nd7, the refractive index of the eighth lens is nd8, the refractive index of the fourteenth lens is nd14, the Abbe number of the fifth lens is vd5, the Abbe number of the sixth lens is vd6, the Abbe number of the seventh lens is vd7, the Abbe number of the eighth lens is vd8, and the Abbe number of the fourteenth lens is vd14, satisfying at least one of the following: 。 8. The zoom lens according to claim 1, characterized in that, The maximum lens diameter in the focusing lens group is ΦG1, and the total optical length of the zoom lens at the wide-angle end is TTL. satisfy: .

9. The zoom lens according to claim 1, characterized in that, The sixth lens is a glass aspherical lens; And / or, the first lens and the second lens are cemented together to form a cemented lens group.

Images