A zoom lens

Abstract

The application discloses a zoom lens, which comprises a first fixed lens group, a first variable lens group, a second variable lens group, a focusing lens group and a second fixed lens group; the optical power of the first fixed lens group, the second variable lens group and the focusing lens group is positive, and the optical power of the first variable lens group is negative; the first fixed lens group comprises a first to fourth lens; the first variable lens group comprises a fifth to seventh lens; the second variable lens group comprises an eighth to eleventh lens; the focusing lens group comprises a twelfth lens and a thirteenth lens; the second fixed lens group comprises a fourteenth lens; the first lens, the fifth lens, the sixth lens, the tenth lens and the thirteenth lens are negative power lenses; the second lens, the third lens, the fourth lens, the seventh lens, the eighth lens, the ninth lens, the eleventh lens and the twelfth lens are positive power lenses. By matching the lens groups and the optical power of the lenses in the five-group zoom lens, the imaging quality is improved.

Description

Technical Field

[0001] The present invention relates to the field of optical device technology, and in particular 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 becoming the mainstream sensors on the market and are being used more widely. However, traditional zoom lenses typically use 1 / 2.7” sensors, which are difficult to use in a wide range of environments. Furthermore, traditional zoom lenses suffer from low magnification and lack of infrared confocal focus. Therefore, it is essential to develop a high-quality zoom lens that is small in size, has high magnification, infrared confocal focus, and can be used with a 1 / 1.8” sensor. Summary of the Invention

[0004] This invention provides a zoom lens that enables a high-quality zoom lens design that can be used with a 1 / 1.8” chip.

[0005] This invention provides a zoom lens, comprising a first fixed lens group, a first zoom lens group, a second zoom lens group, a focusing lens group, and a second fixed lens group arranged sequentially along the optical axis from the object plane to the image plane; the optical power of the first fixed lens group, the second zoom lens group, and the focusing lens group are all positive, and the optical power of the first zoom lens group is negative.

[0006] The first fixed lens group includes a first lens, a second lens, a third lens, and a fourth lens arranged sequentially along the optical axis from the object plane to the image plane;

[0007] The first zoom lens group includes a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the optical axis from the object plane to the image plane;

[0008] The second zoom lens group includes an eighth lens, a ninth lens, a tenth lens, and an eleventh lens arranged sequentially along the optical axis from the object plane to the image plane;

[0009] The focusing lens group includes a twelfth lens and a thirteenth lens arranged sequentially from the object plane to the image plane along the optical axis;

[0010] The second fixed lens group includes a fourteenth lens;

[0011] The first lens, the fifth lens, the sixth lens, the tenth lens, and the thirteenth lens are all negative power lenses; the second lens, the third lens, the fourth lens, the seventh lens, the eighth lens, the ninth lens, the eleventh lens, and the twelfth lens are all positive power lenses.

[0012] Optionally, the fourteenth lens is a positive power lens, and the optical power of the second fixed lens group is positive;

[0013] Alternatively, the fourteenth lens may be a negative power lens, and the power of the second fixed lens group may be negative.

[0014] Optionally, the focal length of the first fixed lens group is F1q, the focal length of the first zoom lens group is F2q, the focal length of the second zoom lens group is F3q, the focal length of the focusing lens group is F4q, the focal length of the second fixed lens group is F5q, and the focal length of the zoom lens at the wide-angle end is FW.

[0015] Among them, 6.135≤F1q / FW≤6.369; -1.243≤F2q / FW≤-1.141; 2.782≤F3q / FW≤2.899; 3.117≤F4q / FW≤10.621; -8.894≤F5q / FW≤4.984.

[0016] Optionally, the first lens and the second lens are cemented together, and the ninth lens and the tenth lens are cemented together.

[0017] Optionally, the focal length of the ninth lens is f9, the focal length of the tenth lens is f10, the focal length of the cemented lens composed of the ninth lens and the tenth lens is f910, and the focal length of the second zoom lens group is f3q.

[0018] Among them, -0.964≤f9 / f910≤-0.793; -0.379≤f10 / f910≤-0.341; -0.973≤f910 / f3q≤-0.894.

[0019] Optionally, the first lens includes a first object-side surface near the object surface and a first image-side surface near the image surface, wherein the first object-side surface is convex and the first image-side surface is concave.

[0020] The second lens includes a second object-side surface near the object plane and a second image-side surface near the image plane, wherein the second object-side surface is convex and the second image-side surface is convex.

[0021] The third lens includes a third object-side surface near the object plane and a third image-side surface near the image plane. The third object-side surface is convex, and the third image-side surface is concave.

[0022] The fourth lens includes a fourth object-side surface near the object plane and a fourth image-side surface near the image plane. The fourth object-side surface is convex, and the fourth image-side surface is concave.

[0023] The fifth lens includes a fifth object-side surface near the object plane and a fifth image-side surface near the image plane. The fifth object-side surface is convex, and the fifth image-side surface is concave.

[0024] The sixth lens includes a sixth object-side surface near the object plane and a sixth image-side surface near the image plane. The sixth object-side surface is concave, and the sixth image-side surface is concave.

[0025] The seventh lens includes a seventh object-side surface near the object plane and a seventh image-side surface near the image plane. The seventh object-side surface is convex, and the seventh image-side surface is convex.

[0026] The eighth lens includes an eighth object-side surface near the object plane and an eighth image-side surface near the image plane. The eighth object-side surface is convex, and the eighth image-side surface is convex.

[0027] The ninth lens includes a ninth object-side surface near the object plane and a ninth image-side surface near the image plane. The ninth object-side surface is convex, and the ninth image-side surface is convex.

[0028] The tenth lens includes a tenth object-side surface near the object plane and a tenth image-side surface near the image plane. The tenth object-side surface is concave, and the tenth image-side surface is concave.

[0029] The eleventh lens includes an eleventh object-side surface near the object plane and an eleventh image-side surface near the image plane. The eleventh object-side surface is convex, and the eleventh image-side surface is concave.

[0030] The twelfth lens includes a twelfth image-side surface near the image plane, and the twelfth image-side surface is concave.

[0031] The thirteenth lens includes a thirteenth object-side surface near the object plane and a thirteenth image-side surface near the image plane. The center of the thirteenth object-side surface is convex, and the center of the thirteenth image-side surface is convex.

[0032] The fourteenth lens includes a fourteenth image side surface near the image plane, and the center of the fourteenth image side surface is convex.

[0033] Optionally, the maximum movable distance of the first zoom lens group is L1, the maximum movable distance of the second zoom lens group is L2, and the maximum optical assembly of the zoom lens is TL;

[0034] Among them, 4.02≤TL / L1≤4.07; 9.32≤TL / L2≤9.99.

[0035] Optionally, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, and the twelfth lens are all glass spherical lenses;

[0036] The sixth lens, the eleventh lens, the thirteenth lens, and the fourteenth lens are all glass aspherical lenses.

[0037] Optionally, the refractive index of the sixth lens is nd6 and the Abbe number is vd6; the refractive index of the eleventh lens is nd11 and the Abbe number is vd11; the refractive index of the thirteenth lens is nd13 and the Abbe number is vd13; and the refractive index of the fourteenth lens is nd14 and the Abbe number is vd14.

[0038] Among them, 1.439≤nd6≤1.498; 81.548≤vd6≤94.437;

[0039] 1.439≤nd11≤1.498; 81.548≤vd11≤94.437;

[0040] 1.439≤nd13≤1.591; 61.250≤vd13≤94.437;

[0041] 1.498≤nd14≤1.696;53.048≤vd14≤81.531;

[0042] Optionally, the first lens has a refractive index of nd1 and an Abbe number of vd1; the second lens has a refractive index of nd2 and an Abbe number of vd2; the third lens has a refractive index of nd3 and an Abbe number of vd3; and the fourth lens has a refractive index of nd4 and an Abbe number of vd4.

[0043] Wherein, 1.812≤nd1≤1.888; 33.286≤vd1≤37.185;

[0044] 1.438≤nd2≤1.498;81.607≤vd2≤95.122;

[0045] 1.438≤nd3≤1.498; 81.607≤vd3≤95.122;

[0046] 1.438≤nd4≤1.498;81.607≤vd4≤90.268;

[0047] Optionally, the refractive index of the seventh lens is nd7, and the Abbe number is vd7;

[0048] Among them, 1.958≤nd7≤2.119; 17.018≤vd7≤17.942.

[0049] Optionally, the zoom lens has a focal length of FT at the telephoto end and a focal length of FW at the wide-angle end;

[0050] Among them, FT / FW>18.

[0051] Optionally, the zoom lens has an aperture of FNOT at the telephoto end and an aperture of FNOW at the wide-angle end;

[0052] Where FNOT=3.5 and FNOW=1.6.

[0053] Optionally, the zoom lens may also include an aperture stop and a filter;

[0054] The aperture stop is disposed in the optical path between the first zoom lens group and the second zoom lens group;

[0055] The filter is disposed in the optical path between the second fixed lens group and the image plane.

[0056] The zoom lens provided by this invention has the following technical effects:

[0057] First, employing a three-moving-group and two-fixed-group lens configuration allows for better aberration correction during zooming. By moving the first zoom lens group, the second zoom lens group, and the focusing lens group along carefully calculated trajectories, aberrations at different focal lengths can be dynamically balanced and corrected. The movement of the second zoom lens group and the focusing lens group can specifically compensate for aberration changes caused by the movement of the first zoom lens group, ensuring sharp, low-distortion images at both wide-angle and telephoto ends.

[0058] Second, using the focusing lens group (rear group) for focusing, instead of moving the heavy front group, greatly improves the speed and efficiency of autofocus.

[0059] Third, the use of a positive optical power first fixed lens group and a negative optical power first zoom lens group at the front end of the optical system can compress the light beam, reduce the aperture and volume of all subsequent lens groups, ensure a larger light aperture after light passes through, and increase the aperture of the optical system to meet the needs of use under different conditions. Furthermore, the combination of the positive optical power first fixed lens group and the negative optical power first zoom lens group effectively cancels fundamental aberrations in the early stages of zooming; and the negative optical power of the first zoom lens group allows for more efficient changes in the system's focal length. Finally, the combination of the positive optical power first fixed lens group and the negative optical power first zoom lens group, in conjunction with the rear aperture stop, forms a near-to-telecentric structure, which can improve edge image quality.

[0060] IV. The optical system front end uses a combination of a second zoom lens group with positive optical power and a focusing lens group with positive optical power. This allows the first zoom lens group with negative optical power to work in conjunction with the second zoom lens group with positive optical power to form a Keplerian telescope structure (negative-positive combination). This structure can easily achieve extremely high zoom ratios; the zoom ratio provided in this embodiment of the invention can be 18X. Furthermore, the first zoom lens group with negative optical power produces negative distortion (barrel distortion) and positive field curvature, while the second zoom lens group with positive optical power produces positive distortion (pincushion distortion) and negative field curvature. Using them together before and after the aperture stop allows their distortions and field curvatures to cancel each other out and balance each other, providing consistent image quality throughout the zoom range. When the focusing lens group with positive optical power moves to focus, it typically increases the overall optical power of the system, effectively shortening the minimum focusing distance. The lens aberrations (such as spherical aberration and astigmatism) change very little, ensuring stable and excellent image quality performance throughout the entire focusing distance.

[0061] It should be understood that the description in this section is not intended to identify key or essential features of the invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0062] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0063] Figure 1 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention;

[0064] Figure 2 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention;

[0065] Figure 3This is a schematic diagram of the transverse chromatic aberration at the wide-angle end of the zoom lens provided in Embodiment 1 of the present invention;

[0066] Figure 4 This is a schematic diagram of axial aberration at the wide-angle end of the zoom lens provided in Embodiment 1 of the present invention;

[0067] Figure 5 This is a schematic diagram of the modulation transfer function curve of the zoom lens at the wide-angle end in visible light, provided in Embodiment 1 of the present invention.

[0068] Figure 6 This is a schematic diagram of the modulation transfer function curve of the zoom lens at the wide-angle end in the near-infrared band, as provided in Embodiment 1 of the present invention.

[0069] Figure 7 The vertical chromatic aberration curve of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention;

[0070] Figure 8 This is an axial aberration diagram of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention;

[0071] Figure 9 This is a schematic diagram of the modulation transfer function curve of the zoom lens at the telephoto end in visible light, provided in Embodiment 1 of the present invention.

[0072] Figure 10 This is a schematic diagram of the field of view VS modulation transfer function curve of the zoom lens at the telephoto end in the visible light band, as provided in Embodiment 1 of the present invention.

[0073] Figure 11 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention;

[0074] Figure 12 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention;

[0075] Figure 13 This is a schematic diagram of the transverse chromatic aberration at the wide-angle end of the zoom lens provided in Embodiment 2 of the present invention;

[0076] Figure 14 This is a schematic diagram of axial aberration at the wide-angle end of the zoom lens provided in Embodiment 2 of the present invention;

[0077] Figure 15 This is a schematic diagram of the modulation transfer function curve of the zoom lens at the wide-angle end in visible light, provided in Embodiment 2 of the present invention.

[0078] Figure 16 This is a schematic diagram of the modulation transfer function curve of the zoom lens at the wide-angle end in the near-infrared band, provided in Embodiment 2 of the present invention.

[0079] Figure 17This is the vertical chromatic aberration curve of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention;

[0080] Figure 18 This is an axial aberration diagram of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention;

[0081] Figure 19 This is a schematic diagram of the modulation transfer function curve of the zoom lens at the telephoto end in visible light, provided in Embodiment 2 of the present invention.

[0082] Figure 20 This is a schematic diagram of the field of view VS modulation transfer function curve of the zoom lens at the telephoto end in the visible light band, provided in Embodiment 2 of the present invention.

[0083] Figure 21 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention;

[0084] Figure 22 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention;

[0085] Figure 23 This is a schematic diagram of the transverse chromatic aberration at the wide-angle end of the zoom lens provided in Embodiment 3 of the present invention;

[0086] Figure 24 This is a schematic diagram of axial aberration at the wide-angle end of the zoom lens provided in Embodiment 3 of the present invention;

[0087] Figure 25 This is a schematic diagram of the modulation transfer function curve of the zoom lens at the wide-angle end in visible light, provided in Embodiment 3 of the present invention.

[0088] Figure 26 This is a schematic diagram of the modulation transfer function curve of the zoom lens at the wide-angle end in the near-infrared band, provided in Embodiment 3 of the present invention.

[0089] Figure 27 The vertical chromatic aberration curve of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention;

[0090] Figure 28 This is an axial aberration diagram of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention;

[0091] Figure 29 This is a schematic diagram of the modulation transfer function curve of the zoom lens at the telephoto end in visible light, provided in Embodiment 3 of the present invention.

[0092] Figure 30 This is a schematic diagram of the field of view VS modulation transfer function curve at the telephoto end of the zoom lens in the visible light band, as provided in Embodiment 3 of the present invention. Detailed Implementation

[0093] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0094] Example 1

[0095] 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 provided in Embodiment 1 of the present invention, as shown below. Figure 1 and Figure 2 As shown, the zoom lens provided in Embodiment 1 of the present invention includes a first fixed lens group S1, a first zoom lens group S2, a second zoom lens group S3, a focusing lens group S4, and a second fixed lens group S5 arranged sequentially along the optical axis from the object plane to the image plane; the optical power of the first fixed lens group S1, the second zoom lens group S3, and the focusing lens group S4 are all positive, while the optical power of the first zoom lens group S2 is negative; the first fixed lens group S1 includes a first lens 101, a second lens 102, a third lens 103, and a fourth lens 104 arranged sequentially along the optical axis from the object plane to the image plane; the first zoom lens group S2 includes a fifth lens 105, a sixth lens 106, and a seventh lens 107 arranged sequentially along the optical axis from the object plane to the image plane; the second zoom lens group S5... The lens group S3 includes an eighth lens 108, a ninth lens 109, a tenth lens 110, and an eleventh lens 111 arranged sequentially from the object plane to the image plane along the optical axis; the focusing lens group S4 includes a twelfth lens 112 and a thirteenth lens 113 arranged sequentially from the object plane to the image plane along the optical axis; the second fixed lens group S5 includes a fourteenth lens 114; wherein, the first lens 101, the fifth lens 105, the sixth lens 106, the tenth lens 110, and the thirteenth lens 113 are all negative power lenses; the second lens 102, the third lens 103, the fourth lens 104, the seventh lens 107, the eighth lens 108, the ninth lens 109, the eleventh lens 111, and the twelfth lens 112 are all positive power lenses.

[0096] Specifically, in this embodiment of the invention, the zoom lens includes a first fixed lens group S1, a first zoom lens group S2, a second zoom lens group S3, a diagonal lens group S4, and a second fixed lens group S5, which can be disposed within a single lens barrel. Figure 1 and Figure 2(Not shown in the image). The first fixed lens group S1 and the second fixed lens group S5 are fixed in position within the lens barrel. The first zoom lens group S2, the second zoom lens group S3, and the diagonal lens group S4 can reciprocate along the optical axis within the lens barrel. Through the movement of the first zoom lens group S2, the second zoom lens group S3, and the diagonal lens group S4, the focal length of the zoom lens can be continuously changed from wide-angle to telephoto, ensuring high image quality at all focal points.

[0097] It is understandable that during the zoom process achieved by moving the first zoom lens group S2, the second zoom lens group S3, and the diagonal lens group S4, 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, as well as different lengths or shapes.

[0098] Furthermore, optical power is equal to the difference between the convergence of the beam at the image plane and the convergence of the beam at the object plane, characterizing the zoom lens's ability to deflect light. The larger the absolute value of the optical power, the stronger the bending ability of light; the smaller the absolute value, the weaker the bending ability. When the optical power is positive, the refraction of light is converging; when the optical power is negative, the refraction of light is diverging. Optical power can be used to characterize a single refractive surface of a lens (i.e., a surface of the lens), a single lens, or a zoom lens (i.e., a lens group) formed by multiple lenses. In this embodiment of the invention, the zoom lens includes a first fixed lens group S1 with positive optical power, a first zoom lens group S2 with negative optical power, a second zoom lens group S3 with positive optical power, a diagonal lens group S4 with positive optical power, and a second fixed lens group S5. The use of a three-moving-group and two-fixed-group lens configuration allows for better phase correction during zooming. By moving the first zoom lens group S2, the second zoom lens group S3, and the focusing lens group S4 along a carefully calculated trajectory, aberrations at different focal lengths can be dynamically balanced and corrected. The movement of the second zoom lens group S3 and the focusing lens group S4 can specifically compensate for aberration changes caused by the movement of the first zoom lens group S2, ensuring sharp, low-distortion images at both wide-angle and telephoto ends. Furthermore, using the focusing lens group S4 (the rear group) for focusing, instead of moving the heavy front group, significantly improves the speed and efficiency of autofocus.

[0099] Furthermore, the use of a positive optical power first fixed lens group S1 and a negative optical power first zoom lens group S2 at the front end of the optical system can compress the light beam, reduce the aperture and volume of all subsequent lens groups, ensure a larger light aperture after light passes through, and increase the aperture of the optical system to meet the usage requirements under different conditions. In this embodiment of the invention, the aperture number of the zoom lens at the telephoto end is FNOT, and the aperture number at the wide-angle end is FNOW; where FNOT=3.5 and FNOW=1.6, meeting the requirements for a large aperture setting. Moreover, the combination of the positive optical power first fixed lens group S1 and the negative optical power first zoom lens group S2 effectively cancels fundamental aberrations in the early stages of zooming; and the negative optical power of the first zoom lens group S2 allows for more efficient changes in the system's focal length; finally, this combination of the positive optical power first fixed lens group S1 and the negative optical power first zoom lens group S2, in conjunction with the rear aperture stop, forms a near-to-telecentric structure, which can improve edge image quality.

[0100] Furthermore, the rear end of the aperture stop uses a second zoom lens group S3 with positive optical power and a focusing lens group S4 with positive optical power. This allows the first zoom lens group S2 with negative optical power to work with the second zoom lens group S3 with positive optical power to form a Kepler telescope structure (negative-positive combination). This structure can easily achieve an extremely high zoom ratio. In this embodiment of the invention, the focal length of the zoom lens at the telephoto end is FT, and the focal length at the wide-angle end is FW; where FT / FW>18, meaning the zoom ratio provided by this embodiment of the invention can reach 18X. The first zoom lens group S2 with negative optical power produces negative distortion (barrel distortion) and positive field curvature, while the second zoom lens group S3 with positive optical power produces positive distortion (pincushion distortion) and negative field curvature. Using them together before and after the aperture stop allows their distortions and field curvatures to cancel each other out and balance each other, providing consistent image quality throughout the entire zoom range. When the focusing lens group S4 with positive optical power moves to focus, it usually increases the optical power of the entire system, thereby effectively shortening the minimum focusing distance. The aberrations of the lens (such as spherical aberration and astigmatism) change very little, ensuring stable and excellent image quality performance throughout the entire focusing distance.

[0101] Furthermore, by adding a second fixed lens group S5 at the end of the zoom lens, which can have either positive or negative optical power, residual aberrations caused by the movement and coordination of the first four groups can be corrected. Additionally, the second fixed lens group S5 can effectively "calibrate" the light angle, ensuring that the principal rays (representing each image point) exit the lens at a near-perpendicular angle (perpendicular to the imaging sensor surface). For the imaging sensor, perpendicularly incident light can be more effectively collected by the microlenses, improving the signal-to-noise ratio and color accuracy.

[0102] Furthermore, the first fixed lens group S1 includes four lenses with optical powers of negative, positive, positive, and positive in sequence; the first zoom lens group S2 includes three lenses with optical powers of negative, negative, and positive in sequence; the second zoom lens group S3 includes four lenses with optical powers of positive, positive, negative, and positive in sequence; the focusing lens group S4 includes two lenses with optical powers of negative and positive in sequence; and the second fixed lens group S5 includes one lens. By combining the above-mentioned lenses with different optical powers, on the one hand, the role of each lens in its respective lens group can be defined, ensuring the mutual cooperation of the lenses in each lens group to realize the function of the lens group; on the other hand, based on ensuring that the lens has the defined optical power, the zoom function or compensation function of the zoom lens can be adjusted by the material and surface shape, thereby helping to improve the image quality of the zoom lens.

[0103] In summary, the zoom lens provided in this embodiment of the invention adopts a lens group configuration of three moving groups and two fixed groups. By reasonably setting the optical power matching of the lens groups and the optical power matching of multiple lenses in each lens group, it can correct aberrations, improve the speed and efficiency of autofocus, increase the aperture of the optical system, achieve an extremely high zoom ratio, and cancel and balance distortion and field curvature, ensuring stable and excellent image quality performance throughout the entire focusing distance.

[0104] Based on the above embodiments, continue to refer to Figure 1 and Figure 2 As shown, the zoom lens also includes an aperture stop STO and a filter 115; the aperture stop STO is disposed in the optical path between the first zoom lens group S2 and the second zoom lens group S3; the filter 115 is disposed in the optical path between the second fixed lens group S5 and the image plane.

[0105] Specifically, by setting the aperture stop STO, the propagation direction of the light beam can be adjusted, which is beneficial to improving image quality. Furthermore, in this zoom lens, the aperture stop STO can be located in the optical path between the first zoom lens group S2 and the second zoom lens group S3. The purpose is to control the higher aberrations of the lens at the front end, ensuring good image quality while improving image height and expanding the target area at the rear end of the lens. Further, the filter 115 is disposed in the optical path between the second fixed lens group S5 and the image plane. The filter 115 can filter out interference light, improving the imaging effect of the zoom lens. Further, the zoom lens provided in this embodiment of the invention may also include a protective glass and an imaging sensor. The protective glass can be disposed on the image side of the filter, and the imaging sensor can be disposed on the image side of the protective glass. The optical system is protected by the protective glass, and the image is acquired by the imaging sensor, enabling the optical system to perform its normal imaging function.

[0106] Based on the above embodiments, the fourteenth lens 114 is a positive optical power lens, and the optical power of the second fixed lens group S5 is positive; or, the fourteenth lens 114 is a negative optical power lens, and the optical power of the second fixed lens group S5 is negative.

[0107] Specifically, a fixed lens group S5 with a variable optical power (positive or negative) is added at the end of the optical system to correct residual aberrations caused by the movement and coordination of the preceding four lens groups. Depending on the sign of the aberration, the second fixed lens group S5 can be corrected using a variable optical power. Furthermore, it can effectively "calibrate" the light angle, ensuring that the principal ray (representing each image point) exits the lens at a near-perpendicular angle (perpendicular to the imaging sensor surface). For the imaging sensor, perpendicularly incident light can be more effectively collected by the microlenses, improving the signal-to-noise ratio and color accuracy.

[0108] Based on the above embodiment, the focal length of the first fixed lens group S1 is F1q, the focal length of the first zoom lens group S2 is F2q, the focal length of the second zoom lens group S3 is F3q, the focal length of the focusing lens group S4 is F4q, the focal length of the second fixed lens group S5 is F5q, and the focal length of the zoom lens at the wide-angle end is FW; wherein, 6.135≤F1q / FW≤6.369; -1.243≤F2q / FW≤-1.141; 2.782≤F3q / FW≤2.899; 3.117≤F4q / FW≤10.621; -8.894≤F5q / FW≤4.984. Using this lens configuration achieves a reasonable combination of optical power, allowing light to pass through the lens more smoothly and significantly correcting the impact of advanced aberrations on image quality.

[0109] Based on the above embodiments, the first lens 101 and the second lens 102 are cemented together, and the ninth lens 109 and the tenth lens 110 are cemented together.

[0110] Specifically, the cemented joint of the first lens 101 and the second lens 102 can be understood as the surface of the first lens 101 near the image side being bonded to the surface of the second lens 102 near the object side, that is, the image-side surface of the first lens 101 being bonded to the object-side surface of the second lens 102. Similarly, the cemented joint of the ninth lens 109 and the tenth lens 110 can be understood as the surface of the ninth lens 109 near the image side being bonded to the surface of the tenth lens 110 near the object side, that is, the image-side surface of the ninth lens 109 being bonded to the object-side surface of the tenth lens 110. By cementing the first lens 101 and the second lens 102, the air gap between them can be reduced; similarly, by cementing the ninth lens 109 and the tenth lens 110, the air gap between them can be reduced. Both arrangements contribute to reducing the overall optical length of the lens and also reduce tolerance sensitivity issues such as tilt / eccentricity during lens assembly, simplifying the assembly process in lens manufacturing and improving equipment efficiency. Simultaneously, the cemented arrangement of the first lens 101 and the second lens 102, as well as the cemented arrangement of the ninth lens 109 and the tenth lens 110, can reduce light loss caused by inter-lens reflection, improve illumination, and significantly suppress ghosting and flare, especially in high-contrast environments such as backlighting, resulting in cleaner, higher-contrast images. Furthermore, cemented lenses can be used to minimize or eliminate chromatic aberration. Using cemented lenses in zoom lenses can improve image quality and reduce light energy reflection loss, thereby improving image quality and enhancing the sharpness of the lens image. Furthermore, the cementing arrangement between the first lens 101 and the second lens 102, and between the ninth lens 109 and the tenth lens 110, can be achieved through spacer support or adhesive bonding; the specific bonding method is not limited in this embodiment of the invention.

[0111] Based on the above embodiments, the focal length of the ninth lens 109 is f9, the focal length of the tenth lens 110 is f10, the focal length of the cemented lens composed of the ninth lens 109 and the tenth lens 110 is f910, and the focal length of the second zoom lens group S3 is f3q; wherein, -0.964≤f9 / f910≤-0.793; -0.379≤f10 / f910≤-0.341; -0.973≤f910 / f3q≤-0.894.

[0112] Specifically, during the zooming process of the optical system, the second zoom lens group S3 is responsible for compensating for the zoom of the optical system when the focal length changes. By using cemented lenses and reasonably setting the relationship between the focal lengths of the lenses in the cemented lens group and the focal lengths of the cemented lenses, as well as the correspondence between the focal lengths of the cemented lenses and the second zoom lens group S3, chromatic aberration and higher aberrations generated in the first zoom lens group S2 can be corrected, significantly reducing the aberration pressure of other lens groups at different focal lengths, thereby enabling the optical system to focus across the entire focal length range.

[0113] Based on the above embodiments, the first lens 101 includes a first object-side surface near the object plane and a first image-side surface near the image plane, the first object-side surface being convex and the first image-side surface being concave; the second lens 102 includes a second object-side surface near the object plane and a second image-side surface near the image plane, the second object-side surface being convex and the second image-side surface being convex; the third lens 103 includes a third object-side surface near the object plane and a third image-side surface near the image plane, the third object-side surface being convex and the third image-side surface being concave; the fourth lens 104 includes a third object-side surface near the object plane and a third image-side surface near the image plane. The fourth object-side surface on one side and the fourth image-side surface on the side closer to the image plane, the fourth object-side surface being convex and the fourth image-side surface being concave; the fifth lens 105 includes a fifth object-side surface on the side closer to the object plane and a fifth image-side surface on the side closer to the image plane, the fifth object-side surface being convex and the fifth image-side surface being concave; the sixth lens 106 includes a sixth object-side surface on the side closer to the object plane and a sixth image-side surface on the side closer to the image plane, the sixth object-side surface being concave and the sixth image-side surface being concave; the seventh lens 107 includes a seventh object-side surface on the side closer to the object plane and a seventh image-side surface on the side closer to the image plane, the seventh... The object-side surface is convex, and the seventh image-side surface is convex; the eighth lens 108 includes an eighth object-side surface near the object surface and an eighth image-side surface near the image surface, both of which are convex; the ninth lens 109 includes a ninth object-side surface near the object surface and a ninth image-side surface near the image surface, both of which are convex; the tenth lens 110 includes a tenth object-side surface near the object surface and a tenth image-side surface near the image surface, both of which are concave; the eleventh lens 111 The eleventh object-side surface and the eleventh image-side surface are included, with the eleventh object-side surface being convex and the eleventh image-side surface being concave. The twelfth lens 112 includes the twelfth image-side surface near the image plane, which is concave. The thirteenth lens 113 includes the thirteenth object-side surface and the thirteenth image-side surface near the image plane, with the center of the thirteenth object-side surface and the center of the thirteenth image-side surface being convex. The fourteenth lens 114 includes the fourteenth image-side surface near the image plane, with the center of the fourteenth image-side surface being convex.

[0114] Specifically, the object-side surface of a lens can be understood as the surface of the lens closest to the object plane, and the image-side surface of a lens can be understood as the surface of the lens closest to the image plane. The first object-side surface is convex, and the first image-side surface is concave. That is, the object-side surface of the first lens 101 convexes towards the object plane near the optical axis, and the image-side surface is concave towards the image plane near the optical axis. In other words, the first lens 101 is a lens with a convex-concave structure.

[0115] The second object-side surface is convex, and the second image-side surface is convex. That is, the object-side surface of the second lens 102 convexes towards the object surface near the optical axis, and the image-side surface convexes towards the image surface near the optical axis. In other words, the second lens 102 is a lens with a biconvex structure.

[0116] The third object side is convex, and the third image side is concave. That is, the object side of the third lens 103 is convex towards the object surface near the optical axis, and the image side is concave towards the image surface near the optical axis. In other words, the third lens 103 is a lens with a convex-concave structure.

[0117] The fourth object-side surface is convex, and the fourth image-side surface is concave. That is, the object-side surface of the fourth lens 104 is convex towards the object surface near the optical axis, and the image-side surface is concave towards the image surface near the optical axis. In other words, the fourth lens 104 is a lens with a convex-concave structure.

[0118] The fifth object-side surface is convex, and the fifth image-side surface is concave. That is, the object-side surface of the fifth lens 105 is convex towards the object surface near the optical axis, and the image-side surface is concave towards the image surface near the optical axis. In other words, the fifth lens 105 is a lens with a convex-concave structure.

[0119] The sixth object-side surface is concave, and the sixth image-side surface is concave. That is, the object-side surface of the sixth lens 106 is concave towards the object surface at the position near the optical axis, and the image-side surface is concave towards the image surface at the position near the optical axis. In other words, the sixth lens 106 is a lens with a double concave structure.

[0120] The seventh object-side surface is convex, and the seventh image-side surface is also convex. That is, the object-side surface of the seventh lens 107 convexes towards the object surface near the optical axis, and the image-side surface convexes towards the image surface near the optical axis. In other words, the seventh lens 107 is a lens with a biconvex structure.

[0121] The eighth image side is convex, meaning that the object side of the eighth lens 108 convexes towards the object plane near the optical axis, and the image side convexes towards the image plane near the optical axis. In other words, the eighth lens 108 is a biconvex lens.

[0122] The ninth object-side surface is convex, and the ninth image-side surface is also convex. That is, the object-side surface of the ninth lens 109 convexes towards the object surface near the optical axis, and the image-side surface convexes towards the image surface near the optical axis. In other words, the ninth lens 109 is a lens with a biconvex structure.

[0123] The tenth object-side surface is concave, and the tenth image-side surface is also concave. That is, the object-side surface of the tenth lens 110 is concave towards the object surface at the position near the optical axis, and the image-side surface is concave towards the image surface at the position near the optical axis. In other words, the tenth lens 110 is a lens with a double concave structure.

[0124] The eleventh object-side surface is convex, and the eleventh image-side surface is concave. That is, the object-side surface of the eleventh lens 111 is convex towards the object surface near the optical axis, and the image-side surface is concave towards the image surface near the optical axis. In other words, the eleventh lens 111 is a lens with a convex-concave structure.

[0125] The twelfth image side is concave, meaning that the image side of the twelfth lens 112 is concave towards the image plane at the position near the optical axis, which means that the twelfth lens 112 is a lens with a concave image plane structure.

[0126] The center of the thirteenth object side is convex, and the center of the thirteenth image side is convex. That is, the object side of the thirteenth lens 113 convexes towards the object plane near the optical axis, and the image side convexes towards the image plane near the optical axis. In other words, the thirteenth lens 113 is a lens with a central biconvex structure.

[0127] The fourteenth image side is convex, meaning that the image side of the fourteenth lens 114 convexes towards the image plane at the position near the optical axis. In other words, the fourteenth lens 114 is a lens with a convex structure at the center of the image plane.

[0128] By designing the surface shape of each lens and combining the optical power of each lens, the imaging effect of the zoom lens and the overall size of the optical lens can be further adjusted.

[0129] Based on the above embodiments, the maximum movable distance of the first zoom lens group S2 is L1, the maximum movable distance of the second zoom lens group S3 is L2, and the maximum optical assembly of the zoom lens is TL.

[0130] Wherein, 4.02≤TL / L1≤4.07; 9.32≤TL / L2≤9.99. By controlling the moving distance of the first zoom lens group S2 and the second zoom lens group S3, the size of the zoom lens is minimized to the greatest extent. The smaller this value, the longer the zoom group travel. According to the above limitations, the first zoom lens group S2 has a long travel and will be used as the main zoom group. Using the negative optical power first zoom lens group S2 as the main zoom group can increase the lens magnification. In addition, limiting the length of the first zoom lens group S2 and the total length of the lens, as well as the length of the second zoom lens group S3 and the total length of the lens, can compress the lens space, ensuring that the required image quality and zoom level are met while maintaining a small lens size.

[0131] Based on the above embodiments, the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105, the seventh lens 107, the eighth lens 108, the ninth lens 109, the tenth lens 110, and the twelfth lens 112 are all glass spherical lenses; the sixth lens 106, the eleventh lens 111, the thirteenth lens 113, and the fourteenth lens 114 are all glass aspherical lenses.

[0132] Specifically, spherical lenses are characterized by a constant curvature from the center to the periphery, ensuring a simple lens configuration. Furthermore, due to the low coefficient of thermal expansion and good stability of glass lenses, it is possible to design the first lens 101, second lens 102, third lens 103, fourth lens 104, fifth lens 105, seventh lens 107, eighth lens 108, ninth lens 109, tenth lens 110, and twelfth lens 112 as glass spherical lenses. The thermal properties of glass spherical lenses are more stable, ensuring good resolving power over a wide temperature range when handling higher optical powers. In addition, compared to plastic aspherical lenses, glass offers a wider range of material choices, with more freedom in selecting refractive index and Abbe number. This allows for better control over higher aberrations and chromatic aberrations, meeting the needs of use under complex conditions.

[0133] Aspherical lenses are characterized by a continuous change in curvature from the center to the periphery, unlike spherical lenses which have a constant curvature. Aspherical lenses offer superior curvature radius characteristics, improving distortion and astigmatism. Based on this, both the first zoom lens group S2 and the second zoom lens group S3 utilize an aspherical lens; specifically, the sixth lens 106 and the eleventh lens 111 are both aspherical lenses. This eliminates spherical aberration, corrects coma, astigmatism, off-axis aberration, and distortion, improving edge image quality and maintaining consistent high sharpness from the center to the edges. Furthermore, during zooming, the second zoom lens group S3 compensates for changes in focal length. Using aspherical lenses corrects chromatic aberration and higher-order aberrations generated in the first zoom lens group S2, significantly reducing aberration pressure on other lens groups at different focal lengths, thus enabling the optical system to focus across the entire focal length range. Furthermore, compared to traditional zoom lens groups that require multiple lenses to correct aberrations, this embodiment of the invention uses a single glass aspherical lens, namely the thirteenth lens 113, in the focusing lens group S4. This can correct multiple aberrations, greatly improving space utilization, reducing the weight of the focusing lens group S4, and making the focusing process more stable. Furthermore, the second fixed lens group S5 uses a glass aspherical lens, meaning the fourteenth lens 114 uses a glass aspherical lens. This can "flatten" the curved image plane formed by the entire optical system, allowing it to perfectly fit onto the flat imaging sensor, achieving simultaneous clear focus on the entire image. Additionally, it can reduce the CRA (chief ray angle), effectively improving image quality and compatibility with most 1 / 1.8” chips on the market.

[0134] Furthermore, in this embodiment of the invention, the aspherical lens of the zoom optical system satisfies the following formula:

[0135]

[0136] Where Z is the axial distance from the vertex of the surface at a position perpendicular to the optical axis at a height r along the optical axis; c represents the curvature at the vertex of the aspherical surface; a4, a6, a8, a10, a12, a14, a16, a18, and a20 are the fourth, sixth, eighth, tenth, twelfth, fourteenth, sixteenth, eighteenth, and twentieth order higher-order aspherical coefficients corresponding to the aspherical surfaces. These can be combined to form higher-order terms for the corresponding aspherical surfaces.

[0137] Based on the above embodiments, the refractive index of the sixth lens 106 is nd6 and the Abbe number is vd6; the refractive index of the eleventh lens 111 is nd11 and the Abbe number is vd11; the refractive index of the thirteenth lens 113 is nd13 and the Abbe number is vd13; the refractive index of the fourteenth lens 114 is nd14 and the Abbe number is vd14; wherein, 1.439≤nd6≤1.498; 81.548≤vd6≤94.437; 1.439≤nd11≤1.498; 81.548≤vd11≤94.437; 1.439≤nd13≤1.591; 61.250≤vd13≤94.437; 1.498≤nd14≤1.696; 53.048≤vd14≤81.531.

[0138] The first zoom lens group S2 and the second zoom lens group S3 each use a high Abbe number aspherical lens. That is, the sixth lens 106 and the eleventh lens 111 are both high Abbe number aspherical lenses. A high Abbe number means low chromatic dispersion. Placing high Abbe number lenses in the zoom lens group can effectively correct axial chromatic aberration (different focal points for different colors of light) and magnification chromatic aberration (different image sizes for different colors of light, resulting in purple fringing). This directly improves the color purity and edge sharpness of the image. Furthermore, the thirteenth lens 113, with its glass aspherical lens configuration combined with its refractive index and Abbe number, further corrects various aberrations and improves space utilization. The fourteenth lens 114, with its glass aspherical lens configuration combined with its refractive index and Abbe number, further "flattens" the curved image plane formed by the entire optical system, allowing it to perfectly fit the flat sensor, achieving simultaneous sharp focus across the entire image.

[0139] Based on the above embodiments, the refractive index of the first lens 101 is nd1, and the Abbe number is vd1; the refractive index of the second lens 102 is nd2, and the Abbe number is vd2; the refractive index of the third lens 103 is nd3, and the Abbe number is vd3; the refractive index of the fourth lens 104 is nd4, and the Abbe number is vd4; wherein, 1.812≤nd1≤1.888; 33.286≤vd1≤37.185; 1.438≤nd2≤1.498; 81.607≤vd2≤95.122; 1.438≤nd3≤1.498; 81.607≤vd3≤95.122; 1.438≤nd4≤1.498; 81.607≤vd4≤90.268.

[0140] Specifically, to ensure stable imaging across the entire zoom optical system, it is typically necessary to separately purify and control chromatic aberration in the fixed lens group. This prevents excessive accumulation of chromatic and aberration after entering the moving lens group, which would negatively impact image quality. For the first fixed lens group S1, high-magnification lenses produce significant chromatic aberration at the telephoto end. To eliminate chromatic aberration, the second lens 102, third lens 103, and fourth lens 1044 use high Abbe number materials to purify chromatic aberration after light enters the first zoom lens group S2, thus reducing the influence of the first zoom lens group S2 on its chromatic aberration.

[0141] According to the achromatic conditions of cemented doublets, a cemented doublet with a certain optical power can only achieve achromatic aberration when using two different types of glass (the Abbe number of the front lens of the cemented doublet is not equal to the Abbe number of the rear lens). Furthermore, to minimize the difference in optical power between the front and rear lenses, the difference in Abbe constants between the two types of glass should be as large as possible. Typically, two different types of glass are chosen, such as crown glass and flint glass. The former has a large Abbe number, while the latter has a small Abbe number. Therefore, in the cemented doublet composed of the first lens 101 and the second lens 102, using a combination with a large difference in Abbe numbers can further eliminate chromatic aberration in the optical system, thereby enabling the optical system to achieve full-band confocal focusing in the 436nm-870nm wavelength range at the wide-angle end.

[0142] Based on the above embodiment, the refractive index of the seventh lens 107 is nd7, and the Abbe number is vd7; wherein, 1.958≤nd7≤2.119; 17.018≤vd7≤17.942. Using a high refractive index lens at the end of the first zoom lens group S2 allows for more precise control of the angle and diameter of light rays incident on subsequent lens groups, enabling the light rays to exit the first zoom lens group S2 at a more "gentle" and "regular" angle and enter the subsequent second zoom lens group S3. This greatly reduces the pressure on the second zoom lens group S3 to correct off-axis aberrations (such as coma and astigmatism), ensuring the overall imaging quality of the optical system.

[0143] As one implementation method, the parameters of each lens in the zoom lens will be explained below.

[0144] Table 1. Optical design values ​​for the zoom lens in Example 1

[0145]

[0146] Table 2 Design values ​​of optical physical parameters for a zoom lens

[0147]

[0148] Table 3. Zoom intervals at the wide-angle and telephoto ends of a zoom optical system.

[0149]

[0150] The surface numbers in Table 2 above are assigned according to the surface sequence of each lens. "STO" represents the aperture stop of the lens; IMA represents the image plane; the radius of curvature represents the curvature of the corresponding lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane. "INF" indicates that the surface is flat and the radius of curvature is infinite; thickness represents the central axial distance between the current surface and the next surface; refractive index represents the ability of the material between the current surface and the next surface to deflect light; a blank space indicates that the current position is air and the refractive index is 1. The zoom intervals in Table 3 are the different interval values ​​for the lens at the wide-angle and telephoto ends.

[0151] Table 4 below shows the aspheric coefficient values ​​used in the current embodiment; Table 5 shows some specific parameters implemented in this embodiment.

[0152] Table 4 Design values ​​of aspherical conic coefficient in a zoom lens

[0153]

[0154] "-1.681281499E-03" means -1.681281499 × 10 -3 All other coefficients are represented in this way.

[0155] Table 5 Specific parameters for this embodiment

[0156]

[0157] Furthermore, Figure 3 This is a schematic diagram of the transverse chromatic aberration of the zoom lens at the wide-angle end according to Embodiment 1 of the present invention, as shown below. Figure 3 As shown, the vertical axis represents the field of view, 0 indicates being on the optical axis, and the vertex of the vertical axis represents the maximum image height; the dominant wavelength is 546 nm, and the horizontal axis represents the offset relative to the dominant wavelength, in micrometers (μm). Figure 3 It can be seen that the transverse chromatic aberration of different wavelengths is controlled within a small range, indicating that the transverse chromatic aberration of the zoom optical system is well controlled at the wide-angle end, which can meet the application requirements under normal conditions.

[0158] Figure 4 This is a schematic diagram of the axial aberration of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention, as shown below. Figure 4 As shown, the vertical direction represents the normalized aperture, with 0 indicating the optical axis, and the vertical vertex representing the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focal point, in millimeters (mm). Different linear curves in the figure represent different wavelengths of system imaging, determined by... Figure 4 It can be seen that the axial aberrations of the normalized aperture at different wavelengths are all controlled within the range of (-0.02mm, +0.04mm), indicating that the spherical aberration of the optical system is well controlled at each wavelength; it can meet the requirements of wide spectrum applications.

[0159] Figure 5 This is a schematic diagram of the modulation transfer function curve of the zoom lens at the wide-angle end in visible light according to Embodiment 1 of the present invention. The vertical axis represents the modulation transfer function value, unit: none; the horizontal axis represents the spatial frequency, unit: cyc / mm (line pairs / mm). The simulated visible light band range is 436nm~656nm, with a dominant wavelength of 546nm. Figure 5 It can be seen that the modulation transfer function values ​​of each frequency under different fields of view are all controlled within a reasonable range. Among them, at 120 line pairs / mm, the modulation transfer function value within 1 field of view is greater than 0.35, indicating that the image quality of the zoom optical system is well controlled at the wide-angle end, which meets the requirements of 4K camera use.

[0160] Figure 6 This is a schematic diagram of the modulation transfer function (MTF) curve of the zoom lens in the near-infrared band at the wide-angle end, as provided in Embodiment 1 of the present invention. The vertical axis represents the MTF value, unit: none; the horizontal axis represents the spatial frequency, unit: cyc / mm (line pairs / mm). The simulated infrared band range is 830nm~870nm, with a dominant wavelength of 850nm. Figure 6 It can be seen that the modulation transfer function values ​​of each frequency under different fields of view are all controlled within a reasonable range. Among them, at 60 line pairs / mm, the modulation transfer function value within 1 field of view is greater than 0.35, indicating that the image quality of the zoom optical system is well controlled at the wide-angle end, which meets the requirements of 4K camera use.

[0161] Figure 7 This is the transverse chromatic aberration curve at the telephoto end of the zoom lens provided in Embodiment 1 of the present invention. The vertical axis represents the field of view, 0 indicates that it is on the optical axis, and the vertex of the vertical axis represents the maximum image height; the dominant wavelength is 546nm, and the horizontal axis represents the offset relative to the dominant wavelength, in micrometers (μm). Figure 7 It can be seen that the transverse chromatic aberration of different wavelengths is controlled within a small range, indicating that the transverse chromatic aberration of the zoom optical system is well controlled at the telephoto end, which can meet the application requirements under normal conditions.

[0162] Figure 8 This is an axial aberration diagram of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention. The vertical direction represents the normalized aperture, with 0 indicating the optical axis and the vertical vertex representing the maximum pupil radius. The horizontal direction represents the offset relative to the ideal focus, in millimeters (mm). Different linear curves in the diagram represent different wavelengths of the system imaging, determined by... Figure 8It can be seen that the axial aberrations of the normalized apertures of different wavelengths from 0 to 1.0 are all controlled within the range of (-0.04 mm, +0.06 mm), indicating that the spherical aberration of the optical system is well controlled at each wavelength; it can meet the requirements of wide spectrum applications.

[0163] Figure 9 This is a schematic diagram of the modulation transfer function (MTF) curve of the zoom lens at the telephoto end in visible light, provided in Embodiment 1 of the present invention. The vertical axis represents the MTF value, unit: none; the horizontal axis represents the spatial frequency, unit: cyc / mm (line pairs / mm). The simulated visible light band range is 436nm~656nm, with a dominant wavelength of 546nm. Figure 9 It can be seen that the modulation transfer function values ​​of each frequency under different fields of view are all controlled within a reasonable range. Among them, at 120 line pairs / mm, the modulation transfer function value within 1 field of view is greater than 0.35, indicating that the image quality of the zoom optical system is well controlled at the wide-angle end, which meets the requirements of 4K camera use.

[0164] Figure 10 This is a schematic diagram of the field of view vs. modulation transfer function curve at the telephoto end of the zoom lens provided in Embodiment 1 of the present invention in the visible light band. The vertical axis represents the modulation transfer function value, unit: none; the horizontal axis represents the image height, unit: mm. The simulated visible light band range is 436nm~656nm, with a dominant wavelength of 546nm. Figure 10 It can be seen that the modulation transfer function (MTF) values ​​at various frequencies under different fields of view are all controlled within a reasonable range. Specifically, at 120 line pairs / mm, the MTF values ​​within 1 field of view are all greater than 0.35, and the MTF changes relatively smoothly with the field of view, indicating that the image quality changes are relatively uniform. This demonstrates that the zoom optical system achieves good image quality control at the wide-angle end, meeting the requirements for 4K cameras.

[0165] In summary, the zoom lens provided in Embodiment 1 of the present invention uses 14 lens elements and a certain thickness of flat glass to achieve full-band confocal focusing (wide-angle end) and 18X zoom in the 436nm-870nm band under a 1 / 1.8″ target surface, with higher image quality and suitable for more usage needs.

[0166] Example 2

[0167] Figure 11 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention. Figure 12 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention, as shown below. Figure 11 and Figure 12As shown, the zoom lens provided in Embodiment 2 of the present invention includes a first fixed lens group S1, a first zoom lens group S2, a second zoom lens group S3, a focusing lens group S4, and a second fixed lens group S5 arranged sequentially along the optical axis from the object plane to the image plane; the optical power of the first fixed lens group S1, the second zoom lens group S3, and the focusing lens group S4 are all positive, while the optical power of the first zoom lens group S2 is negative; the first fixed lens group S1 includes a first lens 101, a second lens 102, a third lens 103, and a fourth lens 104 arranged sequentially along the optical axis from the object plane to the image plane; the first zoom lens group S2 includes a fifth lens 105, a sixth lens 106, and a seventh lens 107 arranged sequentially along the optical axis from the object plane to the image plane; the second zoom lens group S5... The lens group S3 includes an eighth lens 108, a ninth lens 109, a tenth lens 110, and an eleventh lens 111 arranged sequentially from the object plane to the image plane along the optical axis; the focusing lens group S4 includes a twelfth lens 112 and a thirteenth lens 113 arranged sequentially from the object plane to the image plane along the optical axis; the second fixed lens group S5 includes a fourteenth lens 114; wherein, the first lens 101, the fifth lens 105, the sixth lens 106, the tenth lens 110, and the thirteenth lens 113 are all negative power lenses; the second lens 102, the third lens 103, the fourth lens 104, the seventh lens 107, the eighth lens 108, the ninth lens 109, the eleventh lens 111, and the twelfth lens 112 are all positive power lenses.

[0168] The lens setup is the same as in Embodiment 1, and will not be repeated here.

[0169] As another feasible implementation method, the specific parameters of the zoom lens are explained below.

[0170] Table 6. Optical design values ​​for the zoom lens in Example 2

[0171]

[0172] Table 7 Design values ​​of optical physical parameters for a zoom lens

[0173]

[0174] Table 8. Zoom intervals at the wide-angle and telephoto ends of a zoom optical system.

[0175]

[0176] The surface numbers in Table 7 above are assigned according to the surface sequence of each lens. "STO" represents the aperture stop of the lens; IMA represents the image plane; the radius of curvature represents the curvature of the corresponding lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane. "INF" indicates that the surface is flat and the radius of curvature is infinite; thickness represents the central axial distance between the current surface and the next surface; refractive index represents the ability of the material between the current surface and the next surface to deflect light; a blank space indicates that the current position is air and the refractive index is 1. The zoom intervals in Table 8 are the different interval values ​​for the lens at the wide-angle and telephoto ends.

[0177] Table 9 below shows the aspheric coefficient values ​​used in the current embodiment; Table 10 shows some specific parameters implemented in this embodiment.

[0178] Table 9 Design values ​​of aspherical conic coefficient in a zoom lens

[0179]

[0180] "-1.531541143E-03" means -1.531541143 × 10 -3 All other coefficients are represented in this way.

[0181] Table 10 Specific parameters for this embodiment

[0182]

[0183] Furthermore, Figure 13 This is a schematic diagram of the transverse chromatic aberration of the zoom lens at the wide-angle end according to Embodiment 2 of the present invention, as shown below. Figure 13 As shown, the vertical axis represents the field of view, 0 indicates being on the optical axis, and the vertex of the vertical axis represents the maximum image height; the dominant wavelength is 546 nm, and the horizontal axis represents the offset relative to the dominant wavelength, in micrometers (μm). Figure 13 It can be seen that the transverse chromatic aberration of different wavelengths is controlled within a small range, indicating that the transverse chromatic aberration of the zoom optical system is well controlled at the wide-angle end, which can meet the application requirements under normal conditions.

[0184] Figure 14 This is a schematic diagram of the axial aberration at the wide-angle end of the zoom lens provided in Embodiment 2 of the present invention, as shown below. Figure 14 As shown, the vertical direction represents the normalized aperture, with 0 indicating the optical axis, and the vertical vertex representing the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focal point, in millimeters (mm). Different linear curves in the figure represent different wavelengths of system imaging, determined by... Figure 14It can be seen that the axial aberrations of the normalized aperture at different wavelengths are all controlled within the range of (-0.02mm, +0.025mm), indicating that the spherical aberration of the optical system is well controlled at each wavelength; it can meet the requirements of wide spectrum applications.

[0185] Figure 15 This is a schematic diagram of the modulation transfer function curve of the zoom lens at the wide-angle end in visible light according to Embodiment 2 of the present invention. The vertical axis represents the modulation transfer function value, unit: none; the horizontal axis represents the spatial frequency, unit: cyc / mm (line pairs / mm). The simulated visible light band range is 436nm~656nm, with a dominant wavelength of 546nm. Figure 15 It can be seen that the modulation transfer function values ​​of each frequency under different fields of view are all controlled within a reasonable range. Among them, at 120 line pairs / mm, the modulation transfer function value within 1 field of view is greater than 0.35, indicating that the image quality of the zoom optical system is well controlled at the wide-angle end, which meets the requirements of 4K camera use.

[0186] Figure 16 This is a schematic diagram of the modulation transfer function (MTF) curve of the zoom lens in the near-infrared band at the wide-angle end, as provided in Embodiment 2 of the present invention. The vertical axis represents the MTF value (unit: none); the horizontal axis represents the spatial frequency (unit: cyc / mm (line pairs / mm)). The simulated infrared band range is 830nm~870nm, with a dominant wavelength of 850nm. Figure 16 It can be seen that the modulation transfer function values ​​of each frequency under different fields of view are all controlled within a reasonable range. Among them, at 60 line pairs / mm, the modulation transfer function value within 1 field of view is greater than 0.5, indicating that the image quality of the zoom optical system is well controlled at the wide-angle end, which meets the requirements of 4K camera use.

[0187] Figure 17 This is the transverse chromatic aberration curve at the telephoto end of the zoom lens provided in Embodiment 2 of the present invention. The vertical axis represents the field of view, 0 indicates that it is on the optical axis, and the vertex of the vertical axis represents the maximum image height; the dominant wavelength is 546nm, and the horizontal axis represents the offset relative to the dominant wavelength, in micrometers (μm). Figure 17 It can be seen that the transverse chromatic aberration of different wavelengths is controlled within a small range, indicating that the transverse chromatic aberration of the zoom optical system is well controlled at the telephoto end, which can meet the application requirements under normal conditions.

[0188] Figure 18 This is an axial aberration diagram of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention. The vertical direction represents the normalized aperture, 0 indicates it is on the optical axis, and the vertical vertex represents the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus, in millimeters (mm). Different linear curves in the diagram represent different wavelengths of the system imaging, determined by... Figure 18It can be seen that the axial aberrations of the normalized apertures of different wavelengths from 0 to 1.0 are all controlled within the range of (-0.03 mm, +0.1 mm), indicating that the spherical aberration of the optical system is well controlled at each wavelength; it can meet the requirements of wide spectrum applications.

[0189] Figure 19 This is a schematic diagram of the modulation transfer function (MTF) curve of the zoom lens at the telephoto end in visible light, provided in Embodiment 2 of the present invention. The vertical axis represents the MTF value, unit: none; the horizontal axis represents the spatial frequency, unit: cyc / mm (line pairs / mm). The simulated visible light band range is 436nm~656nm, with a dominant wavelength of 546nm. Figure 19 It can be seen that the modulation transfer function values ​​of each frequency under different fields of view are all controlled within a reasonable range. Among them, at 120 line pairs / mm, the modulation transfer function values ​​within 1 field of view are all greater than 0.3, indicating that the image quality of the zoom optical system is well controlled at the wide-angle end, which meets the requirements of 4K camera use.

[0190] Figure 20 This is a schematic diagram of the field of view vs. modulation transfer function curve at the telephoto end of the zoom lens provided in Embodiment 2 of the present invention in the visible light band. The vertical axis represents the modulation transfer function value, unit: none; the horizontal axis represents the image height, unit: mm. The simulated visible light band range is 436nm~656nm, with a dominant wavelength of 546nm. Figure 20 It can be seen that the modulation transfer function (MTF) values ​​at various frequencies under different fields of view are all controlled within a reasonable range. Specifically, at 120 line pairs / mm, the MTF values ​​within 1 field of view are all greater than 0.3, and the MTF changes relatively smoothly with the field of view, indicating that the image quality changes are relatively uniform. This demonstrates that the zoom optical system achieves good image quality control at the wide-angle end, meeting the requirements for 4K cameras.

[0191] In summary, the zoom lens provided in Embodiment 2 of the present invention uses 14 lens elements and a certain thickness of flat glass to achieve full-band confocal focusing (wide-angle end) and 18X zoom in the 436nm-870nm band under a 1 / 1.8″ target surface, with higher image quality, suitable for more usage needs in various situations.

[0192] Example 3

[0193] Figure 21 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention. Figure 22 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention, as shown below. Figure 21 and Figure 22As shown, the zoom lens provided in Embodiment 3 of the present invention includes a first fixed lens group S1, a first zoom lens group S2, a second zoom lens group S3, a focusing lens group S4, and a second fixed lens group S5 arranged sequentially along the optical axis from the object plane to the image plane; the optical power of the first fixed lens group S1, the second zoom lens group S3, and the focusing lens group S4 are all positive, while the optical power of the first zoom lens group S2 is negative; the first fixed lens group S1 includes a first lens 101, a second lens 102, a third lens 103, and a fourth lens 104 arranged sequentially along the optical axis from the object plane to the image plane; the first zoom lens group S2 includes a fifth lens 105, a sixth lens 106, and a seventh lens 107 arranged sequentially along the optical axis from the object plane to the image plane; the second zoom lens group S5... The lens group S3 includes an eighth lens 108, a ninth lens 109, a tenth lens 110, and an eleventh lens 111 arranged sequentially from the object plane to the image plane along the optical axis; the focusing lens group S4 includes a twelfth lens 112 and a thirteenth lens 113 arranged sequentially from the object plane to the image plane along the optical axis; the second fixed lens group S5 includes a fourteenth lens 114; wherein, the first lens 101, the fifth lens 105, the sixth lens 106, the tenth lens 110, and the thirteenth lens 113 are all negative power lenses; the second lens 102, the third lens 103, the fourth lens 104, the seventh lens 107, the eighth lens 108, the ninth lens 109, the eleventh lens 111, and the twelfth lens 112 are all positive power lenses.

[0194] The lens setup is the same as in Embodiment 1, and will not be repeated here.

[0195] As another feasible implementation method, the specific parameters of the zoom lens are explained below.

[0196] Table 11. Optical design values ​​for the zoom lens in Example 3

[0197]

[0198] Table 12 Design values ​​of optical physical parameters for a zoom lens

[0199]

[0200] Table 13 Zoom intervals at the wide-angle and telephoto ends of a zoom optical system

[0201]

[0202] The surface numbers in Table 12 above are assigned according to the surface sequence of each lens. "STO" represents the aperture stop of the lens; IMA represents the image plane; the radius of curvature represents the degree of curvature of the corresponding lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane. "INF" indicates that the surface is flat and the radius of curvature is infinite; thickness represents the central axial distance between the current surface and the next surface; refractive index represents the ability of the material between the current surface and the next surface to deflect light; a blank space indicates that the current position is air and the refractive index is 1. The zoom intervals in Table 13 are the different interval values ​​of the lens at the wide-angle and telephoto ends.

[0203] Table 14 below shows the aspheric coefficient values ​​used in the current embodiment; Table 15 shows some specific parameters implemented in this embodiment.

[0204] Table 14 Design values ​​of aspherical conic coefficient in a zoom lens

[0205]

[0206] "-1.681281499E-03" means -1.681281499 × 10 -3 All other coefficients are represented in this way.

[0207] Table 15 Specific parameters for this embodiment

[0208]

[0209] Furthermore, Figure 23 This is a schematic diagram of the transverse chromatic aberration of the zoom lens at the wide-angle end according to Embodiment 3 of the present invention, as shown below. Figure 23 As shown, the vertical axis represents the field of view, 0 indicates being on the optical axis, and the vertex of the vertical axis represents the maximum image height; the dominant wavelength is 546 nm, and the horizontal axis represents the offset relative to the dominant wavelength, in micrometers (μm). Figure 23 It can be seen that the transverse chromatic aberration of different wavelengths is controlled within a small range, indicating that the transverse chromatic aberration of the zoom optical system is well controlled at the wide-angle end, which can meet the application requirements under normal conditions.

[0210] Figure 24 This is a schematic diagram of axial aberration at the wide-angle end of the zoom lens provided in Embodiment 3 of the present invention, as shown below. Figure 24 As shown, the vertical direction represents the normalized aperture, with 0 indicating the optical axis, and the vertical vertex representing the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focal point, in millimeters (mm). Different linear curves in the figure represent different wavelengths of system imaging, determined by... Figure 24It can be seen that the axial aberrations of the normalized aperture at different wavelengths are all controlled within the range of (-0.03mm, +0.03mm), indicating that the spherical aberration of the optical system is well controlled at each wavelength; it can meet the requirements of wide spectrum applications.

[0211] Figure 25 This is a schematic diagram of the modulation transfer function (MTF) curve of the zoom lens at the wide-angle end in visible light according to Embodiment 3 of the present invention. The vertical axis represents the MTF value, unit: none; the horizontal axis represents the spatial frequency, unit: cyc / mm (line pairs / mm). The simulated visible light band range is 436nm~656nm, with a dominant wavelength of 546nm. Figure 25 It can be seen that the modulation transfer function values ​​of each frequency under different fields of view are all controlled within a reasonable range. Among them, at 120 line pairs / mm, the modulation transfer function value within 1 field of view is greater than 0.35, indicating that the image quality of the zoom optical system is well controlled at the wide-angle end, which meets the requirements of 4K camera use.

[0212] Figure 26 This is a schematic diagram of the modulation transfer function (MTF) curve of the zoom lens in the near-infrared band at the wide-angle end, as provided in Embodiment 3 of the present invention. The vertical axis represents the MTF value, unit: none; the horizontal axis represents the spatial frequency, unit: cyc / mm (line pairs / mm). The simulated infrared band range is 830nm~870nm, with a dominant wavelength of 850nm. Figure 26 It can be seen that the modulation transfer function values ​​of each frequency under different fields of view are all controlled within a reasonable range. Among them, at 60 line pairs / mm, the modulation transfer function value within 1 field of view is greater than 0.3, indicating that the image quality of the zoom optical system is well controlled at the wide-angle end, which meets the requirements of 4K camera use.

[0213] Figure 27 This is the transverse chromatic aberration curve at the telephoto end of the zoom lens provided in Embodiment 3 of the present invention. The vertical axis represents the field of view, 0 indicates that it is on the optical axis, and the vertex of the vertical axis represents the maximum image height; the dominant wavelength is 546nm, and the horizontal axis represents the offset relative to the dominant wavelength, in micrometers (μm). Figure 27 It can be seen that the transverse chromatic aberration of different wavelengths is controlled within a small range, indicating that the transverse chromatic aberration of the zoom optical system is well controlled at the telephoto end, which can meet the application requirements under normal conditions.

[0214] Figure 28 This is an axial aberration diagram of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention. The vertical direction represents the normalized aperture, 0 indicates it is on the optical axis, and the vertical vertex represents the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus, in millimeters (mm). Different linear curves in the diagram represent different wavelengths of the system imaging, determined by... Figure 28It can be seen that the axial aberrations of the normalized apertures of different wavelengths from 0 to 1.0 are all controlled within the range of (-0.05 mm, +0.06 mm), indicating that the spherical aberration of the optical system is well controlled at each wavelength; it can meet the requirements of wide spectrum applications.

[0215] Figure 29 This is a schematic diagram of the modulation transfer function (MTF) curve of the zoom lens at the telephoto end in visible light, provided in Embodiment 3 of the present invention. The vertical axis represents the MTF value, unit: none; the horizontal axis represents the spatial frequency, unit: cyc / mm (line pairs / mm). The simulated visible light band range is 436nm~656nm, with a dominant wavelength of 546nm. Figure 29 It can be seen that the modulation transfer function values ​​of each frequency under different fields of view are all controlled within a reasonable range. Among them, at 120 line pairs / mm, the modulation transfer function values ​​within 1 field of view are all greater than 0.3, indicating that the image quality of the zoom optical system is well controlled at the wide-angle end, which meets the requirements of 4K camera use.

[0216] Figure 30 This is a schematic diagram of the field of view vs. modulation transfer function curve at the telephoto end of the zoom lens in the visible light band, provided in Embodiment 3 of the present invention. The vertical axis represents the modulation transfer function value (unit: none); the horizontal axis represents the image height (unit: mm). The simulated visible light band range is 436nm~656nm, with a dominant wavelength of 546nm. Figure 30 It can be seen that the modulation transfer function (MTF) values ​​at various frequencies under different fields of view are all controlled within a reasonable range. Specifically, at 120 line pairs / mm, the MTF values ​​within 1 field of view are all greater than 0.3, and the MTF changes relatively smoothly with the field of view, indicating that the image quality changes are relatively uniform. This demonstrates that the zoom optical system achieves good image quality control at the wide-angle end, meeting the requirements for 4K cameras.

[0217] In summary, the zoom lens provided in Embodiment 3 of the present invention uses 14 lens elements and a certain thickness of flat glass to achieve full-band confocal focusing (wide-angle end) and 18X zoom in the 436nm-870nm band under a 1 / 1.8″ target surface, with higher image quality, suitable for more usage needs in various situations.

[0218] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A zoom lens, characterized in that, It includes a first fixed lens group, a first zoom lens group, a second zoom lens group, a focusing lens group, and a second fixed lens group arranged sequentially along the optical axis from the object plane to the image plane; the optical power of the first fixed lens group, the second zoom lens group, and the focusing lens group are all positive, and the optical power of the first zoom lens group is negative; The first fixed lens group includes a first lens, a second lens, a third lens, and a fourth lens arranged sequentially along the optical axis from the object plane to the image plane; The first zoom lens group includes a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the optical axis from the object plane to the image plane; The second zoom lens group includes an eighth lens, a ninth lens, a tenth lens, and an eleventh lens arranged sequentially along the optical axis from the object plane to the image plane; The focusing lens group includes a twelfth lens and a thirteenth lens arranged sequentially from the object plane to the image plane along the optical axis; The second fixed lens group includes a fourteenth lens; The first lens, the fifth lens, the sixth lens, the tenth lens, and the thirteenth lens are all negative power lenses; the second lens, the third lens, the fourth lens, the seventh lens, the eighth lens, the ninth lens, the eleventh lens, and the twelfth lens are all positive power lenses.

2. The zoom lens according to claim 1, characterized in that, The fourteenth lens is a positive optical power lens, and the optical power of the second fixed lens group is positive. Alternatively, the fourteenth lens may be a negative power lens, and the power of the second fixed lens group may be negative.

3. The zoom lens according to claim 1, characterized in that, The focal length of the first fixed lens group is F1q, the focal length of the first zoom lens group is F2q, the focal length of the second zoom lens group is F3q, the focal length of the focusing lens group is F4q, the focal length of the second fixed lens group is F5q, and the focal length of the zoom lens at the wide-angle end is FW. Among them, 6.135≤F1q / FW≤6.369; -1.243≤F2q / FW≤-1.141; 2.782≤F3q / FW≤2.899; 3.117≤F4q / FW≤10.621; -8.894≤F5q / FW≤4.

984.

4. The zoom lens according to claim 1, characterized in that, The first lens and the second lens are cemented together, and the ninth lens and the tenth lens are cemented together.

5. The zoom lens according to claim 4, characterized in that, The focal length of the ninth lens is f9, the focal length of the tenth lens is f10, the focal length of the cemented lens composed of the ninth lens and the tenth lens is f910, and the focal length of the second zoom lens group is f3q. Among them, -0.964≤f9 / f910≤-0.793; -0.379≤f10 / f910≤-0.341; -0.973≤f910 / f3q≤-0.

894.

6. The zoom lens according to claim 1, characterized in that, The first lens includes a first object-side surface near the object plane and a first image-side surface near the image plane. The first object-side surface is convex, and the first image-side surface is concave. The second lens includes a second object-side surface near the object plane and a second image-side surface near the image plane, wherein the second object-side surface and the second image-side surface are both convex. The third lens includes a third object-side surface near the object plane and a third image-side surface near the image plane. The third object-side surface is convex, and the third image-side surface is concave. The fourth lens includes a fourth object-side surface near the object plane and a fourth image-side surface near the image plane. The fourth object-side surface is convex, and the fourth image-side surface is concave. The fifth lens includes a fifth object-side surface near the object plane and a fifth image-side surface near the image plane. The fifth object-side surface is convex, and the fifth image-side surface is concave. The sixth lens includes a sixth object-side surface near the object plane and a sixth image-side surface near the image plane. The sixth object-side surface is concave, and the sixth image-side surface is concave. The seventh lens includes a seventh object-side surface near the object plane and a seventh image-side surface near the image plane. The seventh object-side surface is convex, and the seventh image-side surface is convex. The eighth lens includes an eighth object-side surface near the object plane and an eighth image-side surface near the image plane. The eighth object-side surface is convex, and the eighth image-side surface is convex. The ninth lens includes a ninth object-side surface near the object plane and a ninth image-side surface near the image plane. The ninth object-side surface is convex, and the ninth image-side surface is convex. The tenth lens includes a tenth object-side surface near the object plane and a tenth image-side surface near the image plane. The tenth object-side surface is concave, and the tenth image-side surface is concave. The eleventh lens includes an eleventh object-side surface near the object plane and an eleventh image-side surface near the image plane. The eleventh object-side surface is convex, and the eleventh image-side surface is concave. The twelfth lens includes a twelfth image-side surface near the image plane, and the twelfth image-side surface is concave. The thirteenth lens includes a thirteenth object-side surface near the object plane and a thirteenth image-side surface near the image plane. The center of the thirteenth object-side surface is convex, and the center of the thirteenth image-side surface is convex. The fourteenth lens includes a fourteenth image side surface near the image plane, and the center of the fourteenth image side surface is convex.

7. The zoom lens according to claim 1, characterized in that, The maximum movable distance of the first zoom lens group is L1, the maximum movable distance of the second zoom lens group is L2, and the maximum total optical length of the zoom lens is TL. Among them, 4.02≤TL / L1≤4.07; 9.32≤TL / L2≤9.

99.

8. The zoom lens according to claim 1, characterized in that, The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, and the twelfth lens are all glass spherical lenses; The sixth lens, the eleventh lens, the thirteenth lens, and the fourteenth lens are all glass aspherical lenses.

9. The zoom lens according to claim 8, characterized in that, The sixth lens has a refractive index of nd6 and an Abbe number of vd6; the eleventh lens has a refractive index of nd11 and an Abbe number of vd11; the thirteenth lens has a refractive index of nd13 and an Abbe number of vd13; and the fourteenth lens has a refractive index of nd14 and an Abbe number of vd14. Among them, 1.439≤nd6≤1.498; 81.548≤vd6≤94.437; 1.439≤nd11≤1.498; 81.548≤vd11≤94.437; 1.439≤nd13≤1.591; 61.250≤vd13≤94.437; 1.498≤nd14≤1.696;53.048≤vd14≤81.531; 10. The zoom lens according to claim 8, characterized in that, The first lens has a refractive index of nd1 and an Abbe number of vd1; the second lens has a refractive index of nd2 and an Abbe number of vd2; the third lens has a refractive index of nd3 and an Abbe number of vd3; and the fourth lens has a refractive index of nd4 and an Abbe number of vd4. Wherein, 1.812≤nd1≤1.888; 33.286≤vd1≤37.185; 1.438≤nd2≤1.498;81.607≤vd2≤95.122; 1.438≤nd3≤1.498; 81.607≤vd3≤95.122; 1.438≤nd4≤1.498;81.607≤vd4≤90.268; 11. The zoom lens according to claim 8, characterized in that, The refractive index of the seventh lens is nd7, and the Abbe number is vd7; Among them, 1.958≤nd7≤2.119; 17.018≤vd7≤17.

942.

12. The zoom lens according to claim 1, characterized in that, The zoom lens has a focal length of FT at the telephoto end and a focal length of FW at the wide-angle end. Where 18≤FT / FW≤18.

02.

13. The zoom lens according to claim 1, characterized in that, The zoom lens has an aperture of FNOT at the telephoto end and an aperture of FNOW at the wide-angle end; Where FNOT=3.5 and FNOW=1.

6.

14. The zoom lens according to claim 1, characterized in that, The zoom lens also includes an aperture stop and a filter; The aperture stop is disposed in the optical path between the first zoom lens group and the second zoom lens group; The filter is disposed in the optical path between the second fixed lens group and the image plane.

Images