Zoom lens and laser illumination device

Abstract

The present invention discloses a zoom lens and a laser illumination device. The zoom lens includes a lens barrel and a lens group. The lens group includes a first lens group with a positive optical power, a second lens group with a negative optical power, and a third lens group with a positive optical power, which are arranged in sequence from the object side to the image side. Through the reasonable setting of the three lens groups and the conditional limitation of the ratio of the focal length of the wide-angle end of the zoom lens to the focal lengths of each lens group, the zoom ratio of the zoom lens is 150X, its overall optical length is controlled within 100 mm, the F-number of the aperture of the zoom lens can reach 2.27, and it can be applicable to the range within the wavelength of 800-1100 nm, so that the zoom lens has the characteristics of small volume, high magnification, uniform light spot, and low cost, so as to improve the technical problems existing in the existing laser illumination lens, such as small zoom range, large lens volume, and narrow applicable wavelength range.

Description

Technical Field

[0001] The present invention relates to the technical field of optical system design, and particularly relates to a zoom lens and a laser illumination device. Background Art

[0002] In order to effectively utilize the laser output beam and make its illumination angle continuously adjustable within a certain range according to the usage requirements, usually the laser output light is coupled and shaped by an optical fiber for output, and the light output from the optical fiber is then expanded by an optical system so that the final output beam angle of the output beam is adjustable, and the uniformity of the output beam is realized, and finally a uniform illumination spot is obtained on the object surface. Therefore, a long-distance laser illumination device needs to meet the following requirements: First, it needs to meet a certain zoom range, that is, meet a certain angle change range; Second, it needs a small F number in order to fully utilize the energy of the light source; Third, it needs to meet the requirement that the output beam obtains a uniform spot on the object surface, that is, the energy at each point within the illumination range of the beam is relatively uniform. In existing laser illumination zoom lenses, there are problems such as large lens volume, small zoom ratio, and narrow applicable wavelength range, so the requirements cannot be fully met. Summary of the Invention

[0003] The main object of the present invention is to provide a zoom lens and a laser illumination device, aiming to improve the problems of large volume, small zoom ratio, and narrow applicable wavelength range of existing zoom lenses.

[0004] To achieve the above object, the present invention provides a zoom lens. The zoom lens has an object side and an image side that are oppositely arranged along the optical axis direction. The zoom lens includes:

[0005] A lens barrel; and,

[0006] A plurality of lens groups disposed in the lens barrel, including a first lens group with a positive optical power, a second lens group with a negative optical power, a third lens group with a positive optical power, and an optical fiber, which are sequentially arranged from the object side to the image side. Wherein, at least one of the first lens group and the second lens group is movably arranged along the extension direction of the optical axis to zoom the zoom lens, and the third lens group moves along the optical axis direction to focus the zoom lens;

[0007] Wherein, the focal length of the zoom lens at the wide-angle end is fw, the focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, and the zoom lens satisfies the following conditions:

[0008] 0.0015 < fw / f1 < 0.015, and -0.78 < fw / f2 < -0.05, and 0.065 < fw / f3 < 0.37.

[0009] Optionally, fw / f1 = 2 / 327, fw / f2 = -(3 / 43), and fw / f3 = 4 / 41.

[0010] Optionally, the first lens group includes a first lens with a positive optical power and a second lens with a positive optical power, which are arranged in sequence from the object side to the image side;

[0011] Both the first lens and the second lens are glass spherical lenses;

[0012] The focal length of the first lens is f11, and the focal length of the second lens is f12. Each lens in the first lens group satisfies the following conditions:

[0013] 0.07 < f1 / f11 < 0.85, and 0.32 < f1 / f12 < 1.32.

[0014] Optionally, the first lens is a biconvex lens, the second lens is a convex-concave lens, and the image side surface of the second lens is concave;

[0015] Each lens in the first lens group satisfies the following conditions: f1 / f11 = 37 / 73, and f1 / f12 = 1 / 2;

[0016] The optical power of the first lens is 174.19, and the optical power of the second lens is 177.96.

[0017] Optionally, the second lens group includes a third lens with a negative optical power and a fourth lens with a negative optical power, which are arranged in sequence from the object side to the image side;

[0018] The third lens is a glass spherical lens, and the fourth lens is a glass spherical lens;

[0019] The focal length of the third lens is f21, and the focal length of the fourth lens is f22. Each lens in the second lens group satisfies the following conditions:

[0020] 0.31 < f2 / f21 < 0.95, and 0.18 < f2 / f22 < 1.03.

[0021] Optionally, the third lens is a convex-concave lens, the image side surface of the third lens is concave, and the fourth lens is a biconcave lens;

[0022] Each lens in the second lens group satisfies the following conditions: f2 / f21 = 21 / 47, and f2 / f22 = 1 / 2;

[0023] The optical power of the third lens is -10.39, and the optical power of the fourth lens is -9.21.

[0024] Optionally, the third lens group includes a fifth lens with positive refractive power, a sixth lens with positive refractive power, and a seventh lens with positive refractive power, which are sequentially arranged from the object side to the image side;

[0025] The focal length of the fifth lens is f31, the focal length of the sixth lens is f32, and the focal length of the seventh lens is f33. The lenses within the third lens group satisfy the following conditions:

[0026] 0.27 < f3 / f31 < 1.02, 0.03 < f3 / f32 < 0.58, and 0.17 < f3 / f33 < 0.98.

[0027] Optionally, the fifth lens is a biconvex lens, the sixth lens is a convex-concave lens, the image side surface of the sixth lens is concave, the seventh lens is a convex-concave lens, and the image side surface of the seventh lens is concave;

[0028] The lenses within the third lens group satisfy the following conditions: f3 / f31 = 4 / 9, f3 / f32 = 7 / 24, and f3 / f33 = 5 / 21;

[0029] The refractive power of the fifth lens is 12.89, the refractive power of the sixth lens is 19.69, and the refractive power of the seventh lens is 24.36.

[0030] Optionally, the zoom lens further includes a diaphragm, which is set as an adjustable diaphragm. The diaphragm is located between the second lens group and the third lens group or on the third lens group, and the diaphragm is connected to the third lens group to move synchronously with the third lens group;

[0031] The distance from the diaphragm to the image plane of the zoom lens on the optical axis is L, and the optical total length of the zoom lens is TTL. The zoom lens satisfies the following condition: 0.05 < L / TTL < 0.42.

[0032] The present invention further provides a laser illumination device, which includes a zoom lens. The zoom lens has an object side and an image side that are oppositely arranged along the optical axis direction. The zoom lens includes:

[0033] A lens barrel; and,

[0034] A plurality of lens groups, which are arranged in the lens barrel and include a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, and an optical fiber, which are sequentially arranged from the object side to the image side. Among them, at least one of the first lens group and the second lens group is movably arranged along the extending direction of the optical axis to zoom the zoom lens, and the third lens group moves along the optical axis direction to focus the zoom lens;

[0035] Wherein, the focal length of the zoom lens at the wide-angle end is fw, the focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, and the zoom lens satisfies the following conditions:

[0036] 0.0015 < fw / f1 < 0.015, and -0.05 < fw / f2 < 0.21, and 0.065 < fw / f3 < 0.37.

[0037] In the technical solution provided by the present invention, at least one of the first lens group and the second lens group is movably mounted on the lens barrel along the optical axis for zooming, and the third lens group is driven by an external force to move along the optical axis for focusing corresponding to the positions of the first lens group and the second lens group, the illumination wavelength, and the illumination distance, so that the zoom lens maintains a clear image on the illumination surface during the zooming process. Through the reasonable setting of the three lens groups and the conditional limitation of the ratio of the focal length of the wide-angle end of the zoom lens to the focal lengths of each lens group, the zoom ratio of the zoom lens is 150X, the overall optical length is controlled within 100 mm, the F-number of the aperture of the zoom lens can reach 2.27, and it can be applied to the range within the wavelength of 800 - 1100 nm, so that the zoom lens has the characteristics of small volume, high magnification, uniform light spot, and low cost, thereby improving the technical problems existing in the existing laser illumination lens, such as small zoom range, large lens volume, and narrow applicable wavelength range. Description of the Drawings

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0039] Figure 1 It is a schematic structural diagram of the first embodiment of the zoom lens provided by the present invention at the wide-angle end;

[0040] Figure 2 It is a schematic structural diagram of the zoom lens at the intermediate magnification;

[0041] Figure 3 It is a schematic structural diagram of the zoom lens at the telephoto end;

[0042] Figure 4 For Figure 1 the aberration diagram of the zoom lens in when it is at the wide-angle end;

[0043] Figure 5 ForFigure 1 The field curvature diagram of the zoom lens in the wide-angle end in

[0044] Figure 6 is Figure 1 The distortion diagram of the zoom lens in the wide-angle end in

[0045] Figure 7 is Figure 2 The aberration diagram of the zoom lens at the intermediate magnification in

[0046] Figure 8 is Figure 2 The field curvature diagram of the zoom lens at the intermediate magnification in

[0047] Figure 9 is Figure 2 The distortion diagram of the zoom lens at the intermediate magnification in

[0048] Figure 10 is Figure 3 The aberration diagram of the zoom lens in the telephoto end in

[0049] Figure 11 is Figure 3 The field curvature diagram of the zoom lens in the telephoto end in

[0050] Figure 12 is Figure 3 The distortion diagram of the zoom lens in the telephoto end in

[0051] Explanation of the reference numerals in the drawings:

[0052]

[0053]

[0054] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0055] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0056] It should be noted that if there are directional indications involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0057] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes, and cannot be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. Moreover, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or is unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0058] In existing laser illumination zoom lenses, there are problems such as large lens volume, small zoom ratio, and narrow applicable wavelength range.

[0059] The present invention provides a zoom lens, aiming to improve the problems of large volume, small zoom ratio, and narrow applicable wavelength range of existing zoom lenses. Please refer to Figures 1 to 12 The accompanying drawings show specific embodiments of the zoom lens.

[0060] Figures 1 to 12 This is an embodiment of the zoom lens provided by the present invention.

[0061] Please refer to Figures 1 to 3 As shown, the zoom lens has an object side and an image side that are oppositely arranged along the optical axis direction. The zoom lens includes a lens barrel (not shown in the figure) and a plurality of lens groups. The lens barrel extends along the optical axis direction, and the lens groups are arranged inside the lens barrel. The lens groups include a first lens group 1 with a positive optical power, a second lens group 2 with a negative optical power, a third lens group 3 with a positive optical power, and an optical fiber 4, which are arranged in sequence from the object side to the image side. Among them, at least one of the first lens group 1 and the second lens group 2 is movably arranged along the extension direction of the optical axis to zoom the zoom lens, and the third lens group 3 moves along the optical axis direction to focus the zoom lens.

[0062] It should be noted that when at least one of the first lens group 1 and the second lens group 2 moves along the extension direction of the optical axis for zooming, the third lens group 3 is driven by an external force to move along the optical axis in correspondence with the positions of the first lens group 1 and the second lens group 2, the illumination wavelength, and the illumination distance for focusing, so that the zoom lens maintains a clear image on the illumination surface during the zooming process.

[0063] It should also be noted that at least one of the first lens group 1 and the second lens group 2 can be driven by an external force to move along the optical axis direction. Herein, the external force drive can be a drive motor drive or manual adjustment by a human, without limitation herein.

[0064] Moreover, the focal length of the zoom lens at the wide-angle end is fw, the focal length of the first lens group 1 is f1, the focal length of the second lens group 2 is f2, the focal length of the third lens group 3 is f3, and the zoom lens satisfies the following conditions:

[0065] 0.0015 < fw / f1 < 0.015, and -0.78 < fw / f2 < -0.05, and 0.065 < fw / f3 < 0.37.

[0066] In the technical solution provided by the present invention, at least one of the first lens group 1 and the second lens group 2 is movably mounted on the lens barrel along the optical axis direction for zooming, and the third lens group 3 is driven by an external force to move along the optical axis for focusing corresponding to the positions of the first lens group 1 and the second lens group 2, the illumination wavelength, and the illumination distance, so that the image plane is kept in clear imaging during the zooming process of the zoom lens. Through the reasonable setting of the three lens groups and the conditional limitation of the ratio of the focal length of the wide-angle end of the zoom lens to the focal lengths of each lens group, the zoom ratio of the zoom lens is 150X, its overall optical length is controlled within 100 mm, the F-number of the aperture of the zoom lens can reach 2.27, and it can be applicable to the range within the wavelength of 800 - 1100 nm, so that the zoom lens has the characteristics of small volume, high magnification, uniform light spot, and low cost, to improve the technical problems existing in the existing laser illumination lens, such as small zoom range, large lens volume, and narrow applicable wavelength range.

[0067] In a specific embodiment, fw / f1 = 2 / 327, and fw / f2 = -(3 / 43), and fw / f3 = 4 / 41.

[0068] Specifically, in this embodiment, the first lens group 1 includes a first lens 11 with positive optical power and a second lens 12 with positive optical power, which are sequentially arranged from the object side to the image side; both the first lens 11 and the second lens 12 are glass spherical lenses; the focal length of the first lens 11 is f11, the focal length of the second lens 12 is f12, and the lenses in the first lens group 1 satisfy the following conditions: 0.07 < f1 / f11 < 0.85, and 0.32 < f1 / f12 < 1.32.

[0069] In a specific embodiment, the first lens 11 is a biconvex lens, the second lens 12 is a convex-concave lens, and the image side surface of the second lens 12 is a concave surface; each lens in the first lens group 1 satisfies the following conditions: f1 / f11 = 37 / 73, and f1 / f12 = 1 / 2; the optical power of the first lens 11 is 174.19, and the optical power of the second lens 12 is 177.96.

[0070] Specifically, in this embodiment, the second lens group 2 includes a third lens 21 with a negative optical power and a fourth lens 22 with a negative optical power, which are arranged in sequence from the object side to the image side; the third lens 21 is a glass aspherical lens, and the fourth lens 22 are both glass spherical lenses; the focal length of the third lens 21 is f21, and the focal length of the fourth lens 22 is f22. Each lens in the second lens group 2 satisfies the following conditions: 0.31 < f2 / f21 < 0.95, and 0.18 < f2 / f22 < 1.03.

[0071] In a specific embodiment, the third lens 21 is a convex-concave lens, the image side surface of the third lens 21 is a concave surface, the fourth lens 22 is a biconcave lens; each lens in the second lens group 2 satisfies the following conditions: f2 / f21 = 21 / 47, and f2 / f22 = 1 / 2; the optical power of the third lens 21 is -10.39, and the optical power of the fourth lens 22 is -9.21.

[0072] Specifically, in this embodiment, the third lens group 3 includes a fifth lens 31 with a positive optical power, a sixth lens 32 with a positive optical power, and a seventh lens 33 with a positive optical power, which are arranged in sequence from the object side to the image side; the focal length of the fifth lens 31 is f31, the focal length of the sixth lens 32 is f32, and the focal length of the seventh lens 33 is f33. Each lens in the third lens group 3 satisfies the following conditions: 0.27 < f3 / f31 < 1.02, and 0.03 < f3 / f32 < 0.58, and 0.17 < f3 / f33 < 0.98.

[0073] In a specific embodiment, the fifth lens 31 is a biconvex lens, the sixth lens 32 is a convex-concave lens, the image side surface of the sixth lens 32 is a concave surface, the seventh lens 33 is a convex-concave lens, and the image side surface of the seventh lens 33 is a concave surface; each lens in the third lens group 3 satisfies the following conditions: f3 / f31 = 4 / 9, and f3 / f32 = 7 / 24, and f3 / f33 = 5 / 21; the optical power of the fifth lens 31 is 12.89, the optical power of the sixth lens 32 is 19.69, and the optical power of the seventh lens 33 is 24.36.

[0074] It should be noted that the optical power is equal to the difference between the convergence of the image-side light beam and the convergence of the object-side light beam, which characterizes the ability of the optical system to deflect light rays. The positive optical power of the first lens group 1, the negative optical power of the second lens group 2, and the positive optical power of the third lens group 3 can project the light beam in the required designed direction. In this embodiment, by reasonably distributing the optical powers of the first lens 11, the second lens 12, the third lens 21, the fourth lens 22, the fifth lens 31, the sixth lens 32, and the seventh lens 33, adjusting the glass shape and material combination, chromatic aberration and secondary spectrum are effectively eliminated, and spherical aberration, coma, astigmatism, etc. on each lens are compensated and offset from each other to achieve the effect of uniform illumination.

[0075] Moreover, the first lens 11, the second lens 12, the third lens 21, the fourth lens 22, the fifth lens 31, the sixth lens 32, and the seventh lens 33 are all glass spherical lenses. Since glass lenses are not easily affected by thermal expansion and contraction and do not have the problem of focus shift, glass lenses can well resist the problem of lens deformation due to heat, maintain the high precision of the lens for a long time, and on the premise of ensuring image quality and reliability, reduce costs, have a lower assembly sensitivity, and improve the yield of finished products.

[0076] Specifically, in this embodiment, the zoom lens further includes a diaphragm, the diaphragm is set as an adjustable diaphragm, the diaphragm is located between the second lens group 2 and the third lens group 3 or on the third lens group 3, and the diaphragm is connected to the third lens group 3 to move synchronously with the third lens group 3; the distance from the diaphragm to the image plane of the zoom lens on the optical axis is L, and the optical total length of the zoom lens is TTL. The zoom lens satisfies the following condition: 0.05 < L / TTL < 0.42. It should be noted that the optical total length is the distance from the center vertex of the object side surface of the first lens 11 to the image plane.

[0077] Specifically, in this embodiment, the zoom lens further includes a filter, the filter is located between the third lens group 3 and the image plane, and the filter is used to filter out unnecessary wavelength bands of light and stray light to reduce optical noise and make it easier for the subsequent optoelectronic module processing part, and the filter can also be used to adjust the color degree of the object image during final imaging, thereby improving the imaging quality.

[0078] Specifically, the image plane can be understood as the surface of the optical fiber 4 facing the object side, that is, the light output end face of the optical fiber. It can be understood that the light emitted from the optical fiber can sequentially pass through the third lens group 3, the second lens group 2, and the first lens group 1 and finally irradiate the surface of the object to be irradiated.

[0079] Specifically, in a specific embodiment, the refractive index, radius of curvature, and thickness interval of the lens material are shown in the following table:

[0080]

[0081] Specifically, the zoom lens in this embodiment achieves the following performance parameters:

[0082] Table 2 Zoom data of the zoom lens at the wide-angle end, intermediate magnification position, and telephoto end

[0083]

[0084]

[0085] The optical distortion range of the zoom lens is between 0.02% and 0.4%; the overall optical length of the zoom lens is controlled at TTL = 100mm.

[0086] In this embodiment, please refer to Figures 1 to 3 for the schematic structural diagrams of the zoom lens at the wide-angle end, intermediate magnification, and telephoto end; among them, the intermediate magnification can be understood as the position schematic diagram of each lens group in the zoom lens when the zoom lens is between the wide-angle end and the telephoto end.

[0087] Figures 4 to 6 The longitudinal aberration diagram, field curvature diagram, and distortion diagram of the zoom lens at the wide-angle end are respectively shown. In the figure, S and T respectively represent the aberrations corresponding to the sagittal image plane and the meridional image plane.

[0088] Please refer to Figures 7 to 9 for the aberration diagram, field curvature diagram, and distortion diagram of the zoom lens at the intermediate magnification. In the figure, S and T respectively represent the aberrations corresponding to the sagittal image plane and the meridional image plane.

[0089] Please refer to Figures 10 to 12 for the spherical aberration diagram, field curvature diagram, and distortion diagram of the zoom lens at the telephoto end. In the figure, S and T respectively represent the aberrations corresponding to the sagittal image plane and the meridional image plane.

[0090] As can be seen from the above figures, the spherical aberration, field curvature, and distortion of the zoom lens in this embodiment can be well corrected at the intermediate magnification, wide-angle end, and telephoto end respectively.

[0091] In addition, the present invention further provides a laser illumination device, and the laser illumination device includes the zoom lens described in the above technical solution. Since the laser illumination device includes the zoom lens, the specific structure of the zoom lens refers to the above embodiments. Since the zoom lens of the present laser illumination device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here.

[0092] The above are only optional embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the inventive concept of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A zoom lens, characterized in that: The zoom lens has an object side and an image side that are oppositely arranged along the optical axis direction, and the zoom lens includes: A lens barrel; and, A plurality of lens groups disposed within the lens barrel, including a first lens group with a positive optical power, a second lens group with a negative optical power, a third lens group with a positive optical power, and an optical fiber, arranged in sequence from the object side to the image side. Among them, at least one of the first lens group and the second lens group is movably arranged along the extension direction of the optical axis to zoom the zoom lens, and the third lens group moves along the optical axis direction to focus the zoom lens; Among them, the focal length of the zoom lens at the wide-angle end is fw, the focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, and the zoom lens satisfies the following conditions: 0.0015 < fw / f1 < 0.015, and -0.78 < fw / f2 < -0.05, and 0.065 < fw / f3 < 0.37; The first lens group includes a first lens with a positive optical power and a second lens with a positive optical power, arranged in sequence from the object side to the image side. Both the first lens and the second lens are glass spherical lenses. The focal length of the first lens is f11, and the focal length of the second lens is f12. Each lens within the first lens group satisfies the following conditions: 0.07 < f1 / f11 < 0.85, and 0.32 < f1 / f12 < 1.32; The second lens group includes a third lens with a negative optical power and a fourth lens with a negative optical power, arranged in sequence from the object side to the image side. The third lens is a glass spherical lens, and the fourth lens is a glass spherical lens. The focal length of the third lens is f21, and the focal length of the fourth lens is f22. Each lens within the second lens group satisfies the following conditions: 0.31 < f2 / f21 < 0.95, and 0.18 < f2 / f22 < 1.03; The third lens group includes a fifth lens with a positive optical power, a sixth lens with a positive optical power, and a seventh lens with a positive optical power, arranged in sequence from the object side to the image side. The focal length of the fifth lens is f31, the focal length of the sixth lens is f32, and the focal length of the seventh lens is f33. Each lens within the third lens group satisfies the following conditions: 0.27 < f3 / f31 < 1.02, and 0.03 < f3 / f32 < 0.58, and 0.17 < f3 / f33 < 0.

98.

2. The zoom lens according to claim 1, wherein, fw / f1 = 2 / 327, and fw / f2 = -(3 / 43), and fw / f3 = 4 / 41.

3. The zoom lens according to claim 1, characterized in that, The first lens is a biconvex lens, the second lens is a convex-concave lens, and the image side surface of the second lens is concave; Each lens within the first lens group satisfies the following conditions: f1 / f11 = 37 / 73, and f1 / f12 = 1 / 2; The optical power of the first lens is 174.19, and the optical power of the second lens is 177.

96.

4. The zoom lens according to claim 1, wherein: The third lens is a convex-concave lens, the image side surface of the third lens is a concave surface, and the fourth lens is a biconcave lens; Each lens in the second lens group satisfies the following conditions: f2 / f21=21 / 47, and f2 / f22=1 / 2; The focal power of the third lens is -10.39, and the focal power of the fourth lens is -9.

21.

5. The zoom lens according to claim 1, wherein The fifth lens is a biconvex lens, the sixth lens is a convex-concave lens, the image side surface of the sixth lens is concave, and the seventh lens is a convex-concave lens, the image side surface of the seventh lens is concave; Each lens in the third lens group satisfies the following conditions: f3 / f31=4 / 9, f3 / f32=7 / 24, and f3 / f33=5 / 21; The optical power of the fifth lens is 12.89, the optical power of the sixth lens is 19.69, and the optical power of the seventh lens is 24.

36.

6. The zoom lens according to claim 1, wherein, The zoom lens further includes an aperture, which is configured as an adjustable aperture. The aperture is located between the second lens group and the third lens group or on the third lens group, and is connected to the third lens group to move synchronously with the third lens group. The distance from the aperture to the image plane of the zoom lens on the optical axis is L, the total optical length of the zoom lens is TTL, and the zoom lens meets the following conditions: 0.05 <L / TTL<0.42。 7. A laser lighting device, characterized in that: The zoom lens comprises the zoom lens according to any one of claims 1 to 6.

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