A 10X zoom laser illumination lens

Abstract

The present invention discloses a 10x zoom laser illumination lens. The zoom lens includes a lens body. The direction from the object side to the image side along the optical axis of the lens body is from front to back. The lens body includes a lens barrel, a compensation lens group, a zoom lens group, a fixed lens group, and a driving device. The lens barrel extends along the front-back direction, and a cavity is formed inside the lens barrel. The compensation lens group is movably arranged in the cavity along the front-back direction. The zoom lens group is movably arranged in the cavity along the front-back direction. The fixed lens group is fixedly installed in the cavity. The driving device is drivingly connected to the zoom lens group and the compensation lens group. The present invention aims to solve the problems of uneven light spots and serious light spot divergence when the existing zoom laser illumination lens is used at night.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lenses, and particularly to a 10x zoom laser illumination lens. Background Art

[0002] With the application of high-definition imaging lenses and the requirement for imaging of distant objects in night environments, most of the existing laser illuminators adopt one or two lens groups, and the illumination angle is changed by moving a single lens or a group of lenses separately. This method can only ensure the uniformity of the illumination spot at a certain angle, and the spots at other angles are uneven. At the same time, the illumination angle of the current laser illuminator is too large. When irradiating a distant target, the laser spot diverges severely and fails to play the role of illumination. Summary of the Invention

[0003] The main object of the present invention is to provide a 10x zoom laser illumination lens, aiming to solve the problems of uneven spots and severe spot divergence in the existing zoom laser illumination lenses.

[0004] To achieve the above object, a 10x zoom laser illumination lens provided by the present invention includes a lens body. The direction from the object side to the image side along the optical axis of the lens body is from front to back.

[0005] The lens body includes:

[0006] A lens barrel extending in the front-back direction, and a cavity is formed inside the lens barrel;

[0007] A compensation lens group movably disposed in the cavity along the front-back direction;

[0008] A zoom lens group movably disposed in the cavity along the front-back direction;

[0009] A fixed lens group fixedly installed in the cavity; and

[0010] A driving device drivingly connected to the zoom lens group and the compensation lens group;

[0011] The focal length of the compensation lens group is The focal length of the zoom lens group is The focal length of the fixed lens group is The distance between the compensation lens group and the zoom lens group at the wide-angle end is The distance between the compensation lens group and the zoom lens group at the telephoto end is The distance between the zoom lens group and the fixed lens group at the wide-angle end is The distance between the zoom lens group and the fixed lens group at the telephoto end is wherein:

[0012] , , , .

[0013] Optionally, the compensating lens group includes a first lens and a second lens which are sequentially arranged at intervals in the front-back direction; and / or,

[0014] the zoom lens group includes a third lens and a fourth lens which are sequentially arranged at intervals in the front-back direction; and / or,

[0015] the fixed lens group includes a fifth lens, a sixth lens and a seventh lens which are sequentially arranged at intervals in the front-back direction.

[0016] Optionally, in the compensating lens group, the first lens has a positive optical power and the second lens has a positive optical power; and / or,

[0017] in the zoom lens group, the third lens has a negative optical power and the fourth lens has a negative optical power; and / or,

[0018] in the fixed lens group, the fifth lens has a positive optical power, the sixth lens has a positive optical power, and the seventh lens has a negative optical power.

[0019] Optionally, the first lens and the second lens are spherical mirrors; and / or,

[0020] the third lens and the fourth lens are spherical mirrors; and / or,

[0021] the fifth lens, the sixth lens and the seventh lens are all spherical lenses.

[0022] Optionally, the lens body further includes a diaphragm, and the diaphragm is arranged in front of the compensating lens group and is fixed relative to the compensating lens group so as to be driven by the compensating lens group to move in the front-back direction.

[0023] Optionally, the driving device includes:

[0024] a CAM barrel driving mechanism, which is arranged in the cavity, is drivingly connected to the compensating lens, and is used to drive the compensating lens group to move in the front-back direction; and,

[0025] a VCM driving mechanism, which is arranged in the cavity and is used to drive the zoom lens group to move in the front-back direction.

[0026] Optionally, when the compensating lens group and the zoom lens group move away from each other in the front-back direction, the optical length of the lens body is L1, where 69.9 mm ≤ L1 ≤ 90 mm.

[0027] Optionally, the compensation lens group includes a first lens;

[0028] When the compensation lens group and the zoom lens group are moved closer to each other in the front - rear direction, the optical length from the first lens to the bracket for fixing the fixed lens group is not less than 69.9 mm.

[0029] In the technical solution of the present invention, the relative movement between the zoom lens group and the compensation lens group enables the divergence angle of the lens body to be adjustable; the relative movement between the zoom lens group and the compensation lens group finally enables the minimum angle of laser illumination to reach 0.28°, realizing the process of 10 - fold zoom; the fixed lens group remains stationary during this process, ensuring that the angle of the zoom optical lens is small enough to avoid serious divergence of the light spot. Brief Description of the Drawings

[0030] 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.

[0031] Figure 1 Schematic structural diagram (wide - angle end) of an embodiment of the 10 - fold zoom laser illumination lens provided by the present invention;

[0032] Figure 2 Schematic structural diagram (telephoto end) of another embodiment of the 10 - fold zoom laser illumination lens provided by the present invention;

[0033] Figure 3 For Figure 1 simulation laser energy diagram of the wide - angle end 250 m of the lens body in

[0034] Figure 4 For Figure 1 simulation laser energy diagram of the telephoto end 3000 m of the lens body in

[0035] Explanation of the reference numerals in the drawings:

[0036]

[0037] The realization of the object, functional features, and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the drawings. Detailed Embodiments

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, then the directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0040] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present invention, then the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating 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 solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0041] With the application of high-definition imaging lenses and the requirements for imaging of distant objects in night environments, most of the existing laser illuminators use one or two lens groups and achieve the change of illumination angle by moving a single lens or a group of lenses separately. This method can only make the illumination spot uniform at a certain angle, and the spots at other angles are not uniform. At the same time, the illumination angle of the current laser illuminator is too large. If it irradiates a distant target, the laser spot diverges severely and cannot play the role of illumination.

[0042] In view of this, the present invention provides a 10x zoom laser illumination lens. Figures 1 to 4 This is an embodiment of the 10x zoom laser illumination lens provided by the present invention. The following mainly describes the 10x zoom laser illumination lens in conjunction with specific drawings.

[0043] Please refer to Figure 1 and Figure 2, the 10x zoom laser illumination lens includes a lens body 100. The direction from the object side to the image side along the optical axis of the lens body 100 is from front to back; the lens body 100 includes a lens barrel, a compensation lens group 2, a zoom lens group 3, a fixed lens group 4, and a driving device; the lens barrel extends along the front-back direction, and a cavity is formed inside the lens barrel; the compensation lens group 2 is movably arranged in the cavity along the front-back direction; the zoom lens group 3 is movably arranged in the cavity along the front-back direction; the fixed lens group 4 is fixedly installed in the cavity; the driving device is drivingly connected to the zoom lens group 3 and the compensation lens group 2; the focal length of the compensation lens group 2 is , the focal length of the zoom lens group 3 is , the focal length of the fixed lens group 4 is , the distance between the compensation lens group 2 and the zoom lens group 3 at the wide-angle end is , the distance between the compensation lens group 2 and the zoom lens group 3 at the telephoto end is , the distance between the zoom lens group 3 and the fixed lens group 4 at the wide-angle end is , the distance between the zoom lens group 3 and the fixed lens group 4 at the telephoto end is , where:

[0044] , , , .

[0045] In the technical solution of the present invention, the relative movement between the zoom lens group 3 and the compensation lens group 2 enables the divergence angle of the lens body 100 to be adjusted, which facilitates the application of the lens body 100 in more scenarios; the relative movement between the zoom lens group and the compensation lens group finally makes the minimum angle of laser illumination reach 0.28°, realizing the process of 10x zoom; the fixed lens group remains stationary during this process, ensuring that the angle of the zoom optical lens is small enough to avoid serious divergence of the light spot.

[0046] In this embodiment, the compensation lens group 2 includes a first lens 21 and a second lens 22 which are sequentially arranged at intervals in the front-rear direction; the zoom lens group 3 includes a third lens 31 and a fourth lens 32 which are sequentially arranged at intervals in the front-rear direction; the fixed lens group 4 includes a fifth lens 41, a sixth lens 42 and a seventh lens which are sequentially arranged at intervals in the front-rear direction. The first lens 21, the second lens 22, the third lens 31 and the fourth lens 32 are all arranged in the lens barrel and can move relative to the lens in the front-rear direction. It can be understood that when each of the first lens 21, the second lens 22, the third lens 31 and the fourth lens 32 moves in the front-rear direction, there is an active stroke of approaching and separating from the adjacent lens. By adjusting the relative positions between the first lens 21 and the second lens 22 in the zoom lens group 3, the divergence angle of the lens body 100 can be correspondingly changed to adjust the lens body 100 to the required magnification; by adjusting the relative positions of the third lens 31 and the fourth lens 32 in the lens barrel in the zoom lens group 3, the illumination quality of the lens body 100 can be adjusted.

[0047] Further, in an embodiment, in order to ensure the illumination quality, in the compensation lens group 2, the first lens 21 has a positive optical power, and the second lens 22 has a positive optical power; in the zoom lens group 3, the third lens 31 has a negative optical power, and the fourth lens 32 has a negative optical power; in the fixed lens group 4, the fifth lens 41 has a positive optical power, the sixth lens 42 has a positive optical power, and the seventh lens has a negative optical power.

[0048] Furthermore, in this embodiment, the first lens 21 and the second lens 22 are spherical mirrors; the third lens 31 and the fourth lens 32 are spherical mirrors; the fifth lens 41, the sixth lens 42 and the seventh lens are all spherical lenses.

[0049] In an embodiment, the movement of the first lens 21, the second lens 22, the third lens 31 and the fourth lens 32 in the front-rear direction can be achieved by manual operation of the user. Or, in an embodiment, the lens body 100 further includes a driving device for respectively driving the first lens 21, the second lens 22, the third lens 31 and the fourth lens 32 to move in the front-rear direction, so as to realize the automatic and more accurate movement of the first lens 21, the second lens 22, the third lens 31 and the fourth lens 32.

[0050] Specifically, in one embodiment, the driving device includes a CAM barrel driving mechanism, a VCM driving mechanism, and a driving motor. Among them, the CAM barrel driving mechanism is disposed on the lens barrel for driving the first lens 21 and the second lens 22 to move in the front-rear direction respectively; the VCM driving mechanism is disposed on the lens barrel for driving the third lens 31 and the fourth lens 32 to move in the front-rear direction.

[0051] The CAM barrel driving mechanism is a mature technology and will not be elaborated here. Taking the first lens 21 as an example, the CAM barrel driving mechanism is, for example, that the first lens 21 is provided with a frame structure for supporting the lens inside the first lens 21. The frame structure is movably sleeved with a CAM barrel. A guide post is provided at the frame structure, and a CAM groove corresponding to the guide post is provided on the CAM barrel. The guide post is movably connected with the CAM groove, so as to realize the movement of the first lens 21 relative to the lens barrel.

[0052] The VCM driving mechanism is also a mature technology and will not be elaborated here. Taking the third lens 31 as an example, the VCM driving mechanism is, for example, that the third lens 31 is provided with a frame structure for supporting the lens inside the third lens 31. A first magnetic block and a strip-shaped position sensing magnetic sheet are provided on the outer side wall of the frame structure, and the strip-shaped position sensing magnetic sheet extends in the front-rear direction; a VCM motor coil opposite to the magnetic block on the lens barrel and used to drive the frame structure to move back and forth, and a magnetoresistive sensor opposite to the position sensing magnetic sheet and used to detect the position of the frame structure. The VCM motor coil is provided with a coil groove facing the front and back, and a second magnetic block is inserted and fixed in the coil groove. The magnetic poles of the end parts of the first magnetic block and the second magnetic block close to each other attract each other.

[0053] Figure 3 It is the simulation laser energy diagram of the wide-angle end 250m of the lens body in this embodiment; Figure 4 It is the simulation laser energy diagram of the telephoto end 3000m of the lens body in this embodiment.

[0054] Please refer to Figure 3 and Figure 4, in one embodiment, when the compensation lens group 2 and the zoom lens group 3 move away from each other in the front-back direction, the optical length of the lens body 100 is L1, where 69.9 mm ≤ L1 ≤ 90 mm. It can be understood that the lens barrel of the lens body 100 is arranged in a cam structure movement, and can be driven to move along the curved route formed by the cam structure when the first lens 21, the second lens 22, the third lens 31 and the fourth lens 32 move in the front-back direction; thus arranged, when the first lens 21, the second lens 22, the third lens 31 and the fourth lens 32 move away from each other, the length of the lens body 100 is 69.9 - 90 mm. When the length of the lens body 100 is within the above range, interference and mutual influence are avoided during user use.

[0055] Please continue to refer to Figure 3 and Figure 4 In one embodiment, when the compensation lens group 2 and the zoom lens group 3 move close to each other in the front-back direction, the optical length from the first lens 21 to the bracket for fixing the fixed lens group 4 is not less than 69.9 mm. Thus arranged, when the lens body 100 is not in use, it can be shrunk and stored as much as possible.

[0056] Specifically, please refer to Tables 1 to 3. Tables 1 to 3 are the specific data of an embodiment of a 10x zoom laser illumination lens provided by the present invention.

[0057] Among them, S1 - S15 in Table 1 represent the surface numbers of each optical element, R represents the curvature radius of the optical element, D represents the thickness or air gap of the optical element, Nd represents the refractive index of the d light of the optical material used, and Vd represents the Abbe number of the d light of the optical material used. Specifically, the stop surface of the aperture 1, the incident surface S2 of the first lens 21, the exit surface S3 of the first lens 21, the incident surface S4 of the second lens 22, the exit surface S5 of the second lens 22, the incident surface S6 of the third lens 31, the exit surface S7 of the third lens 31, the incident surface S8 of the fourth lens 32, the exit surface S9 of the fourth lens 32, the incident surface S10 of the fifth lens 41, the exit surface S11 of the fifth lens 41, the incident surface S12 of the sixth lens 42, the exit surface S13 of the sixth lens 42, the incident surface S14 of the seventh lens, and the exit surface S15 of the seventh lens.

[0058] In Table 2, ω is the divergence angle of the system laser beam.

[0059] In Table 3, D1 represents the variable distance between the compensation lens group 2 and the zoom lens group 3, and D2 represents the variable distance between the zoom lens group 3 and the fixed lens group 4.

[0060] Table 1 Parameters of each lens

[0061]

[0062] Table 2 Laser Divergence Angle at Wide-Angle End and Telephoto End

[0063]

[0064] Table 3 Spacing between Each Lens Group at Wide-Angle End and Telephoto End

[0065]

[0066] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings 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 10x zoom laser illumination lens, characterized in that, It includes a lens body, and the direction from the object side to the image side along the optical axis of the lens body is from front to back; The lens body includes: A lens barrel extending along the front-back direction, and a cavity is formed inside the lens barrel; A compensating lens group movably arranged in the cavity along the front-back direction; A zoom lens group movably arranged in the cavity along the front-back direction; A fixed lens group fixedly installed in the cavity; and, A driving device drivingly connected to the zoom lens group and the compensating lens group; The focal length of the compensation lens group is , the focal length of the zoom lens group is , the focal length of the fixed lens group is , the distance between the compensation lens group and the zoom lens group at the wide-angle end is , the distance between the compensation lens group and the zoom lens group at the telephoto end is , the distance between the zoom lens group and the fixed lens group at the wide-angle end is , the distance between the zoom lens group and the fixed lens group at the telephoto end is , where: ， ， ， ； The compensating lens group includes a first lens and a second lens sequentially arranged at intervals along the front-back direction; and / or, The zoom lens group includes a third lens and a fourth lens sequentially arranged at intervals along the front-back direction; and / or, The fixed lens group includes a fifth lens, a sixth lens and a seventh lens sequentially arranged at intervals along the front-back direction; In the compensating lens group, the first lens has a positive optical power, and the second lens has a positive optical power; and / or, In the zoom lens group, the third lens has a negative optical power, and the fourth lens has a negative optical power; and / or, In the fixed lens group, the fifth lens has a positive optical power, the sixth lens has a positive optical power, and the seventh lens has a negative optical power; When the compensating lens group and the zoom lens group move away from each other along the front-back direction, the optical length of the lens body is L1, where 69.9mm ≤ L1 ≤ 90mm.

2. The zoom optical lens according to claim 1, wherein, The first lens and the second lens are spherical mirrors; and / or, The third lens and the fourth lens are spherical mirrors; and / or, The fifth lens, the sixth lens and the seventh lens are all spherical lenses.

3. The 10x variable magnification laser illumination lens according to claim 1, characterized in that The lens body further includes a diaphragm, and the diaphragm is arranged in front of the compensating lens group and is fixed relative to the compensating lens group so as to be driven by the compensating lens group to move along the front-back direction.

4. The 10x zoom laser illumination lens according to claim 1, characterized in that, The driving device includes: A CAM barrel driving mechanism arranged in the cavity, drivingly connected to the compensating lens, and used to drive the compensating lens group to move along the front-back direction; and, A VCM driving mechanism arranged in the cavity, used to drive the zoom lens group to move along the front-back direction.

5. The 10x zoom laser illumination lens according to claim 1, characterized in that The compensating lens group includes a first lens; When the compensating lens group and the zoom lens group move close to each other along the front-back direction, the optical length from the first lens to the bracket for fixing the fixed lens group is not less than 69.9mm.

Images