Infrared continuous zoom lens with large zoom ratio

Abstract

The utility model belongs to the technical field of optical lenses, and particularly relates to an infrared continuous zoom lens with a large zoom ratio, which comprises a front fixing group, a zoom lens group, a compensating lens group, a middle fixing group, a focusing lens group, a reflecting lens group and a rear fixing group. The linear bearings and the guide optical shafts are adopted, the movement performance is good, the whole machine layout is very compact, and the whole machine size is relatively small.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical lenses, and in particular relates to a large-variable-ratio infrared continuous zoom lens. Background Art

[0002] A zoom lens is a camera lens that can change its focal length within a certain range, thereby obtaining different widths of field angles, different sizes of images, and different ranges of scenery. A zoom lens can change the shooting range by changing the focal length without changing the shooting distance, so it is very helpful for picture composition. Since a zoom lens can play the role of several fixed-focus lenses, it not only reduces the number of photographic equipment carried when traveling, but also saves time for changing lenses. The spatial resolution of traditional infrared continuous zoom lenses is low, resulting in poor image quality, and they are relatively bulky and inconvenient to use because of their large size.

[0003] In this regard, the utility model proposes a large zoom ratio infrared continuous zoom lens, which adopts the form of a single slot for zooming and compensating plus a guide optical axis, saves space and has good imaging stability. It adopts a linear bearing plus a guide optical axis, has good motion performance, and the overall layout is very compact, and the overall volume is relatively small. Utility Model Content

[0004] In order to solve the above-mentioned problems existing in the prior art, the utility model provides a large zoom ratio infrared continuous zoom lens, which adopts the form of a single slot for zooming and compensating plus a guide optical axis, saves space and has good imaging stability, adopts linear bearings plus a guide optical axis, has good motion performance, and the overall layout is very compact, and the overall volume is relatively small.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a large-variable-ratio infrared continuous zoom lens, which comprises a first lens frame, a focusing guide pin, a whole machine bracket, a zoom lens barrel, a focusing lens barrel, a reflector bracket one, a focusing cam barrel, a reflector bracket two, a main lens barrel bracket, a focusing motor gear pressing block, a reflective shading barrel, a focusing motor bracket, a movement bracket, a zoom lens seat, a compensation lens seat, a zoom and wear-reducing gasket, a zoom motor, a reflector first pressing frame, a reflector second lens frame, a zoom motor bracket, a focusing motor, a focusing cam wear-reducing gasket, a zoom pin, a first reflector, The second reflecting mirror, the focusing lens seat, the first lens spacer, the optical axis, the zoom cam barrel, the zoom motor gear, the zoom motor gear pressing block, the focusing motor gear, the first lens pressing ring, the second lens pressing ring, the third lens pressing block, the fourth lens pressing ring, the fifth lens pressing ring, the sixth and seventh lens pressing rings, the sixth and seventh lens spacers, the zoom limit switch bracket, the zoom limit lever, the focus limit switch bracket, the focus limit lever, the fifth lens, the circuit board bracket, the sixth lens, the seventh lens, the first lens, the second lens, the third lens, the fourth lens, the linear bearing pressing block, the linear bearing spacer, and the linear bearing;

[0006] A circle of steel balls is arranged in the outer groove at the bottom of the zoom lens barrel, and the outer surface of the zoom lens barrel and the inner surface of the zoom cam barrel are rubbed by the steel balls. The zoom limit lever is fixed in the reserved hole of the zoom lens barrel and connected to the zoom lens barrel by threads. A variable magnification friction reducing gasket is arranged above the zoom cam barrel and the steel balls.

[0007] The zoom lens holder is connected to the second lens pressing ring by a threaded connection, the second lens is fixed in the zoom lens holder, the optical axis is arranged in a reserved hole of the zoom lens barrel, the zoom lens holder is connected to the zoom lens barrel through the optical axis, two linear bearings are arranged at the bottom end of the optical axis, the two linear bearings are connected by a linear bearing spacer, and the zoom lens holder is connected to the linear bearing pressing block by a screw;

[0008] The third lens is fixed in the compensation lens holder by screws between the third lens pressing block and the compensation lens holder, the compensation lens holder is connected to the zoom lens barrel through the optical axis, and the compensation lens holder is connected to the linear bearing pressing block by screws;

[0009] The focusing lens barrel is connected to the zoom lens barrel by screws, the focusing lens barrel is fixed to the optical axis by screws, the zoom pin is fixed in a reserved hole of the focusing lens seat, and the zoom pin is matched with the focusing lens seat by threads;

[0010] The fourth lens and the fourth lens pressing ring are connected via threads;

[0011] A circle of steel balls is arranged around the outside of the bottom of the focusing cam barrel, the focusing cam barrel is arranged outside the focusing lens barrel, the fifth lens pressing ring is connected to the focusing lens seat through a thread, and the fifth lens is fixed in the focusing lens seat;

[0012] The focusing lens seat is arranged in the focusing lens barrel, the focusing guide pin is arranged in the reserved hole of the focusing lens seat and is connected to the focusing lens seat through a thread, and the focusing limit lever is arranged in the reserved hole of the focusing lens seat and is connected to the focusing lens seat through a thread;

[0013] The focus limit switch bracket and the focus lens barrel are connected by screws;

[0014] The zoom limit switch bracket and the zoom lens barrel are connected by screws;

[0015] The first reflector is disposed in a reflector bracket 1 and connected to the reflector bracket 1 by screws;

[0016] The reflector bracket 1 is matched with the focusing cam barrel through screws;

[0017] The zoom lens barrel is connected to the main lens barrel bracket by screws, and the main lens barrel bracket and the focusing lens barrel are fixed to the whole machine bracket by screws;

[0018] The sixth lens, the sixth and seventh lens spacers, and the seventh lens are arranged in the second reflector bracket, and the sixth and seventh lens pressure rings are connected to the second reflector bracket by screws;

[0019] The second reflector is arranged in a second reflector frame, and the second reflector frame is connected to the second reflector bracket by screws;

[0020] The reflective light-shielding cylinder is arranged in the limiting hole of the reflector bracket 1, the reflective light-shielding cylinder is connected to the reflector bracket 2 by screws, and the reflector bracket 2 is connected to the whole machine bracket by screws;

[0021] The first lens spacer is installed in the first lens frame, the first lens is installed in the first lens frame, the first lens frame is connected to the first lens pressing ring through threads, and the first lens is fixed in the first lens frame.

[0022] The first mirror frame is connected to the whole machine bracket by screws;

[0023] The zoom motor is installed in the reserved hole of the zoom motor gear, the zoom motor is fixed to the zoom motor bracket by screws, the zoom motor gear and the zoom motor gear pressing block are fixed by screws, the zoom motor gear is meshed and connected with the zoom cam barrel gear, and the zoom motor bracket is fixed to the focusing lens barrel by screws;

[0024] The focus motor is installed in the reserved hole of the focus motor gear, the focus motor is fixed to the focus motor bracket by screws, the focus motor gear and the focus motor gear pressing block are fixed by screws, the focus motor gear is meshed and connected with the focus cam barrel gear, and the focus motor bracket is fixed to the main barrel bracket by screws;

[0025] On the side of the lens close to the second reflector, the movement bracket is connected to the whole machine bracket by screws, and on the side of the lens close to the first reflector, the circuit board bracket is connected to the whole machine bracket by screws.

[0026] As a preferred technical solution of a large zoom ratio infrared continuous zoom lens of the utility model, the first lens forms a front fixed group.

[0027] As a preferred technical solution of a large zoom ratio infrared continuous zoom lens of the utility model, the second lens constitutes a zoom lens group.

[0028] As an optimal technical solution of the large zoom ratio infrared continuous zoom lens of the utility model, the third lens forms a compensation lens group.

[0029] As an optimal technical solution of a large zoom ratio infrared continuous zoom lens of the utility model, the fourth lens forms a middle fixed group.

[0030] As a preferred technical solution of a large zoom ratio infrared continuous zoom lens of the utility model, the fifth lens forms a focusing lens group.

[0031] As a preferred technical solution of a large-variable-ratio infrared continuous zoom lens of the utility model, the first reflector and the second reflector form a reflector group.

[0032] As an optimal technical solution of a large zoom ratio infrared continuous zoom lens of the utility model, the sixth lens and the seventh lens form a rear fixed group.

[0033] Compared with the prior art, the beneficial effects of the utility model are:

[0034] 1. The utility model adopts the form of a single slot for zooming and compensating plus a guide optical axis, which saves space and has good imaging stability. It adopts a linear bearing plus a guide optical axis, has good motion performance, a very compact layout, and a relatively small size.

[0035] 2. The utility model matches the single curved groove for magnification and compensation on the cam barrel with the optical axis and the linear bearing, and drives the magnification lens group and the compensation lens group to move along the axial direction of the optical axis at the same time, so as to realize continuous change of the focal length of the whole lens; the focusing motor assembly drives the focusing gear barrel to rotate and makes the focusing lens group move along the curved groove, so as to realize axial movement of the focusing lens, so as to achieve clear imaging of high and low temperature or targets at different distances.

[0036] 3. The utility model can realize X-continuous zoom, which satisfies the requirement that the lens has a stable imaging effect in a wide temperature range of -° to +°. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0038] Figure 1 This is a front view structural schematic diagram of the utility model;

[0039] Figure 2 It is a rear view structural schematic diagram of the utility model;

[0040] Figure 3 It is a front view cross-sectional structural schematic diagram of the utility model;

[0041] Figure 4 It is a rear cross-sectional structural schematic diagram of the utility model;

[0042] Figure 5 It is a schematic diagram of the side cross-sectional structure of the rear fixing group connection of the utility model.

[0043] In the figure: 1, the first lens frame; 2, the focus guide pin; 3, the whole machine bracket; 4, the zoom lens barrel; 5, the focus lens barrel; 6, the reflector bracket 1; 7, the focus cam barrel; 8, the reflector bracket 2; 9, the main lens barrel bracket; 10, the focus motor gear pressure block; 11, the reflective light shielding barrel; 12, the focus motor bracket; 13, the movement bracket; 14, the zoom lens seat; 15, the compensation lens seat; 16, the zoom and friction reducing gasket; 17, the zoom motor; 18, the reflector 1 pressure frame; 19, the reflector 2 lens frame; 20, the zoom motor bracket; 21, the focus motor; 22, the focus cam friction reducing gasket; 23, the zoom pin; 24, the first reflector; 25, the second reflector; 26, the focus lens seat; 27, the first lens spacer; 28, the optical axis; 29, Zoom cam barrel; 30, zoom motor gear; 31, zoom motor gear pressure block; 32, focus motor gear; 33, first lens pressure ring; 34, second lens pressure ring; 35, third lens pressure block; 36, fourth lens pressure ring; 37, fifth lens pressure ring; 38, sixth and seventh lens pressure rings; 39, sixth and seventh lens spacers; 40, zoom limit switch bracket; 41, zoom limit lever; 42, focus limit switch bracket; 43, focus limit lever; 44, fifth lens; 45, circuit board bracket; 46, sixth lens; 47, seventh lens; 48, first lens; 49, second lens; 50, third lens; 51, fourth lens; 52, linear bearing pressure block; 53, linear bearing spacer; 54, linear bearing. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0045] Example

[0046] See also Figure 1-5The utility model provides the following technical solutions: a large zoom ratio infrared continuous zoom lens, the large zoom ratio infrared continuous zoom lens comprises a first lens frame 1, a focus guide pin 2, a whole machine bracket 3, a zoom lens barrel 4, a focus lens barrel 5, a reflector bracket 1 6, a focus cam barrel 7, a reflector bracket 2 8, a main lens barrel bracket 9, a focus motor gear pressing block 10, a reflective light shielding barrel 11, a focus motor bracket 12, a movement bracket 13, a zoom lens seat 14, a compensation lens seat 15, a zoom and wear-reducing gasket 16, a zoom motor 17, a reflector first pressing frame 18, a reflector second lens frame 19, a zoom motor bracket 20, a focus motor 21, a focus cam wear-reducing gasket 22, a zoom pin 23, a first reflector 24, a second reflector 25, and a focus lens seat 26. , a first lens spacer 27, an optical axis 28, a zoom cam barrel 29, a zoom motor gear 30, a zoom motor gear pressing block 31, a focus motor gear 32, a first lens pressing ring 33, a second lens pressing ring 34, a third lens pressing block 35, a fourth lens pressing ring 36, a fifth lens pressing ring 37, sixth and seventh lens pressing rings 38, sixth and seventh lens spacers 39, a zoom limit switch bracket 40, a zoom limit shift lever 41, a focus limit switch bracket 42, a focus limit shift lever 43, a fifth lens 44, a circuit board bracket 45, a sixth lens 46, a seventh lens 47, a first lens 48, a second lens 49, a third lens 50, a fourth lens 51, a linear bearing pressing block 52, a linear bearing spacer 53, and a linear bearing 54;

[0047] Among them, the front fixed group is composed of the first lens 48;

[0048] The second lens 49 forms a zoom lens group;

[0049] The compensation lens group is composed of the third lens 50;

[0050] A middle fixed group is formed by the fourth lens 51;

[0051] A focusing lens group is formed by a fifth lens 44;

[0052] The sixth lens 46 and the seventh lens 47 form a rear fixed group.

[0053] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the arrangement and coordination of the components of the large zoom ratio infrared continuous zoom lens are as follows:

[0054] A circle of steel balls is placed in the outer groove at the bottom of the zoom lens barrel 4, which is not marked in the figure. The outer surface of the zoom lens barrel 4 and the inner surface of the zoom cam barrel 29 realize rolling friction through the steel balls. After the inner wall of the zoom cam barrel 29 cooperates with the outer side of the zoom lens barrel 4, the zoom limit lever 41 is connected to the zoom lens barrel 4 through a threaded connection, and the zoom limit lever 41 is fixed in the reserved hole of the zoom lens barrel 4. A circle of steel balls is placed in the gap between the zoom cam barrel 29 and the zoom lens barrel 4, and then a zoom cam washer 16 is placed above the zoom cam barrel 29 and the steel balls. While the zoom cam washer 16 fixes the steel balls, it can reduce the friction noise generated when the zoom cam barrel 29 rotates. The zoom lens holder 14 and the second lens pressure ring 34 are connected by a screw thread. The second lens 49 is fixed in the zoom lens holder 14 by threaded connection. The zoom lens holder 14 is connected to the zoom lens barrel 4 through the optical axis 28. The optical axis 28 is set in the reserved hole of the zoom lens barrel 4. Two linear bearings 54 are set at the bottom end of the optical axis 28. The two linear bearings 54 are connected by a linear bearing spacer 53. The zoom lens holder 14 and the linear bearing pressing block 52 are connected by screws to fix the linear bearing 54 in the zoom lens holder 14. The linear bearing 54 connects the optical axis 28 and the zoom lens holder 14, and the linear bearing 54 enables the zoom lens holder 14 to make a linear motion along the optical axis 28. The optical axis 28 and the zoom lens barrel 4 are connected by screws to fix the optical axis 28 inside the zoom lens barrel 4. The zoom group is installed.

[0055] The third lens 50 is fixed in the compensation lens holder 15 by screws between the third lens pressing block 35 and the compensation lens holder 15, the compensation lens holder 15 is connected to the zoom lens barrel 4 by the optical axis 28, the optical axis 28 is arranged in the reserved hole of the compensation lens holder 15, the linear bearing 54 is placed in the compensation lens holder 15, the compensation lens holder 15 and the linear bearing pressing block 52 are connected by screws, the linear bearing 54 is fixed in the compensation lens holder 15, the linear bearing 54 connects the optical axis 28 and the compensation lens holder 15, and the linear bearing 54 enables the compensation lens holder 15 to make a linear motion along the optical axis 28, the optical axis 28 and the zoom lens barrel 4 are fixed inside the zoom lens barrel 4 by screws, and the compensation group is installed;

[0056] The focusing lens barrel 5 is connected to the zoom lens barrel 4 by screws, and the focusing lens barrel 5 is fixed above the zoom lens barrel 4. At the same time, the focusing lens barrel 5 and the optical axis 28 are fixed by screws, and the zoom pin 23 is threadedly matched with the focusing lens seat 26, and the zoom pin 23 is fixed in the reserved hole of the focusing lens seat 26;

[0057] The fourth lens 51 is connected to the fourth lens pressing ring 36 by threads, and the fourth lens pressing ring 36 is fixed in the focusing lens barrel 5, and the middle fixing group is installed;

[0058] A circle of steel balls is placed around the outside of the bottom of the focusing cam tube 7, and then the focusing cam tube 7 is placed outside the focusing lens tube 5. The fifth lens pressing ring 37 is connected to the focusing lens holder 26 by threads, and the fifth lens 44 is fixed in the focusing lens holder 26;

[0059] Put the focusing lens seat 26 into the focusing lens barrel 5, place the focusing guide pin 2 into the reserved hole of the focusing lens seat 26, the focusing guide pin 2 and the focusing lens seat 26 are connected by threads, the focusing limit lever 43 is placed in the reserved hole of the focusing lens seat 26, the focusing limit lever 43 and the focusing lens seat 26 are connected by threads, and the focusing limit lever 43 is fixed to the outside of the focusing lens seat 26, and the focusing group is installed;

[0060] The focus limit switch bracket 42 and the focus lens barrel 5 are connected by screws, and the focus limit switch bracket 42 is fixed on the focus lens barrel 5;

[0061] The zoom limit switch bracket 40 and the zoom lens barrel 4 are connected by screws, and the zoom limit switch bracket 40 is fixed on the focusing lens barrel 5;

[0062] Furthermore, during the rotation of the focusing lens barrel 5 and the zoom lens barrel 4, the focusing limit switch and the zoom limit switch limit the third lens 50 and the second lens 49, a circle of steel balls is placed outside the focusing cam barrel 7, the focusing cam barrel 7 is placed outside the focusing lens barrel 5, a circle of steel balls is placed at the interval between the focusing cam barrel 7 and the focusing lens barrel 5, and then the focusing cam friction reducing gasket 22 is placed above the focusing cam barrel 7;

[0063] The first reflector 24 is placed in the reflector bracket 16, and the reflector pressing frame 18 is connected to the reflector bracket 16 by screws to fix the first reflector 24 in the reflector bracket 16;

[0064] The reflector bracket 1 6 is matched with the focusing cam tube 7 by screws;

[0065] The zoom lens barrel 4 is connected to the main lens barrel bracket 9 by screws, and the main lens barrel bracket 9 and the focusing lens barrel 5 are fixed to the whole machine bracket 3 by screws at the same time;

[0066] The sixth lens 46, the sixth and seventh lens spacers 39, and the seventh lens 47 are sequentially placed in the second reflector bracket 8, the sixth and seventh lens pressing rings 38 are connected to the second reflector bracket 8 by screws, and the sixth lens 46 and the seventh lens 47 are fixed in the second reflector bracket 8. At this time, the rear fixing group has been installed;

[0067] The second reflector 25 is placed in the second reflector frame 19 and fixed by glue at the glue injection hole on the back of the second reflector frame 19 to ensure that the reflector will not be damaged by stress in high and low temperature or vibration environment. The second reflector frame 19 is connected to the second reflector bracket 8 by screws to fix the second reflector frame 19 to the outside of the second reflector bracket 8;

[0068] The reflective shading tube 11 is connected to the reflector bracket 2 8 by screws, and then the reflective shading tube 11 is set in the limit hole of the reflector bracket 1 6, and then the reflector bracket 2 8 is connected to the whole machine bracket 3 by screws, and the reflector bracket 2 8 is fixed above the whole machine bracket 3 to ensure that the mirror group does not produce a large deviation during the vibration process to affect the imaging. At this time, the reflector group has been installed;

[0069] The lens adopts two reflectors, which can meet the optical design requirements and shorten the structural size. The first lens spacer 27 is installed in the first lens frame 1, and then the first lens 48 is installed in the first lens frame 1. The first lens frame 1 and the first lens pressing ring 33 are connected by threads, and the first lens 48 is fixed in the first lens frame 1, that is, the front fixing group installation is completed.

[0070] The first lens frame 1 is connected to the whole machine support 3 by screws, and the first lens frame 1 is fixed to the outside of the whole machine support 3;

[0071] The zoom motor 17 is fixed to the zoom motor bracket 20 by screws, the zoom motor 17 is installed in the reserved hole of the zoom motor gear 30, the zoom motor gear 30 and the zoom motor gear pressing block 31 are fixed by screws, the zoom motor gear 30 is meshed with the zoom cam barrel 29, and the zoom motor bracket 20 is fixed to the focusing lens barrel 5 by screws;

[0072] The zoom motor 17 drives the zoom cam barrel 29 to rotate, and drives the zoom lens group and the compensation lens group to move along the cam curve groove through the optical axis 28, so as to achieve a certain displacement of the zoom lens group and the compensation lens group along the axial direction, and realize continuous change of focal length;

[0073] The focusing motor 21 is fixed to the focusing motor bracket 12 by screws, the focusing motor 21 is installed in the reserved hole of the focusing motor gear 32, the focusing motor gear 32 and the focusing motor gear pressing block 10 are fixed by screws, the focusing motor gear 32 is meshed with the focusing cam barrel 7 gear, and the focusing motor bracket 12 is fixed to the main lens barrel bracket 9 by screws; the focusing motor assembly drives the focusing cam barrel 7 to rotate while making the focusing lens group move along the curved groove, so as to realize axial movement of the focusing lens to achieve clear imaging of high and low temperatures or targets at different distances, on the side of the lens close to the second reflector 25, the movement bracket 13 and the whole machine bracket 3 are connected by screws, and the movement bracket 13 is fixed to the whole machine bracket 3, and on the side of the lens close to the first reflector 24, the circuit board bracket 45 and the whole machine bracket 3 are connected by screws, and the circuit board bracket 45 is fixed to the whole machine bracket 3.

[0074] In this embodiment, the utility model adopts the form of a single slot for zooming and compensating plus a guide optical axis, which saves space and has good imaging stability. It adopts a linear bearing 50 plus a guide optical axis, has good motion performance, and the overall layout is very compact, and the overall volume is relatively small;

[0075] The utility model matches the single curvilinear groove for magnification and compensation on the cam barrel with the optical axis and the linear bearing 50, and drives the magnification lens group and the compensation lens group to move along the axial direction of the optical axis at the same time, so as to realize the continuous change of the focal length of the whole lens; the focusing motor assembly drives the focusing gear barrel to rotate and makes the focusing lens group move along the curvilinear groove, so as to realize the axial movement of the focusing lens, so as to realize the clear imaging of high and low temperature or different distance targets;

[0076] The utility model can realize 21X continuous zoom, and can satisfy the requirement that the lens has a stable imaging effect in a wide temperature range of -40° to +60°.

[0077] In addition, the contents not described in detail in this embodiment all belong to the scope of prior art and common knowledge.

[0078] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A large zoom ratio infrared continuous zoom lens, characterized by: The large zoom ratio infrared continuous zoom lens comprises a first lens frame (1), a focus guide pin (2), a whole machine support (3), a zoom lens barrel (4), a focus lens barrel (5), a first reflector support (6), a focus cam barrel (7), a second reflector support (8), a main lens barrel support (9), a focus motor gear pressing block (10), a reflective light shielding barrel (11), a focus motor support (12), a movement support (13), a zoom lens seat (14), a compensation lens seat (15), a zoom friction reducing gasket (16), a zoom motor (17), a first reflector pressing frame (18), a second reflector frame (19), a zoom motor support (20), a focus motor (21), a focus cam friction reducing gasket (22), a zoom pin (23), a first reflector (24), a second reflector (25), a focus lens seat (26), a first lens spacer (27), an optical axis (28) ), a zoom cam tube (29), a zoom motor gear (30), a zoom motor gear pressing block (31), a focus motor gear (32), a first lens pressing ring (33), a second lens pressing ring (34), a third lens pressing block (35), a fourth lens pressing ring (36), a fifth lens pressing ring (37), sixth and seventh lens pressing rings (38), sixth and seventh lens spacers (39), a zoom limit switch bracket (40), a zoom limit lever (41), a focus limit switch bracket (42), a focus limit lever (43), a fifth lens (44), a circuit board bracket (45), a sixth lens (46), a seventh lens (47), a first lens (48), a second lens (49), a third lens (50), a fourth lens (51), a linear bearing pressing block (52), a linear bearing spacer (53), and a linear bearing (54); A circle of steel balls is arranged in the outer groove at the bottom of the zoom lens barrel (4); the outer surface of the zoom lens barrel (4) and the inner surface of the zoom cam barrel (29) are subjected to rolling friction by the steel balls; the zoom limit lever (41) is fixed in a reserved hole of the zoom lens barrel (4) and is connected to the zoom lens barrel (4) by a thread; and a variable magnification friction reducing gasket (16) is arranged above the zoom cam barrel (29) and the steel balls; The zoom lens holder (14) and the second lens pressing ring (34) are connected by threads, the second lens (49) is fixed in the zoom lens holder (14), the optical axis (28) is arranged in a reserved hole of the zoom lens barrel (4), the zoom lens holder (14) is connected to the zoom lens barrel (4) by the optical axis (28), two linear bearings (54) are arranged at the bottom end of the optical axis (28), the two linear bearings (54) are connected by a linear bearing spacer (53), and the zoom lens holder (14) and the linear bearing pressing block (52) are connected by screws; The third lens (50) is fixed in the compensation lens seat (15) by screws between the third lens pressing block (35) and the compensation lens seat (15); the compensation lens seat (15) is connected to the zoom lens barrel (4) via an optical axis (28); and the compensation lens seat (15) is connected to the linear bearing pressing block (52) by screws; The focusing lens barrel (5) is connected to the zoom lens barrel (4) by screws, the focusing lens barrel (5) and the optical axis (28) are fixed by screws, the variable power pin (23) is fixed in a reserved hole of the focusing lens seat (26), and the variable power pin (23) and the focusing lens seat (26) are matched by threads; The fourth lens (51) is connected to the fourth lens pressing ring (36) via threads; A circle of steel balls is arranged around the outside of the bottom of the focusing cam tube (7), the focusing cam tube (7) is arranged outside the focusing lens tube (5), the fifth lens pressing ring (37) is connected to the focusing lens seat (26) by threads, and the fifth lens (44) is fixed in the focusing lens seat (26); The focusing lens seat (26) is arranged in the focusing lens barrel (5), the focusing guide pin (2) is arranged in a reserved hole of the focusing lens seat (26) and is connected to the focusing lens seat (26) through a thread, and the focusing limit lever (43) is arranged in the reserved hole of the focusing lens seat (26) and is connected to the focusing lens seat (26) through a thread; The focus limit switch bracket (42) and the focus lens barrel (5) are connected via screws; The zoom limit switch bracket (40) and the zoom lens barrel (4) are connected via screws; The first reflector (24) is arranged in the reflector bracket (6) and is connected to the reflector bracket (6) by screws; The reflector bracket 1 (6) is matched with the focusing cam tube (7) by means of screws; The zoom lens barrel (4) is connected to the main lens barrel bracket (9) by means of screws, and the main lens barrel bracket (9) and the focusing lens barrel (5) are fixed to the whole machine bracket (3) by means of screws; The sixth lens (46), the sixth and seventh lens spacers (39), and the seventh lens (47) are arranged in the second reflector bracket (8), and the sixth and seventh lens pressure rings (38) are connected to the second reflector bracket (8) by screws; The second reflector (25) is arranged in a second reflector frame (19), and the second reflector frame (19) is connected to the second reflector bracket (8) by screws; The reflective light-shielding tube (11) is arranged in the limiting hole of the reflector bracket 1 (6), the reflective light-shielding tube (11) is connected to the reflector bracket 2 (8) by screws, and the reflector bracket 2 (8) is connected to the whole machine bracket (3) by screws; The first lens spacer (27) is installed in the first lens frame (1), the first lens (48) is installed in the first lens frame (1), the first lens frame (1) and the first lens pressing ring (33) are connected by threads, and the first lens (48) is fixed in the first lens frame (1). The first mirror frame (1) is connected to the whole machine bracket (3) by means of screws; The zoom motor (17) is installed in a reserved hole of the zoom motor gear (30), the zoom motor (17) and the zoom motor bracket (20) are fixed by screws, the zoom motor gear (30) and the zoom motor gear pressing block (31) are fixed by screws, the zoom motor gear (30) and the zoom cam barrel (29) are gear-engaged and connected, and the zoom motor bracket (20) and the focusing lens barrel (5) are fixed by screws; The focus motor (21) is installed in a reserved hole of the focus motor gear (32), the focus motor (21) and the focus motor bracket (12) are fixed by screws, the focus motor gear (32) and the focus motor gear pressing block (10) are fixed by screws, the focus motor gear (32) and the focus cam barrel (7) are meshedly connected, and the focus motor bracket (12) and the main lens barrel bracket (9) are fixed by screws; On the side of the lens close to the second reflector (25), the movement bracket (13) and the whole machine bracket (3) are connected by screws, and on the side of the lens close to the first reflector (24), the circuit board bracket (45) and the whole machine bracket (3) are connected by screws.

2. The large zoom ratio infrared continuous zoom lens according to claim 1, characterized in that: The first lens (48) forms a front fixed group.

3. The large zoom ratio infrared continuous zoom lens according to claim 1, characterized in that: The second lens (49) forms a variable magnification lens group.

4. The large zoom ratio infrared continuous zoom lens according to claim 1, characterized in that: The third lens (50) forms a compensation lens group.

5. The large zoom ratio infrared continuous zoom lens according to claim 1, characterized in that: The fourth lens (51) forms a middle fixed group.

6. The large zoom ratio infrared continuous zoom lens according to claim 1, characterized in that: The fifth lens (44) forms a focusing lens group.

7. The large zoom ratio infrared continuous zoom lens according to claim 1, characterized in that: The first reflecting mirror (24) and the second reflecting mirror (25) form a reflecting mirror group.

8. The large zoom ratio infrared continuous zoom lens according to claim 1, characterized in that: The sixth lens (46) and the seventh lens (47) form a rear fixed group.

Images