High-resolution infrared wavelength projection lens group

Abstract

The invention discloses a high-resolution infrared wavelength projection lens group which comprises a mounting shell, a combined lens seat is mounted in the mounting shell, and an outer protective cover is arranged on the outer side of the mounting shell. The combined lens seat comprises a positioning frame, a first projection lens arranged at the top of the inner side of the positioning frame, a second projection lens arranged at the top of the first projection lens, a third projection lens arranged at the bottom of the inner wall of the positioning frame, a fourth projection lens arranged at the bottom of the third projection lens and an optical filter arranged at the bottom of the fourth projection lens; the outer protective cover comprises an outer protective frame, an inner protective frame arranged in the outer protective frame and a buffer spring connected between the outer protective frame and the inner protective frame, according to the high-resolution infrared wavelength projection lens group, the whole lens is installed in a multi-clamping embedded mode, maintenance and replacement of the lens are facilitated, use is convenient, the working efficiency is improved, shock resistance and falling resistance are achieved, and the service life of the lens group is prolonged. The lens is not easy to impact and damage, the use strength is high, and the service life is prolonged.

Description

Technical Field

[0001] The invention relates to the field of infrared wavelength projection lens groups, in particular to a high-resolution infrared wavelength projection lens group. Background Art

[0002] External projection technology has a wide range of applications in military reconnaissance, night driving assistance, thermal imaging monitoring and other fields. An infrared wavelength projection lens group is a projection lens group specially designed for the infrared band, usually composed of multiple lenses, designed to optimize the imaging quality and performance of the infrared band. This lens group is mainly used in infrared imaging systems, such as thermal imagers, night vision devices, etc., and can provide high resolution and good sensing functions within the infrared spectrum. The design of the infrared wavelength projection lens group usually includes multiple lenses, each with specific optical properties. For example, the surface curvature, material and coating of the lens will affect the performance of the lens group. Common lens combinations include three-piece and four-piece structures, in which each lens is responsible for correcting different aberrations, such as spherical aberration and chromatic aberration, to ensure the imaging quality of the entire system.

[0003] The existing Chinese patent application number is CN201711119772.7, which discloses a three-piece infrared single-wavelength projection lens set, which includes, from the imaging side to the image source side, a first lens with positive refractive power; a second lens with refractive power; a third lens with positive refractive power; an aperture, which is arranged in front of the image source side surface of the first lens or between the image source side surface of the first lens and the image source side surface of the second lens; wherein one of the first lens or the second lens is made of glass. Thus, a three-piece infrared single-wavelength projection lens set with better image sensing function is realized.

[0004] The existing Chinese patent application number is CN201711119764.2, which discloses a two-piece infrared single-wavelength projection lens set, which includes, from the imaging side to the image source side, a first lens having positive refractive power, a convex surface on the imaging side near the optical axis, a concave surface on the image source side near the optical axis, and at least one of the imaging side surface and the image source side surface is aspherical; a second lens having positive refractive power, a concave surface on the imaging side near the optical axis, a convex surface on the image source side near the optical axis, and at least one of the imaging side surface and the image source side surface is aspherical; an aperture, which is arranged in front of the image source side surface of the first lens or between the image source side surface of the first lens and the imaging side surface of the second lens. Thus, a two-piece infrared single-wavelength projection lens set with better image sensing function is achieved.

[0005] During use of the high-resolution infrared wavelength projection lens group disclosed above, each lens is fixedly installed inside a lens shell. Subsequently, each lens is fixed, which is inconvenient to disassemble, repair and replace, thereby reducing the work efficiency of relevant personnel. In addition, during use, each lens lacks sufficient protection, and the lens group is easily damaged when it encounters knocks and collisions, thereby making the entire high-resolution infrared wavelength projection lens group unusable. Its usage intensity is far from meeting the requirements, shortening the service life of the equipment. Summary of the invention

[0006] The object of the present invention is to provide a high-resolution infrared wavelength projection lens group to solve the problem that the high-resolution infrared wavelength projection lens group proposed in the above background technology is that each lens is fixedly installed inside a lens shell during use, and each lens is subsequently fixed, which is inconvenient to disassemble, repair and replace, thereby reducing the work efficiency of relevant personnel. In addition, each lens lacks sufficient protection during use, and the lens group is easily damaged when it encounters knocks and collisions, thereby making the entire high-resolution infrared wavelength projection lens group unusable, and its use intensity is far from meeting the requirements, shortening the service life of the equipment.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-resolution infrared wavelength projection lens group, comprising a mounting shell, a combined lens seat is mounted inside the mounting shell, an outer shield is arranged on the outside of the mounting shell, the combined lens seat comprises a positioning frame, a first projection lens arranged on the top of the inner side of the positioning frame, a second projection lens arranged on the top of the first projection lens, a third projection lens arranged on the bottom of the inner wall of the positioning frame, a fourth projection lens arranged on the bottom of the third projection lens and a filter arranged on the bottom of the fourth projection lens, positioning slots are arranged on both sides of the inner wall of the mounting shell, positioning blocks are fixedly connected on both sides of the positioning frame, the positioning blocks are engaged with the positioning slots, and the The corners at the top of the positioning frame are fixedly connected with a pull rod, and the top of the pull rod is fixedly connected with a lifting block, the outer protective cover includes an outer protective frame, an inner protective frame arranged inside the outer protective frame and a buffer spring connected between the outer protective frame and the inner protective frame, and clamping frames are connected between the two sides of the inner wall of the outer protective frame and the two sides of the outer wall of the inner protective frame, and a protective airbag is installed in the middle of the clamping frame, and a plurality of reinforcement columns are connected to the middle of the front side of the outer protective cover and the middle of the back side of the outer protective cover, and a plurality of arc-shaped metal spring sheets are connected to the middle of the reinforcement columns, and a plurality of side blocking mechanisms are connected to both sides of the outer protective cover, and the side blocking mechanisms include a plastic plate, a rubber pad connected to one side of the plastic plate, and a plurality of buffer protrusions arranged on one side of the rubber pad.

[0008] Preferably, connecting pieces are connected between the first projection lens and the second projection lens, between the third projection lens and the fourth projection lens, and between the fourth projection lens and the filter, the surfaces of the first projection lens, the second projection lens, the third projection lens, and the fourth projection lens are connected with corrosion-resistant films, and the first projection lens, the second projection lens, the third projection lens, and the fourth projection lens are all snap-fitted to the inside of the positioning frame, and the tops of both sides of the mounting shell are fixedly connected with fixing plates, and the middle of the fixing plates is provided with fixing holes.

[0009] Preferably, a bottom sealing light-transmitting plate is hingedly connected to one side of the bottom of the combined lens seat, and a top sealing light-transmitting plate is hingedly connected to one side of the top of the combined lens seat, one side of the bottom sealing light-transmitting plate and one side of the top sealing light-transmitting plate are both connected to a limiting plate, the middle part of the limiting plate is threadedly connected to a limiting bolt, and the limiting bolt is threadedly connected to the surface of the positioning frame, and when the first projection lens, the second projection lens, the third projection lens and the fourth projection lens inside are disassembled and replaced, the limiting block inside the positioning slot is pulled out, and then the combined lens seat is lifted upward by the pull rod and the lifting block, and then the combined lens seat is moved as a whole to the outside of the mounting shell, and then the bottom sealing light-transmitting plates and the top sealing light-transmitting plates at the top and bottom of the combined lens seat are opened, and then the first projection lens, the second projection lens, the third projection lens, the fourth projection lens and the filter inside the positioning frame can be removed from the inside of the positioning frame.

[0010] Preferably, the top of the positioning slot is clamped with a limiting block, the top of the limiting block is fixedly connected to a limiting plate, a number of the reinforcement columns are evenly distributed, the outer side of the reinforcement column is connected with an outer cotton sleeve, the arc-shaped metal spring sheet is arranged on the outer side of the reinforcement column, the limiting plate is in contact with the top of the mounting shell, and the limiting plate is at the top of the positioning slot, the outer protective cover protects each lens through an outer protective frame, an inner protective frame and a buffer spring, and the buffer protection effect is improved by a protective airbag, arc-shaped metal spring sheets and side baffles are arranged on the front and back of the outer protective cover to improve the outer side drop resistance of the outer protective cover, and the anti-collision performance of the outer protective cover is improved under the outer side protection of the side baffle mechanism, thereby enhancing the protection effect of the outer protective cover.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] When the first projection lens, the second projection lens, the third projection lens and the fourth projection lens need to be disassembled and replaced during use, the limiting block inside the positioning slot is pulled out, and then the combined lens seat is pulled upward by the pull rod and the lifting block, and then the combined lens seat is moved as a whole to the outside of the installation shell, and then the bottom sealing light-transmitting plate and the top sealing light-transmitting plate at the top and bottom of the combined lens seat are opened, and then the first projection lens, the second projection lens, the third projection lens, the fourth projection lens and the filter inside the positioning frame can be removed from the positioning frame, and then new lenses can be replaced. The entire lens adopts a multi-card embedded installation, which is convenient for lens maintenance and replacement, easy to use, and improves work efficiency;

[0013] The first projection lens, the second projection lens, the third projection lens, the fourth projection lens and the filter are installed on the inner side of the positioning frame, and the outer side of the positioning frame is connected to the outer side of the positioning frame. The outer shield protects each lens through the outer shield, the inner shield and the buffer spring, and the buffer protection effect is improved by the protective airbag. Arc-shaped metal springs and side baffles are arranged on the front and back of the outer shield to improve the outer side drop resistance of the outer shield, and the anti-collision performance of the outer shield is improved under the outer side protection of the side baffle mechanism, thereby enhancing the protection effect of the outer shield, the lens is not easily damaged, the protection performance of the entire lens group is greatly improved, it is shock-resistant and drop-resistant, the lens is not easily damaged by impact, the use intensity is high, and the service life is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 It is a structural diagram of the combined lens holder of the present invention;

[0016] Figure 3 It is an enlarged structural diagram of A of the present invention;

[0017] Figure 4 It is an enlarged view of B of the present invention;

[0018] Figure 5 It is a top view of the structure of the outer shield of the present invention;

[0019] Figure 6 It is a structural diagram of the side stop mechanism of the present invention;

[0020] Figure 7 This is a diagram of the outer connection structure of the reinforcement column of the present invention.

[0021] In the figure: 1. mounting shell; 2. outer protective cover; 3. combined lens seat; 4. fixing plate; 5. fixing hole; 6. positioning frame; 7. first projection lens; 8. second projection lens; 9. third projection lens; 10. fourth projection lens; 11. filter; 12. connecting piece; 13. pull rod; 14. positioning card slot; 15. limiting block; 16. limiting plate; 17. lifting block; 18. positioning card block; 19. reinforcement column; 20. arc-shaped metal spring; 21. side blocking mechanism; 22. outer protective frame; 23. inner protective frame; 24. buffer spring; 25. clamping frame; 26. protective airbag; 27. plastic plate; 28. rubber pad; 29. ​​buffer bump; 30. bottom sealing light-transmitting plate; 31. top sealing light-transmitting plate; 32. limiting piece; 33. limiting bolt; 34. corrosion-resistant film; 35. outer cotton sleeve. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1-7 The present invention provides a high-resolution infrared wavelength projection lens group, comprising a mounting shell 1, a combined lens seat 3 is mounted inside the mounting shell 1, an outer protective cover 2 is arranged outside the mounting shell 1, the combined lens seat 3 comprises a positioning frame 6, a first projection lens 7 arranged at the top of the inner side of the positioning frame 6, a second projection lens 8 arranged at the top of the first projection lens 7, a third projection lens 9 arranged at the bottom of the inner wall of the positioning frame 6, a fourth projection lens 10 arranged at the bottom of the third projection lens 9 and a filter 11 arranged at the bottom of the fourth projection lens 10, positioning slots 14 are arranged on both sides of the inner wall of the mounting shell 1, positioning blocks 18 are fixedly connected to both sides of the positioning frame 6, the positioning blocks 18 are clamped with the positioning slots 14, and the corners at the top of the positioning frame 6 are fixedly connected to pull rods 1 3. A lifting block 17 is fixedly connected to the top of the pull rod 13. The outer protective cover 2 includes an outer protective frame 22, an inner protective frame 23 arranged inside the outer protective frame 22, and a buffer spring 24 connected between the outer protective frame 22 and the inner protective frame 23. A clamping frame 25 is connected between the two sides of the inner wall of the outer protective frame 22 and the two sides of the outer wall of the inner protective frame 23. A protective airbag 26 is installed in the middle of the clamping frame 25. A plurality of reinforcing columns 19 are connected to the middle of the front of the outer protective cover 2 and the middle of the back of the outer protective cover 2. A plurality of arc-shaped metal springs 20 are connected to the middle of the reinforcing columns 19. A plurality of side blocking mechanisms 21 are connected to both sides of the outer protective cover 2. The side blocking mechanisms 21 include a plastic plate 27, a rubber pad 28 connected to one side of the plastic plate 27, and a plurality of buffering protrusions 29 arranged on one side of the rubber pad 28.

[0024] In this embodiment, the first projection lens 7 is made of high-transmittance infrared material, and its front surface is convex and its rear surface is concave, which is used to initially focus the infrared light and reduce chromatic aberration. The second projection lens 8 is made of low-dispersion infrared material, and its front surface is concave and its rear surface is convex, which is used to further focus the infrared light and correct chromatic aberration. The third projection lens 9 is made of high-refractive-index infrared material, and its front surface is convex and its rear surface is flat or slightly concave, which is used to enhance the focusing effect of infrared light and improve the resolution. The fourth projection lens 10 is made of infrared material with a special coating process, and its front and rear surfaces are both aspherical, which is used to correct distortion and improve image quality. The filter 11 is located at the rear end of the lens group, and is used to filter out light of non-infrared wavelengths to improve the purity and contrast of infrared projection.

[0025] See also Figure 1-7 , a connecting piece 12 is connected between the first projection lens 7 and the second projection lens 8, between the third projection lens 9 and the fourth projection lens 10, and between the fourth projection lens 10 and the filter 11, and a corrosion-resistant film 34 is connected to the surface of the first projection lens 7, the surface of the second projection lens 8, the surface of the third projection lens 9, and the surface of the fourth projection lens 10, and the first projection lens 7, the second projection lens 8, the third projection lens 9, and the fourth projection lens 10 are all clamped with the inside of the positioning frame 6, and the tops of both sides of the installation shell 1 are fixedly connected with fixing plates 4, and the middle of the fixing plates 4 is provided with fixing holes 5;

[0026] In this embodiment, during use, the entire mounting shell 1 is installed to the position where the lens group needs to be installed. When the first projection lens 7, the second projection lens 8, the third projection lens 9 and the fourth projection lens 10 inside need to be disassembled and replaced during use, the limiting block 15 inside the positioning slot 14 is pulled out, and then the combined lens seat 3 is pulled upward by the pull rod 13 and the lifting block 17, and then the combined lens seat 3 is moved as a whole to the outside of the mounting shell 1, and then the bottom sealing light-transmitting plate 30 and the top sealing light-transmitting plate 31 at the top and bottom of the combined lens seat 3 are opened, and then the first projection lens 7, the second projection lens 8, the third projection lens 9, the fourth projection lens 10 and the filter 11 inside the positioning frame 6 can be removed from the inside of the positioning frame 6, and then new lenses can be replaced. The entire lens adopts a multi-card embedded installation, which is convenient for lens maintenance and replacement.

[0027] See also Figure 1-7, a bottom sealing light-transmitting plate 30 is hinged on one side of the bottom of the combined lens seat 3, a top sealing light-transmitting plate 31 is hinged on one side of the top of the combined lens seat 3, one side of the bottom sealing light-transmitting plate 30 and one side of the top sealing light-transmitting plate 31 are both connected to a limiting plate 32, the middle part of the limiting plate 32 is threadedly connected to a limiting bolt 33, the limiting bolt 33 is threadedly connected to the surface of the positioning frame 6, the top of the positioning slot 14 is clamped with a limiting block 15, the top of the limiting block 15 is fixedly connected to the limiting plate 16, a plurality of reinforcement columns 19 are evenly distributed, the outer side of the reinforcement column 19 is connected to an outer cotton sleeve 35, the arc-shaped metal spring sheet 20 is arranged on the outer side of the reinforcement column 19, the limiting plate 16 is in contact with the top of the mounting shell 1, and the limiting plate 16 is at the top of the positioning slot 14;

[0028] In this embodiment, the first projection lens 7, the second projection lens 8, the third projection lens 9, the fourth projection lens 10 and the filter 11 are installed on the inner side of the positioning frame 6, and the outer side of the positioning frame 6 is connected to the outer side of the outer protective cover 2. The outer protective cover 2 protects each lens through the outer protective frame 22, the inner protective frame 23 and the buffer spring 24, and improves the buffer protection effect through the protective airbag 26. The front and back sides of the outer protective cover 2 are provided with arc-shaped metal spring pieces 20 and side blocking mechanisms 21 to improve the outer side drop resistance of the outer protective cover 2, and improve the anti-collision performance of the outer protective cover 2 under the outer side protection of the side blocking mechanism 21. The side blocking mechanism 21 buffers the impact of the outside on both sides of the outer protective cover 2 through the plastic plate 27, the rubber pad 28 and the buffer protrusion 29, thereby reducing the impact force on the outer protective cover 2, and thereby reducing the impact force on the mounting shell 1.

[0029] When in use, the high-resolution infrared wavelength projection lens group of the present invention can be installed in the entire installation shell 1 to the position where the lens group needs to be installed during use. When the first projection lens 7, the second projection lens 8, the third projection lens 9 and the fourth projection lens 10 inside need to be disassembled and replaced during use, the limiting block 15 inside the positioning slot 14 is pulled out, and then the combined lens seat 3 is pulled upward by the pull rod 13 and the lifting block 17, and then the combined lens seat 3 is moved as a whole to the outside of the installation shell 1, and then the bottom sealing light-transmitting plate 30 and the top sealing light-transmitting plate 31 at the top and bottom of the combined lens seat 3 are opened, and then the first projection lens 7, the second projection lens 8, the third projection lens 9, the fourth projection lens 10 and the filter 11 inside the positioning frame 6 can be removed from the inside of the positioning frame 6, and then new lenses can be replaced. The entire lens adopts a multi-card embedded installation, which is convenient for lens maintenance and replacement, easy to use, and improves work efficiency.

[0030] In addition, during use, the first projection lens 7, the second projection lens 8, the third projection lens 9, the fourth projection lens 10 and the filter 11 are installed on the inner side of the positioning frame 6, and the outer side of the positioning frame 6 is connected to the outer side of the outer protective cover 2. The outer protective cover 2 protects each lens through the outer protective frame 22, the inner protective frame 23 and the buffer spring 24, and the buffer protection effect is improved by the protective airbag 26. The front and back sides of the outer protective cover 2 are provided with arc-shaped metal springs 20 and side blocking mechanisms 21 to improve the outer side drop resistance of the outer protective cover 2, and the anti-collision performance of the outer protective cover 2 is improved under the outer side protection of the side blocking mechanism 21, thereby enhancing the protection effect of the outer protective cover 2, so that the first projection lens 7, the second projection lens 8, the third projection lens 9 and the fourth projection lens 10 are not easily damaged, and the protection performance of the entire lens group is greatly improved, which is shock-resistant and drop-resistant, and the lenses are not easily damaged by impact. The use strength is high and the service life is extended.

[0031] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-resolution infrared wavelength projection lens assembly, comprising a mounting housing (1), characterized in that: A combined lens seat (3) is installed inside the mounting shell (1), an outer protective cover (2) is provided on the outer side of the mounting shell (1), the combined lens seat (3) comprises a positioning frame (6), a first projection lens (7) arranged at the top of the inner side of the positioning frame (6), a second projection lens (8) arranged at the top of the first projection lens (7), a third projection lens (9) arranged at the bottom of the inner wall of the positioning frame (6), a fourth projection lens (10) arranged at the bottom of the third projection lens (9), and a filter (11) arranged at the bottom of the fourth projection lens (10), positioning grooves (14) are provided on both sides of the inner wall of the mounting shell (1), positioning blocks (18) are fixedly connected to both sides of the positioning frame (6), and the positioning blocks (18) are clamped with the positioning grooves (14), and the corners of the top of the positioning frame (6) are fixedly connected to pull rods (13), and the top of the pull rods (13) are fixedly connected to the The outer protective cover (2) comprises an outer protective frame (22), an inner protective frame (23) arranged inside the outer protective frame (22), and a buffer spring (24) connected between the outer protective frame (22) and the inner protective frame (23). A clamping frame (25) is connected between the two sides of the inner wall of the outer protective frame (22) and the two sides of the outer wall of the inner protective frame (23). A protective airbag (26) is installed in the middle of the clamping frame (25). The outer protective cover (2) is A plurality of reinforcing columns (19) are connected to the middle of the front surface and the middle of the back surface of the outer shield (2), a plurality of arc-shaped metal spring sheets (20) are connected to the middle of the reinforcing columns (19), and a plurality of side blocking mechanisms (21) are connected to both sides of the outer shield (2), and the side blocking mechanisms (21) include a plastic plate (27), a rubber pad (28) connected to one side of the plastic plate (27), and a plurality of buffer protrusions (29) arranged on one side of the rubber pad (28).

2. A high-resolution infrared wavelength projection lens assembly according to claim 1, characterized in that: A connecting piece (12) is connected between the first projection lens (7) and the second projection lens (8), between the third projection lens (9) and the fourth projection lens (10), and between the fourth projection lens (10) and the filter (11).

3. The high-resolution infrared wavelength projection lens assembly according to claim 1, characterized in that: The surface of the first projection lens (7), the surface of the second projection lens (8), the surface of the third projection lens (9) and the surface of the fourth projection lens (10) are all connected with a corrosion-resistant film (34), and the first projection lens (7), the second projection lens (8), the third projection lens (9) and the fourth projection lens (10) are all snap-fitted to the inside of the positioning frame (6).

4. The high-resolution infrared wavelength projection lens assembly according to claim 1, characterized in that: The tops of both sides of the installation shell (1) are fixedly connected with fixing plates (4), and a fixing hole (5) is provided in the middle of the fixing plate (4).

5. The high-resolution infrared wavelength projection lens assembly according to claim 1, characterized in that: A bottom sealing light-transmitting plate (30) is hingedly connected to one side of the bottom of the combined lens seat (3), and a top sealing light-transmitting plate (31) is hingedly connected to one side of the top of the combined lens seat (3). One side of the bottom sealing light-transmitting plate (30) and one side of the top sealing light-transmitting plate (31) are both connected to a limiting plate (32). The middle part of the limiting plate (32) is threadedly connected to a limiting bolt (33), and the limiting bolt (33) is threadedly connected to the surface of the positioning frame (6).

6. The high-resolution infrared wavelength projection lens assembly according to claim 1, characterized in that: The top of the positioning slot (14) is clamped with a limiting block (15), and the top of the limiting block (15) is fixedly connected with a limiting plate (16).

7. The high-resolution infrared wavelength projection lens assembly according to claim 1, characterized in that: The plurality of reinforcement columns (19) are evenly distributed, the outer sides of the reinforcement columns (19) are connected to outer cotton sleeves (35), and the arc-shaped metal spring sheets (20) are arranged on the outer sides of the reinforcement columns (19).

8. The high-resolution infrared wavelength projection lens assembly according to claim 6, characterized in that: The limiting plate (16) is in contact with the top end of the mounting shell (1), and the limiting plate (16) is located at the top of the positioning slot (14).

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