Real-time zooming structure of infrared camera

Abstract

The invention discloses a real-time zooming structure of an infrared camera, and relates to the technical field of infrared cameras, the real-time zooming structure comprises a base, a front lens assembly, a zoom lens assembly, a compensation lens assembly and a correction lens assembly, the front lens assembly is fixed at the front end of the base through a screw; the zoom lens assembly is fixed at the rear end of the side wall of the base through a screw; the compensating mirror assembly is fixed to the middle end of the bottom of the base through a screw. The correction lens assembly is fixed to the rearmost end of the bottom of the base through a screw. The front lens assembly, the zoom lens assembly, the compensation lens assembly and the correction lens assembly are arranged on the same optical axis. The zoom lens assembly comprises a zoom lens lens, one end of the zoom lens lens is connected with a guide rail sliding block, the guide rail sliding block can move along a rolling guide rail, and the rolling guide rail is installed on a base. According to the invention, precise continuous zooming of the infrared camera is realized, the zooming efficiency is high, the image is stable in the zooming process, and the zoomed image is clear and has no ghost shadow.

Description

Technical Field

[0001] The invention relates to the technical field of infrared cameras, and in particular to a real-time zoom structure of an infrared camera. Background Art

[0002] Among the existing technologies, visible light earth observation is the most widely used and mature space remote sensing technology. The energy received by the visible light optical system comes from the reflection of visible light by the target object or the visible light emitted by the object itself, which makes visible light observation only possible when the target is in daytime and is greatly affected by the meteorological conditions in the target area. The infrared optical system receives infrared radiation energy from the target object itself, which overcomes the dependence of the visible light system on time and can work all day long. At the same time, due to the excellent penetration ability of long waves, the infrared system can observe in adverse weather conditions such as clouds and fog. With the preparation for military training and the modernization of weapons and equipment, security monitoring, industrial monitoring, and large-scale application of unmanned driving technology, the demand for infrared cameras is increasing.

[0003] At present, similar products on the market are mainly limited by the detector. The number and size of pixels of the detector will affect the imaging resolution. If the number of pixels is insufficient, after zooming, the image is magnified, and the actual scene range corresponding to each pixel becomes smaller, which will easily cause mosaic phenomenon and make the image look unclear. Moreover, the pixel response speed of the detector is also critical. If the response speed is slow, after zooming, the rapidly changing scene may cause the image to tail and produce residual images. Therefore, those skilled in the art provide a real-time zoom structure for an infrared camera to solve the problems raised in the above background technology. Summary of the invention

[0004] The present invention provides a real-time zoom structure for an infrared camera which can realize accurate continuous zooming of the infrared camera, high zooming efficiency, stable image during zooming, and clear image after zooming without residual image.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A real-time zoom structure of an infrared camera of the present invention comprises:

[0007] Pedestal;

[0008] A front lens assembly, wherein the front lens assembly is fixed to the front end of the base by screws;

[0009] A zoom lens assembly, wherein the zoom lens assembly is fixed to the rear end of the side wall of the base by screws;

[0010] A compensating mirror assembly, wherein the compensating mirror assembly is fixed to the middle end of the bottom of the base by screws;

[0011] A corrective lens assembly, wherein the corrective lens assembly is fixed to the rearmost end of the bottom of the base by screws;

[0012] The zoom lens assembly includes a rolling guide rail and a first ball screw drive motor arranged on a base, the rolling guide rail is provided with a guide rail slider that can move along its length direction, and the guide rail slider is connected to the zoom lens; the driving end of the first ball screw drive motor is connected to the first screw, and the first screw nut is provided on the first screw, and the first screw nut is connected to the zoom lens.

[0013] Furthermore, a first proximity switch is installed on one end of the first ball screw motor close to the first screw nut.

[0014] Furthermore, the compensating mirror assembly includes a compensating mirror lens, the compensating mirror lens and the zoom lens are arranged on the same optical axis, and the compensating mirror lens can move along the length direction of a first guide rail, and the first guide rail is installed on a base.

[0015] Furthermore, the compensating mirror lens is connected to a second lead screw nut, which can move along the length direction of the second lead screw. The second lead screw is arranged parallel to the first guide rail. The second lead screw is driven to rotate by a second ball screw motor, which can move along the length direction of the second guide rail. The motor seat of the second ball screw motor is connected to the first lead screw nut.

[0016] Furthermore, a second proximity switch is installed on the compensating mirror lens.

[0017] Furthermore, a third proximity switch is provided on the first guide rail and is located at the end of the compensating lens away from the zoom lens.

[0018] Furthermore, a fourth proximity switch is provided on the rolling guide rail and is located at the end of the zoom lens away from the compensation lens.

[0019] Furthermore, the corrective lens assembly includes a corrective lens, which is driven to rotate by a DC motor, and the DC motor is installed on the base through a motor seat. When the corrective lens is driven by the DC motor to rotate until the corrective lens, the compensation lens and the zoom lens are located on the same optical axis, the detector is blocked.

[0020] Furthermore, the front lens assembly includes a lens chamber, in which a plurality of coaxially arranged lenses are installed, the lenses located at the light input end and the light output end of the lens chamber are fixed by a pressing ring, and a prism is arranged on the outer wall of the lens chamber near the light input end.

[0021] In the above technical solution, the real-time zoom structure of an infrared camera provided by the present invention has the following beneficial effects:

[0022] 1. This application can achieve fast real-time zooming through the linkage of the zoom lens and the compensating lens, as well as fine-tuning of the compensating lens;

[0023] 2. The host computer sends a zoom command, and the first ball screw motor drives the zoom lens and the compensating lens assembly to move. During the movement, the image is still in an image state. In this dynamic process, the image may not be clear. The second ball screw motor drives the compensating lens to move and make fine adjustments to achieve clear imaging during the movement.

[0024] 3. A corrective lens assembly has been added to further improve image quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0026] Figure 1 A front view of a real-time zoom structure of an infrared camera provided in Example 1 of the present invention;

[0027] Figure 2 for Figure 1 A cross-sectional view of

[0028] Figure 3 for Figure 1 The front view of the medium zoom lens assembly;

[0029] Figure 4 for Figure 1 A front view of the middle compensating mirror assembly;

[0030] Figure 5 for Figure 4 A top view of

[0031] Figure 6 for Figure 1 A front view of the middle corrective lens assembly;

[0032] Figure 7 for Figure 1 Cross-sectional view of the center front lens assembly.

[0033] Description of reference numerals:

[0034] 10. Base;

[0035] 20. zoom lens; 21. guide rail slider; 22. rolling guide rail; 23. first lead screw nut; 24. first lead screw; 25. first ball screw motor; 26. first proximity switch; 27. fourth proximity switch;

[0036] 30. Compensating mirror lens; 31. First guide rail; 32. Second lead screw nut; 33. Second lead screw; 34. Second ball screw motor; 35. Second guide rail; 36. Second proximity switch; 37. Third proximity switch;

[0037] 40. Correction mirror; 41. DC motor; 42. Motor seat;

[0038] 50. Lens chamber; 51. Lens; 52. Pressure ring; 53. Prism. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0040] See also Figure 1-2 As shown;

[0041] The real-time zoom structure of an infrared camera described in Embodiment 1 of the present invention includes:

[0042] Base 10;

[0043] A front lens assembly, which is fixed to the front end of the base 10 by screws;

[0044] A zoom lens assembly, which is fixed to the rear end of the side wall of the base 10 by screws;

[0045] A compensating mirror assembly, wherein the compensating mirror assembly is fixed to the middle end of the bottom of the base 10 by screws;

[0046] A corrective lens assembly, wherein the corrective lens assembly is fixed to the rear end of the bottom of the base 10 by screws;

[0047] The zoom lens assembly includes a zoom lens 20, one end of which is connected to a guide rail slider 21. The guide rail slider 21 can move along a rolling guide rail 22. The rolling guide rail 22 is installed on a base 10. The rolling guide rail 22 uses a THK micro rolling guide.

[0048] During specific use, by adjusting the different positions of the zoom lens 20 on the rolling guide rail 22, the image of the detector can be continuously adjusted (the magnification can be adjusted) to improve the clarity of the image; the zoom lens 20 moves along the rolling guide rail 22, and the rolling guide rail 22 is fixed on the base 10, so the zoom lens can move smoothly, and the image can be stable and clear during the adjustment process.

[0049] See also Figure 1-3 As shown;

[0050] The zoom lens 20 is connected to a first lead screw nut 23, which can move along the length direction of a first lead screw 24. The first lead screw 24 is arranged parallel to the rolling guide rail 22. The first lead screw 24 is driven to rotate by a first ball screw motor 25. A first proximity switch 26 is installed on one end of the first ball screw motor 25 close to the first lead screw nut 23. The first ball screw motor 25 is installed on a base 10.

[0051] When the first ball screw motor 25 drives the first lead screw 24 to rotate clockwise, the first lead screw nut 23 drives the zoom lens 20 to move along the rolling guide 22 away from the first ball screw motor 25. When the first ball screw motor 25 drives the first lead screw 24 to rotate counterclockwise, the first lead screw nut 23 drives the zoom lens 20 to move along the rolling guide 22 toward the first ball screw motor 25. Since the first ball screw motor 25 is equipped with a first proximity switch 26, the movement range of the first lead screw nut 23 can be limited to avoid collision.

[0052] See also Figure 1-2 , as shown in 4-5;

[0053] The compensating mirror assembly includes a compensating mirror lens 30 , which is disposed on the same optical axis as the zoom lens 20 . The compensating mirror lens 30 can move along a length direction of a first guide rail 31 , which is mounted on the base 10 .

[0054] The compensating lens 30 is disposed on a side of the zoom lens 20 away from the front lens assembly. By adjusting the position of the compensating lens 30 on the first guide rail 31, compensation for focus deviation during zooming is achieved.

[0055] The compensating mirror lens 30 is connected to the second lead screw nut 32, and the second lead screw nut 32 can move along the length direction of the second lead screw 33. The second lead screw 33 is arranged parallel to the first guide rail 31. The second lead screw 33 is driven to rotate by the second ball screw motor 34. The second ball screw motor 34 can move along the length direction of the second guide rail 35. The motor seat of the second ball screw motor 34 is connected to the first lead screw nut 23.

[0056] The first ball screw motor 25 can drive the zoom lens 20 and the second ball screw motor 32 to move synchronously through the first screw nut 23, that is, to realize the synchronous movement of the zoom lens 20 and the compensating lens 30. After the overall movement to the predetermined position, the compensating lens 30 is driven to move along the first guide rail 31 by the second ball screw motor 34. When the second ball screw motor 34 drives the second screw 33 to rotate clockwise, the compensating lens 30 is driven to move along the first guide rail 31 away from the zoom lens 20 through the second screw nut 32. When the first ball screw motor 34 drives the first screw 33 to rotate counterclockwise, the compensating lens 30 is driven to move along the first guide rail 31 toward the zoom lens 20 through the first screw nut 32. Through the front and rear adjustment of the compensating lens 20, the imaging of the detector can be continuously adjusted (fine-tuned) to improve the clarity of the image.

[0057] The first guide rail 31 and the second guide rail 35 can both be THK micro rolling guide rails.

[0058] Furthermore, a second proximity switch 36 is installed on the compensating mirror lens 30 .

[0059] The second proximity switch 36 is provided to prevent the compensating lens 30 from colliding with the zoom lens 20 during movement.

[0060] A third proximity switch 37 is disposed on the first guide rail 31 and located at an end of the compensating lens 30 away from the variator lens 20 .

[0061] A fourth proximity switch 27 is disposed on the rolling guide rail 22 and located at the end of the zoom lens 20 away from the compensating lens 30 .

[0062] The first proximity switch 26, the second proximity switch 36, the third proximity switch 37 and the fourth proximity switch 27 are all photoelectric switches. By setting the third proximity switch 37 and the fourth proximity switch 27, it is possible to avoid collision between the compensating mirror lens 30 and the zoom lens 20 and other components during movement, that is, there will be no interference within the total stroke of the movement process.

[0063] See also Figure 1-2 , as shown in 6;

[0064] The corrective lens assembly includes a corrective lens 40, which is driven to rotate by a DC motor 41, and the DC motor 41 is installed on the base 10 through a motor seat 42. When the corrective lens 40 is driven by the DC motor 41 to rotate until the corrective lens 40, the compensating lens 30 and the zoom lens 20 are located on the same optical axis, the detector is blocked. The corrective lens 40 can be set outside the limited position of the zoom lens 20 and the compensating lens 30 to avoid the occurrence of collision with the zoom lens 20 and the compensating lens 30 during the rotation of the corrective lens.

[0065] The detector is arranged on the optical axis of the compensating lens 30, the zoom lens 20 and the correcting lens 10. When a ghost image appears on the detector image, the DC motor 41 rotates under the drive of the host computer and blocks the optical axis portion of the compensating lens 30 and the zoom lens 20, so that the detector presents a completely black image, and controls the host computer to perform background correction; at this time, the detector is equivalent to replacing a pure black background, which is background correction.

[0066] During the movement of the compensating lens 30 and the zoom lens 20, images will be presented on the detector. Some images will not change with the change of the lens position and will become ghost images, while images that do not move on the screen will disappear as ghost images. This part is judged by the algorithm.

[0067] See also Figure 1-2 , as shown in 7;

[0068] The front lens assembly includes a lens chamber 50, in which a plurality of coaxially arranged lenses 51 are installed. The lenses 51 located at the light input end and the light output end of the lens chamber 50 are fixed by a pressing ring 52. A prism 53 is arranged on the outer wall of the lens chamber 50 and near the light input end.

[0069] The present application can achieve fast real-time zooming through the linkage between the zoom lens 20 and the compensating lens 30, as well as the fine-tuning of the compensating lens 30; the host computer sends a zoom command, and the first ball screw motor 25 drives the zoom lens 20 and the compensating lens assembly to move, and during the movement, an imaging state is still maintained. In this dynamic process, unclear imaging may occur, and the compensating lens 30 is driven by the second ball screw motor 34 to move and perform fine-tuning to achieve clear imaging during the movement; at the same time, a corrective lens assembly is added to further improve the image quality.

[0070] The best usage state is that when the first ball screw motor 35 drives the zoom lens 20 and the compensating lens assembly to achieve focal length adjustment, the compensating lens assembly can quickly give feedback based on the image and adjust the position of the compensating lens 30 to achieve real-time zoom; at the same time, it can identify image "ghosts" with a time longer than the image is saved, and rotate the corrective lens.

[0071] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A real-time zoom structure of an infrared camera, characterized in that: include: Base (10); A front lens assembly, the front lens assembly being fixed to the front end of the base (10) by means of screws; A zoom lens assembly, wherein the zoom lens assembly is fixed to the rear end of the side wall of the base (10) by means of screws; A compensating mirror assembly, wherein the compensating mirror assembly is fixed to the middle end of the bottom of the base (10) by means of screws; A corrective lens assembly, wherein the corrective lens assembly is fixed to the rearmost end of the bottom of the base (10) by means of screws; The zoom lens assembly comprises a rolling guide rail (22) and a first ball screw drive motor (25) arranged on a base (10); the rolling guide rail (22) is provided with a guide rail slider (21) capable of moving along its length direction, and the guide rail slider is connected to the zoom lens (20); the driving end of the first ball screw drive motor (25) is connected to a first lead screw (24), a first lead screw nut (23) is provided on the first lead screw (24), and the first lead screw nut (23) is connected to the zoom lens (20).

2. The real-time zoom structure of an infrared camera according to claim 1, characterized in that: A first proximity switch (26) is installed on one end of the first ball screw motor (25) close to the first screw nut (23).

3. The real-time zoom structure of an infrared camera according to claim 1, characterized in that: The compensating mirror assembly comprises a compensating mirror lens (30), wherein the compensating mirror lens (30) and the zoom lens (20) are arranged on the same optical axis, and the compensating mirror lens (30) can move along the length direction of a first guide rail (31), wherein the first guide rail (31) is mounted on a base (10).

4. The real-time zoom structure of an infrared camera according to claim 3, characterized in that: The compensating mirror lens (30) is connected to a second lead screw nut (32), the second lead screw nut (32) can move along the length direction of a second lead screw (33), the second lead screw (33) is arranged in parallel with the first guide rail (31), the second lead screw (33) is driven to rotate by a second ball screw motor (34), the second ball screw motor (34) can move along the length direction of a second guide rail (35), and a motor seat of the second ball screw motor (34) is connected to the first lead screw nut (23).

5. The real-time zoom structure of an infrared camera according to claim 3, characterized in that: A second proximity switch (36) is mounted on the compensating mirror lens (30).

6. The real-time zoom structure of an infrared camera according to claim 3, characterized in that: A third proximity switch (37) is provided on the first guide rail (31) and is located at the end of the compensating lens (30) away from the zoom lens (20).

7. The real-time zoom structure of an infrared camera according to claim 6, characterized in that: A fourth proximity switch (27) is provided on the rolling guide rail (22) and is located at the end of the zoom lens (20) away from the compensation lens (30).

8. The real-time zoom structure of an infrared camera according to claim 1, characterized in that: The corrective lens assembly comprises a corrective lens (40), the corrective lens (40) is driven to rotate by a DC motor (41), and the DC motor (41) is mounted on a base (10) via a motor seat (42). When the corrective lens (40) is driven to rotate by the DC motor (41) until the corrective lens (40), the compensating lens (30) and the variable magnification lens (20) are located on the same optical axis, the detector is shielded.

9. The real-time zoom structure of an infrared camera according to claim 1, characterized in that: The front lens assembly comprises a lens chamber (50), wherein a plurality of coaxially arranged lenses (51) are installed in the lens chamber (50), the lenses (51) located at the light input end and the light output end of the lens chamber (50) are fixed by means of a pressing ring (52), and a prism (53) is arranged on the outer wall of the lens chamber (50) and close to the light input end.

Images