A see-through lens

Abstract

The application discloses a kind of mist lenses, including lens barrel, front fixed group, zoom group, compensation group, rear fixed group and switching mechanism;The front fixed group, the zoom group, the compensation group and the rear fixed group are sequentially arranged along the axial direction of the lens barrel;The zoom group includes second concave lens and positive and negative double cemented lens group;The compensation group is a positive and negative positive three cemented lens group;The rear fixed group is third concave lens;The switching mechanism is connected with the shaft, and is used to drive the shaft to rotate, so that the infrared filter or the visible light filter is rotated to the axis of the lens barrel.The beneficial effects of the technical scheme proposed in the application are: the lens can be freely switched to infrared imaging mode or visible light imaging mode, which can ensure to provide mist vision in heavy fog environment, and also can ensure to provide color vision in normal weather conditions.

Description

Technical Field

[0001] This invention relates to the field of optical imaging technology, and in particular to a fog-penetrating lens. Background Technology

[0002] A fog-penetrating lens refers to a lens with extremely high transmittance of long-wavelength light (700nm-950nm) in the infrared field, and simultaneously possesses the ability to control the imaging surface (camera CCD target surface) of this high-wavelength light. By using such a lens, even in adverse conditions such as fog, dust, smoke, and light rain—environments requiring ordinary lenses to produce only blurry images and significantly reducing the effective observation distance—very clear, high-contrast black-and-white images can be captured, thus improving the long-distance observation effect in harsh environments.

[0003] In non-foggy environments, visible light imaging can better reflect environmental information and obtain high-definition color images. However, in existing technologies (such as the invention patent with application number CN201610762050.2), fog-penetrating lenses cannot be switched to visible light imaging mode during use, so they can only acquire black and white images and cannot select the imaging mode according to the environmental conditions. Summary of the Invention

[0004] In view of this, it is necessary to provide a fog-penetrating lens to solve the technical problem that existing fog-penetrating lenses cannot switch to visible light imaging mode, can only acquire black and white images, and cannot select the imaging mode according to environmental conditions.

[0005] To achieve the above objectives, the present invention provides a fog-penetrating lens, comprising a lens barrel, a front fixing group, a zoom group, a compensation group, a rear fixing group, and a switching mechanism.

[0006] The front fixing group, the zoom group, the compensation group, and the rear fixing group are arranged sequentially along the axial direction of the lens barrel. The front fixing group includes a protective glass, a first concave lens, a rotating shaft, an infrared filter, and a visible light filter. The front protective glass is fixed to the front end of the lens barrel, the first concave lens is fixed inside the lens barrel, the rotating shaft is rotatably disposed inside the lens barrel and parallel to the axial direction of the lens barrel, and the infrared filter and the visible light filter are respectively fixed on both sides of the rotating shaft.

[0007] The zoom group includes a second concave lens and a positive and negative cemented doublet lens group. The second concave lens is movably disposed inside the lens barrel, and the positive and negative cemented doublet lens group is fixed to the rear side of the second concave lens.

[0008] The compensation group is a positive-negative-positive triplet lens group, which is movably disposed inside the lens barrel;

[0009] The rear fixing assembly is a third concave lens, which is fixed inside the lens barrel;

[0010] The switching mechanism is connected to the rotating shaft and is used to drive the rotating shaft to rotate so that the infrared filter or the visible light filter rotates to the axis of the lens barrel.

[0011] In some embodiments, the switching mechanism includes a micro motor connected to the rotating shaft and used to drive the rotating shaft to rotate.

[0012] In some embodiments, a first protective shell communicating with the lens barrel is also fixed on the lens barrel, and the housing of the micro motor is fixed inside the first protective shell.

[0013] In some embodiments, the switching mechanism further includes a power shaft, a drive gear, and a driven gear. The power shaft is rotatably disposed within the first protective housing. The drive gear is fixedly sleeved on the power shaft. The driven gear is fixedly sleeved on the rotating shaft and meshes with the drive gear. The output shaft of the micro motor is coaxially and fixedly connected to the power shaft.

[0014] In some embodiments, the switching mechanism further includes a bearing, the inner ring of which is fixedly sleeved on one end of the power shaft, and the outer ring of which is fixed to the inner sidewall of the first protective shell.

[0015] In some embodiments, the switching mechanism further includes a support plate, which is fixed inside the first protective shell. The support plate has a first through hole, and the other end of the power shaft is rotatably inserted into the first through hole.

[0016] In some embodiments, a second support plate and a third support plate are fixed on the inner sidewall of the lens barrel, and the two ends of the rotating shaft are rotatably connected to the second support plate and the third support plate, respectively.

[0017] In some embodiments, a second protective shell that communicates with the lens barrel is also fixed on the lens barrel, and is always located inside the lens barrel or the second protective shell when the infrared filter or the visible light filter rotates.

[0018] In some embodiments, the fog-penetrating lens further includes an image sensor, which is fixed inside the lens barrel, and the receiving end of the image sensor is located on the imaging surface.

[0019] In some embodiments, the fog-penetrating lens further includes a processor electrically connected to both the image sensor and the switching mechanism. The processor sends instructions to the switching mechanism to sequentially rotate the infrared filter and the visible light filter onto the axis of the lens barrel. The image sensor receives the images filtered by the infrared filter and the visible light filter, respectively, thereby obtaining a first image filtered by the infrared filter and a second image filtered by the visible light filter. The processor extracts a first object contour from the first image. Then, the processor performs grayscale processing on the second image and extracts a second object contour from the grayscale processed second image. The first object contour and the second object contour are then compared. If the similarity exceeds a preset value, the environment is determined to be non-foggy. The visible light filter is then rotated onto the axis of the lens barrel via the switching mechanism for color image acquisition. If the similarity does not exceed a preset value, the environment is determined to be foggy. The infrared filter is then rotated onto the axis of the lens barrel via the switching mechanism for fog-penetrating image acquisition.

[0020] Compared with the prior art, the beneficial effects of the technical solution proposed in this invention are as follows: In use, when the fog-penetrating function is required, the infrared filter is rotated to the axis of the lens barrel via a switching mechanism. At this time, external light sequentially passes through the protective glass, the infrared filter, the first concave lens, the second concave lens, the positive and negative cemented doublet lens group, the positive and negative positive triplet lens group, and the third concave lens before finally reaching the imaging surface. When passing through the infrared filter, all wavelengths of light except infrared light are filtered out, thus ultimately obtaining a black-and-white fog-penetrating image. When the fog dissipates, the visible light is filtered out via the switching mechanism. When the light plate rotates to the axis of the lens barrel, external light sequentially passes through the protective glass, visible light filter, first concave lens, second concave lens, positive and negative cemented doublet lens group, positive and negative positive triplet lens group, and third concave lens to finally reach the imaging surface. When passing through the visible light filter, all wavelengths of light other than visible light are filtered out, so a clean color image can be obtained. Thus, through this invention, the lens can be freely switched between infrared imaging mode and visible light imaging mode, which can ensure that fog-penetrating images are provided in foggy environments and color images are provided in normal weather conditions. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the optical path of an embodiment of the fog-penetrating lens provided by the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of an embodiment of the fog-penetrating lens provided by the present invention;

[0023] Figure 3 yes Figure 2 A magnified view of a portion of region A in the middle;

[0024] In the diagram: 1-lens barrel, 11-first protective shell, 12-second support plate, 13-third support plate, 14-second protective shell, 2-front fixing group, 21-protective glass, 22-first concave lens, 23-rotating shaft, 24-infrared filter, 25-visible light filter, 3-magnification group, 31-second concave lens, 32-positive and negative cemented doublet lens group, 4-compensation group, 41-positive and negative triplet lens group, 5-rear fixing group, 51-third concave lens, 6-switching mechanism, 61-micro motor, 62-power shaft, 63-drive gear, 64-driven gear, 65-bearing, 66-support plate, 7-image sensor. Detailed Implementation

[0025] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0026] Please refer to Figures 1-3 The present invention provides a fog-penetrating lens, comprising a lens barrel 1, a front fixing group 2, a zoom group 3, a compensation group 4, a rear fixing group 5, and a switching mechanism 6.

[0027] The front fixing group 2, the zoom group 3, the compensation group 4, and the rear fixing group 5 are arranged sequentially along the axial direction of the lens barrel 1. The front fixing group 2 includes a protective glass 21, a first concave lens 22, a rotating shaft 23, an infrared filter 24, and a visible light filter 25. The front protective glass 21 is fixed to the front end of the lens barrel 1, the first concave lens 22 is fixed inside the lens barrel 1, the rotating shaft 23 is rotatably disposed inside the lens barrel 1 and parallel to the axial direction of the lens barrel 1, and the infrared filter 24 and the visible light filter 25 are respectively fixed on both sides of the rotating shaft 23.

[0028] The zoom group 3 includes a second concave lens 31 and a positive and negative cemented doublet lens group 32. The second concave lens 31 is movably disposed inside the lens barrel 1, and the positive and negative cemented doublet lens group 32 is fixed to the rear side of the second concave lens 31.

[0029] The compensation group 4 is a positive-negative-positive triplet lens group 41, which is movably disposed inside the lens barrel 1. In use, the focal length of the fog-penetrating lens can be adjusted by adjusting the positions of the zoom group 3 and the compensation group 4.

[0030] The rear fixing group 5 is a third concave lens 51, and the third concave lens 51 is fixed inside the lens barrel 1;

[0031] The switching mechanism 6 is connected to the rotating shaft 23 and is used to drive the rotating shaft 23 to rotate so that the infrared filter 24 or the visible light filter 25 rotates to the axis of the lens barrel 1.

[0032] In use, when fog-penetrating functionality is required, the infrared filter 24 is rotated to the axis of the lens barrel 1 via the switching mechanism 6. At this time, external light sequentially passes through the protective glass 21, the infrared filter 24, the first concave lens 22, the second concave lens 31, the positive and negative cemented doublet lens group 32, the positive and negative positive triplet lens group 41, and the third concave lens 51 before finally reaching the imaging surface. When passing through the infrared filter 24, all wavelengths of light except infrared light are filtered out, thus resulting in a black-and-white fog-penetrating image. When the fog dissipates, the visible light filter 25 is rotated to the axis of the lens barrel via the switching mechanism 6. On axis 1, at this time, external light passes sequentially through protective glass 21, visible light filter 25, first concave lens 22, second concave lens 31, positive and negative cemented doublet lens group 32, positive and negative positive triplet lens group 41 and third concave lens 51 to finally reach the imaging surface. When passing through visible light filter 25, all wavelengths of light except visible light are filtered out, so a clean color image can be obtained. Thus, through this invention, the lens can be freely switched to infrared imaging mode or visible light imaging mode, which can ensure that fog-penetrating images are provided in foggy environments and that color images are provided in normal weather conditions.

[0033] To understand the specific functions of switching mechanism 6, please refer to [link / reference]. Figure 2 and Figure 3 In a preferred embodiment, the switching mechanism 6 includes a micro motor 61, which is connected to the rotating shaft 23 and is used to drive the rotating shaft 23 to rotate.

[0034] For protection of the miniature motor 61, please refer to... Figure 2 and Figure 3 In a preferred embodiment, a first protective shell 11 communicating with the lens barrel 1 is also fixed on the lens barrel 1, and the housing of the micro motor 61 is fixed inside the first protective shell 11.

[0035] To specifically implement the connection between the micro motor 61 and the rotating shaft 23, please refer to... Figure 2 and Figure 3 In a preferred embodiment, the switching mechanism 6 further includes a power shaft 62, a drive gear 63, and a driven gear 64. The power shaft 62 is rotatably disposed within the first protective shell 11. The drive gear 63 is fixedly sleeved on the power shaft 62. The driven gear 64 is fixedly sleeved on the rotating shaft 23 and meshes with the drive gear 63. The output shaft of the micro motor 61 is coaxially and fixedly connected to the power shaft 62.

[0036] To specifically achieve the rotational arrangement of the power shaft 62 within the first protective housing 11, please refer to... Figure 2 and Figure 3 In a preferred embodiment, the switching mechanism 6 further includes a bearing 65, the inner ring of which is fixedly sleeved on one end of the power shaft 62, and the outer ring of which is fixed on the inner sidewall of the first protective shell 11.

[0037] To further improve the stability of the drive shaft 62, please refer to... Figure 2 and Figure 3 In a preferred embodiment, the switching mechanism 6 further includes a support plate 66, which is fixed inside the first protective shell 11. The support plate 66 has a first through hole, and the other end of the power shaft 62 is rotatably inserted into the first through hole.

[0038] To specifically implement the rotation of the pivot 23 within the lens barrel 1, please refer to... Figure 2 and Figure 3 In a preferred embodiment, a second support plate 12 and a third support plate 13 are also fixed on the inner sidewall of the lens barrel 1, and the two ends of the rotating shaft 23 are rotatably connected to the second support plate 12 and the third support plate 13 respectively.

[0039] To protect the infrared filter 24 or the visible light filter 25, please refer to... Figure 2 and Figure 3 In a preferred embodiment, a second protective shell 14 communicating with the lens barrel 1 is also fixed on the lens barrel 1. When the infrared filter 24 or the visible light filter 25 rotates, it is always located inside the lens barrel 1 or the second protective shell 14.

[0040] For easier imaging, please refer to Figure 2 and Figure 3 In a preferred embodiment, the defogging lens further includes an image sensor 7, which is fixed inside the lens barrel 1, and the receiving end of the image sensor 7 is located on the imaging surface. In this embodiment, the image sensor 7 is a wide-area image sensor, which can image in both the red light band and the visible light band.

[0041] To automatically switch between fog-penetrating imaging and color imaging, please refer to... Figure 2 and Figure 3In a preferred embodiment, the defogging lens further includes a processor, which is electrically connected to the image sensor 7 and the switching mechanism 6 (a miniature motor 61 in this embodiment). The processor sends commands to the switching mechanism 6 to sequentially rotate the infrared filter 24 and the visible light filter 25 onto the axis of the lens barrel 1. The image sensor 7 receives the images filtered by the infrared filter 24 and the visible light filter 25, respectively, thereby obtaining a first image filtered by the infrared filter 24 and a second image filtered by the visible light filter 25. The processor extracts the image from the first image. The processor first extracts the object outline from the first image, then performs grayscale processing on the second image, and extracts the second object outline from the grayscale processed second image. The processor then compares the first object outline with the second object outline. If the similarity exceeds a preset value, the environment is determined to be non-foggy. At this time, the visible light filter 25 is rotated to the axis of the lens barrel 1 via the switching mechanism 6 to acquire a color image. If the similarity does not exceed a preset value, the environment is determined to be foggy. At this time, the infrared filter 24 is rotated to the axis of the lens barrel 1 via the switching mechanism 6 to acquire a fog-penetrating image, thus enabling automatic switching between fog-penetrating imaging and color imaging.

[0042] The specific method for extracting the object contour from the image is as follows:

[0043] 1) Use a Gaussian filter to process the image to smooth it and remove noise;

[0044] 2) Calculate the gradient intensity and direction of each pixel in the image;

[0045] 3) Apply nonmaximum suppression to eliminate stray responses caused by edge detection;

[0046] 4) Apply dual threshold detection to determine real and potential edges;

[0047] 5) Edge detection is finally completed by suppressing isolated weak edges.

[0048] The method for comparing the first and second object contours to obtain the similarity is as follows:

[0049] 1) Project the first and second object contours onto a unified rectangular coordinate system;

[0050] 2) Collect the first coordinate set of data points on the first object contour and the second coordinate set of data points on the second object contour according to a certain sampling density;

[0051] 3) For each coordinate point in the first coordinate set, obtain the distance between the nearest coordinate point in the second coordinate set and the coordinate point (called the minimum distance). Sum the minimum distances of each coordinate point in the first coordinate set to obtain the minimum distance sum. Based on the minimum distance sum, determine the similarity between the first object contour and the second object contour.

[0052] To better understand this invention, the following is combined with... Figures 1-3 The working process of the fog-penetrating lens provided by the present invention will be described in detail below: In use, when fog-penetrating functionality is required, the infrared filter 24 is rotated to the axis of the lens barrel 1 via the switching mechanism 6. At this time, external light sequentially passes through the protective glass 21, the infrared filter 24, the first concave lens 22, the second concave lens 31, the positive and negative cemented doublet lens group 32, the positive and negative positive triplet lens group 41, and the third concave lens 51 before finally reaching the imaging surface. When passing through the infrared filter 24, all wavelengths of light except infrared light are filtered out, thus ultimately obtaining a black-and-white fog-penetrating image. When the fog dissipates, the visible light is switched back to the image through the switching mechanism 6. When the filter 25 is rotated to the axis of the lens barrel 1, the external light passes through the protective glass 21, the visible light filter 25, the first concave lens 22, the second concave lens 31, the positive and negative cemented doublet lens group 32, the positive and negative positive triplet lens group 41, and the third concave lens 51 in sequence to finally reach the imaging surface. When passing through the visible light filter 25, all wavelengths of light other than visible light are filtered out, so a clean color image can be obtained. Thus, through this invention, the lens can be freely switched between infrared imaging mode and visible light imaging mode, which can ensure that fog-penetrating images are provided in foggy environments and that color images are provided in normal weather conditions.

[0053] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A fog-penetrating lens, characterized in that, It includes the lens barrel, front fixation group, zoom group, compensation group, rear fixation group, and switching mechanism; The front fixing group, the zoom group, the compensation group, and the rear fixing group are arranged sequentially along the axial direction of the lens barrel. The front fixing group consists of a protective glass, a first concave lens, a rotating shaft, an infrared filter, and a visible light filter. The protective glass is fixed to the front end of the lens barrel, the first concave lens is fixed inside the lens barrel, the rotating shaft is rotatably disposed inside the lens barrel and parallel to the axial direction of the lens barrel, and the infrared filter and the visible light filter are respectively fixed on both sides of the rotating shaft. The zoom group consists of a second concave lens and a positive and negative cemented doublet lens group. The second concave lens is movably disposed inside the lens barrel, and the positive and negative cemented doublet lens group is fixed to the rear side of the second concave lens. The compensation group is a positive-negative-positive triplet lens group, which is movably disposed inside the lens barrel; The rear fixing assembly is a third concave lens, and the third concave lens is fixed inside the lens barrel; The switching mechanism is connected to the rotating shaft and is used to drive the rotating shaft to rotate. When fog-penetrating function is required, the switching mechanism rotates the infrared filter to the axis of the lens barrel. External light passes through the protective glass, infrared filter, first concave lens, second concave lens, positive and negative cemented doublet lens group, positive and negative positive triplet lens group and third concave lens in sequence to finally reach the imaging surface. When the fog dissipates, the switching mechanism rotates the visible light filter to the axis of the lens barrel. External light passes through the protective glass, visible light filter, first concave lens, second concave lens, positive and negative cemented doublet lens group, positive and negative positive triplet lens group and third concave lens in sequence to finally reach the imaging surface.

2. The fog-penetrating lens according to claim 1, characterized in that, The switching mechanism includes a micro motor, which is connected to the rotating shaft and is used to drive the rotating shaft to rotate.

3. The fog-penetrating lens according to claim 2, characterized in that, A first protective shell, which communicates with the lens barrel, is also fixed on the lens barrel, and the housing of the micro motor is fixed inside the first protective shell.

4. The fog-penetrating lens according to claim 3, characterized in that, The switching mechanism further includes a power shaft, a drive gear, and a driven gear. The power shaft is rotatably disposed within the first protective housing. The drive gear is fixedly sleeved on the power shaft. The driven gear is fixedly sleeved on the rotating shaft and meshes with the drive gear. The output shaft of the micro motor is coaxially and fixedly connected to the power shaft.

5. The fog-penetrating lens according to claim 4, characterized in that, The switching mechanism also includes a bearing, the inner ring of which is fixedly sleeved on one end of the power shaft, and the outer ring of which is fixed to the inner sidewall of the first protective shell.

6. The fog-penetrating lens according to claim 4, characterized in that, The switching mechanism also includes a support plate, which is fixed inside the first protective shell. The support plate has a first through hole, and the other end of the power shaft is rotatably inserted into the first through hole.

7. The fog-penetrating lens according to claim 1, characterized in that, A second support plate and a third support plate are also fixed on the inner wall of the lens barrel, and the two ends of the rotating shaft are rotatably connected to the second support plate and the third support plate, respectively.

8. The fog-penetrating lens according to claim 1, characterized in that, A second protective shell, which is connected to the lens barrel, is also fixed on the lens barrel. When the infrared filter or the visible light filter rotates, it is always located inside the lens barrel or the second protective shell.

9. The fog-penetrating lens according to claim 1, characterized in that, It also includes an image sensor, which is fixed inside the lens barrel, with the receiving end of the image sensor located on the imaging surface.

10. The fog-penetrating lens according to claim 9, characterized in that, The system also includes a processor electrically connected to both the image sensor and the switching mechanism. The processor sends commands to the switching mechanism to sequentially rotate the infrared filter and the visible light filter onto the axis of the lens barrel. The image sensor receives the images filtered by the infrared filter and the visible light filter, respectively, thus obtaining a first image filtered by the infrared filter and a second image filtered by the visible light filter. The processor extracts a first object contour from the first image. Then, the processor performs grayscale processing on the second image and extracts a second object contour from the grayscale processed second image. The first object contour and the second object contour are then compared. If the similarity exceeds a preset value, the environment is determined to be non-foggy. The visible light filter is then rotated onto the axis of the lens barrel via the switching mechanism for color image acquisition. If the similarity does not exceed a preset value, the environment is determined to be foggy. The infrared filter is then rotated onto the axis of the lens barrel via the switching mechanism for fog-penetrating image acquisition.

Images