Optical lens, camera and imaging device

Abstract

The invention relates to the technical field of cameras, provides an optical lens, a camera and an imaging device, and can solve the problem that the imaging quality is affected due to the fact that light received by a visible light lens and an infrared lens in unit area is reduced. The optical lens comprises a shell, and a reflecting part, a first lens and a second lens which are arranged in the shell, the shell is provided with a light inlet window, the light inlet window is used for allowing light beams to enter the shell, and the light beams comprise visible light rays and infrared light rays; the reflecting part is provided with a reflecting surface, a light through hole is formed in the reflecting surface, and the reflecting part is used for reflecting a light beam irradiated to the reflecting surface to form a first light beam; the light through hole is used for allowing a light beam irradiated to the light through hole to enter so as to form a second light beam penetrating through the reflecting surface; the first lens is one of a visible light lens and an infrared lens and is used for receiving the first light beam; the second lens is the other one of the visible light lens and the infrared lens and is used for receiving the second light beam. The device can be used on a vehicle.

Description

Technical Field

[0001] The present application relates to the field of camera technology, and in particular to an optical lens, a camera and an imaging device. Background Art

[0002] Visible light is the part of the electromagnetic spectrum that the human eye can perceive. Visible light imaging is rich in details, high in resolution, and good in visual effects, but the quality of visible light imaging will drop significantly in harsh environments. Infrared light is light with a longer wavelength than visible light, and the human eye cannot perceive light in this band. Infrared imaging presents better thermal contrast and is less affected by weather and lighting, effectively improving people's ability to find targets. However, infrared imaging is quite different from human visual effects, which partially affects the recognition of targets and scenes.

[0003] With the development of imaging technology, imaging devices with image fusion function have emerged. This imaging device fully utilizes the complementarity of visible light image and infrared image feature information, fuses infrared image and visible light image information, and can obtain image detail feature information in harsh environments. Among them, the optical lens that can receive infrared light and visible light is an important part of the imaging device, and how to design this optical lens has become an important topic in the industry.

[0004] The optical lens in the related art divides the incident light beam irradiated into the optical lens into a reflected light beam and a transmitted light beam with a certain light intensity ratio by setting a beam splitter prism, the transmitted light beam is received by the visible light lens, and the reflected light beam is received by the infrared lens. Since the incident light beam is split by the beam splitter prism, the light intensity of the reflected light beam and the transmitted light beam is less than the incident light beam, so the light received by the infrared lens and the visible light lens per unit area is reduced, so that the illumination of the infrared image plane and the visible light image plane is reduced, thereby reducing the quality of the infrared imaging and visible light imaging of the optical lens. Summary of the invention

[0005] The embodiments of the present application provide an optical lens, a camera, and an imaging device, which are used to solve the problem that the amount of light received per unit area by a visible light lens and an infrared lens is reduced, thereby affecting the imaging quality.

[0006] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides an optical lens, comprising a shell, and a reflecting portion, a first lens and a second lens arranged in the shell; a light entrance window is provided on the shell, and the light entrance window is used for allowing a light beam to enter the shell, and the light beam includes visible light and infrared light; the reflecting portion has a reflecting surface, and a light through hole is provided on the reflecting surface, and the reflecting portion is used to reflect the light beam irradiated to the reflecting surface to form a first light beam; the light through hole is used for allowing the light beam irradiated to the light through hole to enter, so as to form a second light beam passing through the reflecting surface; the first lens is a visible light lens and is used to receive the first light beam, and the second lens is an infrared lens and is used to receive the second light beam; or, the first lens is an infrared lens and is used to receive the first light beam, and the second lens is a visible light lens and is used to receive the second light beam.

[0008] The optical lens in the embodiment of the present application has a reflective portion in the housing, the reflective portion has a reflective surface, and a light-through hole is provided on the reflective surface, so that the reflective portion can divide the light beam entering the housing into a first light beam reflected by the reflective surface and a second light beam passing through the reflective surface through the light-through hole. Since the first light beam is formed by the light beam irradiated on the reflective surface and reflected, the reflective surface will not reduce the light intensity of the light beam in the process of reflecting the light beam, that is, the light beam per unit area will not be reduced after being reflected by the reflective surface, thus avoiding the reduction of the light received per unit area of ​​the first lens. Since the second light beam is formed by the light beam entering the light-through hole, the light intensity will not be reduced in the process of the light beam entering the light-through hole, that is, the light beam per unit area of ​​the light beam entering the light-through hole 1 will not be reduced, thus avoiding the reduction of the light received per unit area of ​​the second lens. At the same time, by reasonably controlling the ratio of the aperture area of ​​the light hole to the area of ​​the reflective surface outside the light hole, not only can the light input requirements of the first lens and the second lens be met to ensure that the illumination of the photosensitive surfaces of the first photosensitive element and the second photosensitive element meets the imaging quality requirements, but also the uneven light input in the central area and the edge area of ​​the first lens can be avoided, thereby ensuring the quality of the infrared imaging and visible light imaging of the camera.

[0009] In some embodiments, the first lens is a visible light lens, and the second lens is an infrared lens; the area of ​​the reflective surface located outside the light hole is S1, and the area of ​​the aperture of the light hole located on the reflective surface is S2; wherein S1 and S2 satisfy: 1≤S1 / S2≤6. Such a setting can not only meet the requirements of the light intake of the first lens and the second lens at the same time, but also improve the uniformity of the light intake in the central area and the edge area of ​​the first lens.

[0010] In some embodiments, S1 / S2 = 5. This configuration can better meet the requirements of the light intake of the first lens and the second lens, and can also further improve the light intake uniformity of the central area and the edge area of ​​the first lens.

[0011] In some embodiments, the reflective surface includes a first reflective surface and a second reflective surface, the first reflective surface is used to reflect the light beam irradiated to the first reflective surface to the second reflective surface, and the second reflective surface is used to reflect the light beam reflected by the first reflective surface to form a first light beam; the light through hole is set on the first reflective surface; along the depth direction of the light through hole, the first lens is located on the side of the second reflective surface away from the light entrance window, and the light entrance end of the first lens is set toward the second reflective surface. Such a setting is conducive to reducing the size of the optical lens in the depth direction along the light through hole, thereby reducing the size of the camera in the depth direction along the light through hole.

[0012] In some embodiments, the first reflective surface and the second reflective surface are planes, and the first reflective surface and the second reflective surface have equal inclination angles relative to the depth direction of the light-through hole. This arrangement facilitates the optimal arrangement of the first lens and the second lens, and reduces the space occupied by the first lens and the second lens in a direction perpendicular to the depth direction of the light-through hole.

[0013] In some embodiments, the first reflective surface is a concave surface, and the second reflective surface is located between the focus of the first reflective surface and the first reflective surface. Such a configuration is not only conducive to reducing the size of the second reflective surface and the first lens, but also conducive to increasing the light received by the first lens per unit area.

[0014] In some embodiments, the first reflection surface is an off-axis parabola, the second reflection surface is a plane and is tilted relative to the depth direction of the light hole, and in the cross section perpendicular to the second reflection surface and passing through the focus, the size of the second reflection surface in the first direction is D2; D2 satisfies: D2 = D1 (QL) / Q: wherein the first direction is the direction perpendicular to the first central axis; the first central axis is the central axis of the parabola where the first reflection surface is located; D1 is the size of the first reflection surface in the first direction; Q is the distance from the center point of the first reflection surface to the first central axis, and L is the distance from the center point of the first reflection surface to the center point of the second reflection surface in the first direction. Such a setting can ensure that the second reflection surface can relatively completely receive the light beam reflected by the first reflection surface, and avoid light energy loss when the light beam propagates between the first reflection surface and the second reflection surface.

[0015] In some embodiments, the first reflecting surface is an off-axis parabola, the second reflecting surface is a plane, and in a cross section perpendicular to the second reflecting surface and passing through the focus, the inclination angle θ of the second reflecting surface relative to the depth direction of the light-through hole satisfies: θ = 90° - arc tan {Q / [(R / 2)-(Q 2 / 2R)]} / 2; where Q is the distance from the center point of the first reflection surface to the first central axis, the first central axis is the central axis of the parabola where the first reflection surface is located; R is the quasi-focal length of the parabola where the first reflection surface is located. This arrangement can ensure that the optical axis of the first light beam is parallel to the optical axis of the second light beam, thereby facilitating the optimal arrangement of the first lens and the second lens.

[0016] In some embodiments, the light hole is arranged toward the light entrance window, and the light entrance end of the second lens is arranged toward the light entrance window. Such an arrangement can shorten the path of the light beam entering the second lens, thereby ensuring that the light beam entering from the light entrance window efficiently enters the second lens.

[0017] In some embodiments, the light entrance window is a hollow opening arranged on one side of the housing. Such an arrangement allows visible light and infrared light of different wavelengths to enter the housing, and the infrared lens can be set as either a near-infrared lens or a far-infrared lens, which greatly expands the use of the optical lens.

[0018] In some implementations, the light hole is a tapered hole, and the large end of the light hole is located on the first reflective surface. This arrangement is conducive to improving the field of view of the second lens.

[0019] In some embodiments, the optical axis of the first lens and the optical axis of the second lens are parallel to the depth direction of the light hole. This arrangement can make the arrangement of the reflective part, the first lens, and the second lens in the housing more compact.

[0020] In some embodiments, the infrared lens includes a first lens group, a second lens group, a third lens group, and a fourth lens group arranged in a direction from the object side to the image side; the first lens group and the third lens group have positive optical power, the second lens group and the fourth lens group have negative optical power, and the second lens group and the third lens group are double-cemented lenses. Such an arrangement can correct aberrations such as chromatic aberration, spherical aberration, and field curvature of the infrared lens, thereby facilitating the improvement of the imaging quality of the infrared lens.

[0021] In some embodiments, along the direction from the object side to the image side, the object side surface of the first lens of the third lens group forms a first aperture stop. This arrangement can correct aberrations such as distortion and coma of the infrared lens, thereby improving the imaging quality of the infrared lens.

[0022] In some embodiments, the fourth lens group includes a negative lens, and the object side surface and the image side surface of the negative lens are both curved toward the image side. Such an arrangement can not only correct aberrations such as field curvature and distortion of the infrared lens, but also improve the anti-reflection performance of the infrared lens and improve the strength and durability of the negative lens.

[0023] In some embodiments, on the optical axis of the infrared lens, the distance between the third lens group and the fourth lens group is greater than the distance between the second lens group and the third lens group. In this way, the thickness of the third lens group can be designed to be thinner, thereby reducing the weight of the third lens group.

[0024] In some embodiments, the visible light lens includes a first convex lens, a first double-cemented lens, a second aperture stop, a second double-cemented lens, and a second convex lens arranged in a direction from the object side to the image side, the first double-cemented lens and the second double-cemented lens have positive focal length; the first double-cemented lens and the second double-cemented lens both include a concave lens and a convex lens that are cemented together; on the optical axis of the visible light lens, the thickness of the second double-cemented lens is greater than the thickness of the first double-cemented lens, and the thickness of the convex lens of the second double-cemented lens is greater than the thickness of the convex lens of the first double-cemented lens. With such an arrangement, aberrations such as coma, distortion, and chromatic aberration of the visible light lens can be well corrected, thereby facilitating the improvement of the imaging quality of the visible light lens.

[0025] In some embodiments, on the optical axis of the visible light lens, the distance between the second doublet lens and the second aperture stop is smaller than the distance between the first doublet lens and the second aperture stop. With this arrangement, the diameters of the second doublet lens and the second convex lens can be designed to be smaller, thereby reducing the weight of the second doublet lens and the second convex lens.

[0026] In some embodiments, a mounting seat is detachably provided in the housing, and the reflector, the first lens, and the second lens are all detachably provided on the mounting seat; the housing has an assembly port through which the mounting seat can pass, and a cover is detachably provided at the assembly port, and the cover covers part of the assembly port, and the uncovered area of ​​the assembly port constitutes a light entrance window. With such an arrangement, the reflector, the first lens, and the second lens can be easily replaced, thereby helping to reduce the maintenance costs of the reflector, the first lens, and the second lens.

[0027] In some embodiments, the reflective surface includes a first reflective surface and a second reflective surface, the first reflective surface is used to reflect the light beam irradiated to the first reflective surface to the second reflective surface, and the second reflective surface is used to reflect the light beam reflected by the first reflective surface to form a first light beam; the light hole is arranged on the first reflective surface; the reflective part includes a first base, a second base, a first reflector having a first reflective surface, and a second reflector having a second reflective surface; the first reflector is arranged on the first base, and the second reflector is arranged on the second base; the first base and the second base are both detachably connected to the mounting base, a part of the second base is located at the assembly opening to cover part of the assembly opening, and the second base is a covering member. Such an arrangement is conducive to reducing the number of components of the optical lens, and thus is conducive to improving the assembly efficiency of the optical lens.

[0028] In some embodiments, the mounting base includes two detachably connected first mounting bases and two detachably connected second mounting bases; each first mounting base is provided with a first groove, the first grooves on the two first mounting bases are matched to form a first mounting hole, and the first lens is arranged in the first mounting hole; each second mounting base is provided with a second groove, the second grooves on the two second mounting bases are matched to form a second mounting hole, and the second lens is arranged in the second mounting hole. Such a configuration can reduce the difficulty of disassembling and assembling the first lens and the second lens, thereby helping to reduce the cost of repairing and replacing the first lens and the second lens.

[0029] In some embodiments, a plurality of first annular grooves are provided on the hole wall of the first mounting hole, the plurality of first annular grooves are arranged along the axial direction of the first mounting hole, and the first annular grooves are arranged around the hole axis of the first mounting hole; a plurality of second annular grooves are provided on the hole wall of the second mounting hole, the plurality of second annular grooves are arranged along the axial direction of the second mounting hole, and the second annular grooves are arranged around the hole axis of the second mounting hole. With such an arrangement, the contact area between the first lens, the second lens and the hole wall is reduced, which is conducive to reducing the friction between the first lens, the second lens and the hole wall, and further making the installation of the first lens and the second lens smoother.

[0030] In a second aspect, an embodiment of the present application provides a camera, comprising a first photosensitive element, a second photosensitive element, and the optical lens of the first aspect; the photosensitive surface of the first photosensitive element is arranged toward the light output end of the first lens, and the photosensitive surface of the second photosensitive element is arranged toward the light output end of the second lens.

[0031] The beneficial effects of the camera in the embodiment of the present application are the same as the beneficial effects of the optical lens in the first aspect, and will not be repeated here.

[0032] In a third aspect, an embodiment of the present application provides an imaging device, comprising a processor, a display screen, and the camera of the second aspect; the processor is used to fuse the image acquired by the first photosensitive element with the image acquired by the second photosensitive element to form a fused image, and the display screen is used to display the fused image.

[0033] The beneficial effects of the imaging device in the embodiment of the present application are the same as the beneficial effects of the camera in the second aspect, and will not be repeated here.

[0034] In some embodiments, the imaging device is an imaging device for assisting vehicle driving, and the camera is used to be installed at the front end of the vehicle or at the front edge of the top wall of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the structure of an optical lens of an imaging device in the related art;

[0036] Figure 2This is a schematic diagram of the structure of a camera in some embodiments of the present application;

[0037] Figure 3 for Figure 2 A schematic diagram of the structure of the camera in another viewing angle;

[0038] Figure 4 for Figure 2 A longitudinal cross-sectional view of the camera in FIG.

[0039] Figure 5 For the beam Figure 4 Schematic diagram of the transmission in the camera;

[0040] Figure 6a This is a schematic diagram of the structure of a camera in the second embodiment of the present application;

[0041] Figure 6b for Figure 6a Schematic diagram of calculation of the positional relationship between the first reflecting surface and the second reflecting surface;

[0042] Figure 7 for Figure 2 An exploded view of the camera shown;

[0043] Figure 8 for Figure 2 An exploded view of the camera mount;

[0044] Fig. 9 for Figure 2 A schematic diagram of the structure of the camera after removing the first photosensitive element and the second photosensitive element;

[0045] Fig.10 This is a schematic diagram of the installation of the first photosensitive element and the second photosensitive element in some embodiments of the present application;

[0046] Fig.11 for Figure 4 The structural diagram of the infrared lens shown in ;

[0047] Fig.12 is a light path diagram of the optical lens in the embodiment of the present application;

[0048] Fig.13 for Fig.12 Light path diagram of mid-infrared lens;

[0049] Fig.14 for Figure 4 The structural schematic diagram of the visible light lens shown in ;

[0050] Fig.15 for Fig.12 Light path diagram of visible light lens;

[0051] Fig.16is a principle block diagram of an imaging device in some embodiments of the present application;

[0052] Fig.17 The following are some examples of camera application scenarios in this application: Figure 1 ;

[0053] Fig.18 The following are some examples of camera application scenarios in this application: Figure 2 ;

[0054] Fig.19 The following are some examples of camera application scenarios in this application: Figure 3 . DETAILED DESCRIPTION

[0055] The technical solutions in some embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0056] Visible light is the part of the electromagnetic spectrum that can be sensed by the human eye, with a wavelength range of 0.38μm to 0.76μm. Visible light imaging uses a visible light lens to collect visible light emitted by an object, then images it on a photosensitive element, and then processes it to convert it into an image for display. Visible light imaging has rich details, high resolution, and good visual effects, but the quality of visible light imaging will drop significantly in harsh environments.

[0057] Infrared light, also called infrared rays, is light with a longer wavelength than visible light, with a wavelength of 0.76μm to 20μm. The light in this band cannot be perceived by the human eye. Infrared light is divided into near infrared light (wavelength range 0.76μm to 3μm), mid-infrared light (wavelength range 3μm to 6μm) and far infrared light (6μm to 20μm) according to its wavelength.

[0058] Infrared imaging uses infrared lenses to collect infrared energy emitted by objects, then images them on photosensitive elements, and then converts them into images for display. According to atmospheric optics research, the atmosphere has a high transmittance to infrared light in the three bands of 1.5μm to 2.5μm, 3μm to 5μm, and 8μm to 14μm, which are suitable for infrared imaging and are called atmospheric windows.

[0059] Infrared imaging shows better thermal contrast, is less affected by weather and lighting, has the advantages of penetrating fog, haze, rain, and snow and has a long range, effectively improving people's ability to detect targets and improving observation capabilities in all-weather conditions. However, infrared imaging is quite different from human eye vision, which partially affects the recognition of targets and scenes.

[0060] With the development of imaging technology, imaging devices with image fusion function have emerged. This imaging device gives full play to the complementarity of the characteristic information of visible light images and infrared images, fuses the information of infrared images and visible light images, and can obtain image detail characteristic information in harsh environments, thereby enhancing the user's observation and recognition capabilities. This imaging device has been widely used in vehicle assisted driving, medical imaging and recognition, aerial photography and other fields.

[0061] Among them, the optical lens that can receive infrared light and visible light is an important component of the imaging device, and how to design the optical lens has become an important topic in the industry.

[0062] like Figure 1 As shown, Figure 1 The figure is a schematic diagram of the structure of an optical lens of an imaging device in the related art. The optical lens includes a front lens group 01, a beam splitter prism 02, a visible light lens 03 and an infrared lens 04. The beam splitter prism 02 is arranged between the front lens group 01 and the visible light lens 03. The infrared lens 04 is a near-infrared lens and is arranged on one side of the beam splitter prism 02. The optical axis of the visible light lens 03 and the optical axis of the infrared lens 04 are arranged at 90 degrees. The incident light beam 07 is irradiated onto the beam splitter prism 02 after being transmitted by the front lens group 01 and is reflected and refracted. The transmitted light of the beam splitter prism 02 is incident on the visible light image plane 09 after passing through the visible light lens 03 to perform high-resolution visible light imaging. The reflected light of the beam splitter prism 02 is incident on the infrared image plane 08 after passing through the infrared lens to perform near-infrared imaging.

[0063] In this optical lens of the related technology, the beam splitter prism 02 splits the incident light beam 07 into a reflected light beam 05 and a transmitted light beam 06 with a certain light intensity ratio (for example, 5:5 or 7:3), that is, the light density (the number of light beams per unit area) of the reflected light beam 05 and the transmitted light beam 06 is smaller than that of the incident light beam 07, so that the light received by the infrared lens 04 and the visible light lens 03 per unit area is reduced, so that the illumination of the infrared image plane 08 and the visible light image plane 09 is reduced, thereby reducing the quality of infrared imaging and visible light imaging of the optical lens.

[0064] To this end, the embodiments of the present application provide an optical lens, a camera and an imaging device. By setting a reflective portion having a reflective surface, a light-through hole is provided on the reflective surface. In this way, the reflective surface with the light-through hole can divide the incident light beam into two light beams received by the visible light lens and the infrared lens, namely, a first light beam reflected by the reflective surface and a second light beam passing through the light-through hole on the reflective surface, thereby solving the problem that the light received per unit area by the visible light lens and the infrared lens is reduced, thereby affecting the imaging quality.

[0065] like Figure 2 to Figure 5 As shown, Figure 2is a schematic diagram of the structure of the camera in the first embodiment of the present application, Figure 3 for Figure 2 A schematic diagram of the structure of the camera in another perspective. Figure 4 for Figure 3 The cross-sectional view of the camera at section A in , Figure 5 For the beam Figure 4 The camera includes an optical lens 100, a first photosensitive element 200 and a second photosensitive element 300.

[0066] like Figure 4 and Figure 5 As shown, the optical lens 100 includes a housing 1, and a reflective portion 2, a first lens 3, and a second lens 4 disposed in the housing 1. The housing 1 is provided with a light entrance window 11, which is used for allowing a light beam 5 to enter the housing 1, and the light beam 5 includes visible light and infrared light.

[0067] The reflective portion 2 has a reflective surface 20, and a light hole 21 is provided on the reflective surface 20. The reflective portion 2 is used to reflect the light beam 5 irradiated to the reflective surface 20 to form a first light beam 51. The first lens 3 is a visible light lens and is used to receive the first light beam 51. The light hole 21 is used for the light beam 5 irradiated to the light hole 21 to enter, so as to form a second light beam 52 passing through the reflective surface 20. The second lens 4 is an infrared lens and is used to receive the second light beam 52.

[0068] The photosensitive surface 210 of the first photosensitive element 200 faces the light-emitting end of the first lens 3 (eg Figure 4 The light-sensing surface 310 of the second photosensitive element 300 faces the light-emitting end of the second lens 4 (for example, Figure 4 The second lens 4 is set at the right end of the lens.

[0069] Among them, the first photosensitive element 200 and the second photosensitive element 300 can be a charge coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS), which is not specifically limited here.

[0070] The optical lens 100 in the embodiment of the present application is as follows: Figure 4 and Figure 5As shown, since a reflecting portion 2 is provided in the shell 1, the reflecting portion 2 has a reflecting surface 20, and a light hole 21 is provided on the reflecting surface 20, the reflecting portion 2 can divide the light beam 5 entering the shell 1 into a first light beam 51 reflected by the reflecting surface 20, and a second light beam 52 passing through the reflecting surface 20 through the light hole 21. Since the first light beam 51 is formed by the light beam 5 irradiated on the reflecting surface 20 and reflected, the reflecting surface 20 will not reduce the light intensity of the light beam 5 in the process of reflecting the light beam 5, that is, the light per unit area of ​​the light beam 5 will not be reduced after reflection by the reflecting surface 20, thereby avoiding the reduction of the light received per unit area of ​​the first lens 3.

[0071] Since the second light beam 52 is formed by the light beam 5 entering the light hole 21, the light intensity of the light beam 5 will not decrease during the process of entering the light hole 21, that is, the light per unit area of ​​the light beam 5 entering the light hole 21 will not decrease, thus avoiding the reduction of the light received by the second lens 4 per unit area.

[0072] At the same time, by reasonably controlling the ratio of the aperture area of ​​the light hole 21 to the area of ​​the reflective surface 20 outside the light hole 21, not only can the light input requirements of the first lens 3 and the second lens 4 be met to ensure that the illumination of the photosensitive surfaces of the first photosensitive element 200 and the second photosensitive element 300 meets the imaging quality requirements, but also the uneven light input in the central area and the edge area of ​​the first lens 3 can be avoided, thereby ensuring the quality of the infrared imaging and visible light imaging of the camera.

[0073] In addition, the first lens 3 and the second lens 4 in the optical lens 100 share a part of the optical path, that is, they share the light beam 5 entering the housing 1 through the light entrance window 11, so that the size and position of the image formed by the first lens 3 and the second lens 4 are the same, eliminating parallax, thereby facilitating subsequent image fusion to improve the imaging quality of the fused image.

[0074] like Figure 4As shown, the area of ​​the reflective surface 20 located outside the light hole 21 is S1, and the aperture area of ​​the light hole 21 located on the reflective surface 20 is S2. S1 / S2 is an important parameter of the optical lens 100. S1 / S2 should not be too large or too small. If S1 / S2 is too large, the aperture area S2 of the light hole 21 will be too small, which will affect the amount of light entering the second lens 4. If S1 / S2 is too small, the area S1 of the reflective surface 20 outside the light hole 21 will be too small, which will affect the amount of light entering the first lens 3 and will not be conducive to improving the uniformity of light entering the center and edge areas of the first lens 3. After research and calculation, when S1 and S2 meet: 1≤S1 / S2≤6, not only can the requirements of the amount of light entering the first lens 3 and the second lens 4 be met at the same time, but also the uniformity of light entering the center and edge areas of the first lens 3 can be improved, thereby ensuring the quality of infrared imaging and visible light imaging of the camera.

[0075] Wherein, in some embodiments, Figure 4 As shown, the reflective surface 20 and the aperture 211 of the light-through hole 21 are both circular. The diameter of the reflective surface 20 is d1, the diameter of the aperture 211 of the light-through hole 21 is d1, and d1 / d2 satisfies:

[0076] Of course, the reflective surface 20 and the opening 211 of the light-through hole 21 may be configured in other shapes besides a circle, such as a regular polygon, for example a square.

[0077] After further research and calculation, when S1 and S2 satisfy: S1 / S2=5, the requirements of the amount of light entering the first lens 3 and the second lens 4 can be better met, and the uniformity of the light entering the central area and the edge area of ​​the first lens 3 can be further improved, thereby better ensuring the quality of the infrared imaging and visible light imaging of the camera.

[0078] When the reflective surface 20 and the opening 211 of the light-through hole 21 are both circular,

[0079] The positions of the visible light lens and the infrared lens in the embodiment of the present application can also be swapped, that is, the first lens 3 is an infrared lens, which is used to receive the first light beam 51, and the second lens 4 is a visible light lens, which is used to receive the second light beam 52. This setting is suitable for situations where the visible light lens does not have a large demand for the amount of light entering, for example, S1 / S2 can be set to 1, that is, S1=S2.

[0080] In some embodiments, Figure 5As shown, the reflective surface 20 includes a first reflective surface 22 and a second reflective surface 23. The first reflective surface 22 is used to reflect the light beam 5 irradiated to the first reflective surface 22 to the second reflective surface 23. The second reflective surface 23 is used to reflect the light beam 5 reflected by the first reflective surface 22 to form a first light beam 51. The light through hole 21 is provided on the first reflective surface 22; wherein S1 is the area of ​​the first reflective surface 22 located outside the light through hole 21.

[0081] Along the depth direction X of the light hole 21, the first lens 3 is located on the side of the second reflective surface 23 away from the light incident window 11, and the light incident end of the first lens 3 (for example Figure 5 The right end of the first lens 3 shown in FIG. 1 is arranged toward the second reflecting surface 23.

[0082] By arranging the first lens 3 on the side of the second reflective surface 23 away from the light incident window 11, the first lens 3 and the second lens 4 are both located on the side of their respective corresponding reflective surfaces 20 away from the light incident window 11. In this way, the sizes of the first lens 3 and the second lens 4 in the depth direction X along the light through hole 21 can overlap, which is beneficial to reducing the size of the optical lens 100 in the depth direction X along the light through hole 21, and further reducing the size of the camera in the depth direction X along the light through hole 21.

[0083] The first reflective surface 22 and the second reflective surface 23 are not arranged in a unique manner. In some embodiments, for example, Figure 4 and Figure 5 As shown, the first reflection surface 22 and the second reflection surface 23 are planes, and the first reflection surface 22 and the second reflection surface 23 have the same inclination angle relative to the depth direction X of the light-through hole 21. By setting the first reflection surface 22 and the second reflection surface 23 to be planes, it is convenient to process and manufacture the first reflection surface 22 and the second reflection surface 23, which is conducive to reducing the manufacturing cost of the reflection part 2. At the same time, since the first reflection surface 22 and the second reflection surface 23 have the same inclination angle relative to the optical axis of the second light beam 52, that is, the first reflection surface 22 is parallel to the second reflection surface 23, such a setting can make the optical axis of the first light beam 51 parallel to the optical axis of the second light beam 52, thereby facilitating the optimal arrangement of the first lens 3 and the second lens 4, reducing the space occupied by the first lens 3 and the second lens 4 in the direction Y perpendicular to the depth direction X of the light-through hole 21, so that the arrangement of the reflection part 2, the first lens 3, and the second lens 4 in the housing 1 is more compact.

[0084] In some embodiments, Figure 6a and Figure 6b As shown, Figure 6a is a schematic diagram of the structure of a camera in the second embodiment of the present application, Figure 6b for Figure 6a The principle diagram of calculating the position relationship between the first reflecting surface 22 and the second reflecting surface 23, Figure 6b The light hole 21 is not shown in the figure. The first reflection surface 22 is a concave surface, and the second reflection surface 23 is located between the focus F of the first reflection surface 22 and the first reflection surface 22. With such a configuration, the first reflection surface 22 can converge the light beam 5, that is, the diameter of the light beam 5 reflected by the first reflection surface 22 to the second reflection surface 23 is gradually reduced, which is not only conducive to reducing the size of the second reflection surface 23 and the first lens 3, but also conducive to the optimized layout of the first lens 3 and the second reflection surface 23. In addition, the convergence of the reflected light beam of the first reflection surface 22 is conducive to increasing the light received by the first lens 3 per unit area, and improving the light intensity of the first light beam 51, thereby facilitating the improvement of the illumination of the photosensitive surface of the first photosensitive element 200, and further facilitating the improvement of the imaging quality of the first lens 3.

[0085] In some embodiments, Figure 6a and Figure 6b As shown, the first reflecting surface 22 is an off-axis parabola, the second reflecting surface 23 is a plane and is tilted relative to the depth direction X of the light hole 21, and in the cross section perpendicular to the second reflecting surface 23 and passing through the focus F, the size of the second reflecting surface 23 in the first direction is D2.

[0086] D2 satisfies: D2=D1(QL) / Q:

[0087] The first direction is perpendicular to the first central axis, that is, Figure 6b The first central axis is the central axis of the parabola where the first reflecting surface 22 is located, that is, Figure 6b D1 is the size of the first reflecting surface 22 in the first direction; Q is the distance from the center point of the first reflecting surface 22 to the first central axis, and L is the distance from the center point of the first reflecting surface 22 to the center point of the second reflecting surface 23 in the first direction.

[0088] In this way, when D2 satisfies: D2=D1(QL) / Q, it can be ensured that the second reflecting surface 23 can relatively completely receive the light beam 5 reflected by the first reflecting surface 22, avoiding the loss of light energy when the light beam 5 propagates between the first reflecting surface 22 and the second reflecting surface 23, thereby helping to ensure the amount of light entering the first lens 3.

[0089] Combine the following Figure 6b Let's explain the derivation process of D2 = D1 (QL) / Q in detail:

[0090] Figure 6bWherein M1 and N1 are two endpoints of the first reflecting surface 22, A is the center point of the first reflecting surface 22, M2 and N2 are two endpoints of the second reflecting surface 23, G is the center point of the second reflecting surface 23, and F is the focus of the parabola where the first reflecting surface 22 is located; the optical axis of the parabola where the first reflecting surface 22 is located is taken as the x-axis, and the parabola where the first reflecting surface 22 is located intersects with the x-axis at the origin O.

[0091] A coordinate system is established with the tangent of the parabola at the origin O as the y-axis, with the focus F located on the negative half axis of the x-axis, B is the projection point of the center point A of the first reflecting surface 22 on the x-axis, and E is the projection point of the center point G of the second reflecting surface 23 on the x-axis; C is the intersection of the straight line passing through the center point G of the second reflecting surface 23 and parallel to the x-axis and the line segment AB.

[0092] Depend on Figure 6b As shown in , M1M2 and N1N2 can be regarded as boundaries at which the second reflecting surface 23 can completely receive the light beam reflected by the first reflecting surface 22 .

[0093] Depend on Figure 6b It can be seen that triangle EFG is similar to triangle BFA, so FG / FA=BC / AB=(QL) / Q;

[0094] When the curvature radius of the parabola where the first reflecting surface 22 is located at points M1 and N1 is large, in order to facilitate subsequent calculations, the smaller angle between M1N1 and M2N2 is ignored, and M1N1 and M2N2 are considered to be parallel. In this way, it can be concluded that triangle FM1N1 is similar to triangle FM2N2, then:

[0095] D2 / D1=M2N2 / M1N1=FG / FA=(QL) / Q;

[0096] It can be further concluded that: D2 = D1(QL) / Q.

[0097] Among them, D2 is the projection size of M1N1 on the y-axis, and D1 is the projection size of M2N2 on the y-axis.

[0098] In some embodiments, Figure 6a and Figure 6b As shown, the inclination angle θ of the second reflective surface 23 relative to the depth direction X of the light-passing hole 21 satisfies: θ = 90° - arc tan {Q / [(R / 2)-(Q 2 / 2R)]} / 2.

[0099] Among them, Figure 6b As shown, s is the directrix of the parabola where the first reflecting surface 22 is located, and the directrix s intersects the x-axis at point W; R is the quasi-focal length of the parabola where the first reflecting surface 22 is located, that is, the length of the line segment FW.

[0100] Thus, when θ satisfies: θ = 90°-arc tan{Q / [(R / 2)-(Q 2 / 2R)]} / 2, it can be ensured that the optical axis of the first light beam 51 is parallel to the optical axis of the second light beam 52, thereby facilitating the optimal arrangement of the first lens 3 and the second lens 4, reducing the space occupied by the first lens 3 and the second lens 4 in the direction Y perpendicular to the depth direction X of the light-through hole 21, so that the arrangement of the reflective part 2, the first lens 3, and the second lens 4 in the shell 1 is more compact.

[0101] Combine the following Figure 6b Let's explain in detail θ=90°-arc tan{Q / [(R / 2)-(Q 2 / 2R)]} / 2 derivation process:

[0102] Figure 6b UA is parallel to the x-axis, UA is parallel to the optical axis of the second light beam 52, and GV is parallel to the optical axis of the second light beam 52. The following is the process of solving θ:

[0103] Depend on Figure 6b It can be seen that the equation of the first reflecting surface 22 is: 2 = -2Rx;

[0104] Then the coordinates of the focus F are (-R / 2, 0);

[0105] Since AB=Q, the horizontal coordinate of point A is x A =-Q 2 / 2R;

[0106] Then BF=R / 2-Q 2 / 2R;

[0107] Since ∠AFB=arc tan(AB / BF)=arc tan{Q / [(R / 2)-(Q 2 / 2R)]}; and ∠AFB=∠AGV;

[0108] Then θ=90°-∠TGV=90°-∠AGV / 2=90°-arc tan{Q / [(R / 2)-(Q 2 / 2R)]} / 2.

[0109] Wherein, GT is the normal line of the second reflection surface 23 at point G, and according to the law of reflection of light, ∠TGV=∠AGV / 2.

[0110] In the camera of the second embodiment of the present application, the first reflection surface 22 can be other types of concave surfaces, such as a concave spherical surface, in addition to an off-axis parabola, and can be set according to actual conditions. The second reflection surface 23 can be a concave surface, such as an off-axis parabola, a concave spherical surface, etc., in addition to a plane.

[0111] In some embodiments, Figure 5 and Figure 6a As shown, the optical axis 30 of the first lens 3 and the optical axis 40 of the second lens 4 are parallel to the depth direction X of the light-through hole 21. That is, the optical axis 30 of the first lens 3 and the optical axis 40 of the second lens 4 are parallel, and such an arrangement can further reduce the space occupied by the first lens 3 and the second lens 4 in the direction Y perpendicular to the depth direction X of the light-through hole 21, thereby making the arrangement of the reflection part 2, the first lens 3, and the second lens 4 in the housing 1 more compact.

[0112] In some embodiments, Figure 5 and Figure 6a As shown, the light hole 21 is arranged toward the light entrance window 11, and the light entrance end of the second lens 4 (for example Figure 5 The left end of the second lens 4 shown in the figure is arranged toward the light entrance window 11. In this way, the path of the light beam entering the second lens 4 can be shortened, thereby ensuring that the light beam entering from the light entrance window 11 efficiently enters the second lens 4, avoiding the light energy loss caused by the intermediate reflection element.

[0113] In some embodiments, Figure 4 As shown, the optical axis 40 of the second lens 41 is arranged in a colinear relationship with the hole axis of the light-through hole 21. Of course, it is not limited thereto, and the optical axis 40 of the second lens 41 can also be arranged to deviate from the hole axis of the light-through hole 21.

[0114] The positional relationship between the second lens 4 and the light-through hole 21 is not unique. In some embodiments, for example Figure 4 As shown, the second lens 4 is disposed outside the light hole 21. Specifically, the second lens 4 is located on a side of the light hole 21 away from the light incident window 11. In other embodiments, the second lens 4 may also be disposed inside the light hole 21.

[0115] In some embodiments, Figure 4 and Figure 5 As shown, the light hole 21 is a tapered hole, and the large end of the light hole 21 is located on the first reflective surface 22. Such a configuration can reduce the obstruction of the field of view of the second lens 4 by the hole wall of the light hole 21, thereby facilitating the improvement of the field of view of the second lens 4.

[0116] Of course, in addition to being arranged toward the light incident window 11, the light through hole 21 may also be arranged not toward the light incident window 11. Specifically, the light through hole 21 is arranged on the second reflective surface 23, the light through hole 21 is arranged toward the first reflective surface 22, and the light incident end of the second lens 4 is arranged toward the first reflective surface 22.

[0117] In some embodiments, Figure 2 and Figure 4 As shown, the light entrance window 11 is a hollow opening arranged on one side of the housing 1. With such a design, visible light and infrared light of different wavelengths (such as far infrared light of 8μm-14μm wavelength and near infrared light of 1.5μm-2.5μm wavelength) can enter the housing 1, so that the infrared lens in the embodiment of the present application can be set as either a near infrared lens or a far infrared lens, which greatly expands the use of the optical lens 100.

[0118] Of course, the light entrance window 11 can also be set to the following structure: a partial area of ​​the shell wall located on one side of the shell 1 is made of light-transmitting material to form a light-transmitting window. For example, the light-transmitting window can be made of glass that can transmit visible light and near-infrared light in the 1.5μm to 2.5μm band.

[0119] In some embodiments, Figure 2 and Figure 4 As shown, a mounting seat 6 is detachably provided in the housing 1, and the reflecting part 2, the first lens 3, and the second lens 4 are all detachably arranged on the mounting seat 6. The housing 1 has an assembly opening 12 for the mounting seat 6 to pass through, and a covering member (such as the second base 25 shown in the figure, which will be described later) is detachably provided at the assembly opening 12, and the covering member covers part of the assembly opening 12, and the uncovered area of ​​the assembly opening 12 constitutes a light entrance window 11.

[0120] With such arrangement, when at least one of the first lens 3, the second lens 4 and the reflecting part 2 is damaged, the cover can be removed from the assembly opening 12 first, and then the mounting seat 6 can be detached from the shell 1, and the mounting seat 6 can be moved out of the shell 1 through the assembly opening 12. Since the reflecting part, the first lens 3 and the second lens 4 can all be detachably arranged on the mounting seat 6, the reflecting part 2, the first lens 3 and the second lens 4 can be conveniently replaced, which is beneficial to reduce the maintenance cost of the reflecting part 2, the first lens 3 and the second lens 4.

[0121] In some embodiments, Figure 4 and Figure 7 As shown, Figure 7 for Figure 2The exploded diagram of the camera shown in FIG. The reflecting part 2 includes a first base 24, a second base 25, a first reflector 26 having a first reflective surface 22, and a second reflector 27 having a second reflective surface 23. The first reflector 26 is arranged on the first base 24, and the second reflector 27 is arranged on the second base 25; the first base 24 and the second base 25 are both detachably connected to the mounting base 6, a part of the second base 25 is located at the assembly opening 12 to cover part of the assembly opening 12, and the second base 25 is a covering member. By setting the second base 25 as a covering member, the structure of the reflecting part 2 can be fully utilized, so there is no need to set a covering member separately, which is conducive to reducing the number of components of the optical lens 100, and further conducive to improving the assembly efficiency of the optical lens 100.

[0122] In some embodiments, Figure 4 As shown, the light through hole 21 is disposed through the first base 24 .

[0123] In some embodiments, Figure 4 , Figure 7 and Figure 8 As shown, Figure 8 for Figure 2 Exploded view of the mounting base 6 of the camera in FIG. The mounting base 6 includes two detachably connected first mounting bases 61 and two detachably connected second mounting bases 62; each first mounting base 61 is provided with a first groove 611, and the first grooves 611 on the two first mounting bases 61 are matched to form a first mounting hole 63, and the first lens 3 is arranged in the first mounting hole 63. Each second mounting base 62 is provided with a second groove 621, and the second grooves 621 on the two second mounting bases 62 are matched to form a second mounting hole 64, and the second lens 4 is arranged in the second mounting hole 64.

[0124] Since the first grooves 611 on the two first mounting seats 61 are matched to form the first mounting hole 63, when the first lens 3 is damaged, the two first mounting seats 61 are disassembled, and the first mounting hole 63 is divided into two first grooves 611, so that the difficulty of disassembling and assembling the first lens 3 from the first mounting hole 63 can be reduced, which is conducive to reducing the cost of repairing and replacing the first lens 3. Since the second grooves 621 on the two second mounting seats 62 are matched to form the second mounting hole 64, when the second lens 4 is damaged, the two second mounting seats 62 are disassembled, and the second mounting hole 64 is divided into two second grooves 621, so that the difficulty of disassembling and assembling the second lens 4 from the second mounting hole 64 can be reduced, which is conducive to reducing the cost of repairing and replacing the second lens 4.

[0125] The two first mounting seats 61 can be detachably connected together by means of snap connection, screw connection, plug-in connection, etc. For example, a plug-in column is provided on the joint surface of one of the first mounting seats 61, and a plug-in hole is provided on the joint surface of the other first mounting seat 61, and the plug-in column is inserted into the plug-in hole to enable the two first mounting seats 61 to be plug-in connected. The detachable connection method between the two second mounting seats 62 can be specifically set with reference to the detachable connection method of the two first mounting seats 61, and will not be repeated here.

[0126] In some embodiments, Figure 4 and Figure 8 As shown, an extension wall 67 is formed at the edge of each first mounting seat 61 and the edge of each second mounting seat 62, respectively, extending toward one side of the light entrance window 11, and the extension walls 67 on the two first mounting seats 61 and the two second mounting seats 62 form a limiting cylinder 68, and the first base 24 and the second base 25 are both arranged in the limiting cylinder 68. In this way, the limiting cylinder 68 has a limiting effect on the first base 24 and the second base 25, so that the first base 24 and the second base 25 are installed more firmly with the mounting seat 6.

[0127] The first base 24 and the second base 25 can be detachably connected to the inner wall of the limiting cylinder 68 by means of screw connection, snap connection, plug-in connection, etc., which are not specifically limited here.

[0128] Of course, the mounting base 6 can also be designed as an integrated structure, and the mounting base 6 is provided with a first mounting hole 63 for accommodating the first lens 3, and a second mounting hole 64 for accommodating the second lens 4. During installation, the first lens 3 is installed into the first mounting hole 63 from one end of the first mounting hole 63, and the second lens 4 is installed into the second mounting hole 64 from one end of the second mounting hole 64.

[0129] In some embodiments, Figure 4 and Figure 8 As shown, a plurality of first annular grooves 65 are provided on the hole wall of the first mounting hole 63, and the plurality of first annular grooves 65 are arranged along the axial direction of the first mounting hole 63, and the first annular grooves 65 are provided around the hole axis of the first mounting hole 63. By providing a plurality of first annular grooves 65, the contact area between the first lens 3 and the hole wall of the first mounting hole 63 is reduced, which is conducive to reducing the friction between the first lens 3 and the hole wall of the first mounting hole 63, thereby making the installation of the first lens 3 smoother. At the same time, by providing a plurality of first annular grooves 65, a plurality of elastic walls can be formed in the first mounting hole 63, and the elastic walls can absorb the tolerance of the size of the first lens 3 by elastic deformation, so that the first lens 3 can be smoothly installed in the first mounting hole 63.

[0130] In some embodiments, Figure 4 and Figure 8As shown, a plurality of second annular grooves 66 are provided on the hole wall of the second mounting hole 64, and the plurality of second annular grooves 66 are arranged along the axial direction of the second mounting hole 64, and the second annular grooves 66 are provided around the hole axis of the second mounting hole 64. By providing a plurality of second annular grooves 66, the contact area between the second lens 4 and the hole wall of the second mounting hole 64 is reduced, which is conducive to reducing the friction between the second lens 4 and the hole wall of the second mounting hole 64, thereby making the installation of the second lens 4 smoother. At the same time, by providing a plurality of second annular grooves 66, a plurality of elastic walls can be formed in the second mounting hole 64, and the elastic walls can absorb the tolerance of the size of the second lens 4 by elastic deformation, so that the second lens 4 can be smoothly installed in the second mounting hole 64.

[0131] In the embodiment of the present application, the reflective surface 20 of the reflective portion 2 may include not only the first reflective surface 22 but also the second reflective surface 23. Alternatively, the reflective surface 20 may include only the first reflective surface 22, that is, no reflective surface 23 is provided. Figure 4 The second reflective surface 23 in the optical system 10 is provided, the light hole 21 is provided on the first reflective surface 22 and is provided toward the light entrance window 11, the light entrance end of the first lens 3 is provided toward the first reflective surface 22, and the optical axis 30 of the first lens 3 and the optical axis 40 of the second lens 4 are provided at 90°. In order to ensure that the first lens 3 can relatively completely receive the light beam reflected by the first reflective surface 22, the first reflective surface 22 can be provided as an off-axis parabola.

[0132] In the embodiment of the present application, the installation structure of the first photosensitive element 200 and the second photosensitive element 300 is not unique. In some embodiments, such as Figure 4 , Fig. 9 and Fig.10 As shown, Fig. 9 for Figure 2 The structural diagram of the camera after removing the first photosensitive element 200 and the second photosensitive element 300, Fig.10 Schematic diagram of the installation of the first photosensitive element 200 and the second photosensitive element 300 in some embodiments of the present application. The housing 1 is provided with a mounting opening 13, and a fixing member 400 is detachably provided at the mounting opening 13. The fixing member 400 is a plate-shaped structure, and a circuit board 500 is provided on the inner surface of the fixing member 400. The first photosensitive element 200 and the second photosensitive element 300 are both arranged on the circuit board 500. With such a design, when the first photosensitive element 200 or the second photosensitive element 300 is damaged, the fixing member 400 can be removed from the housing 1 to facilitate the replacement of the first photosensitive element 200 or the second photosensitive element 300. At the same time, the first photosensitive element 200 and the second photosensitive element 300 are arranged on the fixing member 400, which is conducive to reducing the space occupied by the mounting structure of the first photosensitive element 200 and the second photosensitive element 300, thereby helping to reduce the volume of the camera.

[0133] The fixing plate may be detachably connected to the housing 1 at the mounting opening 13 by means of snap connection, screw connection, plug-in connection, bonding, etc., which are not specifically limited here.

[0134] In addition to the above-mentioned mounting structures, the first photosensitive element 200 and the second photosensitive element 300 may also adopt the following mounting structures: Figure 6a As shown, the fixing member 400 is a shell 1 structure, the first photosensitive element 200, the second photosensitive element 300 and the circuit board 500 are arranged inside the fixing member 400, and one side of the fixing member 400 has a socket 410 for the shell 1 of the optical lens 100 to be detachably inserted.

[0135] In the embodiments of the present application, the structure of the infrared lens is not unique. In some embodiments, such as Figure 4 and Fig.11 As shown, Fig.11 for Figure 4 The infrared lens is shown in the structural diagram of the infrared lens. The infrared lens includes a first lens group 41, a second lens group 42, a third lens group 43 and a fourth lens group 44 arranged from the object side to the image side; the first lens group 41 and the third lens group 43 have positive optical power, the second lens group 42 and the fourth lens group 44 have negative optical power, and the second lens group 42 and the third lens group 43 are both double-cemented lenses.

[0136] By alternately arranging the positive and negative lens groups, the aberrations produced by the positive lens group can be offset by the aberrations produced by the negative lens group, thereby correcting aberrations such as chromatic aberration, spherical aberration, and field curvature of the infrared lens. At the same time, the second lens group 42 and the third lens group 43 are arranged as double-cemented lenses, which can further correct aberrations such as chromatic aberration, spherical aberration, and so on of the infrared lens, thereby helping to improve the imaging quality of the infrared lens.

[0137] Among them, Fig.11 As shown, the infrared lens further includes a lens housing 45, which is cylindrical, and the first lens group 41, the second lens group 42, the third lens group 43 and the fourth lens group 44 are all arranged in the lens housing 45. In order to make the first lens group 41, the second lens group 42, the third lens group 43 and the fourth lens group 44 more firmly fixed in the lens housing 45, as shown in FIG. Fig.11 As shown, a first limiting ring groove 451, a second limiting ring groove 452 and a third limiting ring groove 453 are provided on the inner wall of the lens housing 45, the edge of the first lens group 41 and the edge of the second lens group 42 both extend into the first limiting ring groove 451, the edge of the third lens group 43 extends into the second limiting ring groove 452, and the edge of the fourth lens group 44 extends into the third limiting ring groove 453.

[0138] In some embodiments, Fig.11As shown, the first lens group 41 includes a positive lens L1. Such a design can reduce the number of lenses of the infrared lens and reduce the weight of the infrared lens. Of course, the first lens group 41 can also be provided with multiple positive lenses according to actual conditions.

[0139] In some embodiments, Fig.11 As shown, the second lens group 42 includes two negative lenses cemented together, namely negative lens L2 and negative lens L3. Of course, the second lens group 42 can also be configured as a negative lens and a positive lens cemented together.

[0140] In some embodiments, Fig.11 As shown, the third lens group 43 includes a negative lens L4 and a positive lens L5 that are glued together. In the third lens group 43, the negative lens L4 is located on the side of the positive lens L5 close to the second lens group 42. Of course, the third lens group 43 can also be set as two positive lenses glued together.

[0141] In some embodiments, Fig.11 , Fig.12 and Fig.13 As shown, Fig.12 is a light path diagram of the optical lens 100 in the embodiment of the present application, Fig.13 for Fig.12 Light path diagram of the mid-infrared lens. The fourth lens group 44 includes a negative lens L6, and the object side surface S9 and the image side surface S10 of the negative lens L6 are both curved toward the image side. The negative lens L6 is located at a position of the infrared lens close to the photosensitive surface of the second photosensitive element 300, so that the negative lens L6 acts as a field lens, thereby correcting aberrations such as field curvature and distortion of the infrared lens. At the same time, the image side surface S10 of the negative lens L6 is set to be curved toward the image side, so that the image side surface S10 of the negative lens L6 can deflect the reflected light of the object side surface S9 and other lens groups toward the edge of the photosensitive surface of the second photosensitive element 300, which can effectively reduce the interference of the reflected light on the imaging of the second photosensitive element 300, thereby improving the anti-reflection performance of the infrared lens, and further improving the imaging quality of the infrared lens. In addition, by bending the object side surface S9 and the image side surface S10 of the negative lens L6 toward the image side, it is possible to avoid forming sharp edges and corners in the edge region of the negative lens L6, thereby avoiding stress concentration in the edge region of the negative lens L6, thereby improving the strength and durability of the negative lens L6.

[0142] In some embodiments, Fig.11 , Fig.12 and Fig.13 As shown, Fig.12 is a light path diagram of the optical lens 100 in the embodiment of the present application, Fig.13 for Fig.12Light path diagram of mid-infrared lens. On the optical axis 40 of the infrared lens, the distance between the third lens group 43 and the fourth lens group 44 is greater than the distance between the second lens group 42 and the third lens group 43. That is, the distance between the third lens group 43 and the fourth lens group 44 on the optical axis 40 of the infrared lens is increased. With such a design, the distance between the third lens group 43 and the fourth lens group 44 is increased while keeping the diameter of the fourth lens group 44 and the size of the second photosensitive element 300 unchanged. The combined focal length of the third lens group 43 needs to be designed to be larger accordingly, so that the thickness of the third lens group 43 can be designed to be thinner (this is because the thinner positive lens has weaker convergence ability and longer focal length), thereby reducing the weight of the third lens group 43, and further reducing the weight of the optical lens 100.

[0143] In some embodiments, Fig.11 , Fig.12 and Fig.13 As shown, along the direction from the object side to the image side, the object side surface of the first lens of the third lens group 43 constitutes a first aperture stop. Fig.11 The object side surface S6 of the negative lens L4 of the third lens group 43 shown in the figure constitutes a first aperture stop. By setting the first aperture stop on the surface of the lens in the third lens group 43, it is not only possible to correct aberrations such as distortion and coma of the infrared lens, thereby improving the imaging quality of the infrared lens, but also it is unnecessary to set an aperture stop separately, thereby helping to reduce the number of parts of the infrared lens, and further helping to simplify the structure of the infrared lens.

[0144] Among them, Fig.11 As shown, the negative lens L4 of the third lens group 43 can form a first aperture stop by coating a light-shielding coating on an edge region of the object-side surface S6.

[0145] The following will Figure 4 and Fig.11 The main parameters of the infrared lens shown in are listed in the following table:

[0146] The standard surface in the table is a spherical surface; the surface number S in the "thickness" parameter series in the table is n The corresponding value means the surface number S n Surface to surface number S n+1The distance of the surface on the optical axis, for example, the thickness number corresponding to the surface numbered S1 is 18.935mm, and 18.935mm means the distance on the optical axis from the surface numbered S1 to the surface numbered S2; the radius of curvature in the table is the radius of curvature of the surface corresponding to the surface number at the optical axis; the surface with a positive radius of curvature value represents that the surface is curved toward the object side, and the surface with a negative radius of curvature value represents that the surface is curved toward the image side; the "+" in the "optical power" parameter series in the table represents positive optical power, and the "-" represents negative optical power. In the second lens group 42, the material corresponding to the negative lens L2 is chalcogenide glass, and the material corresponding to the negative lens L3 is calcium fluoride glass. In the third lens group 43, the material corresponding to the negative lens L4 is magnesium fluoride glass, and the material corresponding to the positive lens L5 is barium flint glass.

[0147]

[0148] Of course, the materials of each lens in the infrared lens are not limited to the materials listed in the above table, and other materials can be selected according to actual conditions. Fig.11 The lens structure in the infrared lens can also be set to Petzval objective lens, Cooke three-piece objective lens, double Gauss objective lens, Tessar objective lens, Helia objective lens, etc., which can be determined according to actual conditions.

[0149] In the embodiments of the present application, the structure of the visible light lens is not unique. In some embodiments, such as Fig.14 As shown, Fig.14 for Figure 4 The structure diagram of the visible light lens is shown in FIG. The visible light lens comprises a first convex lens 31, a first double cemented lens 32, a second aperture stop 33, a second double cemented lens 34 and a second convex lens 35 arranged in the direction from the object side to the image side, and the first double cemented lens 32 and the second double cemented lens 34 have positive optical power. With such a design, the lenses on both sides of the second aperture stop 33 form an approximately symmetrical structure, which can well correct the aberrations of the visible light lens such as coma, distortion, chromatic aberration, etc., thereby facilitating the improvement of the imaging quality of the visible light lens.

[0150] Among them, Fig.14 As shown, the visible light lens further includes a mounting shell 36, which is cylindrical, and the first convex lens 31, the first double-cemented lens 32, the second aperture stop 33, the second double-cemented lens 34, and the second convex lens 35 are all arranged in the mounting shell 36. In order to make the first convex lens 31, the first double-cemented lens 32, the second aperture stop 33, the second double-cemented lens 34, and the second convex lens 35 more firmly fixed in the lens housing 45, as shown in FIG. Fig.14As shown, the inner wall of the lens housing 45 is provided with a first positioning ring groove 361, a second positioning ring groove 362, a third positioning ring groove 363, a fourth positioning ring groove 364 and a fifth positioning ring groove 365, the edge of the first convex lens 31 extends into the first positioning ring groove 361, the edge of the first double-cemented lens 32 extends into the second positioning ring groove 362, the edge of the second aperture diaphragm 33 extends into the third positioning ring groove 363, the edge of the second double-cemented lens 34 extends into the fourth positioning ring groove 364, and the edge of the second convex lens 35 extends into the fifth positioning ring groove 365.

[0151] In some embodiments, Fig.14 and Fig.15 As shown, Fig.15 for Fig.12 The optical path diagram of the visible light lens. On the optical axis of the visible light lens, the first double-cemented lens 32 and the second double-cemented lens 34 both include a concave lens and a convex lens that are glued together; on the optical axis 30 of the visible light lens, the thickness of the second double-cemented lens 34 is greater than the thickness of the first double-cemented lens 32, and the thickness of the convex lens of the second double-cemented lens 34 is greater than the thickness of the convex lens of the first double-cemented lens 32, that is, the overall thickness of the second double-cemented lens 34 and the thickness of the convex lens of the second double-cemented lens 34 are set to be larger. Such a setting can make the second double-cemented lens 34 have a stronger convergence ability, which can be beneficial to reducing the combined focal length of the second double-cemented lens 34, thereby shortening the size of the second double-cemented lens 34 and the second convex lens 35 on the optical axis 30, and further shortening the size of the visible light lens on the optical axis 30, so that the occupied space of the visible light lens can be reduced and the weight of the visible light lens can be reduced.

[0152] In some embodiments, Fig.14 and Fig.15 As shown, on the optical axis 30 of the visible light lens, the spacing between the second doublet lens 34 and the second aperture diaphragm 33 is smaller than the spacing between the first doublet lens 32 and the second aperture diaphragm 33, that is, the spacing between the second doublet lens 34 and the second aperture diaphragm 33 is set to be smaller. In this way, the diameter of the first light beam 51 received by the second doublet lens 34 can be smaller (this is because the farther the first light beam 51 is from the second aperture diaphragm 33 after passing through the second aperture diaphragm 33, the greater the diameter divergence of the first light beam 51, and the closer the first light beam 51 is to the second aperture diaphragm 33, the smaller the diameter divergence of the first light beam 51). Then, the diameters of the second doublet lens 34 and the second convex lens 35 can be designed to be smaller, thereby reducing the weight of the second doublet lens 34 and the second convex lens 35, and further reducing the weight of the visible light lens.

[0153] The following will Figure 4 and Fig.14The main parameters of the reflector 2 and the visible light lens shown in are listed in the following table:

[0154] The standard surface in the table is a spherical surface. The surface number S in the "Thickness" parameter series in the table n The corresponding value means the surface number S n Surface to surface number S n+1 The distance of the surface on the optical axis, such as surface number S 13 The thickness number corresponding to the surface is 7.457mm, and 7.457mm means the surface number S 13 Surface to surface number S 14 In the table, the surface numbered S18 is the median surface of the first aperture stop along the thickness direction.

[0155] The radius of curvature in the table is the radius of curvature of the surface with the corresponding surface number at the optical axis; a surface with a positive radius of curvature represents that the surface is curved toward the object side, a surface with a negative radius of curvature represents that the surface is curved toward the image side, a surface with a radius of curvature of Infinity represents that the surface is a plane, and the radius of curvature is infinite; the "+" in the "optical power" parameter series in the table represents positive optical power. The material corresponding to the convex lens of the first double-cemented lens 32 is barium flint glass, and the material corresponding to the concave lens of the first double-cemented lens 32 is lanthanum dense flint glass; the material corresponding to the concave lens of the second double-cemented lens 34 is high borosilicate glass, and the material corresponding to the convex lens of the second double-cemented lens 34 is vacuum-resistant glass.

[0156]

[0157] Of course, the materials of each lens of the visible light lens are not limited to the materials listed in the above table, and other materials can be selected according to actual conditions. Fig.14 In the lens structure, the visible light lens can also be set to a Petzval objective lens, a Cooke three-piece objective lens, a Tessar objective lens, a Helia objective lens, etc., which can be determined according to actual conditions.

[0158] like Fig.16 As shown, Fig.16 This is a principle block diagram of an imaging device in some embodiments of the present application, wherein the imaging device includes a processor 710, a display screen 720, and the camera 600 described in any of the above embodiments; the processor 710 is used to fuse the image acquired by the first photosensitive element 200 with the image acquired by the second photosensitive element 300 to form a fused image, and the display screen 720 is used to display the fused image.

[0159] With such a setting, the complementarity of the characteristic information of the visible light image and the infrared image can be fully utilized, and the information of the infrared image and the visible light image can be fused to form a fused image and displayed through the display screen 720. In this way, the user can obtain the detailed characteristic information of the target object in a low-recognition environment (such as bad weather such as rain and snow) through the fused image, thereby enhancing the user's observation and recognition capabilities.

[0160] Since the imaging device includes the camera 600 described in any of the above embodiments, the beneficial effects of the imaging device are the same as the beneficial effects of the camera 600 in any of the above embodiments, which will not be repeated here.

[0161] The type of the imaging device is not unique. In some embodiments, such as Fig.17 As shown, Fig.17 The following is an illustration of the application scenarios of the camera 600 in some embodiments of the present application. Figure 1 The imaging device is an imaging device for vehicle assisted driving. The camera 600 is used to be installed at the front end of the vehicle 800. The dotted line in the figure is the field of view of the camera 600. The display screen 720 is set in the cab of the vehicle 800. By installing the camera 600 at the front end of the vehicle 800, it is possible to avoid the vehicle body from blocking the field of view of the camera 600, ensuring that the field of view of the camera 600 meets the driving requirements. In this way, the driver can better obtain the fused image of the target object in front of the vehicle 800 through the display screen 720, so as to improve the driver's ability to identify the target object in front in a low-recognition environment, thereby improving driving safety.

[0162] The camera 600 can be installed on the front end of the vehicle 800 or on the top wall of the vehicle 800. Fig.18 As shown, Fig.18 The following is an illustration of the application scenarios of the camera 600 in some embodiments of the present application. Figure 2 The camera 600 is used to be installed at the front edge of the top wall of the vehicle 800. Such an arrangement can minimize the obstruction of the field of view of the camera 600 by the top wall of the vehicle 800, thereby ensuring that the field of view of the camera 600 meets the driving requirements.

[0163] The imaging device is not limited to being an imaging device for assisting driving of a vehicle, but may also be an imaging device for assisting driving of other movable vehicles, wherein the movable vehicles may be ships, airplanes, etc.

[0164] In other embodiments, Fig.19 As shown, Fig.19 Schematic diagram of application scenarios of the camera 600 in some embodiments of the present application Figure 3The imaging device is an imaging device of a medical auxiliary examination device. The imaging device includes a light source 900, a camera 600 and a terminal device, wherein the terminal device includes a processor 710 and a display screen 720. The light source 900 is used to emit visible light and infrared light to the target part. The light entrance window 11 of the camera 600 is used to receive the visible light and infrared light reflected by the target part.

[0165] The target part may be an internal organ of the human body, such as the intestine, stomach, bladder, etc. The terminal device may be a terminal device capable of displaying images, such as a computer or a mobile phone. The light source 900 includes a visible light source 900 and an infrared light source 900, and both the visible light source 900 and the infrared light source 900 may be LED (Light-Emitting Diode; light-emitting diode) lamps.

[0166] With such an arrangement, medical personnel can discover detail features that are easily overlooked by the human eye or under ordinary medical imaging conditions through the fused image displayed on the display screen 720, and can mark the location of abnormal parts to facilitate auxiliary medical personnel to quickly find abnormal parts for diagnosis and treatment, thereby helping to improve the work efficiency of medical personnel and reduce the pain and burden of patients.

[0167] The following is an explanation and description of the relevant technical terms involved in the embodiments of the present application.

[0168] Focal power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam. It characterizes the ability of an optical lens to deflect light. A lens or lens group with positive focal power has a positive focal length and has the effect of converging light. A lens or lens group with negative focal power has a negative focal length and has the effect of diverging light.

[0169] Convex lens, also known as converging lens or positive lens, is a lens that is thicker in the middle and thinner at the edges. Convex lens has the function of converging light. Convex lens is divided into biconvex, plano-convex and concave-convex (or positive meniscus) forms.

[0170] Concave lens, also called diverging lens or negative lens, is a lens that is thin in the middle and thick at the edges. Concave lens has a diverging effect on light. Concave lenses are divided into double concave, plano-concave, convex-concave and other forms.

[0171] Focal length is a measurement method for measuring the convergence or divergence of light in an optical system. It refers to the distance from the optical center of the lens to the focus of light convergence when parallel light is incident. Generally speaking, the focal length is the distance from the center of the lens to the focus. But this is only the case of a single thin lens. Since the optical lens of the imaging device is composed of many lenses, the situation is far from that simple. The focal length of the optical lens is divided into the image focal length and the object focal length. The image focal length is the distance from the image principal surface to the image focus. Similarly, the object focal length is the distance from the object principal surface to the object focus. The focal length described in the embodiment of the present application refers to the image focal length. When the incident parallel light (or its extension) intersects with the outgoing converging light (or its extension), the image principal surface can be determined. The intersection of the image principal surface and the optical axis of the optical lens is the image principal point. The distance between the image principal point and the focal plane (focus) formed by the infinite light is called the focal length of the optical lens (also called the effective focal length). The object principal surface and the object focal length can also be determined by the same principle.

[0172] The optical axis refers to the center line of the light beam (light column). The optical properties of the light beam do not change when it rotates around this axis. The optical axis also refers to the axis of symmetry of the optical system. For example, the optical axis of a lens is the axis passing through the center of each lens of the lens.

[0173] The object side surface, with the lens as the boundary, the side where the photographed object is located is called the object side, and the surface of the lens close to the object side is called the object side surface.

[0174] The image side surface, with the lens as the boundary, the side where the image of the object is located is called the image side, and the surface of the lens close to the image side is called the image side surface.

[0175] An aperture is an entity that limits the light beam in an optical system. The aperture can be the edge of a lens, a frame, or a specially set screen with holes. The function of an aperture can be divided into two aspects: limiting the light beam or limiting the size of the field of view (imaging range). The aperture that limits the light beam the most in an optical system is called an aperture aperture, and the aperture that limits the field of view (size) the most is called a field aperture.

[0176] Aberration (full name: chromatic aberration, aberration) refers to the inconsistency between the results obtained by non-paraxial ray tracing and the results obtained by paraxial ray tracing in an actual optical system, and the deviation from the ideal state of Gaussian optics (first-order approximation theory or paraxial rays). Aberrations include spherical aberration, coma, field curvature, astigmatism, distortion, chromatic aberration, and wave aberration.

[0177] Spherical aberration, also known as spherical aberration, is caused by the different light convergence capabilities of the central area and the edge area of ​​the lens. After passing through the optical system, the light beam emitted by the object point on the axis intersects the optical axis at different positions with the light beams at different angles with the optical axis. Therefore, a circular diffuse spot is formed on the image plane, which is spherical aberration. Spherical aberration is generally measured by the axial distance between the intersection of the actual light beam on the image side and the optical axis relative to the intersection of the paraxial light beam and the optical axis (i.e., the Gaussian image point).

[0178] Coma is a monochromatic aberration of an off-axis point. If a monochromatic conical light beam emitted from an off-axis object point outside the optical axis to an optical system cannot form a clear point at the ideal plane after being refracted by the optical system, but forms a comet-shaped light spot with a bright tail, then the imaging error of this optical system is called coma.

[0179] Chromatic Aberration (CA) refers to the phenomenon that the lens cannot focus all wavelengths of light on the same point in optics. It occurs because the lens has different refractive indices for different wavelengths of light (dispersion phenomenon). For light with longer wavelengths, the refractive index of the lens is lower. In imaging, chromatic aberration appears as a colored "edge" at the junction of the high light area and the low light area. This is because the focal length of the lens is related to the refractive index, so each color on the spectrum cannot be focused on the same point on the optical axis. There are two types of chromatic aberration: axial chromatic aberration and vertical chromatic aberration.

[0180] Axial chromatic aberration: also called spherical chromatic aberration or positional chromatic aberration, refers to the fact that the focal points of light beams of different wavelengths are located at different positions along the axis after passing through the lens. Because the cause of its formation is similar to that of spherical aberration, it is also called spherical chromatic aberration.

[0181] Vertical chromatic aberration: Vertical chromatic aberration is also called magnification chromatic aberration. It refers to the different heights of light beams of different wavelengths in the off-axis field of view on the image plane after being focused by the lens. In other words, the magnification of each wavelength after imaging is different, so it is called magnification chromatic aberration.

[0182] Distortion, also known as distortion, is the degree of distortion of the image formed by an optical lens relative to the object itself. Distortion is the difference between the intersection of the main light of different fields of view with the Gaussian image plane after passing through the optical lens and the ideal image height. Therefore, distortion only changes the imaging position of the off-axis object point on the ideal plane, causing the shape of the image to be distorted, but does not affect the clarity of the image.

[0183] Field curvature is used to indicate the difference between the clearest image point position of the non-central field of view light after passing through the optical lens group and the clearest image point position of the central field of view on the optical axis. When the lens has field curvature, the intersection point of the entire light beam does not coincide with the ideal image point. Although a clear image point can be obtained at each specific point, the entire image plane is a curved surface.

[0184] The types of hatching lines in the drawings of the present application are intended to distinguish different components and should not be construed as limiting the materials of the components.

[0185] Although the description of this application will be introduced in conjunction with some embodiments, this does not mean that the features of this application are limited to the implementation mode. On the contrary, the purpose of introducing the application in conjunction with the implementation mode is to cover other options or modifications that may be extended based on the claims of this application. In order to provide a deep understanding of this application, many specific details will be included in the following description. This application can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of this application, some specific details will be omitted in the description. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other without conflict.

[0186] In the embodiments of the present application, the terms "first", "second", "third", "fourth", and "fifth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third", "fourth", and "fifth" may explicitly or implicitly include one or more of the features.

[0187] In the embodiments of the present application, "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0188] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The directional terms mentioned in the embodiments of the present application, such as "upper", "lower", "left", "right", "inside", "outside", etc., are only reference directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. "Multiple" means at least two.

[0189] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0190] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An optical lens, characterized in that: It comprises a housing, and a reflecting part, a first lens and a second lens arranged in the housing; The housing is provided with a light entrance window, the light entrance window is used for allowing a light beam to enter the housing, the light beam includes visible light and infrared light; The reflecting portion has a reflecting surface, and a light-through hole is provided on the reflecting surface. The reflecting portion is used to reflect the light beam irradiated to the reflecting surface to form a first light beam; the light-through hole is used to allow the light beam irradiated to the light-through hole to enter to form a second light beam passing through the reflecting surface; The first lens is one of a visible light lens and an infrared lens, and is used to receive the first light beam; the second lens is the other of the visible light lens and the infrared lens, and is used to receive the second light beam.

2. The optical lens according to claim 1, characterized in that: The first lens is the visible light lens, and the second lens is the infrared lens; The area of ​​the reflective surface located at the periphery of the light-through hole is S1, and the opening area of ​​the light-through hole located at the reflective surface is S2; wherein S1 and S2 satisfy: 1≤S1 / S2≤6.

3. The optical lens according to claim 2, characterized in that: S1 / S2=5.

4. The optical lens according to any one of claims 1 to 3, characterized in that: The reflective surface includes a first reflective surface and a second reflective surface, the first reflective surface is used to reflect the light beam irradiated to the first reflective surface to the second reflective surface, and the second reflective surface is used to reflect the light beam reflected by the first reflective surface to form the first light beam; the light through hole is provided on the first reflective surface; Along the depth direction of the light through hole, the first lens is located on a side of the second reflective surface away from the light incident window, and a light incident end of the first lens is arranged toward the second reflective surface.

5. The optical lens according to claim 4, characterized in that: The first reflecting surface and the second reflecting surface are planes, and the first reflecting surface and the second reflecting surface have the same inclination angle relative to the depth direction of the light-through hole.

6. The optical lens according to claim 4, characterized in that: The first reflecting surface is a concave curved surface, and the second reflecting surface is located between the focus of the first reflecting surface and the first reflecting surface.

7. The optical lens according to claim 6, characterized in that: The first reflecting surface is an off-axis parabola, the second reflecting surface is a plane and is tilted relative to the depth direction of the light-through hole, and in a cross section perpendicular to the second reflecting surface and passing through the focus, the size of the second reflecting surface in the first direction is D2; D2 satisfies: D2 = D1 (QL) / Q: Among them, the first direction is a direction perpendicular to the first central axis; the first central axis is the central axis of the parabola on which the first reflecting surface is located; D1 is the size of the first reflecting surface in the first direction; Q is the distance from the center point of the first reflecting surface to the first central axis, and L is the distance from the center point of the first reflecting surface to the center point of the second reflecting surface in the first direction.

8. The optical lens according to claim 6 or 7, characterized in that: The first reflecting surface is an off-axis parabola, the second reflecting surface is a plane, and in a cross section perpendicular to the second reflecting surface and passing through the focus, an inclination angle θ of the second reflecting surface relative to the depth direction of the light-through hole satisfies: θ=90°-arc and{Q / [(R / 2)-(Q 2 / 2R)]} / 2: Among them, Q is the distance from the center point of the first reflecting surface to the first central axis, the first central axis is the central axis of the parabola where the first reflecting surface is located; R is the quasi-focal length of the parabola where the first reflecting surface is located.

9. The optical lens according to any one of claims 1 to 8, characterized in that: The light through hole is arranged toward the light incident window, and the light incident end of the second lens is arranged toward the light incident window.

10. The optical lens according to claim 9, characterized in that: The light entrance window is a hollow opening arranged on one side of the shell.

11. The optical lens according to any one of claims 1 to 10, characterized in that: The optical axis of the first lens and the optical axis of the second lens are both parallel to the depth direction of the light-through hole.

12. The optical lens according to any one of claims 1 to 11, characterized in that: The infrared lens includes a first lens group, a second lens group, a third lens group and a fourth lens group arranged in a direction from the object side to the image side; the first lens group and the third lens group have positive optical focal length, the second lens group and the fourth lens group have negative optical focal length, and the second lens group and the third lens group are both double-cemented lenses.

13. The optical lens according to claim 12, characterized in that: Along the direction from the object side to the image side, the object side surface of the first lens of the third lens group constitutes a first aperture stop.

14. The optical lens according to claim 12 or 13, characterized in that: The fourth lens group includes a negative lens, and both the object-side surface and the image-side surface of the negative lens are curved toward the image side.

15. The optical lens according to any one of claims 12 to 14, characterized in that: On the optical axis of the infrared lens, a distance between the third lens group and the fourth lens group is greater than a distance between the second lens group and the third lens group.

16. The optical lens according to any one of claims 1 to 15, characterized in that: The visible light lens comprises a first convex lens, a first doublet lens, a second aperture stop, a second doublet lens and a second convex lens arranged in a direction from the object side to the image side, wherein the first doublet lens and the second doublet lens have positive power; The first double-cemented lens and the second double-cemented lens both include a concave lens and a convex lens glued together; on the optical axis of the visible light lens, the thickness of the second double-cemented lens is greater than the thickness of the first double-cemented lens, and the thickness of the convex lens of the second double-cemented lens is greater than the thickness of the convex lens of the first double-cemented lens.

17. The optical lens according to claim 16, characterized in that: On the optical axis of the visible light lens, a distance between the second double-cemented lens and the second aperture stop is smaller than a distance between the first double-cemented lens and the second aperture stop.

18. The optical lens according to any one of claims 1 to 11, characterized in that: A mounting seat is detachably provided in the housing, and the reflecting part, the first lens, and the second lens are all detachably arranged on the mounting seat; The shell is provided with an assembly opening through which the mounting seat can pass, and a covering piece is detachably provided at the assembly opening, the covering piece covers part of the assembly opening, and the uncovered area of ​​the assembly opening constitutes the light entrance window.

19. The optical lens according to claim 18, characterized in that: The reflective surface includes a first reflective surface and a second reflective surface, the first reflective surface is used to reflect the light beam irradiated to the first reflective surface to the second reflective surface, and the second reflective surface is used to reflect the light beam reflected by the first reflective surface to form the first light beam; the light through hole is provided on the first reflective surface; The reflecting part comprises a first base, a second base, a first reflecting mirror having the first reflecting surface, and a second reflecting mirror having the second reflecting surface; the first reflecting mirror is arranged on the first base, and the second reflecting mirror is arranged on the second base; The first base and the second base are both detachably connected to the mounting base, a portion of the second base is located at the assembly opening to cover a portion of the assembly opening, and the second base is the covering member.

20. The optical lens according to claim 18 or 19, characterized in that: The mounting seat comprises two detachably connected first mounting seats and two detachably connected second mounting seats; A first groove is respectively provided on each of the first mounting seats, and the first grooves on the two first mounting seats are matched to form a first mounting hole, and the first lens is arranged in the first mounting hole; A second groove is respectively provided on each of the second mounting seats, and the second grooves on two second mounting seats are matched to form a second mounting hole, and the second lens is arranged in the second mounting hole.

21. The optical lens according to claim 20, characterized in that: A plurality of first annular grooves are provided on the hole wall of the first mounting hole, the plurality of first annular grooves are arranged along the axial direction of the first mounting hole, and the first annular grooves are arranged around the hole axis of the first mounting hole; A plurality of second annular grooves are provided on the hole wall of the second mounting hole. The plurality of second annular grooves are arranged along the axial direction of the second mounting hole. The second annular grooves are arranged around the hole axis of the second mounting hole.

22. A camera, characterized in that: It comprises a first photosensitive element, a second photosensitive element and the optical lens according to any one of claims 1 to 21; the photosensitive surface of the first photosensitive element is arranged toward the light output end of the first lens, and the photosensitive surface of the second photosensitive element is arranged toward the light output end of the second lens.

23. An imaging device, characterized in that: It comprises a processor, a display screen and the camera as claimed in claim 22; the processor is used to fuse the image acquired by the first photosensitive element with the image acquired by the second photosensitive element to form a fused image, and the display screen is used to display the fused image.

Images