Infrared lens assembly and infrared thermal imager

Abstract

The utility model discloses an infrared lens assembly and an infrared thermal imager, the infrared lens assembly at least comprises a lens barrel, an optical lens assembly and a laser ranging assembly, and the lens barrel is provided with a lens barrel cavity and a view window communicated with the lens barrel cavity; the optical lens assembly is arranged in the lens cone cavity, the optical lens assembly at least comprises a first infrared lens, the first infrared lens is installed on the view window, and the first infrared lens is provided with a laser transmitting and receiving area; the laser ranging assembly is arranged in the lens cone cavity and is adjacent to one side face, facing the lens cone cavity, of the first infrared lens, and the transmitting end and the receiving end of the laser ranging assembly correspond to the laser transmitting and receiving area and are used for transmitting and receiving of the laser ranging assembly. According to the infrared lens assembly, the laser ranging assembly is completely hidden behind the first infrared lens, and the first infrared lens does not need to be perforated, so that the effective clear aperture is ensured, and the imaging quality is ensured; the sealing performance is better; meanwhile, accurate distance measurement of a small-size object can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of infrared technology, in particular to an infrared lens assembly and an infrared thermal imager. BACKGROUND

[0002] Some existing infrared thermal imagers are provided with a laser ranging assembly, which can not only realize infrared imaging, but also measure the distance of the imaged object, and further determine the position of the object. The installation mode of some existing laser ranging assemblies is as follows.

[0003] For example, if the first lens of the objective lens of the infrared thermal imager is broken, a space is reserved for the laser ranging assembly, and the transmitting end and the receiving end of the laser ranging assembly are placed at the broken hole. However, the above-mentioned method not only blocks the effective clear aperture, but also reduces the total energy that can be accepted by the infrared detector, and the imaging quality such as illumination and resolving power is also reduced. Moreover, the air and water tightness at the broken hole (where the laser ranging module is installed) is poor, which easily leads to the failure of the sealing of the whole machine, affecting the use. CONTENT OF THE UTILITY MODEL

[0004] The present application provides an infrared lens assembly and an infrared thermal imager to solve the technical problem that the transmitting end and the receiving end of the existing laser ranging assembly are placed at the broken hole of the first lens of the objective lens of the infrared thermal imager, which not only blocks the effective clear aperture, but also reduces the total energy that can be accepted by the infrared detector, and the imaging quality such as illumination and resolving power is also reduced. Moreover, the air and water tightness at the broken hole (where the laser ranging module is installed) is poor, which easily leads to the failure of the sealing of the whole machine, affecting the use.

[0005] To solve the above-mentioned technical problem, the present application provides an infrared lens assembly, which at least comprises: a lens barrel provided with a lens barrel cavity and a viewing window communicating with the lens barrel cavity; an optical lens assembly arranged in the lens barrel cavity, the optical lens assembly at least comprising a first infrared lens, the first infrared lens being mounted on the viewing window, the first infrared lens being provided with a laser emission and reception area; and a laser ranging assembly arranged in the lens barrel cavity and adjacent to one side of the first infrared lens facing the lens barrel cavity, the transmitting end and the receiving end of the laser ranging assembly corresponding to the laser emission and reception area for the laser ranging assembly to emit and receive.

[0006] The first infrared lens comprises a first mirror surface and a second mirror surface arranged oppositely, the second mirror surface facing the lens barrel cavity, the laser emission and reception area comprises a first laser emission and reception area, the first laser emission and reception area comprises a first laser emission and reception surface and a second laser emission and reception surface arranged in parallel with the first laser emission and reception surface, the first laser emission and reception surface being arranged on the first mirror surface in a planar shape, and the second laser emission and reception surface being arranged on the second mirror surface in a planar shape.

[0007] The first infrared lens comprises a first mirror surface and a second mirror surface arranged oppositely, and the second mirror surface faces the lens barrel cavity.

[0008] The laser ranging assembly comprises a laser transceiver, and the laser transceiver is adjacent to the fourth laser emission and reception surface.

[0009] The first mirror surface is coated with a first anti-reflection film, and the second mirror surface is coated with a second anti-reflection film.

[0010] The laser emission and reception area is located in the central region of the first infrared lens, and the laser ranging assembly is adjacent to the central position of the side surface of the first infrared lens facing the lens barrel cavity.

[0011] The receiving optical axis of the optical lens assembly is coaxial with the emission optical axis of the laser ranging assembly.

[0012] The infrared lens assembly comprises at least two mounting brackets, one end of the at least two mounting brackets is arranged circumferentially on the inner side wall of the lens barrel, and the other end is connected to the outer periphery of the laser ranging assembly.

[0013] The optical lens assembly comprises at least a second infrared lens and a third infrared lens, the second infrared lens and the third infrared lens are both mounted in the lens barrel cavity, and the second infrared lens is located between the first infrared lens and the third infrared lens.

[0014] To solve the above technical problems, the present application provides an infrared thermal imager, which at least comprises: the above-mentioned infrared lens assembly; an infrared detector arranged in the lens barrel cavity and receiving infrared light of the optical lens assembly.

[0015] The beneficial effects of the present application are: different from the prior art, the present application provides an infrared lens assembly. The infrared lens assembly at least comprises a lens barrel, an optical lens assembly and a laser ranging assembly. The lens barrel is provided with a lens barrel cavity and a viewing window communicating with the lens barrel cavity. The optical lens assembly is arranged in the lens barrel cavity. The optical lens assembly at least comprises a first infrared lens. The first infrared lens is mounted on the viewing window. The first infrared lens is provided with a laser emission and reception area. The laser ranging assembly is arranged in the lens barrel cavity and is adjacent to one side surface of the first infrared lens facing the lens barrel cavity. The emission end and the receiving end of the laser ranging assembly correspond to the laser emission and reception area, and are used for emission and reception of the laser ranging assembly.

[0016] By the cooperation of the above lens barrel, lens barrel cavity, view window, first infrared lens, laser emission receiving area and laser ranging assembly, the laser ranging assembly is completely hidden behind the first infrared lens, that is, the first infrared lens does not need to be broken, which not only ensures the effective clear aperture, and further ensures the total energy that the infrared detector can accept, so as to ensure the imaging quality such as illumination and resolving power, and also ensures the sealing performance, without the need to set a relatively complex sealing structure, that is, the sealing performance of the infrared lens assembly is better, and the water-tight and air-tight effect is better; at the same time, the optical axis of the laser ranging assembly and the optical axis of the optical lens assembly are closer, and accurate ranging of small size objects can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work, wherein:

[0018] Figure 1 is a first partial schematic view of a first embodiment of the infrared lens assembly of the present application;

[0019] Figure 2 is a second partial schematic view of the first embodiment of the infrared lens assembly of the present application;

[0020] Figure 3 is a partial schematic view of a second embodiment of the infrared lens assembly of the present application;

[0021] Figure 4 is a structural schematic view of the first infrared lens in the second embodiment of the infrared lens assembly of the present application;

[0022] Figure 5 is a partial schematic view of a third embodiment of the infrared lens assembly of the present application.

[0023] Fig. 10, infrared lens assembly; 11, lens barrel; 111, lens barrel cavity; 12, optical lens assembly; 121, first infrared lens; 121a, first mirror surface; 121b, second mirror surface; 1211, first laser emission receiving area; 1211a, first laser emission receiving surface; 1211b, second laser emission receiving surface; 1212, second laser emission receiving area; 1212a, third laser emission receiving surface; 1212b, fourth laser emission receiving surface; 122, second infrared lens; 123, third infrared lens; 13, laser ranging assembly; 131, emission end; 132, receiving end; 14, mounting assembly; 141, mounting bracket; 20, infrared detector. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0025] Reference to "an embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments. It is explicitly contemplated that embodiments described herein can be combined with other embodiments.

[0026] The infrared lens assembly and the infrared thermal imager provided by the utility model will be described in detail below in combination with the embodiments.

[0027] Please refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 is a first partial schematic view of the first embodiment of the infrared lens assembly of the present application; Figure 2 is a second partial schematic view of the first embodiment of the infrared lens assembly of the present application; Figure 3 is a partial schematic view of the second embodiment of the infrared lens assembly of the present application. The present application provides an infrared lens assembly. The infrared lens assembly 10 at least includes a lens barrel (not shown in the figure), an optical lens assembly 12, and a laser ranging assembly 13. The lens barrel is provided with a lens barrel cavity (not shown in the figure) and a viewing window (not shown in the figure). The lens barrel cavity and the viewing window are communicatively arranged. The lens barrel cavity provides a mounting position for the optical lens assembly 12 and the laser ranging assembly 13. The viewing window serves as an observation window of the infrared lens assembly 10, wherein the viewing window is located at the front end of the lens barrel cavity.

[0028] The optical lens assembly 12 is arranged in the lens barrel cavity. The optical lens assembly 12 is detachably connected to the lens barrel cavity. The detachable manner can be, but is not limited to, clamping, plug-in, and bolt, etc. The optical lens assembly 12 at least includes a first infrared lens 121. The first infrared lens 121 can be used to receive and converge infrared light from the outside and transmit to the infrared detector 20 for imaging. The first infrared lens 121 is mounted to the viewing window. The first infrared lens 121 serves as the first objective lens of the optical lens assembly 12. The first infrared lens 121 can be mounted to the viewing window by clamping, plug-in, and bolt, etc. The first infrared lens 121 is provided with a laser emission and reception area. The laser emission and reception area can be used for laser light to pass through.

[0029] The laser ranging assembly 13 is arranged in the lens barrel cavity. The laser ranging assembly 13 is detachably connected in the lens barrel cavity. The detachable connection can be, but is not limited to, clamping, plug-in, and screwing, etc. The laser ranging assembly 13 is adjacent to the side of the first infrared lens 121 facing the lens barrel cavity. The emission end 131 and the receiving end 132 of the laser ranging assembly 13 correspond to the laser emission and receiving area. That is, the emission end 131 and the receiving end 132 of the laser ranging assembly 13 can emit and receive through the laser emission and receiving area.

[0030] Through the cooperation between the above lens barrel, lens barrel cavity, window, first infrared lens 121, laser emission and receiving area, and laser ranging assembly 13, the laser ranging assembly 13 is completely hidden behind the first infrared lens 121, that is, the first infrared lens 121 does not need to be broken. Not only ensures the effective clear aperture, but also ensures the total energy that the infrared detector 20 can accept, thereby ensuring the imaging quality such as illumination and resolution; and also ensures the sealing performance, without the need to set a relatively complex sealing structure, that is, the sealing performance of the infrared lens assembly 10 is better, and the water-tight and air-tight effects are better; at the same time, the optical axis of the laser ranging assembly 13 and the optical axis of the optical lens assembly 12 are closer, and accurate ranging of small-size objects can be realized.

[0031] The above laser emission and receiving area can have various setting modes on the first infrared lens 121, as long as it can ensure that the laser ranging assembly 13 emits and receives laser light through the laser emission and receiving area, and the specific setting mode is not limited.

[0032] The first laser emission and receiving area setting mode is as follows. The first infrared lens 121 includes a first mirror surface 121a and a second mirror surface 121b. The first mirror surface 121a and the second mirror surface 121b are arranged opposite to each other. The second mirror surface 121b faces the lens barrel cavity, and the first mirror surface 121a faces away from the lens barrel cavity. The laser emission and receiving area includes a first laser emission and receiving area 1211. The first laser emission and receiving area 1211 is used for the laser ranging assembly 13 to emit and receive laser. The first laser emission and receiving area 1211 includes a first laser emission and receiving surface 1211a and a second laser emission and receiving surface 1211b. The first laser emission and receiving surface 1211a and the second laser emission and receiving surface 1211b are arranged in parallel. The first laser emission and receiving surface 1211a is arranged on the first mirror surface 121a. The first laser emission and receiving surface 1211a is arranged in a planar manner. The first laser emission and receiving surface 1211a can be machined on the existing first infrared lens 121. The second laser emission and receiving surface 1211b is arranged on the second mirror surface 121b. The second laser emission and receiving surface 1211b is arranged in a planar manner. The second laser emission and receiving surface 1211b can be machined on the existing first infrared lens 121.

[0033] By directly physically processing the first infrared lens 121 of the existing glass optical power and forming the above-mentioned planar first laser emission and reception surface 1211a and the planar second laser emission and reception surface 1211b, the emission and reception of the laser ranging assembly 13 can be facilitated, thereby improving the ranging performance of the laser ranging assembly 13, and further reducing the risk of misalignment or failure of the laser ranging assembly 13. The first laser emission and reception surface 1211a and the second laser emission and reception surface 1211b can be, but are not limited to, circular and elliptical, as long as they can ensure that the first laser emission and reception surface 1211a and the second laser emission and reception surface 1211b are used for the laser ranging assembly 13 to emit and receive laser.

[0034] Please refer to Figure 4 , Figure 4 is a structural schematic view of the first infrared lens in the second embodiment of the infrared lens assembly of the present application. In combination with Figures 1 to 3 , the second laser emission and reception area is set as follows. The first infrared lens 121 includes a first mirror surface 121a and a second mirror surface 121b. The second mirror surface 121b faces the lens barrel cavity, and the first mirror surface 121a faces away from the lens barrel cavity. The first mirror surface 121a and the second mirror surface 121b are oppositely arranged. The laser emission and reception area includes a second laser emission and reception area 1212. The second laser emission and reception area 1212 is used for the laser ranging assembly 13 to emit and receive laser. The second laser emission and reception area 1212 includes a third laser emission and reception surface 1212a and a fourth laser emission and reception surface 1212b. The third laser emission and reception surface 1212a is convexly arranged on the surface of the first mirror surface 121a. The fourth laser emission and reception surface 1212b is concavely arranged on the surface of the second mirror surface 121b.

[0035] The first infrared lens 121 described above is different from the existing first infrared lens 121. The first infrared lens 121 designed initially not only meets the optical parameters of the optical lens assembly 12, but also meets the optical parameters of the laser ranging assembly 13. That is, the first infrared lens 121 has two functions at the same time. One is used for the infrared detector 20 to emit and receive, provides illumination, and is used for infrared imaging. The other is used as a transmission window (not shown in the figure) and a receiving window (not shown in the figure) of the laser ranging assembly 13, and is used for laser ranging without secondary processing.

[0036] By the above-mentioned way, the first infrared lens 121 is compatible with two functions at the same time, which can facilitate the emission and reception of the laser ranging assembly 13, thereby improving the ranging performance of the laser ranging assembly 13, and further reducing the risk of misalignment or failure of the laser ranging assembly 13.

[0037] Specifically, when the first infrared lens 121 has two functions at the same time, the laser ranging assembly 13 comprises a laser transceiver (not shown in the figure). The laser transceiver is used for transmitting and receiving laser light. The laser transceiver is in close proximity to the fourth laser transmitting and receiving surface 1212b. The laser ranging assembly 13 described above can only comprise a laser transceiver without a laser lens (not shown in the figure). By having the first infrared lens 121 having two functions at the same time, the use of the laser lens can be reduced, not only reducing the cost, but also improving the installation accuracy, etc.

[0038] In addition to the two above-mentioned setting modes, the laser transmitting and receiving area can have other multiple setting modes, which are not limited here.

[0039] In some embodiments, the surface of the first mirror surface 121a away from the second mirror surface 121b is coated with a first anti-reflection film (not shown in the figure). The surface of the second mirror surface 121b away from the first mirror surface 121a is coated with a second anti-reflection film (not shown in the figure). The first anti-reflection film is used for the required waveband and infrared waveband of the laser ranging assembly 13 to pass through. The second anti-reflection film is used for the required waveband and infrared waveband of the laser ranging assembly 13 to pass through. Among them, the first anti-reflection film and the second anti-reflection film can be the same. By limiting the first anti-reflection film and the second anti-reflection film to pass through the required waveband and infrared waveband of the laser ranging assembly 13, the input and output of energy can be maximized, thereby reducing energy loss. The first infrared lens 121 described above can be a chalcogenide glass.

[0040] The required waveband of the laser ranging assembly 13 described above can be different depending on the type of the laser ranging assembly 13. The required waveband of the laser ranging assembly 13 can be a visible light waveband and a short-wave infrared, etc. Among them, the visible light waveband can be but not limited to 850nm, 905nm, 940nm, etc. The infrared waveband can be greater than or equal to 8μm and less than or equal to 12μm. Among them, the infrared waveband can be but not limited to 8μm, 8.5μm, 9μm, 9.5μm, 10μm, 10.5μm, 12μm, 12.5μm and 12μm, etc.

[0041] Please refer to Figure 5 , Figure 5 is a partial schematic view of the third embodiment of the infrared lens assembly of the present application. In combination with Figures 1 to 4In some embodiments, the laser emission and receiving area is located in the central region of the first infrared lens 121. The laser ranging assembly 13 is located at the center of the side of the first infrared lens 121 adjacent to the lens barrel cavity. That is, the laser ranging assembly 13 is suspended at the center of the back of the first infrared lens 121. Through the above arrangement, not only can the distance between the optical axis of the optical lens assembly 12 and the optical axis of the laser ranging assembly 13 be further reduced, thereby enabling more accurate ranging of smaller size objects, but also the distance between the laser beam and the target can be reduced, thereby improving the accuracy and repeatability of the measurement.

[0042] In the present embodiment, the first laser emission and receiving area 1211 is located in the central region of the first infrared lens 121. The laser ranging assembly 13 is located at the center of the second mirror surface 121b of the first infrared lens 121 adjacent to the lens barrel cavity. The second laser emission and receiving area 1212 is located in the central region of the first infrared lens 121. The laser ranging assembly 13 is located at the center of the second mirror surface 121b of the first infrared lens 121 adjacent to the lens barrel cavity.

[0043] Specifically, the receiving optical axis (not shown in the figure) of the optical lens assembly 12 is coaxial with the emission optical axis (not shown in the figure) of the laser ranging assembly 13, that is, the receiving optical axis of the optical lens assembly 12 and the emission optical axis of the laser ranging assembly 13 are arranged in coincidence. When the receiving optical axis of the optical lens assembly 12 and the emission optical axis of the laser ranging assembly 13 coincide, the following effects can be achieved. First, the calibration process can be simplified, reducing the adjustment steps and difficulty required during debugging and installation. Second, after calibration, the system can ensure that the laser beam is directly aligned with the target, thereby improving the accuracy and repeatability of the measurement, and enabling accurate ranging of small size objects or objects with the same size as the laser spot. Third, measurement errors caused by deviations can be reduced, and misreading caused by inconsistencies in distance or angle can be avoided.

[0044] In some embodiments, the laser transceiver mainly includes a transmitting end 131 and a receiving end 132. The transmitting end 131 emits ranging laser, and the receiving end 132 receives reflected laser reflected by the measured object.

[0045] Please continue to refer to Figures 1 to 5 In some embodiments, the infrared lens assembly 10 includes a mounting assembly 14. The mounting assembly 14 is arranged in the lens barrel cavity. The mounting assembly 14 can be detachably or fixedly connected in the lens barrel cavity. In the present embodiment, the mounting assembly 14 can be welded in the lens barrel cavity. The mounting assembly 14 supports the laser ranging assembly 13 in the lens barrel cavity, so that the laser ranging assembly 13 is located adjacent to the second mirror surface 121b and close to the laser emission and receiving area. The mounting assembly 14 can be of any structure, which is not limited herein.

[0046] The mounting assembly 14 can improve the stability of the laser ranging assembly 13 hovering in the lens barrel cavity and close to the second mirror surface 121b, and further improve the accuracy of the measurement of the laser ranging assembly 13.

[0047] In an embodiment, the mounting assembly 14 includes at least two mounting brackets 141. The at least two mounting brackets 141 are circumferentially distributed on the inner side wall of the lens barrel. The mounting brackets 141 are detachably or fixedly connected to the inner side wall of the lens barrel at one end. The other end of the mounting brackets 141 is connected to the outer periphery of the laser ranging assembly 13. The other end of the mounting brackets 141 is detachably or fixedly connected to the laser ranging assembly 13.

[0048] The at least two mounting brackets 141 can improve the stability of the laser ranging assembly 13 hovering in the lens barrel cavity and close to the second mirror surface 121b, reduce the risk of shaking of the laser ranging assembly 13, and further improve the accuracy of the measurement of the laser ranging assembly 13.

[0049] The number of the mounting brackets 141 can be, but is not limited to, two, three, four or more. When the number of the mounting brackets 141 is two, the included angle between the two mounting brackets 141 is 180°, i.e., the two mounting brackets 141 are arranged in a straight line. When the number of the mounting brackets 141 is three, the included angle between the two adjacent mounting brackets 141 among the three mounting brackets 141 is 120°. When the number of the mounting brackets 141 is four, the included angle between the two adjacent mounting brackets 141 among the four mounting brackets 141 is 90°. When the number of the mounting brackets 141 is more than two, the included angle between the two mounting brackets 141 can be other values, which are not limited herein.

[0050] In an embodiment, the mounting assembly 14 includes four mounting brackets 141. The four mounting brackets 141 are circumferentially and equiangularly distributed on the inner side wall of the lens barrel. The four mounting brackets 141 suspend the laser ranging assembly 13 right behind the second mirror surface 121b of the first infrared lens 121. The mounting brackets 141 can be, but are not limited to, metal rods.

[0051] In some embodiments, the optical lens assembly 12 includes at least a second infrared lens 122 and a third infrared lens 123. The second infrared lens 122 and the third infrared lens 123 can both pass infrared light. The second infrared lens 122 and the third infrared lens 123 are both mounted in the lens barrel cavity. The second infrared lens 122 and the third infrared lens 123 are detachably or fixedly connected to the lens barrel cavity. The second infrared lens 122 is located between the first infrared lens 121 and the third infrared lens 123. From the center of the view window to the center line of the lens barrel cavity, the first infrared lens 121, the second infrared lens 122, and the third infrared lens 123 are sequentially arranged in the lens barrel cavity.

[0052] By the optical lens assembly 12 comprising at least the first infrared lens 121, the second infrared lens 122 and the third infrared lens 123, the infrared light can be converged to the focal plane of the infrared detector 20. The second infrared lens 122 and the third infrared lens 123 can be chalcogenide glass.

[0053] Specifically, the interval between the first infrared lens 121 and the second infrared lens 122 is greater than the interval between the second infrared lens 122 and the third infrared lens 123 to meet the imaging requirements. It should be noted that the interval between the first infrared lens 121 and the second infrared lens 122 and the interval between the second infrared lens 122 and the third infrared lens 123 can be set according to actual imaging requirements, which are not limited herein. The second infrared lens 122 and the third infrared lens 123 can be convex lenses.

[0054] Please continue to refer to Figures 1 to 5 The present application provides an infrared thermal imager. The infrared thermal imager (not shown in the figure) comprises at least an infrared lens assembly 10 and an infrared detector 20. The infrared detector 20 is arranged in the lens barrel cavity. The infrared detector 20 is detachably connected in the lens barrel cavity. The detachable mode can be but is not limited to clamping, plug-in and bolt, etc. The infrared detector 20 is used to receive the infrared light of the optical lens assembly 12, that is, the infrared detector 20 is responsible for receiving and processing thermal information. It should be noted that the infrared lens assembly 10 in the present embodiment is the infrared lens assembly 10 described in the above embodiment, which will not be described herein.

[0055] The infrared thermal imager hides the laser ranging assembly 13 completely behind the first infrared lens 121 through the infrared lens assembly 10, that is, the first infrared lens 121 does not need to be broken, which not only ensures the effective clear aperture, and further ensures the total energy that the infrared detector 20 can accept, thereby ensuring the imaging quality such as illumination, resolution, etc.; but also ensures the sealing performance without the need to set a relatively complex sealing structure, that is, the sealing performance of the infrared lens assembly 10 is better, and the water-tight and air-tight effect is better; at the same time, the optical axis of the laser ranging assembly 13 and the optical axis of the optical lens assembly 12 are closer, which can realize accurate ranging of small-size objects.

[0056] In some embodiments, the infrared thermal imager can further comprise a processing assembly (not shown in the figure). The processing assembly can be connected with the infrared detector 20 and the laser ranging assembly 13 respectively, so that the thermal imaging information of the infrared detector 20 and the distance information of the laser ranging assembly 13 are transmitted to the processing assembly.

[0057] The terms "first", "second", "third", etc. in the present application are only used for descriptive purpose and cannot be construed as indicating or implying a quantity of technical features indicated. Thus, the features defined with "first", "second", "third" can include at least one of the features explicitly or implicitly. All directional indications (such as upper, lower, left, right, front, back, etc.) in the present application are only used for explaining the relative position relationship, movement condition, etc. between components, and if the specific posture (as shown in the drawings) changes, the directional indications also change accordingly. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to the process, method, product or device.

[0058] The above description is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An infrared lens assembly, characterized by, At least comprising: a lens barrel, provided with a lens barrel cavity and a view window communicating with the lens barrel cavity; an optical lens assembly arranged in the lens barrel cavity, the optical lens assembly at least comprising a first infrared lens, the first infrared lens being mounted at the view window, the first infrared lens being provided with a laser emission receiving area; a laser ranging assembly arranged in the lens barrel cavity and adjacent to one side of the first infrared lens facing the lens barrel cavity, the emission end and the receiving end of the laser ranging assembly corresponding to the laser emission receiving area for emission and reception of the laser ranging assembly.

2. The infrared lens assembly of claim 1, wherein, The first infrared lens comprises a first mirror surface and a second mirror surface arranged oppositely, the second mirror surface facing the lens barrel cavity, the laser emission receiving area comprises a first laser emission receiving area, the first laser emission receiving area comprises a first laser emission receiving surface and a second laser emission receiving surface arranged in parallel with the first laser emission receiving surface, the first laser emission receiving surface is arranged on the first mirror surface in a planar manner, and the second laser emission receiving surface is arranged on the second mirror surface in a planar manner.

3. The infrared lens assembly of claim 1, wherein, The first infrared lens comprises a first mirror surface and a second mirror surface arranged oppositely, the second mirror surface facing the lens barrel cavity, the laser emission receiving area comprises a second laser emission receiving area, the second laser emission receiving area comprises a third laser emission receiving surface and a fourth laser emission receiving surface arranged oppositely, the third laser emission receiving surface is convex on the first mirror surface, and the fourth laser emission receiving surface is concave on the second mirror surface.

4. The infrared lens assembly of claim 3, wherein, The laser ranging assembly comprises a laser transceiver, and the laser transceiver corresponds to the fourth laser emission receiving surface.

5. The infrared lens assembly of claim 2 or 3, wherein, The first mirror surface is coated with a first anti-reflection film, and the second mirror surface is coated with a second anti-reflection film, the first anti-reflection film and the second anti-reflection film are used for the required wave band and infrared wave band of the laser ranging assembly.

6. The infrared lens assembly of any of claims 1 to 3, wherein, The laser emission receiving area is located in the central region of the first infrared lens, and the laser ranging assembly is adjacent to the central position of one side of the first infrared lens facing the lens barrel cavity.

7. The infrared lens assembly of claim 6, wherein, The receiving optical axis of the optical lens assembly is coaxial with the emission optical axis of the laser ranging assembly.

8. The infrared lens assembly of any of claims 1 to 3, wherein, The infrared lens assembly comprises at least two mounting brackets, one end of the at least two mounting brackets is arranged circumferentially on the inner side wall of the lens barrel, and the other end is connected to the outer periphery of the laser ranging assembly.

9. The infrared lens assembly of any of claims 1 to 3, wherein, The optical lens assembly at least comprises a second infrared lens and a third infrared lens, the second infrared lens and the third infrared lens are both mounted in the lens barrel cavity, and the second infrared lens is located between the first infrared lens and the third infrared lens.

10. An infrared thermal imager characterized by, At least comprising: the infrared lens assembly of any one of claims 1 to 9; an infrared detector arranged in the lens barrel cavity and receiving infrared light of the optical lens assembly.

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