Heat dissipation device and sealed optical lens

Abstract

The invention relates to the technical field of optical measurement, in particular to a heat dissipation device and a sealed optical lens, the heat dissipation device is applied to the sealed optical lens provided with a camera, a connecting support and a lens base, the heat dissipation device comprises a heat conduction assembly and a heat dissipation assembly, and the heat conduction assembly is located in the sealed optical lens and attached to the connecting support and the lens base. The heat conduction assembly is used for conducting heat inside the sealed optical lens to the outside of the sealed optical lens; the heat dissipation assembly is located outside the sealed optical lens and attached to the lens base, and the heat dissipation assembly is used for conducting heat dissipation on the heat conduction assembly. Therefore, heat generated by a camera in the sealed optical lens can be effectively conducted to the external environment, and effective heat dissipation is achieved while the sealing performance of the sealed optical lens is kept.

Description

Technical Field

[0001] The invention relates to the technical field of optical measurement, and in particular provides a heat dissipation device and a sealed optical lens. Background Art

[0002] With the continuous innovation and improvement of modern optical measurement equipment, the resolution and frame rate of the camera equipped with the optical lens inside the equipment are gradually improving. This change inevitably leads to an increase in the heat generation power of the camera, which in turn increases the temperature inside the lens, directly affecting the long-term working performance of the equipment. In addition, optical measurement equipment is usually used in harsh outdoor environments and sometimes faces high ambient temperatures, making the heat dissipation problem of the camera increasingly important.

[0003] Generally speaking, optical lenses require good sealing performance of the entire assembly to prevent the intrusion of external environmental factors such as sand, dust, water vapor and salt spray, which would affect the key performance indicators of the lens. However, the sealing design makes it impossible for the optical lens to form heat convection conditions with the outside world. The heat generated by the camera inside the lens can only be exchanged with the outside world through heat conduction and heat radiation.

[0004] At present, the existing camera heat dissipation device design is mainly focused on the camera module itself. Although the camera module can meet the requirements of long-term operation in a large space at room temperature, when the ambient temperature is high, the internal space of the sealed optical lens is small and there is almost no air flow, which cannot meet the thermal boundary conditions required by the camera module. In addition, optical lenses usually have high precision requirements, so the configured heat dissipation device should not impose rigid constraints on the camera to avoid affecting the accuracy of the optical axis after the optical system is debugged. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a heat dissipation device and a sealed optical lens, which can effectively conduct the heat generated by the camera inside the sealed optical lens to the external environment, thereby achieving effective heat dissipation while maintaining the sealing of the sealed optical lens.

[0006] A heat dissipation device provided in an embodiment of the first aspect of the present invention is applied to a sealed optical lens provided with a camera, a connecting bracket and a lens base, wherein the camera is arranged above the connecting bracket, and the lens base is sleeved on the outside of the camera and the connecting bracket, and the heat dissipation device specifically includes a heat conductive component and a heat dissipation component, the heat conductive component is located inside the sealed optical lens, and is fitted to the connecting bracket and the lens base, and the heat conductive component is used to conduct the heat inside the sealed optical lens to the outside of the sealed optical lens; the heat dissipation component is located outside the sealed optical lens, and is fitted to the lens base, and the heat dissipation component is used to dissipate heat from the heat conductive component.

[0007] Preferably, the thermally conductive assembly includes a first thermally conductive pad, a thermally conductive sheet and a second thermally conductive pad, the first thermally conductive pad is adhered to the bottom of the connecting bracket; the thermally conductive sheet is bonded to the bottom of the first thermally conductive pad, and a plurality of bonding blocks are provided at the bottom of the thermally conductive sheet; the second thermally conductive pad is bonded to the bonding blocks so that the bottom of the second thermally conductive pad is adhered to the bottom of the lens base.

[0008] Preferably, the thermal conductivity of the first thermally conductive pad is greater than 18 W / (m·K); the thermal conductivity of the second thermally conductive pad is greater than 18 W / (m·K).

[0009] Preferably, the first thermal pad and the second thermal pad are thermally conductive silicon pads; the thermally conductive sheet is a thermally conductive copper sheet; wherein the heat dissipation area of ​​the first thermal pad is greater than the heat dissipation area of ​​the second thermally conductive pad.

[0010] Preferably, the heat dissipation assembly includes heat dissipation fins, a fan bracket and a protective fan. A first mounting hole is provided at the bottom of the heat dissipation fins, the first mounting hole is used to connect to the lens base, and the heat dissipation fins are used to exchange heat with the external environment; the fan bracket is connected to the lens base; the protective fan is connected to the fan bracket so that the protective fan is located on one side of the heat dissipation fins.

[0011] Preferably, the air inlet direction of the protective fan is the head of the sealed optical lens; and the air outlet direction of the protective fan is the tail of the sealed optical lens.

[0012] A sealed optical lens provided in an embodiment of the second aspect of the present invention specifically includes a camera, a lens base, a lens assembly, a protective tail cover and a heat dissipation device as provided in the embodiment of the first aspect; the camera is arranged above a connecting bracket; the lens base is sleeved on the outside of the camera and the connecting bracket; a second mounting hole is provided at the rear of the lens assembly, and the second mounting hole is used to connect with the front of the lens base; the protective tail cover is connected to the rear of the lens base, and a sealing groove is provided on the protective tail cover; the heat dissipation device includes a heat conductive component and a heat dissipation component, the heat conductive component is attached to the connecting bracket and the lens base, and the heat dissipation component is attached to the outside of the lens base.

[0013] Compared with the prior art, the present invention can achieve the following beneficial effects: a heat dissipation device is applied to a sealed optical lens provided with a camera, a connecting bracket and a lens base, the camera is arranged above the connecting bracket, the lens base is sleeved on the outside of the camera and the connecting bracket, the heat dissipation device specifically includes a heat conduction component and a heat dissipation component, the heat conduction component is located inside the sealed optical lens, fitted to the connecting bracket and the lens base, the heat conduction component is used to conduct the heat inside the sealed optical lens to the outside of the sealed optical lens; the heat dissipation component is located outside the sealed optical lens, fitted to the lens base, and the heat dissipation component is used to dissipate the heat from the heat conduction component. Thus, the heat generated by the camera inside the sealed optical lens can be effectively conducted to the external environment, and effective heat dissipation can be achieved while maintaining the sealing of the sealed optical lens.

[0014] Among them, the thermal conductive component, silicone grease and heat sink fins are made of thermally conductive materials with high thermal conductivity, which can effectively conduct the heat generated by the camera to the outside of the sealed optical lens, while maintaining the sealing of the sealed optical lens, and achieving effective heat dissipation; the first thermal conductive pad and the second thermal conductive pad are made of elastic thermally conductive materials, which can ensure a good fit between the thermal conductive component and the connecting bracket and the lens base, making the heat transfer process smoother, and the elastic link will not produce rigid constraints on the camera, thereby affecting the accuracy of the optical axis after the optical system is debugged.

[0015] Among them, by setting a protective fan on one side of the heat dissipation fins, the heat dissipation efficiency of the heat dissipation fins to the heat concentrated area can be improved, so that the camera heat can be effectively transferred to the external environment through three methods: thermal radiation, heat conduction, and thermal convection.

[0016] Among them, by configuring a protective fan, changing the surface area of ​​the heat sink fins, changing the surface roughness and surface treatment of the heat sink fins, or replacing the connecting bracket, lens base, thermal conductive component or the material of the heat sink fins, it is possible to reasonably dissipate the heat generated by different cameras, so that the heat sink can match different sealed optical lenses. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural schematic diagram of a heat dissipation device and a sealed optical lens provided according to an embodiment of the present invention; Figure 2 is a schematic diagram of the cross-sectional structure and heat dissipation principle of a heat dissipation device and a sealed optical lens provided according to an embodiment of the present invention; Figure 3 It is a schematic diagram of a heat dissipation device and a heat dissipation principle of a sealed optical lens provided according to an embodiment of the present invention.

[0018] Reference numerals include: 1 thermal conductive component, 11 first thermal conductive pad, 12 thermal conductive sheet, 121 adhesive block, 13 second thermal conductive pad, 2 heat dissipation component, 21 heat dissipation fin, 211 first mounting hole, 22 fan bracket, 23 protective fan, 3 camera, 4 connecting bracket, 5 lens base, 6 lens component, 61 second mounting hole, 7 protective tail cover. DETAILED DESCRIPTION

[0019] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same modules are represented by the same reference numerals. In the case of the same reference numerals, their names and functions are also the same. Therefore, the detailed description thereof will not be repeated.

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation of the present invention.

[0021] Refer to the following Figures 1 to 3 A heat dissipation device and a sealed optical lens are described according to some embodiments of the present invention.

[0022] like Figure 1 As shown, a heat dissipation device provided according to an embodiment of the first aspect of the present invention is applied to a sealed optical lens provided with a camera 3, a connecting bracket 4 and a lens base 5, wherein the camera 3 is arranged above the connecting bracket 4, and the lens base 5 is sleeved on the outside of the camera 3 and the connecting bracket 4, and the heat dissipation device specifically comprises a heat-conducting component 1 and a heat-dissipating component 2, wherein the heat-conducting component 1 is located inside the sealed optical lens and is attached to the connecting bracket 4 and the lens base 5, and the heat-conducting component 1 can apply the heat conduction effect to conduct the heat inside the sealed optical lens to the outside of the sealed optical lens; the heat-dissipating component 2 is located outside the sealed optical lens and is attached to the lens base 5, and the heat-dissipating component 2 is used to dissipate the heat from the heat-conducting component 1. Thus, the heat generated by the camera 3 inside the sealed optical lens can be effectively conducted to the external environment, and effective heat dissipation can be achieved while maintaining the sealing of the sealed optical lens.

[0023] like Figure 1 As shown, the heat-conducting assembly 1 includes a first heat-conducting pad 11, a heat-conducting sheet 12 and a second heat-conducting pad 13. The first heat-conducting pad 11 is tightly attached to the bottom of the connecting bracket 4; the heat-conducting sheet 12 is bonded to the bottom of the first heat-conducting pad 11, and a plurality of bonding blocks 121 are arranged at the bottom of the heat-conducting sheet 12; the second heat-conducting pad 13 is bonded to the bonding blocks 121 so that the bottom of the second heat-conducting pad 13 is attached to the inner side of the bottom surface of the lens base 5.

[0024] Specifically, before installing the thermal conductive component 1 inside the sealed optical lens, firstly adhere the first thermal conductive pad 11 to the top of the thermal conductive sheet 12, adhere the second thermal conductive pad 13 to the bottom of the bonding block 121 at the bottom of the thermal conductive sheet 12, and then install the thermal conductive component 1 as a whole tightly between the connecting bracket 4 and the lens base 5, so as to ensure that the thermal conductive component 1 can transfer the heat generated by the camera 3 to the outside of the sealed optical lens through the heat conduction effect.

[0025] Among them, the first thermal pad 11 and the second thermal pad 13 are made of thermally conductive materials with a certain elasticity, so that when the thermal conductive component 1 is installed on the sealed optical lens, the first thermal pad 11 is subjected to force and slightly deformed, thereby ensuring that the first thermal pad 11 fits well with the bottom of the connecting bracket 4, does not affect the assembly accuracy of the sealed optical lens, and makes the heat transfer process smoother.

[0026] It is understandable that the first thermal pad 11 and the second thermal pad 13 are made of thermally conductive materials with high thermal conductivity, which can effectively conduct the heat generated by the camera 3 to the outside of the sealed optical lens, thereby ensuring that the first thermal pad 11 has a good thermal conduction effect. In some possible embodiments, the thermal conductivity of the first thermal pad 11 is greater than 18W / (m·K); the thermal conductivity of the second thermal pad 13 is greater than 18W / (m·K).

[0027] Preferably, the first thermally conductive pad 11 and the second thermally conductive pad 13 are thermally conductive silicon pads; and the thermally conductive sheet 12 is a thermally conductive copper sheet.

[0028] The thickness and heat dissipation area of ​​the first thermal pad 11 and the second thermal pad 13 are not limited here. If necessary, the thickness of the first thermal pad 11 can be adjusted as needed to ensure that the first thermal pad 11 fits well with the bottom of the connecting bracket 4, thereby ensuring that the first thermal pad 11 has a good heat conduction effect. Preferably, the thickness and heat dissipation area of ​​the first thermal pad 11 are greater than the thickness and heat dissipation area of ​​the second thermal pad 13. The specific number of the second thermal pads 13 is also not limited here. Preferably, four bonding blocks 121 are arranged below the thermal conductive sheet 12, and the four second thermal pads 13 are bonded to the bottom of the bonding blocks 121 respectively.

[0029] like Figure 1 As shown, the heat dissipation assembly 2 includes a heat dissipation fin 21, a fan bracket 22 and a protective fan 23. A first mounting hole 211 is provided at the bottom of the heat dissipation fin 21. The first mounting hole 211 is used to connect with the lens base 5. Preferably, the heat dissipation fin 21 is mounted on the outer side of the bottom surface of the lens base 5 by screws for heat exchange with the external environment. The fan bracket 22 is connected to the lens base 5, and the protective fan 23 is fixedly connected to the fan bracket 22, so that the protective fan 23 is located on a side close to the heat dissipation fin 21, which can improve the heat dissipation efficiency of the heat dissipation fin 21 to the heat concentrated area, so that the heat of the camera 3 can be effectively transferred to the external environment through three ways: heat radiation, heat conduction, and heat convection.

[0030] Specifically, before installing the heat dissipation assembly 2 to the lens base 5, it is necessary to pre-apply silicone grease on the joint surfaces of the heat dissipation fins 21 and the lens base 5 to fill the tiny gap between the heat dissipation fins 21 and the lens base 5. Since silicone grease is a material with a high thermal conductivity, it can further facilitate heat conduction of the heat dissipation assembly 2.

[0031] The heat sink fins 21 are made of a heat-conducting material with a high thermal conductivity coefficient, which can effectively conduct heat; preferably, the heat sink fins 21 are made of copper or aluminum alloy. The heat sink fins 21 adopt a densely arranged multi-fin structure, which can improve the heat exchange efficiency by increasing the area in contact with the outside air. In addition, the surface of the heat sink fins 21 is processed as rough as possible, which can further improve the thermal radiation rate.

[0032] like Figure 1 and Figure 2 As shown, the air inlet direction of the protective fan 23 is the head of the sealed optical lens, and the air outlet direction of the protective fan 23 is the tail of the sealed optical lens, which can enhance the heat convection effect of the protective fan 23. Among them, the head of the sealed optical lens is the side close to the lens assembly 6, and the tail of the sealed optical lens is the side close to the protective tail cover 7.

[0033] Specifically, the flow direction of the heat generated by the camera 3 inside the sealed optical lens is: first, the heat is transferred from the bottom of the camera 3 to the camera 3 bracket through the contact area, and then passes through the first thermal pad 11, the thermal conductive sheet 12 and the second thermal conductive pad 13 in sequence; after the heat conduction process of the heat conductive component 1, the heat is finally transferred and mainly concentrated on the lens base 5 and the heat dissipation fins 21, and then heat is exchanged with the external environment with the assistance of the protective fan 23.

[0034] like Figure 3 As shown, it can be understood that in a sealed optical lens equipped with a heat dissipation device, only a small amount of heat is transferred to the external environment through thermal radiation, and most of the heat can be diffused to the external environment through natural convection and forced convection under the action of the heat dissipation device.

[0035] That is to say, in the area where the protective fan 23 is configured, the cooling wind blown by the protective fan 23 can force the heat to convect to the external environment; while in the area where the protective fan 23 is not configured, a small amount of heat is diffused by natural convection.

[0036] Next, the principle of the heat dissipation capability matching process of the sealed optical lens equipped with the heat dissipation device is described in detail.

[0037] S102: Heat conduction effect. The camera 3 generates heat in the working state, and through the heat conduction effect, the heat is finally transferred to the lens base 5 and the heat dissipation fins 21. The heat transferred by the heat conduction effect can be calculated by the following formula:

[0038] in, Q 1 is the heat transferred by heat conduction effect, unit is W; kis the thermal conductivity of the material between the lens base 5 and the heat sink fins 21, in units of W / (m·K); A 1 is the surface area that produces the heat conduction effect, that is, the effective heat dissipation area between the lens base 5 and the heat dissipation fins 21, in m²; It is the temperature gradient, which represents the change in temperature per unit length, and its unit is K / m.

[0039] S104: Thermal radiation effect. The amount of heat diffused by the thermal radiation effect on the lens base 5 and the heat dissipation fins 21 can be calculated by the following formula:

[0040] in, Q 2 is the heat diffused by thermal radiation effect, in W; ε is the emissivity of the material generating thermal radiation, dimensionless; σ is the Stefan-Boltzmann constant, approximately 5.67×10 −8 W / (m 2 ⋅K 4 ); A 2 is the surface area producing the thermal radiation effect, in m²; T is the absolute temperature in K.

[0041] S106: Thermal convection effect. The camera 3 generates heat when in operation, most of which is transferred to the external environment through natural convection and forced convection. The heat diffused by the thermal convection effect can be calculated by the following formula:

[0042] in, Q 3 is the heat diffused by thermal convection effect, unit is W; h is the convection heat transfer coefficient, which depends on the properties and flow state of the fluid, unit is W / (m²·K); A 3 is the convection surface area that produces thermal convection effect, in m²; T s is the temperature of the solid surface that produces thermal convection effect, in K; T ∞ The temperature of the fluid away from the surface where the thermal convection effect occurs, in K.

[0043] Therefore, according to the above expression, it can be known that the heat dissipation capacity of the heat dissipation device can be changed in the following manner, and reasonable heat dissipation can be performed according to the heat generated by different cameras 3, so that the heat dissipation device can be matched with different sealed optical lenses, thereby expanding the application range of the heat dissipation device.

[0044] (1-1) Configure the protective fan 23. The protective fan 23 essentially converts natural convection into forced convection, thereby increasing the convection heat transfer coefficient. h, improve the heat dissipation capacity of the heat dissipation device.

[0045] (1-2) Changing the surface area of ​​the heat sink fins 21. The surface area of ​​the heat sink fins 21 can affect the radiation surface area. A 2 and convection surface area A 3. Thereby changing the heat dissipation capacity of the heat dissipation device.

[0046] (1-3) Changing the surface roughness and surface treatment of the heat dissipation fins 21. The surface roughness and surface treatment of the heat dissipation fins 21 can affect the emissivity ε of the material.

[0047] (1-4) The thermal conductivity can be changed by replacing any one or more of the materials of the connecting bracket 4, the lens base 5, the first thermal pad 11, the thermal conductive sheet 12, the second thermal pad 13 or the heat dissipation fin 21. k .

[0048] like Figure 1 As shown, a sealed optical lens provided according to an embodiment of the second aspect of the present invention specifically includes a camera 3, a lens base 5, a lens assembly 6, a protective tail cover 7, and a heat dissipation device provided in the embodiment of the first aspect. The camera 3 is arranged above the connecting bracket 4 by screws, and the lens base 5 is sleeved on the outside of the camera 3 and the connecting bracket 4. A second mounting hole 61 is provided at the rear of the lens assembly 6, and the second mounting hole 61 is used to connect with the head of the lens base 5. The protective tail cover 7 is fixedly connected to the rear of the lens base 5 by screws, and a sealing groove is provided on the joint surface between the protective tail cover 7 and the lens base 5, so as to ensure the sealed connection between the protective tail cover 7 and the lens base 5. The heat dissipation device includes a heat conducting component 1 and a heat dissipation component 2, the heat conducting component 1 is arranged to be attached to the connecting bracket 4 and the lens base 5, and the heat dissipation component 2 is arranged to be attached to the outside of the lens base 5.

[0049] Specifically, when assembling the sealed optical lens, it is necessary to evenly apply sealant on the joints between the camera 3, the connecting bracket 4, the lens base 5, and the lens assembly 6, so that the sealed optical lens can form a sealed integrated structure.

[0050] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

[0051] The above specific implementations of the present invention do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A heat dissipation device, applied to a sealed optical lens provided with a camera (3), a connecting bracket (4) and a lens base (5), wherein the camera (3) is arranged above the connecting bracket (4), and the lens base (5) is sleeved on the outside of the camera (3) and the connecting bracket (4), characterized in that: The heat dissipation device comprises: A heat-conducting component (1), the heat-conducting component (1) being located inside the sealed optical lens and being arranged in contact with the connecting bracket (4) and the lens base (5), the heat-conducting component (1) being used for conducting heat inside the sealed optical lens to the outside of the sealed optical lens; A heat dissipation component (2), the heat dissipation component (2) is located outside the sealed optical lens and is arranged in contact with the lens base (5), and the heat dissipation component (2) is used to dissipate heat from the heat-conducting component (1).

2. The heat dissipation device according to claim 1, characterized in that: The heat conducting component (1) comprises: A first thermally conductive pad (11), the first thermally conductive pad (11) being attached to the bottom of the connecting bracket (4); A heat conducting sheet (12), the heat conducting sheet (12) being bonded to the bottom of the first heat conducting pad (11), and a plurality of bonding blocks (121) being arranged at the bottom of the heat conducting sheet (12); A second thermally conductive pad (13), wherein the second thermally conductive pad (13) is bonded to the bonding block (121) so that the bottom of the second thermally conductive pad (13) is attached to the bottom of the lens base (5).

3. The heat dissipation device according to claim 2, characterized in that: The thermal conductivity of the first thermally conductive pad (11) is greater than 18 W / (m·K); The thermal conductivity of the second thermally conductive pad (13) is greater than 18 W / (m·K).

4. The heat dissipation device according to claim 3, characterized in that: The first thermally conductive pad (11) and the second thermally conductive pad (13) are thermally conductive silicon pads; The heat conducting sheet (12) is a heat conducting copper sheet; Wherein, the heat dissipation area of ​​the first thermal conductive pad (11) is greater than the heat dissipation area of ​​the second thermal conductive pad (13).

5. The heat dissipation device according to claim 1, characterized in that: The heat dissipation component (2) comprises: A heat dissipation fin (21), wherein a first mounting hole (211) is provided at the bottom of the heat dissipation fin (21), the first mounting hole (211) being used for connecting with the lens base (5), and the heat dissipation fin (21) being used for heat exchange with the external environment; A fan bracket (22), wherein the fan bracket (22) is connected to the lens base (5); A protective fan (23), wherein the protective fan (23) is connected to the fan bracket (22) so that the protective fan (23) is located on one side of the heat dissipation fins (21).

6. The heat dissipation device according to claim 5, characterized in that: The air inlet direction of the protective fan (23) is the head of the sealed optical lens; The air outlet direction of the protective fan (23) is the rear part of the sealed optical lens.

7. A sealed optical lens, characterized in that: include: Camera (3); Lens base (5); Lens assembly (6); Protective tail cover (7); as well as A heat dissipation device as claimed in any one of claims 1 to 6; the camera (3) is arranged above the connecting bracket (4); the lens base (5) is sleeved on the outside of the camera (3) and the connecting bracket (4); the tail of the lens assembly (6) is provided with a second mounting hole (61), and the second mounting hole (61) is used to connect with the head of the lens base (5); the protective tail cover (7) is connected to the tail of the lens base (5), and a sealing groove is provided on the protective tail cover (7); the heat dissipation device comprises a heat conducting component (1) and a heat dissipation component (2), the heat conducting component (1) is arranged in contact with the connecting bracket (4) and the lens base (5), and the heat dissipation component (2) is arranged in contact with the outside of the lens base (5).

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