Electronic equipment and monitoring system

Abstract

The invention relates to the technical field of image acquisition equipment, and discloses electronic equipment and a monitoring system. The electronic equipment comprises a first cold end arranged on the electronic equipment, the first cold end is arranged on a shell of the electronic equipment and communicates with a containing cavity in the shell, and the containing cavity can contain a heating part; the shell is further provided with a second cold end corresponding to the first cold end, the thermal conductivity of the second cold end is lower than that of the first cold end, and the specific heat capacity of the second cold end is higher than that of the first cold end, so that when the temperature change in the shell reaches a threshold value, water vapor in the shell is condensed at the second cold end, and the influence of the water vapor on the first cold end is reduced. The thermal conductivity of the second cold end is lower than that of the first cold end, and the specific heat capacity of the second cold end is higher than that of the first cold end, so that when the water vapor in the accommodating cavity reaches a saturated state, the water vapor preferentially generates a fogging phenomenon at the second cold end. Therefore, the electronic equipment can solve the problem of fogging of the window glass of the camera in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of image acquisition equipment, and in particular to an electronic device and a monitoring system. Background Art

[0002] With the rapid development of the security field, surveillance cameras are being used more and more widely. However, as a product for outdoor applications, camera windows often condense fog, affecting the normal monitoring of the camera. The main reason for fogging is that after the camera is stored in a high humidity environment for a long time, some structural parts or single boards inside the camera housing will have a high water content. At this time, when the device is powered on, as the temperature rises, and the device housing has a certain sealing level, the moisture contained in the structural parts and single boards is baked out, and the water vapor in the air inside the housing gradually reaches a saturated state. At this time, the window glass is the lowest point of the housing temperature. The saturated water vapor in the chamber will condense on the inside of the window glass, causing the window glass to fog. The fogging of the camera window will affect video capture and collection, resulting in a foggy image; it will also bring greater safety hazards. Therefore, how to prevent the camera window glass from fogging is an urgent problem to be solved in the industry. Summary of the invention

[0003] The invention provides an electronic device and a monitoring system, which are used to solve the defect of fogging of the window of a camera in the prior art.

[0004] The present invention provides an electronic device, the electronic device comprising a first cold end arranged at the electronic device,

[0005] The first cold end is disposed in a housing of the electronic device and communicates with a receiving cavity inside the housing, wherein the receiving cavity can receive a heat generating component; and

[0006] The shell is also provided with a second cold end corresponding to the first cold end, the thermal conductivity of the second cold end is lower than the thermal conductivity of the first cold end, and the specific heat capacity of the second cold end is higher than the specific heat capacity of the first cold end, so that when the temperature change in the shell reaches a threshold value, water vapor in the shell condenses at the second cold end, reducing the influence of the water vapor on the first cold end.

[0007] According to the electronic device provided by the present invention, the housing comprises:

[0008] The housing body is provided with the accommodating cavity, and the housing body is provided with the first opening and the second opening; the first cold end is installed in the first opening, and the second cold end is installed in the second opening.

[0009] According to the electronic device provided by the present invention, a first distance between the second cold end and the heat-generating component is not less than a second distance between the first cold end and the heat-generating component.

[0010] According to the electronic device provided by the present invention, along the axial direction of the shell, the second cold end and the first cold end are respectively arranged at two ends of the shell in a one-to-one correspondence.

[0011] According to the electronic device provided by the present invention, the material of the second cold end is selected from thermal insulation materials.

[0012] According to the electronic device provided by the present invention, the thermal insulation material includes at least one of polystyrene, acrylonitrile-butadiene-styrene copolymer, polycarbonate, polymethyl methacrylate or polypropylene, or a combination of several thereof.

[0013] According to the electronic device provided by the present invention, the convection heat transfer coefficient of the second cold end is higher than the convection heat transfer coefficient of the second cold end.

[0014] According to the electronic device provided by the present invention, the electronic device includes a camera, a camcorder, a still camera or a video recorder, and the first cold end includes a window glass.

[0015] According to the electronic device provided by the present invention, the second cold end includes a memory card cover and / or a speaker cover.

[0016] The present invention also provides a monitoring system, comprising a terminal and any of the electronic devices described above; the electronic device is electrically connected to the terminal.

[0017] The present invention provides an electronic device and monitoring system. By arranging a second cold end corresponding to the first cold end on the shell, the thermal conductivity of the second cold end is lower than that of the first cold end, and the specific heat capacity of the second cold end is higher than that of the first cold end, so once the heat generating component generates heat, the temperature in the accommodating cavity gradually increases, the temperature of the second cold end is lower than that of the first cold end, and the temperature change rate of the second cold end is also lower than that of the first cold end. At the same time, the water vapor in the shell gradually reaches a saturated state as the temperature rises. Once the water vapor in the accommodating cavity reaches a saturated state, and the temperature of the second cold end is lower than the condensation point of the water vapor in this state, the water vapor will preferentially condense at the second cold end to produce fogging, thereby reducing the influence of the water vapor on the first cold end, and solving the problem of fogging of the window glass of the camera in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the electronic device provided by the present invention;

[0020] Figure 2 This is one of the schematic diagrams of the assembly structure of the electronic device and the heat generating component provided by the present invention;

[0021] Figure 3 This is the second schematic diagram of the assembly structure of the electronic device and the heat generating component provided by the present invention;

[0022] Figure 4 It is a curve of the temperature change of the window assembly and the anti-fog component provided by the present invention over time.

[0023] Reference numerals:

[0024] 100, shell; 101, accommodating chamber; 110, shell body; 120, second cold end;

[0025] 200, heating component; 210, control component; 220, camera;

[0026] 300. First cold end. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0029] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0030] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0032] At present, there are generally the following methods for defogging and anti-fogging of camera fogging: the first method is to add hygroscopic materials, such as desiccants, in the camera to reduce the humidity in the camera cavity, thereby achieving the purpose of defogging and anti-fogging. The second method is to add a cooling fan in the camera and use the cooling fan to blow the airflow to the lens glass to achieve defogging. The third method is to heat the entire window glass by sticking a heating film on the outer ring of the lens glass to achieve the purpose of anti-fogging. The fourth method is to use the fill light board or heating resistor to generate heat and achieve the purpose of defogging the window glass through heat conduction. These solutions have different disadvantages. For example, desiccant has a service life and there is a risk of failure. Active defogging solutions such as fans and heating films will increase the cost of the camera. The fill light board and heating resistor will increase the operating power consumption of the camera, and the long-term high-temperature operation of the light board will affect the life of the lamp beads. Therefore, how to prevent the camera window glass from fogging has always been an urgent problem to be solved in the industry.

[0033] In order to solve the problem of fogging of camera window glass in the prior art, the present invention provides an electronic device. Figures 1 to 4 The electronic device of the present invention is described in detail. Figure 1 It is a three-dimensional structural schematic diagram of the electronic device provided by the present invention;

[0034] Figure 2 This is one of the schematic diagrams of the assembly structure of the electronic device and the heat generating component provided by the present invention; Figure 3 This is the second schematic diagram of the assembly structure of the electronic device and the heat generating component provided by the present invention; Figure 4 It is a curve of the temperature change of the window assembly and the anti-fog component provided by the present invention over time.

[0035] like Figure 1 , Figure 2 and Figure 3 As shown, in a specific embodiment of the present invention, an electronic device is provided. The electronic device comprises a first cold end 300 provided in the electronic device, the first cold end 300 is provided in the housing 100 of the electronic device, and is communicated with a receiving cavity 101 inside the housing 100, and the receiving cavity 101 can receive a heat generating component; and a second cold end 120 corresponding to the first cold end 300 is also provided on the housing 100, the thermal conductivity of the second cold end 120 is lower than the thermal conductivity of the first cold end 300, and the specific heat capacity of the second cold end 120 is higher than the specific heat capacity of the first cold end 300, so that when the temperature change in the housing 100 reaches a threshold value, the water vapor in the housing 100 condenses at the second cold end 120, reducing the influence of the water vapor on the first cold end 300.

[0036] In a specific embodiment of the present invention, a second cold end 120 corresponding to the first cold end 300 is provided on the shell 100, and the thermal conductivity of the second cold end 120 is lower than that of the first cold end 300, and the specific heat capacity of the second cold end 120 is higher than that of the first cold end 300. Therefore, once the heat-generating component 200 generates heat, the temperature in the accommodating cavity 101 gradually increases, the temperature of the second cold end 120 is lower than the temperature of the first cold end 300, and the temperature change rate of the second cold end 120 is also lower than the temperature change rate of the first cold end 300. At the same time, the water vapor in the shell 100 gradually reaches a saturated state as the temperature rises. Once the water vapor in the accommodating cavity 101 reaches a saturated state, and the temperature of the second cold end 120 is lower than the condensation point of the water vapor in this state, the water vapor will preferentially condense at the second cold end 120 to produce fogging, thereby reducing the influence of the water vapor on the first cold end 300, thereby solving the problem of fogging of the window glass of the camera in the prior art.

[0037] In addition, the present invention mainly utilizes the heat generation and thermal conductivity characteristics of the electronic device itself to achieve the purpose of anti-fogging of the first cold end 300. Compared with the technical means of setting a fan or a heating film in the prior art, the electronic device of the present invention reduces the design and operation power consumption of the electronic device and improves the reliability of the device; and under the condition of not occupying the limited volume of the cavity of the device, the anti-fogging function can be achieved for a long time. Compared with the desiccant defogging solution, the storage life of the device can be greatly improved, and the failure risk of the defogging solution can be minimized.

[0038] The electronic device of the present invention optimizes the design of the housing 100 from the perspective of the fogging principle, so that the temperature change rate of the second cold end 120 and the temperature of the second cold end 120 when the heating component is in stable operation are lower than the first cold end 300. The saturated water vapor in the accommodating cavity 101 condenses preferentially at the lowest temperature point. It can be seen from the heat balance equation and the heat transfer equation that the temperature change rate of materials with low thermal conductivity and high specific heat capacity is lower when the heat flux density is the same. The thinner second cold end 120 will make it reach equilibrium with the ambient temperature faster, making its temperature lower than the first cold end 300, and then preferentially condense at this point, thereby achieving the purpose of anti-fogging.

[0039] It should be noted that the first cold end 300 corresponds to the second cold end 120, which can be understood as the first cold end 300 and the second cold end 120 are respectively arranged at the two ends of the shell 100 in a one-to-one correspondence along the axial direction of the shell 100. It can also be understood that a first angle is formed between the center of the first cold end 300 and the center line of the axis of the shell 100 and the axis of the shell 100, and a second angle is formed between the center of the second cold end 120 and the center line of the axis of the shell 100 and the axis of the shell 100. In the above, at least one of the first angle and the second angle is not a straight angle.

[0040] It can be understood that the axis of the shell 100 can be the central axis of the shell 100 in the length direction, or the central axis of the shell 100 in the width direction, but is not limited to the above two central axes.

[0041] In some embodiments, the thermal conductivity of the housing 100 is lower than that of the first cold end 300, and the specific heat capacity is higher than that of the first cold end 300. Once the water vapor in the accommodating cavity 101 reaches a saturated state as the temperature rises, it is preferentially misted on the housing 100, reducing the impact on the first cold end 300.

[0042] In some other embodiments, the housing 100 includes a shell body 110; the accommodating cavity 101 is disposed in the shell body 110, and the shell body 110 is provided with a first opening and a second opening communicating with the accommodating cavity 101; the first cold end 300 is installed in the first opening, and the second cold end 120 is installed in the second opening. The heat generating component starts to generate heat in the accommodating cavity 101, and the water vapor in the accommodating cavity 101 gradually reaches a saturated state as the temperature rises. Because the thermal conductivity of the second cold end 120 is lower than that of the first cold end 300, and the specific heat capacity of the second cold end 120 is higher than that of the first cold end 300, the temperature of the second cold end 120 is lower than that of the first cold end 300. Once the water vapor reaches a saturated state and the temperature of the second cold end 120 is lower than the dew point of the water vapor in this state, the water vapor will fog on the second cold end 120, reducing the influence of the water vapor on the first cold end 300.

[0043] In some embodiments, the material of the housing body 110 may be the same as that of the second cold end 120. In other embodiments, the material of the housing body 110 may be different from that of the second cold end 120.

[0044] In a specific embodiment of the present invention, the material of the housing body 110 is selected from metal or plastic.

[0045] In some embodiments, the metal includes, but is not limited to, aluminum alloy or magnesium alloy. The metal housing body 110 is suitable for outdoor use, has good waterproof performance, good heat dissipation performance, and long service life. The housing body 110 is usually made of magnesium alloy or aluminum alloy die-casting.

[0046] In some embodiments, the plastic includes, but is not limited to, at least one of polystyrene, acrylonitrile-butadiene-styrene copolymer, polycarbonate, polymethyl methacrylate, or polypropylene, or a combination thereof. The overall weight of the plastic housing body 110 is lighter than that of the metal housing body 110 .

[0047] In some embodiments, the second cold end 120 can be located at any position of the housing body 110 , and the fixing method includes, but is not limited to, gluing or screw locking.

[0048] It should be noted that it is necessary to ensure that the second cold end 120 can directly exchange heat with the receiving chamber 101 and the external environment. Compared with the first cold end 300, the lower thermal conductivity and higher specific heat capacity of the second cold end 120 can make this position have a lower temperature change rate; so that the saturated water vapor condenses there first; and because the water content inside the receiving chamber 101 is limited, once the water vapor condenses at this position, within the operating temperature range of the equipment, the water vapor cannot meet the state requirements of condensation from other positions, thereby solving the problem of window fogging.

[0049] In a specific embodiment of the present invention, the first distance between the second cold end 120 and the heat-generating component is not less than the second distance between the first cold end 300 and the heat-generating component, in order to further ensure that the saturated water vapor condenses and mists preferentially at the second cold end 120, thereby reducing the impact on the first cold end 300.

[0050] In a specific embodiment of the present invention, along the axial direction of the housing 100, the second cold end 120 and the first cold end 300 are respectively arranged at two ends of the housing 100 in a one-to-one correspondence. The distance between the second cold end 120 and the first cold end 300 is made relatively far to avoid the second cold end 120 from affecting the first cold end 300 when fogging.

[0051] In a specific embodiment of the present invention, the heat-generating component 200 is arranged along the axial direction of the housing 100 , and a first distance between the second cold end 120 and the heat-generating component 200 is equal to a second distance between the first cold end 300 and the heat-generating component 200 .

[0052] In a specific embodiment of the present invention, the thickness of the second cold end 120 is not greater than the thickness of the first cold end 300. The thinner second cold end 120 will allow it to reach equilibrium with the ambient temperature faster, making its temperature lower than that of the first cold end 300, and condensation will occur preferentially at this point, thereby achieving the purpose of preventing fogging.

[0053] In a specific embodiment of the present invention, the material of the second cold end 120 is a heat-insulating material. The heat-insulating material generally has a lower thermal conductivity and a higher specific heat capacity, and can achieve the purpose of anti-fogging.

[0054] In some embodiments, the insulation material includes at least one of polystyrene, acrylonitrile-butadiene-styrene copolymer, polycarbonate, polymethyl methacrylate or polypropylene, or a combination of several thereof.

[0055] In some embodiments, the thermal conductivity of polystyrene is 0.16 W / (m·K) and the specific heat capacity is 1225-1464 J / (Kg·K).

[0056] In some embodiments, acrylonitrile-butadiene-styrene copolymer, also known as ABS copolymer, has a thermal conductivity of 0.18 W / (m·K) and a specific heat capacity of 1255-1647 J / (Kg·K).

[0057] In some embodiments, the thermal conductivity of the polycarbonate is 0.21 W / (m·K) and the specific heat capacity is 1172-1255 J / (Kg·K).

[0058] In some embodiments, the thermal conductivity of polymethyl methacrylate is 0.18 W / (m·K) and the specific heat capacity is 1464 J / (Kg·K).

[0059] In some embodiments, the thermal conductivity of polypropylene is 0.22 W / (m·K) and the specific heat capacity is 1883 J / (Kg·K).

[0060] In a specific embodiment of the present invention, the convective heat transfer coefficient of the second cold end 120 is higher than that of the first cold end 300. Therefore, the second cold end 120 has a good performance in heat exchange with the environment while having a thermal insulation performance, and can play a role in heat dissipation of the accommodating cavity 101. This can extend the time it takes for the water vapor in the accommodating cavity 101 to reach a saturated state, or even prevent the water vapor from reaching a saturated state, thereby further reducing the impact on the first cold end 300.

[0061] In a specific embodiment of the present invention, the electronic device includes a camera, a video camera, a still camera or a video recorder, and the first cold end 300 includes a window glass. By providing the second cold end 120 corresponding to the window glass, the problem of fogging of the window glass is solved.

[0062] In some embodiments, the heating component 200 includes a camera 220, and a control component 210 electrically connected to the camera 220; the control component 210 and the camera 220 are both disposed in the accommodating cavity 101. Once the camera 220 and the control component 210 are powered on, the camera 220 and the control component 210 will generate heat, thereby heating the accommodating cavity 101, so that the water vapor in the accommodating cavity 101 gradually reaches a saturated state. Once the water vapor reaches a saturated state, and the temperature of the second cold end 120 is lower than the temperature of the window glass, and lower than the condensation point of the water vapor in this state, the water vapor will fog at the second cold end 120, but will not fog on the window glass, thereby solving the problem of fogging of the window glass of the camera in the prior art.

[0063] In some embodiments, the control assembly 210 includes a control circuit board.

[0064] In some embodiments, the thermal conductivity of the window glass is 0.7-1.4 W / (m·K), and the specific heat capacity is 400-900 J / (kg·K).

[0065] In order to verify the anti-fogging effect of the electronic device provided by the present invention, the following electronic device is used as an example for simulation verification. Figure 3As shown, the electronic device includes a shell body 110 made of die-cast aluminum, a polystyrene board and a window glass; a first opening and a second opening are axially provided inside the shell body 110; the window glass is installed in the first opening, and the polystyrene board is installed in the second opening; a heating component is installed in the accommodating cavity 101 along the axial direction of the shell body 110, the thickness of the window glass is equal to the thickness of the polystyrene board, the surface area of ​​the window glass is equal to the surface area of ​​the polystyrene board, and the first distance between the polystyrene board and the heating component is equal to the second distance between the window glass and the heating component, so as to ensure that the polystyrene board and the window glass are heated in the same manner. The specific simulation process is as follows: Under a normal temperature of 20°C, a certain power consumption value is assigned to the heating component to simulate the situation where the heating component starts to generate heat at normal temperature. Through transient simulation, the center point temperatures of the polystyrene board and the inner surface of the window glass are recorded respectively, and the results are as follows: Figure 4 It can be determined that when the water vapor in the receiving cavity 101 reaches saturation, condensation occurs first on the polystyrene board.

[0066] like Figure 4 As shown, when the two materials of the same size are heated in the same manner, the temperature change rate of the polystyrene plate is significantly lower than that of the window glass. As the air temperature in the accommodating cavity 101 gradually increases, once the water vapor reaches a saturated state, it will preferentially condense at the lowest temperature point, thereby achieving the purpose of anti-fogging the window.

[0067] The second aspect of the specific embodiment of the present invention provides a monitoring system. The monitoring device includes a terminal and any electronic device in the above embodiments; the electronic device is electrically connected to the terminal, and the electronic device has a certain sealing performance and meets a certain sealing level. When the terminal controls the heating component to start, the heating component generates heat, so that the temperature in the electronic device receiving chamber 101 increases, and the water vapor in the receiving chamber 101 gradually reaches a saturated state. Because the thermal conductivity of the second cold end 120 of the electronic device is lower than the thermal conductivity of the first cold end 300, and the specific heat capacity is higher than the specific heat capacity of the first cold end 300, when the heating component starts to heat up to increase the air temperature in the receiving chamber 101 of the housing 100, at least the temperature of the second cold end 120 is lower than the temperature of the first cold end 300, and the temperature change rate of the second cold end 120 is also lower than the temperature change rate of the first cold end 300. At this time, once the water vapor in the receiving chamber 101 reaches a saturated state, the water vapor preferentially generates fogging at the second cold end 120, reducing the impact on the first cold end 300.

[0068] In a specific embodiment of the present invention, the heating component 200 includes a control component 210 and a camera 220; the control component 210 is disposed in the accommodating cavity 101; the camera 220 is electrically connected to the control component 210, and the optical path of the camera 220 coincides with the central axis of the window component. The control component 210 receives a control signal sent by the terminal to control the camera 220 to collect images.

[0069] In another embodiment, the electronic device may also be a mirror with light emitting, heating or defogging functions; the first cold end is the mirror surface of the mirror.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electronic device, comprising a first cold end (300) arranged on the electronic device, characterized in that: The first cold end (300) is disposed on a housing (100) of the electronic device and is in communication with a receiving cavity (101) inside the housing (100), wherein the receiving cavity (101) is capable of receiving a heat generating component (200); and The shell (100) is also provided with a second cold end (120) corresponding to the first cold end (300); the thermal conductivity of the second cold end (120) is lower than the thermal conductivity of the first cold end (300), and the specific heat capacity of the second cold end (120) is higher than the specific heat capacity of the first cold end (300), so that when the temperature change in the shell (100) reaches a threshold value, water vapor in the shell (100) condenses at the second cold end (120), thereby reducing the influence of the water vapor on the first cold end (300).

2. The electronic device according to claim 1, characterized in that: The housing (100) comprises: A shell body (110), wherein the accommodating cavity (101) is arranged in the shell body (110), and the shell body (110) is provided with a first opening and a second opening which are connected to the accommodating cavity (101); the first opening is provided with the first cold end (300), and the second opening is provided with the second cold end (120).

3. The electronic device according to claim 1, characterized in that: A first distance between the second cold end (120) and the heat-generating component (200) is not less than a second distance between the first cold end (300) and the heat-generating component (200).

4. The electronic device according to claim 3, characterized in that: Along the axial direction of the shell (100), the second cold end (120) and the first cold end (300) are respectively arranged at two ends of the shell (100) in a one-to-one correspondence.

5. The electronic device according to claim 1, characterized in that: The material of the second cold end (120) is selected from thermal insulation materials.

6. The electronic device according to claim 5, characterized in that: The thermal insulation material includes at least one of polystyrene, acrylonitrile-butadiene-styrene copolymer, polycarbonate, polymethyl methacrylate or polypropylene, or a combination of several of them.

7. The electronic device according to any one of claims 1 to 6, characterized in that: The convection heat transfer coefficient of the second cold end (120) is higher than the convection heat transfer coefficient of the first cold end (300).

8. The electronic device according to claim 7, characterized in that: The electronic device comprises a camera, a camcorder, a still camera or a video recorder, and the first cold end (300) comprises a window glass.

9. The electronic device according to claim 8, characterized in that: The second cold end (120) comprises a memory card cover and / or a speaker cover.

10. A monitoring system, characterized in that: It comprises a terminal and the electronic device according to any one of claims 1 to 9; the electronic device is electrically connected to the terminal.

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