CN114157781A - Video camera - Google Patents
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- CN114157781A CN114157781A CN202111358312.6A CN202111358312A CN114157781A CN 114157781 A CN114157781 A CN 114157781A CN 202111358312 A CN202111358312 A CN 202111358312A CN 114157781 A CN114157781 A CN 114157781A
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- shell
- housing
- camera
- inner shell
- heat dissipation
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- 239000002184 metal Substances 0.000 claims abstract description 33
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- 239000004033 plastic Substances 0.000 abstract description 17
- 229920003023 plastic Polymers 0.000 abstract description 17
- 238000004519 manufacturing process Methods 0.000 abstract description 6
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/51—Housings
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/55—Details of cameras or camera bodies; Accessories therefor with provision for heating or cooling, e.g. in aircraft
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/52—Elements optimising image sensor operation, e.g. for electromagnetic interference [EMI] protection or temperature control by heat transfer or cooling elements
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Studio Devices (AREA)
Abstract
The present application provides a camera. The camera comprises a shell assembly, a lens assembly, an electronic device and a heat dissipation metal plate. The shell assembly is formed into a revolving body structure with a central shaft and comprises an outer shell made of plastic and an inner shell made of heat-conducting plastic, the outer shell is wrapped on the outer side of the inner shell, the outer surface of the inner shell is attached to the inner surface of the outer shell, and the inner shell and the outer shell are kept relatively fixed through a connecting structure. The lens component, the electronic device and the heat dissipation metal plate are contained in the shell component, the optical axis of the lens component is consistent with the direction of the central axis, and the heat dissipation metal plate is connected with the electronic device and the inner shell and used for transferring heat generated by the electronic device to the inner shell. The camera has the advantages of low cost, good performance, environment-friendly manufacturing process and the like.
Description
Technical Field
The application relates to the technical field of monitoring, in particular to a camera.
Background
The camera is widely applied to the monitoring field, an electronic device is arranged in the camera, and the performance of the camera is influenced by overhigh temperature rise of the electronic device. In order to meet the heat dissipation requirement, some cameras adopt shells made of metal materials, but the shells made of metal materials are high in cost, poor in corrosion resistance and not environment-friendly in production process.
Disclosure of Invention
The present application provides an improved camera that enables low cost, high performance, and environmentally friendly manufacturing processes.
A camera, comprising:
the outer shell assembly is coated on the outer side of the inner shell, the outer surface of the inner shell is attached to the inner surface of the outer shell, and the inner shell and the outer shell are kept relatively fixed through a connecting structure; and
the lens assembly, the electronic device and the heat dissipation metal plate are contained in the shell assembly, the optical axis of the lens assembly is consistent with the direction of the central axis, and the heat dissipation metal plate is connected with the electronic device and the inner shell and used for transferring heat generated by the electronic device to the inner shell.
Optionally, the connecting structure includes a groove and a protrusion with matched shapes, one of the inner shell and the outer shell is provided with the groove, the other is provided with the protrusion, and the protrusion is arranged in the groove.
Optionally, the outer shell include with the inner laminating face that the inner shell was laminated mutually, the inner shell include with the outer laminating face that the outer shell was laminated mutually, inner laminating face with outer laminating face centers on the center pin extends, connection structure is equipped with the multiunit, and centers on the center pin set up at interval in outer laminating face with inner laminating face.
Optionally, the outer surface of the inner shell includes an outer cylindrical surface and an outer conical surface extending around the central axis, the inner surface of the outer shell includes an inner cylindrical surface and an inner conical surface extending around the central axis, one of the groove and the protrusion is disposed at a junction of the inner cylindrical surface and the inner conical surface, and the other is disposed at a junction of the outer cylindrical surface and the outer conical surface.
Optionally, the groove is a U-shaped groove, the protrusion is a U-shaped protrusion, and an opening of the U-shaped groove faces the front end of the lens assembly.
Optionally, the heat dissipation panel beating include the base plate and connect in the end plate of the tip of base plate, the end plate for the base plate is buckled, the base plate with the electron device joint, the end plate with the inner shell joint, the shape of end plate with the shape of inner shell is coincide.
Optionally, the camera further includes a thermal pad, the end plate is coupled to the inner shell through the thermal pad, the inner shell includes a heat dissipation surface located on one side, the heat dissipation surface is a sum of an area of a heat transfer surface where the inner shell contacts the thermal pad and an area of a heat diffusion surface located on the periphery of the heat transfer surface, and an area a of the heat dissipation surfacepAccording to RaDetermining;
Ra＝Rc+Rsp+Rh
Rc＝D/(k*Ap)
Rh＝1/(hAp)
wherein R isaIs the total thermal resistance; rcIs normal phase heat conduction thermal resistance; rspIs diffusion thermal resistance; rhIs convective resistance;
Asthe area of the single-side joint of the heat dissipation metal plate and the inner shell is the area of the single-side joint of the heat dissipation metal plate and the inner shell; k is the thermal conductivity of the inner shell; d is the thickness of the inner shell; h is the convective heat transfer coefficient.
Optionally, the dimension W of the inner shell along the central axis direction is determined according to the following formula:
wherein h is the convective heat transfer coefficient; g is the acceleration of gravity; alpha is alphaVIs the coefficient of bulk expansion; v is the dynamic viscosity coefficient; delta t is the excess temperature; α is thermal diffusivity.
Optionally, the outer shell includes a fixing column, the inner shell includes a reinforcing surrounding wall, and the reinforcing surrounding wall covers or partially covers the outer side of the fixing column; and/or
The shell with the shell passes through double-shot moulding integrated into one piece.
Optionally, the outer shell includes a first outer shell and a second outer shell, which are separately disposed, the lens assembly and the electronic device are disposed in the first outer shell, the inner shell is attached to an inner surface of the first outer shell, and the second outer shell is a single-layer outer shell.
Optionally, the first outer shell is in sealing engagement with the second outer shell, the first outer shell includes a joint surface in sealing engagement with the second outer shell, and a height difference is provided between one end of the inner shell close to the second outer shell and the joint surface, so as to form a gap for accommodating a sealing ring for sealing the first outer shell and the second outer shell.
The technical scheme provided by the application can at least achieve the following beneficial effects:
the application provides a camera, adopts the shell subassembly of plastics material, and wherein the shell subassembly has adopted the outer shell of plastics material and the combination scheme of the inner shell of heat conduction plastics material. The material of shell can satisfy intensity, waterproof and anti-riot demand, and the material of inner shell satisfies the heat dissipation demand, has realized with low costs, the performance is good, manufacturing process environmental protection. Meanwhile, the inner shell and the outer shell are kept relatively fixed through the connecting structure, and the risk that the inner shell and the outer shell fall off is reduced or even avoided.
Drawings
FIG. 1 is a schematic view of a camera shown in an exemplary embodiment of the present application;
FIG. 2 is a cross-sectional view of the camera shown in FIG. 1;
FIG. 3 is a schematic view of an inner shell of an outer shell assembly;
FIG. 4 is a schematic view of a housing of the housing assembly;
FIG. 5 is a cross-sectional view of the inner shell engaged with the outer shell;
fig. 6 is an orthographic view of the inner housing directed from the front end to the rear end of the lens assembly in the direction of the central axis;
fig. 7 is an orthographic view of the housing directed from the rear end of the lens assembly to the rear end along the central axis direction;
FIG. 8 is a schematic view of an outer surface of the inner shell;
FIG. 9 is a cross-sectional view of the housing;
FIG. 10 is a schematic view of the bonding of a heat-dissipating metal plate to a thermal pad;
FIG. 11 is a schematic view of a heat dissipating surface on a single side of the inner shell;
FIG. 12 is a graph of the total thermal resistance Ra fitted to the single-sided bonding area Ap of the inner shell and the thermally conductive pad;
FIG. 13 is a cross-sectional view of the inner shell engaged with the outer shell;
FIG. 14 is a top view of the inner shell engaged with the outer shell;
fig. 15 is yet another cross-sectional view of the inner shell engaged with the outer shell.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with aspects of the present application.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. As used in this application, the terms "first," "second," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Similarly, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one, and if only "a" or "an" is denoted individually. "plurality" or "a number" means two or more. Unless otherwise specified, "front", "back", "lower" and/or "upper", "top", "bottom", and the like are for ease of description only and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic diagram of a camera 100 according to an embodiment of the present disclosure. Fig. 2 is a sectional view of the video camera 100 shown in fig. 1.
The present application provides a camera 100, the camera 100 including but not limited to a dome camera, a gun camera. The present application will be described in detail with a hemispherical camera as an example.
The camera 100 includes a housing assembly 10, a lens assembly 20, an electronic device 30, and a heat dissipating sheet metal 40. The housing assembly 10 includes an accommodating cavity 101, the lens assembly 20, the electronic device 30 and the heat dissipation metal plate 40 are all accommodated in the accommodating cavity 101, and the accommodating cavity 101 is a sealed cavity to realize dust prevention and water prevention. The housing assembly 10 is provided with a window 102 facing the lens assembly 20 for light to enter. The housing assembly 10 is formed in a solid structure having a central axis a, and the optical axis of the lens assembly 20 coincides with the direction of the central axis a. In this embodiment, the optical axis of the lens assembly 20 is parallel to the central axis a.
The outer housing assembly 10 includes an inner housing 103 and an outer housing 104. The shell 104 is made of plastic, the shell 104 can be made of plastic materials which have high strength and good weather resistance and can be used as a stress piece, and the shell 104 mainly plays a role in protection and meets the requirements of water resistance, explosion resistance, corrosion resistance and the like. The inner casing 103 is made of a heat conductive plastic, for example, a plastic substrate is filled with a heat conductive filler to improve its heat conductive performance, and the inner casing 103 mainly plays a role in heat conduction and heat dissipation. The outer shell 104 covers the outer side of the inner shell 103, and the shape of the outer shell 104 is matched with the shape of the inner shell 103, so that the outer surface of the inner shell 103 is attached to the inner surface of the outer shell 104, the joint area is increased, and the heat transfer efficiency is improved. Meanwhile, the inner shell 103 and the outer shell 104 are kept relatively fixed through a connecting structure, and the inner shell 103 and the outer shell 104 are prevented from falling off. In one embodiment, the inner housing 103 and the outer housing 104 may be integrally molded by two-shot molding, but are not limited thereto.
The camera 100 further comprises a main board assembly 50, the electronic device 30 is disposed on the main board assembly 50, and the electronic device 30 comprises an image sensor and a processing chip. In this embodiment, the image sensor and the processing chip share the same printed circuit board. The electronic device 30 generates heat during operation, and heat dissipation of the electronic device 30 is required. The heat dissipation panel beating 40 combines with electron device 30 and inner shell 103 for electron device 30, heat dissipation panel beating 40 and inner shell 103 three realize thermal conduction, make the heat that electron device 30 self produced transmit for inner shell 103 through heat dissipation panel beating 40, and inner shell 103 evenly disperses the heat to further conduct to outer shell 104, radiate to the external world through outer shell 104 in order to realize the heat dissipation.
The camera 100 provided by the application adopts the shell subassembly 10 of plastics material, wherein shell subassembly 10 has adopted the outer shell 104 of plastics material and the combination scheme of the inner shell 104 of heat conduction plastics material, and wherein, the material of outer shell 104 can satisfy intensity, waterproof and anti-riot demand, and the material of inner shell 103 satisfies the heat dissipation demand, has realized with low costs, good performance, manufacturing process environmental protection. Meanwhile, the inner shell 103 and the outer shell 104 are kept relatively fixed through a connecting structure, so that the risk of falling off of the inner shell 103 and the outer shell 104 is reduced or even avoided.
Referring to fig. 3 to 5, fig. 3 is a schematic view of the inner housing 103. Fig. 4 is a schematic view of the housing 104. Fig. 5 is a sectional view of the inner case 103 and the outer case 104 in a state of engagement. In one embodiment, the connecting structure comprises a recess and a protrusion with matched shapes, one of the inner shell 103 and the outer shell 104 is provided with the recess, the other is provided with the protrusion, and the protrusion is arranged in the recess. In one embodiment, the recess is implemented as a groove 1030 and the protrusion is implemented as a protrusion 1040, one of the inner shell 103 and the outer shell 104 is provided with the groove 1030, the other is provided with the protrusion 1040, and the protrusion 1040 is disposed in the groove 1030. The connecting structure is simple and convenient to realize. The groove 1030 and the protrusion 1040 may be integrally formed with the inner case 103 and the outer case 104 by injection molding. In this embodiment, the outer surface of the inner housing 103 is provided with a groove 1030, and the inner surface of the outer housing 104 is provided with a protrusion 1040, or vice versa.
In order to improve the stability of the connection between the inner shell 103 and the outer shell 104, a plurality of sets of connection structures may be provided, the sets of connection structures are arranged at intervals around the central axis a between the inner shell 103 and the outer shell 104, and the grooves 1030 and the protrusions 1040 are arranged in a one-to-one correspondence. Specifically, the outer shell 104 includes an inner attaching surface 1042 attached to the inner shell 103, the inner shell 103 includes an outer attaching surface 1032 attached to the outer shell 104, the inner attaching surface 1042 is attached to the outer attaching surface 1032 and extends around the central axis a, and the plurality of sets of connecting structures are disposed around the central axis a on the outer attaching surface 1032 and the inner attaching surface 1042. For example, the outer abutment surface 1032 is provided with recesses 1030 and the inner abutment surface 1042 is provided with projections 1040. The multiple sets of connection structures can enable the inner shell 103 and the outer shell 104 to be engaged at multiple positions in the circumferential direction, and ensure the stability of the relative positions of the inner shell 103 and the outer shell 104 and the reliability of connection.
In one embodiment, along the direction of the central axis a, the inner surface of the outer shell 104 forms an inner step surface with different radial dimensions, the outer surface of the inner shell 103 forms an outer step surface with different radial dimensions, one of the concave portion and the convex portion is disposed on the inner step surface, and the other is disposed on the outer step surface. Specifically, the outer surface of the inner housing 103 includes an outer cylindrical surface 1031 and an outer conical surface 1033 extending around the central axis a and connected to each other, and an abrupt outer side surface is formed at the connection portion of the outer cylindrical surface 1031 and the outer conical surface 1033. The inner surface of the housing 104 includes an inner cylindrical surface 1041 and an inner conical surface 1043 extending around the central axis a, and an inner abrupt surface is formed at the junction of the inner cylindrical surface 1041 and the inner conical surface 1043. The outer cylindrical surface 1031 is attached to the inner cylindrical surface 1041, and the outer conical surface 1033 is attached to the inner conical surface 1043. One of the groove 1030 and the protrusion 1040 is disposed on the inner abrupt surface, i.e., the junction between the inner cylindrical surface 1041 and the inner conical surface 1043, and the other is disposed on the outer abrupt surface, i.e., the junction between the outer cylindrical surface 1031 and the outer conical surface 1033. That is, one part of the groove 1030 and the protrusion 1040 is arranged on the cylindrical surface, the other part is arranged on the tapered surface, and since the surfaces of the groove 1030 and the protrusion 1040 are in different orientations, which makes the groove 1030 and the protrusion 1040 in different orientations in the space, the groove 1030 and the protrusion 1040 can be matched and limited in different orientations, so that the inner shell 103 and the outer shell 104 can be limited in multiple directions in the space, the fixing effect between each other is better, and the stability of the relative position between the inner shell 103 and the outer shell 104 is facilitated. In this embodiment, a groove 1030 is formed at a junction between the outer cylindrical surface 1031 and the outer conical surface 1033 of the inner housing 103, and a protrusion 1040 is formed at a junction between the inner cylindrical surface 1041 and the inner conical surface 1043 of the outer housing 104.
The specific shapes of the groove 1030 and the protrusion 1040 are not limited, and can be selected according to actual requirements. For example, a circular groove, a W-shaped groove, a T-shaped groove, or the like may be provided. In this embodiment, the recess 1030 is a U-shaped recess, the protrusion 1040 is a U-shaped protrusion, and an opening 1034 of the U-shaped recess faces the front end of the lens assembly 20. The U-shaped groove and the U-shaped protrusion are matched, a reverse buckle structure is formed at the bottom of the U-shaped structure, and the inner shell 103 and the outer shell 104 can be prevented from falling off through the reverse buckle structure when the lens component 20 is placed upwards or downwards. In addition, the U-shaped groove and the U-shaped protrusion are simple in forming mode and convenient to process and manufacture.
In addition, the connecting structure further includes a plurality of strip-shaped grooves 1035 disposed on the outer surface of the inner shell 103 and a plurality of strip-shaped protrusions 1044 disposed on the inner surface of the outer shell 104, and the strip-shaped protrusions 1044 are correspondingly disposed in the strip-shaped grooves 1035 to realize the engagement between the inner shell 103 and the outer shell 104.
It is noted that the recess and the projection are only one embodiment of the connecting structure. In other embodiments, the connection structure may be implemented by using a thermal conductive adhesive, for example, and the inner shell 103 and the outer shell 104 are fixed by bonding with the thermal conductive adhesive.
Referring to fig. 6 and 7, fig. 6 is an orthographic view of the inner housing 103 in a direction from the front end to the rear end of the lens assembly along the central axis. Fig. 7 is an orthographic view of the housing 104 in a direction from the rear end to the front end of the lens assembly along the central axis.
In one embodiment, to simplify the structure of the inner and outer shells 103, 104, three sets of connecting structures may be provided and evenly distributed around the central axis a, with 120 ° spacing between each other. That is, three U-shaped grooves are uniformly distributed around the central axis a on the inner case 103, and three U-shaped protrusions are uniformly distributed around the central axis a on the outer case 104.
Referring to fig. 8 and 9, fig. 8 is a schematic view of the outer surface of the inner case 103. Fig. 9 is a cross-sectional view of the housing 104.
In one embodiment, the U-shaped groove has a length L and a width b, and for example, a U-shaped groove with a depth of 1.2mm, and L is 8mm, b is 5mm, may be provided. The shape and size of the U-shaped protrusion are matched with those of the U-shaped groove, the protruding amount of the U-shaped protrusion is S, and S is 1.2 mm. The average wall thickness of the housing 104 is t, and in order to facilitate smooth material flow during injection molding of the housing 104, the thickness of the internal ribs on the housing 104 is 60% or less of the average wall thickness t. In one embodiment, for example, t is 2.2mm, and the thickness of the inner rib needs to be maintained to be 0.8mm or more in consideration of the strength of the inner rib itself, the thickness of the inner rib may be set between 0.8mm and 1.32 mm. For example, the thickness of the inner rib may be set to 1mm, and the thickness m of the U-shaped protrusion may be set to 1mm to meet the design requirement.
In a particular embodiment, the diameter of the inner shell 103
When three U-shaped grooves are uniformly distributed on the outer cylindrical surface 1031 of 76mm in the axial direction, the distance between two adjacent U-shaped protrusions along the circumferential direction of the housing 104 should be set within the range of 70mm to 80 mm. In this case, the U-shaped projection on the housing 104 has a circumferential distance of 76 × pi ÷ 3 ÷ 79.6mm to meet the requirements.
Referring to fig. 2 and 10, fig. 10 is a schematic view of the heat-dissipating metal plate 40 and the thermal pad 60 being joined together.
The heat dissipation sheet metal 40 comprises a base plate 401 and an end plate 402 located at the end of the base plate 401, wherein the end plate 402 is bent relative to the base plate 401. Wherein the base plate 401 is joined with the electronic device 30, the end plate 402 is joined with the inner case 103, and the end plate 402 conforms to the shape of the inner case 103, thereby ensuring efficient heat transfer between the end plate 402 and the inner case 103. In one embodiment, both ends of the base plate 401 are provided with end plates 402, and each end plate 402 is engaged with the inner casing 103, thereby achieving a plurality of heat transfer paths from the base plate 401 to each end plate 402 in different directions to accelerate the heat dissipation rate.
In order to facilitate the bending of the end plate 402, the end plate 402 comprises a plurality of branch metal plates 4020 which are spaced apart from each other and arranged side by side, the branch metal plates 4020 can reduce the rigidity of the end plate 402 and increase the elasticity of the end plate 402, and when the end plate is jointed with the inner shell 103, the branch metal plates 4020 can be better attached to the inner surface of the inner shell 103 through self adaptive deformation.
The camera 100 further includes a thermal pad 60, the thermal pad 60 being sandwiched between an end plate 402 and the inner housing 103, the end plate 402 being coupled to the inner housing 103 via the thermal pad 60. The heat conduction pad 60 can compensate for a gap between the end plate 402 and the inner case 103 due to a machining error, and thus, effective heat transfer can be achieved. The thermal pad 60 may be made of a flexible thermally conductive material.
Referring to fig. 11, fig. 11 is a schematic view of a heat dissipating surface 1037 on a single side of the inner housing 103.
In one embodiment, the inner housing 103 includes a heat dissipation surface 1037 on a single side, the heat dissipation surface 1037 is a sum of an area of the heat transfer surface 10370 where the inner housing 103 contacts the thermal pad 60 and an area of the heat spreading surface 10371 located at the periphery of the heat transfer surface 10370, and an area a of the heat dissipation surface 1037pAccording to RaDetermining;
Ra＝Rc+Rsp+Rh(formula 1)
Rc＝D/(k*Ap) (formula 2)
Rh＝1/(hAp) (formula 4)
Wherein R isaIs the total thermal resistance; rcIs normal phase heat conduction thermal resistance; rspIs diffusion thermal resistance; rhIs convective resistance;
Asthe area of the single-side joint of the heat dissipation metal plate and the inner shell is the area of the single-side joint of the heat dissipation metal plate and the inner shell; k is the thermal conductivity of the inner shell; d is the thickness of the inner shell; h is the convective heat transfer coefficient. Wherein A issK, D, h are selected according to empirical values, then R is presentc、Rsp、RhAre all ApA function of (a) is selected within a certain rangepCalculated as shown in FIG. 11 with respect to RaFitting curve with A, thereby estimating ApThe figure of merit of (1).
In this embodiment, the heat transfer surface 10370 is located in the central region of the heat dissipation surface 1037, and the heat of the electronic device 30 is first transferred to the heat transfer surface 10370 in a concentrated manner, and then is diffused from the heat transfer surface 10370 to the heat dissipation surface 10371 to increase the heat dissipation area, so that the entire heat dissipation surface 1037 can dissipate heat synchronously, and further transferred to the housing 104 through the entire heat dissipation surface 1037. Thereby, the area a of the heat radiation surface 1037 is determinedpThe optimum value of (b) can ensure that the heat transferred to the inner case 103 from the heat-dissipating sheet metal 40 through the heat-conductive pad 60 can be efficiently dissipated.
In one specific embodiment, A is selectedS＝300mm2、k＝3w/(m·k)、D＝1.8mm、h＝10w/(m2K), as can be seen from fig. 12, when Ap is 900mm2The overall thermal resistance Ra rate decreases slowly, taking the overall housing assembly 10 into accountOn the premise of body size, A can be calculatedpThe preferred value Ap of (x) is 900mm2。
In one embodiment, the height dimension W of the inner housing 103 along the central axis a is determined according to the following formula:
wherein h is the convective heat transfer coefficient; g is the acceleration of gravity; alpha is alphaVIs the coefficient of bulk expansion; v is the kinetic viscosity coefficient; delta t is the excess temperature; α is thermal diffusivity. Wherein g, alphaVV, Δ t, α are selected according to empirical values. As can be seen from equation 5, in order to maximize the heat dissipation performance and increase the convective heat transfer coefficient h, the height dimension W of the inner casing 103 needs to be reduced, that is, the height dimension W is inversely related to the convective heat transfer coefficient of the outer casing 10 of the camera. The height dimension W may also be referred to as a depth height W with the placement of the camera 100 in fig. 1 as a reference direction. The figure of merit for height dimension W is derived subject to spatial layout and appearance constraints. In ApHas a preferred value of 900mm2In an embodiment, the height dimension W may be set to 25 mm.
In this embodiment, the heat dissipation metal plate 40 is connected to two portions of the inner shell 103 through the end plates 402 disposed at two ends, and based on this, two heat conduction pads 60 are disposed and are disposed in one-to-one correspondence with the two end plates 402. That is, the two end plates 402 are respectively joined to the inner casing 103 via the thermal pad 60 to form two heat dissipating surfaces 1037, and the area a of each heat dissipating surface 1037pThe optimum value of (c) can be determined in the same manner as above. Wherein the area A of the two heat dissipating surfaces 1037pMay be the same or different.
Referring to fig. 13 and 14, fig. 13 is another sectional view of the inner case 103 and the outer case 104 joined together. Fig. 14 is a plan view of the inner case 103 engaged with the outer case 104.
In one embodiment, the housing 104 includes a fixing post 1045, and the fixing post 1045 is used for fixing components housed in the housing assembly 10, such as the lens assembly 20, the main board assembly 50, and the fill light. The inner shell 103 includes a reinforcing peripheral wall 1036, and the reinforcing peripheral wall 1036 covers or partially covers the outer side of the fixing post 1045. That is to say, the fixing column 1045 is wrapped by the reinforcing peripheral wall 1036, which not only increases the friction force between the inner shell 103 and the outer shell 104, but also ensures that the inner shell 103 and the outer shell 104 are attached more tightly; meanwhile, the strength of the fixing column 1045 is enhanced, and the fixing reliability is enhanced. The fixing post 1045 may be provided with a smooth hole or a threaded hole to facilitate screwing in of a screw or a bolt. The securing posts 1045 may be integrally formed with the outer shell 104 and the reinforcing peripheral wall 1036 may be integrally formed with the inner shell 103.
Referring to fig. 15, fig. 15 is a sectional view of another part of the video camera 100.
The outer casing 104 includes a first outer casing 104a and a second outer casing 104b, wherein the first outer casing 104a is provided with a window 102 facing the lens assembly 20, the inner casing 103 is attached to an inner surface of the first outer casing 104a, the first outer casing 104a covers the inner casing 103 to form a first receiving cavity 1001 with an opening, the second outer casing 104b is in sealing engagement with the first outer casing 104a at the opening side to form a sealed receiving cavity 101, and the second outer casing 104b may be a single-layer structure. The first outer shell 104a is closer to the lens assembly 20 and the electronic device 30 than the second outer shell 104b, and therefore, the inner shell 103 is only attached to the inner surface of the first outer shell 104a, which can reduce the volume of the inner shell 103 and save materials, on the one hand, can also reduce the volume of the heat dissipation sheet metal 40, shorten the heat conduction path between the heat dissipation sheet metal 40 and the inner shell 103, and improve the heat dissipation effect. In this embodiment, the first outer shell 104a and the inner shell 103 are integrally formed by a two-shot molding process.
The camera 100 further includes a seal ring 70, the seal ring 70 being sandwiched between the first housing 104a and the second housing 104b to effect the sealing engagement of the first housing 104a and the second housing 104 b. In one embodiment, as shown in fig. 5, the first outer shell 104a includes an engagement surface 1046 engaged with the second outer shell 104b, and a height difference δ is provided between an end of the inner shell 103 close to the second outer shell 104b and the engagement surface 1046 to form a gap for accommodating the sealing ring 70. The joint surface 1046 is an end surface of the first outer shell 104a at the open end, and the end surface of the first outer shell 104a at the open end is higher than the end surface of the inner shell 103. In one embodiment, the difference in height between the end surface of the first outer shell 104a and the end surface of the inner shell 103 is greater than 3 mm. In an alternative embodiment, the height difference δ is 3.1 mm.
The engagement surface 1046 is further provided with a gasket mounting groove 1047 (refer to fig. 5), and the gasket 70 is disposed in the gasket mounting groove 1047 and surrounds the periphery of the first receiving cavity 1001, so that the first housing 104a is in sealing engagement with the second housing 104 b.
The connection structure includes a first connection structure disposed on an inner surface of the first outer case 104a, and a second connection structure disposed on an outer surface of the inner case 103, the first connection structure receiving the second connection structure, so that the outer surface of the inner case 103 and the inner surface of the first outer case 104 form a thermal conduction channel. In one embodiment, one of the first and second connecting structures is provided with a recess and the other is provided with a projection adapted to the recess, the recess receiving the projection. The concave portion is a groove 1030, and the convex portion is a protrusion 1040.
In this embodiment, the first connecting structure is the projection, i.e., projection 1040, and the second connecting structure is the recess, i.e., recess 1030, which receives the projection.
The camera 100 provided by the present application includes a first outer case 104a, a second outer case 104b, an inner case 103, a power board, a main board assembly 50; the first housing 104a and the second housing 104b are assembled to form a receiving cavity 101, the power board and the motherboard assembly 50 are assembled in the receiving cavity 101, and the power board is electrically connected to the motherboard assembly 50. At least one of the first outer shell 104a and the second outer shell 104b and the inner shell 103 are formed by two-color injection molding, wherein the inner shell 103 is made of heat-conducting plastic, the first outer shell 104a is made of engineering plastic, the first outer shell 104a is wrapped on the outer surface of the inner shell 103, and both the power panel and the motherboard assembly 50 are in thermal conduction with the inner shell 103.
In one embodiment, the camera 100 further includes a heat dissipation sheet metal 40, and the heat dissipation sheet metal 40 is disposed in the accommodating cavity 101; the heat dissipation panel beating 40 with the equipment of first shell 104a, the power strip with mainboard subassembly 50 all with the contact of heat dissipation panel beating 40, through heat dissipation panel beating 40 with the contact of inner shell 103 realizes that heat switches on.
In one embodiment, the heat-dissipating metal plate 40 and the first housing 104a enclose a motherboard receiving cavity, and the motherboard assembly 50 is disposed in the motherboard receiving cavity; the heat dissipation metal plate 40 and the second shell 104b enclose to form a power panel accommodating cavity, and the power panel is arranged in the power panel accommodating cavity; the first outer shell 104a and the inner shell 103 are formed by two-shot injection molding.
In one embodiment, the heat dissipating sheet metal 40 includes a first heat dissipating surface and a second heat dissipating surface disposed opposite to each other; wherein the first heat dissipation surface faces the motherboard assembly 50 and is spaced from the motherboard assembly 50; the second heat dissipation surface faces the power panel and is away from the power panel.
In one embodiment, the motherboard assembly 50 is provided with an electronic device 30 facing the first heat dissipation surface, and a heat conduction interface material is filled between the surface of the electronic device 30 and the first heat dissipation surface, and the heat conduction interface material completely covers the surface of the electronic device 30 after being compressed, so as to realize efficient heat transfer.
In one embodiment, the thermally conductive interface material is silicone rubber; and/or the compressibility of the thermal interface material ranges from 10% to 30%.
In one embodiment, the heat dissipation sheet metal 40 includes a base plate 401 and an end plate 402 disposed at an edge of the base plate 401 and abutting against the inner shell 103, an inner surface of the inner shell 103 is an arc surface, an outer side surface of the end plate 402 is an arc surface, and an outer side surface of the end plate 402 is attached to the inner surface of the inner shell 103.
In one embodiment, the area ratio of the inner surface of the inner shell 103 to the outer side surface of the end plate 402 is not less than 1: 3.
in one embodiment, the video camera 100 further includes a lamp panel electrically connected to the power board and the motherboard assembly 50; the lamp plate is assembled on the inner surface of the inner shell 103, and the surface of the lamp plate is attached to the inner surface of the inner shell 103.
In one embodiment, the camera 100 further includes a fixing member, a through hole matched with the fixing member is formed on the lamp panel, and a positioning hole corresponding to the through hole is formed on the inner surface of the inner shell 103; the lamp panel passes through the mounting with the through-hole, the cooperation of locating hole is assembled in the internal surface of inner shell 103.
In one embodiment, the camera 100 further comprises a seal ring; the upper edge of the inner case 103 is lower than the upper edge of the layer of the first outer case 104a to form a step having a height difference, and the sealing ring is assembled to the step to seal the gap between the first outer case 104a and the second outer case 104 b.
In one embodiment, the maximum thickness of the inner shell 103 is no more than 1.8 mm; and/or the first shell 104a has a maximum thickness of at least 2.2 mm.
In one embodiment, the camera includes an inner housing 103 made of a thermally conductive plastic material and a first outer housing 104a made of a plastic material, wherein the first outer housing 104a encloses the inner housing 103 to form a first receiving cavity 1001 with an opening, and the inner housing 103 is defined as: at the end surface on the open side, the end surface of the first outer case 104a is higher than the end surface of the inner case 103; the heat dissipation sheet metal 40 comprises a substrate 401 and an end plate 402 positioned at the end part of the substrate 401; lens subassembly 20 by heat dissipation panel beating 40's base plate 401 supports, lens subassembly 20 with heat dissipation panel beating 40 all set up in accept in the chamber 101, so that heat dissipation panel beating 40's end plate 402 with the internal surface of inner shell 103 constitutes the face contact, makes the heat that lens subassembly 20 produced flows through in proper order base plate 401 the end plate 402 the inner shell 103 with first shell 104a distributes away to the external world.
In one embodiment, the extending direction of the end plate 402 is the same as the optical axis direction of the lens assembly 20, and the extending direction of the end plate 402 is away from the opening of the first accommodating cavity 1001.
In one embodiment, a first thermal conductive member is filled between the lens assembly 20 and the substrate 401, the first thermal conductive member being defined as: the first thermal conductive member is compressed by the clamping force formed by the lens assembly 20 and the substrate 401.
In one embodiment, a second thermal conductive member, i.e. a thermal pad 60, is filled between the end plate 402 and the inner surface of the inner shell 103, and is defined as: the second heat-conductive member is compressed by the clamping force of the end plate 402 and the inner surface of the inner case, and the compression rate of the second heat-conductive member is not less than that of the first heat-conductive member.
In one embodiment, the camera 100 includes an inner housing 103 having a thermally conductive plastic material; a first outer shell 104a made of plastic, wherein the first outer shell 104a covers the inner shell 103 to form a first accommodating cavity 1001 with an opening; a light filling through hole with a matched shape is formed in one side, away from the opening, of the inner shell 103 and the first outer shell 104 a; the lamp plate sets up in first holding chamber 1001 and the lid is established the light filling through hole to make the heat that the lamp plate produced flows through in proper order inner shell 103 with first shell 104a, wherein, the size of lamp plate is injectd as satisfying: the width of lamp plate is not less than 3 times the lamp pearl width that sets up on the lamp plate, just, the length of lamp plate is not less than 3 times the width of lamp plate.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (11)
1. A camera, comprising:
the outer shell assembly is coated on the outer side of the inner shell, the outer surface of the inner shell is attached to the inner surface of the outer shell, and the inner shell and the outer shell are kept relatively fixed through a connecting structure; and
the lens assembly, the electronic device and the heat dissipation metal plate are contained in the shell assembly, the optical axis of the lens assembly is consistent with the direction of the central axis, and the heat dissipation metal plate is connected with the electronic device and the inner shell and used for transferring heat generated by the electronic device to the inner shell.
2. The camera of claim 1, wherein the connecting structure comprises a recess and a protrusion having a matching shape, one of the inner shell and the outer shell is provided with the recess, the other is provided with the protrusion, and the protrusion is disposed in the recess.
3. The camera of claim 2, wherein the outer housing includes an inner mating surface that mates with the inner housing, the inner housing includes an outer mating surface that mates with the outer housing, the inner and outer mating surfaces extend around the central axis, and the connecting structure is provided in a plurality of sets and is disposed at intervals around the central axis between the outer and inner mating surfaces.
4. The camera of claim 2, wherein the outer surface of the inner housing comprises an outer cylindrical surface and an outer conical surface extending around the central axis, the inner surface of the outer housing comprises an inner cylindrical surface and an inner conical surface extending around the central axis, one of the groove and the protrusion is disposed at the junction of the inner cylindrical surface and the inner conical surface, and the other is disposed at the junction of the outer cylindrical surface and the outer conical surface.
5. A camera according to claim 2, wherein the recess is provided as a U-shaped recess and the projection is provided as a U-shaped projection, the U-shaped recess opening towards the front end of the lens assembly.
6. The camera of claim 1, wherein the heat sink sheet metal includes a base plate and an end plate connected to an end of the base plate, the end plate being bent relative to the base plate, the base plate being engaged with the electronic device, the end plate being engaged with the inner housing, the end plate having a shape that conforms to a shape of the inner housing.
7. The camera of claim 6, further comprising a thermal pad, wherein the header plate is coupled to the inner housing via the thermal pad, wherein the inner housing comprises a heat dissipation surface on a single side, wherein the heat dissipation surface is a sum of an area of a heat transfer surface of the inner housing in contact with the thermal pad and an area of a heat spreading surface on a periphery of the heat transfer surface, and wherein an area A of the heat dissipation surface ispAccording to RaDetermining;
Ra＝Rc+Rsp+Rh
Rc＝D/(k*Ap)
Rh＝1/(hAp)
wherein R isaIs the total thermal resistance; rcIs normal phase heat conduction thermal resistance; rspIs diffusion thermal resistance; rhIs convective resistance;
Asthe area of the single-side joint of the heat dissipation metal plate and the inner shell is the area of the single-side joint of the heat dissipation metal plate and the inner shell; k is the thermal conductivity of the inner shell; d is the thickness of the inner shell; h is the convective heat transfer coefficient.
8. The camera of claim 1, wherein a dimension W of the inner housing in the central axis direction is determined according to the following formula:
wherein h is the convective heat transfer coefficient; g is the acceleration of gravity; alpha is alphaVIs the coefficient of bulk expansion; v is the dynamic viscosity coefficient; delta t is the excess temperature; α is thermal diffusivity.
9. The camera of claim 1, wherein the outer housing comprises a fixed post and the inner housing comprises a reinforced enclosure wall, the reinforced enclosure wall being wrapped or partially wrapped around an outside of the fixed post; and/or
The shell with the shell passes through double-shot moulding integrated into one piece.
10. The camera of claim 1, wherein the housing comprises a first housing and a second housing that are separately disposed, the lens assembly and the electronics are disposed within the first housing, the inner housing is attached to an inner surface of the first housing, and the second housing is disposed as a single-layered housing.
11. The camera of claim 10, wherein the first outer housing is in sealing engagement with the second outer housing, the first outer housing including an engagement surface in sealing engagement with the second outer housing, an end of the inner housing proximate the second outer housing being at a height differential from the engagement surface to form a gap to accommodate a sealing ring that seals the first outer housing to the second outer housing.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111358312.6A CN114157781B (en) | 2021-11-16 | 2021-11-16 | Video camera |
| PCT/CN2022/105899 WO2023087755A1 (en) | 2021-11-16 | 2022-07-15 | Camera, and shell assembly of camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111358312.6A CN114157781B (en) | 2021-11-16 | 2021-11-16 | Video camera |
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| CN114157781A true CN114157781A (en) | 2022-03-08 |
| CN114157781B CN114157781B (en) | 2024-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111358312.6A Active CN114157781B (en) | 2021-11-16 | 2021-11-16 | Video camera |
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| CN114157781B (en) | 2024-03-01 |
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