KR20180100897A - Surveillance camera assembly - Google Patents

Abstract

Provided is a surveillance camera assembly with excellent internal angle performance, which comprises a surveillance camera; a thermally conductive external housing surrounding the surveillance camera and having an outer surface exposed to the outside; a blocking layer disposed on the outer surface of the external housing to block at least part of heat or light transferred from the outside to the external housing; and a heat sink disposed in the external housing so that a part is in contact with the surveillance camera while the other part is in contact with the external housing to transfer heat generated from the surveillance camera to the external housing.

Description

Surveillance camera assembly < RTI ID = 0.0 >

Embodiments relate to surveillance camera assemblies, and more particularly to surveillance camera assemblies that have excellent cooling performance and are usable in extreme high temperature environments.

When installing a surveillance camera outside a building, the surveillance camera must be protected to maintain performance without being affected by ambient climate change.

For example, in extreme high temperature environments such as the Middle East, surveillance cameras can be exposed to high temperature environments due to solar and geothermal influences. A surveillance camera may also be equipped with a cooling device to cool the surveillance camera if the surveillance camera is to be used in an environment that exceeds the guaranteed limit temperature, which is the temperature range over which it can operate normally.

In order to improve the cooling performance of the surveillance camera, a sunshield made of a plastic material is attached to the outer housing made of a metal, because a cost is incurred when a separate cooling device is installed. European Patent No. 1104625 also adopts a structure in which a shield plate is attached to the outside of the housing of the surveillance camera. However, according to such a light-shielding panel mounting structure, the air layer formed in the space between the shield plate and the housing of the surveillance camera is stagnated, so that heat of the surveillance camera is stagnated without being discharged to the outside. Although a ventilation hole or the like is provided in the shading plate for circulating the air layer, it is not easy to smoothly discharge stagnant heat to the outside.

European Registered Patent No. 1104625 (Jul. 1, 2009)

It is an object of embodiments to provide a surveillance camera assembly having superior cabinet performance.

Another object of the embodiments is to provide a surveillance camera assembly capable of eliminating a temperature rise due to congestion of an air layer inside a housing of a surveillance camera.

It is another object of the embodiments to provide a surveillance camera assembly capable of blocking heat or light transmitted from an outside to a surveillance camera.

A surveillance camera assembly according to an embodiment of the present invention includes a surveillance camera, a thermally conductive outer housing surrounding the surveillance camera and having an outer surface exposed to the outside, at least a heat or light transmitted from the outside to the outer housing, And a heat sink disposed in the interior of the outer housing so as to contact the surveillance camera and another portion to contact the outer housing to transfer heat generated from the surveillance camera to the outer housing.

The surveillance camera may include a circuit board having a camera for capturing an image and a heating element for generating heat to be electrically connected to the camera, and a part of the heat sink may contact the heating element of the circuit board.

The heat sink may include a contact plate including a portion contacting a heating element of the circuit board, and a transmitting plate projecting outwardly from the contact plate and including another portion.

The outer housing may have a contact surface that protrudes from the inner wall of the outer housing to contact the transmission plate.

The transfer plate can be inclined relative to the contact plate and the contact surface of the outer housing can be inclined relative to the inner wall of the outer housing to correspond to the transfer plate.

The surveillance camera assembly may further include a dome cover for transmitting light that is coupled to the end of the outer housing to cover the camera, and the transmission plate may be inclined such that the end of the transmission plate faces the dome cover.

The surveillance camera assembly may further include a first heat transfer medium disposed between the contact surface of the transmission plate and the outer housing to transmit heat.

The surveillance camera assembly may further include a second heat transfer medium disposed between the circuit board and the heat sink to transfer heat.

A plurality of transmission plates may be formed along the circumference of the contact plate.

The transfer plate may extend along at least a portion of the periphery of the contact plate.

The surveillance camera assembly may further include a heat release protrusion or a groove on an outer surface of the outer housing.

In the surveillance camera assembly according to the embodiments as described above, since the barrier layer reflects sunlight or sunlight incident from the outside, it is possible to minimize the phenomenon that the temperature of the surveillance camera assembly rises rapidly even in a very high temperature environment.

Also, in the conventional surveillance camera assembly, the inner air layer maintains the heated state and prevents the heat from being radiated to the outside. In the surveillance camera assembly according to the embodiment, however, Heat can be rapidly discharged to the outside through the outer housing, thereby greatly improving the cooling performance.

In addition, in the surveillance camera assembly according to the embodiment, it is not necessary to provide a structure for forming an air layer in the outer housing, and it is not necessary to provide a separate shield plate for shielding solar heat. Therefore, by using the space occupied by the structure or the shield plate for the air layer By increasing the size of the outer housing, the surface area for discharging the heat transferred from the heat sink to the outside can be increased, and the security camera assembly can be compactly designed while improving the heat radiation performance.

1 is a cross-sectional view schematically showing some components of a surveillance camera assembly according to one embodiment.
FIG. 2 is a partial cross-sectional perspective view illustrating the coupling relationship of some components of the surveillance camera assembly of FIG. 1; FIG.
3 is a perspective view illustrating some components of the surveillance camera assembly of FIG.
4 is a perspective view illustrating the interior of the outer housing of the surveillance camera assembly of FIG.
Fig. 5 is a top view showing some components of the surveillance camera of Fig. 1;
Figure 6 is a cross-sectional view schematically illustrating the flow of heat acting on the surveillance camera assembly of Figure 1;
Figure 7 is a schematic heat transfer model of the surveillance camera assembly of Figure 1;
8 is a cross-sectional view schematically showing a flow of heat acting on a surveillance camera assembly according to a comparative example.
9 is a schematic heat transfer model of a surveillance camera assembly according to a comparative example of FIG.
10 is a graph showing the results of temperature measurement in the monitoring camera assembly of FIG. 6 and the monitoring camera assembly of FIG. 8;
11 is a perspective view of a surveillance camera assembly according to another embodiment.
12 is a partial cross-sectional perspective view showing an incision of a portion of the surveillance camera assembly of FIG.
13 is a partial cross-sectional perspective view showing an incision of a part of a surveillance camera assembly according to still another embodiment.
14 is a top view showing some components of a surveillance camera assembly according to another embodiment.

Hereinafter, the construction and operation of the surveillance camera assembly according to the embodiments will be described in detail through the embodiments of the accompanying drawings.

FIG. 1 is a cross-sectional view schematically showing some components of a surveillance camera assembly according to an embodiment, and FIG. 2 is a partial cross-sectional perspective view showing a separation relationship of some components of the surveillance camera assembly of FIG.

The surveillance camera assembly according to the embodiment shown in Figs. 1 and 2 includes a surveillance camera 10, an outer housing 20 surrounding the surveillance camera 10, and an outer housing 20 disposed on the outer surface 20s of the outer housing 20 And a heat sink 40 which is disposed inside the outer housing 20 and transfers the heat of the surveillance camera 10 to the outer housing 20.

The surveillance camera 10 includes a circuit board 12 having a camera 11 for capturing an image and a heat generating element 12h for generating heat and electrically connected to the camera 11. The camera 11 rotates in the left and right direction and the up and down direction by operating on an externally applied signal, and changes the surveillance region and performs a function of photographing an image.

The camera 11 includes, for example, a lens assembly for receiving image light, an image sensor for converting the image light into an electrical signal, an image processor for processing the signal generated by the image sensor to generate image data, And a driver that generates rotational motion in the left and right and up and down directions to change the area. In addition, the camera 11 is electrically connected to the circuit board 12 that supplies power and controls communication with the outside and controls the operation of the camera.

The outer housing 20 surrounds and protects the surveillance camera 10. The outer housing 20 can perform the function of enclosing the parts generating heat of the surveillance camera 10 in particular. Specifically, the outer housing 20 surrounds parts such as the circuit board 12 that controls the camera 11 and processes photographed images, and functions to receive and protect the parts. The outer housing 20 can also function to discharge the heat generated from the circuit board 12 to the outside of the outer housing 20. [

The outer housing 20 is made of a material at least a portion of which conducts heat. For example, the entire outer housing 20 can be made of a metal material such as aluminum, copper, stainless steel, or the like, .

The embodiments are not limited by the material of the outer housing 20 and a part of the outer housing 20 may be made of plastic and may be made of an outer housing 20 for transferring the heat inside the outer housing 20 to the outside. Another portion of the heat-conductive metal material may be made of a thermally conductive metal material. When a part of the outer housing 20 is made of plastic and the other part is made of a metal material, for example, a part of the plastic part and the part of the metal material can be integrally formed by a method such as heterogeneous injection molding. Alternatively, the outer housing 20 may be manufactured by separately manufacturing the plastic portion and the metal portion of the outer housing 20, and then assembling the plastic portion and the metal portion.

The outer surface 20s of the outer housing 20 is exposed to the outside. A barrier layer 30 is disposed on the outer surface 20s of the outer housing 20 to block heat or light transmitted from the outside to the outer housing 20 or to block both heat and light. The barrier layer 30 has a function of preventing heat or light transmitted from the outside to the outer housing 20 from flowing into the inside of the outer housing 20 by reflecting sunlight or sunlight incident from the outside of the outer housing 20 .

The barrier layer 30 may be formed by forming a metal film such as a silver film by a liquid phase spraying method or a vapor deposition method in which a liquid containing metal salt or metal particles is sprayed on the outer surface 20s of the outer housing 20, Or may be formed by applying a polymer binder mixed with particles to the outer surface 20s. Or the barrier layer 30 may be formed by attaching a reflective film capable of reflecting ultraviolet rays or infrared rays of sunlight to the surface of the outer housing 20.

At the upper end of the outer housing 20, a head 60 for fixing the outer housing 20 to a mounting surface such as a wall surface or a ceiling is coupled. The head 60 also serves as a passage for passing an electric wire including a power line for supplying electricity to the surveillance camera 10 and a signal line for transmitting a signal.

A dome cover 50 of a light transmitting material such as plastic or glass is coupled to the lower end of the outer housing 20 to protect the camera 11 and allow light to pass therethrough. The dome cover 50 is joined to the lower end of the outer housing 20 by a ring-shaped connecting frame 55.

FIG. 3 is a perspective view showing some components of the surveillance camera assembly of FIG. 1, FIG. 4 is a perspective view showing the inside of the outer housing of the surveillance camera assembly of FIG. 1, Is a top view showing the elements.

The heat sink 40 disposed inside the outer housing 20 functions to transfer the heat generated from the surveillance camera 10 to the outer housing 20. A portion 41 of the heat sink 40 contacts the surveillance camera 10. Specifically, the portion 41 of the heat sink 40 contacts the heat generating element 12h of the circuit board 12. [ And another portion 45 of the heat sink 40 is disposed to contact the outer housing 20. [ The heat sink 40 may comprise a material of a thermally conductive metal such as, for example, aluminum, copper, stainless steel, or the like.

The heat sink 40 includes a contact plate 42 that includes a portion 41 that contacts the heating element 12h of the circuit board 12 and a contact plate 42 that protrudes outward from the contact plate 42, And another portion 45 in contact with the surface of the transfer plate 46. Referring to FIG. 3, the heat generated in the heat generating element 12h can be quickly transmitted in the direction of the transmitting plate 46 through the contact plate 42.

The transfer plate 46 is spaced apart in the circumferential direction along the periphery of the contact plate 42, and a plurality of transfer plates 46 are formed. Referring to FIG. 3, three transmission plates 46 are formed around the contact plate 42. Embodiments are not limited by the number of the transmission plates 46, and only one transmission plate 46 may be provided or four or more transmission plates 46 may be provided if necessary.

The outer housing 20 has a contact surface 26 protruding from the inner wall 20b of the outer housing 20 to contact the transmission plate 46 of the heat sink 40. [

The transfer plate 46 of the heat sink 40 is bent with respect to the contact plate 42 so as to be inclined with respect to the contact plate 42. [ The transmission plate 46 is inclined with respect to the contact plate 42 so that the end portion 46e of the transmission plate 46 faces the dome cover 50. [ The contact surface 26 of the outer housing 20 also forms an inclination with respect to the inner wall 20b at an inclination angle equal to the inclination angle formed by the transfer plate 46 with respect to the contact plate 42 (see FIGS. 1 and 2).

As described above, by the structure in which the transfer plate 46 of the heat sink 40 is inclined with respect to the contact plate 42 and the contact surface 26 is inclined relative to the inner wall 20b corresponding to the transfer plate 46 , The transmission plate 46 of the heat sink 40 can be stably supported with respect to the contact surface 26. When the transmission plate 46 is inclined with respect to the contact plate 42 as compared with a structure in which the surface of the transmission plate 46 of the heat sink 40 is formed so as to be in line with the surface of the contact plate 42 The contact area between the transfer plate 46 and the contact surface 26 can be further secured to improve the heat transfer effect.

The embodiments are not limited to the configuration in which the transfer plate 46 of the heat sink 40 is inclined with respect to the contact plate 42. For example, the surface of the transfer plate 46 of the heat sink 40 The structure of the heat sink 40 can be deformed so as to coincide with the surface of the contact plate 42.

A first heat transfer medium 48 for transferring the heat of the heat sink 40 to the outer housing 20 side is disposed between the transfer plate 46 of the heat sink 40 and the contact surface 26 of the outer housing 20 . The first heat transfer medium 48 may be a graphite sheet made of a graphite material in the form of a plate or a thermal grease having an excellent thermal conductivity.

A second heat transfer medium 49 for transferring the heat of the heat generating element 12h to the heat sink 40 side is provided between the heat generating element 12h of the circuit board 12 and the contact plate 42 of the heat sink 40 . The second heat transfer medium 49 may also be a graphite sheet or a thermal grease.

FIG. 6 is a cross-sectional view schematically illustrating the flow of heat acting on the surveillance camera assembly of FIG. 1, and FIG. 7 is a schematic heat transfer model of the surveillance camera assembly of FIG.

6, the barrier layer 30 disposed on the outer surface of the outer housing 20 reflects solar heat and sunlight transmitted from the outside of the surveillance camera assembly to the outer housing 20. As shown in FIG. By reducing the action of the barrier layer 30 to directly introduce solar and sunlight to the outer housing 20, it is possible to reduce the phenomenon that the outer housing 20 is rapidly heated by the external high-temperature environment.

7, there is a thermal resistance of R6 between the second heat transfer medium 49 which is in direct contact with the heat generating element 12h, and between the second heat transfer medium 49 and the heat sink 40, R7 There is a thermal resistance of R8 between the heat sink 40 and the first heat transfer medium 48 and a heat resistance of R9 between the first heat transfer medium 48 and the outer housing 20. [ There is a resistance, and there is a thermal resistance of R10 between the outer housing 20 and the outside.

The resistance to heat (thermal resistance; Rcond) can be expressed by the following equation when heat conduction is performed.

k: thermal conductivity coefficient (W / m K K), A: sectional area (㎡), L: thickness (m)

The heat resistance R8 between the heat sink 40 and the first heat transfer medium 48 in the heat transfer model of the surveillance camera assembly according to the embodiment shown in FIG. 7 is obtained as follows.

8 is a cross-sectional view schematically showing a flow of heat acting on a surveillance camera assembly according to a comparative example. FIG. 8 relates to a comparison example made for the purpose of comparison with the embodiment shown in FIG. 6, and the monitoring camera assembly according to the comparative example has an air layer formed by internal air inside the external housing 120.

Referring to FIG. 8, the monitoring camera assembly according to the comparative example has a structure in which the outer housing 120 has the light shielding plate 120s. Accordingly, since the air layer formed by the inner air is formed between the outer housing 120 and the light shielding plate 120s, heat transmitted from the outside heats the air layer through the light shielding plate 120s, and the air layer heats the outer housing 120 again.

9 is a schematic heat transfer model of a surveillance camera assembly according to a comparative example of FIG. Comparing the heat transfer model of the surveillance camera assembly according to the comparative example of FIG. 9 with the heat transfer model of the surveillance camera assembly of the embodiment shown in FIG. 7, the surveillance camera assembly of FIG. 8 includes the surveillance camera assembly And is modified to have an air layer of internal air between the heat sink 140 and the outer housing 120, unlike the embodiment shown in FIG.

9, there is a thermal resistance of R1 between the heat transfer medium 119 in direct contact with the heat generating element 112h and a thermal resistance of R2 between the heat transfer medium 119 and the heat sink 140 And there is a thermal resistance of R3 between the heat sink 140 and the inner air and a thermal resistance of R4 exists between the inner air and the outer housing 120 and between the outer housing 120 and the outside Lt; RTI ID = 0.0 > R5. ≪ / RTI >

The resistance to heat (thermal resistance; Rconv) can be expressed by the following equation when heat transfer by the convection phenomenon through the air layer is performed.

h: Convective heat transfer coefficient (W / m K K), A: Cross section area (㎡)

In the heat transfer model of the surveillance camera assembly according to the comparative example shown in FIG. 9, the heat resistance R3 between the heat sink 40 and the inside air is obtained as follows.

The maximum value that can be applied to the convective heat transfer coefficient is 8 W / m < 2 > K, and even if the maximum convection heat transfer coefficient is applied, the heat resistance R3 in the heat transfer model of FIG. It can be confirmed that it is about four times larger than the value of the thermal resistance R8.

The total heat resistance value Ra of the heat transfer model in FIG. 7 and the total heat resistance value Rb of the heat transfer model in FIG. 8 can be obtained by applying the values of the heat resistance R8 and the heat resistance R3 calculated through the above-described equations As can be seen, it can be seen that the total heat resistance value of the heat transfer model in FIG. 7 decreases.

 In the surveillance camera assembly according to the embodiment, since the total thermal resistance value is reduced, the temperature in the region where the heating element of the surveillance camera is located is also greatly reduced. The temperature of the heating element in the region where the heating element is located can be calculated by the following equation.

Test: Heating element temperature, T0: Ambient temperature, Q: Heating value (W), Rtot: Total heat resistance value

7 shows that the cooling performance of the surveillance camera assembly according to the embodiment is significantly improved when the temperature Ta of the heating element by the heat transfer model and the temperature Tb of the heating element by the heat transfer model of FIG. 9 are obtained.

In the surveillance camera assembly according to the modification shown in FIG. 8, the air inside the surveillance camera is kept heated by the air layer and the heat is prevented from being emitted to the outside of the surveillance camera. However, in the surveillance camera assembly according to the embodiment The cooling performance is greatly improved by the action of the heat sink in direct contact with the surveillance camera.

In addition, in the surveillance camera assembly according to the embodiment, it is not necessary to provide a structure for forming an air layer for the purpose of causing convection action of air to the outer housing, and it is not necessary to provide a separate shield plate outside the outer housing for shielding solar heat . Accordingly, the space occupied by the structure or the light shielding plate for the air layer is used to increase the size of the outer housing to increase the surface area for discharging the heat transmitted from the heat sink to the outside, thereby improving the heat radiation performance, The size can be kept compact.

10 is a graph showing the results of temperature measurement in the monitoring camera assembly of FIG. 6 and the monitoring camera assembly of FIG. 8;

10 shows a monitoring camera assembly according to an embodiment used in an environment in which the ambient temperature is 70 degrees Celsius and the relative humidity is 90 percent and the monitoring camera assembly according to the embodiment in various positions inside the monitoring camera assembly according to the prior art Are shown in Fig.

It can be seen that the temperature at all locations inside the surveillance camera assembly according to the embodiment is greatly reduced compared to the temperature of the surveillance camera assembly according to the prior art. In the surveillance camera assembly according to the embodiment, the heat inside the surveillance camera assembly can be rapidly discharged to the outside through the outer housing by using a heat sink, and external heat and light can be transmitted to the surveillance camera assembly through the barrier layer on the outer surface of the outer housing. It is possible to greatly reduce the temperature of the internal air existing inside the outer housing as well as the position of the heating element that generates heat of the surveillance camera.

Fig. 11 is a perspective view of a surveillance camera assembly according to another embodiment, and Fig. 12 is a partial cross-sectional perspective view showing an incision of a part of the surveillance camera assembly of Fig.

In the surveillance camera assembly according to the embodiment shown in Figs. 11 and 12, a plurality of heat dissipating grooves 20g are provided on the outer surface of the outer housing 20. The outer housing 20 has a contact surface 26 protruding from the inner wall 20b of the outer housing 20 so as to be in contact with the transfer plate 46 of the heat sink 40. The outer housing 20 has a lower end Is formed at a position adjacent to the contact surface 26 and extends upward so that the upper end of the heat releasing groove 20g extends to the upper end of the outer housing 20. [ The plurality of heat dissipating grooves 20g may be spaced along the circumferential direction of the outer housing 20 and formed parallel to each other.

According to the above-described structure of the heat releasing groove 20g, heat emitted from the contact plate 42 of the heat sink 40 to the contact surface 26 of the outer housing 20 through the transmission plate 46 is heat- And can be quickly discharged to the outside of the outer housing 20 through the grooves 20g for the purpose. At least part of the heat or light transmitted from the outside to the outer housing 20 is blocked by the barrier layer 30 formed on the outer surface of the outer housing 20. [

13 is a partial cross-sectional perspective view showing an incision of a part of a surveillance camera assembly according to still another embodiment.

In the surveillance camera assembly according to the embodiment shown in FIG. 13, a plurality of heat releasing protrusions 20p are provided on the outer surface of the outer housing 20. The outer housing 20 has a contact surface 26 protruding from the inner wall 20b of the outer housing 20 so as to come into contact with the transfer plate 46 of the heat sink 40. The heat- And discharges the heat transferred from the heat exchanger 26 to the outside of the outer housing 20.

The heat released from the contact plate 42 of the heat sink 40 to the contact surface 26 of the outer housing 20 through the transfer plate 46 can be dissipated by heat radiation And can be quickly discharged to the outside of the outer housing 20 through the projection 20p. At least part of the heat or light transmitted from the outside to the outer housing 20 is blocked by the barrier layer 30 formed on the outer surface of the outer housing 20. [

14 is a top view showing some components of a surveillance camera assembly according to another embodiment.

In the monitoring camera assembly according to the embodiment shown in Fig. 14, the configuration of the heat sink 40 has been modified from the configuration of the heat sink of the monitoring camera assembly according to the embodiment shown in Figs. The heat sink 40 includes a contact plate 42 that contacts the heating element of the circuit board and a transmission plate 46 that protrudes outward from the contact plate 42 and contacts the outer housing. The transmission plate 46 extends along the circumferential direction of the contact plate 42 by a predetermined angle (A, B). In Fig. 14, two transmission plates 46 are formed on the outside of the contact plate 42. Fig. The angles A and B of the two transmission plates 46 extending along the circumference of the contact plate 42 may be the same or different from each other.

The embodiment is not limited by the number of transmission plates 46 and only one transmission plate 46 may be provided and extend along the entire periphery of the contact plate 42. [

The construction and effect of the above-described embodiments are merely illustrative, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Accordingly, the true scope of protection of the invention should be determined by the appended claims.

46e: end portion 42: contact plate
10: surveillance camera 45: another part
11: camera 46: transmission plate
12h: heating element 48: first heat transfer medium
12: circuit board 49: second heat transfer medium
20b: inner wall 50: dome cover
20p: projection for heat dissipation 55: connection frame
20g: groove for heat release 60: head
20: outer housing 119: heat transfer medium
20s: outer surface 120: outer housing
26: contact surface 120s: shield plate
30: blocking layer 112h: heating element
40: heat sink 140: heat sink
41: Partial

Claims (11)

Surveillance camera;
A thermally conductive outer housing surrounding the surveillance camera and having an outer surface exposed to the outside;
A blocking layer disposed on the outer surface of the outer housing to block at least part of heat or light transmitted from the outside to the outer housing; And
And a heat sink disposed in the interior of the outer housing such that a portion thereof contacts the surveillance camera and another portion contacts the outer housing and transfers heat generated in the surveillance camera to the outer housing. The method according to claim 1,
The surveillance camera includes a camera for capturing an image and a circuit board having a heating element for generating heat and electrically connected to the camera,
Said portion of said heat sink contacting said heating element of said circuit board. 3. The method of claim 2,
Wherein said heat sink comprises a contact plate including said portion contacting said heating element of said circuit board and a transmission plate projecting outwardly from said contact plate to include said other portion. The method of claim 3,
Wherein the outer housing has a contact surface that protrudes from the inner wall of the outer housing to contact the transmission plate. 5. The method of claim 4,
Wherein the transmission plate is tilted relative to the contact plate and the contact surface of the outer housing is tilted relative to the inner wall of the outer housing to correspond to the transmission plate. 6. The method of claim 5,
Further comprising a dome cover for transmitting light to be coupled to an end of the outer housing to cover the camera,
Wherein the transmission plate is inclined such that an end of the transmission plate faces the dome cover. 5. The method of claim 4,
Further comprising a first heat transfer medium disposed between said transfer plate and said contact surface of said outer housing for transferring heat. 8. The method of claim 7,
And a second heat transfer medium disposed between the circuit board and the heat sink to transfer heat. The method of claim 3,
Wherein a plurality of the transmission plates are formed along the periphery of the contact plate. The method of claim 3,
Wherein the transmission plate extends along at least a portion of a periphery of the contact plate. The method according to claim 1,
Further comprising a heat dissipating projection or groove on the outer surface of the outer housing.

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