Street lamp

Disclosed is a street lamp. The street lamp includes:

The present application claims priority under 35 U.S.C. §119(e) of Korean Patent Application Nos. 10-2010-0065215, filed in Korea on Jul. 7, 2010, 10-2010-0065216, filed in Korea on Jul. 7, 2010, 10-2010-0065218 filed in Korea on Jul. 7, 2010, 10-2010-0066139 filed in Korea on Jul. 9, 2010, 10-2010-0066141 filed in Korea on Jul. 9, 2010, 10-2010-0066143 filed in Korea on Jul. 9, 2010, 10-2010-0066145 filed in Korea on Jul. 9, 2010, 10-2010-0066147 filed in Korea on Filing Date Jul. 9, 2010, which are hereby incorporated by reference in its entirety.

BACKGROUND

This embodiment relates to a street lamp.

2. Description of the Related Art

A street lamp is installed at a high position in a road, a pavement or a footpath, etc., which usually get dark at night. The street lamp provides visibility for pedestrians or vehicle drivers and prevents accidents or crimes.

A lamp post is erected and a lamp is attached to the lamp post. Therefore, a street lamp post means a lamp post in which the street lamp is installed.

SUMMARY

One embodiment is a street lamp. The street lamp includes:

an LED module in which a plurality of LEDs are disposed on one side of a substrate; and

a heat radiating body including a convex-up top surface and a bottom surface disposed on the substrate.

Another embodiment is a street lamp. The street lamp includes:

a lamp post including a power supply disposed therein;

a lamp post connector fastened to the lamp post and supported by the lamp post;

an LED module being disposed on one side of a substrate and emitting light by receiving electric power from the power supply of the lamp post; and

a heat radiating body including a top surface and a bottom surface, wherein the top surface is formed inclined to allow fluid to flow along the edge of the heat radiating body and wherein the bottom surface contacts with the other side of the substrate.

Further another aspect of this invention is a street lamp. The street lamp includes:

an LED module in which a plurality of LEDs are disposed on one side of a substrate; and

a heat radiating body including a convex-up top surface and a bottom surface, wherein a plurality of heat radiating fins are arranged on the convex-up top surface in the same direction, and wherein the bottom surface is adjacent to the substrate.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Hereinafter, an embodiment will be described in detail with reference to the accompanying drawings.

FIG. 1is a perspective view of a street lamp according to an embodiment of the present invention.FIG. 2is a side view showing only a lamp lighting unit100and a lamp post connector200of the street lamp shown inFIG. 1.FIGS. 3 and 4show only the lamp lighting unit100and the lamp post connector200of the street lamp shown inFIG. 1, and particularly is an exploded perspective view of the lamp lighting unit100.FIG. 3is a view as viewed from the top of the street lamp.FIG. 4is a view as viewed from the bottom of the street lamp.

Referring toFIGS. 1 to 4, a street lamp according to an embodiment of the present invention includes a lamp lighting unit100, a lamp post connector200and a lamp post300.

The lamp lighting unit100includes at least one light emitting diode (hereinafter, referred to as LED) as a light source. When the LED is included as a light source, the LED is provided with electric power from a power supply (not shown) included in the lamp post300, and then emits light in directions of “A1” to “A3”. The lamp lighting unit100will be described in detail with reference toFIGS. 3 and 4.

Referring toFIGS. 3 and 4, the lamp lighting unit100includes a heat radiating body cover110, a heat radiating body120, a thermal pad130, an LED module140, a connector guide150, a cover glass160, a packing170and a cover glass bracket180.

The heat radiating body cover110covers a contacting part125and a top surface123aof the heat radiating body120. Such a heat radiating body cover110includes a heat radiating opening111formed at a position corresponding to the position of the heat radiating fin121.

The heat radiating body cover110includes an extension part113. The extension part113is fastened to the contacting part125of the heat radiating body120. A connecting portion210and230of the lamp post connector200is inserted between the extension part113and the contacting part125. Thus, the lamp lighting unit100can be fixed and disposed in the lamp post connector200by means of the extension part113and the contacting part125.

A plurality of the LED modules140are disposed in the heat radiating body120. The heat radiating body120receives heat from the plurality of the LED modules140and radiates the heat. Such a heat radiating body120includes the top surface123aincluding a plurality of the heat radiating fins121extending outward, a bottom surface123bon which the plurality of the LED modules140are mounted, and the contacting part125extending outward. The heat radiating body120will be described more specifically with reference toFIG. 5.

FIG. 5is a cross sectional view taken along line1-1′ of the heat radiating body120of the street lamp shown inFIGS. 3 and 4.

Referring toFIG. 5, the heat radiating body120includes the top surface123a, the bottom surface123band the contacting part125.

The top surface123aof the heat radiating body120has a convex-up shape for allowing fluid like rain water to flow along the edge of the heat radiating body120. The top surface123aof the heat radiating body120includes a body123a-1and an edge portion123a-2. The body123a-1includes the plurality of the heat radiating fins121formed thereon. The edge portion123a-2surrounds the outermost of the body123a-1.

The plurality of the heat radiating fins121are formed on the body123a-1of the top surface123a. Each of the heat radiating fins121extends upward and outward from the surface of the body123a-1, and has a shape of a flat plate. All the heat radiating fins121are arranged on the surface of the body123a-1of the top surface123ain parallel with each other and in the same direction.

The edge portion123a-2of the top surface123aincludes at least one draining hole129. The draining hole129functions to drain rain water flowing along the convex-up top surface123aand staying at the outermost of the body123a-1.

As shown inFIGS. 3 and 4, the top surface123aof the heat radiating body120is covered with the heat radiating body cover110. The bottom surface123bof the heat radiating body120is covered with the cover glass bracket180.

At least one LED module140is mounted on the bottom surface123bof the heat radiating body120. Therefore, the bottom surface123bof the heat radiating body120receives heat generated from the plurality of the LED modules140. Here, a surface contacting part123b-1on which the plurality of the LED modules140are mounted is formed on the bottom surface123bof the heat radiating body120. The surface contacting part123b-1may be, as shown inFIG. 5, formed obliquely or horizontally. A case where the surface contacting part123b-1of the heat radiating body120is inclined will be described more specifically with reference toFIG. 6.

FIG. 6is a cross sectional view showing only the cover glass160and the heat radiating body120shown inFIGS. 3 and 4.

Referring toFIG. 6, at least one LED module140is mounted on the bottom surface123bof the heat radiating body120. The bottom surface123bincludes the surface contacting part123b-1which is inclined at an acute angle with respect to the cover glass160. That is, a contact surface of the surface contacting part123b-1forms an acute angle with the surface of the cover glass160.

When the LED module140is mounted on the contact surface of the surface contacting part123b-1of the heat radiating body120, the bottom surface123bof the heat radiating body120receives heat generated by operating the LED module140. Here, a plurality of the surface contacting parts123b-1may be formed on the bottom surface123bof the heat radiating body120. In this case, the contact surfaces of the plurality of the surface contacting parts123b-1may have the same inclination or different inclination from each other.

Meanwhile, the cover glass160has a shape of a flat plate and is disposed apart from the bottom surface123bof the heat radiating body120by a predetermined distance. Here, the cover glass160is parallel with a surface123-2with the exception of the surface contacting part123b-1of the bottom surface123bof the heat radiating body120, and forms an acute angle with the contact surface of the surface contacting part123b-1of the bottom surface123b.

As shown inFIG. 3, the cover glass160is optically coupled to the LED module140such that light generated from an LED143of the LED module140is irradiated to the outside. In other words, the light of the LED143is incident on the cover glass160and is diffused or collected. Here, the cover glass160can perform a function of transmitting the light.

When the LED module140is mounted on the surface contacting part123b-1inclined at an acute angle with respect to the cover glass160, light emitted from the LED143of the LED module140is obliquely incident on the cover glass160, instead of being incident perpendicular to the cover glass160. Then, the light obliquely incident on the cover glass160is diffused or collected according to the optical characteristic of the cover glass160, and then is emitted. Here, regarding the light emitted from the cover glass160, the amount of the light irradiated in a direction “A1” ofFIG. 1may be greater than that of the light irradiated in directions “A2” and “A3”. A more detailed description thereof will be given below with reference toFIG. 7.

FIG. 7is a view for describing the effect caused by structural features of a surface contacting part123b-1of the heat radiating body120.

Referring toFIG. 7, “R1” schematically shows that light is irradiated when the contact surface of the surface contacting part123b-1is not inclined at an acute angle with respect to the cover glass160. “R2” schematically shows that light is irradiated when the contact surface of the surface contacting part123b-1is inclined at an acute angle with respect to the cover glass160.

When the contact surface of the surface contacting part123b-1of the heat radiating body120is not inclined at an acute angle with respect to the cover glass160, the light is not irradiated to a point “S”. When the contact surface of the surface contacting part123b-1of the heat radiating body120is inclined at an acute angle with respect to the cover glass160, the light is irradiated to a point “S”. If the light is required to be irradiated to the point “S” under the condition that the contact surface of the surface contacting part123b-1of the heat radiating body120is not inclined at an acute angle with respect to the cover glass160, the lamp post connector200is required to be extended in a direction “P2” or to be bent in a direction “P1”.

However, when the contact surface of the surface contacting part123b-1of the heat radiating body120according to the embodiment of the present invention is inclined at an acute angle with respect to the cover glass160, the light can be irradiated to the point “S” without extending the lamp post connector200in the direction “P2” or bending the lamp post connector200in the direction “P1”.

An irradiation area R2-A which is formed when the surface contacting part123b-1of the heat radiating body120according to the embodiment of the present invention is inclined at an acute angle with respect to the cover glass160is larger than an irradiation area R1-A which is formed when the surface contacting part123b-1of the heat radiating body120is not inclined at an acute angle with respect to the cover glass160. Accordingly, an irradiation area of the street lamp according to the embodiment of the present invention becomes larger.

The contacting part125of the heat radiating body120will be described again with reference toFIG. 5. Here,FIG. 8is also considered for the sake of convenience of the description.

FIG. 8is an enlarged perspective view showing that the lamp post connector200is connected to the heat radiating body120of the lamp lighting unit100.

Referring toFIGS. 5 and 8, the contacting part125of the heat radiating body120comes in surface contact with a flat portion210of the lamp post connector200and a flat surface of a semi-cylindrical portion230of the lamp post connector200. To this end, the contacting part125of the heat radiating body120includes a seating groove125-1for receiving the flat portion210and the flat surface of the semi-cylindrical portion230. The flat portion210and the flat surface of the semi-cylindrical portion230are inserted and fixed into the seating groove125-1, so that flat portion210and the flat surface of the semi-cylindrical portion230can come in surface contact with the contacting part125of the heat radiating body120.

It is preferable that the contacting part125of the heat radiating body120includes a draining hole125-3. The draining hole125-3functions to discharge fluid generated by a temperature difference between an external temperature and an internal temperature of the street lamp, when the flat portion210of the lamp post connector200and the flat surface of the semi-cylindrical portion230of the lamp post connector200come in surface contact with the contacting part125of the heat radiating body120. If the fluid is not discharged, the heat radiating body120and the lamp post connector200are easily corroded. Therefore, the contacting part125of the heat radiating body120is required to have the draining hole125-3.

The contacting part125of the heat radiating body120is fastened to the flat portion210of the lamp post connector200by means of a fixing means (e.g., a screw, etc.), so that the heat radiating body120can be securely fixed to the lamp post connector200.

As such, the contacting part125of the heat radiating body120comes in surface contact with the flat portion210of the lamp post connector200and the flat surface of the semi-cylindrical portion230of the lamp post connector200, so that the heat radiating body120can transfer a part of heat from the LED module140to the lamp post connector200, whereby there is an advantage that the heat radiating body120can dissipate the heat, which should be radiated by the heat radiating body120itself, to the lamp post connector200. Further, the contacting part125of the heat radiating body120comes in surface contact with the flat portion210of the lamp post connector200and the flat surface of the semi-cylindrical portion230of the lamp post connector200, whereby there is an advantage that the heat radiating body120can be fixed and supported to the lamp post connector200.

Meanwhile, the structural features of the heat radiating body120and the heat radiating body cover110will be described specifically with reference toFIGS. 9 to 11.

FIG. 9is a view showing that a heat radiating body cover110is disposed at positions of peaks of a plurality of heat radiating fins121.FIG. 10is a view showing that a heat radiating body cover110is disposed at positions lower than positions of peaks of a plurality of heat radiating fins121.FIG. 11is a view showing that a heat radiating body cover110is disposed at positions higher than positions of peaks of a plurality of heat radiating fins121.

Referring toFIGS. 9 to 11, the heat radiating body120includes the top surface123a, the bottom surface123band contacting part125. The heat radiating body cover110includes the heat radiating opening111and the extension part113.

The plurality of the heat radiating fins121are formed on the top surface123aof the heat radiating body120. The heat radiating body cover110is disposed on the top surface123aof the heat radiating body120in such a manner as to cover the top surface123aof the heat radiating body120.

The heat radiating body cover110is disposed at positions of peaks of a plurality of the heat radiating fins121. The heat radiating body cover110includes at least one heat radiating opening111or the heat radiating openings111of which the number is the same as the number of the heat radiating fins121. Here, when the heat radiating body cover110includes the heat radiating openings111of which the number is the same as the number of the heat radiating fins121, it is required that the heat radiating opening111should be formed at a position corresponding to the position of the heat radiating fin121.

Meanwhile, the heat radiating fin121is not exactly fitted to the heat radiating opening111. That is, the heat radiating fin121is required to have a size and shape for allowing the heat radiating fin121to freely passing through the heat radiating opening111. Therefore, it is desirable that the plurality of the heat radiating openings111have the same shapes as those of the plurality of the heat radiating fins121and are arranged in parallel with each other in one direction in the same way as the heat radiating fins121are arranged.

The structures shown inFIGS. 9 to 11formed by the heat radiating body cover110and the heat radiating body120causes the heat radiated from the heat radiating body120to be easily exhausted to the outside through the heat radiating opening111of the heat radiating body cover110.

Additionally, it is possible to mitigate the temperature rise of the heat radiating body120caused by sunlight. For example, but for the heat radiating body cover110, the temperature of the heat radiating body120is raised by sunlight as well as the LED module140. As a result, the LED module140may be rather damaged by the heat from the heat radiating body120.

Since the heat radiating body cover110includes the heat radiating opening111, fluid like rain water may be directly flown into the top surface123aof the heat radiating body120through the heat radiating opening111. When fluid is flown into the heat radiating body120, it is possible to easily radiate the heat transferred from the LED module140.

Hereinafter, an arrangement relationship between the heat radiating body cover110and the heat radiating body120will be described.

The arrangement relationship ofFIGS. 10 and 11may be more effective than that ofFIG. 9from the viewpoint of the heat radiation and the flowing-in of the fluid.

FIG. 10shows an arrangement relationship that heat radiating body cover110is disposed at position lower than position of peak of the heat radiating fin121. In this case, the wind or fluid flowing along the top surface of the heat radiating body cover110collides with the peak of the heat radiating fin121and easily flows between the heat radiating body cover110and the top surface123aof the heat radiating body120.

FIG. 11shows an arrangement relationship that heat radiating body cover110is disposed at position higher than position of peak of the heat radiating fin121. In this case, an opening area of the heat radiating opening111is greater than those ofFIGS. 9 and 10. Therefore, a fluid can flow more easily between the heat radiating body cover110and the top surface123aof the heat radiating body120.

Referring toFIGS. 3 and 4again, the thermal pad130is disposed between the surface contacting part123b-1of the heat radiating body120and the LED module140. The thermal pad130can efficiently transfer the heat generated from the LED module140to the heat radiating body120.

The LED module140includes a flat PCB substrate141and a plurality of the LEDs143arranged on one side of the PCB substrate141. The other side of flat PCB substrate141contacts with the bottom surface123bof the heat radiating body120. Unlike general LED modules, such an LED module140may have special structural features. The special structural features of the LED module140will be described specifically with reference toFIG. 12.

FIG. 12is a cross-sectional side view showing only LED module140and the cover glass160.

Referring toFIG. 12, it is required that the flat PCB substrate141of the LED module140should not be in parallel with the flat cover glass160and form a predetermined angle “t” with the flat cover glass160. Here, it is preferable that the predetermined angle “t” is an acute angle.

When the flat PCB substrate141of the LED module140forms a predetermined angle “t” with the cover glass160, light emitted from the LED143of the LED module140is not irradiated in a direction “D1” perpendicular to the cover glass160and is schematically irradiated in a direction “D2”. The effect caused by obliquely arranging the flat PCB substrate141of the LED module140with respect to the cover glass160will be described with reference toFIG. 13.

FIG. 13is a view for describing the effect caused by structural features of a PCB substrate141of the LED modules140.

Referring toFIG. 13, the lamp lighting unit100includes the LED module140and the cover glass160which are shown inFIG. 12.

Referring toFIGS. 12 and 13, “R1” schematically shows that light is irradiated when the PCB substrate141of the LED module140is not inclined at an acute angle with respect to the cover glass160. “R2” schematically shows that light is irradiated when the PCB substrate141of the LED module140is inclined at an acute angle with respect to the cover glass160.

When the PCB substrate141of the LED module140is not inclined at an acute angle with respect to the cover glass160, the light emitted from the LED143of the LED module140is not irradiated to a point “S”. However, when the PCB substrate141of the LED module140is inclined at an acute angle with respect to the cover glass160, the light emitted from the LED143of the LED module140is irradiated to a point “S”.

If the light emitted from the LED143of the LED module140is required to be irradiated to the point “S” under the condition that the PCB substrate141of the LED module140is not inclined at an acute angle with respect to the cover glass160, the lamp post connector200is required to be extended in a direction “P2” or to be bent in a direction “P1”. However, when the PCB substrate141of the LED module140is inclined at an acute angle with respect to the cover glass160, the light can be irradiated to the point “S” or to a point farther than the point “S” only by adjusting the angle of the PCB substrate141of the LED module140without extending the lamp post connector200in the direction “P2” or bending the lamp post connector200in the direction “P1”.

An irradiation area R2-A which is formed when the PCB substrate141of the LED module140according to the embodiment of the present invention is inclined at an acute angle with respect to the cover glass160is larger than an irradiation area R1-A which is formed when the PCB substrate141of the LED module140is not inclined at an acute angle with respect to the cover glass160. Accordingly, an irradiation area of the street lamp according to the embodiment of the present invention becomes larger.

Referring toFIGS. 3 and 4again, the connector guide150is disposed on the bottom surface123bof the heat radiating body120in which the LED module140is mounted. The connector guide150prevents the LED module140from separating from the bottom surface123bof the heat radiating body120. Such a connector guide150has a shape of a rectangular frame. Here, the bottom surface123bof the heat radiating body120is required to have a groove to which the connector guide150is inserted and fixed.

The cover glass160has a shape of a flat plate and is disposed apart from the LED module140mounted on the bottom surface123bof the heat radiating body120by a predetermined distance. More specifically, the cover glass160is mounted on the cover glass bracket180and may be disposed under the LED module140mounted on the bottom surface123bof the heat radiating body120.

The cover glass160is optically coupled to the LED module140such that light generated from an LED143of the LED module140is irradiated to the outside. In other words, the light of the LED143is incident on the cover glass160and is diffused or collected. Here, the cover glass160can perform a function of transmitting the light.

The packing170is inserted and fixed into a packing groove formed on the bottom surface123bof the heat radiating body120and on the cover glass bracket180. The packing170is made of a rubber material or a silicon material and functions to prevent fluid from entering the LED module of an electronic device. In other words, the packing170prevents fluid flowing along the top surface123ato the bottom surface123bof the heat radiating body120from approaching the LED module140.

The cover glass bracket180is disposed to cover the bottom surface123bof the heat radiating body120and has a frame shape having a central opening. A groove for receiving the cover glass160is formed at the inner portion of the cover glass bracket180. A groove for receiving the packing170is formed at the outer portion of the cover glass bracket180.

The lamp lighting unit100is supported by fastening one end of the lamp post connector200to the lamp lighting unit100. The lamp post connector200is supported by fastening the other end of the lamp post connector200to a connecting portion (not shown) of the lamp post300. As shown inFIG. 2, the lamp post connector200has a semi-cylindrical shape and is approximately bent at a right angle. The lamp post connector200has an empty or hollow interior. A cable (not shown) is provided inside the lamp post connector200. The cable transmits electric power from a power supply (not shown) included within the lamp post300to the lamp lighting unit100.

The connecting portion210and230of the lamp post connector200includes the flat portion210and the semi-cylindrical portion230. Here, the connecting portion210and230is formed of a material for receiving heat from the heat radiating body120. For example, the connecting portion210and230may be formed of a material having thermal conductivity, such as aluminum, iron, etc.

The flat portion210is formed extending from the outer surface of the semi-cylindrical portion230and has a flat shape for allowing the flat portion210to come in surface contact with the contacting part125of the heat radiating body120.

The semi-cylindrical portion230has an empty interior and a semi-cylindrical shape. A cable opening235through which a cable (not shown) passes is formed on one side of the semi-cylindrical portion230. Here, a first cable locker270for preventing the cable (not shown) from moving or being damaged may be disposed on the cable opening235. A second cable locker275having the same function as that of the first cable locker270may be disposed with respect to a through portion127passing through the top surface123aand the bottom surface123bof the heat radiating body120.

Meanwhile, a heat radiating body bracket250may be disposed between the extension part113of the heat radiating body cover110and the semi-cylindrical portion230of the lamp post connector200. The heat radiating body bracket250surrounds the semi-cylindrical portion230and has a structure that both sides of the semi-cylindrical portion230are fastened to the flat portion210. Through the addition of the heat radiating body bracket250, the heat radiating body120is strongly fixed to the lamp post connector200.

Referring toFIG. 1, the lower part of the lamp post300is fixed to the ground and extends from the ground. The upper part of the lamp post300is fastened to one end of the lamp post connector200and supports the lamp post connector200. The features of the lamp post300will be described with reference toFIGS. 14 to 17.

FIG. 14is a perspective view showing only the lamp post300shown inFIG. 1.FIG. 15is a cross sectional view taken along line B-B′ of the lamp post300shown inFIG. 14.

Referring toFIGS. 14 and 15, a base310has a flat disk shape and is fixed to the ground. The base310has a structure to which the lower part of a post portion330can be fixed. For example, the lower part of the post portion330may be inserted and fixed into a groove formed at the center of the base310. The base310may be configured to form a projection (not shown) shaped similarly to a connector350at the center of the base310such that the projection is inserted into the lower part of the post portion330. Further, it is noted that the lower part of the post portion330can be mounted on the base310having various shapes.

The post portion330has an empty interior and a shape with a curved surface. The post portion330extends from the ground. The lower part of the post portion330is fixed and mounted on the base310. Here, it is desirable that the outer surface of the post portion330should include at least one flat portion331. Thus, the outer surface of the post portion330with the exception of the flat portion331may have a predetermined curved surface333. According to the most desirable embodiment of the present invention, the post portion330is required to have a semi-cylindrical shape with an empty interior and a curved surface.

The post portion330is required to be made of a material having thermal conductivity so as to efficiently radiate heat generated from a power supply (not shown) disposed within the post portion330.

The connector350extends from a top surface335of the post portion330by a predetermined distance. The connector350also has an empty interior and a shape with a curved surface. WhileFIG. 14shows that the connector350has a semi-cylindrical shape similar to the shape of the post portion330, the connector350may have various shapes without being limited to this. In particular, it is preferable that the connector350is formed to have a shape which can be inserted within one end of the lamp post connector200shown inFIG. 1. That is, if the connector350has a shape the same as or similar to the shape of the one end of the lamp post connector200, the connector50can be easily fastened to the lamp post connector200and support strongly the lamp post connector200. When the connector350is inserted within the end of the lamp post connector200, the end of the lamp post connector200comes in contact with the top surface335of the post portion330. Therefore, the lamp post connector200can be securely fixed to the lamp post300without using another fixing member, for example, a screw.

FIG. 16is a perspective view for describing an additional embodiment of the lamp post300.

Referring toFIG. 16, the flat portion331of the post portion330may have a receiving portion337. In other words, a height difference is formed between the flat portion331and the bottom surface of the receiving portion337.

Advertisements, etc., may be attached to the bottom surface of the receiving portion337. In this case, pedestrians or users can obtain various information.

Particularly, an LCD or LED display device may be attached to the receiving portion337. When the LCD or LED display device is attached to the receiving portion337, the post portion330made of a material having thermal conductivity can easily radiate heat generated from the LCD or LED display device. The post portion330can also provide users with larger amount of information than that of advertisement information.

Here, when the LCD or LED display device is attached to the receiving portion337, a through hole339is required to be formed on the bottom surface of the receiving portion337in order to allow a power cable of the LCD or LED display device to be connected to a power supply (not shown) disposed within the post portion330.

FIG. 17is an enlarged perspective view for describing an additional embodiment of the lamp post300.

Referring toFIG. 17, the post portion330is required to be made of a material having thermal conductivity so as to efficiently radiate heat generated from a power supply400disposed to come in surface contact with the inner surface of an opening/closing portion336of the flat portion331.

The flat portion331has a structure for allowing the inner surface of the opening/closing portion336. For example, the inner surface of the opening/closing portion336may be disclosed to the outside by using a hinge339. Here, the opening/closing portion336is connected to the flat portion331by means of the hinge339. The structure of the opening/closing portion336makes it possible to easily maintain the street lamp.

Measuring equipments500other than the power supply400may be additionally mounted on the inner surface of the opening/closing portion336. The measuring equipments500are also required to come in surface contact with the inner surface of the opening/closing portion336.

The features, structures and effects and the like described in the embodiments are included in at least one embodiment of the present invention and are not necessarily limited to one embodiment. Furthermore, the features, structures, effects and the like provided in each embodiment can be combined or modified in other embodiments by those skilled in the art to which the embodiments belong. Therefore, contents related to the combination and modification should be construed to be included in the scope of the present invention.

Although embodiments of the present invention were described above, theses are just examples and do not limit the present invention. Further, the present invention may be changed and modified in various ways, without departing from the essential features of the present invention, by those skilled in the art. For example, the components described in detail in the embodiments of the present invention may be modified. Further, differences due to the modification and application should be construed as being included in the scope and spirit of the present invention, which is described in the accompanying claims.