LED streetlamp

Abstract

An LED streetlamp is provided that includes: a frame; a main PCB installed in the frame, extending in a longitudinal direction of the frame, and provided with a connector at a first side surface thereof; and a plurality of LED bars, each being coupled to the frame at an end thereof and emitting light by being powered by the main PCB, the LED bars symmetrically arranged with respect to the frame and arranged at regular intervals in the longitudinal direction of the frame.

Claims

1. An LED streetlamp comprising: a frame; a main PCB installed in the frame, the main PCB arranged to extend in a longitudinal direction of the frame and provided with a connector at a first side surface thereof; and an LED unit including a plurality of LED bars, each LED bar coupled to the frame at a first end thereof and emitting light by being powered by the main PCB, the LED bars being symmetric to each other with respect to the frame and arranged at regular intervals in the longitudinal direction of the frame, at at least one side of the frame, wherein the LED bar includes a heat sink, a flexible PCB that is in surface contact with a first surface of the heat sink and is coupled to the main PCB at a first end thereof, and a lens attached to the flexible PCB.

2. The LED streetlamp according to claim 1, wherein the first surface of the heat sink is provided with a pair of coupling recesses spaced from each other in a widthwise direction of the heat sink, a second surface of the heat sink is provided with a first heat-dissipating fin, a second heat-dissipating fin, a third heat-dissipating fin, and a fourth heat-dissipating fin, and the lens has an arch shape and is provided with coupling protrusions at an edge portion thereof, the coupling protrusions fitting in the coupling recesses respectively.

3. The LED streetlamp according to claim 1, wherein the frame includes: a hollow first frame; a second frame in which the main PCB is mounted, the second frame communicating with the first frame and being open at an upper side thereof; and a main cover having a first end that is pivotally coupled to a first end of the second frame, thereby covering the upper side of the second frame to seal the second frame.

4. The LED streetlamp according to claim 2, wherein the first heat-dissipating fin and the fourth heat-dissipating fin protrude from respective side edges of the second surface in a direction perpendicular to the second surface, and the second heat-dissipating fin and the third heat-dissipating fin are arranged between the first heat-dissipating fin and the fourth heat-dissipating fin at regular intervals and protrude from the second surface in the direction perpendicular to the second surface, and wherein the LED streetlamp further includes an end cover having a plurality of U-shaped fixing cavities that are arranged at regular intervals and into which the first to fourth heat-dissipating fins are inserted such that outer surfaces of the first heat-dissipating fin and the fourth heat-dissipating fin are in surface contact with surfaces of the U-shaped fixing cavities.

5. The LED streetlamp according to claim 2, wherein a space defined by an inside surface of the lens and a surface of the flexible PCB is filled with silicone.

6. The LED streetlamp according to claim 3, wherein a first surface of the second frame is provided with: a central recess within which the main PCB is installed; left recesses and right recesses that are symmetrically arranged at left and right sides of the central recess and into which first ends of the LED bars are inserted, the left recesses or right recesses being arranged at regular intervals in a longitudinal direction of the second frame; and mounting brackets that fix the LED bars inserted into the left recesses and right recesses.

7. The LED streetlamp according to claim 6, wherein a first insertion recess is formed between the central recess and the left recess and a second insertion recess is formed between the central recess and the right recess, and wherein a bottom surface of the main cover is provided with a first plate fitting in the first insertion recess and a second plate fitting in the second insertion recess.

Description

DRAWINGS

(1) In order that the disclosure may be well understood, there will now be described various forms thereof, given by way of example, reference being made to the accompanying drawings, in which:

(2) FIG. 1 is a perspective view illustrating a main portion of a light emitting diode (LED) streetlamp;

(3) FIG. 2 is a diagram illustrating an assembling process of an LED streetlamp according to the present disclosure;

(4) FIG. 3 is a diagram sequentially illustrating a manufacturing method of an LED streetlamp according to the present disclosure;

(5) FIG. 4 is a perspective view illustrating an assembled state of an end cover that is a main portion of the LED streetlamp according to the present disclosure;

(6) FIG. 5 is a perspective view illustrating the LED streetlamp from which a main cover is opened;

(7) FIG. 6 is a cross-sectional view taken along a line A-A of FIG. 1;

(8) FIG. 7a is a cross-sectional view taken along a line B-B of FIG. 1;

(9) FIG. 7b is a perspective view illustrating a connection relation between a main PCB and an LED bar that is a main component of the LED streetlamp of the present disclosure;

(10) FIG. 8 is a perspective view illustrating an assembling process of the LED streetlamp according to the present disclosure.

(11) The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way.

DETAILED DESCRIPTION

(12) The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features.

(13) Hereinafter, LED streetlamps according to various forms of the present disclosure will be described with reference to the accompanying drawings.

(14) As shown in FIG. 1, according to the present disclosure, a light emitting diode (LED) streetlamp includes a frame 10, a main printed circuit board (PCB) 20, and an LED unit U.

(15) The frame 10 is a skeleton to which the main PCB 20 and the LED unit U are fixed. The shape and material of the frame 10 can be diversely determined according to designer choice.

(16) The main PCB 20 is mounted within the frame 10 used as a protective member of the LED streetlamp according to the present disclosure. The main PCB 20 is provided with a plurality of connectors 20a. The connector 20a is connected to a flexible PCB 34 of an LED bar 30, thereby transferring electric power supplied from an external power source to the LED bar 30.

(17) The LED bar 30 is coupled to the frame 10 at a first end thereof and emits light when powered via the main PCB 20. The LED bar 30 is present in plural number. The multiple LED bars 30 are symmetrically arranged with respect to the frame 10. The LED bars 30 are arranged at regular intervals in a longitudinal direction of the frame 10. The multiple LED bars 30 constitute the LED unit U.

(18) Taking an example in which the frame 10 is elongated in one direction, the LED bars 30 are symmetrically arranged at left and right sides of the frame 10. Furthermore, the LED bars 30 at either side of the frame 10 are arranged at regular intervals in the longitudinal direction of the frame 10. The LED unit U consists of the multiple LED bars 30 arranged in the way described above.

(19) The LED streetlamp according to the present disclosure includes the multiple LED bars 30 that are arranged at regular intervals and are directly exposed to the air. Therefore, heat generated by the LED bars 30 during light emission can be directly released into the air because the LED bars 30 are nude-type LED lamps. Therefore, according to the present disclosure, a heat dissipation effect is improved and the lifespan of an LED streetlamp is prolonged.

(20) In addition, since the LED bars are spaced from each other, the LED streetlamp according to the present disclosure has good ventilation performance. That is, wind can easily pass between the LED bars. Therefore, the LED streetlamp has high resistance to wind. That is, it can endure strong winds or storms.

(21) As shown in FIGS. 3 and 4, in the LED streetlamp according to the present disclosure, the LED bar 30 includes a heat sink 32, the flexible PCB 34 that is in surface contact with the heat sink 32 and is coupled to the main PCB 20 at a first end thereof, and a plurality of lenses 36 combined with the flexible PCB 34.

(22) The flexible PCB 34 that is attached to a surface of the heat sink 32 is connected to the main PCB 20, thereby receiving electric power, supplied from an external power source, via the main PCB 20.

(23) The heat sink 32 in one form is made of aluminum that is a highly heat conductive material.

(24) Hereinafter, a method for assembling the LED bar 30 will be described in brief.

(25) First, a heat sink 32 that is a bar-like member extending in a direction is prepared, an adhesive is applied to a surface of the heat sink 32, and a flexible PCB having the same length as the heat sink 32 is pasted to the surface of the heat sink 32 via the adhesive.

(26) After the flexible PCB 34 is pasted to the surface of the heat sink 32, bonding is performed using silicone having high thermal conductivity and adhesiveness.

(27) After the flexible PCB 34 is bonded to the surface of the heat sink 32, a plurality of lenses 36 is mounted on the flexible PCB 34. The lenses 36 are arranged in one form at regular intervals on the flexible PCB 34. An output of the LED bar is flexibly adjusted according to the number of lenses mounted on the flexible PCB 34 in the process of manufacturing the LED streetlamp.

(28) The lenses 36 may be filled with silicone. That is, a space defined by an inside surface of each lens 36 and the surface of the flexible PCB 34 is filled with silicone. When the space defined by the inside surface of each lens 36 and the surface of the flexible PCB 34 is vacant, moisture, rainwater, or impurities can permeate into the space, resulting in deterioration in the luminance of the LED streetlamp.

(29) Accordingly, in one form the space is filled with silicone to provide airtight, dustproof, and waterproof effects.

(30) A first surface of the heat sink 32 is provided with a pair of coupling grooves 32a spaced from each other in a widthwise direction thereof. A second surface, opposite to the first surface, of the heat sink 32 is provided with a first heat-dissipating fin 32b, a second heat-dissipating fin 32c, a third heat-dissipating fin 32d, and a fourth heat-dissipating fin 32e arranged in this order and spaced from each other in the widthwise direction.

(31) Specifically, the first heat-dissipating fin 32b and the fourth heat-dissipating fin 32e protrude from respective side edges of the second surface of the heat sink 32 in a direction perpendicular to the second surface, and the second heat-dissipating fin 32c and the third heat-dissipating fin 32d are arranged between the first heat-dissipating fin 32b and the fourth heat-dissipating fin 32e. The first to fourth heat-dissipating fins 32b. 32c, 32d and 32e are arranged at regular intervals in the widthwise direction of the heat sink 32.

(32) That is, the second surface of the heat sink 32 is provided with the first to fourth heat-dissipating fins 32b, 32c, 32d and 32e that protrude from the second surface in the perpendicular direction and are spaced from each other by a predetermined distance. That is, the heat sink 32 is an open type heat sink. Therefore, the heat sink 32 increases a heat dissipation effect.

(33) The lens 36 takes an arch shape. The lens 36 is provided with coupling protrusions 36 fitting in the coupling grooves 32a at edge portions thereof.

(34) The lens 36 functions as a cover. The lens 36 is made of a material that can effectively transmit light therethrough, thereby improving light efficiency of an LED. The space within the lens 36 is filled with heat-resistant, highly-transparent silicone. Therefore, the inside of the lens 36 maintains an airtight, dustproof, and waterproof state.

(35) The lens 36 can be made of various materials. An example of the material is polycarbonate (PC). Furthermore, since the inside of the lens 36 is filled with silicone, dustproof and waterproof effects of a rating of IP68 or higher can be obtained.

(36) In the IP code, the first digit stands for the degree of resistance to dust and the second digit stands for the degree of water resistance. The present disclosure provides a high IP rating.

(37) On the other hand, as shown in FIG. 4, the LED streetlamp according to the present disclosure may further include an end cover 50 having a plurality of reversed U-shaped fixing cavities 50a into each of which the heat sink is inserted such that the first heat-dissipating fin 32b and the fourth heat-dissipating fin 32e are in surface contact with the inside surface of the fixing cavity 50a.

(38) The end cover 50 collectively fixes the ends of the multiple LED bars 30 not to be displaced, thereby providing precise alignment of the LED bars 30.

(39) As shown in FIGS. 5 and 6, the frame 10 of the LED streetlamp according to the present disclosure includes a first frame 12 and a second frame 14.

(40) The first frame 12 is a hollow frame through which a power cable C can pass. The second frame 14 is formed to communicate with a hollow portion of the first frame 12 and an upper side of the second frame 14 is open. The main PCB 20 is mounted within the second frame 14.

(41) The frame may additionally include a main cover 40 that can cover the upper side of the second frame 14. A first end of the main cover 40 is pivotally coupled to a first end of the second frame 14.

(42) The first ends of the main cover 40 and the second frame 14 are coupled to each other by a hinge so that the main cover 40 can pivot to and from the second frame 14. In one form, a push type opening structure is employed. That is, the main cover 40 is opened by means of a spring pin. In order to inhibit accidental opening, second ends of main cover 40 and the second frame 14 are fixed to each other by a fixing member such as a bolt.

(43) In addition, the second frame 14 is provided with a slot extending in a longitudinal direction of the frame to fix the main PCB 20. The main PCB 20 is vertically inserted into the slot.

(44) A rectangular flange P is combined with the power cable C that is used to supply electric power. The flange P inhibits the power cable C from escaping from the LED streetlamp when an impact is applied to the LED streetlamp. The rectangular flange P is inserted into a gap between the main PCB 20 and the first frame 12. Thus, the flange P also functions to securely fix the main PCB 20.

(45) All of the contact points of the main PCB 20, the flexible PCB 34, and the power cable C are in one form plated with solid gold and thus are resistant to corrosion when electric power is supplied.

(46) As shown in FIGS. 7 and 8, a first surface of the second frame 14 is provided with a central recess 14a in which the main PCB 20 is installed, and left recesses 14b and right recesses 14c that are arranged at left and right sides of the central recess 14a and into which ends of the LED bars 30 are respectively inserted. The left recesses 14b or the right recesses 14c are arranged at regular intervals in the longitudinal direction of the second frame 14. The LED streetlamp also further includes mounting brackets 60 that respectively fix the LED bars 30 inserted in the left recesses 14b and the right recesses 14c.

(47) The mounting brackets 60 may have an upside-down letter-L shape. Using the mounting brackets 60 and additional bolts, the LED bars 30 are fixed to the second frame 14. In this case, a spring washer, a flat washer, or the like is first put on a bolt and then the bolt is screwed.

(48) In addition, a first insertion recess 14d is provided between the central recess 14a and the left recess 14b and a second insertion recess is provided between the central recess 14a and the right recess 14c. In one form, the bottom surface of the main cover 40 is provided with a first plate 42 to be inserted into the first insertion recess 14d and a second plate 44 to be inserted into the second insertion recess 14e.

(49) Therefore, the second frame 14 is sealed by the main cover 40 and thus the second frame 14 is in a watertight state.

(50) The description of the disclosure is merely exemplary in nature and, thus, variations that do not depart from the substance of the disclosure are intended to be within the scope of the disclosure. Such variations are not to be regarded as a departure from the spirit and scope of the disclosure.