Patent Publication Number: US-2012025707-A1

Title: Led lamp

Description:
TECHNICAL FIELD 
     The present invention relates to illuminating techniques, and more particularly, to an LED lamp. 
     BACKGROUND 
     As a new type of light source, LED lamps have advantages of small size, low energy consumption, strong applicability, high stability, short response time, environmental protection, multicolor emitting, etc., and are widely used in the fields of lighting and decoration. The lamps with a light source of high power LEDs have advantages of high efficiency of emitting, energy-saving, environmental protection, etc. On the other hand, traditional abandoned fluorescent lamps easily bring out mercury pollution, thereby, it&#39;s urgent to use LED lamps to replaces traditional fluorescent lamp. The traditional LED lamp mainly includes a lamp body, plugs respectively disposed at the both ends of the lamp body, an LED lath disposed inside the lamp body, driving powers electrically connected between lamp pins inside the plugs and the LED lath. The lamp body includes a heat dissipating cover and a light-transmissive cover. At present there are two methods of arrangement of the driving power in the existing technology. The first method is that the driving power is interposed between the heat dissipating cover and the LED lath. The second method is that the driving power is disposed at the both ends of the LED lath. The LED lamp using the first method has disadvantages of obvious light spots of LED and low safety coefficient. The LED lamp using the second method has disadvantages of shadow occurring at both ends of the LED lamp and low safety coefficient. 
     Furthermore, the LED lamp produces a quantity of heat when LED lamp is working. The traditional LED lamp usually has a problem of terrible heat dissipation. so there is safety trouble that a quantity of heat accumulation could burn the driving power or the LED lamp. 
     SUMMARY 
     Therefore, according to an aspect of the present invention, an LED lamp is provided for improving of the traditional LED lamp, and avoiding the shadow of the LED lamp, and improving emitting effect. 
     An LED lamp includes a lamp body, an LED lath inside the lamp body, plug modules disposed at both ends of the lamp body, and driving powers electrically connected the LED lath with the plug modules. The lamp body includes a heat dissipating cover and a light-transmissive cover which are connected with each other. The LED lath includes a lath and a plurality of LEDs disposed along a length direction of the lath. The plurality of LEDs comprising end LEDs disposed at the both ends of the lath, each end LED having a light-emitting surface which is inclined and allows light to be irradiated to the driving power. 
     In the above LED lamp, the end LEDs disposed at the both ends of the lath have inclined light-emitting surfaces, accordingly, the light emitting from the end LEDs disposed at the both ends could irradiate to the driving powers at the both ends, thereby avoiding the shadow of the LED lamp resulting from the driving powers, and improving emitting effect. 
     Other objects, advantages and novel features of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which: 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic, front plan view of the LED lamp in accordance with an embodiment of the present invention; 
         FIG. 2  is a schematic, exploded view of the LED lamp in accordance with the embodiment of the present invention; 
         FIG. 3  is a perspective view of the LED lath in accordance with the embodiment of the present invention; 
         FIG. 4  is an enlarged view of section A of  FIG. 2 ; 
         FIG. 5  is an enlarged view of section B of  FIG. 2 ; and 
         FIG. 6  is a schematic, exploded view of the plug module in accordance with the embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Objects, advantages and embodiments of the present invention will be explained below in detail with reference to the accompanying drawings. However, it is to be appreciated that the following description of the embodiment(s) is merely exemplary in nature and is no way intended to limit the invention, its application, or uses. 
     Referring to  FIG. 1  and  FIG. 2  which are the perspective views of the LED lamp. The LED lamp includes a lamp body  1 , an LED lath  2  disposed inside the lamp body  1 , plug modules  3  disposed at both ends of the lamp body  1  and driving powers (not shown) electrically connected the LED lath  2  with the plug modules  3 . The lamp body  1  includes a heat dissipating cover  11  and a light-transmissive cover  12 . The two covers  11 ,  12  are connected with each other. The LED lath  2  includes a lath  21  and a plurality of LEDs  22  disposed along a length direction of the lath  21 . The plurality of LEDs  22  includes end LEDs  22  disposed at the both ends of the lath  21  and each end LED  22  has a light-emitting surface which is inclined and allows light to be irradiated to the driving power. 
     For the LED lamp according to an embodiment of the present invention, these LEDs  22  disposed at the both ends of the lath  21  each have inclined a light-emitting surfaces. The light emitting from LEDs  22  at the both ends could be irradiated to the driving powers at the both ends, thereby avoiding the shadow of LED lamp, and improving the emitting effect. 
     Referring to  FIG. 1  and  FIG. 2 , the lath  21  is attached on the inside of the heat dissipating cover  11  by silicone film. The silicone film with thermal conductivity between  4 - 5  is provided with double functions of heat conductive and insulative. Through attaching the lath  21  on the heat dissipating cover  11 , heat generated from the LEDs  22  disposed along the length direction of lath  2  can be uniformly and quickly transferred to the heat dissipating cover  11 . This effectively protects the LEDs  22  and the lath  1 , and prolongs working life thereof. 
     In this embodiment, the driving powers (not shown) are respectively disposed at the both ends of the lamp body  1 , and connected with the LED lath  2  and the plug module  3 . Because the driving powers are respectively disposed at the both ends of the lamp body  1 , in the traditional LED lamp, the mounted LED lamps can&#39;t irradiate to the driving powers, accordingly, shadows is formed at position of the driving powers which in turn produces influence on effect of irradiation. In the embodiment, the end LEDs  22  disposed at the both ends of the lath  21  each are in a rhombic shape, and are decliningly welded on the lath  21 . Meantime, in order to improve illumination, each end of the lath  21  is provided with two rhombic end LEDs  22  disposed thereon. The two rhombic end LEDs  22  at each end are radially arranged on the lath  21 , and enlarges the scope of the irradiation thereof In this declining way, the light-emitting surfaces of the rhombic end LEDs  22  are oriented to directly irradiate to the driving powers which are disposed at the both ends of the lamp body  1 . Accordingly, when the entire lath  2  emitting, others LEDs  22  on the lath  2  except of the end LEDs axially irradiate the lamp body  1 , and the both ends of the light-transmissive cover  12  are illuminated. Meanwhile, the light emitted by the rhombic end LEDs  22  disposed at the both ends of the laths is directly irradiated towards the driving powers. A part of the light from the end LEDs  22  illuminates the driving powers and would not produce shadows, while another part of the light emitted by the rhombic end LEDs  22  is reflected to the light-transmissive cover  12  by the driving powers. The reflected light further strengthens the illuminating intensity of the both ends of light-transmissive cover  12 . This improves the effect of illumination of LED lamp, and would not produce shadows at both ends. 
     Since the light-emitting surfaces of the rhombic end LEDs  22  have structure of curved surface, when curved light-emitting surfaces satisfy enough irradiation, the rhombic end LEDs  22  may be directly welded on the lath  21  other than to be bonded via inclining weld. 
     Furthermore, the end LEDs  22  disposed at the both ends of the lath  21  also could be in other shapes, such as rectangle. The rectangular end LEDs  22  are decliningly welded on the lath  21 . The declining angle is defined by factors such as the shape of the driving power. Therefore, the rectangular end LEDs  22  decliningly positioned are provided with light-emitting surfaces that could directly irradiate to the driving power, thereby avoiding the shadow produced by sheltering of the driving power, and improving the emitting effect of the LED lamp. 
     In this embodiment, in order to be easy to disassemble and fix the lamp body  1 , the heat dissipating cover  11  and the light-transmissive cover  12  use buckle structure. Referring to the  FIG. 4 , cross section of the heat dissipating cover  11  is in a shape of “C”, flanges with axial buckle grooves  111  are axially provided at both sides of the outside of the peristome of the “C” shape of the heat dissipating cover  11 . Please referring to  FIG. 5 , cross section of the light-transmissive cover  12  also is in a shape of “C”, rib strips  121  that could engage into the buckle grooves  111  extend inwardly and defined at the both sides of the inside of the peristome of the “C” shape of the light-transmissive cover  12 . The connecting structure of the heat dissipating cover  11  and the light-transmissive cover  12  is not only limited to above structure, but also could be replaced by other fixing structures that are easy to disassemble and reliably connect. 
     Specificially, referring to  FIG. 4 , in the embodiment, finny heat dissipating ribs  112  are axially and parallelly disposed on an exterior of the heat dissipating cover  11  in uniform interval. Two concaved recessiones  113  are defined in both ends of the heat dissipating cover  11 . Threaded holes are defined in the axial end surface of the heat dissipating cover  11 . In the embodiment, the heat dissipating cover  11  is made from ceramic material with good thermal conductivity, or alternatively other materials with good thermal conductivity, such as Aluminium. 
     Specificially, the light-transmissive cover  12  is made of PC (Polycarbonate) light diffusing material, which improves the light diffusion and provides the lamp with uniform light effect, and better luminous effect, because the LED pots can&#39;t be seen from outside of the lamp body  1 . 
     Furthermore, in order to satisfy the related safety regulation of the LED lamp, avoid of being fired by accumulating quantity of heat when the driving power is working, and improve safety thereof. In this embodiment, the driving power is disposed inside a thermal conductive and insulated shell  4 . The thermal conductive and insulated shell  4  is disposed in the recession  113  defined at the both ends of the heat dissipating cover  11 . Therefore, the quantity of heat in the driving power quickly conduct to the heat dissipating cover  11  by the thermal conductive and insulated shell  4  through which dissipates the quantity of the heat to the air. Furthermore, in this embodiment, in order to strengthen conductive effect of heat, a thermal conductive silica gel (not shown in the figure) is fixed inside the thermal conductive and insulated shell  4 . Meanwhile, high pressure test on the anyplace of outside of the lamp body  1  should be passed while using the thermal conductive and insulated shell  4 . Thus, the lamp is safe and reliable. 
     Specificially, referring to  FIG. 2  and  FIG. 6 , the plug module  3  includes a plug  31  and pins  32  that extend though the plug  31  and electrically connected with the driving power. The plug  31  is formed with threaded holes  311  corresponding to the threaded holes  114  through the heat dissipating cover  11 . The plug  31  is connected with the heat dissipating cover  11  by screws  5  which rotate between threaded holes  311  and corresponding threaded holes  114 . Meanwhile, in order to keep feeling of integration, a protective shell  6  covering the screws  5  is disposed outside of the threaded holes  311  in the plug  31 . Therefore, the protective shell  6  and plug  31  is configured as a whole, which provides better aesthetic effect for the lamp. 
     In summary, in the above embodiment of the present invention, the end LED has declining light-emitting surface that could directly irradiate to the two ends of the lamp body  1 , through declining LEDs or LEDs with curved planes which both are disposed at the both ends of the lamp  21 . This avoids the shadow produced by shelter of the two end of the driving power, and improves the illuminative efficiency of LED lamp. In addition, the thermal conductive and insulated shell  4  disposed outside of the driving power accelerates the dissipating efficiency, and high pressure test could be passed on the anyplace of outside of the lamp body  1 , thereby improving safety and reliability thereof. 
     The present invention may be embodied in other forms without departing from the spirit or novel characteristics thereof. The embodiments disclosed in this application are to be considered in all respects as illustrative and not limitative. The scope of the invention is indicated by the appended claims rather than by the foregoing description; and all changes which come within the meaning and range of equivalency of the claims are intended to be embraced therein.