Patent Publication Number: US-9423078-B2

Title: LED lamp

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to Chinese Patent Application No. 201410149873.9 filed on Apr. 15, 2014 in the State Intellectual Property Office Of The P. R. C, the contents of which are incorporated by reference herein. 
     FIELD 
     The disclosure relates to an LED (light emitting diode) lamp, and particularly to an LED lamp with high heat dissipation performance. 
     BACKGROUND 
     Heat generated from an LED lamp may cause a high temperature of the LED lamp, which has a bad effect for a performance and security of the LED lamp. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Implementations of the present technology will now be described, by way of example only, with reference to the attached figures. 
         FIG. 1  is an isometric view showing an LED lamp in accordance with an exemplary embodiment of the present disclosure. 
         FIG. 2  is an exploded isometric view of  FIG. 1 . 
         FIG. 3  is another view of  FIG. 2 . 
         FIG. 4  is a part-sectional view showing one of elements in  FIG. 2 . 
         FIG. 5  is another part-sectional view showing the element in  FIG. 4 . 
     
    
    
     DETAILED DESCRIPTION 
     It will be appreciated that for simplicity and clarity of illustration, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts have been exaggerated to better illustrate details and features of the present disclosure. 
     Referring to  FIGS. 1-3 , an LED lamp  10  comprises a lamp holder  100 , a lamp body  200 , and a light source  300 . The lamp body  200  is connected between the lamp holder  100  and the light source  300 . In at least one embodiment, the lamp holder  100 , the lamp body  200  and the light source  300  can be arranged along bottom to top direction. 
     The lamp holder  100  can be a commonly-used lamp holder such as a standard screw cap. The lamp holder  100  is used for electrically connecting the LED lamp  10  to a power supply or power system. 
     Referring to  FIG. 4 , the lamp body  200  can be made of aluminium alloy, magnesium alloy, zinc alloy, plastic, ceramic, or any other suitable material. The lamp body  200  can be made of heat conduction material. The lamp body  200  comprises a hollow main body  210 , a cup  220 , a tube  230  and a plurality of ridges  240 . 
     The hollow main body  210  comprises a first opening  2101 , a second opening  2102  and a chamber  2103 . The first opening  2101  and the second opening  2102  are communicated to the chamber  2103 . The first opening  2101  is defined at a top end of the hollow main body  210 , and the second opening  2102  is defined at a bottom end of the hollow main body  210 . The first opening  2101  faces the cup  220 . The second opening  2102  is connected to the lamp holder  100 . The chamber  2103  is used for receiving electronic components (not shown). In at least one embodiment, the hollow main body  210  is a hollow cylinder. 
     Referring to  FIGS. 4 and 5 , a plurality of fins  211  can be formed on a periphery  2104  of the hollow main body  210 . A plurality of channels  212  can be defined between the fins  211 . Each channel  212  is defined between two adjacent fins  211 . The fins  211  can be formed in the vicinity of the first opening  2101  of the hollow main body  210 . 
     The cup  220  comprises a first end  2201  and a second end  2202 . A diameter of the second end  2202  is larger than that of the first end  2201 . A hole  221  is defined on the first end  2201 . The hole  221  is formed in the center of the first end  2201 . An orifice  222  is defined in the second end  2202 . A diameter of the orifice  222  is larger than that of the hole  221 . The cup  220  covers the fins  211 . The orifice  222  faces the hollow main body  210 . The fins  221  are connected between an inside surface  224  of the cup  220  and the periphery  2104  of the hollow main body  210 . 
     Each fin  211  is extended beyond the first opening  2101  of the hollow main body  210 . A space  223  is defined between the cup  220  and the first opening  2101  of the hollow main body  210 . The space  223  is connected between the chamber  2103 , the channels  212  defined between the fins  211  and the hole  221  of the cup  220 . 
     The tube  230  is connected to the hole  221  of the first end  2201  of the cup  220 . 
     Air can flow between the chamber  2103  and outside environment through the tube  230 , the hole  221  of the cup  220 , the space  223  between the cup  220  and the hollow main body  210 , and the channels  212  between the fins  211 . 
     Referring to  FIGS. 2, 4 and 5 , the ridges  240  are formed on the cup  220  and around the tube  230 . Each ridge  240  comprises a first wall  241 , a second wall  242  and two third walls  243 . The first wall  241  is opposite to the second wall  242 . The first wall  241  is extended from the outside surface  231  of the tube  230 . The second wall  243  can be a sunken area of the cup  220 . The second wall  243  is sunken from the cup  220  to the hollow main body  210 . The two third walls  243  are opposite to each other. The two third walls  243  are extended from the first wall  241  along the tube  230  to the second wall  242 . The two third walls  243  are connected between the first wall  241  and the second wall  243 . In at least one embodiment, the number of the ridges  240  is three. The three ridges  240  are extended from the outside surface  231  of the tube  230 . An angle between each two adjacent ridges  240  is 120°. The first wall  241  and the two third walls  243  compose a U-shaped structure with a groove  244  defined away from the tube  230 . Each groove  244  is surrounded and formed by the first wall  241 , the second wall  242  and the two third walls  243 . Air can flow between the grooves  244  and outside environment. 
     The light source  300  comprises a plurality of circuit printed boards  310  and a plurality of LED elements  320 . The LED elements  320  are electrically connected to the circuit printed boards  310 . The circuit printed boards  310  can be aluminum base circuit printed board, copper base circuit printed board, fiber-glass circuit printed board, multilayer circuit printed board or flexible circuit printed board et al. Each circuit printed board  310  comprises one first board  311  and two second boards  312 . The two second boards  312  are opposite to each other. The first board  311  is formed on the first wall  241  of the ridge  240 . The two second boards  312  are formed on the two third walls  243  respectively. In at least one embodiment, each circuit printed board  310  shows a U-shaped structure. The one first board  311  can be connected between the two second boards  312 . Each circuit printed board  310  spans over and fittingly engages with one ridge  240 . 
     The LED lamp of the present disclosure also comprises an envelope  400 . The envelope  400  covers the light source  300 . The envelope  400  is coupled to the lamp body  200 . The envelope  400  comprises a through hole  410  and a plurality of gaps  420 . The through hole  410  is coupled to the tube  230 . Each gap  420  is coupled to a corresponding ridge  240 . The envelope  400  can be transparent or semitransparent. The envelope  400  can be made of glass or plastic. In this embodiment, each ridge  240  also comprises an edge  245 . Each edge  245  comprises one first part  2451  and two second parts  2452 . The first part  2451  is extended along a direction from the first wall  241  of the ridge  240  to the envelope  400 . The first part  2451  is perpendicular to the first wall  241  of the ridge  240 . The second part  2452  is extended from the third wall  243 . The second part  2452  is coplanar with the third wall  243 . Each gap  420  is connected to the first part  2451  and the second part  2452  of each ridge  240 . 
     It is to be further understood that even though numerous characteristics and advantages have been set forth in the foregoing description of embodiments, together with details of the structures and functions of the embodiments, the disclosure is illustrative only; and that changes may be made in detail, according in matters of shape, size, and arrangement of parts within the principles of the disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed. 
     The embodiments shown and described above are only examples. Many details are often found in the art such as the other features of an LED lamp. Therefore, many such details are neither shown nor described. Even though numerous characteristics and advantages of the present technology have been set forth in the foregoing description, together with details of the structure and function of the present disclosure, the disclosure is illustrative only, and changes may be made in the detail, especially in matters of shape, size and arrangement of the parts within the principles of the present disclosure up to, and including the full extent established by the broad general meaning of the terms used in the claims. It will therefore be appreciated that the embodiments described above may be modified within the scope of the claims.