Patent Publication Number: US-2018031210-A1

Title: LED lamp

Description:
FIELD OF THE INVENTION 
     The present invention relates to an LED lamp which dissipates heat quickly. 
     BACKGROUND OF THE INVENTION 
     A conventional LED lamp is assembled complicatedly and inefficiently. 
     The LED lamp contains an illumination element welded on a printed circuit board (PCB) and packaged by conductive silver paste, and the PCB is adhered on an aluminum substrate by using thermally conductive adhesive so as to dissipate heat. Furthermore, a heat dissipator is fixed below the aluminum substrate, and a light lens is arranged above the illumination element accommodated in a casing. However, the LED lamp is complicated and cannot remove heat of LED chips of the illumination element quickly. 
     For example, the LED chips are SMD packaged, in-line packaged or COB packaged so as to dissipate the heat via a solid colloidal crystal, a PCB copper foil, an insulating layer, the aluminum substrate, and the heat dissipator. However, the heat dissipation is inefficient to increase a temperature of the LED lamp over 80° C., thus reducing service life of the LED lamp. 
     The present invention has arisen to mitigate and/or obviate the afore-described disadvantages. 
     SUMMARY OF THE INVENTION 
     The primary objective of the present invention is to provide an LED lamp in which each LED chip dissipates heat directly via said each grid unit of the hollow area of the accommodation casing. 
     Further objective of the present invention is to provide an LED lamp in which the accommodation casing is made of metal so as to remove the heat of said each LED chip quickly, thus prolonging service life of the LED lamp. 
     Another objective of the present invention is to provide an LED lamp which is simplified so as to reduce production cost. 
     To obtain above-mentioned objectives, an LED lamp provided by the present invention contains: a printed circuit board (PCB), an accommodation casing, and a closing plate which are stacked and adhered together. 
     The PCB is housed in the accommodation casing, and the closing plate closes the accommodation casing so that the PCB is fixed between the accommodating casing and the closing plate. 
     The PCB ( 20 ) includes a plurality of LED chips die bonded on multiple fixing positions of the PCB, respectively, and the plurality of LED chips are electrically connected with the PCB by way of gold wires. 
     The accommodation casing includes a hollow area defined on a central portion thereof, and the accommodation casing includes a peripheral zone surrounding the hollow area, wherein the hollow area corresponds to an configuration area of the PCB in which the plurality of LED chips are arranged, and the hollow area has multiple hollow grid units corresponding to the plurality of LED chips, respectively. 
     Preferably, a reflective insulation paint layer is sprayed around each of the multiple fixing positions of the PCB. 
     Preferably, each of the multiple grid units has a top face, a bottom face, and a surrounding zone connecting with the top face and the bottom face. 
     Preferably, a height of the top face is lower than that of the peripheral zone, and the bottom face contacts with the reflective insulation paint layer of the PCB, wherein the surrounding zone accommodates each of the plurality of LED chips. 
     Preferably, the surrounding zone has a tilted fence, a first opening defined on a bottom thereof, and a second opening formed on a top thereof, wherein a size of the first opening is less than that of the second opening. 
     Preferably, the plurality of LED chips are arranged in a rectangle array on the PCB and correspond to the multiple grid units which are arranged in a rectangle array on the accommodation casing, and each of the multiple grid units corresponds to and houses said each of the plurality of LED chips. 
     Preferably, the plurality of LED chips are arranged in a sector array on the PCB and correspond to the multiple grid units which are arranged in a sector array on the accommodation casing, and each of the multiple grid units corresponds to and houses said each of the plurality of LED chips. 
     In addition, a thickness of the LED lamp is within 2 mm to 6 mm, and a temperature of the LED lamp is at a temperature of 25° C. to 45° C. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view showing the exploded components of an LED lamp according to a first embodiment of the present invention. 
         FIG. 2  is a perspective view showing the assembly of the LED lamp according to the first embodiment of the present invention. 
         FIG. 3  is a perspective view showing the assembly of a part of the LED lamp according to the first embodiment of the present invention. 
         FIG. 4  is a perspective view showing the exploded components of a part of an LED lamp according to a second embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     With reference to  FIG. 1 , an LED lamp according to a first embodiment of the present invention comprises: a printed circuit board (PCB)  20  in a rectangle shape, an accommodation casing  10  in a rectangle shape, and an elongated closing plate  30  which are stacked and adhered together, wherein the PCB  20  is housed in the accommodation casing  10 , and the elongated closing plate  30  closes the accommodation casing  10  so that the PCB  20  is fixed between the accommodating casing  10  and the elongated closing plate  30 . 
     The PCB  20  includes a plurality of LED chips  21  die bonded on multiple fixing positions of the PCB  20 , respectively, and the plurality of LED chips  21  are electrically connected with the PCB  20  by way of gold wires (not shown), wherein a reflective insulation paint layer is sprayed around each of the multiple fixing positions of the PCB  20 , and the gold wires are arranged on the PCB  20  so as to electrically connect the PCB  20  with the plurality of LED chips  21 . 
     Referring to  FIG. 2 , the accommodation casing  10  includes a hollow area  12  formed in a rectangle shape and defined on a central portion of the accommodation casing  10 , and the accommodation casing  10  includes a peripheral zone  11  surrounding the hollow area  12 , wherein the hollow area  12  corresponds to an configuration area of the PCB  20  in which the plurality of LED chips  21  are arranged, and the hollow area  12  has multiple hollow grid units  121  corresponding to the plurality of LED chips  21 , respectively. 
     As shown in  FIG. 3 , each of the multiple grid units  121  has a top face  1211 , a bottom face  1212 , and a surrounding zone  1213  connecting with the top face  1211  and the bottom face  1212 . 
     A height of the top face  1211  is lower than that of the peripheral zone  11 , and the bottom face  1212  contacts with the reflective insulation paint layer of the PCB  20 , wherein the surrounding zone  1213  accommodates each of the plurality of LED chips  21 . 
     The surrounding zone  1213  has a tilted fence, a first opening defined on a bottom thereof, and a second opening formed on a top thereof, wherein a size of the first opening is less than that of the second opening. 
     The plurality of LED chips  21  are arranged in a rectangle array on the PCB  20  and correspond to the multiple grid units  121  which are arranged in a rectangle array on the accommodation casing  10 , wherein said each grid unit  121  corresponds to and houses said each LED chip  21 . 
     As illustrated in  FIG. 4 , a difference of an LED lamp of a second embodiment from that of the first embodiment comprises: a printed circuit board (PCB)  20  in a circular disc shape and an accommodation casing  10  in a circular disc shape, wherein a plurality of LED chips  21  are arranged in a sector array on the PCB  20  and correspond to multiple grid units  121  of a hollow area  12  which is formed in a circle shape and defined on a central portion of the accommodation casing  10 , wherein the multiple grid units  121  are arranged in a sector array of the accommodation casing  10 , and each of the multiple grid units  121  accommodates each of the plurality of LED chips  21 . 
     Thereby, said each LED chip  21  dissipates heat directly via said each grid unit  121  of the hollow area  12  of the accommodation casing  10 . Preferably, the accommodation casing  10  is made of metal so as to remove the heat of said each LED chip  21  quickly, thus prolonging service life of the LED lamp. 
     In addition, a thickness of the LED lamp is within 2 mm to 6 mm, and a temperature of the LED lamp is at a temperature of 25° C. to 45° C. 
     While the preferred embodiments of the invention have been set forth for the purpose of disclosure, modifications of the disclosed embodiments of the invention as well as other embodiments thereof may occur to those skilled in the art. Accordingly, the appended claims are intended to cover all embodiments which do not depart from the spirit and scope of the invention.