Patent Publication Number: US-2007096132-A1

Title: Coaxial LED lighting board

Description:
BACKGROUND OF THE INVENTION  
      (1) Field of the Invention  
      This invention relates to a lighting board of diode with a coaxial lead to be the light source, which can be used as an indicator, decoration board, amusement combination lighting board, car headlight, or image display.  
      (2) Brief Description of Related Art  
       FIG. 1 . shows a related prior art. It shows a traditional structure of a LED display. Metal wires  10   a  and  10   b  is formed on the top surface of a circuit board substrate  10 . A LED chip  11  has two bottom electrodes  11   a  and  11   b , flip-chip bonded to the substrate  10  with its two bottom electrodes  11   a ,  11   b  respectively coupled to the metal circuits  10   a  and  10   b  of the substrate  10 . Because of the adhesion bonded structure of the chip  11  to the substrate  20 , the prior art has several drawbacks comprising:  
      (a) Lack of flexibility to change different color LED; (b) Lack of flexibility to change different lighting patterns of the display; (c) Inconvenient maintenance for changing a failure LED.  
     SUMMARY OF THIS INVENTION  
      This invention adopts a coaxial diode as its lighting source, with the coaxial single lead of the coaxial diode, the coaxial lighting device is easily to be plug and unplug. A socket plate is designed for accommodation of the coaxial lighting device and therefore forming a simple structure and easily maintained display board. A first object of this invention is to provide a lighting board that is easily to plug and unplug the lighting element. A second object of this invention is to provide a lighting board that is easily to change the displayed pattern. A third object of this invention is to provide a lighting board that is easily to replace a malfunction lighting element. A fourth object of this invention is to provide a lighting board that is assembled without using any solder, glue, nut, bolt or screw in the combination of the elements.  
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       FIG. 1 . is a section view of a prior art LED display.  
       FIG. 2 . is a coaxial LED to be a light, source used in this invention.  
       FIG. 3 . is a first embodiment of this invention.  
       FIG. 4 . is a second embodiment of the socket plate of this invention.  
       FIG. 5 . is a third embodiment of the socket plate of this invention.  
       FIG. 6 . is a fourth embodiment of the socket plate of this invention.  
       FIG. 7 . is a fifth embodiment of the socket plate of this invention.  
       FIG. 8 . is a sixth embodiment of the socket plate of this invention.  
       FIG. 9 . is a seventh embodiment of the socket plate of this invention.  
       FIG. 10 . is an eighth embodiment of the socket plate of this invention.  
       FIG. 11 . is a ninth embodiment of the socket plate of this invention.  
       FIG. 12 . is a tenth embodiment of the socket plate of this invention.  
       FIG. 13 . is an eleventh embodiment of the socket plate of this invention.  
       FIG. 14 . is a twelfth embodiment of the socket plate of this invention.  
       FIG. 15 . is a second embodiment of this invention.  
       FIG. 16 . is a third embodiment of this invention.  
       FIG. 17 . is a fourth embodiment of this invention. 
    
    
     DETAILED DESCRIPTION OF T INVENTION  
       FIG. 2 . is a coaxial LED to be a light s used in this invention.  
       FIG. 2A  shows the top view of a coaxial LED and  FIG. 2B  shows the section view of a coaxial LED.  
      Referring to  FIG. 2A , a light emitting diode chip  11  is mounted on a coaxial lead that comprises an outer metal lead  23  and an inner metal lead  22 , an insulation layer  24  is inserted in between to isolate the outer metal lead  23  and the inner metal lead  22 . The bottom electrodes  11   a ,  1   lb  of the chip  11  are respectively electrically coupling to the outer metal lead  23  and inner metal lead  22 .  FIG. 2B  shows a coaxial LED  100  has an outer metal lead  23  and an inner metal lead  22 , the inner metal lead  22  has its bottom protruded and exposed out of the outer metal lead  23 , an isolation layer  24  is used to isolate the outer metal lead  23  and the inner metal lead  22 . Chip  11  is on the top of the coaxial metal leads, the bottom electrodes  11   a ,  11   b  are respectively coupling to the outer metal lead  23  and inner metal lead  22 .  
       FIG. 3 . is a first embodiment of this invention.  
       FIG. 3  shows a socket plate  200  made of metal/substrate/metal sandwich structure. A step opening  25  is formed in the substrate  20  for the coaxial LED  100  to plug in A piece of metal layer  23   b  is stacked on the top surface of the substrate  20 , and a bottom metal layer  22   b  is stacked on the bottom surface of the substrate  20 . W 1  the LED is inserted, the top metal layer  23   b  of the socket plate  200  is coupling to the outer metal lead  23  of the LED  100  by its side, the bottom metal layer  22   b  is coupling to the inner metal lead  22  of the LED  100  by its side.  
       FIG. 4 . is a second embodiment of the socket plate of this invention.  
       FIG. 4  shows a different design of the socket plate  201  from that in  FIG. 3 ,  FIG. 4  shows that both the top metal  23   b  and bottom metal  22   b  extends into the opening  25  for a better electrically contact inside the opening  25 . Top metal  23   b  bents its end  23   e  into the opening  25  to provide more metal contact area with the outer metal lead  23 , in a similar way, the bottom metal  22   b  bents its end  22   e  into the opening  25  to provide more metal contact area with the inner metal lead  22 . The bending metal  233 ,  22   e  supplies more contact area than that as shown in  FIG. 3  with the electrodes  23 ,  22  of LED  100 .  
       FIG. 5 . is a third embodiment of the socket plate of this invention.  
       FIG. 5  shows a different design for socket plate  202 , it is similar to that of  FIG. 4  except for the amount of the extension metal  23   e ,  22   e .  FIG. 5  shows more extension metal  23   e ,  22   e  bends into the opening  25  for a better electrical contact to the electrodes  23 ,  22  of the coaxial LED  100  when the coaxial LED  100  is inserted.  
       FIG. 6 . is a fourth embodiment of the socket plate of this invention.  
       FIG. 6  shows a further different design for the socket plate  203 , a top metal  33  with extension  33   e  protruded into the opening  35 , and a flat bottom metal  322  sandwich a substrate  30  in between the two metals  3 ,  322 . The extension  33   e  is waiting to be bent when inserting a coaxial LED  100 .  
       FIG. 7 . is a fifth embodiment of the. socket plate of this invention.  
       FIG. 7  shows modification to the bottom metal  322  of  FIG. 6 . The socket plate  204  in  FIG. 7  discloses a bottom metal plate  323  with their extension  32   e  bent inside the opening  35  for better contact with the inner metal lead  22  of the coaxial LED  100  to be inserted.  
       FIG. 8 . is a sixth embodiment of the socket plate of this invention.  
      The previous socket plates provide electrically parallel connection among a plurality of coaxial LEDs  100  to be inserted. However  FIG. 8  shows a socket plate  205  to provide electrically serial connection among a plurality of coaxial LEDs  100 . A Z-shaped metal is inside of the substrate  40  with a top metal  43   t  over the substrate  40  and a bottom metal  43   b  under the substrate  40 .  FIG. 8A  shows the three-dimension view to the z shaped metal  43  that comprises a top metal  43   t  and a bottom metal  43   b  and with openings  45  each on the top metal  43   t  and the bottom metal  43   b . The top metal  43   t  and the bottom metal  43   b  is connected by a connection metal. The top metal  43   t  has metal extensions  43   te  protruded into the opening  45  for bending into the opening  45  when a coaxial LED  100  is inserted, and the bottom metal  43   b  has metal extensions  43   e  protruded into the opening  45  providing flexible contact to the inner lead  22  of the coaxial LED  100  when a coaxial LED  100  is inserted.  
       FIG. 9 . is a seventh embodiment of the socket plate of this invention.  
       FIG. 9  shows still another design to the socket plate  206 , the opening  55  in the substrate  50 A is made rectangle instead of a step in section view. The top metal  53  has extension  53   e  to be bent into the opening  55  becoming a metal contact  53   f  when a coaxial LED  100  inserts. The bottom metal  52  has extension  52   e  to electrically couple with the inner lead  22  of the coaxial LED  100  when a coaxial LED  100  inserts.  
       FIG. 10 . is an eighth embodiment of the socket plate of this invention.  
       FIG. 10  show still another design to the socket plate  207 , the bottom metal  52  is a flat metal plate for a flexible contact with the inner lead  22  of the coaxial LED  100  when a coaxial LED  100  inserts.  
       FIG. 11 . is a ninth embodiment of the socket plate of this invention.  
       FIG. 11  shows double substrates  50 A and SOB, a top metal  53  with extension  53   e  stacks over the first substrate  50 A and a bottom metal  52  with extension  52   e  stacks over the second substrate SOB, top metal  53 , first substrate  50 A, bottom metal  52 , and second substrate  50 B are stacked. The extensions  53   e ,  52   e  are bent inside the opening  55  when a coaxial LED  100  inserts.  
       FIG. 12 . is a tenth embodiment of the socket plate of this invention.  
       FIG. 12  shows a flange  58  is made around the coaxial metal leads as a stop for the coaxial LED  100  to insert properly and remain partially of the metal leads above the surface of the top metal  53  for easily plug and unplug of the coaxial LEDs  100 .  
       FIG. 13 . is an eleventh embodiment of the socket plate of this invention.  
       FIG. 13  shows the bottom metal  62  has a recess  62   r  for accommodation of the inner metal lead  22  of the inserted coaxial LED  100 .  
       FIG. 14 . is a twelfth embodiment of the socket plate of this invention.  
       FIG. 14  shows that protection glue  66  can be used to protect the chip  11  and top portion of the metal lead of the coaxial LED  100 .  
       FIG. 15 . is a second embodiment of this invention.  
       FIG. 15  shows a clip case with a top cover  73  and a bottom cover  72  can be used to pinch the elements of the coaxial LED and the top metal  53 , substrate  50 A, and the bottom metal  62  with a clip structure  75  and without using any glue, solder, nut, bolt, screw . . . ect. in between the elements of the socket plate.  
       FIG. 16 . is a third embodiment of this invention.  
       FIG. 16  shows a permanent sealing case  722  is used for waterproof.  
       FIG. 17 . is a fourth embodiment of this invention.  
       FIG. 17  shows additional waterproof material can be applied around the junction between the coaxial LED  100  and the top surface of the case  722 .  
      A smooth coaxial lead is illustrated in this invention, however, a spiral (not shown in the figure) can be formed around the outer metal  23  of the metal lead  105 , so the lighting device can be screwing into the socket plate  200 . A coaxial LED is illustrated in this invention disclosure, however different lighting device with a coaxial lead can be used according to this invention. While the preferred embodiments have been described, it will be apparent to those skilled in the art that various modification may be made in. the embodiments without departing from the spirit of the present invention. Such modifications are all within the scope of the present invention.  
      Numerical System for the Components  
     
         
           10 ,  20 ,  30 ,  40 ,  50 A,  50 B substrate.  
           10   a ,  10   b ,  22   b ,  23   b ,  32 ,  322 ,  323 ,  33 ,  43 ,  43   t ,  43   b ,  52 ,  53 ,  62  metal  
           100  coaxial LED  
           105  metal electrodes  
           11  LED chip  
          ha, lib electrode.  
           200   208  socket plate  
           22 ,  23  coaxial electrode lead.  
           22   e ,  23   e ,  32   e ,  33   e ,  43   te ,  43   be ,  53   e  metal extension  
           24  insulation material  
           25 ,  35 ,  45 ,  55  opening  
           322 ,  33  metal plate.  
           58  flange  
           62   r  recess.  
           66  protection glue.  
           72 ,  73  clip case.  
           722  sealing case  
           75  clip