Patent Publication Number: US-2006007690-A1

Title: LED lamp

Description:
BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      This invention relates to an LED lamp, particularly to one provided with lamp base, a transparent shell formed on the lamp base and having an annular resting edge in an inner annular wall for securing a lamp unit thereon. The lamp unit consists of an electric circuit board and a plurality of LED (light emitting diodes), connected electrically with the lamp base. Further, a transparent cap is provided to cover on the transparent shell so that the light of the LED may shine sidewise and forward through the transparent shell and the transparent cap, reaching a comparatively wide range.  
      2. Description of the Prior Art  
      Common conventional lamps  1  for vehicles shown in  FIG. 1  generally have a lamp base  10  and a lamp  11  positioned on the lamp base  10 , and the lamp  11  is made of tungsten filaments, which is apt to get extremely hot and to break during running of a vehicle, in addition to its brilliant shining to irritate eyes.  
     SUMMARY OF THE INVENTION  
      This invention has been devised to offer an LED lamp provided with a light unit positioned on an annular resting edge of a transparent shell on a lamp base, and a transparent cap positioned on the transparent shell and covering over the light unit, letting the light of the LED lamp of the light unit shine forward and sidewise through the transparent cap and the transparent shell.  
      The feature of the invention is a lamp base, a transparent shell formed on the lamp base and having an annular resting edge in the annular wall and an annular step near the upper end above the resting edge, and a lamp unit arranged in the transparent shell on the lamp base and consisting of an electric circuit board and a plurality of LED. The lamp unit is electrically connected with the lamp base, and the electric circuit board is positioned on the annular resting edge of the transparent shell, with a transparent cap provided with a flange fitting with the annular step of the transparent shell for covering over the LED lamp. 
    
    
     BRIEF DESCRIPTION OF DRAWINGS  
      This invention will be better understood by referring to the accompanying drawings, wherein:  
       FIG. 1  is a perspective view of a conventional lamp;  
       FIG. 2  is an exploded perspective view of an LED lamp in the present invention;  
       FIG. 3  is a perspective view of the LED lamp in the present invention;  
       FIG. 4  is a side cross-sectional view of the LED lamp in the present invention; and,  
       FIG. 5  is a perspective view of the LED lamp positioned on a reflective plate for use in the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
      A preferred embodiment of an LED lamp in the present invention, as shown in  FIGS. 2, 3  and  4 , includes a lamp base  2 , a transparent shell  20 , a lamp unit  3 , and a transparent cap  4  as main components.  
      The transparent shell  20  is formed on the lamp base  2  of a preferably cylindrical shape, having an annular resting edge  21  formed in an inner annular wall and an annular step  22  formed above the resting edge near an upper end.  
      The lamp unit  3  consists of an electric circuit board  30  and a plurality of LED  31 , and electric wires  32  connecting the lamp unit  3  with the lamp base  2 . The electric circuit board  30  is positioned securely on the annular resting edge  21 , and LED  31  are arranged on an upper surface of the electric circuit board and can also be positioned under the electric circuit board  30 . The lamp unit  3  is arranged to position in the transparent shell  20 .  
      The transparent cap  4  is positioned to cover over the lamp unit  3  and on the transparent shell  20 , having a flange  40  in a lower end to position on the annular step  22  of the transparent shell  20  so as to let the transparent cap  4  secured in position.  
      In assembling, as shown in  FIGS. 2, 3  and  4 , the electric circuit board  30  of the lamp unit  3  is placed securely on the annular resting edge  21  of the transparent shell  20  at first, and then the annular step  22  is coated with waterproof glue. Subsequently, the transparent cap  4  is placed in the transparent shell  2  with the flange  40  seated and bonded on the annular step  22 , finishing the assembly of the LED lamp in the invention.  
      The finished LED lamp can be applied to a reflective plate  5  provided with many reflective surfaces  50 , as shown in  FIG. 5 . Then the light of the LED  31  can shine through the transparent shell  20  and the transparent cap  4  sidewise and forward, and then is reflected to shoot out with different angles in every direction by the reflective surfaces  50  of the reflective plate  5 . Therefore, the bright light of the LED can be cast into a very large area, upgrading the efficiency of illumination.  
      While the preferred embodiment of the invention has been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to over all such modifications that may fall within the spirit and scope of the invention.