Patent Publication Number: US-8529101-B2

Title: Outdoor LED lamp

Description:
BACKGROUND 
     1. Technical Field 
     The present disclosure relates to lamps, and more particularly to an outdoor light emitting diode (LED) lamp having adjustable illumination angle. 
     2. Description of Related Art 
     With the features of long-term reliability, environment friendliness and low power consumption, LED is viewed as a promising alternative for future outdoor lighting products. 
     However, once an outdoor LED lamp is fixed under a determined circumstance, a direction of a light emitted by the LED lamp cannot be changed to meet different requirements. Generally, when it is necessary to change the illumination direction, the outdoor LED lamp must be remounted or redesigned, which is unduly time-consuming and raises production costs. 
     Accordingly, it is desirable to provide an outdoor LED lamp which can overcome the described limitations. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an isometric, assembled view of an outdoor LED lamp of a first embodiment of a present disclosure. 
         FIG. 2  is a cross-sectional view of the outdoor LED lamp of  FIG. 1 . 
         FIG. 3  is a cross-sectional view of an outdoor LED lamp of a second embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Referring to  FIG. 1 , an outdoor LED lamp according to a first embodiment of the present disclosure includes a post  15 , an LED module  11  mounted on a top end of the post  15 , a pair of supporting arms  14  mounted on lateral sides of the post  15  and a reflector  13  mounted on top ends of the supporting arms  14 . 
     Referring also to  FIG. 2 , the LED module  11  includes a disc-like printed circuit board (PCB)  112  and a plurality of LEDs  111  mounted on a top surface of the PCB  112 . 
     The post  15  is a hollow cylinder for wires (not shown) extending therethrough to connect the LED module  11  to an external power source (not shown). A top portion of the post  15  is larger than the other part of the post  15  to form a mounting part  12  thereon. The mounting part  12  includes a top plate  121 . The PCB  112  of the LED module  11  is mounted on a central portion of the top plate  121 . 
     The two supporting arms  14  are located at lateral sides of the mounting portion  12  of the post  15  and cooperatively formed a substantially V-shaped configuration. Each supporting arm  14  includes a first portion  141  and a second portion  142 . The first portion  141  and the second portion  142  are curved. The first portion  141  has a concave surface facing the LED module  11 . The second portion  142  has a convex surface facing the LED module  11 . A bottom end of the first portion  141  is inserted in the mounting part  12  of the post  15 . A top end of the first portion  141  and a bottom end of the second portion  142  pivotally engage with each other via a pivot  143 . Therefore, the second portion  142  can rotates relative to the first portion  141 . A top end of the second portion  142  and an edge of the reflector  13  pivotally engage with each other via another pivot  143 . Therefore, the reflector  13  can rotates relative to the second portion  142  of the supporting arm  14 . Thus, the reflector  13  can rotates to different positions relative to the LED module  11  to reflect light of the LED module  11  to different directions, which adjusts an illumination angle of the outdoor LED lamp. 
     The reflector  13  has a disc-like configuration and is located over the LED module  11 . A size of the reflector  13  is larger than that of the LED module  11 . The edge of the reflector  13  pivotally engages with the top ends of the supporting arms  14  via the pivots  143  therebetween. A central portion of the reflector  13  protrudes towards the LED module  11  to form a concave protrusion portion  132 . Light emitted from the LED module  11  will be diffused to the environment by the reflector  13 . A reflecting film  131  is formed on a bottom surface of the reflector  13  which faces the LED module  11  to enhance a reflecting efficiency of the reflector  13 . The film  131  is a nano-material. 
     Referring to  FIG. 3 , an outdoor LED lamp of a second embodiment of the present disclosure is shown. The outdoor LED lamp is similar to the LED lamp of the first embodiment except the reflector  23 . In this embodiment, the reflector  23  has a central portion of the reflector  23  protruding away from the LED module  11  to form a convex protrusion portion  232 . A reflecting film  231  can also be formed on a bottom surface of the reflector  23  which faces the LED module  11  to enhance a reflecting efficiency of the reflector  23 . 
     As described in the embodiments, the LED module  11  is disposed on a top end of the post  15 , thus almost all of the light emitted by the LEDs  111  goes upwards. The reflector  13 ,  23  arranged over the LED module  11  reflects the light of LEDs  111  to the environment needing illumination. The reflector  13 ,  23  is rotatable relative to the LED module  11 , it can be at different positions relative to the LED module  11  to reflect the light to anywhere needs illumination of the LED module  11 , without redesign of the LED lamp. 
     It is to be understood, however, that even though numerous characteristics and advantages of the disclosure have been set forth in the foregoing description, together with details of the structure and function of the embodiments, the disclosure is illustrative only, and changes may be made in detail, especially 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.