Patent Publication Number: US-8529076-B2

Title: LED lamp

Description:
BACKGROUND 
     1. Technical Field 
     The present disclosure relates to LED lamps, and particularly to an LED lamp being capable of adjusting illumination angles thereof. 
     2. Description of Related Art 
     LEDs have many advantages, such as high luminosity, low operational voltage, low power consumption, faster switching, long-term reliability, environmental friendliness for not having to use mercury (Hg), and high impact resistance, which have promoted LEDs to be widely used as light sources. 
     A conventional LED lamp includes an LED module mounted on a socket. Generally, the LED module is immovable relative to the socket. Thus, an illumination angle of the LED lamp is fixed and can not be adjusted easily to meet varied requirements of illumination. As such, the usage of the LED lamp is limited. 
     Accordingly, it is desirable to provide an LED lamp which can overcome the described limitations. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an assembled, perspective view of an LED lamp according to an embodiment of the present disclosure. 
         FIG. 2  is an exploded view of the LED lamp of  FIG. 1 . 
         FIG. 3  is an enlarged, isometric view of an LED module of the LED lamp of  FIG. 2 . 
     
    
    
     DETAILED DESCRIPTION 
     Referring to  FIG. 1 , an LED lamp of the present disclosure is shown. The LED lamp includes a container  10  and a plurality of LED modules  20  received in the container  10 . 
     The container  10  includes a cover  12 , a socket  13  below the cover  12  and a shell  11  between the cover  12  and the socket  13 . The shell  11  allows light to radiate therethrough to illuminate an environment. Preferably, the shell  11  is transparent and made of plastic or glass. 
     Referring also to  FIG. 2 , the cover  12  includes a rectangular top plate  121  and four sidewalls  123  perpendicularly extending from edges of the top plate  121  towards the socket  13 . Two through holes  125  are defined in the top plate  121  in order to fix the LED modules  20  in the container  10 . The LED modules  20  have a number of two. 
     The socket  13  includes a rectangular engaging portion  131  and four sidewalls  133  perpendicularly extending from edges of the engaging portion  131  towards the cover  12 . A central portion of the engaging portion  131  defines two recesses  134  aligned with the two through holes  125  in the top plate  12  of the cover  10 . Two adjusters  15  are respectively received in the recesses  134  for adjusting illumination angles of the LED modules  20 . In this embodiment, each adjuster  15  is a gear and rotatable relative to a corresponding recess  134  of the socket  13 . A through hole  151  is defined in a middle of the adjuster  15  for fixedly receiving a bottom end of a corresponding LED module  20  therein. 
     A power module  14  and a micro-computer processor  16  are received in the engaging portion  131 . A sensor  50  is mounted on a top surface of the engaging portion  131  to detect illumination and positions of the LED modules  20 . The LED modules  20 , the power module  14 , the micro-computer processor  16 , and the sensor  50  electrically connect to each other. 
     The shell  11  is a hollow cube and opposite ends thereof are respectively enclosed by the cover  12  and the socket  13 . 
     Referring also to  FIG. 3 , each LED module  20  includes a shaft  22 , a first connector  23  and a second connector  24  respectively engaging with opposite top and bottom ends of the shaft  22 , and two lighting members  25  located at opposite lateral sides of the shaft  22  and connecting with the first and second connectors  23 ,  24 . The shaft  22  is hollow and receives wires (not shown) therein, which are electrically connected with the two lighting members  25 . The first and second connectors  23 ,  24  are connected with the shaft  22 . 
     The first connector  23  is a hollow cylinder. A top end of the first connector  23  defines a recess  231  at a middle thereof. A signal receiver  40  (as shown in  FIG. 1 ) is received in the recess  231 . A plurality of slits  233  is defined at a bottom end of the first connector  23 . The slits  233  are spaced from each other with a predetermined distance therebetween. An inner diameter of the first connector  23  is larger than an outer diameter of the shaft  22 . 
     The second connector  24  includes an inner ring  241  and an outer ring  242  surrounding the inner ring  241 . The inner ring  241  and the outer ring  242  are hollow cylinders and rotatablely engage with each other. An outer diameter of the outer ring  242  is equal to or slightly smaller than an inner diameter of the recess  134  of the socket  13 . A pole  247  protrudes out from a bottom end of the outer ring  242 . A diameter of the pole  247  is equal to an inner diameter of the through hole  151  of the adjuster  15 . An inner diameter of the inner ring  241  is equal to or slightly larger than the outer diameter of the shaft  22 . An inner clip  243  is formed on a top end of the inner ring  242 . An outer clip  245  is formed on a top end of the outer ring  242 . The inner clip  243  or the outer clip  245  each includes two spaced claws each having a form of a tab. 
     Each lighting member  25  includes an elongated sheet  253  and a plurality of LEDs  251  mounted on one side of the sheet  253 . A printed circuit layer  255  is formed on the sheet  253  and electrically connects with the LEDs  251 . The other side of the sheet  253  is coated with a layer of lighting-reflecting material  257  to reflect light emitted from the LEDs  253 . The sheet  253  is shorter than the shaft  22 . 
     When the LED module  20  is assembled, a top end of the shaft  22  is inserted in the first connector  23 . The two lighting members  25  are arranged on the lateral sides of the shaft  22 . Inner sides of top ends of the sheets  253  are respectively inserted in two corresponding slits  233  of the first connector  23  to define a predetermined angle between the sheets  253 . The top ends of the sheets  253  abut against the first connector  23 . The inner ring  241  is rotatable relative to the outer ring  242 , whereby a relative position between the inner clip  243  and the outer clip  245  is adjustable. Inner sides of bottom ends of the sheets  253  are respectively inserted in the inner clip  243  and the outer clip  245  and abut against the inner ring  241  and the outer ring  242 . A bottom end of the shaft  22  is inserted in the inner ring  241 . In this state, the LED module  20  is assembled completely. Alternatively, the LED module  20  can have two second connectors  24  at the opposite top and bottom ends, whereby the first connector  23  is replaced by one of the second connectors  24 . 
     Referring to  FIGS. 1-2  again, when the LED lamp is assembled, the assembled LED modules  20  are mounted on the socket  13 . The second connecters  24  are respectively received in the recesses  134  of the socket  13  and the poles  247  of the second connectors  24  are respectively inserted in the through holes  151  of the adjusters  15  and firmly engage with the adjusters  15 . The shell  11  surrounds the LED modules  20  and the bottom end thereof engages with the socket  13 . The cover  12  covers the top end of the shell  11 . The first connectors  23  are respectively inserted in the through holes  125  of the cover  12  and the top ends thereof are located at an outside of the top plate  121  of the cover  12 . The two signal receivers  40  are respectively received in the recesses  231  of the first connectors  23 . In this state, the LED lamp is assembled completely. 
     When the illumination angle of the LED lamp is needed to be adjusted, a signal emitter  30  is used. The signal receivers  40  mounted on the first connectors  23  receive signals from the signal emitter  30 , and transmit the signals to the micro-computer processor  16 . The sensor  50  detects the illumination and the positions of the LED modules  20 , simultaneously, and emits a corresponding signal to the micro-computer processor  16 . The micro-computer processor  16  dictates the power module  14  to drive the adjusters  15  to rotate relative to the socket  13  according to the signals received from the receivers  40  and the sensor  50  by the micro-computer processor  16 . The LED modules  20  rotate with the poles  247 , following the rotation of the adjusters  15  until the LED modules  20  are located at the predetermined positions to obtain predetermined illumination. 
     It is to be understood, however, that even though numerous characteristics and advantages of the embodiments have been set forth in the foregoing description, together with details of the structures and functions 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.