Abstract:
An exemplary LED lamp includes a central member, lamp bodies, a solar panel transforming solar power to electric energy, and a supporting member supporting the solar panel over the central member. Each lamp body includes a housing and an LED module received in the housing. The housings of the lamp bodies have bottoms thereof mounted around the central member and have tops thereof extending upwardly and outwardly from the central member. Each of the housings defines an opening facing away from the central member. Light generated by the LED modules projects out of the lamp bodies through the openings. The solar panel provides the electric energy to the LED modules.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The disclosure generally relates to an LED lamp. 
         [0003]    2. Description of Related Art 
         [0004]    An LED lamp is a type of solid-state lighting that utilizes light-emitting diodes (LEDs) as a source of illumination. The LED lamp is intended to be a cost-effective yet high quality replacement for incandescent and fluorescent lamp because the LED has features of long-term reliability, environment friendliness and low power consumption. 
         [0005]    A typical LED lamp includes a number of LEDs, and most of the LEDs are driven at the same time, which results in a quick rise in temperature of the LED lamp. Generally, the LED lamp further includes a heat sink dissipating heat generated by the LEDs. All of the LEDs are attached to a planar surface of the heat sink. When the LED lamp works, the LEDs attached to the planar surface of the heat sink only form a flat light source, not a three-dimensional light source. In addition, the LED lamp is generally mounted on a lamp pole and extends towards a side of the lamp pole to only illuminate a region at the side of the lamp pole. Thus, the LED lamp fails to provide a three-dimensional lamplight that is suitable for a condition that needs even and large-scale light. 
         [0006]    What is needed, therefore, is an LED lamp which can overcome the above-mentioned limitations. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0007]    Many aspects of the present illuminating device can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present illuminating device. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
           [0008]      FIG. 1  is an isometric, assembled view of an LED lamp in accordance with a first embodiment of the disclosure, wherein the LED lamp is mounted on a lamp pole. 
           [0009]      FIG. 2  is an isometric, exploded view of the LED lamp and the lamp pole of  FIG. 1 . 
           [0010]      FIG. 3  is an isometric, exploded view of a lamp body of the LED lamp of  FIG. 2 . 
           [0011]      FIG. 4  is an isometric, assembled view of an LED lamp in accordance with a second embodiment of the disclosure and a lamp pole. 
       
    
    
     DETAILED DESCRIPTION 
       [0012]    Referring to  FIGS. 1-2 , an LED lamp  100  in accordance with a first embodiment is illustrated. The LED lamp  100  comprises a central member  10 , four lamp bodies  20  evenly attached to a circumference of the central member  10 , a supporting member  30  extending upwardly from a top of the central member  10 , a solar panel  40  supported by the supporting member  30 , and a sleeve  50  connected with a bottom portion of the central member  10 . The LED lamp  100  can be held at a predetermined position by a lamp pole  60 . 
         [0013]    The central member  10  is a hollow and prism-shaped box to receive related electronic components (not shown) including a storage battery, a charger and a controller therein. The central member  10  has a top end portion thereof tapering along a bottom-to-top direction to define a plurality of slantwise mounting surfaces  12  on a circumferential periphery thereof. Number of the mounting surfaces  12  is identical to that of the lamp bodies  20 . In this embodiment, the amount of the mounting surfaces  12  is four, and the amount of the lamp bodies  20  is also four. 
         [0014]    Referring also to  FIG. 3 , the lamp bodies  20  are attached to the mounting surfaces  12  of the central member  10  and extend upwardly and radially from corresponding mounting surfaces  12 . Each of the lamp bodies  20  comprises a housing  22 , a heat sink  24  secured to the housing  22 , an LED module  26  attached to the heat sink  24 , and an envelope  28  engaged with the housing  22  to cooperatively receive the heat sink  24  and the LED module  26  therein. The LED module  26  faces the envelope  28 . Light generated by the LED module  26  radiates out though the envelope  28 . The envelope  28  is made of transparent/translucent glass or plastic. 
         [0015]    The housing  22  gradually expands from bottom to top to form a spoon-shaped configuration. The housing  22  defines an opening  220  facing away from the central member  10 . A top of the housing  22  defines a receiving space (not labeled) to receive the heat sink  24  and the LED module  26  therein. A bottom of the housing  22  forms a mounting plate  222 . The housing  22  forms a plurality of parallel and spaced securing posts  226  at an inner wall of the top thereof. The mounting plates  222  are secured to the mounting surfaces  12  of the central member  10 . 
         [0016]    The heat sink  24  comprises a base  242  and a plurality of fins  244  extending perpendicularly from the base  242  towards the inner wall of the top of the housing  22 . The base  242  is rectangular. A hole  2420  is defined in each corner of the base  242 . The holes  2420  correspond to the securing posts  226  of the housing  22 . The fins  244  are parallel to and spaced from each other. 
         [0017]    The LED module  26  comprises a printed circuit board  262  and a plurality of LEDs  264  attached to the printed circuit board  262 . The printed circuit board  262  is rectangular. A size of the printed circuit board  262  is substantially identical to that of the base  242  of the heat sink  24 . A through hole  2620  is defined in each corner of the printed circuit board  262 , corresponding to one of the holes  2420 . 
         [0018]    The envelope  28  is integrally formed of transparent or semitransparent materials such as glass or plastic. The envelope  28  expands upwards from bottom to top to fitly cover the opening  220  of the housing  22 . 
         [0019]    In assembly of each lamp body  20 , the corners of the heat sink  24  abut the securing posts  226  of the housing  22 , and the fins  244  are located between the base  242  of the heat sink  24  and the inner wall of the top of the housing  22 . The LED module  26  is attached to an outer surface of the base  242 . The holes  2420  in the base  242  align with the through holes  2620  in the printed circuit board  262 . Screws (not shown) extend sequentially through the through holes  2620  and the holes  2420 , and engage into the securing posts  226 , whereby the heat sink  24  and the LED module  26  are secured to the housing  22 . The LED module  26  is electrically connected with the storage battery received in the central member  10  via a wire  300 . 
         [0020]    The supporting member  30  is secured to a top surface  14  of the central member  10 , and extends upwardly from the top surface  14  of the central member  10  to support the solar panel  40  over the central member  10 . The supporting member  30  comprises a bottom base  32 , a shaft  34  extending perpendicularly and upwardly from the bottom base  32 , and a supporting board  36  engaged with a top of the shaft  34 . The top of the shaft  34  connects with a middle portion of the supporting board  36 . The bottom base  32  has a rectangular configuration. A size of the bottom base  32  is substantially identical to that of the top surface  14  of the central member  10 . The supporting board  36  is slantwise with respect to the shaft  34  whereby the solar panel  40  conformably secured on the supporting board  36  is also slantwise with respect to the shaft  34 ; thus, the solar panel  40  is able to collect more solar energy. 
         [0021]    The sleeve  50  has a top end thereof secured on a bottom of the central member  10 . The sleeve  50  has a bottom portion thereof fittingly receiving a top of the lamp pole  60  therein, whereby the LED lamp  100  is securely mounted on the lamp pole  60 . 
         [0022]    The lamp bodies  20  have bottom portions thereof mounted to the mounting surfaces  12  of the central member  10 , to make the lamp bodies  20  be located around the central member  10 . The lamp bodies  20  have top portions thereof facing different directions which are perpendicular to each other around a circumferential periphery of the central member  10 ; thus, the light generated by the LED modules  26  of the lamp bodies  20  illuminates a region around the lamp pole  60  to form a round light field around the lamp pole  60 . 
         [0023]    In use of the LED lamp  100 , the solar panel  40  collects and stores solar power and transforms the solar power to electric energy. The electric energy is stored in the storage battery in daytime. At night, the storage battery supplies electric energy for the LED modules  26 . Thus, the LED lamp  100  can work without an external power supply. In addition, the solar panel  40  shades the lamp bodies  20  from the sun, thereby preventing the lamp bodies  20  from being damaged by the sun. Furthermore, heat generated by the LED modules  26  is absorbed by the bases  242  of the heat sinks  24  and is dissipated by the fins  244 , whereby the LED modules  26  are kept in a normal work condition. 
         [0024]    Referring also to  FIG. 4 , an LED lamp  200  in accordance with a second embodiment of the disclosure is shown. The LED lamp  200  is similar to the LED lamp  100  of the first embodiment. Different from the LED lamp  100 , the LED lamp  200  omits the supporting member  30  and the solar panel  40 . The electric energy needed by the LED lamp  200  is supplied by an external power supply. It is understood that the LED lamp  200  can further omit the lamp pole  60  and make the sleeve  50  be connected with a socket on the ground, thereby functioning as a lawn lamp. 
         [0025]    It is believed that the disclosure and its advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments of the invention.