Patent Publication Number: US-8534884-B2

Title: Light emitting diode bulb

Description:
BACKGROUND 
     1. Technical Field 
     The disclosure relates to a light emitting diode (LED) bulb, and particularly to an LED bulb providing an adjustable illumination area. 
     2. Description of the Related Art 
     A light bulb has a variety of applications and is suitable for use as a ceiling light or a wall light, etc. The light bulb is generally mounted on a lamp socket. The light bulb has a fixed illumination angle and cannot be adjusted whereby the application of the light bulb is limited. 
     What is needed, therefore, is a light bulb, particularly, an LED bulb having an adjustable illumination angle. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Many aspects of the disclosure can be better understood with reference to the following drawing. The components in the drawing are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present light emitting diode package for microminiaturization. Moreover, in the drawing, like reference numerals designate corresponding parts throughout the whole view. 
         FIG. 1  is a schematic, isometric, assembled view of an LED bulb in accordance with an exemplary embodiment. 
         FIG. 2  is an exploded view of the LED bulb of  FIG. 1 . 
         FIG. 3  is an inverted view of the LED bulb of  FIG. 2 . 
         FIG. 4  is similar to  FIG. 1 , but showing the LED bulb in another position. 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made to the drawing figures to describe the present electronic device in detail. 
     Referring to  FIG. 1 , an LED bulb  100  according to the present disclose includes a lamp seat  10 , a rotatable member  16  rotatably connecting to the lamp seat  10 , two holders  18  fixedly mounted on the rotatable member  16  and a lamp head  30  pivotably connecting with the holders  18 . 
     Referring to  FIGS. 2 and 3 , the lamp seat  10  includes an electrical connector  12  and a casing  14  extending from the electrical connector  12 . The electrical connector  12  is used for connecting a socket of an outer power supply for providing electricity to the LED bulb  100 . The electrical connector  12  can be a standard connector, for example, an Edison holder such as E27, etc., for facilitating the connection of the LED bulb  100  with an existed socket. 
     The casing  14  is made of electrically insulating material. The casing  14  has a funneled shape and includes a small end  140  connecting with the electrical connector  12 , a large end  144 , and a collar  142  interconnecting the small end  140  and the large end  144 . The conical collar  142  receives a driving module (not shown) therein to connect the electrical connector  12  with the lamp head  30 . A diameter of the conical collar  142  gradually enlarges from the small end  140  to the large end  144 . The large end  144  has an annular shape. The larger end  144  defines two arced recesses  145  in an inner wall thereof. The arced recesses  145  are in a same circle and face each other. 
     The rotatable member  16  includes a circular plate  160 , an annular sidewall  162  and two locking portions  164 . The plate  160  defines a central hole  161  for extension of wires (not shown) of the LED bulb  100 , wherein the wires are used for electrically connecting the connector  12  and the lamp head  30 . The sidewall  162  extends up from a periphery of the plate  160 , and defines two opposite securing holes  163  therein. The locking portions  164  extend upwards from a top edge of the sidewall  162  and separate from each other. Each of the locking portions  164  includes an arced elastic arm  165  extending upwards from the sidewall  162  and an arced engaging portion  166  protruding outwards from a top edge of the elastic arm  165 . Each of the engaging portions  166  has an engaging surface  167  gradually slanting downwards and outwards, as viewed from  FIG. 2 . In assembly of the casing  14  and the rotatable member  16 , the locking portions  164  are elastically inserted into the larger end  144  of the casing  14  with the engaging portions  166  received in the recesses  145 ; thus, the rotatable member  16  can be rotated around a first axis  80  of the large end  144  of the casing  14  clockwise or anticlockwise. The first axis  80  extends through a center of the casing  14 . 
     In this embodiment, an arced length of each engaging portion  166  is less than an arced length of each circumferential recess  145 . The arced length of each engaging portion  166  is slightly less than one quarter of a circumference of the large end  144  of the casing  14 . The circumferential recesses  145  are disconnected to each other. The arced length of each circumferential recess  145  is slightly less than a half of the circumference of the large end  144  of the casing  14 . Thereby, the rotatable member  16  can rotate from 0 degrees to about 90 degrees relative to the casing  14 . Alternatively, in another embodiment, an amount of the locking portions  164  can be one or more than two, and the circumferential recesses  145  can communicate with each other to form a continuously circular recess, whereby the rotatable member  16  can rotate relative to the casing  14  around the first axis  80  from 0 degrees to 360 degrees in a horizontal plane. 
     The holders  18  are mounted at two opposite sides of the rotatable member  16 . Each of the holders  18  includes a mounting portion  180  and a support arm  182  extending downwards from the mounting portion  180 . Each of the mounting portions  180  is an arced sheet corresponding to an outer surface of the rotatable member  16 . Each of the mounting portions  180  defines a through hole  181  corresponding the securing hole  163 . The holders  18  are mounted on the rotatable member  16  by fasteners  60  with washers  70 , wherein the fasteners  60  extend through the washers  70  and the through holes  181  to engage in the securing holes  163 . Each of the support arms  182  defines a pivot hole  183  at a bottom end thereof. Alternatively, the holder members  18  can be integrally formed with the rotatable member  16  as one piece. 
     The lamp head  30  includes a heat sink  32 , a light module  36  mounted at a bottom of the heat sink  32  and an envelope  34  engaging on the heat sink  32  and covering the light module  36 . The heat sink  32  includes a base  320  and two ears  324  extending from two sides of the base  320 . A plurality of heat-dissipating rods  322  are formed on a top face of the base  320  as viewed from  FIG. 2 . The ears  324  define mounting holes  325  in alignment with the pivot holes  183  of the support arms  182 . The light module  36  is an LED module including a plurality of LEDs. The lamp head  30  is pivotably engaged with the holders  18  by fasteners  60  extending through the pivot holes  183  and engaging in the mounting holes  325 . Thereby, the lamp head  30  can be turned around the fasteners  60  in 360 degrees around a second axis  90  of the holders  18 . The second axis  90  is perpendicular to the first axis  80 . 
     In use, the lamp head  30  is rotatable relative to the lamp seat  10  via rotation of the rotatable member  16  or the lamp head  30 . According to different requirements of illumination area, the lamp head  30  can be adjusted to a suitable aspect relative to the lamp seat  10  and fixed in position by tightening the fasteners  60  in the mounting holes  325 . 
     It is to be further understood that even though numerous characteristics and advantages have been set forth in the foregoing description of embodiments, together with details of the structures and functions of the embodiments, the disclosure is illustrative only; and that 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.