Abstract:
A beam angle adjustable LED lamp has a simicircular and tubular heat-dissipating body, a light source module mounted on the heat-dissipating body to constitute a thermal contact therewith, a contact module pivotally mounted on one end of the heat-dissipating body, and a power converter mounted inside the heat-dissipating body and respectively and electrically connected with the light source module and the contact module. With the foregoing structure, a lighting direction of the light source module is perpendicular to an electrical connection path of the contact module and a lamp socket. As the contact module is pivotable relative to the heat-dissipating body, a beam angle of the light source on the heat-dissipating body can be adequately adjusted based on a lighting requirement.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a light-emitting diode (LED) lamp, and more particularly to an LED lamp capable of conveniently adjusting a lighting direction. 
         [0003]    2. Description of the Related Art 
         [0004]    In answer to the global pursuit of carbon reduction and energy conservation, light-emitting diode has become a dominant light source considered for lamps lately. In contrast to conventional light source, LED lamps remarkably differ in power specifications and driving means. Even so, in order to sufficiently utilize current resources, stimulate customers&#39; intention to replace conventional light sources and increase the applicable range of LED lamps, LED lamps tend to be designed and made compatible with conventional lighting equipment, for example, LED lamps having the forms of incandescent bulbs or fluorescent lamps, during a commercialization process of LED lamps. 
         [0005]    For one kind of LED lamps currently available in the market taking the form of a light bulb and having their ring contacts connected with the lamp sockets of the conventional incandescent lamps, the lighting angle of such an LED lamp may not be properly positioned as intended after the ring contact of the LED lamp is tightly screwed into the lamp socket due to the unmatched tolerances thereof. The deviated lighting angle simply leads to an unsatisfactory light effect. 
         [0006]    Besides, despite the advantages of low power consumption and long working cycle, heat generated by LED lamps using multiple LEDs to simultaneously illuminate must be tackled with an efficient heat-dissipating approach. Most LED lamps currently employ die-casting parts for heat dissipation. However, the die-casting parts are implemented with higher cost. Additionally, LED lamps with different power consumption need to have corresponding heat-dissipating requirements. In other words, die-casted heat-dissipating parts with different specifications must be prepared to comply with the power consumption requirements of the LED lamps, and such necessity significantly increases the cost of the LED lamps. 
       SUMMARY OF THE INVENTION 
       [0007]    An objective of the present invention is to provide a beam angle adjustable LED lamp capable of conveniently adjusting a lighting direction. 
         [0008]    To achieve the foregoing objective, the beam angle adjustable LED lamp has a heat-dissipating body, a light source module, a contact module and a power converter. 
         [0009]    The heat-dissipating body is tubular and composed of an extrusion, and has a platform and a chamber. The platform is formed on a periphery of the heat-dissipating body and has a surface. The chamber is defined by the heat-dissipating body and located under the platform. 
         [0010]    The light source module is mounted on the platform of the heat-dissipating body to constitute a thermal contact with the surface of the platform. 
         [0011]    The contact module has an insulation base and a ring contact. The insulation base is pivotally mounted on one end of the heat-dissipating body. The ring contact is mounted around the insulation base. 
         [0012]    The power converter is mounted inside the chamber of the heat-dissipating body, and has one set of input wires and one set of output wires. The set of input wires is electrically connected to the ring contact. The set of output wires is electrically connected to the light source module. 
         [0013]    In the foregoing structure a lighting direction of the light source module is approximately perpendicular to the contact module. As the contact module is pivotable relative to the heat-dissipating body, a beam angle of the light source on the heat-dissipating body is not affected by the tolerance or tightness between the LED lamp and a lamp socket, and can be adequately adjusted based on a lighting requirement. 
         [0014]    Another objective of the present invention is to provide an LED lamp commensurate with different heat-dissipating requirements. The LED lamp employs a heat-dissipating body composed of extruded aluminum. When the LED lamp has higher power consumption, the LED lamp just needs to increase the length of the heat-dissipating body to obtain more heat-dissipating area and satisfy the heat-dissipating requirements under different power consumption. 
         [0015]    Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0016]      FIG. 1  is a perspective view of a beam angle adjustable LED lamp in accordance with the present invention; 
           [0017]      FIG. 2  is an exploded perspective view of the beam angle adjustable LED lamp in  FIG. 1 ; 
           [0018]      FIG. 3  is a side view in partial section of the beam angle adjustable LED lamp in  FIG. 1 ; 
           [0019]      FIG. 4  is a front view in partial section of the beam angle adjustable LED lamp in  FIG. 1 ; and 
           [0020]      FIG. 5  is an exploded perspective view of another embodiment of the light source module and extruded heat-dissipating body of the beam angle adjustable LED lamp in  FIG. 1 . 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0021]    With reference to  FIGS. 1 and 2 , a beam angle adjustable LED lamp in accordance with the present invention has a heat-dissipating body  10 , a light source module  20 , a contact module  30  and a power converter  40 , a lamp shade  50 , a first fixing member  51  and a second fixing member  52 . 
         [0022]    The heat-dissipating body  10  is composed of an extrusion by a continuous extrusion process. After a length of extruded aluminum constituting the heat-dissipating body  10  is extruded, the heat-dissipating body  10  is cut to a preset length based on an actual power requirement of the LED lamp. 
         [0023]    In the present embodiment, the heat-dissipating body  10  is tubular, and has a semicircular section, multiple fins  11 , two notches  12 , a platform  13 , a chamber  14 , a stop bar  15 , two guide strips  16  and at least one positioning hole  17 . The fins  11  are oppositely and longitudinally formed on and transversely protrude from a semicylindrical periphery of the heat-dissipating body  10  so as to increase a heat-dissipating area. The two notches  12  are oppositely and longitudinally formed in inner portions of the fins  11 . The platform  13  is formed on a periphery of the heat-dissipating body  10 , and has a cavity  131  and an opening  132 . The cavity  131  is formed on and recessed inwardly from a first end of the platform  13 . The opening  132  is formed through an opposite second end of the platform  13 , is T-shaped, and has a transverse slot and a longitudinal slot. One end of the longitudinal slot communicates with the transverse slot, and the other end is formed through an edge of the second end of the platform  13 . The chamber  14  is defined inside the heat-dissipating body  10  for accommodating the power converter  40 . The stop bar  15  is longitudinally formed on and protrudes from a bottom of an inner wall of the heat-dissipating body  10 , and has a through hole  150  longitudinally formed through the stop bar  15  for fixing the first fixing member  51 . The guide strips  16  are respectively and longitudinally formed on two sides of the platform  13  along the transverse direction, and have two channels  160  respectively and longitudinally formed in two opposite sidewalls of the guide strips  16  for engaging the lamp shade  50 . The at least one positioning hole  17  is formed through the platform  13  and adjacent to the opening  132  for fixing the second fixing member  52 . 
         [0024]    The light source module  20  has a circuit board  21  and multiple LEDs  22 . The circuit board  21  is elongated and mounted on the platform  13  of the heat-dissipating body  10  to constitute a thermal contact with a surface of the platform  13 . The LEDs  22  are mounted on the circuit board  21 . When the light source module  20  is operating, heat generated from the circuit board  21  is conducted to the platform  13  and radiated to the air through the semicylindrical periphery of the heat-dissipating body  10  and the fins  11  on the heat-dissipating body  10 . An operating power of the light source module  20  is supplied by the power converter  40 . 
         [0025]    The power converter  40  has one set of input wires  41  and one set of output wires  42 . The set of output wires  42  is electrically connected with the circuit board  21  of the light source module  20  through the cavity  131  of the platform  13 . The set of output wires  42  is electrically connected with the contact module  30 . 
         [0026]    The contact module  30  has an insulation base  31  and a ring contact  32 . The insulation base  31  has a cylinder, a neck  311 , a ring  312  and a wire hole  314 . The cylinder is formed on an end face of an outer side of the insulation base  31 , and has an outer diameter corresponding to that of the ring contact  32  for the ring contact  32  to be mounted around the cylinder. The neck  311  and the ring  312  are coaxially formed on and protrude inwardly from an end face of an inner side of the insulation base  31 . The outer diameter of the ring  312  is greater than that of the neck  311 . The outer diameters of the neck  311  and the ring  312  respectively correspond to widths of the longitudinal slot and the transverse slot of the opening  132  on the platform  13  along the transverse direction so that the neck  311  and the ring  312  of the insulation base  31  can be mounted through the opening  132  and rotatable in the opening  132 . With reference to  FIG. 3 , the ring  312  has a stop protrusion  313  formed on and protruding radially from a circumferential periphery of the ring  312 , and blocked by the stop bar  15  when the insulation base  31  is rotated, so as to limit a rotation angle of the insulation base  31 . Whether the insulation base  31  is rotated clockwise or counter-clockwise, the rotation angle of the insulation base  31  does not exceed 360 degrees. With reference to  FIG. 4 , the wire hole  314  is longitudinally formed through the insulation base  31  for the set of input wires  41  to be electrically connected with the ring contact  32  through the wire hole  314 . 
         [0027]    With reference to  FIGS. 2 and 3 , the lamp shade  50  takes the form of an arced sheet body, and has two channel clips  501  respectively and longitudinally formed on and protruding inwardly from two longitudinal edges of an inner wall of the lamp shade  50  and respectively corresponding to and clipped into the channels  160  of the guide strips  16 . 
         [0028]    After the lamp shade  50  is clipped on the heat-dissipating body  10 , the first fixing member  51  and the second fixing member  52  are securely mounted on two ends of the lamp shade  50  along the longitudinal direction. The first fixing member  51  is disc-shaped, and has an arced flange  511 , at least one insertion piece  512 , a fixing hole  513  and a bolt  514 . With reference to  FIG. 4 , the arced flange  511  is formed on and protrudes inwardly from a top circumference of the first fixing member  51 , and is mounted around one arced edge of the lamp shade  50 . The at least one insertion piece  512  is formed on an inner side of the first fixing member  51 . In the present embodiment, the first fixing member  51  has two insertion pieces  512  corresponding to and mounted in the two notches  12  of the heat-dissipating body  10 . The fixing hole  513  is formed through one semicircle of the first fixing member  51  not surrounded by the arced flange  511 , and corresponds to the through hole  150  of the stop bar  15  of the heat-dissipating body  10 . The bolt  514  is mounted through the fixing hole  513  and the through hole  150  of the stop bar  15  so as to fix the first fixing member  51  on one end of the heat-dissipating body  10  opposite to the contact module  30  and one end of the lamp shade  50 . 
         [0029]    The second fixing member  52  is mounted on the other end of the lamp shade  50 . In the present embodiment, the second fixing member  52  takes the form of an arcuate block, and has two fixing holes  521 , two bolts  522  and a limit block  523 . The fixing holes  521  are formed through an arced periphery of the second fixing member  52 , and respectively correspond to the positioning holes on the platform  13 . The bolts  522  are respectively screwed into the positioning holes  17  on the platform  13  through the fixing holes  521  so as to fix the second fixing member  52  on one end of the platform  13  opposite to the first fixing member  51 . An inner side of the second fixing member  52  abuts against the other end of the lamp shade  50 . The limit block  523  is arcuate, is formed on and protrudes inwardly from an arced side of the second fixing member  52 , corresponds to and is mounted around the neck  311  of the insulation base  31 , and abuts against an outer side of the ring  312 , so that the insulation base  31  can be pivotally mounted in the heat-dissipating body  10 . 
         [0030]    With the structure of the foregoing embodiment, the contact module  30  and the light source module  20  of the beam angle adjustable LED lamp can be easily pivoted relative to each other. After the beam angle adjustable LED lamp is mounted, the lighting angle thereof can still be adjusted to enhance a lighting efficiency of the LED lamp. On the other hand, as the heat-dissipating body  10  is made of extruded aluminum, the heat-dissipating bodies  10  having different lengths can be cut to meet corresponding heat-dissipating requirements. With reference to  FIG. 5 , a light source module  20 ′ having a different lighting specification is disclosed. The light source module  20 ′ has more LEDs  22 ′ mounted on a circuit board  21 ′ than the light source module  20  does in the foregoing embodiment. Under this circumstance, a heat-dissipating body  10 ′ that is longer than that in the foregoing embodiment is incorporated to increase a heat-dissipating area and a heat-dissipating efficiency of the heat-dissipating body  10 ′. Accordingly, in response to various heat-dissipating requirements, different heat-dissipating parts do not need to be die-casted beforehand, thereby effectively lowering the stocking pressure and the production cost of the LED lamp. 
         [0031]    Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only. Changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.