Patent Publication Number: US-9423099-B2

Title: LED lamp having reflector with high heat dissipation rate

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to a lamp, and more particularly to a lamp having a reflector with high heat dissipation rate. 
     2. Description of the Related Art 
     The luminous efficiency of light emitting diodes (LED) makes largely progress due to improvement of material and technology. Because the luminance of LED is comparable to conventional illuminating devices and LEDs has light weight and long service life, the conventional bulbs are replaced by LEDs. 
     LEDs are broadly applied to various lamps such as commercial lamps or household lamps. The high power LEDs with high luminance are the first choice of light emitting elements for various lamps. However, the high power LEDs generate high heat which may reduce the service life and performance. Thus, heat dissipation solution become important for lamps using high power LEDs. 
     Conventional heat dissipation technology for lamps utilizes heat dissipation structure disposed around LEDs to prevent heat from affecting lamps. The heat dissipation structure conducts heat out of the lamps rapidly by means of its highly thermal conductive material. However for wall mounting type lamps or hanging lamps, the design of the heat dissipation structure is limited for the lamp structure and may have a poor heat dissipation effect. 
     BRIEF SUMMARY OF THE INVENTION 
     The invention provides a lamp reflector with high heat dissipation rate, wherein several heat sinks are directly disposed on a body of the lamp reflector, and several light emitting modules are directly disposed on the heat sinks to facilitate heat dissipation so as to promote luminous efficiency and extend service life. 
     The lamp reflector with high heat dissipation rate in accordance with an exemplary embodiment of the invention includes a body including a plurality of sheets; a plurality of heat sinks connecting the sheets to form a corn shape; and a plurality of light emitting modules disposed on a surface of the heat sink in such a manner that the light emitting modules face an inner space of the body, wherein each of the light emitting modules includes: a substrate fixed to the surface; and a plurality of light emitting diodes disposed on the substrate and electrically connected to each other by the substrate. 
     A detailed description is given in the following embodiments with reference to the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein: 
         FIG. 1  is a perspective exploded view of an embodiment of a reflector of the invention; 
         FIG. 2  is a perspective view of an embodiment of a reflector of the invention; 
         FIG. 3  is a cross section of an embodiment of a reflector of the invention; 
         FIG. 4  is a cross section of an embodiment of a lamp of the invention; 
         FIG. 5  is a cross section of another embodiment of a lamp of the invention; and 
         FIG. 6  is a perspective exploded view of another embodiment of a reflector of the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The following description is of the best-contemplated mode of carrying out the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims. 
     Referring to  FIG. 1 , a reflector of the invention includes a body  1  including a plurality of sheets  11 . In  FIG. 6 , another embodiment of a reflector of the invention includes only one sheet  11 . The sheets  11  are assembled to form a corn shape. The body  1  has an opening formed at top and bottom thereof. A heat sink  2  is disposed between two adjacent sheets  11 . In  FIG. 6 , two lateral sides of the sheet  11  are connected to the heat sink  2 . Referring to  FIG. 1  again, each heat sink  2  has two lateral sides. A groove  21  is formed on each lateral side of the heat sink  2  respectively. The grooves  21  receive the lateral side of the sheet  11  to join the heat sinks  2  to each sheet  11 . A plurality of fins  22  are disposed on a surface of the heat sink  2 . A light emitting module  3  is disposed on another surface of each heat sink  2 . The light emitting module  3  faces an inner space enclosed by the body  1 . The light emitting module  3  includes a substrate  31 . In this embodiment, the substrate  31  is a circuit board. Two screw holes  311  are formed near two edges of the heat sink  2  for bolts  4  securing the substrate  31  to the heat sink  2 . A plurality of LEDs  32  are disposed on the substrate  31 . The LEDs  32  are electrically connected to each other by the substrate  31 . The substrate  31  is electrically connected to a lead  33  for each light emitting module  3  electrically connected to a power supply to emit light as shown in  FIG. 3 . Heat generated by the LEDs  32  is conducted to the heat sink  2  through the substrate  31  and further transfers to air through the fins  22  disposed on the heat sink  2 , whereby the heat is avoided to accumulate on the LEDs  32 .  FIG. 2  shows the assembly of the reflector. 
     Referring to  FIG. 4 , the reflector of the invention is hung in a room. A top of the body  1  is connected to a circular plate  6  which is secured to an outer periphery of the top of the body  1  by several bolts  4 . A ring  63  is fixed to at the center of the circular plate  6  by a bolt  62 . The ring  63  is connected to a connecting member  64 . In this embodiment, the connecting member  64  is a wire. The connecting member  64  hangs the reflector in the air. The LEDs  32  emit light for illumination of the room. 
     Referring to  FIG. 5 , a rod  7  extends to the reflector, and several supporting arms  71  connecting the body  1  and the rod  7  to prop up the reflector. The LEDs  32  emit light for illumination of the room. 
     While the invention has been described by way of example and in terms of preferred embodiment, it is to be understood that the invention is not limited thereto. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.