Patent Publication Number: US-8523401-B2

Title: LED projecting lamp

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to an LED projecting lamp, particularly to one having the outer surface of a lamp cup coated with a radiating paint, and both the inner groove portion of the lamp cup and a fixing ring respectively bored with radiating convection holes. Thus, high heat produced by LEDs can quickly be dissipated by the radiating paint and through the radiating convection holes, able to prolong the service life of the LEDs. 
     2. Description of the Prior Art 
     A conventional LED lamp, as disclosed in a Taiwan patent, No. M 278827 and Titled “LED LIGHTING DEVICE”, is composed of a casing that is over 2 mm in thickness, a cover plate and a relay component. The cover plate is assembled at the opening end of the casing, while the relay component is installed at the rear end of the casing for connecting an electric source. After receiving the electric source that is connected by the relay component via a circuit board, the LEDs will be started to shine and the light emitted by the LEDs will be projected out through LED shades and simultaneously, the heat energy produced by the LEDs will be absorbed by the thick casing and then transmitted out of the casing to carry out heat exchange with air, thus enabling heat energy produced by the LEDs to be exhausted out for prolonging the service life of the LED lamp. Although the thick casing of the conventional LED lamp can function to absorb and dissipate heat energy, yet the thicker the casing is, the more heat energy the casing will absorb and as a result, the temperature in the interior of the LED lamp will become excessively high to quickly cause heat exhaustion, impossible to prolong the service life of the LED lamp. 
     SUMMARY OF THE INVENTION 
     The objective of this invention is to offer an LED projecting lamp, simple in structure, low in manufacturing cost, and able to prolong service life of LEDs, promoting universality of using LEDs that save electricity, conforming to green environmental protection and decreasing volume of carbon dioxide emission. 
     The LED projecting lamp in the present invention includes a lamp holder, a lamp cup and a circuit board, which are combined together by means of bolts. The lamp cup integrally made of aluminum alloy has its bottom wall formed with a combination recess to be combined with the combination circumference of the lamp holder, further having an inner groove portion bored with radiating convection holes and an outer surface coated with radiating paint. A fixing ring to be secured at the opening of the lamp cup is also bored with radiating convection holes. Thus, high temperature produced by the LEDs can quickly be dissipated by the radiating paint on the outer surface of the lamp cup and through the radiating convection holes of both the lamp cup and the fixing ring, able to retard heat exhaustion and prolong service life of the LEDs. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       This invention will be better understood by referring to the accompanying drawings, wherein: 
         FIG. 1  is an exploded perspective view of an LED projecting lamp in the present invention; 
         FIG. 2  is a partial exploded perspective view of the LED projecting lamp in the present invention; 
         FIG. 3  is an upper view of the LED projecting lamp in the present invention; 
         FIG. 4  is a cross-sectional view of the line A-A in  FIG. 3 ; and 
         FIG. 5  is a perspective view of the LED projecting lamp in the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     A preferred embodiment of an LED projecting lamp in the present invention, as shown in  FIGS. 1-4 , includes a lamp holder  1 , a lamp cup  2 , a circuit board  3 , a lampshade lens  4  and a fixing ring  5  as main components combined together. 
     The lamp holder  1  is provided thereon with an electric source module  10  having two conducting terminals  11  extending downward and protruding out of the lower side of the lamp holder  1  to be connected with an external electric source. The lamp holder  1  is formed with a combination circumference  12  having its interior secured with a plurality of bolt joints  13  respectively bored with a bolt hole for a bolt  130  to be screwed therein to combine the lamp holder  1  together with the lamp cup  2 . Further, the combination circumference  12  has its outer lower side provided with an annularly protruding edge  120  to serve as a reference point of combination of the lamp holder  1  with the lamp cup  2 . 
     The lamp cup  2  integrally made of aluminum alloy has a bottom wall  20  disposed with a combination recess  21  dented inward and upward from the bottom wall  20  and having an inner diameter matching with the outer diameter of the combination circumference  12  of the lamp holder  1 , as shown in  FIG. 2 . Thus, the combination recess  21  can be fitted around and combined with the combination circumference  12  of the lamp holder  1  for the purpose of shortening the distance d 1  between the LEDs  30  and the opening of the lamp cup  2  so as to enable the light of the LEDs  30  to be quickly concentrated and projected out. 
     The circuit board  3  receiving the LEDs  30  thereon is positioned at the inner side of the bottom wall  20  of the lamp cup  2  and firmly combined together with the lamp holder  1  and the lamp cup  2  by means of bolts  130 . 
     The lampshade lens  4  located over the circuit board  3  is bored with a plurality of LED holes  40  to receive the LEDs  30  therein for concentrating and projecting light of the LEDs  30 . The lampshade lens  4  is formed with an upper plane surface  41  to be pressed by the fixing ring  5  for restrictedly positioning the lampshade lens  4 . 
     Furthermore, the lamp cup  2  is bored with radiating convection holes  220  at the bottom of an inner groove portion  22  and has outer surface coated with radiating paint  23 . Thus, heat produced by the LEDs  30  can quickly be dissipated through the radiating convection holes  220  and by the radiating paint  23  for retarding heat exhaustion and prolonging service life of the LEDs  30 . 
     In addition, the lamp cup  2  has its opening formed with an opening circumference  24  having an outer side provided with a projecting circumference  240 . Thus, the fixing ring  5  can be positioned by the opening circumference  24  and the projecting circumference  240  and then firmly combined together with the lamp cup  2  by means of an adhesive, as shown in  FIGS. 3 and 4 . 
     The fixing ring  5  is bored with radiating convection holes  50  to cooperate with the radiating convection holes  220  at the bottom of the inner groove portion  22  of the lamp cup  2  for functioning together. When the LEDs  30  are started to shine and the light of the LEDs  30  is concentrated and projected out through the lampshade lens  4 , a part of high temperature produced by the LEDs  30  will be absorbed by the lamp cup  2  and dissipated via the radiating paint  23  of the lamp cup  2  and another part of the high temperature will be exhausted out of the lamp cup  2  from the inner groove portion  22  through the radiating convection holes  50  and  220  of both the fixing ring  5  and the lamp cup  2 . Specifically, the LED projecting lamp of this invention can completely exhaust out the heat energy produced by the LEDs  30  by means of the radiating paint and the radiating convection holes, able to lower outer circumferential temperature of the LEDs, retarding heat exhaustion and prolonging service life of the LEDs  30 . 
     To sum up, the LED projecting lamp of this invention has the following advantages. 
     1. The combination recess  21  dented inward and upward from the bottom wall  20  of the lamp cup  2  can shorten the distance d 1  between the LEDs  30  and the opening of the lamp cup  2  for elevating light projecting efficiency, increasing efficiency of light source for decreasing the number of LEDs to be provided and producing efficiency of nearness of light source for reducing power consumption. 
     2. The radiating paint  23  coated on the outer surface of the lamp cup  2  can function to dissipate heat, and the radiating convection holes  50  and  220  of both the fixing ring  5  and the lamp cup  2  are able to permit the heat source produced by the LEDs  30  quickly exhausted out of the lamp cup  2  from the inner groove portion  22 , prolonging the service life of the LEDs  30 , lowering the volume of carbon dioxide emissions, saving energy and conforming to green environmental protection, and hence letting the LED lamp of this invention extensively accepted by consumers. 
     While the preferred embodiment of the invention has been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention.