Patent Publication Number: US-2013240920-A1

Title: Multi-direction bulb-type lamp

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a light emitting diode (LED) lamp holder, especially to a multi-directional lamp holder. 
     2. Description of Related Art 
     In recent, because technologies of light emitting diode (LED) have rapid development and gradually maturity, and LED has advantages of lower power consumption, long lifetime, small volume and lower responsive time, LED is widely used in all of lighting field. However, LED is a spot lighting with single light and the illumination range is very small, so that in the general use, it is usually combining multiple LEDs to form a LED lamp module for increasing illumination range and brightness, and for mixing different colors of light to form light in need. 
     Reference is made to  FIG. 1 , which is an exploded view of a related art LED lamp. The LED lamp  1 ′ includes a circuit board  10 ′, a plurality of LED elements  20 ′, and a housing  30 ′. The LED elements  20 ′ arranged in a matrix manner are positioned on the circuit board  10 ′, and the circuit board  10 ′ is combined to the housing  30 .′ The LED lamp  1 ′ emits light toward only one direction. In order to reach an illuminant effect of full-angle (multi-directions), the housing  30 ′ may be combined with multiple divided circuit boards  10 ′, and the circuit boards  10 ′ are positioned in multiple directions to fulfill a lamp with full angle illumination. 
     Through the LED lamp  1 ′ mentioned above can achieve multi-directional illumination, the assembly is time-cost. Besides, the LED elements  20 ′ are fixed to the circuit board  10 ′ by lead frame combination which causes higher thermal resistance, larger spacing limitation, and high cost. Furthermore, the illumination of the LED elements  20 ′ isn&#39;t uniform because the LED elements  20 ′ are disposed on different circuit boards  10 ′ with lead frame. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide a multi-directional bulb-type lamp which can be simplified for easy assembly, and reach multi-directional lighting. 
     It is another object of the present invention to provide a multi-directional bulb-type lamp to reach low thermal resistance, smaller spacing limitation, and with uniform illuminant effect. 
     Accordingly, the multi-directional bulb-type lamp according to one aspect of the present invention comprises a carrying body, a flexible substrate and a plurality of LED dies. The flexible substrate is a substrate extending toward multi-directions. The flexible substrate is attached to the carrying body along the surface of the carrying body. The LED dies are directly disposed on the flexible substrate and electrically connected to the flexible substrate. 
     Compare to the related art, the bulb-type lamp of the present invention includes a carrying body and a flexible substrate, the flexible substrate extending toward multi-directions and attached to the carrying body along a surface thereof. Wherein, the carrying body may be ball-shape or polyhedron, and the flexible substrate includes a central disposing area and a plurality of lateral disposing areas. The lateral disposing areas may be bar-shape or other configuration can attached to the surface of the carrying body and reach the illuminant effect of multi-directional. Besides, the LED dies of the bulb-type lamp of the present invention are disposed on the same flexible substrate without lead frame, thus can reduce color difference mentioned in the related art, and reach uniform colors, reduce the difficulty of assembling different circuit board, and increase utility. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The features of the invention believed to be novel are set forth with particularity in the appended claims. The invention itself however may be best understood by reference to the following detailed description of the invention, which describes certain exemplary embodiments of the invention, taken in conjunction with the accompanying drawings in which: 
         FIG. 1  is a related art LED bulb-type lamp. 
         FIG. 2  is a cross sectional view of a multi-directional bulb-type lamp according to a first embodiment of the present invention. 
         FIG. 3  is an exploded perspective view of the multi-directional bulb-type lamp according to the first embodiment of the present invention. 
         FIG. 4  is an assembly view of the multi-directional bulb-type lamp according to the first embodiment of the present invention 
         FIG. 5  is a schematic view of the arrangement of the LED dies according to the first embodiment of the present invention. 
         FIG. 6  is a cross sectional view of the combination of the LED dies and the flexible substrate according to a second embodiment of the present invention. 
         FIG. 7  is a cross sectional view of the combination of the LED dies and the flexible substrate according to a third embodiment of the present invention. 
         FIG. 8  is a cross sectional view of the combination of the LED dies and the flexible substrate according to a forth embodiment of the present invention. 
         FIG. 9  is a planer view of a flexible substrate according to a second embodiment of the present invention. 
         FIG. 10  is an assemble view of the flexible substrate and a carrying body according to the second embodiment of the present invention. 
         FIG. 11  is a planar view of a flexible substrate according to a third embodiment of the present invention. 
         FIG. 12  is an assembly view of the flexible substrate and a carrying body according to the third embodiment of the present invention. 
         FIG. 13  is a planer view of a flexible substrate according to a forth embodiment of the present invention. 
         FIG. 14  is an assembly view of the flexible substrate and a carrying body according the forth embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. 
     Referenced is made to  FIG. 2 ,  FIG. 3  and  FIG. 4 .  FIG. 2  is a cross sectional view of a multi-directional bulb-type lamp according to a first embodiment of the present invention,  FIG. 3  is exploded perspective of the multi-directional bulb-type lamp according to the first embodiment of the present invention, and  FIG. 4  is an assembly view of the multi-directional bulb-type lamp according to the first embodiment of the present invention. The multi-directional bulb-type lamp  1  includes a carrying body  10 , a flexible substrate  20 , a plurality of light emitting diode (LED) dies  30 , a heat dissipating body  40  and a bulb base  50 . The carrying body  10  and the heat dissipating body  40  can be made of the same material and in one-piece form. 
     The carrying body  10  is made of material with heat conduction, and may be solid body or shelly body. In this embodiment, the carrying body  10  is substantially of ball-shape and has a spherical surface  11 , so that the flexible substrate  20  can attach to the carrying body  10  along the spherical surface  11 . 
     The flexible substrate  20  is a substrate extending toward multiple directions, and attached to the carrying body  10  along the surface of the carrying body  10 . The flexible substrate  20  may be a flexible printed circuit board (FPC), a chip on flex (COF) tape or other substrate with flexibility. The flexible substrate  20  includes a central disposing area  21  and a plurality of lateral disposing areas  22  extending outwardly from the central disposing area  21 . In this embodiment, each lateral disposing area  22  is of bar-shape. In addition, the lateral disposing areas  22  are spaced from each other and arranged in a radial manner. 
     The LED dies  30  are directly disposed on the flexible substrate  20 , and electrically connected to the flexible substrate  20  by wire bonding or die bonding. The heat dissipating body  40  is physically connected to the carrying body  10  for dissipating heat generated by the flexible substrate  20  and the LED dies  30 . In addition, the carrying body  10  is physically connected to the bulb base  50 , and an isolated pad  90  is disposed between the bulb base  50  and the heat dissipating body  40 , thus completing the assemble of the multi-directional bulb-type lamp. 
     Referred is made to  FIG. 5 , which is a schematic view of the arrangement of the LED dies according to the first embodiment of the present invention. The LED dies  30  are directly disposed on the flexible substrate  20 . The LED dies  30  may only have single color or have two or more different colors. For example, the LED dies  30  include two or more LED dies  30  with red color R, green color G and blue color B. A color which is in need will be generated by mixing lights generated by the LED dies  30 . 
     Referred is made to  FIG. 6  to  FIG. 8 , which are cross sectional views for the combination of the LED dies and flexible substrate in accordance with some embodiments of the present invention. The multi-directional bulb-type lamp  10  further includes a first light transmitting layer  70  and a second light transmitting layer  60 . The first light transmitting layer  70  and the second light transmitting layer  60  may further include a wavelength converting material. The wavelength converting material may be mixed into the first light transmitting layer  70  or the second light transmitting layer  60 , or coated on an external surface of the first light transmitting layer  70 . The wavelength converting material may be phosphor, quantum well film or quantum dot phosphor. 
     The first light transmitting layer  70  and the second light transmitting layer  60  are made of PMMA, PC, PP, epoxy, silicone, glass and other material with light transparency. The first light transmitting layer  70  diffuses light generated by the LED dies  30  and uniformly mixes lights generated by the LED dies  30 . 
       FIG. 6  shows the combination of the LED dies and the flexible substrate according to a second embodiment of the present invention. Each LED die  30  is covered with the second light transmitting layer  60 , and the LED dies  30  are arranged in unequal intervals. However, the above arrangement is only exemplary, and other arrangements are within the scope of the present disclosure. In addition, the first light transmitting layer  70  is physically connected to the heat dissipating body  40  and covers the LED dies  30 . 
       FIG. 7  shows the combination of the LED dies and the flexible substrate according to a third embodiment of the present invention. This embodiment is similar to that of embodiment shown in the  FIG. 6 , and the different is that the multi-directional bulb-type lamp  1  further includes a wavelength converting layer  80 . The wavelength converting layer  80  is combined with the first light transmitting layer  70  for converting light generated by the LED dies  30  into another light with color different from the original color. In this embodiment, the wavelength converting layer  80  is combined with an internal surface of the first transmitting layer  70 . In addition, another difference between  FIG. 6  and  FIG. 7  is that the second light transmitting layer  60   a  covers the LED dies  30  integrally. 
       FIG. 8  shows the combination of the LED dies and the flexible substrate according to a forth embodiment of the present invention. This embodiment is similar to that of embodiment shown in the  FIG. 6 , and the different is that the LED dies  30   a  is electrically connected to the flexible substrate  20  by wire bonding, and the first light transmitting layer  70   a  further includes a wavelength converting material. 
     Referenced is made to  FIG. 9  and  FIG. 10 ,  FIG. 9  is a planer view of a flexible substrate according to a second embodiment of the present invention, and  FIG. 10  is an assemble view of the flexible substrate and a carrying body according to the second embodiment of the present invention. In this embodiment, the flexible substrate  20   a  includes a central disposing area  21   a  and a plurality of lateral disposing areas  22   a  extending outwardly from the central disposing area  21   a . The lateral disposing areas  22   a  are spaced from each other and arranged in a radial manner. The flexible substrate  20   a  is similar to that of first embodiment mentioned above, and the different is that the lateral disposing area  22   a  includes a front section  221   a  extending from the central disposing area  21   a , a middle section  222   a  connected with the front section  221   a  and a back section  223   a  connected to the middle section  222   a . The configuration of the lateral disposing area  22   a  is gradually broadened from the front section  221   a  to the middle section  222   a , and is gradually straitened form the middle section  222   a  to the back section  223   a . Besides, a plurality of LED dies  30  are disposed on the flexible substrate  20   a . The lateral disposing areas  22   a  are attached to the surface of carrying body  10   a  after the central disposing area  21   a  is disposed on the top of the carrying body  10   a , so that the flexible substrate  20   a  is attached to the external surface of the carrying body  10   a  and lamp achieves multi-directionally illuminant effect. In addition, different sections may dispose different amount of LED dies  30   a  for controlling lighting amount and colors in different directions. 
     Referenced is made to  FIG. 11  and  FIG. 12 ,  FIG. 11  is a planar view of a flexible substrate according to a third embodiment of the present invention, and  FIG. 12  is an assembly view of the flexible substrate and a carrying body according to the third embodiment of the present invention. In this embodiment, the flexible substrate  20   b  includes a central disposing area  21   b  and a plurality of lateral disposing areas  22   b  extending outwardly from the central disposing area  21   b . The flexible substrate  20   b  is similar to that of first embodiment mentioned above, and the different is that the central disposing area  21   b  is of rectangular-shape, each lateral disposing area  22   b  is extending outwardly from a side of the central disposing area  21   b  and of trapezoid-shape, and the carrying body  10   b  is a tetragon pillar. The central disposing area  21   b  is orientated on a top surface of the carrying body  10   b  after disposing a plurality of LED dies  30   b  on the central disposing area  21   b  and the lateral disposing areas  22   b , and then the lateral disposing areas  22   b  are respectively attached to side-surfaces of the carrying body  22   b , so that the lamp can achieve multi-directionally illuminant effect. 
     Referenced is made to  FIG. 13  and  FIG. 14 ,  FIG. 13  is a planer view of a flexible substrate according to a forth embodiment of the present invention, and  FIG. 14  is an assembly view of the flexible substrate and a carrying body according the forth embodiment of the present invention. In this embodiment, the flexible substrate  20   c  includes a central disposing area  21   c  and a plurality of lateral disposing areas  22   c  extending outwardly from the central disposing area  21   c . The flexible substrate  20   c  is similar to that of first embodiment mentioned above, and the different is that the central disposing area  21   c  is of rectangular-shape, and each lateral disposing area  22   c  includes a front section  221   c  extending from the central disposing area  21   c , a middle section  222   c  connected with the front section  221   c  and a back section  223   c  connected to the middle section  222   c . In more particularly, the front section  221   c  is a section with trapezoid-shape, the middle section  222   c  is a section with rectangular-shape, and the back section  223   c  is another section with trapezoid-shape and symmetrical to the front section  221   c . In addition, the carrying body  10   c  is a polyhedron. After disposing the LED dies  30   c  on the flexible substrate  20   c , such that the central disposing area  21   c  and the lateral disposing areas  22   c  (including the front section  221   c , middle section  222   c  and back section  223   c ) are attached to the surfaces of the carrying body  10   c , and then multi-directionally (or multi-angles) illuminant effect can be achieved. 
     Although the present invention has been described with reference to the preferred embodiment thereof, it will be understood that the invention is not limited to the details thereof. Various substitutions and modifications have suggested in the foregoing description, and other will occur to those of ordinary skill in the art. Therefore, all such substitutions and modifications are intended to be embraced within the scope of the invention as defined in the appended claims.