Abstract:
A circuit board for bearing a plurality of light emitting diodes includes a base and a bent portion. The bent portion extends and bends from a lateral periphery of the base. The base and the bent portion are integrally formed. An outer surface of the bent portion resists other component to embed and fix circuit board. This disclosure also discloses a light emitting diode lamp having the circuit board.

Description:
FIELD 
       [0001]    The subject matter herein generally relates to a circuit board and a lighting emitting diode (LED) lamp having the same. 
       BACKGROUND 
       [0002]    LEDs have low power consumption, high efficiency, quick reaction time, long lifetime, and the absence of toxic elements, such as mercury, during manufacturing. Due to those advantages, traditional light sources are gradually replaced by LEDs, and LED lamps are becoming increasingly popular. 
         [0003]    A conventional LED lamp includes a circuit board and a plurality of LEDS arranged on the circuit board. The circuit board is a flat plate made of a metal, such as aluminum, and engages a heat dissipation device to dissipate heat generated by the LEDS. The circuit board and the heat dissipation device are usually connected via screws, which leads to a high cost of manufacturing the LED lamp. Simultaneously, the circuit board is easily warped partially when the screws are mounted thereto, which leads to uneven distribution of heat generated by the LEDS on the aluminum circuit board, and thereby effects a heat dissipation efficiency of the LED lamp. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0004]    Implementations of the present technology will now be described, by way of example only, with reference to the attached figures. 
           [0005]      FIG. 1  is an isometric, assembled view of an LED lamp in accordance with a first exemplary embodiment of the present disclosure. 
           [0006]      FIG. 2  is an exploded, perspective view of the LED lamp of  FIG. 1 . 
           [0007]      FIG. 3  is an inverted view of the LED lamp of  FIG. 1 . 
           [0008]      FIG. 4  is a cross-sectional view of the LED lamp, as taken along line IV-IV of  FIG. 1 . 
           [0009]      FIG. 5  is an assembled view of a circuit board and a lamp housing in the LED lamp of  FIG. 1 . 
           [0010]      FIG. 6  is an assembled, isometric view of a circuit board and a lamp housing in an LED lamp in accordance with a second exemplary embodiment of the present disclosure. 
           [0011]      FIG. 7  is an assembled, isometric view of a circuit board and a lamp housing in an LED lamp in accordance with a third exemplary embodiment of the present disclosure. 
       
    
    
     DETAILED DESCRIPTION 
       [0012]    Referring to  FIGS. 1 to 5 , an LED lamp  100  in accordance with a first embodiment is provided. The LED lamp  100  includes a circuit board  10 , a plurality of LEDs  20  arranged on the circuit board  10 , an encapsulation layer  30  covering the LEDs  20 , and an orientation ring  40  surrounding the encapsulation layer  30 . 
         [0013]    The circuit board  10  includes a base  11  and a bent portion  12  extending outwardly and bending from a lateral periphery of the base  11 . In this embodiment, the circuit board  10  is an aluminum circuit board. Alternatively, the circuit board  10  can also be a fiberglass circuit board, a multiple layer multiplex circuit board, a flexible circuit board, a ceramic circuit board, or a plastic circuit board and, so on. 
         [0014]    The base  11  is circular. The base  11  includes a connecting portion  111  at a periphery thereof and a positioning portion  112  at a center thereof. The connecting portion  111  is annular. The positioning portion  112  is depressed from an inner edge of the connecting portion  111  to support the LEDS  20 . In this embodiment, the positioning portion  112  is circular. As shown in  FIG. 4 , a bottom surface of the positioning portion  112  is lower than a bottom surface of the connecting portion  111 . Alternatively, a shape of the positioning portion  112  can be rectangular, triangular, and so on. A shape of the connecting portion  111  can be configured according to the shape of the positioning portion  112 . 
         [0015]    The bent portion  12  includes a sidewall  13  extending downwardly from the base  11  and an engaging portion  14  located at a periphery of the sidewall  13 . The sidewall  13  integrally extends downwardly from an outer edge of the connecting portion  111 . A height of the sidewall  13  is greater than a depressed depth of the positioning portion  112 . The sidewall  13  is annular. In this embodiment, the sidewall  13  is perpendicular to the connecting portion  111 . The sidewall  13  and the bottom surface of the base  11  together define a recess  15 . 
         [0016]    A cross-section of the engaging portion  14  is “L” shaped. The engaging portion  14  includes a connecting section  141  and an extending section  142 . Specifically, the connecting section  141  extends horizontally from a bottom end of the sidewall  13 , that is the bottom end of the sidewall  13  connects one end of the connecting section  141 . The extending section  142  extends upwardly from the other end of the connecting section  141 . A height of the extending section  142  is equal to that of the sidewall  13  to protect the LEDS  20  arranged on the base  11 . An outer surface of the extending section  142  resists an external component such as lamp housing to embed and fix the circuit board  10 . 
         [0017]    Referring to  FIG. 5 , the circuit board  10  and a lamp housing  60  are assembled. The lamp housing  60  includes a fastening plate  50 . The outer surface of the extending portion  142  resist an inner surface of the fastening plate  50  to embed and fix the circuit board  10 . Alternatively, the outer surface of the extending section  142  can also directly resist an inner surface of the lamp housing  60 . 
         [0018]    A cross-section of the sidewall  13  assembling the engaging portion  14  is “U” shaped. The sidewall  13 , the connecting section  141 , and the extending section  142  form the bent portion  12  to enhance a stability of the circuit board  10 . The bent portion  12  buffers a thermal load generated by the circuit board  10 . The positioning portion  112 , the sidewall  13 , and the engaging portion  14  are formed by a pressing method, a spinning method, a forging method, or an extruding method, and so on. The engaging portion  14  and the side wall  13  cooperate define a groove  16 . The groove  16  is annular. The groove  16  can be used to embed other components. The groove  16  and the recess  15  are located at two opposite sides of the sidewall  13 , that is the sidewall  13  separates the groove  16  and the recess  15 . 
         [0019]    The LEDs  20  are arranged on the base  11  of the circuit board  10  and received in the positioning portion  112 . The LEDs  20  are arranged on the top surface of the base  11 . The LEDs  20  electrically connects the circuit board  10 . In this embodiment, each LED  20  is a blue LED chip. Alternatively, the LEDs  20  could be LED chips generating light of different colors. The LEDs  20  are mounted on the top surface of the positioning portion  112  by chip on board method. 
         [0020]    The encapsulation layer  30  covers the LEDS  20  and is spaced from the LEDS  20 . A shape of the encapsulation layer  30  is matched with that of the positioning portion  112 . In this embodiment, the encapsulation layer  30  is circular. A size of the encapsulation layer  30  is slightly greater than that of the positioning portion  112 . The encapsulation layer  30  is arranged to engage the inner edge of the connecting portion  111 . A top surface of the encapsulation layer  30  is higher than that of the connecting portion  111 . The top surface of the encapsulation layer  30  is lower than the top end of the extending section  142 . The encapsulation layer  30  is made of transparent materials mixed with a phosphor. Alternatively, the encapsulation layer  30  can be embedded and received in the positioning portion  112 , and the top surface of the encapsulation layer  30  is coplanar with the top surface of the connecting portion  111 , such that the LED lamp  100  is thin with a relative small thickness. 
         [0021]    The orientation ring  40  resists the periphery of the encapsulation layer  30  and is arranged on the connecting portion  111  for enhancing a stability of the encapsulation layer  30 . 
         [0022]    When the LED lamp  100  works, the bent portion  12  of the circuit board  10  provides sufficient surface area to evenly and quickly dissipate heat generated by the LEDS  20 . Simultaneously, the LEDS  20  are received in the positioning portion  112  and protected by the bent portion  12 , such that the stability of the LED lamp  100  is increased. In addition, the circuit board  10  can be connected with external component such as lamp housing via the outer surface of the extending surface  142  without screws, such that the LED lamp  100  can be manufactured quickly by cutting down cost of manufacturing the LED lamp  100 . 
         [0023]    Referring to  FIG. 6 , a circuit board  10   a  assembled with a plurality of LEDS  20   a,  in accordance with a second embodiment,t is provided. The circuit board  10   a  is similar to the circuit board  10 , the difference is that the base  11   a  is circular and a flat plate, that is there is no positioning portion  112  depressed at the center of the base  11 a, and the LEDS  20   a  are evenly arranged on the base  11   a.  A cross-section of the circuit board  10   a  is “U” shaped. Alternatively, the LEDS  20   a  can be also arranged on the bottom surface of the base  11   a.    
         [0024]    Referring to  FIG. 7 , a circuit board  10   b  assembled with LEDS  20   b  in accordance with a third embodiment is provided. The circuit board  10   b  is similar to the circuit board  10   a  of the second embodiment. The difference is that the circuit board  10   b  only includes a base  11   b  and a sidewall  13   b  extending downwardly from an outer periphery of the base  11   b  without forming any engaging portion  14  of the second embodiment, that is the bended portion  12  only includes the sidewall  13   b.  An outer surface of the sidewall  13   b  resists other component and be embedded to fix the circuit board  10   b.  The base  11   b  is a circular and flat plate. A cross-section of the circuit board  10   b  is “n” shaped. 
         [0025]    It is to be further understood that even though numerous characteristics and advantages of the present embodiments have been set forth in the foregoing description, together with details of the structures and functions of the embodiments, the disclosure is illustrative only, and changes may be made in detail, including 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.