Patent ID: 9508698
Filing Date: 2016-11-29
CPC Classification: F21K,H01L

Claim Text:
1. A light emitting device, comprising: a substrate that has opposite top and bottom surfaces, said top surface including a central region that is bounded by an imaginary boundary with a profile substantially conforming to an outline of a circle in combination with a polygon stacked on said circle, said central region having a substantially circular die bonding area that corresponds to said circle, and at least one polygonal extension area that is formed outside said circular die bonding area by an intersection of said circle with a corner part of said polygon; an upper metal layer that includes a conducting pad assembly including at least one first conducting pad and at least one second conducting pad, said first and second conducting pads being disposed on said top surface of said substrate and surrounding said central region; a lower metal layer that includes a soldering pad assembly including at least one first soldering pad and at least one second soldering pad, said first and second soldering pads being disposed on said bottom surface of said substrate and being electrically connected to said first and second conducting pads, respectively; a plurality of LED chips that are disposed on said substantially circular die bonding area of said central region; at least one Zener diode that is disposed on a non-electrically conducting portion of said at least one polygonal extension area of said central region, between said circular die bonding area and one of said first and second conducting pads; a plurality of conductive wires that electrically interconnect said LED chips, said at least one Zener diode, said at least one first conducting pad and said at least one second conducting pad to form at least one conducting loop; and a light-transmissible encapsulant disposed on said top surface of said substrate and that covers said LED chips wherein said at least one polygonal extension area of said central region is located between said circular die bonding area and one of said first and second conducting pads.