Patent ID: 7618155

Claim:
A flashlight comprising: a light emitting diode (LED) unit, comprising: a metal base having a first end and a second end, wherein said first end internally tapers towards bottom of said metal base to form a reflective inner surface comprising a flat portion; a metal core printed circuit board (PCB) mounted on said flat portion of the metal base, wherein one or more LED dies are conductively mounted on both sides of said metal core PCB by one of welding and adhering, and wherein the one or more LED dies are interconnected using one or more wires; one or more metal screws inserted through one or more recesses around outer periphery of the metal base for establishing a contact between the metal core PCB and the metal base, wherein the metal base absorbs and dissipates heat produced by the LED dies; a lens mounted on the first end of the metal base in front of the reflective inner surface; and a printed circuit board (PCB) attached to said second end of the metal base for providing a first electrical connection to the one or more LED dies through said one or more wires, wherein the one or more wires are connected to one or more metal pins inserted through one or more insulated openings in the metal base, and wherein said metal pins form a leadframe on top of said PCB; a cylindrical housing for accommodating one or more batteries, wherein said cylindrical housing comprises a first opening and a second opening, and wherein the cylindrical housing is attached to the second end of the metal base through said first opening; said batteries for providing electrical power to the one or more LED dies, wherein said batteries are in electrical communication to provide a first terminal and a second terminal, and wherein said first terminal is connected to said first electrical connection of the PCB; and an end cap attached to the cylindrical housing through said second opening for holding a control unit, wherein said control unit establishes a second electrical connection between the one or more LED dies and said second terminal through the cylindrical housing, the metal base, the one or more metal screws, and the metal core PCB.