Patent ID: 8128256

Claim:
A lighting device comprising: a housing; a coupling member being coupled to the housing and including an insertion groove in which a first connection terminal is formed; at least one reflector located between the housing and the coupling member; and a light source unit being coupled to the insertion groove of the coupling member, including a second connection terminal being electrically connected to the first connection terminal, and emitting light emitted from the light source unit in a direction to the reflector, wherein the first connection terminal includes at least one pair of female blocks disposed in the middle portion of the insertion groove, wherein at least one pair of terminals are formed within each female block of the pair of female blocks, wherein the pair of terminals in one female block of the pair of female blocks is symmetric to the pair of terminals in the other female block of the pair of female blocks, and a polarity of the pair of terminals in one female block is symmetric to the pair of terminals in the other female block, wherein the second connection terminal includes at least one pair of male blocks provided in correspondence with the pair of the female blocks, and wherein at least one pair of sockets are formed respectively on the pair of the male blocks and the sockets is in correspondence with and are electrically connected to at least the one pair of the terminals which is formed within each of the pair of the female blocks.