Patent ID: 7507004

Claim:
A lamp comprising: a housing including a housing body that surrounds an axis, and that has a first opening; a heat dissipating plate disposed in said housing body and having a peripheral portion that contacts said housing body, a first plate side that faces said first opening in said housing body, and a second plate side that is disposed opposite to said first plate side; a circuit unit disposed in said housing body and including a base plate that has a first plate surface coupled to said first plate side of said heat dissipating plate, and a second plate surface disposed opposite to said first plate surface, and a light emitting unit that is mounted to said second plate surface of said base plate, and that faces said first opening in said housing body; and a heat distributing unit disposed in said housing body and including a heat conducting bar that has a first contact end coupled to said second plate side of said heat dissipating plate, and a second contact end disposed opposite to said first contact end, and a heat distributing plate that is coupled to said second contact end of said heat conducting bar, and that has a plate periphery contacting said housing body; wherein heat generated by said circuit unit is transmitted to said housing body via said heat conducting bar and said heat distributing plate; and wherein said housing body of said housing further has a second opening formed in an axial direction opposite to said first opening, an inner wall surface surrounding the axis, and a plurality of ribs protruding radially and inwardly from said inner wall surface, each of said ribs having a first end disposed adjacent to said first opening and contacting said peripheral portion of said heat dissipating plate, and a second end disposed adjacent to said second opening and contacting said plate periphery of said heat distributing plate of said heat distributing unit.