Patent ID: 7540633

Claim:
A lamp unit fixed to an optical unit and having a light source lamp and a reflector, said lamp unit comprising: a reflector holding member for holding said reflector; a positioner for positioning said reflector holding member to a stud provided in said optical unit, and having a throughhole for fixation of said reflector holding member to said stud; a cavity provided between said positioner and said reflector holding member connected to the throughhole; and a plurality of cooling holes provided in said reflector holding member for connecting said cavity with an interior of said reflector in which said light source lamp is mounted, said plurality of cooling holes each having different inner cross-sections from one another, and having different flow velocities of cooling air from one another, wherein said plurality of cooling holes are provided at a position and in a direction such that cooling air flowing through said cavity blows out toward one or more predetermined locations of said light source lamp, wherein said predetermined locations to which the cooling air blows out through said plurality of cooling holes include an upper bulb area, a lower bulb area, and a cathode of the light source lamp, and wherein each of said plurality of cooling holes open toward said upper bulb area, said lower bulb area, and said cathode of the light source lamp.