Ventilating means for light source for projector

Claim 1

In a film projector having an electric lamp for projecting the film image on a remote screen, and further including an outer case having a pair of sidewalls, upper and bottom walls each having a plurality of air vents therein disposed forwardly of the rear end of the case and said case having air vents at its upper rear end; a cooling system for dissipating the heat generated by said electric lamp comprising, a pair of substantially parallel baffle plates mounted on opposite sides of said lamp and in general parallel relation to said case sidewalls, said baffle plates extending upwardly from a point adjacent the bottom of said lamp at least to a point adjacent the top of said lamp, an inverted U-shaped cover positioned above said lamp and said baffle plates, and including an upper transverse wall and two parallel depending side flanges, said upper transverse wall being inclined upwardly toward the upper rear end of said case to a point above said vents at said upper rear end of the case, said side flanges extending downwardly from said transverse well at least to a point adjacent the top of said baffle plates to generally form a continuation of the walls formed by said baffle plates in the upward direction, whereby a first cooling air passage is defined by the area enclosed by the two side flanges of said cover such that the portion of the rising air currents encompassed by said area are deflected by said transverse wall toward the vents at the upper rear end of said case, and a secondary cooling air passage is defined by the area outside the two side flanges such that the air currents enclosed by said latter area exit directly through the vents in said upper wall, said cover preventing air from said first cooling passage from passing to the vent openings in the upper wall, through which air from the secondary cooling passage pass.