US Patent 11537034 Projection optical apparatus and projector with improved cooling capability

A projection optical apparatus includes a first housing, a second housing accommodated in the first housing, and a projection system accommodated in the second housing. The projection system includes a first reflector deflecting the optical path of the projection system. The first housing has a plurality of first openings that cause the interior of the first housing to communicate with the exterior of the first housing. The second housing has a plurality of second openings that cause the interior of the second housing to communicate with the exterior of the second housing.