Abstract: There is provided a filter clogging apparatus capable of detecting clogging of an individual filter without being limited to the direction in which cooling air is taken in. There is provided a filter clogging detection apparatus for detecting clogging in filter (2) for preventing dust contained in cooling air (7) for cooling object (6) to be cooled from passing through the filter. The filter clogging detection apparatus includes: force detector (11) disposed on case (5) in such a way as to abut on the face on the downstream side in the direction of flow of cooling air (7) of filter (2) and for detecting force applied to filter (2) when cooling air (7) passes through filter (2); and clogging determination part (12) determining that clogging is caused in filter (2) when a value detected by the force detector is larger than a predetermined threshold.

Abstract: A structure for cooling a lamp used for a projection type display apparatus is provided. The structure comprises a lamp house for housing a lamp that is operable as a light source, said lamp house being configured to be installed in a housing of said projection display apparatus; and a fan for supplying cooling air into said lamp house. The lamp house comprises a removable lamp house cover, and an exhaust duct for said cooling air is integrated with said lamp house cover.

Abstract: A structure for cooling a lamp used for a projection type display apparatus is provided. The structure comprises a lamp house for housing a lamp that is operable as a light source, said lamp house being configured to be installed in a housing of said projection display apparatus; and a fan for supplying cooling air into said lamp house. The lamp house comprises a removable lamp house cover, and an exhaust duct for said cooling air is integrated with said lamp house cover.