Abstract: A projector includes a housing, an internal projection mechanism, and an external air filtration device. The housing has a ventilation window portion. The internal projection mechanism is disposed in the housing, and includes an imaging system, a light source system for providing a light beam to the imaging system, and a ventilating fan. The external air filtration device includes a frame, a filter member, and an engaging unit. The engaging unit engages removably the frame to the ventilation window portion of the housing for securing the filter member on the exterior of the housing between the frame and the ventilation window portion.

Abstract: A lens cap set for covering an opening defined by a peripheral edge of a lens assembly includes a mounting seat adapted to be disposed on the peripheral edge of the lens assembly, and a lens cap. At least a portion of one of the mounting seat and the lens cap is made from a magnetically attractable material, and at least a portion of the other one of the mounting seat and the lens cap is made from a magnetic material. The lens cap is coupled magnetically and removably to the mounting seat for covering the opening defined by the peripheral edge of the lens assembly.

Abstract: A connector suitable for an electronic apparatus is provided. The connector includes multiple connection ports, a transmission part, and an aluminum-foil cover. The transmission part is electrically connected to the connection ports. The aluminum-foil cover comprises a first surface, a second surface, and glue. The first surface and the second surface are opposite to each other. The second surface faces towards the transmission part. The glue is disposed on the second surface. The aluminum-foil cover is stuck on the surface of the transmission part by means of the glue, such that the aluminum-foil cover covers the transmission part.