Patent ID: 8434878

Claim:
A projector comprising: a projection unit that projects projection light toward an illuminated surface; a housing that houses the projection unit and has an opening that allows the projection light to exit outward toward the illuminated surface disposed exterior to the housing; and a cover portion that blocks the opening and transmits the projection light through a light-incident surface formed on an exterior surface of the cover portion, wherein the cover portion has a plurality of areas, wherein an area adjacent to the one of the plurality of areas modifies the reflectance of the projection light on the light-incident surface at an angle within a range different from the predetermined range, wherein one of the plurality of areas is set as a reference area when the light incident surface of the reference area prevents the reflection of the projection light incident at an angle of incidence within the predetermined range, and wherein, in an area that is further away from the reference area, the light-incident surface of the area prevents the reflection of the projection light incident at a larger angle of incidence.