US Patent 7819535 Projection apparatus and cover glass attaching structure

A projection apparatus includes a light source unit. The light source unit includes a light source, a cover glass that transmits light emitted from the light source, and a case that holds the light source and the cover glass. The projection apparatus forms and projects an image using the light exiting the light source unit. The case includes a front case made of metal that covers a front of the light source and an insulating member that is attachable to an inner side of the front case. The front case and the insulating member each include an opening that allows light emitted from the light source to exit and a fitting portion into which the cover glass is fitted, the fitting portion being provided around the opening.