US Patent 7329010 Rear projection apparatus

A housing is mounted with a screen. The housing accommodates a projector unit and a mirror. Image light emitted from the projector unit is projected to the rear of a translucent screen via the mirror. The projector unit includes a unit body, which accommodates liquid crystal display (LCD) panels and a projection lens, and a lamp housing in which a lamp unit is removably set. The lamp housing is rotatably attached to the unit body in a direction parallel to the screen and perpendicular to the unit body. The lamp housing is fixed to the unit body in a state that the lamp unit is set in a predetermined posture. The lamp unit is set in the lamp housing via a lamp opening of the housing.