Patent ID: 7722195

Claim:
A projector, comprising: a light source device; and an exterior casing for housing the light source device, wherein the projector modulates a light beam irradiated by the light source device to project the light beam in an enlarged manner, the exterior casing includes: a top portion; a top opening formed in the top portion at a position corresponding to a position of the light source device; a lid capable of closing the top opening; a lid opening/closing portion for detachably attaching the lid relative to the top portion; and an engaging protrusion formed at the lid, the engaging protrusion projecting to an inside of the exterior casing via the top opening with the lid attached relative to the top opening, the lid opening/closing portion includes an engagement moving portion attached on a back surface of the top portion, the engagement moving portion having an engaging portion to be engaged with the engaging protrusion and being movable between an engaging position where the engaging portion engages with the engaging protrusion and a not-engaging position where the engaging portion does not engage with the engaging protrusion, the engagement moving portion includes an engagement moving portion slant surface, the engagement moving portion slant surface abutting on the engaging protrusion in a sliding manner when the engagement moving portion is moved to the not-engaging position to press the engaging protrusion toward the top portion, the engagement moving portion slant surface being provided at a position opposed to the engaging portion with the engaging protrusion being interposed therebetween when the engagement moving portion is located at the engaging position, the lid opening/closing portion has a base formed on a peripheral edge of the top opening of the top portion for attaching the engagement moving portion thereto, a first rib being formed on the base and protruding in a direction substantially orthogonal to the top portion, a second rib being formed on a back surface of the lid, the second rib protruding in a direction substantially orthogonal to the lid and fitting to the first rib with the lid attached relative to the top portion, and a hold structure being formed at each of the first rib and the second rib for holding a moving position of the lid relative to the top portion with the engagement moving portion positioned at the not-engaging position.