Patent ID: 7740385

Claim:
A projector device, comprising: a lamp unit; an optical system for generating image light using the lamp unit as a light source to project the generated image light toward a screen; a casing containing the lamp unit and the optical system, the casing having a wall surface provided with a vent opposed to the lamp unit, the wall surface of the casing opposed to the lamp unit having a light blocking mechanism arranged thereon covering the vent, the light blocking mechanism comprising a first light blocking member, the first light blocking member including a plurality of first light blocking plates arranged therein at certain pitches and extending in a same direction approximately perpendicular to a vent extending direction, each first light blocking plate comprising a flat inclined part having a predetermined angle of inclination relative to the wall surface, each first light blocking plate defining a gap providing an air flow passage; a second light blocking member arranged close to the first light blocking member in the vent extending direction, the second light blocking member having a plurality of second light blocking plates arranged therein at the same pitches as those of the first light blocking plates and extending in the same direction as the first light blocking plates, each second light blocking plate comprising a flat inclined part having a predetermined angle of inclination relative to the wall surface and extending in an inverted direction to the inclined part of each first light blocking plate, each second light blocking plate defining a gap providing an air flow passage, wherein the first light blocking plates and the second light blocking plates are arranged to provide a predetermined phase difference therebetween, so that the light blocking mechanism blocks the light emitted from the lamp unit toward the vent in all orientations.