Patent ID: 7866824

Claim:
A sealed lamp device comprising: a discharge lamp burner; a concave mirror opened to a front direction and reflecting radiation light of the discharge lamp burner to the opened side, an optical axis of the concave mirror being aligned with an optical axis of the discharge lamp burner; a hollow casing structure having an opening section in a front side, to which the concave mirror opened out; and a front plate closing the opening section of the hollow casing structure and emitting the radiation light, wherein the hollow casing structure is made wider than an opening width of the concave mirror, wherein a flow-guiding plate which guides air convection is disposed inside the hollow casing structure, and wherein the discharge lamp burner, the concave mirror, the hollow casing structure, and the front plate are arranged such that a sealed space is formed from a portion of the concave mirror opened to the front direction through an inside portion of the hollow casing structure to an inner side portion of the front plate in which the flow-guiding plate and at least a portion of the discharge lamp burner are accommodated in said sealed space.