Patent ID: 8282377

Claim:
An apparatus for producing a three-dimensionally shaped object, comprising: a unit for forming a powder layer; a light beam irradiation unit for irradiating a light beam on a specified portion of the powder layer to form a solidified layer; and a substrate on which the powder layer and/or the solidified layer are formed, wherein the light beam irradiation unit includes: a mirror for use in scanning the light beam, wherein the mirror has a reflection surface for reflecting the light beam and a rear surface opposite to the reflection surface; a gas supply member for supplying a gas to the mirror, wherein the gas supply member has a gas outlet port arranged to face the rear surface of the mirror; a first support member which supports the mirror such that the mirror is allowed to make a reciprocating swing movement about the first support member while scanning the light beam; and a second support member which supports the gas supply member, wherein the first support member and the second support member are separated from each other and the rear surface of the mirror and the gas outlet port are separated from each other.