Patent ID: RE41874

Claim:
A method for manufacturing a reflective mirror manufacturing method for manufacturing a reflective mirror used in an illumination device including an arc tube including having a light-emitting portion and a reflective mirror including having a reflective surface that reflects light from the light-emitting portion in a predetermined direction, the method comprising: a first step of forming heating a tube by heating a tube including comprising a material of the reflective mirror, thereafter putting the tube in a form block, applying internal pressure with an inert gas to cause a center portion of the tube to expand, so that part of an inner surface of the expanded center portion includes a shape corresponding to the reflective surface of the reflective mirror; the expanded center portion being continuous with a part of a tube portion that includes a shape corresponding to a fixing portion where the arc tube is fixed to the reflective mirror; a second step of cutting the tube at the expanded center portion to form a reflective mirror member; and a third step of forming a reflective layer on an inner surface the reflective surface of the reflective mirror member.