Patent ID: 7672575

Claim:
An evaporator for evaporating mists of liquid raw material to thereby generate start gas for layer-formation, the evaporator comprising: an evaporator body having an evaporator chamber defined therein, and a mist supply throat for introducing a mists into said evaporating chamber, said evaporator chamber being defined by a principal evaporating face which opposes to said mist supply throat, said evaporator body further having a start-gas supply passage which is formed therein between said mist supply throat and said principal evaporating face so that the start gas flows out of said evaporating chamber through said start-gas supply passage; and a ridge member provided on an inner side wall surface of said evaporating chamber between said start-gas supply passage and said principal evaporating face so that a tip edge of said ridge member is directed to said principal evaporating face, wherein the ridge member is adapted to block a movement of the mist from the principal evaporating face towards the start-gas supply passage.