Patent ID: 8349081

Claim:
A gas distributor in a CVD or OVPD reactor with two or more gas volumes ( 1 , 2 ), into each of which a supply line ( 3 , 4 ) for a process gas opens out, each gas volume ( 1 , 2 ) being connected to a multiplicity of outlet openings ( 6 , 7 ) for a respective one of the process gases, which open out in a bottom ( 5 ) of the gas distributor, the process gases respectively being first distributed in a radial direction in a first plane ( 8 ), remote from the bottom ( 5 ), and then distributed in a circumferential direction in a second plane ( 9 ′), adjacent to the bottom ( 5 ), and flowing through connecting channels ( 14 , 15 ), which are located in a third plane ( 9 ) disposed between the first plane and the second plane, and a multiplicity of gas distributing chambers ( 12 , 13 ) that are respectively associated with the gas volumes ( 1 , 2 ) and are connected to the outlet openings ( 6 , 7 ) being provided in the second plane ( 9 ′), the gas distributor characterized in that the gas volumes ( 1 , 2 ) have pre-chambers ( 10 , 10 ′, 11 ), at least one pre-chamber of one gas volume and at least one pre-chamber of another gas volume lying at a common elevation in the first plane ( 8 ), the pre-chambers ( 10 , 10 ′, 11 ) of the two gas volumes ( 1 , 2 ) forming continuations like prongs of a comb that extend in the radial direction and engage with one another in a manner of prongs of a comb, the comb-like continuations that lie next to one another in the circumferential direction being separated from one another by a wall ( 17 ).