Patent ID: 6916512
Filing Date: 2005-07-12
Classification: C23C,H01J

Abstract:
1. A method for simultaneously coating plural surfaces on multiple sides of a substrate by means of a microwave plasma chemical vapor deposition process, said method comprising the steps of: a) arranging said substrate in a microwave reactor and launching plural microwave outputs into the microwave reactor at respective microwave launch sites, so that said plural surfaces to be coated on the substrate are perpendicular to spreading directions of corresponding plasmas formed by means of the respective microwave outputs in said microwave reactor; b) selecting the respective microwave outputs to be greater than or equal to a threshold value at which said corresponding plasmas have reduced permeability to microwave radiation; c) setting corresponding distances between said plural surfaces to be coated and said respective microwave launch sites greater than penetration depths of microwaves in said corresponding plasmas; d) placing respective dielectric tuning elements in corresponding microwave fields formed from said respective microwave outputs at said microwave launch sites; and e) adapting respective shapes of said dielectric tuning elements to corresponding shapes of said plural surfaces to be coated, so that inhomogeneities in plasma distributions in said plasmas are corrected and said plural surfaces are simultaneously provided with coatings of uniform thickness by the microwave plasma chemical vapor deposition process.