Patent ID: 6367415
Filing Date: 2002-04-09
Classification: B01J,C23C,G02B

Abstract:
In a chemical vapor deposition apparatus for manufacturing semiconductor devices, the apparatus having a pair of electrodes, one of the electrodes serving as a wall of a processing chamber of the apparatus and having through-hole, a view port comprising:a bracket protruding from a wall surface of said one of the electrodes at the outside of said chamber and extending around said through-hole, said bracket defining an opening aligned with said through-hole; a window of transparent material interposed between said opening in the bracket and said through-hole and pressed against said wall by the bracket; an annular sealing element extending around said through-hole, said annular sealing element interposed and providing a seal between said window and said wall; a cap mounted to said bracket so as to be movable between a closed position at which the cap completely covers the opening in said bracket, and an open position at which said opening is exposed so that the inside of said chamber can be viewed through said window; and heat loss-preventing means, integral with said cap, for maintaining the temperature of said cap during the deposition process performed by the apparatus, said heat-loss preventing means being positioned by said cap close to a front surface of the window, facing the outside of said chamber, when the cap is in said closed position, and said heat-loss preventing means being positioned away from said window when said cap is in said open position.