Patent ID: 6571488
Filing Date: 2003-06-03
Classification: F26B,H01L

Abstract:
In an apparatus for spin drying substrates in a spin dryer tank, wherein a spin dryer cover is movable between a closed position to close an opening of the spin dryer tank and an open position to open the spin dryer tank, and wherein a cylinder is coupled with the spin dryer cover, the cylinder movable in a first operation to move the spin dryer cover to the open position and movable in a second operation to move the spin dryer cover to the closed position, a system for sensing the position of the spin dryer cover comprising:a cylinder sensor configured to sense the first operation and the second operation of the cylinder; a cover sensor configured to sense the position of the spin dryer cover; and a logic circuit configured to output a cover opening signal indicating that the spin dryer cover is in the open position when the cylinder sensor senses the first operation of the cylinder and the cover sensor senses that the spin dryer cover is in the open position.