Patent ID: 7289192
Filing Date: 2007-10-30
Classification: G03F

Abstract:
1. A projection exposure device for manufacturing a printed circuit board by exposing a pattern onto a board, comprising: a photo mask depicted with a pattern, a projecting means for projecting the pattern of the photo mask onto said board, a light source for emitting exposing light to expose the pattern depicted with said photo mask onto the board via said projecting means, a magnification correcting device positioned between said photo mask and said board for correcting the magnification of expansion or reduction of said pattern; wherein, said magnification correcting device comprises, a plate that is transparent for said exposing light, a closed space formed at one side of said plate, means for changing a pressure of said closed space, wherein said plate is rectangular, opposite two edges thereof are fixed and other opposite two edges are free and is deformed by pressure changing of said closed space.