Patent ID: 6403291
Filing Date: 2002-06-11
Classification: G03F

Abstract:
An exposure method for performing a periodic pattern exposure in which an exposure is performed with a periodic pattern and a projection exposure in which an exposure is performed by using a mask having a pattern whose line width is not greater than a resolving power of an exposure apparatus used therefor, the periodic pattern exposure and the projection exposure are being performed on a common exposure area without performing a developing process between the periodic pattern exposure and the projection exposure, said exposure method being characterized in that the projection exposure is performed while varying a relationship in position in an optical axis direction of a projection optical system between an image forming plane of the projection optical system and an exposure area, and that an interval of a plurality of positions of the exposure area relative to the image forming plane is set to a value not greater than a value obtained by dividing a depth of focus in the periodic pattern exposure by nâˆ’1 where n is the number of the plurality of positions.