Patent ID: 6864954

Claim:
Peripheral exposure device for exposing a substrate with a surface which is provided with alignment marks, with an outside peripheral area provided with a singularly shaped point, and to which a photoresist has been applied, comprising: a rotary stage on which the substrate is seated, movement means for producing relative movement between the rotary stage and an area irradiated with exposure light from a light source, a means for determining the singularly shaped point and an edge position which determines the singularly shaped point and an edge position of the substrate; and a control element adapted to store position information of the alignment marks formed on the substrate, and which, based on edge position information and the position information about the singularly shaped point which has been obtained by the means for determining, and based on position information of the alignment marks formed on the above described substrate, and adapted to compute positions of the alignment marks on the substrate seated on the rotary stage, wherein, based on the positions computed by the control element, said movement means is adapted to bring the area which is irradiated with exposure light, and the positions of the alignment marks into agreement with one another for exposing the photoresist which has been applied to the areas at which the alignment marks are formed.