Patent ID: 9354502
Filing Date: 2016-05-31
CPC Classification: G03B,G03F

Claim Text:
1. An exposure apparatus, comprising: a programmable patterning device configured to produce a plurality of radiation beams for applying individually controllable doses to a target; a projection system configured to project each of the radiation beams onto a respective location on the target; and a controller configured to calculate target dose values to be applied by the plurality of radiation beams at a plurality of different times in order to form a desired dose pattern on the target, each target dose value defining the dose distribution of a spot exposure formed by the radiation beam to which the target dose value is applied, wherein: a nominal position of a characteristic point in the dose distribution of each of the spot exposures that the apparatus can produce lies at a point of a spot exposure grid; and the controller is configured to provide target dose values at the resolution of the spot exposure grid by: calculating target dose values at grid points on a lower resolution grid, the lower resolution grid having a resolution lower than the spot exposure grid; and for each of the calculated target dose values, deriving a target dose value at each of a plurality of points in the spot exposure grid.