Patent ID: 7486383

Claim:
A direct exposure apparatus having a light source for projecting light onto an exposure target, comprising: measuring means for measuring an illuminance distribution of light on an area corresponding to an exposure surface of said exposure target; and control means for controlling, based on a measurement result supplied from said measuring means, said light source so that an intended illuminance distribution can be obtained, wherein said light source has a light source array constructed by arranging a plurality of point light sources in a matrix array, and said measuring means has a sensor array constructed by arranging a plurality of sensor elements in a matrix array, wherein said control means comprises: first computing means for computing in the form of a matrix a correspondence between the amount of light emitted from each of said point light sources and the amount of light measured by each of said sensor elements, based on the measurement result supplied from said measuring means when said point light sources are turned on in sequence and one at a time; and second computing means for computing, based on said matrix, a target amount of light emission for each of said point light sources in order to achieve said intended illuminance distribution, and wherein said control means controls each of said point light sources so that said target amount of light emission can be obtained.