Patent ID: 8432530

Claim:
An aerial image measuring device used to measure an aerial image, the device comprising: a light blocking layer having at least a first aperture and a second aperture, wherein the first aperture comprises a slit, and the second aperture comprises a pinhole array, and wherein the first aperture transmits a light of at least one of TM and TE polarization components which is different from a light of the polarization components which the second aperture transmits; a detector which detects light transmitted through the first aperture and light transmitted through the second aperture; and a calculation unit which uses the light transmitted through the first aperture and the light transmitted through the second aperture to calculate the aerial image, wherein the pinhole array comprises a plurality of pinholes arranged in a longitudinal direction of the slit, the plurality of pinholes being formed with spacing such that properties of the TM and TE polarization components transmitted through the pinhole array are equal.