Patent ID: 8916840
Filing Date: 2014-12-23
Classification: B82Y,H01J

Abstract:
1. A lithography apparatus that scans a charged particle beam on a substrate and performs writing on the substrate, the apparatus comprising: a stage configured to hold the substrate and to be movable; a deflector configured to deflect the charged particle beam to scan the charged particle beam; a detector including a shield for shielding the charged particle beam, configured to be provided on the stage, and to detect an intensity of the charged particle beam not shielded by the shield; and a controller configured to control a deflecting operation of the deflector depending on a deflection signal; wherein the detector has a first detecting-start position and a second detecting-start position, the second detecting-start position being different from the first detecting-start position in a second direction orthogonal to a first direction that is parallel to a scan direction of the charged particle beam, for starting to detect the intensity of the charged particle beam, wherein the edge of the shield has a first shielding position, the first shielding position being different from the first detecting-start position in the first direction and being equal to the first detecting-start position in the second direction, and a second shielding position, the second shielding position being different from the second detecting-start position in the first direction, being equal to the second detecting-start position in the second direction and being different from the first shielding position in the first and second direction, wherein the controller controls the deflecting operation depending on a deflection signal so that the detector detects an intensity of the charged particle beam in a first detecting period in which the deflector scans the charged particle beam from the first detecting-start position to the first shielding position on the detector, wherein the controller controls the deflecting operation depending on a deflection signal so that the detector detects an intensity of the charged particle beam in a second detecting period in which the deflector scans the charged particle beam from the second detecting-start position to the second shielding position on the detector, and wherein the controller includes a processor configured to determine a relationship between the deflection signal and a scan position of the charged particle beam scanned depending on the deflection signal, based on the intensity of the charged particle beam detected in the first detecting period and the intensity of the charged particle beam detected in the second detecting period.