Patent ID: 8427919
Filing Date: 2013-04-23
Classification: B82Y,G03F,H01J

Abstract:
1. A pattern writing system configured to emit an energy beam onto a substrate that is divided into a plurality of frame regions based on writing data, the frame regions having a width which an energy beam can be deflected to by a main deflector; and a plurality of sub-deflection regions can be deflected to by a sub-deflector to write a pattern on the substrate, comprising: a detecting unit which detects reflected and scattered charged particles or reflected and scattered light generated by emitting the energy beam onto the substrate; a computing unit which computes a first value, the first value being an equivalent value of an instructed irradiation amount of a frame region, using the writing data; an integrating unit which integrates a signal from the detecting unit of the frame region to obtain a second value; and a comparing unit which compares the first value from the computing unit with the second value from the integrating unit; wherein the comparing unit compares the first value from the computing unit with a third value, the third value obtained by multiplying the second value from the integrating unit, by a predetermined coefficient of the frame region, and when the difference between the first and third values is at a predetermined threshold value or less, the comparing unit determines that an actual irradiation amount of the energy beam is normal, and when the difference between the first and third values is larger than the predetermined threshold value, the comparing unit determines that the actual irradiation amount of the energy beam is abnormal, and indicates the abnormality.