Patent ID: 8969837
Filing Date: 2015-03-03
Classification: G21K,H01J

Abstract:
1. A multi charged particle beam writing method comprising: converting, for each shot of beams of multiple charged particle beams, a respective first gray scale value of each beam of the multiple charged particle beams, which is obtained by dividing an individual irradiation time period of the each beam by a quantization unit, into respective data of binary numbers of a predetermined digit number set in advance; dividing a maximum irradiation time period per shot of beams of the multiple charged particle beams into a plurality, being the predetermined digit number, of first irradiation time periods, each of which is calculated by multiplying a corresponding second gray scale value of a plurality of second gray scale values by the quantization unit, where the plurality of second gray scale values are gray scale values defined in decimal numbers converted from each digit value of data of binary numbers of the predetermined digit number; dividing a plurality of second irradiation time periods, which are a part of the plurality of first irradiation time periods into a plurality of third irradiation time periods; dividing irradiation of each beam of the multiple charged particle beams by using the plurality of third irradiation time periods and remaining undivided plurality of first irradiation time periods, into first irradiation steps which are irradiation steps of the plurality of third irradiation time periods and second irradiation steps which are irradiation steps of the remaining undivided plurality of first irradiation time periods; and irradiating, for each group of a plurality of groups in the each shot of beams, a target object, in order, with the multiple charged particle beams such that the plurality of groups are respectively composed of combination of at least two irradiation steps of first irradiation steps and second irradiation steps and the plurality of groups continue in order.