Patent ID: 9343323
Filing Date: 2016-05-17
CPC Classification: H01J,H01L

Claim Text:
1. A method of producing an aperture member for a charged particle beam apparatus, the method comprising: applying a charged particle beam to a plurality of chip areas on a first substrate while changing a writing condition to write a first pattern corresponding to an aperture opening in each chip area; processing the first substrate based on the written first pattern to form a second pattern; measuring dimensional accuracy and edge positional accuracy of the second pattern in each chip area; cutting out a chip area provided with the second pattern having desired dimensional accuracy and desired edge positional accuracy from the first substrate to produce a template; allowing a template pattern of the template including the second pattern to come into contact with a resist overlying a front surface of a second substrate; hardening the resist; separating the template from the hardened resist to pattern the resist with a transfer pattern corresponding to the template pattern; processing the second substrate using the transfer pattern as a mask to form a first recess in the front surface; and etching a rear surface of the second substrate to form a second recess communicating with the first recess such that an opening extending through the second substrate is formed.