Patent ID: 8837108
Filing Date: 2014-09-16
Classification: B82Y,G03F,H01L

Abstract:
1. A glass substrate-holding tool, comprising: an electrostatic chuck having an active surface configured to generate an electrostatic attractive force such that the electrostatic attractive force from the electrostatic chuck attracts a rear surface of a reflective mask blank comprising a glass substrate for EUV; and a supporting device positioned outside the active surface of the electrostatic chuck and configured to support the reflective mask blank such that the supporting device makes contact with an outer peripheral region of the rear surface of the reflective mask blank surrounding a quality-guaranteed region of the rear surface of the reflective mask blank and that the active surface of the electrostatic chuck is kept apart from the quality-guaranteed region of the rear surface of the reflective mask blank by a distance of longer than 20 μm in a non-contact state, wherein the active surface of the electrostatic chuck is configured to form a projected area of the electrostatic attractive force which has a ratio of the projected area to an area of the quality-guaranteed region of the reflective mask blank in a range of at least 0.5 and at most 1.0.