Patent ID: 7794563
Filing Date: 2010-09-14
Classification: H01J

Abstract:
1. An etching depth measuring device for measuring an etching depth of a substrate being processed, where the etching of the substrate uses active species present in a plasma of an ion beam from an ion beam source, the etching depth measuring device comprising: a second chamber contained in a first chamber; the second chamber having a port for introducing a part of the active species from the plasma of the ion beam while remaining part of the active species being used to process the substrate in the first chamber; a member housed in the second chamber and sputtered etched by the part of the active species from the plasma of the ion beam; and a mass detecting element which receives a substance generated from the member by sputtering to detect mass of the received substance, wherein the second chamber and the substrate being processed are contained in the first chamber and the first chamber has a port for attaching the source of the ion beam, the substrate and the member are etched simultaneously by the ion beam from the source, and a calculation module to calculate etch depth of the substrate on the basis of mass received by the mass detecting element in the second chamber.