Nikon Corporation

Jon E Lieberman

Michael S Gordon

Christopher Frederick Robinson

A method of aligning elements of an electron beam beam tool such as an electron beam projection lithography tool utilizes a detector such as a pinhole and scintillator over which an image is rastered to provide a real-time display of a projected image at a target plane. A shaping aperture is projected and the detector centered thereon. A reticle sub-field image is then centered on and aligned with the image of the shaping aperture and the compound image thus formed is rotated using deflectors. The compound image is then aligned with movement of a translation device at the target plane using lenses and compound image orientation is corrected by electrical or mechanical rotation of the deflectors. Sub-field size can then be adjusted and any observed further rotation of the compound image may be corrected by reiteration of rotation adjustment with lenses and deflectors, in sequence.

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Hopewell Junction, NY, United States of America

Jon E Lieberman