Detection apparatus, detection method and electron beam...

Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium

Reexamination Certificate

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C369S126000, C250S441110

Reexamination Certificate

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07095699

ABSTRACT:
A detection apparatus, a detection method and an electron beam irradiation apparatus for detecting deflection electrons in order to precisely focus even if a vacuum seal valve is provided. An electron beam irradiation apparatus including a vacuum seal valve mechanism which is provided in a static pressure floating pad, and opens/closes an electron beam passage with a piston so as to switch between an electron beam irradiation state and a vacuum seal state, and a deflection electron detector which is provided between the vacuum seal valve mechanism and a master disk and detects a deflection electron signal generated from the master disk with electron beam irradiation.

REFERENCES:
patent: 6775223 (2004-08-01), Eldredge et al.
patent: 03-064089 (1992-10-01), None
patent: 10-215836 (2000-02-01), None
patent: 10-219232 (2000-02-01), None

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