The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 29, 2002
Filed:
Oct. 29, 1998
Other;
Abstract
Relationship among an exciting current of each lens of an irradiation lens system including at least two stages of irradiation lenses and an electron beam aperture, an irradiation electron beam density on a sample and an area of the sample surface irradiated with an electron beam is stored in a form of a table or equations, and an exciting condition of each of the lenses of the irradiation lens system is retrieved from the relationship and set the irradiation lens system to the retrieved condition, for example, when the enlarging magnification is changed under a condition of keeping the irradiation electron beam density at a constant value. Further, trails of a region of the sample surface irradiated with the electron beam is displayed on a display unit.