Electron microscope
First Claim
Patent Images
1. An electron microscope comprising:
- an objective lens capable of changing a focal position of an electron beam;
projection means for projecting a light and shade pattern having a light-permeable portion and a light-shielding portion onto the surface of a specimen through said objective lens; and
detecting means for optically reflecting the projected pattern and detecting the projected pattern projected onto the surface of the specimen for enabling focusing of the electron beam onto the specimen.
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Abstract
An auto-focusing electron microscope used for the observation, measurement and/or checking of a circuit pattern or the like comprises an objective lens capable of changing a focal position of an electron beam, an optical system for projecting a light and shade pattern having a light-permeable portion and a light-shielding portion onto the surface of a specimen through the objective lens, and a detector for detecting the projected pattern while optically reflecting it, whereby focusing can be made while reducing any damage and/or charging of the specimen.
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Citations
6 Claims
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1. An electron microscope comprising:
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an objective lens capable of changing a focal position of an electron beam; projection means for projecting a light and shade pattern having a light-permeable portion and a light-shielding portion onto the surface of a specimen through said objective lens; and detecting means for optically reflecting the projected pattern and detecting the projected pattern projected onto the surface of the specimen for enabling focusing of the electron beam onto the specimen. - View Dependent Claims (2)
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3. An electron microscope comprising:
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an electromagnetic objective lens for changing a focal position of an electron beam; optical projection means provided for projecting a stripe pattern onto the surface of a specimen; detection means for detecting a contrast signal of the stripe pattern projected by said optical projection means; and control means for controlling said electromagnetic objective lens to perform the focusing of the electron beam onto the specimen in accordance with the contrast signal detected by said detection means. - View Dependent Claims (4, 5, 6)
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Specification