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Magnetic Contrast in Transmission Electron Microscope

IP.com Disclosure Number: IPCOM000076290D
Original Publication Date: 1972-Feb-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Hutchison, JD: AUTHOR [+2]

Abstract

Schematically represented is an electron microscope for detecting the configuration of a field from field source 10. The field is observed by placing a grid 12 in the path of the electron beam and observing the final image 14 of the grid, as it has been distorted by the field from source 10. The grid 12 might possibly be placed at point 16 in the field of the field source 10. However, to obtain good resolution of the field, it would be desirable to have at least a 20,000 mesh grid. A 20,000 mesh grid is very difficult and expensive to obtain. Therefore, as an alternative, a 2,000 mesh grid 12 is placed between the first condenser lens 18 and the second condenser lens 20. The second condenser lens 20 reduces the effective size of grid 12 down to an image which is equivalent to a 20,000 mesh grid at point 16.

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Magnetic Contrast in Transmission Electron Microscope

Schematically represented is an electron microscope for detecting the configuration of a field from field source 10. The field is observed by placing a grid 12 in the path of the electron beam and observing the final image 14 of the grid, as it has been distorted by the field from source 10. The grid 12 might possibly be placed at point 16 in the field of the field source 10. However, to obtain good resolution of the field, it would be desirable to have at least a 20,000 mesh grid. A 20,000 mesh grid is very difficult and expensive to obtain. Therefore, as an alternative, a 2,000 mesh grid 12 is placed between the first condenser lens 18 and the second condenser lens 20. The second condenser lens 20 reduces the effective size of grid 12 down to an image which is equivalent to a 20,000 mesh grid at point 16. The remaining structure of the electron microscope is electron gun assembly 22, the objective lens 24, intermediate lens 26 and projector lens 28. The projector lens 28 projects the final image 14 onto a fluorescent screen 30.

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