Opto-electronic system for electron microscope - has lenses formed around single magnetic core with annular grooves

The electromagnetic lens system incorporates three or more lenses formed around a single magnetic core (2) simplifying accurate alignment around the system axis. Maintaining a vacuum in the working tube of the lens is simplified by the absence of multiple elements. Machined annular grooves (16) in t...

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1. Verfasser: K. A. MAKAROV, O. P. BRATOV, A. F. PANOV, V. I. MOROZOV, G. D. KISEL, L. V. KAZAKOV,V. V. GURIN ET M. V. DERIPASKA
Format: Patent
Sprache:eng ; fre
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Zusammenfassung:The electromagnetic lens system incorporates three or more lenses formed around a single magnetic core (2) simplifying accurate alignment around the system axis. Maintaining a vacuum in the working tube of the lens is simplified by the absence of multiple elements. Machined annular grooves (16) in the core cause the magnetic flux set up by the energising coil to concentrate locally, forming electro-magnetic poles. The number and dimensions of the grooves can be designed to give the required electro-optic magnifying effect. The magnetic flux in the thin grooved sections of the core (17) saturates quickly allowing the formation of field configurations similar to those produced in the inter-pole spaces of conventional electro-magnetic lenses. L'INVENTION CONCERNE L'OPTIQUE ELECTRONIQUE.LE DISPOSITIF OPTOELECTRONIQUE, OBJET DE L'INVENTION, EST CARACTERISE EN CE QUE LE NOYAU INTERIEUR 2 DU CIRCUIT MAGNETIQUE 1 EST COMMUN A TOUTES LES LENTILLES ELECTROMAGNETIQUES DU DISPOSITIF ET EST REALISE SOUS FORME D'UN CYLINDRE CREUX AYANT SUR SA SURFACE EXTERIEURE DES RAINURES ANNULAIRES 16 QUI FORMENT, AVEC LES PARTIES VOISINES DUDIT NOYAU INTERIEUR SITUEES DES DEUX COTES DE CHACUNE DE CES RAINURES, LES POLES DES LENTILLES ELECTROMAGNETIQUES, LE NOMBRE DESDITES RAINURES ETANT EGAL AU NOMBRE DE LENTILLES ELECTROMAGNETIQUES UTILISEES DANS LE DISPOSITIF.LE DISPOSITIF EN QUESTION PEUT ETRE UTILISE, PAR EXEMPLE, DANS LES MICROSCOPES ELECTRONIQUES DU TYPE A TRANSMISSION, A BALAYAGE ET AUTRES.