Title:
TRANSMISSION TYPE ELECTRON LENS
Document Type and Number:
Japanese Patent JPS5299765
Kind Code:
A
Abstract:
PURPOSE: To enable to observe or photograpah with a proper concentration of electron flow on the fluorescent plate or film by interlocking the movements of projection lens and the excitation of condenser lens even when there is 10 - 15 times of variation in magnification.
Inventors:
KASAI SHIYOUZOU
Application Number:
JP1603976A
Publication Date:
August 22, 1977
Filing Date:
February 18, 1976
Export Citation:
Assignee:
HITACHI LTD
International Classes:
H01J37/26; (IPC1-7): H01J37/26
Previous Patent: JPS5299764
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