Abstract
The image forming lens system of an electron microscope used for medical and biological applications has to meet the following requirements: (1) minimum off-axis aberration and distortion, (2) eliminated image rotation and focus deviation over wide magnification range, and (3) a wide field of view at low magnification. We have developed a new type of electron microscope which has a six-stage image forming lens system to satisfy the above requirements.The present paper describes the features of the electron microscope and also gives some application data for biological fields obtained with this instrument. The electron optical system is designed to provide a wide magnification range of 50x to l,000,000x by using a high resolution side entry goniometer with tilting facility of ±25°. Fig.l shows typical ray diagrams formed by the six-stage image forming system. The system consists of a dual objective (objective lens; OL and objective mini-lens; OM), triple intermediate lens (IL1, IL2 and IL3) and single projector lens (PL).
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