電流軸

objective current center

[目次：レンズ系]

対物レンズの励磁電流に変動を与えたとき電顕像が渦巻状に拡大縮小する。その拡大縮小の中心をいう。電流軸の中心を二段偏向系を使って像観察用の蛍光板の中心に合わせることを電流軸合わせという。対物レンズの電流変動は小さいので、普通は電圧軸合わせを行って電流軸合わせは行わない。

When fluctuations are added to the excitation current of the objective lens, a TEM image spirally enlarges and shrinks. The center of this enlargement and shrinkage is called "objective current center." Alignment of the objective current center is carried out to bring the objective current center to the center of the fluorescent screen for viewing the image by the use of a double-deflection coil system. Since the fluctuations of objective-lens current are small, normally the alignment of the objective current center is not performed, but the alignment of the accelerating voltage center is carried out.

関連用語から探す