| 摘要 |
1,161,374. Electron microscopes. NIHON DENSHI K.K. 2 Feb., 1968 [3 Feb., 1967; 1 June, 1967], No. 5547/68. Heading H1D. An electron microscope comprises a specimen stage 1 slidable transverse to the beam axis and provided with a central opening in which a specimen holder 7 is arranged, and the stage is adjustable in position by means of two levers. In Fig. 1, one lever 5 is bifurcated and pivoted at 22 and 23, and the other lever 6 is pivoted at 26, and the two levers extend outside the microscope through respective bellows and are adjustable by micrometer screws 27 and 30. The levers bear on the specimen stage through balls held in grooves in the stage, which is biased towards the levers by a spring 34, and the stage is slidably mounted on the upper yoke 4 of the objective lens by means of balls (not shown). In a modification, Fig. 3 (not shown), one or both of the levers extends parallel to the axis and is adjustable by a screw extending through the wall of the microscope. In another modification, Figs. 5 and 6 (not shown), the two levers bear on diametrically opposed surfaces, and the specimen stage is constrained by a ball situated between parallel grooves in the stage and in its supporting surface. In further arrangements, Figs. 4 and 8 (not shown), the two levers are pivoted axially and act on diametrically opposed surfaces on the specimen stage which is constrained either by a fixed bearing surface (Fig. 4) or by a ball situated between parallel grooves in the stage and in its supporting surface (Fig. 8). |
