Specimen holder, observation system, and method of rotating specimen
There is disclosed a method of efficiently rotating a specimen without hindrance to observation of the specimen. A specimen holder having a holder body and a specimen-holding member is used. The holder body has a hole in which a step surface is formed. The specimen-holding member is supported from the step surface in the hole of the holder body and positioned within the hole. Arc-shaped slots are formed in the step surface. The specimen-holding member has an opening that accommodates the specimen. The specimen-holding member also has a surrounding portion through which rod-like members extend. The rod-like members have lower-end portions inserted in the slots formed in the step surface. The rod-like members also have upper-end portions. The specimen-holding member holding the specimen is rotated by rotating the upper-end portions of the rod-like members.
1. An observation system having a source of a beam of charged particles, holder support means for supporting a specimen holder that holds a specimen, an illumination lens for controlling the beam of charged particles emitted by the source and for directing the beam at the specimen, image pickup means for taking a transmission image of the specimen, and a focusing lens for controlling the beam of charged particles transmitted through the specimen and projecting the beam onto the image pickup means, wherein
(A) the specimen holder supported by the holder support means has a holder body provided with a hole having a step surface therein and a specimen-holding member having an opening for holding the specimen inside, the specimen-holding member being supported on the step surface in the hole of the holder body and placed within the hole,
(B) the step surface in the hole of the holder body is provided with at least one slot,
(C) the specimen-holding member has a surface to be supported, and
(D) the supported surface has at least one first convex portion inserted in the slot.
2. The observation system set forth in claim 1 , wherein plural slots are formed in the step surface in the hole of the holder body of the specimen holder and convex portions formed on the supported surface of the specimen-holding member are identical such that the convex portions correspond to the slots, respectively.
3. The observation system set forth in any one of claim 1 or 2 , wherein the slot or slots formed in the step surface in the hole of the holder body of the specimen holder is/are arc-shaped.
4. The observation system set forth in claim 3 , wherein first and second convex portions of the specimen-holding member of the specimen holder are made integral by rod-like members extending through the specimen-holding member.
5. The observation system set forth in any one of claim 1 or 2 , wherein a second convex portion is formed on a surface of the specimen-holding member of the specimen holder that is on an opposite side of the supported surface.
6. The observation system set forth in claim 5 , further comprising a specimen exchange chamber having a jig for rotating the specimen, said jig having a rod with a protruding portion to contact with the second convex portion of the specimen-holding member and to rotate the specimen-holding member.
7. The observation system set forth in any one of claim 1 or 2 , wherein a recessed portion is formed in a surface of the specimen-holding member of the specimen holder that is on an opposite side of the supported surface.
8. The observation system set forth in claim 7 , further comprising a specimen exchange chamber having a specimen-rotating mechanism, said mechanism having a rotating shaft with a fitting pin to be fitted into the recessed portion of the specimen-holding member and to rotate the specimen-holding member.