Pole piece for a transmission electron microscope
AssigneeThe Provost, Fellows, Scholars and Other Members of Board of Trinity College Dublin
InventorsLewys Jones, David O'Mahony
Life of this patent
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Abstract
A pole piece for a transmission electron microscope, the pole piece comprising an upper pole piece, containing a first pathway for an electron beam, a lower pole piece which is coupled to the upper pole piece and which contains a second pathway operatively connected to the first pathway, the upper pole piece and lower pole piece being separated by a gap between the first pathway and the second pathway. The pole piece has a mechanism which can extend or reduce the distance between the upper pole piece and the lower pole piece by changing the distance between the first pathway and the second pathway.
Claims21
A pole piece for a transmission electron microscope, the pole piece comprising:
- an upper pole piece, containing a first pathway for an electron beam,
- a lower pole piece which is coupled to the upper pole piece and which contains a second pathway operatively connected to the first pathway, the upper pole piece and lower pole piece being separated by a gap between the first pathway and the second pathway, characterised in that:
- the pole piece comprises a mechanism which can extend or reduce the distance between the upper pole piece and the lower pole piece by changing the distance between the first pathway and the second pathway, wherein, the mechanism comprises
- a spacer which couples the outer part of the upper pole piece to the lower pole piece;
- and
- an anulus rotatably mounted in a substantially circular channel between the outer part and the inner part of the upper pole piece and connected to an actuator wherein rotation of the annulus causes the actuator to move the inner part to extend or reduce the distance between the upper pole piece and the lower pole piece.
(canceled)
Dependencies are inferred from the claim text.