Apparatus and method for mounting pole piece in electromagnetic lens
AssigneeInternational Business Machines Corporation
InventorJoseph J. Senesi
Life of this patent
Estimating the term…
Abstract
A ferrite pole piece is mounted in an electromagnetic lens by placing a mounting ring around the pole piece and securing it with an adhesive. The internal diameter of the mounting ring is sufficiently greater than the outer diameter of the pole piece that the ferrite is not chipped when the mounting ring is placed around the pole piece. The pole piece, with the mounting ring secured, is inserted in a centering plate in the lens, and the mounting ring is secured to the centering plate.
Claims16
Apparatus for accurately positioning a ferrite pole piece in an electromagnetic lens, wherein the pole piece has an outer diameter, comprising:
- a mounting ring for positioning around the pole piece, said mounting ring having an inner diameter sufficiently larger than the outer diameter of the pole piece that a gap is present between the mounting ring and the pole piece;
- and
- an adhesive substantially filling the gap and securing the ring to the pole piece,
- wherein the ring has a surface in contact with the adhesive and a structure spaced radially outward from said surface, said structure being adapted to be secured to other structure of the electromagnetic lens.
A method for accurately positioning in an electromagnetic lens a ferrite pole piece having an outer diameter comprising:
- placing a mounting ring around the pole piece;
- securing the mounting ring to the pole piece;
- providing in the electromagnetic lens a centering plate having a main opening having a diameter sufficiently greater than the outer diameter of the pole piece that a gap is present between the plate and the pole piece when the pole piece is in the main opening;
- inserting the pole piece into the main opening;
- and
- securing the mounting ring to the plate.
Dependencies are inferred from the claim text.