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US 4,396,861 AGranted
High voltage lead-through
AssigneeCarl-Zeiss-Stiftung
InventorsDietrich Hoffmeister, Wilhelm Egle
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AssigneeCarl-Zeiss-Stiftung
InventorsDietrich Hoffmeister, Wilhelm Egle
Estimating the term…
The invention contemplates lead-through structure for the high-voltage electrode of an electron microscope or the like, in conjunction with shaping of the high-voltage electrode and of the body of insulating material via which the lead-through is supported, in reference to metal envelope structure. The high-voltage electrode has a step-wise enlargement, and the surface of the insulating material which is exposed to the vacuum commences at the start of the step-wise enlargement. As a result, the field strength along the vacuum-exposed insulator surface is so influenced that a minimum electric field strength is produced at the boundary line between the vacuum and the high-voltage electrode. The further result is to prevent occurrence of microdischarges.
A high-voltage lead-through construction for introducing a high voltage through an evacuated envelope and into the evacuated interior thereof, said construction comprising a tubular metal envelope portion, a high-voltage electrode including a first tubular portion within and uniformly spaced from said tubular metal envelope portion, and a body of solid insulating material filling the space between said tubular portions, said electrode further including a second and smaller tubular portion having an integrally formed step-reducing portion extending with vacuum exposure within said envelope portion, said body of insulating material extending within and being circumferentially bonded to said envelope portion in at least part of the region of smaller tubular-portion overlap by said envelope portion, and the vacuum-exposed end of said insulating body being characterized by a radially inward convergence in the direction of and substantially to juncture of said smaller tubular portion with said reducing portion.
A high-voltage lead-through construction for introducing a high voltage through an evacuated envelope and into the evacuated interior thereof, said construction comprising a tubular metal envelope portion, a high-voltage electrode including a cylindrical portion extending from a base end and with vacuum exposure within said envelope portion, said electrode base end including an integral generally radially outward enlargement having a peripheral contour uniformly spaced from and within said envelope portion, and a body of solid insulating material bonded to said enlargement and filling the space to said envelope portion, said body extending within and being circumferentially bonded to said envelope portion in at least part of the region of cylindrical-portion overlap by said envelope portion, and the vacuum-exposed end of said insulating body being characterized by a radially inward convergence in the direction of and substantially to juncture of said cylindrical portion with said generally radially outward enlargement.
Dependencies are inferred from the claim text.