High voltage lead-through

Details High voltage lead-through High voltage lead-through

1980-09-05

1983-08-02

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Electrode and shield structures

With lead wire or connector

313250, 313336, 313268, H01J 550

Patent

active

043968619

ABSTRACT:
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.

REFERENCES:
patent: 3042828 (1962-07-01), Josephson
patent: 3601649 (1971-08-01), Steigerwald
patent: 3636346 (1972-01-01), Akahori et al.
patent: 3988627 (1976-10-01), Dustmann et al.
patent: 4057746 (1977-11-01), Dumonte
patent: 4250433 (1981-02-01), Bernard et al.

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