Cold cathode device and vacuum gauge using same

Details Cold cathode device and vacuum gauge using same Cold cathode device and vacuum gauge using same

2006-11-28

2006-11-28

Williams, Hezron (Department: 2856)

Electricity: measuring and testing

Using ionization effects

For monitoring pressure

Reexamination Certificate

active

07141983

ABSTRACT:
A cold cathode device (20) includes a grid (24), a cold cathode (21) positioned under the grid, and a shield electrode (26) positioned above and parallel to the grid. A vacuum gauge includes a shell (32), a collector (39), an anode (38), and the cold cathode device of the present invention. The cold cathode device and the collector are positioned symmetrically relative to the anode. The collector, the grid and the cold cathode device are received in the shell. The shield electrode can shield an electric field of the grid for preventing from disturbing a symmetrical saddle field in the vacuum gauge. Electrons produced by the cold cathode device can obtain a long electron track because the electron vibration in the saddle field is symmetrical. Thus, the vacuum gauge has an improved sensitivity, and can be widely used to measure pressure in ultra-high and extremely high vacuum conditions.

REFERENCES:
patent: 3051868 (1962-08-01), Redhead
patent: 3378712 (1968-04-01), Lafferty
patent: 5278510 (1994-01-01), Baptist et al.
patent: 5422573 (1995-06-01), Bills et al.
patent: 6025723 (2000-02-01), Bills
patent: 6046456 (2000-04-01), Bills
patent: 6198105 (2001-03-01), Bills
patent: 6257069 (2001-07-01), Brady et al.
patent: 6515482 (2003-02-01), Kawasaki
patent: 6566884 (2003-05-01), Rutherford et al.
patent: 7049823 (2006-05-01), Correale
patent: 2003/0057953 (2003-03-01), Rutherford et al.
patent: 413828 (2000-12-01), None

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