Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Reexamination Certificate
2005-02-08
2005-02-08
Wells, Nikita (Department: 2881)
Radiant energy
Invisible radiant energy responsive electric signalling
Including a radiant energy responsive gas discharge device
C250S3960ML, C250S397000, C250S306000, C250S307000, C250S310000
Reexamination Certificate
active
06852982
ABSTRACT:
In one embodiment of the present invention, a magnetic lens is provided that can generate a substantially constant amount of average heat power over a pre-selected range of resultant magnetic field strengths. The lens is configured to do this with multiple, asymmetric (different turns) coil sections that can produce a desired range of field strengths, and at the same time, maintain a sufficiently constant temperature signature when the average total power is maintained constant thereby eliminating unreasonable delays in lens operation when the resultant field strength is changed. The asymmetric lens structure allows for the smaller coil to be made with less relative inductance thereby making it more responsive and amenable for an AC drive signal and thus dynamic focusing applications if desired. Thus, a magnetic lens is now provided that can produce a range of magnetic beam-focusing field strengths, implement dynamic focusing, and not impose unreasonable delay for thermal stabilization between changes in magnetic field strength.
REFERENCES:
patent: 4345152 (1982-08-01), Gerlach
patent: 6051839 (2000-04-01), Crewe
patent: 6515287 (2003-02-01), Notte, IV
J. B. Pawley, “Use of Pseudo-Stereo Techniques to Detect Magnetic Stray Field in the SEM”,Scanningvol. 9 pp. 134-136, (1987).
Bierhoff Martinus Petrus Maria
Kooijman Cornelis Sander Kees
Sanford Colin August
FEI Company
Scheinberg Michael O.
Wells Nikita
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