Electron source with light shutter device

Details Electron source with light shutter device Electron source with light shutter device

1996-07-03

1999-12-14

Day, Michael

Electric lamp and discharge devices

Photosensitive

Photocathode

313543, 313525, 313537, 313422, 3151691, 345 75, H01J 4018, H01J 2968

Patent

active

060022078

ABSTRACT:
An electron source includes a photocathode (20) for emitting electrons on excitation by incident light radiation. A permanent magnet (60) is perforated by a plurality of channels extending between opposite poles of the magnet (60). The magnet (60) generates, in each channel, a magnetic field which forms electrons received from the photocathode (20) into an electron beam for guidance towards a target (90). A shutter device (22) is provided having an array of addressable shutter elements, each selectively actuable to alternately admit and block passage of light radiation onto the photocathode (20) in response to an address signal.

REFERENCES:
patent: 4618801 (1986-10-01), Kakino
patent: 4663559 (1987-05-01), Christensen
patent: 4763041 (1988-08-01), Segawa
patent: 5325014 (1994-06-01), Murai et al.
patent: 5473222 (1995-12-01), Thoeny et al.
patent: 5747923 (1998-05-01), Beeteson et al.
patent: 5753998 (1998-05-01), Beeteson et al.
patent: 5760548 (1998-06-01), Beeteson et al.
patent: 5804833 (1998-09-01), Stettner et al.

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