ELECTRON GUN AND ELECTRON BEAM APPLICATION APPARATUS

ELECTRON GUN AND ELECTRON BEAM APPLICATION APPARATUS

An electron beam emitted from a photoexcited electron gun is increased in luminance. An electron gun 15 includes: a photocathode 1 including a substrate 11 and a photoelectric film 10; a light source 7 that emits pulsed excitation light; a condenser lens 2 that focuses the pulsed excitation light to...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Enyama, Momoyo, Ide, Tatsuro, Ose, Yoichi, Kohmu, Naohiro, Katane, Junichi, Agemura, Toshihide, Morishita, Hideo, Ohshima, Takashi
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRIC ELEMENTS
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
ELECTRICITY
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Zusammenfassung:An electron beam emitted from a photoexcited electron gun is increased in luminance. An electron gun 15 includes: a photocathode 1 including a substrate 11 and a photoelectric film 10; a light source 7 that emits pulsed excitation light; a condenser lens 2 that focuses the pulsed excitation light toward the photocathode; and an extractor electrode 3 that faces the photocathode and that accelerates an electron beam generated from the photoelectric film by focusing the pulsed excitation light by the condenser lens, transmitting the pulsed excitation light through the substrate of the photocathode, and causing the pulsed excitation light to be incident on the photocathode. The pulsed excitation light is condensed at different timings at different positions on the photoelectric film of the photocathode.