X-RAY GENERATION TUBE, X-RAY GENERATION DEVICE, AND X-RAY IMAGING DEVICE

X-RAY GENERATION TUBE, X-RAY GENERATION DEVICE, AND X-RAY IMAGING DEVICE

X-ray generation tube includes electron gun, and anode having target to generate X-rays upon collision with electrons from the electron gun. The electron gun includes cathode having electron emitting portion, extraction electrode to extract the electrons from the electron emitting portion, and focus...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
1. Verfasser: TSUJINO, Kazuya
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
BASIC ELECTRIC ELEMENTS
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
ELECTRICITY
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Beschreibung
Zusammenfassung:X-ray generation tube includes electron gun, and anode having target to generate X-rays upon collision with electrons from the electron gun. The electron gun includes cathode having electron emitting portion, extraction electrode to extract the electrons from the electron emitting portion, and focusing electrode to focus the extracted electrons. The focusing electrode includes first portion having tubular shape, and second portion arranged inside the first portion. The first portion includes distal end facing the anode, the second portion includes opposing surface facing the anode, and the opposing surface includes electron passage hole through which the electrons from the electron emitting portion pass. Distance between the distal end and the anode is shorter than that between the opposing surface and the anode. Thermal conductivity of the distal end is lower than that of the second portion.