ELECTRON GUN, X-RAY GENERATION APPARATUS, AND X-RAY IMAGING APPARATUS
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United States of America Patent
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Issued Date -
Aug 13, 2020
app pub date -
May 1, 2020
filing date -
Dec 28, 2018
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Abstract
An electron gun includes a cathode including an electron emitting portion, an extraction electrode for extracting electrons emitted from the electron emitting portion, and a focusing electrode for focusing the electrons extracted by the extraction electrode. The focusing electrode includes an outside electrode having a tubular shape, and an inside electrode arranged inside the outside electrode. The inside electrode defines a first space having a columnar shape, and includes a first surface on a side of the cathode, and a second surface on an opposite side of the first surface. An inside surface of the outside electrode and the second surface of the inside electrode define a second space. The inside electrode includes an electron passage hole, and a communicating portion which makes the first space and the second space communicate with each other.
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