Abstract:
To provide an electron tube having good airtightness and being appropriate for mass production, indium (23) affixed to the inner surface of a sealing metal support member (24) is provided between a side tube (10) and input faceplate (21). The input faceplate (21) is pushed against the side tube (10). As a result, the indium (23) is squeezed by a pressure receiving surface (70) provided on the end face of the side tube. Since the pressure receiving surface (70) is in a generally declining shape from the inside out, the force of the pressing surface (70) causes the indium (23) to flow outward toward the sealing metal support member (24). Therefore, the indium (23) is firmly affixed to the pressure receiving surface (70), and the side tube (10) and input faceplate (21) can be reliably sealed by the indium (23).
Abstract:
To provide an electron tube having good airtightness and being appropriate for mass production, indium (23) affixed to the inner surface of a sealing metal support member (24) is provided between a side tube (10) and input faceplate (21). The input faceplate (21) is pushed against the side tube (10). As a result, the indium (23) is squeezed by a pressure receiving surface (70) provided on the end face of the side tube. Since the pressure receiving surface (70) is in a generally declining shape from the inside out, the force of the pressing surface (70) causes the indium (23) to flow outward toward the sealing metal support member (24). Therefore, the indium (23) is firmly affixed to the pressure receiving surface (70), and the side tube (10) and input faceplate (21) can be reliably sealed by the indium (23).
Abstract:
The present invention relates to a photomultiplier having a fine configuration capable of realizing stable detection accuracy. The photomultiplier has a housing whose inside is maintained vacuum, and a photocathode, an electron-multiplier section, and an anode are disposed in the housing. In particular, one or more control electrodes disposed in an internal space of the housing which surrounds the electron-multiplier section and the anode are electrically connected via one or more connection parts extending from an electron emission terminal of the electron-multiplier section. In this configuration, due to a voltage, instead of the applying between an electron entrance terminal and the electron emission terminal of the electron-multiplier section, being applied between the electron entrance terminal and the control electrodes, an electric potential gradient which is increased gradually from the photocathode side toward the anode side is formed in the electron-multiplier section, and a sufficient electric potential difference is provided between the electron emission terminal of the electron-multiplier section and the anode, which makes it possible to obtain stable detection accuracy.