Abstract:
A bypass (2), a light receiving plate and stem plate form a sealed container for a photomultiplier tube. The bypass is formed by combining a plurality of warped-up frames (80). End faces (81a) each positioned correspondingly to each corner (81) at an opening end face on the light receiving plate side of the bypass are positioned higher than other end face portions (80a). On heating, the end faces (81a) are buried deep into the light receiving plate to enhance the joining between the bypass (2) and the light receiving plate. In addition, the entire opening on the light receiving plate side of the bypass (2) is buried in the light receiving plate to thereby ensure the joining between the bypass (2) and the light receiving plate and enhance a yield at the joining work. A resulting improved integration of the bypass (2) with the light receiving plate increases an air-tightness of the sealed container.
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.
Abstract:
PROBLEM TO BE SOLVED: To provide a liquid junction member capable of arranging a through-hole in a desired position, a reference electrode and a pH meter provided with the liquid junction member, and a glass member having the through-hole capable of arranging precisely the through-hole in the desired position. SOLUTION: This glass member 10 is used favorably as the liquid junction member 44. The glass member 10 is constituted to include a plurality of glass plates 11, 14, one or a plurality groves 12 serving as the through-hole 13 is formed on a plate face 11a of the at least one glass plate 14 (or 11) out of the plurality of glass plates 11, 14, and the plurality of glass plates 11, 14 is fused integrally under the condition where the plurality of glass plates 11, 14 is layered along a thickness direction to arrange the other glass plate 11 (or 14) on the plate face 11a formed with the groove 12. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a photomultiplier tube capable of easily and inexpensively forming a light incident part in a side tube part of a vacuum container. SOLUTION: A vacuum container 1 of a photomultiplier tube 100 is constituted of a substantially sectional square shaped and box type tube member 10 which is opened on an end side in a tube shaft direction and a substantially square flat stem member 11. In one side tube part 10s of the tube member 10, a circular light incident opening 10b for making light to be measured incident to a tube shaft from a side is formed. On an inner wall surface of the one side tube part 10s of the tube member 10, a circular flat light incident surface plate 5 is fixed so as to close up the light incident opening 10b via a ring-shaped bonding member 6. When a material of the light incident surface plate 5 is quartz glass, an aluminum ring is used as the bonding member 6. When the material of the light incident surface plate 5 is MgF2, frit glass (adhesive for glass seal) is used as the bonding member 6.
Abstract:
PROBLEM TO BE SOLVED: To obtain a photoelectric detector with a cooler having a good thermal bonding property and good assembling workability of a detector and a cooler by connecting a contact part for placing a tip end portion and a cooler of a cathode substrate via a container filling with a low-melting point metal and bonding them through dissolving and, solidifying the low-melting point metal. SOLUTION: When a detector main body 2 is inserted into a glass bulb from a downward direction in a state in which a low-melting point metal holding container 12 filled with a chip-shaped low-melting point metal is held by a groove at a bottom portion of the container 12, the container 12 comes into contact with a top board 14a having a contact portion with its thermal conductivity and electrical insulation property adhered and fixed to an upper end of the glass bulb 1 and inserted into the container 12, and the contact part is inserted into the container 12. When, in this state, the low-melting point metal is solidified after heated and dissolved a bonding piece 5A and the top board 14a are bonded with each other. A cooler 21 is placed on the top board 14a. Thus, thermal bonding property and assembling workability with the detector main body and the cooler are improved.
Abstract:
PROBLEM TO BE SOLVED: To provide a photomultifier tube with improved cooling efficiency. SOLUTION: Indium material 100 is filled between a grasping mechanism 13 and a jointing strip 5A, so that cooling efficiency of a supporting board 5 by a cooling unit 21 can be enhanced. Since a melting point of indium is lower than the temperature of a photocathode material 4 in an activation process, filling of the indium material 100 and the activation process of the photocathode material 4 can be carried out at the same time.