Hamamatsu-Photonics K.k.

Shirou Sakai

Yoshiro Akai

Hiroyuki Kyushima

Tetsuya Morita

Hiroyuki Sugiyama

Makoto Nakamura

Takashi Watanabe

Hiroshi Suzuki

Kazunori Wada

The present invention relates to an alkali metal generating agent and others for formation of a photo-cathode or a secondary-electron emitting surface capable of stably generating an alkali metal. The alkali metal generating agent is used in formation of a photo-cathode for emitting a photoelectron corresponding to incident light, or in formation of a secondary-electron emitting surface for emitting secondary electrons corresponding to an incident electron. Particularly, the alkali metal generating agent contains at least an oxidizer comprising at least one vanadate with an alkali metal ion as a counter cation, and a reducer for reducing the ion. An alkali metal generating device comprises at least the alkali metal generating agent and a case housing it, and the case is provided with a discharge port for discharging the vapor of the alkali metal.

Alkali metal generating agent, alkali metal generator, photoelectric surface, secondary electron emission surface, electron tube, method for manufacturing photoelectric surface, method for manufacturing secondary electron emission surface, and method for manufacturing electron tube

The present invention relates to an alkali metal generating agent and others for formation of a photo-cathode or a secondary-electron emitting surface capable of stably generating an alkali metal. The alkali metal generating agent is used in formation of a photo-cathode for emitting a photoelectron corresponding to incident light, or in formation of a secondary-electron emitting surface for emitting secondary electrons corresponding to an incident electron. Particularly, the alkali metal generating agent contains at least an oxidizer comprising at least one tungstate with an alkali metal ion as a counter cation, and a reducer for reducing the ion. An alkali metal generating device comprises at least the alkali metal generating agent and a case housing it, and the case is provided with a discharge port for discharging the vapor of the alkali metal.

A spectroscopic system according to the present inventioncomprises: an optical fiber bundlewhose emitting endis arranged in a vertical direction; a slitwhich is arranged so as to oppose the emitting endof the optical fiber bundle; spectroscopic element arrangement meanswhich can switchably arrange either a first diffraction gratingin which grooves extending along the vertical direction are arranged in a horizontal direction at a predetermined groove density, or a second diffraction gratingin which grooves extending along the vertical direction are arranged in the horizontal direction at a groove density larger than that of the first diffraction grating, on an optical path of light which is emitted from the emitting endof the optical fiber bundleand passes through the slit; and a photomultiplier tubein which a plurality of anodesextending along the vertical direction are arranged in the horizontal direction.

Spectroscopic device

Regarding to the radiation detector, which has the scintillatorplaced on the light incidence plane plate member of the photomultiplier tube by use of the optical binderinterposed therebetween, and which includes a coated film FLM formed so as to cover the scintillator and at least part of the side tube portionof the photomultiplier tube, since the scintillator and the photomultiplier tube are strongly fixed to each other by use of the coating film FLM, so that the size increase of the radiation detector can be suppressed.

Radiation detector

An electron multiplier includes an improved resistor assembly for applying relevant voltages to respective dynodes. Resistor patterns are printed on one surface of an insulation substrate. Each resistor pattern is connected to one end of one of a plurality of conductor patterns which are also printed on the same surface of the insulation substrate, so that each resistor pattern is sandwiched between adjacent conductor patterns to provide a predetermined resistance therebetween. The other end of each conductor pattern extends to a corresponding insertion hole formed on the insulation substrate. One end of a conductor element, which may be a lead, wire, or other wire shaped conductor, is inserted into the corresponding insertion hole and electrically connected to its corresponding conductor pattern. At least the area around where the conductor pattern is connected to the conductor element and also areas around resistor patterns are covered with an insulating seal material. The other end of each conductor element is left exposed without being covered with the seal material and connected to a corresponding dynode.

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Hamamatsu, Japan

Shirou Sakai