Hamamatsu-photonics K.k.

Tetsuya Morita

Motohiro Suyama

Suenori Kimura

Yoshihiko Kawai

Norio Asakura

Ken Hirano

Yutaka Hasegawa

Koichiro Oba

Makoto Nakamura

Tetsuya Saito

Hiroyuki Kyushima

Tomohiro Ishizu

Shirou Sakai

Hiroshi Suzuki

Takehisa Okamoto

Shiro Sakai

Haruhisa Yamaguchi

Kazunori Wada

A liquid scintillation counterserving as an optical measurement apparatus includes: an HPDa charge amplifiera voltage amplifiera comparatora countera multi-channel analyzera displayand the like. The HPDhas a photocathodeand an APDfor outputting a signal that corresponds to the number of incident photons. The comparatoroutputs a logic pulse signal, serving as a comparison result signal, only when the signal outputted from the HPDand amplified by the charge amplifierand voltage amplifieris larger than a prescribed threshold value. This threshold value is set larger than an output signal that is outputted when a single photoelectron is emitted from the photocathodeand smaller than another output signal that is outputted when two or more photoelectrons are emitted.

Optical measurement apparatus and method for optical measurement

An optical measurement apparatusprimarily includes: a photon detection unitfor detecting incident photons, a time signal output unitfor outputting a time signal, and a storage unitfor storing the time signal outputted from the time signal output unitwhen the photon detection unitdetects photons. The photon detection unitincludes a HPDhaving a photocathodeand an APD, a TZ amplifier, a peak holding circuit, and an A/D converter. The time signal output unitincludes a timerand a counter. The storage unitincludes a comparatorand a memory. When photons impinge on the HPD, a trigger signal is outputted from the comparator, causing the photon-number outputted from the A/D converterand the time data outputted from the counterto be stored in the memory

The present invention relates to a light-receiving module of a heat-resistant, vibration-resistant type for use in petroleum exploration or the like, and a radiation detecting apparatus equipped with the light-receiving module. The light-receiving module comprises a photomultiplier having a faceplate and a stem opposing each other, a bleeder circuit board provided so as to sandwich the stem together with the faceplate and electrically connected to the photomultiplier, a module case provided so as to accommodate the photomultiplier and the bleeder circuit board, said module case having an opening for exposing the faceplate of the photomultiplier, a step provided on an inner surface of the module case, and a stopper seated on the step, defining the position of the photomultiplier in the module case.

Light receiving module and radiation detecting apparatus equipped with the same

This invention relates to an electron tube having a structure for enabling a stable operation for a long time. In the electron tube, at least a confining mechanism is arranged between a photocathode and the electron incident surface of a semiconductor device, which are arranged to oppose each other. In the arrangement, the area of the opening of the confining mechanism is at least equal to or smaller than that of the electron incident surface, thereby confining the orbits of photoelectrons from the photocathode. This structure avoids bombardment of electrons arriving at portions other than the electron incident surface of the semiconductor device and prevents the semiconductor device from being unnecessarily charged.

Electron tube having a photoelectron confining mechanism

The present invention relates to an electron tube comprising, at least, a cathode electrode, a face plate having a photocathode, and an electron entrance surface provided at a position where the electron emitted from the photocathode reaches. The object of the present invention is to provide an electron tube which can reduce its size and has a structure for improving the workability in its assembling process. In particular, the electron tube according to the present invention has a bonding ring, provided between the face plate and the cathode electrode, for bonding the face plate and the cathode electrode together. The bonding ring is made of a metal material selected from the group consisting of In, Au, Pb, alloys containing In, and alloys containing Pb.

Electron tube

This invention relates to an electron tube which stabilizes the orbits of electrons accelerated and focused by an electron lens and has a structure for effectively suppressing noise generated due to discharge. This electron tube has, at two ends of an insulating container, a cathode electrode and an anode electrode which constitute the electron lens. Particularly, in the electron tube, one end of the cathode electrode and a photocathode are supported by a conductive member arranged at one end of the insulating container, and the cathode electrode is electrically connected to the photocathode. The cathode electrode partially extends to a stem along the inner wall of the insulating container and is tapered toward the stem so that the distal end portion of the cathode electrode is separated from the inner wall of the insulating container. Therefore, the electron tube realizes, regardless of the size of the insulating container, a structure for preventing the insulating container from being charged and suppressing discharge followed by light emission between the cathode electrode and the insulating container.

Electron tube with electron lens

The present invention relates to an electron tube includes, at least, a cathode electrode and a face plate having a photocathode which are arranged at one end of a body, and a stem arranged at the other end of the body for defining the position of an electron entrance surface where the electron emitted from the photocathode reaches. The object of the present invention is to provide an electron tube which can reduce its size and has a structure for improving the workability in its assembling process. In particular, the electron tube in accordance with the present invention comprises a bonding ring, provided between the face plate and the cathode electrode, for bonding the face plate and the cathode electrode together. The bonding ring is made of a metal material selected from the group consisting of In, Au, Pb, alloys containing In, and alloys containing Pb.

This invention relates to an electron tube having a structure for enabling a stable operation for a long time. In the electron tube, at least a confining mechanism is arranged between a photocathode and the electron incident surface of a semiconductor device, which are arranged to oppose each other through a container. Particularly, the area of the opening of the confining mechanism is smaller than that of the electron incident surface, thereby confining the orbits of photoelectrons from the photocathode. This structure avoids bombardment of electrons arriving at portions other than the electron incident surface of the semiconductor device and prevents the semiconductor device from being unnecessarily charged.

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.

Resistor assembly and electron multiplier using the same

The electron multiplying device according to this invention comprises an electron multiplying unit including dynodes arranged in a plurality of stages. The electron multiplying unit has an incidence opening for an energy beam to be multiplied to enter through, and has the proximal end secured to a base. There is provided a casing for housing the electron multiplying unit. The forward edge of the casing is secured to the base, and a space defined by the base and the casing houses the electron multiplying unit. The casing has an entrance window formed at a position opposed to the incidence opening. Energy beams enter the electron multiplying unit through the entrance window, but the electron multiplying unit itself is housed in the casing to be protected from surrounding air flow and unnecessary energy beams not to be measured.

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Hamamatsu, Japan

Tetsuya Morita