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公开(公告)号：JPH11345588A
公开(公告)日：1999-12-14
申请号：JP15160398
申请日：1998-06-01
Applicant: HAMAMATSU PHOTONICS KK
Inventor： KUSHIMA HIROYUKI , ATSUMI AKIRA , SHIMOI HIDEKI , OKADA TOMOYUKI , ITO MASUYASU
Abstract: PROBLEM TO BE SOLVED: To implement further miniaturization by abutting the inside wall surface at the lower end of the side tube of a sealed container on an edge surface of a stem plate and then welding the side tube to the stem plate. SOLUTION: When a stem plate 14 is airtightly welded to a side tube, the stem plate 4 is inserted from an open end 2B of the side tube, an inside wall surface 2c at the lower end 2a of the side tube is abutted on an edge surface 4b of the stem plate and the lower surface of the stem plate 11 is arranged flush with the lower end surface of the side tube 2 and thus, the lower end surface of the side tube is prevented from projecting from the stem plate 4. Thereby, there is no projection like a flange at the lower end of a photomultiplier tube 1. Laser welding is performed to the joined part in this condition. As a result of the elimination of the projection at the lower end of the photomultiplier tube 1, the outside dimension of the photomultiplier tube 1 can be reduced, a dead space can be eliminated as much as possible even if the multiple photomultiplier tubes 1 are used by arranging them side by side. and their side tubes can tightly be fitted together. That is. the photomultiplier tube 1 can be miniaturized and arranged in high density.
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公开(公告)号：JPH0945275A
公开(公告)日：1997-02-14
申请号：JP14817996
申请日：1996-05-17
Applicant: HAMAMATSU PHOTONICS KK
Inventor： KIMURA SUENORI , ITO MASUYASU , SUZUKI ATSUHIDE
IPC: H01J43/22
Abstract: PROBLEM TO BE SOLVED: To significantly reduce the possibilities that multiplication rates are varied and that fine-mesh dynodes are broken during manufacture. SOLUTION: This photomultiplier tube has a caulked part 205 formed at a predetermined position on a hollow pipe 2 which has a T-shaped edge 202 and which passes through a dynode part 500 including fine-mesh dynodes, thereby specifying the layered structure of a photomultiplier part by means of the edge 202 and the caulked part 205. The photomultiplier tube whose manufacturing errors are reduced by accurately controlling the intervals between the fine- mesh dynodes can thus be obtained. Also, the hollow pipe is a double structure of an inside pipe 200 made of a conducting material and an outside pipe 201 made of an insulating material, the inside pipe 200 constituting a part of a wiring structure electrically connecting a photocathode to a stem pin.
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公开(公告)号：JPH0935680A
公开(公告)日：1997-02-07
申请号：JP18402295
申请日：1995-07-20
Applicant: HAMAMATSU PHOTONICS KK
Inventor： KUSHIMA HIROYUKI , OMURA TAKAYUKI , NAKAMURA KOJI , KIMURA SUENORI , OHASHI YOSUKE , ITO MASUYASU
Abstract: PROBLEM TO BE SOLVED: To retard the generation of a pre-pulse by forming a second step dynode facing a first step dynode with a material having such a property that secondary electrode irradiating ratio to applied voltage is almost saturated in an electron multiplier part of a photomultiplier. SOLUTION: A photomultiplier receives incident light with a photo-electric cathode 5 to irradiate a photo-electron, and sequentially cascade-multiplies irradiated photo-electron with a plurality of dynodes Dy in an electron-multiplier part 6. In the electron-multiplier part 6, a second step dynode Dy2 in which a photo-electron irradiated from a first step dynode Dy1 is formed with a material having such a property that secondary electron irradiating ratio to applied voltage is almost saturated. This material is either one of Al, Cu, Be, Ni, Fe, Mo, W, and stainless steel. The photomultiplier capable of retarding the generation of prepulse is obtained.
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公开(公告)号：JPH11224625A
公开(公告)日：1999-08-17
申请号：JP2588598
申请日：1998-02-06
Applicant: HAMAMATSU PHOTONICS KK
Inventor： OKADA TOMOYUKI , ITO MASUYASU , NAKAMURA KOJI , ISHIHARA YOSHITOSHI , NAKAMURA TSUTOMU , INATSURU TSUTOMU
Abstract: PROBLEM TO BE SOLVED: To provide an X-ray tube capable of shortening a distance from the generation point of an X-ray to the radiation window of the X-ray. SOLUTION: This X-ray tube is provided with an electron gun portion 2 emitting electrons, a target 4 receiving the radiated electrons from the electron gun 2 by a tip face 41 and generating X-ray radiation, an X-ray radiation window 32 provided in front of the tip face 41 of the target 4 and radiating the X-ray, and a hood electrode 5 of a cylinder body fitted to the tip portion of the target 4, having an electron passing port 52 and the electron passing port 52 being widened at least to the opposite side to the direction of the X-ray radiation window 32 against the passing position of the electrons.
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公开(公告)号：JPH07296751A
公开(公告)日：1995-11-10
申请号：JP8829994
申请日：1994-04-26
Applicant: HAMAMATSU PHOTONICS KK
Inventor： OKADA TOMOYUKI , ITO MASUYASU , NAKAMURA TSUTOMU , FURUKAWA MITSUMASA
Abstract: PURPOSE:To provide an X-ray tube device in which the distance from the generating point of X-ray to the X-ray taking window can be reduced. CONSTITUTION:In an X-ray tube device, the central axis of a first cylindrical member for housing an electron gun 110 is set substantially orthogonal to the central axis of a second cylindrical member for housing a target 211. A hood electrode 212 has, in the area from the end of a first directional side electron passing opening for taking the X-ray generated in the target to the first directional side end, a part having a focus grid directional diameter larger than the focus grid 113 directional diameter in a second directional area from the electron passing opening end on the second directional side which is opposite to the first direction.
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Patent Agency Ranking
公开(公告)号：JPH03254058A
公开(公告)日：1991-11-13
申请号：JP5340290
申请日：1990-03-05
Applicant: HAMAMATSU PHOTONICS KK
Inventor： KUSHIMA HIROYUKI , ITO MASUYASU , NAKAMURA KOJI , KURATA CHOMEI , NOGUCHI EIJI , ATSUMI AKIRA
IPC: H01J43/04
Abstract: PURPOSE:To simplify processing of leads and secure the welding operation with good performance by arranging a plurality of stem pins in line substantially, and arranging a plurality of leads on one plane approximately. CONSTITUTION:At a stem 18 in the form of a glass disc with an exhaust pipe 17 coupled in the center, approx. 20 stem pins 9 are fixed penetratively. These pins 9 are grouped for ex. five each to be in straight lines, to assume a square as a whole. The positions where the pins 9 are arranged shall be approx. flush with pattern wiring boards 14a, 14b, 14c welded to the body 13 of an electron tube concerned, and arrangement of the plane is determined by the potential. Leads 10... welded to the electron tube body 13 are welded to the stem pins 9... penetrating the stem 18. At this time, one of the welding rods 11a is put in contact with the insides of the stem pins 9... or leads 10... arranged in a row while the other welding rod 11b is moved bit by bit to perform welding.
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公开(公告)号：JPH0334242A
公开(公告)日：1991-02-14
申请号：JP16855889
申请日：1989-06-30
Applicant: HAMAMATSU PHOTONICS KK
Inventor： ITO MASUYASU , ISHIHARA YOSHITOSHI , TSUNODA TAKEO
IPC: H01J31/50
Abstract: PURPOSE:To enhance a reduction in electron orbit deflection by providing a deflection correcting anode electrode between a screen electrode and an anode electrode. CONSTITUTION:The electrons generated from the photoelectric surface of an input surface 2 according to the input of a subject image signal are focused and accelerated by focusing electrodes 41-43 and an anode electrode 51, and taken out from a screen electrode 3. A deflection correcting anode electrode 52 having nearly the same inclined surface as an electron orbit surface to which a potential lower than that to the electrode 51 is added is also provided between the electrodes 51 and 3. According to this simple constitution, an electron orbit deflection which is exponentially increased as it is closer to the periphery can be remarkably suppressed, and the whole deflection is reduced.
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公开(公告)号：JPH01265445A
公开(公告)日：1989-10-23
申请号：JP9527488
申请日：1988-04-18
Applicant: HAMAMATSU PHOTONICS KK
Inventor： KUSHIMA HIROYUKI , ITO MASUYASU , KURATA CHOMEI
Abstract: PURPOSE:To make it possible to insert the leg of an electrode so as to hold the electrode securely by providing holding holes to position a specific electrode to a specific position, and a leading hole to guide the leg of the electrode up to the position of the holding holes, to a hole. CONSTITUTION:A leading hole 34 to guide the leg 40 of an electrode up to the position of holding holes 35 and 36 is provided to a hole. Even though the leg 40 is at the position slipped from the slit-form of holding holes 35 and 36 at first, the tip of the leg 40 is slipped in the direction shown as F, and guided to the position of the slit-form of holding holes 35 and 36 by pushing the leg 40 to the hole, as far as the tip of the leg 40 is positioned in the leading hole 34. And, by pushing in the leg 40 further, the leg 40 can be inserted to the holding holes 35 and 36 and held stably. In this case, tapers 38 arranged around the hole make the slipping of the electrode tub smooth, and the leg 40 of the electrode can be guided to the position of the holding holes 35 and 36 easily.
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公开(公告)号：JPH05290793A
公开(公告)日：1993-11-05
申请号：JP8892292
申请日：1992-04-09
Applicant: HAMAMATSU PHOTONICS KK
Inventor： KUSHIMA HIROYUKI , HASEGAWA HIROSHI , ITO MASUYASU , TAKEUCHI JUNICHI , OBA KOICHIRO
Abstract: PURPOSE:To provide a photomultiplier capable of realizing the remarkable noise reduction, the reliable prevention of deterioration of an electron multiplier the prevention of generation of a gas at the time of fusing a glass and the remarkable improvement of workability at the time of manufacture. CONSTITUTION:A cylindrical side tube 2A for constituting a bulb 1A is made up of metal, and a flange-shape exposing air-tight welded part 2b made of metal is provided on the circumference of the lower part of the side tube 2A. A metal flange type air-tight welded part 11 welded to the air-right welded part 2b is provided on the circumference of a disc stem 4. Also, a metal gas discharge tube 7A is fused to the stem 4 by resistance welding and the metal gas discharge tube 7A is cut off by pinch-off sealing at the last step of the manufacturing process of a photomultiplier.
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公开(公告)号：JPH02291657A
公开(公告)日：1990-12-03
申请号：JP11144989
申请日：1989-04-28
Applicant: HAMAMATSU PHOTONICS KK
Inventor： KUSHIMA HIROYUKI , KIMURA SUENORI , ITO MASUYASU
Abstract: PURPOSE:To obtain an electron multiplier and a photo-electron multiplier which are highly efficient by correcting the orbits of secondary electrons emitted from dynodes in the first stage, enhancing a carry-over factor over to dynodes in the second stage, and thereby letting light decrease an electron running time difference to a great extent. CONSTITUTION:Potential between a net shaped electrode 61 in the first stage and a dynode 71, is made to be different roughly by -3V through -9V, an electron orbit t1 at the upper end 91 of an electrode element 9 is corrected, thereby disabling electron emission from the electrode 61 in the first stage. This therefore permits an electron running time difference T from an electron orbit t2 at the lower end 92 and an electron carry-over factor eta over to a dynode 72 in the second stage to be enhanced. This situation results in characteristics as shown by the figure wherein, for example, no change is made in the time difference T as far as the potential difference VC remains to be -0 to -2V, the time difference is gradually decreased when the potential difference is increased beyond -2V, it will be lowest when the potential difference is equal to -5V, and it will be hardly changed when the potential difference is equal to or more than -5V. On the other hand, a carry-over factor eta is moderately increased until the potential difference goes roughly up to -5V, and starts to be gradually decreased after the potential difference goes beyond said value. Namely, the most excellent characteristics are thereby exhibited when the potential difference VC is roughly equal to -5V.
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