WO2000034981A1 - Tube a decharge gazeuse et dispositif optique - Google Patents

Tube a decharge gazeuse et dispositif optique Download PDF

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Publication number
WO2000034981A1
WO2000034981A1 PCT/JP1999/006908 JP9906908W WO0034981A1 WO 2000034981 A1 WO2000034981 A1 WO 2000034981A1 JP 9906908 W JP9906908 W JP 9906908W WO 0034981 A1 WO0034981 A1 WO 0034981A1
Authority
WO
WIPO (PCT)
Prior art keywords
discharge tube
gas discharge
converging
light
electrode
Prior art date
Application number
PCT/JP1999/006908
Other languages
English (en)
Japanese (ja)
Inventor
Tomoyuki Ikedo
Original Assignee
Hamamatsu Photonics K.K.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hamamatsu Photonics K.K. filed Critical Hamamatsu Photonics K.K.
Priority to AU16821/00A priority Critical patent/AU1682100A/en
Publication of WO2000034981A1 publication Critical patent/WO2000034981A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/10—Shields, screens, or guides for influencing the discharge
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/68—Lamps in which the main discharge is between parts of a current-carrying guide, e.g. halo lamp

Definitions

  • the present invention relates to a gas discharge tube used as an ultraviolet light source or the like, and also relates to an optical device using a gas discharge tube for an analyzer such as a spectrophotometer or liquid chromatography.
  • the deuterium discharge tube used in the optical device described in this publication is a see-through type deuterium discharge tube that emits ultraviolet light before and after.
  • This deuterium discharge tube has a plate-shaped anode in a glass bulb, and a small hole is provided in the center of the anode. Ultraviolet rays are emitted from the front and rear of the bulb through the small holes. As a result, it is possible to obtain light in two directions from the front and the back from one tube, and it is possible to apply the present invention to a double beam optical system. Disclosure of the invention
  • the conventional deuterium discharge tube has a configuration in which ultraviolet light is emitted from the front and rear of the bulb through the small hole of the anode, the light emitted forward from the arc ball generating side of the anode and the small hole of the anode
  • the light that is emitted backward through the intervening light not only has a large difference in light amount, but also has a different noise characteristic (output fluctuation such as flicker drift). Therefore, it is difficult to use it in an optical system that requires two or more light beams of the same quality, and in particular, it is difficult to use it in an optical device that requires sample light and reference light.
  • the present invention has been made to solve the above-described problems, and in particular, to provide a gas discharge tube that emits a plurality of light beams of the same quality, and an optical device including the gas discharge tube. With the goal.
  • a gas discharge tube of the present invention includes a hot cathode for generating thermoelectrons, an anode for receiving thermoelectrons, and a converging device for disposing thermoelectrons between the hot cathode and the anode.
  • this gas discharge tube it is possible to obtain two or more luminous fluxes of the same direction directed in the same direction, and it is possible to easily and reliably produce two or more highly versatile high-quality lights. .
  • a round hole having a diameter of 0.5 mm is a general limit due to an increase in a discharge starting voltage or occurrence of an abnormal discharge.
  • the present invention is a technical idea that can improve the lighting performance of the gas discharge tube while promoting the increase in the spot of each light beam by positively reducing each convergent aperture.
  • the plurality of converging apertures are provided on the same plane.
  • a plurality of arc balls are generated side by side on the same plane.
  • At least one of the plurality of converging openings is formed in a slit shape. This makes it possible to obtain a light beam having an elongated cross section.
  • At least one of the plurality of converging apertures is formed in a square shape. This thus, a light beam having a square cross section can be obtained.
  • At least one of the plurality of converging openings is formed in a round hole shape. Thereby, a beam light having a circular cross section can be obtained.
  • At least one of the plurality of converging apertures is formed in an elliptical shape.
  • a beam light having an elliptical cross section can be obtained.
  • the plurality of converging apertures have the same shape as each other.
  • a part of the focusing electrode exists between the plurality of focusing apertures.
  • the shortest distance between the plurality of converging apertures is within 1 mm. This is because if the distance between the convergent apertures is too far, the arc ball is likely to develop, and the size of each arc ball may be extremely different.
  • the optical device of the present invention includes the gas discharge tube having the above-described configuration.o
  • This optics allows for widespread use in analytical instruments where small power fluctuations are a problem, such as, for example, spectrophotometers and high-performance liquid chromatographs (HPLC).
  • the gas discharge tube provided as a light source in this optical device can improve the lighting performance of the gas discharge tube while positively reducing the size of each converging aperture to promote a high spot of each light flux. Therefore, it can be easily applied to ultra-trace analysis such as capillary electrophoresis.
  • FIG. 1 is a perspective view showing one embodiment of the gas discharge tube according to the present invention.
  • FIG. 2 is an exploded perspective view of a light emitting unit in the gas discharge tube of FIG.
  • FIG. 3 is a perspective view showing a state before assembling a support plate and an anode in the light emitting unit of FIG.
  • FIG. 4 is a perspective view showing a state before assembling the discharge shielding plate and the anode in the light emitting unit of FIG.
  • FIG. 5 is a plan view showing a positional relationship among a discharge shielding plate, an anode, and a support plate in the light emitting unit of FIG.
  • FIG. 6 is a sectional view taken along the line VI-VI of FIG.
  • FIG. 7 is a sectional view taken along the line VII-VII in FIG.
  • FIG. 8 is a perspective view showing a first example of the aperture limiting plate applied to the gas discharge tube of the present invention.
  • FIG. 9 is a plan view of the aperture limiting plate shown in FIG.
  • FIG. 10 is a cross-sectional view taken along line XX of FIG.
  • FIG. 11 is a sectional view taken along the line XI—XI of FIG.
  • FIG. 12 is a perspective view showing a second example of the aperture limiting plate applied to the gas discharge tube of the present invention.
  • FIG. 13 is a sectional view taken along the line XIII—XIII in FIG.
  • FIG. 14 is a schematic diagram showing a first optical system applied to the optical device according to the present invention.
  • FIG. 15 is a schematic diagram showing a second optical system applied to the optical device according to the present invention.
  • FIG. 16 is a schematic diagram showing another example of the convergent aperture.
  • FIG. 17 is a schematic diagram showing another example of the convergent aperture.
  • FIG. 18 is a schematic diagram showing another example of the convergent aperture.
  • FIG. 19 is a schematic view showing another example of the convergent aperture.
  • FIG. 20 is a schematic diagram showing an example in which three converging apertures are arranged.
  • FIG. 1 shows a side-on type deuterium lamp as an example of a gas discharge tube.
  • a light-emitting portion 20 is housed inside a glass envelope 11, and a deuterium gas (not shown) is sealed in at a rate of about several Torr.
  • the bottom of the envelope 11 formed into a cylindrical shape by sealing the top is hermetically sealed by a glass stem 12.
  • the envelope 11 is made of an ultraviolet transmitting glass, a quartz glass, or the like having a good ultraviolet transmittance.
  • the light emitting part 20 is assembled in a shielding box structure in which a ceramic supporting plate 22 and a metal front window electrode 23 are bonded together with a ceramic discharging shielding plate (spacer) 21 interposed therebetween. Have been.
  • the support plate 22 having a prism shape with a convex cross section has a longitudinal through hole 220, a concave groove 22 1 to 22 3, a concave portion 2 24, and 4. There are formed two convex portions 2 25 and four lateral through holes 2 26.
  • the vertical through hole 220 penetrates vertically through the raised portion 22A behind the support plate 22 having a convex cross section.
  • the concave groove 2 2 1, the concave 2 2 4, and the concave grooves 2 2 2, 2 2 3 are depressed from the surface of the front flat plate portion 2 2 B. Both extend sequentially toward the bottom of the envelope 11.
  • the four convex portions 2 25 are formed two by two in the vicinity of the opening edges of the concave grooves 2 2 1 and 2 2 2 so as to face each corner of the anode 2 4. It protrudes from the surface.
  • the four horizontal through-holes 226 extend in the horizontal direction, and penetrate at two locations at the upper end and the lower end.
  • the support plate 22 is held by the stem 12 via a lead pin 13 passing through the vertical through hole 220 and a lead pin 14 housed in the concave groove 22 1 to 22 3. .
  • the anode 24 formed into a rectangular plate shape is fixed to the tip of the lead pin 14 by welding, and is supported from the back surface by four projections 22. Behind the anode 24, a heat radiating space is secured by a concave portion 224, which has an opening substantially equal to the surface area of the anode 24.
  • the discharge shielding plate 21 formed into a flat plate has a thinner and wider cross-sectional convex shape than the support plate 22, and has a through hole 210 and a concave portion.
  • 2 1 1, vertical through hole 2 1 2, 4 horizontal through holes 2 1 3, 2 horizontal through holes 2 1 4, and 4 horizontal through holes 2 15 .
  • the through hole 210 penetrates substantially the center of the discharge shielding plate 21 so as to face the anode 24.
  • the recessed portion 211 is recessed from the surface of the flat plate portion 21A on the back side of the discharge shielding plate 21 to accommodate the anode 24, and the first recessed portion located on the back side of the through hole 210. Opening edge.
  • the vertical through hole 2 1 2 penetrates the front raised portion 2 1B.
  • the four lateral through holes 2 13 extend in the horizontal direction, and face the four lateral through holes 2 26 of the support plate 22.
  • the two horizontal through holes 2 14 in the discharge shielding plate 21 are formed at positions for accommodating the locking claws 27 1 of the cathode slit electrode 27 described later, and the four horizontal through holes 2 1 Reference numeral 5 is formed at a position for accommodating a locking claw 2 31 of the front window electrode 23 described later.
  • Electrode rods 250 and 251, respectively, are welded to both ends of the hot cathode (filament) 25.
  • the tip of the electrode rod 250 is welded to the electrode rod 2 16, and the tip of the electrode rod 25 1 is welded to the tip of the lead pin 16. In this way, the hot cathode 25 is held on the stem 12.
  • the rectangular anode 24 shown by the broken line is accommodated in the recessed portion 211 of the discharge shield plate 21, and each corner of the anode 24 is formed by the discharge shield plate 21.
  • the discharge shield plate 21 are held in cooperation with the bottom surface of the concave portion 2 11 and the four convex portions 2 25 of the support plate 22.
  • Most of the four sides of the anode 24 coincide with the rounded, substantially rectangular through hole 210, and the other part of the first opening edge is joined to the four corners of the anode 24 are doing.
  • the four convex portions 222 having a circular surface are joined to the four corner portions of the anode 24 and press the anode 24.
  • the rectangular depression 2 11 has a depth corresponding to the sum of the height of the four projections 2 25 and the thickness of the anode 24, and as a result, The outer peripheral edge formed on the front surface of the support plate 22 can be brought into contact with the back surface of the discharge shielding plate 21.
  • a focusing electrode 26 formed by bending a metal plate into a substantially L-shape has an opening 260 and four lateral through holes 263.
  • the opening 260 is arranged coaxially with the through hole 210 of the discharge shielding plate 21.
  • An opening limiting plate 261 for limiting the opening diameter is welded to a region around the opening 260.
  • the opening limiting plate 26 1 is provided with an arc ball receiving recess 52 projecting toward the anode 24 so as to pass through the opening 260.
  • two slit-shaped convergent openings 40 having the same shape are provided in parallel.
  • the four horizontal through holes 26 3 extend in the thickness direction of the focusing electrode 26 and face the four horizontal through holes 2 13 of the discharge shielding plate 21.
  • the focusing electrode 26 is provided so as to be in contact with the protruding portion 21 B of the discharge shielding plate 21, and the tip 26 A bent backward and the lead pin protruding from the support plate 22 are provided. 13 is welded to the tip. In this way, the focusing electrode 26 is fixed to the discharge shielding plate 21 and the support plate 22.
  • the distance between the opening limiting plate 26 1 and the anode 24 is smaller than the thickness of the discharge shielding plate 21.
  • the horizontal through holes 2 26, 21 3, and 26 3 of the discharge shield plate 21, the support plate 22, and the focusing electrode 26 are respectively aligned in a straight line.
  • the metal cathode slit electrode 27 is bent in accordance with the shape of the step region of the discharge shielding plate 21, and the opening 27 It has stop claws 2 7 1.
  • An opening 270 shaped into a vertically long rectangle is formed at the front of the cathode slit electrode 27.
  • the two locking claws 2 71 formed on the upper and lower ends of the cathode slit electrode 27 are bent rearward.
  • the cathode slit electrode 27 is opposed to the hot cathode 25 and is set on the front surface on one side of the discharge shield plate 21, and the two locking claws 27 1 are connected to the two pieces of the discharge shield plate 21. It is fixed to the discharge shielding plate 21 by being inserted into the horizontal through hole 2 14. Note that the opening 270 is arranged between the hot cathode 25 and the opening limiting plate 261.
  • the metal front window electrode 23 has a substantially U-shaped cross section bent in four steps, and also has an opening window 230 and four locking claws 2 31.
  • the opening window 230 formed in a rectangular shape is arranged coaxially with the arc ball accommodating recess 52 of the focusing electrode 26.
  • Four locking claws 2 31 formed on the upper and lower sides of both sides of the front window electrode 23 project rearward.
  • the opening window 230 is disposed at a position where ultraviolet rays are projected from the space in front of the arc ball housing recess 52.
  • the front window electrode 23 is fixed to the discharge shielding plate 21 by inserting four locking claws 2 31 into the four lateral through holes 2 15 of the discharge shielding plate 21.
  • the front end of the cathode slit electrode 27 By bringing the front end of the cathode slit electrode 27 into contact with the inner surface of the front window electrode 23, the space for disposing the hot cathode 25 and the light emitting space for generating arc discharge can be separated. Can be.
  • the focusing electrode 26 has a discharge shielding plate 21 with respect to the cathode slit electrode 27 and the front window electrode 23. Electrically insulated via On the other hand, the cathode slit electrode 27 and the front window electrode 23 are in contact with each other and are set to the same potential.
  • the focusing electrode 26 is electrically insulated from the cathode slit electrode 27 and the front window electrode 23, the cathode slit electrode 27 and the front window electrode set to almost 0 V potential. A positive potential higher than 23 can be generated at the focusing electrode 26. Therefore, as shown in FIG. 6, a trigger discharge region 30 is generated so as to extend from the hot cathode 25, and this trigger discharge region 30 is a space surrounded by the front window electrode 23 and the cathode slit electrode 27, That is, it expands from the inside of the cathode box and reaches the converging electrode 26.
  • a trigger discharge is generated between the hot cathode 25 and the aperture limiting plate 261, and as a result, a flat arc ball Y is generated in front of each converging aperture 40.
  • Ultraviolet light extracted from each arc ball (that is, positive pole emission) Y is emitted as slit light through the opening window 230 of the front window electrode 23.
  • the aperture limiting plate 261 provided on the focusing electrode 26 has a rectangular flat substrate 51 made of molybdenum which is a high melting point metal.
  • an arc ball accommodating recess 52 formed by press-molding the substrate 51 is provided.
  • the arc ball converging concave portion 52 has a substantially semi-cylindrical shape whose inner surface 52 a is formed in an arc-shaped cross section that expands outward. More specifically, the radius R 1 of the inner surface 52 a of the arc recess accommodating recess 52 is about 1.5 mm.
  • the opening 52b of the arc ball receiving recess 52 is formed in a rectangular shape, the width W1 is about 3.0 mm, and the length L1 is about 4.0 mm.
  • a rectangular flat portion 54 having a width P 1 of about 1.0 mm and a length El of about 2.0 mm is formed at the bottom of the arc ball receiving recess 52.
  • the size of the substrate 51 is 8 ⁇ 8 mm and the thickness thereof is about 0.3 to 0.7 mm. I have.
  • a high melting point metal such as tungsten may be used as the material of the opening limiting plate 261.
  • two slit-shaped converging openings 40 are formed side by side so as to extend in the longitudinal direction. It is preferable that the convergent apertures 40 of the same shape have an aperture length A in the longitudinal direction of 1.0 mm and an aperture length (width) B in the direction orthogonal to the longitudinal direction of 0.1 mm. . Further, the shortest distance V between the respective converging apertures 40 is preferably within 1 mm. The reason for this is that if the convergent apertures 40 are too far apart, the arc ball Y tends to develop, and the size of the left and right arc balls Y may be extremely different.
  • each arc ball Y develops in front of each converging aperture 40 as a uniform and high-brightness one, and two slit-shaped light beams are generated simultaneously.
  • the width B of each of the two converging apertures 40 will be considered. For example, If the width of the lit convergent aperture 40 is smaller than 0.15 mm, the discharge impedance increases, and high energy is required to start discharge. If the energy is set too high, the gas discharge tube may not be turned on due to abnormal discharge. On the other hand, it has been experimentally confirmed that the double-slit convergent aperture 40 is lit even if each width B is smaller than 0.15 mm. This is because the sum of the opening areas can be kept large even if the opening areas of the individual converging openings 40 are made small. As a result, it is possible to secure a stable discharge start.
  • FIGS. 12 and 13 show the configuration of another aperture limiting plate 60.
  • the aperture limiting plate 60 has a rectangular flat substrate 62 made of molybdenum which is a high melting point metal.
  • a cup-shaped arc ball receiving recess 63 created by press-molding the substrate 62 is provided.
  • the arc-ball converging concave portion 63 has a substantially hemispherical shape whose inner surface 63a is formed in an arc-shaped cross section which bulges outward.
  • the radius R 2 of the inner surface 63 a of the arc ball housing recess 63 is about 2.0 mm.
  • the opening 63b of the arc ball accommodating recess 63 is formed in a circular shape, and has a diameter D of about 4.0 mm. Further, a flat portion 61 having a radius of about 1.0 mm is formed at the bottom of the arc ball housing recess 63. In the center of the flat portion 61, two circular converging openings 64 are formed.
  • the diameter of the circular convergent aperture 64 can be smaller than a conventionally known round hole having a diameter of 0.5 mm, and the diameter is preferably 0.35 mm. This is achieved by forming a plurality of converging apertures 64.
  • the optics allow for widespread use in analytical instruments where small power fluctuations are a problem, such as spectrophotometers and high performance liquid chromatographs (HPLC).
  • the gas discharge tube 10 described above has a structure in which each convergent aperture is positively reduced so that each luminous flux is reduced. It can improve the lighting performance of a gas discharge tube while promoting the increase in spot size, and can be easily applied to ultra-trace analysis such as in capillary electrophoresis.
  • the cells of analyzers have become smaller and smaller, and a small point light source has been required. Therefore, the gas discharge tube 10 shown in the above-mentioned embodiment sufficiently satisfies such a demand.
  • the gas discharge tube 10 that generates a plurality of luminous fluxes can be applied to various optical systems.
  • two beams in the same direction emitted from the gas discharge tube 10 pass through the concave mirror M and enter the entrance slit SL1. Focused on top.
  • Each light that has passed through the slit SL1 is split into monochromatic light having a predetermined wavelength by the concave diffraction grating G. Then, one light that has passed through the slit SL2 is used as sample light, and the other light is used as reference light.
  • the sample light After passing through the sample analysis cell C, the sample light is received by the photodetector S composed of a photodiode or a photomultiplier tube.
  • the reference light is directly received by a photodetector R comprising a photodiode or a photomultiplier tube.
  • two light beams emitted in the same direction from one gas discharge tube 10 are divided into a sample light and a reference light immediately after the emission, and are used for different purposes.
  • the analyzer 80 of the multi-beam optical system two light beams emitted from the gas discharge tube 10 are incident on the entrance slit SL 3 via the concave mirror M 1. It is collected. Each light that has passed through the slit SL3 is distributed to two optical paths by the beam split mirror M2. Light traveling on one of the optical paths is split into monochromatic light of a predetermined wavelength by the convex diffraction grating G1. This light is divided into sample light and reference light by the half mirror HF1. After passing the sample analysis cell C1 through the slit SL4, the sample light is received by the photodetector S1 composed of a photodiode or a photomultiplier tube. In addition, the reference light that has passed through the slit SL 5 is converted to a photodiode or photomultiplier. The light is directly received by the photodetector R1 consisting of a tube.
  • the beam split mirror M2 Similarly, light traveling on the other optical path distributed by the beam split mirror M2 is split into monochromatic light of a predetermined wavelength by the convex diffraction grating G2. Then, this light is divided into sample light and reference light by the half mirror HF2.
  • the sample light passes through the sample analysis cell C2 through the slit SL6, and is received by the photodetector S2 including a photodiode or a photomultiplier tube.
  • the reference light having passed through the slit SL7 is directly received by the photodetector R2 including a photodiode or a photomultiplier.
  • the multi-beam optical system enables simultaneous measurement of two samples, and has twice the measurement capability as compared with the conventional optical system, thus enabling a significant reduction in measurement time.
  • the number of light beams emitted from the gas discharge tube 10 is set to three or more, three or more samples can be measured simultaneously, and such a technique is particularly useful for a multi-channel detector.
  • the gas discharge tube and the optical device according to the present invention are not limited to the embodiments described above, and various modifications are possible.
  • the slit-shaped converging aperture 40 may be formed in an arbitrary square shape such as a square as shown in FIG. 16 or a diamond as shown in FIG.
  • the round hole-shaped convergent opening 64 may be formed in an elliptical shape as shown in FIG.
  • the elliptical shape includes a shape in which the ellipse shown in FIG. 19 is elongated in the major axis direction.
  • the number of converging openings of the gas discharge tube is not limited to two, and three or more converging openings may be arranged in a line or in a matrix as shown in FIG. In this case, it is preferable that the shortest distance V between the respective converging apertures 40 is within l mm.
  • the shapes of the converging apertures do not need to be all the same, and all or some of them may be made different. Examples of different shapes include different diameters of round holes, The width and the length of the lit convergent opening may be made different.
  • optical system used in the optical device is appropriately changed according to the number of light beams.
  • a side-on type deuterium lamp has been described.
  • the present invention relates to a head-on type deuterium lamp as described in, for example, FIG. 9 and FIG. 10 of US Pat. It can also be applied to a type of deuterium lamp.
  • the focusing electrode since the focusing electrode has a plurality of focusing apertures, a plurality of light beams of the same quality can be emitted. Further, in this gas discharge tube, even when the opening area of each convergent opening is made small, the total sum of the opening areas can be kept large, so that a stable discharge start can be secured. Therefore, it is possible to improve the lighting performance of the gas discharge tube while promoting the increase of the spot of each light beam by making each convergent aperture smaller actively.

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Abstract

Une électrode convergente dans un tube à décharge gazeuse comporte plusieurs ouvertures convergentes, ce qui permet la production d'au moins deux flux lumineux de même qualité, orientés dans le même sens et formant simplement et positivement au moins deux faisceaux lumineux de flexibilité et de qualité élevées. Par ailleurs, étant donné que le tube à décharge gazeuse peut être doté d'une zone d'ouverture totale importante même lorsque la dimension des zones d'ouvertures convergentes séparées est réduite, un démarrage de décharge stable peut être assuré. Ainsi, les performances d'éclairage du tube à décharge gazeuse peuvent être améliorées alors que la dimension des ouvertures convergentes séparées est réduite positivement et qu'une caractéristique d'éclairage local supérieure de chaque flux lumineux est favorisée.
PCT/JP1999/006908 1998-12-09 1999-12-09 Tube a decharge gazeuse et dispositif optique WO2000034981A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU16821/00A AU1682100A (en) 1998-12-09 1999-12-09 Gas discharge tube and optical device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10/350438 1998-12-09
JP10350438A JP2000173546A (ja) 1998-12-09 1998-12-09 ガス放電管及び光学装置

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WO2000034981A1 true WO2000034981A1 (fr) 2000-06-15

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AU (1) AU1682100A (fr)
WO (1) WO2000034981A1 (fr)

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Publication number Priority date Publication date Assignee Title
JP4986509B2 (ja) * 2006-06-13 2012-07-25 株式会社オーク製作所 紫外連続スペクトルランプおよび点灯装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04147557A (ja) * 1990-10-11 1992-05-21 Hitachi Ltd 重水素放電管
JPH06310101A (ja) * 1993-04-21 1994-11-04 Hitachi Ltd 重水素放電管
JPH076736A (ja) * 1993-06-17 1995-01-10 Hitachi Ltd 重水素ランプ
EP0727812A2 (fr) * 1995-02-17 1996-08-21 Hamamatsu Photonics K.K. Tube à décharge dans un gaz

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04147557A (ja) * 1990-10-11 1992-05-21 Hitachi Ltd 重水素放電管
JPH06310101A (ja) * 1993-04-21 1994-11-04 Hitachi Ltd 重水素放電管
JPH076736A (ja) * 1993-06-17 1995-01-10 Hitachi Ltd 重水素ランプ
EP0727812A2 (fr) * 1995-02-17 1996-08-21 Hamamatsu Photonics K.K. Tube à décharge dans un gaz

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AU1682100A (en) 2000-06-26

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