WO2006121173A1 - 電離真空計 - Google Patents
電離真空計 Download PDFInfo
- Publication number
- WO2006121173A1 WO2006121173A1 PCT/JP2006/309612 JP2006309612W WO2006121173A1 WO 2006121173 A1 WO2006121173 A1 WO 2006121173A1 JP 2006309612 W JP2006309612 W JP 2006309612W WO 2006121173 A1 WO2006121173 A1 WO 2006121173A1
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- WO
- WIPO (PCT)
- Prior art keywords
- grid
- ion collector
- vacuum
- ionization
- vacuum gauge
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L21/00—Vacuum gauges
- G01L21/30—Vacuum gauges by making use of ionisation effects
- G01L21/32—Vacuum gauges by making use of ionisation effects using electric discharge tubes with thermionic cathodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J41/00—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas; Discharge tubes for evacuation by diffusion of ions
- H01J41/02—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas
- H01J41/04—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas with ionisation by means of thermionic cathodes
Definitions
- the present invention relates to an ionization vacuum gauge for measuring the gas molecule density, ie, pressure, of gas molecules in a vacuum apparatus. Background technology.
- This ionization vacuum gauge is called the Bayard-Alpert type ionization vacuum gauge (hereinafter referred to as BA type). It is usually the most popular ionization vacuum gauge that can measure a very wide pressure range of 0.1 Pa to l (T 9 Pa). is there.
- This ionization vacuum gauge has three electrodes, a grid 2, an electron source 3, and an ion collector I 5 inside a vacuum vessel 4 connected in a connected state to a vacuum apparatus, and the electrons emitted from the electron source 3 Is vibrated in and out of the grid 2, the gas molecules flying into the grid 2 are ionized by the vibrating electrons, and the ionized ions are captured by the ion collector 1 and converted into a current signal.
- 1 0, reference numeral 4 5 mounting flange, 8 minute ammeter, 1 1 current introducing terminals of the ion collector, 2 1, 2 1 5 cable terminal glyceraldehyde Tsu de, 2 2 grid 3 1, 3 1 ′ is a current introduction terminal for the hot cathode filament, and 3 2 is a filament heating power source.
- Grid 2 (sometimes called an electron collector) is formed in a spiral shape or a wire mesh shape, and a hot cathode filament 3 that is an electron source is generally arranged on the outside thereof. It is.
- a needle-shaped ion rect evening 1 is arranged in the center of 'grid 2'.
- the potential applied to each electrode is usually the grid potential (power supply 3 3 And the power supply 2 3) are 150 V to: L80 V, the filament potential (power supply 3 3) is 30 V to 50 V, and the ion collector ⁇ is placed at the ground potential.
- the vacuum device In recent manufacturing industries that use vacuum, in order to produce higher quality industrial products, the vacuum device is evacuated to the ultra-high vacuum region, and then vacuum deposition (pressure rises) or argon gas is used. In many cases, it is used to perform spattering and to introduce device creation gas, and since it reciprocates between open air and ultra-high vacuum, the BA type ionization vacuum gauge in Fig. 10 has a wide measurement pressure range. The importance of is getting higher and higher.
- this ionization vacuum gauge when repeatedly released into the atmosphere, and in an environment with a gas composition containing pollutant molecules (often organic). If it is used, the sensitivity S of the ionization gauge will decrease, resulting in a problem that accurate pressure measurement cannot be performed. For this reason, there are variations in products manufactured using vacuum, and defective products appear. Inaccuracy in pressure measurement using an ionization vacuum gauge has become a major problem in the industry. For this reason, uneconomical methods such as periodically replacing the gauge of the ionization gauge are used. However, even if such a method is adopted, the sensitivity is always decreasing during the period until replacement, and there is no change in the fact that correct pressure measurement is not performed.
- This decrease in sensitivity S is considered as follows. That is, if there is a gas molecule of pollutant with high adsorptivity, it adsorbs to the grid 2 of the ionization vacuum gauge, and the adsorbed molecule is subjected to electron impact, decomposes and solidifies on the surface of the grid. The material becomes difficult to conduct electricity, making it difficult for electrons to flow into the grid, disturbing the electron current of I e in equation (1), and lowering the sensitivity o
- one of the present inventors has disclosed a method for suppressing the adsorption of the pollutant gas molecules for the purpose of preventing the adsorption of electron impact desorption molecules (Japanese Patent Laid-Open No. 2000-39375). .
- the heat generated when the electrons emitted from the filament collide with the grid, and the grid is heated to about 120 ° C without any means for independent heating.
- the contaminating molecules that become electron impact desorption can still be adsorbed. Further 600 per temperature above 200 ° C. Over C, the adsorption of contaminating molecules that become electron impact desorption decreases. Therefore, it is known that it is important to set the temperature to suppress the adsorption of contaminants on the metal surface to 200 ° C or higher.
- a large current of 12A to 15A can be applied to the grid to achieve a temperature of 1000 ° C where degassing can be expected. It is necessary to use a thick terminal that can flow a large current.
- the grid can be decontaminated to some extent.
- none of the methods is a method of constantly heating, and it is not a method that allows the temperature of grid 2 to be freely changed.Therefore, if the sensitivity decreases during measurement, the pressure is increased accordingly. Obviously, the pressure measurement is low and wrong.
- Contamination on the grid is contamination caused by the phenomenon of adsorbed molecules being decomposed ⁇ ), whereas contamination on the ion collector is contamination due to sedimentation, and the quality of the contamination is fundamentally different. That is, polluting gas molecules are Due to the collision, it is decomposed into active pollutant molecules and active pollutant atomic ions in the space in the grid, and since these decomposed ions are often positive ions, the ion collector is at the ground potential. It is easily drawn to.
- the format is mainstream. For this reason, since a large amount of ions gathers at the needle part with a small surface area, the surface is easily covered with contaminants if the type of ions includes the contaminants ION. Furthermore, since the temperature of the ion collector cannot be controlled, the temperature is less than 100 ° C, which is warmed by radiant heat from the filament, so pollutant ions are easily deposited. When the insulator film grows due to this deposition, ions gathered in the ion collector later cannot receive electrons, so they stay on the surface of the ion collector with a plus, and then enter. Bounce off the ion. This is the cause of the decrease in sensitivity.
- this ionization vacuum gauge is an ionization vacuum gauge that collects positive ions generated in the donut space between the grid and the ion collector in a cylindrical ion collector and measures the pressure.
- Measurement is possible from lOOPa pressure, which is more than two orders of magnitude higher than the BA ionization vacuum gauge. Since the ion collector is cylindrical and has a very large surface area, the change in sensitivity over time due to contamination is small compared to the B.A ionization gauge, and has excellent characteristics.
- this triode-type ionization gauge has a pressure measurement limit inherent to the ionization gauge called the X-ray limit, which is as high as l (V 6 Pa), and pressure measurement in the ultra-high vacuum region cannot be performed.
- the BA ionization gauge is an ionization gauge invented by Bayard and Alpert in 1950 to improve this X-ray limit to the l (V 9 Pa level). The smaller the surface area of the ion collector, the lower the X-ray limit, but it can be said that the effect on contamination tends to increase.
- the upper limit of pressure measurement of an ionization gauge is about lPa when using a BA-type ionization gauge, and about lOOPa when using a triode-type ionization gauge.
- Pressure not only loses its function as an ionization gauge, but is also susceptible to damage from hot cathode filament oxidation. Therefore, when measuring pressures higher than this, the Billani gauge is used, in which the amount of heat taken from the heated wire is proportional to the gas pressure.
- the concept of using the electrode in the ionization vacuum gauge to provide a function as a Villa vacuum gauge has already been disclosed and publicly known.
- Japanese Laid-Open Patent Publication No. 10-213509 discloses a method for measuring the pressure on the high pressure side by lowering the temperature of the hot cathode filament of the ionization vacuum gauge and performing the action of the double vacuum gauge.
- Japanese Patent Laid-Open No. 2000-329634 discloses a method for operating a head as a filament of a vacuum gauge. These methods have their own problems. When the filament has the function of a Pirani gauge, the surface of the filament is stable. Must be surface.
- Patent Document 1 Japanese Patent Application Laid-Open No. Hei 10-0-2 1 3 5 9
- Patent Document 2 Japanese Patent Laid-Open No. 2 00 0-3 9 3 7 5
- the ion collector surface adsorbs the positive ions of the decomposition material generated from the pollutant, and an insulating pollutant thin film is formed on the ion collector surface. Therefore, it is necessary to devise an ionization vacuum gauge that embodies a method that does not cause this phenomenon.
- an ionization vacuum gauge was invented that embodies a method for expanding the measurable range of one ionization vacuum gauge from 10 ' 9 Pa to lOOPa and a practical method for measuring pressure from atmospheric pressure to l-100 Pa. There is a need to.
- an object of the present invention is to provide an ionization gauge equipped with a heating device for heating the ion collector. Disclosure of the invention
- the present invention comprises at least three electrodes, a grid, an electron source, and an ion collector, inside a vacuum vessel connected in communication with a vacuum device, and the electrons emitted from the electron source are supplied to the grid. Vibrating inward and outward, gas molecules flying into the grid are ionized by the vibrating electrons, and the ionized ions are captured by an ion collector and converted into a current signal.
- the ionization vacuum gauge for measuring the gas molecule density (pressure) the ion collector is provided with a heating device for heating the ion collector.
- the problem can be solved by creating conditions that do not cause adsorption of contaminant molecules and decomposition molecules.
- the ion collector is made into one wire, both ends are connected to two current introduction terminals, and the atmosphere side of the current introduction terminal is used to heat the ion collector. Since it is possible to raise the temperature of the ion collector by energizing with means that can be connected to the power supply, it is possible to create conditions under which contaminant molecules do not adsorb. In this case, adsorption can be suppressed by raising the temperature of the ion collector to 200 ° C or higher.
- the measurement current when measuring the ion current collected in the ion collector is a direct current measurement of 1 pA (picoampere) to 1 ⁇ A (microampere), but this current measurement is not affected.
- the problem can be solved by configuring an electric circuit that does not interfere with ion current measurement by the electromagnetic induction heating method.
- Another method with a small load on the vacuum terminal that heats the ion collector and grid by the current heating method is to place a high-frequency coil in an insulator vacuum vessel, and place a high-frequency coil on the atmosphere side.
- the measurement limit on the high pressure side of the BA-type ionization vacuum gauge is about 10 ⁇ 1 Pa, but if the BA-type ion collector is changed to a structure that heats the current, the ion collector can be reversed as a hot cathode filament. If a new cylindrical electrode is provided outside the grid and this cylindrical electrode is used as the ion collector of a three-pole ionization vacuum gauge, the BA ionization vacuum gauge can be switched by simply switching the switch. It is possible to provide an ultra-wide ionization gauge with both the functions of a triode ionization gauge, that is, a pressure measurement range of l (r 9 Pa to 100 Pa.
- the filament wire diameter is 0.2 mm or less and the surface has a metal surface.
- one method is to make the ion collector a single wire, connect both ends to the two current introduction terminals, and connect this collector to the resistor of the Villa vacuum gauge. By using it as an ionization gauge, it becomes possible to give the function of the Villa vacuum gauge to the ionization gauge.
- the ionization vacuum gauge According to the ionization vacuum gauge according to the present invention, it is possible to always maintain a clean surface by raising the temperature of the ion collector, for example, by energization, so that it is formed in the grid. Therefore, positive ions proportional to the pressure can be reliably captured and detected as ion currents. Therefore, correct pressure measurement is always possible even in a vacuum region where contaminant molecules are generated. In addition, since the grid can be measured while being heated at the same time, the electron current can be controlled with high accuracy, and the accuracy of pressure measurement is dramatically improved.
- the ion collector can be diverted as a hot cathode filament of a triode ionization vacuum gauge, it is possible to continuously measure pressures of 0.1 Pa or higher with the same vacuum gauge. Of course, it is economically advantageous, and the pressure measurement range can be expanded to 100 Pa.
- FIG. 1 is a BA type ionization vacuum gauge according to a specific example of the present invention.
- Figure 2 shows the ion collector temperature and grid temperature due to energization (alternating current), and the values in the graph indicate power (watts).
- FIG. 3 shows a probe of an extractor type ionization vacuum gauge according to a specific example of the present invention.
- Fig. 4 shows a part of a sensor of a quadrupole mass spectrometer in which the present invention is applied to a total pressure measuring electrode.
- Figure 5 shows a B A type ionization gauge gauge placed horizontally against the flange.
- Fig. 6 shows a specific example of a BA type ionization gauge gauge using a heating method using high-frequency coupling and a part of the heating power supply.
- FIG. 7 is a specific example of a BA type ionization vacuum gauge according to the present invention that can be diverted to a triode ionization vacuum gauge.
- FIG. 8 is a specific example in the case where the collector electrode of the present invention is used as a resistor for a Villa vacuum gauge.
- FIG. 9 is a configuration diagram of the vacuum exhaust apparatus used in the investigation of the present invention.
- FIG. 10 is a diagram showing a conventional BA-type ionization vacuum gauge. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 shows an example in which a BA type ionization gauge according to the present invention is attached to a vacuum apparatus (not shown).
- Grid 2 has a tantalum wire with a diameter of ⁇ 0.3 mm in a spiral shape with an inner diameter of 6 mm.
- One end of the spiral wire is connected to the current introduction terminal 21, and the other end is connected to another current introduction terminal 2 1 ′ via the support wire 20.
- the two terminals are connected to a variable voltage AC power source 22 for heating the grid.
- this size of grid 2 is approximately 500 ° C when a current of 1.4 A (2.3 W) flows through grid 2 and 1000 ° C when a current of 2.6 A (10.5 W) flows.
- the temperature can be raised independently.
- the numbers attached to each point in Fig. 2 indicate the number of watts of power, and the temperature for this current and power is spot welded with an R-type thermocouple with a wire diameter of 0.05 mm approximately at the center of the darlid 2. It is obtained at the time of use.
- Filament 3 is a iridium wire with a diameter of ⁇ 0.127mm bent into a hairpin shape and sintered with yttrium oxide powder on its surface. It is connected to the current introduction terminals 3 1 and 3 1 '. It is connected. A flame heating AC power source 3 2 is connected to the two terminals to raise the temperature of filament 3 to a temperature at which electrons can be emitted, and the heating power source 3 2 is adjusted so that a constant electron current is emitted. Is done.
- a rhenium wire having a diameter of ⁇ 0.175 mm is bent into a hairbine shape and arranged at the center of the grid, and both ends thereof are connected to independent current introduction terminals 1 1 and 1 1 ′.
- the secondary coil 5 "is connected to a microammeter 8 positioned at the ground voltage via a choke coil 7 that attenuates an AC signal.
- An AC power supply 6 is connected to the primary coil 5 of the isolation transformer 5 and the temperature of the ion collector 1 is adjusted independently by changing the current flowing by electromagnetic induction.
- the ion collector 1 of this size has a current of approximately 500 ° (, 1.15 A (2.2 W) when an AC current of 0.55 A (0.44 W) is applied.
- the temperature with respect to the current and power of the ion collector 1 was also obtained by spot welding a R-type thermocouple with a wire diameter of 0.05 mm to the tip of the airbin ion collector. Time goes out.
- the material of grid 2 is not limited to tantalum wire, and it is possible to reduce the current flowing through the grid by using a titanium material having high electrical resistivity.
- platinum-coated molybdenum wire that has good shape stability and is resistant to surface oxidation may be used.
- two current introduction terminals are connected to each of the three electrodes of the ion collector 1, the grid 2, and the filament 3, and independent heating power sources 5, 2 2, 3 are connected thereto. 2 are connected so that each temperature can be adjusted independently.
- Figure 3 shows an example of a probe when the present invention is applied to an extractor type ionization vacuum gauge (grid terminals 2 1 and 2 1, and hot cathode filament terminals 3 1 and 3 1 ' Is omitted).
- a hairpin-shaped ion collector 1 is inserted from the hole of the reflector 9 and a current flows from the atmosphere side through the vacuum terminals 1 1, 1 1 5 so that the ion collector 1 always has a clean surface. Can be maintained Become capable.
- FIG. 4 shows an example of a part of a sensor when the present invention is applied to a quadrupole mass spectrometer with a total pressure measuring electrode. This is applied to the total pressure measuring electrode of a quadrupole mass spectrometer with a total pressure measuring electrode of another patent application (Japanese Patent Application 2005-85044) of the present inventor.
- the total pressure measurement accuracy of the analyzer becomes more accurate, and gas analysis can be performed in a vacuum generated by pollutant molecules.
- the ion collector is not limited to the hairpin shape.
- the vacuum terminals 1 1 and 1 1 ' are placed at opposite positions on the side of the vacuum vessel, and placed in the grid in a straight line. You can do it.
- the specific example shown in Fig. 6 is a BA-type ionization vacuum gauge designed to reduce the current load on the current introduction terminal.
- Heating power is introduced into the ion collector 1 by applying high-frequency power from outside the vacuum using the transmitter 5 3 by the resonance circuit of the air-core solenoid 5 1 and the air-core solenoid 5 2 5 2 5 sandwiching it.
- the two vacuum terminals 1 1 and 1 1 ′ in Fig. 1 can be combined into one as shown in Fig. 6, and the current flowing through the current introduction terminal 1 1 is obtained from the ion current of the ionization gauge. Therefore, there is no need to use a thick current introduction terminal.
- the high frequency heating power is supplied to the ion collector 1.
- the present invention is not limited to this, and the present invention is also applied to the heating power source of the grid 2 having a larger current load.
- the high-frequency heating power input method is applicable.
- FIG. 7 The specific example shown in FIG. 7 is an example in which the BA ionization vacuum gauge of the present invention is changed to a triode ionization vacuum gauge. That is, a cylindrical electrode 60 is provided so as to wrap the three types of electrodes of the ion collector 1, grid 2, and filament 3 of FIG. Switch the electrical circuit so that it becomes a new ion collector 60 and connect it to the micrometer 8 via the vacuum terminal 61.
- the hairpin-shaped ion collector 1 placed in the center of the grid 2 is switched as a new electron source 3 ′, Electron emission from the electron source 3 'can be controlled using the heating power source 5, so it can be used as a triode ionization gauge that can measure pressures higher than two digits higher than the BA ionization gauge. It will be possible. At this time, filament 3 used as a BA ionization vacuum gauge is not necessary, but this electrode can be released or shortly connected to grid 2.
- the vacuum container 4 is made of glass or a ceramic material, and an infrared lamp or a high-frequency heating device is used from the outside atmospheric pressure side to form a cylindrical ion collector. Heating 60 and minimizing the adsorption of contaminants is also within the scope of the present invention. .
- the collector electrode of the BA-type ionization vacuum gauge of the present invention is switched with a switch (not shown), and the collector is connected to the circuit 62 as a pressure element resistor of the Villa2 vacuum gauge.
- a switch not shown
- the collector is connected to the circuit 62 as a pressure element resistor of the Villa2 vacuum gauge.
- An example of this is shown. Since the collector of a platinum clad molybdenum wire having a diameter of 0.1 to 0.15 as the heat conduction resistor can be formed, the pressure between atmospheric pressure and IPa can be measured. With just one stylus, it is possible to measure pressure accurately between the dog pressure and 10 ⁇ 9 mm.
- the volume of the chamber 70 is 0.5 liters, exhausted by a 50 liter / second small composite turbo molecular pump 71 through pulp 74, and the roughing pump is a diaphragm pump. 7 Goed in 2nd.
- the investigation ionization vacuum gauge (hereinafter referred to as TG) of FIG. 1 of the present invention is connected to the chamber 70.
- a standard ionization gauge (hereinafter referred to as RG) for investigating the change in sensitivity of TG is connected, but in order to prevent contamination of RG, valve 73 is installed in the middle, and TG lighting test Inside, valve 73 is closed and RG is off.
- a pollutant gas source a 10A electric wire with a thickness of 0,5 min made of silicone rubber, approx. The gas generated from silicon rubber was used when the exhaust was continued in the chamber.
- valve 73 is closed, the current shown in the graph of Fig. 2 is passed through the TG ion collector 1 to maintain the temperature of the ion collector 1 at 1000 ° C for 3 minutes, and then the heating is stopped.
- the pressure display of TG when it was sufficiently lowered, it showed 8X l (T 4 Pa.
- valve 7 3 was opened and the pressure was measured with RG, 7 X 10 ' 4 Pa was The sensitivity of TG has been improved to the same level as RG.
- valve 7 4 was adjusted to hold lO ' 1 ! ⁇ For 6 hours as before. After that, when the indicated pressure of TG decreased, when RG was turned on and compared, RG showed 3 X 10 ' 2 Pa, and TG indicated 4 X 10 " 2 Pa. Slight TG sensitivity The sensitivity of TG was higher than that of RG, and no decrease in the sensitivity of TG was observed .. After that, as a result of leaving for 8 hours, the RG indicated pressure was 3 xl (when T 2 Pa. The indicated pressure was 4 X 10 " 3 Pa, and no decrease in TG sensitivity was observed.
- the investigation of the present invention showed a method of continuously raising the temperature of the ion collector, the ion collector 1 does not have to be continuously washed, and intermittent heating is performed to perform flash heating immediately before measurement. Also good.
- the operating condition of the collector grid is indicated by temperature, but it may be expressed by current and power (watts) giving this temperature.
- the hair source type hot cathode filament is described as an example of the electron source 3, but the electron source 3 is not limited to this, and Spindt type emitters and carbon nanotubes are used. Any method may be used, such as a cold cathode emitter such as an emitter, or an ion generation method using a laser.
- the filament heating power source in Fig. 1, the grid heating power source in Fig. 1, and the grid heating power source in Fig. 7 are shown using an AC power source. Not limited to alternating current, a direct current power supply may be used. Industrial applicability
- the present invention relates to the vacuum industry used in the semiconductor industry where vacuum technology is essential, various thin film deposition industries, surface analysis equipment, various product developments such as electron microscopes, production technology, and basic research departments such as accelerator science. It is an ionization gauge used for pressure and residual gas separation.
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Abstract
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06746359A EP1890124A4 (en) | 2005-05-09 | 2006-05-08 | IONISIERUNGSUNTERDRUCKMESSVORRICHTUNG |
US11/920,085 US7741852B2 (en) | 2005-05-09 | 2006-05-08 | Ionization vacuum gauge |
JP2007528344A JP5127042B2 (ja) | 2005-05-09 | 2006-05-08 | 電離真空計 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-136760 | 2005-05-09 | ||
JP2005136760 | 2005-05-09 |
Publications (1)
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WO2006121173A1 true WO2006121173A1 (ja) | 2006-11-16 |
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ID=37396677
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2006/309612 WO2006121173A1 (ja) | 2005-05-09 | 2006-05-08 | 電離真空計 |
Country Status (4)
Country | Link |
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US (1) | US7741852B2 (ja) |
EP (1) | EP1890124A4 (ja) |
JP (1) | JP5127042B2 (ja) |
WO (1) | WO2006121173A1 (ja) |
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WO2011040625A1 (ja) * | 2009-09-29 | 2011-04-07 | 有限会社真空実験室 | イオン源を有する真空計測装置 |
WO2011102117A1 (ja) * | 2010-02-17 | 2011-08-25 | 株式会社アルバック | 四重極型質量分析計 |
JP2011242172A (ja) * | 2010-05-14 | 2011-12-01 | Ulvac Japan Ltd | 酸素検出計、酸素検出機能付き電離真空計及び質量分析計 |
JP2012242198A (ja) * | 2011-05-18 | 2012-12-10 | Ulvac Japan Ltd | 水素またはヘリウム用の検出計及び水素またはヘリウムの検出方法並びにリークディテクタ |
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US20140183349A1 (en) * | 2012-12-27 | 2014-07-03 | Schlumberger Technology Corporation | Ion source using spindt cathode and electromagnetic confinement |
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US9335231B2 (en) * | 2014-03-25 | 2016-05-10 | Mks Instruments, Inc. | Micro-Pirani vacuum gauges |
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2006
- 2006-05-08 WO PCT/JP2006/309612 patent/WO2006121173A1/ja active Application Filing
- 2006-05-08 JP JP2007528344A patent/JP5127042B2/ja active Active
- 2006-05-08 EP EP06746359A patent/EP1890124A4/en not_active Withdrawn
- 2006-05-08 US US11/920,085 patent/US7741852B2/en not_active Expired - Fee Related
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JPS6249232A (ja) * | 1985-08-28 | 1987-03-03 | Anelva Corp | B−a型電離真空計 |
JPH01143928A (ja) * | 1987-11-30 | 1989-06-06 | Tokuda Seisakusho Ltd | イオンゲージ |
Non-Patent Citations (1)
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011040625A1 (ja) * | 2009-09-29 | 2011-04-07 | 有限会社真空実験室 | イオン源を有する真空計測装置 |
JPWO2011040625A1 (ja) * | 2009-09-29 | 2013-02-28 | 有限会社真空実験室 | イオン源を有する真空計測装置 |
WO2011102117A1 (ja) * | 2010-02-17 | 2011-08-25 | 株式会社アルバック | 四重極型質量分析計 |
US8674298B2 (en) | 2010-02-17 | 2014-03-18 | Ulvac, Inc. | Quadrupole mass spectrometer |
JP5669324B2 (ja) * | 2010-02-17 | 2015-02-12 | 株式会社アルバック | 四重極型質量分析計 |
JP2011242172A (ja) * | 2010-05-14 | 2011-12-01 | Ulvac Japan Ltd | 酸素検出計、酸素検出機能付き電離真空計及び質量分析計 |
JP2012242198A (ja) * | 2011-05-18 | 2012-12-10 | Ulvac Japan Ltd | 水素またはヘリウム用の検出計及び水素またはヘリウムの検出方法並びにリークディテクタ |
GB2621402A (en) * | 2022-08-12 | 2024-02-14 | Edwards Ltd | Pressure gauge power supply unit |
Also Published As
Publication number | Publication date |
---|---|
US20090096460A1 (en) | 2009-04-16 |
EP1890124A1 (en) | 2008-02-20 |
EP1890124A4 (en) | 2012-08-22 |
US7741852B2 (en) | 2010-06-22 |
JPWO2006121173A1 (ja) | 2008-12-18 |
JP5127042B2 (ja) | 2013-01-23 |
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