WO2022196438A1 - 気圧検出センサ、気圧検出装置及び気圧検出装置の製造方法 - Google Patents
気圧検出センサ、気圧検出装置及び気圧検出装置の製造方法 Download PDFInfo
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- WO2022196438A1 WO2022196438A1 PCT/JP2022/009979 JP2022009979W WO2022196438A1 WO 2022196438 A1 WO2022196438 A1 WO 2022196438A1 JP 2022009979 W JP2022009979 W JP 2022009979W WO 2022196438 A1 WO2022196438 A1 WO 2022196438A1
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- pressure detection
- thermistor
- atmospheric pressure
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Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L21/00—Vacuum gauges
- G01L21/10—Vacuum gauges by measuring variations in the heat conductivity of the medium, the pressure of which is to be measured
- G01L21/12—Vacuum gauges by measuring variations in the heat conductivity of the medium, the pressure of which is to be measured measuring changes in electric resistance of measuring members, e.g. of filaments; Vacuum gauges of the Pirani type
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
- G01L11/002—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by thermal means, e.g. hypsometer
Definitions
- the present invention relates to an atmospheric pressure detection sensor, an atmospheric pressure detection device, and a method for manufacturing an atmospheric pressure detection device.
- thermal conduction vacuum gauges are used to measure pressure in a vacuum in order to control and improve product quality by controlling the vacuum environment to an appropriate state.
- Pirani vacuum gauges and thermistor vacuum gauges are available as total pressure gauges that utilize this pressure dependence of heat conduction.
- the Pirani vacuum gauge is a vacuum gauge that measures pressure by detecting changes in electrical resistance caused by temperature changes due to gas heat conduction in thin metal wires of platinum or tungsten that are electrically heated. Although the structure is simple, stability and accuracy cannot be expected, and there is also the problem of poor temporal responsiveness.
- a thermistor vacuum gauge is a vacuum gauge that uses a semiconductor oxide thermistor with a large temperature resistance coefficient instead of the metal wire of the Pirani vacuum gauge.
- Early thermistor vacuum gauges used bead-type thermistors. Bead-type thermistors have large variations in resistance value, and there is also variation in size, which poses a problem of interchangeability.
- Various proposals have been made to improve the sensitivity and accuracy of thermistor vacuum gauges (see Patent Documents 1 to 5).
- the embodiments of the present invention have been made in view of the above circumstances, and aim to provide an air pressure detection sensor, an air pressure detection device, and a method of manufacturing an air pressure detection device that can be expected to further improve accuracy.
- the atmospheric pressure detection sensor of the embodiment of the present invention enables vacuum measurement and atmospheric pressure measurement greater than the atmospheric pressure.
- An atmospheric pressure detection sensor includes a pressure detection thermistor that detects a change in heat loss amount according to the thermal conductivity of an atmosphere, and a pressure compensation thermistor that serves as a reference for pressure detection.
- the thermistor for pressure detection and the thermistor for pressure compensation are characterized in that at least resistance values are paired as electrical characteristics, and at least heat dissipation constants are paired as thermal characteristics. This can be expected to improve accuracy.
- the atmospheric pressure detection sensors are bridge-connected to form a bridge circuit.
- the method of manufacturing the atmospheric pressure detection device includes a thin film thermistor for pressure detection that detects a change in the amount of heat loss according to the thermal conductivity of the atmosphere, and a pressure compensation device that serves as a reference for pressure detection.
- the thermistor for pressure detection and the thermistor for pressure compensation are paired with at least a resistance value as electrical characteristics and at least a heat dissipation constant as thermal characteristics, and are bridge-connected.
- a method of manufacturing an atmospheric pressure detection device having a bridge circuit characterized by comprising an offset adjustment step of adjusting an output voltage of the atmospheric pressure detection device to zero under atmospheric pressure.
- a vacuum detection sensor capable of improving accuracy
- an air pressure detection sensor capable of measuring air pressure higher than the atmospheric pressure
- an air pressure detection device capable of measuring air pressure higher than the atmospheric pressure
- a method of manufacturing the air pressure detection device it is possible to provide a vacuum detection sensor capable of improving accuracy, an air pressure detection sensor capable of measuring air pressure higher than the atmospheric pressure, an air pressure detection device, and a method of manufacturing the air pressure detection device.
- the atmospheric pressure detection sensor of the embodiment can measure atmospheric pressure higher than atmospheric pressure, it can be applied to sensors and wind speed detection devices that can detect wind speed by measuring wind pressure.
- FIG. 1 is a perspective view showing a thin film thermistor according to an embodiment of the invention
- FIG. It is a top view which makes a cross section and shows the base member in the same thin film thermistor. It is a top view which expands and shows the same thin film thermistor.
- 4 is a cross-sectional view taken along line XX in FIG. 3;
- FIG. It is a perspective view showing a same atmospheric pressure detection sensor.
- It is a top view which shows a same atmospheric pressure detection sensor.
- It is a connection diagram showing a same atmospheric pressure detection device.
- 4 is a graph showing reproducibility as an output characteristic of the same atmospheric pressure detection device.
- 4 is a graph showing output stability as output characteristics of the same atmospheric pressure detection device.
- 4 is a graph showing the relationship between pressure and output voltage as output characteristics of the same atmospheric pressure detection device.
- the atmospheric pressure detection device of this embodiment uses a thermal conduction type atmospheric pressure detection sensor that detects the pressure of the atmosphere by utilizing the fact that the thermal conductivity of the atmosphere changes with the pressure.
- This atmospheric pressure detection sensor comprises a pressure detection thermistor and a pressure compensation thermistor that are paired in terms of temperature and thermal characteristics. is detected, and this temperature change is detected as a resistance change of the thermistor.
- FIG. 1 to 4 show a thin film thermistor as a thermal resistance element
- FIGS. 5 and 6 show an atmospheric pressure detection sensor.
- the atmospheric pressure detection sensor 1 includes a thin film thermistor 10 as a pair of pressure detection thermistors and a thin film thermistor 10' as a pressure compensation thermistor serving as a reference for pressure detection.
- a thin film thermistor 10 for pressure compensation and a thin film thermistor 10' for pressure compensation are housed in a substantially rectangular parallelepiped case 2.
- the pressure-detecting thin-film thermistor 10 and the pressure-compensating thin-film thermistor 10' are thermal resistance elements that are paired with high accuracy and have approximately the same characteristics as will be described later.
- the thin film thermistor 10 for pressure detection will be described with reference to FIG. Since the thin film thermistor 10 for pressure detection and the thin film thermistor 10' for pressure compensation basically have the same configuration, the thin film thermistor 10 for pressure detection will be described as a representative.
- a thin film thermistor 10 for pressure detection is of a surface mount type and has an insulating substrate 11 , a pair of electrode layers 12 a and 12 b as electrode portions, a heat sensitive film 13 and a protective film 14 . Moreover, the thin film thermistor 10 is formed in a substantially rectangular parallelepiped shape, and preferably has a substrate thickness of 200 ⁇ m or less and a size of 1 mm in width ⁇ 0.5 mm in length or more. As a result, it is possible to reduce the thickness and size while ensuring a predetermined surface area.
- a lead member 20 is connected to the thin film thermistor 10 as shown in FIGS.
- the insulating substrate 11 has a substantially rectangular shape and is made of insulating ceramic material such as zirconia, silicon nitride, alumina, or a mixture of at least one of these.
- the insulating substrate 11 is thinned to a thickness of 200 ⁇ m or less, preferably 100 ⁇ m or less.
- the bending strength of the insulating substrate 11 is 690 MPa or more, and the average grain size of the ceramic material after firing is 0.1 ⁇ m to 2 ⁇ m. By setting the range of the average grain size in this way, it is possible to ensure a bending strength of 690 MPa or more, and to suppress cracks during the production of the thin insulating substrate 11 .
- the thickness dimension of the insulating substrate 11 is small, the heat capacity can be reduced.
- the pair of electrode layers 12a and 12b are formed on the insulating substrate 11, are portions to which the heat-sensitive film 13 is electrically connected, and are arranged to face each other with a predetermined gap.
- the pair of electrode layers 12a and 12b is formed by forming a metal thin film to a thickness of 1 ⁇ m or less by a thin film forming technique such as a sputtering method, and the metal material is gold (Au). , silver (Ag), copper (Cu), platinum (Pt), and palladium (Pd), and alloys thereof, such as Ag--Pd alloys.
- the pair of electrode layers 12a and 12b is a portion to which a lead member 20, which will be described later, is joined by welding.
- Cu melting point 1085° C.
- an alloy containing at least one of these as a main component is preferably used.
- the electrode layers 12a and 12b are formed under the heat-sensitive film 13 in this embodiment, they may be formed on or in the heat-sensitive film 13. FIG.
- the heat-sensitive film 13 is a heat-sensitive thin film, and is a thermistor thin film made of an oxide semiconductor having a negative temperature coefficient.
- the heat-sensitive film 13 is formed on the electrode layers 12a and 12b by a thin film forming technique such as a sputtering method so as to straddle the electrode layers 12a and 12b, and is electrically connected to the electrode layers 12a and 12b. ing.
- the heat-sensitive film 13 is composed of two or more elements selected from transition metal elements such as manganese (Mn), nickel (Ni), cobalt (Co), and iron (Fe), and has a spinel crystal structure. It is composed of a thermistor material containing as a main component a composite metal oxide with In addition, subcomponents may be contained for the purpose of improving properties and the like. The composition and content of the main component and subcomponents can be appropriately determined according to the desired properties.
- the protective film 14 covers the region where the heat-sensitive film 13 is formed, and covers the electrode layers 12a and 12b by forming exposed portions 121a and 121b so that at least parts of the electrode layers 12a and 12b are exposed.
- the protective film 14 can be formed by forming a film of silicon dioxide, silicon nitride, or the like by a thin film forming technique such as a sputtering method, or by forming lead glass, borosilicate glass, lead borosilicate glass, or the like by a printing method. can.
- a pair of lead members 20a and 20b are welded and electrically connected to the thin film thermistor 10 as described above.
- the lead members 20a and 20b are elastic bodies having elasticity formed by chemical etching, pressing, or the like, and are plate-shaped thin narrow metal plates, which are lead frames.
- the lead members 20a and 20b have a thickness of 100 ⁇ m or less, preferably about 30 ⁇ m, and a width of 80 ⁇ m to 200 ⁇ m. Also, a material having a thermal conductivity of 50 W/m ⁇ K or less is used.
- the lead member 20 for example, constantan, which has a low thermal conductivity of 19.5 W/m ⁇ K, is used.
- a material such as Hastelloy (registered trademark) may be used as a material with low thermal conductivity.
- lead members 20a and 20b are connected to the electrode layers 12a and 12b while being welded by laser welding. Therefore, the mutual metals of the electrode layers 12a, 12b and the lead members 20a, 20b are melted and joined. Therefore, there is no additional material such as a filler material (brazing material) used for soldering between the electrode layers 12a, 12b and the lead members 20a, 20b. can be reduced, the thermal time constant can be reduced, and the thermal response of the thin film thermistor 10 can be increased.
- a filler material soldering material
- the heat capacity and heat dissipation constant of the thin film thermistor 10 due to the lead member 20 can be reduced. Since the thin film thermistor 10 is thin and miniaturized, the thin film thermistor 10 having high sensitivity and excellent thermal response can be realized.
- the lead members 20a and 20b are formed to have joint portions 21a and 21b and lead portions 22a and 22b integrally extending from the joint portions 21a and 21b.
- the joint portions 21a and 21b are portions that are joined to the electrode layers 12a and 12b of the thermal element 10 by welding, and are arranged in a direction perpendicular to the direction in which the electrode layers 12a and 12b are arranged side by side.
- the lead portions 22a and 22b are bent outward from the joint portions 21a and 21b and extend in a direction parallel to the joint portions 21a and 21b.
- the width of the joints 21a and 21b joined to the electrode layers 12a and 12b of the thin film thermistor 10 is narrower than the width of the lead parts 22a and 22b.
- the thin-film thermistor 10 is joined to the tips of the joining portions 21a and 21b so as to be connected in a cross-linking manner.
- the lead members 20a and 20b are made of a low-melting-point metal, that is, a metal having a melting point of 1300° C. or less. .
- a constantan material is used as described above.
- the melting point of the lead members 20a and 20b is 1300° C. or less, so that they can be melted by heating with a laser beam or the like.
- the temperature does not exceed the melting point of 1300°C. Therefore, since the melting point of the ceramic substrate of 1600° C. to 2100° C. is not exceeded, damage to the electrode layers 12a and 12b of the thermal element 10 and the insulating substrate 11 immediately below the electrode layers 12a and 12b is suppressed, and the lead members 20a and 20b are removed. can be spliced.
- the connecting (joining) portion is not joined in a state where the additional material is substantially added, and the thickness dimension does not increase. High sensitivity and high speed thermal response can be achieved without increasing the heat capacity.
- iron-based metals such as stainless steel, kovar, and nickel alloys are used for the lead members as described above.
- This iron-based metal has a high melting point.
- the temperature may rise to about 1538° C., the melting point of iron.
- the lead member and its surroundings are heated to a high temperature, and the insulating substrate (for example, an alumina substrate) is easily damaged. Occur.
- solder bonding has a problem that the heat resistance temperature is 150° C. or less in consideration of the temperature cycle, and the heat resistance of 200° C. or more cannot be ensured.
- the configuration of the present embodiment it is possible to ensure heat resistance of 200°C or more, and to solve such problems. Further, since no additional material or filler material (brazing material) is interposed between the electrode layers 12a, 12b and the lead members 20a, 20b, the amount of the inclusions does not vary. Therefore, variations in the output characteristics of individual thin film thermistors can be suppressed.
- the base member 30 is a substantially disk-shaped metal member, and the conductive terminal portion 32 is inserted through the insulating member 31 .
- Lead members 20a and 20b led out from the thin film thermistor 10 are electrically connected to the conductive terminal portion 32 by welding.
- the insulating member 31 is made of an insulating material such as glass or resin.
- the base member 30 is made of an insulating material, the insulating member 31 can be eliminated. Also, the conductive terminal portion 32 may be configured by a printed wiring board or the like.
- the atmospheric pressure detection sensor 1 accommodates a thin film thermistor 10 for pressure detection and a thin film thermistor 10' for pressure compensation which are paired with high accuracy and have approximately the same characteristics in a case 2. It is
- the case 2 has a substantially rectangular parallelepiped outer shape, and is formed by partitioning a pair of tapered cylindrical storage spaces 21 and 21'.
- the case 2 preferably has a thermal conductivity of 80 W/m ⁇ K or more, and is made of aluminum, for example, so that the temperature inside the case 2 can be kept constant by suppressing the influence of ambient temperature fluctuations.
- the case 2 may be heated using a temperature adjusting means such as a heater. In this case, it is possible to further suppress the influence of ambient temperature fluctuations.
- a thin film thermistor 10 for pressure detection is housed in the housing space 21 .
- a through hole 21a that opens outward is formed at the tip side of the housing space 21, and the housing space 21 communicates with the outside air (atmosphere) through the through hole 21a. Therefore, the thin film thermistor 10 for pressure detection is in a state of being affected by the outside air.
- a thin film thermistor 10' for pressure compensation is housed in a sealed state under a constant pressure, specifically atmospheric pressure.
- the thin film thermistor 10 for pressure detection is in a state where it is not affected by outside air (atmosphere).
- the pressure-detecting thin-film thermistor 10 and the pressure-compensating thin-film thermistor 10' have substantially the same shape of the case 2, more specifically, the housing space 21 and the housing space 21', and their peripheral walls. is housed in case 2 of The through hole 21 a of the housing space 21 is formed to have a smaller diameter than the inner diameter of the housing space 21 . Therefore, there is no large difference in volume between the accommodation space portion 21 and the accommodation space portion 21'. Therefore, the pressure detecting thin film thermistor 10 and the pressure compensating thin film thermistor 10' are placed in substantially the same thermal environment, and the difference in thermal influence between them can be reduced.
- Variation in the heat dissipation constant between the thin film thermistor 10 for pressure detection and the thin film thermistor 10' for pressure compensation including radiation heat from the inner peripheral wall of the portion 21', can be reduced.
- Conductive terminal portions 32 and 32' are led out from the rear end side of the case 2.
- the case for accommodating the thin film thermistor 10 for pressure detection and the case for accommodating the thin film thermistor 10' for pressure compensation may be constructed separately so as to form substantially the same thermal environment. (pairing) Pairing of the thin film thermistor 10 for pressure detection and the thin film thermistor 10' for pressure compensation will be described.
- the characteristics of a thermistor are basically determined by its resistance value (zero load resistance value at 25°C), B constant, heat dissipation constant, and thermal time constant. Also, the resistance value and B constant can be grasped as electrical characteristics, and the heat dissipation constant and thermal time constant can be grasped as thermal characteristics.
- the variation (tolerance) of the resistance value of this type of thermistor is ⁇ 5%
- the variation of the B constant is ⁇ 3%
- the variation of the heat dissipation constant is about ⁇ 10%
- the accuracy of the atmospheric pressure detection sensor is ⁇ 20%.
- the pairing of the characteristic values of the thin film thermistor 10 for pressure detection and the thin film thermistor 10' for pressure compensation has a resistance value of ⁇ 0.2% or less and a B constant of ⁇ 0.
- the accuracy is 0.2% or less.
- the heat dissipation constant as a thermal characteristic is ⁇ 0.2% or less.
- the electrode surface of the thin-film thermistor and part of the thin-film thermistor body are shaved by laser irradiation or sandblasting. and trimming method is applied.
- the thickness of the insulating substrate of the thin film thermistor when correcting the variation in the heat dissipation constant, the thickness of the insulating substrate of the thin film thermistor, the uniformity of the dicing size when cutting the thin film thermistor from the same wafer, and the case having the same shape and almost the same size are used. Processing measures such as exposure to a thermal environment and joining the lead members by welding are applied as appropriate.
- a means of sorting the manufactured thin film thermistors may be applied.
- Electrodes No. 1 to No. 8 Eight thin-film thermistor samples (elements No. 1 to No. 8) subjected to pairing processing were prepared. Element no. 1 to No. The resistance value (K ⁇ ) at 25°C, the resistance value (K ⁇ ) at 85°C, and the heat dissipation constant (mw/°C) in 8 are obtained. The average value, maximum value, minimum value and variation value of were calculated.
- the resistance value accuracy (tolerance) of the bead type thermistor is about ⁇ 15%, and the heat dissipation constant is a reference value, and the accuracy is not controlled at present. is.
- the resistance value accuracy of the thin film thermistor is about ⁇ 5%, and the heat dissipation constant is a reference value like the bead type thermistor, and the accuracy is not controlled. This is because there was no way to accurately measure the heat dissipation constant.
- the inventors focused on the heat dissipation constant established a technique for measuring the heat dissipation constant with high accuracy, and applied it to the present invention.
- the accuracy of the atmospheric pressure detection sensor cannot be less than ⁇ 15%.
- the heat dissipation constant is about ⁇ 15%, the accuracy of the atmospheric pressure detection sensor cannot be less than ⁇ 15%.
- the accuracy of thermal conductivity type vacuum sensors currently on the market is ⁇ 15% to ⁇ 50%.
- the resistance value should be controlled to ⁇ 1% or less, and the heat dissipation constant should be precisely controlled to ⁇ 1% or less.
- high precision can be achieved by "Regarding the resistance value of ⁇ 1% or less” indicates a tolerance based on the average value of the resistance values of the thin film thermistor 10 for pressure detection and the thin film thermistor 10' for pressure compensation. The same is true for heat dissipation constants. Therefore, specifically, the pairing of the resistance value and the heat dissipation constant is performed by controlling and manufacturing with a predetermined tolerance.
- the thin-film thermistor 10 for pressure detection and the thin-film thermistor 10' for pressure compensation are paired with at least resistance values as electrical characteristics, and at least heat dissipation constants as thermal characteristics. It is possible to improve the accuracy.
- the atmospheric pressure detection device 100 has a bridge circuit in which a power source V is connected to the atmospheric pressure detection sensor 1 .
- a differential output between the output voltages Vout1 and Vout2 can be detected as the output voltage Vout.
- An output terminal is connected to the middle of each series circuit, and the potential difference between the middle points of the output voltages Vout 1 and Vout 2 can be detected as the output voltage Vout.
- the thin film thermistor 10 for pressure detection and the thin film thermistor 10' for pressure compensation may be connected in parallel to form a bridge circuit.
- the series circuit of the fixed resistor R1 and the thin film thermistor 10 for pressure detection, the fixed resistor R2 , the variable resistor RV and the thin film thermistor 10' for pressure compensation are connected to the power source V by a limiting resistance. are connected in parallel via the device R3.
- An output terminal is connected to the middle of each series circuit, and the potential difference between the middle points of the output voltages Vout 1 and Vout 2 can be detected as the output voltage Vout. If vibration or the like becomes a problem, a fixed resistor can be combined without using a variable resistor.
- an offset adjustment process is performed to adjust the offset voltages of the output voltages Vout1 and Vout2 to zero under atmospheric pressure. Specifically, the potential difference between the output voltages Vout1 and Vout2 is adjusted to zero by adjusting the resistance value of the variable resistor RV . Since the pressure compensating thin film thermistor 10' is housed in the case 2 in a sealed state under atmospheric pressure, offset adjustment can be performed with high precision and ease.
- the atmospheric pressure detection sensor 1 is arranged in the atmosphere to be measured.
- the pressure detecting thin film thermistor 10 detects a change in the state of heat dissipation, that is, a change in the amount of heat loss, based on the thermal conductivity of the atmosphere to be measured, and detects this temperature change as a resistance change. do.
- output voltages Vout 1 and Vout 2 are detected, and the potential difference at the midpoint between them is detected as the output voltage Vout. Since the thermal conductivity of the atmosphere depends on the pressure, the pressure of the atmosphere to be measured can be detected from the output voltage Vout.
- the output voltage Vout is input to a control processing means such as a microcomputer (not shown) where it is arithmetically processed and the pressure of the atmosphere to be measured is output as a detection output.
- the thin film thermistor 10 for pressure detection and the thin film thermistor 10' for pressure compensation are controlled so that their self-heating temperature is 200° C. or less in order to ensure heat resistance.
- FIG. 8 is a graph showing the results of confirmation of repeatability
- FIG. 9 is a graph showing output stability
- FIG. 10 is a graph showing the relationship between pressure and output voltage. (Repeatability)
- samples 1 and 2 of two atmospheric pressure detection devices were prepared and the repeatability was measured.
- the horizontal axis indicates the number of measurements (times), and the vertical axis indicates the output voltage (mV).
- the ambient temperature is 25° C. and the atmospheric pressure of the atmosphere to be measured is 100 Pa under the same conditions, but the divided atmosphere to be measured is changed for each number of measurements from the first to the fourth times.
- FIG. 9 the stability of the output of the atmospheric pressure detection device was measured.
- the horizontal axis indicates time (s), and the vertical axis indicates output voltage (mV).
- the ambient temperature is 25° C. and the atmospheric pressure of the atmosphere to be measured is 100 Pa.
- the output voltage hardly changes in the range of 60 seconds to 9000 seconds and is extremely stable. (Relationship between pressure and output voltage)
- sample 1 and sample 2 of two atmospheric pressure detection devices were prepared, and the relationship between pressure and output voltage was measured.
- the horizontal axis indicates pressure (Pa), and the vertical axis indicates output voltage (mV).
- Such output characteristics are obtained because the thin film thermistor 10 for pressure detection and the thin film thermistor 10' for pressure compensation are paired with high precision.
- the surface area can be increased compared to a conventional bead type thermistor, and the lead members 20a and 20b have a thermal conductivity of 50 W/m. ⁇ Because a material with a low thermal conductivity of K or less is used, the heat dissipation constant can be reduced and the sensitivity can be improved.
- the thin film thermistor 10 for pressure detection and the thin film thermistor 10' for pressure compensation are paired with high accuracy, the measurement accuracy can be improved and variations in the individual atmospheric pressure detection sensors 1 can be reduced. can do.
- the pressure-detecting thin-film thermistor 10 and the pressure-compensating thin-film thermistor 10' are arranged in substantially the same thermal environment in the case 2 having the same shape, and that the pressure-detecting thin-film thermistor 10 It is believed that this is because the lead members 20a and 20b are joined by welding to the thin film thermistor 10' for compensating for pressure, thereby reducing variations in the heat dissipation constant.
- a lead member may be joined to this wiring pattern using a material.
- Reference numerals 1 atmospheric pressure detection sensor 2: case 10: thin film thermistor for pressure detection 10': thin film thermistor for pressure compensation Reference Signs List 11 Insulating substrates 12a, 12b Electrode layers 13 Thermal films 14 Protective films 20 Lead members 21 . . . accommodation space portion 21a .. through hole 22a . . . . conductive terminal portion 100 .. atmospheric pressure detection device
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Abstract
Description
本発明の実施形態による気圧検出装置は、気圧検出センサがブリッジ接続されてブリッジ回路を構成している。
[気圧検出センサ]
図2乃至図4に示すように薄膜サーミスタ10には、リード部材20が接続されており、このリード部材20は、ベース部材30に接続されている。
(ペアリング)
圧力検出用の薄膜サーミスタ10と圧力補償用の薄膜サーミスタ10´とのペアリングについて説明する。
[気圧検出装置]
[出力特性]
(繰り返し再現性)
(出力の安定性)
図に示すように、出力電圧は60秒~9000秒の範囲で変化はほとんどなく、極めて安定していることが分かる。
(圧力と出力電圧の関係)
以上のように本実施形態によれば、感度及び精度の向上が可能な気圧検出センサ1、気圧検出装置100及び気圧検出装置の製造方法を提供することができる。
2・・・・・・・・ケース
10・・・・・・・圧力検出用の薄膜サーミスタ
10´・・・・・・圧力補償用の薄膜サーミスタ
11・・・・・・・絶縁性基板
12a、12b・・電極層
13・・・・・・・感熱膜
14・・・・・・・保護膜
20・・・・・・・リード部材
21・・・・・・・収容空間部
21a・・・・・・貫通孔
22a・・・・・・電極部
22b・・・・・・リード部
30・・・・・・・ベース部材
32・・・・・・・導電端子部
100・・・・・・気圧検出装置
Claims (14)
- 雰囲気の熱伝導率に応じて熱損失量の変化を検出する圧力検出用のサーミスタと、
圧力検出の基準となる圧力補償用のサーミスタとを備え、
前記圧力検出用のサーミスタと前記圧力補償用のサーミスタとは、電気的特性として少なくとも抵抗値がペアリングされ、熱的特性として少なくとも熱放散定数がペアリングされていることを特徴とする気圧検出センサ。 - 前記圧力検出用のサーミスタ及び前記圧力補償用のサーミスタは、薄膜サーミスタであることを特徴とする請求項1に記載の気圧検出センサ。
- 前記圧力検出用のサーミスタ及び前記圧力補償用のサーミスタは、それぞれ区画された収容空間部を有するケースに収容され、略同一の熱的環境に配設されていることを特徴とする請求項1又は請求項2に記載の気圧検出センサ。
- 前記圧力検出用のサーミスタが収容される収容空間部は、外気と連通状態となっており、前記圧力補償用のサーミスタが収容される収容空間部は、一定の気圧で密封状態となっていることを特徴とする請求項3に記載の気圧検出センサ。
- 前記圧力検出用のサーミスタ及び前記圧力補償用のサーミスタの電極層には、リード部材が溶接された状態で接続されていることを特徴とする請求項1乃至請求項4のいずれか一項に記載の気圧検出センサ。
- 前記リード部材は、熱伝導率が50W/m・K以下であることを特徴とする請求項5に記載の気圧検出センサ。
- 前記抵抗値のペアリングは、±1%以下であることを特徴とする請求項1乃至請求項6のいずれか一項に記載の気圧検出センサ。
- 前記熱放散定数のペアリングは、±1%以下であることを特徴とする請求項1乃至請求項7のいずれか一項に記載の気圧検出センサ。
- 前記圧力検出用のサーミスタ及び前記圧力補償用のサーミスタの基板の厚さ寸法は200μm以下であって、横の寸法1mm×縦の寸法0.5mm以上のサイズであることを特徴とする請求項2乃至請求項7のいずれか一項に記載の気圧検出センサ。
- 前記ケースの温度を一定に調整するように構成されていることを特徴とする請求項3乃至請求項9のいずれか一項に記載の気圧検出センサ。
- 請求項1乃至請求項10のいずれか一項に記載の気圧検出センサは、ブリッジ接続されてブリッジ回路が構成されていることを特徴とする気圧検出装置。
- 前記ブリッジ回路の出力電圧は大気圧下でゼロに調整されていることを特徴とする請求項11に記載の気圧検出装置。
- 前記気圧検出センサにおける前記圧力検出用のサーミスタ及び前記圧力補償用のサーミスタは、自己発熱温度が200℃以下になるように制御されていることを特徴とする請求項11又は請求項12に記載の気圧検出装置。
- 雰囲気の熱伝導率に応じて熱損失量の変化を検出する圧力検出用のサーミスタと、圧力検出の基準となる圧力補償用のサーミスタとを備え、前記圧力検出用のサーミスタと前記圧力補償用のサーミスタとは、電気的特性として少なくとも抵抗値がペアリングされ、熱的特性として少なくとも熱放散定数がペアリングされ、ブリッジ接続されてブリッジ回路が構成されている気圧検出装置の製造方法であって、
前記気圧検出装置の出力電圧を大気圧下でゼロに調整するオフセット調整工程を有することを特徴とする気圧検出装置の製造方法。
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Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05264385A (ja) * | 1991-12-23 | 1993-10-12 | Boc Group Inc:The | 静電容量圧力変換装置及びそのセル |
JPH0665855U (ja) * | 1993-02-22 | 1994-09-16 | 株式会社芝浦電子製作所 | 湿度検知装置 |
US5347869A (en) * | 1993-03-25 | 1994-09-20 | Opto Tech Corporation | Structure of micro-pirani sensor |
JPH0734341U (ja) * | 1993-12-06 | 1995-06-23 | ウシオ電機株式会社 | 圧力センサ |
JP2005300010A (ja) * | 2004-04-12 | 2005-10-27 | Noritz Corp | 暖房乾燥機 |
JP2020046438A (ja) * | 2017-08-09 | 2020-03-26 | Semitec株式会社 | ガス検出装置、ガス検出方法及びガス検出装置を備えた装置 |
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JP3245687B2 (ja) * | 1992-05-15 | 2002-01-15 | 株式会社大泉製作所 | 熱放散定数の調整方法 |
JP3366590B2 (ja) * | 1998-02-04 | 2003-01-14 | 科学技術振興事業団 | 温度測定装置、熱型赤外線イメージセンサ及び温度測定方法 |
JP4436064B2 (ja) * | 2003-04-16 | 2010-03-24 | 大阪府 | サーミスタ用材料及びその製造方法 |
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Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05264385A (ja) * | 1991-12-23 | 1993-10-12 | Boc Group Inc:The | 静電容量圧力変換装置及びそのセル |
JPH0665855U (ja) * | 1993-02-22 | 1994-09-16 | 株式会社芝浦電子製作所 | 湿度検知装置 |
US5347869A (en) * | 1993-03-25 | 1994-09-20 | Opto Tech Corporation | Structure of micro-pirani sensor |
JPH0734341U (ja) * | 1993-12-06 | 1995-06-23 | ウシオ電機株式会社 | 圧力センサ |
JP2005300010A (ja) * | 2004-04-12 | 2005-10-27 | Noritz Corp | 暖房乾燥機 |
JP2020046438A (ja) * | 2017-08-09 | 2020-03-26 | Semitec株式会社 | ガス検出装置、ガス検出方法及びガス検出装置を備えた装置 |
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