WO2023026731A1 - 圧力センサ - Google Patents
圧力センサ Download PDFInfo
- Publication number
- WO2023026731A1 WO2023026731A1 PCT/JP2022/028419 JP2022028419W WO2023026731A1 WO 2023026731 A1 WO2023026731 A1 WO 2023026731A1 JP 2022028419 W JP2022028419 W JP 2022028419W WO 2023026731 A1 WO2023026731 A1 WO 2023026731A1
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- WO
- WIPO (PCT)
- Prior art keywords
- sensor
- sensor chip
- longitudinal direction
- diaphragm
- pressure sensor
- Prior art date
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- 239000007767 bonding agent Substances 0.000 claims description 45
- 238000003860 storage Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 11
- 238000005304 joining Methods 0.000 abstract description 10
- 238000001514 detection method Methods 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 19
- 239000007788 liquid Substances 0.000 description 12
- 230000007423 decrease Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000003502 gasoline Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
- G01L9/04—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of resistance-strain gauges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
- G01L9/0042—Constructional details associated with semiconductive diaphragm sensors, e.g. etching, or constructional details of non-semiconductive diaphragms
- G01L9/0048—Details about the mounting of the diaphragm to its support or about the diaphragm edges, e.g. notches, round shapes for stress relief
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/04—Means for compensating for effects of changes of temperature, i.e. other than electric compensation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/14—Housings
- G01L19/147—Details about the mounting of the sensor to support or covering means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
Definitions
- the present invention relates to pressure sensors.
- Pressure sensors that use piezo elements and the like are used in various fields.
- Patent Document 1 discloses a semiconductor differential pressure sensor that is attached to a gasoline tank of an automobile and used to detect changes in the pressure of gasoline vapor in the fuel tank system.
- Patent Document 1 discloses that a pressure detecting element of a semiconductor differential pressure sensor has a main surface fixed to the top of a first protrusion with an adhesive in a state in which the second protrusion is fitted in an opening. As a result, a strong holding force and high positional accuracy of the pressure detection element can be realized, and the adhesive can be prevented from flowing into the first pressure introduction passage, thereby preventing clogging of the first pressure introduction passage. is disclosed.
- Patent Document 2 discloses a sensor chip, which is a plate-like member having a circular shape in plan view, and includes a diaphragm, a piezo diffusion gauge formed on the surface of the diaphragm, an electrode for taking out an electric signal, and a piezo diffusion gauge.
- a lead diffusion part electrically connected to the electrode, a silicon oxide film (protective film) formed so as to cover the piezo diffusion gauge and the lead diffusion part, and at least a part of the surface of the silicon oxide film used as a bonding surface for the sensor. and a cover member bonded to the chip.
- An object of the present invention is to prevent the diaphragm from being damaged, etc., and to maintain the pressure detection sensitivity in the pressure sensor.
- the pressure sensor of the present invention comprises a sensor housing having an opening with different dimensions in the longitudinal direction and the lateral direction, a sensor chip installed in the sensor housing so as to close the opening and forming a diaphragm, and a sensor chip. and a cap member bonded to the sensor chip with a cap bonding agent, and among the bonding surfaces of the cap bonding agent, the bonding surfaces at both ends in the longitudinal direction of the diaphragm portion
- the joint area is larger than the joint surface at both ends in the transverse direction.
- the pressure sensor in the pressure sensor, it is possible to prevent damage to the diaphragm portion and maintain the pressure detection sensitivity.
- FIG. 1 is a schematic configuration diagram showing a dispensing device including a pressure sensor
- FIG. 2 is an enlarged view showing an arm 16 and the like of FIG. 1
- FIG. 1 is an exploded perspective view showing a pressure sensor according to Example 1
- FIG. 3B is a vertical cross-sectional view showing the pressure sensor of FIG. 3A
- FIG. 3C is an exploded perspective view showing a sensor chip portion of the pressure sensor of FIG. 3B
- FIG. 10 is a vertical cross-sectional view showing a deformed state (longitudinal direction) of a conventional pressure sensor in use.
- FIG. 5B is a vertical cross-sectional view of the pressure sensor of FIG. 5A viewed along the lateral direction;
- FIG. 4 is a vertical cross-sectional view showing a deformed state (longitudinal direction) of the pressure sensor according to the first embodiment when in use;
- FIG. 6B is a vertical cross-sectional view of the pressure sensor of FIG. 6A as seen along the lateral direction;
- FIG. 11 is a perspective view showing a sensor chip portion of a pressure sensor according to Example 2;
- FIG. 11 is a perspective view showing a sensor chip portion of a pressure sensor according to Example 3;
- FIG. 11 is a top view showing a modification of the cap member of the pressure sensor;
- FIG. 11 is a top view showing another modification of the cap member of the pressure sensor;
- the present disclosure relates to a pressure sensor, and more particularly to a pressure sensor suitably used for detecting the pressure of a fluid such as a dispensing device.
- the pressure sensor according to the present disclosure is configured such that the deformation suppressing action of the sensor chip by the cap member acts strongly along the longitudinal direction of the diaphragm portion and acts weakly in the transverse direction.
- the pressure sensor according to the present disclosure has a configuration in which the diaphragm section is less likely to deform in the longitudinal direction and more likely to deform in the lateral direction.
- FIG. 1 is a schematic configuration diagram showing a dispensing device including a pressure sensor.
- the flow path system of the dispensing device 1 is composed of a nozzle 2, a syringe pump 4, an electromagnetic valve 5, a gear pump 6, and a water tank 7. connected with Also, the syringe pump 4 is composed of a container 9 , a plunger 10 , a ball screw 11 and a drive motor 12 .
- the dispensing device 1 also includes an arm 16 (dispensing arm).
- the drive motor 12 is controlled by the controller 14 in the same manner as the motor that drives the sample dispensing mechanism 13 and the like.
- a pressure sensor 15 is installed in the arm 16 . Since the arm 16 moves to a position for sucking and discharging liquid, it can rotate and move up and down.
- FIG. 2 is an enlarged view showing the arm 16 and the like in FIG.
- FIG. 2 shows the state immediately after the water 21 for syringe pressure transmission is sucked into the pipe 8 .
- the pipe 8 is filled with water 21 .
- Nozzle 2 contains liquid 22 . Between the water 21 and the liquid 22 there is segmented air 23 . Water 21 has reached the position of pressure sensor 15 .
- the pressure can be transmitted to the liquid 22, and the liquid 22 can be sucked and discharged from the nozzle 2.
- the liquid 22 When the liquid 22 such as a sample is to be sucked, the liquid 22 is sucked after the segmented air 23 for segmenting the liquid 22 is sucked by the nozzle 2 so that the liquid 22 does not mix with the water 21 in the pipe 8 . Further, after ejection, the nozzle 2 is cleaned. In cleaning the nozzle 2, cleaning water is applied to the outer wall of the nozzle 2, and at the same time, the water 21 inside the flow path is pushed out. For pushing out the water 21 in the nozzle 2 during washing, the water 21 can be sent out at a higher pressure than when pushed out by the syringe pump 4 by opening the solenoid valve 5 and using the pressure of the gear pump 6. - ⁇
- the pressure sensor 15 is installed in the pipe 8 in order to detect abnormalities such as clogging of the nozzle 2 and dry suction that may occur during the dispensing operation. Pressure sensor 15 monitors the pressure of water 21 and detects abnormal pressure changes.
- the pressure sensor 15 is installed in the arm 16 in this figure.
- the installation position of the pressure sensor 15 is not limited to the inside of the arm 16 , and may be, for example, a side portion of the sample dispensing mechanism 13 .
- FIG. 3A is an exploded perspective view showing an example of the pressure sensor of FIG. 2.
- FIG. 3B is a longitudinal sectional view showing the pressure sensor of FIG. 3A.
- the pressure sensor 15 has a sensor chip 31, a cap member 34 (cover member), a sensor housing 32, and a cover 40.
- a channel 33 is formed inside the sensor housing 32 . Threaded portions (not shown) are provided at both ends of the channel 33 so that the channel 33 can be connected to the pipe 8 of the dispensing device 1 via a joint.
- the sensor housing 32 is provided with an opening 35 .
- the opening 35 communicates with the channel 33 .
- the opening 35 reaches the outer surface of the sensor housing 32 .
- the opening 35 branches from the flow path 33 toward the outer surface of the sensor housing 32 and reaches the outer surface of the sensor housing 32 .
- a sensor chip 31 is arranged so as to close the opening 35 at the terminal end of the opening 35 located on the outer surface of the sensor housing 32 .
- the sensor chip 31 is bonded to the sensor housing 32 with a sensor chip bonding agent 36 .
- a sensor chip bonding portion composed of the sensor chip bonding agent 36.
- a cap member 34 is bonded to the surface of the sensor chip 31 .
- a printed circuit board 45 is installed in the sensor housing 32 to extract the output from the sensor chip 31 .
- the printed circuit board 45 is electrically connected to the electrodes of the sensor chip 31 by bonding wires 46 .
- the printed board 45 is a glass epoxy board, a flexible printed board, or the like.
- the sensor chip 31 has a diaphragm portion 31a which is its deformed portion.
- a cap member 34 (cover member) is joined to the surface of the sensor chip 31 to protect the diaphragm portion 31a.
- a cover 40 is installed on the outer surface of the sensor housing 32 so as to cover the sensor chip 31 .
- the cover 40 is fixed by adhesion, screwing, snap-fitting, or the like.
- the diaphragm part 31a bends and deforms due to the pressure change of the water 21 flowing through the flow path 33.
- the pressure of the water 21 flowing inside the sensor housing 32 is measured. Strain measurement is performed by a strain gauge mounted on the central surface of the sensor chip 31 .
- FIG. 4 is an exploded perspective view showing the sensor chip portion of the pressure sensor of FIG. 3B.
- the sensor chip 31 is bonded to the terminal end of the opening 35 with a sensor chip bonding agent 36 .
- a diaphragm portion 31 a of the pressure sensor 15 is a portion of the sensor chip 31 facing the opening 35 .
- the opening portion 35 and the diaphragm portion 31a are oval and have different dimensions in the longitudinal direction and the lateral direction.
- the shape of the opening 35 and the diaphragm portion 31a is not limited to an elliptical shape, and may be an elliptical shape, a rectangular shape having curvature at the corners, or the like.
- a cap member 34 is bonded to the surface of the sensor chip 31 with a bonding agent 37a near both ends in the longitudinal direction and a bonding agent 37b near both ends in the width direction.
- a bonding portion composed of the bonding agent 37a near both ends in the longitudinal direction and the bonding agent 37b near both ends in the width direction.
- the vicinity of both ends can be rephrased as "both ends”. Therefore, the bonding agents 37a near both ends in the longitudinal direction are bonding agents provided at both ends in the longitudinal direction, and the bonding agents 37b near both ends in the width direction are bonding agents provided at both ends in the width direction.
- the bonding surface of the bonding agent 37a near both ends in the longitudinal direction is the bonding surface 38a near both ends in the longitudinal direction
- the bonding surface of the bonding agent near both ends 37b in the width direction is the bonding surface 38b near both ends in the width direction.
- the bonding agent 37a adjacent to both ends in the longitudinal direction and the bonding agent 37b adjacent to both ends in the transverse direction include thermosetting adhesives, UV addition adhesives, low-melting-point glass, silver paste, and the like.
- a strain gauge portion 31b for detecting strain is provided in the central portion of the surface of the sensor chip 31 .
- the bonding agent 37a near both ends in the longitudinal direction and the bonding agent 37b near both ends in the transverse direction have the same storage elastic modulus.
- the strain gauge portion 31b When the diaphragm portion 31a is deformed by the pressure from the water 21, the strain gauge portion 31b has a difference in magnitude of strain between the longitudinal direction and the lateral direction of the diaphragm portion 31a.
- the strain gauge portion 31b detects strain in each of the longitudinal and lateral directions and outputs the difference. This is to offset the temperature characteristics of the strain gauge portion 31b.
- the absolute value of the strain in the strain gauge portion 31b is large and that the difference in strain between the longitudinal direction and the lateral direction is large. be.
- the strength of the sensor chip 31 is lowered, and there is concern about deterioration in handleability during manufacture, chip cracking, and the like.
- the cap member 34 is bonded to the sensor chip 31 to ensure strength.
- the rigidity of the diaphragm portion 31a also increases, and the absolute value of strain in the strain gauge portion 31b decreases, resulting in a decrease in sensor sensitivity.
- the joint surfaces 38a near both ends in the longitudinal direction are configured to have a larger joint area than the joint surfaces 38b near both ends in the transverse direction.
- FIGS. 5A to 6B are vertical cross sections passing through the strain gauge portion 31b.
- FIG. 5A is a vertical cross-sectional view showing a deformed state (longitudinal direction) of a conventional pressure sensor during use.
- FIG. 5B is a vertical cross-sectional view of the pressure sensor in FIG. 5A as seen along the lateral direction.
- a difference occurs in the curvature of the strain gauge portion 31b. Specifically, the curvature is greater in the lateral direction than in the longitudinal direction, and the magnitude relationship of tensile strain is ⁇ x1 ⁇ y1. As the sensor output, ⁇ y1 ⁇ x1, which is the difference between them, is output.
- the portion of the sensor chip 31 that is bonded with the sensor chip bonding agent 36 is displaced inward in both the longitudinal direction and the lateral direction (direction from left to right toward the center in the figure). Along with this displacement, the sensor chip bonding agent 36 receives a shearing force from the sensor chip 31 and becomes shear-deformed.
- FIG. 6A is a vertical cross-sectional view showing a deformed state (longitudinal direction) of the pressure sensor of the embodiment when in use.
- FIG. 6B is a vertical cross-sectional view of the pressure sensor of FIG. 6A viewed along the lateral direction.
- the pressure sensor shown in these figures has the cap member 34 attached, even if the sensor chip 31 receives the pressure p from the water 21 (FIG. 3B), the amount of deformation is smaller than that of the conventional example shown in FIGS. 5A and 5B. becomes smaller.
- the longitudinal component is ⁇ x2 and the transverse component is ⁇ y2.
- the sensor output is ⁇ y2 ⁇ x2.
- the rigidity of the cap member 34 suppresses tensile strain.
- the sensor chip bonding agent 36, the bonding agent 37a adjacent to both ends in the longitudinal direction, and the bonding agent 37b adjacent to both ends in the longitudinal direction receive a shearing force from the sensor chip 31 and are shear-deformed. Due to the deformation suppressing effect of the cap member 34, both ⁇ x2 and ⁇ y2 become smaller than when the cap member 34 is not attached. This causes a decrease in sensitivity due to attachment of the cap member 34 .
- the joining surfaces 38a near both ends in the longitudinal direction are configured to have a larger joining area than the joining surfaces 38b near both ends in the width direction. .
- the bonding agent near both ends 37b in the width direction is more likely to undergo shear deformation. That is, the effect of suppressing deformation of the sensor chip 31 by the cap member 34 is relatively strong along the longitudinal direction and relatively weak along the lateral direction.
- the tensile strain ⁇ x2 in the longitudinal direction component decreases relatively greatly, the amount of decrease in the tensile strain ⁇ y2 in the transverse direction component is relatively small. can.
- the strength of the sensor chip 31 can be ensured by the cap member 34, and the sensitivity of the pressure sensor can be maintained.
- each bonding agent is arranged in a line-symmetrical position with respect to the longitudinal direction and the widthwise direction, it does not have to be line-symmetrical. effect is achieved. Also, the shape of the cap member 34 is not limited to the illustrated shape.
- the description is based on the size of the joint area.
- the length of the neighboring joint surfaces 38 a is longer than the major axis of the joint surfaces 38 b near both ends in the transverse direction, that is, the length of the joint surfaces 38 b near both transverse ends near the opening 35 .
- This configuration also matches the configuration of FIG.
- each short axis may differ. This is because the effect of suppressing deformation by the cap member 34 is influenced by the dimension of the long axis rather than the dimension of the short axis among the dimensions of the joint surfaces 38a near both longitudinal ends and the joint surfaces 38b near both longitudinal ends.
- FIG. 7 is a perspective view showing the sensor chip portion of the pressure sensor of this embodiment.
- the cap member 34 and the sensor chip 31 are joined together by a bonding agent 37a near both ends in the longitudinal direction and a bonding agent 77b near both ends in the width direction having the same shape as in the first embodiment. .
- the feature of this embodiment is that the bonding agent 77b near both ends in the transverse direction is selected to have a smaller storage elastic modulus than the bonding agent 37a near both ends in the longitudinal direction.
- the effect of the cap member 34 on suppressing the lateral deformation of the sensor chip 31 can be further reduced. Therefore, the amount of decrease in the tensile strain ⁇ y2 in the transverse direction component is further reduced, and the sensor output ⁇ y2 ⁇ x2 can be increased.
- the configuration of this embodiment is effective, for example, when the bonding area of the cap member 34 is to be increased as much as possible and the sensitivity of the sensor is to be increased.
- the purpose of increasing the bonding area of the cap member 34 is to secure bonding strength, prevent resonance due to external vibration, and the like.
- FIG. 8 is a perspective view showing the sensor chip portion of the pressure sensor of this embodiment.
- the cap member 34 and the sensor chip 31 are bonded together by bonding agents 37a near both ends in the longitudinal direction. No bonding agent is provided in the vicinity of both ends in the width direction. This corresponds to the case where the area (bonding area) of the bonding surfaces 38b near both ends in the transverse direction is zero in the first embodiment.
- the effect of suppressing deformation of the sensor chip 31 in the lateral direction by the cap member 34 is minimized. Therefore, the amount of decrease in the tensile strain ⁇ y2 in the transverse direction component is also the smallest, and the sensor output ⁇ y2 ⁇ x2 can be increased. In addition, since the number of joints is small, it is possible to shorten the process of applying the adhesive with a dispenser in the manufacturing process.
- FIG. 9 is a top view showing a modification of the cap member.
- one rib 94 is provided in the longitudinal direction of the cap member 34 .
- the cap member 34 has one rib 94 provided along the longitudinal direction of the opening 35 .
- the rigidity in the longitudinal direction of the cap member 34 can be increased, and deformation in the longitudinal direction of the cap member 34 can be suppressed. As a result, it is possible to suppress the decrease in the tensile strain ⁇ x2 in the longitudinal direction.
- FIG. 10 is a top view showing another modification of the cap member.
- three ribs 94 are provided in the longitudinal direction of the cap member 34 .
- the rigidity in the longitudinal direction of the cap member 34 can be further increased, and deformation in the longitudinal direction of the cap member 34 can be further suppressed. As a result, it is possible to further suppress the decrease in the tensile strain ⁇ x2 in the longitudinal direction.
- the present invention is not limited to the above-described examples, and includes various modifications.
- the above-described embodiments are described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the described configurations.
- part of the configuration of one embodiment can be replaced with the configuration of another embodiment.
- add the configuration of another embodiment to the configuration of one embodiment.
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Abstract
Description
水21と液体22との間には、分節空気23が入っている。水21は、圧力センサ15の位置に達している。
また、吐出後には、ノズル2の洗浄を行う。ノズル2の洗浄では、ノズル2の外壁に洗浄用の水を当てると同時に、流路内部の水21を押し出す。洗浄時のノズル2内の水21の押し出しには、電磁弁5を開にしてギアポンプ6の圧力を利用することで、シリンジポンプ4で押し出すときよりも高圧で水21を送り出すことができる。
歪みゲージ部31bは、長手方向及び短手方向のそれぞれの歪みを検出し、その差を出力する。これは、歪みゲージ部31bの温度特性を相殺するためである。
ただし、それぞれの短軸が異なっていてもよい。キャップ部材34による変形抑制作用は、長手方向両端近傍接合面38a及び短手方向両端近傍接合面38bの寸法のうち、短軸より長軸の寸法に影響されるからである。
図9は、キャップ部材の変形例を示す上面図である。
Claims (5)
- 長手方向と短手方向とで寸法が異なる開口部を有するセンサ筐体と、
前記開口部を塞ぐように前記センサ筐体に設置されダイアフラム部を形成するセンサチップと、
前記センサチップに設けられた歪みゲージ部と、
前記センサチップにキャップ接合剤で接合されたキャップ部材と、を有し、
前記キャップ接合剤の接合面のうち、前記ダイアフラム部の長手方向両端部の接合面は、前記ダイアフラム部の短手方向両端部の接合面よりも接合面積が大きい、圧力センサ。 - 長手方向と短手方向とで寸法が異なる開口部を有するセンサ筐体と、
前記開口部を塞ぐように前記センサ筐体に設置されダイアフラム部を形成するセンサチップと、
前記センサチップに設けられた歪みゲージ部と、
前記センサチップにキャップ接合剤で接合されたキャップ部材と、を有し、
前記キャップ接合剤の接合面のうち、前記ダイアフラム部の長手方向両端部の接合面の長軸は、前記ダイアフラム部の短手方向両端部の接合面の長軸よりも長い、圧力センサ。 - 長手方向と短手方向とで寸法が異なる開口部を有するセンサ筐体と、
前記開口部を塞ぐように前記センサ筐体に設置されダイアフラム部を形成するセンサチップと、
前記センサチップに設けられた歪みゲージ部と、
前記センサチップにキャップ接合剤で接合されたキャップ部材と、を有し、
前記キャップ部材は、前記開口部の前記長手方向に沿って設けられたリブを有する、圧力センサ。 - 前記キャップ接合剤のうち、前記ダイアフラム部の前記短手方向両端部のキャップ接合剤は、前記ダイアフラム部の前記長手方向両端部のキャップ接合剤よりも貯蔵弾性率が小さい、請求項1又は2に記載の圧力センサ。
- 前記ダイアフラム部の前記短手方向両端部の前記接合面は、前記接合面積が0である、請求項1記載の圧力センサ。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202280049139.8A CN117693671A (zh) | 2021-08-26 | 2022-07-22 | 压力传感器 |
US18/291,964 US20240353278A1 (en) | 2021-08-26 | 2022-07-22 | Pressure Sensor |
EP22861022.6A EP4394342A1 (en) | 2021-08-26 | 2022-07-22 | Pressure sensor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021137759A JP7546531B2 (ja) | 2021-08-26 | 2021-08-26 | 圧力センサ |
JP2021-137759 | 2021-08-26 |
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EP (1) | EP4394342A1 (ja) |
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WO (1) | WO2023026731A1 (ja) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001337103A (ja) * | 2000-05-26 | 2001-12-07 | Matsushita Electric Works Ltd | 半導体加速度センサ |
JP2014055868A (ja) | 2012-09-13 | 2014-03-27 | Azbil Corp | 圧力センサ及びその製造方法並びに部材接合方法 |
JP3207123U (ja) * | 2013-09-12 | 2016-10-27 | ハネウェル・インターナショナル・インコーポレーテッド | 媒体隔離圧力センサ |
JP2018146318A (ja) | 2017-03-03 | 2018-09-20 | 三菱電機株式会社 | 半導体差圧センサ |
DE102019216485A1 (de) * | 2019-10-25 | 2021-04-29 | Raumedic Ag | Konnektor für ein Patienten-Beatmungssystem |
JP2021514056A (ja) * | 2018-02-19 | 2021-06-03 | リーナルセンス リミテッド | センサーユニット |
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2021
- 2021-08-26 JP JP2021137759A patent/JP7546531B2/ja active Active
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2022
- 2022-07-22 WO PCT/JP2022/028419 patent/WO2023026731A1/ja active Application Filing
- 2022-07-22 US US18/291,964 patent/US20240353278A1/en active Pending
- 2022-07-22 CN CN202280049139.8A patent/CN117693671A/zh active Pending
- 2022-07-22 EP EP22861022.6A patent/EP4394342A1/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001337103A (ja) * | 2000-05-26 | 2001-12-07 | Matsushita Electric Works Ltd | 半導体加速度センサ |
JP2014055868A (ja) | 2012-09-13 | 2014-03-27 | Azbil Corp | 圧力センサ及びその製造方法並びに部材接合方法 |
JP3207123U (ja) * | 2013-09-12 | 2016-10-27 | ハネウェル・インターナショナル・インコーポレーテッド | 媒体隔離圧力センサ |
JP2018146318A (ja) | 2017-03-03 | 2018-09-20 | 三菱電機株式会社 | 半導体差圧センサ |
JP2021514056A (ja) * | 2018-02-19 | 2021-06-03 | リーナルセンス リミテッド | センサーユニット |
DE102019216485A1 (de) * | 2019-10-25 | 2021-04-29 | Raumedic Ag | Konnektor für ein Patienten-Beatmungssystem |
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JP2023031956A (ja) | 2023-03-09 |
CN117693671A (zh) | 2024-03-12 |
JP7546531B2 (ja) | 2024-09-06 |
US20240353278A1 (en) | 2024-10-24 |
EP4394342A1 (en) | 2024-07-03 |
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