WO2005054835A1 - ガスセンサ - Google Patents
ガスセンサ Download PDFInfo
- Publication number
- WO2005054835A1 WO2005054835A1 PCT/JP2004/017884 JP2004017884W WO2005054835A1 WO 2005054835 A1 WO2005054835 A1 WO 2005054835A1 JP 2004017884 W JP2004017884 W JP 2004017884W WO 2005054835 A1 WO2005054835 A1 WO 2005054835A1
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- WO
- WIPO (PCT)
- Prior art keywords
- gas
- wiring board
- gas sensor
- ceramic wiring
- gas detection
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
Definitions
- the present invention relates to a gas sensor in which a gas detection element is mounted on a wiring substrate serving as a support.
- the present invention is useful for a gas sensor in which a gas detection element having a diaphragm structure formed using a silicon microfabrication technique is mounted on a wiring board.
- a gas detection element (microsensor chip) is mounted on a package (wiring board) provided with terminals for input / output to an external circuit, and a gas to be measured is introduced into a frame around the package.
- a structure having a structure in which a cover having a plurality of ventilation holes formed thereon is covered and fixed for example, see Patent Document 1.
- the gas detection element is held in a suspended state on a square tubular fixing part via a lead frame, and is fixed by covering the upper part of the fixing part with a lid that has a plurality of ventilation holes for introducing the gas to be measured.
- a structure in which a shielding lid is fixed to the bottom side of the fixing part is also known (for example, see Patent Document 2).
- Patent Document 1 JP-A-11-233240
- Patent Document 2 Japanese Patent Application Laid-Open No. 9-21774
- gas detection accuracy may be reduced.
- metal oxide semi In a gas detection element equipped with a conductor as a gas detection unit if the components generated by the above-mentioned gas generation may be adsorbed on the surface of the gas detection unit, the gas detection accuracy may decrease, but the gas detection accuracy may deteriorate. May deteriorate early.
- the present invention has been made in view of the present situation, and is directed to a gas sensor including a gas detection element mounted on a wiring board, and a protective cap having a vent formed on the wiring board.
- a gas sensor including a gas detection element mounted on a wiring board, and a protective cap having a vent formed on the wiring board.
- the solution is to provide a gas detection element, a ceramic wiring board on which the gas detection element is mounted, and a protective cap mounted on the ceramic wiring board so as to cover the gas detection element.
- a metal protective cap having a gas inlet for introducing a gas to be measured into the gas measuring space from the outside while forming a gas measuring space with the ceramic wiring substrate when mounted on the ceramic wiring board; It is a gas sensor provided with.
- the wiring board is formed of a ceramic wiring board having excellent heat resistance
- the protective cap having a gas inlet is formed of metal having excellent heat resistance.
- the gas sensor of the present invention even when exposed to a high-temperature environment for a long period of time, it does not use a resin package or a protective cap as in the related art, and thus has a ceramic wiring board excellent in heat resistance and a metal Since the protective cap is used, the reliability can be improved from the viewpoint that the deformation hardly occurs.
- the ceramic constituting the ceramic wiring board a material such as alumina, mullite, silicon nitride, or aluminum nitride can be used, and alumina is used for the purpose of obtaining good heat resistance and insulation. Is preferred,.
- the shape of the gas inlet formed in the protective cap is not particularly limited, and may be a through hole, or a linear cut is formed on the outer wall of the protective cap, and this cut is formed. Force A specific portion of the outer wall may be protruded toward the gas measurement space so that one end of the outer wall is connected to the outer wall, so that the outside and the gas measurement space can communicate with each other. Further, the number of gas inlets may be one or more.
- the protective cap is held in a non-adhered state on the ceramic wiring board so as to be a gas sensor.
- the protective cap since the protective cap is held in a non-adhered state on the ceramic wiring board without using an adhesive, gas generation from the adhesive force is prevented.
- the method of holding the protective cap on the ceramic wiring board in a non-adhered state includes fitting and press fitting.
- the ceramic wiring board has a laminated structure in which a plurality of ceramic insulating layers are laminated, and the outermost surface layer that is the outermost surface among the outer surfaces of the ceramic wiring board.
- the protective cap has a hanging projection along the outer surface of the ceramic wiring board, and the protection cap fits into the recess in the hanging projection. It is good to use a gas sensor in which fitting projections are formed.
- a concave portion is formed on an outer surface of a layer other than the uppermost surface layer, which is the outermost surface, of the laminated ceramic wiring board;
- the ceramic wiring board has a substantially square shape when viewed along the stacking direction of the stacked structure, and the recessed portion is formed at least in the outer side surface. It is preferable to use gas sensors provided on two opposite surfaces.
- At least two opposing surfaces of the outer surface of the substantially rectangular ceramic wiring board are provided with depressions, and the depressions are formed on the hanging projections of the protection cap. Since the projections are fitted to each other, the protective cap can be securely fixed to the wiring board.
- a guide recess is provided on the outer side surface of the ceramic wiring board to guide the hanging protrusion to a position where the fitting protrusion fits into the recess. Therefore, it is better to use a gas sensor.
- the guide recess provided on the outer surface of the ceramic wiring board guides the hanging protrusion of the protective cap well to the position where the fitting protrusion fits into the recess.
- the protective cap can be easily fixed to the ceramic wiring board, and incorrect mounting of the protective cap can be prevented.
- the gas detection element has a diaphragm structure, and the diaphragm structure includes a gas detection unit, and the protection cap is formed of the ceramic wiring board.
- the ceiling portion facing the mounting surface on which the gas detection element is mounted has a plurality of the gas intakes, and each of the plurality of gas intakes is a direction orthogonal to the mounting surface from outside the ceiling portion.
- the diaphragm structure of the gas detection element is not visible through the gas inlet, and it is preferable that the gas sensor be formed so as to satisfy the relationship.
- a gas detection element an element in which a gas detection unit is formed on a diaphragm structure formed using a silicon microfabrication technique is known.
- the gas detection element having this structure since the diaphragm structure is formed in a thin plate, the gas detection section and the silicon substrate main body can be thermally isolated, and the gas detection accuracy can be improved. There are points.
- all of the plurality of gas inlets are viewed from the outside of the ceiling along a direction perpendicular to the mounting surface on which the gas detecting element of the ceramic wiring board is mounted. That is, it is formed so as to satisfy the relationship that the diaphragm structure of the gas detection element cannot be visually recognized through the gas inlet when viewed in a direction perpendicular to the mounting surface. This makes it difficult for the foreign matter that has entered the gas intake rocker to adhere to the gas detector formed in the diaphragm structure. Further, it is possible to effectively prevent the diaphragm structure from being damaged due to the impact of foreign matter, which is unlikely to directly collide with the diaphragm structure through the gas inlet.
- the gas detection element is provided with an element-side electrode
- the ceramic wiring board is provided with a substrate-side electrode
- the element-side electrode and the substrate-side electrode are provided.
- a connection portion for connecting to an electrode is provided, and each of the plurality of gas intakes is formed through the gas intake when viewed along a direction orthogonal to the ceiling external force and the mounting surface. It is preferable to use a gas sensor that is formed so as to satisfy the relationship where the part is not visible.
- each of the plurality of gas inlets is viewed from the outside of the ceiling along a direction perpendicular to the mounting surface on which the gas detection element of the ceramic wiring board is mounted, that is, the ceiling.
- the connection portion connecting the element-side electrode and the substrate-side electrode through the gas inlet is formed so as to satisfy a relationship in which the connection is not visible. This makes it difficult for the foreign matter that has entered the gas intake rocker to adhere to the connection part, and also prevents the foreign matter from short-circuiting the wiring of the connection part.
- the gas detection element has a diaphragm structure, and the diaphragm structure has a gas detection unit, and the ceramic wiring board has a plurality of ceramic insulation layers.
- a hollow structure is formed in a portion of the plurality of ceramic insulating layers facing the diaphragm structure portion of the ceramic insulating layer on which the gas detection element is mounted, among the plurality of ceramic insulating layers.
- a good gas sensor is good.
- a gas detection element having such a diaphragm structure
- the heating of the gas detection unit is controlled by a micro heater or the like formed in the diaphragm structure
- the internal pressure of the diaphragm structure increases to increase the gas pressure in the same structure.
- the part may be damaged.
- the ceramic wiring board has a laminated structure in which the internal wiring layer is formed between the plurality of ceramic insulating layers, the wiring between the gas detection element and the external electrode is formed. Degree of freedom can be increased.
- the gas detection portion is formed by a micro heater or the like formed in the diaphragm structure portion.
- a bottom surface of the ceramic wiring board opposite to a side on which the gas detection element is mounted is formed substantially in a plane, and the bottom surface of the gas sensor is It is recommended that a gas sensor be provided with external electrodes that are electrically connected to the circuit board to which is attached.
- the bottom surface of the ceramic wiring board is formed substantially flat, and the external electrodes connected to the gas detection elements are formed on the bottom surface.
- the ceramic wiring board (the gas sensor itself) can be surface-mounted.
- the occupancy of the gas sensor mounted on the circuit board (the ratio of the area occupied in the mounting) can be minimized, and the mounting process on the circuit board can be simplified.
- the plurality of gas detection elements reacting to different gas types be a gas sensor mounted on the ceramic wiring board.
- the different gas types are, specifically, an oxidizing gas such as NOx and a reducing gas such as CO and HC. Oxidizing gas.
- FIG. 1 is an exploded perspective view of a gas sensor 1 according to one embodiment of the present invention.
- FIG. 2 is a plan view of the gas sensor 1.
- FIG. 3 is a bottom view of the gas sensor 1.
- FIG. 4 is a plan view of a ceramic wiring board 2.
- FIG. 5 is a cross-sectional view of the ceramic wiring board 2 taken along line AA in FIG.
- FIG. 6 is a plan view of a gas detection unit 12 of the gas detection element 8.
- FIG. 7 is a plan view of the ceramic wiring board 2 with a protective cap 3 removed.
- FIG. 8 is a cross-sectional view of the ceramic wiring board 2 taken along line BB shown in FIG.
- FIG. 9 is a plan view of the ceramic wiring board 2 with the protective cap 3 removed.
- FIG. 10 is a cross-sectional view of the ceramic wiring substrate 2 taken along line DD shown in FIG.
- FIG. 11 is a cross-sectional view of the gas sensor 1 taken along line CC shown in FIG.
- FIG. 12 is an exploded perspective view of a gas sensor 100 according to another embodiment (modification) of the present invention.
- FIG. 13 is a cross-sectional view of the gas sensor 100 taken along line EE shown in FIG.
- Second layer (ceramic insulating layer)
- FIG. 1 is an exploded perspective view of a gas sensor 1 according to an embodiment of the present invention
- FIG. 2 is a plan view of the gas sensor 1
- the present invention can be applied to various gas sensors that detect a specific gas in a gas to be measured.
- the gas sensor 1 of the present embodiment is, for example, a reducing gas such as CO or HC or an oxidizing gas such as NOx.
- a gas sensor that detects a change in concentration of a gas will be described as an example.
- the gas sensor 1 is provided, for example, near a front grill in an engine room of an automobile, detects a change in the concentration of CO, HC, or NOx in the environmental gas, and introduces outside air and air circulation of the air conditioning control device. It is used for switching air conditioning sensors.
- the gas sensor 1 is formed in a substantially rectangular parallelepiped shape, and is attached to the ceramic wiring board 2 so as to cover an opening of a cavity formed in the ceramic wiring board 2.
- the protective cap 3 is mounted on the upper cap in FIG. Ceramic wiring board 2 has a laminated structure in which gas detecting elements 8 and 9 formed in a diaphragm structure are mounted in a cavity.
- the protective cap 3 has a planar ceiling portion 30 and hanging projections 41 and 42 extending downward from the ceiling portion 30 in FIG. 1.
- the protective cap 3 is formed by pressing a stainless steel plate. It is formed.
- the ceiling portion 30 is formed in a substantially rectangular shape in a plan view.
- the ceiling portion 30 has a substantially circular vent hole 31, 32, 32 in plan view for allowing the gas to be measured to enter the inside of the gas sensor 1 (inside the cavity). , 33, 34, 35, 36, 37, 38, 39 are provided.
- a gas measurement space S is formed between the protective cap 3 and the ceramic wiring board 2.
- the ventilation holes 31-39 correspond to the “gas intake” of the present invention, and the gas to be measured is guided to the external force gas measurement space S through these ventilation holes 31-39.
- the bottom surface 1 A of the gas sensor 1 (in other words, the bottom surface of the ceramic wiring board 2) is formed in a substantially rectangular plane, and the bottom surface 1 A has an unshown surface.
- Substantially rectangular external electrodes 51A, 51B, 51C, 51D, 51E, 51F joined to the circuit board by soldering or the like are provided.
- an Au plating film is formed on the surface of the external electrodes 51A, 51B, 51C, 51D, 51E, 51F.
- FIG. 4 is a plan view of the ceramic wiring board 2
- FIG. 5 is a cross-sectional view of the ceramic wiring board 2 taken along line AA of FIG.
- the ceramic wiring board 2 is shown in FIG. 1 from four layers of a first layer 4, a second layer 5, a third layer 6, and a fourth layer 7 from bottom to top.
- the side of the ceramic wiring board 2 on which the gas detection elements 8 and 9 are mounted is referred to as a front surface, and the opposite side is referred to as a bottom surface. That is, in the ceramic wiring board 2 (laminated structure) of the gas sensor 1 in the present embodiment, the cavity is formed, the side on which the two gas detection elements 8 and 9 are mounted is the front surface, and the opposite side is the bottom surface 1A. And The surface of the ceramic wiring board 2 means a portion where the surface force is visible when the ceramic wiring board 2 is viewed in the direction of the force toward the bottom surface. Note that, on the surfaces of the first layer 4 and the third layer 6 of the multilayer structure, internal wiring (not shown) is formed to constitute an internal wiring layer. As shown in FIG.
- a guide recess 2A is provided on one side (left side in FIG. 1) 2S in the short direction of the ceramic wiring board 2 so as to penetrate through the first layer 41 and the fourth layer 7.
- a guide recess 2B is also provided penetrating through the first layer 4 and the fourth layer 7.
- a recess deeper than the guide recess 2A in the longitudinal direction of the ceramic wiring board 2 is provided on one side surface 2S in the short direction of the lowermost first layer 4.
- a fitting portion 4A is provided, and a fitting portion 4B, which is a recess deeper than the guide recess 2B, is also provided on the right side surface 2R of the first layer 4.
- an internal pressure adjusting recess 5A for adjusting the internal pressure in the diaphragm structure described later extends in the longitudinal direction at the center of the second layer 5 in the lateral direction.
- a through hole is formed near the center of the third layer 6, penetrating the third layer 6, and near the center of the fourth layer 7, penetrating the fourth layer 7 and penetrating the third layer 6. Through holes having openings larger than the holes are formed, and cavities are formed by wall surfaces forming these through holes.
- plate-like gas detection elements 8 and 9 each having a substantially rectangular shape in a plan view are arranged in parallel and adhered to the upper surface of the second layer 5.
- FIG. 6 is a plan view of the gas detection unit 12 of the gas detection element 8.
- These gas detection elements 8 and 9 include Gas detectors 12, 13 each having a substantially square shape in plan view for detecting a specific gas in the gas to be measured are formed, and recesses 6A, 6C are formed on the back surface thereof, as shown in FIG.
- the diaphragm structures 6B and 6D are provided.
- a micro heater having a Pt wiring force (not shown) is incorporated in the diaphragm structures 6B and 6D. Further, as shown in FIG.
- the gas detection section 12 is provided on the upper surface of the gas detection element 8 having a substantially vertically long rectangular shape, near the rear side surface 2Q.
- the gas detection unit 13 is also arranged on the upper surface of the gas detection element 9 in the same manner.
- the gas detection section 12 of the gas detection element 8 has a substantially square shape in plan view, and has a detection electrode 12A formed in contact with a gas-sensitive film (not shown) at the center thereof. Is provided.
- the gas detector 13 has the same structure as the gas detector 12.
- connection electrodes 14A, 14B, 14C, and 14D for supplying power to the power supply are formed.
- electrode pads for connection electrodes 15A, 15B, 15C, and 15D are formed on the upper surface of gas detection element 9 near the short side 2P.
- electrode pads of the connection electrodes 16A, 16B, 18A, 18B and the common electrode 17 are provided on the upper surface of the third layer 6 near the connection electrodes 14A to 14D and 15A to 15D.
- connection electrodes 14A, 14B, 15C, 15D are wire-bonded to the connection electrodes 16A, 16B, 18A, 18B by Au wires 20A, 20B, 21C, 21D, respectively, and the connection electrodes 14C, 14D, 15A, 15B are
- the common electrodes 17 are connected to the common electrode 17 by Au wires 20C, 20D, 21A, and 21B.
- the connection electrodes 14A to 14D and 15A to 15D correspond to the "element-side electrodes" of the present invention, and the connection electrodes 16A, 16B, 18A and 18B and the common electrode 17 correspond to the "substrate-side electrodes" of the present invention.
- the Au wires 20A, 20B, 21C, and 21D correspond to the “connection portion” of the present invention.
- the cut sheet is in a state where many layers of the ceramic wiring board 2 are connected. Therefore, a sheet in which a large number of first layers 4 are connected (hereinafter, referred to as “first layer sheet”). , A sheet in which a number of second layers 5 are connected (hereinafter referred to as “second layer sheet”), a sheet in which a number of third layers 6 are connected (hereinafter referred to as “third layer sheet”), and a fourth layer A sheet (hereinafter, referred to as a “fourth layer sheet”) in which a number of 7 are connected is manufactured. Next, a W (tungsten) paste is printed on each of the unsintered first and third layer sheets to form a wiring pattern serving as an internal wiring layer.
- the first-layer sheet and the fourth-layer sheet are laminated and pressed to form a laminated sheet.
- a cutting groove is formed so that the pressed laminated sheet is easily divided into pieces after firing.
- the laminated sheet is cut into a size for firing, degreased, and fired.
- the electrodes are subjected to Ni plating, Au plating, etc., inspected for electrical characteristics, current leakage characteristics, appearance, etc., and divided into individual ceramic wiring boards 2.
- a silicon wafer serving as a base material of the gas detection elements 8 and 9 is cleaned.
- an oxide silicon film and a silicon nitride film are formed on the silicon wafer.
- a micro heater is formed.
- a silicon nitride film is formed so as to cover the micro heater.
- a micro heater contact portion is formed at the end of the micro heater.
- a silicon nitride film is etched to form a micro heater contact portion.
- a detection electrode is formed above the micro heater.
- a Ti layer by sputtering a Pt layer is formed, a pattern is formed by photolithography, and a detection electrode is formed by etching.
- contact pads connection electrodes 14A to 14D, 15A to 15D
- connection electrodes 14A to 14D, 15A to 15D are formed on the end of the detection electrode and the end of the micro heater.
- an Au layer is formed, pattern jungling is performed by photolithography, and connection electrodes 14A to 14D and 15A to 15D are formed by etching.
- the diaphragm structures 6B and 6D are formed by anisotropic etching of silicon, and a metal oxide semiconductor mainly composed of SnO is formed.
- a gas sensitive film is formed. Thereafter, the silicon wafer is cut, and the gas detection elements 8 and 9 are cut out.
- FIG. 7 is a plan view of the wiring board 2 with the protective cap 3 removed
- FIG. 8 is a cross-sectional view of the ceramic wiring board 2 taken along line BB shown in FIG.
- the ceramic wiring board 2 has gas detection elements 8 and 9 fixed on the second layer 5 with an adhesive 62 as shown in FIGS. 7 and 8.
- a sealing member 61 for protecting B, 20C, 20D, 21A, 21B, 21C, and 21D is provided.
- the sealing member 61 is made of a synthetic resin having a cross section bonded between the gas detection portions 12 and 13 of the gas detection elements 8 and 9 and the connection electrodes 14A-14D and 15A-15D (
- the dam member 60 prevents the sealing member 61 before solidification from flowing and adhering to the gas detecting portions 12 and 13 of the gas detecting elements 8 and 9.
- connection electrodes 14A-14D, 15A-15D, the connection electrodes 16A, 16B, 18A, 18B, the common electrode 17, and the Au wires 20A, 20B, 20C, 20D, 21A, 21B, 21C, 21D It is sealed and protected by a sealing member 61. Therefore, connection electrodes 14A-14D, 15A-15D, connection electrodes 16A, 16B, 18A, 18B, common electrode 17, and Au wires 20A, 20B, 20C, 20D, 21A, 21B, 21C, 21D may be damaged by foreign matter. No short circuit due to foreign matter.
- FIG. FIG. 9 is a plan view of the ceramic wiring board 2 with the protective cap 3 removed
- FIG. 10 is a cross-sectional view of the ceramic wiring board 2 taken along line DD shown in FIG.
- the force sealing member 63 using the sealing member 63 is different from the sealing member 61 in that it has a high viscosity even before solidification and a resin having low fluidity (for example, high resin). Viscosity epoxy resin). Therefore, as shown in FIGS.
- the sealing member 63 is attached to the gas detecting portions 12 and 13 of the gas detecting elements 8 and 9.
- the dam member 60 for preventing adhesion is unnecessary, and the connection electrodes 14A-14D, 15A-15D, the connection electrodes 16A, 16B, 18A, 18B, the common electrode 17, and the Au wires 20A, 20B, 20C, 20D, 21A , 21B, 21C, and 21D are sealed and protected by only the sealing member 63. Therefore, there is no need to bond the dam member 60 on the gas detection elements 8 and 9.
- FIG. 11 is a cross-sectional view of only the protective cap 3 of the gas sensor 1 taken along the line CC shown in FIG.
- the protective cap 3 is formed by pressing a stainless steel plate as described above, and has a substantially rectangular ceiling portion 30 in plan view.
- the ceiling portion 30 is composed of hanging projections 41 and 42 which are perpendicular to the ceiling portion 30 from the longitudinal end surfaces thereof and are bent downward along the outer side surface of the ceramic wiring board 2.
- the hanging projections 41 and 42 are each formed in a substantially rectangular plate shape, and fitting projections 41A and 42A are punched inward by press molding and protrude from the lower ends thereof. ing.
- the fitting projections 41A and 42A are fitted to fitting portions 4A and 4B respectively provided on two opposing outer surfaces of the ceramic wiring board 2 as shown in FIG. 3 and FIG. I'm familiar.
- the protective cap 3 When the protective cap 3 is attached to the ceramic wiring board 2, the hanging projections 41, 42 are guided by the guide recesses 2 A, 2 B provided on the outer surface in the longitudinal direction of the ceramic wiring board 2, respectively.
- the protective cap 3 is pushed in until the back surface of the ceiling portion 30 contacts the upper surface of the fourth layer 7, and the fitting protrusions 41A, 42A provided on the hanging protrusions 41, 42 respectively fit into the fitting portions 4A, 4B. Each fits.
- the protective cap 3 is attached and fixed to the ceramic wiring board 2, and forms a gas measurement space S with the ceramic wiring board 2.
- a substantially circular ventilation hole 31-39 is formed in the ceiling portion 30 of the protective cap 3 so that the gas to be measured enters the inside of the gas sensor 1 (gas measurement space S). ing.
- the ventilation holes 31-39 are not randomly provided, and the ventilation holes 31-39 and the diaphragm structures 6B and 6D are orthogonally projected on a plane extending horizontally on the surfaces of the gas detection elements 8 and 9.
- the gas detectors 12 and 13 of the diaphragm structure should be installed so that the orthographic images of the vents 31-39 do not overlap the orthographic images of the diaphragm structures 6B and 6D. Vent holes 31-39 are located avoiding the top.
- each of the plurality of ventilation holes 31 to 39 is orthogonal to the mounting surface of the ceramic wiring board 2 on which the gas detection elements 8 and 9 are mounted from outside the ceiling 30.
- the diaphragm structures 6B and 6D of the gas detection elements 8 and 9 are formed so as to satisfy a relationship that cannot be visually recognized through the ventilation holes 31 and 39!
- a flat portion 30A is formed on the ceiling portion 30 of the protective cap 3 so that the suction nozzle of the chip mounter can abut. Therefore, the gas sensor 1 has a flat portion 30A on the ceiling portion 30 of the protective cap 3 to which the suction nozzle of the chip mounter can abut, and the bottom surface 1A of the first layer 4 of the ceramic wiring board 2 has a substantially rectangular shape.
- the gas sensor 1 is formed in a flat surface and has substantially rectangular external electrodes 51A, 51B, 51C, 51D, 51E, and 51F. The surface mounting of the gas sensor 1 is possible at the same time using the mounter.
- the ventilation holes 31-39 provided in the ceiling portion 30 of the protective cap 3 are ventilation holes 31-39 and a connection portion on a plane extending horizontally on the surface of the gas detection elements 8,9.
- the 11-wire 20-, 20-B, 20B, 20B, 20B They are arranged so that they do not overlap the orthogonally projected images of 20C, 20D, 21A, 21B, 21C, and 21D. That is, the ventilation holes 31-39 are arranged so as not to be directly above the Au wires 20A, 20B, 20C, 20D, 21A, 21B, 21C, 21D (connection portions).
- the gas sensor 1 Each of the plurality of air holes 31-39 is formed through the air holes 31-39 when viewed from the outside of the ceiling 30 along a direction perpendicular to the mounting surface of the ceramic circuit board 2 on which the gas detection elements 8, 9 are mounted.
- the Au wires 20A, 20B, 20C, 20D, 21A, 21B, 21C, and 21D, which are connection portions, are formed so as to satisfy an invisible relationship.
- the orthographic images of the ventilation holes 31-39 show the orthographic views of the Au wires 20A, 20B, 20C, 20D, 21A, 21B, 21C, 21D and the connection. Vent holes 31-39 may be arranged so as not to overlap the orthogonally projected images of electrodes 14A-14D, 15A-15D, connection electrodes 16A, 16B, 18A, 18B and common electrode 17.
- connection electrodes 14A-14D, 15A-15D which are connected only with the SAu wires 20A, 20B, 20C, 20D, 21A, 21B, 21C, 21D, It is difficult for the connecting electrodes 16A, 16B, 18A, 18B and the common electrode 17 to adhere to each other, and foreign matter does not short-circuit between these electrodes.
- the protective cap 3 has a recess for checking the directivity so that the direction of the gas sensor 1 can be checked when the gas sensor 1 is mounted on a circuit board or the like (not shown). Is provided.
- the recess 40 is formed in a substantially arc shape in plan view at the left side of the center of the long side on one side of the protective cap 3 when the protective cap 3 is viewed in plan.
- FIGS. 1 and 2 a gas sensor 100 according to another embodiment of the present invention will be described with reference to FIGS.
- This gas sensor 100 differs from the gas sensor 1 according to the above-described embodiment only in the form of the ventilation holes 31 to 39 of the protective cap 3 shown in FIGS. 1 and 2. Therefore, only different portions will be described, and description of similar portions will be omitted or simplified.
- the protection cap 103 constituting the gas sensor 100 forms a gas measurement space S with the ceramic wiring board 2 when mounted on the ceramic wiring board 2, A portion 30 and hanging projections 41 and 42 are provided.
- a plurality of ventilation holes 131-137 are formed in the ceiling portion 30 of the protection cap 103.
- a straight line in a direction parallel to the longitudinal direction of the ceiling portion 30 having a substantially rectangular shape in plan view is provided in the protective cap 103.
- a claw-like portion is formed by protruding a specific portion of the specific portion toward the gas measurement space S in such a manner that one end of the specific portion is continuous with the outer wall (the flat portion 30A) of the ceiling portion 130, thereby forming a claw-like portion 131A-137A.
- the gas to be measured is taken into the gas measurement space S from the outside through the ventilation holes 131 to 137 along the claw portions 131A to 137A, and the ceramic wiring substrate 2
- the gas detection elements 8 and 9 mounted on the sensor detect changes in the concentration of the specific gas.
- the gas sensor 100 since the ventilation holes 131-137 having the claw-shaped portions 1 31 A-137 A are formed in the ceiling 30 of the protection cap 103! / ⁇ , the gas sensor 100 is perpendicular to the ceiling 30 of the protection cap 103.
- the plurality of vents 131 to 137 also have the external force of the ceiling portion 30 in the direction orthogonal to the mounting surface of the ceramic wiring board 2 on which the gas detection elements 8 and 9 are mounted.
- the diaphragm structures 6B, 6D of the gas detection elements 8, 9 and the Au wires 20A, 20B, 20C, 20D, 21A, 21B, 21C, 21D, which are the connection parts, are formed through the ventilation holes 131-137. It is formed so as to satisfy the relationship that cannot be visually recognized. Note that the above-described vents 131-137 correspond to the "gas intake" of the present invention.
- the wiring board 2 of the gas sensor 1 has a four-layer laminated structure.
- the force is not necessarily limited to a four-layer structure, but may be a two-layer, three-layer, five-layer, six-layer, or other multilayer structure.
- the gas sensor 1 incorporates two gas detection elements. This may be one or three.
- the material of the gas detection units 12, 13 formed in the gas detection elements 8, 9 is not particularly limited as long as it can detect a specific gas in the gas to be measured, and the gas detection units are formed as a thick film. Or even a thin film! ,.
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- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/581,075 US7712349B2 (en) | 2003-12-01 | 2004-12-01 | Gas sensor |
EP04819870.9A EP1705479B1 (en) | 2003-12-01 | 2004-12-01 | Gas sensor |
Applications Claiming Priority (4)
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JP2003401382A JP4381117B2 (ja) | 2003-12-01 | 2003-12-01 | センサ素子実装パッケージ |
JP2003401386 | 2003-12-01 | ||
JP2003-401386 | 2003-12-01 | ||
JP2003-401382 | 2003-12-12 |
Publications (1)
Publication Number | Publication Date |
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WO2005054835A1 true WO2005054835A1 (ja) | 2005-06-16 |
Family
ID=34656183
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/017884 WO2005054835A1 (ja) | 2003-12-01 | 2004-12-01 | ガスセンサ |
Country Status (4)
Country | Link |
---|---|
US (1) | US7712349B2 (ja) |
EP (1) | EP1705479B1 (ja) |
KR (1) | KR20060096517A (ja) |
WO (1) | WO2005054835A1 (ja) |
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JP2010258079A (ja) * | 2009-04-22 | 2010-11-11 | Ngk Spark Plug Co Ltd | センサ素子実装パッケージ |
JP2012500352A (ja) * | 2008-08-15 | 2012-01-05 | シーメンス エナジー インコーポレイテッド | 高温環境用の無線遠隔測定電子回路パッケージ |
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US20130333445A1 (en) * | 2012-06-04 | 2013-12-19 | Eif - Astute | Analyzer for fluids containing an inflammable substance and corresponding method |
US9851336B2 (en) * | 2013-09-16 | 2017-12-26 | Lg Innotek Co., Ltd. | Gas sensor package |
CN104458865B (zh) * | 2013-09-16 | 2018-11-16 | Lg伊诺特有限公司 | 气体传感器组件 |
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JP6304989B2 (ja) * | 2013-09-24 | 2018-04-04 | 株式会社東芝 | 圧力センサ、マイクロフォン、血圧センサ、タッチパネル、圧力センサの製造方法、および圧力センサの製造装置 |
JP5740462B2 (ja) * | 2013-12-16 | 2015-06-24 | 日本写真印刷株式会社 | ガス検出装置 |
JP6235415B2 (ja) * | 2014-06-10 | 2017-11-22 | アルプス電気株式会社 | 湿度検知装置 |
KR20160061842A (ko) * | 2014-11-24 | 2016-06-01 | 엘지이노텍 주식회사 | 가스 센서 패키지 및 그 제조 방법 |
JP6450612B2 (ja) * | 2015-03-11 | 2019-01-09 | 日本特殊陶業株式会社 | 電子部品装置およびその製造方法 |
KR102522099B1 (ko) * | 2016-01-14 | 2023-04-17 | 엘지이노텍 주식회사 | 센서 및 이의 제조 방법 |
US10186468B2 (en) * | 2016-03-31 | 2019-01-22 | Infineon Technologies Ag | System and method for a transducer in an eWLB package |
KR102466332B1 (ko) * | 2018-01-02 | 2022-11-15 | 삼성전자주식회사 | 가스 센서 패키지 |
JP2022020159A (ja) * | 2020-07-20 | 2022-02-01 | Tdk株式会社 | センサーモジュール |
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-
2004
- 2004-12-01 EP EP04819870.9A patent/EP1705479B1/en not_active Expired - Fee Related
- 2004-12-01 KR KR1020067013223A patent/KR20060096517A/ko active Search and Examination
- 2004-12-01 US US10/581,075 patent/US7712349B2/en not_active Expired - Fee Related
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012500352A (ja) * | 2008-08-15 | 2012-01-05 | シーメンス エナジー インコーポレイテッド | 高温環境用の無線遠隔測定電子回路パッケージ |
JP2010258079A (ja) * | 2009-04-22 | 2010-11-11 | Ngk Spark Plug Co Ltd | センサ素子実装パッケージ |
Also Published As
Publication number | Publication date |
---|---|
EP1705479B1 (en) | 2016-11-16 |
EP1705479A4 (en) | 2010-09-15 |
US7712349B2 (en) | 2010-05-11 |
EP1705479A1 (en) | 2006-09-27 |
US20070107493A1 (en) | 2007-05-17 |
KR20060096517A (ko) | 2006-09-12 |
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