WO2022131181A1 - 基板、パッケージ、センサ装置、および電子機器 - Google Patents
基板、パッケージ、センサ装置、および電子機器 Download PDFInfo
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- WO2022131181A1 WO2022131181A1 PCT/JP2021/045724 JP2021045724W WO2022131181A1 WO 2022131181 A1 WO2022131181 A1 WO 2022131181A1 JP 2021045724 W JP2021045724 W JP 2021045724W WO 2022131181 A1 WO2022131181 A1 WO 2022131181A1
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- 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
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- 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
- G01N27/121—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 for determining moisture content, e.g. humidity, of the fluid
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- 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
- G01N27/125—Composition of the body, e.g. the composition of its sensitive layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/02—Containers; Seals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/02—Containers; Seals
- H01L23/06—Containers; Seals characterised by the material of the container or its electrical properties
- H01L23/08—Containers; Seals characterised by the material of the container or its electrical properties the material being an electrical insulator, e.g. glass
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1058—Manufacture or assembly
- H04R1/1066—Constructional aspects of the interconnection between earpiece and earpiece support
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/44—Special adaptations for subaqueous use, e.g. for hydrophone
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/46—Manufacturing multilayer circuits
Definitions
- the present disclosure relates to a substrate and a package on which an element is mounted, a sensor device on which the element is mounted, and an electronic device including the device.
- Various sensors are installed in mobile devices such as smartphones.
- the waterproof property is improved by attaching a waterproof sheet to the housing of the device.
- the sheet usually used as a waterproof sheet is expensive.
- a process of attaching a waterproof sheet to the inside of the housing is required.
- Patent Document 1 discloses a waterproof cover structure having microchannels having a diameter of 0.1 mm to 0.6 mm and a length of 1 mm to 5 mm.
- Patent Document 2 discloses a plate-shaped waterproof member made of silicon (Si) or the like.
- the waterproof member has a plurality of through holes penetrating the upper and lower surfaces thereof.
- the substrate according to one aspect of the present disclosure is a ceramic insulating layer that is laminated with respect to the first layer, which is a ceramic insulating layer having a plurality of first through holes, and has at least one second through hole.
- the second layer is included.
- the diameter of the first through hole is 10 to 50 ⁇ m
- the diameter of the second through hole is larger than the diameter of the first through hole
- at least a part of the plurality of first through holes is the first through hole. It is located at a position overlapping the second through hole in the plan view of one layer.
- the package according to one aspect of the present disclosure includes the substrate as a lid, and a wiring board having a housing recess for accommodating a sensor element and wiring.
- the first layer is on the side of the accommodating recess.
- the diameter of the second through hole is 100 ⁇ m or more and 200 ⁇ m or less.
- the sensor device includes the substrate and a sensor element.
- the sensor device includes the above-mentioned package and a sensor element.
- the electronic device includes the sensor device.
- the package according to one aspect of the present disclosure includes a first substrate having an accommodating recess for accommodating a sensor element, and a second substrate for closing the accommodating recess.
- the second substrate is a second layer, which is a ceramic insulating layer having a plurality of first through holes, and a second layer, which is laminated with respect to the first layer and has at least one second through hole. Including layers.
- the diameter of the first through hole is 10 to 50 ⁇ m.
- the diameter of the second through hole is larger than the diameter of the first through hole.
- At least a part of the plurality of first through holes is located at a position overlapping the second through holes in the plan view of the first layer.
- the second layer is on the side of the accommodating recess.
- a sensor element is mounted on the substrate according to one aspect of the present disclosure.
- the substrate includes a first layer which is a ceramic insulating layer having a plurality of first through holes, and a second layer which is a ceramic insulating layer laminated to the first layer and having at least one second through hole.
- On the surface of the second layer it has a frame portion located so as to surround the first through hole and the second through hole, and a wiring conductor.
- the diameter of the first through hole is 10 to 50 ⁇ m.
- the diameter of the second through hole is larger than the diameter of the first through hole.
- At least a part of the plurality of first through holes is located at a position overlapping the second through holes in the plan view of the first layer.
- the sensor device includes the substrate and a sensor element.
- the sensor device includes the above-mentioned package and a sensor element.
- the electronic device includes the sensor device.
- FIG. 1 is a cross-sectional view of an exemplary substrate 1 according to the first embodiment of the present disclosure when the substrate 1 is cut along a plane perpendicular to the substrate 1 and parallel to the X-axis direction.
- the XY plane is a plane parallel to the upper surface or the bottom surface of the substrate 1
- the Z axis is an axis perpendicular to the XY plane.
- the cross-sectional view of the substrate in the present specification is a cross-sectional view when cut in the same plane as in FIG.
- the cross-sectional view of the package including the substrate and the sensor device which will be described later, is also a cross-sectional view when cut in the same plane as in FIG. 1 unless otherwise specified.
- the substrate 1 has a configuration in which a first layer 10 having a plurality of first through holes 101 and a second layer 11 having at least one second through hole 111 are laminated. ing.
- the first layer 10 has a first surface 102 constituting one outer surface of the substrate 1 and a second surface 103 on the side facing the second layer 11.
- the second layer 11 has a second surface 112 constituting the other outer surface of the substrate 1 and a second surface 113 on the side facing the first layer 10.
- the first layer 10 and the second layer 11 are each insulated from an insulating material including a ceramic material such as an aluminum oxide sintered body, a glass ceramic sintered body, a mulite material sintered body, or an aluminum nitride material sintered body. It is a layer.
- the substrate 1 when the substrate 1 is viewed in a plan view from the side of the second surface 112, a plurality of first through holes 101 overlap with one second through hole 111.
- the substrate 1 has, for example, a rectangular shape such as a rectangular shape or a square shape in a plan view.
- the thickness T1 of the first layer 10 is 50 ⁇ m or more and 150 ⁇ m or less.
- the first through hole 101 is, for example, circular, and its diameter D1 is 10 ⁇ m or more and 50 ⁇ m or less.
- the diameter of the first through hole is not constant in the depth direction, the smallest diameter is 10 ⁇ m or more and 50 ⁇ m or less.
- the diameter D1 of the first through hole 101 is different between the 1-1 surface 102 and the 1-2 surface 103, the smaller diameter is 10 ⁇ m or more and 50 ⁇ m or less.
- the thickness T2 of the second layer 11 is 50 ⁇ m or more and 200 ⁇ m or less.
- the second through hole 111 is, for example, circular, and its diameter D2 is larger than the diameter D1 of the first through hole 101.
- the diameter D2 of the second through hole 111 is, for example, 0.5 mm or more and 2 mm or less.
- the cross-sectional shape of the first through hole 101 and the second through hole 111 on the plane parallel to the substrate 1 (XY plane) is not limited to a circle, and is a polygon such as a quadrangle as shown in FIG. 10 described later. It may be in shape.
- the dimensions of the first through hole 101 and the second through hole 111 correspond to, for example, the lengths of the sides of the rectangle corresponding to the diameters D1 and D2.
- FIG. 1 shows an example in which the substrate 1 is composed of two layers, a first layer 10 and a second layer 11, but the substrate 1 is not limited to the two layers.
- the substrate 1 may be such that the first layer 10 and the second layer 11 are directly laminated, or the substrate 1 may be laminated with another layer interposed therebetween.
- the substrate 1 is, for example, a laminated body (ceramic body) containing an aluminum oxide sintered body, and can be manufactured as follows. That is, first, a ceramic green sheet (green sheet) to be the first layer 10 and the second layer 11 is produced. Raw material powders such as aluminum oxide and silicon oxide are formed into a sheet together with an appropriate organic binder and an organic solvent to prepare a plurality of square sheet-shaped ceramic green sheets.
- the first through hole 101 is formed, for example, by drilling a ceramic green sheet corresponding to the first layer 10 using a mold or the like.
- the pore diameter at the time of drilling is a size such that the pore diameter after firing is 10 ⁇ m or more and 50 ⁇ m or less.
- the second through hole 111 is formed, for example, in a ceramic green sheet corresponding to the second layer 11 by using a mold or the like.
- the first through hole 101 and the second through hole 111 may be formed by using a laser.
- these ceramic green sheets are laminated to prepare a laminated body.
- the substrate 1 can be manufactured by firing this laminate at a temperature of 1300 to 1600 ° C.
- the holes formed in the green sheet are about 10% to 20% larger than the diameters of the first through hole 101 and the second through hole 111 after firing. It can be a hole diameter.
- the ceramic green sheet before firing is a soft material, it is easy to make fine holes as described above. Therefore, when the substrate 1 is formed from the ceramic laminate, it is easy to form fine through holes having a diameter of 100 ⁇ m or less, which is generally difficult with a metal substrate or an organic substrate.
- the method of forming fine through holes in a ceramic green sheet using a mold or the like is more productive than the method of forming through holes in a substrate made of silicon or the like by etching. That is, productivity can be improved by using ceramic.
- the thinner the ceramic green sheet the easier it is to form fine through holes.
- a fine first through hole 101 can be easily formed.
- the ceramic green sheet constituting the second layer 11 can have a thickness and a number of layers according to the strength required for the substrate 1. That is, one or more insulating layers having the same configuration as the second layer 11 may be overlapped on the second layer 11. Since the substrate 1 is a laminated body in which the first layer 10 having the fine first through hole 101 and the other second layer 102 are laminated, the substrate 1 has the fine through holes and the required substrate thickness is secured. It becomes easy to do.
- the fine first through hole 101 in the substrate 1 By having the fine first through hole 101 in the substrate 1, it is possible to realize a substrate through which gas can pass but water cannot easily pass through. Since the diameter D1 of the first through hole 101 is 10 ⁇ m or more and 50 ⁇ m or less, it is possible to realize a structure in which water does not easily pass through. Since the diameter D1 of the first through hole 101 is 10 ⁇ m or more, good air permeability can be realized. The first through hole 101 having a diameter D1 of 10 ⁇ m or more can be easily formed by using ceramic as the material of the substrate 1.
- the IPX7 level or more is waterproof and the air permeability is excellent.
- the substrate 1 has a laminated structure of ceramic insulating layers, it is possible to secure sufficient strength for protecting the elements and the like housed therein. Further, by using ceramic as the material of the substrate 1, it is possible to reduce corrosion and deterioration with respect to water or gas as compared with the case of using a metal or organic material. Further, by using ceramic as the material of the substrate 1, the substrate 1 can have higher strength than the case where silicon is used. Therefore, the substrate 1 can be made thinner. Further, since it has high strength, the number of through holes can be increased and the air permeability can be improved.
- FIG. 2 is a cross-sectional view of another exemplary substrate 1A according to the first embodiment.
- the substrate 1A when the substrate 1A is viewed in a plan view from the side of the second surface 112A, one first through hole 101 overlaps with one second through hole 111A. It is different from the above-mentioned substrate 1 in that it is present.
- the same reference numerals are added to the members having the same functions as the members described in the above embodiment, and the description thereof will not be repeated. The same applies to other modifications and embodiments.
- the substrate 1A shown in FIG. 2 has a configuration in which a first layer 10A having a plurality of first through holes 101A and a second layer 11A having a plurality of second through holes 111A are laminated. is doing.
- the first layer 10A has a first surface 102A constituting one outer surface of the substrate 1A, and a first surface 103A on the side facing the second layer 11A.
- the second layer 11A has a second surface 112A constituting the other outer surface of the substrate 1A, and a second surface 113A on the side facing the first layer 10A.
- the first layer 10A and the second layer 11A are insulating layers made of an insulating material containing a ceramic material as in the case of the first layer 10 and the second layer 11 of the substrate 1 described above, respectively.
- the thicknesses of the first layer 10A and the second layer 11A and the diameter D1 of the first through hole 101A are the same as those of the above-mentioned substrate 1.
- the second through hole 111A is, for example, circular, and its diameter D2 is 100 ⁇ m or more and 200 ⁇ m or less.
- the second layer 11A By arranging the second layer 11A so as to be on the outside of the package, it is possible to have a second through hole 111A slightly larger than the first through hole 101A on the outside of the fine first through hole 101A. Thereby, the waterproof property of the substrate 1A can be further improved.
- the first through hole 101 (About the first through hole)
- the first through hole 101 will be described in detail below with reference to FIGS. 3 to 10. It should be noted that the following description of the first through hole 101 can refer to the same content for the first through hole 101A described above and all the first through holes described below.
- the sensor device configured using the substrate 1 has a through hole through which a gas passes in order to ensure air permeability to the sensor element mounted inside. Further, the electronic device equipped with the sensor element is required to have a level of waterproofness equivalent to, for example, IPX7. Therefore, it is desired that the first through hole 101 of the substrate 1 has a configuration capable of achieving good air permeability and waterproof performance equivalent to IPX7. Under such circumstances, the present inventors have earnestly studied a substrate having a waterproof structure while ensuring good air permeability, and realized the substrate of the present disclosure.
- FIG. 3 is an exemplary SEM photograph showing a cross section when the first through hole 101 formed in the first layer 10 is cut in a plane (XX plane) perpendicular to the surface of the first layer 10. be.
- the first through hole 101 may be substantially perpendicular to the first layer 10.
- the first through hole 101 has a linear tube shape in which the diameters of the first opening 121 on the 1-1 surface 102 side and the second opening 122 on the 1-2 surface 103 side are substantially the same. More specifically, in the cross section shown in FIG. 3, the smaller of the angles between the line segment formed by the inner wall surface of the first through hole 101 and the line segment formed by the surface of the first layer 10 ( ⁇ 1 ). May be 80 ° or more and 90 ° or less.
- the thickness T of the first layer 10 is about 100 ⁇ m, and the diameter D of the first through hole 101 on the 1-1 surface 102 side is about 26 ⁇ m.
- FIG. 4 is a schematic cross-sectional view of the first layer 10 and shows another aspect of the first through hole 101.
- FIG. 5 shows a plan view when the substrate 1 is viewed from the 2-1 plane 102 side, and an enlarged cross-sectional view of the substrate 1 in a plane parallel to the XX plane.
- the plan view shows an example of the arrangement of the first through hole 101 with respect to the second through hole 111.
- FIG. 6 shows a comparative example with respect to FIG.
- the first through hole 101 may have a mode in which the size of the first opening 121 and the size of the second opening 122 are different.
- the first through hole 101B shows an example in which the first opening 121B is smaller than the second opening 122B.
- the first through hole 101C shows an example in which the first opening 121C is larger than the second opening 122C.
- the side of the first opening 121 is the side where water may infiltrate.
- the diameter of the first opening 121 is larger than the diameter of the second opening 122 as in the first through hole 101C
- the inside of the first through hole 101C is from the side of the 1-1 surface 102 to the inside of the first through hole 101C.
- water will be relatively easy to infiltrate.
- the diameter of the second opening 122 is larger than the diameter of the first opening 121 as in the first through hole 101B, it penetrates into the inside of the first through hole 101B from the side of the 1-1 surface 102. It is conceivable that the drained water will easily flow out to the first and second surfaces 103. Then, it is considered that the larger the difference in diameter between the first opening 121 and the second opening 122, the higher the possibility as described above.
- the angle ( ⁇ 1 ) of the first through hole 101 is the smaller of the angle between the line segment formed by the inner wall surface of the first through hole 101 and the line segment formed by the surface of the first layer 10. , 80 ° or more and 90 ° or less. Further, it may have a linear tube shape in which the diameters of the first opening 121 and the second opening 122 are substantially the same. Further, the thickness T of the first layer 10 (that is, the distance between the first opening 121 and the second opening 122 of the first through hole 101) is larger than twice the diameter D of the first opening 121. May be good. With this configuration, the waterproof property of the substrate 1 can be further improved. Further, since the first through hole 101 has a linear tube shape, the pitch between the holes can be further narrowed. As a result, the number of first through holes 101 formed in the substrate 1 can be increased, and the air permeability can be improved.
- the through hole 101 in the method of forming a hole in a substrate made of silicon by etching, the through hole is tapered, so that the diameters of the first opening 121 and the second opening 122 are almost the same straight line. It is difficult to realize a typical tube shape.
- the substrate 1 is a ceramic insulating layer, the first through hole 101 having a linear tube shape can be easily formed by a method of drilling a ceramic green sheet using a mold or the like. can.
- the larger diameter can be 100 ⁇ m or less in order to obtain the desired waterproof performance.
- the larger opening can be the side on which water can enter. That is, as in the first through hole 101C in FIG. 4, the first opening 121 may have a tapered shape larger than the second opening 122. If the size is 100 ⁇ m or less, the first opening 121 also has a certain degree of waterproofness. Further, due to the resistance of the air in the first through hole 101, it is difficult for the infiltrated water to reach the second opening 122.
- the infiltrated water reaches the second opening 122 when a certain amount of water pressure is applied, but since the second opening 122 has a sufficiently small diameter, there is a possibility that the infiltrated water exceeds the second opening 122. Can be reduced. Therefore, when the sizes of the two openings of the first through hole 101 are different, the one in which the first opening 121 is larger than the second opening 122 is superior in waterproofness.
- the first through hole 101 is separated from the inner side surface of the second through hole 111 when the substrate 1 is viewed in a plan view from the 2-1 surface 112 side of the second layer 11. It may be formed. With this configuration, it is possible to secure a portion of the first surface 102 where water spreads around the first through hole 101, so that it becomes difficult for water to enter the first through hole 101 due to surface tension. In the comparative example shown in FIG. 6, since the through hole is not separated from the inner surface of the second through hole 111, water easily enters the inside of the through hole along the inner surface of the second through hole 111. By forming the first through hole 101 at a distance from the inner side surface of the second through hole 111, the possibility of water entering the first through hole 101 can be further reduced.
- a coating layer having a water-repellent function may be provided on the first surface 102 or the first surface 103 or both sides of the first layer.
- the coating layer having a water-repellent function can be formed, for example, by immersing the substrate 1 in a treatment liquid containing fluorine and drying it. Further, the treatment liquid may be infiltrated into the first through hole 101 by pressurizing or reducing the pressure when immersed in the treatment liquid, and a coating layer may be formed on the inner wall of the first through hole 101. Since the presence of the coating layer makes it difficult for water to enter the first through hole 101, the hole diameter of the first through hole 101 can be increased as compared with the case where the coating layer is not provided. Thereby, the air permeability can be improved.
- FIG. 7 is a schematic cross-sectional view of the first layer 10 and a plan view of the first through hole 101 when viewed from the 1-1 surface 102 side of the first layer 10, and is another aspect of the first through hole 101. Is shown.
- FIG. 8 is a schematic cross-sectional view of the first layer 10 and shows another aspect of the first through hole 101.
- 9 and 10 are schematic plan views showing an example of arrangement of the first through hole 101 when the substrate 1 is viewed in a plan view from the 2-1 plane 112 side of the second layer 11.
- the first through hole 101 is, like the first through hole 101D, the first through hole 101E, and the first through hole 101F shown in FIG. 7, the first through hole 102 or the first to second surface 103 of the first layer 10. It may be an aspect inclined with respect to the relative.
- the length of the overlapping region SD where the first opening 121 and the second opening 122 overlap in a plan view is about 0. It is 85D.
- the diameter of the second opening 122 of the first through hole 101E is D
- the length of the overlapping region SE in the X-axis direction is about 0.66D.
- the diameter of the second opening 122 of the first through hole 101F is D
- the length of the overlapping region SF in the X-axis direction is about 0.47D.
- the overlapping region S (FIG. 7) in which the first opening 121 and the second opening 122 of the through hole overlap when the substrate 1 is viewed in a plan view.
- the virtual center line L may be 90 ° ⁇ 10 ° or less with respect to the 1-1 surface 102 or the 1-2 surface 103 of the first layer 10. , 90 ° ⁇ 5 ° or less.
- the first through hole 101 may have an embodiment such as the first through hole 101G, the first through hole 101H and the first through hole 101I shown in FIG.
- the hole diameters of the first opening 121G and the second opening 122G are different, and the virtual center line L is the 1-1 surface 102 or the 1-2 surface 103 of the first layer 10. This is an example of being inclined with respect to.
- the first through hole 101H is an example in which the inner wall surface 123H of the first through hole 101H is a curved surface.
- the first through hole 101I is an example in which the inner wall surface 123I of the first through hole 101I is a bent surface.
- the inner wall surface 123 of the through hole may have a loose curve or a loose bend. Further, as in the first through hole 101B and the first through hole 101C shown in FIG. 4, the size of the first opening 121 and the size of the second opening 122 may be different from each other.
- the air permeability is lowered. Further, it is considered that the air permeability is also lowered when the degree of bending of the inner wall surface 123H of the first through hole 101H and the bending of the inner wall surface 123I of the first through hole 101I shown in FIG. 8 is large.
- the hole diameter of the first opening 121 and the hole diameter of the second opening 122 are about the same size, and the first layer 10 has the same size.
- it may have a straight cylindrical shape extending in a substantially vertical direction.
- the arrangement of the first through hole 101 in the first layer 10 is not particularly limited. Any arrangement can be selected according to the type and characteristics of the mounted sensor element.
- Reference numeral 9001 in FIG. 9 shows an example in which the first through holes 101 have a staggered arrangement when the substrate 1 is viewed in a plan view from the 2-1 plane 112 side of the second layer 11.
- Reference numeral 9002 in FIG. 9 shows an example in which the first through hole 101 has a lattice arrangement.
- the distance between the first through holes 101 has the same inter-hole distance DP for both the staggered arrangement of reference numeral 9001 and the lattice arrangement of reference numeral 9002.
- the number of first through holes 101 included in the holes of the second through hole 111 is larger in the staggered arrangement of reference numeral 9001. That is, in the staggered arrangement, more first through holes 101 having the same diameter can be arranged in a region having the same area as compared with a grid arrangement having the same inter-hole distance DP.
- the ratio of the total area of the holes of the first through hole 101 to the area of the holes of the second through hole 111 is high. That is, it is preferable that the number of the first through holes 101 included in the holes of the second through holes 111 is large. Since the distance DP between the first through holes 101 is the same, it is considered that the influence on the strength of the substrate 1 is small even when the number of the first through holes 101 is increased by adopting the staggered arrangement. From the above, in consideration of air permeability, the arrangement of the first through holes 101 may be a staggered arrangement. By arranging the plurality of first through holes 101 in a staggered arrangement, the air permeability of the substrate 1 can be improved.
- FIG. 10 shows an example in which the first layer 10 does not have the first through hole 101 in the central portion.
- FIG. 11 is used for a waterproof test in which whether or not water is flooded when a water pressure of 1 m in depth is applied for 30 minutes is investigated by changing the diameter D1 of the first through hole 101 and the thickness Ts of the through hole in various ways. I will explain.
- FIG. 11 is a diagram showing an outline of the device used for the waterproof test. If the evaluation sample 510 is 1 m from the upper surface to the water surface and is not flooded when the evaluation sample 510 is submerged for 30 minutes, it can be determined that the evaluation sample 510 has IPX7 level waterproof performance.
- FIG. 11 is a schematic view showing the device used for the waterproof test.
- Reference numeral 1101 in FIG. 11 indicates an overall view of the device used in the waterproof test.
- the evaluation sample 510 is installed at the bottom of the device connected to the sample bottle 501 and the circular tube 502, and the inside of the container is filled with water so that the height from the upper surface of the evaluation sample 510 to the water surface is 1 m. , A waterproof test was carried out for 30 minutes.
- the evaluation sample 510 is configured by joining the sample substrate (upper layer 503A and lower layer 503B) and the cavity substrate 504 with a resin adhesive 506.
- the sample substrate is composed of two layers, and a first through hole 101 is formed in the upper layer 503A which is in contact with water.
- the thickness of the upper layer 503A is the thickness Ts of the through hole.
- a second through hole 111 having a larger hole diameter than the first through hole 101 is formed at a position corresponding to the first through hole 101.
- Reference numeral 1105 is a top view of the cavity substrate 504, and reference numeral 1106 is a sectional view taken along line BB of reference numeral 1105.
- Reference numeral 1107 shows a cross-sectional view of the evaluation sample 510.
- the upper layer 503A, lower layer 503B, and cavity substrate 504 of the evaluation sample 510 were each manufactured using an uncoated alumina-like sintered body. Further, the surface roughness Ra of the upper layer 503A, the lower layer 503B and the cavity substrate 504 was less than 2.0 ⁇ m. The wetting angle of water on the surfaces of the upper layer 503A, the lower layer 503B and the cavity substrate 504 was less than 90 °.
- the sample substrate was removed from the cavity substrate 504, and the presence or absence of water intrusion into the cavity 505 was confirmed using a microscope of ⁇ 10 times.
- Each example was evaluated using 20 evaluation samples. Further, as a comparative example, 10 similar evaluation samples were used for a through hole having a hole diameter of 0.051 mm and a through hole thickness of 0.1 mm.
- Table 1 is a correspondence table between the pore diameter and the through-hole thickness of the evaluated sample tested for each example.
- Table 2 is a table showing the results of the waterproof test of the evaluation samples and comparative examples shown in Table 1. Examples 1 to 9 in Table 2 correspond to any of the circles in Table 1, respectively.
- FIG. 12 is a cross-sectional view of the evaluation sample 520 used in the waterproof test 2.
- the evaluation sample 520 used in the waterproof test 2 is different from the evaluation sample 510 used in the waterproof test 1 in that it does not have the lower layer 503B. Other configurations are the same as those of the evaluation sample 510.
- the total volume of the first through hole 101 of the evaluation sample 520 is V', and the space volume defined by the lower surface of the upper layer 503A and the inner surface of the cavity substrate 504 is V.
- an evaluation sample 520 having an upper layer 503A having a size of 2.8 mm ⁇ 2.8 mm in a plan view was prepared on a cavity substrate 504 having a size of 3.0 mm ⁇ 3.0 mm ⁇ 1.1 mm.
- sample B an evaluation sample 520 having an upper layer 503A having a size of 1.9 mm ⁇ 1.9 mm in a plan view was prepared on a cavity substrate 504 having a size of 2.05 mm ⁇ 2.05 mm ⁇ 0.9 mm.
- the thickness of the upper layer 503A is 0.1 mm.
- the upper layer 503A has 16 first through holes 101 having a hole diameter of 0.034 mm.
- the device shown by reference numeral 1101 in FIG. 11 was used. If the evaluation sample 520 is 1 m from the upper surface to the water surface and the evaluation sample 520 is submerged for 30 minutes without flooding, it can be determined that the evaluation sample 520 has IPX7 level waterproof performance. Similarly, if the evaluation sample 520 is 1.5 m from the upper surface to the water surface and is not flooded when the evaluation sample 520 is submerged for 30 minutes, it is judged to have IPX8 level waterproof performance. be able to.
- Table 3 is a table showing the results of the waterproof test 2 of Sample A and Sample B.
- the upper layer 503A was removed from the cavity substrate 504, and the presence or absence of water intrusion into the cavity was confirmed using a microscope of ⁇ 10 times. 20 evaluation samples were used for sample A, and 10 evaluation samples were used for sample B.
- V'/ V the higher the waterproof property.
- the condition of V'/ V> 0.1% may be satisfied.
- the gas sensor device 200 in which the gas sensor element 3G (sensor element) is mounted as an example of the sensor element 3 in the package 100 including the substrate 1 described in the first embodiment will be described.
- the gas sensor device 200 equipped with the gas sensor element 3G will be described, but the mounted sensor element is not limited to the gas sensor element 3G.
- the configuration of the gas sensor device 200 exemplified in the second embodiment can be applied as a sensor device in which a sensor element that requires air permeability is mounted in a package on which the sensor element is mounted.
- the sensor element is, for example, a gas sensor element that detects the properties of a gas, and more specifically, a gas sensor element, a barometric pressure sensor element, a humidity sensor element, or the like can be mentioned.
- FIG. 13 is a cross-sectional view of the substrate 1 of the gas sensor device 200.
- the gas sensor device 200 includes a package 100 and a gas sensor element 3G.
- the package 100 includes a substrate 1 (second substrate) and a wiring board 2 (first substrate) having a housing recess 21 for accommodating a sensor element and a wiring conductor 22.
- the substrate 1 is a lid of the package 100.
- the gas sensor device 200 (package 100) may have a rectangular shape such as a rectangular shape or a square shape in a plan view.
- the substrate 1 is as described in the first embodiment.
- the first surface 102 forms a part of the outer surface of the package 100, and the second surface 112 is arranged so as to face the gas sensor element 3G. ing.
- the wiring board 2 is a board on which the gas sensor element 3G is mounted.
- the wiring board 2 has functions such as ensuring mechanical strength as a board on which the gas sensor element 3G is mounted and ensuring insulation between a plurality of wiring conductors 22.
- the size of the accommodating recess 21 of the wiring board 2 may be any shape and any size as long as it can accommodate the gas sensor element 3G. Further, the shape of the inner surface of the accommodating recess 21 is not particularly limited. As shown in FIG. 13, the inner surface of the accommodating recess 21 may have a staircase shape. Further, it may be an inclined surface having an inclination with respect to the bottom surface of the wiring board 2.
- the wiring board 2 has wiring conductors 22 inside and on the surface.
- the wiring board 2 may be a laminated body in which a plurality of insulating layers made of, for example, an aluminum oxide sintered body are laminated.
- a wiring conductor 22 is provided on the surface and inside of the wiring board 2.
- the wiring board 2 includes a connection pad 22A for connecting to the gas sensor element 3G and a terminal electrode 22D for connecting to an external electric circuit as the wiring conductor 22.
- the connection pad 22A and the terminal electrode 22D are electrically connected by a through conductor 22B (not shown) and an internal wiring layer 22C (not shown) provided inside the wiring board 2.
- the penetrating conductor 22B penetrates the insulating layer, and the internal wiring layer 22C is arranged between the insulating layers.
- the terminal electrode 22D may be provided not only on the lower surface of the wiring board 2 but also from the lower surface to the side surface or on the side surface.
- the wiring conductor 22 mainly contains, for example, a metal such as tungsten, molybdenum, manganese, copper, silver, palladium, gold, platinum, nickel or cobalt, or an alloy containing these metals as a conductor material.
- the connection pad 22A and the terminal electrode 22D are formed on the surface of the wiring board 2 as a metal layer such as a metallized layer or a plating layer of a conductor material.
- the metal layer may be one layer or a plurality of layers.
- the through conductor 22B and the internal wiring layer 22C are formed inside the wiring board 2 by metallizing the conductor material.
- connection pad 22A, the internal wiring layer 22C, and the terminal electrode 22D of the wiring conductor 22 are formed as follows, for example, in the case of a tungsten metallized layer. That is, a metal paste prepared by mixing tungsten powder with an organic solvent and an organic binder is printed at a predetermined position on a ceramic green sheet to be a wiring substrate 2 by a method such as a screen printing method and fired. can do. Further, among these, a plating layer such as nickel or gold may be further adhered to the exposed surface of the metallized layer to be the connection pad 22A and the terminal electrode 22D by using an electrolytic plating method, an electroless plating method, or the like. .. Further, the through conductor 22B may be formed by providing a through hole at a predetermined position on the ceramic green sheet prior to printing the metal paste, filling the through hole with the metal paste, and firing.
- the substrate 1 and the wiring board 2 can be joined via the sealing joining material 7.
- the sealing joint material 7 include a resin adhesive, glass, a brazing material containing solder, and the like.
- the metal layer 6 for joining may be provided on the upper surface of the wiring board 2 and the portion of the substrate 1 facing the upper surface of the wiring board 2.
- the metal layer 6 for joining may be formed of, for example, a metal film such as a plating film or a metallized layer.
- the substrate-type semiconductor gas sensor is obtained by forming a semiconductor material to be a gas-sensitive portion 31G on the surface of a support substrate 32G in the form of a thin film or a thick film and then firing.
- a platinum comb-shaped electrode (not shown) is provided on the surface of the support substrate 32G, and the sensor output is taken out using the platinum wire wired between the electrodes as a signal line.
- the gas-sensitive portion 31G is heated by a platinum heater (not shown) on the back side of the support substrate 32G.
- the gas sensor element 3G may be a MEMS type semiconductor gas sensor in which a MEMS substrate having a diaphragm structure incorporating a heater is used as a support substrate.
- the lower surface of the gas sensor element 3G is joined and fixed to the bottom surface of the accommodating recess 21 of the wiring board 2 by the bonding material 33.
- An electrode (not shown) arranged on the upper surface of the gas sensor element 3G and the wiring board 2 are electrically connected to each other by a connecting member 5.
- the gas sensing unit 31G generally detects the gas in a state of being heated to about 200 to 500 ° C. by a heater, although there is a difference depending on the gas to be detected. Therefore, the material of the package accommodating the gas sensor element 3G should be a material having a low possibility of gas generation or corrosion even when exposed to a high temperature. Ceramics are less prone to corrosion due to various gases or moisture. Moreover, even when exposed to high temperatures, very little gas is emitted from the ceramic itself. From this point of view, ceramic is a very good material for the package or substrate of the gas sensor device 200.
- the terminal electrode 22D and the external electric circuit are electrically connected, so that the gas sensor element 3G mounted on the wiring board 2 (package 100) and the external electric circuit are electrically connected. .. That is, the gas sensor element 3G and the external electric circuit are electrically connected via a connecting member 5 such as a bonding wire and a wiring conductor 22.
- the external electric circuit is an electric circuit included in a mounting board (circuit board) mounted on an electronic device such as a smartphone.
- the package 100 includes a wiring board 2 having a housing recess 21 for accommodating the gas sensor element 3G, and a substrate 1 for closing the housing recess 21.
- the substrate 1 includes a first layer 10 which is a ceramic insulating layer having a plurality of first through holes 101, and a second layer 11 which is a ceramic insulating layer having at least one second through hole 111.
- the diameter of the first through hole 101 is 10 to 50 ⁇ m, and the diameter of the second through hole 111 is larger than the diameter of the first through hole 101.
- At least a part of the plurality of first through holes 101 is located at a position overlapping the second through holes 111 in the plan view of the first layer 10, and the second layer 11 is on the accommodation recess 21 side.
- the gas that has passed through the first through hole 101 further passes through the second through hole 111, and easily advances toward the gas sensitive portion 31G of the gas sensor element 3G. Therefore, the sensor sensitivity can be improved.
- the diameter of the second through hole 111 (or the length of one side in the case of a rectangle) is 1 ⁇ 2 or more of the diameter (or the length of one side) of the gas sensor element 3G, and the diameter (or one side). It may be twice or less of the length).
- the second through hole 111 has a circular shape having a diameter of 0.5 mm or more and 2 mm or less, or a square shape having a side of 0.5 mm or more and 2 mm or less. May be.
- the convex portion (gas sensing portion 31G) of the gas sensor element 3G can be accommodated in the concave portion of the substrate 1 formed by the second through hole 111, so that the thickness can be further reduced.
- the top of the loop of the connecting member 5 (bonding wire) can be accommodated in the recess formed by the second through hole 111. Even in such a case, the package 100 and the gas sensor device 200 can be made thinner. Further, the gas sensitive portion 31G can be arranged at a position close to the outer surface of the package 100.
- the air heated and raised by the gas-sensitive portion 31G tends to collect in the second through hole (recessed portion of the substrate), the discharge of the heated air is promoted. Along with this, more air can be taken in from the outside of the package. This improves the gas sensing sensitivity.
- FIG. 14 is a cross-sectional view of another exemplary gas sensor device 200A according to the second embodiment.
- the gas sensor device 200A includes a package 100A and a gas sensor element 3G.
- Package 100A includes a substrate 1 according to the first embodiment and a wiring board 2 according to the second embodiment.
- the orientation of the substrate 1 of the package 100A is different from that of the package 100 of the second embodiment described above.
- the 2-1 surface 112 constitutes a part of the outer surface of the package 100A
- the 1-1 surface 102 is a gas sensor. It faces the element 3G. That is, the first layer 10 may be on the accommodating recess 21 side as in the modified example 2-1. Other than that, it is the same as the gas sensor device 200 of FIG.
- the possibility that the surface of the first layer 10 receives mechanical contact from the outside is reduced in the device transporting or assembling process. As a result, it is possible to reduce the possibility that the thin plate portion of the substrate 1 on which the first through hole 101 is formed is damaged by mechanical contact from the outside.
- FIG. 15 is a cross-sectional view of another exemplary gas sensor device 200B according to the second embodiment.
- the gas sensor device 200B includes a package 100B and a gas sensor element 3G.
- Package 100B includes a substrate 1A according to a modification 1-1 of the first embodiment and a wiring board 2 according to the second embodiment.
- the second through hole 111A is slightly larger than the fine first through hole 101A.
- the size of the second through hole 111A is smaller than the example shown in the modified example 2-1. Therefore, the strength of the package can be improved. Further, since the example shown in the modified example 2-2 has excellent strength, it can be made thinner.
- FIG. 16 is a cross-sectional view of another exemplary gas sensor device 200C according to the second embodiment.
- the gas sensor device 200C includes a package 100C and a gas sensor element 3G.
- the orientation of the substrate 1A of the package 100C is different from that of the package 100B of the above-mentioned modification 2-2.
- the 2-1 surface 112A constitutes a part of the outer surface of the package 100A
- the 1-1 surface 102A is a gas sensor. It faces the element 3G.
- the first surface 112A constitutes a part of the outer surface of the package 100C
- the first surface 102A constitutes a part of the inner surface of the package 100C.
- a second through hole 111A having a diameter of 100 ⁇ m or more and 200 ⁇ m or less on the outside of the first through hole 101A having a diameter of 10 ⁇ m or more and 50 ⁇ m or less and having an excellent waterproof effect a stepwise waterproof structure is obtained and waterproof. The effect can be further improved.
- the waterproofing by the fine first through hole 101 is mainly due to the surface tension of water. If the second through hole 111A is also fine as described above, it also has waterproof property due to surface tension.
- the second through hole 111A and the first through hole 101A have a two-stage waterproof structure.
- the infiltration of water can be prevented by the second through hole 111A.
- the configuration of the modified example 2-3 also has the effect of reducing the possibility of breakage of the thin plate portion and improving the strength described in the modified example 2-1 and the modified example 2-2.
- FIG. 17 is a cross-sectional view of the package 100C.
- the space volume V in the package is defined by the first surface 102A and the accommodating recess 21.
- the space inside the package does not communicate with the outside other than the first through hole 101A and the second through hole 111A of the substrate 1A, the water to enter from the outside is the space inside the package from the second through hole 111A. The air must be pushed in.
- the diameter of the second through hole 111A is also fine, water from the outside covers the opening of the second through hole 111A, so that the air in the second through hole 111A is pushed in. Further, in order to penetrate into the space inside the package through the first through hole 101A, the air in the first through hole 101A must also be pushed in.
- the first through hole 101A and the second through hole 111A communicate with the space inside the package, and the space inside the package does not communicate with the outside except for the first through hole 101A and the second through hole 111A. Therefore, the water that enters from the outside enters while compressing the air in the second through hole 111A, the first through hole 101A, and the space in the package.
- the waterproofing by the substrate 1A is performed by the repulsive force against the compression of the air in the infiltration path in addition to the surface tension of the water.
- the volume of air that water must compress is the sum of the volumes of the second through hole 111A and the first through hole 101A V'. If this volume V'is large, it becomes difficult for water to infiltrate. If the volume V'of air that must be compressed is large to some extent with respect to the total volume from the second through hole 111A to the space inside the package, it becomes difficult for water to penetrate into the space inside the package.
- the ratio of the total volume V'of the volumes of the second through hole 111A and the first through hole 101A to the volume V of the space in the package is larger than 0.05%. That is, by satisfying the condition of V'/ V ⁇ 0.05%, the possibility of water infiltrating from the outside of the package 100C can be significantly reduced.
- FIG. 18 is a cross-sectional view of the gas sensor device 200C.
- the space volume V in the package conducting with the first through hole 101A is as shown in FIG. , Defined by the accommodating recess 21 and the outer surface of the gas sensor element 3G. Since the space volume V in the package is reduced by the volume of the gas sensor element 3G, the ratio of the total volume V'of the volumes of the second through hole 111A and the first through hole 101A to the volume V of the space in the package is as described above. It will be even larger than 0.05%.
- this ratio is larger than 0.3%. That is, in the gas sensor device 200C as shown in FIG. 18, the possibility that water infiltrates from the outside of the gas sensor device 200C can be significantly reduced by satisfying the condition of V'/ V> 0.3%.
- FIG. 19 will be used to describe an additional configuration that reduces the possibility that the infiltrated water reaches the gas sensor element 3G when the infiltrated water has infiltrated from the first through hole 101. ..
- FIG. 19 shows a cross-sectional view of the gas sensor devices 200D, 200E, 200F, and 200G.
- the gas sensor device 200D shown by reference numeral 1901 in FIG. 19 is located on the outer edge portion of the gas sensor device 200 (FIG. 13) according to the second embodiment at a position separated from the outer edge portion of the second through hole 111. It has a frame-shaped protrusion 8 along the line.
- the frame-shaped protrusion 8 may be a metallized layer or a ceramic layer.
- the frame-shaped protrusion 8 can be formed by applying a metal paste or a ceramic paste containing the same ceramic material as the ceramic of the substrate to a ceramic green sheet. As shown in the figure of reference numeral 1901 of FIG.
- a step may be formed in the water intrusion path by providing the frame-shaped protrusion 8. As a result, it is possible to reduce the possibility that the water that has entered through the inner walls of the first through hole 101 and the second through hole 111 travels toward the gas sensor element 3G.
- the second layer 11' is further laminated on the second layer 11 side with respect to the substrate 1 of the gas sensor device 200 (FIG. 13) according to the second embodiment. It is different from the gas sensor device 200.
- the second through hole 111'of the second layer 11' has a size one size smaller than that of the second through hole 111 of the second layer 11.
- the second through hole 111'(inner wall) of the second layer 11' is located inside the (inner wall) of the second through hole 111 of the second layer 11.
- the second layer is composed of a second layer 11'which constitutes the outer surface of the substrate 1 and a second layer 11 between the second layer 11' and the first layer 10.
- the second through hole is composed of the second through hole 111'of the second layer 11'and the second through hole 111 of the second layer 11 which is one size larger than this, and the dimensions are different in the thickness direction. It can also be said that it is a through hole.
- a step may be formed in the water infiltration path by laminating the second layer 11 and the second layer 11'. As a result, it is possible to reduce the possibility that the water that has entered through the inner wall of the first through hole 101 travels toward the gas sensor element 3G.
- a frame-shaped protrusion surrounding the second through hole 111' may be provided on the surface of the second layer 11'on the first layer 10 side.
- This frame-shaped protrusion can be provided by using the same method as the frame-shaped protrusion 8 of the gas sensor device 200D. Alternatively, this frame-shaped protrusion is used when forming a through hole to be the second through hole 111'in the green sheet to be the second layer 11', or when laminating the green sheet having the through hole formed. It can also be provided by deforming the periphery in the direction in which the first through hole 101 is located.
- the gas sensor device 200F shown by reference numeral 1903 in FIG. 19 has a different shape of the sealing joint material 7 from the gas sensor device 200 (FIG. 13) according to the second embodiment. That is, the inner circumferences of the metal layer 6 for joining and the sealing joining material 7 are located outside the outer edge of the accommodating recess. Therefore, a step is formed between the metal layer 6 for joining, the sealing joining material 7, and the wiring board 2. As shown in the figure of reference numeral 1903 of FIG. 19, a step may be formed in the water infiltration path by the sealing joining material 7 and the joining metal layer 6. As a result, it is possible to reduce the possibility that the water that has entered through the inner walls of the first through hole 101 and the second through hole 111 travels toward the gas sensor element 3G.
- the wiring board 2A of the gas sensor device 200G shown by reference numeral 1904 of FIG. 19 is further provided with a step on the inner wall surface of the wiring board 2 with respect to the wiring board 2 of the gas sensor device 200 (FIG. 13) according to the second embodiment. It differs from the gas sensor device 200 in that it is different from the gas sensor device 200. As shown in the figure of reference numeral 1904 of FIG. 19, by forming a step on the inner wall surface of the wiring board 2A, water that has entered through the inner walls of the first through hole 101 and the second through hole 111 is allowed to enter the gas sensor element 3G. It is possible to reduce the possibility of progressing toward.
- Modification 2-5 describes an example in which a plurality of sensor elements are mounted in a package, and a sensor device in which an IC chip such as an ASIC (Application Specific Integrated Circuit) and / or a capacitor is mounted.
- IC chip such as an ASIC (Application Specific Integrated Circuit) and / or a capacitor
- FIG. 20 is a cross-sectional view of the sensor device 200H.
- the sensor device 200H includes a package 100D, a gas sensor element 3G, and a barometric pressure sensor element 3H.
- Package 100D includes a substrate 1B and a wiring board 2B having a housing recess 21 and a wiring conductor 22.
- the second layer 11B of the substrate 1B has, for example, a second through hole 111 at a position corresponding to the gas sensor element 3G and the barometric pressure sensor element 3H.
- the first layer 10B has a plurality of first through holes 101 inside each second through hole 111 when the substrate 1B is viewed in a plan view from the 2-1 surface 112B side.
- the first surface 102B constitutes a part of the outer surface of the package 100D
- the second surface 112B faces the gas sensor element 3G and the barometric pressure sensor element 3H.
- a plurality of sensor elements 3 may be provided in one accommodating recess as in the wiring board 2B. Further, a partition wall may be provided between the plurality of sensor elements (see the example shown in FIG. 21).
- FIG. 20 an example including the gas sensor element 3G and the barometric pressure sensor element 3H has been described, but the type of the sensor element and the number of the sensor elements to be mounted are not limited thereto. Further, the positions and numbers of the first through hole 101 and the second through hole 111 can be appropriately changed depending on the mounted sensor element. That is, instead of the substrate 1B, a substrate having the above-mentioned configurations of the substrate 1 and the substrate 1A may be used.
- FIG. 21 is a cross-sectional view of the sensor device 200I.
- the sensor device 200I includes a package 100E, a gas sensor element 3G, an ASIC4A, and a capacitor 4B.
- Package 100E includes a substrate 1C and a wiring board 2C having a wiring conductor 22.
- the wiring board 2C has a first accommodating recess 21A for accommodating the sensor element and a second accommodating recess for accommodating the ASIC 4A and the capacitor 4B by having a partition wall 23 between the gas sensor element 3G, the ASIC 4A, and the capacitor 4B. It has 21B and.
- the second layer 11C of the substrate 1C has, for example, a second through hole 111 at a position corresponding to the gas sensor element 3G. Since the ASIC 4A and the capacitor 4B are desired to have an environment in which a fluid such as gas or liquid does not flow in, the ASIC 4A and the capacitor 4B are hermetically sealed by the substrate 1C, the wiring substrate 2C, and the partition wall 23.
- the first layer 10C has a plurality of first through holes 101 inside the second through holes 111 when the substrate 1C is viewed in a plan view from the 2-1 surface 112C side. In the substrate 1C, the first surface 102C constitutes a part of the outer surface of the package 100E, and the second surface 112C faces the gas sensor element 3G.
- FIG. 21 is merely an example, and the types and numbers of mounted sensor elements and other components are not limited thereto. Further, the positions and numbers of the first through hole 101 and the second through hole 111 can be appropriately changed depending on the mounted sensor element. That is, instead of the substrate 1C, a substrate having the above-mentioned configurations of the substrate 1, the substrate 1A, and the substrate 1B may be used.
- FIG. 22 is a sectional view of an exemplary substrate 1D according to the third embodiment.
- Reference numeral 2301 in FIG. 23 is a perspective view of the substrate 1D viewed from the side of the 1-1 surface 102
- reference numeral 2302 is a perspective view of the substrate 1D viewed from the side of the frame portion 12.
- the substrate 1D surrounds the first through hole 101 and the second through hole 111 on the surface of the first layer 10, the second layer 11, and the second layer, for example. It has a frame portion 12 to be located and a wiring conductor 22. That is, the substrate 1D has a function as a wiring board on which the sensor element is mounted.
- the frame portion 12 contains a ceramic material such as an aluminum oxide sintered body, a glass ceramic sintered body, a mullite sintered body, or an aluminum nitride material sintered body. It is an insulating layer.
- the substrate 1D has a housing recess 21D defined by the frame portion 12.
- the shape and size of the accommodating recess 21D may be any shape and any size, depending on the shape and size of the accommodating sensor element.
- the accommodating recess 21D may have a rectangular parallelepiped shape.
- the shape of the inner surface of the frame portion 12 is not particularly limited.
- the inner surface of the frame portion 12 may be a staircase shape or an inclined surface having an inclination with respect to the first layer 10 and the second layer 11.
- the frame portion 12 has a wiring conductor 22 inside and / or on the surface. That is, the substrate 1D has wiring conductors 22 inside and on the surface.
- the substrate 1D includes a connection pad 22A for connecting to a sensor element and a terminal electrode 22D for connecting to an external electric circuit as a wiring conductor 22.
- the connection pad 22A and the terminal electrode 22D are electrically connected by a through conductor 22B provided inside the frame portion 12 and an internal wiring layer 22C (not shown).
- the penetrating conductor 22B penetrates the frame portion 12.
- the terminal electrode 22D may be provided not only on the upper surface of the frame portion 12 but also from the upper surface to the outer surface or on the outer surface.
- the substrate 1D according to the third embodiment needs strength because the sensor element is pressed against the substrate 1D in the mounting process of mounting the sensor element on the substrate 1D. Since the substrate 1D is composed of a ceramic insulating layer, it has excellent strength. Therefore, the substrate 1D can be made smaller or thinner, which contributes to the miniaturization or thinning of the sensor device using the substrate 1D. Further, by laminating the frame portion 12 on the first layer 10 or the second layer 11, the substrate 1D as an integrated structure can be easily manufactured.
- the dimension of the second through hole 111 is one size smaller than the dimension of the mounted sensor element, and the size can be set so that the opening of the second through hole 111 can be closed by the sensor element.
- the opening area of the second through hole 111 can be 9% or more and 64% or less of the area in the plan view of the sensor element.
- FIG. 22 shows an example of the substrate 1D as a laminated body including the first layer 10, the second layer 11, and the frame portion 12, but the first layer 10A and a plurality of second through holes 111 are provided. It may be a laminated body including the second layer 11A having and the frame portion 12.
- the first surface 102 of the first layer 10 constitutes a part of the outer surface of the substrate 1D
- the second surface 112 of the second layer 11 constitutes the bottom surface of the accommodating recess 21D.
- An example is shown.
- the 2-1 surface 112 of the second layer 11 may form a part of the outer surface of the substrate 1D
- the 1-1 surface 102 may form the bottom surface of the accommodating recess 21D. This is the same even when the substrate 1D includes the first layer 10A, the second layer 11A, and the frame portion 12.
- FIG. 24 is a cross-sectional view of the gas sensor device 200J.
- FIG. 24 shows a cross section in a state where the gas sensor device 200J is mounted on the mounting board 50.
- the gas sensor device 200J equipped with the gas sensor element 3G will be described, but the mounted sensor element is not limited to the gas sensor element 3G.
- the configuration of the gas sensor device 200J exemplified in the fourth embodiment can be applied as a sensor device in which a sensor element that requires air permeability is mounted in a package on which the sensor element is mounted.
- the sensor element 3 is, for example, a sensor that detects the properties of a gas, and more specifically, a gas sensor element, a barometric pressure sensor, a humidity sensor, or the like can be mentioned. Further, the sensor element 3 may be a MEMS element, and in this case, a smaller sensor device can be used.
- the gas sensor device 200J includes a substrate 1D and a gas sensor element 3G.
- the substrate 1D includes a first layer 10 which is a ceramic insulating layer having a plurality of first through holes 101, a second layer 11 having at least one second through hole 111, a frame portion 12, and a wiring conductor 22. Have.
- the second layer 11 is laminated with respect to the first layer 10.
- the frame portion 12 is located on the surface of the second layer 11 so as to surround the first through hole 101 and the second through hole 111.
- the first through hole 101 is, for example, circular, and its diameter D1 is 10 ⁇ m or more and 50 ⁇ m or less.
- the second through hole 111 is, for example, circular, and its diameter D2 is larger than the diameter D1 of the first through hole 101.
- the substrate 1D is viewed in a plan view from the 1-1 plane 102 side of the first layer 10
- at least a part of the plurality of first through holes 101 is located at a position overlapping with the second through holes 111.
- a plurality of first through holes 101 overlap with one second through hole 111.
- the second through hole 111 may have a rectangular shape.
- the gas sensor element 3G is flip-chip connected to the substrate 1D. That is, the gas sensor element 3G is formed by joining an electrode (not shown) provided on the surface of the support substrate 32G and a connection pad 22A with a conductive bonding material 9 such as a gold bump and a solder bump. It is connected to the substrate 1D. Between the substrate 1D and the gas sensor element 3G, a sealing member 13 for reducing the volume of the space conducting with the first through hole 101 is provided. By providing the sealing member 13, the space of the sensing portion provided with the gas sensing portion 31G can be made independent from the other spaces of the accommodating recess 21D. The sensor sensitivity is improved by reducing the space including the sensing unit. Further, by making the space including the sensing unit spatially independent, the space volume V conducting with the first through hole 101 becomes small. As a result, the value of V'/ V is inevitably large, so that the waterproof performance is improved.
- the sealing member 13 may be an underfill material for reinforcing the bonding strength of the gas sensor element 3G to the substrate 1D by the conductive bonding material 9.
- the underfill material is arranged not only around the conductive bonding material 9 such as gold bumps and solder bumps but also over the entire circumference of the gas sensor element 3G (support substrate 32G), and a space between the gas sensor element 3G and the substrate 1D is provided. By filling the above, the sealing member 13 can be made to reduce the volume of the space conducting with the first through hole 101.
- the gas sensor element 3G is flip-chip connected to the substrate 1D, the height for accommodating the pad for the bonding wire and the bonding loop is not required, and as a result, the gas sensor device 200J is made smaller and thinner. Can be transformed into.
- the gas-sensitive portion 31G is located outside the second through hole 111, but even if the gas-sensitive portion 31G is housed in the second through hole 111 by adjusting the thickness of the conductive joining material 9. good. With this configuration, the gas sensor device 200J can be further miniaturized.
- the dimension of the second through hole 111 is 30% or more and 80% or less of the diameter (or length of one side) of the gas sensor element 3G. May be good.
- the second through hole 111 is a circle having a diameter of 0.3 mm or more and 0.8 mm or less, or a side of 0.3 mm or more and 0.8 mm or less. It may have a square shape.
- the convex portion (gas sensing portion 31G) of the gas sensor element 3G can be accommodated in the concave portion of the substrate 1 formed by the second through hole 111, so that the size can be further reduced.
- the gas sensitive portion 31G can be arranged at a position close to the outer surface of the package 100. Further, since the air heated and raised by the gas-sensitive portion 31G tends to collect in the second through hole 111 (recessed portion of the substrate), the discharge of the heated air is promoted. Along with this, more air can be taken in from the outside of the package. This improves the gas sensing sensitivity.
- FIG. 25 is a cross-sectional view of another exemplary barometric pressure sensor device 200K according to the fourth embodiment.
- the barometric pressure sensor device 200K includes a substrate 1D and a barometric pressure sensor element 3H.
- the barometric pressure sensor device 200K is different from the gas sensor device 200J of the fourth embodiment in that the mounted sensor element is the barometric pressure sensor element 3H and the mode of connection between the barometric pressure sensor element 3H and the substrate 1D.
- FIG. 25 shows a barometric pressure sensor device 200K equipped with a barometric pressure sensor element 3H as an example, but the sensor element mounted in the same manner is not limited to the barometric pressure sensor element 3H.
- a sensor element such as the barometric pressure sensor element 3H, which can be detected by ventilation from the lower surface side of the sensor element, it may be connected to the substrate 1D by a wire bonding connection as shown in FIG. 25.
- FIG. 26 is a cross-sectional view of the gas sensor device 200L.
- the gas sensor device 200L includes a substrate 1E and a gas sensor element 3G.
- the substrate 1E includes a second layer 11A, a first layer 10A, a second layer 11A having a plurality of second through holes 111A on the surface of the first layer 1A, and a first through hole 101 and a second through hole 111. It has a frame portion 12 located so as to surround the wiring conductor 22 and a wiring conductor 22.
- the substrate 1E has a housing recess 21E defined by the frame portion 12.
- the substrate 1E has a second through hole 111A having a diameter of 100 ⁇ m or more and 200 ⁇ m or less on the outside of the first through hole 101A having an excellent waterproof effect, thereby forming a stepwise waterproof structure and further improving the waterproof effect. Can be done.
- the gas sensor element 3G is flip-chip connected to the substrate 1E as in the gas sensor device 200J of FIG. 24. Further, between the substrate 1E and the gas sensor element 3G, a sealing member 13 for reducing the volume of the space conducting with the first through hole 101 is provided. By providing the sealing member 13, the space of the sensing portion can be made independent from the other space of the accommodating recess 21E.
- the space volume V in the package conducting with the first through hole 101A is defined by the first surface 102A, the sealing member 13, and the outer surface of the gas sensor element 3G.
- the relationship between the space volume V and the total volume V'of the first through hole 101A and the second through hole 111A satisfies the condition of V'/ V> 0.3%, so that the outside of the gas sensor device 200L The possibility of water intrusion can be significantly reduced.
- the gas sensor device 200L has a higher space volume V due to the flip chip connection of the gas sensor element 3G. It is getting smaller and V'/ V is getting bigger.
- the gas sensor device 200J and the barometric pressure sensor device 200K use a substrate 1D or a substrate 1E provided with a frame portion 12.
- electronic components other than the sensor element 3 gas sensor element 3G, pressure sensor element 3H
- the electronic component may be mounted on the same surface as the sensor element 3 by increasing the internal dimension of the frame portion 12.
- the electrical connection between the electronic component and the substrate may be made by wire bonding, flip-chip connection, solder or conductive adhesive.
- the thickness of the frame portion 12 may be increased and the frame portion 12 may be mounted on the sensor element 3. In this case, it can be connected to the substrate 1D or the substrate 1E by wire bonding.
- the size in the plane direction can be reduced and the sensor device can be made into a sensor device having a small mounting area.
- the internal space of the sensor element can be closed with an electronic component. Therefore, the sensor element and the electronic component can be resin-sealed.
- FIG. 27 is a cross-sectional view of the barometric pressure sensor device 200M described in the modified example 4-1.
- the space volume V in the package conducting with the first through hole 101A is defined as follows. That is, as shown in FIG. 27, the space volume V is the sum of the volume of the second through hole 111 and the internal space volume of the barometric pressure sensor element 3H.
- the relationship between the total volume V'of the first through hole 101A and the space volume V satisfies the condition of V'/ V> 0.3%, water infiltrates from the outside of the barometric pressure sensor device 200M. The possibility of doing so can be significantly reduced.
- the barometric pressure sensor device 200M has the same wire bonding connection as the gas sensor devices 200 and 200A to 200G shown in FIGS. 13 to 16 and 18 to 19, but is mounted so that the barometric pressure sensor element 3H closes the second through hole 111. Has been done. As a result, the space volume V becomes smaller and V'/ V becomes larger.
- V'/ V when the mounted sensor element is a MEMS element composed of a flat plate portion and a frame portion, the following can be said with reference to FIGS. 24 to 27. That is, as can be seen from FIGS. 26 and 27, the internal space of the sensor element surrounded by the frame portion and the flat plate portion is communicated with the through hole and mounted (FIG. 27). V'/ V is larger when mounted toward the opposite side (FIG. 26). Therefore, between 200J and 200K, 200J is more waterproof.
- the through hole has the first through hole 101 on the frame portion 12 side, and the second through hole on the opposite side of the frame portion 12 is one size larger than the first through hole.
- the gas sensor device 200L having the hole 111 has a larger V'/ V. Therefore, when the gas sensor device 200J of FIG. 24 and the gas sensor device 200L of FIG. 26 are compared, the gas sensor device 200L is more waterproof.
- the configurations of the first through hole 101 and the second through hole 102 described in the first embodiment can be appropriately applied to the above-described embodiments 2 to 4.
- FIGS. 28 to 33 An example of mounting on an electronic device described below is an example.
- the gas sensor device in one aspect of the present disclosure may be mounted on an electronic device in another known mounting mode.
- the gas sensor device mounted on the electronic device described below is an example, and it is needless to say that various changes may be made within the range shown in the present disclosure.
- Specific examples of the electronic device equipped with the gas sensor device in one aspect of the present disclosure include, but are not limited to, communication information terminals such as smartphones, watches, game machines, earphones, and the like.
- a barometric pressure sensor device having a barometric pressure sensor element, a humidity sensor device having a humidity sensor element, or the like may be mounted instead of the gas sensor device.
- FIG. 28 is a cross-sectional view of an electronic device 301 including a gas sensor device 200 (see FIG. 13).
- FIG. 28 shows the vicinity of the portion of the electronic device 301 on which the gas sensor device 200 is mounted.
- the range shown in the cross-sectional view of the electronic device is not described repeatedly, but the same applies to the following mounting examples.
- the electronic device 301 has a gas sensor device 200, a mounting board 50, and a housing 60 in which an opening 61 serving as a ventilation hole is formed.
- the gas sensor device 200 is mounted on the mounting board 50.
- the terminal electrode 22D of the gas sensor device 200 and the external electrode 54 of the mounting substrate 50 are bonded to each other by a conductive bonding material such as solder.
- the mounting board 50 is, for example, a printed circuit board (PCB) and has a wiring 53 and an external electrode 54.
- the electronic device 301 is arranged so that the position of the portion of the substrate 1 of the gas sensor device 200 having the plurality of first through holes 101 matches the position of the opening 61 of the housing 60.
- the first through hole 101 and the opening 61 are arranged so as to communicate with each other, and the gas sensor device 200 is mounted on the housing 60.
- a ring-shaped seal member 62 is arranged between the gas sensor device 200 and the housing 60 along the outer edge of the opening 61.
- the seal member 62 joins the first layer 10 and the housing 60 so as to ensure waterproofness between the first layer 10 and the housing 60 on the substrate 1 of the gas sensor device 200.
- the sealing member 62 may be a solder material, an O-ring, or a gasket. Examples of the material of the sealing member 62 include rubbery resins and metals such as solder.
- FIG. 29 is a cross-sectional view of an electronic device 302 including the gas sensor device 200J1.
- the electronic device 302 has a gas sensor device 200J1, a mounting board 51, and a housing 60.
- the gas sensor device 200J1 differs from the gas sensor device 200J (see FIG. 24) in that the through conductor 22B penetrates the first layer 10 and the second layer 11 of the substrate 1 instead of the frame portion 12.
- the gas sensor device 200J1 includes a lid 72, and the gas sensor element 3G is sealed and protected by the lid 72. Further, the gas sensor device 200J1 has a terminal electrode 22D connected to the through conductor 22B on the surface of the first layer 10.
- the gas sensor device 200J1 may not include the sealing member 13.
- the mounting board 51 is, for example, a printed circuit board (PCB) having an opening 52, and has a wiring 53 and an external electrode 54.
- PCB printed circuit board
- the electronic device 302 is arranged so that the position of the portion of the substrate 1D of the gas sensor device 200J1 having the plurality of first through holes 101 matches the position of the opening 52 of the mounting substrate 51.
- the first through hole 101 and the opening 52 are arranged so as to communicate with each other, and the gas sensor device 200J1 is mounted on the mounting board 51.
- the terminal electrode 22D of the gas sensor device 200J1 and the external electrode 54 of the mounting substrate 51 are bonded to each other by a conductive bonding material 55 such as solder.
- a conductive bonding material 55 such as solder
- a sealing ring 56 is formed on the surface facing the gas sensor device 200J1 so as to surround the outer periphery of the opening 52. Further, in the gas sensor device 200J1, a sealing ring 24 having the same shape as the sealing ring 56 is formed at a position facing the mounting substrate 51. The sealing ring 56 and the sealing ring 24 are joined by a sealing joining material 7. The sealing ring 56 and the sealing ring 24 are formed as a metal layer such as a metallized layer or a plating layer of a conductor material, respectively.
- the electronic device 302 is arranged so that the position of the opening 52 of the mounting board 51 matches the position of the opening 61 of the housing 60, and the mounting board 51 is mounted on the housing 60.
- a ring-shaped sealing member 62 is arranged between the mounting board 51 and the housing 60 along the outer edge of the opening 61.
- FIG. 30 is a cross-sectional view of an electronic device 303 including a gas sensor device 200.
- the electronic device 303 includes a gas sensor device 200, a mounting board 50, a housing 60, and a gasket 70.
- the gas sensor device 200 is mounted on the mounting board 50.
- the position of the portion of the substrate 1 of the gas sensor device 200 having the plurality of first through holes 101 is arranged so as to match the position of the opening 61 of the housing 60, and the gas sensor device 200 is provided by the gasket 70. It is joined to the housing 60.
- the gasket 70 has the shape of, for example, an inward flange extending from the mounting substrate 50 to the housing 60.
- the gasket 70 covers the periphery of the gas sensor device 200 and also covers a part of the first layer 10 of the gas sensor device 200 so as to ensure waterproofness between the first layer 10 and the housing 60.
- the material of the gasket 70 may be a rubbery resin or the like, and is not particularly limited.
- FIG. 31 is a cross-sectional view of an electronic device 304 including the barometric pressure sensor device 200L1.
- the electronic device 304 is different in that it includes the barometric pressure sensor device 200L1 in the same configuration as the electronic device 302 in the above-mentioned mounting example 2.
- the barometric pressure sensor device 200L1 has the following configuration different from that of the gas sensor device 200L (see FIG. 26).
- the barometric pressure sensor element 3H is mounted instead of the gas sensor element 3G.
- the ASIC4A is mounted on the barometric pressure sensor device 200L1.
- the sealing body 71 is filled in the accommodating recess of the barometric pressure sensor device 200L1.
- the sealing material may be a resin molded body or may be formed of another material.
- the sealed body 71 can be formed by coating (potting) with a resin or the like. Since the sealing body 71 is filled, the sealing member 13 is not always necessary.
- the barometric pressure sensor device 200L1 and the mounting board 50 are joined to the mounting board 50 via the conductive bonding material 55.
- the periphery of the barometric pressure sensor device 200L1 may be sealed with a sealing material 14 such as resin.
- a sealing material 14 such as resin
- FIG. 32 is a cross-sectional view of an electronic device 305 including a gas sensor device 200J (see FIG. 24). As shown in FIG. 32, the electronic device 305 is different in that it is provided with the gas sensor device 200J in place of the gas sensor device 200 in the same configuration as the electronic device 303 in the above-mentioned mounting example 3. In the electronic device 305, the terminal electrode 22D of the gas sensor device 200J and the electrode of the mounting substrate 50 are bonded to each other by a conductive bonding material 55 such as solder.
- a conductive bonding material 55 such as solder.
- the gasket 70 is bonded to the mounting substrate 50 via the conductive bonding material 55.
- the gas sensor device 200J does not have to include the sealing member 13.
- FIG. 33 is a cross-sectional view of an electronic device 306 including a gas sensor device 200J (see FIG. 24). As shown in FIG. 33, the electronic device 306 is different in that it is provided with the sealing member 62 instead of the gasket 70 in the same configuration as the electronic device 305 in the above-mentioned mounting example 5. In the electronic device 306, a ring-shaped sealing member 62 is arranged between the gas sensor device 200J and the housing 60 along the outer edge of the opening 61.
- Sensor device 200K Barometric pressure sensor device (sensor device) 301, 302, 303, 304, 305, 306 ...
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Abstract
Description
以下、本開示の一実施形態について、添付の図面を参照して詳細に説明する。図1は、本開示の実施形態1に係る例示的な基板1を、基板1に垂直かつX軸方向に平行な面で切断したときの断面図である。図面において、X-Y平面は、基板1の上面または底面に平行な面であり、Z軸は、X-Y平面と垂直に交わる軸である。本明細書における基板の断面図は、特に明示しない限り図1と同様の面で切断した時の断面図である。また、後述する基板を含むパッケージおよびセンサ装置の断面図についても、特に明示しない限り図1と同様の面で切断した時の断面図である。
図2は、実施形態1に係る別の例示的な基板1Aの断面図である。基板1Aは、図2に示すように、基板1Aを第2-1面112Aの側から平面視したときに、1つの第2貫通孔111Aに対して、1つの第1貫通孔101が重なっている点が上述の基板1と異なる。上記実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を繰り返さない。他の変形例および実施形態についても同様である。
第1貫通孔101について、図3~図10を用いて以下に詳述する。第1貫通孔101についての以下の記載は、上述した第1貫通孔101Aおよび以下に説明する全ての第1貫通孔についても同じ内容を言及することができることに留意されたい。
以下では、水深1mの水圧を30分間かけたときに浸水するか否かを、第1貫通孔101の直径D1と、貫通孔の厚みTsを種々変化させて調査した防水試験について図11を用いて説明する。図11は、防水試験に用いた装置の概要を示す図である。評価サンプル510の上面から水面までが1mの状態で、評価サンプル510を30分間没したときに浸水しない場合、IPX7レベルの防水性能を有していると判断することができる。
以下では、第1貫通孔101と導通するパッケージ内の空間体積Vに対して、防水効果を有する第1貫通孔101の総体積V’が有する割合(V’/V)と、防水性能との関係について調査した防水試験2について図12を用いて説明する。図12は、防水試験2に用いた評価サンプル520の断面図である。
本開示の他の実施形態について、以下に説明する。説明の便宜上、上記実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を繰り返さない。以降の実施形態においても同様である。
図13は、ガスセンサ装置200を、基板1の断面図である。ガスセンサ装置200は、パッケージ100と、ガスセンサ素子3Gとを備える。パッケージ100は、基板1(第2基板)と、センサ素子を収容する収容凹部21および配線導体22を有する配線基板2(第1基板)とを備える。基板1は、パッケージ100の蓋体である。ガスセンサ装置200(パッケージ100)は、例えば、平面視において長方形状、または正方形状などの四角形状であり得る。
パッケージ100は、ガスセンサ素子3Gを収容する収容凹部21を有する配線基板2と、収容凹部21を塞ぐ基板1とを備える。基板1は、複数の第1貫通孔101を有するセラミック絶縁層である第1層10と、少なくとも1つの第2貫通孔111を有するセラミック絶縁層である第2層11とを含む。第1貫通孔101の直径は、10~50μmであり、第2貫通孔111の直径は、第1貫通孔101の直径よりも大きい。複数の第1貫通孔101の少なくとも一部は、第1層10の平面視において第2貫通孔111と重なる位置にあり、第2層11が収容凹部21側にある。
図14は、実施形態2に係る別の例示的なガスセンサ装置200Aの断面図である。ガスセンサ装置200Aは、パッケージ100Aと、ガスセンサ素子3Gとを備えている。パッケージ100Aは、実施形態1に係る基板1と、実施形態2に係る配線基板2とを備える。パッケージ100Aは、基板1の向きが上述した実施形態2のパッケージ100と異なっている。具体的には、図14に示すように、ガスセンサ装置200Aでは、基板1において、第2-1面112がパッケージ100Aの外表面の一部を構成しており、第1-1面102がガスセンサ素子3Gと対向している。すなわち、変形例2-1のように、第1層10が収容凹部21側にあってもよい。それ以外については、図13のガスセンサ装置200と同様である。
図15は、実施形態2に係る別の例示的なガスセンサ装置200Bの断面図である。ガスセンサ装置200Bは、パッケージ100Bと、ガスセンサ素子3Gとを備えている。パッケージ100Bは、実施形態1の変形例1-1に係る基板1Aと、実施形態2に係る配線基板2とを備えている。
図16は、実施形態2に係る別の例示的なガスセンサ装置200Cの断面図である。ガスセンサ装置200Cは、パッケージ100Cと、ガスセンサ素子3Gとを備えている。パッケージ100Cは、基板1Aの向きが上述の変形例2-2のパッケージ100Bと異なっている。具体的には、図16に示すように、ガスセンサ装置200Cでは、基板1Aにおいて、第2-1面112Aがパッケージ100Aの外表面の一部を構成しており、第1-1面102Aがガスセンサ素子3Gと対向している。それ以外については、図15のガスセンサ装置200Bと同様である。
変形例2-4では、図19を用いて、第1貫通孔101から水が浸入してしまった場合に、浸入した水がガスセンサ素子3Gに到達する可能性を低減する追加の構成について説明する。
変形例2-5では、パッケージ内に複数のセンサ素子を搭載する例、ならびにASIC(Application Specific Integrated Circuit)などのICチップおよび/またはコンデンサなどを搭載したセンサ装置について説明する。
本実施形態では、実施形態1に係る基板1の別の実施形態について、図22および図23を用いて説明する。図22は、実施形態3に係る例示的な基板1Dの断面図である。図23の符号2301は、基板1Dを第1-1面102側から見た斜視図であり、符号2302は、基板1Dを枠部12の側から見た斜視図である。
図22では、基板1Dは第1層10と、第2層11と、枠部12とを含む積層体としての例を示しているが、第1層10Aと、複数の第2貫通孔111を有する第2層11Aと、枠部12とを含む積層体であってもよい。
実施形態4では、実施形態3に記載の基板1Dにセンサ素子3の一例としてガスセンサ素子3Gを搭載したガスセンサ装置200Jについて説明する。図24は、ガスセンサ装置200Jの断面図である。図24は、ガスセンサ装置200Jが実装基板50に実装されている状態における断面を示している。実施形態4では、ガスセンサ素子3Gを搭載したガスセンサ装置200Jについて説明するが、搭載するセンサ素子は、ガスセンサ素子3Gに限定されない。実施形態4に例示するガスセンサ装置200Jの構成は、センサ素子を搭載するパッケージに通気性が必要とされるセンサ素子を搭載したセンサ装置として適用され得る。当該センサ素子3は、例えば気体の性質を検知するセンサであり、より具体的にはガスセンサ素子、気圧センサまたは湿度センサなどが挙げられ得る。また、センサ素子3はMEMS素子であってもよく、この場合にはより小型のセンサ装置とすることができる。
ガスセンサ装置200Jは、基板1Dと、ガスセンサ素子3Gとを備える。
図25は、実施形態4に係る別の例示的な気圧センサ装置200Kの断面図である。気圧センサ装置200Kは、基板1Dと、気圧センサ素子3Hとを備えている。気圧センサ装置200Kは、搭載しているセンサ素子が気圧センサ素子3Hである点および気圧センサ素子3Hと基板1Dとの接続の態様が実施形態4のガスセンサ装置200Jと異なる。
変形例4-2では、実施形態3(図22参照)に係る別の例示的な基板1Eに、ガスセンサ素子3Gを搭載したガスセンサ装置200Lについて説明する。図26は、ガスセンサ装置200Lの断面図である。
以下、本開示の一態様におけるガスセンサ装置を実装した電子機器の一例について、図28~図33を用いて説明する。以下に説明する電子機器への実装例は例示である。本開示の一態様におけるガスセンサ装置が、その他の公知の実装態様にて電子機器に実装されていてもよい。また、以下に説明する電子機器に実装されているガスセンサ装置は一例であって、本開示で示した範囲で種々変更されてよいことは勿論である。
図28は、ガスセンサ装置200(図13参照)を備える電子機器301の断面図である。図28では、電子機器301におけるガスセンサ装置200が搭載されている部分の付近について示している。電子機器の断面図において示している範囲は、繰り返して記載しないが以下の実装例においても同様である。
図29は、ガスセンサ装置200J1を備える電子機器302の断面図である。図29に示すように、電子機器302は、ガスセンサ装置200J1と、実装基板51と、筐体60と、を有している。ガスセンサ装置200J1は、ガスセンサ装置200J(図24参照)と同様の構成において、貫通導体22Bが枠部12ではなく、基板1の第1層10および第2層11を貫通している点で異なっている。ガスセンサ装置200J1は、蓋体72を備えており、ガスセンサ素子3Gは、蓋体72によって封止され、保護されている。また、ガスセンサ装置200J1は、第1層10の表面に、貫通導体22Bと接続する端子電極22Dを有している。ガスセンサ装置200J1は、封止部材13を備えていなくてもよい。
図30は、ガスセンサ装置200を備える電子機器303の断面図である。図30に示すように、電子機器303は、ガスセンサ装置200と、実装基板50と、筐体60と、ガスケット70と、を有している。ガスセンサ装置200は、実装基板50に実装されている。
図31は、気圧センサ装置200L1を備える電子機器304の断面図である。図31に示すように、電子機器304は、前述の実装例2における電子機器302と同様の構成において、気圧センサ装置200L1を備える点で異なっている。そして、気圧センサ装置200L1は、ガスセンサ装置200L(図26参照)と比較して、以下構成が異なっている。(i)ガスセンサ素子3Gではなく、気圧センサ素子3Hを搭載している。(ii)気圧センサ装置200L1上にASIC4Aが搭載されている。(iii)気圧センサ装置200L1の収容凹部内に、封止体71が充填されている。
図32は、ガスセンサ装置200J(図24参照)を備える電子機器305の断面図である。図32に示すように、電子機器305は、前述の実装例3における電子機器303と同様の構成において、ガスセンサ装置200に代替してガスセンサ装置200Jを備える点で異なっている。そして、電子機器305は、はんだ等の導電性接合材55によって、ガスセンサ装置200Jの端子電極22Dと実装基板50の電極とが互いに接合されている。
図33は、ガスセンサ装置200J(図24参照)を備える電子機器306の断面図である。図33に示すように、電子機器306は、前述の実装例5における電子機器305と同様の構成において、ガスケット70に代替してシール部材62を備える点で異なっている。電子機器306は、ガスセンサ装置200Jと筐体60との間に、開口部61の外縁に沿うようにリング状のシール部材62が配置されている。
2、2A、2B、2C・・・配線基板
3・・・センサ素子(3G:ガスセンサ素子、3H:気圧センサ素子)
12・・・枠部
13・・・封止部材
21、21D、21E・・・収容凹部
22・・・配線導体
31G・・・感ガス部
50、51・・・実装基板
60・・・筐体
100、100A、100B、100C、100D、100E・・・パッケージ
101、101A、101B、101C、101D、101E、101F、101G、101H、101I・・・第1貫通孔
111、111’、111A・・・第2貫通孔
200、200A、200B、200C、200D、200E、200F、200G、200J、200J1、200J2、200L・・・ガスセンサ装置(センサ装置)
200H、200I・・・センサ装置
200K・・・気圧センサ装置(センサ装置)
301、302、303、304、305、306・・・電子機器
Claims (24)
- 複数の第1貫通孔を有するセラミック絶縁層である第1層と、
前記第1層に対して積層され、少なくとも1つの第2貫通孔を有するセラミック絶縁層である第2層と、を含み、
前記第1貫通孔の直径は、10~50μmであり、
前記第2貫通孔の直径は、前記第1貫通孔の直径よりも大きく、
前記複数の第1貫通孔の少なくとも一部は、前記第1層の平面視において前記第2貫通孔と重なる位置にある基板。 - 前記第1層の厚さは、50~150μmである、請求項1に記載の基板。
- 前記第2層の平面視において、1つの前記第2貫通孔に対して前記複数の第1貫通孔が重なっている、請求項1または2に記載の基板。
- 前記第2層は、複数の前記第2貫通孔を有する、請求項1から3のいずれか1項に記載の基板。
- 前記第1層を、当該第1層の表面に対して垂直な平面で切断したときの断面における前記第1貫通孔の内壁面がなす線分と、前記断面における前記第1層の表面がなす線分との角度のうち、小さい方の角度は、80°以上90°以下である請求項1から4のいずれか1項に記載の基板。
- 前記第1貫通孔の一方の開口部の中心と、他方の開口部の中心とを結ぶ線は、前記第1層の表面に対して、90°±10°である、請求項1~5のいずれか1項に記載の基板。
- 前記第1貫通孔は、前記第2層の平面視において、前記第2貫通孔の外縁から離隔した位置にある、請求項1~6のいずれか1項に記載の基板。
- 前記複数の第1貫通孔は、前記第1層の平面視において、千鳥配列を有している、請求項1~7のいずれか1項に記載の基板。
- 前記第1層または前記第2層の表面において、前記第1貫通孔および前記第2貫通孔を取り囲むように位置する枠部と、
前記枠部の内部または表面に位置する配線導体と、を有する、請求項1~8のいずれか1項に記載の基板。 - 前記枠部が前記第1層の表面に位置し、
前記第2貫通孔の直径は、100μm以上200μm以下である、請求項9に記載の基板。 - 蓋体としての請求項1~8のいずれか1項に記載の基板と、
センサ素子を収容する収容凹部および配線を有する配線基板と、を備えるパッケージであって、
前記第1層が、前記収容凹部の側にあり、
前記第2貫通孔の直径は、100μm以上200μm以下であり、
前記第1層の、前記収容凹部の側の面と、前記収容凹部とによって規定される体積をV、
前記第1貫通孔および前記第2貫通孔の体積の総和をV’としたときに、
V’/V≧0.05%である、パッケージ。 - 請求項1から10のいずれか1項に記載の基板と、センサ素子とを備えるセンサ装置。
- 請求項10に記載の基板と、センサ素子とを備え、
前記センサ素子は、前記枠部内で前記基板に搭載されており、
前記基板と前記センサ素子との間の空間の体積をV、
前記第1貫通孔および前記第2貫通孔の体積の総和をV’としたときに、
V’/V>0.3%である、センサ装置。 - 請求項11に記載のパッケージと、センサ素子とを備えるセンサ装置。
- 前記センサ素子は、気体の性質を検知する気体センサ素子である、請求項12から14のいずれか1項に記載のセンサ装置。
- 請求項12から15のいずれか1項に記載のセンサ装置を備える、電子機器。
- センサ素子を収容する収容凹部を有する第1基板と、
前記収容凹部を塞ぐ第2基板と、を備えるパッケージであって、
前記第2基板は、複数の第1貫通孔を有するセラミック絶縁層である第1層と、
前記第1層に対して積層され、少なくとも1つの第2貫通孔を有するセラミック絶縁層である第2層と、を含み、
前記第1貫通孔の直径は、10~50μmであり、
前記第2貫通孔の直径は、前記第1貫通孔の直径よりも大きく、
前記複数の第1貫通孔の少なくとも一部は、前記第1層の平面視において前記第2貫通孔と重なる位置にあり、
前記第2層が前記収容凹部側にある、パッケージ。 - センサ素子が搭載される基板であって、
前記基板は、複数の第1貫通孔を有するセラミック絶縁層である第1層と、
前記第1層に対して積層され、少なくとも1つの第2貫通孔を有するセラミック絶縁層である第2層と、
前記第2層の表面において、前記第1貫通孔および前記第2貫通孔を取り囲むように位置する枠部と、
配線導体と、を有しており、
前記第1貫通孔の直径は、10~50μmであり、
前記第2貫通孔の直径は、前記第1貫通孔の直径よりも大きく、
前記複数の第1貫通孔の少なくとも一部は、前記第1層の平面視において前記第2貫通孔と重なる位置にある、基板。 - 請求項17に記載のパッケージと、センサ素子とを備える、センサ装置。
- 請求項18に記載の基板と、センサ素子とを備える、センサ装置。
- 前記センサ素子は、前記基板に対してフリップチップ接続される、請求項20に記載のセンサ装置。
- 前記基板と、前記センサ素子との間に、前記第1貫通孔と導通する空間の体積を低減する封止部材を備える、請求項20または21に記載のセンサ装置。
- 前記センサ素子はガスセンサ素子であり、
前記ガスセンサ素子は、前記基板側に突出した感ガス部を備え、
前記感ガス部は、前記第2貫通孔内に収容されている、請求項20~22のいずれか1項に記載のセンサ装置。 - 請求項19から23のいずれか1項に記載のセンサ装置を備える電子機器。
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JPH0921774A (ja) * | 1995-07-10 | 1997-01-21 | Matsushita Electric Ind Co Ltd | 湿度及びガス検出素子とその製造方法 |
JPH0948087A (ja) * | 1995-05-26 | 1997-02-18 | Ngk Insulators Ltd | 微細貫通孔を有するセラミック部材の製造方法 |
JP2014519042A (ja) * | 2011-06-08 | 2014-08-07 | アルファ モス エス.アー. | 多階層構造を有する化学抵抗器型ガス・センサ |
JP2015200644A (ja) * | 2014-04-07 | 2015-11-12 | イノチップ テクノロジー シーオー エルティディー | センサー素子 |
US20160146752A1 (en) * | 2014-11-21 | 2016-05-26 | Robert Bosch Gmbh | Device for Detecting at least One Gaseous Analyte and Method for the Production Thereof |
-
2021
- 2021-12-13 JP JP2022569962A patent/JPWO2022131181A1/ja active Pending
- 2021-12-13 CN CN202180083942.9A patent/CN116583942A/zh active Pending
- 2021-12-13 WO PCT/JP2021/045724 patent/WO2022131181A1/ja active Application Filing
- 2021-12-13 US US18/266,650 patent/US20240044828A1/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0948087A (ja) * | 1995-05-26 | 1997-02-18 | Ngk Insulators Ltd | 微細貫通孔を有するセラミック部材の製造方法 |
JPH0921774A (ja) * | 1995-07-10 | 1997-01-21 | Matsushita Electric Ind Co Ltd | 湿度及びガス検出素子とその製造方法 |
JP2014519042A (ja) * | 2011-06-08 | 2014-08-07 | アルファ モス エス.アー. | 多階層構造を有する化学抵抗器型ガス・センサ |
JP2015200644A (ja) * | 2014-04-07 | 2015-11-12 | イノチップ テクノロジー シーオー エルティディー | センサー素子 |
US20160146752A1 (en) * | 2014-11-21 | 2016-05-26 | Robert Bosch Gmbh | Device for Detecting at least One Gaseous Analyte and Method for the Production Thereof |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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FR3138562A1 (fr) * | 2022-08-01 | 2024-02-02 | Stmicroelectronics (Grenoble 2) Sas | Boîtier de circuit integre |
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US20240044828A1 (en) | 2024-02-08 |
JPWO2022131181A1 (ja) | 2022-06-23 |
CN116583942A (zh) | 2023-08-11 |
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