WO2015163192A1 - 電子素子実装用基板および電子装置 - Google Patents
電子素子実装用基板および電子装置 Download PDFInfo
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- WO2015163192A1 WO2015163192A1 PCT/JP2015/061456 JP2015061456W WO2015163192A1 WO 2015163192 A1 WO2015163192 A1 WO 2015163192A1 JP 2015061456 W JP2015061456 W JP 2015061456W WO 2015163192 A1 WO2015163192 A1 WO 2015163192A1
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- Prior art keywords
- wiring board
- metal plate
- electronic device
- electronic element
- wiring
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Definitions
- the present invention relates to an electronic device mounting on which an electronic component, for example, an image pickup device such as a CCD (Charge-Coupled Device) type or a CMOS (Complementary Metal-Oxide Semiconductor) type, or a light-emitting device such as an LED (Light Emitting Diode) is mounted.
- an image pickup device such as a CCD (Charge-Coupled Device) type or a CMOS (Complementary Metal-Oxide Semiconductor) type
- a light-emitting device such as an LED (Light Emitting Diode) is mounted.
- the present invention relates to a circuit board and an electronic device.
- an electronic apparatus in which an electronic element is mounted on an electronic element mounting board is known.
- an electronic element mounting board used in such an electronic device a first wiring board, a metal plate bonded to the lower surface of the first wiring board, and an electronic element connection pad provided on the upper surface of the first wiring board.
- An electronic device includes an electronic element mounted on an electronic element mounting substrate, and a lid or the like provided on the upper surface of the electronic element mounting substrate.
- an electronic element is mounted in a recess formed by an upper surface of a metal plate and an inner surface of a first wiring board, and an external circuit connection electrode provided on a surface such as the upper surface of the first wiring board.
- An external circuit or the like is electrically connected to (see Japanese Patent Laid-Open No. 2006-303400).
- the metal plate has a larger coefficient of thermal expansion than the first wiring substrate. Therefore, when a metal plate is provided on the lower surface of the first wiring board constituting the electronic element mounting substrate and the electronic element is mounted on the upper surface of the metal plate, the first wiring board and the metal plate are generated by heat generated during operation of the electronic element. Thermal stress occurs between the two. This thermal stress is concentrated on the adhesive member that bonds the first wiring board and the metal plate, and there is a possibility that cracking or peeling occurs. Therefore, it has been considered to reduce the bonding area between the metal plate and the first wiring board. Therefore, there has been known an electronic element mounting substrate in which the peripheral portion of the metal plate is located inside the peripheral portion of the first wiring board when viewed from above.
- the upper surface of the first wiring substrate in the step of mounting a component such as a lens housing, a lid or an electronic component on the upper surface of the first wiring substrate, or the step of performing wire bonding on the upper surface of the first wiring substrate, the upper surface of the first wiring substrate.
- a force is applied from the direction toward the bottom surface.
- the electronic device mounting substrate having the above-described configuration there is no supporting object in the region where the first wiring substrate and the metal plate do not overlap, and there is a space corresponding to the thickness of the metal plate. Therefore, when a force is applied in the direction from the upper surface to the lower surface of the first wiring board, a bending stress starting from the peripheral edge of the metal plate is generated in the first wiring board, and the first wiring board is cracked or cracked. There was concern about the outbreak. Further, the first wiring board is required to be thin. Due to this thinning, there was a greater concern about the occurrence of cracks or cracks in the first wiring board.
- the object of the present invention is to suppress the occurrence of cracks or cracks in the first wiring board that overlaps the peripheral edge of the metal plate when viewed from above, and to reduce the overall thickness even when the second wiring board is connected. It is an object of the present invention to provide an electronic element mounting substrate that can be used, and an electronic device using the electronic element mounting substrate.
- the electronic element mounting substrate includes a frame-shaped first wiring substrate having an inner portion as a first through hole and an external circuit connection electrode on the lower surface.
- an outer edge provided on the lower surface of the first wiring board so as to cover the opening of the first through hole is located between the outer edge of the first wiring board and the inner edge of the first wiring board,
- a plate-shaped metal plate having an electronic element mounting portion is provided in a region surrounded by the first wiring board on the upper surface.
- it has the 2nd wiring board which was provided in the circumference
- An electronic device includes the above-described electronic element mounting substrate and an electronic element mounted on the electronic element mounting portion of the metal plate.
- FIG. (A) is a top view showing the appearance of the electronic device mounting substrate and the electronic device according to the first embodiment of the present invention, and (b) is a longitudinal section corresponding to the AA line of (a).
- FIG. (A) is a top view which shows the external appearance of the electronic device mounting board
- (A) is a bottom view of the electronic device mounting substrate according to the first embodiment shown in FIG. 1, and (b) is an electronic device mounting according to another aspect of the first embodiment shown in FIG. FIG.
- FIG. (A) is a top view showing an external appearance of an electronic device mounting substrate and an electronic device according to a second embodiment of the present invention, and (b) is a longitudinal section corresponding to line AA in (a).
- FIG. (A) is a top view showing an external appearance of an electronic device mounting board and an electronic device according to a third embodiment of the present invention, and (b) is a longitudinal section corresponding to line AA in (a).
- FIG. (A) is a top view which shows the external appearance of the electronic module which has the electronic device mounting board
- (A) is a top view showing an external appearance of an electronic device mounting board and an electronic device according to a fifth embodiment of the present invention, and (b) is a longitudinal section corresponding to line AA in (a).
- an electronic device is a configuration in which an electronic element is mounted on an electronic element mounting board and a lid is bonded to the upper surface of the electronic element mounting board.
- the electronic element mounting substrate and the electronic device may be either upward or downward, but for convenience, the orthogonal coordinate system xyz is defined and the positive side in the z direction is defined as the upper surface. Or use the word on the bottom.
- the electronic device 21 and the electronic element mounting substrate 1 according to the first embodiment of the present invention will be described with reference to FIGS.
- the electronic device 21 in this embodiment includes an electronic element mounting substrate 1 and an electronic element 10.
- an electronic element mounting substrate 1 includes a frame-shaped first wiring substrate 2 having an inner portion as a first through hole 2a and an external circuit connection electrode 9 on the lower surface, The outer edge is provided between the outer edge of the first wiring board 2 and the inner edge of the first wiring board 2 so as to cover the opening of the first through hole 2a on the lower surface of the first wiring board 2, and A frame-shaped metal plate 4 having an electronic element mounting portion 11 in a region surrounded by one wiring substrate 2 and an outer circuit connection electrode provided in a peripheral region 5 of the metal plate 4 on the lower surface of the first wiring substrate 2 9 and a second wiring board 6 electrically connected to 9.
- the first wiring board 2 has a first through hole 2a and an external circuit connection electrode 9 on the lower surface.
- an electronic element connection pad 3 is provided on the upper surface of the first wiring board 2.
- An external circuit connection electrode 9 is provided on the lower surface of the first wiring board 2.
- the first wiring board 2 is formed by forming a wiring conductor described later on an insulating board.
- insulating substrate for example, electrically insulating ceramics or resins are used.
- Examples of the electrically insulating ceramic used as the material of the insulating substrate of the first wiring board 2 include an aluminum oxide sintered body, a mullite sintered body, a silicon carbide sintered body, an aluminum nitride sintered body, and a nitrided body. Examples thereof include a silicon sintered body and a glass ceramic sintered body.
- Examples of the resin used as the material for the insulating substrate of the first wiring board 2 include epoxy resin, polyimide resin, acrylic resin, phenol resin, and fluorine resin.
- Examples of the fluorine-based resin include a polyester resin and a tetrafluoroethylene resin.
- each of the first wiring boards 2 is formed by laminating a plurality of insulating layers made of the above-described materials.
- the first wiring board 2 may be formed of two insulating layers as in the examples shown in FIGS. 1 and 2, or may be formed of a single layer or three or more insulating layers. In the example shown in FIGS. 1 and 2, the first wiring board 2 is formed of two insulating layers.
- the first wiring board 2 may be provided with a wiring conductor composed of a through conductor and an internal wiring for conducting each insulating layer.
- the first wiring board 2 has a wiring conductor exposed on the surface. You may do it.
- the external circuit connection electrode 9 and the electronic element connection pad 3 may be electrically connected by the wiring conductor.
- the respective wiring conductors provided in the respective frames forming the first wiring board 2 may be electrically connected by wiring conductors exposed on the surfaces of the respective frames.
- the first wiring board 2 may be provided with the external circuit connection electrodes 9 on the upper surface or the side surface.
- the external circuit connection electrode 9 is provided, for example, to electrically connect the electronic device 21 to a second wiring board 6 described later, or to an external device or the like.
- the electronic element connecting pad 3, the external circuit connecting electrode 9 and the wiring conductor are tungsten (W), molybdenum (Mo), manganese (Mn), silver when the first wiring board 2 is made of an electrically insulating ceramic. (Ag) or copper (Cu), or an alloy containing at least one metal material selected from these.
- the electronic element connecting pad 3, the external circuit connecting electrode 9, and the wiring conductor are copper (Cu), gold (Au), aluminum (Al), nickel ( Ni), chromium (Cr), molybdenum (Mo), titanium (Ti), or an alloy containing at least one metal material selected from these.
- a plating layer is provided on the exposed surface of the electronic element connecting pad 3, the external circuit connecting electrode 9, and the wiring conductor. According to this configuration, it is possible to protect the exposed surface of the electronic element connection pad 3, the external circuit connection electrode 9, and the wiring conductor and prevent oxidation. Further, according to this configuration, the electrical connection between the electronic element connection pad 3 and the electronic element 10 through wire bonding or the like, or the external circuit connection electrode 9 and the electrode provided on the surface of the second wiring substrate 6 And can be electrically connected well.
- the plating layer for example, a Ni plating layer having a thickness of 0.5 to 10 ⁇ m is deposited. Alternatively, a gold (Au) plating layer having a thickness of 0.5 to 3 ⁇ m may be deposited on the Ni plating layer.
- the metal plate 4 is provided on the lower surface of the first wiring board 2 so as to cover the opening of the first through hole 2a, and an electronic element mounting portion is provided at the center of the upper surface. 11.
- the electronic element 10 is mounted on the electronic element mounting portion 11, and the electronic element 10 includes the inner side surface of the first through hole 2 a of the first wiring substrate 2 and the metal plate 4. Is housed in a recess formed by the upper surface of the.
- the outer peripheral edge of the metal plate 4 is located inside the outer peripheral edge of the first wiring board 2 in plan view.
- the bonding area between the metal plate 4 and the first wiring board 2 can be reduced. Therefore, when the electronic element 10 generates heat and a difference in thermal expansion occurs between the metal plate 4 and the first wiring board 2, stress applied between the first wiring board 2 and the metal plate 4 can be reduced. it can.
- the outer peripheral portion of the upper surface of the metal plate 4 is bonded to the lower surface of the first wiring substrate 2 by a bonding material 15 made of brazing material, thermosetting resin, low melting point glass, or the like.
- a bonding material 15 made of brazing material, thermosetting resin, low melting point glass, or the like.
- the thermosetting resin for example, bisphenol A type liquid epoxy resin or the like is used.
- the bonding material 15 is preferably provided continuously in an annular shape. Thereby, since the joining material 15 is provided over the perimeter of the metal plate 4, the airtightness of the area
- the second wiring board 6 is provided on the lower surface of the first wiring board 2 in the peripheral region of the metal plate 4 and is connected to the external circuit connection electrode 9. Has been.
- the peripheral region 5 may be interpreted as a region where the metal plate 4 is not formed on the lower surface of the first wiring board 2.
- the second wiring substrate 6 is provided in the peripheral region 5, the lower surface of the first wiring substrate 2 is supported by the second wiring substrate even when a force is applied to the upper surface of the first wiring substrate 2. It will be. Therefore, it is possible to suppress the occurrence of bending stress starting from the peripheral edge of the metal plate 4 on the first wiring board 2 and to reduce the occurrence of cracks or cracks in the first wiring board 2. .
- the first wiring board is provided with a protruding portion that protrudes toward a region of the lower surface of the first wiring board that does not overlap the metal plate when viewed from the upper surface.
- the second wiring substrate 6 since the second wiring substrate 6 is provided in the peripheral region 5 without providing the protruding portion, the second wiring substrate 6 that should have been provided on the upper surface of the first wiring substrate is accommodated in the space for the protruding portion. be able to. Therefore, the entire thickness of the electronic element mounting substrate 21 can be reduced.
- the second wiring substrate 6 is formed by forming a wiring conductor described later on an insulating substrate.
- insulating substrate for example, electrically insulating ceramics or resins are used.
- Examples of the electrically insulating ceramic used as the material of the insulating substrate of the second wiring board 6 include an aluminum oxide sintered body, a mullite sintered body, a silicon carbide sintered body, an aluminum nitride sintered body, and a nitrided body. Examples thereof include a silicon sintered body and a glass ceramic sintered body.
- Examples of the resin used as the material for the insulating substrate of the second wiring board 6 include epoxy resin, polyimide resin, acrylic resin, phenol resin, or fluorine resin.
- Examples of the fluorine-based resin include a polyester resin and a tetrafluoroethylene resin.
- the second wiring board 6 it is preferable to use a resin as the material of the second wiring board 6.
- the second wiring board 6 made of a material having a low elastic modulus such as a resin, when a force is applied from the upper surface to the lower surface of the first wiring board 2 in, for example, a wire bonding process, the second wiring board 6 is used. It is possible to reduce the occurrence of chipping or the like at the peripheral edge of the wiring board 6.
- the peripheral portion (the negative direction side of x) of the second wiring substrate 6 is located inside the peripheral portion of the first wiring substrate 2.
- the outer side dimension of the electronic device 21 can be the dimension of the first wiring board 2. Become. Therefore, it is possible to keep the mounting area constant when mounting the electronic device 21 on an external device or the like.
- the distance from the peripheral edge of the first wiring board 2 to the peripheral edge of the second wiring board 6 is about 20 ⁇ m to 200 ⁇ m, the above-described effects can be enhanced.
- the peripheral edge (the negative direction side of x) of the second wiring board 6 may be located outside the peripheral edge of the first wiring board 2.
- the peripheral edge of the second wiring substrate 6 comes into contact with the external device first, so the first wiring substrate. It can reduce that a crack or a crack generate
- the peripheral edge portion of the second wiring substrate 6 is located outside the peripheral edge portion of the first wiring substrate 2 by 20 ⁇ m or more, the above-described effects can be obtained more reliably.
- the second wiring board 6 may be located outside the peripheral edge of the first wiring board 2 and may be joined to other circuits or components.
- the vertical thickness of the second wiring board 6 is equal to the vertical thickness of the metal plate 4, for example, in the step of fixing the electronic element 10 to the metal plate 4, the inclination of the electronic element mounting substrate 1 is increased. Can be reduced. Further, for example, in the step of bonding the electronic element 10 and the electronic element connection pad 3, the bonding between the electronic element 10 and the electronic element connection pad 3 is facilitated. Moreover, it becomes possible to suppress that the bending stress from the peripheral part of the metal plate 4 is applied to the 1st wiring board 2 is applied.
- the second wiring board 6 may be provided in a part of the peripheral region 5 of the metal plate 4. Further, it is preferable that the second wiring board 6 is provided in a portion having a large width in the peripheral region 5. As a result, the first wiring board 2 can be efficiently supported at the most easily deformable portion of the first wiring board 2. Therefore, it is possible to further suppress the bending stress from the peripheral edge of the metal plate 4 at the most easily deformable portion of the first wiring board 2, and the first wiring board is cracked or cracked. This can be reduced.
- the second wiring board 6 has a frame shape in which the inner part is a second through hole 6 a that is larger than the first through hole 2 a of the first wiring board 2. It is preferable. With this configuration, the entire outer periphery of the metal plate 4 is surrounded by the second wiring board 6. Therefore, the first wiring board 2 can be supported by the second wiring board 6 over the entire circumference of the outer edge of the first wiring board 2. Therefore, it is possible to suppress a bending stress from the peripheral edge of the metal plate 4 from being applied to the entire periphery of the outer edge of the first wiring board 2, and the first wiring board 2 is cracked or cracked. Can be reduced.
- the first wiring board 2 and the second wiring board 6 are connected via an external circuit connecting member 23, and the first wiring board 2 and the metal plate 4 are bonded to each other.
- the total thickness in the vertical direction of the second wiring board 6 and the external circuit connection member 23 is equal to the total thickness in the vertical direction of the metal plate 4 and the bonding material 15. This makes it possible to reduce the inclination of the electronic device mounting substrate 1 when mounting the electronic device, for example, and facilitates mounting of the electronic device 10. At this time, the thicknesses of the metal plate 4 and the bonding material 15 only have to be equal in design values, and an actual product may include an error in manufacturing.
- the electronic device 21 includes an electronic element mounting substrate 1 and an electronic element 10 mounted on the electronic element mounting portion 11 of the metal plate 4.
- the electronic device 21 has a lid 12 bonded to the upper surface of the electronic element mounting substrate 1.
- the electronic element 10 is, for example, an imaging element such as a CCD type or a CMOS type, or a light emitting element such as an LED.
- each electrode of the electronic element 10 is electrically connected to the electronic element connection pad 3 by a connection member 13 (bonding wire).
- the electronic element 10 may be bonded to the metal plate 4 with an adhesive 19 such as silver epoxy or thermosetting resin, for example.
- the lid 12 is a flat optical filter, for example.
- a highly transparent object such as a glass material or an optical filter may be used as the lid 12.
- the lid 12 may be a flat plate made of a metal material, for example, when the electronic element 10 is an arithmetic element such as a memory or an ASIC.
- the lid body 12 is joined to the upper surface of the frame body 2 by a joining member 14 such as a thermosetting resin or low-melting glass.
- an electronic component 22 such as a capacitor may be mounted on the upper surface of the first wiring board 2.
- the second wiring board 6 is provided at a position overlapping the connection terminal 24 of the electronic component 22 when viewed from above. Thereby, even when a force is applied to the upper surface of the first wiring substrate 2 in the step of mounting the electronic component 22, the lower surface of the first wiring substrate 2 can be supported by the second wiring substrate 6. For this reason, it is possible to suppress the bending stress starting from the peripheral portion of the metal plate from being applied to the first wiring board.
- the electronic component 22 may be provided on the side surface or the lower surface of the first wiring board 2.
- the electronic device 21 includes an electronic element mounting substrate 1 having the above configuration, an electronic element 10 mounted on the electronic element mounting portion 11 of the metal plate 4, and an upper surface of the frame 2 of the electronic element mounting substrate 1.
- an example of the manufacturing method shown below is a manufacturing method using a multi-piece wiring board.
- a ceramic green sheet constituting the first wiring board 2 is formed.
- first wiring board 2 is the quality sintered body
- MgO magnesia
- CaO calcia
- a ceramic green sheet for multi-piece production is obtained by a conventionally known forming method such as a doctor blade method or a calender roll method.
- the 1st wiring board 2 consists of resin
- the 1st wiring board 2 is formed by shape
- the first wiring board 2 may be obtained by impregnating a base material made of glass fiber with a resin such as glass epoxy resin.
- the first wiring substrate 2 can be formed by impregnating a base material made of glass fiber with an epoxy resin precursor and thermally curing the epoxy resin precursor at a predetermined temperature.
- a metal paste is applied to the ceramic element green sheet obtained in the above step (1) by the screen printing method or the like on the portions to be the electronic element connection pads 3, the external circuit connection electrodes 9, and the wiring conductors. Or fill.
- This metal paste is fired at the same time as the ceramic green sheet to be the first wiring board 2, thereby forming the electronic element connection pads 3, the external circuit connection electrodes 9, the wiring conductors, and the like.
- This metal paste is prepared by adjusting an appropriate viscosity by adding an appropriate solvent and binder to the metal powder made of the above-described metal material and kneading.
- the metal paste may contain glass or ceramics in order to increase the bonding strength with the first wiring board 2.
- ceramic green sheets to be the first wiring board 2 are manufactured by laminating and pressing the ceramic green sheets to be the insulating layers. Further, in this step, for example, after the green sheet laminates that are the respective layers of the first wiring substrate 2 are separately produced, a plurality of green sheet laminates are laminated and pressed, whereby the first wiring substrate 2 is obtained. A green sheet laminate may be produced.
- this ceramic green sheet laminate is fired at a temperature of about 1500 to 1800 ° C. to obtain a multi-piece wiring board in which a plurality of first wiring boards 2 are arranged.
- the above-described metal paste becomes the electronic element connection pad 3, the external circuit connection electrode 9, or the wiring conductor.
- the multi-cavity wiring board obtained by firing is divided into a plurality of first wiring boards 2.
- a dividing groove is formed in a multi-piece wiring board along a portion serving as the outer edge of the first wiring board 2, and a method of dividing by dividing along the dividing groove or a slicing method or the like.
- disconnect along the location used as the outer edge of the 1st wiring board 2 can be used.
- the dividing groove can be formed by cutting with a slicing device less than the thickness of the multi-cavity wiring board after firing, but the cutter blade is pressed against the ceramic green sheet laminate for the multi-cavity wiring board. Or by cutting with a slicing device smaller than the thickness of the ceramic green sheet laminate.
- a metal plate 4 to be bonded to the lower surface of the first wiring board 2 is prepared.
- the metal plate 4 is produced by punching or etching using a conventionally known stamping mold on a metal plate. Thereafter, when the metal plate 4 is made of a metal such as Fe—Ni—Co alloy, 42 alloy, Cu, or copper alloy, a nickel plating layer and a gold plating layer may be deposited on the surface thereof. Thereby, the oxidative corrosion of the surface of the metal plate 4 can be effectively prevented.
- thermosetting resin adheresive member
- a paste-like thermosetting resin is applied to one of the joint surfaces of the frame 2 or the metal plate 4 by a screen printing method, a dispensing method, etc., and a tunnel type atmosphere furnace or oven, etc.
- the first wiring board 2 and the metal plate 4 are stacked and passed through a tunnel-type atmosphere furnace or oven, and heated at about 150 ° C. for about 90 minutes, whereby the bonding material 15 is heated.
- the first wiring board 2 and the metal plate 4 are firmly bonded by thermosetting.
- the bonding material 15 is made of, for example, a main agent made of bisphenol A type liquid epoxy resin, bisphenol F type liquid epoxy resin, phenol novolac type liquid resin, etc., a filler made of spherical silicon oxide, etc., acid anhydride such as tetrahydromethyl phthalic anhydride, etc. It is obtained by adding a carbon powder or the like as a curing agent mainly composed of a product or the like, and mixing and kneading with a centrifugal stirrer or the like to obtain a paste.
- the bonding material 15 for example, bisphenol A type epoxy resin, bisphenol A modified epoxy resin, bisphenol F type epoxy resin, phenol novolac type epoxy resin, cresol novolac type epoxy resin, special novolac type epoxy resin, phenol Derivative epoxy resin, epoxy resin such as bisphenol skeleton type epoxy resin, etc. with addition of curing agent such as imidazole, amine, phosphorus, hydrazine, imidazole adduct, amine adduct, cationic polymerization, dicyandiamide, etc. Can be used.
- curing agent such as imidazole, amine, phosphorus, hydrazine, imidazole adduct, amine adduct, cationic polymerization, dicyandiamide, etc.
- the bonding material 15 can be made of low-melting glass other than resin.
- the low melting point glass is composed of, for example, a glass component containing 56 to 66% by mass of lead oxide, 4 to 14% by mass of boron oxide, 1 to 6% by mass of silicon oxide, and 1 to 11% by mass of zinc oxide, and zirconia oxide-silica as a filler.
- a compound to which 4 to 15% by mass of a compound is added is used.
- a glass paste is obtained by adding and mixing an appropriate organic solvent and solvent to the glass powder having these compositions. This glass paste is applied to one of the joint surfaces of the first wiring board 2 and the metal plate 4 by a conventionally known screen printing method and fired at a temperature of about 430 ° C.
- An adhesive member is fixed to the surface of the plate 4. Thereafter, the metal plate 4 and the first wiring board 2 are overlapped with each other and passed through a tunnel-type atmosphere furnace or oven, and heated to about 470 ° C., thereby melting and fixing the adhesive member, The 1st wiring board 2 and the metal plate 4 can be joined firmly.
- the second wiring board 6 is prepared.
- the second wiring board 6 is made of, for example, electrically insulating ceramics or resin.
- the manufacturing method can be manufactured by, for example, the same method as that for the first wiring board 2 described in (1) to (6).
- the second wiring substrate 6 is a flexible wiring substrate, for example, a circuit pattern formed on the substrate in a process of forming a photoresist layer on a substrate made of polyimide, a development (etching) stripping (DES) process, or the like. It can be manufactured through a process of bonding a polyimide cover film to the upper surface.
- the external circuit connection electrode 9 provided on the lower surface of the first wiring board 2 and the second wiring board 6 are joined via the external circuit connection member 23.
- the material of the external circuit connecting member 23 include those made of a metal material such as solder and those made of a resin such as an anisotropic conductive film.
- the external circuit connecting member 23 is made of, for example, solder or the like, it is bonded by applying cream solder or the like to the second wiring board 6, fixing the first wiring board 2 at a predetermined position, and applying reflow while applying pressure. , Can be electrically conducted.
- the external circuit connection member 23 when the external circuit connection member 23 is made of an anisotropic conductive resin or the like, the external circuit connection member 23 made of an anisotropic conductive resin at a predetermined position of the first wiring board 2 or the second wiring board 6. By applying, pressing and heating, the first wiring board 2 and the second wiring board 6 can be joined and electrically connected.
- first wiring board 2 and the second wiring board 6 may be further joined by the joining material 15 that joins the metal plate 4 and the first wiring board 2. In this way, by bonding the first wiring substrate 2 and the second wiring substrate 6, the electronic element mounting substrate 1 can be manufactured.
- the electronic element mounting substrate 1 is obtained by the steps (1) to (10). Note that the order of the steps (1) to (10) may be changed.
- the electronic device 21 can be manufactured by mounting the electronic device 10 on the electronic device mounting portion 11 of the electronic device mounting board 1 formed in this way.
- the electronic device 21 according to the present embodiment is different from the electronic device 21 according to the first embodiment in that there is a gap between the side surface of the metal plate 4 and the side surface of the second wiring substrate 6 on the metal plate 4 side when viewed from above. 7 and the first wiring board 2 has a stepped portion.
- the gap 7 is provided between the metal plate 4 and the second wiring board 6, so that when the second wiring board 6 and the first wiring board 2 are joined, It can suppress that 2 wiring board 6 and metal plate 4 contact, and it can control that a crack or a chip occurs in metal plate 4 or 2nd wiring board 6. Therefore, it is possible to reduce the dust generated from the metal plate 4 or the second wiring board 6 from entering the sealed space of the electronic element 10. Moreover, it can reduce that the 2nd wiring board 6 and the metal plate 4 overlap and are joined to the other. Therefore, it is possible to suppress the tilt of the electronic element mounting board 1 starting from the place where the second wiring board 6 and the metal plate 4 overlap, and to reduce the occurrence of bending stress.
- the first wiring board 2 has a fourth through hole 2c larger than the third through hole 2b on the upper surface of the first frame 2d having the third through hole 2b.
- the gap 7 is provided at a position overlapping the second frame 2e when viewed from above. According to this configuration, the gap 7 can be provided at a position overlapping the thickest portion of the first wiring board 2 when viewed from above. Therefore, when a force is applied from the upper surface of the first wiring board 2 in a process such as wire bonding or the process of mounting the lens housing 31, stress is applied so that the first wiring board 2 enters the gap 7. Bending can be suppressed. Therefore, the first wiring board is hardly deformed, and the occurrence of cracks or cracks in the first wiring board 2 can be reduced.
- the gap 7 is provided at a position overlapping the second frame 2 e when viewed from the top, and the gap 7 is formed on the inner wall of the second frame 2 e when viewed from the top. It is preferable to be provided at a position that does not overlap the position.
- the edge part of the metal plate 4 or the 2nd through-hole 6a (2nd wiring board 6) is directly under the 2nd frame 2e, and has overlapped.
- the thickness of the first wiring board 2 is thick. Therefore, since the bending stress applied from the end portion of the metal plate 4 or the second through hole 6a (second wiring substrate 6) is difficult to act on the first wiring substrate 2 having a sufficient thickness, cracks, cracks, etc. Occurrence is reduced.
- x1 is preferably about 0.1% to 25% of w1.
- an electronic element connection pad 3 is provided on the upper surface of the first wiring substrate 2, and the electronic element connection pad 3 does not overlap the gap 7 when seen from above. It is preferable to be located at.
- the metal plate 4 or the second wiring substrate 6 is provided at a position overlapping the electronic element connection pad 3 when viewed from above. Thereby, even when a force is applied to the upper surface of the first wiring board 2 when wire bonding is performed on the electronic element connection pads 3, the first wiring board 2 is bent and enters the gap 7. Application of extra force can be reduced.
- the first through hole 2a is composed of a third through hole 2b and a fourth through hole 2c.
- the first frame body 2d and the second frame body 2e may be formed from a single insulating layer as in the example shown in FIG. 4, or may be formed from two or more insulating layers, respectively. May be.
- a wiring conductor including an internal wiring and a through conductor may be provided inside the first wiring board 2 including the first frame 2d and the second frame 2e.
- the respective wiring conductors provided inside the first frame 2d and the second frame 2e forming the first wiring board 2 are the surfaces of the first frame 2d and the second frame 2e. They may be electrically connected by wiring conductors exposed to each other.
- a stepped portion is formed by the inner side surface of the second frame 2e and the upper surface of the first frame 2d, and the electronic element connection pad 3 is provided on the stepped portion. It has been.
- the connecting member 13 is made of a bonding wire
- the apex of the bonding wire can be provided low by providing the electronic element connection pad 3 at the stepped portion as described above. Therefore, it is possible to reduce the contact between the bonding wire 13 and the lid 12 in the step of sealing the electronic element mounting substrate 1 with the lid 12 and the bonding member 14.
- the electronic device 21 in the present embodiment is different from the electronic device 21 in the second embodiment in that the bonding material 15 is filled in the gap 7 between the metal plate 4 and the second wiring board 6. .
- the gap 7 between the metal plate 4 and the second wiring board 6 is filled with a bonding material 15.
- the first wiring board 2 receives a stress that causes the gap to enter the gap 7. It is possible to reduce bending. Therefore, it is possible to suppress the bending stress from being applied to the first wiring board 2 starting from the peripheral edge of the metal plate 4, and the occurrence of cracks or cracks in the first wiring board 2 can be reduced.
- the bonding material 15 by filling the gap 7 with the bonding material 15, it is possible to prevent moisture and dust from entering the gap 7. As a result, the external circuit connecting member 23 that joins the first wiring board 2 and the second wiring board 6 or the bonding material 15 at the place where the metal plate 4 and the first wiring board 2 are joined deteriorates. This can be prevented, and peeling can be reduced.
- the substance with which the gap 7 is filled is the bonding material 15 in the example shown in FIG. 5, it may be a part of the external circuit connection member 23 or another member, for example.
- an insulating resin such as a thermosetting resin can easily prevent the external circuit connection electrode 9 and the metal plate 4 from being short-circuited.
- thermosetting resin or the like bonding material 15
- a thermosetting resin is applied to the gap 7 of the electronic device 21 and reflowed and cured.
- the electronic module 30 according to this embodiment differs from the electronic device 21 according to the first embodiment in that the gap 7 between the metal plate 4 and the second wiring board 6 overlaps the lens housing 31 when viewed from the top. Is a point.
- FIG. 6 illustrates an example of an electronic module 30 (imaging module) in which a lens housing 31 is bonded to the upper surface of an electronic device 21 in which an imaging element such as a CMOS sensor is mounted as the electronic element 10.
- imaging module imaging module
- the gap 7 between the metal plate 4 and the second wiring board 6 is positioned so as to overlap with the side wall of the lens housing 31 when viewed from above.
- the electronic element connection pad 3 and the electronic component 22 are mounted in a region where the side wall is not disposed on the upper surface of the first wiring board 2.
- it can be set as the arrangement
- the first wiring board 2 is not connected to the second wiring board 6 or the metal. It will be sufficiently supported by the support of the plate 4. Therefore, it becomes difficult to apply bending stress to the first wiring board 2, and it is possible to reduce the occurrence of cracks or cracks in the first wiring board 2.
- x2 is preferably about 5 to 40% of w2.
- the electronic device 21 in the present embodiment is different from the electronic device 21 in the first embodiment in that the vertical thickness of the second wiring board 6 is larger than the vertical thickness of the metal plate 4.
- the vertical thickness of the second wiring board 6 is larger than the vertical thickness of the metal plate 4.
- the metal plate 4 is required to be thin, which is effective because the metal plate 4 is easily deformed.
- the metal plate 4 and the electronic component 10 or the first wiring board 2 are bonded with a ground potential or the like, an unintended short circuit due to contact with an external device or the like can be prevented.
- the opening of the first through hole 2a of the first wiring board 2 and the second through hole 6a of the second wiring board 6 is rectangular, but is circular. Alternatively, other polygonal shapes may be used.
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Abstract
Description
図1~図3を参照して、本発明の第1の実施形態における電子装置21、および電子素子実装用基板1について説明する。本実施形態における電子装置21は、電子素子実装用基板1と電子素子10とを備えている。
次に、本発明の第2の実施形態による電子素子実装用基板1および電子装置21について、図4を参照しつつ説明する。なお、図4に示す電子装置21は蓋体12を省略している。
次に、本発明の第3の実施形態による電子素子実装用基板1および電子装置21について、図5を参照しつつ説明する。なお、図5に示す電子装置21は蓋体12を省略している。
次に、本発明の第4の実施形態による電子素子実装用基板1および電子モジュール30について、図6を参照しつつ説明する。
次に、本発明の第5の実施形態による電子素子実装用基板1および電子装置21について、図7を参照しつつ説明する。
Claims (8)
- 内側部分を第1の貫通孔とし、下面に外部回路接続用電極を有する枠状の第1配線基板と、
該第1配線基板の下面に前記第1の貫通孔の開口を覆うように設けられた、外縁が前記第1配線基板の外縁と前記第1配線基板の内縁との間に位置し、上面の前記第1配線基板で囲まれる領域に電子素子実装部を有する板状の金属板と、
前記第1配線基板の下面のうち前記金属板の周囲領域に設けられて、前記外部回路接続用電極に電気的に接続された第2配線基板と
を有する電子素子実装用基板。 - 前記第2配線基板の上下方向の厚みは、前記金属板の上下方向の厚みと等しいことを特徴とする請求項1に記載の電子素子実装用基板。
- 前記第2配線基板は、内側部分を前記第1配線基板の前記第1の貫通孔よりも大きい第2の貫通孔とする枠状であることを特徴とする請求項1または請求項2に記載の電子素子実装用基板。
- 前記金属板の側面と前記第2配線基板の前記金属板側の側面との間には隙間が設けられていることを特徴とする請求項1乃至請求項3のいずれかに記載の電子素子実装用基板。
- 前記第1配線基板は、内側部分を第3の貫通孔とする第1の枠体と、該第1の枠体の上面に設けられた、内側部分を前記第3の貫通孔よりも大きい第4の貫通孔とする第2の枠体とから成り、前記隙間が上面透視において前記第2の枠体に重なる位置に設けられていることを特徴とする請求項4に記載の電子素子実装用基板。
- 前記第1配線基板は上面に電子素子接続用パッドを有しており、該電子素子接続用パッドが上面透視において前記隙間に重ならない位置に設けられていることを特徴とする請求項4または請求項5に記載の電子素子実装用基板。
- 前記第1配線基板と前記第2配線基板とは外部回路接続部材を介して接続され、前記第1配線基板と前記金属板とは接合材を介して接続されており、前記第2配線基板と前記外部回路接続部材との上下方向の厚みの合計は、前記金属板と前記接合材との上下方向の厚みの合計と等しいことを特徴とする請求項1乃至請求項6のいずれかに記載の電子素子実装用基板。
- 請求項1乃至請求項7のいずれかに記載の電子素子実装用基板と、
前記金属板の前記電子素子実装部に実装された電子素子とを有する電子装置。
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JP2016514874A JP6502925B2 (ja) | 2014-04-23 | 2015-04-14 | 電子素子実装用基板および電子装置 |
CN201580020428.5A CN106233456B (zh) | 2014-04-23 | 2015-04-14 | 电子元件安装用基板以及电子装置 |
US15/304,889 US9806005B2 (en) | 2014-04-23 | 2015-04-14 | Electronic element mounting substrate and electronic device |
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JP2020004901A (ja) * | 2018-06-29 | 2020-01-09 | ソニーセミコンダクタソリューションズ株式会社 | 撮像装置および撮像装置の製造方法 |
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JP6502925B2 (ja) | 2019-04-17 |
US9806005B2 (en) | 2017-10-31 |
JPWO2015163192A1 (ja) | 2017-04-13 |
US20170186672A1 (en) | 2017-06-29 |
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