WO2016121575A1 - 電子部品の製造方法および電子部品 - Google Patents
電子部品の製造方法および電子部品 Download PDFInfo
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- WO2016121575A1 WO2016121575A1 PCT/JP2016/051434 JP2016051434W WO2016121575A1 WO 2016121575 A1 WO2016121575 A1 WO 2016121575A1 JP 2016051434 W JP2016051434 W JP 2016051434W WO 2016121575 A1 WO2016121575 A1 WO 2016121575A1
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- H—ELECTRICITY
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
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- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
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- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/30—Stacked capacitors
Definitions
- the present invention relates to an electronic component manufacturing method and an electronic component.
- surface mount type electronic components such as multilayer ceramic capacitors are usually mounted on the surface of the chip body by a method such as reflow soldering. It is mounted by electrical and mechanical connection to the upper electrode.
- Patent Document 1 insulates surfaces (both end surfaces, upper surface, and both side surfaces) other than a surface (lower surface) 101a facing a mounting target such as a substrate.
- An electronic component 101 covered with a layer 130 has been proposed.
- the lower surface 101a (see FIG. 12) of the electronic component 101 is fixed to the adhesive holding jig 140 as shown in FIGS.
- the electronic component 101 is separated from the adhesive holding jig 140, so that a surface other than the lower surface of the electronic component 101 (A method for manufacturing an electronic component is shown in which both end surfaces, upper surface, and both side surfaces are covered with an insulating layer 130 and the lower surface is exposed.
- the electronic component 101 configured as described above is mounted on the mounting substrate in such a posture that its lower surface faces the mounting substrate, thereby preventing the external electrode 120 from short-circuiting with other electronic components. It is said that high-density mounting with high reliability can be performed.
- An object of the present invention is to provide an electronic component manufacturing method and an electronic component capable of manufacturing an electronic component capable of preventing a short circuit with the component.
- a method for manufacturing an electronic component according to the present invention includes: Forming an insulating layer on the external electrode body so as to cover the external electrode body formed on the chip body constituting the electronic component; The insulating layer is irradiated with laser light having a larger absorption coefficient than the material constituting the surface of the external electrode main body, and the insulating layer located in the predetermined region is removed. And a step of exposing a predetermined region of the external electrode body.
- the external electrode body is formed on the chip body, and is formed of an electrode body made of a conductive resin material, and metal plating formed so as to cover the electrode body. It is preferable that a layer is provided.
- the electrode body of the external electrode body is formed of a conductive resin material
- the electrode body made of the conductive resin material is covered with a metal plating layer that is difficult to absorb laser light.
- the electrode body (resin electrode) is not removed in the step of removing the insulating layer located in the region, and the exposed region of the external electrode body can be formed in a desired shape.
- the metal plating layer is a Ni plating layer.
- the exposed region of the external electrode body can be formed in a desired shape, and the present invention can be made more effective.
- the method for manufacturing an electronic component of the present invention further includes a step of forming a Sn plating layer so as to cover a region of the external electrode body exposed by removing the insulating layer.
- the external electrode body may be formed from a material that does not contain a resin component.
- the external electrode body formed from a material that does not include a resin component is, for example, a baked electrode (thick film electrode) formed by applying and baking a conductive paste containing metal particles and glass, a sputtering method, or vapor deposition. Examples thereof include a thin film electrode formed by a method or the like.
- the method further includes a step of forming a coating plating layer so as to cover a region exposed by removing the insulating layer of the external electrode body.
- the step of forming the coating plating layer includes a step of forming a Ni plating layer as a base layer and a step of forming a Sn plating layer as the outermost layer.
- the chip body is made of a resin material and a composite material of metal powder
- the external electrode main body includes a conductive material formed on the chip body and a metal plating layer formed so as to cover the conductive material.
- the chip body is removed in the step of irradiating the laser beam to remove the insulating layer located in a predetermined region.
- the exposed region of the external electrode body can be formed in a desired shape.
- the metal plating layer is a Cu plating layer.
- Cu is selected for the metal plating layer, so that it easily adheres to the conductive material during plating.
- the metal plating layer is composed of a Cu plating layer and a Ni plating layer formed so as to cover the Cu plating layer.
- a step of forming a Sn plating layer so as to cover a region exposed by removing the insulating layer of the external electrode main body is provided.
- a step of forming an Ni plating layer as an underlayer and an Sn plating layer as an outermost layer so as to cover an area of the external electrode body exposed by removing the insulating layer is provided.
- the Sn plating layer since the Sn plating layer is formed, it is possible to improve the bonding reliability when the electronic component is bonded to the mounting target using solder. Moreover, the Ni plating layer can prevent mutual diffusion between the Cu plating layer and the Sn plating layer.
- the insulating layer covering the region where the external electrode body of the electronic component is to be bonded directly or via a plating layer is provided. It is preferable to remove.
- the insulating layer is applied to each of the external electrode main bodies formed at both ends of the chip body. It is preferable to irradiate so as to remove a plurality of locations apart.
- bonding can be performed at a plurality of locations in each external electrode body, so that the posture during mounting of the electronic component can be stabilized.
- the material constituting the insulating layer is a resin material.
- the material constituting the insulating layer is a resin material
- the laser light is easily absorbed by the resin material, so that the present invention can be made more effective.
- a laser beam having a wavelength of 1.06 ⁇ m or more and 10.6 ⁇ m or less as the laser beam.
- the laser beam When a laser beam having a wavelength of 1.06 ⁇ m or more and 10.6 ⁇ m or less is used as the laser beam, the laser beam is easily absorbed by the resin material, and the present invention can be more effectively presented.
- the electronic component of the present invention is The chip body, An external electrode body provided on the chip body; An insulating layer covering the external electrode body so as to expose a predetermined region of the external electrode body; A coating plating layer that covers the predetermined region of the external electrode body and is exposed from the insulating layer.
- the coating plating layer covers a predetermined region of the external electrode body, the coating plating layer can be provided in a desired region. Therefore, short-circuits with other electronic components can be prevented, and highly reliable and high-density mounting can be performed. Further, since the coating plating layer covers a predetermined region of the external electrode body and is exposed from the insulating layer, the surface of the coating plating layer is not covered with the insulating layer. Therefore, when the coating plating layer of the electronic component is mounted on the mounting target with the solder, the solder does not enter between the surface of the coating plating layer and the insulating layer, and the insulating layer is not destroyed.
- the external electrode body is composed of an electrode body made of a conductive resin material provided on the chip body and a metal plating layer covering the electrode body.
- the metal plating layer can prevent mutual diffusion between the electrode body and the coating plating layer.
- the metal plating layer is a Ni plating layer
- the coating plating layer is a Sn plating layer.
- the metal plating layer is a Ni plating layer and the coating plating layer is a Sn plating layer, the metal plating layer can prevent mutual diffusion between the electrode body and the coating plating layer.
- the external electrode body is made of a material that does not contain a resin component
- the said coating plating layer is comprised from Ni plating layer and Sn plating layer which covers the said Ni plating layer.
- the external electrode body is made of a material that does not contain a resin component
- the coating plating layer is made up of a Ni plating layer and a Sn plating layer. Therefore, the Ni plating layer is composed of the external electrode body and the Sn plating layer. Mutual diffusion between the two can be prevented.
- the chip body is made of a resin material and a composite material of metal powder
- the external electrode body is composed of a conductive material provided on the chip body and a metal plating layer covering the conductive material.
- the chip body is made of a resin material and a composite material of metal powder, but a metal plating layer can be provided on the chip body via a conductive material.
- the metal plating layer is a Cu plating layer
- the said coating plating layer is comprised from Ni plating layer and Sn plating layer which covers the said Ni plating layer.
- the Ni plating layer can prevent mutual diffusion between the Cu plating layer and the Sn plating layer. Since the Ni plating layer exists between the Cu plating layer and the Sn plating layer, it is possible to prevent whiskers generated in the lamination of the Cu plating layer and the Sn plating layer.
- the metal plating layer is composed of a Cu plating layer and a Ni plating layer covering the Cu plating layer,
- the coating plating layer is a Sn plating layer.
- the Ni plating layer can prevent mutual diffusion between the Cu plating layer and the Sn plating layer. Since the Ni plating layer exists between the Cu plating layer and the Sn plating layer, it is possible to prevent whiskers generated in the lamination of the Cu plating layer and the Sn plating layer.
- the metal plating layer is composed of a Cu plating layer and a Ni plating layer covering the Cu plating layer,
- the said coating plating layer is comprised from Ni plating layer and Sn plating layer which covers the said Ni plating layer.
- the Ni plating layer can prevent mutual diffusion between the Cu plating layer and the Sn plating layer. Since the Ni plating layer exists between the Cu plating layer and the Sn plating layer, it is possible to prevent whiskers generated in the lamination of the Cu plating layer and the Sn plating layer.
- a predetermined region of the insulating layer is irradiated with laser light having a larger absorption coefficient in the insulating layer than the material constituting the surface of the electrode layer, and the insulating layer is removed.
- a desired region of the insulating layer covering the external electrode can be reliably removed.
- the exposed area of the external electrode which is the area to be bonded to the mounting target, can be formed in a desired shape, and an electronic component with high electrical and mechanical bonding reliability to the mounting target is ensured. In addition, it can be manufactured efficiently.
- the step of forming the insulating layer in the step of forming the insulating layer, it is important to form the insulating layer so that the external electrode body is covered, and the external electrode body is reliably covered.
- the surface of the chip body other than the external electrode main body may or may not be covered with the insulating layer.
- it is desirable that the surface of the chip body is also covered with an insulating layer.
- the external electrode main body is irradiated with laser light to remove the insulating layer, and after exposing a predetermined region of the external electrode main body, a metal plating layer is formed on the exposed region. It may be used as an external electrode through a step of forming the external electrode, and it may be used as an external electrode without performing a plating process after exposing a predetermined region of the external electrode body. May be.
- the coating plating layer covers a predetermined region of the external electrode main body, so that the coating plating layer can be provided in a desired region. Therefore, short-circuits with other electronic components can be prevented, and highly reliable and high-density mounting can be performed.
- FIG. 1A is a plan view
- FIG. 1A is a plan view
- FIG. 1A is a plan view
- FIG. 1B shows the manufacturing method of the electronic component concerning Embodiment 3 of this invention.
- FIG. 1A is a plan view
- FIG. 1B shows the manufacturing method of the electronic component concerning Embodiment 3 of this invention.
- FIG. 1A is a plan view
- FIG. 1B shows the manufacturing method of the electronic component concerning Embodiment 3 of this invention.
- FIG. 1A is a plan view
- FIG. is a figure which shows the manufacturing method of the electronic component concerning Embodiment 3 of this invention.
- FIG. 1A is a plan view
- FIG. shows the manufacturing method of the electronic component concerning Embodiment 3 of this invention.
- FIG. 1A is a plan view
- FIG. shows the manufacturing method of the electronic component concerning Embodiment 3 of this invention.
- FIG. 1A is a plan view
- FIG. shows the manufacturing method of the electronic component concerning Em
- FIG. 4 is a view showing another electronic component according to Embodiments 1 to 3 of the present invention, where (a) is a perspective view of an L-shaped electrode, and (b) is a perspective view of a U-shaped electrode. It is a figure which shows the conventional electronic component. It is a figure which shows the manufacturing method of the conventional electronic component.
- FIGS. 1A and 1B are views showing an electronic component 1 manufactured by the method for manufacturing an electronic component according to Embodiment 1 of the present invention.
- the electronic component 1 includes a coil 13 formed by connecting a plurality of magnetic ceramic layers 11 and a plurality of internal conductors 12 stacked via the magnetic ceramic layers 11 through via conductors (not shown).
- a pair of external electrodes 20 is disposed at both ends 10a of the chip body 10 including the two terminals 13a so as to be electrically connected to both ends 13a of the coil 13.
- the external electrode 20 is formed so as to go from the end face 10a of the chip body 10 to part of the upper surface 10b, the lower surface 10c, and both side surfaces 10d of the chip body 10.
- the electronic component 1 is entirely covered with an insulating layer 30 except for a region (lower surface region) R on the lower surface side, which is a surface of the external electrode 20 facing a circuit board to be mounted.
- the external electrode 20 is (A) An electrode body 25a formed of a resin electrode in which conductive material particles (metal particles) are dispersed in a resin, which is formed on the surface of the chip body 10 so as to be electrically connected to the coil 13, and the entire surface of the electrode body 25a are covered.
- An external electrode body 25 provided with a metal plating layer (Ni plating layer in this embodiment) 25b formed as described above,
- An Sn plating layer b1 formed so as to cover the lower surface region (exposed region) R not covered by the insulating layer 30 of the external electrode main body 25.
- the external electrode 20 exposed in the lower surface region R not covered with the insulating layer 30 (Sn plating layer constituting the surface of the external electrode) Mounting is performed by electrically and mechanically connecting b1) to a conductor (land pattern or the like) on the mounting target by a method such as reflow soldering. That is, here, the electrode body 25a formed on the chip body 10 is joined to the conductor on the mounting target via the metal plating layer (Ni plating layer) 25b and the Sn plating layer b1.
- the shape of the lower surface region R that is not covered with the insulating layer 30 of the external electrode body 25 is not particularly limited, so that the electrical and mechanical joint reliability between the electronic component 1 and the mounting target can be ensured. Any shape can be used.
- the electronic component 1 includes a chip body 10, an external electrode body 25 provided on the chip body 10, and an insulating layer that covers the external electrode body 25 so as to expose a predetermined region R of the external electrode body 25. 30 and a coating plating layer that covers a predetermined region R of the external electrode main body 25 and is exposed from the insulating layer 30.
- the coating plating layer covers the predetermined region R of the external electrode body 25, the coating plating layer can be provided in a desired region. Therefore, short circuit with other electronic components 1 can be prevented, and high-density mounting with high reliability can be performed.
- the coating plating layer covers the predetermined region R of the external electrode body 25 and is exposed from the insulating layer 30, the surface of the coating plating layer is not covered with the insulating layer 30. Therefore, when the electronic component 1 is mounted on a mounting target with solder, the solder does not enter between the surface of the coating plating layer and the insulating layer 30, and the insulating layer 30 is not destroyed. On the other hand, when at least a part of the surface of the coating plating layer is covered with the insulating layer 30, when the coating plating layer of the electronic component 1 is mounted on the mounting target by solder, There is a risk of breaking into the insulating layer 30 and destroying the insulating layer 30.
- the external electrode body 25 includes an electrode body 25a provided on the chip body 10 and made of a conductive resin material, and a metal plating layer 25b covering the electrode body 25a. Thereby, the metal plating layer 25b can prevent mutual diffusion between the electrode main body 25a and the coating plating layer.
- the metal plating layer 25b is a Ni plating layer, and the coating plating layer is a Sn plating layer b1. Thereby, the Ni plating layer can prevent mutual diffusion between the electrode body 25a (Ag metal particles) and the Sn plating layer b1.
- the chip body 10 has a substantially rectangular parallelepiped shape including both end surfaces 10a, an upper surface 10b, a lower surface 10c, and both side surfaces 10d.
- the external electrode body 25 is a five-sided electrode provided on the end face 10a, the upper face 10b, the lower face 10c, and both side faces 10d.
- the Ni plating layer (metal plating layer 25b) covers the entire electrode body 25a. Thereby, as will be described later, when the insulating layer 30 in the predetermined region R is removed by a laser, the Ni plating layer prevents damage to the electrode main body 25a by the laser.
- a Cu plating layer may be provided instead of the Ni plating layer, but the Ni plating layer is less susceptible to laser damage than the Cu plating layer.
- the electronic component removes the insulating layer in a predetermined region, as described below, a step of forming a chip body, a step of forming an external electrode body, a step of forming an insulating layer, and the like. It is manufactured through a process and a process of forming a Sn plating layer.
- a magnetic green sheet having an inner conductor pattern formed on the surface by applying a conductive paste, and an outer layer magnetic green sheet not having an inner conductor pattern are laminated and pressed in a predetermined order to form a laminated block. Then, the laminated block is cut, divided into individual chips, and then fired to form the chip body 10.
- the chip body 10 has a substantially rectangular parallelepiped shape including both end surfaces 10a, an upper surface 10b, a lower surface 10c, and both side surfaces 10d, and the corner portion and the ridge portion are chamfered by a method such as barrel polishing and has a roundness. .
- the magnetic body material which has a ferrite, a metal magnetic body, etc. as a main component can be used as a material which comprises a magnetic body green sheet.
- the electrically conductive material which has Ag, Pd, Cu etc. as a main component can be used as a material which comprises an internal conductor pattern.
- a conductive resin material is applied to both end faces 10a of the chip body 10 and cured to form the electrode body 25a.
- the conductive resin material is composed of metal particles mainly composed of Ag or Cu and a resin material.
- a plating process is performed to form a metal plating layer 25b so as to cover the electrode body 25a.
- Ni electroplating is performed to form a Ni plating layer so as to cover the surface of the electrode body 25a.
- the insulating layer 30 is formed on the entire surface of the chip body 10 including the external electrode body 25.
- the insulating layer 30 can be formed by, for example, a method of immersing the chip body 10 in an insulating material (insulating paste or the like), applying the insulating material, and then drying.
- the thickness of the insulating layer 30 is desirably 3 ⁇ m to 20 ⁇ m, for example.
- a spray coating method, an electrodeposition coating method, a drum-type rotary coating method, or the like can be used as a method for applying the insulating paste.
- a resin material having an insulating property and a material having a large laser light absorption coefficient is used as the material constituting the insulating layer 30.
- a fluorine-based resin is used as a material constituting the insulating layer 30.
- a resin material such as an epoxy resin or an acrylic resin, or a ceramic material that is an insulating material other than the resin material can be used.
- the predetermined region (lower surface region) R of the insulating layer 30 is irradiated with the laser light L to be positioned in the lower surface region R.
- the insulating layer 30 is removed. That is, the insulating layer 30 covering the external electrode body 25 in the lower surface region R is removed, and the external electrode body 25 is exposed on the lower surface 10c.
- the shape of the lower surface region R that exposes the external electrode main body 25 can be made to be a shape suitable for various mounting objects by scanning the laser light L.
- a YVO 4 laser having a wavelength of 1.06 ⁇ m is used as the type of laser that irradiates the laser beam L. Since the absorption coefficient of the YVO 4 laser light of the material constituting the surface (Ni plating layer) of the external electrode main body 25 is smaller than the absorption coefficient of the YVO 4 laser light of the insulating layer 30, insulation is performed when the laser light L is irradiated.
- the layer 30 absorbs YVO 4 laser light, but the external electrode body 25 does not absorb YVO 4 laser light and reflects most of it. As a result, the external electrode main body 25 is not removed and only the insulating layer 30 is substantially removed.
- the lower surface region R of the external electrode body 25 covered with the insulating layer 30 is exposed, and an exposed region of the external electrode body 25 is formed.
- YVO 4 YVO 4
- YAG laser, CO 2 laser, excimer laser, UV laser, etc. can be used as the type of laser.
- the metal plating layer 25b of the external electrode main body 25 is composed of only the Ni plating layer.
- an Sn plating layer is further formed so as to cover the Ni plating layer, and then the surface is insulated. It is also possible to form the layer 30. In that case, the step of forming the Sn plating layer after removing the predetermined region R of the insulating layer 30 can be omitted.
- FIGS. 3A and 3B are views showing the electronic component 1 manufactured by the method for manufacturing an electronic component according to the second embodiment of the present invention.
- the electronic component 1 is a resin electrode according to Embodiment 1 in that the external electrode body 25 is a baked electrode (thick film electrode) formed by applying and baking a conductive paste containing metal particles and glass.
- the configuration of the electronic component 1 is different from that of the electronic component 1 including the external electrode main body 25 in which the surface of the electrode main body 25a is coated with a Ni plating layer.
- the electronic component according to the second embodiment will be described.
- the circuit board on which the external electrode 20 is mounted, etc. as in the case of the electronic component of the first embodiment described above.
- the entire surface is covered with an insulating layer 30 except for a lower surface side region (lower surface region) R which is a surface opposite to the surface. That is, in the electronic component 1 of the second embodiment, the chip body 10 including the external electrode body 25 that is a baked electrode (thick film electrode) is directly covered with the insulating layer 30.
- the electronic component 1 is entirely covered with an insulating layer 30 except for a region (lower surface region) R on the lower surface side, which is a surface of the external electrode 20 facing a circuit board to be mounted.
- the external electrode 20 includes a Ni plating layer c1 that is a base layer directly formed on the surface of the external electrode body 25 in a lower surface region (exposed region) R that is not covered with the insulating layer 30, and a Ni plating layer c1. Is provided with an Sn plating layer c2 formed as the outermost layer.
- Other configurations are the same as those of the electronic component 1 of the first embodiment.
- the external electrode body 25 is made of a material that does not contain a resin component, as compared with the electronic component of the first embodiment, and the coating plating layer includes the Ni plating layer c1. And an Sn plating layer c2 covering the Ni plating layer c1.
- the Ni plating layer c1 can prevent mutual diffusion between the external electrode main body 25 (Ag baking electrode) and the Sn plating layer c2.
- the Ni plating layer c1 can improve mountability by making a NiSn alloy.
- the Ni plating layer c1 covers only the predetermined region R of the external electrode main body 25 exposed from the insulating layer 30. That is, since the external electrode body 25 is a baked electrode that does not contain a resin component, the resin component of the external electrode body 25 does not fly when the insulating layer 30 in the predetermined region R is removed by a laser. Thereby, the Ni plating layer c1 can be provided only in the predetermined region R, not the entire external electrode body 25.
- the external electrode main body 25 is formed by applying and baking a conductive paste containing metal particles mainly composed of Ag or Cu and glass on both end faces 10a of the chip body 10.
- the external electrode main body 25 of Embodiment 2 is a baked electrode (thick film electrode) formed by applying and baking a conductive paste, and does not include a resin component.
- the external electrode main body 25 which does not contain a resin component can be formed by other methods such as a sputtering method or a vapor deposition method in addition to the method of applying and baking the conductive paste described above.
- the insulating layer 30 is formed on the entire surface of the chip body 10 including the external electrode body 25.
- a resin material having a large absorption coefficient of the laser light L is used as in the first embodiment.
- a predetermined region (lower surface region) R of the insulating layer 30 is irradiated with laser light L, and the insulating layer 30 located in the lower surface region R is removed. That is, the insulating layer 30 covering the external electrode body 25 in the lower surface region R is removed, and the external electrode body 25 is exposed on the lower surface 10c.
- a Ni plating layer c1 is formed as a base layer on the surface of the external electrode body 25 exposed in the lower surface region R, and an Sn plating layer is formed as the outermost layer on the surface of the Ni plating layer c1.
- c2 is formed.
- FIGS. 5A and 5B are views showing an electronic component 1 manufactured by the method for manufacturing an electronic component according to Embodiment 3 of the present invention.
- the third embodiment is different from the second embodiment in the configuration of the chip body and the external electrode body. This different configuration will be described below. Since other structures are the same as those of the second embodiment, description thereof is omitted.
- the chip body 10 is made of a resin material and a composite material of metal powder.
- the resin material is an organic insulating material made of, for example, an epoxy resin, bismaleimide, liquid crystal polymer, polyimide, or the like.
- the metal powder is, for example, an FeSi alloy such as FeSiCr, an FeCo alloy, an Fe alloy such as NiFe, or an amorphous alloy thereof.
- the external electrode main body 25 includes a conductive material 40 provided on the chip body 10 and a metal plating layer 50 covering the conductive material 40.
- the conductive material 40 is a material that can be attached to the chip body 10 to impart conductivity, and examples thereof include transition metal ions, colloids containing them, conductive polymers, and graphite.
- the conductive material 40 is at least one metal selected from the group consisting of palladium, tin, silver, and copper.
- the metal plating layer 50 is a Cu plating layer.
- the coating plating layer includes a Ni plating layer c1 and a Sn plating layer c2 that covers the Ni plating layer c1.
- the Ni plating layer c1 can prevent mutual diffusion between the Cu plating layer and the Sn plating layer c2. Since the Ni plating layer c1 exists between the Cu plating layer and the Sn plating layer c2, whiskers generated in the lamination of the Cu plating layer and the Sn plating layer c2 can be prevented. Further, the chip body 10 is made of a composite material of a resin material and a metal powder, but the metal plating layer 50 can be provided on the chip body 10 via a conductive material.
- a part of the chip body 10 is covered with a mask 200 so that both end faces 10 a of the chip body 10 are exposed.
- a conductive material 40 is formed on the both end surfaces 10 a side of the chip body 10.
- the conductive solution is attached to both ends of the chip body 10, and the conductive properties are applied to both ends of the chip body 10. Material 40 is formed.
- the mask 200 has a plurality of rectangular holes 200a, and the holes 200a are arranged in a matrix.
- the mask 200 has a structure in which a core material 201 made of stainless steel is covered with a rubber 202 as shown in FIG. And each hole 200a is provided so that one main body 10 may be accommodated.
- the size of the hole 200 a is smaller than that of the chip body 10.
- the chip body 10 imparted with conductivity by the adhesion of the conductive material 40 is extracted from the mask 200. Then, the chip body 10 is immersed in a plating bath and subjected to electrolytic plating, and a metal plating layer 50 is formed at the end of the chip body 10 to which the conductive material 40 adheres, as shown in FIG.
- the metal plating layer 50 is formed so as to cover the conductive material 40.
- the metal plating layer 50 is a Cu plating layer. Therefore, since the metal plating layer 50 selects Cu, the metal plating layer 50 is likely to adhere to the conductive material 40 by plating during plating. In this way, the external electrode body 25 is formed from the conductive material 40 and the metal plating layer 50.
- the insulating layer 30 is formed on the entire surface of the chip body 10 including the external electrode body 25.
- a resin material having a large absorption coefficient of the laser light L is used as in the first embodiment.
- a predetermined region (lower surface region) R of the insulating layer 30 is irradiated with laser light L, and the insulating layer 30 located in the lower surface region R is removed. That is, the insulating layer 30 covering the external electrode body 25 in the lower surface region R is removed, and the external electrode body 25 is exposed on the lower surface 10c. Therefore, since the resin material of the chip body 10 is covered with the metal plating layer 50 that is difficult to absorb the laser beam, the step of removing the insulating layer 30 located in the predetermined region R by irradiating the laser beam, The resin material of the chip body 10 is not removed, and the exposed region of the external electrode body 25 can be formed in a desired shape.
- a Ni plating layer c1 is formed as a base layer on the surface of the external electrode body 25 exposed in the lower surface region R, and an Sn plating layer is formed as the outermost layer on the surface of the Ni plating layer c1.
- c2 is formed. Therefore, since the Sn plating layer c2 is formed, it is possible to improve the bonding reliability when the electronic component 1 is bonded to a mounting target using solder. Further, the Ni plating layer c1 can prevent mutual diffusion between the Cu plating layer and the Sn plating layer c2.
- the Ni plating layer c1 exists between the Cu plating layer and the Sn plating layer c2, whiskers generated in the lamination of the Cu plating layer and the Sn plating layer c2 can be prevented. Thereby, the electronic component 1 having a structure as shown in FIG. 5 is obtained.
- the metal plating layer 50 is comprised from the Cu plating layer 51 and the Ni plating layer 52 which covers the Cu plating layer 51, and a coating plating layer is Sn plating layer b1.
- the Ni plating layer 52 covers the entire Cu plating layer 51, but may cover a portion corresponding to a predetermined region R of the Cu plating layer 51. Therefore, the Ni plating layer 52 can prevent mutual diffusion between the Cu plating layer 51 and the Sn plating layer b1.
- the metal plating layer 50 includes a Cu plating layer 51 and a Ni plating layer 52 formed so as to cover the Cu plating layer 51. Thereby, the Cu plating layer 51 is easily attached to the conductive material 40 by plating, and the Ni plating layer 52 protects the Cu plating layer 51.
- the metal plating layer 50 includes a Cu plating layer 51 and a Ni plating layer 52 formed so as to cover the Cu plating layer 51.
- the Sn plating layer b1 is formed so as to cover the region exposed by removing the insulating layer of the external electrode body.
- Sn plating layer b1 is formed, when electronic component 1 is joined to a mounting object using solder, it becomes possible to improve joint reliability.
- the metal plating layer 50 is composed of a Cu plating layer 51 and a Ni plating layer 52 covering the Cu plating layer 51, and the coating plating layer includes a Ni plating layer c1 and a Ni plating layer. And an Sn plating layer c2 covering the layer c1. Therefore, the Ni plating layers 52 and c1 can prevent mutual diffusion between the Cu plating layer 51 and the Sn plating layer c2.
- the metal plating layer 50 includes a Cu plating layer 51 and a Ni plating layer 52 formed so as to cover the Cu plating layer 51.
- the region (lower surface region) R from which the insulating layer 30 is removed is one each on one side and the other side of the pair of external electrodes 20 (that is, a total of two).
- a plurality (two in FIG. 10B) are formed in the lower surface region R of one partial electrode 20, and the other external electrode is formed.
- a plurality (two in FIG. 10B) may also be formed in the lower surface region R of 20. That is, the laser light is respectively applied to a plurality of locations (two or more locations) of the insulating layer covering one external electrode body and a plurality of locations (two locations or more) of the insulating layer covering the other external electrode body.
- the insulating layer may be removed by irradiating at a distance. The same applies to the second and third embodiments.
- the external electrode body 25 is a five-surface electrode provided on the end surface 10a, the upper surface 10b, the lower surface 10c, and both side surfaces 10d. As shown in FIG.
- the external electrode main body 25 may be an L-shaped electrode provided on the end surface 10a and the lower surface 10c, or as shown in FIG. 11B, the external electrode main body 25 includes the end surface 10a, the upper surface 10b, and A U-shaped electrode provided on the lower surface 10c may be used.
- the insulating layer 30 on the lower surface 10c side of the chip body 10 is removed, but the insulating layer 30 on the end surface 10a side can also be removed.
- the insulating layer 30 on the end surface 10a side can also be removed. For example, by exposing a part of the external electrode 20 on the end surface 10a side, when the electronic component 1 is mounted on the mounting target, a region that can be joined also to the external electrode 20 on the end surface 10a side is formed. It is possible to improve the bonding reliability.
- a multilayer inductor has been described as an example.
- the present invention is not limited to a multilayer capacitor, a multilayer thermistor, a multilayer LC composite component, and a wound coil component wound with a conductive wire. It can be applied to various electronic components such as a noise filter.
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Abstract
Description
そして、特許文献1には、電子部品101の製造方法として、図13(a)~(c)に示すように、電子部品101の下面101a(図12参照)を粘着性保持治具140に固定し、外部電極120およびチップ素体110の表面に絶縁性樹脂130aを塗布し固化させた後、電子部品101を粘着性保持治具140から分離することで、電子部品101の下面以外の面(両端面、上面および両側面)を絶縁層130で覆うとともに、下面を露出させるようにした電子部品の製造方法が示されている。
そして、このように構成された電子部品101は、その下面が実装基板と対向するような姿勢で実装基板上に搭載することにより、外部電極120が他の電子部品などとショートすることを防止して、信頼性の高い、高密度実装を行うことができるとされている。
電子部品を構成するチップ素体上に形成された外部電極本体が被覆されるように、前記外部電極本体上に絶縁層を形成する工程と、
前記外部電極本体の表面を構成する材料よりも前記絶縁層の方が吸収係数の大きいレーザ光を、前記絶縁層の所定の領域に照射して、前記所定の領域に位置する前記絶縁層を除去し、前記外部電極本体の所定の領域を露出させる工程と
を具備することを特徴としている。
樹脂成分を含まない材料から形成された外部電極本体とは、例えば、金属粒子とガラスを含む導電性ペーストを塗布、焼成することにより形成される焼付け電極(厚膜電極)や、スパッタ法や蒸着法などにより形成される薄膜電極などが例示される。
前記外部電極本体は、前記チップ素体上に形成された導電性材料と、前記導電性材料を被覆するように形成された金属めっき層とから構成される。
チップ素体と、
前記チップ素体上に設けられた外部電極本体と、
前記外部電極本体の所定の領域を露出させるように前記外部電極本体を覆う絶縁層と、
前記外部電極本体の前記所定の領域を覆って、前記絶縁層から露出している被覆めっき層と
を備える。
また、被覆めっき層は、外部電極本体の所定の領域を覆って、絶縁層から露出しているので、被覆めっき層の表面は、絶縁層に覆われていない。したがって、電子部品の被覆めっき層をはんだにより実装対象に実装させるとき、はんだが、被覆めっき層の表面と絶縁層との間に入り込むことがなく、絶縁層を破壊しない。
これに対して、被覆めっき層の表面の少なくとも一部を、絶縁層にて覆うと、電子部品の被覆めっき層をはんだにより実装対象に実装させるとき、はんだが、被覆めっき層の表面と絶縁層との間に入り込んで、絶縁層を破壊するおそれがある。
前記被覆めっき層は、Niめっき層と、前記Niめっき層を覆うSnめっき層とから構成される。
前記外部電極本体は、前記チップ素体上に設けられた導電性材料と、前記導電性材料を覆う金属めっき層とから構成される。
前記被覆めっき層は、Niめっき層と、前記Niめっき層を覆うSnめっき層とから構成される。
前記被覆めっき層は、Snめっき層である。
前記被覆めっき層は、Niめっき層と、前記Niめっき層を覆うSnめっき層とから構成される。
その結果、実装対象に接合される領域となる外部電極の露出領域を、所望の形状に形成することが可能になり、実装対象との電気的、機械的な接合信頼性の高い電子部品を確実に、しかも効率よく製造することができるようになる。
図1(a),(b)は、本発明の実施形態1にかかる電子部品の製造方法により作製される電子部品1を示す図である。
外部電極20は、チップ素体10の端面10aからチップ素体10の上面10b、下面10cおよび両側面10dの一部に回り込むように形成されている。
また、電子部品1は、外部電極20の、実装対象である回路基板などと対向する面である下面側の領域(下面領域)Rを除いて、全体が絶縁層30で覆われている。
(a)コイル13と導通するようにチップ素体10の表面に形成された、導電材料粒子(金属粒子)が樹脂に分散した樹脂電極からなる電極本体25aと、電極本体25aの表面全体を覆うように形成された金属めっき層(この実施形態ではNiめっき層)25bとを備えた外部電極本体25と、
(b)外部電極本体25の上記絶縁層30により覆われていない下面領域(露出領域)Rを被覆するように形成されたSnめっき層b1とを備えている。
すなわち、ここでは、チップ素体10上に形成された電極本体25aが、金属めっき層(Niめっき層)25b、Snめっき層b1を介して実装対象上の導体に接合される。なお、外部電極本体25の絶縁層30により被覆されていない下面領域Rの形状には、特別の制約はなく、電子部品1と実装対象との電気的、機械的な接合信頼性が確保できるような形状であればよい。
上記構成では、被覆めっき層は、外部電極本体25の所定の領域Rを覆っているので、被覆めっき層を所望の領域に設けることができる。したがって、他の電子部品1などとのショートを防止でき、信頼性の高い、高密度実装を行うことができる。
また、被覆めっき層は、外部電極本体25の所定の領域Rを覆って、絶縁層30から露出しているので、被覆めっき層の表面は、絶縁層30に覆われていない。したがって、電子部品1をはんだにより実装対象に実装させるとき、はんだが、被覆めっき層の表面と絶縁層30との間に入り込むことがなく、絶縁層30を破壊しない。
これに対して、被覆めっき層の表面の少なくとも一部を、絶縁層30にて覆うと、電子部品1の被覆めっき層をはんだにより実装対象に実装させるとき、はんだが、被覆めっき層の表面と絶縁層30との間に入り込んで、絶縁層30を破壊するおそれがある。
なお、この実施形態では、電子部品は、以下に説明するような、チップ素体を形成する工程、外部電極本体を形成する工程、絶縁層を形成する工程、所定の領域の絶縁層を除去する工程、Snめっき層を形成する工程を経て製造される。
まず、導電性ペーストを塗布することにより形成された内部導体パターンを表面に備えた磁性体グリーンシート、および、内部導体パターンを備えていない外層用の磁性体グリーンシートを、所定の順序で積層、圧着することで積層ブロックを形成する。そしてこの積層ブロックをカットして、個々のチップに分割した後、焼成することにより、チップ素体10を形成する。
チップ素体10は、両端面10a、上面10b、下面10cおよび両側面10dからなる略直方体形状をしており、コーナー部および稜部がバレル研磨などの方法で面取りされ、丸みを有している。
次に、チップ素体10の両端面10aに導電性樹脂材料を塗布し、硬化させることにより電極本体25aを形成する。導電性樹脂材料は、AgまたはCuを主成分とする金属粒子と樹脂材料とにより構成されている。
次に、めっき処理を行い、電極本体25aを被覆するように金属めっき層25bを形成する。具体的には、Ni電解めっきを行って、電極本体25aの表面を覆うようにNiめっき層を形成する。なお、Ni電解めっきの前に、無電解めっきなどにより、下地となるめっき層を形成してもよい。
次に、図2(b)に示すように、外部電極本体25を含むチップ素体10の表面全体に絶縁層30を形成する。絶縁層30は、例えば、チップ素体10を絶縁材料(絶縁性ペーストなど)に浸漬する方法で、絶縁材料を塗布した後、乾燥させることにより形成することができる。
絶縁層30の厚みは、例えば、3μm~20μmとすることが望ましい。絶縁性ペーストを塗布する方法としては、スプレー塗布法、電着塗装法、ドラム式回転コーティング法などを用いることも可能である。
次に、図2(c)に示すように、絶縁層30の所定の領域(下面領域)Rにレーザ光Lを照射して、下面領域Rに位置する絶縁層30を除去する。すなわち、下面領域Rにおいて外部電極本体25を被覆している絶縁層30を除去し、下面10cに外部電極本体25を露出させる。
外部電極本体25を露出させる下面領域Rの形状は、レーザ光Lを走査させることで、種々の実装対象に適合した形状とすることができる。
このレーザ光Lの照射によって、絶縁層30に被覆されていた外部電極本体25の下面領域Rが露出し、外部電極本体25の露出領域が形成される。
なお、レーザの種類としては、YVO4以外にも、YAGレーザ、CO2レーザ、エキシマレーザ、UVレーザなどを用いることが可能である。
それから、図2(d)に示すように、下面領域Rに露出した外部電極本体25(Niめっき層)上に、Snめっき層b1を形成する。
これにより、図1に示すような構造を有する電子部品1が得られる。
図3(a),(b)は、本発明の実施形態2にかかる電子部品の製造方法により作製される電子部品1を示す図である。電子部品1は、外部電極本体25が、金属粒子とガラスを含む導電性ペーストを塗布、焼成することで形成された焼付け電極(厚膜電極)である点において、上記実施形態1の、樹脂電極からなる電極本体25aの表面をNiめっき層で被覆した外部電極本体25を備えた電子部品1とは、その構成を異にしている。
図3(a),(b)に示すように、この実施形態2の電子部品1も、上述の実施形態1の電子部品の場合と同様に、外部電極20の、実装対象である回路基板などと対向する面である下面側の領域(下面領域)Rを除いて、全体が絶縁層30で覆われている。
すなわち、実施形態2の電子部品1においては、焼付け電極(厚膜電極)である外部電極本体25を備えたチップ素体10が、絶縁層30により直接に被覆されている。
また、電子部品1は、外部電極20の、実装対象である回路基板などと対向する面である下面側の領域(下面領域)Rを除いて、全体が絶縁層30で覆われている。
また、外部電極20は、上記絶縁層30により覆われていない下面領域(露出領域)Rに、外部電極本体25の表面に直接形成された下地層であるNiめっき層c1と、Niめっき層c1の表面に最外層として形成されたSnめっき層c2を備えている。
その他の構成は、上記実施形態1の電子部品1と場合と同様である。
なお、樹脂成分を含まない外部電極本体25は、上述の導電性ペーストを塗布、焼成する方法以外にも、例えば、スパッタ法や蒸着法などの他の方法によっても形成することができる。
なお、絶縁層30を構成する材料としては、実施形態1と同様に、レーザ光Lの吸収係数が大きい樹脂材料が用いられる。
これにより、図3に示すような構造を有する電子部品1が得られる。
図5(a),(b)は、本発明の実施形態3にかかる電子部品の製造方法により作製される電子部品1を示す図である。実施形態3は、実施形態2とは、チップ素体および外部電極本体の構成が相違する。この相違する構成を以下に説明する。なお、その他の構造は、実施形態2と同じであるため、その説明を省略する。
金属めっき層50は、Cuめっき層である。被覆めっき層は、Niめっき層c1と、Niめっき層c1を覆うSnめっき層c2とから構成される。
これにより、Niめっき層c1は、Cuめっき層とSnめっき層c2との間の相互拡散を防止できる。Niめっき層c1は、Cuめっき層とSnめっき層c2との間に存在するので、Cuめっき層とSnめっき層c2との積層で発生するウィスカを防止できる。
また、チップ素体10は樹脂材料および金属粉のコンポジット材料からなるが、チップ素体10に導電性材料を介して金属めっき層50を設けることができる。
そして、チップ素体10を孔200aに挿入する際には、棒状の部材でマスク200の一面側から、チップ素体10を孔200に押し込む。これにより、チップ素体10の両端部を孔200aから露出することができる。なお、チップ素体10の一方の端部を孔200aから露出させるようにしてもよい。
金属めっき層50は、Cuめっき層である。したがって、金属めっき層50は、Cuを選択しているため、めっきの際に、めっきにより、導電性材料40に付着しやすくなる。
このようにして、導電性材料40と金属めっき層50とから、外部電極本体25を形成する。
なお、絶縁層30を構成する材料としては、実施形態1と同様に、レーザ光Lの吸収係数が大きい樹脂材料が用いられる。
したがって、チップ素体10の樹脂材料が、レーザ光が吸収されにくい金属めっき層50により被覆されているので、レーザ光を照射して所定の領域Rに位置する絶縁層30を除去する工程で、チップ素体10の樹脂材料が除去されてしまうことがなく、外部電極本体25の露出領域を所望の形状とすることができる。
したがって、Snめっき層c2を形成するので、電子部品1を、はんだを用いて実装対象に接合する場合に、接合信頼性を向上させることが可能になる。また、Niめっき層c1は、Cuめっき層とSnめっき層c2との間の相互拡散を防止できる。また、Niめっき層c1は、Cuめっき層とSnめっき層c2との間に存在するので、Cuめっき層とSnめっき層c2との積層で発生するウィスカを防止できる。
これにより、図5に示すような構造を有する電子部品1が得られる。
図9(a)に示すように、金属めっき層50は、Cuめっき層51と、Cuめっき層51を覆うNiめっき層52とから構成され、被覆めっき層は、Snめっき層b1である。なお、金属めっき層50において、Niめっき層52は、Cuめっき層51の全体を覆っているが、Cuめっき層51の所定の領域Rに対応する部分を覆うようにしてもよい。
したがって、Niめっき層52は、Cuめっき層51とSnめっき層b1との間の相互拡散を防止できる。Niめっき層52は、Cuめっき層51とSnめっき層b1との間に存在するので、Cuめっき層51とSnめっき層b1との積層で発生するウィスカを防止できる。
この電子部品1の製造方法を説明する。図8に示す電子部品1の製造方法と異なる方法を説明する。
図8(a)において、金属めっき層50を、Cuめっき層51と、Cuめっき層51を覆うように形成されたNiめっき層52とから構成する。これにより、Cuめっき層51は、めっきにより、導電性材料40に付着しやすくなり、また、Niめっき層52は、Cuめっき層51を保護する。
図8(d)において、外部電極本体の、絶縁層を除去することで露出した領域を被覆するように、Snめっき層b1を形成する。このように、Snめっき層b1を形成するので、電子部品1を、はんだを用いて実装対象に接合する場合に、接合信頼性を向上させることが可能になる。
図9(b)に示すように、金属めっき層50は、Cuめっき層51と、Cuめっき層51を覆うNiめっき層52とから構成され、被覆めっき層は、Niめっき層c1と、Niめっき層c1を覆うSnめっき層c2とから構成される。
したがって、Niめっき層52,c1は、Cuめっき層51とSnめっき層c2との間の相互拡散を防止できる。Niめっき層52,c1は、Cuめっき層51とSnめっき層c2との間に存在するので、Cuめっき層51とSnめっき層c2との積層で発生するウィスカを防止できる。
この電子部品1の製造方法を説明する。図8に示す電子部品1の製造方法と異なる方法を説明する。
図8(a)において、金属めっき層50を、Cuめっき層51と、Cuめっき層51を覆うように形成されたNiめっき層52とから構成する。これにより、Cuめっき層51は、Cuを選択しているため、めっきの際に、導電性材料40に付着しやすくなり、また、Niめっき層52は、Cuめっき層51を保護する。その後、図8(b)~(d)にて説明した方法と同じ方法を行う。
ここで、図8(c)を参照して、外部電極本体25の所定の領域Rを露出させるように所定の領域Rに対応する絶縁層30をレーザ光で除去するとき、金属めっき層50のNiめっき層52は、レーザ光の熱で酸化する。そこで、この方法では、図8(d)を参照して、被覆めっき層のNiめっき層c1を再度施してから、Snめっき層c2を行っている。
すなわち、レーザ光を、一方の外部電極本体を被覆している絶縁層の複数箇所(2箇所以上)と他方の外部電極本体を被覆している絶縁層の複数箇所(2箇所以上)に、それぞれ離間して照射し、絶縁層を除去するようにしてもよい。なお、実施形態2,3についても同様である。
例えば、外部電極20の端面10a側の一部を露出させることにより、電子部品1を実装対象に搭載した場合に、端面10a側の外部電極20にも接合可能な領域が形成され、実装対象との接合信頼性を向上させることができる。
10 チップ素体
10a チップ素体の端面
10b チップ素体の上面
10c チップ素体の下面
10d チップ素体の側面
11 磁性体セラミック層
12 内部導体
13 コイル
13a コイルの端部
20 外部電極
25 外部電極本体
25a 電極本体
25b 金属めっき層
30 絶縁層
40 導電性材料
50 金属めっき層
51 Cuめっき層
52 Niめっき層
b1 (被覆めっき層の一例の)Snめっき層
c1 (被覆めっき層の一例の)Niめっき層(下地層)
c2 (被覆めっき層の一例の)Snめっき層(最外層)
L レーザ光
R 所定の領域(絶縁層を除去する領域)
Claims (24)
- 電子部品を構成するチップ素体上に形成された外部電極本体が被覆されるように、前記外部電極本体上に絶縁層を形成する工程と、
前記外部電極本体の表面を構成する材料よりも前記絶縁層の方が吸収係数の大きいレーザ光を、前記絶縁層の所定の領域に照射して、前記所定の領域に位置する前記絶縁層を除去し、前記外部電極本体の所定の領域を露出させる工程と
を具備する、電子部品の製造方法。 - 前記外部電極本体が、前記チップ素体上に形成された、導電性樹脂材料からなる電極本体と、前記電極本体を被覆するように形成された金属めっき層とを備えたものである、請求項1記載の電子部品の製造方法。
- 前記金属めっき層が、Niめっき層である、請求項2記載の電子部品の製造方法。
- 前記外部電極本体の、前記絶縁層を除去することで露出した領域を被覆するように、Snめっき層を形成する工程を備えている、請求項2または3記載の電子部品の製造方法。
- 前記外部電極本体が、樹脂成分を含まない材料から形成されたものである、請求項1記載の電子部品の製造方法。
- 前記外部電極本体の、前記絶縁層を除去することで露出した領域を被覆するように、被覆めっき層を形成する工程を備えている、請求項5記載の電子部品の製造方法。
- 前記被覆めっき層を形成する工程が、下地層としてNiめっき層を形成する工程と、最外層としてSnめっき層を形成する工程を備えている、請求項6記載の電子部品の製造方法。
- 前記チップ素体は、樹脂材料および金属粉のコンポジット材料からなり、
前記外部電極本体は、前記チップ素体上に形成された導電性材料と、前記導電性材料を被覆するように形成された金属めっき層とから構成される、請求項1記載の電子部品の製造方法。 - 前記金属めっき層は、Cuめっき層である、請求項8記載の電子部品の製造方法。
- 前記金属めっき層は、Cuめっき層と、前記Cuめっき層を覆うように形成されたNiめっき層とから構成される、請求項8記載の電子部品の製造方法。
- 前記外部電極本体の、前記絶縁層を除去することで露出した領域を被覆するように、Snめっき層を形成する工程を備えている、請求項10記載の電子部品の製造方法。
- 前記外部電極本体の、前記絶縁層を除去することで露出した領域を被覆するように、下地層としてNiめっき層と最外層としてSnめっき層とを形成する工程を備えている、請求項9または10記載の電子部品の製造方法。
- 前記レーザ光の照射により、前記電子部品を実装対象上に搭載する場合において、前記電子部品の前記外部電極本体が直接またはめっき層を介して接合されるべき領域を被覆している前記絶縁層を除去する、請求項1~12のいずれか一つに記載の電子部品の製造方法。
- 前記チップ素体の両端部のそれぞれに前記外部電極本体が形成されている場合において、前記レーザ光を、前記チップ素体の両端部に形成された前記外部電極本体それぞれについて、前記絶縁層の複数箇所を離間して除去するように照射する、請求項13記載の電子部品の製造方法。
- 前記絶縁層を構成する材料が、樹脂材料である、請求項1~14のいずれか一つに記載の電子部品の製造方法。
- 前記レーザ光として、波長が1.06μm以上、10.6μm以下のレーザ光を用いる、請求項15記載の電子部品の製造方法。
- チップ素体と、
前記チップ素体上に設けられた外部電極本体と、
前記外部電極本体の所定の領域を露出させるように前記外部電極本体を覆う絶縁層と、
前記外部電極本体の前記所定の領域を覆って、前記絶縁層から露出している被覆めっき層と
を備える、電子部品。 - 前記外部電極本体は、前記チップ素体上に設けられ導電性樹脂材料からなる電極本体と、前記電極本体を覆う金属めっき層とから構成される、請求項17記載の電子部品。
- 前記金属めっき層は、Niめっき層であり、前記被覆めっき層は、Snめっき層である、請求項18記載の電子部品。
- 前記外部電極本体は、樹脂成分を含まない材料から構成され、
前記被覆めっき層は、Niめっき層と、前記Niめっき層を覆うSnめっき層とから構成される、請求項17記載の電子部品。 - 前記チップ素体は、樹脂材料および金属粉のコンポジット材料からなり、
前記外部電極本体は、前記チップ素体上に設けられた導電性材料と、前記導電性材料を覆う金属めっき層とから構成される、請求項17記載の電子部品。 - 前記金属めっき層は、Cuめっき層であり、
前記被覆めっき層は、Niめっき層と、前記Niめっき層を覆うSnめっき層とから構成される、請求項21記載の電子部品。 - 前記金属めっき層は、Cuめっき層と、前記Cuめっき層を覆うNiめっき層とから構成され、
前記被覆めっき層は、Snめっき層である、請求項21記載の電子部品。 - 前記金属めっき層は、Cuめっき層と、前記Cuめっき層を覆うNiめっき層とから構成され、
前記被覆めっき層は、Niめっき層と、前記Niめっき層を覆うSnめっき層とから構成される、請求項21記載の電子部品。
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Also Published As
| Publication number | Publication date |
|---|---|
| US11170935B2 (en) | 2021-11-09 |
| JP6547762B2 (ja) | 2019-07-24 |
| CN107210129B (zh) | 2020-03-10 |
| KR20170102919A (ko) | 2017-09-12 |
| JPWO2016121575A1 (ja) | 2017-10-19 |
| TW201628470A (zh) | 2016-08-01 |
| US20170323725A1 (en) | 2017-11-09 |
| KR101975133B1 (ko) | 2019-05-03 |
| TWI610602B (zh) | 2018-01-01 |
| CN107210129A (zh) | 2017-09-26 |
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