WO2016092956A1 - 発光装置用基板及び発光装置用基板の製造方法 - Google Patents
発光装置用基板及び発光装置用基板の製造方法 Download PDFInfo
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- WO2016092956A1 WO2016092956A1 PCT/JP2015/079570 JP2015079570W WO2016092956A1 WO 2016092956 A1 WO2016092956 A1 WO 2016092956A1 JP 2015079570 W JP2015079570 W JP 2015079570W WO 2016092956 A1 WO2016092956 A1 WO 2016092956A1
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- layer
- metal
- metal layer
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- light emitting
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
- F21V21/002—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips making direct electrical contact, e.g. by piercing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/06—Arrangement of electric circuit elements in or on lighting devices the elements being coupling devices, e.g. connectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/10—Construction
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/58—Optical field-shaping elements
- H01L33/60—Reflective elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/62—Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/64—Heat extraction or cooling elements
- H01L33/644—Heat extraction or cooling elements in intimate contact or integrated with parts of the device other than the semiconductor body
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2105/00—Planar light sources
- F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
- H01L2224/161—Disposition
- H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the present invention relates to a substrate for a light emitting device in which a ceramic layer and an electrode pattern are formed on a metal substrate, in particular, a substrate structure of a substrate for a light emitting device that is used in a lighting device and directly mounts a light emitting element on the electrode pattern,
- the present invention relates to a light emitting device using a light emitting device substrate, a lighting device, and a method for manufacturing the light emitting device substrate.
- an electrode pattern on an insulating substrate for example, in a printed circuit board, it is common to form an electrode pattern by etching after a copper foil is attached to a base via an adhesive layer. Further, in a ceramic substrate, it is common to form an electrode pattern by electrolytic plating after printing a conductive pattern that becomes the base of an electrode with a conductive paste.
- Patent Documents 1 and 2 disclose a method of forming an electrode pattern by forming a thick Cu film by electrolytic plating on a seed metal using the metal thin film as a seed metal.
- Japanese Patent Publication Japanese Patent Laid-Open No. 2011-96743 (published on May 12, 2011)” Japanese Patent Publication “JP 2013-102046 A (published May 23, 2013)”
- the light emitting element passes through the electrode pattern, the ceramic layer, the metal substrate, and the heat sink. Every route is the main heat dissipation route.
- a layer having a low thermal conductivity of an adhesive or a conductive paste is interposed between the ceramic layer and the electrode pattern.
- the portion where the electrode pattern is formed is in the vicinity of the light emitting element in the main heat dissipation path, there is a problem that the contribution rate to the substrate thermal resistance is high and the thermal resistance of the entire substrate is increased. It was. As a result, there arises a problem that the temperature of the solder joint used for connecting the light emitting element and the light emitting element to the electrode terminal becomes high.
- the alumite layer is cracked after a high temperature manufacturing process, for example, exceeding 200 ° C. It falls and does not function as an insulating layer.
- a high temperature manufacturing process for example, exceeding 200 ° C. It falls and does not function as an insulating layer.
- Widely used in flip-chip type light emitting devices even if the solder joints become hot, even if the light emitting device is mounted on the electrode pattern using stable AuSn eutectic solder, it is passed through a high temperature furnace in the reflow process The substrate temperature exceeds 300 ° C. For this reason, the board
- alumite obtained by anodic oxidation is generally as thin as 10 ⁇ m or less and at most several tens of ⁇ m, and ensures high electrical withstand voltage performance required for high-luminance lighting substrates, for example, exceeding 4 kV. It is difficult.
- the adhesion between copper and alumite is low, and in particular, the adhesion between anodized alumite and copper is low. Since alumite does not function as an insulating layer as it is, a sealing treatment is indispensable for use as an insulating layer, but a copper electrode pattern formed on such an insulating layer is necessarily easily peeled off.
- anodized is a porous film
- the base aluminum and the electrode pattern are in electrical contact with each other and become conductive.
- the alumite subjected to the sealing treatment has increased flatness, and the electrode pattern formed thereon cannot be expected to have an anchor effect due to the uneven surface, and is easily peeled off.
- Patent Document 2 a thin film of a refractory metal such as Ni, Ti, Co, or Cr is inserted by a sputtering method in order to ensure adhesion between copper and anodized.
- a refractory metal such as Ni, Ti, Co, or Cr
- the Ni, Ti, Co, Cr, etc. layers formed by sputtering form an alumite and a metallized layer and are interposed between copper and anodized to improve the adhesion strength between copper and anodized. It is done.
- sputtering is a process that requires a vacuum device, has a low tact, and becomes a major cost increase factor in the manufacture of large substrates for high-intensity lighting.
- a high-luminance lighting substrate that needs to have a plurality of light emitting elements such as five or ten, particularly 100 or more, integratedly mounted, the area of the electrode pattern is large, so that the substrate size per one is large.
- the number of substrates that can be processed in one tact is reduced and production is inefficient.
- electrode formation using sputtering is a high-intensity illumination.
- the production of a light emitting element integrated substrate or a large substrate for use is expensive, and is not suitable for commercial production in this application.
- the present invention has been made in view of the above problems, and an object of the present invention is to form a light-emitting device by forming a thick electrode pattern on a thick ceramic layer having a good electrical withstand voltage on a metal substrate.
- An object of the present invention is to provide a substrate for a light emitting device that can keep the thermal resistance of the entire substrate for use low.
- a substrate for a light-emitting device includes a metal base, a first electrically insulating layer having high thermal conductivity formed on the metal base, and the first A substrate for a light emitting device, comprising: an electrode pattern formed on the first electrically insulating layer, wherein the electrode pattern is a base layer made of a first metal layer formed on the first electrically insulating layer A wiring portion made of the second metal layer formed on the underlayer, and an electrode terminal portion formed on the wiring portion, and the electrode terminal portion in the electrode pattern is formed
- the thickness of the non-existing portion is at least 35 ⁇ m or more (set in accordance with the thermal resistance of the first electrical insulating layer).
- thermo resistance of the entire light emitting device substrate can be kept low.
- 1 to 5 are diagrams showing manufacturing steps of the light emitting device 301 according to this embodiment.
- the light-emitting device is a circuit board in which a metal substrate 1 made of aluminum and a ceramic layer (first electrical insulating layer) 2 made of alumina are laminated.
- the light emitting device substrate 320 includes a light emitting element 12 connected to the electrode terminal portion 10 of the electrode pattern formed on the ceramic layer 2.
- the electrode pattern includes a relatively thin first metal layer 5 (underlayer) formed on the ceramic layer 2 and a second metal layer thicker than the first metal layer 5 formed on the first metal layer 5. 7 and the silver layer 8 formed on the second metal layer 7, and the electrode terminal portion 10 is formed on the silver layer 8.
- the wiring portion has a multilayer structure in which the second metal layer 7 is made of a copper layer, and the silver layer 8 is laminated on the copper layer.
- the thickness of the portion of the electrode pattern where the electrode terminal portion 10 is not formed is set in accordance with the thermal resistance of the ceramic layer 2. ing. Details of this point will be described later.
- ⁇ Electrode forming method 1> (Preparation of substrate for insulating substrate using metal substrate) First, as shown in FIG. 1A, a metal substrate 1 is prepared. Next, the ceramic layer 2 is formed on the metal substrate 1 as shown in FIG.
- the metal substrate 1 is particularly preferably a metal having a high thermal conductivity and excellent heat dissipation, such as aluminum and copper.
- the metal substrate 1 may be a stainless steel substrate or a substrate made of a metal containing iron as a material. In this case, since the mechanical strength is strong, the substrate can be made thin, and as a result, high heat dissipation can be secured. Therefore, it is also preferable as a high heat dissipation base.
- aluminum that is lightweight and excellent in workability is used.
- the ceramic layer 2 may be any inorganic solid material having excellent heat dissipation, electrical insulation, and heat resistance, but widely used alumina is highly reliable in material and mass-productive. Most preferable because of its superiority. With a thickness of 200 ⁇ m-300 ⁇ m, a breakdown voltage of about 4.5 kV or more can be realized.
- the thickness of the anodized aluminum substrate formed by anodizing the aluminum substrate is 10 ⁇ m, and even if it is 50 ⁇ m at the maximum, it is difficult to achieve a dielectric breakdown voltage exceeding 1 kV even after the sealing treatment. is there.
- a high temperature heat treatment with a substrate temperature exceeding 300 ° C. is required. In such a high temperature treatment, the alumite layer is used. Cracks will occur and the dielectric strength will be significantly reduced.
- a thick ceramic layer having excellent withstand voltage is used instead of the alumite layer formed by using the anodic oxidation method having the above-mentioned drawbacks.
- a method for forming this thick film ceramic layer for example, a method in which ceramic particles are sprayed and deposited on a substrate at a high speed, such as spraying, AD method (aerosol deposition method), etc., can efficiently form a ceramic layer. Therefore, it is preferable.
- the AD method uses a pressure difference to accelerate the ceramic particles and requires a vacuum device. However, since the purpose is to accelerate the ceramic fine particles, it does not require the quality of the vacuum as in the case of sputtering. It is sufficient that the minimum pressure reduction necessary for the operation is performed. For this reason, unlike the vacuum apparatus using the sputtering method used for electrode formation or the like, the vacuum apparatus used for the AD method does not regulate productivity.
- the surface of the substrate is preferably blasted in advance, and the difference in linear expansion coefficient between the metal substrate and the ceramic layer is further reduced.
- an alloy of nickel and aluminum is preferably used as the buffer layer.
- Another method for forming the ceramic layer is to apply a paint containing ceramic particles using a resin as a binder to a metal substrate and then firing it to form a mixed layer of ceramic particles and resin, or alternatively, a glass raw material and ceramic particles
- the mixed paint may be applied and then sintered to form a mixed layer of ceramic particles and glass.
- a protective layer 3d is formed on the side of the metal substrate 1 opposite to the ceramic layer 2.
- a protective sheet may be attached.
- aluminum is used as the metal substrate 1, it is easy to form an alumite layer by anodizing, and it is stable as it is after the manufacturing process is completed. It can be used as a protective film.
- the alumite layer is sealed with hot water or the like, the through hole reaching the metal substrate 1 from the surface generated in the layer is closed, and a more stable protective layer is formed.
- the base preparation of the insulating substrate using aluminum as the metal substrate 1 is completed by the above procedure.
- Electrode formation First method
- a method of forming an electrode layer on the ground of the insulating substrate prepared by the above procedure will be described.
- a thin first metal layer 5 is formed on the ceramic layer 2. Since the ceramic layer 2 is formed of an electrically insulating material, the electrically conductive layer cannot be directly formed on the ceramic layer 2 by electrolytic plating. For this reason, as shown in FIG. 2A, the surface of the ceramic layer 2 is covered with the catalyst layer 4 in advance. For example, the ceramic layer 2 coated with a palladium catalyst as the catalyst layer 4 can be replaced with a thin electroless plating layer of copper by an electroless plating method. In this way, the first metal layer is formed on the ceramic layer 2. 5 is formed as an electrically conductive layer. The thickness of the first metal layer 5 is usually 1 ⁇ m or less, and may be a very thin layer of 0.1 ⁇ m or less. The thin first metal layer 5 thus prepared is made of an alloy of copper and palladium in which a part of palladium used for the catalyst is taken into copper. A thick metal can be deposited on the first metal layer 5 using an electrolytic plating method.
- the surface of the ceramic layer 2 formed by thermal spraying has an uneven shape having a depth of, for example, about 5 ⁇ m to 20 ⁇ m, fine pores, and the like, and therefore has an anchor effect on the first metal layer 5.
- the two layers (ceramic layer 2 and first metal layer 5) achieve good adhesion.
- the ceramic layer 2 formed by the AD method is denser and has better flatness than that formed by thermal spraying. For this reason, for the purpose of improving the adhesion between the ceramic layer 2 and the first metal layer 5, the surface of the ceramic layer 2 is lightly blasted to intentionally form an uneven shape on the surface, and then the first metal layer 5 May be formed.
- the thickness of the ceramic layer 2 in the present embodiment is 200-300 ⁇ m, which is a thick film. For this reason, even if the surface of the ceramic layer 2 is lightly blasted, there is no inconvenience that the ceramic layer 2 is peeled off by impact or shows a decrease in dielectric strength performance that causes a problem in actual use.
- the first metal layer 5 of copper is directly formed on the ceramic layer 2 of the present invention by electroless plating using a palladium catalyst as the catalyst layer 4, and the first metal layer 5 having a small thickness is used as a seed metal. Even if the thick second metal layer 7 (FIG. 3) is formed, it is possible to ensure sufficient adhesion between the ceramic layer 2 and the first metal layer 5.
- the first metal layer 5 may be formed by forming a thin layer of nickel using a catalyst and then forming a thin layer of copper using the catalyst.
- the first metal layer 5 of copper is directly formed on the ceramic layer 2 by electroless plating using a palladium catalyst as the catalyst layer 4, and the first metal layer 5 having a small thickness is used as a seed metal to increase the thickness.
- the seed metal composed of the first metal layer 5 can be easily electrically separated by using ferric chloride and can be finished as an electrode pattern. It is.
- the adhesiveness between the electrode pattern and the ceramic layer 2 is sufficiently secured. For this reason, it is preferable to use only copper for the first metal layer 5.
- cyanide compounds such as an aqueous potassium cyanide solution.
- cyanide compounds are powerful drugs, they can be used as regular substances in the plating process.
- the maximum thickness of the electrode pattern including the terminal portion exceeds 50 ⁇ m to 100 ⁇ m. It can be seen that the thickness of the normal electrode pattern is very large as compared with less than 10 ⁇ m.
- the electrode pattern is thickened in this manner when the flip-chip type light emitting device is mounted on the electrode pattern on the substrate in which the ceramic layer is formed on the metal substrate and the withstand voltage is provided. This is because the thermal resistance of the substrate can be lowered by increasing the thickness and the electrode area. This is because the heat generated in the light emitting element is also diffused in the horizontal direction while passing through the electrode pattern in the vertical direction, and spreads sufficiently in the horizontal direction until it reaches the ceramic layer having a lower thermal conductivity than the electrode pattern. It is an effect obtained from this.
- a thick film electrode in this way, if an electrode pattern is formed by the following method disclosed in the present embodiment, a minimum amount of metal necessary for electrode formation may be deposited.
- the electrode material can be used efficiently and the loss can be reduced.
- a photomask may be formed using a photoresist, or a mask may be formed using an insulating adhesive sheet (dry film).
- the electroplating process can be performed using the first metal layer 5 as an electrode.
- the metal can be deposited from the plating solution on the first metal layer 5.
- a thick second metal layer 7 is formed.
- the silver layer 8 may be formed by electrolytic plating or the like so as to cover a thick electrode layer ((b) of FIG. 3).
- the electrode terminal portion 10 may be formed.
- the electrode terminal portion 10 may be made of a metal having excellent electrical conductivity and thermal conductivity, such as copper.
- the surface of the electrode terminal portion 10 may be used as it is, but may be protected with another metal such as Au.
- the electrode terminal portion 10 may be plated after the formation of the electrode terminal portion 10, and after the light reflecting layer 11 shown in FIG. The plating process may be performed.
- the metal substrate 1 is covered with the protective layer 3, a mask, or the like, there is no concern that the metal substrate 1 is eroded by the plating solution when plating is performed. In particular, it is stably protected by being covered with the protective layer 3 made of alumite.
- the first mask 6 and the second mask 9 were removed to expose the conductive layer (first metal layer 5) as shown in FIG. 4B.
- the first metal layer 5 is removed by etching to separate the metal layers from each other, and an electrode pattern is formed as shown in FIG. Since the thickness of the first metal layer 5 is as thin as 1 ⁇ m or less, it can be easily removed with an etching solution. In this embodiment, since copper is used as the material of the first metal layer 5, it can be easily removed with an aqueous solution of iron (III) chloride (also called ferric chloride).
- cyanide compound for example, potassium cyanide aqueous solution
- cyanide compounds are powerful drugs, they are always used in the plating process.
- a palladium catalyst residue remover made of a non-cyan compound without using a cyan compound is also commercially available and may be used.
- the surface of the ceramic layer formed by spraying and depositing ceramic particles toward the metal substrate 1 at high speed, such as thermal spraying or AD method, is appropriately roughened. Even if a copper layer is formed directly as the first metal layer 5 without interposing a metal layer such as Ni, Ti, Co, Cr, etc., sufficient adhesion between the ceramic layer 2 and the first metal layer 5 is ensured. This is because it is possible. As a result, it is necessary to use a metal such as Ni, Ti, Co, Cr as a base metal to form an electrode pattern, and it is also necessary to use hydrofluoric acid, which is an essential powerful agent for removing these metals. Will also disappear.
- fine pores exist in the ceramic layer formed by thermal spraying or AD method as it is.
- hydrofluoric acid used in the manufacturing process, hydrofluoric acid soaked from fine pores reaches the metal substrate 1 and invades the joint surface between the metal substrate 1 and the ceramic layer 2 to peel off the ceramic layer. End up. For this reason, it is necessary to avoid using hydrofluoric acid in the etching process of the first metal layer 5 and using a metal such as Ni, Ti, Co, Cr for the first metal layer 5 in the first place. .
- any material Since the structure represented by (-O-Si-O-) is the main structure, it is also eroded by hydrofluoric acid.
- the ceramic layer 2 formed by spraying and depositing ceramic particles toward the substrate at high speed such as thermal spraying or AD method, as in this embodiment, Ni, Ti, Co, It is important to be able to form an electrode pattern on the ceramic layer 2 via the thin first metal layer 5 made of copper without interposing a metal such as Cr. is there.
- the electrode pattern is covered with the light reflecting layer 11 so that the electrode terminal portion 10 is exposed.
- a resin or glass containing a light reflecting material is used.
- a white material such as a high reflectance ceramic is often used.
- a paint in which ceramics such as titanium oxide, alumina, and silica are mixed with a resin, or a paint in which zirconia oxide is mixed with a glass material is printed on the electrode pattern. If screen printing is used, the electrode terminal portion 10 can be printed so as to be exposed. Then, the light reflecting layer 11 can be formed by curing by drying, baking or the like.
- the electrode terminal portion 10 is also covered with the paint. Therefore, after the paint is cured, it is necessary to expose the electrode terminal portion 10 by polishing or the like.
- a light reflecting material such as ceramic particles
- a method of depositing ceramic particles by spraying at high speed toward an electrode pattern there is, for example, a method of depositing ceramic particles by spraying at high speed toward an electrode pattern.
- Typical examples of such methods include thermal spraying, AD method (aerosol deposition method) and the like, which are further classified by a method for generating a high-speed particle flow.
- AD method aerosol deposition method
- the electrode terminal portion 10 is covered with the light reflecting layer, so that it is necessary to expose the electrode terminal portion 10 by polishing or the like.
- the circuit board (high-intensity light-emitting device substrate) 320 shown in FIG. 5A can be prepared.
- the light emitting element 12 is mounted on the circuit board 320 shown in FIG. 5A to finish the light emitting device as shown in FIG.
- the light emitting element 12 may be connected to the electrode terminal portion 10 using solder.
- solder As the solder to be used, AuSn eutectic solder, Sn—Ag—Cu solder, or the like may be appropriately selected according to the use environment and use conditions of the light emitting device.
- the ceramics repeatedly referred to in the present invention are not limited to metal oxides, but include broadly defined ceramics including aluminum nitride, silicon nitride, silicon carbide and the like, that is, all inorganic solid materials. . Of these inorganic solid materials, any material suitable for the purpose of use may be used in consideration of characteristics such as heat resistance, thermal conductivity, withstand voltage, or light reflectivity.
- Modification 1 As a first modification of the present embodiment, another method (thermal spraying, AD method) for forming the thin first metal layer 5 will be described.
- the first metal layer 5 on the ceramic layer 2 As a method of forming the first metal layer 5 on the ceramic layer 2, a method of forming a thin copper plating layer on the surface of the ceramic layer coated with the catalyst by an electroless plating method has been described.
- the method of forming the first metal layer 5 on the ceramic layer 2 to form an electrically conductive layer is not limited to this.
- metal particles may be sprayed and deposited at a high speed.
- Typical examples of such methods include thermal spraying and AD method (aerosol deposition method).
- AD method the thickness of the first metal layer 5 can be 1 ⁇ m or less.
- thermal spraying the thickness is about 20-30 ⁇ m thicker than this.
- a thick metal can be stacked on the seed metal made of the first metal layer 5 thus prepared by using an electrolytic plating method. Thereafter, the electrode pattern may be formed according to the procedure already described in the first embodiment.
- 6 to 10 are diagrams showing manufacturing steps of the light emitting device according to this embodiment.
- the light emitting device according to the present embodiment has almost the same configuration as that of the light emitting device shown in FIG. 5B of the first embodiment. However, as shown in FIG. It differs in that it is integrally formed. That is, in the light emitting device shown in FIG. 10, the electrode terminal portion 10 and the second metal layer 7 are integrally formed, whereas in the light emitting device of the first embodiment, as shown in FIG. As shown, a silver layer 8 is formed between the electrode terminal portion 10 and the second metal layer 7.
- FIGS. 6A to 6C corresponding to the present embodiment are the same as FIGS. 1A to 1C corresponding to the first embodiment.
- Electrode formation second method
- a method for forming an electrode layer on a base of an insulating substrate prepared by the above procedure will be described.
- a thin first metal layer 5 is formed on the ceramic layer 2.
- the processing so far follows the processing up to (b) in FIG. 2 of the first embodiment.
- the method for forming the first metal layer 5 may be an electroless plating method using a catalyst, or other methods such as spraying, AD method, etc. shown in the first modification. It may be a method.
- a thick metal can be deposited on the first metal layer 5 thus prepared by using an electrolytic plating method. That is, using the first metal layer 5 as an electrode, a metal is deposited from the plating solution on the first metal layer 5, and as shown in FIG. One surface of the metal layer 7 is formed.
- An electrode pattern is formed by etching from the metal layer composed of the first metal layer 5 and the second metal layer 7 thus prepared. At this time, it is desirable to form an electrode pattern by repeatedly forming and etching a mask having an opening corresponding to the required electrode pattern (FIGS. 8A to 9B).
- a photomask may be formed using a photoresist, or a mask may be formed using an insulating adhesive sheet.
- a first mask 6A is formed so as to be in contact with the second metal layer 7, and an etching process is performed. Finally, the thick metal layer 7 is carved halfway by etching while leaving the electrode terminal portion and the portion used as the electrode pattern (FIG. 8B).
- a second mask 9A is formed on the remaining thick second metal layer 7, and then the second metal layer 7 and the first metal layer are further formed. 5 is etched in order, and etching is performed until the ceramic layer 2 is reached (FIG. 9A), and the electrode pattern 13 is carved out of the metal layers (first metal layer 5 and second metal layer 7) (FIG. 9). (B)).
- both the first metal layer 5 and the second metal layer 7 are made of copper, an electrode pattern is formed from the metal layer using an aqueous solution of iron (III) chloride (also called ferric chloride) as in the first embodiment. 13 can be formed.
- iron (III) chloride also called ferric chloride
- Ni, Ti, Co, Cr or the like for the first metal layer 5 having a small thickness.
- hydrogen acid for this reason, the problem that the ceramic layer 2 peels from the metal substrate 1 by being eroded by hydrofluoric acid does not occur.
- a palladium catalyst residue remover when using a palladium catalyst for formation of the 1st metal layer 5, in order to remove the residue of a palladium catalyst, what is necessary is just to use a commercially available palladium catalyst residue remover.
- a typical example of the removing agent is a cyanide compound such as an aqueous potassium cyanide solution.
- a palladium catalyst residue remover made of a non-cyanide compound is also commercially available and may be removed by using it.
- a cyanide compound is a powerful drug, but is a substance that is commonly used in plating. Therefore, it can be handled relatively easily in a normal plating facility.
- the electrode pattern 13 is covered with the light reflecting layer 11 so that the electrode terminal portion 10 is exposed.
- the light-reflecting material and the forming method used for the light-reflecting layer 11 may follow the method described in the electrode forming method 1 of the first embodiment, and the description is omitted here to avoid repetition. Regardless of which method is selected, it is necessary to expose the electrode terminal portion 10 from the light reflecting layer 11.
- the electrode terminal portion 10 may be made of a metal having excellent electrical conductivity and thermal conductivity, such as copper.
- the surface of the electrode terminal portion 10 may be used as copper, but may be protected with another metal such as Au.
- the surface of the electrode terminal portion 10 is plated subsequent to the formation of the light reflecting layer 11.
- the electrode terminal portion 10 may be covered with Ni / Pd / Au.
- the metal substrate 1 is covered with the protective layer 3 and the light reflection layer 11, there is no fear that the metal substrate 1 is eroded by the plating solution when plating is performed. In particular, it is stably protected from the plating solution by being covered with the protective layer 3 made of alumite.
- a circuit board (high brightness light emitting device substrate) 320A shown in FIG. 9C can be prepared. Further, the light emitting element 12 is mounted on the circuit board 320A shown in FIG. 9C to finish the light emitting device as shown in FIG. In this case, the light emitting element 12 may be connected to the electrode terminal portion 10 using solder. Similar to the electrode forming method 1 of the first embodiment, AuSn eutectic solder, Sn—Ag—Cu solder, etc. are used appropriately according to the use environment and use conditions of the light emitting device. Just choose.
- FIG. 11 is a diagram showing a schematic configuration of the light emitting device according to the present embodiment.
- the light emitting device according to this embodiment includes a circuit board 320B having a structure different from that of the circuit boards of the first and second embodiments.
- the light emitting device in order to stably mount the light emitting element 12 on the electrode terminal portion 10 and realize a long life as the light emitting device, it is necessary to obtain good flatness on the surface of the electrode terminal portion 10. It is. In order to realize this, as shown in FIG. 11, it is preferable to interpose the planarizing layer 15 between the ceramic layer 2 and the thin first metal layer 5 in the circuit board 320B.
- the thickness of the metal substrate 1 constituting the circuit board 320B is 3 mm
- the ceramic layer 2 is 300 ⁇ m.
- the surface when the thick second metal layer 7 is formed by electrolytic plating can also be kept flat. For this reason, it is not necessary to perform another operation such as polishing in order to make the electrode terminal portion 10 flat, and the loss of the electrode material can be reduced.
- the planarizing layer 15 may be a material that forms glass using a resin or sol-gel reaction, but the thermal conductivity of these materials is small, and the substrate is formed by forming the planarizing layer with these materials. There is a case where the thermal resistance of the becomes high. As a measure for avoiding this, it is desirable to use ceramic particles having an appropriate size mixed with a material for forming a flattened layer and having a high thermal conductivity.
- Such a planarization layer 15 is particularly effective when the ceramic layer 2 is formed by thermal spraying.
- the particle size of the ceramic particles used for thermal spraying is usually as large as 10 ⁇ m to 40 ⁇ m, and the irregularities formed on the surface of the ceramic layer 2 are considerably large.
- the first metal layer 5 having a small thickness is deposited by electroless plating and the second metal layer 7 having a large thickness is deposited by electrolytic plating, and the total thickness of the metal layers is 100 ⁇ m or more, the surface of the metal layer is flattened. However, the influence of the unevenness formed on the surface of the ceramic layer 2 remains.
- inorganic materials selected with a particle size of 10 ⁇ m or less, such as silica, alumina, aluminum nitride, titanium oxide, etc.
- the ceramic to be used may be mixed with the above-described resin or a substance that forms glass using the sol-gel reaction, and then applied to the ceramic layer 2, followed by drying, curing, firing, and the like.
- the typical particle size of ceramic particles used in the AD method is 2 ⁇ m or less, and further, these particles are sprayed onto the substrate, pulverized and laminated,
- the representative particle size of the ceramic particles constituting the ceramic layer 2 formed by the AD method is also smaller and is about 100 nm. For this reason, for example, after the ceramic layer 2 made of alumina is formed, a ceramic deposition layer typified by alumina can be formed by the AD method and used as the planarizing layer 15.
- the ceramic layer 2 is completely flattened by the flattening layer 15, there may be a disadvantage that the adhesion of the first metal layer 5 is lowered.
- the surface of the planarizing layer 15 may be lightly blasted again to be lightly roughened.
- a small uneven shape of, for example, 5 ⁇ m or less, desirably 2 ⁇ m or less is formed on the surface of the planarizing layer 15.
- the surface of the ceramic layer 2 formed by thermal spraying has a large uneven shape having a depth of, for example, about 5 to 20 ⁇ m.
- the planarizing layer 15 functions as a substantially flat surface with respect to the initial surface of the ceramic layer 2.
- the planarization layer 15 obtained in this way has small irregularities on the surface, so that it gives an anchor effect to the first metal layer 5 and can have sufficient adhesion.
- the first metal layer 5 substantially functions as a planarizing layer. This is because, by interposing the planarizing layer 15, large irregularities exceeding 5 ⁇ m, for example, seen on the surface of the ceramic layer 2 can be erased, and the irregularities can be controlled to be 5 ⁇ m or less, desirably 2 ⁇ m or less. This is because the surface when the second metal layer 7 is formed can be made flat.
- a light emitting device is formed by mounting a light emitting element on the circuit board described in the first to third embodiments, and a lighting device including the light emitting device will be described.
- FIG. 12A is a perspective view showing an appearance of the illumination device 101 according to the fourth embodiment
- FIG. 12B is a cross-sectional view of the illumination device 101.
- the illumination device 101 includes a light emitting device 301, a heat sink 102 for radiating heat generated from the light emitting device 301, and a reflector 103 that reflects light emitted from the light emitting device 301.
- the configuration of the light-emitting device 301 is the same as that of the light-emitting device described in the first to third embodiments, and thus the details are omitted.
- FIG. 13 is a perspective view showing the appearance of the light emitting device 301 and the heat sink 102.
- the light emitting device 301 may be used by being attached to the heat sink 102.
- the light emitting device 301 includes a circuit board 320C and a light emitting element 304.
- the circuit board 320C includes a metal substrate 302, an intermediate layer (first electrical insulating layer) 311 (shown in FIG. 15), an electrode pattern (wiring pattern) 303, and a reflective layer (second electrical insulating layer) 312 ( 15).
- the circuit board 320C is a representative example of the circuit board prepared by the method described in the first to third embodiments
- the light emitting device 301 is the circuit disclosed in the first to third embodiments.
- a case where the light emitting element 304 is mounted on a substrate is illustrated as a representative. Therefore, the intermediate layer 311 constituting the circuit board 320C corresponds to the ceramic layer 2 of the first to third embodiments, and the electrode pattern 303 corresponds to the electrode pattern of the first to third embodiments. That is, the electrode pattern 303 is formed by etching the thin first metal layer 5 and the thick second metal layer 7 stacked on the intermediate layer 311 into a predetermined pattern.
- the light emitting element 304 is electrically connected to the electrode pattern 303, and FIG. 14 shows nine light emitting elements (LED chips) 304 arranged in three rows and three columns.
- the nine light emitting elements 304 are connected in parallel in three rows by the electrode pattern 303, and each of the three rows has a connection configuration having a series circuit of three light emitting elements 304 (that is, 3 series / 3 parallel). ing.
- the number of the light emitting elements 304 is not limited to nine, and it is not necessary to have a 3 series / 3 parallel connection configuration.
- the light emitting device 301 includes a light reflecting resin frame 305, a phosphor-containing sealing resin 306, an anode electrode (anode land or anode connector) 307, a cathode electrode (cathode land or cathode connector) 308, The anode mark 309 and the cathode mark 310 are provided.
- the light reflection resin frame 305 is an annular (arc-shaped) frame made of an alumina filler-containing silicone resin provided on the electrode pattern 303 and the reflection layer 312.
- the material of the light reflecting resin frame 305 is not limited to this, and may be any insulating resin having light reflectivity.
- the shape is not limited to an annular shape (arc shape), and can be any shape.
- the phosphor-containing sealing resin 306 is a sealing resin layer made of a translucent resin.
- the phosphor-containing sealing resin 306 is filled in a region surrounded by the light reflecting resin frame 305 and seals the light emitting element 304 and the reflective layer 312.
- the phosphor-containing sealing resin 306 contains a phosphor.
- As the phosphor a phosphor that is excited by the primary light emitted from the light emitting element 304 and emits light having a longer wavelength than the primary light is used.
- the configuration of the phosphor is not particularly limited, and can be appropriately selected according to desired white chromaticity and the like.
- a combination of YAG yellow phosphor and (Sr, Ca) AlSiN 3 : Eu red phosphor, a combination of YAG yellow phosphor and CaAlSiN 3 : Eu red phosphor, or the like is used as a combination of daylight white color or light bulb color. be able to.
- As a combination of high color rendering (Sr, Ca) AlSiN 3 : Eu red phosphor and Ca 3 (Sc, Mg) 2 Si 3 O 12 : Ce green phosphor or Lu 3 Al 5 O 12 : Ce green phosphor
- the combination of another fluorescent substance may be used and the structure containing only a YAG yellow fluorescent substance as pseudo white may be used.
- the anode electrode 307 and the cathode electrode 308 are electrodes for supplying a current for driving the light emitting element 304 to the light emitting element 304, and are provided in the form of lands.
- a connector may be installed in the land portion to provide the anode electrode 307 and the cathode electrode 308 in the form of a connector.
- An anode electrode (anode land or anode connector) 307 and a cathode electrode (cathode land or cathode connector) 308 are electrodes that can be connected to an external power source (not shown) in the light emitting device 301.
- the anode electrode (anode land or anode connector) 307 and the cathode electrode (cathode land or cathode connector) 308 are connected to the light emitting element 304 via the electrode pattern 303.
- the anode mark 309 and the cathode mark 310 are alignment marks serving as references for positioning with respect to the anode electrode (anode land or anode connector) 307 and the cathode electrode (cathode land or cathode connector) 308, respectively. is there.
- the anode mark 309 and the cathode mark 310 have a function of indicating the polarities of the anode electrode (anode land or anode connector) 307 and the cathode electrode (cathode land or cathode connector) 308, respectively.
- the thickness of the portion of the electrode pattern 303 immediately below the anode electrode (anode land or anode connector) 307 and the cathode electrode (cathode land or cathode connector) 308 is the electrode pattern 303 at a position other than immediately below the electrode pattern 303. Is larger than the thickness (corresponding to the portion of the electrode pattern 303 in FIG. 15 covered with the reflective layer 312).
- FIG. 16 shows an example of a schematic diagram of a light emitting device for calculating thermal resistance, where (a) is a cross-sectional view of the light emitting device, and (b) is a plan view of the light emitting device. Note that FIG. 16B illustrates a plan view of the light-emitting device in a state where the reflective layer is peeled off for convenience of explanation.
- the heat generated in the light emitting element diffuses while spreading in the direction of 45 ° from the light emitting element toward the metal substrate through the wiring pattern, as shown in FIG.
- FIGS. 16A and 16B since a heat conductive insulating layer is present immediately below the light emitting element, heat sources from the light emitting element are provided at two locations (the anode side and the negative electrode side of the electrode terminal). Therefore, the calculation of thermal resistance is a little complicated. For this reason, in order to further simplify the thermal resistance calculation, the schematic diagram of the light emitting device shown in FIGS.
- FIG. 17 shows an example of a schematic diagram of a light-emitting device for thermal resistance calculation simplified compared to FIG. 16, where (a) is a cross-sectional view of the light-emitting device, and (b) is a plan view of the light-emitting device. Note that FIG. 18B also shows a plan view of the light emitting device in a state where the reflective layer is peeled off for convenience of explanation.
- the heat source from the light emitting element can be provided at one place (the anode and the negative electrode of the electrode terminal are combined into one), so that the thermal resistance calculation can be simplified. .
- the light-emitting element has a positive direction shape with one side of 500 ⁇ m, and 70% of the area of the lower surface of the light-emitting element is the same as the area of the upper surface of the electrode. Further, the thermal resistance is estimated by assuming that the area of the electrode terminal portion on which the light emitting element is mounted in the conductive layer is the same as the electrode area of the light emitting element.
- the layer thickness of the wiring pattern is 0.5 mm (500 ⁇ m) in Table 1, 0.05 mm (50 ⁇ m) in Table 2, and 0.005 mm (5 ⁇ m) in Table 3.
- thermal resistance of the thermally conductive insulating layer occupies most of the thermal resistance of the entire substrate. That is, it can be seen that the main factor of the thermal resistance in the entire substrate is due to the heat conductive insulating film. It can also be seen that the thickness of the wiring pattern affects the value of the thermal resistance of the thermally conductive insulating layer.
- the 0.05 mm (50 ⁇ m) wiring pattern shown in Table 2 which is one digit thicker than the 0.005 mm (5 ⁇ m) thick wiring pattern shown in Table 3, has a thermal resistance of 23 as a whole due to the spread of heat. It can be seen that the temperature decreased by 6 ° C. or more. Furthermore, in the 0.5 mm (500 ⁇ m) wiring pattern shown in Table 1 which is two orders of magnitude thicker, it can be seen that the thermal resistance of the entire substrate is reduced by 80% or more and the temperature is lowered by 21 ° C.
- the thickness of the wiring pattern determines the thermal resistance of the thermally conductive insulating layer (ceramic layer 2).
- FIG. 18 is a graph showing the relationship between the thickness of the wiring pattern and the thermal resistance obtained at this time.
- FIG. 19 is a graph showing the relationship between the thickness of the wiring pattern obtained at this time and the temperature rise.
- the thickness of the wiring pattern is 0.5 mm (500 ⁇ m), but at least the thickness of the wiring pattern is 0.035. If it is (35 ⁇ m) or 0.05 mm (50 ⁇ m) or more, more desirably 100 ⁇ m or more, a temperature improvement effect of several degrees C. or more, and in some cases, several ten degrees C. is obtained.
- the thickness of the wiring pattern is 35 ⁇ m, a temperature drop of about 5 ° C. can be expected in the thermally conductive insulating layer as compared with the case of 0 ⁇ m.
- the wiring pattern has a thin portion without electrode terminals (the portion where the first metal layer 5 and the second metal layer 7 are overlapped) and is at least 35 ⁇ m to 100 ⁇ m or more, the above effect can be obtained. I understand.
- the first metal layer 5 and the second metal constituting the wiring pattern are important.
- the layers 7 do not necessarily have to be distinguished by a clear boundary.
- a substrate for a light emitting device (hereinafter referred to as a circuit board) according to an aspect 1 of the present invention includes a metal base 1 and a first electrically insulating layer (ceramic layer 2) formed on the metal base 1 and having thermal conductivity. ) And an electrode pattern 13 formed on the first electrical insulation layer (ceramic layer 2), the electrode pattern 13 comprising the first electrical insulation layer (ceramics).
- the thickness of the portion of the electrode pattern 13 where the electrode terminal portion 10 is not formed is at least 35 ⁇ m or more.
- the thermal conductivity of the first electrical insulating layer formed on the metal substrate is a constant determined by the material, but the thermal resistance constitutes an electrode pattern formed on the first electrical insulating layer. It is possible to arbitrarily change the thickness of the base layer and the wiring portion.
- the electrode pattern is formed of a metal having high thermal conductivity, for example, copper. For this reason, even if the thickness of the base layer and the wiring portion is increased, the thermal resistance that is applied while the heat is diffused through the electrode pattern in the substrate vertical direction is very low, and the first electrical insulating layer is formed in the substrate vertical direction. This level is negligible compared to the case of passing through. While heat is diffused in the vertical direction of the substrate, the heat is also diffused in the horizontal direction of the substrate. For the same reason, the thermal resistance received by the heat diffused in the horizontal direction of the substrate is at a level that can be ignored.
- the heat flow rate is defined as the amount of heat per unit time passing through a cross section of a unit area, and the unit is an amount expressed in W / m 2 (watts per square meter).
- the thermal conductivity of the first electrical insulating layer is the same value as the previous example, the thermal resistance of the first electrical insulating layer is increased.
- the thermal resistance of the first electrical insulation layer affects the magnitude of the thermal resistance of the entire circuit board. If the thermal resistance of the circuit board is large, the thermal resistance of the entire circuit board also increases. If the thermal resistance of the first electrical insulating layer is small, the thermal resistance of the entire circuit board also decreases.
- the thickness of the portion where the electrode terminal portion is not formed in the electrode pattern is such that the thermal resistance of the first electrical insulating layer becomes a desired thermal resistance.
- the thermal resistance of the entire circuit board can be determined. That is, it is possible to change the thermal resistance of the entire circuit board depending on the thickness of the portion of the electrode pattern where the electrode terminal portion is not formed. For example, if the thickness is reduced, the thermal resistance of the entire circuit board can be increased, and if the thickness is increased, the thermal resistance of the entire circuit board can be reduced.
- the thickness of the part where the electrode terminal part is not formed in the electrode pattern is set to a predetermined thickness or more, that is, if it is at least 35 ⁇ m or more, the thermal resistance of the entire circuit board can be kept low.
- the circuit board according to Aspect 2 of the present invention is the circuit board according to Aspect 1, wherein the first metal layer 5 is a metal layer formed by an electroless plating method using a catalyst, and the second metal layer 7 is an electrolytic layer. It is preferable that the metal layer is formed by plating and is thicker than the first metal layer 5.
- the first metal layer 5 is a metal layer formed by a method of injecting metal particles at a high speed
- the second metal layer 7 is an electrolytic layer. It is preferable that the metal layer is formed by plating and is thicker than the one metal layer 5.
- the circuit board according to Aspect 4 of the present invention is the circuit board according to any one of Aspects 1 to 3, wherein the electrode pattern 13 and the first electrical insulating layer are exposed so that the electrode terminal portion 10 of the electrode pattern 13 is exposed.
- the second electrically insulating layer (light reflecting layer 11) has a thermal conductivity at least equal to or higher than that of the first electrically insulating layer (ceramic layer 2). It is preferable that the light reflectivity is at least equivalent to or higher than that of (1).
- the thickness of the second electrically insulating layer (light reflecting layer 11) in the portion covering the electrode pattern is 30 ⁇ m or more.
- the thickness of the second electrically insulating layer (light reflecting layer 11) formed on the electrode pattern is preferably 30 ⁇ m or more.
- the thickness of the second electrically insulating layer (light reflecting layer 11) in the portion covering the electrode pattern 13 is 30 ⁇ m or more. For this reason, even in the case of the electrode pattern 13 made of a metal having a relatively high light absorption rate such as copper, the light that reaches the electrode pattern 13 through the second electrically insulating layer having light reflectivity. Therefore, it is possible to provide a circuit board suitable for high-luminance illumination having a higher reflectance, that is, a light-emitting device substrate.
- the circuit board according to Aspect 6 of the present invention is the circuit board according to any one of Aspects 1 to 5, wherein the electrode pattern 13 in which the electrode terminal portion 10 is not formed has a thickness in the range of 35 ⁇ m to 100 ⁇ m. It is preferable that
- the wiring portion (second metal layer 7) is formed of copper or silver.
- the circuit board according to Aspect 8 of the present invention is the circuit board according to any one of Aspects 1 to 7, wherein the wiring portion is formed of a multilayer, and the silver layer 8 is formed on the copper layer (second metal layer 7). Preferably it is formed.
- the circuit board according to Aspect 9 of the present invention is the circuit board according to any one of Aspects 1 to 8, wherein the first electrically insulating layer (ceramic layer 2) is formed by spraying ceramic particles toward the substrate at a high speed. It is preferable to consist of the formed ceramic deposition layer.
- the circuit board according to aspect 10 of the present invention is the circuit board according to aspect 9, wherein the first electrically insulating layer (ceramic layer 2) is a ceramic deposit formed by thermal spraying or aerosol deposition (AD). It preferably consists of layers.
- the first electrically insulating layer is a ceramic deposit formed by thermal spraying or aerosol deposition (AD). It preferably consists of layers.
- the first electrical insulating layer (ceramic layer 2) is preferably made of alumina.
- the first electrical insulating layer (ceramic layer 2) is preferably made of a mixed layer of ceramics and glass.
- the circuit board according to aspect 13 of the present invention is the circuit board according to any one of the above aspects 4 to 12, wherein the second electrical insulating layer (light reflecting layer 11) is a ceramic layer, a mixed layer of ceramics and glass, or It is preferable to consist of a mixed layer of ceramics and resin.
- the metal base 1 is preferably aluminum, an alloy containing aluminum, copper, or an alloy containing copper.
- a light-emitting device is characterized by including a light-emitting element 12 that is electrically connected to the electrode terminal portion 10 in the circuit board according to any one of aspects 1 to 14.
- the illuminating device according to aspect 16 of the present invention includes the light emitting device 301 according to aspect 15 as a light source.
- a method for manufacturing a circuit board according to a seventeenth aspect of the present invention is a method for manufacturing a circuit board provided with a metal substrate 1, the step of forming a ceramic layer 2 on one surface of the metal substrate 1, and the ceramics A step of depositing a metal on the ceramic layer by an electroless plating method using a catalyst on the layer 2 to form a first metal layer 5 as an underlayer, and a mask layer (on the first metal layer 5) Forming a first mask 6) and forming a second metal layer 7 to be a wiring portion thicker than the first metal layer 5 in the mask opening by electrolytic plating, and the mask layer (first mask). And 6), the first metal layer 5 covered with the mask layer is removed by etching, and a desired electrode pattern 13 is formed.
- the second metal layer can be formed on the first metal layer by the electrolytic plating method. .
- a metal can be stacked thickly on the ceramic layer. That is, a thick metal layer (first metal layer + second metal layer) can be formed on the ceramic layer.
- the second metal layer is formed by an electrolytic plating method, the thickness can be easily adjusted, so that the thickness of the metal layer formed on the ceramic layer can be easily controlled.
- a method for manufacturing a circuit board according to an aspect 18 of the present invention is a method for manufacturing a circuit board including a metal substrate 1, the step of forming a ceramic layer 2 on one surface of the metal substrate 1, and the ceramics A step of depositing a metal on the ceramic layer 2 by an electroless plating method using a catalyst on the layer 2 to form a first metal layer 5 as an underlayer; and an electrolytic plating on the first metal layer 5 Forming a second metal layer 7 to be a wiring portion thicker than the first metal layer 5 by a method, and forming a mask layer on the second metal layer and etching the mask opening, A step of forming an electrode pattern 13 from the first metal layer 5 and the second metal layer 7.
- the second metal layer can be formed on the first metal layer by the electrolytic plating method. .
- a metal can be stacked thickly on the ceramic layer. That is, a thick metal layer (first metal layer + second metal layer) can be formed on the ceramic layer.
- the second metal layer is formed by an electrolytic plating method, the thickness can be easily adjusted, so that the thickness of the metal layer formed on the ceramic layer can be easily controlled.
- the electrode pattern is formed by etching after the formation of the second metal layer, the electrode pattern in which the first metal layer and the second metal layer are integrated (the boundary between the first metal layer and the second metal layer). Is an unclear electrode pattern).
- the step of forming the first metal layer 5 is performed on the ceramic layer 2 by an electroless plating method using a palladium catalyst as a catalyst.
- a step of forming a first metal layer 5 made of copper having a thickness of 5 ⁇ m or less by depositing a metal on the first metal layer 7 is formed by electrolytic plating on the first metal layer 5 made of copper. It is preferable to form the second metal layer 7 made of copper.
- a method for manufacturing a circuit board according to an aspect 20 of the present invention is a method for manufacturing a circuit board provided with a metal substrate 1, the step of forming a ceramic layer 2 on one surface of the metal substrate 1, and the ceramics
- the metal can be thickly stacked on the ceramic layer. That is, a thick metal layer (first metal layer + second metal layer) can be formed on the ceramic layer.
- the second metal layer is formed by an electrolytic plating method, the thickness can be easily adjusted, so that the thickness of the metal layer formed on the ceramic layer can be easily controlled.
- a method for manufacturing a circuit board according to a twenty-first aspect of the present invention is a method for manufacturing a circuit board including a metal substrate 1, the step of forming a ceramic layer 2 on one surface of the metal substrate 1, and the ceramics A process of forming metal particles on the layer 2 by spraying metal particles at a high speed to form a first metal layer 5 serving as a base layer, and the first metal layer 5 on the first metal layer 5 by electrolytic plating.
- the metal can be thickly stacked on the ceramic layer. That is, a thick metal layer (first metal layer + second metal layer) can be formed on the ceramic layer.
- the second metal layer is formed by an electrolytic plating method, the thickness can be easily adjusted, so that the thickness of the metal layer formed on the ceramic layer can be easily controlled.
- the electrode pattern is formed by etching after the formation of the second metal layer, the electrode pattern in which the first metal layer and the second metal layer are integrated (the boundary between the first metal layer and the second metal layer). Is an unclear electrode pattern).
- a method for manufacturing a circuit board according to an aspect 22 of the present invention is the method according to the aspect 20 or 21, wherein in the step of forming the first metal layer 5, as a method of depositing metal by jetting metal particles at a high speed, Alternatively, it is preferable to use the aerosol deposition method (AD method).
- AD method aerosol deposition method
- the step of forming the first metal layer 5 includes jetting the copper particles at a high speed to form the ceramic layer 2.
- the step of depositing copper thereon to form the first metal layer 5 made of copper having a thickness of 2 ⁇ m or more and 40 ⁇ m or less, and forming the second metal layer 7 includes electrolysis on the first metal layer 5 made of copper. It is preferable to form the second metal layer 7 made of copper by a plating method.
- the step of forming the electrode pattern 13 includes the step of forming the mask on the surface of the second metal layer 7 before removing the mask layer. After forming a silver layer (silver layer 8) through the opening, another mask layer is formed on the silver layer (silver layer 8), and an electrode made of copper is formed in the separately formed mask opening. It is preferable to form the terminal portion 10.
- a method for manufacturing a circuit board according to an aspect 25 of the present invention is a method for manufacturing a circuit board 320 including a base body (metal base body 1) made of aluminum, wherein the metal base body 1 is a metal base body made of aluminum, A protective layer 3 is formed on the other surface of the metal substrate 1 between the step of forming the ceramic layer 2 on one surface of the metal substrate 1 and the step of forming the first metal layer on the ceramic layer.
- the step of forming the protective layer 3 includes the step of covering the metal substrate 1 other than the portion covered with the ceramic layer 2 with an anodized film made of alumite by anodizing treatment. By performing the hole treatment, the protective layer 3 in which the holes formed in the porous shape are closed in the alumite layer is formed.
- the through hole formed in the ceramic layer 2 is filled with an insulating material and sealed. It is preferable.
- the present invention can be suitably used for circuit boards used in high-luminance light emitting devices.
- Electrode terminal portion 11 Light reflecting layer (second electrically insulating layer) 12 Light-Emitting Element 13 Electrode Pattern 15 Flattening Layer 101 Illumination Device 102 Heat Sink 103 Reflector 301 Light-Emitting Device 302 Metal Base 303 Electrode Pattern 304 Light-Emitting Element 305 Light Reflecting Resin Frame 306 Phosphor-Containing Sealing Resin 307 Anode Electrode 308 Cathode Electrode 309 Anode Mark 310 Cathode mark 311 Intermediate layer 312 Reflective layer 320 Circuit board 320A Circuit board 320B Circuit board 320C Circuit board
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Abstract
Description
以下、本発明の実施形態について、詳細に説明する。
(金属基体を用いた絶縁基板の下地準備)
まず、図1の(a)に示すように、金属基体1を用意する。次に、金属基体1上に、図1の(b)に示すように、セラミックス層2を形成する。
ここでは、上記手順で準備した絶縁基板の下地上に電極層を形成する方法について説明する。
本実施形態の変形例1として、厚みの薄い第1金属層5を形成する別の方法(溶射、AD法)について説明する。
本発明の他の実施形態について説明すれば、以下のとおりである。なお、説明の便宜上、前記実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を省略する。
(金属基体を用いた絶縁基板の下地準備)
本実施形態において、アルミニウムを金属基体1として用いた絶縁基板の下地を準備する方法は、前記実施形態1において、図1の(a)から図1の(c)に示した方法を踏襲し、ここでは説明を省略する。本実施形態に対応する図6の(a)~図6の(c)は、前記実施形態1に対応する図1の(a)~図1の(c)と同様の図を示している。
ここでは、上記手順で準備した絶縁基板の下地のうえに電極層を形成する方法について説明する。
本発明の他の実施形態について、説明すれば、以下のとおりである。なお、説明の便宜上、前記各実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を省略する。
本発明の他の実施形態について、説明すれば、以下のとおりである。なお、説明の便宜上、前記各実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を省略する。
図12の(a)は実施形態4に係る照明装置101の外観を示す斜視図であり、図12の(b)は照明装置101の断面図である。照明装置101は、発光装置301と、発光装置301から発生する熱を放熱するためのヒートシンク102と、発光装置301から出射する光を反射するリフレクタ103とを備えている。発光装置301の構成については、前記実施形態1~3において説明した発光装置と同じ構成であるため、詳細は省略する。
ここで、前記実施形態1~4で説明した回路基板における熱抵抗低減効果について以下に説明する。
本発明の態様1に係る発光装置用基板(以下、回路基板と称する)は、金属基体1と、前記金属基体1上に形成された熱伝導性を有する第1電気的絶縁層(セラミックス層2)と、前記第1電気的絶縁層(セラミックス層2)上に形成された電極パターン13と、を備えた回路基板320であって、前記電極パターン13は、前記第1電気的絶縁層(セラミックス層2)上に形成された第1金属層5からなる下地層と、前記下地層上に形成された第2金属層7からなる配線部と、前記配線部の上に形成された電極端子部10と、を有し、前記電極パターン13における前記電極端子部10が形成されていない部分の厚みは、少なくとも35μm以上であることを特徴としている。
2 セラミックス層(第1電気的絶縁層)
3 保護層
4 触媒層
5 第1金属層
6 第1マスク
6A第1マスク
7 第2金属層(配線部)
8 銀層(配線部)
9 第2マスク
9A第2マスク
10 電極端子部
11 光反射層(第2電気的絶縁層)
12 発光素子
13 電極パターン
15 平坦化層
101 照明装置
102 ヒートシンク
103 リフレクタ
301 発光装置
302 金属基体
303 電極パターン
304 発光素子
305 光反射樹脂枠
306 蛍光体含有封止樹脂
307 アノード電極
308 カソード電極
309 アノードマーク
310 カソードマーク
311 中間層
312 反射層
320 回路基板
320A 回路基板
320B 回路基板
320C 回路基板
Claims (7)
- 金属基体と、
前記金属基体上に形成された熱伝導性を有する第1電気的絶縁層と、
前記第1電気的絶縁層上に形成された電極パターンと、を備えた発光装置用基板であって、
前記電極パターンは、
前記第1電気的絶縁層上に形成された第1金属層からなる下地層と、
前記下地層上に形成された第2金属層からなる配線部と、
前記配線部の上に形成された電極端子部と、を有し、
前記電極パターンにおける前記電極端子部が形成されていない部分の厚みは、少なくとも35μm以上であることを特徴とする発光装置用基板。 - 前記第1金属層は、触媒を用いた無電解メッキ法によって形成された金属層であり、
前記第2金属層は、電解メッキ法によって形成され、前記第1金属層よりも厚い金属層であることを特徴とする請求項1に記載の発光装置用基板。 - 前記第1金属層は、金属粒子を高速で噴射させる方法によって形成された金属層であり、
前記第2金属層は、電解メッキ法によって形成され、前記第1金属層よりも厚い金属層であることを特徴とする請求項1に記載の発光装置用基板。 - 前記電極パターンの電極端子部を露出させるように、当該電極パターンと前記第1電気的絶縁層を被覆する光反射性を有する第2電気的絶縁層とを備え、
前記第1電気的絶縁層は、前記第2電気的絶縁層と同等か、それよりも高い熱伝導性を有し、
前記第2電気的絶縁層は、前記第1電気的絶縁層と同等か、それよりも高い光反射性を有することを特徴とする請求項1~3の何れか1項に記載の発光装置用基板。 - 前記電極パターンを被覆する部分における前記第2電気的絶縁層の厚みは、30μm以上であることを特徴とする請求項4に記載の発光装置用基板。
- 金属基体を備えた発光装置用基板の製造方法であって、
前記金属基体の一方側の面にセラミックス層を形成する工程と、
前記セラミックス層上に、触媒を用いて無電解メッキ法により前記セラミックス層上に金属を析出させて下地層となる第1金属層を形成する工程と、
前記第1金属層上にマスク層を形成してマスク開口部に電解メッキ法により当該第1金属層よりも厚みの厚い配線部となる第2金属層を形成する工程と、
前記マスク層を除去後、当該マスク層に覆われていた第1金属層をエッチングで除去し、所望の電極パターンを形成する工程と、を含んでいることを特徴とする発光装置用基板の製造方法。 - 金属基体を備えた発光装置用基板の製造方法であって、
前記金属基体の一方側の面にセラミックス層を形成する工程と、
前記セラミックス層上に、触媒を用いて無電解メッキ法により前記セラミックス層上に金属を析出させて下地層となる第1金属層を形成する工程と、
前記第1金属層上に電解メッキ法により当該第1金属層よりも厚みの厚い配線部となる第2金属層を形成する工程と、
前記第2金属層上にマスク層を形成してマスク開口部をエッチングすることにより、前記第1金属層と前記第2金属層から電極パターンを形成する工程と、を含んでいることを特徴とする発光装置用基板の製造方法。
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- 2015-10-20 WO PCT/JP2015/079570 patent/WO2016092956A1/ja active Application Filing
- 2015-10-20 CN CN201580064159.2A patent/CN107004752B/zh not_active Expired - Fee Related
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CN110800118B (zh) * | 2017-06-29 | 2022-10-28 | 京瓷株式会社 | 电路基板以及具备该电路基板的发光装置 |
Also Published As
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US10359181B2 (en) | 2019-07-23 |
CN107004752B (zh) | 2019-04-26 |
CN107004752A (zh) | 2017-08-01 |
US20170328545A1 (en) | 2017-11-16 |
JPWO2016092956A1 (ja) | 2017-08-17 |
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