WO2005106973A1 - 発光素子用配線基板 - Google Patents
発光素子用配線基板 Download PDFInfo
- Publication number
- WO2005106973A1 WO2005106973A1 PCT/JP2005/006727 JP2005006727W WO2005106973A1 WO 2005106973 A1 WO2005106973 A1 WO 2005106973A1 JP 2005006727 W JP2005006727 W JP 2005006727W WO 2005106973 A1 WO2005106973 A1 WO 2005106973A1
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- WIPO (PCT)
- Prior art keywords
- emitting element
- insulating substrate
- wiring board
- light
- light emitting
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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
- H01L33/642—Heat extraction or cooling elements characterized by the shape
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0201—Thermal arrangements, e.g. for cooling, heating or preventing overheating
- H05K1/0203—Cooling of mounted components
- H05K1/0204—Cooling of mounted components using means for thermal conduction connection in the thickness direction of the substrate
- H05K1/0206—Cooling of mounted components using means for thermal conduction connection in the thickness direction of the substrate by printed thermal vias
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- 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
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/31—Structure, shape, material or disposition of the layer connectors after the connecting process
- H01L2224/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
- H01L2224/321—Disposition
- H01L2224/32151—Disposition the layer 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
- H01L2224/32221—Disposition the layer 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
- H01L2224/32225—Disposition the layer 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
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- 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
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
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- 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
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48151—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
- H01L2224/48221—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
- H01L2224/48225—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
- H01L2224/48227—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 connecting the wire to a bond pad of the item
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- 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
- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/732—Location after the connecting process
- H01L2224/73251—Location after the connecting process on different surfaces
- H01L2224/73265—Layer and wire connectors
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- 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
- H01L2924/013—Alloys
- H01L2924/0132—Binary Alloys
- H01L2924/01322—Eutectic Alloys, i.e. obtained by a liquid transforming into two solid phases
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- 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
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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
- H01L33/483—Containers
- H01L33/486—Containers adapted for surface mounting
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0306—Inorganic insulating substrates, e.g. ceramic, glass
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10007—Types of components
- H05K2201/10106—Light emitting diode [LED]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
- H05K3/4038—Through-connections; Vertical interconnect access [VIA] connections
- H05K3/4053—Through-connections; Vertical interconnect access [VIA] connections by thick-film techniques
- H05K3/4061—Through-connections; Vertical interconnect access [VIA] connections by thick-film techniques for via connections in inorganic insulating substrates
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/46—Manufacturing multilayer circuits
- H05K3/4611—Manufacturing multilayer circuits by laminating two or more circuit boards
- H05K3/4626—Manufacturing multilayer circuits by laminating two or more circuit boards characterised by the insulating layers or materials
- H05K3/4629—Manufacturing multilayer circuits by laminating two or more circuit boards characterised by the insulating layers or materials laminating inorganic sheets comprising printed circuits, e.g. green ceramic sheets
Definitions
- the present invention relates to a light emitting element wiring board for mounting a light emitting element such as a light emitting diode (LED).
- a light emitting element such as a light emitting diode (LED).
- LEDs LEDs mounted on a wiring board
- this type of light emitting device is used as a display light source, not for illumination, because it emits less light than incandescent lamps and fluorescent lamps.
- Such light-emitting devices mainly employ a so-called shell-type mounting structure in which a light-emitting element (LED) is embedded in a resin insulating substrate because of a small amount of electricity and a small amount of heat generation (see Patent Document 1). ).
- Patent Document 1 Japanese Unexamined Patent Application Publication No. 2000-2012
- Patent Document 2 JP-A-11-111
- Patent Document 3 Japanese Unexamined Patent Application Publication No. 2003-34067
- a wiring substrate used for a light emitting element has a structure in which a conductor layer is provided on the surface or inside of a flat insulating substrate, and the light emitting element is mounted on one surface of the insulating substrate.
- Insulating substrate used in such a wiring board many are made of alumina, the thermal expansion coefficient of this ⁇ Lumina made of an insulating substrate is a 7. 0 X 1 0- 6 Z ° about C, printed circuit board Since the difference in thermal expansion coefficient between these two is not a problem in practical use, the connection reliability between them is excellent.
- alumina has a low thermal conductivity of about 15 WZm.K
- aluminum nitride which has a high thermal conductivity, has begun to attract attention as an alternative.
- a resin insulating substrate has a thermal expansion coefficient close to that of a printed circuit board, so there is no problem with the mounting reliability of the printed circuit board.However, the thermal conductivity is very low, 0.05 Wm'K. There is a problem that the problem of heat cannot be dealt with at all, and when the device is used for a long time in the near-ultraviolet wavelength band, the insulating substrate is blackened and the luminance of the light emitting element is reduced.
- a wiring board for a light-emitting element that is inexpensive, has excellent heat conduction, and has excellent mounting reliability has not yet been provided.
- an object of the present invention is to provide a wiring board for a light emitting element which is inexpensive and has excellent heat dissipation and mounting reliability.
- Another object of the present invention is to provide a light emitting device in which a light emitting element is mounted on the wiring board.
- a ceramic insulating substrate and a conductor layer formed on the surface or inside of the insulating substrate, and has a mounting area for mounting a light emitting element on one surface of the insulating substrate.
- the light emitting element wiring board
- the insulating substrate is provided with a heat conductive columnar conductor having a higher thermal conductivity than the insulating substrate,
- the light emitting element wherein the heat conductive columnar conductor extends from the light emitting element mounting region of the insulating substrate in a thickness direction of the insulating substrate and is formed by simultaneous firing with the insulating substrate.
- Wiring board is provided.
- the heat conductive columnar conductor having higher thermal conductivity than the insulating substrate is provided through the insulating substrate, the heat generated from the light emitting device can be quickly wired. Dissipated outside the substrate. Therefore, excessive heating of the light emitting element is effectively suppressed, and it is possible to prevent a decrease in the luminance of the light emitting element or to increase the luminance of the optical element.
- the insulating substrate is made of ceramics, it has a higher thermal conductivity than the resin mold substrate, and the insulating substrate itself has excellent heat dissipation, and furthermore, the heat generated by the light source or the light from the light source. No change in molecular structure occurs over a long period of time, and there is little change in color tone (blackening, etc.) or deterioration of characteristics, and high reliability.
- the insulating substrate can be formed by firing at an arbitrary temperature.
- a high-temperature fired insulating substrate having a firing temperature higher than 150 ° C. it is necessary to increase the thermal conductivity.
- a low-temperature fired insulating substrate having a firing temperature of 150 ° C. or lower a wiring layer made of a low-resistance conductor such as gold, silver, or copper can be formed by simultaneous firing. It is advantageous.
- the surface of the insulating substrate on the light emitting element mounting region side preferably has a total reflectance of 70% or more, whereby light emitted from the light emitting element transmits through the insulating substrate or is transmitted to the insulating substrate. Absorption can be prevented, and luminous efficiency can be increased.
- the heat conductive columnar conductor extends from a region where the light emitting element is mounted so as to penetrate the insulating substrate in order to quickly dissipate heat generated in the light emitting element. It preferably has a larger plane cross-sectional area than the light-emitting element mounting surface (corresponding to the bottom surface of the light-emitting element). As a result, the heat dissipating portion increases, and the heat from the light emitting element can be more quickly dissipated.
- a boundary between the end surface of the heat conductive columnar conductor and the surface of the insulating substrate and the vicinity thereof is covered with a boundary protection layer formed of at least one selected from the group consisting of metals, ceramics and resins. Is preferred.
- the end face (the end face on the upper side) on the mounting area side of the heat conductive columnar conductor and its peripheral portion are covered with a coating layer containing a metal or a resin. It is preferable that the end face on the side opposite to the mounting area side (the end face on the lower side) and its peripheral portion are covered with a coating layer containing at least one selected from the group consisting of metal, ceramics and resin.
- the heat conductive columnar conductor has a thermal conductivity of 80 WZm * K or more, since heat generated from the light emitting element can be quickly dissipated.
- the heat conductive columnar conductor is formed of a metal material and a ceramic material.
- a metal-ceramic columnar conductor makes it easy to control, for example, the coefficient of thermal expansion, and by bringing the coefficient of thermal expansion closer to that of the insulating substrate, cracks occur due to thermal expansion mismatch with the insulating substrate. Can be suppressed. Further, the bonding strength between the columnar conductor and the insulating substrate can be increased, which is advantageous in performing simultaneous firing with the insulating substrate.
- the heat conductive columnar conductor can be incorporated in a part of an electric circuit. In this case, no conductive terminal is required, which is advantageous in miniaturizing the light emitting element wiring board.
- the heat conductive columnar conductor may be formed of a plurality of layers having different coefficients of thermal expansion or thermal conductivity.
- the thermal expansion coefficient and the thermal conductivity of each layer are changed, and for example, the thermal expansion of the layer on the mounting region side with the light emitting element mounted thereon is changed. If the difference is reduced, the lower layer can have a high thermal conductivity regardless of the coefficient of thermal expansion, and the heat dissipation can be enhanced while ensuring reliability.
- 1 (a) and 1 (b) are cross-sectional views each showing an example of a typical structure of a wiring board for a power generating element of the present invention.
- FIG. 2 is a cross-sectional view showing another example of the light emitting element wiring board of the present invention.
- 3 (a) and 3 (b) are cross-sectional views showing still another example of the light emitting element wiring board of the present invention.
- FIG. 4 is a view showing a preferred example of the side surface shape of the heat conductive columnar conductor formed on the light emitting element wiring board of the present invention.
- FIG. 5 is a view showing a conductor layer provided when a step is formed on the side surface of the heat conductive columnar conductor.
- FIG. 6 is a diagram for explaining an example of a method of incorporating a columnar conductor into an insulating substrate in the light emitting element wiring board of the present invention.
- FIG. 7 is a view for explaining another example of a method of incorporating a columnar conductor into an insulating substrate in the light emitting element wiring board of the present invention.
- FIG. 8 is a diagram showing a cross-sectional structure of a light emitting device in which a light emitting element is mounted on the light emitting element wiring board of FIG.
- FIGS. 1 (a) and 1 (b) showing a typical structure of a wiring board for a light emitting element of the present invention
- the wiring board indicated by 11 as a whole is a ceramic insulating board 1 and an insulating board 1.
- Conductor layers (connection terminals) 3a, 3b formed on one surface 1a, conductor layers (external electrode terminals) 5 formed on the other surface 1b of insulating substrate 1, and these conductor layers 3 Via conductors 7 are provided penetrating insulating substrate 1 so as to electrically connect a and 3 b to conductor layer 5.
- a mounting area 9 for mounting a light emitting element described later is formed between the one conductor layer 3a and the other conductor layer 3b. That is, the conductor layers 3 a and 3 b are electrically connected to the light-emitting elements (not shown in FIGS. 1 (a) ′ (b)) mounted on the mounting area 9, respectively, as connection terminals. function To do.
- the conductor layer 5 is electrically connected to an external circuit board such as a printed board, and functions as an external electrode terminal. Therefore, as described later, the power generation element mounted on the mounting area 9 is electrically connected to the external circuit board via the conductor layers 3a and 3b, the via conductor 7, and the conductor layer 5. . Therefore, in the following description, the conductor layers 3a and 3b are called connection terminals, and the conductor layer 5 is called an external electrode terminal.
- connection terminals 3a and 3b and the external electrode terminal 5 are formed of various metals, but are generally formed of at least one of W, Mo, Cu, and Ag. Has been established.
- connection terminals 3a and 3b and the external electrode terminals 5 are formed of such a metal material, it is advantageous in performing simultaneous firing with the insulating substrate 1, and is inexpensive and quickly performed. Can be produced.
- a frame 13 for accommodating a mounted light emitting element is provided so as to surround the mounting area 9 and the conductor layers 3a and 3b. You can also. With such a frame 13, the light emitting element mounted on the mounting area 9 can be protected, and a phosphor or the like can be easily arranged around the light emitting element. Further, light emitted from the light emitting element can be reflected by the frame body 13 and guided in a predetermined direction.
- the total reflectance of the inner wall surface is 70 o / o or more, particularly 80% or more, and most preferably 85%. Is suitable for suppressing absorption and ensuring high luminance.
- the heat conductive columnar conductor 10 is formed of a material having a higher thermal conductivity than the ceramics forming the insulating substrate 1, specifically, a metal such as W, Mo, Cu, Ag, or the like. (It may be formed by a composite of metal and ceramic, as described later.) As shown in FIGS. 1 (a) and 1 (b), the surface from the mounting area 9 to the opposite side of the insulating substrate 1 It extends through the insulating substrate 1 in the thickness direction to 1b.
- the heat conductive columnar conductor 10 is formed by simultaneous firing with the insulating substrate 1.
- the columnar conductor 10 having a higher thermal conductivity than the insulating substrate 1 extends from the mounting area 9 through the insulating substrate 1. Therefore, the heat generated from the light emitting element can be quickly dissipated by using the columnar conductor 10 as a heat transfer path. As a result, the light emitting element can be prevented from being excessively heated, and the luminance of the light emitting element can be reduced. Can be prevented.
- such a columnar conductor 10 is a large-diameter block with a diameter of 500 m or more, and one or more It is arranged so that the end face is located in the mounting area 9.
- the planar cross-sectional shape of such a columnar conductor 10 may be any of a circle, an ellipse, a square, a polygon, and the like.
- Such a large-diameter block-shaped columnar conductor 10 is fitted into a ceramic green sheet by pushing a conductor sheet prepared using a conductor slurry for the columnar conductor 10 into the ceramic green sheet so as to penetrate the ceramic green sheet. It is formed by simultaneously firing the composite molded bodies thus produced (this method will be described later in detail).
- Such a block-shaped columnar conductor 10 has a size similar to, for example, a light emitting element to be mounted, for example, has a diameter exceeding 1 OOO im, and is smaller than a so-called thermal via. A remarkably high heat dissipation can be realized.
- the cross-sectional area of the block-shaped columnar conductor 10 (the area of the end face on the mounting area 9 side) is determined by the mounting area of the light emitting element mounted on the wiring board 11 ( (Equivalent to the bottom area), for example, preferably 1.1 times or more, more preferably 1.2 times or more, the mounting area of the light emitting element.
- the heat radiation portion increases, and the heat generated from the light emitting element can be more quickly dissipated. Since the columnar conductor 10 shown in FIGS. 1A and 1B has conductivity, it can be incorporated in a part of an electric circuit.
- connection terminals 3 a and 3 b and the via conductor 7 are not required, and the light emitting element wiring board 11 is downsized. Can be planned.
- the heat conductive columnar conductor 10 is provided independently of an electric circuit, there is no electrical connection between the heat conductive columnar conductor 10 and an external circuit board such as a printed circuit board. The mounting reliability is improved.
- the above-described columnar conductor 10 has a higher thermal conductivity than the insulating substrate 1, and particularly has a thermal conductivity of 8 O WZm ⁇ K or more, preferably It is preferably in the range of 10 OW / m ⁇ K or more, more preferably 12 OW / m ⁇ K or more, and most preferably 16 OW / m-K or more.
- the thermal conductivity of such a columnar conductor 10 can be controlled by appropriately selecting the type of metal forming it. For example, by forming the columnar conductor 10 using Cu or Cu—W having a high thermal conductivity, the thermal conductivity of the columnar conductor can be increased, and the high thermal conductivity as described above is secured.
- the content of Cu in the columnar conductor 10 is desirably 40% by volume or more, preferably 50% by volume or more, and more preferably 60% by volume or more.
- the thermal expansion coefficient (40 to 400 ° C) of the columnar conductor 10 is determined by the coefficient of thermal expansion of the insulating substrate 1. It is desirable that the thermal expansion coefficient difference Of of the insulating substrate 1 and the columnar conductor 10 be 4.0 X 10 _ 6 Z ° C or less, and preferably 2.0 X 10 — 6 Z ° C or less, and most preferably 1. 0 X 1 0- 6 so that the Z ° C or less, good coefficient of thermal expansion of the columnar conductors 1 0 is adjusted. This is because by preventing the thermal expansion mismatch between the two, it is possible to obtain a highly reliable wiring substrate 11 for a light emitting element.
- the coefficient of thermal expansion of the columnar conductor 10 can be adjusted by appropriately selecting the type of metal and the like.For example, Cu having a high thermal conductivity and W having a relatively low coefficient of thermal expansion among metals. By using these in combination, it is possible to form the columnar conductor 10 having high thermal conductivity and having a controlled difference in thermal expansion coefficient from the insulating substrate 1. Also, by forming the columnar conductor 10 from a composite of a metal and a ceramic, the difference in thermal expansion coefficient between the two can be adjusted.
- the above-described columnar conductor 10 is prepared by mixing a predetermined metal powder (for example, the above-mentioned Cu or W powder) with an appropriate amount of an organic binder and an organic solvent.
- a predetermined metal powder for example, the above-mentioned Cu or W powder
- the mixed powder of the above metal powder and ceramic powder for example, ceramic powder for forming the insulating substrate 1
- an organic binder and an organic solvent May be done.
- ceramic green Simultaneous firing with the sheet can provide high bonding strength between the columnar conductor 10 and the insulating substrate 1, and the columnar conductor 10 is formed of a composite of metal and ceramic.
- the ceramic powder content in the mixed powder (corresponding to the ceramic content in the columnar conductor 10) is usually 5% by volume or less, particularly 4% by volume or less, and most preferably 3% by volume or less in order to secure high thermal conductivity. It is good to be below. Of course, it is most preferable to use ceramics used for forming the insulating substrate 1 as such ceramics. Further, in the present invention, as shown in FIG.
- a boundary protection layer 15 covering the boundary between the end face of the columnar conductor 10 and the insulating substrate 1 and the vicinity thereof can be provided.
- the boundary protection layer 15 is formed using at least one of metal, ceramics, and resin.
- the composition of the boundary protection layer 15 can be appropriately changed in consideration of the difference in thermal expansion between the columnar conductor 10 and the insulating substrate 1 .
- the boundary protection layer 15 is formed of metal or ceramics.
- the boundary protection layer 15 can be provided by simultaneously firing the insulating substrate 1 and the columnar conductor 10. It is desirable that the above ceramics have the same composition as the ceramics used for forming the insulating substrate 1 from the viewpoints of sinterability and adhesion between the boundary protection layer 15 and the insulating substrate 1.
- a metal having the same composition as that of the columnar conductor 10 as the above-mentioned metal, sinterability and adhesion between the boundary protection layer 15 and the columnar conductor 10 can be improved.
- the insulating substrate 1 is made of alumina is a ⁇ Lee Ya 1 ⁇ 1 0, it is desirable to use as the metal for the boundary protective layer. If the boundary protection layer 15 is formed using metal, It is desirable to use a combination of sintering and sintering behaviors and the coefficient of thermal expansion. .
- boundary protection layer 15 When a resin is used as the boundary protection layer 15, after forming the insulating substrate 1 and the columnar conductor 10 by simultaneous firing, the resin is printed so as to close the boundary between the insulating substrate 1 and the columnar conductor 10.
- the boundary protection layer 15 can be formed by performing a hardening treatment or the like.
- the water resistance and heat dissipation of the boundary protection layer 15 can be improved by adding 10 to 50% by volume of ceramic powder in addition to the resin component. Can be improved.
- the boundary protection layer 15 described above may have a laminated structure composed of layers of different materials. For example, if a resin layer is laminated on a layer formed of metal or ceramics to form the boundary protection layer 15, a crack may occur at the boundary between the insulating substrate 1 and the columnar conductor 10. Even if it does, cracks can be prevented from spreading to the surface layer, and thus such a laminated structure is most preferable.
- 3 (a) and 3 (b) showing another example of the light emitting element wiring board 11 of the present invention.
- the coating layer 16a is formed so as to completely cover the end face of the heat conductive columnar conductor 10 on the side where the mounting area 9 is formed and the peripheral edge thereof. Can be provided.
- the coating layer 16a provided on the upper end face contains a resin or a metal.
- the heat conductivity of the covering layer 16a is higher than that of the insulating substrate 1, so that the heat from the light emitting element 21 can be quickly consumed. Can be released.
- a resin is used as the coating layer 16a, short-circuit between the columnar conductor 10 and the connection terminals 3a and 3b can be prevented.
- the covering layer 16b is formed so as to completely cover the end face of the columnar conductor 10 located on the side opposite to the side where the mounting area 9 is formed and the peripheral edge thereof. Can also be provided.
- the coating layer 16b provided on the lower end face contains at least one selected from the group consisting of metal, ceramics and resin, and is provided with such a coating layer 16b. Accordingly, the difference in thermal expansion between the columnar conductor 10 and the insulating substrate 1 can be reduced, and the occurrence of cracks at the boundary between the end surface of the columnar conductor 10 and the insulating substrate 1 can be suppressed.
- the covering layer 16b when the covering layer 16b is formed using a metal, the heat conductivity of the covering layer 16b is higher than that of the insulating substrate 1, so that the heat from the light emitting element 21 is quickly consumed. Can be released.
- ceramics or resin is used as the coating layer 16b, short-circuit between the columnar conductor 10 and the external terminal 5 can be prevented.
- the coating layer 16b is formed of ceramics, simultaneous sintering with the insulating substrate 1 and the columnar conductor 10 is possible, which is advantageous in terms of productivity.
- the wiring board 1 when the coating layer 16a made of resin is provided on the upper surface and the coating layer 16b formed of ceramics or resin is provided on the lower surface, the wiring board 1 When a light-emitting device having the light-emitting element 21 mounted on 1 is mounted on a printed circuit board or the like, wiring can be arranged directly below the columnar conductors 10, which is advantageous in terms of miniaturization of equipment.
- the above-mentioned coating layers 16a and 16b can be easily formed by applying a coating liquid containing a metal or ceramics or a resin containing a resin to the corresponding portions and baking or baking.
- the same metals or ceramics as those used for forming the above-described boundary protection layer 15 can be used for forming the coating layers 16a and 16b.
- the side surfaces of the above-described columnar conductors 10 are made to be inclined surfaces, or steps are formed on the side surfaces, so that the columnar conductors 10 (particularly large-diameter block-shaped 0) and the insulating substrate 1 can be strengthened, and the columnar conductor 10 can be firmly incorporated into the insulating substrate 1.
- the side surface of the columnar conductor 10 is an inclined surface 10a, the contact area between the columnar conductor 10 and the insulating substrate 1 can be increased, thereby Thus, the bonding strength between the insulating substrate 1 and the columnar conductor 10 is increased.
- the end surface on the mounting area 9 side of the columnar conductor 10 is formed smaller than the other end surface.
- the side surface is an inclined surface, but it is of course possible to form the end surface on the mounting region 9 side of the columnar conductor 10 larger than the other end surface to form the inclined surface.
- a step 10 b can be formed on the side surface of the columnar conductor 10. That is, also in this case, the contact area between the columnar conductor 10 and the insulating substrate 1 is increased as compared with the case where the side surface of the columnar conductor 10 has a straight shape. The joining strength between 1 and the columnar conductor 10 is improved.
- the end face on the mounting area 9 side of the columnar conductor 10 is formed smaller than the other end face.
- the end face on the mounting area 9 side of the columnar conductor 10 on the other side is formed. It is also possible to form a step by making it larger than the end face. However, from the viewpoint of heat dissipation, it is preferable that the end face on the mounting area 9 side of the columnar conductor 10 is formed smaller than the other end face to form the step 10b.
- one step 10b is formed on the side surface of the columnar conductor 10, but as shown in FIG. 4 (c), a plurality of steps 10b are formed. You can do it. That is, in FIG. 4 (c), two steps 10b are formed on the side surface of the columnar conductor 10, and thereby, the convex portion 1Oc is formed on the side surface of the columnar conductor 10. It has been done. Therefore, not only does the contact area between the columnar conductor 10 and the insulating substrate 1 increase, but also the side surface of the columnar conductor 10 and the insulating substrate 1 come into tight contact with each other. The strength is significantly increased. Further, in FIG.
- the convex portion 10c is formed on the side surface by the two steps 10b, but the concave portion may be formed on the side surface by the two steps 10b. It is possible. However, from the viewpoint of heat dissipation, it is preferable to form the convex portion 10c.
- the length of the step 10 is generally 100 OO jUm or more, particularly 200 ⁇ m or more, from the viewpoint of increasing the bonding strength. Preferably.
- the plane sectional area of the columnar conductor 10 (particularly, the area of the end surface on the mounting area 9 side) is larger than the mounting area of the light emitting element to be mounted. It is preferable in that high heat dissipation can be ensured.
- a step 10b is formed on the side surface of the columnar conductor 10
- the conductor layer 14 be drawn out from 10b. That is, when the step 10 b is formed on the side surface of the columnar conductor 10, the stress generated due to the difference in thermal expansion between the insulating substrate 1 and the columnar conductor 10 is such a step 1.
- the formation of the conductor layer 14 alleviates the concentration of stress in the vicinity of the step 10b and effectively suppresses the occurrence of cracks. Further, such a conductor layer 14 is formed of the same material as that of the columnar conductor 10, and thus has an advantage that the heat dissipation is further improved.
- the insulating substrate 1 when a step 10 b is formed on the side surface of the columnar conductor 10, the insulating substrate 1 usually has a laminated structure in which a plurality of insulating layers are laminated (in FIG. 5, the insulating layer 1a, 1b) and a step 10b is formed at the lamination interface of the insulating layers 1a, 1b (refer to the method of forming the columnar conductor 10 described later). ). Therefore, the conductor layer 14 extends from the edge of the step 10b along the lamination interface of the insulating layers 1a and 1b.
- the protruding length w of the step 10 b of the conductor layer 14 from the edge of the step 10 b is more than 50 / m, particularly more than 200 / m, and is most preferable in order to secure sufficient stress relaxation. Should be 400 m or more.
- the conductor layer 14 is formed of the same material as the columnar conductor 10, as shown in FIG. 5, the conductor layer 14 penetrates the columnar conductor 10 so as to cross the columnar conductor 10. May extend.
- FIG. 5 shows a case where the conductor layer 14 is formed when one step 10 b is formed on the side surface of the columnar conductor 10 as shown in FIG. 4 (b).
- FIG. 4 (c) when a plurality of steps 10b are formed as shown in FIG. 4 (c), it is preferable to draw out the conductor layer 14 from each of the plurality of steps 10b.
- the insulating substrate 1 is made of ceramic.
- such an insulating substrate 1 has a thermal conductivity of 3 O WZ m ⁇ K or more, preferably 35 W / m ⁇ K. It is preferably at least 4 OW / m ⁇ K, more preferably at least 45 WZm′K.
- an insulating substrate with a thermal conductivity of 30 WZm ⁇ K or more can be manufactured.
- An insulating substrate 1 having a rate of 40 Wm ⁇ K or more can be manufactured.
- the total reflectance of the insulating substrate 1 is 70% or more, preferably 72% or more, more preferably 80% or more, and most preferably 83 o / o or more.
- the element wiring board 11 can be obtained.
- an insulating substrate 1 having a high reflectivity of 83% or more is manufactured by using pure or high-purity alumina or 990/0, the Y 2 0 3 is M g Omicron added as sintering aids be able to.
- the three-point bending strength of the insulating substrate 1 is preferably 350 MPa or more, particularly 400 MPa or more, and most preferably 45 OMPa or more.
- the high-strength insulating substrate 1 it is possible to prevent the substrate from being cracked due to stress when the light emitting device having the light emitting element mounted on the wiring substrate 11 is mounted on an external circuit substrate such as a print substrate.
- Such a high-strength insulating substrate 1 is made of alumina or MgO as a ceramic material. Can be obtained.
- the ceramic material used for forming the insulating substrate 1 should be selected in consideration of the above-described thermal conductivity, thermal expansion coefficient, and other physical properties.
- an insulating substrate 1 made of 1 ⁇ 1 ⁇ 0 is made of a MgO-based sintered body having MgO as a main crystal phase, and has a coefficient of thermal expansion (room temperature to 400 ° C) of 10%.
- 1/180 sintered body having 00 as the main crystal phase is, for example, such that the peak of M g O is detected as the main peak by X-ray diffraction. It is desirable to contain O crystals in a volume ratio of 50% by volume or more.
- a rare earth oxide e.g., Y 2 0 3, Y b 2 0 3
- the amount of additional components, such as sintering aids, used to obtain a dense sintered body containing MgO as the main crystal, should be 3% by mass or more in the mixed powder in order to lower the firing temperature. It is particularly preferable that the content be 5% by mass or more, and from the viewpoint of precipitating a large amount of MgO crystals, the amount of the additive should be 30% by mass or less, particularly 20% by mass or less in the mixed powder. It is desirable. In particular, when the amount of the additive is set to 10% by mass or less, most of the obtained insulating substrate 1 can be formed by MgO crystals.
- the insulating substrate 1 made of alumina is made of a AI 2 0 3 quality sintered body of AI 2 0 3 as a main crystal phase, in particular in addition to the above-described characteristics, advantages there Ru that is inexpensive.
- AI 2 0 3 quality sintered body of AI 2 0 3 as a main crystal phase for example, by X-ray diffraction, AI. 0 3 is such that the peak is detected as the main peak,
- the crystals of AI 2 0 3 desirably contains more than 50 vol%.
- such alumina insulating substrate 1 for example, an average particle diameter of 1.0 to 2.0 ⁇ M AI 2 O 3 powder having a purity of 99% or more, M n 2 0 3, S i 0 2, It is molded using a mixed powder to which at least one sintering aid powder (average particle size: 1.0 to 2.0 m) selected from the group consisting of MgO, SrO, and CaO is added. It is obtained by firing the ceramic Darrieen sheet in a temperature range of 1 050 ° C or higher and 1300-1500 ° C.
- the amount of additives such as sintering aids in the mixed powder used for molding the ceramic sheet is determined from the viewpoint of lowering the firing temperature. It is preferably at least 7% by mass, particularly preferably at least 7% by mass. From the viewpoint of obtaining a dense sintered body of the AI 2 0 3 as a main crystal, the amount of the additive in the mixed powder is 1 to 5% by weight, and especially 1 is 0 mass% or less good preferred, thereby, a large part of the insulating substrate 1 obtained can you to form the AI 2 0 3 crystals.
- the insulating substrate 1 made of MgO and alumina was described, but the insulating substrate 1 used in the present invention is not limited to these, and ceramics such as mullite, spinel, and forsterite are used. It is also possible to use a sintered body having a main crystal such as Further, the insulating substrate 1 can be formed of so-called glass ceramics. Such a glass-ceramic insulating substrate 1 can be manufactured by firing at a low temperature of 1 050 ° C or less. In particular, the connection terminals 3a and 3b, the external electrode terminals 5, the via conductors 7, etc. In the case where the insulating substrate 1 is formed of a low-resistance conductor such as Cu or the like, co-firing is advantageous in that the insulating substrate 1 having a dense and smooth surface can be obtained.
- a low-resistance conductor such as Cu or the like
- Such glass-ceramic insulating substrate 1 for example using a mixed powder of S ⁇ 0 2 powder of which filler powder to the glass powder, by molding a ceramic green sheet in the same manner as described above, 1 050 ° C or less, in particular 850 ° It can be manufactured by firing at a temperature of C to 1,050 ° C.
- the filler content in the mixed powder varies depending on the composition of the glass and the like. However, in order to produce a high-strength insulating substrate 1, it is usually in the range of 30 to 60 mass% 0 / o, and particularly in the range of 35 to 55 mass%. It is good to have.
- molding of the ceramic green sheet one Bok of using raw material mixed powder can be carried out in a manner known per se, for example, M g O or AI 2 0
- a binder, a solvent, and the like are added to a mixed powder containing a ceramic material such as 3 to form a molding slurry, and the slurry is used to form a sheet-like molded body by a means such as a doctor blade method.
- a certain ceramic green sheet can be obtained.
- a through hole corresponding to the via conductor 7 is formed at a predetermined position in the ceramic green sheet by laser processing or the like, and the metal powder is dispersed in an appropriate binder and solvent.
- the conductive paste is filled in the through-holes, and a conductive paste is printed in a predetermined shape on the surface of the ceramic green sheet in a pattern shape corresponding to the connection terminals 3a, 3b and the external electrode terminals 5.
- connection terminals 3a and 3b and the external electrode terminals 5 can be formed directly on the surface of the insulating substrate 1 by transferring a metal foil to a ceramic green sheet or by a thin film forming method such as vapor deposition. .
- the conductor pattern corresponding to the columnar conductor 10 can be incorporated into the ceramic green sheet as follows.
- a through hole is formed at a predetermined position on the green sheet as in the case of forming the via conductor 7, and this through hole is formed.
- the conductor pattern for the columnar conductor 10 can be incorporated into the ceramic green sheet.
- FIG. 1 (b) When the columnar conductor 10 has the block shape shown in FIG. 1 (b), the conductor sheet corresponding to the columnar conductor 10 is pushed into a predetermined position of the ceramic green sheet and fitted.
- a conductor pattern for the columnar conductor 10 can be incorporated.
- FIG. 6 shows an example of a method for forming such a conductor pattern.
- a mold 3 9 having a punched hole 37 The ceramic green sheet 40 is arranged on the upper surface of the substrate.
- the conductor sheet 43 for the columnar conductor 10 is overlaid on the ceramic green sheet 40 . It is desirable that the conductor sheet 43 has substantially the same thickness as the ceramic green sheet 40.
- the conductor sheet 43 is made of a conductor slurry prepared by mixing the above-mentioned metal powder for forming the columnar conductor 10 (or a mixed powder of the metal powder and the ceramic powder) with an organic binder and a solvent. It is made by sheet forming such as doctor blade method.
- the conductor sheet 43 is pressed into the ceramic green sheet 40 with a pressing mold 35. As a result, a part of the conductive sheet 43 is inserted and fitted into the ceramic green sheet 43.
- a composite sheet 50 in which a part of the conductor sheet 43 is incorporated so as to penetrate a part of the ceramic green sheet 40 can be formed. That is, FIG. 6 (d)
- the conductor sheet 43 fitted in the composite sheet 50 becomes a conductor pattern corresponding to the columnar conductor 10, and such a composite sheet (green sheet) 50 is placed first.
- a conductor pattern corresponding to the connection terminals 3a, 3b, the external electrode terminals 5, or the via conductors 7 is formed, and is fired in this state.
- a composite sheet 50a incorporating the circuit board 43 and a composite sheet 50b incorporating the large-diameter conductor sheet 50 are produced according to the above-described method.
- the laminates 50a and 50b are pressed together to produce a laminate.
- the end of the portion where the small-diameter conductor sheet 43 formed on the composite sheet 50a and the large-diameter conductor sheet 43 formed on the composite sheet 50b face each other.
- Step 10 b formed in the part Therefore, by firing this laminate, the columnar conductor 10 having the shape shown in FIG. 4B can be formed in the insulating substrate 1.
- the insulating substrate 1 has a laminated structure in which two insulating layers are laminated. Further, when the conductor layer 14 as shown in FIG. 5 is formed, a conductor is provided at the lamination interface of the composite sheet 50 a or the composite sheet 50 b so as to correspond to the conductor layer 14.
- the paste may be applied by screen printing or the like.
- a large-diameter conductor sheet 43 is incorporated.
- a three-layered laminate may be produced by sandwiching the composite sheet 5Ob between two composite sheets 50a (in which the small-diameter conductor sheet 43 is incorporated), and the laminate may be fired.
- the manufactured insulating substrate 1 has a laminated structure including three insulating layers.
- a laminated body of the composite sheet 50 is manufactured in order to form the columnar conductor 10 having the step 10 b, but the columnar shape having no step 10 b is formed.
- the conductor 10 it is of course possible to produce a laminate of the composite sheet 50 and fire it.
- the compositions of the conductor sheets 43 in each composite sheet 50 to be different from each other, it is possible to form the columnar conductor 10 composed of a plurality of layers having different thermal expansion coefficients and thermal conductivity.
- a first composite sheet embedded with a conductor sheet composed of Cu: 40% by volume and W: 60% by volume, and a conductor sheet composed of Cu: 50% by volume and W: 50% by volume are embedded.
- the layer derived from the conductor sheet of the composite sheet (mounting area 9 side) has a low coefficient of thermal expansion and a small difference in thermal expansion coefficient from the mounted light emitting element.
- the layer derived from the conductive sheet (the side opposite to the mounting area 9) has a high thermal expansion coefficient but a high thermal conductivity. As can be understood from this, if the layer on the mounting area 9 side is a layer having a small thermal expansion coefficient, the layer on the opposite side to the mounting area 9 has a high thermal conductivity without considering the thermal expansion coefficient.
- the exposed surface of the conductor sheet 43 (corresponding to the end surface of the columnar conductor 10) in the composite sheet 50 (or in the laminate of the composite sheet 50), and the green sheet 40 and the conductor sheet A paste containing a metal, such as Mo paste, is applied to the interface of 3 by screen printing or the like, and is baked to form the coating layers 16 a and 1 b shown in FIGS. 3 (a) and (b). 6b can be formed on the upper end face or the lower end face of the columnar conductor 10.
- a metal such as Mo paste
- a boundary protective layer 15 is formed by applying a paste having the same composition as that of the above-mentioned dull sheet 40 to a predetermined position of the composite sheet in the same manner as the above-mentioned metal paste. Then, it is formed by firing. Further, when the coating layers 16a and 16b and the boundary protection layer 15 are formed by using a resin, after baking the composite sheet, a coating solution containing the resin is applied to a predetermined position, and then dried and dried. Curing may be performed. The above-described firing of the ceramic green sheet (or the composite sheet) is performed by heating to a predetermined firing temperature in an oxidizing atmosphere, a reducing atmosphere, or an inert atmosphere after debinding. In particular, when a material that is easily oxidized such as Cu is used as the metal powder, firing is performed in a reducing atmosphere or an inert atmosphere.
- connection terminals 3a, 3b, the external electrode terminals 5, and the columnar conductor 10 are plated with AI, Ag, or the like to improve the reflectance of these members. And increase the brightness.
- high reflectivity is obtained by forming a plating layer in the order of nickel, gold, and silver on the metallized metal formed on the connection terminals 3a, 3b, the columnar conductor 10, and the inner wall 13a of the frame.
- the silver-plated layer can be firmly fixed. In particular, if such a silver-plated layer is formed on the inner wall surface 13a of the frame, light from the light emitting element is reflected at a high reflectance on the inner wall surface 13a of the frame and emitted to the outside. .
- the frame 13 for protecting the mounted light emitting element is formed of a ceramic material or a metal material.
- the frame 13 is simultaneously fired. Since the frame 13 can be formed together with the insulating substrate 1, the connection terminals 3a and 3b, the external electrode terminals 5, the columnar conductors 10, and the like, this is advantageous in terms of productivity. In addition, since such a ceramic frame 13 is excellent in heat resistance and moisture resistance, there is an advantage that it exhibits excellent durability even when used for a long time or under bad conditions. . Further, the inner wall surface 13a of such a ceramic frame 13 is simultaneously fired using the conductor paste used for forming the connection terminals 3a and 3b described above, so that a metallized layer (see FIG. (Not shown) can further improve durability and reflectivity.
- a plating layer made of Ni, Au, Ag, or the like can be formed on such a metallized layer.
- a frame By forming such a metallized layer or a plating layer, a frame can be formed.
- the total reflectance on the inner wall 13a of 13 can be adjusted to 7 Oo / o or more, especially 80% or more, and most preferably 850/0 or more.
- the transmission and absorption of light can be suppressed, and high brightness can be realized.
- the inner wall surface 13a of the frame body 13 having a high reflectance of 85% or more can be realized by applying bright Ag plating.
- the metal frame 13 has the advantage of having a high reflectivity by itself, and AI, Fe—Ni—Co alloy, or the like can be used as such a metal. It is suitable in that it is inexpensive and has excellent workability.
- a plating layer (not shown) made of Ni, Au, Ag, or the like can be formed on the inner wall surface 13a of the metal frame 13 in the same manner as described above. By forming the layer, the total reflectance of the inner wall surface 13a can be further increased, and for example, a total reflectance of 85% or more can be realized.
- Such a metal frame 13 is formed, for example, by previously forming a conductor layer 17 on the surface 1 a of the insulating substrate 1 obtained by the above-described firing, and then forming the conductor layer 17 and the frame 13.
- the inner wall surface 13a of the frame body 13 is shown as an upright surface, but is not limited to such an upright surface.
- 13a can be a trumpet-shaped curvature surface or a slope with a large diameter at the top It can also be a surface. It is preferable that the inner wall surface 13 has such a curved surface or an inclined surface in order to guide light from the light emitting element to the outside.
- the light emitting element wiring board 11 of the present invention produced as described above is used as a light emitting device by mounting the light emitting element in the mounting area 9 thereof.
- FIGS. 8 (a) and 8 (b) which show the cross-sectional structure of such a light emitting device
- the light emitting device indicated by 25 as a whole is mounted on the mounting area 9 of the wiring board 11 such as an LED chip. It has a structure in which the light emitting element 21 is mounted.
- the light emitting device 25 shown in FIG. 8 (a) is obtained by mounting the light emitting element 21 on the wiring board 11 of FIG. 1 (a), and is shown in FIG. 8 (b).
- the light-emitting device 25 has a structure in which the light-emitting element 21 is mounted on the wiring board 11 in FIG. 1B.
- the light emitting element 21 is bonded and fixed to the mounting area 9 of the wiring board 11 with an appropriate adhesive material 29, and the connection terminals 3 3 , 3 of the wiring board 11 are bonded by bonding wires 23. Connected to b. That is, by supplying power to the light emitting element 21 from the connection terminals 3 a and 3 b via the bonding wire 23, the light emitting element 21 can function. Further, the light emitting element 21 can be connected and fixed to the mounting area 9 by a so-called flip-chip connection without using the adhesive material 29. In this case, for example, the connection is performed without using the bonding wire 23. Power can be supplied to the light emitting element 21 directly from the terminals 3a and 3b.
- the light emitting element 21 mounted on the wiring board 11 is sealed by a molding material 31 made of a transparent resin material or the like.
- the light emitting element 21 can be sealed using a lid made of a material (for example, glass). Further, a phosphor for converting the wavelength of light emitted from the light emitting element 21 may be added to the molding material 31.
- light emitted from the light emitting device 25 can be reflected on the surface of the insulating substrate 1 or the inner surface of the frame 13 and guided in a predetermined direction, so that luminous efficiency can be increased.
- such a light emitting device 25 is generally mounted on an external circuit board (not shown) such as a printed board via the external connection terminal 5, but the thermal expansion coefficient of the insulating board 1 is close to that of the printed board. By doing so, a mismatch in the thermal expansion coefficient between the printed substrate and the molding material 31 can be suppressed, so that a light emitting device 25 with high bonding reliability can be obtained.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US11/568,258 US20080043444A1 (en) | 2004-04-27 | 2005-03-30 | Wiring Board for Light-Emitting Element |
US13/071,431 US8314346B2 (en) | 2004-04-27 | 2011-03-24 | Wiring board for light-emitting element |
Applications Claiming Priority (14)
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JP2004130901A JP4776175B2 (ja) | 2004-04-27 | 2004-04-27 | 発光素子収納用パッケージおよびその製造方法および発光装置および照明装置 |
JP2004-130901 | 2004-04-27 | ||
JP2004-219779 | 2004-07-28 | ||
JP2004219779A JP4780939B2 (ja) | 2004-07-28 | 2004-07-28 | 発光装置 |
JP2004-242224 | 2004-08-23 | ||
JP2004242224A JP2006066409A (ja) | 2004-07-28 | 2004-08-23 | 発光素子用配線基板および発光装置ならびに発光素子用配線基板の製造方法 |
JP2004247203A JP2006066630A (ja) | 2004-08-26 | 2004-08-26 | 配線基板および電気装置並びに発光装置 |
JP2004-247203 | 2004-08-26 | ||
JP2004-279513 | 2004-09-27 | ||
JP2004279513A JP2006093565A (ja) | 2004-09-27 | 2004-09-27 | 発光素子用配線基板ならびに発光装置およびその製造方法 |
JP2004-338867 | 2004-11-24 | ||
JP2004338867A JP2006147999A (ja) | 2004-11-24 | 2004-11-24 | 発光素子用配線基板並びに発光装置 |
JP2004340339A JP2006156447A (ja) | 2004-11-25 | 2004-11-25 | 発光素子用配線基板ならびに発光装置およびその製造方法 |
JP2004-340339 | 2004-11-25 |
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US11/568,258 A-371-Of-International US20080043444A1 (en) | 2004-04-27 | 2005-03-30 | Wiring Board for Light-Emitting Element |
US13/071,431 Division US8314346B2 (en) | 2004-04-27 | 2011-03-24 | Wiring board for light-emitting element |
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WO2005106973A1 true WO2005106973A1 (ja) | 2005-11-10 |
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TW200541415A (en) | 2005-12-16 |
US8314346B2 (en) | 2012-11-20 |
US20080043444A1 (en) | 2008-02-21 |
US20110169037A1 (en) | 2011-07-14 |
TWI365011B (ja) | 2012-05-21 |
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