WO2009145109A1 - 金属ベース回路基板 - Google Patents
金属ベース回路基板 Download PDFInfo
- Publication number
- WO2009145109A1 WO2009145109A1 PCT/JP2009/059363 JP2009059363W WO2009145109A1 WO 2009145109 A1 WO2009145109 A1 WO 2009145109A1 JP 2009059363 W JP2009059363 W JP 2009059363W WO 2009145109 A1 WO2009145109 A1 WO 2009145109A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- circuit portion
- insulating layer
- linear expansion
- ppm
- expansion coefficient
- Prior art date
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- H05K2201/09781—Dummy conductors, i.e. not used for normal transport of current; Dummy electrodes of components
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- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
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- H05K2201/10007—Types of components
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- H—ELECTRICITY
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- H—ELECTRICITY
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49126—Assembling bases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49155—Manufacturing circuit on or in base
- Y10T29/49165—Manufacturing circuit on or in base by forming conductive walled aperture in base
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
- Y10T428/12556—Organic component
- Y10T428/12569—Synthetic resin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T428/24917—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including metal layer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T428/24926—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including ceramic, glass, porcelain or quartz layer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T428/252—Glass or ceramic [i.e., fired or glazed clay, cement, etc.] [porcelain, quartz, etc.]
Definitions
- the present invention relates to a metal base circuit board used in a field where heat dissipation and thinning are required, such as a liquid crystal display device using an LED (light-emitting diode) as a light source.
- a liquid crystal display device using an LED (light-emitting diode) as a light source.
- Examples of the light source of the liquid crystal backlight include a CCFL (Cold Cathode Fluorescent Lamp) and an LED.
- CCFL Cold Cathode Fluorescent Lamp
- LED has advantages such as ease of use and long life, LED has excellent color reproducibility, high brightness and thinness, and uses no mercury, so it has less environmental impact than CCFL and is strong against vibration and impact. It can be used in a wide temperature range ( ⁇ 40 ° C. to 85 ° C.), and further has an advantage of having a life of 50,000 hours depending on the use environment.
- the luminous efficiency of the LED is lower than that of the CCFL, the temperature in the vicinity of the LED tends to be higher than that of the CCFL in a sealed space such as the inside of the liquid crystal backlight. Since luminance decreases under such conditions, it is necessary to increase the current value, so heat generation increases and temperature further increases. For this reason, deterioration of a semiconductor element is accelerated
- the substrate for LED backlight has good heat dissipation characteristics without using sub-members or thermovias, and the amount of warpage is suppressed, so that the work for circuit formation of the printed wiring board and LED mounting is performed.
- the problem is to improve the performance.
- the linear expansion coefficient is provided on one surface of the insulating layer having a linear expansion coefficient of 60 ppm / ° C. to 120 ppm / ° C., and the linear expansion coefficient is 10 ppm / ° C. to 35 ppm / ° C.
- the insulating layer, the circuit portion and the non-circuit portion The total area of the non-circuit portion and the circuit portion on the insulating layer is 50% or more and 95% or less with respect to the area of the metal foil, and the relationship between the linear expansion coefficients of the respective materials
- a metal base circuit board in which the linear expansion coefficient of the insulating layer> the linear expansion coefficient of the metal foil> the linear expansion coefficient of the circuit portion and the non-circuit portion.
- the insulating layer is formed of an epoxy resin, a curing agent, and an inorganic filler, and the inorganic filler is contained in an amount of 40% by volume to 70% by volume with respect to the total volume of the insulating layer.
- a base circuit board is provided.
- a metal base circuit board in which the curing agent includes a substance having one or both of a hydroxyl group and an amino group.
- a metal base circuit board in which the white film contains titanium dioxide as a white pigment, the titanium dioxide is a rutile type, and the surface is coated with aluminum hydroxide or silicon dioxide. .
- the substrate for LED backlight in the substrate for LED backlight, it has a good heat dissipation characteristic without using a sub member or a thermovia, so that it is possible to extend the life of the LED and to suppress the amount of warping. Workability at the time of circuit formation of the wiring board and LED mounting can be improved.
- An explanatory view showing typically an example of a metal base circuit board concerning the present invention.
- FIG. 1 schematically shows a hybrid integrated circuit module using a metal base circuit board according to an embodiment of the present invention, and shows a cross-sectional view of the metal base circuit board.
- the metal base circuit board includes a metal foil 1, an insulating layer 2, and a circuit portion 3 formed on the surface of the insulating layer 2 on which the metal foil 1 is not provided.
- a non-circuit portion 4 formed on the surface of the insulating layer 2 where the metal foil 1 is not provided, and a white film 5 formed on the insulating layer 2, the circuit portion 3 and the non-circuit portion 4. Yes.
- the LED package 7 is mounted on the circuit portion 3 via the solder joint portion 6 to obtain a hybrid integrated circuit module.
- the metal base circuit board according to this embodiment is provided on one surface of an insulating layer having a linear expansion coefficient of 60 ppm / ° C. or higher and 120 ppm / ° C. or lower, and has a linear expansion coefficient of 10 ppm / ° C. or higher and 35 ppm / ° C.
- the sum total of the area of a non-circuit part and a circuit part on an insulating layer is 50% or more and 95% or less with respect to the area of metal foil.
- the relationship between the linear expansion coefficients of the respective materials is that the linear expansion coefficient of the insulating layer> the linear expansion coefficient of the metal foil> the linear expansion coefficient of the circuit portion and the non-circuit portion.
- the circuit portion and the non-circuit portion are made of the same conductive material (conductor metal) provided on the insulating layer, and the circuit portion means a circuit portion through which a current flows in order to drive an electronic / electrical element.
- the non-circuit portion means a conductive material (conductive metal) that is not electrically used.
- the total area of the non-circuit portion 4 and the circuit portion 3 on the insulating layer 2 is 50% or more and 95% or less. If the total area is 50% or more, warpage of the metal base circuit board can be suppressed, and mounting of electronic components such as LEDs is easy. In addition, when the total sum of the areas is 95% or less, a sufficient space between the circuit portion and the non-circuit portion can be secured, so that electrical reliability can be secured.
- the linear expansion coefficients of the circuit portion 3 and the non-circuit portion 4 are 10 ppm / ° C. or more and 35 ppm / ° C. or less.
- the conductor material that can be employed as the circuit portion 3 and the non-circuit portion 4 can be appropriately selected as long as it is a conductor material having the above-described linear expansion coefficient. Specifically, Ni, Cu, Al, Fe, Si, and stainless steel simple steel Or their alloys. Among these, considering heat dissipation, Cu, Al, or an alloy of Cu and Al is particularly preferable.
- the thickness of the circuit portion 3 and the non-circuit portion 4 is preferably 18 ⁇ m or more and 70 ⁇ m or less.
- the thickness of the circuit portion 3 and the non-circuit portion 4 is 18 ⁇ m or less, problems such as wrinkles are likely to occur during handling when manufacturing the metal base substrate.
- the thickness of the circuit portion 3 and the non-circuit portion 4 is 70 ⁇ m, a problem occurs when the pattern of the circuit portion and the non-circuit portion is produced.
- the linear expansion coefficient of the metal material constituting the metal foil 1 is 10 ppm / ° C. or more and 35 ppm / ° C. or less.
- any metal having the above-described linear expansion coefficient can be selected as appropriate, and specifically, there are Ni, Cu, Al, Si, Fe, stainless steel alone or an alloy thereof. Among these, considering heat dissipation, Cu, Al, or an alloy of Cu and Al is particularly preferable.
- the thickness of the metal foil 1 is preferably 150 ⁇ m or more and 300 ⁇ m or less.
- the thickness of the metal foil 1 is 150 ⁇ m or more, problems such as breakage can be suppressed by handling during the production of the metal base substrate, and from the viewpoint of thinning the liquid crystal display device, 300 ⁇ m or less is preferable.
- the linear expansion coefficient of the insulating layer 2 is not less than 60 ppm / ° C. and not more than 120 ppm / ° C.
- any insulating material having the above-described linear expansion coefficient can be selected as appropriate, and specific examples include epoxy resins, silicone resins, and copolymers thereof. Among these, an epoxy resin is particularly preferable because of its heat resistance and adhesion to metal.
- these resins may appropriately contain a curing agent, an inorganic filler, and an additive that promotes improvement of wettability and leveling properties to the base and lowering of viscosity to reduce generation of defects during formation.
- an additive include an antifoaming agent, a surface conditioner, and a wetting and dispersing agent.
- the thickness of the insulating layer 2 is preferably 80 ⁇ m or more and 180 ⁇ m or less.
- the thickness of the insulating layer 2 is 80 ⁇ m or more, it is easy to ensure insulation, and when it is 180 ⁇ m or less, it is easy to form the insulating layer uniformly.
- epoxy resin used for the insulating layer 2 a known epoxy resin can be employed.
- a known epoxy resin can be employed.
- the chloride ion concentration in the epoxy resin is preferably 1000 ppm or less, and more preferably 500 ppm or less. This is because when the chloride ion concentration in the epoxy resin composition increases, the migration of ionic impurities occurs at high temperatures, high humidity, and direct current to alternating current voltage, and the electrical insulation tends to decrease.
- the curing agent for the epoxy resin one containing a substance having one or both of a hydroxyl group and an amino group that reacts with the epoxy group is desirable.
- a substance having one or both of a hydroxyl group and an amino group that reacts with the epoxy group is desirable.
- a curing accelerator When using an epoxy resin curing agent, particularly a substance containing a hydroxyl group, a curing accelerator may be used.
- an imidazole type is preferable.
- the addition amount of the curing accelerator is desirably 0.005 part or more and 5 parts or less. If the addition amount of the curing accelerator is 5 parts or less, the pot life becomes long and deterioration of workability due to thickening can be suppressed, and if it is 0.005 parts or more, high-temperature heating at the time of curing becomes a short time, cost and work From the viewpoint of sex.
- the inorganic filler contained in the insulating layer 2 is preferably an electrically insulating and heat conductive material, such as silica, alumina, aluminum nitride, silicon nitride, boron nitride, boron nitride, and magnesium oxide.
- an electrically insulating and heat conductive material such as silica, alumina, aluminum nitride, silicon nitride, boron nitride, boron nitride, and magnesium oxide.
- silica, alumina, and aluminum nitride are particularly preferable from the viewpoints of electrical insulation and thermal conductivity.
- the sodium ion concentration in the inorganic filler is preferably 500 ppm or less, and more preferably 100 ppm or less. If the sodium ion concentration in the inorganic filler is 500 ppm or less, the migration of ionic impurities hardly occurs at high temperatures, high humidity, and direct current or alternating current voltage, and the electrical insulation can be prevented from lowering.
- an inorganic filler is 40 volume% or more and 70 volume% or less with respect to the total volume of an insulating layer. If the content of the inorganic filler is 40% by volume or more, sufficient thermal conductivity can be obtained, and if it is 70% by volume or less, defects are less likely to occur when the insulating layer 2 is formed, and the withstand voltage and adhesion are improved. There is no loss.
- the heat conductivity after curing of the insulating layer 2 is preferably 1 W / m ⁇ K or more, and more preferably 2 W / m ⁇ K or more. If the thermal conductivity after curing is 1 W / m ⁇ K or more, the heat generated from the electronic component is efficiently radiated to the back side of the metal base circuit board, and further the heat is radiated to the outside, thereby storing the heat of the electronic component. Thus, it is possible to provide a hybrid integrated circuit module having a long lifetime while reducing the temperature rise of electronic components.
- the breakdown voltage of the insulating layer 2 is preferably 1.8 kV or more, more preferably 2 kV or more in order to ensure insulation when a voltage is applied to the circuit portion after mounting an electronic component such as an LED.
- the relationship between the linear expansion coefficient of the metal material constituting the metal foil, the linear expansion coefficient of the insulating layer, the linear expansion coefficient of the circuit part and the non-circuit part is as follows: It is preferable that the linear expansion coefficient of the insulating layer> the linear expansion coefficient of the metal foil> the linear expansion coefficient of the circuit portion and the non-circuit portion.
- the coefficient of linear expansion of the metal material constituting the metal foil is larger than the coefficient of linear expansion of the circuit part and the non-circuit part. This is to suppress warping when the non-circuit portion is formed and to maintain good workability during circuit formation and LED mounting.
- the non-circuit part 4 and the circuit part 3 mounting side surface of the insulating layer 2 are smooth and have good light reflectivity.
- the surface of the insulating layer 2 between the non-circuit portion 4 and the circuit portion 3 is preferably subjected to surface roughening treatment, plating, silane coupling treatment, etc. in order to increase the adhesion.
- the 90 ° C. peel strength between the insulating layer 2 and the “circuit portion 3 and non-circuit portion 4” is preferably 1 kg / cm or more, and more preferably, to ensure connection reliability after mounting electronic components such as LEDs. Is 1.4 kg / cm or more.
- the resin used as the white film 5 preferably contains one or more thermosetting resins and photocurable resins.
- An epoxy resin is suitable as the thermosetting resin, and an acrylic resin is suitable as the photocurable resin.
- the resin used as the white film 5 preferably contains one or more types of white pigments such as titanium dioxide, barium sulfate, talc, and silica as white pigments.
- white pigments such as titanium dioxide, barium sulfate, talc, and silica.
- a material containing titanium dioxide is preferable because of its high refractive index and high light reflectance of the substrate.
- Titanium dioxide is preferable because the rutile type is excellent in stability and has a weak photocatalytic action, and the deterioration of the resin component is suppressed compared to those of other structures.
- the surface is preferably coated with aluminum hydroxide or silicon dioxide.
- the content of the white pigment is preferably 30% by mass or more and 75% by mass or less in the composition of the white film 5. If the content of the white pigment is 30% by mass or more, a sufficient reflectance can be obtained, and if it is 75% by mass or less, a smooth coating film can be obtained without lowering the leveling property due to thickening. Reduction in reflectance can be suppressed.
- the white film 5 has a reflectance of 70% or more in the visible light region of 400 to 800 nm from the viewpoint of effective use of LED irradiation light, and in a more preferred embodiment, 460 nm (blue), 525 nm (red), and 620 nm. It is preferable to have a reflectance of 70% or more with respect to (red).
- the thermal conductivity of the white film 5 is preferably smaller than the thermal conductivity of the insulating layer 2. If the thermal conductivity of the white film 5 is smaller than the thermal conductivity of the insulating layer 2, the heat generated in the LED package will not be radiated from the white film through the circuit portion, so the ambient temperature in the vicinity of the LED is unlikely to rise. The lifetime of
- the metal base circuit board preferably has a total thickness of 265 ⁇ m or more and 500 ⁇ m or less in order to maintain the mechanical strength.
- the metal base circuit board preferably has a warpage amount of 3 mm or less per 100 mm of the metal base circuit board length.
- the warpage amount used in the present invention means “+: plus” when the non-circuit portion 4 and the circuit portion 3 on the insulating layer 2 are placed on a smooth and parallel surface with the non-circuit portion 4 and the circuit portion 3 facing upward. ", And the case where it is convex downward is defined as”-: minus ".
- the absolute value of the warp is the maximum height from the smooth and parallel surface of the outer periphery of the metal base circuit board.
- the outer shape of the metal base circuit board of the present invention is preferably vertically and horizontally symmetrical, and more preferably square or rectangular. Further, when it is difficult to make the outer shape symmetrical in the vertical and horizontal directions due to design restrictions, it is desirable to perform processing such as cutting on the outer periphery of the circuit board.
- the metal base circuit board of the present invention has good heat dissipation characteristics without using sub-members and thermovias, so that it is possible to extend the life of the LED and suppress the amount of warpage, thereby forming a circuit for a printed wiring board. It is possible to improve the workability at the time of mounting and LED, and it is extremely useful industrially as a metal base circuit board for LED backlight.
- the metal base circuit board according to the present embodiment is provided with a metal foil 1, an insulating layer 2 formed on one surface of the metal foil 1, and a metal foil of the insulating layer 2.
- This is a metal base circuit board having a circuit portion 3 and a non-circuit portion 4 formed on the non-surface and a white film 5 formed on the insulating layer 3, the circuit portion 3 and the non-circuit portion 4.
- symbol 7 of a figure is an LED package.
- the metal base circuit board of Example 1 was produced as follows.
- the insulating layer 2 was formed on a 35 ⁇ m thick copper foil so that the thickness after curing was 150 ⁇ m.
- the insulating layer 2 is made of bisphenol A type epoxy resin (manufactured by Dainippon Ink and Chemicals, “EPICLON-828”), and diaminodiphenylmethane (manufactured by Nippon Synthetic Chemical Industry, “H84B”) as an amine curing agent as a curing agent.
- crushed coarse particles of silicon oxide having an average particle size of 1.2 ⁇ m manufactured by Tatsumori Co., Ltd., “A-1”
- crushed coarse particles of silicon oxide having an average particle size of 10 ⁇ m produced by Hayashi Kasei Co., Ltd.
- SQ-10 crushed coarse particles of silicon oxide having an average particle size of 10 ⁇ m
- an aluminum foil having a thickness of 200 ⁇ m was bonded and heated to thermally cure the insulating layer 2 to obtain a metal base substrate having a sodium ion concentration of 50 ppm or less in the entire inorganic filler in the insulating layer 2.
- a predetermined position is masked with an etching resist, and after etching the copper foil so that the circuit portion and the non-circuit portion have various total areas, the etching resist is removed and the copper base plate is made.
- a circuit portion 3 and a non-circuit portion 4 were formed to form a metal base circuit board.
- a white solder resist was applied as a high-reflectance white film 5 on the metal base circuit board, and cured with heat and ultraviolet rays. At this time, no white coating film is formed on the LED package mounting portion on the circuit portion 3.
- the white solder resist “SSR-6300S” manufactured by Yamaei Chemical Co., Ltd. was used.
- Example 1 as shown in Table 1, the total area of the non-circuit portion 4 and the circuit portion 3 on the insulating layer 2 is 79% of the area of the metal foil 1, and the metal material constituting the metal foil 1
- the coefficient of linear expansion was 23.9 ppm / ° C.
- the coefficient of linear expansion of the insulating layer 2 was 91.3 ppm / ° C.
- the coefficient of linear expansion of the circuit portion 3 and the non-circuit portion 4 was 17.5 ppm / ° C.
- the content of the inorganic filler with respect to the total volume of the insulating layer 2 was 35%, the resin used for the insulating layer was an epoxy resin, and an amine-based curing agent was added to the insulating layer. As shown in Table 1, in Example 1, the amount of warpage was 1.7 mm, which was a good value of 3 mm or less.
- Example 2 was created in the same manner as Example 1 except that the content of the inorganic filler with respect to the total volume of the insulating layer 2 was 56%.
- the warping amount was 1.1 mm, which was good at less than 3 mm.
- Example 3 as shown in Table 1, the curing agent used in the insulating layer 2 was phenol novolak (Maywa Kasei Co., Ltd., “HF-4M”), and the catalyst was an imidazole curing catalyst (Shikoku Kasei Co., Ltd., “ 2,3-dihydro-1H-pyrrolo [1,2-a] benzimidazole ”) was used in the same manner as in Example 1. In Example 3, the warp amount was 1.8 mm, which was good at less than 3 mm.
- Comparative Example 1 As shown in Table 1, Comparative Example 1 is the same as Example 1 except that the total area of the non-circuit portion 4 and the circuit portion 3 on the insulating layer 2 is set to 98% of the area of the metal foil 1. Created. In Comparative Example 1, it was impossible to make a circuit, rather than measuring the amount of warpage.
- Comparative Example 2 is the same as Example 1 except that the total area of the non-circuit portion 4 and the circuit portion 3 on the insulating layer 2 is 30% of the area of the metal foil 1. Created. In Comparative Example 2, the warp amount was 11.4 mm, and a large warp occurred.
- Comparative Example 3 As shown in Table 1, the linear expansion coefficient of the metal foil was 39.7 ppm / ° C., and the curing agent used in the insulating layer 2 was phenol novolac (manufactured by Meiwa Kasei Co., Ltd., “HF-4M”). It was created in the same manner as in Example 1 except that. In Comparative Example 3, the amount of warpage was 4.9 mm, exceeding 3 mm.
- Comparative Example 4 was prepared in the same manner as in Example 1 except that the linear expansion coefficient of the insulating layer 2 was 127.5 ppm / ° C. and the volume percentage of the inorganic filler was 0. In Comparative Example 4, the amount of warpage was 7.3 mm, exceeding 3 mm.
- Comparative Example 5 as shown in Table 1, the linear expansion coefficient of the circuit portion and the non-circuit portion was 4.3 ppm / ° C., and the curing agent used in the insulating layer 2 was an amine curing agent and a phenol novolak (manufactured by Meiwa Kasei Co., Ltd.). , “HF-4M”) and an imidazole-based curing catalyst (“2,3-dihydro-1H-pyrrolo [1,2-a] benzimidazole” manufactured by Shikoku Kasei Co., Ltd.) was used in the same manner as in Example 1. Created. In Comparative Example 5, the amount of warpage was 6.7 mm, exceeding 3 mm.
- Comparative Example 6 as shown in Table 1, the linear expansion coefficient of the metal foil is 10.5 ppm / ° C., and the linear expansion coefficient of the circuit portion and the non-circuit portion is 23.9 ppm / ° C.
- the amount of warpage was 9.2 mm, exceeding 3 mm.
- the metal base circuit board according to the present invention can suppress the amount of warpage of the board to half or less than that of the comparative example. Therefore, workability at the time of circuit formation of the printed wiring board and LED mounting can be improved.
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Insulated Metal Substrates For Printed Circuits (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Non-Metallic Protective Coatings For Printed Circuits (AREA)
Abstract
Description
CCFLは使いやすさ及び長寿命といった利点を持ち、LEDは、色再現性に優れ、高輝度、薄型であり、水銀を使用しないためにCCFLと比較して環境負荷が低く、振動や衝撃に強く、広範囲の温度領域(-40℃~85℃)で使用可能であり、さらに、使用環境によっては5万時間の寿命を有するという利点を持つ。
このため、LEDの温度上昇により半導体素子の劣化が促進され、LEDの寿命が短くなる。このため、LEDを実装するプリント配線板には放熱性が要求される。
2 絶縁層
3 回路部分
4 非回路部分
5 白色膜
6 半田接合部
7 LEDパッケージ
図1は、本発明の一実施形態に係る金属ベース回路基板を用いた混成集積回路モジュールを模式的に示したものであり、金属ベース回路基板の断面図を示している。
図1のように、半田接合部6を介してLEDパッケージ7を回路部分3上に搭載することにより、混成集積回路モジュールとなる。
そして、絶縁層上の非回路部分と回路部分の面積の総和が金属箔の面積に対して50%以上95%以下である。そして、且つ各素材の線膨張係数の関係が、絶縁層の線膨張係数>金属箔の線膨張係数>回路部分及び非回路部分の線膨張係数、であることを特徴とする。
本発明において、回路部分及び非回路部分は、絶縁層上に設けられた同じ導電材料(導体金属)からなり、回路部分とは、電子・電気素子を駆動させるために電流が流れる回路部分を意味する。また、本発明において非回路部分とは、電気的には利用しない導電材料(導体金属)を意味する。
上記面積の総和が50%以上であれば、金属ベース回路基板の反りを抑制でき、LEDを初めとする電子部品の実装が容易である。また、上記面積の総和が95%以下であれば、回路部分と非回路部分間のスペースを十分に確保できるため、電気的信頼性を確保できる。
回路部分3及び非回路部分4として採用できる導体材料としては、上記の線膨張係数を有する導体材料であれば適宜選択でき、具体的には、Ni、Cu、Al、Fe、Si、ステンレス単体鋼乃至それらの合金がある。
これらの中でも、放熱性を考慮すると、Cu、Al、又はCuとAlの合金が特に好ましい。
回路部分3及び非回路部分4の厚みが18μm以下であると、金属ベース基板製造時のハンドリングで皺等の問題が発生しやすくなる。また、回路部分3及び非回路部分4の厚みが70μmであると回路部分及び非回路部分のパターン作製時に問題が発生する。
本実施形態に係る金属ベース回路基板においては、金属箔1を構成する金属材料の線膨張係数は10ppm/℃以上35ppm/℃以下である。
金属箔として採用できる金属としては、上記の線膨張係数を有する金属であれば適宜選択でき、具体的には、Ni、Cu、Al、Si、Fe、ステンレス鋼単体乃至それらの合金がある。
これらの中でも、放熱性を考慮すると、Cu、Al、又はCuとAlの合金が特に好ましい。
金属箔1の厚みが150μm以上であると、金属ベース基板製造時のハンドリングで折れ等の問題を抑制することができ、液晶表示装置の薄型化の観点からは300μm以下が好ましい。
本実施形態に係る金属ベース回路基板においては、絶縁層2の線膨張係数は60ppm/℃以上120ppm/℃以下である。
絶縁層として採用できる素材としては、上記の線膨張係数を有する絶縁材であれば適宜選択でき、具体的には、エポキシ樹脂、シリコーン樹脂及びそれらの共重合体が挙げられる。
これらの中でも、耐熱性及び金属との接着性という理由からエポキシ樹脂が特に好ましい。
この添加剤としては、例えば、消泡剤、表面調整剤、湿潤分散剤等がある。
絶縁層2の厚みが80μm以上であると絶縁性を確保することが容易であり、180μm以下であると均一に絶縁層を形成することが容易になる。
これらの中でも、耐熱性及び金属との接着性という理由から、ビスフェノールAジグリシジルエーテル及びビスフェノールFジグリシジルエーテルが特に好ましい。
エポキシ樹脂組成物中の塩化物イオン濃度が高くなると、高温下、高湿下、直流乃至交流電圧下においてイオン性不純物の移動が起こり、電気絶縁性が低下する傾向があるためである。
硬化促進剤としてはイミダゾール系が好ましい。例えば、2-メチルイミダゾール、2-ウンデシルイミダゾール、2-ヘプタデシルイミダゾール、1,2-ジメチルイミダゾール、2-メチルー4―メチルイミダゾール、2-フェニルイミダゾール、2-フェニルー4-メチルイミダゾール、1-ベンジルー2-メチルイミダゾール、1-ベンジルー2-フェニルイミダゾール、2,3ージヒドロー1H―ピロロ〔1,2―a〕ベンズイミダゾール、2-フェニルー4,5―ジヒドロキシメチルイミダゾール、2,4―ジアミノー6-〔2’―メチルイミダゾリルー(1’)〕―エチルーs―トリアジン、2,4―ジアミノー6-〔2’―ウンデシルイミダゾリルー(1’)〕―エチルーs―トリアジン、1-シアノメチルー2―メチルイミダゾール等が望ましい。
これらの中でも、耐湿信頼性及びTg(ガラス転位温度)の向上という理由から、2,3ージヒドロー1H―ピロロ〔1,2―a〕ベンズイミダゾールが特に好ましい。
硬化促進剤の添加量が5部以下であればポットライフが長くなり増粘による作業性の低下を抑制でき、0.005部以上であれば硬化時の高温加熱が短時間となり、コスト及び作業性の観点から好ましい。
無機フィラー中のナトリウムイオン濃度が500ppm以下であれば、高温下、高湿下、直流乃至交流電圧下においてイオン性不純物の移動が起こり難く、電気絶縁性が低下を抑制できる。
無機フィラーの含有率が40体積%以上であれば十分な熱伝導率を得ることができ、70体積%以下であれば絶縁層2の形成時に欠陥が発生し難くなり、耐電圧、密着性を損なうことがない。
硬化後の熱伝導率が、1W/m・K以上であれば、電子部品から発生する熱を効率よく金属ベース回路基板裏面側に放熱し、さらに、外部に放熱することにより電子部品の蓄熱を低減し、電子部品の温度上昇を小さくするとともに、長寿命の混成集積回路モジュールを提供することができる。
絶縁層の線膨張係数>金属箔の線膨張係数>回路部分及び非回路部分の線膨張係数
であるのが好ましい。
白色膜5として使用される樹脂としては熱硬化性樹脂、光硬化性樹脂が1種類以上含有されることが好ましい。熱硬化性樹脂としてはエポキシ樹脂、光硬化性樹脂としてはアクリル樹脂が好適である。
特に二酸化チタンを含有したものが、屈折率が大きく、基板の光の反射率が高いために好ましい。
白色顔料の含有量が30質量%以上であれば十分な反射率を得ることができ、75質量%以下であれば増粘によりレベリング性が低下することなく、平滑な塗膜を得ることができ反射率の低下を抑制できる。
白色膜5の熱伝導率が絶縁層2の熱伝導率より小さければ、LEDパッケージの発熱が回路部分を介して白色膜から放熱することがないため、LED近傍の雰囲気温度が上昇し難く、LEDの寿命が長くなる。
実施例1の金属ベース回路基板は、次のように作成した。
35μm厚の銅箔上に、硬化後の厚さが150μmになるように絶縁層2を形成した。
絶縁層2は、ビスフェノールA型エポキシ樹脂(大日本インキ化学工業社製、「EPICLON-828」)に、硬化剤としてアミン系硬化剤としてのジアミノジフェニルメタン(日本合成化工社製、「H84B」)を加え、平均粒子径が1.2μmの破砕状粗粒子の酸化珪素(龍森社製、「A-1」)と平均粒子径が10μmである破砕状粗粒子の酸化珪素(林化成社製、「SQ-10」)を合わせて絶縁層中35体積%(球状粗粒子と球状微粒子は質量比が6:4)となるように配合した。
この時、回路部分3上のLEDパッケージ実装部分には白色塗膜を形成していない。白色ソルダーレジストとしては、山栄化学社製、「SSR-6300S」を用いた。
表1に示すように、実施例1では、反り量が1.7mmと、3mm以下の良好な値であった。
実施例2では、反り量が1.1mmと、3mm未満で良好であった。
実施例3では、反り量が1.8mmと、3mm未満で良好であった。
比較例1は、表1に示すように、絶縁層2上の非回路部分4と回路部分3の面積の総和を金属箔1の面積に対して98%とした以外は実施例1と同様に作成した。
比較例1では、反り量の測定どころか、回路化が不可能であった。
比較例2では、反り量が11.4mmと、大幅な反りが生じてしまった。
比較例3では、反り量が4.9mmと、3mmを超えて生じてしまった。
比較例4では、反り量が7.3mmと、3mmを超えて生じてしまった。
比較例5では、反り量が6.7mmと、3mmを超えて生じてしまった。
比較例6では、反り量が9.2mmと、3mmを超えて生じてしまった。
Claims (4)
- 線膨張係数が60ppm/℃以上120ppm/℃以下である絶縁層と、
絶縁層の一方の面に設けられ、線膨張係数が10ppm/℃以上35ppm/℃以下である金属材料からなる金属箔と、
絶縁層の他方の面に形成され、線膨張係数が10ppm/℃以上35ppm/℃以下である回路部分及び非回路部分と、
絶縁層、回路部分及び非回路部分上に形成した白色膜とを有し、
絶縁層上の回路部分と非回路部分の面積の総和が金属箔の面積に対して50%以上95%以下であり、且つ各素材の線膨張係数の関係が
絶縁層の線膨張係数>金属箔の線膨張係数>回路部分及び非回路部分の線膨張係数
である金属ベース回路基板。 - 絶縁層が、エポキシ樹脂、硬化剤及び無機フィラーで形成され、無機フィラーが絶縁層の総体積に対して40体積%以上70体積%以下含有されている請求項1に記載の金属ベース回路基板。
- 硬化剤が、水酸基及びアミノ基の一方又は双方を有する物質を含む請求項1に記載の金属ベース回路基板。
- 白色膜が白色顔料として二酸化チタンを含有し、二酸化チタンがルチル型で且つ表面が水酸化アルミニウム又は二酸化珪素で被覆されている請求項1に記載の金属ベース回路基板。
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CN2009801197175A CN102047772B (zh) | 2008-05-29 | 2009-05-21 | 金属基电路板 |
EP09754617A EP2293656B1 (en) | 2008-05-29 | 2009-05-21 | Metal base circuit board |
JP2010514453A JP5517927B2 (ja) | 2008-05-29 | 2009-05-21 | 金属ベース回路基板 |
US12/994,507 US8426740B2 (en) | 2008-05-29 | 2009-05-21 | Metal base circuit board |
KR1020107028982A KR101517649B1 (ko) | 2008-05-29 | 2009-05-21 | 금속 베이스 회로 기판 |
CA2726173A CA2726173C (en) | 2008-05-29 | 2009-05-21 | Metal base circuit board |
HK11109132.7A HK1155032A1 (en) | 2008-05-29 | 2011-08-30 | Metal base circuit board |
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Also Published As
Publication number | Publication date |
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US8426740B2 (en) | 2013-04-23 |
MY154125A (en) | 2015-05-15 |
HK1155032A1 (en) | 2012-05-04 |
CA2726173A1 (en) | 2009-12-03 |
CN102047772A (zh) | 2011-05-04 |
CN102047772B (zh) | 2012-12-26 |
EP2293656A1 (en) | 2011-03-09 |
TW201004501A (en) | 2010-01-16 |
KR20110019754A (ko) | 2011-02-28 |
JPWO2009145109A1 (ja) | 2011-10-13 |
KR101517649B1 (ko) | 2015-05-04 |
EP2293656A4 (en) | 2011-11-02 |
JP5517927B2 (ja) | 2014-06-11 |
EP2293656B1 (en) | 2012-12-12 |
US20110132644A1 (en) | 2011-06-09 |
TWI441574B (zh) | 2014-06-11 |
CA2726173C (en) | 2016-02-23 |
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