JP2011014639A - Base material for metal core substrate and method for manufacturing metal core substrate using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base material for a metal core substrate which is inexpensive and excellent in heat dissipation, and a method for manufacturing the metal core substrate using the base material for the metal core substrate.SOLUTION: The base material 1 for the metal core sandwiched between a pair of prepregs 6 constituting the metal core substrate 5 includes a planar metal core 2, terminals 3 formed of metal having strength higher than that of the planar metal core 2 and a positioning member 4. The positioning member 4 is connected to the metal core 2, and positions the terminals 3 in a notch 10 of the metal core 2 where one-side ends 3a are sandwiched together with the metal core 2 by the pair of prepregs 6 and other ends 3b are protruded from outer edges of the prepregs 6 to the outside. The base material 1 for the metal core substrate is sandwiched between the pair of prepregs 6 in a state that the other ends 3b of the terminals 3 protrude from the outer edges of the pair of prepregs 6 to the outside, the base material 1 for the metal core substrate and the pair of prepregs 6 are pressurized and heated for integration, and then the positioning member 4 is cut to manufacture the metal core substrate 5.

Description

  The present invention relates to a base material for a metal core substrate that is used for manufacturing a metal core substrate and is laminated with a pair of insulators constituting the metal core substrate, and a method for manufacturing the metal core substrate using the base material for metal core substrate.

  With recent high performance and miniaturization of electronic devices, the amount of heat generated increases due to the increase in capacity of electrical components mounted on printed wiring boards and the increase in the density of electrical components and conductor patterns. It was necessary to improve the heat dissipation in order to suppress the rise to the standard value. Therefore, a metal core wiring board (see, for example, Patent Document 1) provided with a metal core substrate excellent in heat dissipation and heat uniformity has been proposed.

  The metal core wiring board disclosed in Patent Document 1 has a metal core substrate formed by sandwiching a conductive metal core between a pair of insulators, and a predetermined circuit provided on the surface of the metal core substrate. A conductor pattern and a plurality of electrical components connected to the conductor pattern and mounted on the surface of the metal core substrate are provided.

  The metal core substrate includes a metal core having good thermal conductivity, such as aluminum and copper, and a pair of insulators stacked on the metal core with the metal core interposed therebetween. In the metal core wiring board described above, since the metal core substrate has a metal core having a high thermal conductivity, it is possible to prevent a local temperature rise.

JP 2007-294932 A

  However, the metal core wiring board disclosed in the above-mentioned Patent Document 1 has a metal terminal board with a terminal block of a connector block that fits with a connector of a wire harness to which the electronic device is connected in order to connect to the outside (electronic device). It was necessary to assemble. For this reason, it is difficult for heat to be transmitted to the connection portion between the terminal metal fitting and the conductor pattern provided on the surface of the metal core substrate, that is, the heat of the metal core of the metal core substrate is difficult to be transmitted to the terminal metal fitting described above. Therefore, it is difficult to dissipate heat generated in the metal core wiring board to the outside.

  In order to solve the above-described problem, it is conceivable that the metal core wiring board has a structure in which the terminal portion is integrally provided on the metal core of the metal core substrate. By doing so, the metal core wiring board does not need to assemble the terminal block of the connector block to be fitted with the connector of the wire harness to which the electronic device is connected to the metal core substrate, thereby reducing the number of parts and the number of man-hours required for assembly. it can.

  However, since the metal core wiring board in which the terminal portion is integrally provided on the metal core of the metal core substrate described above requires strength (hardness) considering insertion / extraction to the connector of the terminal portion, the metal core of the metal core substrate is thermally conducted. There is a problem in that the material has to be made of a material having a high rate and high strength (hardness), and an expensive material is required, resulting in an increase in cost.

  Accordingly, an object of the present invention is to provide a metal core substrate base material that is inexpensive and excellent in heat dissipation, and a method for manufacturing a metal core substrate using the metal core substrate base material in view of the above-described problems. .

  In order to solve the above problems and achieve the object, the invention described in claim 1 is a base material for a metal core substrate sandwiched between a pair of insulators constituting a metal core substrate, and is a flat metal core A terminal portion made of a metal stronger than the metal core, one end portion of the terminal portion is sandwiched between the pair of insulators together with the metal core, and the other end portion of the terminal portion is the pair of the pair. A positioning member connected to the metal core by positioning the terminal portion at a predetermined position relative to the metal core protruding outward from an outer edge portion of an insulator; is there.

  The invention described in claim 2 is characterized in that, in the invention described in claim 1, the thickness of the terminal portion is larger than the thickness of the metal core.

  Invention of Claim 3 is a manufacturing method of the metal core board | substrate which manufactures a metal core board | substrate using the base material for metal core board | substrates of Claim 1, Comprising: The other end side of the said terminal part is a pair of insulation. With the metal core substrate base material sandwiched between the pair of insulators in a state of protruding outward from the outer edge of the body, the pair of insulators and the metal core substrate base material are stacked, The metal core substrate manufacturing method according to claim 1, wherein the positioning member is cut after the laminated base material for the metal core substrate and the pair of insulators are heated and integrated.

  According to the first aspect of the present invention, a flat metal core, a terminal portion made of a metal having a higher strength than the metal core, and a pair of insulators together with the metal core near one end of the terminal portion And a positioning member connected to the metal core by positioning the terminal at a predetermined position with respect to the metal core that is sandwiched between the terminals and protrudes from the outer edge of the pair of insulators to the outside. When the metal core and the pair of insulators are stacked by the positioning member, the other end of the terminal portion can be protruded from the outer edge portion of the pair of insulators to the outside, so that the number of work steps can be reduced. . In addition, since the metal core and the terminal portion can each be made of an optimal material, the metal core can be made of a material having high thermal conductivity, and the terminal portion can be made of a material having high hardness, resulting in a material cost. Can be suppressed.

  According to the invention described in claim 2, since the thickness of the terminal portion is formed to be thicker than the thickness of the metal core, the strength of the terminal portion can be increased with a simple structure, and the metal core The thickness can be set in consideration of only the temperature rise, the weight can be reduced, and the material cost can be suppressed.

  According to the third aspect of the present invention, the metal core substrate base material is sandwiched between the pair of insulators in a state where the other end of the terminal portion is protruded to the outside from the outer edge portions of the pair of insulators. Then, after laminating the pair of insulators and the metal core substrate base material, and pressing and heating the metal core substrate base material and the pair of insulators laminated together, the positioning member is cut off. Since a metal core substrate can be manufactured, a laminate molding apparatus used when manufacturing a conventional metal core substrate can be used. For this reason, the cost concerning an installation can be reduced.

  As described above, according to the first aspect of the present invention, when the metal core and the pair of insulators are stacked by the positioning member, the other end of the terminal portion is externally provided from the outer edge portion of the pair of insulators. Since the shift can be protruded, the number of work steps can be reduced. In addition, since the metal core and the terminal portion can each be made of an optimal material, the metal core can be made of a material having high thermal conductivity, and the terminal portion can be made of a material having high hardness, resulting in a material cost. Can be suppressed. Therefore, it is possible to provide a metal core substrate base material that is inexpensive and excellent in heat dissipation.

  According to the second aspect of the present invention, the strength of the terminal portion can be increased with a simple structure, and the thickness of the metal core can be reduced considering only the temperature rise, and the weight can be reduced. At the same time, the material cost can be reduced.

  According to the third aspect of the present invention, since it is possible to use a lamination molding apparatus or the like used when manufacturing a conventional metal core substrate, it is possible to reduce the cost of equipment. For this reason, the cost for manufacturing a metal core board | substrate can be suppressed.

It is a top view which shows the metal core aggregate | assembly 8 of the base material for metal core boards concerning one Embodiment of this invention. It is a top view which shows the base material for metal core substrates concerning one Embodiment of this invention. It is explanatory drawing which shows the principal part of the base material for metal core board | substrates shown by FIG. It is sectional drawing which shows an example of the lamination molding apparatus used for manufacture of the metal core board | substrate of this invention. It is sectional drawing which shows the state which the lamination molding apparatus shown by FIG. 4 pressurized and heated the base material for metal core boards, and the insulator. FIG. 5 is a plan view showing a state in which an insulator is laminated and integrated on the metal core substrate base material of FIG. 2 by the lamination molding apparatus shown in FIG. 4. It is a top view which shows the state by which the positioning member of the base material for metal core board | substrates laminated | stacked and integrated with the insulator shown by FIG. 6 was cut off.

  A metal core substrate base material according to an embodiment of the present invention and a metal core substrate manufacturing method using the metal core substrate base material will be described with reference to FIGS. 2 or 3 is used for manufacturing the metal core substrate 5, and a pair of prepregs 6 as insulators constituting the metal core substrate 5 are laminated. The metal core substrate 5 is an electric circuit substrate that radiates heat generated by electronic components mounted on the surface of the metal core substrate 5 and equalizes the heat.

  The metal core substrate substrate 1 shown in FIG. 2 or 3 includes a flat metal core 2, a terminal portion 3 formed separately from the metal core 2, and the terminal portion 3 of the metal core 2 described later. And a positioning member 4 positioned in the notch 10 (predetermined position). As shown in FIG. 1, at least one metal core 2 for metal core substrate 1 is manufactured in batch from metal core assembly 8 (four in the illustrated example).

  In the present embodiment, an example in which four metal cores 2 are collectively manufactured from the metal core assembly 8 shown in FIG. 1 will be described. However, the present invention is not limited to this example, and for example, five or more sheets. The metal cores 2 can be manufactured in a lump, and various other embodiments can be obtained.

  The metal core assembly 8 is configured by a substantially rectangular metal plate made of a material having good thermal conductivity, such as copper or aluminum. And the metal core aggregate | assembly 8 is isolate | separated into the some metal core 2 by cut | disconnecting along the dotted line S shown in FIG. Each of the plurality of metal cores 2 is a member constituting the metal core substrate 5.

  The metal core 2 is formed in a rectangular shape, and is provided with notches 10 on both sides in the width direction (left and right direction in FIG. 2). Each notch 10 is formed by cutting away from the outer edge of the metal core 2 toward the center. Each notch 10 is provided with a pair of engaging recesses 11 with which an engaging portion 13 of a positioning member 4 described later is engaged. As shown in FIG. 2 or FIG. 3, the pair of engaging recesses 11 are formed by notching the edge of each notch 10 and are arranged along the longitudinal direction (vertical direction in FIG. 2) of each notch 10. Spacing and facing each other.

  And as shown in FIG. 2, the metal core 2 of the structure mentioned above has the terminal part 3 arrange | positioned inside the notch part 10, and as shown in FIG. 4 or FIG. Laminated. That is, the metal core 2 is sandwiched between the pair of prepregs 6 together with the terminal portion 3.

  The terminal portion 3 is made of a metal having higher strength (higher level) than the material constituting the metal core 2. A plurality of terminal portions 3 are formed in a strip shape that is thicker than the thickness of the metal core 2. As shown in FIG. 2, a plurality (5 in the illustrated example) of the plurality of terminal portions 3 are arranged in each notch portion 10 (predetermined position) on both sides in the width direction of the metal core 2. The plurality of terminal portions 3 are arranged at intervals along the longitudinal direction of each cutout portion 10 and are connected by a plurality of connecting portions 12 described later of the positioning member 4.

  In addition, in this embodiment, although the thickness of the terminal part 3 mentioned above is formed in the strip shape thicker than the thickness of the metal core 2, this invention is not limited to this, The thickness of the terminal part 3 is metal. It may be formed equivalent to the thickness of the core 2.

  The positioning member 4 is formed integrally with the plurality of terminal portions 3 described above, and includes a plurality of connecting portions 12 and a pair of engaging portions 13. The plurality of connecting portions 12 are arranged between the plurality of terminal portions 3 to connect the plurality of terminal portions 3.

  The pair of engaging portions 13 protrude from the terminal portion 3 located at the upper side in FIG. 2 of the plurality of terminal portions 3 and the terminal portion 3 located at the lower side in FIG. The pair of engaging portions 13 protrude from the terminal portion 3 located at the upper side in FIG. 2 and the terminal portion 3 located at the lower side in FIG. Further, the pair of engaging portions 13 is provided with a concave portion 13a at the tip portion. The concave portions 13a are bent when the respective engaging portions 13 are press-fitted into the respective engaging concave portions 11 of the metal core 2 described above, thereby facilitating the press-fitting of the respective engaging portions 13 into the respective engaging concave portions 11.

  The plurality of connecting portions 12 and the pair of engaging portions 13 described above are arranged at the center in the longitudinal direction of the plurality of terminal portions 3, and the direction in which the plurality of terminal portions 3 are arranged, that is, the notch portion 10 described above. They are arranged on the same line along the longitudinal direction.

  The positioning member 4 having the above-described configuration is configured such that each of the pair of engaging portions 13 is press-fitted into each engaging recess 11 of the metal core 2 and engaged with each engaging recess 11. 2, the plurality of terminal portions 3 are positioned in the respective notches 10 (predetermined positions) of the metal core 2, and the plurality of terminal portions 3 are fixed to the metal core 2.

  Thus, the positioning member 4 described above positions the plurality of terminal portions 3 in the respective cutout portions 10 (predetermined positions) of the metal core 2, so that one end portion (close to one end) 3 a of each terminal portion 3 together with the metal core 2. Positioned with respect to the metal core 2 so that the other end (near the other end) 3b of each terminal portion 3 protrudes outside from the outer edge of the pair of prepregs 6 between the pair of prepregs 6.

  As described above, in the present embodiment, the metal core substrate base material 1 includes the flat metal core 2, the terminal portion 3 made of a metal having a higher strength than the metal core 2, and the terminal portion 3. One end portion 3a is sandwiched between the pair of prepregs 6 together with the metal core 2, and the other end portion 3b of the terminal portion 3 is in the notch portion 10 (predetermined position) of the metal core 2 protruding outside from the outer edge portions of the pair of prepregs 6. , And a positioning member 4 that positions the terminal portion 3 and is connected to the metal core 2.

  For this reason, when the metal core 2 and the pair of prepregs 6 are laminated by the positioning member 4, the other end 3 b of the terminal portion 3 can be protruded from the outer edge of the pair of prepregs 6. can do. Moreover, since the metal core 2 and the terminal part 3 can each be comprised with an optimal material, the metal core 2 can be comprised with a material with high heat conductivity, and the terminal part 3 can be comprised with a material with high hardness. And material costs can be reduced. Therefore, it can be set as the base material 1 for metal core substrates which is cheap and excellent in heat dissipation.

  Moreover, since the thickness of the terminal part 3 is formed thicker than the thickness of the metal core 2, the strength of the terminal part 3 can be increased with a simple structure, and the thickness of the metal core 2 considering only the temperature rise. Can be. Therefore, the weight can be reduced and the material cost can be suppressed.

  Next, an example of manufacturing the metal core substrate 5 using the above-described metal core substrate base material 1 will be described with reference to FIGS. First, the metal core substrate base 1 described above is disposed between a pair of prepregs 6 as insulators, and the metal core substrate base 1 and the pair of prepregs 6 are overlapped with each other. Each of the pair of prepregs 6 has a sheet shape in which carbon fiber, glass fiber, aramid fiber, or the like is impregnated with an uncured thermosetting resin (such as an epoxy resin).

  The pair of prepregs 6 described above sandwich the metal core 2 of the metal core substrate base material 1 and the longitudinal end portions 3a of the plurality of terminal portions 3 and the longitudinal direction of the plurality of terminal portions 3 in between. In a state where the other end 3b protrudes from the outer edge of the pair of prepregs 6, the metal core substrate base material 1 is sandwiched between each other and the metal core substrate base material 1 is overlapped. That is, the pair of prepregs 6 is laminated with the metal core substrate base material 1 in such a manner that the other end portions 3b of the plurality of terminal portions 3 protrude outward from the outer edge portions of the pair of prepregs 6.

  Next, the metal core substrate base material 1 and the pair of prepregs 6 laminated (overlaid) with each other are pressurized and heated by a known lamination molding apparatus 30 (shown in FIGS. 4 and 5) to be integrated. . 4 and 5 includes a movable platen 31, a fixed platen 32 provided to face the movable platen 31, and a driving means (not shown) that drives the movable platen 32 up and down. is doing.

  When the metal core substrate base material 1 and the pair of prepregs 6 stacked on each other are placed at predetermined positions on the stationary platen 32, the lamination molding apparatus 30 moves the movable platen 31 to the stationary platen 32 by driving means. The metal core substrate base material 1 and the pair of prepregs 6 stacked on each other are pressurized and heated between the movable platen 31 and the fixed platen 32. In this way, the metal core substrate base material 1 and the pair of prepregs 6 stacked on each other are integrated.

  Finally, the plurality of connecting portions 12 and the pair of engaging portions 13 of the positioning member 4 of the metal core substrate base material 1 integrated with the pair of prepregs 6 described above are cut out. At this time, the metal core 2 and the plurality of terminal portions 3 of the base 1 for metal core substrate are electrically cut, and the metal core 2 and the plurality of terminal portions 3 are integrated by a pair of prepregs 6. Thus, the metal core substrate 5 is formed.

  And the metal core board | substrate 5 of the structure mentioned above has a conductor pattern formed in the surface, and a some electric component is mounted, and the metal core 2 and the some terminal part 3 are electrically connected by a predetermined pattern. For example, it is used as a metal core wiring board that constitutes an electrical junction box or the like mounted on an automobile. And the some terminal part 3 of the metal core board | substrate 5 is each inserted in the connector of the wire harness (partner side) fitted with an electrical-connection box, and is connected with each terminal of this connector.

  According to the manufacturing method of the metal core substrate 5 using the base material 1 for metal core substrate described above, the pair of prepregs in a state where the other end portion 3b of the terminal portion 3 protrudes from the outer edge portions of the pair of prepregs 6 to the outside. The pair of prepregs 6 and the metal core substrate base material 1 are laminated with the metal core substrate base material 1 sandwiched between them, and the metal core substrate base material 1 and the pair of prepregs 6 stacked on each other are pressurized and heated. After the integration, the metal core substrate 5 can be manufactured by cutting the positioning member 4.

  For this reason, the lamination molding apparatus etc. which are used when manufacturing the conventional metal core board | substrate can be utilized, and the cost concerning an installation can be reduced. Therefore, the cost for manufacturing the metal core substrate 5 can be suppressed.

  In the above-described embodiment, the metal core substrate 1 is connected to the metal core 2 by press-fitting each engagement portion 13 of the positioning member 4 into each engagement recess 11 of the metal core 2. However, the present invention is not limited to this, and each engaging portion 13 of the positioning member 4 may be connected to the metal core 2 by welding or the like.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

1 Metal Core Substrate 2 Metal Core 3 Terminal 3a One end (close to one end)
3b The other end (near the other end)
4 Positioning member 5 Metal core substrate 6 Prepreg (insulator)
8 Metal Core Aggregate 10 Notch 11 Engaging Recess 12 Connecting Portion 13 Engaging Portion

Claims (3)

A base material for a metal core substrate sandwiched between a pair of insulators constituting a metal core substrate,
A flat metal core;
A terminal portion made of a metal having a stronger strength than the metal core;
At a predetermined position with respect to the metal core, one end portion of the terminal portion is sandwiched between the pair of insulators together with the metal core, and the other end portion of the terminal portion protrudes outside from an outer edge portion of the pair of insulators. A positioning member for positioning the terminal portion and connected to the metal core;
A base material for a metal core substrate, comprising:   The base material for a metal core substrate according to claim 1, wherein a thickness of the terminal portion is formed to be thicker than a thickness of the metal core. A metal core substrate manufacturing method for manufacturing a metal core substrate using the metal core substrate base material according to claim 1,
With the other end of the terminal portion protruding outward from the outer edge of the pair of insulators, the metal core substrate base material is sandwiched between the pair of insulators, and the pair of insulators The metal core substrate base material is laminated, and the positioning member is cut off after the metal core substrate base material and the pair of insulators laminated together are pressed and heated to be integrated. A method for manufacturing a substrate.

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