Source: http://www.google.com/patents/US8130499?dq=6,240,376
Timestamp: 2014-12-19 20:14:40
Document Index: 263452781

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Patent US8130499 - Heat dissipating structure base board, module using heat dissipating ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsThe present invention relates to a heat dissipation structure board and a module using this heat dissipation structure used for purpose required of high reliability such as a hybrid vehicle or an electric vehicle and to a method of manufacturing the heat dissipation structure. A resin structure is disposed...http://www.google.com/patents/US8130499?utm_source=gb-gplus-sharePatent US8130499 - Heat dissipating structure base board, module using heat dissipating structure base board, and method for manufacturing heat dissipating structure base boardAdvanced Patent SearchPublication numberUS8130499 B2Publication typeGrantApplication numberUS 12/530,277Publication dateMar 6, 2012Filing dateNov 28, 2008Priority dateNov 30, 2007Also published asCN101681907A, CN101681907B, EP2120263A1, EP2120263A4, US20100091464, WO2009069308A1Publication number12530277, 530277, US 8130499 B2, US 8130499B2, US-B2-8130499, US8130499 B2, US8130499B2InventorsTohru Ohnishi, Hitoshi Kouno, Toshiyuki Taniguchi, Koji Nakashima, Toshiyuki Nakata, Tsunetsugu Imanishi, Keiichi NakaoOriginal AssigneePanasonic CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (29), Non-Patent Citations (2), Referenced by (4), Classifications (28), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetHeat dissipating structure base board, module using heat dissipating structure base board, and method for manufacturing heat dissipating structure base boardUS 8130499 B2Abstract The present invention relates to a heat dissipation structure board and a module using this heat dissipation structure used for purpose required of high reliability such as a hybrid vehicle or an electric vehicle and to a method of manufacturing the heat dissipation structure. A resin structure is disposed on a lead frame constituting a heat dissipation board and an odd-shaped electronic component or the like mounted on this lead frame or the like to cover up the lead frame and the odd-shaped electronic component or the like, and this resin structure is fixed to a metal plate, a chassis of a device and the like to constitute the heat dissipation structure board as a whole, whereby fixing strengths of fixing the lead frame and the odd-shaped electronic component or the like, a bonding strength at an interface between the lead frame and the heat transfer layer and the like can be reinforced.
The invention claimed is: 1. A heat dissipation structure board comprising:
a heat transfer layer provided on the metal plate;
a lead frame having a terminal part, a portion of the lead frame other than the terminal part being fixedly attached to and arranged within the heat transfer layer;
a resin structure connected to an upper surface of the portion of the lead frame other than the terminal part;
a connection part in which the resin structure is fixed to at least one of the metal plate, the heat transfer layer, a chassis fixing the metal plate and a member to which the chassis is connected;
a guide part guiding a connection wiring and the terminal part, the connection wiring being a part of the terminal part, the connection wiring being formed by peeling up a part of the lead frame so as to protrude perpendicularly from the heat transfer layer; and
a reinforcement part that corresponds to a part of or more than the part of the lead frame, the resin structure abutting on the lead frame in the reinforcement part,
wherein the terminal part is formed at a peripheral edge of the heat transfer layer,
wherein the guide part is a wiring hole into which the connection wiring is inserted, the wiring hole having a tapered guide structure,
wherein a base of the connection wiring is fixed by the resin structure directly, the base of the connection wiring being a part of the lead frame arranged within the heat transfer layer,
and wherein the resin structure has a concave portion in a lower part of a periphery of the resin structure.
3. The heat dissipation structure board according to claim 1,
wherein at least one of the connection wiring and the resin structure is formed in a peripheral edge of the heat transfer layer or the heat dissipation structure board.
4. The heat dissipation structure board according to claim 2,
wherein the odd-shaped electronic component is insert molded into the resin structure.
6. The heat dissipation structure board according to claim 2,
wherein one or more than one connection part of the odd-shaped electronic component is protruded or exposed to a surface-side of the resin structure, the surface-side being out of contact with the metal plate.
7. The heat dissipation structure board according to claim 1,
wherein the wiring hole comprises one or more wiring holes formed in the resin structure, and
a part of the connection wiring of the heat dissipation structure board is connectable to an external circuit via the one or more wiring holes.
8. The heat dissipation structure board according to claim 2,
wherein the heat dissipation structure board includes a bus bar, the bus bar constituting a part of a wiring pattern of the heat dissipation structure board and holding the part of or more than the part of the odd-shaped electronic component.
9. The heat dissipation structure board according to claim 1,
wherein the resin structure includes a plurality of structures holding the connection wiring or a part of or more than the part of a printed circuit board connected to the connection wiring.
10. The heat dissipation structure board according to claim 1, further comprising:
a bare chip mounted on the lead frame, wherein the resin structure includes a sealing material protecting or sealing the bare chip.
11. The heat dissipation structure board according to claim 1,
wherein a metal foil pattern is provided on the heat transfer layer, and
a part of or more than the part of the lead frame includes a connection part electrically connected to the metal foil pattern, and the part of or more than the part of the lead frame is out of contact with the lead frame and a solder part formed on the metal foil pattern by the resin structure.
the heat dissipation structure board according to claim 1; and
one or more printed circuit boards almost in parallel to the metal plate, and provided on a surface-side of the resin structure different from a surface-side on which the metal plate is provided,
wherein the printed circuit board is electrically connected to a part of or more than the part of the connection wiring or the terminal part.
wherein an odd-shaped electronic component is provided between the metal plate and the resin structure, and the odd-shaped electronic component is electrically connected to at least one of the lead frame and the printed circuit board.
14. A method of manufacturing a heat dissipation structure board according to claim 1,
protruding a part of the lead frame from the heat transfer layer or bending the part of the lead frame almost perpendicularly to the heat transfer layer, thereby providing a connection wiring or a terminal part; and
fixing the resin structure to any one of or more than one of the metal plate and the heat transfer layer, a chassis of a device fixing the metal plate and a member to which the metal plate is connected.
15. The heat dissipation structure board according to claim 2,
16. The heat dissipation structure board according to claim 2,
17. The heat dissipation structure board according to claim 2, further comprising:
18. The heat dissipation structure board according to claim 3, further comprising:
19. The heat dissipation structure board according to claim 4, further comprising:
20. The heat dissipation structure board according to claim 5, further comprising:
21. The heat dissipation structure board according to claim 6, further comprising:
22. The heat dissipation structure board according to claim 2,
23. The heat dissipation structure board according to claim 3,
24. The heat dissipation structure board according to claim 4,
25. The heat dissipation structure board according to claim 5,
26. The heat dissipation structure board according to claim 6,
TECHNICAL FIELD The present invention relates to a heat dissipation structure board used in a hybrid vehicle such as a mild hybrid vehicle, an electric vehicle or an industrial device, a module using the heat dissipation structure board and a method of manufacturing the heat dissipation structure board.
BACKGROUND ART Recently, attention has been paid to a hybrid vehicle or a variety of industrial devices realizing low power consumption by accumulating regenerative electric power during braking or the like in an electric double layer capacitor or the like.
FIG. 34 is a cross-sectional view showing an example of a conventional heat dissipation board. In FIG. 34, conductor circuit 3 is fixed onto metal board 1 via first insulating adhesive layer 2. Conductor layer for circuit (�circuit conductor layer�) 5 is further formed on conductor circuit 3 via second insulating adhesive layer 8. Conductor circuit 3 is connected to circuit conductor layer 5 by via hole 6. However, there is a limit to such a conventional heat dissipation board for reinforcing a peel strength of circuit conductor layer 5.
For example, when a part of circuit conductor layer 5 is formed as an external lead terminal part and pulled as indicated by arrow 7, it is only an adhesive force of insulating adhesive layer 8 that resists this �tensile force�. As a result, it is difficult to deal with vibration resistance (for example, an acceleration test of about 4 G to 20 G is conducted in XYZ directions) as required for on-vehicle devices. Furthermore, even if a thick material such as a lead frame that can deal with a high current and that has a high strength is employed for conductor circuit 3 and circuit conductor layer 5, similar problems occur.
Moreover, there is also proposed a structure of setting a control printed circuit board almost in parallel on a bare-chip-mounted power semiconductor in Patent Document 2. However, it is difficult for the proposed structure to deal with mounting of a large-sized electronic component or an odd-shaped electronic component such as a transformer or a choke coil.
Patent Document 1: Japanese Patent Application No. H09-139580 Patent Document 2: Japanese Patent No. 3,898,158 SUMMARY OF THE INVENTION The present invention has been achieved to solve these conventional problems. It is an object of the present invention to provide a heat dissipation structure board, a module using the heat dissipation structure board and a method of manufacturing the heat dissipation structure board using lead frames capable of dealing with high current and having a mechanical strength as wirings constituting a heat dissipation board, intended to increase a fixing strength of fixing the lead frames to other components (such as a fixing strength of an interface between a heat transfer layer and lead frames or a fixing strength of an interface between the heat transfer layer and a metal plate), and capable of dealing with mounting of heat-generation components such as power semiconductor. It is also an object of the present invention to provide the heat dissipation structure board, the module using the heat dissipation structure board and the method of manufacturing the heat dissipation structure board capable of fixing a large-sized or an odd-shaped electronic component, such as a transformer, a choke coil or an electronic double layer capacitor, conventionally difficult to fix at high strength.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an example of a resin structure used to increase strengths of connection wiring parts of a heat dissipation structure board.
REFERENCE MARKS IN THE DRAWINGS 10 Heat dissipation structure board
11 Resin structure
13 Wiring hole
15 a, 15 b Concave part
16 Heat dissipation board
17 Lead frame
18 Heat transfer layer
19 Metal plate
20 Connection wiring
23 Heat transfer resin
24 Printed circuit board
25 Ordinary electronic component
27 Solder
28 Dotted line
29 Odd-shaped electronic component
30 Fixing member
31 Connection part
32 Coil member
33 Core part
34 Coil part
35 Guide groove
36 Guide hole
37 Connector pin
39 Connection terminal part
41 Sealing material
43 Insertion part
44 Chassis
45 Bare chip
46 Bonding wire
47 Fixing layer
48 Metal foil pattern
49 Buffer structure part
100 Connection part
101 Reinforcement part
102 Guide part
103 Terminal part
104 Holding part
DETAILED DESCRIPTION OF THE INVENTION It is to be noted that manufacturing steps shown in embodiments of the present invention are partially executed using a molding die. However, the molding die is not shown unless it is necessary to be shown for describing. Moreover, the figures are schematic diagrams and do not show positional relations in a dimensionally correct manner. Furthermore, contents mentioned in different embodiments can be combined.
First Embodiment A structure of a resin structure employed to increase a strength of a heat dissipation structure board will be described below as a first embodiment of the present invention.
FIG. 1 is a perspective view showing an example of a resin structure employed to increase strengths of connection wirings of a heat dissipation structure substrate. In FIG. 1, heat dissipation structure board 10 is configured to include resin structure 11, attachment holes 12, wiring holes 13, opening 14, concave parts 15 a and 15 b, heat dissipation board 16, lead frames 17, heat transfer layer 18, metal plate 19, connection wirings 20 and screws 22.
Concave parts 15 a shown in FIG. 1 are portions obtained by denting a part of resin structure 11 and bases of connection wirings 20 are selectively pressed against concave portions 15 a by, for example, denting a part of resin structure 11. The details thereof will be described below with reference to FIG. 4B and the like.
Concave parts 15 b shown in FIG. 1 are concave portions partially provided on sheet-like heat transfer layer 18 or, for example, portions of traces of providing connection wirings 20 by peeling off a part of each of lead frames 17 fixed so as to be buried in transfer layer 18. By thus peeling off a part of each of lead frames 17, a predetermined creepage distance of insulation can be obtained between metal plate 19 and each lead frame 17 to make it possible to handle a primary circuit.
In FIG. 2, a part of each of lead frames 17 is bent in, for example, peripheral edges of heat dissipation board 16 so as to be almost perpendicular to metal plate 19 in a state in which lead frames 17 remain parallel to one another. This part is referred to as �connection wiring 20�. As indicated by arrow 21 in FIG. 2, resin structure 11 is attached onto heat dissipation board 16 to constitute heat dissipation structure board 10.
It is preferable to provide connection part 100, such as screw 22, connecting resin structure 11 to one of or more of metal plate 19 and heat transfer layer 18 (it is to be noted that �more of� includes both of metal plate 19 and heat transfer layer 18) or any one of or more than one of one of or more of metal plate 19 and heat transfer layer 18 and a chassis of a device fixing metal plate 19 (it is to be noted that the chassis includes a device housing or the like and that neither the chassis nor the housing are shown). Connection part 100 corresponds to, for example, a structure that is a combination of one screw 22 provided on each peripheral edge of resin structure 11 and one attachment hole 12 fixed by screw 22.
In this way, wiring holes 13 and attachment holes 12 are appropriately formed in the peripheral edges or the like of resin structure 11. Further, concave parts 15 a are formed in outer peripheral portions of wiring holes 13 (particularly in a portion visible from outside). By forming these concave parts 15 a, adhesion between resin structure 11 and heat dissipation board 16 or heat dissipation structure 10 is improved. Moreover, an effect of improving performance of insertion of connection wirings 20 into respective wiring holes 13 is produced. Furthermore, even after resin structure 11 is fixed to heat dissipation board 16 to constitute heat dissipation structure board 10, an electric characteristic check can be conducted using these concave parts 15 a. It is to be noted that concave parts 15 a may be provided as necessary. By making concave parts 15 a large, an opening on one side surface of each wiring hole 13 (or wiring hole 13) can be formed into a groove. Alternatively, each wiring hole 13 may be formed into an elongated groove.
In this way, resin structure 11 can increase any one of or more than one of the adhesion strength between a part of or more than a part of each lead frame 17 and heat transfer layer 18, the adhesion strength between heat transfer layer 18 and metal plate 19 and the mechanical strength of each connection wiring 20. Such reinforcement parts 101 correspond to, for example, concave parts 15 b formed in connection wirings 20 shown in FIG. 1, respectively. Reinforcement parts 101 are intended to cause concave parts 15 a provided in resin structure 11 to press lead frames 17 against heat transfer layer 18.
Second Embodiment An example of a method of manufacturing heat dissipation board 16 or heat dissipation structure board 10 described in the first embodiment will be described as a second embodiment with reference to FIGS. 3A, 3B, 4A and 4B.
In FIG. 4A, a part of each lead frame 17 buried in heat transfer layer 18 is pulled up (or peeled off) to provide connection wiring 20 or a terminal part (not shown). The part peeled off from heat transfer layer 18 is defined as concave part 15 b and as a creepage distance of insulation between metal plate 19 and connection wiring 20, thereby improving insulation properties. While the peeled part is bent almost perpendicularly to provide connection wiring 20 in FIGS. 4A and 4B, a bending angle of the peeled part (or whether to bend the part or not) is selected according to purposes.
As shown in FIG. 4B, concave parts 15 a and 15 b are formed in parts of resin structure 11 (for example, in parts of an outer peripheral surface of resin structure 11 or parts of the outer peripheral surface thereof which parts come into contact with heat dissipation board 16). With this structure, it is possible to easily confirm, for example, whether or not lead frames 17 can be inserted into respective wiring holes 13 formed in resin structure 11. Furthermore, adhesion between resin structure 11 and each lead frame 17 can be thereby improved.
As shown in FIG. 4B, each connection wiring 20 formed in heat dissipation board 16 is fitted into resin structure 11. Furthermore, using screws 22 or the like, resin structure 11 is mechanically fixed onto metal plate 19 and the like of heat dissipation board 16, thus providing heat dissipation structure board 10. Arrow 21 a shown in FIG. 4B indicates �a pressing force� generated by each screw 22 and resin structure 11. Arrow 21 b indicates an external force applied to each connection wiring 20 from outside or the like. For example, even if the external force indicated by arrow 21 b, for example, a tensile force indicated by arrow 21 b is generated, the force can be cancelled by the pressing force indicated by arrow 21 a. As a result, the external force (such as the tensile force) is not transmitted to an interface between each lead frame 17 and heat transfer layer 18, an interface between heat transfer layer 18 and metal plate 19 or both of the interfaces. Due to this, it is possible to prevent occurrence of peeling, for example, peeling at the interface between each lead frame 17 and heat transfer layer 18.
It is to be noted that concave part 15 a shown in FIG. 4A and the like is obtained by opening or denting one side surface of or more than one side surface of each wiring hole 13 formed in resin structure 11. In this way, by forming concave part 15 a in a part of resin structure 11, a fixing strength of fixing resin structure 11 to each lead frame 17 can be reinforced. The reason is as follows. Even if a warp or a swell is generated on heat dissipation board 16, resin structure 11 or the like, resin structure 11 reliably comes into contact with each lead frame 17 on a side on which no concave part 15 a or 15 b is provided, that is, on lead frame 17-side.
Third Embodiment Members used for heat dissipation board 16, heat dissipation structure board 10 or the like will be described as a third embodiment.
In this case, inorganic filler having, for example, a generally spherical shape and a diameter not less than 0.1 micrometer and not more than 100 micrometers is appropriate as the filler. If the diameter is less than 0.1 micrometer, it is difficult to disperse the filler into the resin. If the diameter exceeds 100 micrometers, transfer layer 18 becomes thick and the thickness of transfer layer 18 influences thermal diffusion performance. In the third embodiment, the filler made of a mixture of two types of alumina, that is, one with an average grain size of three micrometers and the other with an average grain size of 12 micrometers is used as the inorganic filler. By using the alumina of the large grain size and that of the small grain size, the alumina of the small grain size can be filled up into gaps among the alumina of the large grain size and the alumina can be filled up at high concentration close to 90 weight %. As a result, the heat conductivity of heat transfer layer 18 becomes about 5 W/(m�K).
Fourth Embodiment A case where a module is constituted by combining heat dissipation board 16 or heat dissipation structure board 10 described in the first embodiment with a printed circuit board will be described as a fourth embodiment.
Fifth Embodiment A manner of fixing an electronic component such as a large-sized component or an odd-shaped component (hereinafter, �odd-shaped electronic component�), for example, a transformer, a choke or a connector using resin structure 11 described with reference to FIG. 1 and the like will be described as a fifth embodiment with reference to the drawings.
�Odd-shaped electronic component 29� is defined as a general term of a transformer, a coil component such as a choke coil, an electric double layer capacitor or a battery device such as a lithium ion battery or a large-sized, an odd-shaped or a heavy electronic component. It is to be noted that an electronic component such as a chip component that can be surface-mounted on printed circuit board 24 is referred to as �ordinary electronic component 25�. A power semiconductor or the like may be either ordinary electronic component 25 or odd-shaped electronic component 29. If resin structure 11 increases or improves an attachment strength and vibration resistance thereof, the power semiconductor or the like can be handled as odd-shaped electronic component 29. Whether an electronic component is odd-shaped electronic component 29 or ordinary electronic component 25 may be determined according to a degree of demand of the attachment strength, a degree of demand of heat dissipation or the like.
It is useful that a part of resin structure 11 holds at least a part of (�at least a part of� includes �all of�) odd-shaped electronic component 29. Furthermore, by causing not only resin structure 11 but also connection wirings 20 to hold at least a part of odd-shaped electronic component 29, the fixing strength of fixing odd-shaped electronic component 29 can be increased. The structure fixed to any one of or more than one of metal plate 19 and heat transfer layer 18 or a chassis of a device fixing metal plate 19 is provided on each connection wiring 20. With this structure, odd-shaped electronic component 29 can be fixed indirectly to any one of or more than one of metal plate 19 and heat transfer layer 18 and the chassis (including a housing or the like) of the device fixing metal plate 19 with high strength.
FIG. 10B is a cross-sectional view showing a manner of fixing resin structure 11 to which odd-shaped electronic component 29 is fixed by screws 22 a to heat dissipation board 16 (not shown), the chassis of the device or the like by screws 22 b. In FIG. 10B, attachment holes 12 are provided in a side surface or the like of odd-shaped electronic component 29. By inserting screws 22 or the like into these holes 12 as indicated by arrow 21, odd-shaped electronic component 29 is fixed to resin structure 11. In this manner, it is useful to provide attachment parts or the like of odd-shaped electronic component 29 in a part of resin structure 11.
As described above, by providing heat dissipation board 16 configured so that one of or more than one of external connection part 31 of odd-shaped electronic component 29 is protruded or exposed to a surface of each connection wiring 20 which surface is out of contact with metal plate 19, it is possible to improve the degree of freedom of wiring and installation of odd-shaped electronic component 29. �Exposed� means a state in which it suffices that a part of odd-shaped electronic component 29 is visible from the surface. If it is necessary, an exposed part is protruded similarly to terminal 31 shown in FIG. 12B, it is possible to connect odd-shaped electronic component 29 to another printed circuit board (not shown).
Sixth Embodiment A case of mounting odd-shaped electronic component 29 in module 26 described with reference to FIG. 6 and the like will be described with reference to FIG. 14 as a sixth embodiment.
Seventh Embodiment In a seventh embodiment, reinforcement of strength of an electronic component mounted on heat dissipation board 16 will be described with reference to FIGS. 15A and 15B.
Eighth Embodiment In an eighth embodiment, a case of providing terminal part 39 that can connect a part of each connection wiring 20 to an external circuit via resin structure 11 will be described.
FIG. 16 shows guide groove 35, guide holes 36, connector pins 37, connector 38 and connection terminal part 39. It is to be noted that examples of guide groove 35 include a guide groove in a shape called �introduction guide� or the like. Examples of guide holes 36 include a concave in a recess shape without penetration and a through-hole. FIG. 16 does not show a cable or the like connected to connector 38.
Ninth Embodiment In a ninth embodiment, reinforcement of strengths of fixedly bonded parts such as lead frames 17 if lead frames 17 are not buried in heat transfer layer 18 will be described with reference to FIG. 18.
Tenth Embodiment In a tenth embodiment, reinforcement of strength of heat dissipation board 16 or heat dissipation structure board 10 formed using resin structure 11 will be described with reference to FIG. 20.
FIG. 22 is a perspective view describing a case of providing one or more resin structures 11. As indicated by arrow 21 shown in FIG. 22, connection wiring 20 is inserted into attachment hole 12 b formed in resin structure 11 b. Thereafter, this resin structure 11 b is fitted into attachment hole 12 a formed in resin structure 11 a. With this structure, resin structure 11 b can protect entire surfaces of a periphery of connection wiring 20. As for resin structure 11 b shown in FIG. 22, by forming a plurality of attachment holes 12, it is possible to make positional corrections (including positional deviation prevention), bending prevention and short prevention among a plurality of connection wirings 20.
While FIG. 22 shows that resin structure 11 a protect surroundings of a heat dissipation board (not shown), resin structure 11 a does not necessarily protect all of the surroundings. Resin structure 11 a can selectively protect necessary parts, necessary sides, a central portion or the like of the heat dissipation board. In such a case, a shape of resin structure 11 a is not limited to a shape (a kind of a picture frame shape) shown in FIG. 20 but may be a rod shape (including an L-shape or a U-shape). Furthermore, if resin structure 11 a is a plate-like structure, resin structure 11 a can entirely cover up or protect lead frames 17 formed on heat dissipation board 16.
Eleventh Embodiment In an eleventh embodiment, a manner of mounting odd-shaped electronic component 29 in module 26 or the like formed using resin structure 11 will be described with reference to FIGS. 26 to 27A and 27B.
Moreover, as shown in FIGS. 27A and 27B, wiring holes 13 formed in resin structure 11 protect connection wirings 20 of heat dissipation board 16. Further, by providing concave parts 15 a and 15 b in a part of resin structure 11, each lead frame 17 serving as a base of each connection wiring 20 can be efficiently pressed against heat dissipation board 16-side and bonding strength of bonding lead frame 17 is increased. By thus providing concave parts 15 a and 15 b, it is possible to reliably bring resin structure 11 into contact with lead frames 17 even if a warp or a swell is generated on heat dissipation board 16 or resin structure 11.
Twelfth Embodiment In a twelfth embodiment, reinforcement of strengths of connection wirings 20 of heat dissipation board 16 using resin structure 11 will be described with reference to FIGS. 28 to 31.
As shown in FIG. 30A, resin structure 11 is fixed to metal plate 19 and further to chassis 44 by screws 22 or the like, a fixing force indicated by arrow 21 is generated in lead frame 17. As a result, even if a tensile force (arrow 21) is generated, the fixing force indicated by arrow 21 a cancels this tensile force (arrow 21).
Thirteenth Embodiment In a thirteenth embodiment, a case where each lead frame 17 used for heat dissipation board 16 is a multilayer body including lead frame 17 and a metal foil pattern will be described with reference to FIGS. 32A and 32B.
INDUSTRIAL APPLICABILITY The heat dissipation structure board according to the present invention is useful as a heat dissipation structure used in a hybrid vehicle such as a mild hybrid vehicle, an electric vehicle or an industrial device.
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H01L23/498L, H01L23/373LLegal EventsDateCodeEventDescriptionSep 22, 2009ASAssignmentOwner name: PANASONIC CORPORATION,JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OHNISHI, TOHRU;KOUNO, HITOSHI;TANIGUCHI, TOSHIYUKI AND OTHERS;SIGNED BETWEEN 20090623 AND 20090629;US-ASSIGNMENT DATABASE UPDATED:20100415;REEL/FRAME:23265/702Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OHNISHI, TOHRU;KOUNO, HITOSHI;TANIGUCHI, TOSHIYUKI;AND OTHERS;SIGNING DATES FROM 20090623 TO 20090629;REEL/FRAME:023265/0702Owner name: PANASONIC CORPORATION, JAPANRotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google