Source: http://www.google.com/patents/US7606038?dq=7565338
Timestamp: 2016-08-25 15:40:02
Document Index: 210036443

Matched Legal Cases: ['art 20', 'art 20', 'art 20', 'art 20', 'art 20', 'art 20', 'art 20', 'art 20']

Patent US7606038 - Method for producing a printed circuit board with a heat radiating structure ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA first surface of a double-sided printed circuit board has a soldering land for heat radiation, which serves as a mounting surface for an electronic part. A land for solder absorption is formed on the second surface facing the mounting surface. Viaholes are provided and open in both the soldering land...http://www.google.com/patents/US7606038?utm_source=gb-gplus-sharePatent US7606038 - Method for producing a printed circuit board with a heat radiating structure and a printed circuit board with a heat radiating structureAdvanced Patent SearchPublication numberUS7606038 B2Publication typeGrantApplication numberUS 11/903,154Publication dateOct 20, 2009Filing dateSep 20, 2007Priority dateSep 20, 2006Fee statusPaidAlso published asEP1903839A2, EP1903839A3, EP1903839B1, US20080186682Publication number11903154, 903154, US 7606038 B2, US 7606038B2, US-B2-7606038, US7606038 B2, US7606038B2InventorsYoshiaki SugimuraOriginal AssigneeSumitomo Wiring Systems, Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (31), Non-Patent Citations (1), Referenced by (8), Classifications (22), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetMethod for producing a printed circuit board with a heat radiating structure and a printed circuit board with a heat radiating structure
US 7606038 B2Abstract
A first surface of a double-sided printed circuit board has a soldering land for heat radiation, which serves as a mounting surface for an electronic part. A land for solder absorption is formed on the second surface facing the mounting surface. Viaholes are provided and open in both the soldering land for heat radiation and the land for solder absorption at the opposite ends. Molten solder flows out from the openings of the viaholes and spreads on the land for solder absorption to suppress formation of solder balls. Cream solder is applied to the outer surface of the land for solder absorption to embed the solder and to form a solder layer.
Accordingly, solder that flows into viaholes is prevented from being formed into solder balls. Thus, a metal mask does not become uneven and the metal mask and a squeegee used for cream application are not damaged when mounting the metal mask to apply cream solder to lands.
FIG. 1 show an essential portion of a printed circuit board according to the invention, wherein FIG. 1(A) is a section, FIG. 1(B) is a plan view and FIG. 1(C) is a bottom view.
A double-sided printed circuit board in accordance with the invention is identified by the numeral 100 in FIG. 1(A). The circuit board 100 has a substrate 12 with opposite first and second surfaces 12 a and 12 b. The substrate 12 is made of an insulating material, such as epoxy. First and second conductor patterns 13A and 13B are provided respectively on the first and second surfaces 12 a, 12 b of the insulating substrate 12. The conductor patterns 13A and 13B are made of conductive material, preferably conductive foil material, such as copper foil, and are referred to collectively by the numeral 13. An electronic part 20 is mounted on the first surface 12 a. The electronic part 20 includes an IC chip to which a large current can be applied.
Lead terminals 20 b, 20 c project from the bottom left and right surfaces of a case 20 a of the electronic part 20, and a heat sink 21 is attached to a surface of the electronic part 20 that faces towards first surface 12 a of the substrate 12 of the printed circuit board 100. The lead terminals 20 b, 20 c of the electronic part 20 are solder-connected to lands 16, 17 of the conductor patterns on the first surface 12 a for mounting the electronic part 20 on the first surface 12 a. A soldering land 22 for heat radiation is defined by exposing the copper foil on the first surface 12 a of the substrate 12 of the printed circuit board 100. Thus, the soldering land 22 for heat radiation faces the mounting side of the electronic part 20 where the heat sink 21 is provided. The soldering land 22 for heat radiation is surrounded by a solder resist 18. Viaholes 24 are formed through the substrate 12. Each viahole 24 has a first opening 24 a at a portion of the first surface 12 a of the substrate 12 corresponding to the soldering land 22 for heat radiation. Each viahole 24 also has a second opening 24 b at the second surface 12 a of the substrate 12. The viaholes 24 are arranged to define a matrix array at substantially the same intervals in forward and backward directions and transverse directions. In this embodiment, as shown in FIG. 2, four viaholes 24 are arranged in transverse direction and three are arranged in forward and backward directions to provide a total of twelve viaholes 24. However, the number of the viaholes 24 can be suitably selected according to the size of the electronic part 20 and/or the heat to be dissipated. Each viahole 24 has a conductive inner surface formed, for example, by plating (e.g. “Through Hole Plated” (THPlated)). The viaholes 24 are not used as component holes, but rather serve as interlayer connections for connecting conductive layers or patterns on the two surfaces 12 a and 12 b. The copper foil at portions of the second surface 12 b of the substrate 12 adjacent the second openings 24 b of the viaholes 24 is exposed to define a land 25 for solder absorption. The land 25 for solder absorption has substantially the same area as the soldering land 22 for heat radiation and the two lands 22, 25 are substantially registered in the thickness direction TD.
The flat solder depositions 31 are formed at the second openings 24 b of the viaholes 24 at the land 25 for solder absorption when the molten solder is solidified and are part of a unitary matrix of solder that extends through the viaholes 24. The height of the solder depositions 31 is smaller than thickness “t” of a metal mask 40.
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