Electricity: conductors and insulators – Conduits – cables or conductors – Preformed panel circuit arrangement
Patent
1996-04-08
1997-10-14
Sough, Hyung S.
Electricity: conductors and insulators
Conduits, cables or conductors
Preformed panel circuit arrangement
174255, H05K 105
Patent
active
056775148
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to a metal-core PC board for insertion into the housing of an electronic device. The core consists of two metal plates joined together and spaced apart by metal ribs, on the outer surfaces of which core multilayer insulating layers are provided. The marginal areas of at least two opposite lateral edges of the metal-core PC board are not coated.
The requirements for such metal-core PC boards, which are usually populated with electronic components, specify in particular, that the heat generated during operation of the electronic components can be conducted away well, that high dimensional stability of the board is thus guaranteed so as not to endanger the printed conductors, and that low weight is also achieved to make the electronic devices equipped with the boards correspondingly light.
A metal-core PC board for insertion into a housing of an electronic device, with the core consisting of two metal plates spaced apart from one another and connected together by metal ribs, with multilayer insulating layers being provided on the outer surfaces of the core, and with the marginal areas of at least two opposite lateral edges of the metal-core PC board not being coated (sliding margins) is known from European Patent document EP-0 124 128 A1.
A metal-core PC board is also known from German Patent document DE-88 11 949 U1 whose edges can be clamped by a spreading device to secure them in a housing. In this known board, heat is advantageously conducted away from the metal-core PC board into the housing.
It has been shown that individual measures like those known from the European publication EP-0 124 128 A1 which constitutes the species or from the German publication DE-88 11 949 U1 are insufficient to meet the requirements imposed on metal-core PC boards regarding high dimensional stability, low weight, and good heat dissipation.
Hence the goal of the present invention is to provide a metal-core PC board of the above-mentioned type which exhibits high dimensional stability when exposed to temperature differentials, allows optimal heat dissipation through the housing, and is also low in weight.
This goal is achieved according to the present invention by a metal-core PC board for insertion into a housing of an electronic device, with the core consisting of two metal plates spaced apart from one another and connected together by metal ribs, with multilayer insulating layers being provided on the outer surfaces of the core, and with the marginal areas of at least two opposite lateral edges of the metal-core PC board not being coated (sliding margins). The core consists of aluminum or an aluminum alloy. Copper-invar (nickel steel) layers are applied to the outer surfaces of the core. A polyimide insulating layer composed of several layers is applied to the copper-invar layers. The marginal areas, i.e., the sliding margin (g), is free of ribs and the corresponding metal plates can be spread apart in the vicinity of the sliding margin (g) through the use of gibs and cotters.
By making the metal core of aluminum or an aluminum alloy, especially good heat conduction and hence heat dissipation is achieved. The stiffening ribs serve for heat compensation. By placing the plastic cover layer on top of the copper-invar layer, improved heat conduction into the metal core and from the latter to the housing is achieved.
The thickness, spacing, and number of the metal plates or plastic films are preferably chosen as will be described herein.
Securing the metal-core PC board in the housing through the use of a gib and cotter in an area of the sliding margin that is kept free of any reinforcing ribs contributes to the heat transfer between the metal-core PC board and the housing due to the increased bilateral fit of the metal plates against the grooved wall of the housing.
In a preferred embodiment of the invention, the gib and cotter is fastened to one of the metal plates. By fastening the gib and cotter to one of the metal plates, the need for manual adjustment is elimi
REFERENCES:
patent: 3405227 (1968-10-01), Hazlett
patent: 3475656 (1969-10-01), Hepker
patent: 4916575 (1990-04-01), Van Asten
Ding Kurt
Schwamm Friedrich
Ghosh Paramita
MTU Motoren - und Turbinen-Union Muenchen GmbH
Sough Hyung S.
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