| 摘要 |
A thin sheet of electrical grade aluminum is secured to a thin substrate sheet of epoxy/fiberglass or polyimide/fiberglass to form a multilayer card. This card is processed by printed circuit techniques to form the electrical circuit pattern of a printed circuit motor armature. The surface of the aluminum sheet which confronts the substrate sheet is processed in a manner to have a continuous pattern of oblong depressions generally normal to the surface. The major axes of these depressions are generally aligned with each other, and define the direction of the higher adhesion strength. The major axes of these depressions are in alignment with the direction of the electrical conductors constituting the armature circuit pattern. The aluminum surface, containing these depressions, includes a thin, clear, continuous unsealed anodized coating.
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