Marking of an anodized layer of an aluminium object
AssigneeKoninklijke Philips Electronics N.V.
InventorKeng Kit Yeo
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Abstract
A marking (3 to 5) is provided in a surface (8) of an element (1) which comprises a substrate (6) of aluminum or an alloy thereof and an anodized outer layer (7) in that a region (10) of the surface (8) is irradiated with a laser beam such that at least one visual property of the surface (8) in said region (10) is changed and a visual marking (3 to 5) is obtained which is observable to the human eye. The laser beam penetrates the anodized outer layer (7) at least to a major degree and induces the change in the at least one visual property substantially locally only in a zone (9) where the anodized outer layer (7) adjoins the substrate (6).
Claims4
An element comprising a substrate consisting of aluminum or an alloy thereof and having an anodized outer layer which forms a surface of the element, while a region of said surface has at least one visual property which differs from the corresponding visual property of adjoining portions of said surface and forms visual marking which is observable to the human eye, characterized in that said element exhibits said change in said at least one visual property substantially exclusively locally in a zone in which said anodized outer layer adjoins said substrate.
Dependencies are inferred from the claim text.