Sub-surface marking

Details Sub-surface marking Sub-surface marking

B - Operations, Transporting

23

K

B23K 26/00 (2006.01) B29C 71/04 (2006.01) B41M 5/24 (2006.01) B41M 5/26 (2006.01) B44B 7/00 (2006.01) G06K 1/12 (2006.01) B29C 35/08 (2006.01)

Patent

CA 2049079

- 19 - ABSTRACT SUB-SURFACE MARKING A method and apparatus are described for providing a body of material (14) with sub-surface mark in the form of an area of increased opacity to electromagnetic radiation. The method comprises directing at a surface of the body (14) a high energy density beam (12, 26) to which the material (14) is transparent and bringing the beam (12,26) to a focus at a location spaced from the surface and within the body (14) so as to cause localised ionisation of the material (14). In a prefered embodiment the apparatus includes a laser (10) as a high energy density beam source and provides means (36, 38) to move the focus of the beam (12,26) relative to the body (14) so as to enable the mark to be of a predetermined shape.

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