Sub-surface marking

Details Sub-surface marking Sub-surface marking

1991-08-15

1993-04-27

Berman, Jack I.

Radiant energy

Coded record and readers; invisible radiant energy type

2191216, G06K 710

Patent

active

052064964

ABSTRACT:
A method and apparatus for providing a body of material (14) with sub-surface marking in the form of an area of increased opacity to electromagnetic radiation. The method includes 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 localized ionization 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.

REFERENCES:
patent: 4743463 (1988-05-01), Ronn et al.
patent: 4758703 (1988-07-01), Drever et al.
patent: 4769310 (1988-09-01), Gugger et al.
patent: 4822973 (1989-04-01), Fahner et al.
Technica, vol. 37, No. 2, Feb. 1988, Zurich, pp. 54-56, D. Winkler: "Status Quo Beim Laserbeschriften"p. 55, In. 1-p. 56, ln. 20.
Feinwerktechnik + Messtechnik. vol. 96, No. 7-8, Jul. 1988, DE pp. 308-310; F. Tuma: "Beschriften Mit Laserstrahlen" see the whole document.

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