Laser marking method and ablative coating for use therein

Details Laser marking method and ablative coating for use therein Laser marking method and ablative coating for use therein

1987-01-09

1987-11-17

James, Andrew J.

357 65, 357 74, 357 71, 357 68, H01L 2306

Patent

active

047077220

ABSTRACT:
Laser marking of metal surfaces, particularly semiconductor device packages, is accomplished by depositing an electroless nickel layer on the surface, converting the nickel surface to a form in which it is highly absorptive of radiant energy and exposing the converted nickel surface to laser energy through a mask. The resulting mark is highly resistant to abrasion and corrosion. In addition, the method is highly suitable for use with automated laser marking equipment. Furthermore, it appears that the presence of the converted electroless nickel surface in the region of welds increases the hermeticity of the welds. This is particularly useful in packages of the TO-3 type and similar types.

REFERENCES:
patent: 4233107 (1980-11-01), Johnson
Johnson-Black Electroless Nickel Surface Morphologies with Extremely High Light Absorption Capacitor--Metal Finishing--Jul. 1980, pp. 21-24.

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