Laser symbolization on copper heat slugs

Details Laser symbolization on copper heat slugs Laser symbolization on copper heat slugs

1995-12-20

1997-09-09

Burr, Edgar S.

Printing

Processes

With heating or cooling

101483, B41F 2304

Patent

active

056644973

ABSTRACT:
The invention is to a method of placing symbolization on a heat spreader, used in conjunction with the semiconductor package, through the use of a low powered laser beam. The beam is scanned over the package surface at a preset intensity and for a desired time to change the surface texture of the heat spreader, and to change the reflectivity of the scanned area.

REFERENCES:
patent: 4177372 (1979-12-01), Kotera et al.
patent: 4592977 (1986-06-01), Naganuma et al.
patent: 4834834 (1989-05-01), Ehrlich et al.
patent: 5196286 (1993-03-01), Watkins
patent: 5304357 (1994-04-01), Sato et al.

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