Electric heating – Metal heating – By arc
Patent
1990-01-23
1991-04-23
Albritton, C. L.
Electric heating
Metal heating
By arc
21912167, 21912131, B23K 2600
Patent
active
050102320
ABSTRACT:
A method of perforating a printed circuit board having a copper foil layer on one side thereof, at least one intermediate resin layer and a layer on the other side thereof, so as to form a connection hole for providing an electrical connection between the copper foil layer and the layer on the other side of the printed circuit board. The method employs a printed circuit board perforation apparatus which has a laser processing head capable of processing the printed circuit board by means of a laser beam and a drill head capable of driling the printed circuit board. After the apparatus is suitably located with respect to the printed circuit board, the drilling head operates to conduct drilling into the resin layer through the copper foil layer by the drilling head so as to form a pilot hole. Then, the pilot hole is located with respect to the laser processing head and the laser processing head operates to irradiate a laser beam to the portion of the resin layer remaining at the bottom of the pilot hole so as to remove the resin, thereby forming the connection hole reaching the layer on the other side of the printed circuit board. An apparatus for carrying out this method is also disclosed.
REFERENCES:
patent: 4335296 (1982-06-01), Bredow
patent: 4504727 (1985-03-01), Melcher et al.
patent: 4644130 (1987-02-01), Bachmann
patent: 4857696 (1989-08-01), Taenich et al.
F. W. Haning et al., "IBM Technical Disclosure Bulletin", Laminate Fabrication to Facilitate Laser Drilling, vol. 17, No. 18, p. 2258, Jun. 1975.
J. J. Hillebrand, "Feinwerktechnik and Messtechnik", Laserbohren in Organischen Leitenplatten-Material, 91 (1983), pp. 56-58.
Arai Kunio
Kanaya Yasuhiko
Albritton C. L.
Hitachi Seiko Ltd.
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