Method and apparatus for adjusting electrical networks consistin

Details Method and apparatus for adjusting electrical networks consistin Method and apparatus for adjusting electrical networks consistin

1977-05-16

1979-04-10

Truhe, J. V.

Electric heating

Metal heating

By arc

29620, B23K 900

Patent

active

041490649

ABSTRACT:
A method and apparatus for adjusting an electrical characteristic of an electrical component of an electrical network which network comprises a stack of secured together foils or layers which include one or more synthetic foils each having a metal layer on one or both surfaces and a cover foil and has connecting wires which are fused through the cover foil and welded to the desired spots on a metal layer characterized by trimming at least one of the metal layers to obtain the desired electrical characteristic by directing a laser beam through at least one foil and focusing the beam on the metal layer being trimmed. To prevent inadvertent and undesired trimming of a metal layer while trimming a given metal layer, one of the synthetic carrier foils may be of a material which is impervious to the laser beam or may be provided with a reflective metal layer. To practice the invention, the laser beam is focused and deflected by an apparatus which is controlled by a program device which adjusts the rate of deflection in response to the desired geometry and theoretical values for the electrical characteristic and the electrical characteristic of the layer being trimmed is measured by a measuring bridge which will emit a signal when the desired characteristic is obtained to stop the operation of the laser beam.

REFERENCES:
patent: 3453097 (1969-07-01), Hafner
patent: 3768157 (1973-10-01), Buie
patent: 3827142 (1974-08-01), Bennett
patent: 3913224 (1975-10-01), Preissinger et al.
patent: 4065656 (1977-12-01), Brown et al.

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