Electrical resistors – With inductance-reducing
Patent
1984-11-14
1987-06-02
Goldberg, E. A.
Electrical resistors
With inductance-reducing
338195, 338293, 338307, 219121LJ, 29610R, H01C 302
Patent
active
046707344
ABSTRACT:
A method of making a high-voltage, noninductive, film-type resistor by providing on an insulating substrate a coating of resistive material. A laser beam is then operated to cut through the coating and remove portions so shaped that the remaining coating portions form a zigzag line. The laser cutting is so effected that each zig converges toward the adjacent zag at an angle sufficiently small that there is a major inductance-cancellation effect. Stated more definitely, the laser cutting is done by making an elongated laser cut through the coating to thus expose a portion of substrate beneath the cut, then making another laser cut substantially parallel to the first-mentioned cut and having a length substantially different from that of the first-mentioned cut, thus exposing a portion of substrate beneath such other cut, and then repeating the cutting steps but with cut lengths and positions progressively different in such manner that during the repetitions the laser-beam creates a zigzag line of resistive material.
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Goldberg E. A.
Lateef M. M.
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