THICK FILM HYBRID INTEGRATED CIRCUIT BOARD

摘要

PURPOSE:To perform laser trimming without restriction of a patter disposition between upper and lower layers by irradiating only a resistor along a trimming line set on the resistor with a laser light. CONSTITUTION:A straight trimming line of a cutout 11 which advances in a width W direction of a resistor 9, is so set only on the resistor 9 from a cutout starting position 11a to an ending position 11b as to be disposed on a conductor line. The resistor 9 to be laser trimmed is electrically insulated from the pattern of the lower layer. The trimming uses a YAG laser to irradiate only the resistor 9 along the trimming line with laser light. The resistor 9 and an insulating layer of its lower layer are cut out by irradiation with the light, and hence the trimming can be conducted only in the resistor in a shallow cutout depth.