Thick film circuit board and method of manufacturing the same

Details Thick film circuit board and method of manufacturing the same Thick film circuit board and method of manufacturing the same

1994-05-09

1996-09-17

Walberg, Teresa J.

Electrical resistors

Mechanically variable

Resistance value varied by removing or adding material

338308, 338309, 338314, 361766, H01C 112

Patent

active

055572529

ABSTRACT:
A thick film circuit board includes a substrate, a thick film resistor on the substrate and having a trimming region and a protecting element on the substrate for protecting the thick film resistor and having a window through which the trimming region is exposed. The protecting element may be a protective coating disposed on the substrate. Alternatively, the protective element may be a protective frame extending along an external periphery of a region where the thick film resistor is located on the substrate and having a height for protecting the thick film resistor from mechanical damage.

REFERENCES:
patent: 4439754 (1984-03-01), Madden, Jr.
patent: 4580030 (1986-04-01), Takeuchi
patent: 5087961 (1992-02-01), Long et al.
patent: 5168430 (1992-12-01), Nitsch et al.
patent: 5253010 (1993-10-01), Oku et al.

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