Patent ID: 6229098
Filing Date: 2001-05-08
Classification: H01C,H05K

Abstract:
A printed circuit board comprising:a substrate;a photoimageable layer on the substrate, the photoimageable layer having an opening in a surface of the photoimageable layer, the opening being characterized by a first opening dimension, a second opening dimension transverse to the first opening dimension, and a depth equal to a thickness of the photoimageable layer, the photoimageable layer being a permanent dielectric layer of the printed circuit board; anda resistive mass within the opening, the resistive mass comprising carbon particles in a polymeric matrix, the resistive mass having first resistor dimension and a second resistor dimension that are approximately equal to the first opening dimension and the second opening dimension, respectively; the resistive mass having a resistive surface recessed below the surface of the photoimageable layer and a resistor thickness less than the thickness of the photoimageable layer, the resistive mass lying in a plane containing the photoimageable layer, the resistive mass contacting at least two electrical terminals disposed in a plane outside the plane containing the resistive mass and the photoimageable layer.