Printed Circuit Boards

This is a large board for a medical device that

is eighteen layers and presents difficult

registration due to the number of layers and

board’s dimensions.

Application: Medical Imaging

Size: 4.5” by 22.25”

Layers: 18 overall

Four layers flex with four layers of epoxy

silver shielding

Materials: Adhesiveless flex

Polyimide core

Polyimide no flow prepreg

Traces: 7/4 innerlayers

7/5 outerlayers

Minimum hole: .024

Minimum pad: .040

Thickness: .093 ± .005

Other: Silver epoxy shielding