Patent ID: 9723713
Date: 2017-08-01
CPC Classifications: H05K

Claim:
1. A circuit board comprising: a. one or more rigid sections, wherein each rigid section comprises multiple layers stacked along a Z-direction; b. one or more flexible sections coupled to the one or more rigid sections; and c. one or more radius sections having a pre-formed, steady-state non-linear shape within portions of the one or more flexible sections that extend from the one or more rigid sections such that when the one or more flexible sections are in a steady state condition the one or more radius sections maintain the pre-formed, steady state non-linear shape, and when the one or more flexible sections are subject to movement relative to the one or more rigid sections the one or more radius sections are deformed from the steady state non-linear shape such that stress resulting from the relative movement is distributed across a length of the one or more radius sections, wherein the one or more radius sections have the preformed, steady-state non-linear shape along an X-Y plane perpendicular to the Z-direction and through an entire thickness of the one or more flexible sections, and a pre-formed, steady-state linear shape along the Z-direction further wherein the one or more radius sections are unsupported, further comprising a mechanical strengthener layer positioned at one or more transition locations between each of the one or more rigid sections and a corresponding adjacent one of the one or more flexible sections, wherein a first portion of the mechanical strengthener layer extends partially into the rigid section and a second portion of the mechanical strengthener layer extends partially into the corresponding adjacent flexible section.