Product name:4L Rigid-flex board
Layers: 4L
Rigid-flex board structure: 1R+2F÷1R
Plate thickness: 1.6mm±0.1mm
Outer layer copper thickness: 1Oz
Inner layer copper thickness: 1 oZ
Minimum aperture: 0.25mm
Minimum line width/space: 4mil
Surface treatment: immersion gold
Application Field: Electron Microscope
Difficulties in the process: higher requirements for expansion and contraction control