Double Access or Back Bared Flex Circuits
Double access flex, also known as back bared flex, are circuits with a single conductor layer which is processed in a manner that allows access to the conductors form both sides.
Applications:
Medical / Environmental / Test and Measurements / Automotive and other general electronic devices
Rigid-Flex Circuit:
Rigid-flex circuits are of a hybrid construction consisting of rigid and flexible substrates laminated together into a single package and electrically interconnected by means of plated through holes. Such flexible circuit types have enjoyed tremendous popularity among military product designers, but have in recent years made gains in the commercial world. Rigid-flex boards are normally multilayer designs, however double-sided (tow metal layer) constructions are possible, and have been used in certain microelectronic applications.
Applications:
Aerospace, all types of electronics used in Military Devices, Consumer Electronics where feature and space is critical, such as laptop computers