Rigid-flex electronic module
Rigid-flex-type circuit-board structure and manufacturing method, in which a flexible membrane and a sacrificial-material piece are attached to an insulator membrane in the location of the flexible zone. An insulator layer, which encloses within itself a sacrificial-material piece is manufactured on the surface of the conductor membrane. The flexible zone is formed in such a way that an opening is made in the insulator layer, through which the sacrificial-material piece is removed. The flexible zone comprises at least part of the flexible membrane as well as conductors, which are manufactured by patterning the insulator membrane at a suitable stage in the method.
1. A rigid-flex electronic module, comprising an insulator layer having a first surface and a second surface; a first rigid zone, at least one second rigid zone and at least one flexible zone between the first rigid zone and at least one second rigid zone defined in the electronic module, the at least one flexible zone having a higher flexibility than the first and second rigid zones and the electronic module comprising a flexible membrane extending at least over the flexible zone; a layer of conductors running on the first surface of the insulator layer, a first portion of the layer of conductors being in the first rigid zone, a second portion of the layer of conductors extending further over the flexible zone, the flexible membrane supporting said second portion of the layer of conductors, and a third portion of the layer of conductors being in the at least one second rigid zone; at least one first component having on a first surface contact terminals, the at least one first component located inside the insulator layer in the first rigid zone such that the contact terminals face towards the conductors on the first surface of the insulator layer; at least one second component having on a first surface contact terminals, the at least one second component located inside the insulator layer in the at least one second rigid zone such that the contact terminals face towards the conductors on the first surface of the insulator layer; and contact elements between the contact terminals of each of the components and the respective conductors on the first surface of the insulator layer, the contact elements being unified metal pieces formed by at least one layer of metal grown by at least one of: a chemical growing method and an electrochemical growing method, wherein the at least one flexible zone is folded.
2. The electronics module according to claim 1 , in which the insulator layer contains at least one layer of a fibre material, the fibre material having an opening for a component, as well as a unified polymer layer, which is attached to the fibre material and the component.
3. The electronics module according to claim 1 , which comprises a polymer layer between the conductors and the components, the polymer layer having contact holes for the contact elements, and in which the contact elements fill the contact holes entirely.
4. The electronics module according to claim 3 , in which the polymer layer is local, in such a way that it is present essentially only in the locations of the components.
5. The electronics module according to claim 1 , wherein each rigid zone comprises a second layer of conductors on the second surface of the insulator layer.
6. The electronics module according to claim 1 , wherein the electronics module is folded at the flexible zone such that the rigid zones are located on top of each other.
7. A rigid-flex electronics module, which comprises
at least three rigid zones connected to each other by means of flexible zones;
the flexible zones each comprising a flexible membrane and conductors, which run over the flexible zone supported by the flexible membrane;
the at least three rigid zones each comprising an insulator layer and a layer of conductors on a first surface of the insulator layer;
at least one of the rigid zones further comprising at least one component embedded in the insulator layer and having contact terminals facing towards the conductors on the first surface of the insulator layer, at least some of the contact terminals being electrically connected to said conductors via contact elements;
wherein the flexible zones are folded; and
wherein the layers of conductors on the first surfaces of the insulator layers of the at least three rigid zones are electrically connected to each other through the conductors of the flexible zones.
8. The electronics module according to claim 1 , in which at least two of the rigid zones comprise at least one component embedded in the insulator layer.
9. The electronics module according to claim 1 , in which at least three of the rigid zones comprise at least one component embedded in the insulator layer.
10. The electronics module according to claim 6 , wherein the electronics module is folded at the flexible zones in such a manner that one of the rigid zones is sandwiched between two other rigid zones.
11. The electronics module according to claim 6 , in which the insulator layer contains at least one layer of a fibre material, the fibre material having an opening for a component, as well as a unified polymer layer, which is attached to the fibre material and the component.