A method of layering a layer of circuitry pattern to another layer of circuitry pattern during the manufacturing of a multilayer flexible printed circuit in a reel-to-reel machine. The method includes feeding both layers of circuitry pattern reel-to-reel into the machine, placing a layer of dielectric sheet material on the fly between the two layers of circuitry patterns reel-to-reel, followed by simultaneously passing the two layers of circuitry pattern and the dielectric sheet material under a laser scanner in the reel-to-reel machine to irradiate a laser beam on a layer of circuitry pattern to weld the two layers of circuitry patterns together.

A laminated circuit board includes a base having a first surface, and a second surface on an opposite side from the first surface, a first metal layer provided in the base and including a first electrode exposed from the first surface, and a second metal layer provided in the base and including a second electrode exposed from the second surface. The first metal layer includes an inductor electrically connected to the first electrode, and the first electrode and the second electrode are bonded and electrically connected to each other.

A lamination circuit board structure lamination circuit board structure includes a printed circuit board substrate including conductive wiring traces on at least a first wiring face, a prepreg layer formed over the first wiring face, and a patch having an area smaller than 1,000 mm.sup.2. The patch includes conductive wiring traces formed on a wiring face and is laminated to the printed circuit board substrate over the prepreg layer, oriented with the wiring face in contact with and pressed into the prepreg layer. Portions of the prepreg layer fill interstices between the conductive wiring traces

A reel-to-reel method to laser-ablate a circuitry pattern on the fly in a reel-to-reel machine as part of a process to fabricate a printed flexible circuit. The laser ablation method includes using an appropriate laser to irradiate a metal sheet thus ablating the edges of an intended circuitry pattern. Slugs can be removed by using an optional sacrificial liner, and the slugs can be optionally ablated into smaller parts first. The laser ablation can also include an optional method of creating tie bars to provide structural support to the web of circuitry patterns.

A reel-to-reel machine to fabricate a printed flexible circuit on the fly, the machine has a plurality of reels, a laser scanner to ablate a metal foil, a source of UV light or heat to curing an adhesive in a coverlay, another source of UV light or heat to debond a sacrificial liner on the fly. There is a depositor to deposit a sintering paste on the fly onto a predetermined spot for a pad on the metal foil. Removal of slugs are also possible on the fly.

A reel-to-reel method of creating pads on a layer of metal sheet or circuitry pattern on the fly. The method includes placing a sintering paste in the intended spots for pads followed by irradiation of the sintering paste by a laser.

A reel-to-reel lamination method to laminate a metal foil or circuitry pattern on the fly. The method includes applying a UV laminate or thermoset laminate to the metal foil or the circuitry pattern reel to reel, and then apply a UV radiation or heat to the laminate. There can be an optional enclosure connected to a suction source. The enclosure can have a flexible bladder that physically compresses the laminate.

A method of layering a layer of circuitry pattern to another layer of circuitry pattern during the manufacturing of a multilayer flexible printed circuit in a reel-to-reel machine. The method includes feeding both layers of circuitry pattern reel-to-reel into the machine, placing a layer of dielectric sheet material on the fly between the two layers of circuitry patterns reel-to-reel, followed by simultaneously passing the two layers of circuitry pattern and the dielectric sheet material under a laser scanner in the reel-to-reel machine to irradiate a laser beam on a layer of circuitry pattern to weld the two layers of circuitry patterns together.

The electronic circuit device according to the present invention including the wiring layer 13 including a plurality of the metal wirings, the photosensitive resin layer 21 made of the photosensitive resin arranged on the wiring layer 13, and the first electronic circuit element 33 arranged in the photosensitive resin layer 21. In this electronic circuit device, a plurality of opening 41 for exposing a part of the wiring layer 13 is formed on the photosensitive resin layer 21, and further, together with three-dimensionally connected to the first electronic circuit element 33, the re-distribution layer 42 on the first electronic circuit element including a plurality of the metal wirings which is three-dimensionally connected via a plurality of openings to a part of the wiring layer 13, and the first external connection terminal 51 connected to the re-distribution layer 42 are formed.

A component carrier includes a stack having at least one electrically conductive layer structure and/or at least one electrically insulating layer structure, at least one first electrically conductive track extending from a vertical level defined by one of the layer structures up to a first height, at least one second electrically conductive track extending from the vertical level defined by the one of the layer structures up to a second height being larger than the first height, and at least one further electrically insulating layer structure in which the at least one first electrically conductive track and the at least one second electrically conductive track are embedded.