Abstract:
A wiring substrate with reduced thermal expansion stress. A wiring substrate, such as a laminated PWB, thin film circuit, lead frame, or chip carrier accepts an integrated circuit, such as a die, a flip chip, or ball grid array package. The wiring substrate has a thermal expansion stress reduction insert, void, or constructive void in a thermal expansion stress region proximate to the integrated circuit. The thermal expansion stress reduction insert or void may extend a selected distance from the edge or edges of the integrated circuit attachment area. The thermal expansion stress reduction insert or void improves the flexibility of the wiring substrate in the region that is joined to the integrated circuit, thus reducing thermal stress between components of the wiring substrate-integrated circuit assembly. In another embodiment, layers of a laminated wiring substrate are intentionally not bonded beneath the chip attach area, thus allowing greater flexibility of the upper layer of the laminate.
Abstract:
Leiterplatte umfassend, einen Schaltungsträger (1), eine Deckschicht aus einem nicht leitenden Material (4), welches eine organische Substanz umfasst, angeordnet auf dem Schaltungsträger (1), eine erste Metallisierungsebene (5) zumindest teilweise angeordnet auf der Deckschicht (4), wobei die erste Metallisierungsebene (5) einen flexiblen Bereich (10) aufweist.
Abstract:
A wiring board has a substrate (1) having a groove (2) on its surface, a first wiring (3) placed in the groove, a plurality of bonding members (5) located at mutually separated positions and each of which bonds the first wiring and the substrate. A gap (4) is located between the first wiring and the surface of the groove.
Abstract:
The invention relates to a method for producing a moulded component (2A-2G) comprising an integrated conductor strip (10), wherein a conductor strip (10) is produced on a carrier component (4) particularly by flame injection or cold gas injection. The surface of the carrier component (4) is treated in a selective manner corresponding to a predetermined path of the conductor strip (10) so that the surface areas thereof have different adhesions. A germ layer is applied to the path of the conductor strip (10), whereupon the conductor strip (10) is subsequently placed thereon. It is therefore possible to produce a moulded component (2A-2G) comprising an integrated conductive strip mould in a very flexible and economical manner. In automobile industries, special requests from the clients can be met in a fast and efficient manner by altering the layout of the conductor strip.
Abstract:
A relatively thin expansion layer (18) is provided on top of the conventional printed wiring board (20). This expansion layer (18) is bonded to the printed wiring board (20) except at locations (40) underneath the footprint of the chip carrier (13) and solder joints (42). This expansion layer (18) provides forgivable expansion between the ceramic leadless chip carrier (13) and the printed wiring board (20) due to thermal expansion mismatch, to thereby reduce cracking of the solder joint (42). In an alternative embodiment, prevention of bonding underneath the chip carrier footprint is provided by a thin layer of polytetrafluoroethylene (PTFE) (39). Methods for applying the PTFE layer are disclosed.
Abstract:
There is a demand for a multilayer flexible printed circuit board (multilayer FPC) which includes surface interconnection layers each having a minute circuit configuration and permits higher density mounting. A first double-sided FPC (3) and a second double-sided FPC (4) are laminated via a bonding sheet (2). The bonding sheet (2) has a hole preliminarily formed therein and filled with an electrically conductive paste (11), and the first double-sided FPC (3) and the second double-sided FPC (4) are electrically connected to each other via the electrically conductive paste (11). The first double-sided FPC (3) and the second double-sided FPC (4) are respectively formed with inner layer via-holes (16) and (24), which do not reduce the size of component mounting areas on a first interconnection layer (L1) and a fourth interconnection layer (L2) (outer surface interconnection layers) of the first double-sided FPC (3) and the second double-sided FPC (4).
Abstract:
The invention relates to an undetachable electrical and mechanical connection (4) between a contact element (7) having contacts (31) and a counter-contact element (8) having counter-contacts (27) with a flexible section (39) of the contact element (7) in at least a part of the contacts (31). The invention is further characterized in that the contact element (7) has at least one first and second layer (21, 22) that define an intermediate space (23) between them in the zone of the flexible section (39) in which intermediate space the counter-contact element (8) is disposed. The first and the second layer (21, 22) is provided with one contact (31) each on the layer inner sides (40) facing one another. The counter-contact element (8) has at least one counter-contact (27) on each of its upper and lower side (25, 26).
Abstract:
A wiring substrate with reduced thermal expansion. A wiring substrate, such as a laminated PWB, thin film circuit, lead frame, or chip carrier accepts an integrated circuit, such as a die, a flip chip, or a BGA package. The wiring substrate has a thermal expansion reduction insert in a thermal expansion stress region where the integrated circuit is mounted. The thermal expansion reduction insert may extend a selected distance from the edge or edges of the integrated circuit attachment area, or stop a selected distance from the edge or edges of the integrated circuit attachment area, or be essentially equal to the integrated circuit attachment area. The thermal expansion reduction insert reduces the thermal (LMF) expansion of the wiring substrate in the region that is joined to the integrated circuit, thus reducing thermal stress between components of the wiring substrate-integrated circuit assembly. In a specific embodiment, the wiring substrate is a laminated printed wiring board with the thermal expansion reduction insert in a layer next to an outer layer to which the integrated circuit is joined (mounted). In a further embodiment the thermal stress reduction insert is a CIC insert or a copper-molybdenum insert. In an alternative embodiment, the wiring substrate is a thin film substrate or a VLSI substrate.