Abstract:
An adhesive interconnecting means (10) is comprised of one or more conductors (24) on an insulating substrate (20), a first adhesive layer (12), said first layer (12) being an anisotropically conductive adhesive (14) which is disposed over said conductors (24) and substrate (20) and a second adhesive layer (16) said second layer (16) being a flowable adhesive that extends over the anisotropically conductive adhesive layer (12). Upon positioning the first substrate conductors (24) in an overlapping conducting relationship to the second substrate (22) conductors (24) and applying pressure to the positioned areas, the second adhesive layer (16) flows from the positioned areas and exposes the anisotropically conductive layer to electrically interconnect the corresponding conductors accompanied by the adhesion of the remaining surface of the first substrate (10) to the surface of the second substrate (22). A method for interconnecting at least one conductive path means of a first insulating member with at least one conductive means on a second insulating member is also disclosed.
Abstract:
A boat (10) onto which solder balls (16) or columns are loaded for an attach process can be used in a universal attach line has a number of attach stations (32-44) to accommodate different types of attach processes. Depending on the process and the desired configuration and form factor of the array of solder balls (16) or columns, a template (14a, 14b) is selected that covers some of the holes (12) in the universal boat (10), and exposes other holes (12). The holes (12) are configured and sized to hold solder balls (16) in the holes (12) such that the solder balls (16) protrude above the top surface of the boat (10) by a predetermined height. This prevents damage to the solder balls (16) while ensuring that the solder balls (16) protrude enough to accommodate imperfectly flat packages that are placed on the array of solder balls (16) held in the boat (10). Vacuum applied through the holes (12) help to securely hold the balls (16) in place, and a substrate (18) is placed onto the solder balls (16). Once loaded with balls (16) or columns, the boat (10) is transported to only the appropriate attach stations in the universal attach line, where the different attach operations for a given attach process, such as high temperature ball attach, eutectic ball attach, or column attach, are performed. Also provided is a method of fabricating laminate assemblies that determines the ideal weight (W) of underfill to be dispensed, based on the size of the semiconductor die (144) and the gap (142) between the die (144) and the laminate substrate. Underfill (150) is dispensed in a single step in an amount between 1.1W and 1.3W to form fillets (52, 54) that cover at least 15% of the height of the semiconductor die (144) on all four sides of the die. The amount of underfill (150) ensures that the fillet coverage imbalance is 30% or less for each of the pairs of opposing sides of the die (144), thereby improving solder joint reliability.
Abstract:
The present invention provides a method for providing an array of metal microbeads on a substrate, preferably in a regular pattern of very fine, uniform size microspheres or microbeads at precise spacing or scale previously unachievable. The method of the present invention comprises the steps of providing a metal layer (14) on a substrate (12) that is partitioned into metal regions (20); heating the metal layer to a temperature sufficient to melt the metal and to permit beading of the layer into discrete microbeads (22).
Abstract:
본 발명의 목적은 경시 안정성이 우수하고, 열 압착에 의한 접합을 간편하면서 또한 높은 접합 강도로 실시할 수 있는 미세 구조체의 제공이다. 본 발명의 미세 구조체는 1×10 6 ∼ 1×10 10 /㎟ 의 밀도이며, 구멍 직경 10 ∼ 500 nm 의 마이크로포어 관통공을 갖는 절연성 기재로 이루어지는 미세 구조체로서, 그 마이크로포어 관통공 내부에, 충전율 30 % 이상으로 금속이 충전되고, 또한, 그 절연성 기재의 적어도 일방의 표면 상에 폴리머로 이루어지는 층이 형성되어 있는 것을 특징으로 하는 미세 구조체이다.
Abstract:
An example stretchable device is described that includes electrical contacts and an interconnect coupling the electrical contacts. The interconnect has a meander-shaped configuration that includes at least one nested serpentine-shaped feature. The interconnect can be conductive or non-conductive. The meander-shaped configuration can be a serpentine structure, providing a serpentine-in-serpentine configuration.
Abstract:
Disclosed is an anisotropic conductive adhesive (10) having an adhesive layer (12) and conductive particles (16) individually adhered to the adhesive layer, the conductive particles being arranged in an ordered array. The size of the conductive particles is at least somewhat smaller than the thickness of the adhesive layer. Also disclosed is an anisotropic conductive adhesive having an adhesive layer, conductive particles individually adhered to the adhesive layer, and a release liner (28) having an ordered array of dimples (24). The conductive particles reside in a single layer in the dimples. The anisotropic conductive adhesive is made by placing the conductive particles in an ordered array of dimples on a low adhesion surface. An adhesive layer is then laminated on top such that the conductive particles individually adhere to the adhesive layer. The anisotropic conductive adhesive may be used to electrically connect fine pitch electrodes on opposing circuit layers.