Abstract:
When drilling a multi layered sheet-like material, drilling is first made with pulses having energy that generates an inter-layer pull-off force smaller than the adhesion force between the layers. Then pulses with higher energy are radiated for trimming the shape of the holes, and thus through-holes having a desired shape are drilled without causing delamination of the layers.
Abstract:
An interposition structure interposed between substrates and capable of guiding the insertion of a connection pin for electrically connecting the substrates to each other, whereby the connection pin can be inserted properly even in cases where the substrates to be connected or other members have a dimensional error caused during production thereof, a positioning error or the like. The interposition structure has an interposition body in which a through hole is formed such that connection pin inlet and outlet portions thereof each have an inner diameter gradually increasing in a direction from the inner part to the corresponding outer open end thereof, and also has a positioning protuberance provided on the underside of the interposition body. The interposition structure is interposed between upper and lower substrates with the positioning protuberance received in a recess formed in the upper surface of the lower substrate, and the connection pin is inserted through a hole in the upper substrate, the through hole, and a hole in the lower substrate.
Abstract:
A method of making a microelectronic component by providing a conductive element, providing a resist at selected locations on said conductive element and electrophoretically depositing an uncured dielectric material on the conductive element, wherein the uncured material will be deposited on the conductive element except at locations covered by the resist. The deposited material is cured to form a dielectric layer and the resist is removed so that the dielectric layer has openings extending to the conductive element at locations the locations which were covered by the resist.
Abstract:
A wiring board is machined by providing a light shielding body for shielding a portion of a laser beam in a light path between a laser oscillator and a machining lens, irradiating the laser beam onto the light shielding body, and introducing a non-shielded portion of the laser beam having passed through the light shielding body to the machining lens.
Abstract:
There is provided a semiconductor plastic package in the form in which at least one semiconductor chip is mounted on a small-sized printed wiring board, a metal plate for the above package and a method of producing a copper-clad board for the above package. More particularly, there is provided a semiconductor plastic package suitable for relatively high-watt, multi-terminal and high-density semiconductor plastic packages such as a microprocessor, a micro-controller, ASIC and graphic, and a method of producing the same.
Abstract:
A via structure is obtained by etching a through-hole in a substrate on the via location and placing transmission lines on declining or sloping sidewalls of the hole. The lines continue to conductors on the other surface of the substrate through vias located in a free portion of a thin film structure at the bottom side of the substrate. The free portion is so strong and large, that several vias can be made therein for connection to a plurality of parallel lines forming e.g. a bus structure. The large free portion can be additionally supported by a thick support layer applied on top of the layers in the hole. By applying an isolated ground plane and a dielectric layer between the substrate and the transmission lines, the transmission lines on the sloping sidewalls of the via hole structure can be made impedance matched. The sloping sidewalls of the via hole can easily be obtained using a V-groove etch for a monocrystalline Si-substrate. The via structure obtained is especially well suited for data transmission buses, which do not need to reduce their transmission line density through the via structure.
Abstract:
Printed circuit substrates and electrical assemblies including a conductive composition are disclosed. The printed circuit substrate and the electrical assembly embodiments comprise a first conducting region and a second conducting region. A dielectric layer is disposed between the first and second conducting regions. An aperture is disposed in the dielectric layer and a via structure including the conductive composition is disposed in the aperture. The conductive composition is preferably in a cured state and electrically communicates with the first and second conducting regions. In preferred embodiments, the conductive composition comprises conductive particles in an amount of at least about 75 wt. % based on the weight of the composition. At least 50% by weight of the conductive particles have melting points of less than about 400.degree. C. The composition further includes a carrier including an epoxy-functional resin in an amount of at least about 50 wt. % based on the weight of the carrier, and a fluxing agent in an amount of at least about 0.1 wt % based on the weight of the carrier. The epoxy functional resin can have a viscosity of less than about 1000 centipoise at 25.degree. C.
Abstract:
Method for the manufacture of micro solder bumps, in which holes are structured by means of laser ablation in a mask, in order to produce solder bumps higher than the mask thickness. Through the additional use of a wobble plate in the production of trough-like stepped holes, micro solder bumps with an even larger volume can be produced.
Abstract:
An electronic device assembly includes a rigid, first substrate and a second substrate. The first substrate has a first pad on the upper surface, and a through-hole at a position of the first pad. The second substrate has a second pad on the upper surface thereof. The first and second pads are connected via solder. At least a part of the solder is positioned in the through-hole of the first substrate. The first substrate may include a flexible substrate and a rigid plate. The through-hole is provided in the flexible substrate. The first pad is provided on the lower surface of the flexible substrate. The rigid plate is attached to the flexible substrate. The plate has a hole at a position of the through-hole to make the first pad reachable.
Abstract:
A method for the manufacture of electrically conductive lead-throughs for metallized plastic housings. Elevations around the lead-through holes in the housing part are formed at the time of making the housing part (e.g. by injection molding). The entire surface of the housing part is then metallized and the metallization on the elevations around the lead-through holes is removed by mechanical processes that act in one plane and where the lower metallization areas remain unaffected on account of the difference in level. Finally, the metal pins are attached in the lead-through holes by soldering or glueing.