Abstract:
A device for maskless thin film etching, including an ablation tool adapted to emit an ablative output for etching a surface, a gas jet associated with a source of carrier gas and adapted to emit a stream of the carrier gas at an area of the surface where the output of the ablation tool impinges, and a suction member associated with a vacuum source and adapted to collect ablated particulate from the area of the surface where the output of the ablation tool impinges, wherein the ablation tool, the gas jet, and the suction member are mounted adjacent one another.
Abstract:
A device for assembling an element on a surface of a substrate by providing a solder-forming mass. The device has a means for moving the element and a measurement means. The means for moving the element includes a support and an element gripper member. The gripper member has a vertical axis that is perpendicular to the surface of the substrate and is mounted to move freely in translation on the support in a direction parallel to its vertical axis. The measurement means measures a variation of the position of the element in vertical translation.
Abstract:
Provided are a solder ball bonding method and a solder ball bonding device for performing bonding of a plurality of electrode portions formed on objects to be bonded by melting solder balls. The solder balls are suctioned by using a plurality of suction nozzles that follow the electrode portions of the objects to be bonded, and conveyed onto the electrode portions. A laser irradiation portion that is positioned above the suction nozzles is then moved in a direction along which the suction nozzles are arranged, while the solder balls are irradiated with laser light passing through suction openings of the suction nozzles by using the laser irradiation portion. Accordingly, it is possible to melt the plurality of solder balls on the electrode portions by using only a single laser irradiation portion.
Abstract:
A photovoltaic cell comprising a supporting substrate, a front contact layer on the substrate, a layer or layers of semiconductor material and a back contact layer comprising a metal, the back contact having areas without metal thereby permitting the passage of light through the cell.
Abstract:
A method of manufacturing a plurality of multilayer electronic components, comprises the steps of: (a) Manufacturing a laminated sheet (1) in which layers of ceramic tape are each provided on one side with a pattern of electrodes; are stacked so that the electrode patterns on consecutive layers are offset back and forth with respect to one another, and are pressed together, cutting the laminated sheet into segments in which consecutive electrodes with a gas cooled laser beam, are alternately exposed at a different segment edge with a gas cooled laser beam; sintering the segments and providing electrical contacts which interconnect the electrodes exposed at given segment edges.
Abstract:
Disclosed is a method for the marking of particulars on a connector of a card called an electronic chip card, said connector having metal contacts with a given thickness. Said method comprises a step consisting of the etching, with a laser beam, of said particulars in the thickness of the metal contacts of the connector. Application to the marking of chip cards, bank cards, telephone cards etc.
Abstract:
A method for soldering a ceramic body of an electric component, such as a microwave resonator, into a metal housing, includes applying a tin layer over the ceramic body provided with an electrically conductive layer. A high-melting-point lead-tin passivation layer is applied to a surface of the housing to be soldered to the ceramic body.
Abstract:
Inspection of solder joints utilizing ilumination, reflected light intensity measurements to determine surface heights and comparison with predetermined inspection criteria to determine the integrity of the solder joint. A solder fillet (16b) is sequentially illuminated from first and second angles and optically scanned and reflected light intensity values at incremental values of inclination are measured. The heights of the fillet wall (16d) at predetermined points and the integrity of the fillet (16b) are determined using the measured reflected light intensity values and either using real-time computation or accessing an array of predetermined incremental inclination values as a function of the reflected light intensity values. Alternatively, the ratio of the sensed reflected light intensity values at each point may be used as an input variable to a one dimensional look-up table or for real-time computation. The solder fillet may be coated with a matte coating.
Abstract:
An improved solder/polymer fluxless composite paste interconnection material having a low reflow temperature to form electrical contacts having good bonding strength and low contact resistance. The present pastes comprise a major proportion of a meltable metal alloy powder filler, free of noble metals and preferably free of lead, a minor proportion of a solution of a temperature-stable thermoplastic polymer having a softening temperature above the melting temperature of the metal powder filler in a volatile solvent which evaporates during reflow, and a minor proportion of a fluxing agent having a boiling point lower than the reflow temperature of the composition and higher than the melting point of the eutectic alloy powder filler. An oxide-free, partially coalesced metal alloy connection is obtained, which is polymer strengthened and reworkable at a low reflow temperature, per se, or in the presence of polymer solvent.
Abstract:
A method for laser welding a first and an at least partially overlapping second workpiece sheet along a machining path includes: detecting a distance from a reference to the first and to the second sheet at a plurality of positions; determining a gap width between the sheets based on the distances; and welding together the sheets by radiating the beam along the path and forming a weld seam. The laser beam power is adapted to the respective gap width along the path. A laser machining system for welding sheets using a machining laser beam includes: a distance measuring device detecting a distance to a first and second sheet at a plurality of positions; deflection optics guiding the beam along a machining path; and a control device determining a gap width between the sheets based on the distances. The control device adapts the laser beam power to the respective gap width.