International Business Machines Corporation

Richard H Kurth

Pedro A Chalco

Wesley LeRoy Hillman

Nicholas T Panousis

A combination of laser energy and ultrasonic energy is used for soldering an insulated wire to a pad located on a substrate. The combined laser energy and ultrasonic energy strips the insulation from the wire and solders the resulting bare wire to the pad. The method has particular use for soldering insulated wire to pads located on heat sensitive substrates or to pads located in close proximity to heat sensitive devices. A principal application is for soldering fine insulated wires for connecting a thin film magnetic head to a circuit carrier substrate.

Lasersonic soldering of fine insulated wires to heat-sensitive substrates

Nozzle plates for ink jet recording are produced by etching through silicon and like monocrystalline material wafers which frequently are non-uniform in thickness. The '100' plane surfaces of the wafers are coated with etchant masking material after which a nozzle array pattern is defined on the obverse surface and a similar, but larger and less exacting, aperture array of the same pattern is defined on the reverse surface. The silicon wafer as thus exposed is anisotropically etched from the reverse substantially through to the obverse and thereafter etched completely through the wafer from the obverse by the same anisotropic process. The lateral walls of the nozzles are substantially in the '111' plane of the wafers. The masking material is then stripped from the wafer.

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Palo Alto, CA, United States of America

Richard H Kurth