Echelle pliante.

Ustensile muni d'un support.

Procédé pour récupérer la chaleur des gaz et des fumées sortant du foyer d'un appareil de chauffage, et installation pour la mise en oeuvre de ce procédé.

Automatic multilayer ceramic (MLC) screening machine

Vertically displaceable green sheet support fixtures are borne by respective horizontally movable carriages traveling on common rails between respective dual loading stations and a common unloading station, through separate intermediate screening stations, with the carriages movable in opposite directions and out of phase stationwise. The carriages have fixedly coupled thereto, horizontally movable trailers which bear trays of stacked green sheets for selective transfer of the uppermost green sheet to a loading head at the loading station while the carriage borne fixture itself is at a screening station for paste screening of a prior transferred green sheet. Masks employed in screen printing at the screening station are removed from the screening station console and placed in a cleaning chamber for solvent removal of residual screening paste and are air dried prior to return to the screening station console. During cleaning of a dirty mask, a second clean mask is automatically presented at the station to eliminate throughput-loss. The fixture is vertically displaceable on the carriage and its height incrementally varied depending upon green sheet thickness variation. Accelerated vertical separation of the carriage borne green sheet from the mask is effected subsequent to initial slow incremental separation therebetween.

Method and apparatus for locating and aligning flimsy sheets

A method and apparatus permitting accurate and repeatable steps of location and alignment of flimsy sheets during their transfer. A preferred embodiment comprises a sheet handler and method for aligning unfired ceramic green sheets used in multi-layer ceramic semiconductor packages. The thin flexible sheets are square or rectangular in shape and are provided with holes accurately punched in each corner thereof for alignment purposes. The sheets are moved by a vacuum input transfer head into orientation with a porous registration surface of an alignment fixture. The sheet is then trapped between opposed pressure zones emanating from the input transfer head and through the porous registration surface, respectively. With the sheet stabilized between the pressure zones four bullet-nosed alignment pins are raised from the registration surface into contact with the holes in the corners of the green sheet, thereby accurately aligning the sheet with respect to the alignment fixture. The input transfer head is then withdrawn and an output transfer head picks up the aligned sheet via vacuum means and transfers it to other processing locations. In an alternate embodiment the pressure zones are created between the output transfer head and the registration surface of the alignment fixture.

Holding device for semiconductor chips and method for connecting the holding device to the semiconductor chip

Wafer mounting

WAFERS ARE BONDED TO A CARRIER SURFACE WHICH TENDS TO BULGE IN REACTION TO THE BONDING PROCESS, PARTICULARLY HEATING, BUT TO RETURN TO A FLAT CONFIGURATION AFTER BOND CURING. VOID-FREE BONDING IS OBTAINED BY SHAPING THE BONDING MATERIAL TO THE CARRIER BULGE AND INTRODUCING THE WAFER TO THE HIGH POINT OF THE BULGE RELATIVE TO THE FLAT SURFACE OF THE CARRIER. CLOSURE PRESSURE BETWEEN WAFER AND CARRIER AND THE REACTION OF THE CARRIER IN COOLING TO A SUBSTANTIALLY FLAT SURFACE CONFIGURATION COPERATE TO COMPLETE THE BONDING.

Workpiece rack unloader apparatus

Green sheet support fixture speed and position control system for a screening machine

Contact pin inserter

Diskette drive front panel for a personal computer

Component with standoff and method of making same

Vacuum pick-up head for smooth, flimsy workpieces