Apparatus for pulling crystals from molten compounds

Claim 1

FURNACE APPARATUS FOR PULING A SEMICONDUCTOR CRYSTAL FROM A MELT OF A MULTICOMPONENT MATERIAL HAVING A MORE VOLATILE COMPONENT AND A LESS VOLATILE COMPONENT, IN AN ATMOSPHERE OF THE MORE VOLATILE COMPONENT, COMPRISING A SEALED QUARTZ VESSEL FOR CONFINING SAID ATMOSPHERE, A CURCIBLE FOR THE MATERIAL STATIONED IN SAID VESSEL, SAID CURCIBLE HAVING AN OPENEING, A CRYSTAL-PULLING PISTON IN SAID VESSEL AND DISPLACED RELATIVE TO SAID CURICBLE OPENING, SAID PISTON BEING CONSTRAINED TO SUBSTANTIALLY STRAIGHT LINE CRYSTAL PULLING DISPLACEMENT, CURCIBLE HEATING MEANS SITUATED EXTERNALLY OF SAID VESSEL, A STRUCTURE PROVIDING A MAGNETIC FIELD, A QUARTZ ENCASE MAGNET ARMATURE STRUCTURE IN SAID VESSEL AND OPERATIVELY CONNECTED TO SAID PISTON, THE STRUCTURE PROVIDING A MAGNETIC FIELD BEING LOCATED EXTERNALLY OF SAID VESSEL, MEANS FOR CONTROLLED GRADUAL DISPLACEMENT OF THE VESSEL AND THE STRUCTURE PROVIDING A MAGNETIC FIELD RELATIVE TO EACH OTHER FOR FIG01 TRANSMITTING RELLATIVE PULLING DISPLACEMENT BETWEEN SAID PISTON AND CRUDIBLE, THE WALLS OF THE QUARTZ VESSEL HAVING NO MECHANICAL OR ELECTRICAL ELEMENTS PASSING THERETHROUGH.