Apparatus for imparting translational and rotational motion

Abstract

Abstract A PULLING HEAD WHICH IS CAPABLE OF IMPARTING BOTH TRANSLATIONAL AND ROTATIONAL MOTION TO A BODY. THE PULLING HEAD IS RUGGED, CAPABLE OF RETAINING ITS ALIGNMENT AND IS PARTICULARLY WELL SUITED FOR USE WITH CRYSTAL GROWING FURANCES WHERE THE MOVING PULLING HEAD ROD MUST EXTEND INTO ATMOSPHERES IN WHICH THE PRESSURE AND/OR TEMPERATURE DIFFERS MATERIALLY FROM THE AMBIENT ATMOSPHERE. THE GREATLY INCREASED ACTIVITY IN THE GROWING SYNTHETIC CRYSTALS FROM A MELT AND THE REFINING OF CRYSTALLINE MATERIALS BY THE SO-CALLED ZONE REFINING PROCESS HAVE BROUGHT ABOUT THE DEMAND FOR IMPROVED MECHANISMS FOR ACCOMPLISHING THESE OPERATIONS. THUS, FOR EXAMPLE, THERE HAS DEVELOPED IN RECENT YEARS A GREAT BODY OF ART IN THE GROWING OF MATERIALS FOR SEMICONSUCTORS AS WELL AS CRYSTALS FOR LASERS. THERE ARE A NUMBER OF TECHNIQUES AVAILABLE FOR GROWING THESE SYNTHETIC CRYSTALLINE AND INTERCRYSTALLINE MATERIALS. PRACTICALLY ALL OF THESE TECHNIQUES REQUIRE THAT EITHER THE GROWING CRYSTAL, THE MECHANISM FOR DELIVERING A MOLTEN MATERIAL TO BE CRYSTALLIZED, OR A PREFORMED ROD OF A MATERIAL BE MOVED DURING THE PROCESS. SUCH MOVEMENT MUST BE BOTH ROTATIONAL AND TRANSLATIONAL AND IT MUST BE ACCOMPLISHED AT PRECISE AND CONSTANT AXIAL AND ANGULAR VELOCITIES.

Inventors

• 👤 Paul R Doherty
• 👤 Thomas P Hosmer

Bibliographic Details