| abstract |
A QUARTZ CRYSTAL TUBE, OBTAINED BY MECHANICALLY PROCESSING A NATURAL / SYNTHETIC QUARTZ CRYSTAL STOCK MATERIAL, WHICH HAS 50 300 MM DIAMETER IN EXTERNAL DIAMETER, FROM 1''1 TO 7 IN PROPORTION OF EXTERNAL TO INTERIOR DIAMETERS, 10 MM OR MORE THICKNESS AND 2% OR LESS THICKNESS ERROR; A LARGE-SCALE QUARTZ GLASS PREFORMED COMPOUND, INTEGRALLY COMBINING THE LARGE-SCALE QUARTZ CRYSTAL TUBE, WITH A CORE CRYSTAL ROD FOR AN OPTICAL FIBER, USING A TUBE ROD TECHNIQUE; AND A METHOD FOR MANUFACTURING A PREFORMED LARGE-SCALE QUARTZ CRYSTAL COMPOUND, PERFORMING THE MANUFACTURING PROCESS WITH A HIGH-PRECISION MACHINE, THAT IS, INTEGRATING A NUCLEUS ROD FOR AN OPTICAL FIBER, WITH A TUBE IN PROCESS QUARTZ CRYSTAL, A PIPE DIAMETER WHICH IS CONTROLLED BY HEATING, HOT STRETCH, OR HOT PRESSURE STRETCH, USING A TOOL-FREE STRETCH METHOD. |