GLASS PLATE MANUFACTURING METHOD

• Main Authors: KUROIWA YUTAKA, IGA MOTOICHI
• Format: Patent
• Language: English; Korean
• Published: 30.07.2010
• Subjects: CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; MACHINE TOOLS; MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; MINERAL OR SLAG WOOL; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PERFORMING OPERATIONS; PHYSICS; SOLDERING OR UNSOLDERING; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TRANSPORTING; WELDING; WORKING BY LASER BEAM

A glass plate manufacturing method for manufacturing a glass plate for display substrates, especially a glass plate for flat panel display substrates, or a glass plate for photomasks, free of bubbles which are a problem when the glass plate is used without causing any local bulge on the surface of the glass plate and any local residual stress and birefringence within the glass plate when a laser beam is projected to the glass plate. The method is characterized in that bubbles are reduced or extinguished by applying to the bubbles in a glass plate (or a glass ribbon at its glass plate manufacturing process) a laser beam with a wavelength to which the absorptance of the glass plate (or the glass ribbon) is 30% or more at a temperature at which the viscosity of the glass lies in the range from 10to 10dPa s.