CIRCULAR GLASS SHEET AND PRODUCTION METHO THEREOF

• Main Authors: ODANI OSAMU, IKEMOTO MASAYUKI
• Format: Patent
• Language: English; Japanese
• Published: 02.11.2017
• 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; 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; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS; TRANSPORTING; WELDING; WORKING BY LASER BEAM

PROBLEM TO BE SOLVED: To improve strength by reducing fine flaws or micro-cracks at a notched part on an outer peripheral edge of a circular glass sheet.SOLUTION: In a production method of a circular glass sheet, the circular glass sheet is produced from an original circular glass sheet 1 having a notched part 2 and an un-notched part 3 where a notched part 2 is not formed, on an outer peripheral edge 4. The production method of the circular glass sheet has a processing step for heating the notched part 2 and the un-notched part 3 to above the softening point by scanning laser along the outer peripheral edge 4.SELECTED DRAWING: Figure 1 【課題】円形状のガラス板の外周縁の切り欠き部において、微小な傷やマイクロクラックを減少させることにより、強度を向上させる。【解決手段】本発明の円形状ガラス板の製造方法は、切り欠き部２と、切り欠き部２が形成されていない非切り欠き部３とを外周縁４に備えた円形状の元ガラス板１から円形状ガラス板を製造する。そして、本発明の円形状ガラス板の製造方法は、外周縁４に沿ってレーザを走査することにより、切り欠き部２及び非切り欠き部３を軟化点以上に加熱する加工工程を有する。【選択図】図１