GLASS FUSING METHOD AND DEVICE

摘要

The present invention provides a glass fusing method comprising the steps of preheating contacting or close portions of glass pieces to a temperature which is lower than a fusing temperature of the glass, then locally heating the portions to a temperature which is equal to or higher than the fusing temperature of the glass and fusing the portions after the preheating step, and annealing the fused portions to a temperature which is lower than the fusing temperature of the glass after the fusing step. The fusing method is carried out as follows, for example. More specifically, a laser beam is supplied from a laser oscillator (10) to a torch head (8), and the laser beam supplied from the torch head (8) is irradiated as irradiated light (80) on portions of glass plates (A) and (B) to be fused together. The torch head (8) circulates around peripheral edge portions of the glass plates (A) and (B) three times while changing a heating level of the irradiated light (80). Preheating, fusion and annealing are performed for first, second and third circulations, respectively.