| 摘要 |
<p>PURPOSE:To produce the glass blank material having a desired shape without defects on its surface without etching and polishing stages at the time of producing the glass blank material for a blank material for reheat press of the glass blank material, such as lens or prism, having high accuracy. CONSTITUTION:A required amt. of fused glass is received on a receiving tray polished to a smooth surface with good accuracy. The receiving tray 2 receiving the fused glass gob is constituted of at least >=2 kinds of materials varying in the wettability with the glass 1. For example, the receiving tray 2 is formed as the receiving tray constituted of the material 2b having the good wettability with the imposed central part of the fused glass gob 1 and the material 2a having the poor wettability with the imposed outer peripheral part of the fused glass gob. The fused glass gob is cooled on the receiving tray 2, by which the glass blank material 1' is produced. As a result, the wrinkle-like surface defect of the surface of the glass blank material in contact with the receiving tray 2 is removed and the wetting area of the fused glass gob and the receiving tray is controlled and, therefore, the shape of the resulted glass blank material is extremely stabilized.</p> |
