| 摘要 |
A quartz glass plate large in size, high in purity, smooth at surface, and excellent in planeness and a method and a device for making said plate by cutting and unfolding a quartz glass tube, which is characterized in that, as shown in Figs. 1 and 2, a quartz glass tube (1) slotted along the axial direction thereof and preferably having a band-like slot part (1a) is turned into a plate through a process in which the glass tube (1) is stretched, beginning at a specified band-like part, in the direction roughly tangential to the circumference thereof while subjected to heating and softening at one band-like part after another each extending across the entire width of the tube in the axial direction and arranged in the circumferential direction of the tube starting at said specified part. <IMAGE> |
