| 摘要 |
Production of a SiO2 blank comprises forming SiO2 particles in a burner flame, and depositing the particles onto the bearing surface of a support rotating about its longitudinal axis under the action of an electrical field. The burner moves backwards and forwards along the blank formed between turning points. The geometrical shape of the burner flame is changed independent of the position of the burner during movement through the electrical field. An Independent claim is also included for a device for producing a SiO2 blank comprising a burner (2), a drive to move the burner along the support, and a pair of electrodes (4a, 4b) connected to a voltage source (3) for producing the electrical field. Preferred Features: The width of the burner flame in the direction of the longitudinal axis of the support is changed depending on the position of the burner during movement.
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