Apparatus for producing glass base material, and method for producing glass base material
AssigneeSumitomo Electric Industries, Ltd.
InventorsShinobu Hata, Yusuke Kubo
Life of this patent
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Abstract
An apparatus for producing a glass preform is an apparatus by pulling up a starting rod while the starting rod is rotated around an axis and glass fine particles generated by a burner are deposited in an axial direction of the starting rod. The apparatus for producing a glass preform includes an imaging device that acquires a deposition surface image by imaging a deposition surface of a glass fine particle deposit deposited on the starting rod, and an image processing unit that detects an edge shape of the deposition surface from the deposition surface image acquired using the imaging device to judge quality of the glass fine particle deposit by quantifying a degree of deformation of the edge shape.
Claims6
A method for producing a glass preform, the method comprising:
- producing a glass fine particle deposit on a starting rod by pulling up a starting rod while the starting rod is rotated around an axis and glass particles generated by a burner are deposited in an axial direction of the starting rod;
- acquiring a deposition surface image by imaging a deposition surface of the glass fine particle deposit deposited on the starting rod;
- detecting an edge shape of the deposition surface from the deposition surface image;
- determining a quality of the glass fine particle deposit by quantifying a degree of deformation of the detected edge shape and classifying the degree of deformation of the edge shape by kind of deformation;
- and
- changing a production condition for the glass fine particle deposit based on the kind of deformation quantified in the determining a quality step,
- wherein the change to the production condition comprises:
- adjusting a tip shape of the deposition surface by moving the burner in Y-axis and X-axis directions using a stage;
- adjusting a rotationally asymmetrical shape of a tip of the deposition surface by adjusting a Y-axis of the burner using a stage;
- or
- adjusting a shape of a side surface of the deposition surface by controlling a gas flow rate of a core burner, and
- wherein in the acquiring a deposition surface image step, the deposition surface image is acquired through an optical filter having light transmission characteristics which pass through light having any wavelength range within a wavelength range of 350 nm to 510 nm.
Dependencies are inferred from the claim text.