| 摘要 |
A method is provided for manufacturing a conical-shaped cover device from a transparent, thermally deformable sheet material. The method includes supporting the sheet material about a peripheral base portion of the conical-shaped cover device to be formed. The base portion substantially encloses an interior region thereof. This region is heated to a deformable condition that enables deformability thereof. At least one of a central portion of the interior region and the base portion of the conical shaped device is urged in a direction opposite one another, generally along the longitudinal axis of the conical-shaped cover device. A non-contacted conical intermediate portion of the conical shaped cover, between the central portion and the base portion, is formed in a manner that substantially preserves the optical and/or surface finish properties of the sheet material without the need for secondary processing thereof.
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