| 摘要 |
A method for forming an optical element having a rotationally asymmetric optically functional surface from an optical block comprises the steps of putting a polygonal optical block chamfered at respective corners in a cavity formed between upper and lower moulds, advancing the upper and lower moulds to each other so as to bring a rotationally asymmetric transfer surface of the mold into contact with a center of the block, and pressing the block between the upper and lower moulds from the center toward a periphery of the block so as thereby to transfer the rotationally asymmetric transfer surface to the block.
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