B - Operations – Transporting – 24 – B
Patent
B - Operations, Transporting
24
B
B24B 13/005 (2006.01)
Patent
CA 2241426
A method is provided for producing an ocular lens. The method includes the steps of preparing a lens blank which gives an ocular lens, the lens blank having a concave back surface and a convex front surface, at least a portion of the front convex surface being tapered or frusto-conical. A back curved surface of the ocular lens is formed by effecting a cutting operation on the concave back surface of the lens blank, while the lens blank is supported on a spindle of a back surface cutting device such that the tapered or frusto-conical portion of the lens blank is drawn onto a tapered holding surface of the spindle under a negative pressure which is applied to the lens blank, the tapered holding surface following a profile of the tapered or frusto-conical portion of the lens blank. A front curved surface of the ocular lens is formed by effecting a cutting operation on the front convex surface of the lens blank whose back concave surface has been cut to form the back curved surface, while the lens blank is supported on a spindle of a front surface cutting device such that the back curved surface of the lens blank is drawn onto a holding surface of the spindle of the front surface cutting device under a negative pressure which is applied to the lens blank.
Ichikawa Seiichi
Miura Toshikazu
Sasaki Masahiro
Tajima Hiroyuki
Tanaka Yuki
Borden Ladner Gervais Llp
Menicon Co. Ltd.
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