초록 ▼

This invention provides a simplified laser optics system for generating a ring-shaped beam of laser radiation which is used for contouring and severing a curved, particularly a dome-shaped, article such as a silicone elastomer contact lens from a workpiece. The laser optics system consists essential

This invention provides a simplified laser optics system for generating a ring-shaped beam of laser radiation which is used for contouring and severing a curved, particularly a dome-shaped, article such as a silicone elastomer contact lens from a workpiece. The laser optics system consists essentially of a focussing element having a convex surface which receives a circular beam of laser radiation and an opposed conical surface forming an axicon which element transforms the circular beam into a ring-shaped beam of laser radiation. The ring-shaped beam is received by a reflective element having a conical reflective surface which causes the beam to impinge upon the curved workpiece surface, preferably at an angle which is substantially perpendicular to the workpiece surface, to accomplish edge contouring and severing of the article from the workpiece.

대표청구항 ▼

A laser optics system for generating a ring-shaped beam of electromagnetic radiation for use in contouring and severing a lens-shaped article article having a curved surface from a workpiece, said system consisting essentially of A. a focussing element for receiving a circular beam of electromagneti

A laser optics system for generating a ring-shaped beam of electromagnetic radiation for use in contouring and severing a lens-shaped article article having a curved surface from a workpiece, said system consisting essentially of A. a focussing element for receiving a circular beam of electromagnetic radiation from an appropriate laser source and transforming said beam into a ring-shaped beam of electromagnetic radiation, said element having two opposed surfaces wherein one of said surfaces is a convex lens surface and the opposite surface is a conical surface which forms an axicon, said element being situated in the path of and concentric with the central long axis of said circular beam such that the circular beam enters the convex surface and the ring-shaped beam concentric with said circular beam emerging from the axicon surface is received by B. a reflective element having a conical reflective surface situated at such an angle and situated in such a position relative to the central long axis of said ring-shaped beam to cause a ring-shaped beam of a preselected diameter to impinge upon a curved workpiece surface located beyond the focussing element and reflective element at a preselected angle with respect to the curved surface of the workpiece.