Electric heating – Metal heating – By arc
Patent
1985-01-03
1986-11-18
Paschall, M. H.
Electric heating
Metal heating
By arc
219121LQ, 219121LR, 219121LP, 350172, 350629, B23K 2600
Patent
active
046237763
ABSTRACT:
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.
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Laser Machining and Welding, N. Rykalin, et al., MIR Publishers, Moscow, USSR, Appendix 4, pp. 292-294 (in English).
Buchroeder Richard A.
Palmer Eric M.
Sukhman Yefim P.
Dow Corning Corporation
Paschall M. H.
Rakoczy Richard E.
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