Ultrasonically welded hydrogel ophthalmic lens

摘要: First and second hydrogel lens members are configured to be ultrasonically welded one another. Both the first have an annular bonding surface. The member has energy director extending from its a generally rectangular cross section, height of 0.127 0.178 millimeter, extended smooth surface 0.381 millimeter width adapted engage member. is mated with member, pressure in range 55.1 68.9 KN/m2 applied thereto force together. Ultrasonic for weld time period 0.15 0.22 second. Following period, application ultrasonic discontinued hold 0.25 following period.