Ultrasonically welded hydrogel ophthalmic lens
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United States of America Patent
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-
Aug 4, 1992
Grant Date -
N/A
app pub date -
Dec 27, 1989
filing date -
Dec 27, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
First and second hydrogel lens members are configured to be ultrasonically welded to one another. Both the first and second lens members have an annular bonding surface. The second lens member has an energy director extending from its bonding surface. The energy director has a generally rectangular cross section, a height of 0.127 to 0.178 millimeter, and an extended smooth surface of 0.127 to 0.381 millimeter width adapted to engage the bonding surface of the first lens member. The smooth extended surface of the energy director of the second lens member is mated with the bonding surface of the first lens member, and pressure in the range of 55.1 to 68.9 KN/m.sup.2 applied thereto to force the lens members together. Ultrasonic energy is applied to the lens members for a weld time period of 0.15 to 0.22 second. Following the weld period, the application of ultrasonic energy is discontinued for a hold time period of 0.15 to 0.25 second. The application of pressure is discontinued following the hold time period.
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