Method for avoiding entrapment of air bubbles in a lens forming material and apparatus for carrying out the method
OwnerGabriela Cocora, Halina Heidrich +3inventors
InventorsGabriela Cocora, Halina Heidrich, Lukas Lomb, Thomas Tonn, Fabian Kern
Life of this patent
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Abstract
A method for avoiding the entrapment of air bubbles (5) in a lens forming material (4), in particular in a low viscosity lens forming material, in an ophthalmic lens manufacturing process using mold halves (2, 3) each having a lens forming surface (21, 31) comprises electrostatically charging (60) a lens forming surface (21, 31) of the mold half (2, 3) prior to the lens forming surface (21, 31) coming into contact with the lens forming material (4).
Claims19
A method for avoiding entrapment of air bubbles (5) in a lens forming material (4) in an ophthalmic lens manufacturing process using mold halves (2, 3) each having a lens forming surface (21, 31), said method including the step of providing an electrostatic charge (60) on a lens forming surface (21, 31) of at least one of said mold halves (2, 3) prior to said lens forming surface (21, 31) coming into contact with said lens forming material (4).
An apparatus for avoiding entrapment of air bubbles (5) in a lens forming material (4), in an ophthalmic lens manufacturing process, the apparatus comprising a charging electrode (6) and at least one mold half (2, 3) having a lens forming surface (21, 31), said charging electrode (6) and said lens forming surface (21, 31) being arranged relative to each other in a manner such that during a predetermined charging time interval said lens forming surface (21, 31) is arranged at a predetermined distance (71) from said charging electrode (6) with said lens forming surface (21, 31) facing towards said charging electrode (6), with a DC voltage of a predetermined magnitude being applied to said charging electrode (6) to cause said electrostatic charge (60) to be provided on said lens forming surface (21, 31) of said at least one mold half (2, 3).
Dependencies are inferred from the claim text.