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AssigneeSola Products Limited
InventorsHarold N. Roscrow, Ronald W. Ewer, Philip H. Squires
Estimating the term…
A gasket assembly for casting optical lenses includes a first gasket member having a cylindrical opening therethrough and an annular flange extending radially inwardly in the cylindrical opening. One surface of the flange is adapted to receive a casting lens die, and may be disposed in a plane not perpendicular to the axis of the cylindrical opening. A second gasket member is adapted to be received in the first gasket member, and includes an inwardly extending annular flange having one surface adapted to mate with the flange of the first gasket member. The other side of the annular flange of the second gasket member includes a shaped surface adapted to receive a lens casting die having the capability of conferring on the cast lens any combination of power and cylinder characteristics, the shaped surface being configured to mate and seal with the peripheral area of the compound surface of the die. The gasket members may be mated together with the second gasket member rotatable in its mating arrangement with the first, so that a limited number of casting dies and gasket members may be used to cast lenses of any combination of sphere power, cylinder power, prism, and any other desired ophthalmic characteristics.
A method of casting an optical lens with a pair of dies having curved casting surfaces, comprising the steps of placing one of said dies in a first gasket member, locating said first die at the desired angular orientation with respect to said first gasket member, providing a second gasket member adapted to receive the other die, assembling said gasket members so as to be able to orient properly said other die with respect to said first die, inserting said other die in said second gasket member in a predetermined angular orientation therewith and in confronting relationship with said first die, introducing a non-form-retaining optical casting composition between said confronting die surfaces and curing said casting composition to form a lens.
A method of forming a lens from a liquid casting composition by placing the liquid in a cavity formed between two mold parts held in a gasket having an internal flange, and thereafter curing the polymer, comprising the steps of:
A lens casting gasket assembly for casting lenses between two dies, one having a spherical molding surface and the other having a toroidal molding surface, comprising a first gasket member having a first central passage therein, one end of said passage including first means to receive said one of said dies in mating relationship, said first means including means for introducing prism into said lens, a second gasket member having a central passage therein, a portion of said central passage including second means to receive said other of said dies in mating relationship, means for joining said gasket members together with said dies disposed in confronting, spaced relationship, said dies and gasket members defining a closed lens casting cavity, means for selectively varying the axis of said toroidal molding surface, including means for joining said gasket members in mating relationship at an angle about the axis of said central passage.
Dependencies are inferred from the claim text.