Method for the manufacture of contact lenses using microwave energy
First Claim
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1. A method of manufacturing a contact lens of appropriate optical quality consisting of:
- constructing water-tight molds, reproducing, in the mold cavity, the shape of the lens desired and wherein said water-tight molds are composed of a substantially transparent material with respect to ultra high frequency electromagnetic waves, and said water-tight molds being constructed so as to possess a thermic inertia much higher than the portion of basic composition needed to make a lens;
preparing a basic composition starting with one or several monomers having double polymerizable bonds, and having an absorbent quality with respect to ultra high frequency waves;
insuring polymerization of the composition within the sealed molds, through irradiation by means of ultra high frequency waves;
said method being characterized in that the polymerization operation is realized by arranging several molds (1), each containing an amount of basic composition, within at least one sealed metallic chamber (9) constituting a resonant cavity of a unique mode for the frequency of the ultra high frequency waves used, said molds being positioned in an area of the cavity where the electromagnetic field is approximately homogeneous and being distributed so that the amounts of basic composition contained in said molds act as a load fitted to the inside of said resonant cavity.
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Abstract
The invention concerns a method for manufacturing a contact lens, through molding within water-tight molds. The polymerization of lenses is insured by arranging a number of molds within one or several sealed metallic chambers (9) constituting a resonant cavity of a unique mode for an ultra high frequency wave; these molds are positioned in an area of the cavity where the electromagnetic field approximately of ultra high frequency waves is homogeneous, and are distributed so that the amounts of basic composition to be polymerized act as a load fitted to the inside of said cavity.
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12 Claims
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1. A method of manufacturing a contact lens of appropriate optical quality consisting of:
- constructing water-tight molds, reproducing, in the mold cavity, the shape of the lens desired and wherein said water-tight molds are composed of a substantially transparent material with respect to ultra high frequency electromagnetic waves, and said water-tight molds being constructed so as to possess a thermic inertia much higher than the portion of basic composition needed to make a lens;
preparing a basic composition starting with one or several monomers having double polymerizable bonds, and having an absorbent quality with respect to ultra high frequency waves; insuring polymerization of the composition within the sealed molds, through irradiation by means of ultra high frequency waves; said method being characterized in that the polymerization operation is realized by arranging several molds (1), each containing an amount of basic composition, within at least one sealed metallic chamber (9) constituting a resonant cavity of a unique mode for the frequency of the ultra high frequency waves used, said molds being positioned in an area of the cavity where the electromagnetic field is approximately homogeneous and being distributed so that the amounts of basic composition contained in said molds act as a load fitted to the inside of said resonant cavity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- constructing water-tight molds, reproducing, in the mold cavity, the shape of the lens desired and wherein said water-tight molds are composed of a substantially transparent material with respect to ultra high frequency electromagnetic waves, and said water-tight molds being constructed so as to possess a thermic inertia much higher than the portion of basic composition needed to make a lens;
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