Eastman-kodak Company

Sharma Ravi

David P Hamblen

Methods are disclosed for the manufacture of individual small lenses, which may have gradient indices of refraction. A pedestal is provided having a conduit therein and an end surface the perimeter of which may be circular or elliptical. The perimeter is defined by a sharp edge. The pedestal is supported with the end surface horizontal and facing downwards. The intersection of the conduit and the surface, also defined by a sharp edge, forms an orifice through which at least one of the liquid monomers for forming the lens is fed. Gradient index small lenses are formed by suspending a first monomer from the horizontal end surface of the pedestal and then, via the orifice, introducing the second monomer at a rate which equals the rate of inter-diffusion of the second monomer into the first monomer. Alternatively, both monomers are both fed, in mixed condition, through the orifice in continuously varying proportions. The monomer(s) are cured in the pendant condition. The gradient index small lenses so formed are aspherical and, in the case of an elliptical pedestal end surface, also anamorphic.

Method and apparatus for manufacturing aspherically shaped small lenses

Apparatus for the manufacture of individual small lenses, which may have gradient indices of refraction. The apparatus includes a pedestal having a conduit therein and an end surface the perimeter of which may be circular or elliptical. The perimeter is defined by a sharp edge. The pedestal is supported with the end surface horizontal and facing downwards. The intersection of the conduit and the surface, also defined by a sharp edge, forms an orifice through which at least one of the liquid monomers for forming the lens is fed. Gradient index small lenses are formed by suspending a first monomer from the horizontal end surface of the pedestal and then, via the orifice, introducing the second monomer at a rate which equals the rate of inter-diffusion of the second monomer into the first monomer. Alternatively, both monomers are both fed, in mixed condition, through the orifice in continuously varying proportions. The monomer(s) are cured in the pendant condition. The gradient index small lenses so formed are aspherical and, in the case of an elliptical pedestal end surface, also anamorphic.

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Penfield, NY, United States of America

Sharma Ravi