Apparatus for fabricating grin lens elements by spin molding

Details Apparatus for fabricating grin lens elements by spin molding Apparatus for fabricating grin lens elements by spin molding

1992-01-27

1993-09-14

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

425135, 425145, 4251744, 425435, 425808, B29D 1100

Patent

active

052443710

ABSTRACT:
An apparatus for producing a plastic lens element having a gradient index of refraction is disclosed in which first and second monomer-containing compositions, each having a different index of refraction, are injected into a centrifugal mold. Precise control of the gradient index is achieved by varying the ratio of the two monomers over a predetermined number of steps during the filling process.

REFERENCES:
patent: 3256373 (1966-06-01), Horst
patent: 3718383 (1973-02-01), Moore
patent: 4022855 (1977-05-01), Hamblen
patent: 4451507 (1984-05-01), Beltz et al.
patent: 4666640 (1987-05-01), Neefe
patent: 4798694 (1989-01-01), Sugata et al.

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