Behind stop triplet lens

Details Behind stop triplet lens Behind stop triplet lens

1995-11-29

1997-02-25

Epps, Georgia Y.

Optical: systems and elements

Lens

Multiple component lenses

359739, 359716, G02B 914, G02B 1318

Patent

active

056064616

ABSTRACT:
A triplet lens using plastic lens elements is disclosed. The triplet lens includes, in order from the object side, a glass lens element that is positively meniscus having the convex surface on the object side, a plastic lens element formed of polycarbonate, polystyrene, or a copolymer of polystyrene and methacrylate which is biconcave in shape with a more pronounced concave surface on the image side, a plastic lens having a copolymer of polystyrene and methacrylate that is biconvex in shape, and a diaphragm. Lens characteristics are chosen to satisfy various conditions for optimum imaging.

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