Afocal water-air lens with greatly reduced lateral color aberrat

Details Afocal water-air lens with greatly reduced lateral color aberrat Afocal water-air lens with greatly reduced lateral color aberrat

1998-07-20

2000-03-21

Epps, Georgia

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Floating or underwater type

351 62, 359744, 359796, G02C 100, G02C 1108, G02B 900

Patent

active

060394455

ABSTRACT:
An afocal lens system is provided between two different mediums having dirent indices of refraction and dispersion values, and is used in such devices as diver-masks. The lateral chromatic aberration inherent in the usual flat-surface of a transparent protecting mask is greatly reduced. This is done by an arrangement which combines a positive low dispersion lens with a negative high dispersion lens in various arrangements with each other.

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patent: 5363151 (1994-11-01), Biays et al.
patent: 5420649 (1995-05-01), Lewis
patent: 5523804 (1996-06-01), Nolan

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