Afocal objective lens

Optical: systems and elements – Having significant infrared or ultraviolet property – Lens – lens system or component

Patent

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Details

359357, 359673, 359828, 359829, G02B 1314, G02B 1512

Patent

active

052145328

ABSTRACT:
An accessory lens for a far-infrared thermal imager which is quickly insted or removed to double the range. The accessory uses two or three element with alternating dielectric constants and combinations of spherical and aspherical surfaces.

REFERENCES:
patent: 3368078 (1968-02-01), Flint et al.
patent: 3778133 (1973-11-01), Tatian
patent: 4380363 (1983-04-01), Fjeldsted
patent: 4397520 (1983-08-01), Neil
patent: 4505535 (1985-03-01), Neil
patent: 4695119 (1987-09-01), Neil
patent: 4834472 (1989-05-01), Palmer
patent: 5024493 (1991-06-01), Fantozzi et al.

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