Achromatized and athermalized two-lens reimager

Details Achromatized and athermalized two-lens reimager Achromatized and athermalized two-lens reimager

1997-10-14

1999-11-02

Spyrou, Cassandra

Optical: systems and elements

Having significant infrared or ultraviolet property

Lens, lens system or component

359356, 359362, 359793, 359794, G02B 1314

Patent

active

059781327

ABSTRACT:
A reimager comprises precisely two positive lenses wherein the chromatic longitudinal aberration lies within the depth of focus and the thermal image position variation likewise lies within the depth of focus over a temperature range of more than .+-.30.degree. (in the embodiment from -40.degree. C. to +70.degree. C.). Aspheric and diffractive surfaces are utilized and, if required, are joined on respective lens surfaces (31, 51, 53, 71, 73).

REFERENCES:
patent: 5044706 (1991-09-01), Chen
patent: 5202792 (1993-04-01), Rollin
patent: 5257133 (1993-10-01), Chen
patent: 5504628 (1996-04-01), Borchard
patent: 5691847 (1997-11-01), Chen

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