Compact infrared lens arrangement including at least three refle

Details Compact infrared lens arrangement including at least three refle Compact infrared lens arrangement including at least three refle

1990-08-17

1991-06-18

Arnold, Bruce Y.

350 12, 350622, G02B 1314

Patent

active

050244930

ABSTRACT:
The invention relates to an infrared optical system which is capable of providing an effective focal length of about 240 mm, but fitting into a spherical package whose diameter is approximately 150 mm. To achieve such a degree of compactness, the invention employs an optical path including three reflections, which in combination define a question-mark-shaped optical path. Between the first and second reflections, the transmitted beam is passed through a focal plane and then is recollimated, and the collimated beam is then passed through the succeeding two reflections, after which it is directed telecentrically onto a detector. The invention further relates to a specific combination of lenses.

REFERENCES:
patent: 2165365 (1939-07-01), Frederick et al.
patent: 2659271 (1953-11-01), Treuting
patent: 2865253 (1958-12-01), Thielens
patent: 3007051 (1961-10-01), Amara et al.
patent: 4695119 (1987-09-01), Neil
patent: 4705343 (1987-11-01), Simons

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