Blooming protection for a nightsight

Details Blooming protection for a nightsight Blooming protection for a nightsight

1992-09-23

1995-08-01

Ben, Loha

Optical: systems and elements

Protection from moisture or foreign particle

Cap or cover

359227, 359234, 359507, G03B 1104, G02B 2602

Patent

active

054384524

ABSTRACT:
A blooming protection for a nightsight comprises a cylindrical cover of opaque material, which cover has an opening through which light can pass. The cover is plugged onto the tube on the objective side, like a protective cover. If the opaque section is aligned with a light source in the field of view, by rotating the cover, when observing a scene at night, not only is the blooming caused by said light source suppressed, but the overall contrast in the field of view is also increased. Furthermore, the life of the image-intensifier tube is extended, because of the reduced input radiation. Depending on the objective used, the shape and size of the opening in the cover through which light can pass can be constructed differently, and even variably.

REFERENCES:
patent: 1301264 (1919-04-01), Hochstetter
patent: 1353151 (1920-09-01), Deming
patent: 1755036 (1930-04-01), Sussman
patent: 2374991 (1945-05-01), Gordon
patent: 3133140 (1964-05-01), Winchell
patent: 4393403 (1983-07-01), Geis et al.
patent: 4415242 (1983-11-01), Major
patent: 4582400 (1986-04-01), Lough
patent: 4583814 (1986-04-01), Koetser
Abstract of JP 57-095767, published Jun. 14, 1982.

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