Laminar flow dust shield for wide angle lens

Details Laminar flow dust shield for wide angle lens Laminar flow dust shield for wide angle lens

1991-02-26

1992-05-19

Henry, Jon W.

Optical: systems and elements

Protection from moisture or foreign particle

Fluid directed across optical element

359507, 15405, B08B 502, G02B 2316

Patent

active

051153424

ABSTRACT:
Apparatus for preventing the deposition of dust on a surface, for example, the transparent surface of an optical instrument, is provided. The apparatus includes a tube and a hollow porous frustrum. The surface is placed inside the tube. The small opening of the frustrum is placed adjacent the surface, and the large opening of the frustrum is sealed against the inner wall of the tube. Compressed gas is flooded into the tube, passes through the frustrum and sets up a laminar gas flow away from the surface, thus preventing the deposition of dust on the surface.

REFERENCES:
patent: 3321265 (1907-05-01), Clave et al.
patent: 3685882 (1972-08-01), Van Der Jaqt
patent: 3696230 (1972-10-01), Friedrich
patent: 4240691 (1980-12-01), Holmqvist et al.
patent: 4315692 (1982-02-01), Heinecke et al.
patent: 4738528 (1988-04-01), Craft
patent: 4784491 (1988-11-01), Penney et al.
patent: 4786188 (1988-11-01), Myhre et al.
patent: 4836689 (1989-06-01), O'Brien et al.

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