Optical: systems and elements – Extended spacing structure for optical elements
Patent
1984-05-21
2000-09-12
Moskowitz, Nelson
Optical: systems and elements
Extended spacing structure for optical elements
359222, 359593, 359613, 359894, H01Q 1502, G02B 300
Patent
active
061167401
ABSTRACT:
A window for utilization in the receiving of intelligence from a modulated beam of collimated light, with the window being configured to restrict the field of view of the optical system used therewith, and employing the phenomenon of total internal reflection. Such a window may be used to reject the entry of unwanted radiation, such as noise, and comprises first and second generally triangularly shaped wedges of optical material. The entry face of the first wedge is generally perpendicular to a base plane, and its rear face is disposed at an acute angle to the entry face. The entry face of the second wedge is disposed at the same angle to the base plane as the rear face of the first wedge, and the two wedges are separated by a small air gap. Preferably, the rear face of the first wedge is contoured to reject incoming radiation from a direction below the base plane, with comparable contouring of the closely adjacent faces of the first and second wedges serving to permit the entry of intelligence in the form of skew rays, thus to substantially increase the directions in which desired radiation may be admitted to the optical system.
REFERENCES:
patent: 3808428 (1974-04-01), Barry et al.
patent: 4088884 (1978-05-01), Rast et al.
patent: 4217026 (1980-08-01), Radovich
patent: 4302796 (1981-11-01), Gustavson et al.
Linlor, W.I.; "Baffle System Employing Reflective Surfaces"; pp 1-34, NTIS N84-13985/6; abst. supplied.
Amon Max
Luty Clifford J.
Chin, Esquire Gay
Lockheed Martin
Moskowitz Nelson
Renfro, Esq. Julian C.
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