Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1961-02-21
1977-03-29
Tubbessing, T.H.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250203R, 250239, 250338, 350301, 350303, 102 702P, H01J 314
Patent
active
040151204
ABSTRACT:
1. An opaque hollow main supporting housing and a combined light-collecting and detecting system disposed within and surrounded by said main housing at a location intermediate its spaced opposite ends, said combined system being arranged to simultaneously view through a plurality of relatively small peripherally spaced light apertures in side wall portions of said main housing all azimuths of a predetermined endless annular object field outwardly of said housing and in concentric relation to a longitudinal axis extending centrally through said housing and to detect any appreciable change in light intensity occurring at any location in said annular object field, said combined system comprising a single relatively small photosensitive detecting element disposed at a fixed axial location in said main housing, a plurality of similar relatively small light apertures circumferentially arranged in side wall portions of said housing and appreciably spaced from each other in such a predetermined manner as to have each aperture face outwardly toward a different sector of said endless annular object field and jointly simultaneously admitting into said housing light from all parts of said annular object field, an optical system aligned with each aperture and with said single photosensitive detecting element, and each optical system comprising first and second specularly reflecting surfaces, said first surface being a plane surface positioned within said housing in a plane substantially parallel to said longitudinal axis and at a location substantially midway between the aperture associated therewith and said longitudinal axis, and said second surface being a spherically curved concave surface having its center of curvature disposed substantially upon said longitudinal axis, said first surface being so disposed in said housing and relative to the light aperture associated therewith as to intercept substantially all of the light rays from said object field which enter said housing therethrough and to reflect same toward said second surface, and said second surface being so disposed in said system as to receive said reflected light rays and direct same generally toward said detecting element, the spherical curvature of said second surface being such as to focus the light rays being reflected thereby at a focal plane in said housing intermediate said second surface and said detecting element, and a positive lens element centrally disposed within said housing and in optical contact with said detecting element so as to collect the light rays passing beyond said focal plane and direct same onto said relatively small detecting element.
REFERENCES:
patent: 2137598 (1938-11-01), Vos
patent: 2664026 (1953-12-01), Kavanagh
patent: 2749801 (1956-06-01), Clotar
patent: 2949055 (1960-08-01), Blackstone
American Optical Corporation
Berkenstock, Jr. H. R.
Buczinski S. C.
Nealon William C.
Tubbessing T.H.
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