Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-12-14
1990-03-27
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250334, 350 68, H01J 314
Patent
active
049123211
ABSTRACT:
A radiation scanning system is used with a radiation detector that has a predefined aperture stop. A first relay lens disposed to form a first image of the radiation detector a predefined distance from the aperture stop and a second relay lens is located a predetermined distance from the first relay lens and disposed to form a second image of the radiation detector onto a line scanning apparatus. The line scanning apparatus includes a rotor having a plurality of reflective planar facets disposed uniformly around its circumference. Each of the reflective planar facet has a normal substantially perpendicular to the axis of rotation of the rotor. The rotor is interposed between the second relay lens and the second image of the radiation detector and has its axis of rotation intersecting the optical axis of the second relay lens and disposed in such a way that as the rotor is rotated the second image is caused to move in a substantially circular locus. A concave substantially toroidal mirror is positioned to receive deviated rays from a field lens position on the locus to deviated rays reflected from any given rotational positional position of the rotor onto the concave substantially toroidal mirror. The concave substantially toroidal mirror collimates the reflected rays into a parallel bundle. A frame scanning apparatus is positioned to reflect the parallel bundle of rays in a predtermined direction. The frame scanning apparatus is located at a pupil formed by the intersection of different bundles of parallel rays from the concave substantially tordoial mirror for different rotational positions of the line scanning apparatus.
REFERENCES:
patent: 3594578 (1971-07-01), Ohman
patent: 4210810 (1980-07-01), Berry et al.
patent: 4279472 (1981-07-01), Street
patent: 4349843 (1982-09-01), Laakman et al.
patent: 4574197 (1986-03-01), Kliever
patent: 4674826 (1987-06-01), Loy
Grossman Rene E.
Nelms David C.
Shami Khaled
Sharp Melvin
Texas Instruments Incorporated
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