Dynamic light reference system for film reader

Details Dynamic light reference system for film reader Dynamic light reference system for film reader

1975-05-21

1976-11-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250227, 250570, G01J 132

Patent

active

039926206

ABSTRACT:
In a film reader, a system is provided for deriving a dynamic reference signal proportional to the intensity of light in a flying spot scanner without obstructing any radiation from the scanner to a film being read comprising light guides each disposed with one end in an annular bracket which surrounds the flux path to the film and the other end of all light guides bundled together at the face of an auxiliary photometer. The one end of each guide is held in the annular bracket with its viewing axis pointing back toward the scanner. The viewing axes of the guides are evenly spaced and arranged to pass through a circle centered on the emitting surface of the flying spot scanner. The circle is preferably of greater diameter than the scanner.

REFERENCES:
patent: 2571306 (1951-10-01), Szegho
patent: 2779819 (1957-01-01), Graham et al.
patent: 2804550 (1957-08-01), Artzt
patent: 3443026 (1969-05-01), Townsend
patent: 3476482 (1969-11-01), Howard et al.
patent: 3566353 (1971-02-01), Gray
patent: 3835315 (1974-09-01), Gravitt
patent: 3885878 (1975-05-01), Ishak

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