Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1992-08-20
1993-09-14
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250570, 353 26A, G01N 2186
Patent
active
052451992
ABSTRACT:
A mark detecting apparatus comprises an illuminator means for illuminating a film with marks having density different from the density of its periphery, a plurality of photosensors arranged in the feeding direction of the film, which serve as light receivers for receiving the transmitting light of the film illuminated by the illuminator means to detect the presence of marks, setting device for establishing a reference value on the basis of the maximum value and quasimaximal value among each of the output signals of the photosensors, and discriminator for discriminating the presence of marks by comparing the reference value established by the setting device and the output of the light receivers. With the structure thus arranged, it is possible to establish the binalizing reference value of the photosensors accurately even when the fluctuation of the luminous energy of the light source occurs as well as to correctly establish the reference value reliably even when the base density of the film varies.
REFERENCES:
patent: 4207473 (1980-06-01), Nakatani et al.
patent: 4219737 (1980-08-01), Gagnon et al.
Canon Kabushiki Kaisha
Nelms David C.
Shami K.
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