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US 4,540,279 AGranted
Automatic exposure device
AssigneeMita Kogyo Kabushiki Kaisha
InventorsYoichiro Irie, Yutaka Shigemura, Satoshi Namba
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AssigneeMita Kogyo Kabushiki Kaisha
InventorsYoichiro Irie, Yutaka Shigemura, Satoshi Namba
Estimating the term…
An automatic exposure device wherein the quantity of light from an exposure lamp is detected by lamp light quantity detecting means, while the reflected light from a region of a document located forwardly of a region of the document being exposed is received by density detecting means, the output signal from said lamp light quantity detecting means being used as an input by reference signal producing means which produces a reference signal, the output signal from said density detecting means and the reference signal being used as inputs by correcting means which corrects the output signal from the density detecting means in accordance with an increase in the quantity of light from the lamp, the output signal from said correcting means being used as an input by lamp control means which controls conducting-angle of the exposure lamp.
An automatic exposure device comprising lamp light quantity detecting means for detecting the light quantity of an exposure lamp, density detecting means which receives the reflected light from a region of a document located forwardly of a region of the document being exposed to detect the density of the first region, reference signal producing means which uses as its input signal the output signal from said lamp light quantity detecting means to produce a reference signal, correcting means which uses as its inputs the output signal of the density detecting means and the reference signal to correct the output signal of the density detecting means correspondingly to an increase in the lamp light quantity, and lamp control means which uses as its input the output signal of the correcting means to control the conducting-angle of the exposure lamp.
Dependencies are inferred from the claim text.