Photo signal storing sensor device

Details Photo signal storing sensor device Photo signal storing sensor device

1988-02-03

1989-09-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250578, H01J 4014

Patent

active

048702668

ABSTRACT:
A sensor device for cumulatively storing incident light in the form of electric charge is arranged to monitor the level of the cumulatively stored electric charge; to have one mode in which the storing action is allowed to continue until the electric charge level reaches a first, high given level if the electric charge level reaches a preset level within a given period of time; to have another mode in which the storing action is allowed to continue until the electric charge level reaches the preset level if the electric charge fails to reach the preset level within the given period of time; and to cause a signal obtained by the storing action to be read out after the end of the storing action with a degree of gain which is variable according to the mode in which the storing action is performed.

REFERENCES:
patent: 4429967 (1984-02-01), Tokuda et al.
patent: 4742238 (1988-05-01), Sato

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