Electronic shutter for a charge-coupled imager

Details Electronic shutter for a charge-coupled imager Electronic shutter for a charge-coupled imager

1974-04-29

1976-01-20

Libman, George H.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

178 71, 250211J, 307221D, 357 24, 357 30, H01L 3108

Patent

active

039341615

ABSTRACT:
The disclosure relates to a system for controlling the total charge collected on a charge-coupled imager to, in effect, provide an electronic shuttering action for the charge-coupled imager. The charge-coupled imager works in standard fashion and is normally biased into depletion whereby minority carriers, generated by the light impinging on the imager, are collected in predetermined charge collecting areas or wells, the charges in each well then bring read out in a serial fashion. In order to prevent collection of an excess number of charges, which is equivalent to overexposure in a photographic sense, the majority carriers which are necessarily generated simultaneously with the minority carriers, are collected and integrated so that when a predetermined amount of charge is measured, a shuttering action can take place. When the basic imager is formed from p-type silicon, the majority carrier charges are collected by providing an ohmic contact to the p-type substrate. Two modes ofoperation are disclosed. The first mode is suitable for imaging applications and the second mode is suitable for laser warning receivers.

REFERENCES:
patent: 3390273 (1968-06-01), Weckler
patent: 3715485 (1973-02-01), Weimer
patent: 3771149 (1973-11-01), Collins et al.
patent: 3801884 (1974-04-01), Sequin

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