Video camera having circuit for setting exposure compensation va

Details Video camera having circuit for setting exposure compensation va Video camera having circuit for setting exposure compensation va

1996-08-01

1997-05-20

Horabik, Michael

Television

Camera, system and detail

Solid-state image sensor

348228, 348366, H04N 5335

Patent

active

056317050

ABSTRACT:
In a device for controlling an imaging device, a voltage .phi.V.sub.SUB which is applied to a substrate of a CCD is changed in accordance with an exposure compensation value. Switches are turned ON or OFF in accordance with the exposure compensation value, and an MPU 15 accordingly controls a substrate voltage control circuit. When the exposure compensation value has a positive value, the substrate voltage .phi.V.sub.SUB is set to a high value, so that the saturation level of the CCD becomes low; thus, an overflown surplus electric charge caused by a large amount of incident light is easily absorbed by a depletion layer of the CCD. When the exposure compensation value has a negative value, the substrate voltage .phi.V.sub.SUB is set to a low value. As a result, the saturation level of the CCD becomes high, and thus the dynamic range for sensing image luminances of varying levels is increased.

REFERENCES:
patent: 3896485 (1975-07-01), Early
patent: 4369469 (1983-01-01), Endo et al.
patent: 4963980 (1990-10-01), Suga et al.
patent: 4963983 (1990-10-01), Kohno et al.
patent: 5095226 (1992-03-01), Tani
patent: 5299015 (1994-03-01), Imaide et al.
Japanese Article entitled "CCD-Camera Technology" with partial English translation. 1986 (No Month).

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