Solid-state sensor having direct current control circuitry and logarithmic output signal
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United States of America Patent
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Nov 19, 1996
Issued Date -
N/A
app pub date -
Nov 3, 1995
filing date -
Feb 25, 1993
priority date (Note) -
Expired
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Abstract
A solid-state image sensing apparatus comprises a charge coupled device, a plurality of photosensors, and a voltage generator. Each of the photosensors receives incident light, generates a voltage logarithmically proportional to an intensity of the incident light, and is connected to a first electrode of the charge coupled device. The voltage generator generates a reference voltage logarithmically proportional to an average intensity of the incident light on the photosensors and is connected to a second electrode of the charge coupled device. Signal charges are injected into the charge coupled device, depending on the voltage impressed on the first and second electrodes, so that a direct current component of an output of the charge coupled device is controlled.
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