The present invention relates to a technology for reducing dark current noise by discharging electrons accumulated on a surface of an image sensor photodiode.
An image pickup apparatus capable of reducing the influence of dark current noise to thereby obtain excellent image quality, even when the dynamic range is expanded under a photographing condition.
However, there is some minor output due to noise in the electric circuits and detectors, even if light does not enter to the detector; this is called dark current noise.
An image sensor thus formed has a very small dark current, a very low fixed pattern noise, and images formed by means of the sensor are practically free of white spots.
As a result, when ultraviolet light is detected, the sapphire plate (2) is prevented from generating phosphorescence or fluorescence and dark noise is reduced.
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