Image scanner with automatic signal compensation using sampled reference light
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United States of America Patent
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May 18, 1993
Grant Date -
N/A
app pub date -
May 29, 1992
filing date -
May 29, 1992
priority date (Note) -
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Abstract
An image scanner includes a light source which illuminates a document being scanned, a reflex mirror set receiving a first light signal which results from light rays that are reflected by the document and a lens barrel which has an imaging lens arranged therein and which receives the first light signal from the reflex mirror set. A flexible optical transmission element has an input end provided in close proximity with the light source so as to receive a second light signal therefrom. A line image sensor is disposed adjacent to the lens barrel and receives the first light signal from the reflex mirror set and the second light signal from the optical transmission element. The line image sensor generates an image scan signal which corresponds to the first light signal and a brightness reference signal which corresponds to the second light signal. A signal compensation circuit receives the image scan signal and the brightness reference signal from the line image sensor. The signal compensation circuit processes and amplifies the image scan signal in accordance with the magnitude of the brightness reference signal, thereby compensating the image scan signal for instability in the brightness of light from the light source.
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