发明授权
US5321528A Image pick-up device correcting offset errors from a plurality of output
amplifiers
失效
图像拾取装置校正来自多个输出放大器的偏移误差
- 专利标题： Image pick-up device correcting offset errors from a plurality of output amplifiers
- 专利标题（中）： 图像拾取装置校正来自多个输出放大器的偏移误差
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申请号： US799184申请日： 1991-11-27
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公开(公告)号： US5321528A公开(公告)日： 1994-06-14
- 发明人: Kenichi Nakamura
- 申请人： Kenichi Nakamura
- 申请人地址： JPX Tokyo
- 专利权人： Canon Kabushiki Kaisha
- 当前专利权人： Canon Kabushiki Kaisha
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX2-335252 19901130
- 主分类号： H04N1/028
- IPC分类号： H04N1/028 ; H04N1/04
摘要：
A multi-chip linear image sensor for use in, for example, a facsimile machine or a photocopier comprises several chip image sensors, each including photosensors and an output amplifier. To correct for the offset error of the output amplifier caused by processing variations, each chip includes a circuit enabling the amplifier to be isolated, so that its output can be sampled independently of the image signal. To eliminate the offset error a correction circuit is provided as part of the video clamp circuit, for sampling the amplifier output and subtracting it from the subsequent image signals readout through the amplifier.
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