| 摘要 |
1464391 Semi-conductor devices FAIRCHILD CAMERA & INSTRUMENT CORP 27 Feb 1974 [21 May 1973] 8957/74 Heading H1K A charge coupled device is used as an exposure control device by transferring charge 17a accumulated in a light sensing region to a charge sink by lowering the potential 16b in an intermediate region, raising the potential 16b to a level which allows a given amount of charge 17a to accumulate in the light sensing region and excess charge 17b to transfer to the sink, transferring, after a given time, the charge 17a to an adjacent region by lowering the potential 16d of the adjacent region and of a second intermediate region to less than the potential 16c of the light sensing region, and raising the potential 16d of the second intermediate region to above that on said adjacent region on completion of the charge transfer to the adjacent region. The charge sink is a PN junction formed by an N+ region 15 in a P-doped substrate 11 and a P+ region 14 forms a channel stop zone. In an alternative embodiment, a P region (19), Fig. 3, (not shown) is formed adjacent the sink region 15 and electrodes 13d and 13c are joined together so that the potential (16m) in the first intermediate region is always at a fixed level above the potential 16c but below the potential 16d so that excess charge 17b is drained to the sink region 15.
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