| 摘要 |
PURPOSE:To prevent boundary level from becoming generating source of dark current by repeating action of sweeping out unnecessary charge and action of making the surface of peripheral area of a photo-detector accumulation state in each light receiving period at one horizontal period. CONSTITUTION:The photo-detector 1 at the time of reading is reset to voltage Vh (for instance +10V) of a reading gate section 3, and voltage of electrodes P1-P4 at the time of light receiving is made shallower voltage Vm1 (for instance +8V) than Vh, and signal charge is accumulated in the detector 1. At this time, generated charge exceeding Vm1 flows into vertical register side. In this case, scanning period out of one horizontal period makes voltage applied to vertical transfer electrodes P1-P4 to Vm1, however, in fly-back line period, electrodes P1-P4 are made low level, for instance -5V. Thus, dark current generated from a channel stopper 2 is reduced.
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