JPS5591267A - Image pickup device - Google Patents

Abstract

PURPOSE: To reduce the blooming and thus ensure reproduction for the wholly steady picture by providing the driving circuit which gives the time division to the pickup element plus the simple circuit such as the memory, gate circuit or the like.

CONSTITUTION: When the time-division driving is given to pickup element 3 to send the change storage pulses alternately and every frame cycle, the high- and low- sensitivity pickup signals X and Y emerge alternately at the output end of element 3. At the same time, both X and Y signals emerge alternately also at the output terminal of memory 7 with delay of one frame cycle. Then element 3 is compared with the output of memory 7 at comparator 12, and high-sensitivity gate circuits 8 and 9 operate by the output of the comparison. Thus only signals X are collected at the output side. In this same way, only signals Y are collected at the output of low- sensitivity gate circuits 10 and 11. When signal X exceeds the reference level of terminal 15 after comparison 16, video output gate circuit 13 is closed with gate circuit 14 opened. And these conditions are kept until the signal reaches the reference value. During this period, signal Y is loaded to the blooming region. In case the excessive signal exists in signal Y, comparator 19 gives the control to reduce the pulse duration of driving circuit 5. Thus the image free from blooming can be obtained.

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