PURPOSE: To prevent the production of an after image by forming two signal charge outlets on a photoelectric converter of CCD type element, and simultaneously producing signal charges of photoelectric converters of 2-row one set displaced by one row at every field by a vertical clock pulse used for driving.
CONSTITUTION: Since a clock pulse 1 is at "1" level in the first field, a transfer gate 9'-1 is conducted, and light signal charges stored in photodiodes of (2m- 2)th row, (2m-2)th row, 2m-th row and (2m+1)th row are fed underneath a CCD electrode 2'-1 through a transfer gate 9'-1. Since a clock pulse 3 is at "1" level in the second field, a transfer gate 9'-2 is conducted, and mixed charges of photodiodes (2m-1)th, 2m-th, (2m+1)th and (2m+2)th of 2 rows one set displaced at one row to the first field are fed undernearth the electrode 2'-3. In this manner, the signal charges of the photodiodes of all rows can be read out in the respective fields, thereby preventing the production of an after image.
TAKEMOTO KAYAO
ITOU KENJI
