An image pickup element drive control method can outputs a sharp image
effectively without producing any overlapped images when it is driven for
a high rate image pickup operation. In a high rate image pickup operation
using an interline transfer type solid state image pickup element having
a light receiving section of a plurality of light receiving elements
arranged in the form of a matrix and adapted to accumulate respective
electric charges representing the received quantity of light, a vertical
transfer section for transferring the electric charges read out from said
light receiving elements of said light receiving section and a horizontal
transfer section for outputting the electric charges transferred to it by
way of said vertical transfer section, the high speed transfer period Tc
is defined by using the pulse width of external control signal EXT-VD and
the image pickup signal is output by synchronizing the high speed
transfer that is conducted at the timing voluntarily selected when
defining the operation of the electronic shutter with the reference
signal (EXT-VD) that indicates the start of a high speed transfer period.