b and driver 9 c the first ccd 6 is driven based on the field signal which has the reverse phase of the second ccd 7 in fig2 fld 1 is the field signal for driving the first ccd 6 and fld 2 is the field signal for driving the second ccd 7 fld 1 and fld 2 are field signals which alternatingly repeat the odd field and even field the field signal fld 1 and the field signal fld 2 have the same frequency and their phase difference is u03c0 the field signal fld 1 has a phase which is the reverse that of the field signal fld 2 therefore when the field signal of the first ccd 6 is even the field signal of the second ccd 7 is odd and conversely when the field signal of the first ccd 6 is odd the field signal of the second ccd 7 is even either the first ccd 6 or the second ccd 7 are normally in a state capable of image sensing since they are driven by the field signals fld 1 and fld 2 although the first ccd 6 and the second ccd 7 are driven based on field signals having reverse phases in the present embodiment they also may be.