| 摘要 |
PURPOSE:To assure automatic focusing control by setting forcibly the working position of a focusing mechanism at the long distance side based on the detection output obtained by a position detector in case the unmatched state of pictures formed by the light of a subject is large. CONSTITUTION:The image pickup output delivered through an automatic gain control circuit 12 is supplied to a contrast detecting circuit 18 consisting of an HPF15, a gate circuit 16 and a peak detecting circuit 17. The contrast detecting output obtained by the circuit 18 is supplied to a discriminating circuit 45 of an automatic focusing control part 40. While a position detector 70 detects the operation part of a focal lens part 2 of a main optical system and supplies this position detection output to the circuit 45. The circuit 45 detects that the main optical system has a big out-of-focus image state when the unmatched state of pictures formed by the light of an object is large. Then the focusing operation position is set forcibly at the long distance side based on the detection output of the detector 70. |
