| 摘要 |
PURPOSE:To suppress a picture blur to the minimum and to obtain a stable picture by controlling a focus in a distance measuring range of the whole first, in a pupil dividing method, and switching to a narrow distance measuring range of a high contrast of a photoelectric element. CONSTITUTION:As for an output of each photoelectric element of a photodetecting array D, the same signal is stored in shift registers R1, R2 through a transfer device T. An, An+1, Bn and Bn+1 are transferred to algorithm processors P1, P2 by a clock from cables K7, K8. Basing on an S value of two groups of signals, the first extent of shift corresponding to the minimum value of S in all areas of the photoelectric element is derived by the P1, and the second extent of shift by which a difference of adjacent output signals of A1-An or B1-Bn corresponds to the minimum value of S in a small section centering around the maximum point is derived by the P2, compared with a reference value by a selector V, and a lens L0 is controlled by the selected first or second extent of shift. |
