| 摘要 |
PURPOSE:To perform focusing operation with higher accuracy by relatively displacing all lens groups and a photographing means by positional errors thereof as measured from a focusing target position along the optical axis, after performance of a zooming operation. CONSTITUTION:On the basis of the output signal from a distance measuring means 15, a photographing object distance is calculated, and the position of CCD 18, as taken along the optical axis, corresponding to this object distance is calculated by operation of a system controller 16, or the position A of CCD 18 as taken along the optical axis is selected from the previously stored data. Next, the positional errors of a first lens group 1 and a second lens group 2 as taken from specific positions are sensed in accordance with the output signals from the position sensors 21, 22, whereby the system controller 16 calculates the correction value B of CCD 18 as applied along the optical axis, or selects this correction value B from the previous stored data, which correction value B is added to the CCD 18 position corresponding to the photographing object distance (A + B). Then, a motor 25 is driven via a motor drive circuit 27 to adjust CCD 18 position by means of a feed screw 24, whereby the controller 16 stops the motor 25 when a target value signal is inputted thereto from a position sensor 26. |
