| 摘要 |
PURPOSE:To keep and initial state of use and to always realize a precise automatic focusing action by previously predicting a mechanical error factor accompanying the long them use of a device and automatically correcting it. CONSTITUTION:A storage means 7 storing information for correcting the driving quantity of a focus lens 1 and a control means 6 controlling a driving means based on the output of a driving quantity detection means 2 and the information stored in the storage means 7 and allowing the storage means 7 to store the result of the arithmetic operation of the output of the detection means 2 when the lens 1 is driven by a prescribed driving quantity by the driving means at this time and the prescribed quantity as the information used for the correction of the next driving time are provided. Then, the history information showing the using state of the device is successively stored and the mechanical deteriorating state is predicted. According to the state, the driving quantity of the lens 1 is changed. |
