| 摘要 |
PURPOSE:To eliminate the influence of ghost light and to improve focus detecting accuracy by making ghost output value correspond to the arranged state of an object lens and storing the ghost output value beforehand. CONSTITUTION:A lens side storing means 14 stores and holds beforehand a functional type or discrete functional value with respect to the value of a focusing lens position and a zooming position segmented into plurals. On the other hand, the ghost light amount per unit light emission amount of a light emitting means 2 generated by reflection at an optical system 8 in a camera main body device 1 is thought to be fixed as long as there are not any movable parts. A camera side storing means 6 stores and holds beforehand the ghost output value of two photodetectors of a light receiving means 3 by the ghost light. Therefore, a detected focus point is obtained based on the corrected output value of the light receiving means 3 eliminating the influence of the ghost light. Thus, accuracy can be improved. |
