| 主权项 |
1. An optical instrument, comprising:
a plurality of focus lens groups, including first and second focus lenses capable of moving in an optical axis direction, a plurality of focus drivers, including first and second focus drivers for respectively independently driving the first and second focus lenses within the plurality of focus lenses, a memory for storing first and second focus position characteristic data representing relationships between a specified subject distance and positions at which the plurality of focus lens groups reach a focused state, and a lens controller for controlling respective drive amounts for the first focus drive section and the second focus drive section, the lens controller comprising
a first focus lens movement target position determination section for determining movement target position and movement period for the first focus lens,a first focus lens control position determination section for determining a control target position for every fixed period by referencing first focus position characteristic data that has been stored in the memory, based on the movement target position and movement period of the first focus lens, anda second focus lens control position determination section for determining a control target position for every fixed period by referencing second focus position characteristic data that has been stored in the memory, based on control target position that has been determined by the first focus lens position determination section, wherein the plurality of focus drivers carry out driving of the first and second focus lenses based on control target positions for every fixed period that have been determined by the first and second focus lens control position determination sections. |
