| 摘要 |
PURPOSE:To execute more speedily and precisely power focusing operation by setting up the operation to two stages, i.e. rapid rough movement and slow fine movement. CONSTITUTION:A power focusing operation ring is arranged on the exchange lens barrel fitting part or the exchange lens barrel side of a camera body and a switch opening/closing projection part 4a, a position regulating click groove 7, etc., are formed on a switch ring 4 interlocking with the operation ring. Switches 9a, 9b having a pair of movable armature groups for switch speed are opened/closed by the projection part 4a and a click spring 8 is engaged with the click groove to execute the power focusing operation. Consequently, power focusing to be driven in the lens extruding direction and the lens drawing-in direction rapidly (rough movement) and slowly (fine movement) with operating sense similar to manual operation. |
