| 摘要 |
The present invention relates to a zoom lens position control device. An encoding pattern, which shows a shift between a focal length changing region and a focal point adjusting region by turns, is provided for a rotary frame in which a lens group of a step zoom lens capable of setting a plurality of focal lengths is arranged. Electrical conduction/non-conduction based on the pattern is detected as an ON/OFF state. The present position of the zoom lens is determined on the basis of the ON/OFF state. When the zoom lens is shifted from the stopping position due to the application of an external force, the stopping position of the zoom lens is initialized. The operation of the zoom lens is subsequently shifted to exposure in a focal length position, where the zoom lens is originally stopped, without unnecessarily increasing release time lag.
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