1. Field of the Invention
The present invention relates to a motor-driven zoom lens barrel in which the zooming can be driven by a motor.
2. Description of Related Art
In a known motor-driven zoom lens barrel, a switching lever which actuates a clutch is provided to select the powered zooming operation or the manual zooming operation. However, the presence of the switching lever makes it difficult in terms of space to also provide a driving switch, for selectively rotating the motor in the forward or reverse directions and a manual zooming operation ring within the limited space of the lens barrel, since the lens barrel has various operational members including an existing focusing ring, a diaphragm adjusting ring, etc. Also, the operation of the camera becomes complex. Furthermore, it is necessary to provide an adjusting resistance to adjust the zooming speed.