| 摘要 |
A motor drive lens shifting system includes a picture taking lens, a drive device for driving the lens, a light receiving element for receiving light which has passed through the lens and forming an image thereon, a focus condition detector for detecting the focus condition of the image whether it is front-focus, in-focus or rear-focus, and a control device for controlling the drive device relatively to the detected focus condition such that the drive device first shifts the lens in a wide pitch to roughly adjust the lens position, and then, in a small pitch in steps to precisely adjust the lens position. The steps become gradually small in the manner of geometric progression.
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