| 摘要 |
PURPOSE:To obtain the accurate focus of an optical lens with simple constitution and to reduce the size, weight, and cost of an autofocus device by oscillating a solid-state image pickup element in the directions of the optical axis of an optical lens, and detecting the fine definition signal of the solid-state image pickup element and adjusting the focus of the optical lens. CONSTITUTION:The solid-state image pickup element 22 is oscillated by a moving means 27 to an optional amplitude in the directions of the optical axis of the optical lens 21 while positioned at right angles to the optical axis of the optical lens 21. A detecting means 32 detects the fine definition signal of the solid-state image pickup element 22 from the output signal of the element 22 in its movement and an optical lens driving means 28 moves the optical lens 21 so that an image becomes sharper. |
