| 摘要 |
PURPOSE:To miniaturize and simplify the structure by moving the groups of zoom lenses directly by the rotation of the rotor of a stepping motor through which light can pass. CONSTITUTION:A zooming cam 21 is rotated by the rotation of a rotor 24 of a stepping motor consisting of a stator 26 and a rotor 24 which form an optical path, and pins 14, 17 inserted into cam grooves 22, 23 are moved along sliding rods 18, 19. Then, together with lens barrels 13, 15 to which pins 14, 17 are fixed, a variater lens 12 and a compensator lens 15 contained in the barrels are moved continuously in the direction of an optical axis and the zooming ratio is adjusted. The zooming ratio is detected through a sliding piece 26 that is slid on a zooming ratio detector 27 by rotation of the zooming cam 21. As the zoom lens groups 12, 15 are directly driven and controlled by the rotor 24 of the stepping motor, and the optical path is provided in the stepping motor, the structure is miniaturized and simplified. |
