| 摘要 |
PURPOSE:To permit formation of the titled device to a lighter weight and a smaller size by moving a lens system along an optical axis direction cooperatively with a change in an image magnification and correcting the deviation amt. of the focus with the change in the image magnification. CONSTITUTION:A cam barrel 20 is so provided on the inside wall of a 1st stationary barrel 1a that said barrel can fit to the barrel 11a. A cam groove 20 for moving a television camera part 1 along the optical axis L direction and a cam groove 20b for correcting the deviation amt. of the focus with the change in the image magnification by moving the lens system 5 likewise along the optical axis L direction are formed on the outside wall of the barrel 20. A variable power ring 22 which is turned integrally with the barrel 20 by a screw 21 is provided on the upper end face. Continuous variable adjustment of the magnification of a subject image to be picked up on an image pickup element by closeup is thereby permitted. |
