| 摘要 |
PURPOSE:To improve durability and stability by fixing the 1st and the 2nd detecting means on the same plane and detecting the positions of a focus ring and a zoom ring optically without contacting. CONSTITUTION:The focus ring 11 and zoom ring 12 are rotatable by a specific angle on the outer periphery of a main lens barrel body 19 about a lens optical axis 20. Light-and-dark pattern parts 11a, 11b, and 11c, and light-and-dark pattern parts 12a and 12b are arranged on the outer peripheries of the rings. The 1st photosensor is arranged on a P plate 17 opposite the light-and-dark pattern parts 11a and 11b, the 2nd photosensor 14 opposite the light-and-dark pattern part 11c, and the 3rd photosensor 15 opposite the light-and-dark pattern part 12a, and the 4th photosensor 16 opposite the light-and-dark pattern part 12b so that they are not parallel to one another. The P plate 17 is fixed to the main lens barrel body 19 through a fixing member 18 with, for example, screws 21 and 22. |
