| 摘要 |
PURPOSE:To prevent the occurrence of flare on an image pickup face, by providing a light shielding plate, which has a light shielding means of the surface, on the optical-axis side of a pole which moves and guides a lens along the optical axis. CONSTITUTION:Three poles 5 are laid transversely between a flange 3 and a ring 6 of a barrel 2, and a variator 8 and a compensator 14 which are moved back and forth by turning of a cam cylinder 4 are slided and guided by these poles. Light shielding plates 7 are attached to poles 5 on the side of an optical axis L as one body, and ruggedness where a low gloss coating material 17 is applied is formed on a light shielding means 16 which is provided on the optial- axis side of each light shielding plate 7. In case that the variator 8 and the compensator 15 are moved back and foth through poles 5 to photograph, a strong light l1 is absorbed by light shielding means 16 or is reflected irregularly even if it is made incident to the lower side of poles 5 in the optical path. Consequently, the occurrence of flare on the image pickup face is prevented. |
