| 摘要 |
PURPOSE:To eliminate the need for a large assembly space and to reduce the extension error of a focus lens by supporting one end part of the feed screw rod of the focus lens in an oscillatory state and supporting the other end part of the feed screw rod by an optical-axis adjusting plate. CONSTITUTION:A thrust bearing 14 has a pivot part 14a for supporting the tip part 11c of the feed screw rod 11 in the oscillatory state and a throttle 16 which is operated with a tool such as a screw driver is formed in the head part 11d of the feed screw rod 11 on the opposite side from said tip part 11c. The head part 11d of the feed screw rod 11 is supported on the optical axis adjusting plate 17 fitted to a 2nd base 8 in a position adjustable state. Therefore, even when the optical axis of the focus lens is adjusted, the fitting position of the optical axis adjusting plate 17 is only adjusted finely. Consequently, the optical axis adjusting operation is easily performed and the assembly space is small, and the cost is low and the position accuracy of the focus lens is improved. |
