| 摘要 |
PURPOSE:To facilitate attaching and detaching of a lens to form a U-shape cavity which has an opening in a column to which the lens is attached. CONSTITUTION:A lens 51 is attached to a mirror cylinder 56 by a lens flange 520. The mirror cylinder 56 is inserted into a mirror cylinder holder 57 and fixed to the holder 57 by ring nuts 550. The lens attaching part composed like this is fixed to a column 8 by a holder receptacle ring 58. A U-shape cavity 83 which has an opening is formed in the column 8. The lens attaching part can be attached and detached to the direction of an arrow from the opening side of this cavity. |
