Condensing lens group e.g. achromatic condensed lens group has clamping devices that are contacted with elastic plastic ring to clamp elastic plastic ring on socket

摘要

The condensing lens group has lenses (8-10) which are held in a sleeve-shaped socket (20), and adjusting screws (5-7) which are provided for lenses in intended axial position of sleeve-shaped socket. The plastic pins (1-3) are provided between adjusting screw and outer surface of associated lens. An elastic plastic ring (11) is abutted with outer edge at radially inwardly projecting portion of the socket, and is held by the retaining ring (4). The clamping devices are contacted with the elastic plastic ring to clamp the elastic plastic ring on the socket.