Arrangement for positioning a stop-out screen on a projection lens keeps the axial position of the stop-out screen partial section constant relative to the axial position of the optical system during orientation of the partial section

摘要

u Arrangement for positioning a stop-out screen (5) on a projection lens keeps the axial position of the stop-out screen partial section (6) constant relative to the axial position of the optical system (2) during unchanged orientation of the partial section during focusing. Preferred Features: A guiding groove (7) is provided in the wall of the screen for positioning purposes. The groove receives a counter contour arranged on the housing (1) of the optical system.