Scanning unit for a position measuring device

摘要

A holder (5) having a light source (6) and a lens (7), is adjustably supported in a recess of a support (3), with a scanning plate (8) at the base such that the source, lens and plate are aligned in a same line along longitudinal direction. The holder is guided upon the recess guide surfaces (10,11) in specific direction and rotatable in all directions, to rest against the guide surface at specific point. An independent claim is also included for position measuring system.