Device for projecting an optical line marker

Device for formation of linear optical markings comprises a light source with an associated semi-transparent lens. The lens (28, 30) has a groove-shaped geometry with a longitudinal axis perpendicular to the optical axis of the light source, whereby the lens has a first source-side light path section (38) that is reflected from the lens at an angle that depends on the position of the incident light beam along the longitudinal axis of the lens.