Positioning device for reading and/or writing on optical record carrier, guides laser beam via reflector to distance sensor

摘要

One arm of a lever (28) is driven via an articulated shaft (29) and a piezo-element (20) with a pressure plate (27). The other arm of the lever abuts the stroke shaft (11) with a rotary shaft (8). The stroke shaft is biased w.r.t. the end stop (7) by a spring (9). The optically modulated laser beam (50 reflected from a data track (3) reaches an optical device (47) via a deflector unit. The optical device diverts and splits the reflected laser beam to sensors.