Incremental length or angle measuring device

Abstract

Abstract In this device, two parallel incremental tracks (5, 6), which are offset with respect to one another by T/4, of the same incremental period T are arranged on a scale (1) on both sides of a reference marker (7). Along the scale (1), a scanning unit with a scanning plate (2) is conducted which also has an incremental division with the incremental period T, both incremental tracks (5, 6) and the reference marker (7) being scanned with this increment by photodetectors (12, 13, 14) located in one line below one another. Due to the symmetric arrangement of the incremental tracks (5, 6) relative to the reference marker (7), the required relation between the reference pulse (UR, URF) and the counting signals which are obtained from the analog scanning signals of the incremental tracks (5, 6) is retained even when the scanning plate (2) is tilted relative to the scale (Figure 1). <IMAGE>

Inventors

• 👤 Günther Dr.-Ing. Nelle

Bibliographic Details