ZERO POINT DETECTING DEVICE OF PHOTOELECTRIC ENCODER
PURPOSE:To obtain an exact zero point detecting signal having no directional error, by detecting 2 kinds of zero point reference signals being opposite in polarity, at a desired zero point position. CONSTITUTION:On a main scale 10, 2 rows of zero point detecting optical lattices 10c, 10d are provide...
Gespeichert in:
Hauptverfasser: | , , |
---|---|
Format: | Patent |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext bestellen |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | PURPOSE:To obtain an exact zero point detecting signal having no directional error, by detecting 2 kinds of zero point reference signals being opposite in polarity, at a desired zero point position. CONSTITUTION:On a main scale 10, 2 rows of zero point detecting optical lattices 10c, 10d are provided, and on each lattice 10c, 10d, its light screening part and light transmitting part are provided in reverse to each other. Also, at a position opposed to the lattices 10c, 10d, a zero point detecting optical lattice 12c is provided on an index scale 12. At the side of the lattice 12c, zero point detecting photodetectors 20, 22 are placed at a position opposed to the lattices 10c, 10d, light, and shade of light are detected, and zero point reference signals 200, 202 being opposite in polarity are supplied to a comparator 24. Subsequently, a comparison output 204 is converted to a pulse 26, and a zero point detecting signal 206 is obtained. |
---|