Measuring device for determining an absolute position of a movab

Details Measuring device for determining an absolute position of a movab Measuring device for determining an absolute position of a movab

1992-02-18

1994-01-18

Cuchlinski, Jr., William A.

Geometrical instruments

Distance measuring

Scale reading position sensor

33707, 356373, G01B 1103, G01B 1303, G01B 1303

Patent

active

052790444

ABSTRACT:
The measuring device (1) comprises a scale graduation element (3) provided with a number of tracks (9, 13), a pick-up device (5) which comprises a number of sensing elements (4, 6) provided with sensors, which number corresponds to the number of tracks (9, 13), and also comprises a signal processing system (7). The tracks (9, 13) include an incremental track (9) and an absolute track (13). Both tracks are formed as a succession of strip-shaped parts (11, 15), each of which has a property which can be detected by the sensors of the sensing elements (4, 6). This property is dependent on the location on the scale graduation element (3). This property is preferably bivalent. In the signal processing system (7) signals originating from the sensing element (4) associated with the incremental track (9) and signals originating from the sensing element (6) associated with the absolute track (13) are combined. On the absolute track (13) the property is distributed in a pseudo-random fashion between the strip-shaped parts (15) so that the combination of signals for a pitch (17) of the incremental track (9) produces a specific value for each pitch (17). Consequently, the measurement value produced by the signal processing system (7) is absolute.

REFERENCES:
patent: 3816003 (1974-06-01), Litke
patent: 4786891 (1988-11-01), Ueda et al.
patent: 5062214 (1991-11-01), Gustafsson
Electronic Letters vol. 25 No. 21, 12 Oct. 1989 "Incremental Digital Position Encoder With Error Detection And Correction" Herts.

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