G - Physics – 01 – B
Patent
G - Physics
01
B
354/77, 79/9, 34
G01B 11/26 (2006.01) G01B 13/02 (2006.01)
Patent
CA 1049634
ABSTRACT OF THE DISCLOSURE The displacement of a first element relative to a second element in a predetermined direction is measured by a code display which has sets of code markings, each set representing a predetermined unit of displacement, spaced at predetermined dis- tances from each other in said predetermined direction. The code display also has control markings each of which indicates the center of the set of code markings taken in the predetermined di- rection. Transducers sense the code markings and the control markings and furnish, respectively, corresponding data and control signals. An output furnishes output signals corresponding to the data signals only upon simultaneous receipt of the control signals and the data signals, thereby assuring that the read-out means are substantially at the center of the code markings during read-out. The output signals may be stored until receipt of the next subse- quent control signal. -1-
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