Scales for position determining apparatus having marks of differ

Details Scales for position determining apparatus having marks of differ Scales for position determining apparatus having marks of differ

1990-07-23

1991-04-02

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Displacement

G01B 714

Patent

active

050049828

ABSTRACT:
A scale is fixed to one part of a position determining apparatus, and a read head is relatively movable on the other part of the apparatus. Incremental scale marks are regularly spaced along the scale and are counted in a counter to give an indication of relative position of the scale and read head. The marks may for example be recorded magnetically. Some scales are distinguishable from the other, e.g., by having different amplitudes. Positioning information can then be encoded in a binary word. This can either be absolute position values, or error correction information.

REFERENCES:
patent: 2947168 (1960-08-01), Yang
patent: 3993946 (1976-11-01), Makino
patent: 4305072 (1981-12-01), Makita
patent: 4490914 (1985-01-01), Spies
patent: 4519140 (1985-05-01), Schmitt
patent: 4787255 (1988-11-01), Guay

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