Rotation angle measuring apparatus

Details Rotation angle measuring apparatus Rotation angle measuring apparatus

1992-12-17

1994-04-12

Cuchlinski, Jr., William A.

Geometrical instruments

Miscellaneous

Light direction

33 1PT, G01B 1126, G01D 5245

Patent

active

053014340

ABSTRACT:
A third reference pattern which can be detected by a first reference pattern formed on a first detecting member and cannot be detected by a second reference pattern formed on a second detecting member is formed at a first position on a rotatable disk, a fourth reference pattern which can be detected by a second reference pattern formed on the second detecting member and cannot be detected by the first reference pattern formed on the first detecting member is formed at a second position substantially rotation-symmetrical with the first position on the rotatable disk, a signal obtained by the third reference pattern of the rotatable disk being detected by the first reference pattern formed on the first detecting member is supplied as a first reference signal to one signal processing circuit, and a signal obtained by the fourth reference pattern of the rotatable disk being detected by the second reference pattern formed on the second detecting member is supplied as a second reference signal to the other signal processing circuit.

REFERENCES:
patent: 4449191 (1984-05-01), Mehnert
patent: 5032999 (1991-07-01), Finger et al.
patent: 5237390 (1993-08-01), Chaney

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