Shaft angle encoder having a circuit for synthesizing a skipped

Details Shaft angle encoder having a circuit for synthesizing a skipped Shaft angle encoder having a circuit for synthesizing a skipped

1980-10-30

1983-05-10

Atkinson, Charles E.

Excavating

340347P, 371 65, G06F 1110, H03K 1334

Patent

active

043833179

ABSTRACT:
A shaft angle encoder for producing a multiplicity of output signals corresponding to a multidigit binary code word representing the angular position of the shaft, comprising a rotatable code member having a multiplicity of code tracks ranging in order from zero to n except for the omission of a skipped track having the order of n minus 1, the track of zero order having the largest divisions while the track of the order n has the finest divisions, transducer means for reading the tracks and producing corresponding electrical signals, a parity detector having inputs for receiving the electrical signals corresponding to the tracks having the orders of zero through n minus 2 and for producing a corresponding even/odd output, and an exclusive OR logic gate having inputs for receiving the even/odd output of said parity detector and the electrical signal corresponding to the track of the order n, the exclusive OR gate producing an output which synthesizes the electrical output signals corresponding to the skipped track of the order n minus 1. The track of the order n may be a sine track to produce a sine wave electrical signal, which is digitized before being supplied to the exclusive OR logic gate.

REFERENCES:
patent: 3548397 (1970-12-01), Dayton
patent: 3882459 (1975-05-01), Barlow et al.
patent: 4024498 (1977-05-01), McIntosh
patent: 4146099 (1979-03-01), Matsushima et al.
patent: 4146873 (1979-03-01), Yamanaka et al.
patent: 4173752 (1979-11-01), Yamanaka

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