Coded data generation or conversion – Digital pattern reading type converter – With directional discrimination
Patent
1989-09-05
1990-04-17
Shoop, Jr., William M.
Coded data generation or conversion
Digital pattern reading type converter
With directional discrimination
318603, H03M 124
Patent
active
049184431
ABSTRACT:
For the purpose of knowing an angular position and a rotational speed of a rotary body, according to an encoding pattern on an encoder mounted to and synchronously rotated with the rotary body, rotational angular position signals consisting of n-phase rectangular waves and sensing pulses occurring at a predetermined rotational angle interval are generated. In response to the issue of each sensing pulse, levels of the respective rotational angular position signals are detected, a variation pattern of a combination of the detected n levels is compared with a reference variation pattern, and it is determined whether an abnormal condition has arisen or not, and if the condition is normal, whether the variation pattern is a forward traveling pattern or a backward traveling pattern. In the case of the forward traveling pattern, (+1) is added to a rotational angle counter, while in the case of the backward traveling pattern, (-1) is added to the rotational angle counter.
REFERENCES:
patent: 4442532 (1984-04-01), Takemura
patent: 4587513 (1986-05-01), Burrowes et al.
Murai Shigenobu
Takimoto Akiyoshi
Yoshida Yukio
Hoff Marc S.
Shoop Jr. William M.
Yoshida Kogyo K. K.
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