Coded data generation or conversion – Digital pattern reading type converter – Incremental
Patent
1995-02-08
1997-03-04
Williams, Howard L.
Coded data generation or conversion
Digital pattern reading type converter
Incremental
341 6, 341 7, H03M 122
Patent
active
056083947
ABSTRACT:
A position detecting apparatus and method of determining the detected position utilizing a motor driven incremental encoder to provide a signal indicative of a plurality of reference points and a moving mechanism connected to the output shaft of the motor with a sensor for detecting a plurality of division points wherein the sensor and the detected division points are moved relative to each other. The plurality of division points may be provided at equal intervals, the range of output shaft motion can be detected in the form of interval positions by detecting and measuring the output pulse count from the incremental encoder and detecting the amount of movement via the division points detected by the sensor. Using the relation between the predetermined positions of the division points of the moving mechanism and the known positions of the reference points of the incremental encoder, the absolute value of the position of the output shaft can be precisely determined. In addition, by means of changing the period of the division points of the output shaft, information can be derived as to whether the output shaft is properly within a predetermined operating range and operate the output shaft to maintain it within the operating range.
REFERENCES:
patent: 2901170 (1959-08-01), Poole
patent: 4401483 (1977-08-01), Groff
patent: 4599601 (1986-08-01), Rammelsberg
patent: 4841297 (1989-06-01), Bourgeaux et al.
Elektrotechnik, vol. 70 No. 22, 16 Dec. 1988 Wurzburg, W. Germany, pp. 38+42, XP 000110970 `Inkremental und absolut`.
Janofsky Eric B.
Seiko Epson Corporation
Williams Howard L.
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