Electricity: measuring and testing – Magnetic – Displacement
Patent
1992-11-19
1995-01-17
Wieder, Kenneth A.
Electricity: measuring and testing
Magnetic
Displacement
32420725, 34087035, G01B 714, G08C 1906
Patent
active
053828992
ABSTRACT:
First absolute position detecting section generates an A.C. output signal having a phase electrically shifted in accordance with a position of a moving object, and samples a counted value of a counter circuit in response to an electrical phase change at a zero cross time point of the A.C. output signal, so as to output the sampled counted value of the counter circuit as absolute position data of the moving object. Second absolute position detecting section generates one or more delayed clock signals that are delayed from a clock signal on the basis of which the counter circuit counts up by an amount of time smaller than one period of the clock signal, and utilizes the one or more delayed clock signals to measure the zero cross time point of the A.C. output signal in accordance with a unit time smaller than the one period of the clock signal, so as to output, as the absolute position data, the measured time point after having been added to the sampled counted value.
REFERENCES:
patent: 4556886 (1985-12-01), Shimizu et al.
patent: 4612503 (1986-09-01), Shimizu et al.
patent: 5142226 (1992-08-01), Sakamoto et al.
Funatsu Mitsuhiro
Sakamoto Kazuya
Kabushiki Kaisha SG
Patidar Jay M.
Wieder Kenneth A.
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