Coded data generation or conversion – Digital pattern reading type converter
Patent
1989-04-10
1990-12-18
Miska, Vit W.
Coded data generation or conversion
Digital pattern reading type converter
341 13, 341 15, H03M 122
Patent
active
049789546
ABSTRACT:
A non-contact type potentiometer employing a triangular wave encoder includes a triangular wave encoder for outputting a triangular wave signal consisting of a LEAD signal and a LAG signal having the phases different from each other. A pair of comparators are provided for waveforming the triangular wave signals into a pair of rectangular wave signals. An up/down signal converter is provided for converting each of the rectangular wave signals into up/down directive pulses, and an up/down counter is provided for receiving the directive pulses and outputting an absolute digital signal which is supplied to a D/A converter for converting the absolute digital signal into analog position step signals. An analog switch control circuit having a first switch and a second switch and supplied with the LEAD signal and a LEAD signal inverted from the LEAD signal is also turned on or off by being supplied with the rectuangular wave signals B obtained from the LAG signal and a rectangular wave signal B inverted from the rectangular wave signal B. An operational amplifier is provided for summing together the output signal from the analog switch control circuit and the analog position step signal. The above switches are controlled responsive to the high level of the rectangular wave signals to supple the LEAD signal or the LEAD signal to be summed with the analog position step signal to produce a linear analog potentiometer output signal from the operational amplifier.
REFERENCES:
patent: 3238361 (1966-03-01), Frisch
patent: 4072893 (1978-02-01), Huwyler
patent: 4631539 (1986-12-01), Sanders et al.
patent: 4803354 (1989-02-01), Onodera et al.
Miska Vit W.
Tamagawa Seiki Kabushiki Kaisha
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