Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1985-07-01
1987-12-29
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250231SE, 340341P, G01D 534
Patent
active
047162929
ABSTRACT:
The linear incremental measuring system comprises an incremental scale, a scanning unit for generating two analog signals, which are displaced in phase in a direction depending on the direction of the scanning movement, and a processor for generating digital signals from the analog signals and for delivering said digital signals to a bidirectional counter, which is used to control a display device and/or a control device. In order to detect in a simple manner the velocity of the scanning movement relative to the scale and to generate a voltage that is proportional to that velocity and can be used to control a machine, digital signals derived from the analog signals are delivered to a digital-to-analog conversion circuit, which delivers an analog voltage that is proportional to the velocity of the scanning movement and has a polarity that is dependent on the direction of that movement.
REFERENCES:
patent: 3631443 (1971-12-01), Halfhill
patent: 3811091 (1974-05-01), Ha et al.
patent: 4306220 (1981-12-01), Schwefel et al.
patent: 4529964 (1985-07-01), Minami et al.
patent: 4614869 (1986-09-01), Hoshino et al.
Rieder Heinz
Schwaiger Max
Dubno Herbert
Lianides Ronald
Ross Karl F.
RSF-Electronik Gesellschaft m.b.H.
Westin Edward P.
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