Optical and magnetic encoder for serially transmitting absolute

Details Optical and magnetic encoder for serially transmitting absolute Optical and magnetic encoder for serially transmitting absolute

1988-03-09

1991-01-29

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324226, 25023113, G01P 336, G01D 534

Patent

active

049889451

ABSTRACT:
The rotation type absolute encoder of the present invention is constituted by a magnetic type one-pulse encoder for detecting one or more rotations, and an optical type absolute encoder comprising a plural number of aspheric LED lens as a light source, a group of detecting elements corresponding to the area of the light source, a slit disc beginning from the track of two slits, and a differential input type current-to-voltage convertor. This absolute encoder is also so constructed as to back up the circuit voltage by an external battery and an internal large capacitance capacitor when a current is cut, and has a circuit for serially transmitting a signal indicating the number of rotations and the absolute angle to an external controller, and a circuit for synthesizing and outputting one reference pulse per rotation from the signals of the magnetic type one-pulse encoder and the optical type absolute encoder.

REFERENCES:
patent: 3189788 (1965-06-01), Gady
patent: 3461570 (1972-02-01), Thompson
patent: 4423958 (1984-01-01), Schmitt
patent: 4673824 (1987-06-01), Pepper
patent: 4705943 (1987-11-01), Charlton
Design Ideas, 2119 EDN, vol. 30 (1985), Jun. 27th, No. 15, Newton, MA, USA, "Capacitor maintains data during power loss", p. 241, Stephen Crum.

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