Pulse encoder having a circuit for diagnosing abnormalities

Details Pulse encoder having a circuit for diagnosing abnormalities Pulse encoder having a circuit for diagnosing abnormalities

1983-05-26

1986-07-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

046008357

ABSTRACT:
A pulse encoder having a circuit for diagnosing abnormalities such as the breaking of wire in LEDs or lowering of a power supply voltage, the pulse encoder comprising LEDs, a rotary lattice plate, a stationary lattice plate, light-receiving elements, and a driving unit for driving the electric signals from the light-receiving elements, the driving unit having a control terminal for controlling the output signal of the driving unit, wherein the anode of one of the LEDs connected to the ground is connected to the control terminal so that when the potential of the control terminal is lowered to a level lower than a predetermined value an alarm signal is output from the driving unit.

REFERENCES:
patent: 4418288 (1983-11-01), Imai et al.
patent: 4423958 (1984-01-01), Schmitt

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