Rotary encoder and input device using the same

Details Rotary encoder and input device using the same Rotary encoder and input device using the same

1994-12-22

1997-07-01

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

345164, G01D 534

Patent

active

056441274

ABSTRACT:
The present invention includes a light receiving unit having a first and second light receiving element which receive light emitted from a light emitting element via slits formed at a rotary disk and respectively generate detection signals whose phases differ from each other substantially by 90.degree.. A first waveform shaping circuit compares the detection signal from the first light receiving element with a reference value and generates a first detection output of a rectangular waveform. A second waveform shaping circuit compares the detection signal from the second light receiving element with the reference value and generates a second detection output of a rectangular waveform. A peak hold circuit receives the detection signal from the first light receiving element and holds the peak value thereof. A reference value generating circuit generates the reference value depending on the peak value held at the peak hold circuit.

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