Optical rotation detecting apparatus

Details Optical rotation detecting apparatus Optical rotation detecting apparatus

1983-03-03

1987-02-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340347P, G01D 534

Patent

active

046441573

ABSTRACT:
An optical rotation detecting apparatus for a bushless dc motor detects rotation information of the shaft by the slits arranged at equal pitches along the circumference of a rotary disk and a photoelectric conversion element arranged circumferentially at a pitch which is an integral multiple of the slit pitch and including a first set of photoelectric conversion element pieces arranged alternately with the former thereby generating a first rotation information signal having a frequency proportional to the rotational speed of the shaft and a second rotation information signal having a 90-degree phase difference with the first rotation information signal. The phases of the first and second rotation information signals are compared to detect the direction of rotation of the shaft. The accuracy of rotation information can be further improved by increasing the number of photoelectric conversion element pieces per slit pitch. The photoelectric conversion element includes an amorphous silicon photoelectric conversion element.

REFERENCES:
patent: 3757128 (1973-09-01), Vermeulen
patent: 4024446 (1977-05-01), Burnett
patent: 4079252 (1978-03-01), Brake
patent: 4421980 (1983-12-01), Kuhne
patent: 4477189 (1984-10-01), Ernst

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