Rotation angle detector

Details Rotation angle detector Rotation angle detector

1988-05-06

1989-05-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

048271225

ABSTRACT:
An improved rotation angle detector of high precision includes a rotary disc formed with slits and a photo sensor array receiving light through the slits from a light source positioned opposite to the array with the disc in-between. The array consists of a plurality of MOS photo capacitors which can be fabricated with high density. Only discharges of the capacitors due to impinges of light are evaluated to determine where a boundary of the slit is located with respect to the array.

REFERENCES:
patent: 4412745 (1983-11-01), Ohtomo et al.
patent: 4644157 (1987-02-01), Ozawa et al.

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