Optical transducer for detecting the angular position of a rotat

Details Optical transducer for detecting the angular position of a rotat Optical transducer for detecting the angular position of a rotat

1980-04-14

1982-08-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

G01D 534

Patent

active

043429092

ABSTRACT:
An optical transducer for detecting the angular position of a rotating member with respect to a fixed structure comprises a shell formed by two half shell portions which are assembled together by positioning projections which are provided integrally on one of the two half shell portions and which can be precisely connected to corresponding openings provided in the other of the two half shell portions. Arranged within the shell, with play, are a disc which is provided with radial openings, a hub having a plate portion for fixing the disc, a single light emitting means and a plurality of photovoltaic cells for detecting the passage of light through the openings in the disc. Two fixed masks provided with openings are interposed, one between the light emitting means and the disc and the other between the disc and the photovoltaic detection cells. The openings in the masks are aligned with the light emitting means and the detection cells in such a way as to collect the light into parallel beams substantially perpendicular to the disc. The shell has a central hole for housing the hub with play and a circular opening for housing with play the plate portion fixed to the disc. The hole and the opening in the shell provide a tortuous path which prevents the outside light from passing into the interior of the transducer.

REFERENCES:
patent: 4268747 (1981-05-01), Becchi et al.

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