G - Physics – 08 – C
Patent
G - Physics
08
C
340/136.2
G08C 21/00 (2006.01)
Patent
CA 1174320
TITLE OF THE INVENTION OPTICAL TRANSDUCER FOR DETECTING THE ANGULAR POSITION OF A ROTATING MEMBER WITH RESPECT TO A FIXED STRUCTURE, ABSTRACT OF THE INVENTION 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 portion 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.
373522
Olivetti (ing. C.) & C. S.p.a.
Ridout & Maybee Llp
LandOfFree
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