Encoder disc

Details Encoder disc Encoder disc

G - Physics

01

D

340/136.2

G01D 5/34 (2006.01)

Patent

CA 1305766

ABSTRACT OF THE DISCLOSURE An encoder disc for a photoelectric shaft angle encoder includes a disc body which defines first and second regions. The first region is defined be- tween two circles of differing radii and offset centers positioned such that the two circles are substantially tangent at one point and the smaller circle is con- tained within the larger circle. The second region is situated adjacent to the first region, and the first and second regions have differing light transmission characteristics. The first region forms a measuring track which varies in width substantially sinusoidally around the disc body. Especially good results are ob- tained when the two circles are offset from the central axis of the disc body by substantially equal amounts.

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