Incremental optical encoder system with addressable index

Details Incremental optical encoder system with addressable index Incremental optical encoder system with addressable index

G - Physics

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354/77

G02F 7/00 (2006.01) G01D 5/243 (2006.01) H01J 3/14 (2006.01) H03M 1/00 (2006.01)

Patent

CA 1189194

ABSTRACT The circuitry required to obtain a pair of quadrature square waves which form a high resolution angle designating signal in an incremental encoder is reduced by use of a quadrant switched multiplier. The bits of a multibit binary word are gated with a coarse index taken from the code disc to provide a completely addressable precise index having a resolution matching that of the quadrature pair. The multibit binary word includes square waves already available in the multiplier and an additional bit obtained from a logical combination of the pair of quadrature signals.

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