Encoder interpolation apparatus

Details Encoder interpolation apparatus Encoder interpolation apparatus

2007-09-04

2007-09-04

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C341S013000

Reexamination Certificate

active

11439352

ABSTRACT:
An interpolating detector for generating a position signal indicating a change in the relative position of a code pattern that includes alternating light and dark stripes is disclosed. The interpolating detector includes a photodiode array, an interpolation function generator, a detector function generator, and a cross-point detector. The photodiode array includes a plurality of sets of photodetectors that generate sinusoidal signals having different amplitudes and phases. The interpolation function generator generates first and second interpolation functions, I1(x)=f1 cos(x) and I2(x)=f2 sin(x), respectively, from the photodiode signals. The detector function generator generates 4 detector signals, D1(x)-D4(x), from the photodiode signals. The cross-point detector generates a transition signal when I1(x) crosses D1or D3or when I2(x) crosses D2or D4. The photodiodes have active areas having a shape such that the x values at which the interpolation signals cross the detector signals occur at integer multiples of (2π/m) for a fixed m value.

REFERENCES:
patent: 5347355 (1994-09-01), Eguchi
patent: 6355927 (2002-03-01), Snyder
patent: 6747262 (2004-06-01), Willhelm
patent: 6816091 (2004-11-01), Chee

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