Encoder interpolation apparatus

US7265339B1 · kind B1 · utility

Assignee

• Avago Technologies General IP (Singapore) Pte. Ltd. · SG

Inventors

• Kean Foong Ng · Bukit Mertajam, MY
• Siang Leong Foo · Bukit Mertajam, MY

Key dates

• Filing date: May 22, 2006
• Grant date: Sep 4, 2007
• Expiry date: May 22, 2026

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D5/34
• WIPO field: Measurement
• WIPO sector: Instruments

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 D1 or D3 or when I2(x) crosses D2 or 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.