Code (ring) with two pairs of periodic line patterns

US7064316B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Siegbert Steinlechner · Leonberg, DE
• Axel Wenzler · Rottweil, DE
• Klaus Marx · Stuttgart, DE
• Franz Jost · Stuttgart, DE

Key dates

• Filing date: Jun 19, 2002
• Grant date: Jun 20, 2006
• Expiry date: Mar 23, 2023

Classification

• Technology area (CPC G): Physics
• CPC primary: G01L5/221
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for optical measuring data acquisition of a component that moves in a rotary or translatory manner, in particular for optical angle, torque, or distance measurement, includes generation of a first pair of periodic line patterns extending in the movement direction of the component and a second pair of periodic line patterns extending in the movement direction of the component, which each have m periods, in particular n+1 periods, over the movement range of the moving component determination of respective phases of the line patterns of the first pair and of the second pair, determination of the phase position of the first pair of line patterns on the basis of the phases and of the second pair of line patterns on the basis of the phases, and determination of the position of the component on the basis of the phase positions.