Coder for measuring relative movements between two objects

Details Coder for measuring relative movements between two objects Coder for measuring relative movements between two objects

1995-05-10

1998-02-17

Gaffin, Jeffrey A.

Coded data generation or conversion

Digital pattern reading type converter

Optical

341 11, H03M 122

Patent

active

057195692

ABSTRACT:
A coder includes a measuring rule (R3) carried by one object and having at least two tracks (X, Y). The tracks are provided with simple marks distributed in a substantially identical manner over the two tracks. At least two specific marks (M1, M2) are located on two distinct tracks. Each mark limit defines a spacing change on the measuring rule. At least two mark readers (LX, LY) are carried by another object, each associated with a track whose marks it detects. A processor is connected to the readers for determining the distance and direction of the movement. The invention is useful in robotics and metrology.

REFERENCES:
patent: 4551676 (1985-11-01), Amemiya et al.
patent: 4584472 (1986-04-01), Wiblin et al.
patent: 4999623 (1991-03-01), Affa
patent: 5206645 (1993-04-01), Urich
Electronic Engineering, "Improved Optical Shaft Encoder Resolution", Petrice, vol. 59, No. 731, Nov. 1987, London GB, pp. 37-38.

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