Method and apparatus for ultra-high-sensitivity, incremental and

Details Method and apparatus for ultra-high-sensitivity, incremental and Method and apparatus for ultra-high-sensitivity, incremental and

1997-05-07

1999-10-12

Le, Que

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023118, G01D 534

Patent

active

059658797

ABSTRACT:
An absolute optical linear or rotary encoder which encodes the motion of an object (3) with increased resolution and encoding range and decreased sensitivity to damage to the scale includes a scale (5), which moves with the object and is illuminated by a light source (11). The scale carries a pattern (9) which is imaged by a microscope optical system (13) on a CCD array (17) in a camera head (15). The pattern includes both fiducial markings (31) which are identical for each period of the pattern and code areas (33) which include binary codings of numbers identifying the individual periods of the pattern. The image of the pattern formed on the CCD array is analyzed by an image processor (23) to locate the fiducial marking, decode the information encoded in the code area, and thereby determine the position of the object.

REFERENCES:
patent: 5563408 (1996-10-01), Matsumoto et al.

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