Measuring device for determining the displacement of a movable o

Details Measuring device for determining the displacement of a movable o Measuring device for determining the displacement of a movable o

1994-09-09

1997-06-17

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2505594, 356373, 33707, H01J 314, H01J 516

Patent

active

056400080

ABSTRACT:
A measuring device for determining the displacement of a movable object includes a graduation element which is mechanically connected to the object whose displacement is to be determined. The graduation element comprises at least a track which is formed by a plurality of successive grating strips located transversely to the direction of movement of the object. The measuring device also includes a radiation source, a detector and a reflective optical system which comprises at least a beam collimating element. The reflective optical system guides the radiation from the radiation source to the graduation element and changes it to an elongate radiation beam which is parallel on average in the cross-section perpendicular to the grating strips.

REFERENCES:
patent: 3589235 (1971-06-01), Rogers
patent: 3973119 (1976-08-01), Renes et al.
patent: 4340814 (1982-07-01), DiCiaccio
patent: 4597665 (1986-07-01), Galbraith
patent: 5309276 (1994-05-01), Rodgers

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