Method of optically detecting position of object and position de

Details Method of optically detecting position of object and position de Method of optically detecting position of object and position de

1991-09-17

1992-07-14

Rosenberger, Richard A.

Optics: measuring and testing

By polarized light examination

With light attenuation

33707, 25023114, 250237G, G01B 1114

Patent

active

051297256

ABSTRACT:
A method of and apparatus for optically detecting the position or amount of movement of a movable object, in which a plurality of position data element arrays are provided on a scale attached to the object such that the arrays are arranged in the direction of movement of the object. A string of light beam such as a laser beam, which extends in the same direction as the position data element array, is made to illuminate one of the arrays, and the light reflected by or transmitted through the position data element array is received by a sensor array such as CCD sensor which produces a signal representing the pattern of arrangement of the data elements in the illuminated position data element array and indicating absolute position of the object, whereby the instant absolute position of the object is detected.

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