G - Physics – 01 – D
Patent
G - Physics
01
D
354/25, 340/135.
G01D 5/245 (2006.01) G01D 5/247 (2006.01)
Patent
CA 1225151
ABSTRACT OF THE DISCLOSURE In an apparatus for the digital measurements of an angle, means are provided for course and fine measurement. For the course measurement, full intervals of a generated periodic signal are counted, and for the fine measurement, a reference mark is provided within the periodic signals. For this purpose, legs of the angle to be measured are defined by two parts e.g. a stator and a rotor which are rotatably mounted with respect to one another about a common axis or shaft. A disk rotating at a constant angular velocity about the same axis with constant angular velocity supports a circular graduation made up of equidistant radial lines or sectors and gaps. Lines and gaps are sensed by appropriate sensor or pick-up elements. The above said reference mark is realised by disturbing the line width. One edge of all the scale divisions still represents an undisturbed equidistant division extending over the entire disk circle and is used for course phase measurement. The mark disturbance only consists of a displacement of the other edge and is used for fine measurement.
448890
Marks & Clerk
Wild Heerbrugg Ag
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