Geometrical instruments – Area integrators – Electrical
Patent
1987-05-21
1988-12-27
Martin, Jr., William D.
Geometrical instruments
Area integrators
Electrical
250237G, 356374, G01D 534
Patent
active
047930675
ABSTRACT:
An instrument for measuring the relative position of two objects comprises a scale with an incremental graduation defining a measuring direction X. A plurality of identical reference marks are positioned along the graduation, each reference mark allocated absolutely to the graduation. To determine the absolute value of a reference mark, two successive spacings between the two reference marks preceding in the measuring direction X are determined. The two spacings are determined by scanning the incremental graduation.
REFERENCES:
patent: 4519140 (1985-05-01), Schmitt
patent: 4529964 (1985-07-01), Minomi et al.
patent: 4602436 (1986-07-01), Ernst
patent: 4606642 (1986-08-01), Nelle
patent: 4654527 (1987-03-01), Schmitt
patent: 4701615 (1987-10-01), Schmitt
Oberhans Johann
Reimar Wolfgang
Dr. Johannes Heidenhain GmbH
Martin, Jr. William D.
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