Geometrical instruments – Area integrators – Electrical
Patent
1983-01-04
1985-01-01
Little, Willis
Geometrical instruments
Area integrators
Electrical
33125A, 33125C, 356374, G01B 1102
Patent
active
044909144
ABSTRACT:
An error correction system for correcting machine errors or division errors in a position measuring instrument for precision machines is disclosed. The system is usable, for example, in conjunction with instruments for measuring the relative position of two objects, wherein an incremental grid division formed on a measuring scale is scanned by a scanning unit to generate analog measurement signals. According to this invention, the scale defines additional correction tracks which extend along the scale, parallel to the division, and are scanned by additional scanning elements included in the scanning unit. These additional scanning elements operate to generate analog correction signals from the correction track. These analog correction signals are used to correct the analog measurement signals with respect to errors such as amplitude errors, phase angle errors, and zero crossing errors.
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patent: 4143267 (1979-03-01), Johnson et al.
patent: 4170828 (1979-10-01), Ernst
patent: 4225931 (1978-06-01), Schwefel
patent: 4262423 (1979-05-01), Affa
patent: 4363964 (1982-12-01), Schmitt
patent: 4385836 (1983-05-01), Schmitt
patent: 4400890 (1983-08-01), Ohkubo et al.
patent: 4403859 (1983-09-01), Ernst
Dr. Johannes Heidenhain GmbH
Little Willis
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