Reference mark selection system for measuring apparatus

Details Reference mark selection system for measuring apparatus Reference mark selection system for measuring apparatus

1983-11-30

1984-07-31

Little, Willis

Geometrical instruments

Area integrators

Electrical

33125A, 356374, 250237G, H01J 314

Patent

active

044621590

ABSTRACT:
A measuring system is described which includes a scale which defines both a measuring graduation and an array of reference marks positioned at predetermined positions with respect to the measuring graduation. The measuring system also includes a scanning unit which generates reference signals in response to detection of the reference mark. In the disclosed system a track is provided on the measuring scale which records selection indicators electrically. These selection indicators are scanned via an element of the scanning unit in order to allow selected ones of the reference marks to go into operation. Preferably, the scanning unit includes a record head for magnetically recording the selection indicators on the track, an erase head for magnetically erasing the selection indicators on the track, and a read head for magnetically detecting the selection indicators.

REFERENCES:
patent: 4143267 (1979-03-01), Johnson et al.
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

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