Position measuring apparatus with reference marks

Details Position measuring apparatus with reference marks Position measuring apparatus with reference marks

1990-05-02

1991-03-12

Shoop, Jr., William M.

Coded data generation or conversion

Digital pattern reading type converter

Optical

341 11, 250237G, H03M 122, H03M 130

Patent

active

049996231

ABSTRACT:
A position measuring apparatus of the type that includes a measuring scale and a scanning unit is provided. The measuring scale includes a measuring graduation track and a reference mark track associated with the measuring graduation track. The reference mark track includes a plurality of reference marks, a predetermined number of which are further designated as marked or unmarked. The scanning unit provides for scanning the measuring scale and evaluating the signal produced by such scanning. The apparatus also includes an operating switch associated with the scanning unit. The operating switch provides for selection of at least two modes of operation of the scanning unit: a first mode in which all the reference marks on the reference mark track are evaluated, and a second mode in which marked or unmarked reference marks on the reference track are evaluated.

REFERENCES:
patent: 3982106 (1976-09-01), Stutz
patent: 4101764 (1978-07-01), Nelle
patent: 4117320 (1978-09-01), Tomlinson et al.
patent: 4330831 (1982-05-01), Schwefel
patent: 4363964 (1982-12-01), Schmitt
patent: 4423958 (1984-01-01), Schmitt
patent: 4459750 (1984-07-01), Affa
patent: 4462159 (1984-07-01), Nelle
patent: 4479716 (1984-10-01), Nelle
patent: 4491928 (1985-01-01), Reichl
patent: 4519140 (1985-05-01), Schmitt

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