Geometrical instruments – Area integrators – Electrical
Patent
1982-10-28
1985-05-28
Stearns, Richard R.
Geometrical instruments
Area integrators
Electrical
250237G, G01B 1102
Patent
active
045191409
ABSTRACT:
An incremental path measuring instrument is disclosed which includes a plurality of reference marks R.sub.1 . . . R.sub.n which are interposed between respective code marks C.sub.1 . . . C.sub.n. The reference marks and code marks are applied alternately and serially to the reference track included on the measuring scale. A scanning unit is included in the measuring device for scanning in series the reference marks and the code marks. Each of the code marks is unique, and only one of the two adjacent code marks and the respective reference mark must be scanned by the scanning unit in order to identify the reference mark unambiguously. When absolute position values are allocated to respective individual reference marks, the incremental path measuring device can operate in a quasi-absolute mode of operation, since then the position of each of the reference marks is established with respect to a predetermined zero point. Preferably, the code marks each contain beginning of block and end of block symbols in addition to the identifying information needed to identify the respective reference marks. The disclosed path measuring device includes an evaluation circuit which includes a circuit which automatically adapts the trigger threshold required for signal evaluation to the actual amplitudes of the signals.
REFERENCES:
patent: 3676652 (1972-07-01), Millis, Jr. et al.
patent: 3838251 (1974-09-01), Herrin
patent: 3882301 (1975-05-01), Nassimbene
patent: 3982106 (1976-09-01), Stutz
patent: 4044227 (1977-08-01), Holm et al.
patent: 4086478 (1978-04-01), Okono
patent: 4101764 (1978-07-01), Nelle
patent: 4158509 (1979-06-01), Rieder 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
Ein Neuartiges Abtastverfahren fur Codemassstabe, by Dr. Ing. Hans Walcher, from Elektronic 1972, Heft, 5, pp. 151-154.
Dr. Johannes Heidenhain GmbH
Stearns Richard R.
LandOfFree
System for identifying reference marks in a path measuring devic does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System for identifying reference marks in a path measuring devic, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for identifying reference marks in a path measuring devic will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-862042