Position measuring device with a scanned absolute scale

Details Position measuring device with a scanned absolute scale Position measuring device with a scanned absolute scale

1985-07-25

1987-10-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 340347P, G01D 534

Patent

active

047000627

ABSTRACT:
A measuring instrument for determining the absolute angular position of two rotatable objects. The instrument comprises a housing which encapsulates a first information carrier with an incremental scale, a second information carrier with a absolute scale, a revolution reduction unit mechanically connecting the second carrier to the first carrier and a scanning element for scanning the first and second information carriers. The angle of rotation is determined within 360.degree. by means of the incremental scale and the number of revolutions of the first information carrier is absolutely determined within the range of i.times.360.degree. from the absolute scale, wherein i represents the ratio of the revolution reduction unit.

REFERENCES:
patent: 3525094 (1970-08-01), Leonard
patent: 3693024 (1972-09-01), Hulle et al.
patent: 4266125 (1981-05-01), Epstein et al.
patent: 4319134 (1972-03-01), Weber
patent: 4342996 (1982-08-01), Jannotta
patent: 4358753 (1982-11-01), Cascini
patent: 4572951 (1986-02-01), Toda et al.

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